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: June 09, 2025 at 20:06 UTC

Overall statistics

Found 1544 open PRs overall. Among these PRs

297 (19.2%) are awaiting review (these ones), among these 39 (13.0%) by new contributors (these ones)
264 (17.1%) are blocked on another PR
109 (7.1%) are awaiting the PR author's action
199 (12.9%) have a merge conflict: among these, 81 (40.7%) would be ready for review otherwise: these
39 (2.5%) are labelled help-wanted or please-adopt (roughly these)
604 (39.1%) are marked as draft or work in progress
11 (0.7%) are awaiting the outcome of a zulip discussion (these ones)
7 (0.5%) are opened from a fork of mathlib (these ones)
0 (0.0%) have contradictory labels (these ones)
13 (0.8%) are delegated (stale ones are here)
1 (0.1%) have been sent to bors (stale ones are here)

Approved, not yet landed PRs

At the moment,

1 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
24480	mariainesdff author:mariainesdff	feat(RingTheory/DividedPowers/SubPDIdeal): add SubDPIdeal	Let `A` be a commutative (semi)ring and let `I` be an ideal of `A` with a divided power structure `hI`. A subideal `J` of `I` is a sub-dp-ideal of `(I, hI)` if, for all `n ∈ ℕ > 0` and all `x ∈ J`, `hI.dpow n x ∈ J`. The "TODOs" listed on the file docstring have been formalized by the authors and will be added in subsequent PRs. Co-authored-by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory ready-to-merge delegated label:t-algebra$	373/0	Mathlib.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/RingTheory/Ideal/Span.lean	3	20	['AntoineChambert-Loir', 'github-actions', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	6-35277 6 days ago	6-36888 6 days ago	33-65896 33 days

17 PRs are waiting on maintainer approval (these), of which 16 have not been updated in a day (these)

22 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
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	150-14048 4 months ago	150-14048 4 months ago	34-82472 34 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	52-14897 1 month ago	67-13701 2 months ago	0-5717 1 hour
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 delegated	15/0	Mathlib/Analysis/Normed/Module/FiniteDimension.lean	1	3	['github-actions', 'mathlib-bors', 'urkud']	nobody	42-55626 1 month ago	42-55627 1 month ago	26-70139 26 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 delegated label:t-algebra$	5/3	Mathlib/RingTheory/Derivation/Basic.lean	1	8	['github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	31-78563 1 month ago	31-78563 1 month ago	47-39026 47 days
23214	mattrobball author:mattrobball	perf(Module.LinearMap.Defs): deprioritize projections to parents for `SemilinearMapClass`	Trying to figure out if a given type has a `SemilinearMapClass` instance when all we want is an `AddHomClass` or a `MulActionSemiHomClass` can be quite expensive since there are multiple ways to crawl the algebraic hierarchy to generate `LinearMapClass` instances. If these fail, then they fail slowly. We deprioritize the projections from `SemilinearMapClass` to `AddHomClass` and `MulActionSemiHomClass` to make this one of the last choices. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	6/0	Mathlib/Algebra/Module/LinearMap/Defs.lean	1	6	['github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	31-78329 1 month ago	31-78329 1 month ago	47-32152 47 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 delegated	8/4	Mathlib/Dynamics/Flow.lean,Mathlib/Topology/Algebra/Monoid.lean	2	10	['github-actions', 'grunweg', 'j-loreaux', 'mathlib-bors']	nobody	30-80778 30 days ago	30-80778 30 days ago	34-32727 34 days
24439	mariainesdff author:mariainesdff	feat(Data/Nat/Factorial/NatCast): add natCast_factorial_of_isNilpotent	Co-authored-by: @AntoineChambert-Loir. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra delegated label:t-algebra$	32/2	Mathlib/Data/Nat/Factorial/NatCast.lean	1	3	['b-mehta', 'github-actions', 'mariainesdff']	ocfnash assignee:ocfnash	9-21321 9 days ago	41-27829 1 month ago	42-15186 42 days
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. --- - [x] depends on: #23386 - [x] depends on: #23962 - [x] depends on: #24107 - [x] depends on: #24117 - [x] depends on: #24167 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	449/4	Mathlib.lean,Mathlib/Algebra/Group/End.lean,Mathlib/GroupTheory/GroupAction/FixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean	6	29	['github-actions', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	6-35345 6 days ago	6-35345 6 days ago	13-15466 13 days
24480	mariainesdff author:mariainesdff	feat(RingTheory/DividedPowers/SubPDIdeal): add SubDPIdeal	Let `A` be a commutative (semi)ring and let `I` be an ideal of `A` with a divided power structure `hI`. A subideal `J` of `I` is a sub-dp-ideal of `(I, hI)` if, for all `n ∈ ℕ > 0` and all `x ∈ J`, `hI.dpow n x ∈ J`. The "TODOs" listed on the file docstring have been formalized by the authors and will be added in subsequent PRs. Co-authored-by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory ready-to-merge delegated label:t-algebra$	373/0	Mathlib.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/RingTheory/Ideal/Span.lean	3	20	['AntoineChambert-Loir', 'github-actions', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	6-35277 6 days ago	6-36888 6 days ago	33-65896 33 days
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 delegated	8/0	Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean	1	6	['ADedecker', 'eric-wieser', 'github-actions', 'j-loreaux', 'mathlib-bors']	nobody	5-28956 5 days ago	14-16303 14 days ago	0-18788 5 hours
25473	adomani author:adomani	feat(CI): check that Mathlib files have lean or md extension	Twice recently there have been files with an "intended" `.lean` extension in `Mathlib/`: * #24942, ending in `;lean`; * #25457, ending in `.Lean`. `mk_all` does not add these files to `Mathlib.lean`, since they do not end in `.lean` and this later causes problems. This CI step checks that all files in `Mathlib/` end with `.lean` or `.md`. See #25474 for a test where the new step [correctly fails](https://github.com/leanprover-community/mathlib4/actions/runs/15464097783/job/43532018379?pr=25474). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI delegated	10/0	.github/workflows/lint_and_suggest_pr.yml	1	10	['adomani', 'bryangingechen', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	4-25952 4 days ago	4-26842 4 days ago	0-11212 3 hours
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	8	['github-actions', 'grunweg', 'mathlib-bors', 'ocfnash']	nobody	3-43644 3 days ago	114-83977 3 months ago	15-25642 15 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	13	['adomani', 'b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	3-43553 3 days ago	87-17765 2 months ago	15-14325 15 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/)	new-contributor t-algebra delegated label:t-algebra$	213/0	Mathlib.lean,Mathlib/FieldTheory/Minpoly/ConjRootClass.lean,Mathlib/FieldTheory/Minpoly/IsConjRoot.lean	3	16	['LessnessRandomness', 'Vierkantor', 'alreadydone', 'github-actions', 'grunweg', 'mathlib-bors']	Vierkantor assignee:Vierkantor	3-43512 3 days ago	14-19065 14 days ago	94-8480 94 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	8	['eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors', 'urkud']	nobody	3-20874 3 days ago	77-76255 2 months ago	0-12104 3 hours
25501	eric-wieser author:eric-wieser	fix: eliminate metadata in linarith	Otherwise this interferes with the `answer()` elaborator from formal-conjectures. Diagnosed using #25500. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta delegated bug	7/1	Mathlib/Tactic/Linarith/Parsing.lean,MathlibTest/linarith.lean	2	8	['adomani', 'b-mehta', 'github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors']	nobody	1-85708 1 day ago	2-1462 2 days ago	1-78612 1 day
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	246-33959 8 months ago	248-57435 8 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	112-82253 3 months ago	113-27024 3 months ago	0-54729 15 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	66-20303 2 months ago	66-20303 2 months ago	0-214 3 minutes
17129	joneugster author:joneugster	feat(Tactic/Linter): add unicode linter for unicode variant-selectors	Unicode characters can be followed by one of the two "variant-selectors" `\FE0E` (text) or `\FE0F` (emoji). These appear to the user as a single unicode character and they might copy them by accident. For example `✅️` (`\u2705\uFE0F`), `✅` (`\u2705`) and `✅︎` (`\u2705\uFE0E`) are three variants of the "same" unicode character. The one without variant-selector might display as either emoji or not, depending on the user's device and font. Add unicode linter ensuring variant-selector only appear on specified characters and also ensuring these characters always have the correct variant selector to avoid confusions. Everything flagged by this linter can be fixed fully automatically with `lake exe lint-style --fix` or by commenting `bot fix style` on the PR. --- - tracking PR: #16215 ## Zulip discussions: - https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F - https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Lean.20specific.20font ## Related PRs: - leanprover/lean4#5015 added some emoji-variant selectors to Emojis used in `Lean` itself. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict delegated awaiting-author	245/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnicodeLinter.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CongrM.lean,Mathlib/Tactic/Widget/Conv.lean,Mathlib/Tactic/Widget/GCongr.lean,Mathlib/Topology/ContinuousMap/Weierstrass.lean,MathlibTest/LintStyleTextBased.lean	11	25	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant']	nobody	24-14325 24 days ago	24-14327 24 days ago	82-54712 82 days
24409	urkud author:urkud	chore(*): fix `nmem` vs `not_mem` names	--- There are some missing/buggy deprecations, I'm going to fix them later today or tomorrow. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip tech debt merge-conflict delegated awaiting-author	317/176	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/Group/Indicator.lean,Mathlib/Algebra/Group/Support.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Order/Group/Indicator.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Support.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/Rademacher.lean,Mathlib/Analysis/Complex/RemovableSingularity.lean,Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Analysis/Convex/Cone/Proper.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Distribution/AEEqOfIntegralContDiff.lean,Mathlib/Data/LocallyFinsupp.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Dynamics/Ergodic/Conservative.lean,Mathlib/Dynamics/Ergodic/Ergodic.lean,Mathlib/Dynamics/Ergodic/Function.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/FreeModule/PID.lean,Mathlib/LinearAlgebra/PID.lean,Mathlib/LinearAlgebra/RootSystem/Base.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Lemmas.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSpace/Indicator.lean,Mathlib/MeasureTheory/Integral/Average.lean,Mathlib/MeasureTheory/Integral/Bochner/Set.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Basic.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean,Mathlib/MeasureTheory/Measure/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Measure/AddContent.lean,Mathlib/MeasureTheory/Measure/DiracProba.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean,Mathlib/MeasureTheory/OuterMeasure/AE.lean,Mathlib/MeasureTheory/SetSemiring.lean,Mathlib/Order/Filter/AtTopBot/CountablyGenerated.lean,Mathlib/Order/Filter/Cocardinal.lean,Mathlib/Order/Filter/Cofinite.lean,Mathlib/Order/Filter/Tendsto.lean,Mathlib/Order/Filter/Ultrafilter/Basic.lean,Mathlib/Probability/Distributions/Uniform.lean,Mathlib/Probability/Kernel/Basic.lean,Mathlib/Probability/Kernel/Composition/MeasureCompProd.lean,Mathlib/RingTheory/AdicCompletion/LocalRing.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/NewtonIdentities.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/Spectrum/Maximal/Localization.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/Topology/Algebra/InfiniteSum/Group.lean,Mathlib/Topology/Algebra/Module/Cardinality.lean,Mathlib/Topology/Algebra/Support.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/ContinuousMap/BoundedCompactlySupported.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/UrysohnsLemma.lean	77	4	['b-mehta', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib-bors']	nobody	7-49043 7 days ago	7-49043 7 days ago	0-55045 15 hours
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 merge-conflict delegated	20/8	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml	4	6	['adomani', 'github-actions', 'grunweg', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib-bors']	nobody	3-59146 3 days ago	3-59148 3 days ago	7-42070 7 days

Review status

There are currently 301 PRs awaiting review. Among these,

7 are labelled easy (these ones),
5 are addressing technical debt (namely these), and
96 appeared on the review queue within the last two weeks.

On the other hand, 142 PRs are unassigned and have not seen a status change in a week, and 49 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
24218	alreadydone author:alreadydone	chore(Algebra): remove `mid_assoc` from `IsMulCentral`	as it is a consequence of left and right associativity in the presence of commutativity. Also change the commutativity condition to use `Commute`. --- Even without commutativity, left and right associativity of an element `e` in a magma is sufficient to prove that elements of the form `e * x * e` (the "corner" of `e`) form a submagma. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	31/69	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Group/Center.lean,Mathlib/Algebra/GroupWithZero/Center.lean,Mathlib/Algebra/Ring/Center.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Algebra/Star/Center.lean,Mathlib/Algebra/Star/CentroidHom.lean,Mathlib/GroupTheory/Submonoid/Center.lean,Mathlib/LinearAlgebra/Basis/Submodule.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/RingTheory/Idempotents.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean	12	8	['alreadydone', 'github-actions', 'mans0954']	nobody	1	50-12169 1 month ago	50-27229 1 month ago	50-27219 50 days
24394	wwylele author:wwylele	feat(Analysis/Asymptotics): Add filter operation theorems to `IsEquivalent`	These are simply restating the corresponding theorems for `isLittleO`, but adding them provides better discovery when one is not familiar with how `IsEquivalent` is defined. I tagged `isEquivalent_map` as `@[simp]` because all of `isBigOWith/isBigO/isLittleO_map` are tagged, but I am not sure if this appropriate. Please let me know if I should remove the tag --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	13/0	Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean	1	1	['github-actions']	nobody	none	44-3314 1 month ago	44-3314 1 month ago	44-3373 44 days
24405	mcdoll author:mcdoll	refactor(Topology/Algebra/Module/WeakDual): Clean up	- Move `Dual` and `dualPairing` lower in the import-hierachy - deduplicate `dualPairing` - Make `WeakDual` and `WeakSpace` reducible --- New version of #11500 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology	146/162	Mathlib.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Analysis/VonNeumannAlgebra/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/Topology/Algebra/Module/Dual.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,docs/overview.yaml,docs/undergrad.yaml	14	1	['github-actions']	nobody	none	42-65841 1 month ago	42-74534 1 month ago	42-74517 42 days
24266	plp127 author:plp127	feat(Order): `NoBotOrder α` implies `NoMinOrder α` under `IsDirected α (· ≥ ·)`	Proves that `NoBotOrder α` implies `NoMinOrder α` under `IsDirected α (· ≥ ·)`, and also the dual theorem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	14/0	Mathlib/Order/Directed.lean	1	4	['github-actions', 'plp127', 'urkud']	nobody	none	37-63061 1 month ago	48-74442 1 month ago	48-74426 48 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/)	t-topology	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	37-46198 1 month ago	37-46198 1 month ago	70-25921 70 days
23360	kim-em author:kim-em	chore: review of `erw` in `Algebra/Homology/DerivedCategory`		t-algebra label:t-algebra$	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	37-46186 1 month ago	37-46186 1 month ago	74-57653 74 days
24527	matthewjasper author:matthewjasper	feat(Topology/Algebra/Module): Add more theorems for IsModuleTopology	Add theorems that surjective linear maps to the module topology are open. Add IsModuleTopology instance for quotients. Add IsModuleTopology instance for finite dimensional T2 vector spaces over a complete normed field and use it to shorten some proofs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra t-topology label:t-algebra$	48/24	Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/ModuleTopology.lean	2	5	['erdOne', 'github-actions', 'matthewjasper']	nobody	none	37-13321 1 month ago	37-30391 1 month ago	38-85090 38 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$	299/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	2	['Thmoas-Guan', 'github-actions']	nobody	none	36-59820 1 month ago	105-61462 3 months ago	105-61587 105 days
24361	Hagb author:Hagb	feat(Data/Finsupp/MonomialOrder): `0 ≤ a` where `a : m.syn`	`simp` would be able to solve it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor easy	3/0	Mathlib/Data/Finsupp/MonomialOrder.lean	1	1	['github-actions']	nobody	none	33-42488 1 month ago	33-42488 1 month ago	45-44165 45 days
24711	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/Limits): miscellany about preservation of (co)limits by tensor products	Register some instances regarding preservations of (co)limits for the tensor product of a monoidal category. More precisely, we register the fact that if the category is braided and `tensorLeft c` preserves colimits (this can be inferred e.g via `MonoidalClosed C`), then so does `tensorRight c` for every `c`. We also rephrase preservation of (co)limits for `curriedTensor C` in terms of preservations of (co)limits for `tensorRight c`. The PR introduces also introduces a directory `CategoryTheory.Monoidal.Limits` and moves the existing file `CategoryTheory.Monoidal.Limits.lean` to `CategoryTheory.Monoidal.Limits.Basic`. --- The instances registered here are tailored so that for a braided monoidal closed category, `PreservesColimit₂` instances from #24685 can be inferred with the results of #24686 for the external product of diagrams defined in #24703 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-category-theory	72/2	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Internal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Limits/Basic.lean,Mathlib/CategoryTheory/Monoidal/Limits/Preserves.lean	4	8	['github-actions', 'joelriou', 'robin-carlier']	nobody	none	30-34702 30 days ago	30-34702 30 days ago	31-17992 31 days
24351	eric-wieser author:eric-wieser	feat: fderiv lemmas for `pow`	This generalizes the lemmas about `fderiv fun x => f x ^ n` to work over arbitrary normed modules and algebras. Following the convention set by the lemmas about `fderiv` and `*`, we use `'`d names for the non-commutative variants. Moves: - `deriv_pow''` -> `deriv_pow` - `deriv_pow` -> `deriv_pow_field` - `derivWithin_pow'` -> `derivWithin_pow_field'` Deletions: - `deriv_pow'` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	282/82	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Polynomial.lean,Mathlib/Analysis/Calculus/Deriv/Pow.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Pow.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Complex/Angle.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/NumberTheory/ModularForms/JacobiTheta/TwoVariable.lean	9	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	none	29-68522 29 days ago	29-68522 29 days ago	30-15569 30 days
22966	alreadydone author:alreadydone	feat(RingTheory): degree 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 label:t-algebra$	272/49	Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Algebraic/Basic.lean,Mathlib/RingTheory/Algebraic/Integral.lean,Mathlib/RingTheory/AlgebraicIndependent/AlgebraicClosure.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	6	11	['Louddy', 'alreadydone', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	none	29-64005 29 days ago	29-64974 29 days ago	47-35835 47 days
24602	xyzw12345 author:xyzw12345	feat(LinearAlgebra/SymmetricAlgebra): IsSymmetricAlgebra	This PR is a part of #21539, which separates out the part about `IsSymmetricAlgebra`. Co-authored-by: Raphael Douglas Giles @Raph-DG Co-authored-by: Zhixuan Dai <22300180006@m.fudan.edu.cn> Co-authored-by: Zhenyan Fu Co-authored-by: Yiming Fu - [ ] depends on: #21539 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	78/0	Mathlib/LinearAlgebra/SymmetricAlgebra/Basic.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basis.lean	2	5	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	none	29-11986 29 days ago	29-12238 29 days ago	29-14179 29 days
23238	YaelDillies author:YaelDillies	feat: extended floor and ceil	My motivation for this is to prove `ENat.toENNReal (⨆ i, f i) = ⨆ i, ENat.toENNReal (f i)` and `ENat.toENNReal (⨅ i, f i) = ⨅ i, ENat.toENNReal (f i)`. Kalle Kytölä independently needs this for his formalisation of statistical physics. From MiscYD --- - [x] depends on: #24781 - [x] depends on: #24782 See #15269 for a past attempt. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	235/0	Mathlib.lean,Mathlib/Algebra/Order/Floor/Extended.lean	2	24	['YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'kkytola', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	none	29-1394 29 days ago	29-7345 29 days ago	76-59566 76 days
22662	plp127 author:plp127	feat: Localization.Away.lift (computably)	This PR adds `Localization.Away.lift'` and `Localization.Away.lift`, computable alternatives to `Localization.awayLift`. --- - [x] depends on: #24791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	74/0	Mathlib/RingTheory/Localization/Away/Basic.lean	1	11	['eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'plp127', 'vihdzp']	nobody	none	28-72193 28 days ago	28-73125 28 days ago	94-73110 94 days
24184	YaelDillies author:YaelDillies	feat: `[G : H]` notation for the index of `H : Subgroup G`	This is a cute notation which I wrote for FLT. Not sure whether we want it in mathlib nor how to include `relindex` in the picture. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC label:t-algebra$	5/0	Mathlib/GroupTheory/Index.lean	1	7	['YaelDillies', 'erdOne', 'github-actions', 'j-loreaux', 'kbuzzard']	nobody	none	28-57787 28 days ago	28-57787 28 days ago	51-81907 51 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	137/11	Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,scripts/noshake.json	5	7	['github-actions', 'j-loreaux', 'vasnesterov']	nobody	none	28-7043 28 days ago	30-14317 30 days ago	95-9992 95 days
23497	chrisflav author:chrisflav	chore(RingTheory/AdicCompletion/AsTensorProduct): golf using five lemma for modules	--- - [x] depends on: #23496 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	30/81	Mathlib/RingTheory/AdicCompletion/AsTensorProduct.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	none	27-75525 27 days ago	48-33482 1 month ago	48-34307 48 days
24829	urkud author:urkud	fix(Topology/Homotopy): fix name&args order of `comp`	`ContinuousMap.Homotopy.hcomp` used name & arguments order that matches Mathlib's category theory conventions, not topology conventions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	30/19	Mathlib/Topology/Homotopy/Basic.lean,Mathlib/Topology/Homotopy/Contractible.lean,Mathlib/Topology/Homotopy/Equiv.lean,Mathlib/Topology/Homotopy/Lifting.lean	4	5	['github-actions', 'grunweg', 'urkud']	nobody	none	27-47902 27 days ago	27-56542 27 days ago	27-56596 27 days
24752	MichaelStollBayreuth author:MichaelStollBayreuth	perf(Data.Real.Sqrt): make Real.sqrt irreducible	We try to see what happens if we make `Real.sqrt` irreducible. There are cases where this makes unification very significantly faster, compare [#mathlib4 > Coercion triggers timeout @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Coercion.20triggers.20timeout/near/517177117). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	1/0	Mathlib/Data/Real/Sqrt.lean	1	18	['MichaelStollBayreuth', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	none	27-3829 27 days ago	29-17151 29 days ago	29-22628 29 days
24870	smmercuri author:smmercuri	feat: `Field`, `FiniteDimensional` and `Algebra.IsSeparable` instances for `WithAbs`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis	14/1	Mathlib/Analysis/Normed/Field/WithAbs.lean	1	1	['github-actions']	nobody	none	26-49284 26 days ago	26-49291 26 days ago	26-49435 26 days
24872	smmercuri author:smmercuri	feat: `apply` and `coe` results for `UniformSpace.Completion.mapRingHom`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	9/0	Mathlib/Topology/Algebra/UniformRing.lean	1	1	['github-actions']	nobody	none	26-49063 26 days ago	26-49063 26 days ago	26-49111 26 days
24873	smmercuri author:smmercuri	feat: `Subtype.map_ne`	The restrictions to subtypes of two functions that never agree, also never agree. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	7/0	Mathlib/Data/Subtype.lean	1	1	['github-actions']	nobody	none	26-48723 26 days ago	26-48725 26 days ago	26-48774 26 days
24883	madvorak author:madvorak	chore(Data/Matrix): `Matrix.submatrix` naming convention	I'm suggesting this change for the following reasons: (1) managing expectations — `r_reindex` looks more like a propositional argument at first glance (2) the original naming does not do justice to its motivation — there is nothing called `r` and `c` here — it would need to be `row_reindex` and `col_reindex` or something like that (if we wanted to use the convention for naming constants even tho we are naming a variable here) --- Old version: https://github.com/leanprover-community/mathlib4/pull/24135	t-data	11/11	Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Defs.lean	2	1	['github-actions']	nobody	none	26-45358 26 days ago	26-45358 26 days ago	26-45348 26 days
24892	Ruben-VandeVelde author:Ruben-VandeVelde	fix: add missing simps projections for ContinuousAddEquiv	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	1/0	Mathlib/Topology/Algebra/ContinuousMonoidHom.lean	1	1	['github-actions']	nobody	none	26-36685 26 days ago	26-36687 26 days ago	26-36736 26 days
24889	Kha author:Kha	chore: do not include cache requests in build benchmark			5/2	scripts/bench/temci-config.run.yml	1	4	['Kha', 'github-actions', 'leanprover-bot']	nobody	none	26-29277 26 days ago	26-39112 26 days ago	26-39095 26 days
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/)	t-algebra t-analysis t-number-theory label:t-algebra$	543/2	Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Analysis/AbsoluteValue/Equivalence.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean	5	1	['github-actions']	nobody	none	26-25905 26 days ago	26-43208 26 days ago	37-66790 37 days
24311	YaelDillies author:YaelDillies	chore: replace `Monoid.IsTorsionFree` with `IsMulTorsionFree`	From Toric --- - [x] depends on: #24312 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	63/29	Mathlib/Algebra/Group/Torsion.lean,Mathlib/Combinatorics/Additive/CauchyDavenport.lean,Mathlib/GroupTheory/Order/Min.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/Topology/Instances/ZMultiples.lean	5	5	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	none	26-24432 26 days ago	26-24432 26 days ago	26-37762 26 days
22043	YaelDillies author:YaelDillies	chore: shortcut instance for `Neg ℤˣ`	This lets us avoid importing `Ring` in downstream files (most of the effect is to come). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-algebra label:t-algebra$	20/47	Mathlib.lean,Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/Group/Int/Units.lean,Mathlib/Algebra/Order/Ring/Abs.lean,Mathlib/Algebra/Ring/Int/Units.lean,Mathlib/Algebra/Ring/NegOnePow.lean,Mathlib/Data/Fintype/Units.lean,Mathlib/Data/Int/AbsoluteValue.lean,Mathlib/Data/Int/Associated.lean,Mathlib/GroupTheory/HNNExtension.lean,Mathlib/NumberTheory/NumberField/Basic.lean,MathlibTest/Zify.lean	12	15	['YaelDillies', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors']	nobody	none	26-24175 26 days ago	26-24175 26 days ago	110-83611 110 days
24254	Louddy author:Louddy	feat: valuation on RatFunc which is trivial on constants	Given a valuation `v` on `RatFunc K` that is trivial on the constants `K`, the valuation on `RatFunc.X` determines to some degree the valuation on any `p : Polynomial K`. These are important in the context of Ostrowski's theorem for `RatFunc K`. Note that the condition that the valuation is trivial on constants is automatically fulfilled when `K` is finite. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	66/0	Mathlib/FieldTheory/RatFunc/AsPolynomial.lean	1	29	['Louddy', 'faenuccio', 'github-actions', 'mariainesdff']	nobody	none	25-33991 25 days ago	25-34043 25 days ago	27-34964 27 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	34/0	Mathlib/Data/Set/Lattice.lean,Mathlib/Data/Set/Pairwise/Lattice.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean	3	12	['github-actions', 'grunweg', 'j-loreaux', 'oeb25']	nobody	none	25-33393 25 days ago	25-34406 25 days ago	127-82912 127 days
24730	YaelDillies author:YaelDillies	feat(Bialgebra): group-like elements	Define group-like elements in a bialgebra, ie units `a` such that `Δ a = a ⊗ₜ a`. We prove that group-like elements always form a group, and are linearly independent if the base ring is a domain. From Toric Co-authored-by: Michał Mrugała --- - [x] depends on: #24747 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	167/0	Mathlib.lean,Mathlib/RingTheory/Bialgebra/GroupLike.lean	2	18	['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	none	25-15390 25 days ago	29-79464 29 days ago	29-81020 29 days
24891	YaelDillies author:YaelDillies	feat: `M ≃ₗ[R] (Fin (Module.finrank R M) → R)` for `M` a finite `R`-module	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	13/3	Mathlib/LinearAlgebra/Dimension/Free.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean,Mathlib/LinearAlgebra/FreeModule/Finite/Basic.lean	3	9	['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions']	nobody	none	25-11279 25 days ago	26-21110 26 days ago	26-38032 26 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$	453/45	Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean	1	57	['AntoineChambert-Loir', 'Louddy', 'github-actions', 'kbuzzard']	nobody	none	24-42459 24 days ago	26-39366 26 days ago	98-59896 98 days
24948	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): define `between` subgraphs	The simple graph `G.between s t` is the subgraph of `G` containing edges that connect a vertex in the set `s` to a vertex in the set `t`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	91/0	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean	1	1	['github-actions']	nobody	none	24-40626 24 days ago	24-40631 24 days ago	24-40679 24 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	65/48	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/Moments/Variance.lean,Mathlib/RingTheory/PowerBasis.lean,Mathlib/Topology/MetricSpace/Holder.lean,Mathlib/Topology/MetricSpace/HolderNorm.lean	14	20	['YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	none	23-44302 23 days ago	23-44323 23 days ago	73-36877 73 days
24967	vasnesterov author:vasnesterov	perf(Topology/Metrizable): lower `IsCompletelyMetrizableSpace.MetrizableSpace` priority	The priority of `IsCompletelyMetrizableSpace.MetrizableSpace` was set to 100, causing it to be applied before `EMetricSpace.metrizableSpace` and leading to wasted time trying to infer completeness. This PR sets it to 90. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology easy	1/1	Mathlib/Topology/Metrizable/CompletelyMetrizable.lean	1	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	none	23-30787 23 days ago	23-69878 23 days ago	23-71889 23 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	192/0	Mathlib.lean,Mathlib/CategoryTheory/Abelian/SerreClass/MorphismProperty.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean,Mathlib/CategoryTheory/Preadditive/Basic.lean	5	7	['TwoFX', 'erdOne', 'github-actions', 'joelriou']	nobody	none	23-22640 23 days ago	23-22640 23 days ago	81-8568 81 days
24533	robertmaxton42 author:robertmaxton42	feat (ULift): conjugation by ULift.up/down, misc cast/heq lemmas	* Adds the convenience def `ULift.conj x := `down (f (up x))`, and corresponding basic lemmas * Adds lemmas showing that `ULift.up` and `.down` commute with casts and preserve `HEq`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	31/0	Mathlib/Data/ULift.lean	1	14	['eric-wieser', 'github-actions', 'robertmaxton42']	nobody	none	22-38855 22 days ago	38-38495 1 month ago	38-46410 38 days
24191	joelriou author:joelriou	refactor(CategoryTheory): redefine triangulated subcategories using ObjectProperty	--- - [x] depends on: #22574 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	279/191	Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/CategoryTheory/ObjectProperty/ContainsZero.lean,Mathlib/CategoryTheory/ObjectProperty/Shift.lean,Mathlib/CategoryTheory/Triangulated/HomologicalFunctor.lean,Mathlib/CategoryTheory/Triangulated/Subcategory.lean	5	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	none	22-30674 22 days ago	28-3496 28 days ago	46-67686 46 days
24960	linesthatinterlace author:linesthatinterlace	feat(Data/Finite/PermOf): Add an array-based implementation of finite permutations, `PermOf`.	Implements `PermOf`, an array-based implementation of finite permutations/ --- As part of my PhD, I created this implementation. I have more to add to it, but I'm making this relatively small initial commit to exhibit the core definitions before I start building anything elaborate. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	378/0	Mathlib.lean,Mathlib/Data/Finite/PermLT/Defs.lean,Mathlib/Data/Finite/PermLT/Group.lean,Mathlib/Data/Finite/PermLT/MulAction.lean	4	35	['eric-wieser', 'github-actions', 'linesthatinterlace']	nobody	none	22-7695 22 days ago	24-19913 24 days ago	24-19968 24 days
24966	michaellee94 author:michaellee94	feat(Manifold/PartitionOfUnity): Existence of global C^n smooth section for nontrivial bundles	Add existence of global C^n smooth section for nontrivial bundles --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-differential-geometry	154/13	Mathlib/Geometry/Manifold/PartitionOfUnity.lean	1	3	['github-actions', 'grunweg', 'michaellee94']	nobody	none	21-79963 21 days ago	23-17943 23 days ago	23-45496 23 days
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 label:t-algebra$	253/71	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Instances.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/IntegralClosure/IntegralRestrict.lean,Mathlib/RingTheory/Localization/AtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/LocalizationLocalization.lean,Mathlib/RingTheory/RingHom/Finite.lean,Mathlib/RingTheory/Trace/Quotient.lean	11	34	['YaelDillies', 'erdOne', 'fpvandoorn', 'github-actions', 'riccardobrasca']	nobody	none	21-26828 21 days ago	26-26297 26 days ago	92-58869 92 days
24719	madvorak author:madvorak	feat(LinearAlgebra/Matrix/NonsingularInverse): inverting `Matrix` inverts its `LinearEquiv`	--- Discussion: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2324719.20cannot.20find.20home/with/517142655	t-algebra label:t-algebra$	10/0	Mathlib/LinearAlgebra/Matrix/NonsingularInverse.lean	1	11	['eric-wieser', 'github-actions', 'madvorak']	nobody	none	21-20152 21 days ago	29-24997 29 days ago	30-61226 30 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 --- - [x] depends on: #22299 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	27/0	Mathlib/RingTheory/Ideal/GoingDown.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	none	21-9651 21 days ago	21-9775 21 days ago	21-13240 21 days
25036	Parcly-Taxel author:Parcly-Taxel	feat: IMO 2001 Q4		IMO	131/4	Archive.lean,Archive/Imo/Imo2001Q4.lean,Mathlib/Logic/Equiv/Fin/Rotate.lean	3	1	['github-actions']	nobody	none	20-51766 20 days ago	20-52508 20 days ago	20-52492 20 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$	215/155	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/RingTheory/Extension/Basic.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	7	['alreadydone', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	none	20-38962 20 days ago	20-39117 20 days ago	97-8246 97 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. --- - [x] depends on: #20071 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	69/0	Mathlib/Data/Seq/Seq.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	none	20-37866 20 days ago	27-81161 27 days ago	27-81310 27 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 --- - [x] depends on: #24071 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	155/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	17	['AntoineChambert-Loir', 'Thmoas-Guan', 'eric-wieser', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	none	20-35308 20 days ago	20-35328 20 days ago	94-79909 94 days
25044	alreadydone author:alreadydone	feat(Topology/Algebra): `Homeomorph` version of `unitsEquivNeZero`	also add `Topology.IsEmbedding.homeomorphImage`: a set is homeomorphic to its image under any embedding. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology label:t-algebra$	51/28	Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Homeomorph/Lemmas.lean	2	1	['github-actions']	nobody	none	20-28054 20 days ago	20-32309 20 days ago	20-32293 20 days
25042	alreadydone author:alreadydone	feat(Topology): restriction/extension of Trivialization and composition with Homeomorph	--- - [x] depends on: #25041 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	148/2	Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Maps/Basic.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	none	20-10483 20 days ago	20-18238 20 days ago	20-19618 20 days
24928	kim-em author:kim-em	chore: remove some `Nat` shortcut instances		t-data	0/9	Mathlib/Algebra/Ring/Divisibility/Basic.lean,Mathlib/Data/List/TakeDrop.lean,Mathlib/Data/Nat/Basic.lean	3	10	['Ruben-VandeVelde', 'github-actions', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	none	19-67618 19 days ago	19-67618 19 days ago	25-43867 25 days
25068	Parcly-Taxel author:Parcly-Taxel	feat: IMO 2001 Q3		IMO	111/0	Archive.lean,Archive/Imo/Imo2001Q3.lean	2	1	['github-actions']	nobody	none	19-64371 19 days ago	19-67128 19 days ago	19-67112 19 days
24931	qawbecrdtey author:qawbecrdtey	feat(Data/Nat/Sqrt): Added lemma `Nat.add_one_sqrt_le_of_pos`	--- This commit proves a single lemma `Nat.add_one_sqrt_le_of_pos`. ```lean lemma add_one_sqrt_le_of_pos {n : ℕ} (hn : 1 ≤ n) : (n + 1).sqrt ≤ n ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data easy	7/0	Mathlib/Data/Nat/Sqrt.lean	1	4	['Ruben-VandeVelde', 'eric-wieser', 'github-actions', 'qawbecrdtey']	nobody	none	19-23003 19 days ago	25-37853 25 days ago	25-37911 25 days
24703	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal): external product of diagrams in monoidal categories	Given functors `K₁ : J₁ ⥤ C` and `K₂ : J₂ ⥤ C` with values in a monoidal category, define a construction `externalProduct K₁ K₂` (denoted `K₁ ⊠ K₂`) as the bifunctor `(j₁, j₂) ↦ K₁ j₁ ⊗ K₂ j₂`. We show that composition of this construction with the diagonal functor to the product recovers the pointwise tensor product of functors, and we show that this construction satisfies a symmetry whenever `C` is braided. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	99/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct.lean	2	5	['github-actions', 'joelriou']	nobody	none	18-47098 18 days ago	18-47161 18 days ago	31-2826 31 days
25101	erdOne author:erdOne	feat(AlgebraicGeometry): building morphisms into Proj	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	231/3	Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Basic.lean,Mathlib/AlgebraicGeometry/Restrict.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean	4	6	['erdOne', 'github-actions', 'joelriou']	nobody	none	17-78571 17 days ago	17-78571 17 days ago	18-58260 18 days
25123	eric-wieser author:eric-wieser	feat: add rfl lemmas for monoidal categories	Making these `simp` opens a can of worms best left to #24823 `simps` would generate bad names here. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	111/0	Mathlib/Algebra/Category/AlgCat/Monoidal.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/QuadraticModuleCat/Monoidal.lean	3	1	['github-actions']	nobody	none	17-68079 17 days ago	17-68079 17 days ago	17-68132 17 days
25124	Parcly-Taxel author:Parcly-Taxel	feat: number of edges in the Turán graph	We provide two theorems, the first `card_edgeFinset_turanGraph` providing the exact number of edges and the other `card_edgeFinset_turanGraph_le` providing a (slightly) looser bound whose main advantage is its lack of integer division/modulus operations. The bound in `card_edgeFinset_turanGraph_le` is also the bound provided in [Motzkin and Straus (1965)](https://doi.org/10.4153%2FCJM-1965-053-6).	large-import t-combinatorics	132/0	Mathlib/Combinatorics/SimpleGraph/Turan.lean,Mathlib/Data/Nat/ModEq.lean	2	1	['github-actions']	nobody	none	17-63123 17 days ago	17-65948 17 days ago	17-65991 17 days
24485	dagurtomas author:dagurtomas	feat(CategoryTheory): localization preserves braided structure	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	733/427	Mathlib.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal/Basic.lean,Mathlib/CategoryTheory/Localization/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean	6	7	['dagurtomas', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant']	nobody	none	17-41565 17 days ago	17-41565 17 days ago	27-82564 27 days
24651	Hagb author:Hagb	feat(RingTheory/Finiteness/Defs): span of a set is finitely generated iff generated by a finite subset	--- - [ ] depends on: #24648 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	14/0	Mathlib/RingTheory/Finiteness/Defs.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	none	17-38635 17 days ago	17-38654 17 days ago	17-43206 17 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	41	['JovanGerb', 'b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'vasnesterov']	nobody	none	17-36555 17 days ago	67-74040 2 months ago	73-14281 73 days
24528	chrisflav author:chrisflav	feat(AlgebraicGeometry): directed covers	Directed covers are covers, where every intersection can be covered by a component of the cover. For open covers this is equivalent to the images forming a basis of the topology. If a cover is directed, the compatibility conditions for gluing become easier, because only compatibility with the transition maps needs to be checked. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	233/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Cover/Directed.lean	2	6	['chrisflav', 'erdOne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant']	nobody	none	17-25545 17 days ago	17-25612 17 days ago	34-10636 34 days
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. --- - [x] depends on: #22933 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	126/119	Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/RingHom/Finite.lean,Mathlib/RingTheory/RingHom/FiniteType.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	none	17-23901 17 days ago	17-25275 17 days ago	17-26487 17 days
25112	linesthatinterlace author:linesthatinterlace	feat(`Algebra/Group/Prod`): Add API for inclusion and projection maps from and to the product of units.	Adds API for inclusion and projection maps from and to the product of units. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	99/30	Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Data/Nat/Totient.lean,Mathlib/Topology/Algebra/Group/Basic.lean	4	9	['eric-wieser', 'github-actions', 'linesthatinterlace', 'pechersky']	nobody	none	17-23021 17 days ago	18-25288 18 days ago	18-25451 18 days
25069	erdOne author:erdOne	feat(EllipticCurve): rational points of singular nodal cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	251/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Node.lean	3	11	['Multramate', 'acmepjz', 'erdOne', 'github-actions']	nobody	none	17-16885 17 days ago	19-63787 19 days ago	19-63844 19 days
25071	erdOne author:erdOne	feat(EllipticCurve): basic API for singular cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	320/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	3	34	['Multramate', 'acmepjz', 'erdOne', 'github-actions']	nobody	none	16-60121 16 days ago	19-61944 19 days ago	19-62000 19 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. --- - [x] depends on: #22882 - [x] depends on: #23063 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	70/3	Mathlib/GroupTheory/Index.lean,Mathlib/LinearAlgebra/FreeModule/Finite/Quotient.lean,Mathlib/NumberTheory/NumberField/Units/Regulator.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	none	16-25473 16 days ago	16-25491 16 days ago	16-26436 16 days
25150	robin-carlier author:robin-carlier	feat(CategoryTheory/Bicategory): (2,1)-categories and `Pith`	This PR introduces a class `IsLocallyGroupoid` on bicategories, asserting that every hom-category has an `IsGroupoid` instance. With this definition, `IsLocallyGroupoid (LocallyDiscrete C)` is correctly inferred. Given a bicategory `B`, we introduce a type alias `Pith B` for `B` (realized as a one-field structure), and we equip it with a `Bicategory` instance where the hom-categories are the cores of the hom-categories of `B`. We show that this bicategory is a (2,1)-category, construct an inclusion pseudo-functor from `Pith B` to `B`, and show that every pseudofunctor from a (2,1)-category to `B` factors through this inclusion. --- We can’t fully state the fact that `(pseudofunctorToPith F).comp (inclusion F)` "is" `F` because #18254 is still not merged. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	191/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/LocallyGroupoid.lean	2	1	['github-actions']	nobody	none	16-15580 16 days ago	16-19133 16 days ago	16-19188 16 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	5	['dagurtomas', 'gio256', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	none	15-86359 15 days ago	51-83505 1 month ago	90-28708 90 days
25157	wwylele author:wwylele	feat(Data/Real): add embedding of archimedean groups into Real	This is part of #25140, and is the special case of Hahn embedding theorem applied to archimedean group. The construction is rather unpleasant as it uses explicit Cauchy sequence with essentially the binary representation of numbers, but I haven't found a better way to do this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	288/0	Mathlib.lean,Mathlib/Data/Real/Embedding.lean	2	3	['eric-wieser', 'github-actions', 'wwylele']	nobody	none	15-74090 15 days ago	16-11777 16 days ago	16-11830 16 days
25105	erdOne author:erdOne	feat(AlgebraicGeometry): inverse limit of nonempty quasicompact closeds is nonempty	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebraic-geometry	92/2	Mathlib/AlgebraicGeometry/AffineTransitionLimit.lean,Mathlib/AlgebraicGeometry/Morphisms/Separated.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean	3	1	['github-actions']	nobody	none	15-64061 15 days ago	18-42130 18 days ago	18-42182 18 days
24819	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/MvPolynomial/Groebner): add docstring and a particular case	* add a new division theorem when one divides by a single polynomial * add docstrings to the three division theorems --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	27/3	Mathlib/RingTheory/MvPolynomial/Groebner.lean	1	4	['Hagb', 'github-actions']	nobody	none	15-12814 15 days ago	28-6092 28 days ago	28-6144 28 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$	239/0	Mathlib.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Category/Ring/Topology.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,scripts/noshake.json	7	21	['dagurtomas', 'erdOne', 'github-actions', 'kbuzzard']	nobody	none	15-7653 15 days ago	27-12564 27 days ago	109-40479 109 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	48/24	Mathlib/Topology/Separation/Regular.lean,Mathlib/Topology/UniformSpace/OfCompactT2.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	none	15-3140 15 days ago	15-3162 15 days ago	46-79521 46 days
25183	YaelDillies author:YaelDillies	feat: convolution product on linear maps from a coalgebra to an algebra	Construct the ring structure on linear maps `C → A` where `C` is a coalgebra and `A` an algebra, where multiplication is given by `(f * g)(x) = ∑ f x₍₁₎ * g x₍₂₎` in Sweedler notation or ``` \| μ \| \| / \ f * g = f g \| \| \ / δ \| ``` diagrammatically, where `μ` stands for multiplication and `δ` for comultiplication. [Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/.60Mul.60.20instance.20on.20algebra.20homomorphisms.20from.20monoid.20algebra) From Toric Co-authored-by: Michał Mrugała Co-authored-by: Yunzhou Xie --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	137/0	Mathlib.lean,Mathlib/RingTheory/Coalgebra/Convolution.lean	2	14	['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions']	nobody	none	15-2432 15 days ago	15-2493 15 days ago	15-6417 15 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$	104/0	Mathlib.lean,Mathlib/GroupTheory/FreeGroup/ReducedWords.lean	2	37	['b-reinke', 'github-actions', 'tb65536', 'vlad902']	nobody	2	14-59970 14 days ago	74-25781 2 months ago	74-33611 74 days
25188	vlad902 author:vlad902	feat: add lemmas about `List.scanr`	I add basic lemmas to reason about `List.scanr`, and slightly clean-up the file and add some basic lemmas to keep the API unified with the one for `List.scanl`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	84/18	Mathlib/Data/List/Scan.lean	1	5	['b-mehta', 'github-actions', 'vlad902']	nobody	1	14-48841 14 days ago	14-49069 14 days ago	14-72569 14 days
25204	YaelDillies author:YaelDillies	refactor: redefine `ProperCone` as an `abbrev` for `ClosedSubmodule`	... and derive the `ProperCone` operations from `ClosedSubmodule` too. Also rename the scalar ring from `𝕜` to `R`. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-analysis	79/90	Mathlib/Analysis/Convex/Cone/Proper.lean	1	1	['github-actions']	nobody	none	14-37093 14 days ago	14-37135 14 days ago	14-37146 14 days
25209	upobir author:upobir	feat(NumberTheory/Divisors): add int divisors	--- this PR adds `Int.divisors` analogous to `Nat.divisors`. Some preliminary results are proven for the new definition. Imports have also been modified by using `#min_imports` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	125/4	Mathlib/NumberTheory/Divisors.lean	1	8	['Paul-Lez', 'eric-wieser', 'github-actions', 'upobir']	nobody	none	14-18151 14 days ago	14-24775 14 days ago	14-24832 14 days
24050	Paul-Lez author:Paul-Lez	feat(Data/Finsupp/Pointwise): generalise pointwise scalar multiplication of finsupps	As pointed out by @eric-wieser, this creates an instance diamond with `SMul (α → β) (α →₀ (α → β))` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	7/4	Mathlib/Data/Finsupp/Pointwise.lean	1	6	['Paul-Lez', 'eric-wieser', 'github-actions']	nobody	none	14-10564 14 days ago	55-85262 1 month ago	55-85314 55 days
25070	erdOne author:erdOne	feat(EllipticCurve): rational points on singular cuspidal cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	123/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Cusp.lean	2	9	['Multramate', 'acmepjz', 'erdOne', 'github-actions', 'kckennylau']	nobody	none	14-1019 14 days ago	19-63820 19 days ago	19-63817 19 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. Co-authored-by: Aaron Liu --- The current draft displays the old code for comparison with new versions labeled ALT. After initial review this will be cut. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos t-topology t-category-theory	490/202	Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/EqToHom.lean	6	17	['emilyriehl', 'github-actions', 'joelriou']	nobody	none	13-65658 13 days ago	20-7827 20 days ago	26-75823 26 days
25182	YaelDillies author:YaelDillies	feat: `(M →* N₁) ≃* (M →* N₂)` if `N₁ ≃* N₂`	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	63/12	Mathlib/Algebra/Category/Grp/ForgetCorepresentable.lean,Mathlib/Algebra/Category/Grp/LargeColimits.lean,Mathlib/Algebra/Category/MonCat/ForgetCorepresentable.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/GroupTheory/FiniteAbelian/Duality.lean	5	10	['YaelDillies', 'eric-wieser', 'github-actions']	nobody	none	13-48712 13 days ago	14-41952 14 days ago	15-32593 15 days
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`. --- - [x] depends on: #21744 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology t-category-theory	253/7	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	1	21	['dagurtomas', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	none	13-47257 13 days ago	25-41685 25 days ago	48-49632 48 days
25240	IvanRenison author:IvanRenison	feat(Analysis/InnerProductSpace/Projection): add lemma `Submodule.le_iff_orthogonal_le_orthogonal` and similars	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	25/0	Mathlib/Analysis/InnerProductSpace/Projection.lean	1	1	['github-actions']	nobody	none	13-15930 13 days ago	13-15933 13 days ago	13-15986 13 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$	57/65	Mathlib/Algebra/Field/Equiv.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/GroupWithZero/Units/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	13	4	['alreadydone', 'github-actions', 'xroblot']	nobody	1	13-6805 13 days ago	65-72197 2 months ago	65-72217 65 days
25224	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): edgeSet of Eulerian walk equal to edgeSet of graph	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics easy	6/0	Mathlib/Combinatorics/SimpleGraph/Trails.lean	1	2	['IvanRenison', 'github-actions']	nobody	none	12-83709 12 days ago	13-74712 13 days ago	13-75614 13 days
25225	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): Eulerian walk in connected graph contains all vertices	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	16/0	Mathlib/Combinatorics/SimpleGraph/Trails.lean	1	3	['IvanRenison', 'github-actions']	nobody	none	12-83102 12 days ago	13-74514 13 days ago	13-74571 13 days
25248	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): Add Subgraph.inclusion_edge_apply_coe and inclusion_edgeSet_apply_coe	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	12/0	Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	1	1	['github-actions']	nobody	none	12-76744 12 days ago	12-76745 12 days ago	12-76800 12 days
25238	Hagb author:Hagb	feat(Tactic/ComputeDegree): add support for scalar multiplication with different types	It would be able to deal with `a • (X : R[X])` where `a : S` is in a different type `S` with `[SMulZeroClass S R]`. --- - [x] depends on: #25237 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	17/5	Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	none	12-56734 12 days ago	12-81177 12 days ago	12-83080 12 days
25153	eric-wieser author:eric-wieser	feat(Algebra/ModEq): a lemma about `[PMOD (n • p)]`	This ultimately didn't end up very useful to me, but I think it's still a nice result. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	20/0	Mathlib/Algebra/ModEq.lean	1	3	['YaelDillies', 'eric-wieser', 'github-actions']	nobody	none	12-48292 12 days ago	16-14031 16 days ago	16-14015 16 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	65/0	Mathlib.lean,Mathlib/Geometry/Convex/Polytope.lean,Mathlib/Geometry/Convex/README.md	3	7	['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	1	12-45087 12 days ago	12-45105 12 days ago	59-44919 59 days
25253	Ruben-VandeVelde author:Ruben-VandeVelde	feat: add AlgHom.natCard_of_splits	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		21/7	Mathlib/FieldTheory/PrimitiveElement.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/SetTheory/Cardinal/Finite.lean	3	1	['github-actions']	nobody	none	12-43025 12 days ago	12-43107 12 days ago	12-43091 12 days
24804	Moises-Herradon-Cueto author:Moises-Herradon-Cueto	feat(CategoryTheory/Limits/Preserves/Shapes): show that if a functor preserves limits, so does `Over.post`	If a functor `F` preserves limits (of a certain shape, finite, or of a certain size), then so does the induced functor on `Over` categories. From Toric Co-authored-by: Yaël Dillies --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric new-contributor t-category-theory	125/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Over.lean,Mathlib/CategoryTheory/WithTerminal/Basic.lean	3	17	['Moises-Herradon-Cueto', 'YaelDillies', 'erdOne', 'github-actions', 'joelriou']	nobody	none	12-42970 12 days ago	13-18912 13 days ago	19-23308 19 days
25179	YaelDillies author:YaelDillies	feat: `#track_sorry`, a command to find usage of `sorry`	`#track_sorry foo` returns a non-sorry-free declaration `bar` which `foo` depends on, if such `bar` exists. Such a command is a recurrent need of the community, see eg [here](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Hunting.20down.20axioms/with/495448595) most recently. From Toric Co-authored-by: Henrik Böving --- An alternative implementation was provided in [#Is there code for X? > ✔ Finding usages of `sorry` in external code @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/.E2.9C.94.20Finding.20usages.20of.20.60sorry.60.20in.20external.20code/near/430509619) by @kmill. I prefer the current one because it only prints something for uses of `sorry` and not the other three standard axioms. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-meta	71/0	Mathlib.lean,Mathlib/Util/TrackSorry.lean	2	11	['YaelDillies', 'eric-wieser', 'github-actions', 'kmill']	nobody	none	12-33079 12 days ago	15-41894 15 days ago	15-41948 15 days
25257	Hagb author:Hagb	feat(Mathlib/Algebra/Polynomial/Degree/Domain.lean): generalize `natDegree_smul` from `SMulWithZero` to `SMulZeroClass`	as suggested by @eric-wieser in https://github.com/leanprover-community/mathlib4/pull/25237#discussion_r2111599865 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	4/3	Mathlib/Algebra/Polynomial/Degree/Domain.lean	1	1	['github-actions']	nobody	none	12-26109 12 days ago	12-26109 12 days ago	12-26171 12 days
25262	Ruben-VandeVelde author:Ruben-VandeVelde	chore: add missing deprecations	From #23643, #23804, #24762, #24827, #24833, and #25016. --- Maybe for some of those there could be reasons to argue that a deprecation is not terribly useful, but adding them is so cheap that I don't think it's worth spending much time arguing about it. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		36/0	Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSqIntegral.lean,Mathlib/GroupTheory/Perm/Finite.lean,Mathlib/GroupTheory/Perm/Support.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/TotallyRealComplex.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/MvPowerSeries/PiTopology.lean	8	1	['github-actions']	nobody	none	12-15004 12 days ago	12-17260 12 days ago	12-17244 12 days
25251	YaelDillies author:YaelDillies	chore: move pointed cones, proper cones	Pointed cones too are a kind of algebraic cone. They therefore move to the new `Geometry.Convex.Cone` folder. In turn, this makes proper cones the primitive kind of topological/analytic cones, and therefore `Analysis.Convex.Cone.Proper` gets renamed to `Analysis.Convex.Cone.Basic`. The two sections about dual pointed cones and dual proper cones move to the existing `Analysis.Convex.Cone.InnerDual`. The READMEs about `Geometry.Convex.Cone` and `Analysis.Convex.Cone` get updated to reflect that the separation is non-topology vs topology, rather topology vs analysis. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed toric large-import t-analysis	112/115	Mathlib.lean,Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Analysis/Convex/Cone/Closure.lean,Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Analysis/Convex/Cone/README.md,Mathlib/Geometry/Convex/Cone/Basic.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean,Mathlib/Geometry/Convex/Cone/README.md	8	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	none	12-12573 12 days ago	12-20075 12 days ago	12-36173 12 days
25266	j-loreaux author:j-loreaux	feat: add path component of the identity in a locally path connected topological group, as an open normal subgroup	--- From [LeanOA](https://github.com/j-loreaux/LeanOA) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	101/8	Mathlib.lean,Mathlib/Topology/Connected/PathComponentOne.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Path.lean	4	1	['github-actions']	nobody	none	12-7869 12 days ago	12-10701 12 days ago	12-11347 12 days
25271	YaelDillies author:YaelDillies	feat: promote an `AlgEquiv` preserving `counit` and `comul` to a `BialgEquiv`	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	38/24	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean	3	1	['github-actions']	nobody	none	12-6409 12 days ago	12-10058 12 days ago	12-10053 12 days
25173	Timeroot author:Timeroot	"Junk value" test file	Add to MathlibTest a file that documents junk values of many functions, and explains some of their motivations and gotchas. --- Based on the conversation [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/Documenting.20lean.20pitfalls.3A.20feedback.20requested/near/520155520). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		362/2	Mathlib/Data/Nat/Find.lean,MathlibTest/Junk.lean	2	15	['Timeroot', 'github-actions', 'plp127']	nobody	none	11-84537 11 days ago	15-59398 15 days ago	15-59382 15 days
24582	pechersky author:pechersky	feat(GroupTheory/ArchimedeanDensely): Unique (ℤ ≃+o ℤ)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #24580	t-order t-algebra label:t-algebra$	44/0	Mathlib/Data/Int/Cast/Lemmas.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean	2	5	['eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'pechersky']	nobody	none	11-65302 11 days ago	11-65375 11 days ago	15-28500 15 days
25273	YaelDillies author:YaelDillies	feat: `Finsupp.linearCombination MonoidAlgebra.of = id`	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	8/1	Mathlib/Algebra/MonoidAlgebra/Defs.lean	1	4	['YaelDillies', 'eric-wieser', 'github-actions']	nobody	none	11-40091 11 days ago	12-8231 12 days ago	12-8280 12 days
25291	YaelDillies author:YaelDillies	chore(Geometry/Convex/Cone/Basic): clean up	Rename all the `ConvexCone`s in the file to `C`, `C₁`, `C₂`. Previously they were `S`, `T`, `K₁`, `K₂`. Make sure to tag all the relevant lemmas with `norm_cast`. Fix lemma names. Golf proofs. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry toric	145/186	Mathlib/Analysis/Convex/Cone/Pointed.lean,Mathlib/Geometry/Convex/Cone/Basic.lean	2	1	['github-actions']	nobody	none	11-36836 11 days ago	11-41271 11 days ago	11-41327 11 days
22490	joelriou author:joelriou	feat(CategoryTheory/Functor): pointwise right derived functors	This PR introduces pointwise right derived functors as particular cases of pointwise left Kan extensions. --- - [x] depends on: #22474 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	160/0	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/PointwiseRightDerived.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	none	11-8730 11 days ago	11-8995 11 days ago	11-11016 11 days
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 label:t-algebra$	352/22	Mathlib.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LinearMap/Pi.lean,Mathlib/Algebra/Module/LinearMap/Prod.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,scripts/noshake.json	8	22	['eric-wieser', 'github-actions', 'lecopivo']	nobody	none	11-7081 11 days ago	11-7081 11 days ago	11-25466 11 days
25062	erdOne author:erdOne	feat(Algebra/MvPolynomial): nilpotents and units	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	113/0	Mathlib.lean,Mathlib/Algebra/MvPolynomial/Nilpotent.lean,Mathlib/Data/Finsupp/Basic.lean	3	8	['alreadydone', 'erdOne', 'eric-wieser', 'github-actions']	nobody	none	10-22453 10 days ago	19-70059 19 days ago	19-70108 19 days
24689	chrisflav author:chrisflav	feat(Topology): compact open covered sets	This is used to define the fpqc topology for schemes. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-algebraic-geometry t-topology	219/0	Mathlib.lean,Mathlib/Data/Set/Sigma.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Sets/CompactOpenCovered.lean,Mathlib/Topology/Sets/Opens.lean,Mathlib/Topology/Spectral/Prespectral.lean	6	5	['chrisflav', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant']	nobody	none	10-5014 10 days ago	10-5399 10 days ago	31-65140 31 days
25313	jt496 author:jt496	feat(SimpleGraph/FiveWheelLike): add the Andrásfai-Erdős-Sós theorem	Add the Andrásfai-Erdős-Sós theorem `colorable_of_cliqueFree_lt_minDegree` which says that an `r + 1`-cliquefree graph `G` with sufficiently large minimum degree is `r`-colorable. Co-authored-by: Lian Bremner Tattersall --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-combinatorics	307/4	Mathlib/Combinatorics/SimpleGraph/FiveWheelLike.lean	1	1	['github-actions']	nobody	none	9-73651 9 days ago	10-35687 10 days ago	10-35738 10 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	253/1	Mathlib.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroMulInt.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	7	22	['Ruben-VandeVelde', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky', 'smmercuri', 'xroblot']	nobody	1	9-68894 9 days ago	9-68894 9 days ago	51-21490 51 days
25322	thorimur author:thorimur	style: use simplex notation (`⦋n⦌`) where possible	`StandardSimplex.mk n` is replaced with `⦋n⦌` where possible (except in notation and macros, which are left untouched). This includes opening `Simplicial` in two files. Also, outdated and unused `local notation` `[n]` for `StandardSimplex.mk n` is removed. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	38/39	Mathlib/AlgebraicTopology/CechNerve.lean,Mathlib/AlgebraicTopology/MooreComplex.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Coskeletal.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean	7	1	['github-actions']	nobody	none	9-65931 9 days ago	9-76510 9 days ago	9-76563 9 days
25315	ocfnash author:ocfnash	feat: add `simp` to lemma `Fin.coe_ofNat_eq_mod`	One consequence is that `simp` can now prove things like this: ```lean example : (3 : Fin 10).val = 3 := by simp example : (4 : Fin 10).val = 4 := by simp example : (5 : Fin 10).val = 5 := by simp ``` previously this only this only worked up to `(2 : Fin 10).val = 2` (via lemmas like `Fin.val_two`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	32/28	Archive/Imo/Imo2024Q5.lean,Mathlib/AlgebraicTopology/DoldKan/Faces.lean,Mathlib/Analysis/CStarAlgebra/SpecialFunctions/PosPart.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Parity.lean,Mathlib/Data/Fin/Rev.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/GroupTheory/Perm/Fin.lean,Mathlib/RingTheory/ChainOfDivisors.lean,MathlibTest/matrix.lean	10	25	['b-mehta', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mattrobball', 'ocfnash']	nobody	1	9-18565 9 days ago	10-11743 10 days ago	10-11733 10 days
25267	YaelDillies author:YaelDillies	feat: `counit (antipode a) = counit a`	and unsimp `sum_antipode_mul_eq_algebraMap_counit`/`sum_mul_antipode_eq_algebraMap_counit` since they are annoying lemmas to fight against. From Toric Co-authored-by: Patrick Massot --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	51/18	Mathlib/RingTheory/Coalgebra/Basic.lean,Mathlib/RingTheory/HopfAlgebra/Basic.lean,Mathlib/RingTheory/HopfAlgebra/MonoidAlgebra.lean	3	9	['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	none	9-11474 9 days ago	9-11493 9 days ago	12-10225 12 days
25284	alreadydone author:alreadydone	feat(LinearAlgebra/Contraction): bijectivity of `dualTensorHom` + generalize to CommSemiring	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	168/44	Mathlib/Data/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/LinearAlgebra/Trace.lean,Mathlib/RingTheory/Finiteness/Finsupp.lean	5	5	['alreadydone', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	none	8-77320 8 days ago	11-79692 11 days ago	11-79677 11 days
25078	loefflerd author:loefflerd	feat(NumberTheory/ModularForms): GL(2, R) action preserves holomorphy	Show that the slash action of negative-determinant matrices preserves holomorphic functions. --- - [x] depends on: #25028 - [x] depends on: #24740 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	58/19	Mathlib/Analysis/Complex/UpperHalfPlane/Manifold.lean,Mathlib/NumberTheory/ModularForms/Basic.lean	2	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	none	8-38192 8 days ago	11-30057 11 days ago	11-30259 11 days
25343	plp127 author:plp127	docs(Topology/Perfect): Mention dense-in-itself	The file `Mathlib/Topology/Perfect` defines a "nonstandard" predicate `Preperfect C` to mean that every point of `C` is an accumulation point of `C`. This property already has a name, it is called [dense-in-itself](https://en.wikipedia.org/wiki/Dense-in-itself). This PR adds this name to the docs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology documentation	7/7	Mathlib/Topology/Perfect.lean	1	1	['github-actions']	nobody	none	8-27307 8 days ago	8-27385 8 days ago	8-27370 8 days
24777	joelriou author:joelriou	feat(CategoryTheory): abstract argument for the stability under transfinite compositions	If a class of morphisms is multiplicative, respects isomorphisms and is stable under filtered colimits, then it is stable under transfinite compositions. (This simplifies the proof in the case of monomorphisms in Grothendieck abelian categories, for isomorphisms, and in #23282, we shall apply this to monomorphisms in `Type`.) --- - [x] depends on: #24773 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory	122/116	Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/Colim.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/EnoughInjectives.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/Monomorphisms.lean,Mathlib/CategoryTheory/MorphismProperty/Limits.lean,Mathlib/CategoryTheory/MorphismProperty/TransfiniteComposition.lean	5	12	['callesonne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	1	8-11882 8 days ago	9-4698 9 days ago	21-28102 21 days
24514	b-mehta author:b-mehta	chore(Int/GCD): use fuel in xgcd	Modify the definition of xgcd to use fuel recursion, to allow it to be reduced in the kernel. As a consequence, this means the evaluation of field operations in ZMod p become provable by `rfl` and `decide`. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/opaque.20recursion.20definitions.20break.20mergeSort.20decidability --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	44/22	Mathlib/Data/Int/GCD.lean	1	4	['b-mehta', 'eric-wieser', 'github-actions', 'nomeata', 'urkud']	nobody	1	7-84218 7 days ago	39-19437 1 month ago	39-19489 39 days
25337	alreadydone author:alreadydone	feat(RingTheory): invertible modules and Picard group	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	535/0	Mathlib.lean,Mathlib/RingTheory/Finiteness/Cardinality.lean,Mathlib/RingTheory/PicardGroup.lean,docs/references.bib	4	37	['alreadydone', 'erdOne', 'github-actions', 'kckennylau']	nobody	none	7-62144 7 days ago	8-71866 8 days ago	8-71857 8 days
24320	robin-carlier author:robin-carlier	chore(Category/Theory/Whiskering): tag `[reassoc]` some lemmas about isoWhisker	Using the extension of `reassoc` to equality of isomorphisms, tags some lemmas in `CategoryTheory.Whiskering` with this new version of the attribute. --- - [ ] depends on: #24303 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	179/11	Mathlib.lean,Mathlib/CategoryTheory/Whiskering.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/IsoReassoc.lean,Mathlib/Tactic/CategoryTheory/Reassoc.lean,MathlibTest/CategoryTheory/Reassoc.lean	6	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	none	7-47673 7 days ago	7-47694 7 days ago	7-52796 7 days
25327	YaelDillies author:YaelDillies	feat: `F.obj M` is a commutative monoid object if `M` is	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric	11/3	Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean	2	1	['github-actions']	nobody	none	7-35334 7 days ago	9-34472 9 days ago	9-34465 9 days
25358	YaelDillies author:YaelDillies	chore: more shortcut instances for `ℤ`	Currently, some of those instances are inferred from `Int.instNormedCommRing : NormedCommRing ℤ` once one imports `Mathlib.Analysis.Normed.Ring.Lemmas`. Among other things, this confuses `#min_imports`, which then invariably reports that `Mathlib.Analysis.Normed.Ring.Lemmas` is used. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra easy label:t-algebra$	16/5	Mathlib/Algebra/Ring/Int/Defs.lean,Mathlib/NumberTheory/LegendreSymbol/GaussEisensteinLemmas.lean,Mathlib/NumberTheory/Zsqrtd/QuadraticReciprocity.lean	3	4	['eric-wieser', 'github-actions', 'leanprover-bot']	nobody	none	7-29639 7 days ago	7-38392 7 days ago	7-39164 7 days
25186	riccardobrasca author:riccardobrasca	feat: add `isPrincipalIdealRing_of_isPrincipal_of_lt_or_isPrincipal_of_mem_primesOver_of_mem_Icc`	The standard technique to prove that `𝓞 K` is principal in the Galois case. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	45/9	Mathlib/NumberTheory/NumberField/ClassNumber.lean	1	14	['faenuccio', 'github-actions', 'riccardobrasca']	nobody	none	6-37000 6 days ago	15-29033 15 days ago	15-29036 15 days
25235	ADedecker author:ADedecker	feat: unit space of a (locally) compact T1 monoid is (locally) compact	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology	50/0	Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Group/Basic.lean	2	2	['ADedecker', 'github-actions']	nobody	none	6-24085 6 days ago	13-30528 13 days ago	13-30513 13 days
24884	smmercuri author:smmercuri	feat: `ramificationIdx` for `NumberField.InfinitePlace`	--- - [x] depends on: #24880 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	38/0	Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	nobody	none	6-19398 6 days ago	21-24116 21 days ago	21-24464 21 days
24875	smmercuri author:smmercuri	feat: injectivity of `InfinitePlace.embedding`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	19/0	Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean	1	6	['Ruben-VandeVelde', 'github-actions', 'riccardobrasca', 'smmercuri', 'xroblot']	nobody	none	5-34998 5 days ago	26-48588 26 days ago	26-48642 26 days
25259	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): associated primes of localized module	We proved the `Ass(S^{-1}M)` is equal to the preimage of `Ass(M)` under `Ideal.comap` when over noetherian ring. From this we proved that every minimal primes over `Module.annihilator R M` is in `Ass(M)` when `M` is finitely generated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	70/11	Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean	1	6	['Thmoas-Guan', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant']	nobody	none	4-53977 4 days ago	11-30057 11 days ago	12-23956 12 days
25172	eric-wieser author:eric-wieser	feat: restricting `Affine.Simplex` to an affine subspace that contains it	Also removes a redundant `Nonempty` argument. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-euclidean-geometry	68/5	Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Basic.lean,Mathlib/LinearAlgebra/AffineSpace/Independent.lean	2	10	['eric-wieser', 'github-actions', 'jsm28', 'ocfnash']	nobody	1	4-16192 4 days ago	15-26171 15 days ago	15-67045 15 days
25030	Multramate author:Multramate	feat(NumberTheory/EllipticDivisibilitySequence): add elliptic nets	Defines elliptic nets and redefines elliptic sequences using elliptic relators. This is part of #13057 by Junyan Xu. Co-authored-by: Junyan Xu --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	259/37	Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	1	1	['github-actions']	nobody	none	3-33209 3 days ago	17-77730 17 days ago	17-77714 17 days
25215	mans0954 author:mans0954	feature(RingTheory/RootsOfUnity/Basic) : rootsOfUnity coercions	For a commutative monoid, `rootsOfUnity` can be coerced to the set `{z : R \| z^k = 1}`. For a commutative ring which is a domain, `rootsOfUnity` can be coerced to `nthRootsFinset k (1 : R)`. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/roots.20of.20unity.20-.20computing.20low.20degree/with/520362922 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	22/0	Mathlib/RingTheory/RootsOfUnity/Basic.lean	1	1	['github-actions']	nobody	none	2-39154 2 days ago	14-10564 14 days ago	14-10619 14 days
24828	mans0954 author:mans0954	feature(Algebra/Polynomial/Roots) : nthRoots_two_unit_of_char_ne_two	Compute the second roots of the unit for rings of characteristic not 2. See also: #25215 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	11/0	Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Data/Multiset/ZeroCons.lean	2	1	['github-actions']	nobody	none	2-39084 2 days ago	27-53731 27 days ago	27-59865 27 days
24809	robin-carlier author:robin-carlier	feat(CategoryTheory/Functor/KanExtension): preservations of Kan extensions	Introduce a typeclass `G.PreservesLeftKanExtension F L` that asserts that a functor `G` preserves the left Kan extension of `F` along a functor `L`. Introduce a pointwise variant, and relate it to the non-pointwise version when pointwise extensions exist. Show that a functor that preserves the relevant colimits preserve pointwise left Kan extensions. Construct isomorphisms `L.leftKanExtension F ⋙ G ≅ L.leftKanExtension (F ⋙ G)` when `G.PreservesLeftKanExtension F L` holds. Also construct a functorial version, as an isomorphism `L.lan ⋙ (whiskeringRight _ _ _).obj G ≅ (whiskeringRight _ _ _).obj G ⋙ L.lan`. All results are dualised to right Kan extensions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	551/0	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Functor/KanExtension/Preserves.lean	3	5	['TwoFX', 'github-actions', 'joelriou', 'robin-carlier']	nobody	none	2-25051 2 days ago	28-28334 28 days ago	28-28383 28 days
25331	fbarroero author:fbarroero	feat(RingTheory/Ideal/Maximal): `ne_top_iff_exists_maximal`	We add `Ideal.ne_top_iff_exists_maximal` and an analogous statement for `IsDedekindDomain.HeightOneSpectrum`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	18/0	Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/Ideal/Maximal.lean	2	5	['Ruben-VandeVelde', 'fbarroero', 'github-actions']	nobody	none	2-7027 2 days ago	9-18489 9 days ago	9-18541 9 days
25174	zcyemi author:zcyemi	feat(Geometry/Euclidean/Triangle): add law of sines	--- Implement the vector and angle-at-point forms of the law of sines. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-euclidean-geometry	57/1	Mathlib/Geometry/Euclidean/Triangle.lean	1	15	['eric-wieser', 'github-actions', 'jsm28', 'zcyemi']	nobody	none	1-29741 1 day ago	15-50897 15 days ago	15-50951 15 days
22834	joelriou author:joelriou	feat(CategoryTheory): lifting properties and parametrized adjunctions	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.) --- - [x] depends on: #22828 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	309/0	Mathlib.lean,Mathlib/CategoryTheory/LiftingProperties/Basic.lean,Mathlib/CategoryTheory/LiftingProperties/ParametrizedAdjunction.lean	3	10	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	none	1-9993 1 day ago	17-77605 17 days ago *	17-77596 17 days *
25348	wwylele author:wwylele	feat(LinearAlgebra): add independent iSup to LinearPMap	This is part of #25140. To obtain the Hahn embedding, we need to construct an partial linear map spanned by a family of submodules as the base case. This PR prepares for it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	94/2	Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/LinearPMap.lean	2	2	['eric-wieser', 'github-actions']	nobody	none	0-72911 20 hours ago	8-9468 8 days ago	8-9532 8 days
24530	chrisflav author:chrisflav	feat(RingTheory): faithfully flat ring maps	Co-authored by: Joël Riou --- - [x] depends on: #24375 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	92/1	Mathlib.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/RingTheory/RingHom/FaithfullyFlat.lean,Mathlib/RingTheory/RingHom/Flat.lean	4	4	['chrisflav', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1	0-42212 11 hours ago	30-36220 30 days ago	30-37286 30 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	276/21	Mathlib.lean,Mathlib/CategoryTheory/FiberedCategory/Cartesian.lean,Mathlib/CategoryTheory/FiberedCategory/HasFibers.lean,Mathlib/CategoryTheory/FiberedCategory/HomLift.lean	4	26	['callesonne', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	none	0-40081 11 hours ago	233-21757 7 months ago *	0-571 9 minutes *
24379	chrisflav author:chrisflav	feat(Algebra/AlgHom): `Unique` if target is `Subsingleton`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	32/0	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean	2	6	['chrisflav', 'eric-wieser', 'github-actions']	nobody	none	0-38535 10 hours ago	39-28735 1 month ago	39-64672 39 days
25334	matthewjasper author:matthewjasper	feat(RingTheory/Flat): Add theorems relating Submodule.torsion and Module.Flat	Co-authored-by: Kevin Buzzard --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT new-contributor t-algebra label:t-algebra$	202/0	Mathlib.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/RingTheory/Flat/TorsionFree.lean,Mathlib/RingTheory/Ideal/IsPrincipal.lean	5	13	['alreadydone', 'erdOne', 'github-actions', 'kbuzzard']	nobody	none	0-24330 6 hours ago	9-7627 9 days ago	9-7626 9 days
25365	YaelDillies author:YaelDillies	feat: `CommAlgCat` is cocartesian-monoidal	Construct the cocartesian-monoidal category structure on `CommAlgCat R` explicitly from the tensor product. From Toric 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 t-algebra label:t-algebra$	142/5	Mathlib.lean,Mathlib/Algebra/Category/CommAlgCat/Basic.lean,Mathlib/Algebra/Category/CommAlgCat/Monoidal.lean	3	8	['YaelDillies', 'erdOne', 'github-actions']	nobody	none	0-18718 5 hours ago	7-26981 7 days ago	7-28134 7 days
25168	wwylele author:wwylele	feat(RingTheorey/HahnSeries): equip HahnSeries with LinearOrder	This is part of #25140. As the future codomain of Hahn embedding theorem, `HahnSeries` needs a linear order. ~~It might be debatable whether the lexicographical order should be the order of `HahnSeries`. Aside from usage in Hahn embedding theorem, this order also represents, for example, the asymptotic behavior around `(x : R) = 0`, so it is generally useful.~~ Updated to add `LinearOrder` on `Lex (HahnSeries _ _)` instead --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	180/0	Mathlib.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Basic.lean,Mathlib/RingTheory/HahnSeries/Lex.lean	4	10	['ScottCarnahan', 'eric-wieser', 'github-actions', 'wwylele']	nobody	none	0-5576 1 hour ago	15-72780 15 days ago	15-72831 15 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
20719	gio256 author:gio256	feat(AlgebraicTopology): delaborators for truncated simplicial notations	We add delaborators for the following notations, introduced in #20688: - `⦋m⦌ₙ`, which denotes the `m`-dimensional simplex in the `n`-truncated simplex category. - `X _⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated simplicial object `X`. - `X ^⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated cosimplicial object `X`. If `pp.proofs` is set to `true`, we also pretty-print the proof `p : m ≤ n` for all three notations as `⦋m, p⦌ₙ`, `X _⦋m, p⦌ₙ`, and `X ^⦋m, p⦌ₙ`, respectively. Credit to @kmill for one piece of code and much metaprogramming inspiration. --- - [x] depends on: #20688 - [x] depends on: #23018 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos t-category-theory t-meta	525/33	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SimplexCategory.lean,Mathlib/Util/Superscript.lean,MathlibTest/SimplexCategory.lean,MathlibTest/SimplicialObject.lean,MathlibTest/superscript.lean,scripts/noshake.json	11	22	['eric-wieser', 'gio256', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot']	eric-wieser assignee:eric-wieser	none	39-7178 1 month ago	39-9819 1 month ago	47-81361 47 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	6	['bryangingechen', 'github-actions', 'grunweg']	robertylewis assignee:robertylewis	none	32-46758 1 month ago	97-11003 3 months ago	97-10992 97 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	2	['github-actions', 'grunweg']	mariainesdff assignee:mariainesdff	none	32-46491 1 month ago	52-14174 1 month ago	52-14228 52 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']	ericrbg assignee:ericrbg	none	32-26308 1 month ago	91-16059 2 months ago	91-16110 91 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	21	['ADedecker', 'AntoineChambert-Loir', 'erdOne', 'github-actions', 'grunweg']	ADedecker and AntoineChambert-Loir assignee:AntoineChambert-Loir assignee:ADedecker	none	32-26230 1 month ago	52-85074 1 month ago	63-47491 63 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']	TwoFX assignee:TwoFX	none	32-26214 1 month ago	56-36648 1 month ago	56-36630 56 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	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']	urkud assignee:urkud	none	32-19721 1 month ago	47-9884 1 month ago	48-19934 48 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	6	['eric-wieser', 'github-actions', 'plp127']	ericrbg assignee:ericrbg	none	31-75873 1 month ago	66-2110 2 months ago	66-2161 66 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']	adamtopaz assignee:adamtopaz	none	31-75742 1 month ago	59-70313 1 month ago	59-70362 59 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	816/2	Mathlib.lean,Mathlib/Algebra/Lie/Derivation/AdjointAction.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LieAlgebra/Basic.lean,Mathlib/Tactic/LieAlgebra/LieRingNF.lean,Mathlib/Util/AtomM.lean,MathlibTest/lie_ring.lean,scripts/noshake.json	8	16	['bryangingechen', 'eric-wieser', 'faenuccio', 'github-actions', 'grunweg', 'ocfnash', 'siddhartha-gadgil', 'xyzw12345']	robertylewis assignee:robertylewis	none	31-30093 1 month ago	106-61592 3 months ago	106-61583 106 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']	Ruben-VandeVelde assignee:Ruben-VandeVelde	1	31-28220 1 month ago	56-29490 1 month ago	56-29544 56 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']	kmill assignee:kmill	none	31-28133 1 month ago	78-2807 2 months ago	126-22495 126 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	277/80	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	9	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'sgouezel', 'urkud']	loefflerd assignee:loefflerd	none	31-23140 1 month ago	69-4593 2 months ago	107-57540 107 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	43	['Paul-Lez', 'Whysoserioushah', 'eric-wieser', 'github-actions', 'kbuzzard']	eric-wieser assignee:eric-wieser	none	31-21018 1 month ago	75-73462 2 months ago	75-73506 75 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$	100/0	Mathlib.lean,Mathlib/Algebra/Clone/Defs.lean	2	22	['Timeroot', 'YaelDillies', 'dupuisf', 'eric-wieser', 'github-actions', 'urkud']	YaelDillies assignee:YaelDillies	none	30-81075 30 days ago	63-17358 2 months ago	65-66460 65 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	14	['github-actions', 'grunweg', 'hrmacbeth', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'sgouezel']	grunweg assignee:grunweg	none	27-82562 27 days ago	81-30618 2 months ago	82-15074 82 days
24372	Hagb author:Hagb	feat(Tactic/SimpIntro): add support for introducing non-propositions	`simp_intro` would be able to introduce non-propositions. The previous `simp_intro` tactic cannot solve some statement that can be solved by applying `intro` and `simp` like `simp_intro`. For example, the following one can be solved like this ```lean example (r : Nat → Prop) : (∀ x, x > 0 → r x) → ∀ y z, y = 0 → z > y → r z := by simp intro hr try simp at hr -- does nothing try simp [hr] -- does nothing intro y z try simp [hr] -- does nothing intro hy try simp [hr] at hy -- does nothing simp [hr, hy] intro hyz try simp [hr, hy] at hyz simp [hr, hy, hyz] -- accomplish the goal successfully ``` while the previous `simp_intro` cannot introduce `y` and `z` here. ```lean example (r : Nat → Prop) : (∀ x, x > 0 → r x) → ∀ y z, y = 0 → z > y → r z := by /- the previous `simp_intro` fails with message: invalid 'simp', proposition expected Nat -/ simp_intro .. -- or `simp_intro hr y` example (r : Nat → Prop) : (∀ x, x > 0 → r x) → ∀ y z, y = 0 → z > y → r z := by -- unsolved simp_intro hr example (r : Nat → Prop) : (∀ x, x > 0 → r x) → ∀ y z, y = 0 → z > y → r z := by -- successfully solve the goal with the `simp_intro` in thie commit simp_intro .. -- or `simp_intro hr y z hy hz` ``` This commit makes it be able to introduce these kinds of hypotheses. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta	13/2	Mathlib/Tactic/SimpIntro.lean,MathlibTest/simp_intro.lean	2	1	['github-actions']	kmill assignee:kmill	none	27-81860 27 days ago	45-5392 1 month ago	45-5443 45 days
24395	rudynicolop author:rudynicolop	feat(Data/List): list splitting definitions and lemmas	Adds definitions and lemmas for obtaining all prefixes and suffixes of lists. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	143/2	Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/List/TakeDrop.lean	2	1	['github-actions']	ericrbg assignee:ericrbg	none	27-81842 27 days ago	44-2869 1 month ago	44-2931 44 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	7	['Louddy', 'Ruben-VandeVelde', 'alreadydone', 'github-actions', 'grunweg']	kbuzzard assignee:kbuzzard	1	26-44624 26 days ago	26-44624 26 days ago	53-45384 53 days
19796	peakpoint author:peakpoint	feat: L'Hopital's rule from within a convex set	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	190/19	Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Convex/Topology.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Order/Interval/Set/Basic.lean	5	14	['RemyDegenne', 'github-actions', 'leanprover-community-bot-assistant', 'peakpoint', 'sgouezel']	sgouezel assignee:sgouezel	none	21-79134 21 days ago	21-79134 21 days ago	55-29418 55 days
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 for `card α ≤ card β` on the vertex type `V` have at most `(card β-1)^(1/(card α))(card V)^(2-1/(card α))/2 + (card V)(card α-1)/2` edges. --- - [x] depends on: #19865 - [x] depends on: #20738 I'd like to make `aux` not private in the `KovariSosTuran` namespace to enable reuse of the double-counting here, but I don't know what to call it. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	289/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/KovariSosTuran.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot']	awainverse assignee:awainverse	none	19-29414 19 days ago	41-69299 1 month ago	41-69833 41 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']	mariainesdff assignee:mariainesdff	1	19-29279 19 days ago	64-12686 2 months ago	110-85911 110 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$	66/4	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/GroupTheory/Index.lean,Mathlib/LinearAlgebra/Determinant.lean	4	10	['Ruben-VandeVelde', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'xroblot']	ericrbg assignee:ericrbg	none	19-29255 19 days ago	42-41084 1 month ago	78-83644 78 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$	615/3	Mathlib.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean	5	6	['BoltonBailey', 'Timeroot', 'github-actions', 'grunweg']	adomani assignee:adomani	none	19-28937 19 days ago	65-82525 2 months ago	65-82572 65 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 - [x] depends on: #24503 - [x] depends on: #24968 - [x] depends on: #25029	t-euclidean-geometry	556/0	Mathlib.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Geometry/Euclidean/Altitude.lean,Mathlib/Geometry/Euclidean/Incenter.lean	4	53	['JovanGerb', 'eric-wieser', 'github-actions', 'jsm28', 'mathlib4-dependent-issues-bot']	eric-wieser assignee:eric-wieser	none	19-26 19 days ago	20-11713 20 days ago	62-48480 62 days
24333	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): cycle graph implementation for generic vertex types	The existing `cycleGraph` implementation under Combinatorics/SimpleGraph/Circulant.lean only operates over `Fin n`. This PR implements a cycle graph implementation over any generic vertex type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	187/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Cycle.lean	2	29	['IvanRenison', 'github-actions']	kmill assignee:kmill	none	18-68272 18 days ago	46-65829 1 month ago	46-65883 46 days
16074	Rida-Hamadani author:Rida-Hamadani	feat: combinatorial maps and planar graphs	We define combinatorial maps, then we define planar graph using combinatorial maps. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	243/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Planar.lean,Mathlib/Data/CombinatorialMap.lean	3	27	['Parcly-Taxel', 'Rida-Hamadani', 'github-actions', 'lambda-fairy', 'leanprover-community-bot-assistant']	kmill assignee:kmill	none	18-24212 18 days ago	43-35814 1 month ago	47-23245 47 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	59	['FLDutchmann', 'Paul-Lez', 'YaelDillies', 'eric-wieser', 'github-actions', 'grunweg', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	eric-wieser assignee:eric-wieser	none	18-24063 18 days ago	54-35449 1 month ago	109-82571 109 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`. 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$	30/0	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Set/Image.lean	2	5	['b-reinke', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	joelriou assignee:joelriou	none	18-23928 18 days ago	46-44557 1 month ago	59-45080 59 days
24139	yuanyi-350 author:yuanyi-350	feat: add `Fin.cycleIcc` which rotates `range(i, j)`	In this file, I define permutation `cycleIcc i j hij`, which is the cycle `(i i+1 .... j)` leaving `(0 ... i-1)` and `(j+1 ... n-1)` unchanged. In other words, it rotates elements in `[i, j]` one step to the right. Also I prove some properties of `cycleIcc i j hij` such as it is a cycle and its cycleType is `j - i` This definition is used to prove the following result: ``` theorem succAbove_comp_cycleIcc [NeZero n] (x : Fin (n + 1) → L) (i j : Fin (n + 1)) (eq : x i = x j) (lt : i < j) x ∘ i.succAbove = x ∘ j.succAbove ∘ (cycleIcc hij) ``` More clearly, `x ∘ i.succAbove` and `x ∘ j.succAbove` are `Fin n → L` types. For example, when `n = 6, i = 2, j = 5` and `x i = x j` ``` x ∘ i.succAbove = (x 0, x 1, x 3, x 4, x 5, x 6) x ∘ j.succAbove = (x 0, x 1, x 2, x 3, x 4, x 6) ``` We have ``` (x 0, x 1, x 3, x 4, x 5, x 6) --(cycleIcc)--->(x 0, x 1, x 5, x 3, x 4, x 6) = (x 0, x 1, x 2, x 3, x 4, x 6) ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	132/1	Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Nat/SuccPred.lean,Mathlib/GroupTheory/Perm/Fin.lean	4	27	['acmepjz', 'faenuccio', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mbkybky', 'yuanyi-350']	faenuccio assignee:faenuccio	none	18-23587 18 days ago	38-69996 1 month ago	52-84299 52 days
24546	jt496 author:jt496	feat(Combinatorics/SimpleGraph): add homOfConnectedComponents and related results	Given homomorphisms of each connected component of `G : SimpleGraph α` into `H : SimpleGraph β `give the corresponding `G →g H` Hence prove that G is n - colorable iff each connected component is n - colorable. Also prove that G is 2-colorable iff it does not contain an odd length loop (closed walk). I wasn't sure where to put this - it probably belongs in SimpleGraph.ConcreteColorings? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	36/0	Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean	3	3	['IvanRenison', 'github-actions', 'jt496']	b-mehta assignee:b-mehta	none	18-23441 18 days ago	38-24851 1 month ago	38-40361 38 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	255/81	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']	kmill assignee:kmill	none	18-21038 18 days ago	67-38583 2 months ago	101-35078 101 days
24497	Parcly-Taxel author:Parcly-Taxel	feat: IMO 1985 Q2		IMO	100/0	Archive.lean,Archive/Imo/Imo1985Q2.lean	2	1	['github-actions']	dwrensha assignee:dwrensha	none	16-10479 16 days ago	39-37793 1 month ago	39-37776 39 days
24517	upobir author:upobir	feat(Algebra/QuadraticDiscriminant): Adding inequalities on quadratic from inequalities on discriminant	--- This pr adds inequalities that relate `0` and `a * (x * x) + b * x + c` from inequalities of `a` and `discrim a b c`. For example, negative discriminant and negative leading coefficient implies value of quadratic expression is always negative and similar. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	35/0	Mathlib/Algebra/QuadraticDiscriminant.lean	1	1	['github-actions']	chrisflav assignee:chrisflav	none	16-10458 16 days ago	39-16657 1 month ago	39-16709 39 days
24522	dagurtomas author:dagurtomas	chore(Condensed): introduce an abbrev for the equivalence of light condensed sets with a category of sheaves on a small site	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-condensed	39/0	Mathlib.lean,Mathlib/Condensed/Light/Small.lean	2	1	['github-actions']	joneugster assignee:joneugster	none	16-10408 16 days ago	39-9950 1 month ago	39-10005 39 days
24685	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Preserves): Preservations of (co)limits by bifunctors	Introduce a typeclass `PreservesColimit₂` that bundles the assumption that a bifunctor preserves a pair of colimit diagrams in each of its variables. This is stated in terms of a construction `Functor.mapCocone₂` that applies a bifunctor `G` to a pair of cocones to get a cocone over the uncurryfication of `whiskeringLeft₂ _\|>.obj _\|>.obj _\|>.obj G`. The cocone points of this construction is definitionally the evaluation of `G` at the cocone points of the two cocones given as parameters. We give helper functions to extract isomorphisms with abstract colimits out of this typeclass, and we characterize these isomorphisms with respect to the canonical maps to the colimits. The dual typeclass for limits is also introduced. --- The definition of `Functor.mapCocone₂` and of `PreservesColimit₂` is due to @joelriou and was suggested during review of #17781. This PR only contains basic definitions, but does not give any interesting ways of inferring a `PreservesColimit₂` instance. This will be the content of a follow-up PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	243/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Preserves/Bifunctor.lean	2	1	['github-actions']	joelriou assignee:joelriou	none	16-10290 16 days ago	32-15906 1 month ago	32-15960 32 days
24213	BoltonBailey author:BoltonBailey	feat: add simp lemmas for trig functions on `π * 2⁻¹`	This PR adds a number of simp lemmas to reduce trig functions evaluated on `π * 2⁻¹`. This allows `simp` to reduce expressions such as `sin (π * (1 / 2))` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	45/0	Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean	1	3	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant']	YaelDillies assignee:YaelDillies	none	16-2360 16 days ago	31-9258 1 month ago	49-66650 49 days
24816	ciskiko author:ciskiko	feat(GroupTheory): add Regular Wreath Product	feat: add regular wreath product and some results; add iterated wreath product; add the isomorphism of iterated wreath product of Z_p to sylow p subgroup of S_{p^n}. Needs some work simplifying final result. --- [![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$	285/1	Mathlib.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/GroupTheory/RegularWreathProduct.lean,Mathlib/Logic/Equiv/Fin/Basic.lean,Mathlib/SetTheory/Cardinal/Finite.lean	7	102	['ciskiko', 'github-actions', 'tb65536']	tb65536 assignee:tb65536	none	15-33430 15 days ago	15-33431 15 days ago	24-38027 24 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	4	['fbarroero', 'github-actions', 'mans0954']	ericrbg assignee:ericrbg	none	10-82258 10 days ago	81-2744 2 months ago	81-2735 81 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']	PatrickMassot assignee:PatrickMassot	none	6-18915 6 days ago	82-35471 2 months ago	82-37366 82 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	7	['Paul-Lez', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'ocfnash', 'xyzw12345']	ocfnash assignee:ocfnash	none	6-18655 6 days ago	68-51515 2 months ago	69-83302 69 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	118/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented.lean	2	5	['github-actions', 'joelriou', 'robin-carlier']	joelriou assignee:joelriou	none	5-81078 5 days ago	20-23280 20 days ago	90-81566 90 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$	62/0	Mathlib.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/RingTheory/Regular/Category.lean	3	36	['Thmoas-Guan', 'erdOne', 'github-actions', 'joelriou', 'riccardobrasca']	joelriou assignee:joelriou	none	4-54006 4 days ago	17-33074 17 days ago	49-76048 49 days
24465	adomani author:adomani	feat: a linter to enforce formatting	This linter enforces that the hypotheses of every declaration are correctly formatted. This already required multiple PRs to make mathlib compliant. Ideally, little by little the linter can be extended to format more of mathlib. --- The default linter option is `false`, but the lakefile enforces it to be `true`. This means that the linter does not run on `MathlibTest`. However, the tests should still be compliant, since the default option was `true` in development and the tests were fixed. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter maintainer-merge	876/4	Mathlib.lean,Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/Group/Nat/Defs.lean,Mathlib/Algebra/Ring/Int/Defs.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/CommandStart.lean,Mathlib/Tactic/Simps/NotationClass.lean,MathlibTest/CommandStart.lean,MathlibTest/EuclideanSpace.lean,MathlibTest/Simps.lean,MathlibTest/Traversable.lean,MathlibTest/antidiagonal.lean,MathlibTest/delabLinearIndependent.lean,MathlibTest/matrix.lean,MathlibTest/norm_num.lean,MathlibTest/set_like.lean,MathlibTest/vec_notation.lean	20	89	['Parcly-Taxel', 'adomani', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	grunweg assignee:grunweg	1	4-30689 4 days ago	27-42382 27 days ago *	40-47103 40 days *
24578	b-mehta author:b-mehta	feat(Pointwise): cardinality of product set in GroupWithZero	This PR: * generalises the assumptions to `card_le_card_image₂_left` and `card_le_card_image₂_right` and golf these: they previously required injectivity everywhere despite using it in only one place. (These lemmas were also used in exactly one place each in mathlib) * adds `card_le_card_mul_left_of_injective` and `card_le_card_mul_right_of_injective` which generalise the typeclass assumptions on the existing `card_le_card_mul_left` and `card_le_card_mul_right` * uses the above to add versions of `card_le_card_mul_left` and `card_le_card_mul_right` in groups with zero. This is useful for applying the pointwise constructions to fields In fact, the first versions of all the above lemmas were written in this generality, but that was seemingly lost during an upstream. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	54/16	Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/GroupWithZero/Pointwise/Finset.lean,Mathlib/Data/Finset/NAry.lean	3	1	['github-actions']	mariainesdff assignee:mariainesdff	none	2-20790 2 days ago	32-33368 1 month ago	36-70971 36 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	2	['Timeroot', 'github-actions']	fpvandoorn assignee:fpvandoorn	none	1-19362 1 day ago	70-16572 2 months ago	70-16623 70 days
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. --- - [x] depends on: #24142 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	159/0	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/Adjunction.lean,docs/references.bib	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	adamtopaz assignee:adamtopaz	none	1-14703 1 day ago	22-81104 22 days ago	22-81087 22 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/)	t-data	65/0	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Set/Card/Arithmetic.lean,Mathlib/Data/Set/Finite/Lattice.lean	3	11	['YaelDillies', 'chrisflav', 'github-actions']	YaelDillies assignee:YaelDillies	none	0-42428 11 hours ago	31-25784 1 month ago	61-54575 61 days
24520	chrisflav author:chrisflav	feat(Algebra/Pi): add various `AlgEquiv`s and `RingEquiv`s	Add - `RingEquiv.sumArrowEquivProdArrow`: ring version of `Equiv.sumArrowEquivProdArrow`. - `AlgEquiv.sumArrowEquivProdArrow`: algebra version of `Equiv.sumArrowEquivProdArrow`. - `AlgEquiv.piCongrLeft'`: algebra version of `Equiv.piCongrLeft`. - `AlgEquiv.piCongrLeft`: algebra version of `Equiv.piCongrLeft`. - `AlgEquiv.funUnique`: algebra version of `Equiv.funUnique`. - `AlgEquiv.prodCongr`: algebra version of `Equiv.prodCongr`. The four last ones already have ring versions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	116/1	Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Ring/Equiv.lean	3	20	['Ruben-VandeVelde', 'chrisflav', 'eric-wieser', 'github-actions', 'mistarro']	eric-wieser assignee:eric-wieser	none	0-38754 10 hours ago	15-76048 15 days ago	39-8351 39 days

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

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PRs addressing technical debt

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
25161	BoltonBailey author:BoltonBailey	chore(Algebra/Squarefree/Basic): fix erw	This PR addresses an instance of the `erw` linter in `Algebra/Squarefree/Basic` by adding a `squarefree_def` theorem and using this to isolate the implementation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-algebra awaiting-author label:t-algebra$	4/1	Mathlib/Algebra/Squarefree/Basic.lean	1	3	['b-mehta', 'eric-wieser', 'github-actions']	nobody	11-57924 11 days ago	11-57924 11 days ago	4-35623 4 days
25556	Parcly-Taxel author:Parcly-Taxel	chore: remove >6 month old material in `Deprecated`		file-removed tech debt	0/250	Mathlib.lean,Mathlib/Deprecated/Cardinal/Continuum.lean,Mathlib/Deprecated/Cardinal/Finite.lean,Mathlib/Deprecated/Cardinal/PartENat.lean,Mathlib/Deprecated/Order.lean	5	1	['github-actions']	nobody	2-55793 2 days ago	2-55846 2 days ago	2-55905 2 days
25580	Parcly-Taxel author:Parcly-Taxel	chore: deprime `induction` in `AlgebraicTopology/CategoryTheory`	Most replacements that are also in #23676 have been copied over, but some have been optimised further.	tech debt	134/125	Mathlib/AlgebraicTopology/DoldKan/Decomposition.lean,Mathlib/AlgebraicTopology/DoldKan/Degeneracies.lean,Mathlib/AlgebraicTopology/DoldKan/NCompGamma.lean,Mathlib/AlgebraicTopology/DoldKan/Projections.lean,Mathlib/AlgebraicTopology/SimplexCategory/MorphismProperty.lean,Mathlib/AlgebraicTopology/SimplicialObject/Split.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/EnoughInjectives.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/Subobject.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/Extensive.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Galois/Decomposition.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/SequentialProduct.lean,Mathlib/CategoryTheory/Limits/Types/Colimits.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Quotient.lean,Mathlib/CategoryTheory/Sites/Sheaf.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/CategoryTheory/Triangulated/TStructure/Basic.lean	28	3	['Parcly-Taxel', 'eric-wieser', 'github-actions']	nobody	1-30932 1 day ago	1-57008 1 day ago	1-56994 1 day
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	238/238	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	0-66274 18 hours ago	0-66296 18 hours ago	6-59911 6 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	71/77	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/GroupTheory/Perm/Sign.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Ring.lean	19	11	['Parcly-Taxel', 'apnelson1', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'urkud']	nobody	0-51824 14 hours ago	2-794 2 days ago	63-65172 63 days
25617	Parcly-Taxel author:Parcly-Taxel	chore: fix more induction/recursor branch names	These were found using the regex `\\| h. =>` and `def.rec.\(h. :`.	tech debt	88/79	Mathlib/Analysis/Convolution.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/NatAntidiagonal.lean,Mathlib/Data/Nat/Factorization/Induction.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Set/Card.lean,Mathlib/Data/WSeq/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/Logic/Function/Iterate.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/SumFourSquares.lean,Mathlib/NumberTheory/SumTwoSquares.lean,Mathlib/Order/Synonym.lean	14	1	['github-actions']	nobody	0-32126 8 hours ago	0-42925 11 hours ago	0-42910 11 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	313-42770 10 months ago	335-23470 11 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	294-85555 9 months ago	335-23470 11 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	294-9120 9 months ago	294-84667 9 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	262-8623 8 months ago	262-8623 8 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	130-84729 4 months ago	130-84729 4 months ago	0-9411 2 hours
22682	grunweg author:grunweg	chore(Topology/Homeomorph): split out various constructions	This makes `Homeomorph.lean` slightly more manageable, and also is a mild import reduction. edit: also split out IsHomeomorph, as this allows removing the dependencies on Constructions. Let's see if this gains much --- I don't feel strongly about this PR, but we might as well take it. - [ ] depends on: #22681 - [ ] depends on #22827 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-topology RFC merge-conflict	341/290	Mathlib.lean,Mathlib/Topology/Category/TopCat/ULift.lean,Mathlib/Topology/Homeomorph/Constructions.lean,Mathlib/Topology/Homeomorph/IsHomeomorph.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/NoetherianSpace.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	69-57349 2 months ago	69-57349 2 months ago	14-35834 14 days
23411	PatrickMassot author:PatrickMassot	chore: remove finiteness from Order.Filter.Lift	Co-authored-by: Anatole Dedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	longest-pole t-topology merge-conflict	48/21	Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Order/Filter/Lift.lean,Mathlib/Order/Filter/SmallSets.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Basic.lean	7	4	['Vierkantor', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	62-38370 2 months ago	62-57939 2 months 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	55-47427 1 month ago	55-47429 1 month 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	52-5824 1 month ago	52-5826 1 month ago	0-3406 56 minutes
24483	Parcly-Taxel author:Parcly-Taxel	chore: delete >6 month old deprecations (2024-10)	See #24271 for the general pattern of regex used in the first (automated) commit. The date range used in this PR is `2024-10-..`.	tech debt merge-conflict	2/1182	Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/AlgebraicGeometry/Morphisms/ClosedImmersion.lean,Mathlib/AlgebraicGeometry/Morphisms/Preimmersion.lean,Mathlib/AlgebraicGeometry/Restrict.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Comp.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/LineDeriv/Basic.lean,Mathlib/Analysis/Complex/ReImTopology.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean,Mathlib/CategoryTheory/Limits/Preserves/Limits.lean,Mathlib/CategoryTheory/Sites/Canonical.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/List/Flatten.lean,Mathlib/Data/List/SplitBy.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/Defs.lean,Mathlib/Data/Nat/Factorization/PrimePow.lean,Mathlib/Data/Set/Subset.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Algebra.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/AEStronglyMeasurable.lean,Mathlib/MeasureTheory/Measure/DiracProba.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/MeasureTheory/Measure/ProbabilityMeasure.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/Order/InitialSeg.lean,Mathlib/Order/WellFounded.lean,Mathlib/Probability/Density.lean,Mathlib/RingTheory/Finiteness/Cardinality.lean,Mathlib/RingTheory/Finiteness/Ideal.lean,Mathlib/RingTheory/Jacobson/Ring.lean,Mathlib/RingTheory/Localization/Cardinality.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/Spectrum/Prime/TensorProduct.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/SetTheory/Game/Nim.lean,Mathlib/SetTheory/PGame/Algebra.lean,Mathlib/Tactic/FunProp/ContDiff.lean,Mathlib/Topology/AlexandrovDiscrete.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Constructions/DomMulAct.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Group/CompactOpen.lean,Mathlib/Topology/Algebra/Group/Quotient.lean,Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/Multilinear/Topology.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakBilin.lean,Mathlib/Topology/Algebra/Monoid.lean,Mathlib/Topology/Algebra/MulAction.lean,Mathlib/Topology/Algebra/Ring/Ideal.lean,Mathlib/Topology/Algebra/SeparationQuotient/Section.lean,Mathlib/Topology/Algebra/StarSubalgebra.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Category/Profinite/Nobeling/Induction.lean,Mathlib/Topology/Category/TopCat/EffectiveEpi.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/CompactOpen.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Compactness/Lindelof.lean,Mathlib/Topology/Compactness/LocallyCompact.lean,Mathlib/Topology/Compactness/SigmaCompact.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Connected/Clopen.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Connected/TotallyDisconnected.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Bounded/Basic.lean,Mathlib/Topology/ContinuousMap/ContinuousMapZero.lean,Mathlib/Topology/ContinuousMap/Sigma.lean,Mathlib/Topology/ContinuousMap/T0Sierpinski.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/Defs/Induced.lean	139	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	35-41124 1 month ago	35-41126 1 month ago	4-54091 4 days
24100	eric-wieser author:eric-wieser	feat: restore some explicit binders from Lean 3	Part of #24099 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt merge-conflict awaiting-author	39/42	Mathlib/Data/FinEnum.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Compactness/CompactlyGeneratedSpace.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/Metrizable/CompletelyMetrizable.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	10	3	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	15-21523 15 days ago	15-21525 15 days ago	34-33204 34 days
24409	urkud author:urkud	chore(*): fix `nmem` vs `not_mem` names	--- There are some missing/buggy deprecations, I'm going to fix them later today or tomorrow. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip tech debt merge-conflict delegated awaiting-author	317/176	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/Group/Indicator.lean,Mathlib/Algebra/Group/Support.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Order/Group/Indicator.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Support.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/Rademacher.lean,Mathlib/Analysis/Complex/RemovableSingularity.lean,Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Analysis/Convex/Cone/Proper.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Distribution/AEEqOfIntegralContDiff.lean,Mathlib/Data/LocallyFinsupp.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Dynamics/Ergodic/Conservative.lean,Mathlib/Dynamics/Ergodic/Ergodic.lean,Mathlib/Dynamics/Ergodic/Function.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/FreeModule/PID.lean,Mathlib/LinearAlgebra/PID.lean,Mathlib/LinearAlgebra/RootSystem/Base.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Lemmas.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSpace/Indicator.lean,Mathlib/MeasureTheory/Integral/Average.lean,Mathlib/MeasureTheory/Integral/Bochner/Set.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Basic.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean,Mathlib/MeasureTheory/Measure/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Measure/AddContent.lean,Mathlib/MeasureTheory/Measure/DiracProba.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean,Mathlib/MeasureTheory/OuterMeasure/AE.lean,Mathlib/MeasureTheory/SetSemiring.lean,Mathlib/Order/Filter/AtTopBot/CountablyGenerated.lean,Mathlib/Order/Filter/Cocardinal.lean,Mathlib/Order/Filter/Cofinite.lean,Mathlib/Order/Filter/Tendsto.lean,Mathlib/Order/Filter/Ultrafilter/Basic.lean,Mathlib/Probability/Distributions/Uniform.lean,Mathlib/Probability/Kernel/Basic.lean,Mathlib/Probability/Kernel/Composition/MeasureCompProd.lean,Mathlib/RingTheory/AdicCompletion/LocalRing.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/NewtonIdentities.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/Spectrum/Maximal/Localization.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/Topology/Algebra/InfiniteSum/Group.lean,Mathlib/Topology/Algebra/Module/Cardinality.lean,Mathlib/Topology/Algebra/Support.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/ContinuousMap/BoundedCompactlySupported.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/UrysohnsLemma.lean	77	4	['b-mehta', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib-bors']	nobody	7-49043 7 days ago	7-49043 7 days ago	0-55045 15 hours
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 merge-conflict	5/4	Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Data/Int/WithZero.lean	3	19	['BoltonBailey', 'Ruben-VandeVelde', 'eric-wieser', 'fpvandoorn', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	0-50895 14 hours ago	0-50897 14 hours ago	52-38111 52 days

PRs blocked on a zulip discussion

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
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	61-4028 2 months ago	61-4117 2 months ago	0-23929 6 hours
15649	TpmKranz author:TpmKranz	feat(Computability): introduce Generalised NFA as bridge to Regular Expression	Lays the groundwork for a proof of equivalence of NFA and RE, w.r.t. described language. Actual connection to NFA comes later, after the groundwork for the opposite direction has been laid. Second chunk of #12648 --- - [x] depends on: #15647 [Data.FinEnum.Option unchanged since then] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor awaiting-author	298/0	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib	5	6	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'trivial1711']	nobody	34-77905 1 month ago	34-77914 1 month ago	23-54870 23 days
20648	anthonyde author:anthonyde	feat: formalize regular expression -> εNFA	The file `Computability/RegularExpressionsToEpsilonNFA.lean` contains a formal definition of Thompson's method for constructing an `εNFA` from a `RegularExpression` and a proof of its correctness. --- - [x] depends on: #20644 - [x] depends on: #20645 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	5	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'qawbecrdtey']	nobody	34-77216 1 month ago	34-77851 1 month ago	75-77754 75 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. --- See [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Generalizing.20.60PartialHomeomorph.60.3F) that will probably mean that I close this PR. 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/)	awaiting-zulip t-topology	53/0	Mathlib.lean,Mathlib/Topology/PartialEquiv.lean	2	3	['ADedecker', 'github-actions', 'scholzhannah']	ADedecker assignee:ADedecker	27-15400 27 days ago	31-22176 1 month ago	51-86236 51 days
17458	urkud author:urkud	refactor(Algebra/Group): make `IsUnit` a typeclass	Also change some lemmas to assume `[IsUnit _]` instead of `[Invertible _]`. Motivated by potential non-defeq diamonds in #14986, see also [Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Invertible.20and.20data) I no longer plan to merge this PR, but I'm going to cherry-pick some changes to a new PR before closing this one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-algebra label:t-algebra$	82/72	Mathlib/Algebra/CharP/Invertible.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Units.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/GroupTheory/Submonoid/Inverses.lean,Mathlib/LinearAlgebra/AffineSpace/AffineEquiv.lean,Mathlib/LinearAlgebra/AffineSpace/Combination.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Contraction.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Inversion.lean,Mathlib/LinearAlgebra/CliffordAlgebra/SpinGroup.lean,Mathlib/LinearAlgebra/Eigenspace/Minpoly.lean,Mathlib/NumberTheory/MulChar/Basic.lean,Mathlib/RingTheory/Localization/NumDen.lean,Mathlib/RingTheory/Polynomial/Content.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/Valuation/Basic.lean	26	11	['MichaelStollBayreuth', 'acmepjz', 'eric-wieser', 'github-actions', 'leanprover-bot', 'urkud']	nobody	21-63866 21 days ago	21-84293 21 days ago	0-66650 18 hours
20238	maemre author:maemre	feat(Computability/DFA): Closure of regular languages under some set operations	This shows that regular languages are closed under complement and intersection by constructing DFAs for them. --- Closure under all other operations will be proved when someone adds the proof for DFA<->regular expression equivalence, so they are not part of this PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor awaiting-author	159/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	59	['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'meithecatte', 'urkud']	EtienneC30 assignee:EtienneC30	5-43676 5 days ago	34-77815 1 month ago	48-67492 48 days
25218	kckennylau author:kckennylau	feat(AlgebraicGeometry): Tate normal form of elliptic curves	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip new-contributor t-algebraic-geometry	291/26	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Modular/TateNormalForm.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	5	29	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'github-actions', 'grunweg', 'kckennylau']	nobody	3-79757 3 days ago	7-32169 7 days ago	6-51040 6 days
23658	grunweg author:grunweg	feat: require that real or complex models with corners have convex interior	Follow-up to #18403. --- - [x] depends on: #23657 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-differential-geometry WIP	116/18	Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean	2	5	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'sgouezel']	nobody	2-31025 2 days ago	6-14472 6 days ago	0-9 9 seconds
23929	meithecatte author:meithecatte	feat(Computability/NFA): improve bound on pumping lemma	--- - [x] depends on: #25321 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor	101/10	Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean	2	41	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'meithecatte']	nobody	2-1067 2 days ago	2-1068 2 days ago	34-10595 34 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	266-54938 8 months ago	266-76913 8 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	219-8657 7 months ago	244-83579 8 months ago *	0-0 0 seconds *
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	201-28188 6 months ago	201-28188 6 months ago	33-64877 33 days
8370	eric-wieser author:eric-wieser	refactor(Analysis/NormedSpace/Exponential): remove the `𝕂` argument from `exp`	This argument is still needed for almost all the lemmas, which means it can longer be found by unification. We keep around `expSeries 𝕂 A`, as it's needed for talking about the radius of convergence over different base fields. This is a prerequisite for #8372, as we can't merge the functions until they have the same interface.\ Zulip thread: [#mathlib4 > Real.exp @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Real.2Eexp/near/401602245) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This is started from the mathport output on https://github.com/leanprover-community/mathlib/pull/19244	awaiting-zulip t-analysis merge-conflict	432/387	Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/Analysis/Normed/Algebra/QuaternionExponential.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/NormedSpace/DualNumber.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean	11	29	['YaelDillies', 'eric-wieser', 'girving', 'github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-community-bot-assistant', 'urkud']	nobody	45-69965 1 month ago	57-12195 1 month ago	29-60989 29 days
15654	TpmKranz author:TpmKranz	feat(Computability): language-preserving maps between NFA and RE	Map REs to NFAs via Thompson's construction and NFAs to REs using GNFAs Last chunk of #12648 --- - [ ] depends on: #15651 - [ ] depends on: #15649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict blocked-by-other-PR	985/2	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Data/FinEnum/Option.lean,docs/references.bib	7	3	['github-actions', 'leanprover-community-mathlib4-bot', 'meithecatte']	nobody	34-77865 1 month ago	34-77870 1 month ago	0-179 2 minutes
15651	TpmKranz author:TpmKranz	feat(Computability/NFA): operations for Thompson's construction	Lays the groundwork for a proof of equivalence of RE and NFA, w.r.t. described language. Actual connection to REs comes later, after the groundwork for the opposite direction has been laid. Third chunk of #12648 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	307/5	Mathlib/Computability/NFA.lean	1	15	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte']	nobody	21-14071 21 days ago	21-14072 21 days ago	45-84611 45 days
22361	rudynicolop author:rudynicolop	feat(Computability/NFA): nfa closure properties	Add the closure properties union, intersection and reversal for NFA. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	218/2	Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean	2	90	['EtienneC30', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	EtienneC30 assignee:EtienneC30	21-13145 21 days ago	21-13147 21 days ago	39-67601 39 days
24409	urkud author:urkud	chore(*): fix `nmem` vs `not_mem` names	--- There are some missing/buggy deprecations, I'm going to fix them later today or tomorrow. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip tech debt merge-conflict delegated awaiting-author	317/176	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/Group/Indicator.lean,Mathlib/Algebra/Group/Support.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Order/Group/Indicator.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Support.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/Rademacher.lean,Mathlib/Analysis/Complex/RemovableSingularity.lean,Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Analysis/Convex/Cone/Proper.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Distribution/AEEqOfIntegralContDiff.lean,Mathlib/Data/LocallyFinsupp.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Dynamics/Ergodic/Conservative.lean,Mathlib/Dynamics/Ergodic/Ergodic.lean,Mathlib/Dynamics/Ergodic/Function.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/FreeModule/PID.lean,Mathlib/LinearAlgebra/PID.lean,Mathlib/LinearAlgebra/RootSystem/Base.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Lemmas.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSpace/Indicator.lean,Mathlib/MeasureTheory/Integral/Average.lean,Mathlib/MeasureTheory/Integral/Bochner/Set.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Basic.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean,Mathlib/MeasureTheory/Measure/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Measure/AddContent.lean,Mathlib/MeasureTheory/Measure/DiracProba.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean,Mathlib/MeasureTheory/OuterMeasure/AE.lean,Mathlib/MeasureTheory/SetSemiring.lean,Mathlib/Order/Filter/AtTopBot/CountablyGenerated.lean,Mathlib/Order/Filter/Cocardinal.lean,Mathlib/Order/Filter/Cofinite.lean,Mathlib/Order/Filter/Tendsto.lean,Mathlib/Order/Filter/Ultrafilter/Basic.lean,Mathlib/Probability/Distributions/Uniform.lean,Mathlib/Probability/Kernel/Basic.lean,Mathlib/Probability/Kernel/Composition/MeasureCompProd.lean,Mathlib/RingTheory/AdicCompletion/LocalRing.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/NewtonIdentities.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/Spectrum/Maximal/Localization.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/Topology/Algebra/InfiniteSum/Group.lean,Mathlib/Topology/Algebra/Module/Cardinality.lean,Mathlib/Topology/Algebra/Support.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/ContinuousMap/BoundedCompactlySupported.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/UrysohnsLemma.lean	77	4	['b-mehta', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib-bors']	nobody	7-49043 7 days ago	7-49043 7 days ago	0-55045 15 hours
24396	JovanGerb author:JovanGerb	feat(Order/Defs): refactor in preparation of `to_dual` attribute	When the `to_dual` attribute lands in Mathlib, we will tag many lemmas about order with this tag, which will automatically give us the dual statements. This PR prepares for this by - moving dual declarations closer together - replacing occurrences of `>` and `≥` with `<` and `≤` - consistently applying a new naming convention that helps us to name dual lemmas: we use the keywords `ge` and `gt` in place of `le` and `lt` to indicate that the same pair `a, b` in `a < b` is in the opposite order to the order in which it appeared the first time. - when we have to disambiguate the order of the argument to `<` or `≤`, we sometimes use `gt` or `ge` instead of `lt` or `le`. We also use this to get rid of many primed lemma names. This is a copy of #24376, but it doesn't remove the old lemma names, so doesn't require making changes in >500 files. deprecating these lemmas will be left to a future PR. [#mathlib4 > naming convention for ≤ and <](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/naming.20convention.20for.20.E2.89.A4.20and.20.3C) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-order merge-conflict	248/230	Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/Degree/Domain.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Char.lean,Mathlib/Data/Complex/Order.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Int/Order/Basic.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Factorization/Defs.lean,Mathlib/Data/Nat/Find.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/Num/ZNum.lean,Mathlib/Data/PSigma/Order.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/Data/Sigma/Order.lean,Mathlib/Data/String/Basic.lean,Mathlib/Data/Sum/Order.lean,Mathlib/GroupTheory/MonoidLocalization/Order.lean,Mathlib/NumberTheory/Zsqrtd/Basic.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Booleanisation.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Defs/PartialOrder.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/WithBot.lean,Mathlib/Probability/Martingale/Upcrossing.lean,Mathlib/RingTheory/UniqueFactorizationDomain/Multiplicity.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/SetTheory/Surreal/Basic.lean,Mathlib/Tactic/Linarith/Frontend.lean,MathlibTest/linarith.lean	43	5	['JovanGerb', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant']	bryangingechen assignee:bryangingechen	7-11145 7 days ago	7-11147 7 days ago	5-75236 5 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	313-42770 10 months ago	381-8762 1 year ago	0-0 0 seconds
10721	urkud author:urkud	feat(Order/FunLike): define `PointwiseLE`	- introduce a mixin class `DFunLike.PointwiseLE`, use it to define `DFunLike.instPartialOrder`; - add a generic `DFunLike.orderEmbeddingCoe` - add `DFunLike.PointwiseLE` instances here and there. With this refactor and #13022, I'm going to generalize lemmas like `MeasureTheory.ae_mono` to `OuterMeasureClass`. --- - [x] depends on: #12983 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic t-order merge-conflict	123/50	Mathlib.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/GroupTheory/Congruence.lean,Mathlib/Order/FunLike.lean,Mathlib/Order/Heyting/Hom.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/Bounded.lean,Mathlib/Order/Hom/CompleteLattice.lean,Mathlib/Topology/Order/Hom/Basic.lean	13	48	['YaelDillies', 'dupuisf', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	313-42768 10 months ago	335-23470 11 months ago	64-12826 64 days
8788	FMLJohn author:FMLJohn	feat(Algebra/Module/GradeZeroModule): if `A` is a graded semiring and `M` is a graded `A`-module, then each grade of `M` is a module over the 0-th grade of `A`.	--- - [ ] depends on: #8187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	313-42767 10 months ago	347-30669 11 months ago	0-0 0 seconds
9339	FMLJohn author:FMLJohn	feat (RingTheory/GradedAlgebra/HomogeneousIdeal): given a finitely generated homogeneous ideal of a graded semiring, construct a finite spanning set for the ideal which only contains homogeneous elements	--- - [ ] depends on: #8187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	313-42767 10 months ago	347-30684 11 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	313-42766 10 months ago	335-23470 11 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	313-42766 10 months ago	335-23470 11 months ago	35-56459 35 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	313-42765 10 months ago	335-23470 11 months ago	102-21189 102 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	313-42765 10 months ago	335-23470 11 months ago	83-76369 83 days
10629	madvorak author:madvorak	feat: List.cons_sublist_append_iff_right	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	11/0	Mathlib/Data/List/Basic.lean	1	1	['eric-wieser']	nobody	299-36310 9 months ago	299-36310 9 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	294-85734 9 months ago	325-21094 10 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	294-85555 9 months ago	335-23470 11 months ago	1-84718 1 day
11964	adamtopaz author:adamtopaz	feat: The functor of points of a scheme	We construct the functor of points functor, and prove that it's full and faithful. --- - [ ] depends on: #11947 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-category-theory merge-conflict	210/0	Mathlib.lean,Mathlib/AlgebraicGeometry/FunctorOfPoints.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean	3	4	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	294-85414 9 months ago	335-23470 11 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	294-85313 9 months ago	335-23470 11 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	294-20067 9 months ago	299-36309 9 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	262-8623 8 months ago	262-8623 8 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	252-57406 8 months ago	252-57406 8 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	242-86211 7 months ago	335-23470 11 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	215-52872 7 months ago	215-52872 7 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	215-51775 7 months ago	215-51775 7 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	203-9053 6 months ago	203-9053 6 months ago	4-31794 4 days
19212	Julian author:Julian	feat(LinearAlgebra): add a variable_alias for VectorSpace	Taken directly from the variable_alias docs. Zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/why.20.5Bvariable_alias.5D.20attribute.20is.20not.20used.20in.20Mathlib.3F --- This is the first actual variable alias added to mathlib. I haven't reviewed variable_alias fully, but it seems like there's at least 3 ways they could be distributed in Mathlib: * alongside whatever subfolder they "belong to" (which is what I've tentatively done here) * In a file called `Aliases` somewhere near the thing they alias (which seems less discoverable to me) * In a single file, a la `Mathlib.TrainingWheels` (with some less playful name) which is meant to define a bunch of more "friendly" aliases all in one place. I kind of like the idea of the third thing as a future module but perhaps it can be synthesized if/when there are more aliases? For now as I say I've done the first one, but please let me know if someone prefers something else. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	25/0	Mathlib.lean,Mathlib/LinearAlgebra/VectorSpace.lean,scripts/noshake.json	3	10	['Julian', 'PieterCuijpers', 'github-actions', 'urkud']	nobody	195-29627 6 months ago	195-29627 6 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	193-5704 6 months ago	193-5704 6 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	181-57773 5 months ago	181-57773 5 months ago	31-75259 31 days
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	178-19257 5 months ago	178-19258 5 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	175-21786 5 months ago	175-21789 5 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	147-18579 4 months ago	147-18579 4 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	145-5609 4 months ago	145-5609 4 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	144-27126 4 months ago	144-27126 4 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	132-29866 4 months ago	132-29866 4 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	112-19326 3 months ago	112-19326 3 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	110-54008 3 months ago	110-54008 3 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	106-12844 3 months ago	106-12844 3 months ago	27-75210 27 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	98-15949 3 months ago	225-32457 7 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	98-11736 3 months ago	98-11736 3 months 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	96-15887 3 months ago	96-15887 3 months ago	16-76141 16 days
22660	Ruben-VandeVelde author:Ruben-VandeVelde	chore: follow naming convention around Group.IsNilpotent	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	133/67	Mathlib/GroupTheory/Frattini.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/SpecificGroups/ZGroup.lean	3	1	['github-actions']	nobody	84-38142 2 months ago	84-38142 2 months 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	83-29376 2 months ago	83-29376 2 months ago	32-26420 32 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	64-82294 2 months ago	67-49254 2 months ago	43-68322 43 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	63-80879 2 months ago	63-80879 2 months 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	63-80341 2 months ago	63-80343 2 months 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	63-78056 2 months ago	63-78056 2 months ago	30-8337 30 days
23411	PatrickMassot author:PatrickMassot	chore: remove finiteness from Order.Filter.Lift	Co-authored-by: Anatole Dedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	longest-pole t-topology merge-conflict	48/21	Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Order/Filter/Lift.lean,Mathlib/Order/Filter/SmallSets.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Basic.lean	7	4	['Vierkantor', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	62-38370 2 months ago	62-57939 2 months ago	10-21608 10 days
21488	imbrem author:imbrem	feat(CategoryTheory/Monoidal): premonoidal categories	Add support for premonoidal categories --- Still want to add support for: - Premonoidal braided/symmetric categories - The monoidal coherence theorem, which I've already ported in my `discretion` library - The `coherence` tactic, which should work fine for premonoidal categories too but wanted to get this in front of reviewers ASAP to make sure my general approach was alright [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory merge-conflict	900/361	Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/CoherenceLemmas.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,MathlibTest/StringDiagram.lean	21	9	['YaelDillies', 'github-actions', 'grunweg', 'imbrem', 'kim-em', 'leanprover-community-bot-assistant']	nobody	61-24289 2 months ago	61-24290 2 months ago	58-20339 58 days
21525	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Prelim)	This PR defines the basic preliminaries for defining locally cartesian closed categories (LCCCs). In particular, using the calculus of mates we define certain natural isomorphisms involving `Over.star` and `Over.pullback` which will be crucial in defining the right adjoint to the pullback functor in the development of LCCCs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict	338/24	Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Galois/Examples.lean	3	13	['b-mehta', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'sinhp']	nobody	61-24287 2 months ago	61-24289 2 months ago	43-83249 43 days
16314	FR-vdash-bot author:FR-vdash-bot	chore(Data/Quot): deprecate `ind*'` APIs	--- - [x] depends on: #16264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	247/287	Counterexamples/CliffordAlgebraNotInjective.lean,Mathlib/Algebra/Colimit/Module.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/CategoryTheory/ConnectedComponents.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Computability/Reduce.lean,Mathlib/Computability/Tape.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/Multiset/MapFold.lean,Mathlib/Data/Multiset/ZeroCons.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/FieldTheory/Fixed.lean,Mathlib/GroupTheory/Complement.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/Hom.lean,Mathlib/GroupTheory/Coset/Basic.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/GroupTheory/PresentedGroup.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/GroupTheory/SchurZassenhaus.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Category/PartOrd.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Hilbert90.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Functoriality.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Valuation/Quotient.lean,Mathlib/Topology/Algebra/Group/TopologicalAbelianization.lean,Mathlib/Topology/Algebra/InfiniteSum/Module.lean,Mathlib/Topology/Separation/Basic.lean	65	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	55-49253 1 month ago	55-49255 1 month 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	55-47427 1 month ago	55-47429 1 month 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	55-41568 1 month ago	55-41570 1 month 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	54-80546 1 month ago	303-32476 9 months ago	4-79214 4 days
20567	grunweg author:grunweg	feat(Cache): two small features	- add an informational message to the get command (when run without arguments): when more than 80% of all cache files present were not used in the last command, tell the user about the `clean` command --- - [ ] depends on #20568 (for the first feature) - [ ] TODO: re-design this feature and the clean command: if there are N local copies of mathlib, cache should have a pointer to all of them - to avoid clearing all N-1 from inside the last local copy [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	38/2	Cache/Main.lean	1	11	['Julian', 'arthurpaulino', 'fpvandoorn', 'github-actions', 'grunweg']	nobody	52-84649 1 month ago	52-84649 1 month ago	1-17369 1 day
23859	urkud author:urkud	feat(Topology/../Order/Field): generalize to `Semifield`	.. from a linear ordered field to a linear ordered semifield--- - [ ] depends on: #23857 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	245/219	Mathlib/Algebra/Order/Group/Pointwise/Interval.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Topology/Algebra/Order/Field.lean,Mathlib/Topology/Order/Basic.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	48-37163 1 month ago	48-37166 1 month ago	0-265 4 minutes
23810	b-reinke author:b-reinke	chore(Order/Interval): generalize succ/pred lemmas to partial orders	Many lemmas in `Mathlib/Order/Interval/Set/SuccPred.lean`and `Mathlib/Order/Interval/Finset/SuccPred.lean` also work for partial orders. They are generalized in this PR by introducing different sections for `PartialOrder` and `LinearOrder` assumptions in the respective files. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	231/89	Mathlib/Order/Interval/Finset/SuccPred.lean,Mathlib/Order/Interval/Set/SuccPred.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	46-13938 1 month ago	46-13940 1 month ago	16-29623 16 days
24285	madvorak author:madvorak	chore(Algebra/*-{Category,Homology}): remove unnecessary universe variables	Discussions: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Call.20for.20help.3A.20technical.2F.20organisational.20debt/with/513620128 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Algebra.20and.20.60Type.60/with/513558902 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Task.2026.3A.20Replace.20Type.20u.20by.20Type.20wherever.20possible/with/513592993 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	542/916	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Field.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Central/Basic.lean,Mathlib/Algebra/Central/Defs.lean,Mathlib/Algebra/Central/TensorProduct.lean,Mathlib/Algebra/CharP/Pi.lean,Mathlib/Algebra/CharP/Quotient.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Finsupp.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/Algebra/Field/MinimalAxioms.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/FreeNonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Finite.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Invertible/Defs.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/TypeTags/Finite.lean,Mathlib/Algebra/Group/TypeTags/Hom.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/Group/WithOne/Basic.lean,Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Pi.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/NeZero.lean,Mathlib/Algebra/Lie/Abelian.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/CartanMatrix.lean,Mathlib/Algebra/Lie/CartanSubalgebra.lean,Mathlib/Algebra/Lie/Character.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/DirectSum.lean,Mathlib/Algebra/Lie/Free.lean,Mathlib/Algebra/Lie/Ideal.lean,Mathlib/Algebra/Lie/IdealOperations.lean,Mathlib/Algebra/Lie/Matrix.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/NonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Solvable.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/Algebra/Lie/UniversalEnveloping.lean,Mathlib/Algebra/Module/Basic.lean,Mathlib/Algebra/Module/CharacterModule.lean,Mathlib/Algebra/Module/DedekindDomain.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/Equiv/Opposite.lean,Mathlib/Algebra/Module/Lattice.lean,Mathlib/Algebra/Module/LinearMap/Basic.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/MinimalAxioms.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Module/Opposite.lean,Mathlib/Algebra/Module/Pi.lean,Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/CommRing.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean	182	22	['erdOne', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'madvorak', 'mattrobball']	nobody	46-2635 1 month ago	46-2636 1 month ago	2-12022 2 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']	kbuzzard assignee:kbuzzard	45-2205 1 month ago	unknown	unknown
24354	grunweg author:grunweg	chore(HasFiniteIntegral): rename three lemmas	Discovered in #24343. --- - [ ] depends on: #24343 (to avoid merge conflicts) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict	108/30	Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	41-7039 1 month ago	41-7040 1 month ago	0-4604 1 hour
13649	FR-vdash-bot author:FR-vdash-bot	chore: redefine `Nat.div2` `Nat.bodd`	The new definitions are faster than the old ones. `Nat.binaryRec` will be moved to batteries (https://github.com/leanprover-community/batteries/pull/799) or core (https://github.com/leanprover/lean4/pull/3756), so relevant contents are moved to a new file temporarily. --- - [x] depends on: #15567 - [x] depends on: #19666 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	63/88	Mathlib/Computability/Primrec.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Size.lean,Mathlib/Logic/Denumerable.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Nat.lean	8	15	['FR-vdash-bot', 'digama0', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	digama0 assignee:digama0	37-72585 1 month ago	37-72587 1 month ago	87-51692 87 days
14023	mattrobball author:mattrobball	perf(RingTheory.OreLocalization): make data irreducible	We generally do not want to unfold operations passing through `Quotient` if we can avoid it for performance reasons. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	43/32	Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Ring.lean	3	5	['github-actions', 'grunweg', 'leanprover-bot', 'mattrobball']	nobody	37-44718 1 month ago	345-34541 11 months ago	0-0 0 seconds
4979	mhk119 author:mhk119	doc(Data/Nat/Bitblast): initial commit	Initial commit of Bitblast.lean where we prove equivalence of bitblast unsigned less than and bitblast addition. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	202/4	Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Pow.lean	3	49	['ChrisHughes24', 'digama0', 'goens', 'grunweg', 'j-loreaux', 'kim-em', 'mhk119']	nobody	37-44420 1 month ago	37-44420 1 month ago	7-68358 7 days
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.	merge-conflict	345/345	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/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,Mathlib/Data/Real/Pi/Irrational.lean	171	9	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	nobody	37-5710 1 month ago	37-5711 1 month ago	11-65652 11 days
23546	JovanGerb author:JovanGerb	feat(LinearAlgebra/AffineSpace/AffineSubspace): rename `AffineSubspace.mk'` to `Submodule.shift`	In addition to renaming, I've refactored the code a bit: - `mem_mk'_iff_vsub_mem` was obsolete since it was the same as `mem_mk'`, so I removed it (this is due to a change in the definition I made recently) - I added a nonempty instance for `shift` - I added a simp lemma that `shift` isn't equal to `⊥` (the empty affine subspace). I need this for the next point. - Edit: I'll leave this for a later PR. ~I proved a simp lemma that a `shift` is parallel to a `shift` if and only if the linear subspaces are the same.~ - I renamed `mk'_eq` to `shift_direction_eq_self `. - I renamed `eq_or_eq_secondInter_of_mem_mk'_span_singleton_iff_mem` to `eq_or_eq_secondInter_iff_mem_of_mem_shift_span_singleton`. I think it is better to put the `of_mem_mk'_span_singleton` at the end of the name. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry merge-conflict	128/99	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Geometry/Euclidean/Basic.lean,Mathlib/Geometry/Euclidean/MongePoint.lean,Mathlib/Geometry/Euclidean/PerpBisector.lean,Mathlib/Geometry/Euclidean/Sphere/SecondInter.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean	7	4	['JovanGerb', 'github-actions', 'leanprover-community-bot-assistant']	nobody	36-19167 1 month ago	36-19168 1 month ago	26-25420 26 days
24483	Parcly-Taxel author:Parcly-Taxel	chore: delete >6 month old deprecations (2024-10)	See #24271 for the general pattern of regex used in the first (automated) commit. The date range used in this PR is `2024-10-..`.	tech debt merge-conflict	2/1182	Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/AlgebraicGeometry/Morphisms/ClosedImmersion.lean,Mathlib/AlgebraicGeometry/Morphisms/Preimmersion.lean,Mathlib/AlgebraicGeometry/Restrict.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Comp.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/LineDeriv/Basic.lean,Mathlib/Analysis/Complex/ReImTopology.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean,Mathlib/CategoryTheory/Limits/Preserves/Limits.lean,Mathlib/CategoryTheory/Sites/Canonical.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/List/Flatten.lean,Mathlib/Data/List/SplitBy.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/Defs.lean,Mathlib/Data/Nat/Factorization/PrimePow.lean,Mathlib/Data/Set/Subset.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Algebra.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/AEStronglyMeasurable.lean,Mathlib/MeasureTheory/Measure/DiracProba.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/MeasureTheory/Measure/ProbabilityMeasure.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/Order/InitialSeg.lean,Mathlib/Order/WellFounded.lean,Mathlib/Probability/Density.lean,Mathlib/RingTheory/Finiteness/Cardinality.lean,Mathlib/RingTheory/Finiteness/Ideal.lean,Mathlib/RingTheory/Jacobson/Ring.lean,Mathlib/RingTheory/Localization/Cardinality.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/Spectrum/Prime/TensorProduct.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/SetTheory/Game/Nim.lean,Mathlib/SetTheory/PGame/Algebra.lean,Mathlib/Tactic/FunProp/ContDiff.lean,Mathlib/Topology/AlexandrovDiscrete.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Constructions/DomMulAct.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Group/CompactOpen.lean,Mathlib/Topology/Algebra/Group/Quotient.lean,Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/Multilinear/Topology.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakBilin.lean,Mathlib/Topology/Algebra/Monoid.lean,Mathlib/Topology/Algebra/MulAction.lean,Mathlib/Topology/Algebra/Ring/Ideal.lean,Mathlib/Topology/Algebra/SeparationQuotient/Section.lean,Mathlib/Topology/Algebra/StarSubalgebra.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Category/Profinite/Nobeling/Induction.lean,Mathlib/Topology/Category/TopCat/EffectiveEpi.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/CompactOpen.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Compactness/Lindelof.lean,Mathlib/Topology/Compactness/LocallyCompact.lean,Mathlib/Topology/Compactness/SigmaCompact.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Connected/Clopen.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Connected/TotallyDisconnected.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Bounded/Basic.lean,Mathlib/Topology/ContinuousMap/ContinuousMapZero.lean,Mathlib/Topology/ContinuousMap/Sigma.lean,Mathlib/Topology/ContinuousMap/T0Sierpinski.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/Defs/Induced.lean	139	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	35-41124 1 month ago	35-41126 1 month ago	4-54091 4 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	13	['YaelDillies', 'github-actions', 'grunweg', 'vihdzp']	nobody	33-79798 1 month ago	80-58425 2 months ago	36-50134 36 days
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	225/12	Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Topology/Algebra/Module/Basic.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	31-80975 1 month ago	unknown	unknown
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	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	31-13249 1 month ago	31-13252 1 month ago	0-562 9 minutes
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	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	31-13200 1 month ago	31-13202 1 month ago	0-344 5 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 merge-conflict	186/0	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Restricted.lean	2	18	['Paul-Lez', 'WilliamCoram', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	26-33783 26 days ago	26-33785 26 days ago	48-76736 48 days
24590	smmercuri author:smmercuri	chore: make `Valuation.Completion` a `def` and refactor more of `AdicValuation.lean`	The main purpose of this PR is to resolve timeout issues encountered in FLT following the refactor of `HeightOneSpectrum.adicCompletion` to use the `WithVal` type synonym. The proposed fix in this PR is to replace `abbrev` with `def` in `Valuation.Completion`. Tested in FLT and this removes the timeout issue. Also refactor as much API as possible from `HeightOneSpectrum.adicCompletion` to `Valuation.Completion`. See #22488 for a previous attempt at fixing the problem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT merge-conflict	162/81	Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	5	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'smmercuri']	nobody	22-78761 22 days ago	22-78763 22 days ago	13-35725 13 days
24245	JovanGerb author:JovanGerb	feat(Geometry/Euclidean/SignedDist): `signedDist` between two points	This PR defines `signedDist`, the signed distance between two points. It redefines `signedInfDist` so that it uses `signedDist`. The motivation is to use this in IMO2020Q6. Additionally this definition will be useful for properly reasoning about the power of a point [#mathlib4 > Signed distance between points](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Signed.20distance.20between.20points) some comments: * should `signedDistLinear` be `private`? * should `signedDist` and `signedInfDist` be made continuous bunled maps in this PR? * I'm not too happy about the hypothesis in `signedDist_congr (h : ∃ r > (0 : ℝ), r • v = w)`. This relationship between `v` and `w` is a symmetric one that should have some API around it, similar to `SameRay`. It could also be spelled as `(ℝ≥0 ∙ v) = ℝ≥0 ∙ w` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry merge-conflict	206/23	Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Geometry/Euclidean/SignedDist.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean	3	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	18-84326 18 days ago	18-84328 18 days ago	30-61949 30 days
22837	joneugster author:joneugster	feat(Data/Set/Basic): add subset_iff and not_mem_subset_iff	Add `Set.subset_iff` for consistent API with `Finset.subset_iff`. Add `Set.not_mem_subset_iff` and `Finset.not_mem_subset_iff`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-data merge-conflict	9/0	Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Set/Basic.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant']	nobody	15-22167 15 days ago	15-22169 15 days ago	30-35190 30 days
21476	grunweg author:grunweg	feat(lint-style): enable running on downstream projects	Enable lint-style to run on downstream projects, by making the following modifications: - allow passing an explicit list of libraries to lint: if nothing is passed, it lints `Mathlib`, `Archive` and `Counterexamples` (as before); otherwise, it lints precisely the passed modules - only check init imports, undocumented scripts and the errors from `lint-style.py` when linting Mathlib - make the style exceptions file configurable and optional: using the `nolints-file` flag, the exceptions file can be configured. If the flag is omitted, we try to find a file at `scripts/nolints-style.txt` --- and otherwise proceed with no style exceptions. This means mathlib can continue unchanged, and downstream projects can either add an explicit exceptions file, or proceed without any exceptions. After this PR, one should be able to run lint-style on a downstream project by `lake exe lint-style ProjectName`. Prompted by [this zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/lint-style.20for.20downstream.20libraries). --- - [ ] depends on: #24570 - [ ] depends on: #24953 (I did not test the last part.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	58/19	Mathlib/Tactic/Linter/TextBased.lean,scripts/lint-style.lean	2	19	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	joneugster assignee:joneugster	14-27655 14 days ago	14-27658 14 days ago	43-17409 43 days
23349	BGuillemet author:BGuillemet	feat: add LocallyLipschitzOn.lipschitzOnWith_of_isCompact and two small lemmas about Lipschitz functions	Main feat (in Mathlib/Topology/EMetricSpace/Basic.lean): if a function `f` from an extended pseudometric space to a pseudometric space is locally Lipschitz on a compact subset `s`, then `f` is Lipschitz on `s`. The theorem is true only when the codomain of `f` is a pseudometric space, so it needs imports from Mathlib/Topology/MetricSpace. Other small feat (in Mathlib/Analysis/Calculus/ContDiff/RCLike.lean): a function that is continuously differentiable on an open subset is locally Lipschitz on this subset. --- - [ ] depends on: #22890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-topology merge-conflict	59/4	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	PatrickMassot assignee:PatrickMassot	13-9385 13 days ago	13-9387 13 days ago	35-30364 35 days
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	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	12-77352 12 days ago	12-77354 12 days ago	0-0 0 seconds
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 merge-conflict	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	9	['adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	11-22480 11 days ago	11-22482 11 days ago	51-69759 51 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 merge-conflict label:t-algebra$	18/20	Mathlib/RingTheory/Kaehler/JacobiZariski.lean	1	38	['chrisflav', 'erdOne', 'github-actions', 'grunweg', 'kbuzzard', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	7-24653 7 days ago	7-24655 7 days ago	125-81208 125 days
25138	chrisflav author:chrisflav	chore(RingTheory): remove unnecessary `toRingHom` coercions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	32/40	Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/Kaehler.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/Unramified/Basic.lean	9	5	['chrisflav', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	7-10781 7 days ago	7-10783 7 days ago	9-64502 9 days
21182	joneugster author:joneugster	fix(Util/CountHeartbeats): move elaboration in #count_heartbeats inside a namespace	Currently the `#count_heartbeat` linter reported the heartbeats until it concluded `error: [declaration] has already been declared` instead of re-elaborating the declaration. --- [Zulip report](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/count_heartbeats.20for.20all.20declarations.20in.20a.20file.3F/near/496303652) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	72/5	Mathlib/Util/CountHeartbeats.lean,MathlibTest/CountHeartbeats.lean	2	17	['adomani', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib-bors']	adomani assignee:adomani	6-38133 6 days ago	6-38134 6 days ago	64-19141 64 days
24877	smmercuri author:smmercuri	feat: predicates for extensions of complex embeddings	If `L/K`, `ψ : K →+* ℂ`, `φ : L →+* ℂ` we define three predicates asserting ways that `φ` can extend `ψ`. - `IsExtension ψ φ` : the restriction of `φ` to `K` is `ψ`. - `IsMixedExtension ψ φ` : the restriction of `φ` to `K` is `ψ`, `ψ` has real image while `φ` has complex image. - `IsUnmixedExtension ψ φ`: the restriction of `φ` to `K` is `ψ`, `ψ` has real image if and only if `φ` has real image. `IsMixedExtension` and `IsUnmixedExtension` are the `ComplexEmbedding` analogues to ramified and unramified infinite places. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory merge-conflict	91/0	Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean	1	7	['github-actions', 'leanprover-community-bot-assistant', 'smmercuri', 'xroblot']	nobody	5-7757 5 days ago	5-7759 5 days ago	21-40253 21 days
7596	alreadydone author:alreadydone	feat: covering maps from properly discontinuous actions and discrete subgroups	--- - [x] depends on: #23236 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-topology merge-conflict	351/21	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Pointwise.lean,Mathlib/Topology/Covering/AddCircle.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Galois.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Instances/AddCircle.lean	9	17	['ADedecker', 'alreadydone', 'digama0', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	3-27315 3 days ago	3-27317 3 days ago	48-80629 48 days
25340	dupuisf author:dupuisf	chore(Analysis/Convex): move files pertaining to convex/concave functions to their own folder	This PR creates a new folder under `Analysis/Convex` called `Analysis/Convex/Function`, which includes files that are mostly or entirely about convex/concave functions (as opposed to convex sets). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry merge-conflict	4264/4155	Mathlib.lean,Mathlib/Analysis/Convex/Continuous.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convex/Extrema.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Function/Basic.lean,Mathlib/Analysis/Convex/Function/Continuous.lean,Mathlib/Analysis/Convex/Function/Deriv.lean,Mathlib/Analysis/Convex/Function/Extrema.lean,Mathlib/Analysis/Convex/Function/Integral.lean,Mathlib/Analysis/Convex/Function/Jensen.lean,Mathlib/Analysis/Convex/Function/Mul.lean,Mathlib/Analysis/Convex/Function/Piecewise.lean,Mathlib/Analysis/Convex/Function/Quasiconvex.lean,Mathlib/Analysis/Convex/Function/Slope.lean,Mathlib/Analysis/Convex/Function/Strong.lean,Mathlib/Analysis/Convex/Integral.lean,Mathlib/Analysis/Convex/Jensen.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/Piecewise.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Convex/SpecificFunctions/Basic.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/Convex/Strong.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Log/NegMulLog.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/MeasureTheory/Measure/Decomposition/IntegralRNDeriv.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean	34	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	2-32212 2 days ago	2-32214 2 days ago	6-40169 6 days
25012	urkud author:urkud	refactor(*): migrate from `Matrix.toLin'` to `Matrix.mulVecLin`	or `Matrix.mulVec` whenever we don't need the `LinearEquiv.symm` part. See [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Matrix.2EtoLin'.20vs.20Matrix.2EmulVecLin/with/515188548). It makes sense to have only one normal form, and `Matrix.toLin'` has an extra `DecidableEq` assumption. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	154/122	Mathlib/Algebra/Lie/Matrix.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Rank.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Finsupp/VectorSpace.lean,Mathlib/LinearAlgebra/FreeModule/Finite/Matrix.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Minpoly.lean,Mathlib/LinearAlgebra/Matrix/Diagonal.lean,Mathlib/LinearAlgebra/Matrix/Gershgorin.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Matrix/ToLinearEquiv.lean,Mathlib/LinearAlgebra/UnitaryGroup.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean	21	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	1-27046 1 day ago	1-27048 1 day ago	15-74981 15 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 merge-conflict	5/4	Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Data/Int/WithZero.lean	3	19	['BoltonBailey', 'Ruben-VandeVelde', 'eric-wieser', 'fpvandoorn', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	0-50895 14 hours ago	0-50897 14 hours ago	52-38111 52 days
25264	linesthatinterlace author:linesthatinterlace	feat: add elementary lifts for `OneHom`, `MulHom`, `MonoidHom` and `RingHom`.	Adds `liftRight` and `liftLeft` constructions for `OneHom`, `MulHom` and `MonoidHom`. --- The plan is to implement `Units.liftRight` and possibly other "lift"-style monoid constructions (e.g. `liftOfRightInverse`) using these. This should probably be in a future PR but I could consider adding it to this one once the initial changes are stable. Note that these constructions are added relatively deep as they do not need much in the way of pre-requisites. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	412/11	Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Ring/Hom/Basic.lean,Mathlib/Algebra/Ring/Hom/Defs.lean	4	7	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	0-5787 1 hour ago	0-5789 1 hour ago	12-4669 12 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	308-17782 10 months ago	313-11447 10 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	298-35158 9 months ago	298-35158 9 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	294-19535 9 months ago	396-21620 1 year 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	294-19410 9 months ago	298-32336 9 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	280-81302 9 months ago	312-40561 10 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	262-41519 8 months ago	267-38237 8 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	258-20363 8 months ago	258-20481 8 months ago	26-39463 26 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	230-13904 7 months ago	230-13904 7 months ago	31-44440 31 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	203-16688 6 months ago	258-18608 8 months ago	41-7533 41 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	172-85146 5 months ago	173-33855 5 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	140-38439 4 months ago	140-38439 4 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	140-25204 4 months ago	141-26157 4 months ago	2-77310 2 days
19582	yu-yama author:yu-yama	feat(GroupExtension/Abelian): define `OfMulDistribMulAction.equivH2`	Mainly defines: - `structure GroupExtension.OfMulDistribMulAction N G [MulDistribMulAction G N]`: group extensions of `G` by `N` where the multiplicative action of `G` on `N` is the conjugation - `structure GroupExtension.OfMulDistribMulActionWithSection N G [MulDistribMulAction G N]`: group extensions with specific choices of sections - `def GroupExtension.OfMulDistribMulAction.equivH2`: a bijection between the equivalence classes of group extensions and $H^2 (G, N)$ - [x] depends on: #20802 (split PR: contains changes to the `Defs` file) - [x] depends on: #20998 (split PR: mainly adds the `Basic` file) - [ ] depends on: #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	116-3145 3 months ago	116-6919 3 months ago	43-23183 43 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	109-77367 3 months ago	114-58963 3 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	109-76446 3 months ago	109-76446 3 months ago	13-33168 13 days
22302	CharredLee author:CharredLee	feat: add `CategoryTheory.Topos.Power`	This is a continuation of #21281 with the end goal of defining topoi in Mathlib. It introduces the notion of a power object in a category with a subobject classifier, which is a special case of an internal hom. The definition `HasPowerObjects C` contained in this PR is all that remains before `IsTopos C` can be defined. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	312/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Power.lean	2	2	['github-actions', 'joelriou']	b-mehta assignee:b-mehta	103-77642 3 months ago	103-78769 3 months ago	0-1528 25 minutes
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	98-31875 3 months ago	101-27347 3 months ago	0-6513 1 hour
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	84-38789 2 months ago	84-38789 2 months ago	20-81771 20 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	81-30405 2 months ago	81-30413 2 months ago	1-58489 1 day
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	68-52022 2 months ago	69-39345 2 months ago	32-33842 32 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	63-21305 2 months ago	73-15782 2 months 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	62-54115 2 months ago	62-54115 2 months 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	62-19772 2 months ago	62-19793 2 months ago	84-10469 84 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	59-20722 1 month ago	59-20723 1 month ago	0-2389 39 minutes
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	53-37204 1 month ago	53-83825 1 month ago	13-19789 13 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	52-84002 1 month ago	52-84002 1 month ago	4-24257 4 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 awaiting-author	33/0	Mathlib/CategoryTheory/Limits/Types/Colimits.lean	1	4	['github-actions', 'joelriou', 'robertmaxton42']	nobody	49-15397 1 month ago	49-15397 1 month ago	8-28043 8 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 WIP	74/3	Mathlib.lean,Mathlib/Control/Lawful.lean,Mathlib/Control/Monad/AlternativeMonad.lean	3	8	['dtumad', 'eric-wieser', 'github-actions', 'quangvdao']	nobody	44-55296 1 month ago	44-55450 1 month ago	1-20563 1 day
24394	wwylele author:wwylele	feat(Analysis/Asymptotics): Add filter operation theorems to `IsEquivalent`	These are simply restating the corresponding theorems for `isLittleO`, but adding them provides better discovery when one is not familiar with how `IsEquivalent` is defined. I tagged `isEquivalent_map` as `@[simp]` because all of `isBigOWith/isBigO/isLittleO_map` are tagged, but I am not sure if this appropriate. Please let me know if I should remove the tag --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	13/0	Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean	1	1	['github-actions']	nobody	44-3314 1 month ago	44-3314 1 month ago	44-3373 44 days
22809	b-reinke author:b-reinke	feat: Category algebras and path algebras	This PR defines the category algebra of a linear category and path algebras of quivers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra t-category-theory WIP label:t-algebra$	218/0	Mathlib/Algebra/Ring/Assoc.lean,Mathlib/CategoryTheory/Linear/CategoryAlgebra.lean,Mathlib/Combinatorics/Quiver/PathAlgebra.lean,Mathlib/Data/DFinsupp/BigOperators.lean	4	2	['b-reinke', 'github-actions']	nobody	37-45186 1 month ago	37-45186 1 month ago	0-0 0 seconds
24527	matthewjasper author:matthewjasper	feat(Topology/Algebra/Module): Add more theorems for IsModuleTopology	Add theorems that surjective linear maps to the module topology are open. Add IsModuleTopology instance for quotients. Add IsModuleTopology instance for finite dimensional T2 vector spaces over a complete normed field and use it to shorten some proofs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra t-topology label:t-algebra$	48/24	Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/ModuleTopology.lean	2	5	['erdOne', 'github-actions', 'matthewjasper']	nobody	37-13321 1 month ago	37-30391 1 month ago	38-85090 38 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/)	awaiting-zulip t-computability new-contributor awaiting-author	298/0	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib	5	6	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'trivial1711']	nobody	34-77905 1 month ago	34-77914 1 month ago	23-54870 23 days
20648	anthonyde author:anthonyde	feat: formalize regular expression -> εNFA	The file `Computability/RegularExpressionsToEpsilonNFA.lean` contains a formal definition of Thompson's method for constructing an `εNFA` from a `RegularExpression` and a proof of its correctness. --- - [x] depends on: #20644 - [x] depends on: #20645 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	5	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'qawbecrdtey']	nobody	34-77216 1 month ago	34-77851 1 month ago	75-77754 75 days
24361	Hagb author:Hagb	feat(Data/Finsupp/MonomialOrder): `0 ≤ a` where `a : m.syn`	`simp` would be able to solve it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor easy	3/0	Mathlib/Data/Finsupp/MonomialOrder.lean	1	1	['github-actions']	nobody	33-42488 1 month ago	33-42488 1 month ago	45-44165 45 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	2	['github-actions', 'grunweg']	mariainesdff assignee:mariainesdff	32-46491 1 month ago	52-14174 1 month ago	52-14228 52 days
24637	michaellee94 author:michaellee94	feat(Analysis/ODE/MaximalSolution): Existence of maximal solutions for ODE meeting Picard-Lindelöf conditions	Add existence proof for maximal solution of ODE using Picard-Lindelöf and a uniqueness theorem using Grönwall's lemma. --- - [ ] depends on: #20704 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis blocked-by-other-PR	746/1	Mathlib.lean,Mathlib/Analysis/ODE/MaximalSolution.lean,docs/undergrad.yaml	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'michaellee94']	nobody	31-70108 1 month ago	32-6233 1 month ago	2-10512 2 days
22314	shetzl author:shetzl	feat: add leftmost derivations for context-free grammars	Leftmost derivations are often easier to reason about than arbitrary derivations. This PR adds leftmost variants of Rewrites, Produces and Derives to the existing definition of context-free grammars and proves that a string of terminals can be derived iff it can be leftmost derived. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	383/0	Mathlib.lean,Mathlib/Computability/LeftmostDerivation.lean	2	54	['YaelDillies', 'github-actions', 'madvorak', 'shetzl']	YaelDillies assignee:YaelDillies	31-36180 1 month ago	31-36180 1 month ago	72-3718 72 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	816/2	Mathlib.lean,Mathlib/Algebra/Lie/Derivation/AdjointAction.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LieAlgebra/Basic.lean,Mathlib/Tactic/LieAlgebra/LieRingNF.lean,Mathlib/Util/AtomM.lean,MathlibTest/lie_ring.lean,scripts/noshake.json	8	16	['bryangingechen', 'eric-wieser', 'faenuccio', 'github-actions', 'grunweg', 'ocfnash', 'siddhartha-gadgil', 'xyzw12345']	robertylewis assignee:robertylewis	31-30093 1 month ago	106-61592 3 months ago	106-61583 106 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']	Ruben-VandeVelde assignee:Ruben-VandeVelde	31-28220 1 month ago	56-29490 1 month ago	56-29544 56 days
24008	meithecatte author:meithecatte	chore(EpsilonNFA): replace manual lemmas with @[simps]	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	2/24	Mathlib/Computability/EpsilonNFA.lean	1	2	['YaelDillies', 'github-actions', 'urkud']	nobody	29-37044 29 days ago	29-37044 29 days ago	27-52316 27 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	15	['callesonne', 'chrisflav', 'github-actions']	nobody	28-82913 28 days ago	68-14237 2 months ago	8-4256 8 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$	83/0	Mathlib/Algebra/DirectSum/Decomposition.lean	1	9	['eric-wieser', 'github-actions', 'pelicanhere']	eric-wieser assignee:eric-wieser	28-41099 28 days ago	86-37917 2 months ago	86-37959 86 days
24372	Hagb author:Hagb	feat(Tactic/SimpIntro): add support for introducing non-propositions	`simp_intro` would be able to introduce non-propositions. The previous `simp_intro` tactic cannot solve some statement that can be solved by applying `intro` and `simp` like `simp_intro`. For example, the following one can be solved like this ```lean example (r : Nat → Prop) : (∀ x, x > 0 → r x) → ∀ y z, y = 0 → z > y → r z := by simp intro hr try simp at hr -- does nothing try simp [hr] -- does nothing intro y z try simp [hr] -- does nothing intro hy try simp [hr] at hy -- does nothing simp [hr, hy] intro hyz try simp [hr, hy] at hyz simp [hr, hy, hyz] -- accomplish the goal successfully ``` while the previous `simp_intro` cannot introduce `y` and `z` here. ```lean example (r : Nat → Prop) : (∀ x, x > 0 → r x) → ∀ y z, y = 0 → z > y → r z := by /- the previous `simp_intro` fails with message: invalid 'simp', proposition expected Nat -/ simp_intro .. -- or `simp_intro hr y` example (r : Nat → Prop) : (∀ x, x > 0 → r x) → ∀ y z, y = 0 → z > y → r z := by -- unsolved simp_intro hr example (r : Nat → Prop) : (∀ x, x > 0 → r x) → ∀ y z, y = 0 → z > y → r z := by -- successfully solve the goal with the `simp_intro` in thie commit simp_intro .. -- or `simp_intro hr y z hy hz` ``` This commit makes it be able to introduce these kinds of hypotheses. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta	13/2	Mathlib/Tactic/SimpIntro.lean,MathlibTest/simp_intro.lean	2	1	['github-actions']	kmill assignee:kmill	27-81860 27 days ago	45-5392 1 month ago	45-5443 45 days
24395	rudynicolop author:rudynicolop	feat(Data/List): list splitting definitions and lemmas	Adds definitions and lemmas for obtaining all prefixes and suffixes of lists. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	143/2	Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/List/TakeDrop.lean	2	1	['github-actions']	ericrbg assignee:ericrbg	27-81842 27 days ago	44-2869 1 month ago	44-2931 44 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	7	['Louddy', 'Ruben-VandeVelde', 'alreadydone', 'github-actions', 'grunweg']	kbuzzard assignee:kbuzzard	26-44624 26 days ago	26-44624 26 days ago	53-45384 53 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	34/0	Mathlib/Data/Set/Lattice.lean,Mathlib/Data/Set/Pairwise/Lattice.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean	3	12	['github-actions', 'grunweg', 'j-loreaux', 'oeb25']	nobody	25-33393 25 days ago	25-34406 25 days ago	127-82912 127 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$	453/45	Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean	1	57	['AntoineChambert-Loir', 'Louddy', 'github-actions', 'kbuzzard']	nobody	24-42459 24 days ago	26-39366 26 days ago	98-59896 98 days
5919	MithicSpirit author:MithicSpirit	feat: implement orthogonality for AffineSubspace	Define `AffineSubspace.orthogonal` and `AffineSubspace.IsOrtho`, as well as develop an API emulating that of `Submodule.orthogonal` and `Submodule.IsOrtho`, respectively. Additionally, provide some relevant lemmas exclusive to affine subspaces, which are mostly to do with the relationship between orthogonality and `AffineSubspace.Parallel`. Closes #5539 --- Still WIP as I need to add more docstrings as well as notations for the new definitions. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis WIP help-wanted	287/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/AffineSubspace.lean	2	6	['MithicSpirit', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	MithicSpirit assignee:MithicSpirit	23-7190 23 days ago	23-7208 23 days ago	0-0 0 seconds
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`. --- - [x] depends on: #24576 - [ ] depends on: #25002 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data new-contributor blocked-by-other-PR	327/101	Mathlib.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/LCM.lean,Mathlib/Data/Nat/Factorization/Multiplicity.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/GroupTheory/Exponent.lean,Mathlib/NumberTheory/Cyclotomic/PrimitiveRoots.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean	8	40	['Kevew', 'Paul-Lez', 'YaelDillies', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	Kevew assignee:Kevew	22-2003 22 days ago	25-44365 25 days ago	85-42249 85 days
24932	jkanschik author:jkanschik	feat(Analysis/Calculus/VectorField): Implement product rule for liebrackets	This adds lemmas for the product rule (or Leibniz rule) for Lie brackets on vector fields. These new lemmas are called `lieBracket_smul_left` and similar. To accomodate this, rename the existing lemmas `{m}lieBracket{Within}_smul_{left,right}` to `{m}lieBracket{Within}_const_smul_{left,right}`. An additional PR for the same functionality on manifolds is in preparation and would depend on this PR. This will become useful when introducing Lie derivatives or covariant derivatives in differential geometry.	new-contributor t-differential-geometry awaiting-author	78/28	Mathlib/Analysis/Calculus/VectorField.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/Geometry/Manifold/VectorField/LieBracket.lean	3	30	['github-actions', 'grunweg', 'jkanschik', 'sgouezel']	nobody	22-715 22 days ago	23-30023 23 days ago	1-1522 1 day
24966	michaellee94 author:michaellee94	feat(Manifold/PartitionOfUnity): Existence of global C^n smooth section for nontrivial bundles	Add existence of global C^n smooth section for nontrivial bundles --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-differential-geometry	154/13	Mathlib/Geometry/Manifold/PartitionOfUnity.lean	1	3	['github-actions', 'grunweg', 'michaellee94']	nobody	21-79963 21 days ago	23-17943 23 days ago	23-45496 23 days
19796	peakpoint author:peakpoint	feat: L'Hopital's rule from within a convex set	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	190/19	Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Convex/Topology.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Order/Interval/Set/Basic.lean	5	14	['RemyDegenne', 'github-actions', 'leanprover-community-bot-assistant', 'peakpoint', 'sgouezel']	sgouezel assignee:sgouezel	21-79134 21 days ago	21-79134 21 days ago	55-29418 55 days
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$	442/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-35139 20 days ago	20-35158 20 days 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$	552/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-35082 20 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$	656/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	Blackfeather007 assignee:Blackfeather007	20-34999 20 days ago	unknown	unknown
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$	378/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-34810 20 days ago	20-34831 20 days ago	0-1204 20 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$	812/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-34730 20 days ago	unknown	unknown
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$	534/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-34552 20 days ago	20-34573 20 days ago	0-464 7 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 - [x] 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$	729/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-34488 20 days ago	unknown	unknown
24206	LessnessRandomness author:LessnessRandomness	feat(Geometry/Euclidean/Angle/Unoriented): triangle inequality for angles	Replace `proof_wanted` with proof. ---	new-contributor t-euclidean-geometry awaiting-author	221/11	Mathlib.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/TriangleInequality.lean	4	16	['LessnessRandomness', 'Timeroot', 'github-actions', 'jsm28', 'urkud']	jsm28 assignee:jsm28	19-77809 19 days ago	30-84002 30 days ago	20-6326 20 days
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 for `card α ≤ card β` on the vertex type `V` have at most `(card β-1)^(1/(card α))(card V)^(2-1/(card α))/2 + (card V)(card α-1)/2` edges. --- - [x] depends on: #19865 - [x] depends on: #20738 I'd like to make `aux` not private in the `KovariSosTuran` namespace to enable reuse of the double-counting here, but I don't know what to call it. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	289/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/KovariSosTuran.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot']	awainverse assignee:awainverse	19-29414 19 days ago	41-69299 1 month ago	41-69833 41 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']	mariainesdff assignee:mariainesdff	19-29279 19 days ago	64-12686 2 months ago	110-85911 110 days
24333	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): cycle graph implementation for generic vertex types	The existing `cycleGraph` implementation under Combinatorics/SimpleGraph/Circulant.lean only operates over `Fin n`. This PR implements a cycle graph implementation over any generic vertex type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	187/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Cycle.lean	2	29	['IvanRenison', 'github-actions']	kmill assignee:kmill	18-68272 18 days ago	46-65829 1 month ago	46-65883 46 days
24139	yuanyi-350 author:yuanyi-350	feat: add `Fin.cycleIcc` which rotates `range(i, j)`	In this file, I define permutation `cycleIcc i j hij`, which is the cycle `(i i+1 .... j)` leaving `(0 ... i-1)` and `(j+1 ... n-1)` unchanged. In other words, it rotates elements in `[i, j]` one step to the right. Also I prove some properties of `cycleIcc i j hij` such as it is a cycle and its cycleType is `j - i` This definition is used to prove the following result: ``` theorem succAbove_comp_cycleIcc [NeZero n] (x : Fin (n + 1) → L) (i j : Fin (n + 1)) (eq : x i = x j) (lt : i < j) x ∘ i.succAbove = x ∘ j.succAbove ∘ (cycleIcc hij) ``` More clearly, `x ∘ i.succAbove` and `x ∘ j.succAbove` are `Fin n → L` types. For example, when `n = 6, i = 2, j = 5` and `x i = x j` ``` x ∘ i.succAbove = (x 0, x 1, x 3, x 4, x 5, x 6) x ∘ j.succAbove = (x 0, x 1, x 2, x 3, x 4, x 6) ``` We have ``` (x 0, x 1, x 3, x 4, x 5, x 6) --(cycleIcc)--->(x 0, x 1, x 5, x 3, x 4, x 6) = (x 0, x 1, x 2, x 3, x 4, x 6) ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	132/1	Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Nat/SuccPred.lean,Mathlib/GroupTheory/Perm/Fin.lean	4	27	['acmepjz', 'faenuccio', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mbkybky', 'yuanyi-350']	faenuccio assignee:faenuccio	18-23587 18 days ago	38-69996 1 month ago	52-84299 52 days
24651	Hagb author:Hagb	feat(RingTheory/Finiteness/Defs): span of a set is finitely generated iff generated by a finite subset	--- - [ ] depends on: #24648 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	14/0	Mathlib/RingTheory/Finiteness/Defs.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	17-38635 17 days ago	17-38654 17 days ago	17-43206 17 days
24816	ciskiko author:ciskiko	feat(GroupTheory): add Regular Wreath Product	feat: add regular wreath product and some results; add iterated wreath product; add the isomorphism of iterated wreath product of Z_p to sylow p subgroup of S_{p^n}. Needs some work simplifying final result. --- [![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$	285/1	Mathlib.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/GroupTheory/RegularWreathProduct.lean,Mathlib/Logic/Equiv/Fin/Basic.lean,Mathlib/SetTheory/Cardinal/Finite.lean	7	102	['ciskiko', 'github-actions', 'tb65536']	tb65536 assignee:tb65536	15-33430 15 days ago	15-33431 15 days ago	24-38027 24 days
8102	miguelmarco author:miguelmarco	feat(Tactic): add `unify_denoms` and `collect_signs` tactics	This PR adds four new tactics: - `unify_denoms` tries to put expressions with several divisions in a form with only one division. In the case of fields, it works similarly to `field_simp`, but if the hypothesis about denominators being nonzero are not present, it assumes them, and leaves them as new goals to prove. In that sense, it is an "unsafe" tactic (but can be useful nevertheless, for example when you can't find which exact hypothesis is missing). It also works with expressions of naturals and Euclidean domains, assuming the corresponding hypothesis about the denominators dividing the numerators. - `unify_denoms!` extends `unify_denoms` to work with (in)equalities, assuming also that the denominators, once in normal form, are positive. - `collect_signs` works similarly with expressions using sums and substractions: it tries to put them in a form of one sum minus other sum. In the case of working with naturals, it assumes that we never substract a bigger number from a smaller one. Both are implemented essentially as a macro that combines several rewriting rules. Some new lemmas with the corresponding rules are added. ---	new-contributor t-meta please-adopt modifies-tactic-syntax good first issue	407/0	Mathlib.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CollectSigns.lean,Mathlib/Tactic/UnifyDenoms.lean,MathlibTest/unify_denoms.lean,scripts/noshake.json	7	54	['Paul-Lez', 'YaelDillies', 'github-actions', 'joneugster', 'kbuzzard', 'miguelmarco']	Paul-Lez assignee:Paul-Lez	14-24186 14 days ago	26-4939 26 days ago	22-16933 22 days
25224	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): edgeSet of Eulerian walk equal to edgeSet of graph	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics easy	6/0	Mathlib/Combinatorics/SimpleGraph/Trails.lean	1	2	['IvanRenison', 'github-actions']	nobody	12-83709 12 days ago	13-74712 13 days ago	13-75614 13 days
25225	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): Eulerian walk in connected graph contains all vertices	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	16/0	Mathlib/Combinatorics/SimpleGraph/Trails.lean	1	3	['IvanRenison', 'github-actions']	nobody	12-83102 12 days ago	13-74514 13 days ago	13-74571 13 days
25248	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): Add Subgraph.inclusion_edge_apply_coe and inclusion_edgeSet_apply_coe	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	12/0	Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	1	1	['github-actions']	nobody	12-76744 12 days ago	12-76745 12 days ago	12-76800 12 days
25238	Hagb author:Hagb	feat(Tactic/ComputeDegree): add support for scalar multiplication with different types	It would be able to deal with `a • (X : R[X])` where `a : S` is in a different type `S` with `[SMulZeroClass S R]`. --- - [x] depends on: #25237 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	17/5	Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	12-56734 12 days ago	12-81177 12 days ago	12-83080 12 days
24804	Moises-Herradon-Cueto author:Moises-Herradon-Cueto	feat(CategoryTheory/Limits/Preserves/Shapes): show that if a functor preserves limits, so does `Over.post`	If a functor `F` preserves limits (of a certain shape, finite, or of a certain size), then so does the induced functor on `Over` categories. From Toric Co-authored-by: Yaël Dillies --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric new-contributor t-category-theory	125/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Over.lean,Mathlib/CategoryTheory/WithTerminal/Basic.lean	3	17	['Moises-Herradon-Cueto', 'YaelDillies', 'erdOne', 'github-actions', 'joelriou']	nobody	12-42970 12 days ago	13-18912 13 days ago	19-23308 19 days
25257	Hagb author:Hagb	feat(Mathlib/Algebra/Polynomial/Degree/Domain.lean): generalize `natDegree_smul` from `SMulWithZero` to `SMulZeroClass`	as suggested by @eric-wieser in https://github.com/leanprover-community/mathlib4/pull/25237#discussion_r2111599865 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	4/3	Mathlib/Algebra/Polynomial/Degree/Domain.lean	1	1	['github-actions']	nobody	12-26109 12 days ago	12-26109 12 days ago	12-26171 12 days
25283	Brian-Nugent author:Brian-Nugent	feat: regular local rings	Adds regular local rings and proves they are integral domains. --- - [ ] depends on: #25280 - [ ] depends on: #25282 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra blocked-by-other-PR label:t-algebra$	871/0	.vscode/settings.json,Mathlib.lean,Mathlib/RingTheory/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRingDimension.lean,Mathlib/RingTheory/RegularLocalRing.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	11-84684 11 days ago	11-84686 11 days ago	0-882 14 minutes
25282	Brian-Nugent author:Brian-Nugent	feat: krull dimension facts for Noetherian local rings	Proves that when modding out by a non-unit, the Krull dimension of a noetherian local ring drops by at most one. Also proves that the embedding dimension is an upper bound on the Krull dimension. --- - [ ] depends on: #25280 [![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$	626/0	.vscode/settings.json,Mathlib.lean,Mathlib/RingTheory/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRingDimension.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	11-84683 11 days ago	11-84685 11 days ago	0-1566 26 minutes
24543	pfaffelh author:pfaffelh	feat (Topology/Compactness/CompactSystem): Set system of finite unions of sets in a compact system is again a compact system	feat (Topology/Compactness/CompactSystem): The set system of finite unions of sets in a compact system is a compact system A compact system is a set system with the following property: If all finite intersections of a sequence in the set system is non-empty, the countable intersection is not empty. Starting with a compact system, consider the finite unions of sets in the copact system. Such sets again form a compact system (`IsCompactSystem.union.isCompactSystem`). --- - [x] depends on: #24541 - [x] depends on: #24542 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology blocked-by-other-PR	431/2	Mathlib/Topology/Compactness/CompactSystem.lean	1	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	7-82487 7 days ago	7-82487 7 days ago	0-1830 30 minutes
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	209/2	Mathlib.lean,Mathlib/MeasureTheory/Measure/Decomposition/Hahn.lean,Mathlib/MeasureTheory/Measure/Sub.lean,Mathlib/MeasureTheory/VectorMeasure/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Decomposition/JordanSub.lean	5	132	['DavidLedvinka', 'DrLSimon', 'EtienneC30', 'github-actions', 'grunweg', 'urkud']	EtienneC30 assignee:EtienneC30	7-44161 7 days ago	7-44161 7 days ago	29-62586 29 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$	30/0	Mathlib/LinearAlgebra/Span/Basic.lean	1	21	['Paul-Lez', 'Raph-DG', 'github-actions', 'j-loreaux', 'mattrobball']	mattrobball assignee:mattrobball	7-31078 7 days ago	7-31078 7 days ago	109-70769 109 days
11021	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology) : add join of augmented SSets	This pull-request adds the definition of the join of augmented SSets defined as contravariant functors from `WithInitial SimplexCategory` to `Type u`. In addition it shows that the join of two standard augmented SSets is again an augmented SSets. From this the definition of the join of simplicial sets should follow easily. To aid the above theory, an api for `WithInitial SimplexCategory` has been created, with the notion of the `join` and `split` (forming a sort of inverse to join) of objects in this category are defined. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	313-42768 10 months ago	369-37814 1 year 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	294-20067 9 months ago	299-36309 9 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	294-19901 9 months ago	325-21226 10 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	258-45486 8 months ago	258-45486 8 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	258-5961 8 months ago	258-5961 8 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	250-1939 8 months ago	250-1939 8 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	250-1939 8 months ago	250-1940 8 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	250-1938 8 months ago	250-1938 8 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	243-12137 8 months ago	243-12137 8 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	232-24596 7 months ago	232-24596 7 months ago	6-8380 6 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	221-82306 7 months ago	248-51097 8 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	215-52872 7 months ago	215-52872 7 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	213-8993 7 months ago	213-8993 7 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	208-47825 6 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	207-9419 6 months ago	208-78227 6 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	196-38467 6 months ago	196-38467 6 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	196-30997 6 months ago	196-30997 6 months ago	20-16585 20 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	190-32330 6 months ago	190-32330 6 months ago	0-16072 4 hours
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	178-70242 5 months ago	185-19265 6 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	161-22673 5 months ago	206-38301 6 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	145-5854 4 months ago	145-5854 4 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	144-24940 4 months ago	144-24940 4 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	144-24940 4 months ago	144-24940 4 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	143-77259 4 months ago	143-77259 4 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	139-12518 4 months ago	139-12519 4 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	132-29866 4 months ago	132-29866 4 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	131-4299 4 months ago	131-4299 4 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	129-83870 4 months ago	129-83870 4 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	119-73576 3 months ago	119-73576 3 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	115-38253 3 months ago	115-38253 3 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	115-21275 3 months ago	115-21275 3 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	110-24901 3 months ago	110-24902 3 months 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	104-73947 3 months ago	104-73947 3 months 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	103-83762 3 months ago	103-85035 3 months 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	101-29873 3 months ago	101-29873 3 months ago	125-12755 125 days
18626	hannahfechtner author:hannahfechtner	feat : define Artin braid groups	Define the Artin braid group on infinitely many strands. Includes a toGroup function which defines a function out of the braid group to any other group (given a function which satisfies the braid relations) (more to come in this file; next up: Artin braid groups on finitely many strands) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict awaiting-author label:t-algebra$	91/0	Mathlib.lean,Mathlib/GroupTheory/SpecificGroups/BraidGroup/Basic.lean	2	22	['github-actions', 'hannahfechtner', 'jcommelin', 'joelriou']	nobody	100-14184 3 months ago	100-14184 3 months 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	97-58697 3 months ago	97-58697 3 months 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	96-15887 3 months ago	96-15887 3 months ago	16-76141 16 days
15578	znssong author:znssong	feat(Function): Fixed points of function `f` with `f(x) >= x`	We added some lemmas of fixed points of function `f` with `f(x) >= x`, where `f : α → α` is a function on a finite type `α`. This will be needed in proof of Bondy-Chvátal theorem. --- See also branch `meow-sister/BondyChvatal`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict awaiting-author	82/0	Mathlib.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Increasing.lean	3	32	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'urkud', 'vihdzp', 'znssong']	nobody	88-11713 2 months ago	88-11713 2 months ago	29-48368 29 days
21018	markimunro author:markimunro	feat(Data/Matrix): add file with key definitions and theorems about elementary row operations	Prove that each elementary row operation is equivalent to a multiplication by an elementary matrix, has another row operation which inverts it, and that each elementary matrix has a left inverse. This is a very large PR and I understand it will take time. This is my first one and will likely have issues but I will be ready to answer questions/fix them as soon as possible. Co-authored-by: Christopher Lynch --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict awaiting-author enhancement	1230/0	Mathlib.lean,Mathlib/Data/Matrix/ElementaryRowOperations.lean,Mathlib/Data/Matrix/GaussianElimination.lean,Mathlib/Data/Matrix/GaussianEliminationOld,Mathlib/Data/Matrix/oldnames,et --hard 18533caba32,lean-toolchain	7	n/a	['chrisflav', 'eric-wieser', 'github-actions', 'j-loreaux', 'markimunro']	nobody	69-47112 2 months 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	68-28146 2 months ago	unknown	unknown
15212	victorliu5296 author:victorliu5296	feat: Add fundamental theorem of calculus-2 for Banach spaces	add the Mean Value Theorem for Banach spaces to the library and include reference for the theorem statement This theorem states that if `f : X → Y` is differentiable along the line segment from `a` to `b`, then the change in `f` equals the integral of its derivative along this path. This extends the mean value theorem to Banach spaces. This can be used for the eventual proof of the Newton-Kantorovich theorem with 1 constant contained inside the added reference. Here is the discussion on Zulipchat: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Contributing.20FTC-2.20for.20Banach.20spaces	new-contributor t-measure-probability t-analysis merge-conflict awaiting-author	60/1	Mathlib/MeasureTheory/Integral/FundThmCalculus.lean	1	3	['github-actions', 'hrmacbeth', 'victorliu5296']	nobody	64-42101 2 months ago	64-42101 2 months ago	51-85104 51 days
22701	ctchou author:ctchou	feat(Combinatorics): the Katona circle method	This file formalizes the Katona circle method. From PlainCombi (LeanCamCombi): https://github.com/YaelDillies/LeanCamCombi/blob/master/LeanCamCombi/PlainCombi/KatonaCircle.lean Co-authored-by: Yaël Dillies	new-contributor t-combinatorics merge-conflict	121/0	Mathlib.lean,Mathlib/Combinatorics/KatonaCircle.lean	2	1	['github-actions']	nobody	63-78056 2 months ago	63-78056 2 months ago	30-8337 30 days
21488	imbrem author:imbrem	feat(CategoryTheory/Monoidal): premonoidal categories	Add support for premonoidal categories --- Still want to add support for: - Premonoidal braided/symmetric categories - The monoidal coherence theorem, which I've already ported in my `discretion` library - The `coherence` tactic, which should work fine for premonoidal categories too but wanted to get this in front of reviewers ASAP to make sure my general approach was alright [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory merge-conflict	900/361	Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/CoherenceLemmas.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,MathlibTest/StringDiagram.lean	21	9	['YaelDillies', 'github-actions', 'grunweg', 'imbrem', 'kim-em', 'leanprover-community-bot-assistant']	nobody	61-24289 2 months ago	61-24290 2 months ago	58-20339 58 days
20873	vbeffara author:vbeffara	feat(Topology/Covering): path lifting and homotopy lifting	This proves the existence and uniqueness of path and homotopy lifts through covering maps. --- I tried to separate as much of the proof as possible into separate PRs (which are already in Mathlib now), but the proof here relies on a monolithic construction of an explicit lift along a well-chosen subdivision, in `partial_lift`, with associated definitions. Only one standalone lean file added. An older WIP PR #10084 by Junyan Xu @alreadydone proves similar results using a very similar construction for path lifting, with a different argument to obtain continuity for homotopy lifting. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology merge-conflict awaiting-author	281/1	Mathlib.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Lift.lean	3	9	['alreadydone', 'github-actions', 'grunweg', 'vbeffara']	nobody	60-27017 1 month ago	60-27017 1 month ago	55-53553 55 days
20313	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Data/Complex/Exponential): prove some useful results about the complex exponential.	This PR proves two basic results about the complex exponential: * `abs_exp_mul_I (x : ℂ) : abs (Complex.exp (I * x)) = Real.exp (-x.im)` * `one_sub_rexp_re_le_abs_one_sub_cexp (x : ℂ) : 1 - Real.exp x.re ≤ Complex.abs (1 - Complex.exp x)` Both results were proved as part of the sphere packing project. There's a chance they're too specific for mathlib, but I thought they were worth PRing anyway. Would it also be a good idea to tag `abs_exp_mul_I` with `simp`? Feedback/suggestions welcome. Note: `one_sub_rexp_re_le_abs_one_sub_cexp` was proved by Bhavik Mehta @b-mehta --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict	167/141	Mathlib.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/ERealExp.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev.lean,Mathlib/Data/Complex/Exponential/Defs.lean,Mathlib/Data/Complex/Exponential/Lemmas.lean,Mathlib/Data/Complex/ExponentialBounds.lean,Mathlib/Tactic/FunProp.lean,MathlibTest/Recall.lean,MathlibTest/positivity.lean	10	12	['b-mehta', 'github-actions', 'kim-em', 'thefundamentaltheor3m', 'trivial1711']	nobody	52-84615 1 month ago	52-84615 1 month ago	25-60481 25 days
20730	kuotsanhsu author:kuotsanhsu	feat(LinearAlgebra/Matrix/SchurTriangulation): prove Schur decomposition/triangulation	`Matrix.schur_triangulation` shows that a matrix over an algebraically closed field is unitarily similar to an upper triangular matrix --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict awaiting-author label:t-algebra$	317/2	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/LinearAlgebra/Matrix/SchurTriangulation.lean,Mathlib/Logic/Equiv/Basic.lean	4	14	['eric-wieser', 'github-actions', 'kim-em', 'kuotsanhsu']	nobody	52-80747 1 month ago	52-80747 1 month ago	13-60072 13 days
15654	TpmKranz author:TpmKranz	feat(Computability): language-preserving maps between NFA and RE	Map REs to NFAs via Thompson's construction and NFAs to REs using GNFAs Last chunk of #12648 --- - [ ] depends on: #15651 - [ ] depends on: #15649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict blocked-by-other-PR	985/2	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Data/FinEnum/Option.lean,docs/references.bib	7	3	['github-actions', 'leanprover-community-mathlib4-bot', 'meithecatte']	nobody	34-77865 1 month ago	34-77870 1 month ago	0-179 2 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 merge-conflict	186/0	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Restricted.lean	2	18	['Paul-Lez', 'WilliamCoram', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	26-33783 26 days ago	26-33785 26 days ago	48-76736 48 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 merge-conflict awaiting-author	244/0	Mathlib.lean,Mathlib/Combinatorics/Flow/Basic.lean,docs/references.bib	3	57	['Shreyas4991', 'YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak', 'niklasmohrin']	nobody	25-70063 25 days ago	25-70065 25 days ago	86-21072 86 days
21603	imbrem author:imbrem	feat(CategoryTheory/ChosenFiniteProducts): add 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 merge-conflict awaiting-author	261/2	Mathlib/CategoryTheory/ChosenFiniteProducts.lean	1	17	['TwoFX', 'YaelDillies', 'github-actions', 'grunweg', 'imbrem', 'joelriou', 'leanprover-community-bot-assistant']	TwoFX and joelriou assignee:TwoFX assignee:joelriou	25-2480 25 days ago	25-2662 25 days ago	89-21170 89 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 merge-conflict 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	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	24-45371 24 days ago	24-45374 24 days ago	20-75471 20 days
15651	TpmKranz author:TpmKranz	feat(Computability/NFA): operations for Thompson's construction	Lays the groundwork for a proof of equivalence of RE and NFA, w.r.t. described language. Actual connection to REs comes later, after the groundwork for the opposite direction has been laid. Third chunk of #12648 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	307/5	Mathlib/Computability/NFA.lean	1	15	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte']	nobody	21-14071 21 days ago	21-14072 21 days ago	45-84611 45 days
22361	rudynicolop author:rudynicolop	feat(Computability/NFA): nfa closure properties	Add the closure properties union, intersection and reversal for NFA. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	218/2	Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean	2	90	['EtienneC30', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	EtienneC30 assignee:EtienneC30	21-13145 21 days ago	21-13147 21 days ago	39-67601 39 days
23349	BGuillemet author:BGuillemet	feat: add LocallyLipschitzOn.lipschitzOnWith_of_isCompact and two small lemmas about Lipschitz functions	Main feat (in Mathlib/Topology/EMetricSpace/Basic.lean): if a function `f` from an extended pseudometric space to a pseudometric space is locally Lipschitz on a compact subset `s`, then `f` is Lipschitz on `s`. The theorem is true only when the codomain of `f` is a pseudometric space, so it needs imports from Mathlib/Topology/MetricSpace. Other small feat (in Mathlib/Analysis/Calculus/ContDiff/RCLike.lean): a function that is continuously differentiable on an open subset is locally Lipschitz on this subset. --- - [ ] depends on: #22890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-topology merge-conflict	59/4	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	PatrickMassot assignee:PatrickMassot	13-9385 13 days ago	13-9387 13 days ago	35-30364 35 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	214-78489 7 months ago	215-3668 7 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	214-62502 7 months ago	221-74724 7 months ago	0-8515 2 hours
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	59-998 1 month ago	214-63136 7 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	59-996 1 month ago	216-54247 7 months ago	0-627 10 minutes
24543	pfaffelh author:pfaffelh	feat (Topology/Compactness/CompactSystem): Set system of finite unions of sets in a compact system is again a compact system	feat (Topology/Compactness/CompactSystem): The set system of finite unions of sets in a compact system is a compact system A compact system is a set system with the following property: If all finite intersections of a sequence in the set system is non-empty, the countable intersection is not empty. Starting with a compact system, consider the finite unions of sets in the copact system. Such sets again form a compact system (`IsCompactSystem.union.isCompactSystem`). --- - [x] depends on: #24541 - [x] depends on: #24542 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology blocked-by-other-PR	431/2	Mathlib/Topology/Compactness/CompactSystem.lean	1	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	7-82487 7 days ago	7-82487 7 days ago	0-1830 30 minutes
24542	pfaffelh author:pfaffelh	feat (Topology/Compactness/CompactSystem): Closed and compact square cylinders form a compact system.	feat (Topology/Compactness/CompactSystem): Closed and compact square cylinders form a compact system. A square cylinder is a set of the form `s.pi t` in a product space. A closed compact square cylinder has `IsClosed (t i)` and `IsCompact (t i)` for all `i ∈ s`. This set system is a compact system (as introduced in PR #24541). Streamline the definition of square cylinders in MeasureTheory/Constructions/Cylinders on the way. Co-authors: Rémy Degenne remy.degenne@inria.fr --- - [x] depends on: #24541 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology blocked-by-other-PR	264/66	Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/Constructions/Cylinders.lean,Mathlib/MeasureTheory/Constructions/ProjectiveFamilyContent.lean,Mathlib/Topology/Compactness/CompactSystem.lean	4	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-80012 22 hours ago	0-84878 23 hours ago	0-192 3 minutes
13158	erdOne author:erdOne	refactor(RingTheory/OreLocalization/Module): remove `LocalizedModule.mk`.	--- - [x] depends on: #13151 - [ ] depends on: #13156 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	335-23447 11 months ago	335-23470 11 months ago	0-0 0 seconds
11156	smorel394 author:smorel394	feat(LinearAlgebra/{TensorProductBasis,Dual}): basis and dual of `PiTensorProduct`	Construct a basis of a `PiTensorProduct` of modules given bases of the modules, and relationship between the dual of a `PiTensorProduct` and the `PiTensorProduct` of the duals. Main results: * `Basis.piTensorProduct` (in `LinearAlgebra/TensorProductBasis.lean`): Let `ι` be a `Fintype` and `M` be a family of modules indexed by `ι`. If `b i : κ i → M i` is a basis for every `i` in `ι`, then `fun (p : Π i, κ i) ↦ ⨂ₜ[R] i, b i (p i)` is a basis of `⨂[R] i, M i`. * `PiTensorProduct.dualDistrib` (in `LinearAlgebra/Dual.lean`): The canonical linear map from `⨂[R] i, Dual R (M i)` to `Dual R (⨂[R] i, M i)`, sending `⨂ₜ[R] i, f i` to the composition of `PiTensorProduct.map f` with the linear equivalence `⨂[R] i, R →ₗ R` given by multiplication. * `PiTensorProduct.dualDistribEquiv` (also in `LinearAlgebra/Dual.lean`): A linear equivalence between `⨂[R] i, Dual R (M i)` and `Dual R (⨂[R] i, M i)` when all `M i` are finite free modules. If `f : (i : ι) → Dual R (M i)`, then this equivalence sends `⨂ₜ[R] i, f i` to the composition of `PiTensorProduct.map f` with the natural isomorphism `⨂[R] i, R ≃ R` given by multiplication. - [ ] depends on: #11155 (currently used as the base branch; do not merge without switching it back to `master`!) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra merge-conflict please-adopt blocked-by-other-PR label:t-algebra$	166/2	Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/LinearAlgebra/TensorProduct/Basis.lean	3	4	['eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	161-22673 5 months ago	206-38301 6 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	4-29888 4 days ago	66-75572 2 months ago	0-2933 48 minutes
24808	JovanGerb author:JovanGerb	lean pr testing 8294	Testing a cache optimization in `isDefEq`, to avoid exponential blowup during unification. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	243/98	Mathlib.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Preimage.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/NeZero.lean,Mathlib/Algebra/Homology/DifferentialObject.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/Analysis/Complex/ValueDistribution/CharacteristicFunction.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/LConvolution.lean,Mathlib/Analysis/NormedSpace/Alternating/Curry.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Int/Init.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Vector/MapLemmas.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/MeasureTheory/Group/Convolution.lean,Mathlib/MeasureTheory/Group/IntegralConvolution.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean,Shake/Main.lean,lake-manifest.json,lakefile.lean,lean-toolchain	35	21	['JovanGerb', 'adomani', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	2-686 2 days ago	2-686 2 days ago	0-11360 3 hours

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	63-21594 2 months ago	63-21594 2 months ago	0-0 0 seconds
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	52-80776 1 month ago	52-80776 1 month ago	0-0 0 seconds
25516	kim-em author:kim-em	chore: test PR from fork	This PR tests making a PR from a fork.		1/0	Mathlib/Computability/AkraBazzi/AkraBazzi.lean	1	1	['bryangingechen']	nobody	3-22035 3 days ago	3-58538 3 days ago	0-0 0 seconds
25537	literandltx author:literandltx	feat(number_theory/legendre_symbol): Add sqrt‐of‐residue theorems for p=4k+3 and p=8k+5	Add a new file `QuadraticResidueRoots.lean` under `Mathlib/NumberTheory/LegendreSymbol/` that proves two explicit “square-root of quadratic residue” theorems for primes of the specific form. - `exists_sqrt_of_residue_mod4_eq3` for primes `p = 4k + 3` - `exists_sqrt_of_residue_mod8_eq5`* for primes `p = 8*k + 5` It also introduces the helper lemmas `euler_criterion_traditional` and `legendreSym.at_two_mod8_eq_5`. Import lines in `Mathlib.lean` and `Mathlib/NumberTheory/LegendreSymbol/Basic.lean` have been updated accordingly.	new-contributor	217/0	Mathlib.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticReciprocity.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticResidueRoots.lean	4	0	[]	nobody	3-19735 3 days ago	3-19735 3 days ago	0-0 0 seconds
25599	adomani author:adomani	test: autolabel from forks	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	test-ci awaiting-author WIP	1/1	Mathlib/Tactic/Eval.lean,newFileOnMaster.md	2	3	['adomani', 'bryangingechen', 'github-actions']	nobody	0-33809 9 hours ago	1-9271 1 day ago	0-0 0 seconds
25623	mattrobball author:mattrobball	feat: decidable equality for `Quiver.Path`	Given a quiver with decidable equality on its vertices and arrows, we construct an instance of decidable equality for `Quiver.Path`. We proceed through a recursion on the length of the path utilizing an intermediate subtype of uniformly bounded paths `Quiver.Path.BoundedPath`. This was motivated by doing computations on small quivers with Lean. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		69/0	Mathlib/Combinatorics/Quiver/Path.lean	1	1	['github-actions']	nobody	0-22514 6 hours ago	0-22603 6 hours 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	155-56406 5 months ago	155-56406 5 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	313-42767 10 months ago	475-23932 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	294-43251 9 months ago	294-43253 9 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	203-16688 6 months ago	258-18608 8 months ago	41-7533 41 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	140-38439 4 months ago	140-38439 4 months ago	69-35596 69 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	97-25322 3 months ago	97-25322 3 months ago	6-3646 6 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	84-38789 2 months ago	84-38789 2 months ago	20-81771 20 days
24218	alreadydone author:alreadydone	chore(Algebra): remove `mid_assoc` from `IsMulCentral`	as it is a consequence of left and right associativity in the presence of commutativity. Also change the commutativity condition to use `Commute`. --- Even without commutativity, left and right associativity of an element `e` in a magma is sufficient to prove that elements of the form `e * x * e` (the "corner" of `e`) form a submagma. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	31/69	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Group/Center.lean,Mathlib/Algebra/GroupWithZero/Center.lean,Mathlib/Algebra/Ring/Center.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Algebra/Star/Center.lean,Mathlib/Algebra/Star/CentroidHom.lean,Mathlib/GroupTheory/Submonoid/Center.lean,Mathlib/LinearAlgebra/Basis/Submodule.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/RingTheory/Idempotents.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean	12	8	['alreadydone', 'github-actions', 'mans0954']	nobody	1	50-12169 1 month ago	50-27229 1 month ago	50-27219 50 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	8	['Command-Master', 'Ruben-VandeVelde', 'github-actions', 'urkud', 'vihdzp']	nobody	2	45-69064 1 month ago	216-73142 7 months ago	10-77913 10 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']	Ruben-VandeVelde assignee:Ruben-VandeVelde	1	31-28220 1 month ago	56-29490 1 month ago	56-29544 56 days
21276	GabinKolly author:GabinKolly	feat(ModelTheory/Substructures): define equivalences between equal substructures	Define first-order equivalences between equal substructures, and prove related properties. --- This is some preparatory work for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic awaiting-author	62/0	Mathlib/ModelTheory/Substructures.lean	1	19	['GabinKolly', 'YaelDillies', 'fpvandoorn', 'github-actions', 'grunweg']	nobody	1	31-11500 1 month ago	31-11500 1 month ago	46-55730 46 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	7	['Louddy', 'Ruben-VandeVelde', 'alreadydone', 'github-actions', 'grunweg']	kbuzzard assignee:kbuzzard	1	26-44624 26 days ago	26-44624 26 days ago	53-45384 53 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/)	awaiting-author documentation	52/14	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	10	['ADedecker', 'BoltonBailey', 'eric-wieser', 'github-actions', 'jcommelin', 'mattrobball']	nobody	1	25-49669 25 days ago	25-49669 25 days ago	33-13460 33 days
10235	urkud author:urkud	feat: add `Decidable`, `Fintype`, `Encodable` linters	This PR ports the `decidableClassical`, `fintypeFinite` and `encodableCountable` linters from mathlib3: all three are environment linters which flag declarations that have a hypothesis `[Decidable p]` etc., but do not use the underlying assumption in this type. Restructuring the code can make the statement more general. The implementation is in fact quite general, and can easily adapt to include further types. PRs #17518 and #17519 are two examples of further such linters. --- Please don't fix the failures related to `HasFDerivWithinAt.pi`. Finiteness assumptions in these lemmas will be completely removed during porting to TVS. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench large-import t-linter t-meta awaiting-author	123/4	Mathlib.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/NumberTheory/JacobiSum/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Tactic.lean,Mathlib/Tactic/GeneralizeProofs.lean,Mathlib/Tactic/Linter/UnusedAssumptionInType.lean	11	n/a	['Command-Master', 'github-actions', 'grunweg', 'kmill', 'leanprover-bot', 'urkud']	nobody	1	23-5887 23 days ago	unknown	unknown
21624	sinhp author:sinhp	feat(CategoryTheory): The (closed) monoidal structure on the product category of families of (closed) monoidal categories	Given a family of closed monoidal categories, we show that the product of these categories is a closed monoidal category with the pointwise monoidal structure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	144/0	Mathlib.lean,Mathlib/CategoryTheory/Pi/Basic.lean,Mathlib/CategoryTheory/Pi/Monoidal.lean,Mathlib/CategoryTheory/Pi/MonoidalClosed.lean	4	19	['TwoFX', 'YaelDillies', 'b-mehta', 'github-actions', 'jcommelin', 'sinhp']	nobody	1	20-45417 20 days ago	20-45417 20 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']	mariainesdff assignee:mariainesdff	1	19-29279 19 days ago	64-12686 2 months ago	110-85911 110 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$	104/0	Mathlib.lean,Mathlib/GroupTheory/FreeGroup/ReducedWords.lean	2	37	['b-reinke', 'github-actions', 'tb65536', 'vlad902']	nobody	2	14-59970 14 days ago	74-25781 2 months ago	74-33611 74 days
25188	vlad902 author:vlad902	feat: add lemmas about `List.scanr`	I add basic lemmas to reason about `List.scanr`, and slightly clean-up the file and add some basic lemmas to keep the API unified with the one for `List.scanl`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	84/18	Mathlib/Data/List/Scan.lean	1	5	['b-mehta', 'github-actions', 'vlad902']	nobody	1	14-48841 14 days ago	14-49069 14 days ago	14-72569 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$	57/65	Mathlib/Algebra/Field/Equiv.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/GroupWithZero/Units/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	13	4	['alreadydone', 'github-actions', 'xroblot']	nobody	1	13-6805 13 days ago	65-72197 2 months ago	65-72217 65 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	65/0	Mathlib.lean,Mathlib/Geometry/Convex/Polytope.lean,Mathlib/Geometry/Convex/README.md	3	7	['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	1	12-45087 12 days ago	12-45105 12 days ago	59-44919 59 days
22919	plp127 author:plp127	feat(Data/Fintype/Pi): Make `Fintype` instance for `RelHom`s computable	Makes the `Fintype` instance for rel homs computable. See this [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Classical.20vs.20constructive.20logic.20in.20computation/near/496220816) message. --- - [x] depends on: #24748 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	178/44	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Data/Fintype/CardEmbedding.lean,Mathlib/Data/Fintype/Pi.lean	5	29	['IvanRenison', 'b-mehta', 'eric-wieser', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'plp127']	b-mehta assignee:b-mehta	1	11-58021 11 days ago	11-58021 11 days ago	73-73341 73 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	253/1	Mathlib.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroMulInt.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	7	22	['Ruben-VandeVelde', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky', 'smmercuri', 'xroblot']	nobody	1	9-68894 9 days ago	9-68894 9 days ago	51-21490 51 days
25315	ocfnash author:ocfnash	feat: add `simp` to lemma `Fin.coe_ofNat_eq_mod`	One consequence is that `simp` can now prove things like this: ```lean example : (3 : Fin 10).val = 3 := by simp example : (4 : Fin 10).val = 4 := by simp example : (5 : Fin 10).val = 5 := by simp ``` previously this only this only worked up to `(2 : Fin 10).val = 2` (via lemmas like `Fin.val_two`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	32/28	Archive/Imo/Imo2024Q5.lean,Mathlib/AlgebraicTopology/DoldKan/Faces.lean,Mathlib/Analysis/CStarAlgebra/SpecialFunctions/PosPart.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Parity.lean,Mathlib/Data/Fin/Rev.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/GroupTheory/Perm/Fin.lean,Mathlib/RingTheory/ChainOfDivisors.lean,MathlibTest/matrix.lean	10	25	['b-mehta', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mattrobball', 'ocfnash']	nobody	1	9-18565 9 days ago	10-11743 10 days ago	10-11733 10 days
24777	joelriou author:joelriou	feat(CategoryTheory): abstract argument for the stability under transfinite compositions	If a class of morphisms is multiplicative, respects isomorphisms and is stable under filtered colimits, then it is stable under transfinite compositions. (This simplifies the proof in the case of monomorphisms in Grothendieck abelian categories, for isomorphisms, and in #23282, we shall apply this to monomorphisms in `Type`.) --- - [x] depends on: #24773 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory	122/116	Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/Colim.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/EnoughInjectives.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/Monomorphisms.lean,Mathlib/CategoryTheory/MorphismProperty/Limits.lean,Mathlib/CategoryTheory/MorphismProperty/TransfiniteComposition.lean	5	12	['callesonne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	1	8-11882 8 days ago	9-4698 9 days ago	21-28102 21 days
24514	b-mehta author:b-mehta	chore(Int/GCD): use fuel in xgcd	Modify the definition of xgcd to use fuel recursion, to allow it to be reduced in the kernel. As a consequence, this means the evaluation of field operations in ZMod p become provable by `rfl` and `decide`. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/opaque.20recursion.20definitions.20break.20mergeSort.20decidability --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	44/22	Mathlib/Data/Int/GCD.lean	1	4	['b-mehta', 'eric-wieser', 'github-actions', 'nomeata', 'urkud']	nobody	1	7-84218 7 days ago	39-19437 1 month ago	39-19489 39 days
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. --- - [x] depends on: #23386 - [x] depends on: #23962 - [x] depends on: #24107 - [x] depends on: #24117 - [x] depends on: #24167 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	449/4	Mathlib.lean,Mathlib/Algebra/Group/End.lean,Mathlib/GroupTheory/GroupAction/FixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean	6	29	['github-actions', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	1	6-35345 6 days ago	6-35345 6 days ago	13-15466 13 days
24480	mariainesdff author:mariainesdff	feat(RingTheory/DividedPowers/SubPDIdeal): add SubDPIdeal	Let `A` be a commutative (semi)ring and let `I` be an ideal of `A` with a divided power structure `hI`. A subideal `J` of `I` is a sub-dp-ideal of `(I, hI)` if, for all `n ∈ ℕ > 0` and all `x ∈ J`, `hI.dpow n x ∈ J`. The "TODOs" listed on the file docstring have been formalized by the authors and will be added in subsequent PRs. Co-authored-by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory ready-to-merge delegated label:t-algebra$	373/0	Mathlib.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/RingTheory/Ideal/Span.lean	3	20	['AntoineChambert-Loir', 'github-actions', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	1	6-35277 6 days ago	6-36888 6 days ago	33-65896 33 days
25364	Paul-Lez author:Paul-Lez	feat(Analysis/SpecialFunction/NthRoot): definition and basic API of Real.nthRoot	Co-authored-by: Eric Wieser --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	256/0	Mathlib/Analysis/SpecialFunctions/NthRoot.lean,Mathlib/Data/Sign.lean	2	16	['eric-wieser', 'fpvandoorn', 'github-actions', 'j-loreaux', 'madvorak']	nobody	1	5-35397 5 days ago	7-23524 7 days ago	0-42 42 seconds
25139	kckennylau author:kckennylau	feat(RingTheory): basis for `Polynomial.degreeLT`	Linear algebra results about the module `R[x]_n` of polynomials with degree `< n`. Co-authored-by: Anne Baanen --- - [x] depends on: #25270 Used in a future resultant PR from branch [kckennylau/resultant](https://github.com/leanprover-community/mathlib4/tree/kckennylau/resultant). This file is split from that branch because there are already over 1000 lines of code. [![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$	195/2	Mathlib.lean,Mathlib/Algebra/Polynomial/Taylor.lean,Mathlib/RingTheory/Polynomial/DegreeLT.lean	3	108	['YaelDillies', 'erdOne', 'github-actions', 'kbuzzard', 'kckennylau', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	1	5-9619 5 days ago	5-43801 5 days ago	4-17234 4 days
25401	digama0 author:digama0	feat(Util): SuppressSorry option	See also leanprover/lean4#8611 and [#lean4 > Silent sorry @ 💬](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Silent.20sorry/near/503537964). This is a stop-gap solution while leanprover/lean4#8611 is underway, but it works about as well as any other built in option. Hooking declaration elaborators turns out to be a very powerful technique. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	342/0	Mathlib.lean,Mathlib/Util/CommandElabHook.lean,Mathlib/Util/SuppressSorry.lean,MathlibTest/suppressSorry.lean	4	13	['digama0', 'eric-wieser', 'github-actions']	nobody	1	4-68137 4 days ago	5-6071 5 days ago	6-16421 6 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/)	file-removed 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	79	['0art0', 'JovanGerb', 'eric-wieser', 'github-actions', 'grunweg', 'joneugster', 'leanprover-bot', 'leanprover-community-bot-assistant', 'rosborn']	nobody	1	4-35094 4 days ago	4-85032 4 days ago	237-83175 237 days
24465	adomani author:adomani	feat: a linter to enforce formatting	This linter enforces that the hypotheses of every declaration are correctly formatted. This already required multiple PRs to make mathlib compliant. Ideally, little by little the linter can be extended to format more of mathlib. --- The default linter option is `false`, but the lakefile enforces it to be `true`. This means that the linter does not run on `MathlibTest`. However, the tests should still be compliant, since the default option was `true` in development and the tests were fixed. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter maintainer-merge	876/4	Mathlib.lean,Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/Group/Nat/Defs.lean,Mathlib/Algebra/Ring/Int/Defs.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/CommandStart.lean,Mathlib/Tactic/Simps/NotationClass.lean,MathlibTest/CommandStart.lean,MathlibTest/EuclideanSpace.lean,MathlibTest/Simps.lean,MathlibTest/Traversable.lean,MathlibTest/antidiagonal.lean,MathlibTest/delabLinearIndependent.lean,MathlibTest/matrix.lean,MathlibTest/norm_num.lean,MathlibTest/set_like.lean,MathlibTest/vec_notation.lean	20	89	['Parcly-Taxel', 'adomani', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	grunweg assignee:grunweg	1	4-30689 4 days ago	27-42382 27 days ago *	40-47103 40 days *
25482	grunweg author:grunweg	chore(aesop_cat): update comment	Since mathlib includes leanprover/lean4#7448, update the comment accordingly. #25475 shows that this fast-path is still beneficial: so leave it, but update its comment accordingly. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	4/4	Mathlib/CategoryTheory/Category/Basic.lean	1	2	['JovanGerb', 'github-actions', 'grunweg']	nobody	1	4-24173 4 days ago	4-26873 4 days ago	4-26925 4 days
25265	FMLJohn author:FMLJohn	feat(Order/SupClosed): `compl_image_latticeClosure` and `compl_image_latticeClosure_eq_of_compl_image_eq_self`	The main results in this pull request are: 1. `compl_image_latticeClosure`: given any Boolean algebra `α` and `s : Set α`, `compl '' latticeClosure s` is the same as `latticeClosure (compl '' s)`; 2. `compl_image_latticeClosure_eq_of_compl_image_eq_self`: given any Boolean algebra `α` and `s : Set α` such that `compl '' s = s`, we have `compl '' latticeClosure s = latticeClosure s`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-order	59/1	Mathlib/Order/SupClosed.lean	1	8	['FMLJohn', 'YaelDillies', 'github-actions']	bryangingechen assignee:bryangingechen	1	4-22149 4 days ago	7-2121 7 days ago	11-11741 11 days
25369	Paul-Lez author:Paul-Lez	feat(Order/Fin/CircularOrder): add some basic results about the circular order on Fin	Co-authored-by: Oliver Nash --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	33/0	Mathlib.lean,Mathlib/Order/Circular.lean,Mathlib/Order/Fin/CircularOrder.lean	3	11	['Paul-Lez', 'YaelDillies', 'eric-wieser', 'github-actions']	bryangingechen assignee:bryangingechen	1	4-22121 4 days ago	4-22121 4 days ago	2-19068 2 days
25172	eric-wieser author:eric-wieser	feat: restricting `Affine.Simplex` to an affine subspace that contains it	Also removes a redundant `Nonempty` argument. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-euclidean-geometry	68/5	Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Basic.lean,Mathlib/LinearAlgebra/AffineSpace/Independent.lean	2	10	['eric-wieser', 'github-actions', 'jsm28', 'ocfnash']	nobody	1	4-16192 4 days ago	15-26171 15 days ago	15-67045 15 days
25255	Raph-DG author:Raph-DG	feat(RingTheory): Order of vanishing in a ring	In this PR we define the order of vanishing of a ring and its extension to elements of the function field (as in stacks project 02MD) as well as some basic API. Note that I'm slightly unsure that some of the lemmas used to prove this are at the right level of generality, and further I'm not quite sure where some of these lemmas belong (as indicated by the comments in the main OrderOfVanishing.lean file). Any comments about this would be very much appreciated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge new-contributor t-algebra RFC label:t-algebra$	247/0	Mathlib.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/OrderOfVanishing.lean	6	83	['Raph-DG', 'chrisflav', 'erdOne', 'github-actions', 'jcommelin']	nobody	1	3-81423 3 days ago	3-82009 3 days ago	10-61393 10 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 awaiting-author label:t-algebra$	74/0	Mathlib.lean,Mathlib/FieldTheory/Galois/Abelian.lean,Mathlib/NumberTheory/Cyclotomic/Gal.lean	3	6	['acmepjz', 'alreadydone', 'chrisflav', 'erdOne', 'github-actions', 'xroblot']	nobody	2	3-50620 3 days ago	36-34663 1 month ago	29-68817 29 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	8	['github-actions', 'grunweg', 'mathlib-bors', 'ocfnash']	nobody	1	3-43644 3 days ago	114-83977 3 months ago	15-25642 15 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	13	['adomani', 'b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	1	3-43553 3 days ago	87-17765 2 months ago	15-14325 15 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/)	new-contributor t-algebra delegated label:t-algebra$	213/0	Mathlib.lean,Mathlib/FieldTheory/Minpoly/ConjRootClass.lean,Mathlib/FieldTheory/Minpoly/IsConjRoot.lean	3	16	['LessnessRandomness', 'Vierkantor', 'alreadydone', 'github-actions', 'grunweg', 'mathlib-bors']	Vierkantor assignee:Vierkantor	2	3-43512 3 days ago	14-19065 14 days ago	94-8480 94 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	8	['eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors', 'urkud']	nobody	1	3-20874 3 days ago	77-76255 2 months ago	0-12104 3 hours
25059	s235282 author:s235282	feat(Combinatorics/SimpleGraph/Bipartite): a graph is 2-colorable iff it's bipartite	Define a predicate for a simple graph to be bipartite (`def IsBipartite (G : SimpleGraph V) : Prop := G.Colorable 2`) and prove ` G.IsBipartite ↔ ∃ s t : Set V, G.IsBipartiteWith s t`. --- This is my first attempt at contributing to mathlib and therefore I have a couple of points of uncertainty related to: - Naming conventions for theorems - Seeing a lot of isBipartite vs IsBipartite in the original work. What do we want to go with when? - Definition placement - Where should I put the IsBipartite definition. - Structure of biimplication theorems - Should I combine the different lemmas into 1 bgi theorem? Feedback is greatly appreciated :) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import maintainer-merge new-contributor t-combinatorics	36/3	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean	1	30	['YaelDillies', 'github-actions', 'mitchell-horner', 's235282']	nobody	2	2-36455 2 days ago	2-37002 2 days ago	8-84432 8 days
24261	Paul-Lez author:Paul-Lez	chore: replace `WithLp.equiv` with a new pair `WithLp.toLp`/`WithLp.ofLp`	This PR does the following: - deprecate `WithLp.equiv` - Add `WithLp.toLp` and `WithLp.ofLp` (for consistency with other equivalences to type synonyms) See [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/defeq.20abuse.20in.20.60WithLp.60) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	759/366	Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Calculus/ContDiff/WithLp.lean,Mathlib/Analysis/Calculus/FDeriv/WithLp.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/ProdL2.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/Normed/Algebra/UnitizationL1.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/Analysis/RCLike/Inner.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/LinearAlgebra/Matrix/LDL.lean,Mathlib/LinearAlgebra/Matrix/Spectrum.lean,Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean,Mathlib/MeasureTheory/Measure/Haar/OfBasis.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,MathlibTest/EuclideanSpace.lean	24	50	['Paul-Lez', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	1	2-35204 2 days ago	2-35224 2 days ago	33-31560 33 days
24661	edegeltje author:edegeltje	feat(Tactic/Algebraize): Allow the `algebraize` tactic to use lemmas which don't (directly) mention RingHom	This PR allows the `algebraize` tactic to be applied in more cases. Specifically, in cases where the assumption is not (directly) about RingHom, it should still be able to apply lemmas. Written at the suggestion of @chrisflav , with the following example usecase: ```lean-4 import Mathlib open AlgebraicGeometry attribute [algebraize flat_of_flat] Flat -- pretend this is added where `AlgebraicGeometry.Flat` is defined lemma flat_of_flat {R S : Type u} [CommRing R] [CommRing S] (f : R →+* S) (h : Flat (Spec.map (CommRingCat.ofHom f))) : @Module.Flat R S _ _ f.toAlgebra.toModule := by have : f.Flat := sorry -- supposedly, this is true. ask christian. algebraize [f] assumption set_option tactic.hygienic false -- allow the tactic to produce accessible names for testing example {R S : Type u} [CommRing R] [CommRing S] (f : R →+* S) (h : Flat (Spec.map (CommRingCat.ofHom f))) : True := by algebraize [f] guard_hyp algebraizeInst : Module.Flat R S -- used to fail, succeeds now trivial ``` the key changes that makes this possible are the following: - a different way of making lemma/type applications, creating a term which can be added to the context - a different way of checking that the previously mentioned term actually relevant w/r/t the arguments provided to the tactic The previous check was ad-hoc and flimsy, making requirements of the precise order and the types of the arguments of lemmas or definitions, which resulted in the lemma being applicable in limited cases only. Now we still have some requirements, but these are less stringent. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author enhancement	147/62	Mathlib/Tactic/Algebraize.lean,MathlibTest/algebraize.lean	2	34	['callesonne', 'chrisflav', 'edegeltje', 'github-actions']	nobody	1	2-35124 2 days ago	2-35124 2 days ago	26-65389 26 days
25094	grunweg author:grunweg	feat(Tactic/Positivity): extend EReal support for numeric casts	Extend `pos_of_isNat` and `nonneg_of_isNat` to cover monoids which are not necessarily semirings, like EReal. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/.22Missing.20Tactics.22.20list/near/519660424) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	70/36	Mathlib/Tactic/Positivity/Core.lean,MathlibTest/positivity.lean	2	19	['Paul-Lez', 'YaelDillies', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	nobody	1	2-34924 2 days ago	2-34924 2 days ago	13-6021 13 days
25089	Bergschaf author:Bergschaf	feat(Order/Sublocale): definition of sublocales	There are several possible definition of sublocales. I used one from [nlab](https://ncatlab.org/nlab/show/sublocale) which states that a sublocale is a subset of a locale which is closed under all meets and for any ∈ S and x ∈ X, we have x ⇨ s ∈ S. This PR also includes an order isomorphism between (Nucleus)ᵒᵈ and Sublocale. --- I am open to better name suggestions for the order isomorphism. - [x] depends on: #24941 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-order	265/8	Mathlib.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/Nucleus.lean,Mathlib/Order/Sublocale.lean,Mathlib/Order/Synonym.lean,docs/references.bib	6	71	['Bergschaf', 'YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'xhalo32']	nobody	1	2-955 2 days ago	2-955 2 days ago	15-66778 15 days
25501	eric-wieser author:eric-wieser	fix: eliminate metadata in linarith	Otherwise this interferes with the `answer()` elaborator from formal-conjectures. Diagnosed using #25500. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta delegated bug	7/1	Mathlib/Tactic/Linarith/Parsing.lean,MathlibTest/linarith.lean	2	8	['adomani', 'b-mehta', 'github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors']	nobody	1	1-85708 1 day ago	2-1462 2 days ago	1-78612 1 day
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	58	['eric-wieser', 'girving', 'github-actions', 'quangvdao', 'tomaz1502']	nobody	1	1-15090 1 day ago	138-13504 4 months ago	138-13495 138 days
24382	joelriou author:joelriou	feat(CategoryTheory): pseudofunctors from strict bicategories	This PR provides an API for pseudofunctors `F` from a strict bicategory `B`. In particular, this shall apply to pseudofunctors from locally discrete bicategories. We first introduce more flexible variants of `mapId` and `mapComp`: for example, if `f` and `g` are composable morphisms and `fg` is such that `h : fg = f ≫ f`, we provide an isomorphism `F.mapComp' f g fg h : F.map fg ≅ F.map f ≫ F.map g`. We study the compatibilities of these isomorphisms with respect to composition with identities and associativity. Secondly, given a commutative square `t ≫ r = l ≫ b` in `B`, we construct an isomorphism `F.map t ≫ F.map r ≅ F.map l ≫ F.map b`. Co-authored-by: Christian Merten --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-category-theory	168/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean	3	17	['callesonne', 'erdOne', 'github-actions', 'joelriou']	nobody	1	1-12557 1 day ago	1-78341 1 day ago	44-5911 44 days
24530	chrisflav author:chrisflav	feat(RingTheory): faithfully flat ring maps	Co-authored by: Joël Riou --- - [x] depends on: #24375 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	92/1	Mathlib.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/RingTheory/RingHom/FaithfullyFlat.lean,Mathlib/RingTheory/RingHom/Flat.lean	4	4	['chrisflav', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1	0-42212 11 hours ago	30-36220 30 days ago	30-37286 30 days
25050	linesthatinterlace author:linesthatinterlace	feat: Add `Vector`/`List.Vector` equivalence	Adds an equivalence between `Vector` and `List.Vector`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	125/17	Mathlib/Data/Vector/Basic.lean,Mathlib/Data/Vector/Defs.lean,Mathlib/Logic/Equiv/Array.lean	3	57	['digama0', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	1	0-37494 10 hours ago	0-40379 11 hours ago	6-55239 6 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	313-42770 10 months ago	326-52367 10 months ago	1-73101 1 day
12608	eric-wieser author:eric-wieser	feat: allow `nsmul` / `zsmul` to be omitted again, with a warning	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-meta merge-conflict awaiting-author label:t-algebra$	118/2	Mathlib.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/DefaultFieldLinter.lean,scripts/noshake.json,test/default_field_linter.lean	6	12	['YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions']	nobody	1	313-42770 10 months ago	362-37834 11 months ago	5-72414 5 days
8519	eric-wieser author:eric-wieser	refactor(LinearAlgebra/TensorProduct): golf using `liftAddHom`	This new `TensorProduct.liftAddHom` doesn't require bilinearity, only that scalar multiplication can be moved between the arguments. While in theory we only need the `AddMonoidHom` version as it offers exactly the same generality, we first provide an unbundled `liftFun` as this seems to give a sizeable performance boost if used in downstream `lift` variants. --- - [x] depends on: #8571 - [x] depends on: #8584 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	313-42767 10 months ago	462-15082 1 year ago	5-6524 5 days
9146	laughinggas author:laughinggas	feat(Data/ZMod/Defs): Topological structure on `ZMod`	Added a discrete topology structure to `ZMod n` for all `n` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	313-42767 10 months ago	494-50895 1 year ago	7-6153 7 days
6777	adomani author:adomani	chore(CovariantClass): replace eta-expanded (· ·), (· + ·), (· ≤ ·), (· < ·)	Replace `CovariantClass X X (· * ·) (· ≤ ·)` with -> `CovariantClass X X HMul.hMul LE.le` and similarly for `HAdd`, `LT`, `Contravariant`. This PR is inspired by [Issue #6646](https://github.com/leanprover-community/mathlib4/issues/6646) and, more specifically, [this comment](https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1692792066). Note that https://github.com/leanprover/lean4/pull/2267 would make this unnecessary --- ```bash # First sed command: # the first captured pattern is `CovariantClass ` # the second captured pattern is `` # the third captured pattern is `+` or `` # the fourth captured pattern is `<` or `≤` # a match for `CovariantClass (· ·) (· ·)` becomes # `CovariantClass replaceop replaceop` # Second sed command: similar to the first, but looks for `(Function.swap (· ·))` sed -i ' s=$Co[ntra]variantClass \(..$ \2 \)(· $[+]$ ·) (· $[<≤]$ ·)=\1replaceop\3 replaceop\4=g s=$Co[ntra]variantClass \(..$ \2 \)($[Functio\.swap ]$(· $[+]$ ·)) (· $[<≤]$ ·)=\1(\3replaceop\4) replaceop\5=g s=replaceop+=HAdd.hAdd=g s=replaceop\=HMul.hMul=g s=replaceop<=LT.lt=g s=replaceop≤=LE.le=g s=$Co[ntra]variantClass N N$ (· \ ·) r=\1 HMul.hMul r=g s=$Co[ntra]variantClass N N (swap μ)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass N N$ (swap (· \* ·)) r=\1 (swap HMul.hMul) r=g s=$CovariantClass (Filter α) (Filter α)$ (· / ·) (· ≤ ·)=\1 HDiv.hDiv LE.le=g s=$CovariantClass (Filter α) (Filter α)$ (swap (· / ·)) (· ≤ ·)=\1 (swap HDiv.hDiv) LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· < ·)=\1 LT.lt=g s=$Co[ntra]variantClass [^}]$ (· ≤ ·)=\1 LE.le=g s=$CovariantClass .* (Filter β)$ (· • ·) LE.le=\1 HSMul.hSMul LE.le=g ' $(git ls-files '*.lean') ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	703/678	Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/Bounds.lean,Mathlib/Algebra/CovariantAndContravariant.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/GroupPower/Order.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Archimedean.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/MinMax.lean,Mathlib/Algebra/Order/Group/OrderIso.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Interval.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/LatticeGroup.lean,Mathlib/Algebra/Order/Module.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Cancel/Defs.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Lemmas.lean,Mathlib/Algebra/Order/Monoid/MinMax.lean,Mathlib/Algebra/Order/Monoid/NatCast.lean,Mathlib/Algebra/Order/Monoid/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Prod.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithZero/Basic.lean,Mathlib/Algebra/Order/Monoid/WithZero/Defs.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Pointwise.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Lemmas.lean,Mathlib/Algebra/Order/Sub/Basic.lean,Mathlib/Algebra/Order/Sub/Canonical.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Order/WithZero.lean,Mathlib/Algebra/Parity.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Normed/Order/Lattice.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/List/BigOperators/Basic.lean,Mathlib/Data/List/BigOperators/Lemmas.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Nat/Cast/Order.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/Real/ENNReal.lean,Mathlib/Data/Real/NNReal.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/Data/Sign.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/VectorMeasure.lean,Mathlib/Order/ConditionallyCompleteLattice/Group.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Martingale/Basic.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/PGame.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/NaturalOps.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Topology/ContinuousFunction/Algebra.lean,lean-toolchain,test/Recall.lean,test/propose.lean	81	36	['adomani', 'alreadydone', 'digama0', 'eric-wieser', 'ericrbg', 'jcommelin', 'leanprover-bot', 'sgouezel']	nobody	1	313-42766 10 months ago	335-23470 11 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	313-42765 10 months ago	371-86235 1 year ago	13-18399 13 days
3757	thorimur author:thorimur	feat: config options for `fail_if_no_progress`	This PR creates config options for `fail_if_no_progress` that allow the user to tweak what exactly counts as "progress". This includes whether to use defeq or `BEq`, what transparency to use, and which parts of the goal and local context to check. It also splits off the comparison functionality into `Mathlib.Lean.Meta.Compare`, which provides fully configurable comparison functions for common complex metaprogramming types not specific to `fail_if_no_progress`. These types are `Expr`, `LocalDecl`, `LocalContext`, `MetavarDecl`, `MVarId`, and `List MVarId`. --- See [zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/progress.20on.20fail_if_no_progress) for a couple review questions. Status update: this PR is now basically done, save for some extra tests which should probably be included. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict WIP	603/54	Mathlib.lean,Mathlib/Lean/Meta.lean,Mathlib/Lean/Meta/Compare.lean,Mathlib/Tactic/FailIfNoProgress.lean,test/fail_if_no_progress.lean	5	38	['alexjbest', 'github-actions', 'joneugster', 'kim-em', 'thorimur']	nobody	1	313-42764 10 months ago	565-53950 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	294-20067 9 months ago	299-36309 9 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	294-9120 9 months ago	294-84667 9 months ago	7-18420 7 days
11800	JADekker author:JADekker	feat : Define KappaLindelöf spaces	Define KappaLindelöf spaces by following the first one-third of the API for Lindelöf spaces. The remainder will be added in a future PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-topology merge-conflict please-adopt	301/2	Mathlib.lean,Mathlib/Topology/Compactness/KappaLindelof.lean,Mathlib/Topology/Compactness/Lindelof.lean	3	38	['ADedecker', 'JADekker', 'PatrickMassot', 'StevenClontz', 'adomani', 'github-actions', 'grunweg', 'kim-em', 'urkud']	nobody	1	266-54938 8 months ago	266-76913 8 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	244-55902 8 months ago	244-55902 8 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	219-35924 7 months ago	219-35924 7 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	206-41972 6 months ago	206-41972 6 months ago	63-69206 63 days
17176	arulandu author:arulandu	feat: integrals and integrability with .re	Lemmas for swapping order of .re and integration/integrability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict awaiting-author	49/0	Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean	4	30	['EtienneC30', 'arulandu', 'github-actions', 'loefflerd']	nobody	1	131-4299 4 months ago	131-4299 4 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	130-20459 4 months ago	564-80146 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	112-82253 3 months ago	113-27024 3 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	112-54631 3 months ago	188-47813 6 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	110-54008 3 months ago	110-54008 3 months ago	52-25108 52 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	83-31960 2 months ago	83-31960 2 months 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	83-31489 2 months ago	83-31489 2 months 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	80-62087 2 months ago	80-62087 2 months 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	80-61842 2 months ago	80-61842 2 months ago	47-37012 47 days
19275	eric-wieser author:eric-wieser	fix: if nolint files change, do a full rebuild	Otherwise CI will succeed when removing entries from the file, but fail later when someone changes something unrelated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict delegated	8/0	lakefile.lean	1	20	['YaelDillies', 'adomani', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	1	66-20303 2 months ago	66-20303 2 months ago	0-214 3 minutes
23411	PatrickMassot author:PatrickMassot	chore: remove finiteness from Order.Filter.Lift	Co-authored-by: Anatole Dedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	longest-pole t-topology merge-conflict	48/21	Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Order/Filter/Lift.lean,Mathlib/Order/Filter/SmallSets.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Basic.lean	7	4	['Vierkantor', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	1	62-38370 2 months ago	62-57939 2 months ago	10-21608 10 days
19425	hrmacbeth author:hrmacbeth	perf: gcongr forward-reasoning adjustment	This PR changes the "forward-reasoning" component of `gcongr`, rendering it more efficient, particularly in problems with a large number of variables/hypotheses in the context. Previously `gcongr` attempted to match every `LocalDecl` against every node in the parse tree using each of the five implemented `@[gcongr_forward]` mini-tactics: matching directly, matching after applying `symm`, matching after applying `le_of_lt`, etc etc. The new algorithm filters out the non-Prop `LocalDecl`s, and also adjusts the `@[gcongr_forward]` extensions so that, rather than re-apply the relevant lemmas (`symm`, `le_of_lt`, etc) at every node in the parse tree, the lemmas are applied in advance to the `LocalDecl`s and the result (if successful) stored. The performance effect on mathlib as a whole is miniscule, but it speeds up the profiler's count of "tactic execution of Mathlib.Tactic.GCongr" in the newly-added test from 257 ms to 47 ms, and has a similar effect on real-life examples in an analysis project of mine. Co-authored-by: Mario Carneiro --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) (Note that Mario provided the ideas but not the code, so please review with appropriate diligence!)	merge-conflict awaiting-author	130/59	Mathlib/Order/Lattice.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GCongr/ForwardAttr.lean,MathlibTest/GCongr/inequalities.lean	4	17	['Vierkantor', 'github-actions', 'hrmacbeth', 'leanprover-bot', 'leanprover-community-bot-assistant']	Vierkantor assignee:Vierkantor	1	60-36821 1 month ago	60-36823 1 month ago	4-16654 4 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	53-16899 1 month ago	53-16899 1 month ago	1-7552 1 day
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 merge-conflict 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	13	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	1	47-25576 1 month ago	47-25578 1 month ago	46-65043 46 days
8370	eric-wieser author:eric-wieser	refactor(Analysis/NormedSpace/Exponential): remove the `𝕂` argument from `exp`	This argument is still needed for almost all the lemmas, which means it can longer be found by unification. We keep around `expSeries 𝕂 A`, as it's needed for talking about the radius of convergence over different base fields. This is a prerequisite for #8372, as we can't merge the functions until they have the same interface.\ Zulip thread: [#mathlib4 > Real.exp @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Real.2Eexp/near/401602245) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This is started from the mathport output on https://github.com/leanprover-community/mathlib/pull/19244	awaiting-zulip t-analysis merge-conflict	432/387	Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/Analysis/Normed/Algebra/QuaternionExponential.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/NormedSpace/DualNumber.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean	11	29	['YaelDillies', 'eric-wieser', 'girving', 'github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-community-bot-assistant', 'urkud']	nobody	1	45-69965 1 month ago	57-12195 1 month ago	29-60989 29 days
19315	quangvdao author:quangvdao	feat(Data/Finsupp/Fin): Add `Finsupp` operations on `Fin` tuple	This PR adds more analogues of operations on `Fin` tuples to the `Finsupp` setting. Before, there were only `Finsupp.cons` and `Finsupp.tail`. Now there are also `Finsupp.snoc`, `Finsupp.insertNth`, `Finsupp.init`, and `Finsupp.removeNth`. These all come with supporting lemmas. I also removed the porting comment about `succAboveCases` in `Data/Fin/Basic`, and added a lemma about `succAbove` in `Data/Fin/Tuple/Basic`. --- - [x] depends on: #20361 - [x] depends on: #20771 - [x] depends on: #20770 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict awaiting-author	193/16	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Data/Finsupp/Fin.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,scripts/nolints_prime_decls.txt	6	44	['YaelDillies', 'github-actions', 'j-loreaux', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'quangvdao']	nobody	1	33-79826 1 month ago	33-79826 1 month ago	43-81255 43 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	13	['YaelDillies', 'github-actions', 'grunweg', 'vihdzp']	nobody	1	33-79798 1 month ago	80-58425 2 months ago	36-50134 36 days
7907	urkud author:urkud	feat: introduce `NthRoot` notation class	Also use it for `Real.sqrt`, and replace the few occurrences of `sqrt` that do not already use the notation. --- [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/.60Sqrt.60.20notation.20typeclass/near/400086502) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis awaiting-CI merge-conflict label:t-algebra$	193/156	Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1960Q2.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Mathlib.lean,Mathlib/Algebra/NthRoot.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Asymptotics.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Data/Real/GoldenRatio.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/ConvexBody.lean,Mathlib/NumberTheory/NumberField/ClassNumber.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/Probability/Distributions/Gaussian.lean,MathlibTest/positivity.lean	28	9	['eric-wieser', 'github-actions', 'kmill', 'urkud']	nobody	1	32-20540 1 month ago	286-34098 9 months ago	0-0 0 seconds
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	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	31-13200 1 month ago	31-13202 1 month ago	0-344 5 minutes
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 merge-conflict awaiting-author	244/0	Mathlib.lean,Mathlib/Combinatorics/Flow/Basic.lean,docs/references.bib	3	57	['Shreyas4991', 'YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak', 'niklasmohrin']	nobody	1	25-70063 25 days ago	25-70065 25 days ago	86-21072 86 days
17129	joneugster author:joneugster	feat(Tactic/Linter): add unicode linter for unicode variant-selectors	Unicode characters can be followed by one of the two "variant-selectors" `\FE0E` (text) or `\FE0F` (emoji). These appear to the user as a single unicode character and they might copy them by accident. For example `✅️` (`\u2705\uFE0F`), `✅` (`\u2705`) and `✅︎` (`\u2705\uFE0E`) are three variants of the "same" unicode character. The one without variant-selector might display as either emoji or not, depending on the user's device and font. Add unicode linter ensuring variant-selector only appear on specified characters and also ensuring these characters always have the correct variant selector to avoid confusions. Everything flagged by this linter can be fixed fully automatically with `lake exe lint-style --fix` or by commenting `bot fix style` on the PR. --- - tracking PR: #16215 ## Zulip discussions: - https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F - https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Lean.20specific.20font ## Related PRs: - leanprover/lean4#5015 added some emoji-variant selectors to Emojis used in `Lean` itself. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict delegated awaiting-author	245/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnicodeLinter.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CongrM.lean,Mathlib/Tactic/Widget/Conv.lean,Mathlib/Tactic/Widget/GCongr.lean,Mathlib/Topology/ContinuousMap/Weierstrass.lean,MathlibTest/LintStyleTextBased.lean	11	25	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant']	nobody	1	24-14325 24 days ago	24-14327 24 days ago	82-54712 82 days
21476	grunweg author:grunweg	feat(lint-style): enable running on downstream projects	Enable lint-style to run on downstream projects, by making the following modifications: - allow passing an explicit list of libraries to lint: if nothing is passed, it lints `Mathlib`, `Archive` and `Counterexamples` (as before); otherwise, it lints precisely the passed modules - only check init imports, undocumented scripts and the errors from `lint-style.py` when linting Mathlib - make the style exceptions file configurable and optional: using the `nolints-file` flag, the exceptions file can be configured. If the flag is omitted, we try to find a file at `scripts/nolints-style.txt` --- and otherwise proceed with no style exceptions. This means mathlib can continue unchanged, and downstream projects can either add an explicit exceptions file, or proceed without any exceptions. After this PR, one should be able to run lint-style on a downstream project by `lake exe lint-style ProjectName`. Prompted by [this zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/lint-style.20for.20downstream.20libraries). --- - [ ] depends on: #24570 - [ ] depends on: #24953 (I did not test the last part.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	58/19	Mathlib/Tactic/Linter/TextBased.lean,scripts/lint-style.lean	2	19	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	joneugster assignee:joneugster	1	14-27655 14 days ago	14-27658 14 days ago	43-17409 43 days
24965	erdOne author:erdOne	refactor: Make `IsLocalHom` take unbundled map	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-algebra merge-conflict awaiting-author label:t-algebra$	16/7	Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace/HasColimits.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean	5	6	['alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	1	6-62766 6 days ago	6-62767 6 days ago	10-26015 10 days
24789	Ruben-VandeVelde author:Ruben-VandeVelde	chore: move Algebra.Group.Hom.End to Algebra.Ring	--- [![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$	55/50	Mathlib.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Ring/Hom/End.lean	5	6	['Ruben-VandeVelde', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	1	0-5911 1 hour ago	0-5913 1 hour ago	0-1530 25 minutes

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	377-45937 1 year ago	377-45989 1 year ago	0-0 0 seconds
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	313-42773 10 months ago	326-79221 10 months ago	3-28223 3 days
14583	lecopivo author:lecopivo	fix: make concrete cycle notation local	fix: make c[...] notation for concrete cycles local --- The notation for concrete cycles prevents you using `c[i]` notation for `c : Array _` This currently does not work ``` import Mathlib variable (c : Array Nat) (i : Fin c.size) #check c[i] -- breaks because of notation for concrete cycles ``` This PR just marks it as local to prevent this issue. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	1/1	Mathlib/GroupTheory/Perm/Cycle/Concrete.lean	1	2	['eric-wieser', 'github-actions']	nobody	313-42773 10 months ago	334-78023 10 months ago	0-12793 3 hours
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	313-42772 10 months ago	329-10776 10 months ago	12-17890 12 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	313-42772 10 months ago	341-23940 11 months ago	0-0 0 seconds
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	313-42772 10 months ago	328-80342 10 months ago	10-36842 10 days
12952	adomani author:adomani	test: length statistics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	test-ci WIP	124/0	.github/workflows/mathlib_stats.yml,.github/workflows/ml_stats_label.yaml,scripts/mathlib_stats.sh	3	9	['github-actions']	nobody	313-42771 10 months ago	342-15451 11 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	313-42770 10 months ago	339-85492 11 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	313-42770 10 months ago	335-23470 11 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	313-42770 10 months ago	unknown	unknown
11991	adomani author:adomani	draft: syntax data linter	A linter that prints `SyntaxNodeKind`s and `Range`s for all the nodes of a command. See this [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/undocumented.20things). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	152/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SyntaxDataLinter.lean	3	0	[]	nobody	313-42769 10 months ago	342-15444 11 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	313-42769 10 months ago	368-30727 1 year ago	58-85902 58 days
10998	hmonroe author:hmonroe	feat(Logic): Arithmetization of partial recursive functions (toward Gödel's first incompleteness theorem)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic awaiting-author	364/0	Mathlib.lean,Mathlib/Logic/Godel/PartArith.lean	2	3	['Ruben-VandeVelde', 'YaelDillies']	nobody	313-42768 10 months ago	368-14004 1 year ago	97-20483 97 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	313-42768 10 months ago	486-73185 1 year 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	313-42767 10 months ago	507-84013 1 year ago	12-86009 12 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	313-42767 10 months ago	401-75134 1 year ago	0-0 0 seconds
9510	eric-wieser author:eric-wieser	feat(Analysis/Calculus/DualNumber): Extending differentiable functions to dual numbers	This shows that this operation preserves multiplication and composition --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis awaiting-CI WIP label:t-algebra$	119/0	Mathlib/Analysis/Calculus/DualNumber.lean	1	4	['github-actions']	nobody	313-42767 10 months ago	519-30798 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	313-42767 10 months ago	475-23932 1 year ago	51-80670 51 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	313-42766 10 months ago	381-9295 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	313-42766 10 months ago	594-44290 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	313-42766 10 months ago	623-30507 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	313-42766 10 months ago	649-72037 1 year ago	0-0 0 seconds
4786	thorimur author:thorimur	feat: AppBuilder utils	This supplements `Lean.Meta.AppBuilder`, introducing variants of `mkAppN` and `mkAppM` which allow for more fine-grained management of existing and created metavariables. [Description pending] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	205/0	Mathlib.lean,Mathlib/Lean/Meta/AppBuilder.lean	2	0	[]	nobody	313-42765 10 months ago	733-43119 2 years ago	0-0 0 seconds
5745	alexjbest author:alexjbest	feat: a tactic to consume type annotations, and make constructor nicer	During the copenhagen masterclass I found some situations where applying the constructor tactic left the goal in a difficult to read state when autoParams were present. We add a simple tactic to clean these up, and a macro for `constructor` to behave more like the constructor notation and do this automatically (constructor is in core) It seems that these things should be cleaned up by simp, but a simp lemma to remove these annotations is not accepted by lean as the types are too similar. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	41/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Consume.lean,test/consume.lean	4	4	['alexjbest', 'digama0', 'kim-em', 'kmill']	nobody	313-42765 10 months ago	398-6259 1 year ago	51-33797 51 days
15224	AnthonyBordg author:AnthonyBordg	feat(CategoryTheory/Sites): covering families and their associated Grothendieck topology	Define covering families on a category and their associated Grothendieck topology by using the API for `Coverage`. Give an explicit characterization of the covering sieves of the said topology. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	112/0	Mathlib.lean,Mathlib/CategoryTheory/Sites/CoveringFamilies.lean	2	20	['AnthonyBordg', 'adamtopaz', 'dagurtomas', 'github-actions', 'joelriou']	nobody	308-17782 10 months ago	313-11447 10 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	299-37050 9 months ago	299-37104 9 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	298-43126 9 months ago	298-43126 9 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	298-35158 9 months ago	298-35158 9 months ago	6-38745 6 days
14733	jjaassoonn author:jjaassoonn	feat(RingTheory/Flat/CategoryTheory): a module is flat iff tensoring preserves finite limits	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-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	298-33109 9 months ago	298-33109 9 months ago	6-6256 6 days
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	298-32654 9 months ago	298-32654 9 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	298-32507 9 months ago	298-32507 9 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	298-32351 9 months ago	298-32351 9 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	298-32307 9 months ago	298-32307 9 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	298-32306 9 months ago	298-32306 9 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	298-32221 9 months ago	298-32221 9 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	298-31831 9 months ago	298-31831 9 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	298-31811 9 months ago	298-31811 9 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	298-31793 9 months ago	298-31794 9 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	298-30620 9 months ago	298-30620 9 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	297-9684 9 months ago	297-9684 9 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	297-9670 9 months ago	297-9670 9 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	294-43251 9 months ago	294-43253 9 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	294-19535 9 months ago	396-21620 1 year 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	294-19410 9 months ago	298-32336 9 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	292-22186 9 months ago	507-41653 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	291-29903 9 months ago	313-30559 10 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	290-38431 9 months ago	299-77361 9 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	284-20715 9 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	284-1952 9 months ago	284-1952 9 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	281-31957 9 months ago	281-31957 9 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	280-81302 9 months ago	312-40561 10 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	280-11695 9 months ago	284-45204 9 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	279-66821 9 months ago	279-66821 9 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	273-18561 9 months ago	273-63809 9 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	272-10553 8 months ago	424-23291 1 year ago	55-82183 55 days
14704	Command-Master author:Command-Master	feat(FieldTheory): define typeclass for simple extensions, and prove some properties	Define `SimpleExtension F K`, which says that `K` is a simple field extension of `F`, and show that together with transcendentality it implies `IsFractionRing F[X] K`. --- - [x] depends on: #14710 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author WIP label:t-algebra$	120/0	Mathlib.lean,Mathlib/FieldTheory/SimpleExtension.lean	2	17	['Command-Master', 'acmepjz', 'github-actions', 'leanprover-community-mathlib4-bot', 'tb65536']	nobody	267-38003 8 months ago	267-38003 8 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	262-41519 8 months ago	267-38237 8 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	258-20363 8 months ago	258-20481 8 months ago	26-39463 26 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	237-55814 7 months ago	237-55816 7 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	232-41934 7 months ago	474-34003 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	230-13904 7 months ago	230-13904 7 months ago	31-44440 31 days
18630	tomaz1502 author:tomaz1502	feat(Computability.Timed): Formalization of runtime complexity of List.mergeSort	This PR adds the formalization of the runtime complexity of the merge sort algorithm, defined in `Data/List/Sort`. Requires: https://github.com/leanprover-community/mathlib4/pull/15451 References: - Previous PR on mathlib3: https://github.com/leanprover-community/mathlib3/pull/14494/ - First discussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/BSc.20Final.20Project/near/220647062 - Second disussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Formalization.20of.20Runtime.20Complexity.20of.20Sorting.20Algorithms/near/284184450 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	526/0	Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean,Mathlib/Computability/Timed/MergeSort.lean,Mathlib/Computability/Timed/Split.lean	5	8	['github-actions']	nobody	216-10463 7 months ago	216-10463 7 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	214-78489 7 months ago	215-3668 7 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	214-62502 7 months ago	221-74724 7 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	211-80120 6 months ago	220-33539 7 months ago	29-26213 29 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	203-16688 6 months ago	258-18608 8 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	203-6254 6 months ago	203-6264 6 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	203-5072 6 months ago	428-54619 1 year ago	5-19391 5 days
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	198-45957 6 months ago	200-34912 6 months ago	0-1356 22 minutes
18876	GabinKolly author:GabinKolly	feat(ModelTheory/Fraisse): add proof that Fraïssé limits exist	Fraïssé limits exist. --- All the preparatory work done in other files is contained in the pull request #18749, this pull request adds the work done in ModelTheory/Fraisse, the definition of the sequence of structures whose limit will be the Fraïssé limit, lemmas about this sequence, and then the proof that the limit is indeed a Fraïssé limit. - [ ] depends on: #18749 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic blocked-by-other-PR	666/5	Mathlib/ModelTheory/Bundled.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/FinitelyGenerated.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/ModelTheory/Substructures.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	184-26420 6 months ago	210-16390 6 months ago	0-37 37 seconds
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	176-56869 5 months ago	176-56946 5 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	172-85146 5 months ago	173-33855 5 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	171-71037 5 months ago	176-67852 5 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	171-7088 5 months ago	171-7126 5 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	167-79542 5 months ago	167-79542 5 months ago	0-21 21 seconds
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	157-2749 5 months ago	157-35152 5 months ago	0-0 0 seconds
20459	Ruben-VandeVelde author:Ruben-VandeVelde	chore: fix names of roots_C_mul_X_{add,sub}_C_of_IsUnit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	11/5	Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Roots.lean	2	2	['eric-wieser', 'github-actions']	nobody	152-11990 5 months ago	152-11990 5 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	151-86147 5 months ago	286-21112 9 months ago	144-63944 144 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	150-14048 4 months ago	150-14048 4 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	149-16025 4 months ago	149-16025 4 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	147-22687 4 months ago	157-25285 5 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	140-38439 4 months ago	140-38439 4 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	140-25204 4 months ago	141-26157 4 months ago	2-77310 2 days
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	137-16064 4 months ago	299-22391 9 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	137-5870 4 months ago	137-5889 4 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	136-20842 4 months ago	136-20842 4 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	135-77782 4 months ago	135-79621 4 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	135-39184 4 months ago	135-44248 4 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	135-18251 4 months ago	135-18251 4 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	133-18707 4 months ago	133-18707 4 months ago	23-30991 23 days
18749	GabinKolly author:GabinKolly	feat(ModelTheory): preparatory work for the existence of Fraïsse limits	Define the map of a PartialEquiv through an embedding, and related properties. Define embeddings and equivalences between equal structures or equal substructures, and related properties. Add miscellaneous lemmas which will be used to prove the existence of fraisse limits. --- This is preparation for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic awaiting-author	308/5	Mathlib/ModelTheory/Bundled.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/FinitelyGenerated.lean,Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/ModelTheory/Substructures.lean	5	9	['GabinKolly', 'YaelDillies', 'github-actions', 'vihdzp']	nobody	129-81564 4 months ago	140-7618 4 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	129-81288 4 months ago	129-81290 4 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	127-77423 4 months ago	149-75064 4 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	127-21293 4 months ago	127-21293 4 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	126-9606 4 months ago	126-9609 4 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	124-55644 4 months ago	124-55644 4 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	124-48975 4 months ago	124-48977 4 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	123-35566 4 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	123-29656 4 months ago	123-29656 4 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	123-29425 4 months ago	123-29425 4 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	121-62830 4 months ago	121-81004 4 months ago	2-69252 2 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	119-17922 3 months ago	119-17923 3 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	116-3145 3 months ago	116-6919 3 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	115-80628 3 months ago	137-66236 4 months ago	0-0 0 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	111-84499 3 months ago	111-84499 3 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	111-34453 3 months ago	111-34505 3 months ago	0-0 0 seconds
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	110-4536 3 months ago	110-4621 3 months 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	109-77367 3 months ago	114-58963 3 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	109-76446 3 months ago	109-76446 3 months ago	13-33168 13 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	108-86364 3 months ago	138-13477 4 months ago	0-41 41 seconds
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	106-31303 3 months ago	106-72191 3 months 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	105-61062 3 months ago	105-61064 3 months ago	0-412 6 minutes
22232	pechersky author:pechersky	feat(Algebra/Valued): `AdicExpansion.apprUpto`	--- - [ ] depends on: #22231 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	399/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	105-61060 3 months ago	105-61063 3 months 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	105-32905 3 months ago	105-32905 3 months ago	41-32344 41 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	104-27615 3 months ago	104-27615 3 months ago	87-64575 87 days
22302	CharredLee author:CharredLee	feat: add `CategoryTheory.Topos.Power`	This is a continuation of #21281 with the end goal of defining topoi in Mathlib. It introduces the notion of a power object in a category with a subobject classifier, which is a special case of an internal hom. The definition `HasPowerObjects C` contained in this PR is all that remains before `IsTopos C` can be defined. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	312/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Power.lean	2	2	['github-actions', 'joelriou']	b-mehta assignee:b-mehta	103-77642 3 months ago	103-78769 3 months ago	0-1528 25 minutes
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	103-15599 3 months ago	103-15601 3 months ago	0-822 13 minutes
21915	YaelDillies author:YaelDillies	feat: simproc for `Int.divisorsAntidiag`	Co-authored-by: Paul Lezeau --- - [x] depends on: #21912 - [x] depends on: #21991 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	101-18302 3 months ago	101-18317 3 months 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	100-73697 3 months ago	100-73760 3 months ago	0-0 0 seconds
22389	adomani author:adomani	feat: the variableVariable linter	The motivation comes from [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/style.20proposal.3A.20avoid.20.60variable.20.7BX.7D.20.2E.2E.2E.20variable.20.28X.29.60). Summarising, updating a variable binder for a single declaration can be confusing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter WIP	167/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/VariableVariable.lean,variableDeclarationVariable_replacements.py	5	1	['github-actions']	nobody	99-14764 3 months ago	101-35920 3 months 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	98-31875 3 months ago	101-27347 3 months ago	0-6513 1 hour
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	97-25322 3 months ago	97-25322 3 months ago	6-3646 6 days
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	97-14342 3 months ago	98-26041 3 months ago	0-0 0 seconds
20636	eric-wieser author:eric-wieser	feat: multiplication of intervals in rings	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	36/1	Mathlib/Algebra/Order/Interval/Basic.lean	1	16	['Timeroot', 'YaelDillies', 'eric-wieser', 'github-actions']	nobody	97-2963 3 months ago	133-6740 4 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	96-32284 3 months ago	96-32289 3 months ago	0-159 2 minutes
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	95-21116 3 months ago	95-21116 3 months ago	0-8 8 seconds
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	93-45122 3 months ago	95-14408 3 months ago	0-0 0 seconds
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	91-40449 2 months ago	92-11082 3 months ago	0-1246 20 minutes
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	91-17426 2 months ago	498-2809 1 year ago	0-0 0 seconds
22784	grunweg author:grunweg	feat: add Diffeomorph.sumSumSumComm	This matches `{Equiv,Homeomorph.sumSumSumComm}`, and is needed to prove that addition in the cobordism group is commutatives. From my bordism theory project. --- - depends on #22783 (easy pre-requisites) The current proof is not complete yet, and feels very painful. I'm not yet sure what's the best way to write this. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry WIP	50/0	Mathlib/Geometry/Manifold/Diffeomorph.lean	1	1	['github-actions']	nobody	90-85195 2 months ago	91-21539 2 months 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	90-40805 2 months ago	90-40807 2 months ago	0-0 0 seconds
22846	mattrobball author:mattrobball	test		t-analysis	2/0	Mathlib/Analysis/Normed/Module/Basic.lean	1	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	90-3303 2 months ago	90-5243 2 months ago	0-0 0 seconds
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	88-86122 2 months ago	88-86137 2 months ago	0-2391 39 minutes
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	87-22934 2 months ago	87-23115 2 months ago	87-23157 87 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	86-28245 2 months ago	86-28245 2 months ago	0-0 0 seconds
22159	shetzl author:shetzl	feat: add definition of pushdown automata	Add the definition of pushdown automata and their two acceptance conditions: acceptance based on empty stack and acceptance based on final state. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	70/0	Mathlib.lean,Mathlib/Computability/PDA.lean	2	34	['YaelDillies', 'github-actions', 'madvorak', 'shetzl']	nobody	84-38789 2 months ago	84-38789 2 months ago	20-81771 20 days
23042	joneugster author:joneugster	feat(CategoryTheory/Enriched/Limits): add HasConicalLimitsOfSize.shrink	--- Note: I've marked this "WIP" because I'm not yet sure when this will be needed and I'd probably put the PR on the queue once I've created some follow-up needing it. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos t-category-theory WIP	22/1	Mathlib/CategoryTheory/Enriched/Limits/HasConicalLimits.lean	1	1	['github-actions']	nobody	83-36901 2 months ago	83-37056 2 months ago	0-1 1 second
17587	kmill author:kmill	feat: Sym2-as-Finset theory	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	105/3	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/RingTheory/Polynomial/Vieta.lean	4	10	['FordUniver', 'YaelDillies', 'github-actions', 'kmill']	nobody	82-49314 2 months ago	82-84794 2 months ago	0-0 0 seconds
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	81-30405 2 months ago	81-30413 2 months 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	80-71961 2 months ago	100-24283 3 months 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	80-40047 2 months ago	80-40047 2 months ago	0-68906 19 hours
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	78-77423 2 months ago	78-77423 2 months ago	0-0 0 seconds
19607	madvorak author:madvorak	Block matrix totally unimodular	--- Discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/TU.20block.20matrix.20.2319607 - [ ] depends on: #19323 - [ ] depends on: #20428 - [ ] depends on: #20433 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	77-12122 2 months ago	77-12122 2 months 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	76-76838 2 months ago	76-76844 2 months ago	0-24 24 seconds
9820	jjaassoonn author:jjaassoonn	feat(RingTheory/GradedAlgebra/HomogeneousIdeal): generalize to homogeneous submodule	The definitions, constructions and theorems in `HomogeneousIdeal.lean` are generalized to a homogeneous submodules. So say $R$ is a ring and $M \cong \bigoplus_{i} M_i$ is an $R$-module. Then a homogeneous $R$-submodule of $M$ is an $R$-submodule $N$ such that for all $i$ and $n \in N$, $n_i \in N$. Note that this notion doesn't actually require $R$ to be graded and $M$ is a graded module. But for more interesting lemmas, we do need that $M$ is graded $R$-module. We bake the fact $R$ is graded into the definition of homogeneous submodule, otherwise, `CompleteLattice HomogeneousSubmodule` cannot find the order of synthesis (the proof depends on that $R$ is graded) All definitions/constructions/theorems have a copy for ideals as well, this is to make sure dot notation still works. The motivation of this generalization is graded quotient module --- - [ ] 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	74-8833 2 months ago	116-67285 3 months ago	147-32024 147 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	74-6543 2 months ago	74-6543 2 months ago	53-20069 53 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	71-1930 2 months ago	71-1930 2 months ago	0-1312 21 minutes
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	70-66429 2 months ago	115-19500 3 months ago	3-59857 3 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	69-39888 2 months ago	69-39888 2 months ago	46-55213 46 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	68-52022 2 months ago	69-39345 2 months ago	32-33842 32 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	68-33061 2 months ago	69-39581 2 months ago	46-53384 46 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	68-8190 2 months ago	unknown	unknown
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	66-22900 2 months ago	66-22900 2 months ago	23-44995 23 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	65-55617 2 months ago	119-3316 3 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	65-55522 2 months ago	176-80700 5 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	65-55133 2 months 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	65-55065 2 months ago	unknown	unknown
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	63-49756 2 months ago	116-44398 3 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	63-49444 2 months ago	63-49457 2 months 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	63-47351 2 months ago	63-49626 2 months ago	0-0 0 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	63-35146 2 months ago	64-21445 2 months ago	4-80306 4 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	63-23856 2 months ago	135-53952 4 months ago	75-64682 75 days
23772	SEU-Prime author:SEU-Prime	Create Amice.lean	i built amice equiv [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory WIP	283/0	Mathlib/NumberTheory/Padics/Amice.lean	1	2	['grunweg']	nobody	63-21594 2 months ago	63-21594 2 months ago	0-0 0 seconds
20671	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Analysis/Asymptotics/SpecificAsymptotics): Proving that 𝛔ₖ(n) = O(nᵏ⁺¹)	This PR proves a result about the $\sigma_k(n)$ arithmetic function, namely, that it is $O\left(n^{k+1}\right)$. Main theorem: `theorem sigma_asymptotic (k : ℕ) : (fun n ↦ (σ k n : ℝ)) =O[atTop] (fun n ↦ (n ^ (k + 1) : ℝ))` This result was proved as part of the sphere packing project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-number-theory awaiting-author	29/0	Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean	1	2	['b-mehta', 'github-actions']	b-mehta assignee:b-mehta	63-21305 2 months ago	73-15782 2 months ago	9-59130 9 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	63-18211 2 months ago	63-18213 2 months 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	63-15570 2 months ago	63-15583 2 months ago	0-1519 25 minutes
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	62-81686 2 months ago	unknown	unknown
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	62-54115 2 months ago	62-54115 2 months 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	62-19772 2 months ago	62-19793 2 months ago	84-10469 84 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	61-74060 2 months ago	61-74062 2 months ago	0-498 8 minutes
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	61-64816 2 months ago	61-64816 2 months ago	19-35867 19 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	61-4028 2 months ago	61-4117 2 months ago	0-23929 6 hours
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	60-13164 1 month ago	60-13164 1 month ago	0-0 0 seconds
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	59-45357 1 month ago	59-45376 1 month 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	59-45291 1 month ago	59-45310 1 month ago	22-16818 22 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	59-20722 1 month ago	59-20723 1 month ago	0-2389 39 minutes
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	59-998 1 month ago	214-63136 7 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	59-996 1 month ago	216-54247 7 months ago	0-627 10 minutes
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	58-47863 1 month ago	58-47879 1 month ago	0-0 0 seconds
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	57-70572 1 month ago	57-70614 1 month ago	176-12996 176 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	56-85506 1 month ago	56-85508 1 month ago	0-22 22 seconds
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	56-76754 1 month ago	57-28306 1 month ago	0-1 1 second
21270	GabinKolly author:GabinKolly	feat(ModelTheory/Bundled): first-order embeddings and equivalences from equalities	Add first-order embeddings and equivalences from equalities between bundled structures. --- Add two definitions to get embeddings and equivalences from equalities between bundled structures, and simple properties. This is some preparatory work for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-logic awaiting-author	102/0	Mathlib/ModelTheory/Bundled.lean	1	26	['GabinKolly', 'Vierkantor', 'YaelDillies', 'github-actions']	nobody	56-46727 1 month ago	56-46727 1 month ago	50-58472 50 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	56-38156 1 month ago	59-45489 1 month ago	0-17 17 seconds
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	55-47206 1 month ago	55-47304 1 month ago	0-70 1 minute
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	55-46051 1 month ago	55-46067 1 month ago	0-0 0 seconds
23763	grunweg author:grunweg	feat(Linter.openClassical): also lint for Classical declarations as …	…a local or scoped instance. --- - [ ] depends on: #23750 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter	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	55-37897 1 month ago	56-30759 1 month ago	56-64979 56 days
24086	mattrobball author:mattrobball	perf(Normed.Field.Basic): change parent order for `Semifield` and `Field` and reduce priority `toComm(Semi)Ring`	Passing through the projection `toComm(Semi)Ring` should not be preferred. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	8/2	Mathlib/Algebra/Field/Defs.lean	1	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	55-13364 1 month ago	55-18164 1 month ago	0-0 0 seconds
13038	adomani author:adomani	feat: Mathlib weekly reports	This PR introduces a weekly cron job that computes a "global" report on the evolution of Mathlib in the previous week. It consists of * a CI workflow with a cron job that runs at minight on Sunday (`.github/workflows/mathlib_stats.yaml`); * a Lean file extracting a categorized list of "all" the declarations in Mathlib (`scripts/count_decls.lean`); * a bash file computing Git-diff-related information and collating the data from the Lean file (`scripts/mathlib_stats.sh`); * a convenience CI workflow that is triggered on adding the `test-ci` label and results in posting on the PR and on Zulip the report (`.github/workflows/mathlib_stats_label.yaml`). The second CI workflow is intended to be removed just before/right after the PR is ready to merge. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/113488-general) [Thread for the reports](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Mathlib.20weekly.20change.20report) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI t-meta awaiting-author	338/0	.github/workflows/mathlib_stats.yaml,.github/workflows/mathlib_stats_label.yaml,scripts/count_decls.lean,scripts/mathlib_stats.sh	4	10	['adomani', 'github-actions', 'grunweg', 'kim-em', 'kmill']	nobody	54-80718 1 month ago	329-12198 10 months ago	57-4216 57 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	54-32033 1 month ago	54-32097 1 month ago	54-32080 54 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	53-71737 1 month ago	53-71739 1 month ago	2-85349 2 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	53-47945 1 month ago	53-47945 1 month ago	0-0 0 seconds
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	53-37204 1 month ago	53-83825 1 month ago	13-19789 13 days
19613	madvorak author:madvorak	refactor(Combinatorics/Optimization/ValuedCSP): make only valid `FractionalOperation` possible	Originally `FractionalOperation` was any multiset (possible empty). Then `FractionalOperation.IsValid` said it was nonempty. Instead, I would like to make it nonempty by definition. As a result, empty/invalid fractional operation couldn't be declared at all. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	14/17	Mathlib/Combinatorics/Optimization/ValuedCSP.lean	1	1	['github-actions']	nobody	52-84162 1 month ago	182-19335 6 months ago	192-6980 192 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	52-84002 1 month ago	52-84002 1 month ago	4-24257 4 days
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	52-80776 1 month ago	52-80776 1 month ago	0-0 0 seconds
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	52-14897 1 month ago	67-13701 2 months ago	0-5717 1 hour
12561	BoltonBailey author:BoltonBailey	doc: suggest !bench in `lake exe pole`	This change explains what to do if the benchmarks haven't been run. --- - [x] depends on: #12322 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		2/1	LongestPole/Main.lean	1	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	50-67996 1 month ago	unknown	unknown
24218	alreadydone author:alreadydone	chore(Algebra): remove `mid_assoc` from `IsMulCentral`	as it is a consequence of left and right associativity in the presence of commutativity. Also change the commutativity condition to use `Commute`. --- Even without commutativity, left and right associativity of an element `e` in a magma is sufficient to prove that elements of the form `e * x * e` (the "corner" of `e`) form a submagma. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	31/69	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Group/Center.lean,Mathlib/Algebra/GroupWithZero/Center.lean,Mathlib/Algebra/Ring/Center.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Algebra/Star/Center.lean,Mathlib/Algebra/Star/CentroidHom.lean,Mathlib/GroupTheory/Submonoid/Center.lean,Mathlib/LinearAlgebra/Basis/Submodule.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/RingTheory/Idempotents.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean	12	8	['alreadydone', 'github-actions', 'mans0954']	nobody	50-12169 1 month ago	50-27229 1 month ago	50-27219 50 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 awaiting-author	33/0	Mathlib/CategoryTheory/Limits/Types/Colimits.lean	1	4	['github-actions', 'joelriou', 'robertmaxton42']	nobody	49-15397 1 month ago	49-15397 1 month ago	8-28043 8 days
20689	joelriou author:joelriou	feat(AlgebraicTopology): cylinder objects in model categories	--- - [x] depends on: #20666 - [x] 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 blocked-by-other-PR WIP	820/4	Mathlib.lean,Mathlib/AlgebraicTopology/ModelCategory/Basic.lean,Mathlib/AlgebraicTopology/ModelCategory/Cylinder.lean,Mathlib/AlgebraicTopology/ModelCategory/Instances.lean,Mathlib/AlgebraicTopology/ModelCategory/IsFibrant.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	49-6791 1 month ago	49-6810 1 month ago	0-0 0 seconds
24219	Paul-Lez author:Paul-Lez	feat: linear independence of the tensor product of two linearly independent families	This is still WIP (the proofs are a little too long, and some lemmas need to be moved to other files!) From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra WIP label:t-algebra$	193/0	Mathlib/LinearAlgebra/LinearIndependent/Tprod.lean	1	1	['github-actions']	nobody	48-16595 1 month ago	48-16595 1 month ago	0-2221 37 minutes
22898	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/TensorProduct/DirectLimit/FG): direct limit of finitely generated submodules and tensor product	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	8	['AntoineChambert-Loir', 'alreadydone', 'github-actions']	nobody	47-80925 1 month ago	77-18612 2 months ago	11-9349 11 days
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 awaiting-author label:t-algebra$	388/10	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	47-46078 1 month ago	47-46094 1 month ago	13-38587 13 days
13740	YaelDillies author:YaelDillies	feat: More robust ae notation	Make sure that, when `μ : FiniteMeasure Ω`, `f =ᵐ[μ] g` elaborates to `f =ᵐ[↑μ] g` instead of complaining about `OuterMeasureClass (FiniteMeasure Ω) (Set Ω) ℝ≥0∞` not existing. [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/ae.20of.20a.20finite.20measure) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-CI t-meta	56/2	Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/OuterMeasure/AE.lean,Mathlib/MeasureTheory/OuterMeasure/BorelCantelli.lean	3	16	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'urkud']	nobody	47-41067 1 month ago	47-41082 1 month 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	190/3	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/Schwarzian/Basic.lean	3	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	47-27921 1 month ago	47-27939 1 month ago	0-0 0 seconds
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 awaiting-CI	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	47-20770 1 month ago	47-20770 1 month ago	109-5714 109 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	41	['alreadydone', 'github-actions', 'jcommelin', 'jjaassoonn', 'kbuzzard', 'qawbecrdtey']	nobody	46-70433 1 month ago	104-36114 3 months ago	20-7596 20 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/)		159/0	MathlibTest/StringDiagram.lean	1	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	46-63653 1 month ago	unknown	unknown
21616	peabrainiac author:peabrainiac	feat(Topology): concatenating countably many paths	Adds `Path.countableConcat`, the concatenation of a sequence of paths leading up to some point `x`. --- - [x] depends on: #21591 - [x] depends on: #21607 This work is a prerequisite to #20248, where it is used to show that the topology of first-countable locally path-connected spaces is coinduced by all the paths in that space. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	229/0	Mathlib.lean,Mathlib/Topology/Path/CountableConcat.lean	2	30	['YaelDillies', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'peabrainiac']	YaelDillies assignee:YaelDillies	46-36356 1 month ago	50-44290 1 month ago	56-56728 56 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	8	['Command-Master', 'Ruben-VandeVelde', 'github-actions', 'urkud', 'vihdzp']	nobody	45-69064 1 month ago	216-73142 7 months ago	10-77913 10 days
23585	plp127 author:plp127	feat: `Filter.atMax` and `Filter.atMin`	Adds `atMax` and `atMin`, filters. Making an analogy, `atMax` : `atTop` :: `IsMax` : `IsTop`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order WIP	148/0	Mathlib.lean,Mathlib/Order/Filter/AtMaxMin.lean	2	4	['github-actions', 'plp127', 'urkud']	nobody	45-59873 1 month ago	68-34531 2 months ago	0-0 0 seconds
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	83/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/Divisors.lean,MathlibTest/Simproc/Divisors.lean	4	26	['Paul-Lez', 'b-mehta', 'eric-wieser', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot']	nobody	44-58201 1 month ago	44-58201 1 month ago	9-45842 9 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 WIP	74/3	Mathlib.lean,Mathlib/Control/Lawful.lean,Mathlib/Control/Monad/AlternativeMonad.lean	3	8	['dtumad', 'eric-wieser', 'github-actions', 'quangvdao']	nobody	44-55296 1 month ago	44-55450 1 month ago	1-20563 1 day
24394	wwylele author:wwylele	feat(Analysis/Asymptotics): Add filter operation theorems to `IsEquivalent`	These are simply restating the corresponding theorems for `isLittleO`, but adding them provides better discovery when one is not familiar with how `IsEquivalent` is defined. I tagged `isEquivalent_map` as `@[simp]` because all of `isBigOWith/isBigO/isLittleO_map` are tagged, but I am not sure if this appropriate. Please let me know if I should remove the tag --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	13/0	Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean	1	1	['github-actions']	nobody	44-3314 1 month ago	44-3314 1 month ago	44-3373 44 days
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	514/19	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	43-2573 1 month ago	97-24888 3 months ago	0-358 5 minutes
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	43-2443 1 month ago	97-19201 3 months ago	0-516 8 minutes
12032	mcdoll author:mcdoll	feat: Delta distribution as a limit	--- - [x] depends on: #11496 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP	51/0	Mathlib/Analysis/Distribution/DiracDelta.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	42-74668 1 month ago	unknown	unknown
24405	mcdoll author:mcdoll	refactor(Topology/Algebra/Module/WeakDual): Clean up	- Move `Dual` and `dualPairing` lower in the import-hierachy - deduplicate `dualPairing` - Make `WeakDual` and `WeakSpace` reducible --- New version of #11500 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology	146/162	Mathlib.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Analysis/VonNeumannAlgebra/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/Topology/Algebra/Module/Dual.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,docs/overview.yaml,docs/undergrad.yaml	14	1	['github-actions']	nobody	42-65841 1 month ago	42-74534 1 month ago	42-74517 42 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 delegated	15/0	Mathlib/Analysis/Normed/Module/FiniteDimension.lean	1	3	['github-actions', 'mathlib-bors', 'urkud']	nobody	42-55626 1 month ago	42-55627 1 month ago	26-70139 26 days
24445	kbuzzard author:kbuzzard	chore: remove outParam from Valued	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Exploring the idea that Gamma_0 should not be an outParam in Valued.	t-topology WIP	4/3	Mathlib/Topology/Algebra/Valued/ValuationTopology.lean	1	2	['erdOne', 'github-actions']	nobody	41-39786 1 month ago	41-42270 1 month ago	0-0 0 seconds
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 t-meta please-adopt WIP label:t-algebra$	732/211	Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Data/Rat/Floor.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/RealSqrt.lean,Mathlib/Tactic/NormNum/Result.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Tactic/Ring/RingNF.lean,MathlibTest/norm_num.lean,MathlibTest/ring.lean	17	3	['github-actions', 'leanprover-community-mathlib4-bot', 'plp127']	nobody	41-29360 1 month ago	43-74088 1 month ago	0-0 0 seconds
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 - [x] depends on: #24439 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	356/2	Mathlib.lean,Mathlib/Data/Nat/Factorial/NatCast.lean,Mathlib/RingTheory/DividedPowers/RatAlgebra.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	41-26426 1 month ago	41-26428 1 month ago	2-68902 2 days
24157	urkud author:urkud	feat(Convex/LinearIsometry): new file	--- - [x] depends on: #24392 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	75/0	Mathlib.lean,Mathlib/Analysis/Convex/LinearIsometry.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'sgouezel']	nobody	40-41601 1 month ago	40-41601 1 month ago	10-23076 10 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	40-31248 1 month ago	64-36101 2 months ago	0-46563 12 hours
24411	joelriou author:joelriou	feat(CategoryTheory): descent of morphisms for a pseudofunctor	Let `C` be a category and `F : Pseudofunctor (LocallyDiscrete Cᵒᵖ) Cat`. Given `S : C`, and objects `M` and `N` in `F.obj (.mk (op S))`, we define a presheaf of types `F.presheafHom M N` on the category `Over S`: its sections on a object `T : Over S` corresponding to a morphism `p : X ⟶ S` are the type of morphisms `p^* M ⟶ p^* N`. We shall say that `F` satisfies the descent of morphisms for a Grothendieck topology `J` if these presheaves are all sheaves (typeclass `F.HasDescentOfMorphisms J`). Co-authored-by: Christian Merten [christian@merten.dev](mailto:christian@merten.dev) --- - [ ] depends on: #24382 - [ ] depends on: #24384 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	474/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Cat.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean,Mathlib/CategoryTheory/Sites/Descent/Morphisms.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	40-30882 1 month ago	40-30884 1 month ago	0-0 0 seconds
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 WIP	937/2	Mathlib.lean,Mathlib/CategoryTheory/Sites/Continuous.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/Basic.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/OneHypercoverDense.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/SheafEquiv.lean,Mathlib/CategoryTheory/Sites/OneHypercover.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	40-30116 1 month ago	45-85405 1 month ago	0-0 0 seconds
24489	mattrobball author:mattrobball	test			185/152	Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Eval/Degree.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Isometric.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unique.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Complex/Polynomial/Basic.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Choose/Vandermonde.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/FieldTheory/IsAlgClosed/Spectrum.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/KummerPolynomial.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/GroupTheory/SpecificGroups/Dihedral.lean,Mathlib/GroupTheory/Subgroup/Center.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Grading.lean,Mathlib/LinearAlgebra/ExteriorAlgebra/Grading.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/LinearAlgebra/RootSystem/Finite/CanonicalBilinear.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/Tactic/Ring/Basic.lean	38	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	39-81726 1 month ago	39-84159 1 month ago	0-0 0 seconds
20719	gio256 author:gio256	feat(AlgebraicTopology): delaborators for truncated simplicial notations	We add delaborators for the following notations, introduced in #20688: - `⦋m⦌ₙ`, which denotes the `m`-dimensional simplex in the `n`-truncated simplex category. - `X _⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated simplicial object `X`. - `X ^⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated cosimplicial object `X`. If `pp.proofs` is set to `true`, we also pretty-print the proof `p : m ≤ n` for all three notations as `⦋m, p⦌ₙ`, `X _⦋m, p⦌ₙ`, and `X ^⦋m, p⦌ₙ`, respectively. Credit to @kmill for one piece of code and much metaprogramming inspiration. --- - [x] depends on: #20688 - [x] depends on: #23018 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos t-category-theory t-meta	525/33	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SimplexCategory.lean,Mathlib/Util/Superscript.lean,MathlibTest/SimplexCategory.lean,MathlibTest/SimplicialObject.lean,MathlibTest/superscript.lean,scripts/noshake.json	11	22	['eric-wieser', 'gio256', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot']	eric-wieser assignee:eric-wieser	39-7178 1 month ago	39-9819 1 month ago	47-81361 47 days
14203	dagurtomas author:dagurtomas	feat(Algebra/ModuleCat): descent data	Co-authored-by: Jack McKoen Co-authored-by: Christian Merten Co-authored-by: Joël Riou Co-authored-by: Adam Topaz --- - [ ] depends on: #24530 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	workshop-AIM-AG-2024 t-algebra t-algebraic-geometry t-category-theory blocked-by-other-PR WIP label:t-algebra$	253/15	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Descent.lean,Mathlib/Algebra/Homology/ShortComplex/ExactFunctor.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/LocalProperties/Basic.lean,Mathlib/RingTheory/RingHom/FaithfullyFlat.lean,Mathlib/RingTheory/RingHom/Finite.lean,Mathlib/RingTheory/RingHom/Flat.lean,Mathlib/RingTheory/RingHom/Integral.lean,Mathlib/RingTheory/RingHom/Locally.lean,Mathlib/RingTheory/RingHom/Surjective.lean,Mathlib/RingTheory/RingHom/Unramified.lean,Mathlib/RingTheory/RingHomProperties.lean	16	3	['dagurtomas', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	38-71561 1 month ago	38-71563 1 month ago	0-0 0 seconds
24558	mattrobball author:mattrobball	test			32/30	Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Data/Matroid/Circuit.lean,Mathlib/Data/Matroid/Closure.lean,Mathlib/Data/Matroid/Loop.lean,Mathlib/Data/Set/Insert.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean,Mathlib/Order/Cover.lean	12	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	38-12041 1 month ago	38-14901 1 month ago	0-0 0 seconds
24266	plp127 author:plp127	feat(Order): `NoBotOrder α` implies `NoMinOrder α` under `IsDirected α (· ≥ ·)`	Proves that `NoBotOrder α` implies `NoMinOrder α` under `IsDirected α (· ≥ ·)`, and also the dual theorem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	14/0	Mathlib/Order/Directed.lean	1	4	['github-actions', 'plp127', 'urkud']	nobody	37-63061 1 month ago	48-74442 1 month ago	48-74426 48 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	72/18	Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean	4	4	['YaelDillies', 'b-mehta', 'github-actions']	nobody	37-49341 1 month ago	78-2650 2 months ago	2-24624 2 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/)	t-topology	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	37-46198 1 month ago	37-46198 1 month ago	70-25921 70 days
23360	kim-em author:kim-em	chore: review of `erw` in `Algebra/Homology/DerivedCategory`		t-algebra label:t-algebra$	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	37-46186 1 month ago	37-46186 1 month ago	74-57653 74 days
23503	apnelson1 author:apnelson1	feat(Topology/Instances/ENat): ENat and tsum	We give API for the interactions between `tsum` and `ENat`. The type is especially nice, because every function is summable, and there are simplifying lemmas like the statement that a sum is infinite iff either some term is infinite, or the support is infinite. This provides one of the missing pieces for working painlessly with discrete objects, 'propositional' finiteness and cardinality. For instance, one can sum a function `f : a -> ENat` over an arbitrary set with the term `∑' a : s, 1`, and it will be provable that `∑' a : s, 1 = s.encard` and `(support f).encard ≤ ∑' a, f a` without ever having to split into finite/infinite cases. As is pointed out in the module docstring for `Data.ENat`, there are strong analogies between `ENat` and `ENNReal`, and the API runs parallel to the API for `tsum`/`ENNReal`. One could call it 'duplication', but I have yet to find a common generalization of the two that saves work, or a third example of a natural type with these same properties. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology WIP	205/2	Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Set/Card.lean,Mathlib/Topology/Instances/ENat.lean	3	2	['eric-wieser', 'github-actions']	nobody	37-45222 1 month ago	37-45222 1 month ago	14-6036 14 days
22809	b-reinke author:b-reinke	feat: Category algebras and path algebras	This PR defines the category algebra of a linear category and path algebras of quivers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra t-category-theory WIP label:t-algebra$	218/0	Mathlib/Algebra/Ring/Assoc.lean,Mathlib/CategoryTheory/Linear/CategoryAlgebra.lean,Mathlib/Combinatorics/Quiver/PathAlgebra.lean,Mathlib/Data/DFinsupp/BigOperators.lean	4	2	['b-reinke', 'github-actions']	nobody	37-45186 1 month ago	37-45186 1 month ago	0-0 0 seconds
21776	alreadydone author:alreadydone	Invertible modules	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	571/26	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Module/Submodule/Equiv.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/PicardGroup.lean	5	2	['alreadydone', 'github-actions']	nobody	37-45119 1 month ago	37-45119 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 t-meta	260/28	Mathlib/Data/Ineq.lean,Mathlib/Tactic/Linarith/Datatypes.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm.lean,Mathlib/Tactic/Linarith/Preprocessing.lean,Mathlib/Util/Qq.lean	5	8	['eric-wieser', 'github-actions', 'leanprover-bot']	nobody	37-44908 1 month ago	37-44908 1 month ago	0-0 0 seconds
14348	eric-wieser author:eric-wieser	perf: disable the `unusedVariables` linter for speed	I doubt we want to merge this, but it shaves two minutes of the lint time. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	performance-hack	1/0	lakefile.lean	1	3	['eric-wieser', 'github-actions', 'leanprover-bot']	nobody	37-44216 1 month ago	37-44216 1 month ago	0-0 0 seconds
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 t-analysis 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	37-44053 1 month ago	unknown	unknown
24527	matthewjasper author:matthewjasper	feat(Topology/Algebra/Module): Add more theorems for IsModuleTopology	Add theorems that surjective linear maps to the module topology are open. Add IsModuleTopology instance for quotients. Add IsModuleTopology instance for finite dimensional T2 vector spaces over a complete normed field and use it to shorten some proofs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra t-topology label:t-algebra$	48/24	Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/ModuleTopology.lean	2	5	['erdOne', 'github-actions', 'matthewjasper']	nobody	37-13321 1 month ago	37-30391 1 month ago	38-85090 38 days
24574	JovanGerb author:JovanGerb	chore(Order/Notation): check for pp options in `delabSup`	The sup/inf delaborator shouldn't run when the user sets `pp.explicit true` or `pp.notation false`. This PR also removes my "-- TODO(Jovan): remove" edit: apparently, the fix in core wasn't fully successful. There still isn't support for adding/storing the localInstance inside `PPContext` or `MessageDataContext`. So we need that, or we need to extract the local instances anyways. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	8/12	Mathlib/Order/Notation.lean	1	1	['github-actions']	nobody	36-65896 1 month ago	37-270 1 month ago	37-320 37 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$	299/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	2	['Thmoas-Guan', 'github-actions']	nobody	36-59820 1 month ago	105-61462 3 months ago	105-61587 105 days
15213	adomani author:adomani	dev: add Mathlib.Tactic.Linter.ForallIntro	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter WIP	608/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/ForallIntro.lean,MathlibTest/ForallIntro.lean	5	4	['adomani', 'github-actions', 'grunweg']	nobody	36-34563 1 month ago	36-34570 1 month ago	0-0 0 seconds
22488	smmercuri author:smmercuri	fix: lower priority for `UniformSpace.Completion.instSMul`	Following the introduction of the `WithVal` type synonym in #22055 the following instance takes a long time to synthesise in FLT, and times out in the default heartbeats ```lean import Mathlib namespace IsDedekindDomain.HeightOneSpectrum variable (A K : Type*) [CommRing A] [Field K] [Algebra A K] [IsFractionRing A K] [IsDedekindDomain A] (v : HeightOneSpectrum A) #synth SMul (v.adicCompletionIntegers K) (v.adicCompletion K) ``` The issue is that `UniformSpace.Completion.instSMul (v.adicCompletionIntegers K) (v.adicCompletion K)` now fires during the start of instance search (because we now have `UniformSpace (WithVal (v.valuation K))` whereas previously this would be `UniformSpace K`, which was not automatic), and this takes a long time to fail (leading to ~1400 entries in the trace). The first few lines of the new trace is ```lean [Meta.synthInstance] [5.512418] ✅️ SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▼ [] [0.000118] new goal SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000537] ✅️ apply UniformSpace.Completion.instSMul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.004411] ✅️ apply @WithVal.instSMul to SMul (↥(adicCompletionIntegers K v)) (WithVal (valuation K v)) ▶ [] [0.000765] ❌️ apply @GradedMonoid.GradeZero.smul to SMul (↥(adicCompletionIntegers K v)) K ▶ [] [0.000378] ✅️ apply @Algebra.toSMul to SMul (↥(adicCompletionIntegers K v)) K ▶ ... [] 1339 more entries... ▶ ``` Lowering the priority of `UniformSpace.Completion.instSMul` fixes this particular issue, leading to a trace that matches that seen prior to the introduction of `WithVal`: ```lean [Meta.synthInstance] [0.016405] ✅️ SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▼ [] [0.000119] new goal SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000491] ❌️ apply @GradedMonoid.GradeZero.smul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000403] ✅️ apply @Algebra.toSMul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000134] ❌️ apply inst✝⁴ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000093] ❌️ apply inst✝⁵ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000077] ❌️ apply inst✝⁷ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000082] ❌️ apply inst✝⁹ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000075] ❌️ apply inst✝¹² to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000220] ❌️ apply Algebra.id to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.001015] ✅️ apply @ValuationSubring.instAlgebraSubtypeMem to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [resume] [0.000038] propagating Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) to subgoal Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) of SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [check] [0.013358] ✅️ Algebra.toSMul [] result Algebra.toSMul ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-topology awaiting-author	1/1	Mathlib/Topology/Algebra/UniformMulAction.lean	1	10	['github-actions', 'leanprover-bot', 'smmercuri', 'urkud']	nobody	36-28000 1 month ago	42-56552 1 month ago	55-70108 55 days
15161	adomani author:adomani	feat(Linter): flag `intros x y` which can be replaced by `intro x y`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter WIP	78/1	Mathlib/Tactic/Linter/Lint.lean,test/Lint.lean	2	4	['adomani', 'github-actions', 'grunweg']	nobody	35-85468 1 month ago	36-33682 1 month ago	0-0 0 seconds
24620	mattrobball author:mattrobball	chore(CategoryTheory.Basic): change `aesop_cat`'s intro transparency level to `instances` from `default`	Let's see if this helps much. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		93/88	Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Algebra/Homology/ShortComplex/Preadditive.lean,Mathlib/Algebra/Homology/Single.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/ModuleEmbedding/GabrielPopescu.lean,Mathlib/CategoryTheory/Adjunction/Comma.lean,Mathlib/CategoryTheory/Adjunction/Mates.lean,Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/CategoryTheory/Category/GaloisConnection.lean,Mathlib/CategoryTheory/CodiscreteCategory.lean,Mathlib/CategoryTheory/CommSq.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Discrete/Basic.lean,Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/FintypeCat.lean,Mathlib/CategoryTheory/Functor/EpiMono.lean,Mathlib/CategoryTheory/Functor/FullyFaithful.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/HomCongr.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/LiftingProperties/Adjunction.lean,Mathlib/CategoryTheory/Limits/ConeCategory.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/IsLimit.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Terminal.lean,Mathlib/CategoryTheory/Limits/Shapes/ZeroMorphisms.lean,Mathlib/CategoryTheory/MorphismProperty/OverAdjunction.lean,Mathlib/CategoryTheory/Preadditive/Opposite.lean,Mathlib/CategoryTheory/SingleObj.lean,Mathlib/Topology/Sheaves/Sheaf.lean	31	7	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	34-82871 1 month ago	35-1477 1 month ago	0-0 0 seconds
15649	TpmKranz author:TpmKranz	feat(Computability): introduce Generalised NFA as bridge to Regular Expression	Lays the groundwork for a proof of equivalence of NFA and RE, w.r.t. described language. Actual connection to NFA comes later, after the groundwork for the opposite direction has been laid. Second chunk of #12648 --- - [x] depends on: #15647 [Data.FinEnum.Option unchanged since then] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor awaiting-author	298/0	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib	5	6	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'trivial1711']	nobody	34-77905 1 month ago	34-77914 1 month ago	23-54870 23 days
20648	anthonyde author:anthonyde	feat: formalize regular expression -> εNFA	The file `Computability/RegularExpressionsToEpsilonNFA.lean` contains a formal definition of Thompson's method for constructing an `εNFA` from a `RegularExpression` and a proof of its correctness. --- - [x] depends on: #20644 - [x] depends on: #20645 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	5	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'qawbecrdtey']	nobody	34-77216 1 month ago	34-77851 1 month ago	75-77754 75 days
22954	eric-wieser author:eric-wieser	feat(RingTheory/Congruence/Hom): copy from GroupTheory	This was motivated in review of #22355, but I no longer recall why. Either way, this captures a definition that was inlined in a later file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	214/16	Mathlib/Algebra/RingQuot.lean,Mathlib/GroupTheory/Congruence/Hom.lean,Mathlib/RingTheory/Congruence/Defs.lean,Mathlib/RingTheory/Congruence/Hom.lean,Mathlib/RingTheory/TwoSidedIdeal/Kernel.lean	5	1	['github-actions']	nobody	34-70531 1 month ago	86-26537 2 months ago	86-26580 86 days
23220	mattrobball author:mattrobball	refactor(Module.LinearMap.Defs): make `SemilinearMapClass` extend `AddMonoidHomClass`	Currently `SemilinearMapClass` extends `AddHomClass`. As both `SemilinearMapClass.toAddHomClass` and `AddMonoidHomClass.toAddHomClass` are projections, they have the same priority. With `SemilinearMapClass` declared later, it wins causing expensive failed searches in the algebraic hierarchy before `AddMonoidHomClass.toAddHomClass` is found. The current instance `SemilinearMapClass.toAddMonoidHomClass` has lower priority so we may need to downgrade the priority of the projection also. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	6/10	Mathlib/Algebra/Module/LinearMap/Defs.lean	1	9	['eric-wieser', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	33-79351 1 month ago	33-79351 1 month ago	45-6308 45 days
24633	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): bicategory extension for `rotate_isos`	This PR registers some lemmas to the `rotate_isos` tactic so that it applies in bicategorical contexts. For instance, if `α : g ⟶ h` is an invertible 2-cells, the term `f ◁ α ` is also recognized as invertible, with inverse `f ◁ α' `, where `α'` is the expression for the inverse constructed by the tactic. Without this extension, the tactic would only construct the generic `inv (f ◁ α)` as inverse for this term. --- - [ ] depends on: #24454 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory t-meta blocked-by-other-PR	1206/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Bicategory.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Core.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,MathlibTest/CategoryTheory/RotateIsos.lean,scripts/noshake.json	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	33-44679 1 month ago	33-44679 1 month ago	0-945 15 minutes
24634	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): monoidal extension of `rotate_isos`	This PR registers some lemmas to the `rotate_isos` tactic so that it applies in monoidal contexts. For instance, if α : y ⟶ z is an invertible morphism, the term x ◁ α is also recognized as invertible, with inverse x ◁ α' , where α' is the expression for the inverse constructed by the tactic. Without this extension, the tactic would only construct the generic inv (x ◁ α) as inverse for this term. We also take care of terms of the form `f ⊗ g` --- - [ ] depends on: #24454 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory t-meta blocked-by-other-PR	1362/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Core.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Monoidal.lean,MathlibTest/CategoryTheory/RotateIsos.lean,scripts/noshake.json	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	33-44667 1 month ago	33-44667 1 month ago	0-689 11 minutes
24650	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): whiskering lemmas for `rotate_isos`	This PR extends the base set of terms recognized by the `rotate_isos` tactic to include terms of the form `whiskerLeft F f`, `isoWhiskerLeft F e`, and `NatTrans.hcomp`/ `NatIso.hcomp`. --- - [ ] depends on: #24454 Technically, it could depend solely on #24506, but there’s not much point getting this merged if the base tactic is not there. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta blocked-by-other-PR	1365/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Core.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,MathlibTest/CategoryTheory/RotateIsos.lean,scripts/noshake.json	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	33-43388 1 month ago	33-43391 1 month ago	0-1022 17 minutes
24361	Hagb author:Hagb	feat(Data/Finsupp/MonomialOrder): `0 ≤ a` where `a : m.syn`	`simp` would be able to solve it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor easy	3/0	Mathlib/Data/Finsupp/MonomialOrder.lean	1	1	['github-actions']	nobody	33-42488 1 month ago	33-42488 1 month ago	45-44165 45 days
24665	Komyyy author:Komyyy	feat(Mathlib/Topology/Metrizable/Uniformity): every uniform space is generated by a family of pseudometrics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology WIP	54/0	Mathlib/Topology/Metrizable/Uniformity.lean	1	1	['github-actions']	nobody	33-1725 1 month ago	33-1725 1 month ago	0-1 1 second
24667	peabrainiac author:peabrainiac	feat(CategoryTheory/Adjunction): lemmas on adjoint quadruples	Lemmas about adjoint quadruples `L ⊣ F ⊣ G ⊣ R` where some of the functors are fully faithful: * If `F` and `R` are fully faithful, the components of the induced natural transformation `G ⟶ L` are epic iff the components of the natural transformation `F ⟶ R` are monic. * If `L` and `G` are fully faithful, the components of the induced natural transformation `L ⟶ G` are epic iff the components of the natural transformation `R ⟶ F` are monic. A variant of the first case appears as proposition 2.7 on the nlab [here](https://ncatlab.org/nlab/show/cohesive+topos); the second case is dual. From [lean-orbifolds](https://github.com/peabrainiac/lean-orbifolds/blob/d599ff5f39aa831e8fa79b2f2fa7178b36bcbafd/Orbifolds/ForMathlib/Quadruple.lean). --- - [ ] depends on: #24321 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	461/3	Mathlib.lean,Mathlib/CategoryTheory/Adjunction/Quadruple.lean,Mathlib/CategoryTheory/Adjunction/Triple.lean,Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/CategoryTheory/EpiMono.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	32-78898 1 month ago	32-79449 1 month ago	0-235 3 minutes
24668	robertmaxton42 author:robertmaxton42	feat(LinearAlgebra): add inductive principle for the free product of algebras	* Add `FreeProduct.inductionOn` and `.asPowers.inductionOn`. - [ ] depends on: #24532 --- * `simp↓` on `empty_rel'_bot`: the LHS is indeed not in simp-normal form, but `simp` can't solve the full lemma (if only because `Function.onFun` isn't marked `@[simp]`) and the actual simp-normal form of `rel'` isn't terribly useful for humans. Since I do expect users to type `rel' R A` by hand, I claim this use of `simp↓` is justified. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	205/9	Mathlib/LinearAlgebra/FreeProduct/Basic.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	32-76559 1 month ago	32-77452 1 month ago	0-333 5 minutes
16150	urkud author:urkud	feat(Dynamics): Hopf decomposition	Prove Hopf decomposition. - [ ] rewrite to work with the saturations right away, not with a wandering set. - [ ] generalize to an action of a countable group, use fundamental domains. --- - [ ] depends on: #16146 - [ ] depends on: #16126 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics t-measure-probability	212/0	Mathlib.lean,Mathlib/Dynamics/Ergodic/Dissipative.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	32-57141 1 month ago	269-48791 8 months ago	0-0 0 seconds
22464	adomani author:adomani	feat(CI): declarations diff in Lean	Rewrites the `declaration_diff` script in Lean. You can see the effect of the new script in the testing branch #22497. The new CI step runs in approximately 5mins, but is separate from the `build` step. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	151/0	.github/workflows/PR_summary_lean.yml,scripts/README.md,scripts/declarations_diff.lean,scripts/declarations_diff_lean_shell_glue.sh	4	6	['bryangingechen', 'github-actions', 'grunweg']	robertylewis assignee:robertylewis	32-46758 1 month ago	97-11003 3 months ago	97-10992 97 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	2	['github-actions', 'grunweg']	mariainesdff assignee:mariainesdff	32-46491 1 month ago	52-14174 1 month ago	52-14228 52 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']	ericrbg assignee:ericrbg	32-26308 1 month ago	91-16059 2 months ago	91-16110 91 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	21	['ADedecker', 'AntoineChambert-Loir', 'erdOne', 'github-actions', 'grunweg']	ADedecker and AntoineChambert-Loir assignee:AntoineChambert-Loir assignee:ADedecker	32-26230 1 month ago	52-85074 1 month ago	63-47491 63 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']	TwoFX assignee:TwoFX	32-26214 1 month ago	56-36648 1 month ago	56-36630 56 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	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']	urkud assignee:urkud	32-19721 1 month ago	47-9884 1 month ago	48-19934 48 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	31-81043 1 month ago	270-43908 8 months ago	0-0 0 seconds
23213	mattrobball author:mattrobball	chore(RingTheory.Derivation): add a `LinearMapClass` instance	Often we want `simp` to call `map_zero` or `map_add` for a `Derivation`. To find the `ZeroHomClass` or `AddHomClass` instance necessary it starts to climb up the type class hierarchy including looking for a `LinearMapClass` instance which didn't exist. Consequently, sythesis would look in a lot of crazy places trying to summon ring structures on the module or on derivations itself. Here we add the missing `LinearMapClass` instance so that `simp` is more efficient. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	5/3	Mathlib/RingTheory/Derivation/Basic.lean	1	8	['github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	31-78563 1 month ago	31-78563 1 month ago	47-39026 47 days
23214	mattrobball author:mattrobball	perf(Module.LinearMap.Defs): deprioritize projections to parents for `SemilinearMapClass`	Trying to figure out if a given type has a `SemilinearMapClass` instance when all we want is an `AddHomClass` or a `MulActionSemiHomClass` can be quite expensive since there are multiple ways to crawl the algebraic hierarchy to generate `LinearMapClass` instances. If these fail, then they fail slowly. We deprioritize the projections from `SemilinearMapClass` to `AddHomClass` and `MulActionSemiHomClass` to make this one of the last choices. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	6/0	Mathlib/Algebra/Module/LinearMap/Defs.lean	1	6	['github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	31-78329 1 month ago	31-78329 1 month ago	47-32152 47 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	6	['eric-wieser', 'github-actions', 'plp127']	ericrbg assignee:ericrbg	31-75873 1 month ago	66-2110 2 months ago	66-2161 66 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']	adamtopaz assignee:adamtopaz	31-75742 1 month ago	59-70313 1 month ago	59-70362 59 days
24155	eric-wieser author:eric-wieser	feat: add a "rw_proc" for fin vectors	This seems a little nicer than an elaborator, since it means I can use the default elaboration rules to handle my first few variables. Ideally there would be something like ```lean rw_procQ {A : Type u} {B : A -> Type v} (a : A) (b : B a) : b = ?rhs => do /-- Context: u v : Level A : Q(Type u) B : Q($A -> Type v) a : Q($A) b : Q($B $a) rhs : Q($B $a) -- metavariable to assign \|- MetaM Q($b = ?rhs) -/ ``` or ```lean rw_proc {A : Type u} {B : A -> Type v} (a : A) (b : B a) : b = ?rhs => do /-- Context: u v : Level A B a b : Expr rhs : MVarId \|- MetaM Expr -/ ``` which would generate the code I wrote here --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data RFC t-meta awaiting-author	27/2	Mathlib/Data/Fin/Tuple/Reflection.lean	1	2	['github-actions', 'urkud']	nobody	31-75706 1 month ago	31-75706 1 month ago	20-83091 20 days
24637	michaellee94 author:michaellee94	feat(Analysis/ODE/MaximalSolution): Existence of maximal solutions for ODE meeting Picard-Lindelöf conditions	Add existence proof for maximal solution of ODE using Picard-Lindelöf and a uniqueness theorem using Grönwall's lemma. --- - [ ] depends on: #20704 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis blocked-by-other-PR	746/1	Mathlib.lean,Mathlib/Analysis/ODE/MaximalSolution.lean,docs/undergrad.yaml	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'michaellee94']	nobody	31-70108 1 month ago	32-6233 1 month ago	2-10512 2 days
22314	shetzl author:shetzl	feat: add leftmost derivations for context-free grammars	Leftmost derivations are often easier to reason about than arbitrary derivations. This PR adds leftmost variants of Rewrites, Produces and Derives to the existing definition of context-free grammars and proves that a string of terminals can be derived iff it can be leftmost derived. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	383/0	Mathlib.lean,Mathlib/Computability/LeftmostDerivation.lean	2	54	['YaelDillies', 'github-actions', 'madvorak', 'shetzl']	YaelDillies assignee:YaelDillies	31-36180 1 month ago	31-36180 1 month ago	72-3718 72 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	816/2	Mathlib.lean,Mathlib/Algebra/Lie/Derivation/AdjointAction.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LieAlgebra/Basic.lean,Mathlib/Tactic/LieAlgebra/LieRingNF.lean,Mathlib/Util/AtomM.lean,MathlibTest/lie_ring.lean,scripts/noshake.json	8	16	['bryangingechen', 'eric-wieser', 'faenuccio', 'github-actions', 'grunweg', 'ocfnash', 'siddhartha-gadgil', 'xyzw12345']	robertylewis assignee:robertylewis	31-30093 1 month ago	106-61592 3 months ago	106-61583 106 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']	Ruben-VandeVelde assignee:Ruben-VandeVelde	31-28220 1 month ago	56-29490 1 month ago	56-29544 56 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']	kmill assignee:kmill	31-28133 1 month ago	78-2807 2 months ago	126-22495 126 days
24710	chrisflav author:chrisflav	chore(Data/Set): `tsum` version of `Set.encard_iUnion_of_finite` for non-finite types	As requested here: https://github.com/leanprover-community/mathlib4/pull/23849#discussion_r2081070200 --- - [ ] depends on: #23849 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data blocked-by-other-PR	163/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Set/Card/Arithmetic.lean,Mathlib/Data/Set/Card/InfiniteArithmetic.lean,Mathlib/Data/Set/Finite/Lattice.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean,Mathlib/Topology/Instances/ENat/Lemmas.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	31-27778 1 month ago	31-27779 1 month ago	0-95 1 minute
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	277/80	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	9	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'sgouezel', 'urkud']	loefflerd assignee:loefflerd	31-23140 1 month ago	69-4593 2 months ago	107-57540 107 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	43	['Paul-Lez', 'Whysoserioushah', 'eric-wieser', 'github-actions', 'kbuzzard']	eric-wieser assignee:eric-wieser	31-21018 1 month ago	75-73462 2 months ago	75-73506 75 days
21276	GabinKolly author:GabinKolly	feat(ModelTheory/Substructures): define equivalences between equal substructures	Define first-order equivalences between equal substructures, and prove related properties. --- This is some preparatory work for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic awaiting-author	62/0	Mathlib/ModelTheory/Substructures.lean	1	19	['GabinKolly', 'YaelDillies', 'fpvandoorn', 'github-actions', 'grunweg']	nobody	31-11500 1 month ago	31-11500 1 month ago	46-55730 46 days
24727	dagurtomas author:dagurtomas	feat(CategoryTheory): the universal property of localized monoidal categories	This PR provides a monoidal structure on any functor out of a localized monoidal category whose precomposition with the localization functor is monoidal --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory WIP	457/0	Mathlib.lean,Mathlib/CategoryTheory/Localization/Bifunctor.lean,Mathlib/CategoryTheory/Localization/MonoidalFunctor.lean	3	1	['github-actions']	nobody	31-1865 1 month ago	31-1865 1 month ago	0-2 2 seconds
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$	100/0	Mathlib.lean,Mathlib/Algebra/Clone/Defs.lean	2	22	['Timeroot', 'YaelDillies', 'dupuisf', 'eric-wieser', 'github-actions', 'urkud']	YaelDillies assignee:YaelDillies	30-81075 30 days ago	63-17358 2 months ago	65-66460 65 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 delegated	8/4	Mathlib/Dynamics/Flow.lean,Mathlib/Topology/Algebra/Monoid.lean	2	10	['github-actions', 'grunweg', 'j-loreaux', 'mathlib-bors']	nobody	30-80778 30 days ago	30-80778 30 days ago	34-32727 34 days
24686	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Preserves/Bifunctor): construction of `PreservesColimit₂` instances	Given a bifunctor `G : C₁ ⥤ C₂ ⥤ C` and two diagrams `K₁ : J₁ ⥤ C₁` and `K₂ : J₂ ⥤ C₂`, we show that if `C` has limits of shape `J₁`, `G` preserves the colimit of `K₁`, and `G` objectwise preserves colimits of `K₂`, then there is a `PreservesColimit₂ K₁ K₂ G` instance. We also show that if there is a `PreservesColimit₂ K₁ K₂ G` instance, then there is a `PreservesColimit₂ K₂ K₁ G.flip` instance as well. All results are dualised for limits. --- - [ ] depends on: #24685 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	347/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Preserves/Bifunctor.lean	2	3	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	30-80540 30 days ago	32-14612 1 month ago	0-498 8 minutes
24385	mans0954 author:mans0954	WIP: feature(Analysis/LocallyConvex/Prime): The prime map	WiP: The "prime map" used in an investigation of the facial structure of closed unit balls in various Banach spaces in the work of Edwards and Rüttimann. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP	125/0	Mathlib.lean,Mathlib/Analysis/LocallyConvex/Prime.lean	2	1	['github-actions']	nobody	30-39667 30 days ago	44-34845 1 month ago	0-9 9 seconds
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 WIP	11/0	Mathlib/Analysis/SpecialFunctions/Complex/CircleMap.lean	1	10	['fbarroero', 'github-actions', 'j-loreaux', 'mans0954', 'urkud']	nobody	30-39578 30 days ago	43-33499 1 month ago	13-80660 13 days
24711	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/Limits): miscellany about preservation of (co)limits by tensor products	Register some instances regarding preservations of (co)limits for the tensor product of a monoidal category. More precisely, we register the fact that if the category is braided and `tensorLeft c` preserves colimits (this can be inferred e.g via `MonoidalClosed C`), then so does `tensorRight c` for every `c`. We also rephrase preservation of (co)limits for `curriedTensor C` in terms of preservations of (co)limits for `tensorRight c`. The PR introduces also introduces a directory `CategoryTheory.Monoidal.Limits` and moves the existing file `CategoryTheory.Monoidal.Limits.lean` to `CategoryTheory.Monoidal.Limits.Basic`. --- The instances registered here are tailored so that for a braided monoidal closed category, `PreservesColimit₂` instances from #24685 can be inferred with the results of #24686 for the external product of diagrams defined in #24703 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-category-theory	72/2	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Internal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Limits/Basic.lean,Mathlib/CategoryTheory/Monoidal/Limits/Preserves.lean	4	8	['github-actions', 'joelriou', 'robin-carlier']	nobody	30-34702 30 days ago	30-34702 30 days ago	31-17992 31 days
20051	Timeroot author:Timeroot	feat: `Clone` and some instances	Defines clones (`Clone`). And there is a file, `Instances.lean`, that gives several most important examples of Clones. In particular, it has all of the clones (in an appropriately general form) that occur in [Post's Lattice](https://en.wikipedia.org/wiki/Post%27s_lattice), and [later proving](https://github.com/leanprover-community/mathlib4/pull/24744) the completeness of Post's Lattice is why I'm making this PR. (Edit: Used to also say "Defined operads (`Operad`), symmetric operads (`SymmOperad`), and clones ... There is a proof that all clones have a natural operad structure.". This has been scrapped.) --- - [x] depends on: #20133 [basics and notations] - [x] depends on: #20134 [permutations] - [x] depends on: #20138 [operad] - [x] depends on: #20141 [clone] - [ ] 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	30-20246 30 days ago	71-1973 2 months ago	43-16103 43 days
24351	eric-wieser author:eric-wieser	feat: fderiv lemmas for `pow`	This generalizes the lemmas about `fderiv fun x => f x ^ n` to work over arbitrary normed modules and algebras. Following the convention set by the lemmas about `fderiv` and `*`, we use `'`d names for the non-commutative variants. Moves: - `deriv_pow''` -> `deriv_pow` - `deriv_pow` -> `deriv_pow_field` - `derivWithin_pow'` -> `derivWithin_pow_field'` Deletions: - `deriv_pow'` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	282/82	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Polynomial.lean,Mathlib/Analysis/Calculus/Deriv/Pow.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Pow.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Complex/Angle.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/NumberTheory/ModularForms/JacobiTheta/TwoVariable.lean	9	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	29-68522 29 days ago	29-68522 29 days ago	30-15569 30 days
22966	alreadydone author:alreadydone	feat(RingTheory): degree 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 label:t-algebra$	272/49	Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Algebraic/Basic.lean,Mathlib/RingTheory/Algebraic/Integral.lean,Mathlib/RingTheory/AlgebraicIndependent/AlgebraicClosure.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	6	11	['Louddy', 'alreadydone', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	29-64005 29 days ago	29-64974 29 days ago	47-35835 47 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/)	file-removed t-algebra awaiting-CI label:t-algebra$	328/326	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	9	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'urkud']	nobody	29-46999 29 days ago	29-46999 29 days ago	23-61670 23 days
24532	robertmaxton42 author:robertmaxton42	feat(LinearAlgebra/FreeProduct): fill out the `FreeProduct.asPowers` namespace	* Replicate the existing API for `LinearAlgebra.FreeProduct` under `FreeProduct.asPowers`, for convenience when working primarily with the power algebra representation * Adds convenience lemmas for using the corresponding quotient relation `rel'` (used in the above). --- - [x] depends on: #24531 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	122/5	Mathlib/LinearAlgebra/FreeProduct/Basic.lean	1	25	['YaelDillies', 'adomani', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robertmaxton42']	nobody	29-41860 29 days ago	29-41912 29 days ago	30-3816 30 days
24008	meithecatte author:meithecatte	chore(EpsilonNFA): replace manual lemmas with @[simps]	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	2/24	Mathlib/Computability/EpsilonNFA.lean	1	2	['YaelDillies', 'github-actions', 'urkud']	nobody	29-37044 29 days ago	29-37044 29 days ago	27-52316 27 days
24571	Multramate author:Multramate	refactor(AlgebraicGeometry/EllipticCurve/Affine/*): some minor changes	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry WIP	0/12	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean	2	n/a	['github-actions', 'leanprover-community-bot-assistant']	nobody	29-16827 29 days ago	unknown	unknown
24602	xyzw12345 author:xyzw12345	feat(LinearAlgebra/SymmetricAlgebra): IsSymmetricAlgebra	This PR is a part of #21539, which separates out the part about `IsSymmetricAlgebra`. Co-authored-by: Raphael Douglas Giles @Raph-DG Co-authored-by: Zhixuan Dai <22300180006@m.fudan.edu.cn> Co-authored-by: Zhenyan Fu Co-authored-by: Yiming Fu - [ ] depends on: #21539 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	78/0	Mathlib/LinearAlgebra/SymmetricAlgebra/Basic.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basis.lean	2	5	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	29-11986 29 days ago	29-12238 29 days ago	29-14179 29 days
23238	YaelDillies author:YaelDillies	feat: extended floor and ceil	My motivation for this is to prove `ENat.toENNReal (⨆ i, f i) = ⨆ i, ENat.toENNReal (f i)` and `ENat.toENNReal (⨅ i, f i) = ⨅ i, ENat.toENNReal (f i)`. Kalle Kytölä independently needs this for his formalisation of statistical physics. From MiscYD --- - [x] depends on: #24781 - [x] depends on: #24782 See #15269 for a past attempt. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	235/0	Mathlib.lean,Mathlib/Algebra/Order/Floor/Extended.lean	2	24	['YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'kkytola', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	29-1394 29 days ago	29-7345 29 days ago	76-59566 76 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	15	['callesonne', 'chrisflav', 'github-actions']	nobody	28-82913 28 days ago	68-14237 2 months ago	8-4256 8 days
22662	plp127 author:plp127	feat: Localization.Away.lift (computably)	This PR adds `Localization.Away.lift'` and `Localization.Away.lift`, computable alternatives to `Localization.awayLift`. --- - [x] depends on: #24791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	74/0	Mathlib/RingTheory/Localization/Away/Basic.lean	1	11	['eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'plp127', 'vihdzp']	nobody	28-72193 28 days ago	28-73125 28 days ago	94-73110 94 days
24184	YaelDillies author:YaelDillies	feat: `[G : H]` notation for the index of `H : Subgroup G`	This is a cute notation which I wrote for FLT. Not sure whether we want it in mathlib nor how to include `relindex` in the picture. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC label:t-algebra$	5/0	Mathlib/GroupTheory/Index.lean	1	7	['YaelDillies', 'erdOne', 'github-actions', 'j-loreaux', 'kbuzzard']	nobody	28-57787 28 days ago	28-57787 28 days ago	51-81907 51 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$	83/0	Mathlib/Algebra/DirectSum/Decomposition.lean	1	9	['eric-wieser', 'github-actions', 'pelicanhere']	eric-wieser assignee:eric-wieser	28-41099 28 days ago	86-37917 2 months ago	86-37959 86 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	137/11	Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,scripts/noshake.json	5	7	['github-actions', 'j-loreaux', 'vasnesterov']	nobody	28-7043 28 days ago	30-14317 30 days ago	95-9992 95 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	14	['github-actions', 'grunweg', 'hrmacbeth', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'sgouezel']	grunweg assignee:grunweg	27-82562 27 days ago	81-30618 2 months ago	82-15074 82 days
24372	Hagb author:Hagb	feat(Tactic/SimpIntro): add support for introducing non-propositions	`simp_intro` would be able to introduce non-propositions. The previous `simp_intro` tactic cannot solve some statement that can be solved by applying `intro` and `simp` like `simp_intro`. For example, the following one can be solved like this ```lean example (r : Nat → Prop) : (∀ x, x > 0 → r x) → ∀ y z, y = 0 → z > y → r z := by simp intro hr try simp at hr -- does nothing try simp [hr] -- does nothing intro y z try simp [hr] -- does nothing intro hy try simp [hr] at hy -- does nothing simp [hr, hy] intro hyz try simp [hr, hy] at hyz simp [hr, hy, hyz] -- accomplish the goal successfully ``` while the previous `simp_intro` cannot introduce `y` and `z` here. ```lean example (r : Nat → Prop) : (∀ x, x > 0 → r x) → ∀ y z, y = 0 → z > y → r z := by /- the previous `simp_intro` fails with message: invalid 'simp', proposition expected Nat -/ simp_intro .. -- or `simp_intro hr y` example (r : Nat → Prop) : (∀ x, x > 0 → r x) → ∀ y z, y = 0 → z > y → r z := by -- unsolved simp_intro hr example (r : Nat → Prop) : (∀ x, x > 0 → r x) → ∀ y z, y = 0 → z > y → r z := by -- successfully solve the goal with the `simp_intro` in thie commit simp_intro .. -- or `simp_intro hr y z hy hz` ``` This commit makes it be able to introduce these kinds of hypotheses. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta	13/2	Mathlib/Tactic/SimpIntro.lean,MathlibTest/simp_intro.lean	2	1	['github-actions']	kmill assignee:kmill	27-81860 27 days ago	45-5392 1 month ago	45-5443 45 days
24395	rudynicolop author:rudynicolop	feat(Data/List): list splitting definitions and lemmas	Adds definitions and lemmas for obtaining all prefixes and suffixes of lists. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	143/2	Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/List/TakeDrop.lean	2	1	['github-actions']	ericrbg assignee:ericrbg	27-81842 27 days ago	44-2869 1 month ago	44-2931 44 days
23497	chrisflav author:chrisflav	chore(RingTheory/AdicCompletion/AsTensorProduct): golf using five lemma for modules	--- - [x] depends on: #23496 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	30/81	Mathlib/RingTheory/AdicCompletion/AsTensorProduct.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	27-75525 27 days ago	48-33482 1 month ago	48-34307 48 days
24829	urkud author:urkud	fix(Topology/Homotopy): fix name&args order of `comp`	`ContinuousMap.Homotopy.hcomp` used name & arguments order that matches Mathlib's category theory conventions, not topology conventions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	30/19	Mathlib/Topology/Homotopy/Basic.lean,Mathlib/Topology/Homotopy/Contractible.lean,Mathlib/Topology/Homotopy/Equiv.lean,Mathlib/Topology/Homotopy/Lifting.lean	4	5	['github-actions', 'grunweg', 'urkud']	nobody	27-47902 27 days ago	27-56542 27 days ago	27-56596 27 days
24744	Timeroot author:Timeroot	Post's lattice	Draft PR for now so I can get CI checks. Eventually want to prove Post's Lattice --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	758/0	Mathlib.lean,Mathlib/Algebra/Clone/Basic.lean,Mathlib/Algebra/Clone/Defs.lean,Mathlib/Algebra/Clone/Instances.lean,Mathlib/Algebra/Clone/PostLattice.lean,Mathlib/Data/Fin/Basic.lean	6	1	['github-actions']	nobody	27-43513 27 days ago	27-43513 27 days ago	0-0 0 seconds
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. --- See [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Generalizing.20.60PartialHomeomorph.60.3F) that will probably mean that I close this PR. 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/)	awaiting-zulip t-topology	53/0	Mathlib.lean,Mathlib/Topology/PartialEquiv.lean	2	3	['ADedecker', 'github-actions', 'scholzhannah']	ADedecker assignee:ADedecker	27-15400 27 days ago	31-22176 1 month ago	51-86236 51 days
24793	tristan-f-r author:tristan-f-r	feat: trace of unitarily similar matrices	adds a theorem relating trace to unitarily similar matrices used in the easy direction of specht's theorem --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	7/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	3	['github-actions', 'j-loreaux', 'tristan-f-r']	nobody	27-14922 27 days ago	27-18456 27 days ago	1-55872 1 day
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 awaiting-CI	51/15	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/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean	6	43	['Vierkantor', 'YaelDillies', 'faenuccio', 'github-actions']	nobody	27-10544 27 days ago	27-10545 27 days ago	5-22106 5 days
24752	MichaelStollBayreuth author:MichaelStollBayreuth	perf(Data.Real.Sqrt): make Real.sqrt irreducible	We try to see what happens if we make `Real.sqrt` irreducible. There are cases where this makes unification very significantly faster, compare [#mathlib4 > Coercion triggers timeout @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Coercion.20triggers.20timeout/near/517177117). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	1/0	Mathlib/Data/Real/Sqrt.lean	1	18	['MichaelStollBayreuth', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	27-3829 27 days ago	29-17151 29 days ago	29-22628 29 days
24870	smmercuri author:smmercuri	feat: `Field`, `FiniteDimensional` and `Algebra.IsSeparable` instances for `WithAbs`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis	14/1	Mathlib/Analysis/Normed/Field/WithAbs.lean	1	1	['github-actions']	nobody	26-49284 26 days ago	26-49291 26 days ago	26-49435 26 days
24872	smmercuri author:smmercuri	feat: `apply` and `coe` results for `UniformSpace.Completion.mapRingHom`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	9/0	Mathlib/Topology/Algebra/UniformRing.lean	1	1	['github-actions']	nobody	26-49063 26 days ago	26-49063 26 days ago	26-49111 26 days
24873	smmercuri author:smmercuri	feat: `Subtype.map_ne`	The restrictions to subtypes of two functions that never agree, also never agree. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	7/0	Mathlib/Data/Subtype.lean	1	1	['github-actions']	nobody	26-48723 26 days ago	26-48725 26 days ago	26-48774 26 days
24883	madvorak author:madvorak	chore(Data/Matrix): `Matrix.submatrix` naming convention	I'm suggesting this change for the following reasons: (1) managing expectations — `r_reindex` looks more like a propositional argument at first glance (2) the original naming does not do justice to its motivation — there is nothing called `r` and `c` here — it would need to be `row_reindex` and `col_reindex` or something like that (if we wanted to use the convention for naming constants even tho we are naming a variable here) --- Old version: https://github.com/leanprover-community/mathlib4/pull/24135	t-data	11/11	Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Defs.lean	2	1	['github-actions']	nobody	26-45358 26 days ago	26-45358 26 days ago	26-45348 26 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	7	['Louddy', 'Ruben-VandeVelde', 'alreadydone', 'github-actions', 'grunweg']	kbuzzard assignee:kbuzzard	26-44624 26 days ago	26-44624 26 days ago	53-45384 53 days
24892	Ruben-VandeVelde author:Ruben-VandeVelde	fix: add missing simps projections for ContinuousAddEquiv	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	1/0	Mathlib/Topology/Algebra/ContinuousMonoidHom.lean	1	1	['github-actions']	nobody	26-36685 26 days ago	26-36687 26 days ago	26-36736 26 days
23999	YaelDillies author:YaelDillies	feat: toric ideals	From Toric Co-authored-by: Patrick Luo --- - [x] depends on: #22635 - [x] depends on: #24738 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebraic-geometry WIP	83/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Toric/Ideal.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	26-34559 26 days ago	26-35116 26 days ago	2-15562 2 days
24889	Kha author:Kha	chore: do not include cache requests in build benchmark			5/2	scripts/bench/temci-config.run.yml	1	4	['Kha', 'github-actions', 'leanprover-bot']	nobody	26-29277 26 days ago	26-39112 26 days ago	26-39095 26 days
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/)	t-algebra t-analysis t-number-theory label:t-algebra$	543/2	Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Analysis/AbsoluteValue/Equivalence.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean	5	1	['github-actions']	nobody	26-25905 26 days ago	26-43208 26 days ago	37-66790 37 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	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	26-25753 26 days ago	52-85168 1 month ago	0-616 10 minutes
24618	b-mehta author:b-mehta	feat(Analysis): add Schur inequality and variants	Add Schur inequality and some of its common variants. TODO: - [x] add reference to source: https://www.cip.ifi.lmu.de/~grinberg/VornicuS.pdf - [ ] add other generalisations - [ ] move some of the lemmas elsewhere --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP	145/0	Mathlib/Analysis/Convex/Schur.lean	1	16	['b-mehta', 'eric-wieser', 'github-actions']	nobody	26-24577 26 days ago	35-4515 1 month ago	0-2 2 seconds
24311	YaelDillies author:YaelDillies	chore: replace `Monoid.IsTorsionFree` with `IsMulTorsionFree`	From Toric --- - [x] depends on: #24312 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	63/29	Mathlib/Algebra/Group/Torsion.lean,Mathlib/Combinatorics/Additive/CauchyDavenport.lean,Mathlib/GroupTheory/Order/Min.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/Topology/Instances/ZMultiples.lean	5	5	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	26-24432 26 days ago	26-24432 26 days ago	26-37762 26 days
22043	YaelDillies author:YaelDillies	chore: shortcut instance for `Neg ℤˣ`	This lets us avoid importing `Ring` in downstream files (most of the effect is to come). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-algebra label:t-algebra$	20/47	Mathlib.lean,Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/Group/Int/Units.lean,Mathlib/Algebra/Order/Ring/Abs.lean,Mathlib/Algebra/Ring/Int/Units.lean,Mathlib/Algebra/Ring/NegOnePow.lean,Mathlib/Data/Fintype/Units.lean,Mathlib/Data/Int/AbsoluteValue.lean,Mathlib/Data/Int/Associated.lean,Mathlib/GroupTheory/HNNExtension.lean,Mathlib/NumberTheory/NumberField/Basic.lean,MathlibTest/Zify.lean	12	15	['YaelDillies', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors']	nobody	26-24175 26 days ago	26-24175 26 days ago	110-83611 110 days
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 awaiting-author	61/0	Mathlib.lean,Mathlib/Topology/UniformSpace/Separated.lean	2	18	['ADedecker', 'D-Thomine', 'YaelDillies', 'b-mehta', 'github-actions']	ADedecker assignee:ADedecker	26-23406 26 days ago	26-23406 26 days ago	30-63355 30 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/)	awaiting-author documentation	52/14	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	10	['ADedecker', 'BoltonBailey', 'eric-wieser', 'github-actions', 'jcommelin', 'mattrobball']	nobody	25-49669 25 days ago	25-49669 25 days ago	33-13460 33 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 awaiting-author	220/9	Mathlib.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Defs.lean,Mathlib/MeasureTheory/Function/LpSeminorm/NNLpNorm.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean	4	18	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'sgouezel']	nobody	25-47917 25 days ago	26-36894 26 days ago	13-15316 13 days
24254	Louddy author:Louddy	feat: valuation on RatFunc which is trivial on constants	Given a valuation `v` on `RatFunc K` that is trivial on the constants `K`, the valuation on `RatFunc.X` determines to some degree the valuation on any `p : Polynomial K`. These are important in the context of Ostrowski's theorem for `RatFunc K`. Note that the condition that the valuation is trivial on constants is automatically fulfilled when `K` is finite. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	66/0	Mathlib/FieldTheory/RatFunc/AsPolynomial.lean	1	29	['Louddy', 'faenuccio', 'github-actions', 'mariainesdff']	nobody	25-33991 25 days ago	25-34043 25 days ago	27-34964 27 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	34/0	Mathlib/Data/Set/Lattice.lean,Mathlib/Data/Set/Pairwise/Lattice.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean	3	12	['github-actions', 'grunweg', 'j-loreaux', 'oeb25']	nobody	25-33393 25 days ago	25-34406 25 days ago	127-82912 127 days
24912	YaelDillies author:YaelDillies	feat: affine monoids	Define affine monoids as finitely generated cancellative torsion-free commutative monoids and prove a few of their basic properties: * An affine monoid with no non-trivial unit is generated by its irreducible elements * An affine monoid embeds into `ℤⁿ` for some `n` * Let `M` be an affine monoid. If `R` is a domain, then so is `R[M]`. From Toric Co-authored-by: Patrick Luo --- - [ ] depends on: #24913 - [x] depends on: #24914 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra blocked-by-other-PR label:t-algebra$	199/3	Mathlib.lean,Mathlib/Algebra/AffineMonoid/Basic.lean,Mathlib/Algebra/AffineMonoid/Embedding.lean,Mathlib/Algebra/AffineMonoid/Irreducible.lean,Mathlib/Algebra/AffineMonoid/UniqueSums.lean,Mathlib/Algebra/Group/Irreducible/Defs.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	25-22168 25 days ago	26-3587 26 days ago	0-479 7 minutes
24705	grunweg author:grunweg	feat(workflows): automatically assign reviewers	Once per day, automatically assign all proposed reviewers from the automatic assignment algorithm. --- See [the github documentation](https://docs.github.com/en/rest/issues/assignees?apiVersion=2022-11-28#add-assignees-to-an-issue) for the assignment syntax. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI help-wanted	42/0	.github/workflows/auto_assign_reviewers.yaml	1	13	['adomani', 'bryangingechen', 'github-actions', 'grunweg']	bryangingechen assignee:bryangingechen	25-17482 25 days ago	25-84554 25 days ago	2-20480 2 days
24730	YaelDillies author:YaelDillies	feat(Bialgebra): group-like elements	Define group-like elements in a bialgebra, ie units `a` such that `Δ a = a ⊗ₜ a`. We prove that group-like elements always form a group, and are linearly independent if the base ring is a domain. From Toric Co-authored-by: Michał Mrugała --- - [x] depends on: #24747 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	167/0	Mathlib.lean,Mathlib/RingTheory/Bialgebra/GroupLike.lean	2	18	['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	25-15390 25 days ago	29-79464 29 days ago	29-81020 29 days
24891	YaelDillies author:YaelDillies	feat: `M ≃ₗ[R] (Fin (Module.finrank R M) → R)` for `M` a finite `R`-module	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	13/3	Mathlib/LinearAlgebra/Dimension/Free.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean,Mathlib/LinearAlgebra/FreeModule/Finite/Basic.lean	3	9	['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions']	nobody	25-11279 25 days ago	26-21110 26 days ago	26-38032 26 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$	453/45	Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean	1	57	['AntoineChambert-Loir', 'Louddy', 'github-actions', 'kbuzzard']	nobody	24-42459 24 days ago	26-39366 26 days ago	98-59896 98 days
24948	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): define `between` subgraphs	The simple graph `G.between s t` is the subgraph of `G` containing edges that connect a vertex in the set `s` to a vertex in the set `t`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	91/0	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean	1	1	['github-actions']	nobody	24-40626 24 days ago	24-40631 24 days ago	24-40679 24 days
24838	RemyDegenne author:RemyDegenne	feat(MeasureTheory): tightness of the range of a sequence	* `isTightMeasureSet_range_iff_tendsto_limsup_measure_norm_gt`: in a proper normed group, the range of a sequence of measures `μ : ℕ → Measure E` is tight if and only if the function `r : ℝ ↦ limsup (fun n ↦ μ n {x \| r < ‖x‖}) atTop` tends to `0` at infinity. * `isTightMeasureSet_range_iff_tendsto_limsup_inner`: in a finite-dimensional inner product space, the range of a sequence of measures `μ : ℕ → Measure E` is tight if and only if the function `r : ℝ ↦ limsup (fun n ↦ μ n {x \| r < ‖⟪y, x⟫_𝕜‖}) atTop` tends to `0` at infinity for all `y`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	197/2	Mathlib/MeasureTheory/Measure/TightNormed.lean	1	7	['RemyDegenne', 'github-actions', 'sgouezel']	nobody	24-32205 24 days ago	24-42642 24 days ago	2-82189 2 days
24957	eric-wieser author:eric-wieser	feat: use ` binderNameHint` in sum_congr	Zulip thread: [#new members > Choosing dummy variable inside summation @ 💬](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Choosing.20dummy.20variable.20inside.20summation/near/518492888) Co-authored-by: Joachim Breitner --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	23/16	Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/List/OfFn.lean,Mathlib/Data/Multiset/Count.lean,Mathlib/Data/Multiset/Filter.lean,Mathlib/Data/Multiset/MapFold.lean,Mathlib/Data/Option/Basic.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Sym/Basic.lean,Mathlib/Data/Sym/Sym2.lean	13	1	['github-actions']	nobody	24-23721 24 days ago	24-25171 24 days ago	24-25230 24 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	65/48	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/Moments/Variance.lean,Mathlib/RingTheory/PowerBasis.lean,Mathlib/Topology/MetricSpace/Holder.lean,Mathlib/Topology/MetricSpace/HolderNorm.lean	14	20	['YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	23-44302 23 days ago	23-44323 23 days ago	73-36877 73 days
24967	vasnesterov author:vasnesterov	perf(Topology/Metrizable): lower `IsCompletelyMetrizableSpace.MetrizableSpace` priority	The priority of `IsCompletelyMetrizableSpace.MetrizableSpace` was set to 100, causing it to be applied before `EMetricSpace.metrizableSpace` and leading to wasted time trying to infer completeness. This PR sets it to 90. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology easy	1/1	Mathlib/Topology/Metrizable/CompletelyMetrizable.lean	1	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	23-30787 23 days ago	23-69878 23 days ago	23-71889 23 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 `AnalyticOn.hasFPowerSeriesOnBall`: a variant of `AnalyticAt.hasFPowerSeriesAt` which gives convergence to the function on the ball of convergence. --- - [x] depends on: #23745 - [x] depends on: #23747 - [x] depends on: #23748 - [ ] depends on: #24967 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis blocked-by-other-PR	48/1	Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Topology/Metrizable/CompletelyMetrizable.lean	3	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	23-29464 23 days ago	23-32732 23 days ago	0-220 3 minutes
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	192/0	Mathlib.lean,Mathlib/CategoryTheory/Abelian/SerreClass/MorphismProperty.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean,Mathlib/CategoryTheory/Preadditive/Basic.lean	5	7	['TwoFX', 'erdOne', 'github-actions', 'joelriou']	nobody	23-22640 23 days ago	23-22640 23 days ago	81-8568 81 days
21162	smmercuri author:smmercuri	feat: add `Valued.WithZeroMulInt.tendsto_zero_pow_of_le_neg_one`	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. --- - [x] depends on: #21160 - [x] depends on: #22055 - [ ] depends on: #24977 [![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$	94/6	Mathlib.lean,Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/GroupWithZero/Int.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	7	51	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'smmercuri']	nobody	23-9796 23 days ago	23-9798 23 days ago	62-12390 62 days
5919	MithicSpirit author:MithicSpirit	feat: implement orthogonality for AffineSubspace	Define `AffineSubspace.orthogonal` and `AffineSubspace.IsOrtho`, as well as develop an API emulating that of `Submodule.orthogonal` and `Submodule.IsOrtho`, respectively. Additionally, provide some relevant lemmas exclusive to affine subspaces, which are mostly to do with the relationship between orthogonality and `AffineSubspace.Parallel`. Closes #5539 --- Still WIP as I need to add more docstrings as well as notations for the new definitions. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis WIP help-wanted	287/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/AffineSubspace.lean	2	6	['MithicSpirit', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	MithicSpirit assignee:MithicSpirit	23-7190 23 days ago	23-7208 23 days ago	0-0 0 seconds
10235	urkud author:urkud	feat: add `Decidable`, `Fintype`, `Encodable` linters	This PR ports the `decidableClassical`, `fintypeFinite` and `encodableCountable` linters from mathlib3: all three are environment linters which flag declarations that have a hypothesis `[Decidable p]` etc., but do not use the underlying assumption in this type. Restructuring the code can make the statement more general. The implementation is in fact quite general, and can easily adapt to include further types. PRs #17518 and #17519 are two examples of further such linters. --- Please don't fix the failures related to `HasFDerivWithinAt.pi`. Finiteness assumptions in these lemmas will be completely removed during porting to TVS. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench large-import t-linter t-meta awaiting-author	123/4	Mathlib.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/NumberTheory/JacobiSum/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Tactic.lean,Mathlib/Tactic/GeneralizeProofs.lean,Mathlib/Tactic/Linter/UnusedAssumptionInType.lean	11	n/a	['Command-Master', 'github-actions', 'grunweg', 'kmill', 'leanprover-bot', 'urkud']	nobody	23-5887 23 days ago	unknown	unknown
24533	robertmaxton42 author:robertmaxton42	feat (ULift): conjugation by ULift.up/down, misc cast/heq lemmas	* Adds the convenience def `ULift.conj x := `down (f (up x))`, and corresponding basic lemmas * Adds lemmas showing that `ULift.up` and `.down` commute with casts and preserve `HEq`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	31/0	Mathlib/Data/ULift.lean	1	14	['eric-wieser', 'github-actions', 'robertmaxton42']	nobody	22-38855 22 days ago	38-38495 1 month ago	38-46410 38 days
24383	YaelDillies author:YaelDillies	feat: distributive Haar characters of `ℝ` and `ℂ`	Compute `distribHaarChar` in the case of the actions of `ℝˣ` on `ℝ` and of `ℂˣ` on `ℂ`. The file I'm moving was added two days ago and is not yet used in FLT. From FLT --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-measure-probability awaiting-CI WIP	205/78	Mathlib.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Action.lean,Mathlib/Algebra/Group/Action/BigOperators.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar/Complex.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar/Real.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean	8	19	['YaelDillies', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'sgouezel']	nobody	22-36243 22 days ago	27-47643 27 days ago	8-77637 8 days
24191	joelriou author:joelriou	refactor(CategoryTheory): redefine triangulated subcategories using ObjectProperty	--- - [x] depends on: #22574 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	279/191	Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/CategoryTheory/ObjectProperty/ContainsZero.lean,Mathlib/CategoryTheory/ObjectProperty/Shift.lean,Mathlib/CategoryTheory/Triangulated/HomologicalFunctor.lean,Mathlib/CategoryTheory/Triangulated/Subcategory.lean	5	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	22-30674 22 days ago	28-3496 28 days ago	46-67686 46 days
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. --- - [x] depends on: #22203 - [ ] depends on: #21026 - [x] 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	195/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/MultiequalizerPullback.lean,Mathlib/Order/CompleteLattice/MulticoequalizerDiagram.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	22-30425 22 days ago	61-25375 2 months ago	0-16 16 seconds
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	715/362	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	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	22-30226 22 days ago	22-30247 22 days 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	391/10	Mathlib/Algebra/Category/ModuleCat/Differentials/Presheaf.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	22-28951 22 days ago	22-28970 22 days ago	0-530 8 minutes
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 WIP	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	22-28718 22 days ago	38-17536 1 month ago	59-17063 59 days
24993	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): left and right unitors for Day convolution	Given a `DayConvolutionUnit U` a functor `F : C ⥤ V` and a Day convolution of `U` and `F`, we construct the left unitor isomorphism. `U ⊛ F ≅ F`. Similarly, given a Day convolution of `F` and `U`, we construct the right unitor. We characterize the isomorphisms, show their naturality, and show that the triangle identity is satisfied. --- - [ ] depends on: #24992 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	954/0	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct/Basic.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct/KanExtension.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	22-19955 22 days ago	22-19957 22 days ago	0-173 2 minutes
24992	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): Associators and pentagon for Day Convolution	Under some assumptions on the tensor product of a monoidal category `V`, we show that if three functors `F, G, H` are such that the relevant Day convolutions exist, then there is an associator isomorphism for day convolution. We characterize this isomorphism, and show it is natural. When all relevant Day convolutions exist, we show that the pentagon identity holds for these associators. --- - [ ] depends on: #24991 - [ ] depends on: #24989 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	686/0	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct/Basic.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct/KanExtension.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	22-19954 22 days ago	22-19956 22 days ago	0-414 6 minutes
24991	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal): Day convolution of functors	Given monoidal categories `C`,`V` and functors `F G : C ⥤ V`, we introduce a typeclass `[DayConvolution F G]` that bundles the data of a functor `F ⊛ G`, as well as the data required to exhibit `F ⊛ G` as a pointwise left Kan extension of `F ⊠ G` (the external product of `F` and `G`) along the tensor product of `C`. We give basic API around this class. We also define a class `DayConvolutionUnit U` which contains the data that `U` is pointwise left Kan extended from `fromPUnit (𝟙_ V)` along `fromPUnit (𝟙_ C)`. Again, we give basic API around this class. Properties like construction of associators and unitors isomorphisms (and the pentagon/triangle identities) will be the subject of subsequent PRs. --- - [ ] depends on: #24703 I opted to make `DayConvolution` a class to make assumptions on `C` and `V` minimal. Also, I realized that `C ⥤ V` already has a monoidal structure (given by pointwise tensor product), so trying to turn it into a monoidal category through Day convolution is probably pointless. What I intend to do instead is to define a typeclass `DayConvolutionMonoidalCategory A` that will extend `MonoidalCategory A`. This class will contain the data of a fully faithful functor `A ⥤ (C ⥤ V)`, and the data required to make it a "monoidal full subcategory" of `C ⥤ V`. This should allow us to register instances on type aliases for `C ⥤ V`, of course, there should be a constructor for this class that takes as input the embedding and existence of suitable pointwise extensions, and then turn it into a `DayConvolutionMonoidalCategory`. This is upcoming work [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	309/0	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	22-19953 22 days ago	22-19954 22 days ago	0-816 13 minutes
24989	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/ExternalProduct): external product of left Kan extended functors	Given a functor `H' : D' ⥤ V` to a monoidal category that is pointwise left Kan extended along `L : D ⥤ D'`, we show that for a functor `K : E ⥤ V` and under suitable preservations of colimits by the tensor product of `V`, the functor `H' ⊠ K : D' × E ⥤ V` is pointwise left Kan extended along `L.prod (𝟭 E)`. We show a similar statement for the functor `K ⊠ H'`. This property is crucial for proving properties of Day convolutions of functors from a monoidal category to `V`. --- - [ ] depends on: #24703 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	244/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct/Basic.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct/KanExtension.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	22-19951 22 days ago	22-19953 22 days ago	0-2653 44 minutes
24960	linesthatinterlace author:linesthatinterlace	feat(Data/Finite/PermOf): Add an array-based implementation of finite permutations, `PermOf`.	Implements `PermOf`, an array-based implementation of finite permutations/ --- As part of my PhD, I created this implementation. I have more to add to it, but I'm making this relatively small initial commit to exhibit the core definitions before I start building anything elaborate. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	378/0	Mathlib.lean,Mathlib/Data/Finite/PermLT/Defs.lean,Mathlib/Data/Finite/PermLT/Group.lean,Mathlib/Data/Finite/PermLT/MulAction.lean	4	35	['eric-wieser', 'github-actions', 'linesthatinterlace']	nobody	22-7695 22 days ago	24-19913 24 days ago	24-19968 24 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`. --- - [x] depends on: #24576 - [ ] depends on: #25002 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data new-contributor blocked-by-other-PR	327/101	Mathlib.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/LCM.lean,Mathlib/Data/Nat/Factorization/Multiplicity.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/GroupTheory/Exponent.lean,Mathlib/NumberTheory/Cyclotomic/PrimitiveRoots.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean	8	40	['Kevew', 'Paul-Lez', 'YaelDillies', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	Kevew assignee:Kevew	22-2003 22 days ago	25-44365 25 days ago	85-42249 85 days
24932	jkanschik author:jkanschik	feat(Analysis/Calculus/VectorField): Implement product rule for liebrackets	This adds lemmas for the product rule (or Leibniz rule) for Lie brackets on vector fields. These new lemmas are called `lieBracket_smul_left` and similar. To accomodate this, rename the existing lemmas `{m}lieBracket{Within}_smul_{left,right}` to `{m}lieBracket{Within}_const_smul_{left,right}`. An additional PR for the same functionality on manifolds is in preparation and would depend on this PR. This will become useful when introducing Lie derivatives or covariant derivatives in differential geometry.	new-contributor t-differential-geometry awaiting-author	78/28	Mathlib/Analysis/Calculus/VectorField.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/Geometry/Manifold/VectorField/LieBracket.lean	3	30	['github-actions', 'grunweg', 'jkanschik', 'sgouezel']	nobody	22-715 22 days ago	23-30023 23 days ago	1-1522 1 day
24966	michaellee94 author:michaellee94	feat(Manifold/PartitionOfUnity): Existence of global C^n smooth section for nontrivial bundles	Add existence of global C^n smooth section for nontrivial bundles --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-differential-geometry	154/13	Mathlib/Geometry/Manifold/PartitionOfUnity.lean	1	3	['github-actions', 'grunweg', 'michaellee94']	nobody	21-79963 21 days ago	23-17943 23 days ago	23-45496 23 days
19796	peakpoint author:peakpoint	feat: L'Hopital's rule from within a convex set	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	190/19	Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Convex/Topology.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Order/Interval/Set/Basic.lean	5	14	['RemyDegenne', 'github-actions', 'leanprover-community-bot-assistant', 'peakpoint', 'sgouezel']	sgouezel assignee:sgouezel	21-79134 21 days ago	21-79134 21 days ago	55-29418 55 days
17458	urkud author:urkud	refactor(Algebra/Group): make `IsUnit` a typeclass	Also change some lemmas to assume `[IsUnit _]` instead of `[Invertible _]`. Motivated by potential non-defeq diamonds in #14986, see also [Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Invertible.20and.20data) I no longer plan to merge this PR, but I'm going to cherry-pick some changes to a new PR before closing this one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-algebra label:t-algebra$	82/72	Mathlib/Algebra/CharP/Invertible.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Units.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/GroupTheory/Submonoid/Inverses.lean,Mathlib/LinearAlgebra/AffineSpace/AffineEquiv.lean,Mathlib/LinearAlgebra/AffineSpace/Combination.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Contraction.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Inversion.lean,Mathlib/LinearAlgebra/CliffordAlgebra/SpinGroup.lean,Mathlib/LinearAlgebra/Eigenspace/Minpoly.lean,Mathlib/NumberTheory/MulChar/Basic.lean,Mathlib/RingTheory/Localization/NumDen.lean,Mathlib/RingTheory/Polynomial/Content.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/Valuation/Basic.lean	26	11	['MichaelStollBayreuth', 'acmepjz', 'eric-wieser', 'github-actions', 'leanprover-bot', 'urkud']	nobody	21-63866 21 days ago	21-84293 21 days ago	0-66650 18 hours
24435	faenuccio author:faenuccio	chore(RingTheory/Valuation/Discrete/Basic): add ordered Iso between Z_{m0} and the value group		large-import t-order t-algebra WIP label:t-algebra$	267/28	Mathlib/Algebra/GroupWithZero/Int.lean,Mathlib/Algebra/Order/Group/Cyclic.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean	3	5	['faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'mariainesdff']	nobody	21-28505 21 days ago	28-5843 28 days ago	0-3 3 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 label:t-algebra$	253/71	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Instances.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/IntegralClosure/IntegralRestrict.lean,Mathlib/RingTheory/Localization/AtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/LocalizationLocalization.lean,Mathlib/RingTheory/RingHom/Finite.lean,Mathlib/RingTheory/Trace/Quotient.lean	11	34	['YaelDillies', 'erdOne', 'fpvandoorn', 'github-actions', 'riccardobrasca']	nobody	21-26828 21 days ago	26-26297 26 days ago	92-58869 92 days
24719	madvorak author:madvorak	feat(LinearAlgebra/Matrix/NonsingularInverse): inverting `Matrix` inverts its `LinearEquiv`	--- Discussion: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2324719.20cannot.20find.20home/with/517142655	t-algebra label:t-algebra$	10/0	Mathlib/LinearAlgebra/Matrix/NonsingularInverse.lean	1	11	['eric-wieser', 'github-actions', 'madvorak']	nobody	21-20152 21 days ago	29-24997 29 days ago	30-61226 30 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 --- - [x] depends on: #22299 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	27/0	Mathlib/RingTheory/Ideal/GoingDown.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	21-9651 21 days ago	21-9775 21 days ago	21-13240 21 days
25036	Parcly-Taxel author:Parcly-Taxel	feat: IMO 2001 Q4		IMO	131/4	Archive.lean,Archive/Imo/Imo2001Q4.lean,Mathlib/Logic/Equiv/Fin/Rotate.lean	3	1	['github-actions']	nobody	20-51766 20 days ago	20-52508 20 days ago	20-52492 20 days
21624	sinhp author:sinhp	feat(CategoryTheory): The (closed) monoidal structure on the product category of families of (closed) monoidal categories	Given a family of closed monoidal categories, we show that the product of these categories is a closed monoidal category with the pointwise monoidal structure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	144/0	Mathlib.lean,Mathlib/CategoryTheory/Pi/Basic.lean,Mathlib/CategoryTheory/Pi/Monoidal.lean,Mathlib/CategoryTheory/Pi/MonoidalClosed.lean	4	19	['TwoFX', 'YaelDillies', 'b-mehta', 'github-actions', 'jcommelin', 'sinhp']	nobody	20-45417 20 days ago	20-45417 20 days ago	54-54882 54 days
24855	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 compute_degree register_hint field_simp register_hint finiteness -- "hint" now correctly suggests "compute_degree" which closes the goal (no closing tactic suggested prior to this PR) open Polynomial in example : natDegree ((X + 1) : Nat[X]) ≤ 1 := by hint -- "hint" now correctly suggests "field_simp" which closes the goal (no closing tactic suggested prior to this PR) example (R : Type) (a b : R) [CommRing R] (u₁ : Rˣ) : a /ₚ u₁ + b /ₚ u₁ = (a + b) /ₚ u₁ := by hint -- "hint" now correctly suggests "finiteness" which closes the goal (no closing tactic suggested prior to this PR) example (a : ℝ) : (ENNReal.ofReal (1 + a ^ 2))⁻¹ < ⊤ := by hint ```	t-meta awaiting-author	15/0	Mathlib/Tactic/ComputeDegree.lean,Mathlib/Tactic/FieldSimp.lean,Mathlib/Tactic/Finiteness.lean	3	7	['adomani', 'euprunin', 'github-actions', 'grunweg']	nobody	20-45388 20 days ago	20-45388 20 days ago	0-24945 6 hours
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$	215/155	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/RingTheory/Extension/Basic.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	7	['alreadydone', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-38962 20 days ago	20-39117 20 days ago	97-8246 97 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. --- - [x] depends on: #20071 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	69/0	Mathlib/Data/Seq/Seq.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	20-37866 20 days ago	27-81161 27 days ago	27-81310 27 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 --- - [x] depends on: #24071 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	155/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	17	['AntoineChambert-Loir', 'Thmoas-Guan', 'eric-wieser', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-35308 20 days ago	20-35328 20 days ago	94-79909 94 days
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$	442/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-35139 20 days ago	20-35158 20 days 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$	552/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-35082 20 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$	656/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	Blackfeather007 assignee:Blackfeather007	20-34999 20 days ago	unknown	unknown
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$	378/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-34810 20 days ago	20-34831 20 days ago	0-1204 20 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$	812/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-34730 20 days ago	unknown	unknown
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$	1039/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-34659 20 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$	1187/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-34612 20 days ago	unknown	unknown
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$	534/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-34552 20 days ago	20-34573 20 days ago	0-464 7 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 - [x] 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$	729/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-34488 20 days ago	unknown	unknown
24949	RemyDegenne author:RemyDegenne	feat: tightness from convergence of characteristic functions	If the characteristic functions of a sequence of measures `μ : ℕ → Measure E` on a finite dimensional inner product space converge pointwise to a function which is continuous at 0, then `{μ n \| n}` is tight. --- - [ ] depends on: #24838 - [x] depends on: #24846 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability blocked-by-other-PR WIP	352/2	Mathlib.lean,Mathlib/MeasureTheory/Measure/TightCharFun.lean,Mathlib/MeasureTheory/Measure/TightNormed.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	20-29663 20 days ago	20-29679 20 days ago	0-2 2 seconds
25044	alreadydone author:alreadydone	feat(Topology/Algebra): `Homeomorph` version of `unitsEquivNeZero`	also add `Topology.IsEmbedding.homeomorphImage`: a set is homeomorphic to its image under any embedding. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology label:t-algebra$	51/28	Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Homeomorph/Lemmas.lean	2	1	['github-actions']	nobody	20-28054 20 days ago	20-32309 20 days ago	20-32293 20 days
25042	alreadydone author:alreadydone	feat(Topology): restriction/extension of Trivialization and composition with Homeomorph	--- - [x] depends on: #25041 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	148/2	Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Maps/Basic.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	20-10483 20 days ago	20-18238 20 days ago	20-19618 20 days
24206	LessnessRandomness author:LessnessRandomness	feat(Geometry/Euclidean/Angle/Unoriented): triangle inequality for angles	Replace `proof_wanted` with proof. ---	new-contributor t-euclidean-geometry awaiting-author	221/11	Mathlib.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/TriangleInequality.lean	4	16	['LessnessRandomness', 'Timeroot', 'github-actions', 'jsm28', 'urkud']	jsm28 assignee:jsm28	19-77809 19 days ago	30-84002 30 days ago	20-6326 20 days
24928	kim-em author:kim-em	chore: remove some `Nat` shortcut instances		t-data	0/9	Mathlib/Algebra/Ring/Divisibility/Basic.lean,Mathlib/Data/List/TakeDrop.lean,Mathlib/Data/Nat/Basic.lean	3	10	['Ruben-VandeVelde', 'github-actions', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	19-67618 19 days ago	19-67618 19 days ago	25-43867 25 days
25068	Parcly-Taxel author:Parcly-Taxel	feat: IMO 2001 Q3		IMO	111/0	Archive.lean,Archive/Imo/Imo2001Q3.lean	2	1	['github-actions']	nobody	19-64371 19 days ago	19-67128 19 days ago	19-67112 19 days
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 for `card α ≤ card β` on the vertex type `V` have at most `(card β-1)^(1/(card α))(card V)^(2-1/(card α))/2 + (card V)(card α-1)/2` edges. --- - [x] depends on: #19865 - [x] depends on: #20738 I'd like to make `aux` not private in the `KovariSosTuran` namespace to enable reuse of the double-counting here, but I don't know what to call it. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	289/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/KovariSosTuran.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot']	awainverse assignee:awainverse	19-29414 19 days ago	41-69299 1 month ago	41-69833 41 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']	mariainesdff assignee:mariainesdff	19-29279 19 days ago	64-12686 2 months ago	110-85911 110 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$	66/4	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/GroupTheory/Index.lean,Mathlib/LinearAlgebra/Determinant.lean	4	10	['Ruben-VandeVelde', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'xroblot']	ericrbg assignee:ericrbg	19-29255 19 days ago	42-41084 1 month ago	78-83644 78 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$	615/3	Mathlib.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean	5	6	['BoltonBailey', 'Timeroot', 'github-actions', 'grunweg']	adomani assignee:adomani	19-28937 19 days ago	65-82525 2 months ago	65-82572 65 days
24260	plp127 author:plp127	feat(Topology): add API for Hereditarily Lindelof spaces	Copies the stuff about Lindelof spaces to Hereditarily Lindelof spaces. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	222/42	Mathlib/Topology/Compactness/Lindelof.lean	1	14	['github-actions', 'grunweg', 'urkud']	urkud assignee:urkud	19-28651 19 days ago	19-28690 19 days ago	29-42365 29 days
24931	qawbecrdtey author:qawbecrdtey	feat(Data/Nat/Sqrt): Added lemma `Nat.add_one_sqrt_le_of_pos`	--- This commit proves a single lemma `Nat.add_one_sqrt_le_of_pos`. ```lean lemma add_one_sqrt_le_of_pos {n : ℕ} (hn : 1 ≤ n) : (n + 1).sqrt ≤ n ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data easy	7/0	Mathlib/Data/Nat/Sqrt.lean	1	4	['Ruben-VandeVelde', 'eric-wieser', 'github-actions', 'qawbecrdtey']	nobody	19-23003 19 days ago	25-37853 25 days ago	25-37911 25 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 - [x] depends on: #24503 - [x] depends on: #24968 - [x] depends on: #25029	t-euclidean-geometry	556/0	Mathlib.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Geometry/Euclidean/Altitude.lean,Mathlib/Geometry/Euclidean/Incenter.lean	4	53	['JovanGerb', 'eric-wieser', 'github-actions', 'jsm28', 'mathlib4-dependent-issues-bot']	eric-wieser assignee:eric-wieser	19-26 19 days ago	20-11713 20 days ago	62-48480 62 days
25096	CBirkbeck author:CBirkbeck	feat(Analysis/NormedSpace/FunctionSeries): Add SummableUniformlyOn ve…	…rsions and derivwithin_tsum --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis	43/2	Mathlib/Analysis/NormedSpace/FunctionSeries.lean	1	1	['github-actions']	nobody	18-80632 18 days ago	18-82404 18 days ago	0-0 0 seconds
24333	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): cycle graph implementation for generic vertex types	The existing `cycleGraph` implementation under Combinatorics/SimpleGraph/Circulant.lean only operates over `Fin n`. This PR implements a cycle graph implementation over any generic vertex type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	187/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Cycle.lean	2	29	['IvanRenison', 'github-actions']	kmill assignee:kmill	18-68272 18 days ago	46-65829 1 month ago	46-65883 46 days
24703	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal): external product of diagrams in monoidal categories	Given functors `K₁ : J₁ ⥤ C` and `K₂ : J₂ ⥤ C` with values in a monoidal category, define a construction `externalProduct K₁ K₂` (denoted `K₁ ⊠ K₂`) as the bifunctor `(j₁, j₂) ↦ K₁ j₁ ⊗ K₂ j₂`. We show that composition of this construction with the diagonal functor to the product recovers the pointwise tensor product of functors, and we show that this construction satisfies a symmetry whenever `C` is braided. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	99/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct.lean	2	5	['github-actions', 'joelriou']	nobody	18-47098 18 days ago	18-47161 18 days ago	31-2826 31 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	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	18-39201 18 days ago	18-39224 18 days ago	46-26084 46 days
16074	Rida-Hamadani author:Rida-Hamadani	feat: combinatorial maps and planar graphs	We define combinatorial maps, then we define planar graph using combinatorial maps. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	243/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Planar.lean,Mathlib/Data/CombinatorialMap.lean	3	27	['Parcly-Taxel', 'Rida-Hamadani', 'github-actions', 'lambda-fairy', 'leanprover-community-bot-assistant']	kmill assignee:kmill	18-24212 18 days ago	43-35814 1 month ago	47-23245 47 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 awaiting-author	34/11	Cache/IO.lean,Cache/Main.lean	2	10	['eric-wieser', 'github-actions', 'joneugster', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	18-24127 18 days ago	18-24127 18 days ago	50-67617 50 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	59	['FLDutchmann', 'Paul-Lez', 'YaelDillies', 'eric-wieser', 'github-actions', 'grunweg', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	eric-wieser assignee:eric-wieser	18-24063 18 days ago	54-35449 1 month ago	109-82571 109 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`. 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$	30/0	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Set/Image.lean	2	5	['b-reinke', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	joelriou assignee:joelriou	18-23928 18 days ago	46-44557 1 month ago	59-45080 59 days
24139	yuanyi-350 author:yuanyi-350	feat: add `Fin.cycleIcc` which rotates `range(i, j)`	In this file, I define permutation `cycleIcc i j hij`, which is the cycle `(i i+1 .... j)` leaving `(0 ... i-1)` and `(j+1 ... n-1)` unchanged. In other words, it rotates elements in `[i, j]` one step to the right. Also I prove some properties of `cycleIcc i j hij` such as it is a cycle and its cycleType is `j - i` This definition is used to prove the following result: ``` theorem succAbove_comp_cycleIcc [NeZero n] (x : Fin (n + 1) → L) (i j : Fin (n + 1)) (eq : x i = x j) (lt : i < j) x ∘ i.succAbove = x ∘ j.succAbove ∘ (cycleIcc hij) ``` More clearly, `x ∘ i.succAbove` and `x ∘ j.succAbove` are `Fin n → L` types. For example, when `n = 6, i = 2, j = 5` and `x i = x j` ``` x ∘ i.succAbove = (x 0, x 1, x 3, x 4, x 5, x 6) x ∘ j.succAbove = (x 0, x 1, x 2, x 3, x 4, x 6) ``` We have ``` (x 0, x 1, x 3, x 4, x 5, x 6) --(cycleIcc)--->(x 0, x 1, x 5, x 3, x 4, x 6) = (x 0, x 1, x 2, x 3, x 4, x 6) ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	132/1	Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Nat/SuccPred.lean,Mathlib/GroupTheory/Perm/Fin.lean	4	27	['acmepjz', 'faenuccio', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mbkybky', 'yuanyi-350']	faenuccio assignee:faenuccio	18-23587 18 days ago	38-69996 1 month ago	52-84299 52 days
24546	jt496 author:jt496	feat(Combinatorics/SimpleGraph): add homOfConnectedComponents and related results	Given homomorphisms of each connected component of `G : SimpleGraph α` into `H : SimpleGraph β `give the corresponding `G →g H` Hence prove that G is n - colorable iff each connected component is n - colorable. Also prove that G is 2-colorable iff it does not contain an odd length loop (closed walk). I wasn't sure where to put this - it probably belongs in SimpleGraph.ConcreteColorings? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	36/0	Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean	3	3	['IvanRenison', 'github-actions', 'jt496']	b-mehta assignee:b-mehta	18-23441 18 days ago	38-24851 1 month ago	38-40361 38 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	255/81	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']	kmill assignee:kmill	18-21038 18 days ago	67-38583 2 months ago	101-35078 101 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 awaiting-author label:t-algebra$	176/0	Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Analysis/AbsoluteValue/Equivalence.lean	2	13	['Paul-Lez', 'faenuccio', 'github-actions', 'smmercuri']	faenuccio assignee:faenuccio	18-13427 18 days ago	18-13427 18 days ago	65-54803 65 days
25101	erdOne author:erdOne	feat(AlgebraicGeometry): building morphisms into Proj	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	231/3	Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Basic.lean,Mathlib/AlgebraicGeometry/Restrict.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean	4	6	['erdOne', 'github-actions', 'joelriou']	nobody	17-78571 17 days ago	17-78571 17 days ago	18-58260 18 days
25123	eric-wieser author:eric-wieser	feat: add rfl lemmas for monoidal categories	Making these `simp` opens a can of worms best left to #24823 `simps` would generate bad names here. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	111/0	Mathlib/Algebra/Category/AlgCat/Monoidal.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/QuadraticModuleCat/Monoidal.lean	3	1	['github-actions']	nobody	17-68079 17 days ago	17-68079 17 days ago	17-68132 17 days
25124	Parcly-Taxel author:Parcly-Taxel	feat: number of edges in the Turán graph	We provide two theorems, the first `card_edgeFinset_turanGraph` providing the exact number of edges and the other `card_edgeFinset_turanGraph_le` providing a (slightly) looser bound whose main advantage is its lack of integer division/modulus operations. The bound in `card_edgeFinset_turanGraph_le` is also the bound provided in [Motzkin and Straus (1965)](https://doi.org/10.4153%2FCJM-1965-053-6).	large-import t-combinatorics	132/0	Mathlib/Combinatorics/SimpleGraph/Turan.lean,Mathlib/Data/Nat/ModEq.lean	2	1	['github-actions']	nobody	17-63123 17 days ago	17-65948 17 days ago	17-65991 17 days
24485	dagurtomas author:dagurtomas	feat(CategoryTheory): localization preserves braided structure	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	733/427	Mathlib.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal/Basic.lean,Mathlib/CategoryTheory/Localization/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean	6	7	['dagurtomas', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant']	nobody	17-41565 17 days ago	17-41565 17 days ago	27-82564 27 days
24651	Hagb author:Hagb	feat(RingTheory/Finiteness/Defs): span of a set is finitely generated iff generated by a finite subset	--- - [ ] depends on: #24648 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	14/0	Mathlib/RingTheory/Finiteness/Defs.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	17-38635 17 days ago	17-38654 17 days ago	17-43206 17 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	41	['JovanGerb', 'b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'vasnesterov']	nobody	17-36555 17 days ago	67-74040 2 months ago	73-14281 73 days
24350	erdOne author:erdOne	feat(FieldTheory): fg extension over perfect field is separably generated	Co-authored-by: Christian Merten --- - [x] depends on: #24344 - [x] depends on: #24346 - [x] depends on: #24347 - [x] depends on: #24348 - [x] depends on: #24349 - [ ] depends on: #25062 [![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$	465/0	Mathlib.lean,Mathlib/FieldTheory/SeparablyGenerated.lean	2	3	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	17-35016 17 days ago	17-35017 17 days ago	0-16 16 seconds
24528	chrisflav author:chrisflav	feat(AlgebraicGeometry): directed covers	Directed covers are covers, where every intersection can be covered by a component of the cover. For open covers this is equivalent to the images forming a basis of the topology. If a cover is directed, the compatibility conditions for gluing become easier, because only compatibility with the transition maps needs to be checked. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	233/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Cover/Directed.lean	2	6	['chrisflav', 'erdOne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant']	nobody	17-25545 17 days ago	17-25612 17 days ago	34-10636 34 days
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. --- - [x] depends on: #22933 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	126/119	Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/RingHom/Finite.lean,Mathlib/RingTheory/RingHom/FiniteType.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	17-23901 17 days ago	17-25275 17 days ago	17-26487 17 days
25112	linesthatinterlace author:linesthatinterlace	feat(`Algebra/Group/Prod`): Add API for inclusion and projection maps from and to the product of units.	Adds API for inclusion and projection maps from and to the product of units. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	99/30	Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Data/Nat/Totient.lean,Mathlib/Topology/Algebra/Group/Basic.lean	4	9	['eric-wieser', 'github-actions', 'linesthatinterlace', 'pechersky']	nobody	17-23021 17 days ago	18-25288 18 days ago	18-25451 18 days
25069	erdOne author:erdOne	feat(EllipticCurve): rational points of singular nodal cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	251/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Node.lean	3	11	['Multramate', 'acmepjz', 'erdOne', 'github-actions']	nobody	17-16885 17 days ago	19-63787 19 days ago	19-63844 19 days
25135	vasnesterov author:vasnesterov	WIP/test PR for faster `tauto`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta WIP	14/6	Mathlib/Geometry/Manifold/IsManifold/InteriorBoundary.lean,Mathlib/Tactic/Tauto.lean,scripts/noshake.json	3	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	16-81351 16 days ago	16-81351 16 days ago	0-1 1 second
25133	erdOne author:erdOne	feat(Tactic/NormNum): support positive characteristic	Co-authored-by: Heather Macbeth --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta WIP	250/39	Mathlib/Tactic/NormNum/CharP.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/NormNum/Eq.lean,Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/NormNum/Test.lean	5	4	['erdOne', 'eric-wieser', 'github-actions']	nobody	16-74942 16 days ago	17-19962 17 days 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 please-adopt label:t-algebra$	322/0	Mathlib.lean,Mathlib/LinearAlgebra/DFinsupp/PiTensorProduct.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/DirectSum/PiTensorProduct.lean,Mathlib/LinearAlgebra/Multilinear/DFinsupp.lean,Mathlib/LinearAlgebra/Multilinear/DirectSum.lean	6	32	['Ruben-VandeVelde', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'smorel394']	nobody	16-69178 16 days ago	16-71383 16 days ago	6-23591 6 days
25071	erdOne author:erdOne	feat(EllipticCurve): basic API for singular cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	320/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	3	34	['Multramate', 'acmepjz', 'erdOne', 'github-actions']	nobody	16-60121 16 days ago	19-61944 19 days ago	19-62000 19 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. --- - [x] depends on: #22882 - [x] depends on: #23063 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	70/3	Mathlib/GroupTheory/Index.lean,Mathlib/LinearAlgebra/FreeModule/Finite/Quotient.lean,Mathlib/NumberTheory/NumberField/Units/Regulator.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	16-25473 16 days ago	16-25491 16 days ago	16-26436 16 days
25150	robin-carlier author:robin-carlier	feat(CategoryTheory/Bicategory): (2,1)-categories and `Pith`	This PR introduces a class `IsLocallyGroupoid` on bicategories, asserting that every hom-category has an `IsGroupoid` instance. With this definition, `IsLocallyGroupoid (LocallyDiscrete C)` is correctly inferred. Given a bicategory `B`, we introduce a type alias `Pith B` for `B` (realized as a one-field structure), and we equip it with a `Bicategory` instance where the hom-categories are the cores of the hom-categories of `B`. We show that this bicategory is a (2,1)-category, construct an inclusion pseudo-functor from `Pith B` to `B`, and show that every pseudofunctor from a (2,1)-category to `B` factors through this inclusion. --- We can’t fully state the fact that `(pseudofunctorToPith F).comp (inclusion F)` "is" `F` because #18254 is still not merged. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	191/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/LocallyGroupoid.lean	2	1	['github-actions']	nobody	16-15580 16 days ago	16-19133 16 days ago	16-19188 16 days
24497	Parcly-Taxel author:Parcly-Taxel	feat: IMO 1985 Q2		IMO	100/0	Archive.lean,Archive/Imo/Imo1985Q2.lean	2	1	['github-actions']	dwrensha assignee:dwrensha	16-10479 16 days ago	39-37793 1 month ago	39-37776 39 days
24517	upobir author:upobir	feat(Algebra/QuadraticDiscriminant): Adding inequalities on quadratic from inequalities on discriminant	--- This pr adds inequalities that relate `0` and `a * (x * x) + b * x + c` from inequalities of `a` and `discrim a b c`. For example, negative discriminant and negative leading coefficient implies value of quadratic expression is always negative and similar. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	35/0	Mathlib/Algebra/QuadraticDiscriminant.lean	1	1	['github-actions']	chrisflav assignee:chrisflav	16-10458 16 days ago	39-16657 1 month ago	39-16709 39 days
24522	dagurtomas author:dagurtomas	chore(Condensed): introduce an abbrev for the equivalence of light condensed sets with a category of sheaves on a small site	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-condensed	39/0	Mathlib.lean,Mathlib/Condensed/Light/Small.lean	2	1	['github-actions']	joneugster assignee:joneugster	16-10408 16 days ago	39-9950 1 month ago	39-10005 39 days
24685	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Preserves): Preservations of (co)limits by bifunctors	Introduce a typeclass `PreservesColimit₂` that bundles the assumption that a bifunctor preserves a pair of colimit diagrams in each of its variables. This is stated in terms of a construction `Functor.mapCocone₂` that applies a bifunctor `G` to a pair of cocones to get a cocone over the uncurryfication of `whiskeringLeft₂ _\|>.obj _\|>.obj _\|>.obj G`. The cocone points of this construction is definitionally the evaluation of `G` at the cocone points of the two cocones given as parameters. We give helper functions to extract isomorphisms with abstract colimits out of this typeclass, and we characterize these isomorphisms with respect to the canonical maps to the colimits. The dual typeclass for limits is also introduced. --- The definition of `Functor.mapCocone₂` and of `PreservesColimit₂` is due to @joelriou and was suggested during review of #17781. This PR only contains basic definitions, but does not give any interesting ways of inferring a `PreservesColimit₂` instance. This will be the content of a follow-up PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	243/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Preserves/Bifunctor.lean	2	1	['github-actions']	joelriou assignee:joelriou	16-10290 16 days ago	32-15906 1 month ago	32-15960 32 days
19456	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Data/Finsupp/MonomialOrder/DegRevLex): homogeneous reverse lexicographic order	Definition of the homogeneous reverse lexicographic order --- - [x] depends on: #19453 - [x] depends on: #19455 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-order t-algebraic-geometry WIP	362/0	Mathlib.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/Finsupp/MonomialOrder/DegRevLex.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	16-8835 16 days ago	16-8835 16 days ago	0-1720 28 minutes
24213	BoltonBailey author:BoltonBailey	feat: add simp lemmas for trig functions on `π * 2⁻¹`	This PR adds a number of simp lemmas to reduce trig functions evaluated on `π * 2⁻¹`. This allows `simp` to reduce expressions such as `sin (π * (1 / 2))` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	45/0	Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean	1	3	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant']	YaelDillies assignee:YaelDillies	16-2360 16 days ago	31-9258 1 month ago	49-66650 49 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	5	['dagurtomas', 'gio256', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	15-86359 15 days ago	51-83505 1 month ago	90-28708 90 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	7	['eric-wieser', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	15-79369 15 days ago	15-79390 15 days ago	0-0 0 seconds
25157	wwylele author:wwylele	feat(Data/Real): add embedding of archimedean groups into Real	This is part of #25140, and is the special case of Hahn embedding theorem applied to archimedean group. The construction is rather unpleasant as it uses explicit Cauchy sequence with essentially the binary representation of numbers, but I haven't found a better way to do this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	288/0	Mathlib.lean,Mathlib/Data/Real/Embedding.lean	2	3	['eric-wieser', 'github-actions', 'wwylele']	nobody	15-74090 15 days ago	16-11777 16 days ago	16-11830 16 days
25105	erdOne author:erdOne	feat(AlgebraicGeometry): inverse limit of nonempty quasicompact closeds is nonempty	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebraic-geometry	92/2	Mathlib/AlgebraicGeometry/AffineTransitionLimit.lean,Mathlib/AlgebraicGeometry/Morphisms/Separated.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean	3	1	['github-actions']	nobody	15-64061 15 days ago	18-42130 18 days ago	18-42182 18 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 awaiting-author	258/1	Mathlib.lean,Mathlib/AlgebraicGeometry/Morphisms/AffineAnd.lean,Mathlib/AlgebraicGeometry/Morphisms/Descent.lean,Mathlib/RingTheory/RingHomProperties.lean	4	15	['chrisflav', 'erdOne', 'github-actions']	erdOne assignee:erdOne	15-63881 15 days ago	15-63881 15 days ago	50-4378 50 days
24816	ciskiko author:ciskiko	feat(GroupTheory): add Regular Wreath Product	feat: add regular wreath product and some results; add iterated wreath product; add the isomorphism of iterated wreath product of Z_p to sylow p subgroup of S_{p^n}. Needs some work simplifying final result. --- [![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$	285/1	Mathlib.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/GroupTheory/RegularWreathProduct.lean,Mathlib/Logic/Equiv/Fin/Basic.lean,Mathlib/SetTheory/Cardinal/Finite.lean	7	102	['ciskiko', 'github-actions', 'tb65536']	tb65536 assignee:tb65536	15-33430 15 days ago	15-33431 15 days ago	24-38027 24 days
24819	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/MvPolynomial/Groebner): add docstring and a particular case	* add a new division theorem when one divides by a single polynomial * add docstrings to the three division theorems --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	27/3	Mathlib/RingTheory/MvPolynomial/Groebner.lean	1	4	['Hagb', 'github-actions']	nobody	15-12814 15 days ago	28-6092 28 days ago	28-6144 28 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$	239/0	Mathlib.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Category/Ring/Topology.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,scripts/noshake.json	7	21	['dagurtomas', 'erdOne', 'github-actions', 'kbuzzard']	nobody	15-7653 15 days ago	27-12564 27 days ago	109-40479 109 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	48/24	Mathlib/Topology/Separation/Regular.lean,Mathlib/Topology/UniformSpace/OfCompactT2.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	15-3140 15 days ago	15-3162 15 days ago	46-79521 46 days
25183	YaelDillies author:YaelDillies	feat: convolution product on linear maps from a coalgebra to an algebra	Construct the ring structure on linear maps `C → A` where `C` is a coalgebra and `A` an algebra, where multiplication is given by `(f * g)(x) = ∑ f x₍₁₎ * g x₍₂₎` in Sweedler notation or ``` \| μ \| \| / \ f * g = f g \| \| \ / δ \| ``` diagrammatically, where `μ` stands for multiplication and `δ` for comultiplication. [Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/.60Mul.60.20instance.20on.20algebra.20homomorphisms.20from.20monoid.20algebra) From Toric Co-authored-by: Michał Mrugała Co-authored-by: Yunzhou Xie --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	137/0	Mathlib.lean,Mathlib/RingTheory/Coalgebra/Convolution.lean	2	14	['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions']	nobody	15-2432 15 days ago	15-2493 15 days ago	15-6417 15 days
25197	eric-wieser author:eric-wieser	feat: Finset.sum induction for tensor products.	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	81/0	Mathlib/LinearAlgebra/TensorProduct/Basic.lean	1	1	['github-actions']	nobody	14-72847 14 days ago	14-72854 14 days ago	0-0 0 seconds
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$	104/0	Mathlib.lean,Mathlib/GroupTheory/FreeGroup/ReducedWords.lean	2	37	['b-reinke', 'github-actions', 'tb65536', 'vlad902']	nobody	14-59970 14 days ago	74-25781 2 months ago	74-33611 74 days
25188	vlad902 author:vlad902	feat: add lemmas about `List.scanr`	I add basic lemmas to reason about `List.scanr`, and slightly clean-up the file and add some basic lemmas to keep the API unified with the one for `List.scanl`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	84/18	Mathlib/Data/List/Scan.lean	1	5	['b-mehta', 'github-actions', 'vlad902']	nobody	14-48841 14 days ago	14-49069 14 days ago	14-72569 14 days
25204	YaelDillies author:YaelDillies	refactor: redefine `ProperCone` as an `abbrev` for `ClosedSubmodule`	... and derive the `ProperCone` operations from `ClosedSubmodule` too. Also rename the scalar ring from `𝕜` to `R`. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-analysis	79/90	Mathlib/Analysis/Convex/Cone/Proper.lean	1	1	['github-actions']	nobody	14-37093 14 days ago	14-37135 14 days ago	14-37146 14 days
24862	grunweg author:grunweg	feat(LocallyIntegrable): generalise more to enorms	--- - [ ] depends on: #24352 - [ ] open question: filter lemmas; IsBoundedUnder is not the right condition as-is; need to think (or just not generalise) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson t-measure-probability WIP	171/88	Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	14-30975 14 days ago	14-30975 14 days ago	0-1 1 second
8102	miguelmarco author:miguelmarco	feat(Tactic): add `unify_denoms` and `collect_signs` tactics	This PR adds four new tactics: - `unify_denoms` tries to put expressions with several divisions in a form with only one division. In the case of fields, it works similarly to `field_simp`, but if the hypothesis about denominators being nonzero are not present, it assumes them, and leaves them as new goals to prove. In that sense, it is an "unsafe" tactic (but can be useful nevertheless, for example when you can't find which exact hypothesis is missing). It also works with expressions of naturals and Euclidean domains, assuming the corresponding hypothesis about the denominators dividing the numerators. - `unify_denoms!` extends `unify_denoms` to work with (in)equalities, assuming also that the denominators, once in normal form, are positive. - `collect_signs` works similarly with expressions using sums and substractions: it tries to put them in a form of one sum minus other sum. In the case of working with naturals, it assumes that we never substract a bigger number from a smaller one. Both are implemented essentially as a macro that combines several rewriting rules. Some new lemmas with the corresponding rules are added. ---	new-contributor t-meta please-adopt modifies-tactic-syntax good first issue	407/0	Mathlib.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CollectSigns.lean,Mathlib/Tactic/UnifyDenoms.lean,MathlibTest/unify_denoms.lean,scripts/noshake.json	7	54	['Paul-Lez', 'YaelDillies', 'github-actions', 'joneugster', 'kbuzzard', 'miguelmarco']	Paul-Lez assignee:Paul-Lez	14-24186 14 days ago	26-4939 26 days ago	22-16933 22 days
25209	upobir author:upobir	feat(NumberTheory/Divisors): add int divisors	--- this PR adds `Int.divisors` analogous to `Nat.divisors`. Some preliminary results are proven for the new definition. Imports have also been modified by using `#min_imports` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	125/4	Mathlib/NumberTheory/Divisors.lean	1	8	['Paul-Lez', 'eric-wieser', 'github-actions', 'upobir']	nobody	14-18151 14 days ago	14-24775 14 days ago	14-24832 14 days
24050	Paul-Lez author:Paul-Lez	feat(Data/Finsupp/Pointwise): generalise pointwise scalar multiplication of finsupps	As pointed out by @eric-wieser, this creates an instance diamond with `SMul (α → β) (α →₀ (α → β))` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	7/4	Mathlib/Data/Finsupp/Pointwise.lean	1	6	['Paul-Lez', 'eric-wieser', 'github-actions']	nobody	14-10564 14 days ago	55-85262 1 month ago	55-85314 55 days
25070	erdOne author:erdOne	feat(EllipticCurve): rational points on singular cuspidal cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	123/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Cusp.lean	2	9	['Multramate', 'acmepjz', 'erdOne', 'github-actions', 'kckennylau']	nobody	14-1019 14 days ago	19-63820 19 days ago	19-63817 19 days
24753	vasnesterov author:vasnesterov	feat(Tactic/Order): translate linear orders to `Int`	It was [pointed out](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/tactic.20for.20partial.20orders/near/515897754) that `order` is not complete for linear orders with lattice operations (while it remains complete for linear orders without lattice operations and for general lattices without assuming linearity). The problem for linear orders with lattice operations is NP-hard, but it can be translated from an arbitrary type to `Int` and then solved using a smart and efficient procedure (such as `omega`). This PR implements such a translation within the `order` tactic. Co-authored-by: Aaron Liu --- - [ ] depends on: #21966 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta blocked-by-other-PR	578/59	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Order.lean,Mathlib/Tactic/Order/CollectFacts.lean,Mathlib/Tactic/Order/Graph/Basic.lean,Mathlib/Tactic/Order/Preprocessing.lean,Mathlib/Tactic/Order/ToInt.lean,MathlibTest/order.lean,scripts/noshake.json	9	3	['github-actions', 'mathlib4-dependent-issues-bot', 'plp127']	nobody	14-30 14 days ago	29-27982 29 days ago	0-654 10 minutes
25208	erdOne author:erdOne	feat(LinearAlgebra): `tensor_induction` macro	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC WIP label:t-algebra$	87/116	Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Central/TensorProduct.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/RingTheory/Flat/Equalizer.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/Finite.lean,Mathlib/RingTheory/Unramified/Finite.lean	8	7	['chrisflav', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	13-84587 13 days ago	14-26594 14 days ago	0-600 10 minutes
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. Co-authored-by: Aaron Liu --- The current draft displays the old code for comparison with new versions labeled ALT. After initial review this will be cut. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos t-topology t-category-theory	490/202	Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/EqToHom.lean	6	17	['emilyriehl', 'github-actions', 'joelriou']	nobody	13-65658 13 days ago	20-7827 20 days ago	26-75823 26 days
25182	YaelDillies author:YaelDillies	feat: `(M →* N₁) ≃* (M →* N₂)` if `N₁ ≃* N₂`	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	63/12	Mathlib/Algebra/Category/Grp/ForgetCorepresentable.lean,Mathlib/Algebra/Category/Grp/LargeColimits.lean,Mathlib/Algebra/Category/MonCat/ForgetCorepresentable.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/GroupTheory/FiniteAbelian/Duality.lean	5	10	['YaelDillies', 'eric-wieser', 'github-actions']	nobody	13-48712 13 days ago	14-41952 14 days ago	15-32593 15 days
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`. --- - [x] depends on: #21744 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology t-category-theory	253/7	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	1	21	['dagurtomas', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	13-47257 13 days ago	25-41685 25 days ago	48-49632 48 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$	161/146	Mathlib/GroupTheory/MonoidLocalization/Away.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/DivPairs.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/RingTheory/Localization/Defs.lean,Mathlib/RingTheory/Valuation/ExtendToLocalization.lean	6	3	['github-actions', 'leanprover-community-bot-assistant']	ericrbg assignee:ericrbg	13-26690 13 days ago	13-26707 13 days ago	91-48456 91 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 - [x] depends on: #23962 - [x] depends on: #24107 - [x] depends on: #24167 - [x] depends on: #24117 - [x] 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$	796/5	Mathlib.lean,Mathlib/Algebra/Group/End.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	8	9	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	riccardobrasca assignee:riccardobrasca	13-20190 13 days ago	13-30604 13 days ago	0-12 12 seconds
25240	IvanRenison author:IvanRenison	feat(Analysis/InnerProductSpace/Projection): add lemma `Submodule.le_iff_orthogonal_le_orthogonal` and similars	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	25/0	Mathlib/Analysis/InnerProductSpace/Projection.lean	1	1	['github-actions']	nobody	13-15930 13 days ago	13-15933 13 days ago	13-15986 13 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$	57/65	Mathlib/Algebra/Field/Equiv.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/GroupWithZero/Units/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	13	4	['alreadydone', 'github-actions', 'xroblot']	nobody	13-6805 13 days ago	65-72197 2 months ago	65-72217 65 days
25224	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): edgeSet of Eulerian walk equal to edgeSet of graph	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics easy	6/0	Mathlib/Combinatorics/SimpleGraph/Trails.lean	1	2	['IvanRenison', 'github-actions']	nobody	12-83709 12 days ago	13-74712 13 days ago	13-75614 13 days
25225	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): Eulerian walk in connected graph contains all vertices	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	16/0	Mathlib/Combinatorics/SimpleGraph/Trails.lean	1	3	['IvanRenison', 'github-actions']	nobody	12-83102 12 days ago	13-74514 13 days ago	13-74571 13 days
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. --- - [x] depends on: #24167 - [x] depends on: #24117 - [x] depends on: #24107 - [x] depends on: #23962 - [x] 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$	1573/6	Mathlib.lean,Mathlib/Algebra/Group/End.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	9	7	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	riccardobrasca assignee:riccardobrasca	12-82269 12 days ago	13-26437 13 days ago	2-27612 2 days
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 `⊤`. --- - [x] depends on: #24167 - [x] depends on: #24117 - [x] depends on: #24107 - [x] depends on: #23962 - [x] 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$	1573/6	Mathlib.lean,Mathlib/Algebra/Group/End.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	9	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	riccardobrasca assignee:riccardobrasca	12-81407 12 days ago	12-81425 12 days ago	1-57991 1 day
25248	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): Add Subgraph.inclusion_edge_apply_coe and inclusion_edgeSet_apply_coe	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	12/0	Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	1	1	['github-actions']	nobody	12-76744 12 days ago	12-76745 12 days ago	12-76800 12 days
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$	91/17	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	16	['alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'mathlib4-dependent-issues-bot']	erdOne assignee:erdOne	12-72577 12 days ago	12-72595 12 days ago	55-19940 55 days
25238	Hagb author:Hagb	feat(Tactic/ComputeDegree): add support for scalar multiplication with different types	It would be able to deal with `a • (X : R[X])` where `a : S` is in a different type `S` with `[SMulZeroClass S R]`. --- - [x] depends on: #25237 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	17/5	Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	12-56734 12 days ago	12-81177 12 days ago	12-83080 12 days
24690	ScottCarnahan author:ScottCarnahan	feat (Data.Prod): Reverse lexicographic order	This PR implements the type synonym RevLex as a one-field structure, defines an order on products, and proves an order isomorphism with the Lex product with factors switched. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order WIP	141/0	Mathlib.lean,Mathlib/Data/Prod/RevLex.lean	2	4	['ScottCarnahan', 'YaelDillies', 'github-actions']	YaelDillies assignee:YaelDillies	12-50280 12 days ago	12-61973 12 days ago	19-33859 19 days
25153	eric-wieser author:eric-wieser	feat(Algebra/ModEq): a lemma about `[PMOD (n • p)]`	This ultimately didn't end up very useful to me, but I think it's still a nice result. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	20/0	Mathlib/Algebra/ModEq.lean	1	3	['YaelDillies', 'eric-wieser', 'github-actions']	nobody	12-48292 12 days ago	16-14031 16 days ago	16-14015 16 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	65/0	Mathlib.lean,Mathlib/Geometry/Convex/Polytope.lean,Mathlib/Geometry/Convex/README.md	3	7	['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	12-45087 12 days ago	12-45105 12 days ago	59-44919 59 days
25253	Ruben-VandeVelde author:Ruben-VandeVelde	feat: add AlgHom.natCard_of_splits	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		21/7	Mathlib/FieldTheory/PrimitiveElement.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/SetTheory/Cardinal/Finite.lean	3	1	['github-actions']	nobody	12-43025 12 days ago	12-43107 12 days ago	12-43091 12 days
24804	Moises-Herradon-Cueto author:Moises-Herradon-Cueto	feat(CategoryTheory/Limits/Preserves/Shapes): show that if a functor preserves limits, so does `Over.post`	If a functor `F` preserves limits (of a certain shape, finite, or of a certain size), then so does the induced functor on `Over` categories. From Toric Co-authored-by: Yaël Dillies --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric new-contributor t-category-theory	125/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Over.lean,Mathlib/CategoryTheory/WithTerminal/Basic.lean	3	17	['Moises-Herradon-Cueto', 'YaelDillies', 'erdOne', 'github-actions', 'joelriou']	nobody	12-42970 12 days ago	13-18912 13 days ago	19-23308 19 days
24304	YaelDillies author:YaelDillies	feat: continuous perfect pairings	Define continuous perfect pairings using a Prop-valued typeclass `IsContPerfPair` on a bilinear pairing `p : M →ₗ[R] N →ₗ[R] R`, and a function to turn `p : M →ₗ[R] N →ₗ[R] R` + `p.IsContPerfPair` into `M ≃ₗ[R] (N →ₗ[R] R)`. The name `IsContPerfPair` is kept short because it shows up in lemma and definition names. Mathematically, there are many topological notions of perfect pairing: one per topology on `N →ₗ[R] R`/`N →L[R] R`. It is therefore better for `IsContPerfPair` not to require `p x` to be a homeo, and to instead extend it to new classes like `IsWeakTopPerfPair`, `IsCompactOpenPerfPair`, etc... whenever we need it to imply some reflexivity result for a particular norm on linear maps. There's also the question of continuity. Most applications need only continuity in either argument, but currently we are requiring continuity in both arguments simultaneously, ie as a map `M × N → R`. This is an easy way to ensure we get a map `N → M →L[R] R`. From Toric Co-authored-by: Andrew Yang --- `PerfectPairing` can be similarly refactored, but this should be a later PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-topology	71/0	Mathlib.lean,Mathlib/Topology/Algebra/Module/PerfectPairing.lean	2	8	['ADedecker', 'YaelDillies', 'erdOne', 'github-actions', 'ocfnash']	ADedecker assignee:ADedecker	12-34873 12 days ago	13-47395 13 days ago	47-42005 47 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 awaiting-author	691/0	Mathlib/Topology/FiberBundle/Instances/GBundleDefs.lean,Mathlib/Topology/FiberBundle/Instances/Mobius.lean,Mathlib/Topology/FiberBundle/Instances/MobiusAsGBundle.lean	3	4	['eric-wieser', 'idontgetoutmuch']	nobody	12-33132 12 days ago	23-45450 23 days ago	0-0 0 seconds
25179	YaelDillies author:YaelDillies	feat: `#track_sorry`, a command to find usage of `sorry`	`#track_sorry foo` returns a non-sorry-free declaration `bar` which `foo` depends on, if such `bar` exists. Such a command is a recurrent need of the community, see eg [here](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Hunting.20down.20axioms/with/495448595) most recently. From Toric Co-authored-by: Henrik Böving --- An alternative implementation was provided in [#Is there code for X? > ✔ Finding usages of `sorry` in external code @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/.E2.9C.94.20Finding.20usages.20of.20.60sorry.60.20in.20external.20code/near/430509619) by @kmill. I prefer the current one because it only prints something for uses of `sorry` and not the other three standard axioms. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-meta	71/0	Mathlib.lean,Mathlib/Util/TrackSorry.lean	2	11	['YaelDillies', 'eric-wieser', 'github-actions', 'kmill']	nobody	12-33079 12 days ago	15-41894 15 days ago	15-41948 15 days
25257	Hagb author:Hagb	feat(Mathlib/Algebra/Polynomial/Degree/Domain.lean): generalize `natDegree_smul` from `SMulWithZero` to `SMulZeroClass`	as suggested by @eric-wieser in https://github.com/leanprover-community/mathlib4/pull/25237#discussion_r2111599865 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	4/3	Mathlib/Algebra/Polynomial/Degree/Domain.lean	1	1	['github-actions']	nobody	12-26109 12 days ago	12-26109 12 days ago	12-26171 12 days
25261	hanwenzhu author:hanwenzhu	feat(ProbabilityTheory): Conditional Jensen	WIP cc @CoolRmal Co-authored-by: Yongxi Lin <97214596+CoolRmal@users.noreply.github.com> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		27/0	test.lean	1	1	['github-actions']	nobody	12-17195 12 days ago	12-17266 12 days ago	0-0 0 seconds
25262	Ruben-VandeVelde author:Ruben-VandeVelde	chore: add missing deprecations	From #23643, #23804, #24762, #24827, #24833, and #25016. --- Maybe for some of those there could be reasons to argue that a deprecation is not terribly useful, but adding them is so cheap that I don't think it's worth spending much time arguing about it. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		36/0	Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSqIntegral.lean,Mathlib/GroupTheory/Perm/Finite.lean,Mathlib/GroupTheory/Perm/Support.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/TotallyRealComplex.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/MvPowerSeries/PiTopology.lean	8	1	['github-actions']	nobody	12-15004 12 days ago	12-17260 12 days ago	12-17244 12 days
25251	YaelDillies author:YaelDillies	chore: move pointed cones, proper cones	Pointed cones too are a kind of algebraic cone. They therefore move to the new `Geometry.Convex.Cone` folder. In turn, this makes proper cones the primitive kind of topological/analytic cones, and therefore `Analysis.Convex.Cone.Proper` gets renamed to `Analysis.Convex.Cone.Basic`. The two sections about dual pointed cones and dual proper cones move to the existing `Analysis.Convex.Cone.InnerDual`. The READMEs about `Geometry.Convex.Cone` and `Analysis.Convex.Cone` get updated to reflect that the separation is non-topology vs topology, rather topology vs analysis. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed toric large-import t-analysis	112/115	Mathlib.lean,Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Analysis/Convex/Cone/Closure.lean,Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Analysis/Convex/Cone/README.md,Mathlib/Geometry/Convex/Cone/Basic.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean,Mathlib/Geometry/Convex/Cone/README.md	8	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	12-12573 12 days ago	12-20075 12 days ago	12-36173 12 days
25266	j-loreaux author:j-loreaux	feat: add path component of the identity in a locally path connected topological group, as an open normal subgroup	--- From [LeanOA](https://github.com/j-loreaux/LeanOA) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	101/8	Mathlib.lean,Mathlib/Topology/Connected/PathComponentOne.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Path.lean	4	1	['github-actions']	nobody	12-7869 12 days ago	12-10701 12 days ago	12-11347 12 days
25271	YaelDillies author:YaelDillies	feat: promote an `AlgEquiv` preserving `counit` and `comul` to a `BialgEquiv`	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	38/24	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean	3	1	['github-actions']	nobody	12-6409 12 days ago	12-10058 12 days ago	12-10053 12 days
24131	AntoineChambert-Loir author:AntoineChambert-Loir	feat: a theorem of Jordan on primitive subgroups of the permutation group	A theorem of Jordan on the primitive subgroups of a permutation group: * if it contains a swap, it is equal to the permutation group, * if it contains a 3-cycle, it contains the alternating group. --- - [x] depends on: #24167 - [x] depends on: #24117 - [x] depends on: #24107 - [x] depends on: #23962 - [x] 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/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	2079/40	Mathlib.lean,Mathlib/Algebra/Group/End.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/SetTheory/Cardinal/Embedding.lean	10	8	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	12-317 12 days ago	12-3252 12 days ago	0-1323 22 minutes
25283	Brian-Nugent author:Brian-Nugent	feat: regular local rings	Adds regular local rings and proves they are integral domains. --- - [ ] depends on: #25280 - [ ] depends on: #25282 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra blocked-by-other-PR label:t-algebra$	871/0	.vscode/settings.json,Mathlib.lean,Mathlib/RingTheory/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRingDimension.lean,Mathlib/RingTheory/RegularLocalRing.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	11-84684 11 days ago	11-84686 11 days ago	0-882 14 minutes
25282	Brian-Nugent author:Brian-Nugent	feat: krull dimension facts for Noetherian local rings	Proves that when modding out by a non-unit, the Krull dimension of a noetherian local ring drops by at most one. Also proves that the embedding dimension is an upper bound on the Krull dimension. --- - [ ] depends on: #25280 [![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$	626/0	.vscode/settings.json,Mathlib.lean,Mathlib/RingTheory/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRingDimension.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	11-84683 11 days ago	11-84685 11 days ago	0-1566 26 minutes
25173	Timeroot author:Timeroot	"Junk value" test file	Add to MathlibTest a file that documents junk values of many functions, and explains some of their motivations and gotchas. --- Based on the conversation [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/Documenting.20lean.20pitfalls.3A.20feedback.20requested/near/520155520). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		362/2	Mathlib/Data/Nat/Find.lean,MathlibTest/Junk.lean	2	15	['Timeroot', 'github-actions', 'plp127']	nobody	11-84537 11 days ago	15-59398 15 days ago	15-59382 15 days
25247	alreadydone author:alreadydone	Projective contraction	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	160/31	Mathlib/Data/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/RingTheory/Finiteness/Finsupp.lean	4	1	['github-actions']	nobody	11-79860 11 days ago	12-80718 12 days ago	0-30 30 seconds
24582	pechersky author:pechersky	feat(GroupTheory/ArchimedeanDensely): Unique (ℤ ≃+o ℤ)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #24580	t-order t-algebra label:t-algebra$	44/0	Mathlib/Data/Int/Cast/Lemmas.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean	2	5	['eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'pechersky']	nobody	11-65302 11 days ago	11-65375 11 days ago	15-28500 15 days
24412	pechersky author:pechersky	feat(UniformSpace/Ultra/Constructions): IsUltraUniformity.{bot,top}	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology	29/0	Mathlib/Order/Filter/Bases/Basic.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/Ultra/Basic.lean,Mathlib/Topology/UniformSpace/Ultra/Constructions.lean	4	6	['github-actions', 'pechersky', 'urkud']	urkud assignee:urkud	11-64083 11 days ago	11-67293 11 days ago	36-64253 36 days
22919	plp127 author:plp127	feat(Data/Fintype/Pi): Make `Fintype` instance for `RelHom`s computable	Makes the `Fintype` instance for rel homs computable. See this [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Classical.20vs.20constructive.20logic.20in.20computation/near/496220816) message. --- - [x] depends on: #24748 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	178/44	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Data/Fintype/CardEmbedding.lean,Mathlib/Data/Fintype/Pi.lean	5	29	['IvanRenison', 'b-mehta', 'eric-wieser', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'plp127']	b-mehta assignee:b-mehta	11-58021 11 days ago	11-58021 11 days ago	73-73341 73 days
25161	BoltonBailey author:BoltonBailey	chore(Algebra/Squarefree/Basic): fix erw	This PR addresses an instance of the `erw` linter in `Algebra/Squarefree/Basic` by adding a `squarefree_def` theorem and using this to isolate the implementation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-algebra awaiting-author label:t-algebra$	4/1	Mathlib/Algebra/Squarefree/Basic.lean	1	3	['b-mehta', 'eric-wieser', 'github-actions']	nobody	11-57924 11 days ago	11-57924 11 days ago	4-35623 4 days
25239	YaelDillies author:YaelDillies	refactor: redefine perfect pairings as a Prop-valued typeclass	Redefine perfect pairings using a Prop-valued typeclass `IsPerfPair` on a bilinear pairing `p : M →ₗ[R] N →ₗ[R] R`, and a function to turn `p : M →ₗ[R] N →ₗ[R] R` + `p.IsPerfPair` into `M ≃ₗ[R] Dual R N`. The name `IsPerfPair` is kept short because it shows up in lemma and definition names. From Toric --- @ocfnash, do you like the direction this is going in? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra awaiting-CI label:t-algebra$	277/164	Mathlib/LinearAlgebra/PerfectPairing/Basic.lean,Mathlib/LinearAlgebra/PerfectPairing/Restrict.lean,Mathlib/LinearAlgebra/RootSystem/Defs.lean,Mathlib/LinearAlgebra/RootSystem/Hom.lean,Mathlib/LinearAlgebra/RootSystem/IsValuedIn.lean,Mathlib/LinearAlgebra/RootSystem/OfBilinear.lean	6	10	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'ocfnash']	nobody	11-45140 11 days ago	11-45157 11 days ago	1-235 1 day
25273	YaelDillies author:YaelDillies	feat: `Finsupp.linearCombination MonoidAlgebra.of = id`	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	8/1	Mathlib/Algebra/MonoidAlgebra/Defs.lean	1	4	['YaelDillies', 'eric-wieser', 'github-actions']	nobody	11-40091 11 days ago	12-8231 12 days ago	12-8280 12 days
25292	YaelDillies author:YaelDillies	feat: the `ConvexCone` generated by a set	Define `ConvexCone.copy` and `ConvexCone.hull` and use them to golf the `CompleteLattice` instance. From Toric --- - [ ] depends on: #25291 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry toric blocked-by-other-PR	217/214	Mathlib/Analysis/Convex/Cone/Pointed.lean,Mathlib/Geometry/Convex/Cone/Basic.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	11-37547 11 days ago	11-40576 11 days ago	0-690 11 minutes
25291	YaelDillies author:YaelDillies	chore(Geometry/Convex/Cone/Basic): clean up	Rename all the `ConvexCone`s in the file to `C`, `C₁`, `C₂`. Previously they were `S`, `T`, `K₁`, `K₂`. Make sure to tag all the relevant lemmas with `norm_cast`. Fix lemma names. Golf proofs. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry toric	145/186	Mathlib/Analysis/Convex/Cone/Pointed.lean,Mathlib/Geometry/Convex/Cone/Basic.lean	2	1	['github-actions']	nobody	11-36836 11 days ago	11-41271 11 days ago	11-41327 11 days
7300	ah1112 author:ah1112	feat: synthetic geometry	This is adding synthetic geometry using Avigad's axioms and formalizing Euclid Book I, through the Pythagorean theorem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry awaiting-author help-wanted	2661/0	Mathlib.lean,Mathlib/Geometry/Synthetic/Avigad/Axioms.lean,Mathlib/Geometry/Synthetic/Avigad/EuclidBookI.lean,Mathlib/Geometry/Synthetic/Avigad/Tactics.lean	4	72	['ah1112', 'alreadydone', 'eric-wieser', 'github-actions', 'tb65536', 'urkud']	nobody	11-18588 11 days ago	502-85828 1 year ago	0-0 0 seconds
25290	linesthatinterlace author:linesthatinterlace	feat: Low-level derivatives of lifts on `OneHom`, `MulHom` and `MonoidHom`	--- - [ ] depends on: #25264 [![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$	652/33	Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean	3	3	['github-actions', 'linesthatinterlace', 'mathlib4-dependent-issues-bot']	nobody	11-9838 11 days ago	11-42240 11 days ago	0-762 12 minutes
22490	joelriou author:joelriou	feat(CategoryTheory/Functor): pointwise right derived functors	This PR introduces pointwise right derived functors as particular cases of pointwise left Kan extensions. --- - [x] depends on: #22474 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	160/0	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/PointwiseRightDerived.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	11-8730 11 days ago	11-8995 11 days ago	11-11016 11 days
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 label:t-algebra$	352/22	Mathlib.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LinearMap/Pi.lean,Mathlib/Algebra/Module/LinearMap/Prod.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,scripts/noshake.json	8	22	['eric-wieser', 'github-actions', 'lecopivo']	nobody	11-7081 11 days ago	11-7081 11 days ago	11-25466 11 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	4	['fbarroero', 'github-actions', 'mans0954']	ericrbg assignee:ericrbg	10-82258 10 days ago	81-2744 2 months ago	81-2735 81 days
15412	mans0954 author:mans0954	feat(Order/ScottContinuity): Scott continuity on product spaces	Some further results on Scott Continuity: - `scottContinuous_iff_map_sSup`: `f` is Scott continuous if and only if it commutes with `sSup` on directed sets - `ScottContinuous_prod_of_ScottContinuous`: `f` is Scott continuous on a product space if it is Scott continuous in each variable - `ScottContinuousOn.inf₂`: For complete linear orders, the meet operation is Scott continuous --- - [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 - [x] depends on: #21493 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-order	78/5	Mathlib/Order/ScottContinuity.lean	1	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	10-82102 10 days ago	unknown	unknown
25170	eric-wieser author:eric-wieser	refactor: make basis computable	I claim that in the long run, `Basis.repr` should be a `DFinsupp` not `Finsupp`, so that it is computable. To make this change incrementally, we can store a `DFinsupp` internally today, and keep `repr` and `ofRepr` working with finsupp. This at least would allow building a large basis object, and then using `repr'` to compute with it. The cost of this intermediate state is a loss of many defeqs. --- - [ ] depends on: #25166 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	66/21	Mathlib/LinearAlgebra/Basis/Basic.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	10-73673 10 days ago	11-38671 11 days ago	0-0 0 seconds
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	27	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'michaellee94', 'winstonyin']	grunweg assignee:grunweg	10-44673 10 days ago	10-48602 10 days ago	77-37721 77 days
25062	erdOne author:erdOne	feat(Algebra/MvPolynomial): nilpotents and units	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	113/0	Mathlib.lean,Mathlib/Algebra/MvPolynomial/Nilpotent.lean,Mathlib/Data/Finsupp/Basic.lean	3	8	['alreadydone', 'erdOne', 'eric-wieser', 'github-actions']	nobody	10-22453 10 days ago	19-70059 19 days ago	19-70108 19 days
24689	chrisflav author:chrisflav	feat(Topology): compact open covered sets	This is used to define the fpqc topology for schemes. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-algebraic-geometry t-topology	219/0	Mathlib.lean,Mathlib/Data/Set/Sigma.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Sets/CompactOpenCovered.lean,Mathlib/Topology/Sets/Opens.lean,Mathlib/Topology/Spectral/Prespectral.lean	6	5	['chrisflav', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant']	nobody	10-5014 10 days ago	10-5399 10 days ago	31-65140 31 days
25313	jt496 author:jt496	feat(SimpleGraph/FiveWheelLike): add the Andrásfai-Erdős-Sós theorem	Add the Andrásfai-Erdős-Sós theorem `colorable_of_cliqueFree_lt_minDegree` which says that an `r + 1`-cliquefree graph `G` with sufficiently large minimum degree is `r`-colorable. Co-authored-by: Lian Bremner Tattersall --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-combinatorics	307/4	Mathlib/Combinatorics/SimpleGraph/FiveWheelLike.lean	1	1	['github-actions']	nobody	9-73651 9 days ago	10-35687 10 days ago	10-35738 10 days
25324	eric-wieser author:eric-wieser	feat: more functorial results about DFinsupp	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) [#mathlib4 > Equiv.cast for structures @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Equiv.2Ecast.20for.20structures/near/521390935)	WIP	140/15	Mathlib/Data/DFinsupp/Defs.lean,Mathlib/LinearAlgebra/DFinsupp.lean	2	1	['github-actions']	nobody	9-69236 9 days ago	9-69769 9 days ago	0-0 0 seconds
21950	erdOne author:erdOne	feat(NumberTheory/Padics): the completion of `ℚ` at a finite place is `ℚ_[p]`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	253/1	Mathlib.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroMulInt.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	7	22	['Ruben-VandeVelde', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky', 'smmercuri', 'xroblot']	nobody	9-68894 9 days ago	9-68894 9 days ago	51-21490 51 days
25322	thorimur author:thorimur	style: use simplex notation (`⦋n⦌`) where possible	`StandardSimplex.mk n` is replaced with `⦋n⦌` where possible (except in notation and macros, which are left untouched). This includes opening `Simplicial` in two files. Also, outdated and unused `local notation` `[n]` for `StandardSimplex.mk n` is removed. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	38/39	Mathlib/AlgebraicTopology/CechNerve.lean,Mathlib/AlgebraicTopology/MooreComplex.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Coskeletal.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean	7	1	['github-actions']	nobody	9-65931 9 days ago	9-76510 9 days ago	9-76563 9 days
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) --- - [ ] depends on: #23181 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	50/1	Mathlib/Topology/Bases.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Defs.lean	3	4	['ADedecker', 'Komyyy', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	9-64807 9 days ago	51-17122 1 month ago	0-82106 22 hours
25288	robertmaxton42 author:robertmaxton42	feat(CategoryTheory): generalize `Discrete` to arbitrary morphism levels	Using an unused `let`, add an 'anchor' to the definition of `Discrete`, allowing it to carry a second universe level that is then used to permit discrete categories to live in any `Cat.{v, u}`. (This trick was borrowed from the code of `ULiftHom`.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	38/32	Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Discrete/Basic.lean,Mathlib/CategoryTheory/IsConnected.lean	3	2	['github-actions', 'joelriou']	nobody	9-43233 9 days ago	9-81773 9 days ago	0-0 0 seconds
24373	YaelDillies author:YaelDillies	refactor: golf `modularCharacter`	... using the lessons learned from `distribHaarChar`. Unfortunately, the two setups can't quite be unified because we are lacking an additive version of `MulDistribMulAction`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-CI	82/48	Mathlib/MeasureTheory/Group/MeasurableEquiv.lean,Mathlib/MeasureTheory/Group/Measure.lean,Mathlib/MeasureTheory/Group/ModularCharacter.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean	5	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	9-42364 9 days ago	9-42388 9 days ago	0-0 0 seconds
24490	dagurtomas author:dagurtomas	feat(CategoryTheory): transport symmetric monoidal structure along equivalence	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	89/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Braided/Transport.lean	3	6	['dagurtomas', 'github-actions', 'joelriou', 'kckennylau', 'leanprover-community-bot-assistant']	nobody	9-30633 9 days ago	9-30693 9 days ago	21-74160 21 days
24439	mariainesdff author:mariainesdff	feat(Data/Nat/Factorial/NatCast): add natCast_factorial_of_isNilpotent	Co-authored-by: @AntoineChambert-Loir. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra delegated label:t-algebra$	32/2	Mathlib/Data/Nat/Factorial/NatCast.lean	1	3	['b-mehta', 'github-actions', 'mariainesdff']	ocfnash assignee:ocfnash	9-21321 9 days ago	41-27829 1 month ago	42-15186 42 days
25315	ocfnash author:ocfnash	feat: add `simp` to lemma `Fin.coe_ofNat_eq_mod`	One consequence is that `simp` can now prove things like this: ```lean example : (3 : Fin 10).val = 3 := by simp example : (4 : Fin 10).val = 4 := by simp example : (5 : Fin 10).val = 5 := by simp ``` previously this only this only worked up to `(2 : Fin 10).val = 2` (via lemmas like `Fin.val_two`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	32/28	Archive/Imo/Imo2024Q5.lean,Mathlib/AlgebraicTopology/DoldKan/Faces.lean,Mathlib/Analysis/CStarAlgebra/SpecialFunctions/PosPart.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Parity.lean,Mathlib/Data/Fin/Rev.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/GroupTheory/Perm/Fin.lean,Mathlib/RingTheory/ChainOfDivisors.lean,MathlibTest/matrix.lean	10	25	['b-mehta', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mattrobball', 'ocfnash']	nobody	9-18565 9 days ago	10-11743 10 days ago	10-11733 10 days
25267	YaelDillies author:YaelDillies	feat: `counit (antipode a) = counit a`	and unsimp `sum_antipode_mul_eq_algebraMap_counit`/`sum_mul_antipode_eq_algebraMap_counit` since they are annoying lemmas to fight against. From Toric Co-authored-by: Patrick Massot --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	51/18	Mathlib/RingTheory/Coalgebra/Basic.lean,Mathlib/RingTheory/HopfAlgebra/Basic.lean,Mathlib/RingTheory/HopfAlgebra/MonoidAlgebra.lean	3	9	['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	9-11474 9 days ago	9-11493 9 days ago	12-10225 12 days
25284	alreadydone author:alreadydone	feat(LinearAlgebra/Contraction): bijectivity of `dualTensorHom` + generalize to CommSemiring	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	168/44	Mathlib/Data/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/LinearAlgebra/Trace.lean,Mathlib/RingTheory/Finiteness/Finsupp.lean	5	5	['alreadydone', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	8-77320 8 days ago	11-79692 11 days ago	11-79677 11 days
25078	loefflerd author:loefflerd	feat(NumberTheory/ModularForms): GL(2, R) action preserves holomorphy	Show that the slash action of negative-determinant matrices preserves holomorphic functions. --- - [x] depends on: #25028 - [x] depends on: #24740 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	58/19	Mathlib/Analysis/Complex/UpperHalfPlane/Manifold.lean,Mathlib/NumberTheory/ModularForms/Basic.lean	2	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	8-38192 8 days ago	11-30057 11 days ago	11-30259 11 days
25343	plp127 author:plp127	docs(Topology/Perfect): Mention dense-in-itself	The file `Mathlib/Topology/Perfect` defines a "nonstandard" predicate `Preperfect C` to mean that every point of `C` is an accumulation point of `C`. This property already has a name, it is called [dense-in-itself](https://en.wikipedia.org/wiki/Dense-in-itself). This PR adds this name to the docs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology documentation	7/7	Mathlib/Topology/Perfect.lean	1	1	['github-actions']	nobody	8-27307 8 days ago	8-27385 8 days ago	8-27370 8 days
24777	joelriou author:joelriou	feat(CategoryTheory): abstract argument for the stability under transfinite compositions	If a class of morphisms is multiplicative, respects isomorphisms and is stable under filtered colimits, then it is stable under transfinite compositions. (This simplifies the proof in the case of monomorphisms in Grothendieck abelian categories, for isomorphisms, and in #23282, we shall apply this to monomorphisms in `Type`.) --- - [x] depends on: #24773 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory	122/116	Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/Colim.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/EnoughInjectives.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/Monomorphisms.lean,Mathlib/CategoryTheory/MorphismProperty/Limits.lean,Mathlib/CategoryTheory/MorphismProperty/TransfiniteComposition.lean	5	12	['callesonne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	8-11882 8 days ago	9-4698 9 days ago	21-28102 21 days
25140	wwylele author:wwylele	feat: Hahn embedding theorem	This proves [Hahn embedding theorem](https://en.wikipedia.org/wiki/Hahn_embedding_theorem), one among the 1000+ theorems project. This is still in early draft, which is why I put it in a throw-away folder. I'll gradually clean up code, put them to the right places, and PR small components. The proof roughly follows the ones in the following literature - Hausner, M.; Wendel, J.G. (1952), "Ordered vector spaces", Proceedings of the American Mathematical Society, 3 (6): 977–982, [doi](https://en.wikipedia.org/wiki/Doi_(identifier)):[10.1090/S0002-9939-1952-0052045-1](https://doi.org/10.1090%2FS0002-9939-1952-0052045-1) - Clifford, A.H. (1954), "Note on Hahn's Theorem on Ordered Abelian Groups", Proceedings of the American Mathematical Society, 5 (6): 860–863, [doi](https://en.wikipedia.org/wiki/Doi_(identifier)):[10.2307/2032549](https://doi.org/10.2307%2F2032549), [JSTOR](https://en.wikipedia.org/wiki/JSTOR_(identifier)) [2032549](https://www.jstor.org/stable/2032549) --- - [ ] depends on: #25190 - [ ] depends on: #25168 - [ ] depends on: #25157 - [ ] depends on: #25144 - [ ] depends on: #25338 - [ ] depends on: #25348 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR WIP	3395/0	Mathlib/HahnEmbedding/ArchimedeanClass.lean,Mathlib/HahnEmbedding/ArchimedeanSubgroup.lean,Mathlib/HahnEmbedding/Divisible.lean,Mathlib/HahnEmbedding/Hahn.lean,Mathlib/HahnEmbedding/LinearPMap.lean,Mathlib/HahnEmbedding/Main.lean,Mathlib/HahnEmbedding/Misc.lean,Mathlib/HahnEmbedding/RealEmbed.lean,docs/1000.yaml	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	8-8366 8 days ago	15-15816 15 days ago	0-0 0 seconds
24514	b-mehta author:b-mehta	chore(Int/GCD): use fuel in xgcd	Modify the definition of xgcd to use fuel recursion, to allow it to be reduced in the kernel. As a consequence, this means the evaluation of field operations in ZMod p become provable by `rfl` and `decide`. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/opaque.20recursion.20definitions.20break.20mergeSort.20decidability --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	44/22	Mathlib/Data/Int/GCD.lean	1	4	['b-mehta', 'eric-wieser', 'github-actions', 'nomeata', 'urkud']	nobody	7-84218 7 days ago	39-19437 1 month ago	39-19489 39 days
24543	pfaffelh author:pfaffelh	feat (Topology/Compactness/CompactSystem): Set system of finite unions of sets in a compact system is again a compact system	feat (Topology/Compactness/CompactSystem): The set system of finite unions of sets in a compact system is a compact system A compact system is a set system with the following property: If all finite intersections of a sequence in the set system is non-empty, the countable intersection is not empty. Starting with a compact system, consider the finite unions of sets in the copact system. Such sets again form a compact system (`IsCompactSystem.union.isCompactSystem`). --- - [x] depends on: #24541 - [x] depends on: #24542 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology blocked-by-other-PR	431/2	Mathlib/Topology/Compactness/CompactSystem.lean	1	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	7-82487 7 days ago	7-82487 7 days ago	0-1830 30 minutes
25337	alreadydone author:alreadydone	feat(RingTheory): invertible modules and Picard group	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	535/0	Mathlib.lean,Mathlib/RingTheory/Finiteness/Cardinality.lean,Mathlib/RingTheory/PicardGroup.lean,docs/references.bib	4	37	['alreadydone', 'erdOne', 'github-actions', 'kckennylau']	nobody	7-62144 7 days ago	8-71866 8 days ago	8-71857 8 days
24065	kim-em author:kim-em	chore: script to give topological sort of modules	This script is not useful by itself: it just gives a topological sort of Mathlib's import graph. But I've several times found it useful when I want to modify many files systematically with minimal rebuilding: just work backwards through the list.	awaiting-author	96/0	scripts/README.md,scripts/topological_sort.py	2	5	['github-actions', 'jcommelin', 'kim-em']	jcommelin assignee:jcommelin	7-49448 7 days ago	7-49448 7 days ago	48-7769 48 days
24320	robin-carlier author:robin-carlier	chore(Category/Theory/Whiskering): tag `[reassoc]` some lemmas about isoWhisker	Using the extension of `reassoc` to equality of isomorphisms, tags some lemmas in `CategoryTheory.Whiskering` with this new version of the attribute. --- - [ ] depends on: #24303 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	179/11	Mathlib.lean,Mathlib/CategoryTheory/Whiskering.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/IsoReassoc.lean,Mathlib/Tactic/CategoryTheory/Reassoc.lean,MathlibTest/CategoryTheory/Reassoc.lean	6	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	7-47673 7 days ago	7-47694 7 days ago	7-52796 7 days
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	209/2	Mathlib.lean,Mathlib/MeasureTheory/Measure/Decomposition/Hahn.lean,Mathlib/MeasureTheory/Measure/Sub.lean,Mathlib/MeasureTheory/VectorMeasure/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Decomposition/JordanSub.lean	5	132	['DavidLedvinka', 'DrLSimon', 'EtienneC30', 'github-actions', 'grunweg', 'urkud']	EtienneC30 assignee:EtienneC30	7-44161 7 days ago	7-44161 7 days ago	29-62586 29 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	378/0	Archive.lean,Archive/Imo/Imo2020Q6.lean	2	2	['github-actions', 'jsm28']	nobody	7-36807 7 days ago	72-26314 2 months ago	0-0 0 seconds
25327	YaelDillies author:YaelDillies	feat: `F.obj M` is a commutative monoid object if `M` is	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric	11/3	Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean	2	1	['github-actions']	nobody	7-35334 7 days ago	9-34472 9 days ago	9-34465 9 days
24614	JovanGerb author:JovanGerb	chore: rename field `inf` to `min` in `Lattice`	As suggested by @eric-wieser, this PR renames the `sup` and `inf` fields in `Lattice` to `max` and `min`. This means that we now can extend `Lattice` and `LinearOrder` simultaneously without ending up with duplicate fields. This should be implemented in a future PR for existing classes like `CompleteLinearOrder`. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60sup.60.2F.60inf.60.20or.20.60max.60.2F.60min.60.20for.20set.20interval.20lemmas.3F) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	179/185	Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Ring/Idempotent.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Tropical/Lattice.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/Convex/SimplicialComplex/Basic.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/NormedSpace/ENormedSpace.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/CategoryTheory/Groupoid/Subgroupoid.lean,Mathlib/CategoryTheory/Sites/Coverage.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/CategoryTheory/Sites/Sieves.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/CategoryTheory/Subpresheaf/Basic.lean,Mathlib/Combinatorics/Digraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Computability/Reduce.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Multiset/UnionInter.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/PEquiv.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Semiquot.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Sum/Lattice.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/Geometry/Convex/Cone/Basic.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/ModelTheory/Substructures.lean,Mathlib/Order/BooleanSubalgebra.lean,Mathlib/Order/Booleanisation.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/Concept.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/Copy.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/FixedPoints.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Hom/Order.lean,Mathlib/Order/Ideal.lean,Mathlib/Order/Interval/Basic.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/Partition/Finpartition.lean,Mathlib/Order/PropInstances.lean,Mathlib/Order/Sublattice.lean,Mathlib/Order/WithBot.lean,Mathlib/Probability/Process/Filtration.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Finiteness/Small.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/TwoSidedIdeal/Lattice.lean,Mathlib/RingTheory/UniqueFactorizationDomain/FactorSet.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/Group/GroupTopology.lean,Mathlib/Topology/Category/TopCat/OpenNhds.lean,Mathlib/Topology/LocallyFinsupp.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/UniformSpace/Basic.lean	82	13	['JovanGerb', 'bryangingechen', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	nobody	7-31740 7 days ago	7-39051 7 days ago	1-85670 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$	30/0	Mathlib/LinearAlgebra/Span/Basic.lean	1	21	['Paul-Lez', 'Raph-DG', 'github-actions', 'j-loreaux', 'mattrobball']	mattrobball assignee:mattrobball	7-31078 7 days ago	7-31078 7 days ago	109-70769 109 days
25358	YaelDillies author:YaelDillies	chore: more shortcut instances for `ℤ`	Currently, some of those instances are inferred from `Int.instNormedCommRing : NormedCommRing ℤ` once one imports `Mathlib.Analysis.Normed.Ring.Lemmas`. Among other things, this confuses `#min_imports`, which then invariably reports that `Mathlib.Analysis.Normed.Ring.Lemmas` is used. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra easy label:t-algebra$	16/5	Mathlib/Algebra/Ring/Int/Defs.lean,Mathlib/NumberTheory/LegendreSymbol/GaussEisensteinLemmas.lean,Mathlib/NumberTheory/Zsqrtd/QuadraticReciprocity.lean	3	4	['eric-wieser', 'github-actions', 'leanprover-bot']	nobody	7-29639 7 days ago	7-38392 7 days ago	7-39164 7 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 awaiting-author	250/3	Mathlib/NumberTheory/SelbergSieve.lean	1	18	['AlexKontorovich', 'Ruben-VandeVelde', 'github-actions', 'grunweg', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	7-25818 7 days ago	7-25818 7 days ago	61-33984 61 days
5897	eric-wieser author:eric-wieser	feat: add a `MonadError` instance for `ContT`	We already have a `MonadExcept` instance; this promotes it to `MonadError`. Note the issue with the existing `MonadExcept` instance still applies. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	16/0	Mathlib/Control/Monad/Cont.lean	1	21	['Vierkantor', 'YaelDillies', 'eric-wieser', 'github-actions', 'kmill']	nobody	6-70661 6 days ago	326-52157 10 months ago	339-53816 339 days
25383	sgouezel author:sgouezel	feat: continuity statements for the bundle of continuous linear maps	The continuity statements I am adding are counterparts of already existing ones for smooth maps. Also solve a TODO by dropping the type synonym `Bundle.ContinuousLinearMap`. It was useful a long time ago when the topology on the fibers was built using the norm on the model space. This is not the case since we've endowed all spaces of continuous linear maps on topological vector spaces with the topology of uniform convergence on bounded sets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	274/29	Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Data/Bundle.lean,Mathlib/Geometry/Manifold/VectorBundle/Hom.lean,Mathlib/Topology/VectorBundle/Hom.lean	4	1	['github-actions']	nobody	6-46150 6 days ago	6-46371 6 days ago	6-46356 6 days
25186	riccardobrasca author:riccardobrasca	feat: add `isPrincipalIdealRing_of_isPrincipal_of_lt_or_isPrincipal_of_mem_primesOver_of_mem_Icc`	The standard technique to prove that `𝓞 K` is principal in the Galois case. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	45/9	Mathlib/NumberTheory/NumberField/ClassNumber.lean	1	14	['faenuccio', 'github-actions', 'riccardobrasca']	nobody	6-37000 6 days ago	15-29033 15 days ago	15-29036 15 days
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. --- - [x] depends on: #23386 - [x] depends on: #23962 - [x] depends on: #24107 - [x] depends on: #24117 - [x] depends on: #24167 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	449/4	Mathlib.lean,Mathlib/Algebra/Group/End.lean,Mathlib/GroupTheory/GroupAction/FixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean	6	29	['github-actions', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	6-35345 6 days ago	6-35345 6 days ago	13-15466 13 days
24480	mariainesdff author:mariainesdff	feat(RingTheory/DividedPowers/SubPDIdeal): add SubDPIdeal	Let `A` be a commutative (semi)ring and let `I` be an ideal of `A` with a divided power structure `hI`. A subideal `J` of `I` is a sub-dp-ideal of `(I, hI)` if, for all `n ∈ ℕ > 0` and all `x ∈ J`, `hI.dpow n x ∈ J`. The "TODOs" listed on the file docstring have been formalized by the authors and will be added in subsequent PRs. Co-authored-by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory ready-to-merge delegated label:t-algebra$	373/0	Mathlib.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/RingTheory/Ideal/Span.lean	3	20	['AntoineChambert-Loir', 'github-actions', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	6-35277 6 days ago	6-36888 6 days ago	33-65896 33 days
25235	ADedecker author:ADedecker	feat: unit space of a (locally) compact T1 monoid is (locally) compact	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology	50/0	Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Group/Basic.lean	2	2	['ADedecker', 'github-actions']	nobody	6-24085 6 days ago	13-30528 13 days ago	13-30513 13 days
25020	erdOne author:erdOne	feat: define `continuousCohomology`	Co-authored-by: Richard Hill --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	244/1	Mathlib.lean,Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Homology/Embedding/Restriction.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Zero.lean	5	16	['erdOne', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'rmhi']	nobody	6-20226 6 days ago	6-20243 6 days ago	20-22547 20 days
24884	smmercuri author:smmercuri	feat: `ramificationIdx` for `NumberField.InfinitePlace`	--- - [x] depends on: #24880 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	38/0	Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	nobody	6-19398 6 days ago	21-24116 21 days ago	21-24464 21 days
25119	grunweg author:grunweg	chore: make `finiteness` a default tactic	--- Opening for discussion - [x] depends on: #25111 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	423/366	Archive/Wiedijk100Theorems/BallotProblem.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Asymptotics/ExpGrowth.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Convex/Integral.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Analysis/Fourier/AddCircleMulti.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Holder.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENNReal/Real.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/InformationTheory/KullbackLeibler/Basic.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Egorov.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/L1Space/AEEqFun.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/ChebyshevMarkov.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Defs.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Complete.lean,Mathlib/MeasureTheory/Function/LpSpace/Indicator.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/Prod.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean,Mathlib/MeasureTheory/Measure/Decomposition/IntegralRNDeriv.lean,Mathlib/MeasureTheory/Measure/Decomposition/Lebesgue.lean,Mathlib/MeasureTheory/Measure/Haar/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar.lean,Mathlib/MeasureTheory/Measure/Haar/Quotient.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/MeasureTheory/Measure/Real.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/Tilted.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Finite.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/Probability/BorelCantelli.lean,Mathlib/Probability/Independence/Conditional.lean,Mathlib/Probability/Integration.lean,Mathlib/Probability/Kernel/Composition/IntegralCompProd.lean,Mathlib/Probability/Kernel/Disintegration/CondCDF.lean,Mathlib/Probability/Kernel/Disintegration/Density.lean,Mathlib/Probability/Martingale/Convergence.lean,Mathlib/Probability/Martingale/OptionalStopping.lean,Mathlib/Probability/Moments/CovarianceBilin.lean,Mathlib/Probability/Moments/Tilted.lean,Mathlib/Probability/Moments/Variance.lean,Mathlib/Probability/UniformOn.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/Perfect.lean,scripts/noshake.json	73	7	['github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'sgouezel']	nobody	6-19158 6 days ago	6-31052 6 days ago	6-62051 6 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']	PatrickMassot assignee:PatrickMassot	6-18915 6 days ago	82-35471 2 months ago	82-37366 82 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	7	['Paul-Lez', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'ocfnash', 'xyzw12345']	ocfnash assignee:ocfnash	6-18655 6 days ago	68-51515 2 months ago	69-83302 69 days
25406	grunweg author:grunweg	chore(Linter/DirectoryDependency): move forbidden directories into a JSON file	more precisely, to a JSON file with comments: we strip any line beginning with (some whitespace and) the string "// ". Details are up for discussion, such as whether to use toml instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter	373/306	Mathlib/Tactic/Linter/DirectoryDependency.lean,scripts/README.md,scripts/forbiddenDirs.json	3	2	['github-actions', 'grunweg']	nobody	6-845 6 days ago	6-7898 6 days ago	6-7949 6 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	118/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented.lean	2	5	['github-actions', 'joelriou', 'robin-carlier']	joelriou assignee:joelriou	5-81078 5 days ago	20-23280 20 days ago	90-81566 90 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	560/0	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	12	['erdOne', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	erdOne assignee:erdOne	5-80608 5 days ago	27-51275 27 days ago	0-33 33 seconds
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	26	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'lecopivo', 'peabrainiac']	fpvandoorn and grunweg assignee:fpvandoorn assignee:grunweg	5-65792 5 days ago	5-67528 5 days ago	67-59612 67 days
25323	Multramate author:Multramate	feat(RingTheory/Ideal/Span): add pair lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	131/31	Mathlib/Algebra/Module/PID.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Span.lean	5	8	['Multramate', 'eric-wieser', 'github-actions', 'tb65536']	nobody	5-62470 5 days ago	6-76417 6 days ago	6-76401 6 days
24448	Hagb author:Hagb	feat(RingTheory/Ideal/Span): some lemmas about zero and span	`simp` would be able to solve them. Notice that `span_singleton_zero : span {(0 : R)} = ⊥` itself can be solved by `simp` without this commit, which uses `span_singleton_eq_bot : span ({x} : Set α) = ⊥ ↔ x = 0`, while `simp` cannot solve goals like `f (Ideal.span {(0 : R)}) = f ⊥`, which would be solvable by `simp` with `span_singleton_zero` marked with `@[simp]`. Without adding also `Ideal.dvd_bot`, these lemmas on `Span.lean` would make the following failed, since `simp` would rewrite `{0}` with `⊥` and result in a goal `v.asIdeal ∣ ⊥` that it can't solve. https://github.com/leanprover-community/mathlib4/blob/3f2556372f27171259a381d4d57db71440700cd8/Mathlib/RingTheory/DedekindDomain/AdicValuation.lean#L123 --- [![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$	16/1	Mathlib/Algebra/Module/PID.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Span.lean	3	6	['Hagb', 'github-actions', 'tb65536']	chrisflav assignee:chrisflav	5-62465 5 days ago	9-18585 9 days ago	32-8893 32 days
24754	urkud author:urkud	feat: define `pathIntegral`	This is a step towards formalizing of the Poincaré lemma for 1-forms. --- - [x] depends on: #24831 - [x] depends on: #25047 - [x] depends on: #25048 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	552/8	Mathlib.lean,Mathlib/Analysis/Convex/PathConnected.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/PathIntegral/Basic.lean	5	23	['github-actions', 'mathlib4-dependent-issues-bot', 'sgouezel', 'urkud']	nobody	5-56092 5 days ago	15-35077 15 days ago	8-52615 8 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. --- - [x] depends on: #23725 - [x] depends on: #23726 - [ ] depends on: #24435	large-import t-algebra blocked-by-other-PR WIP label:t-algebra$	68/26	Mathlib/RingTheory/Valuation/Discrete/Basic.lean	1	31	['faenuccio', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'pechersky', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	5-46894 5 days ago	5-46896 5 days ago	35-67955 35 days
20238	maemre author:maemre	feat(Computability/DFA): Closure of regular languages under some set operations	This shows that regular languages are closed under complement and intersection by constructing DFAs for them. --- Closure under all other operations will be proved when someone adds the proof for DFA<->regular expression equivalence, so they are not part of this PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor awaiting-author	159/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	59	['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'meithecatte', 'urkud']	EtienneC30 assignee:EtienneC30	5-43676 5 days ago	34-77815 1 month ago	48-67492 48 days
25236	adomani author:adomani	feat: the empty line in commands linter	This linter flags empty lines within a command. It allows empty lines within doc-strings, module-docs and a couple of other "sensible" places. It also skips files that are likely to contain meta-code, since there the use of empty lines in definition is more widespread. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter maintainer-merge	373/11	Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/NormalMono/Equalizers.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/EmptyLine.lean,MathlibTest/EmptyLine.lean	7	23	['adomani', 'bryangingechen', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	5-39042 5 days ago	6-23622 6 days ago	13-20830 13 days
25364	Paul-Lez author:Paul-Lez	feat(Analysis/SpecialFunction/NthRoot): definition and basic API of Real.nthRoot	Co-authored-by: Eric Wieser --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	256/0	Mathlib/Analysis/SpecialFunctions/NthRoot.lean,Mathlib/Data/Sign.lean	2	16	['eric-wieser', 'fpvandoorn', 'github-actions', 'j-loreaux', 'madvorak']	nobody	5-35397 5 days ago	7-23524 7 days ago	0-42 42 seconds
24875	smmercuri author:smmercuri	feat: injectivity of `InfinitePlace.embedding`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	19/0	Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean	1	6	['Ruben-VandeVelde', 'github-actions', 'riccardobrasca', 'smmercuri', 'xroblot']	nobody	5-34998 5 days ago	26-48588 26 days ago	26-48642 26 days
25425	Paul-Lez author:Paul-Lez	feat(LinearAlgebra/Basis/HasCanonicalBasis): propose `HasCanonicalBasis` class	Context: in some cases, e.g. writing down PDEs, having a notion of partial derivatives can be useful. In an ideal world (as mentioned by @ocfnash in [this Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Partial.20derivatives/with/463936246)), one could write something along the lines of `open scoped PartialDerivatives` in order to access nice notation for this. This PR introduces a notion of a canonical basis for a module in order to allow taking partial derivatives with respect to it. A later PR (which I am about open) would then propose a notation for taking partial derivatives (defined using `lineDeriv` in order to avoid requiring Frechet-differentiability assumptions). The goal here is to have notation that works equally well on e.g. `𝕜 × 𝕜` and `EuclideanSpace 𝕜 (Fin 2)` and so on. I've opened this PR as a draft in order to get some initial feedback on the content (and whether this is considered appropriate for Mathlib!); the file itself would need to be split (e.g. the instances defined should probably go in different files) Co-authored-by: Eric Wieser --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		105/0	Mathlib.lean,Mathlib/LinearAlgebra/Basis/HasCanonicalBasis.lean	2	1	['github-actions']	nobody	5-33265 5 days ago	5-37706 5 days ago	0-0 0 seconds
25410	JovanGerb author:JovanGerb	chore: remove some duplicate instances	I have a program that finds duplicate instances, as described at [#mathlib4 > duplicate declarations](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/duplicate.20declarations/with/518941841) This PR is a start at fixing these in Mathlib. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		30/131	Mathlib/Algebra/Category/Grp/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Algebra/Homology/Embedding/IsSupported.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Ring/Divisibility/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/CategoryTheory/Countable.lean,Mathlib/CategoryTheory/EffectiveEpi/Preserves.lean,Mathlib/CategoryTheory/ObjectProperty/FullSubcategory.lean,Mathlib/Computability/TuringDegree.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Fintype/EquivFin.lean,Mathlib/Data/List/TakeDrop.lean,Mathlib/Data/Matroid/Constructions.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Option/Defs.lean,Mathlib/Data/Ordering/Basic.lean,Mathlib/Data/Sign.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/GroupTheory/Solvable.lean,Mathlib/Logic/Embedding/Basic.lean,Mathlib/Logic/Equiv/Fin/Basic.lean,Mathlib/ModelTheory/Basic.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/Tactic/Polyrith.lean,Mathlib/Topology/Compactness/Lindelof.lean	30	9	['JovanGerb', 'adomani', 'eric-wieser', 'github-actions']	nobody	5-31422 5 days ago	5-77075 5 days ago	5-77059 5 days
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 delegated	8/0	Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean	1	6	['ADedecker', 'eric-wieser', 'github-actions', 'j-loreaux', 'mathlib-bors']	nobody	5-28956 5 days ago	14-16303 14 days ago	0-18788 5 hours
25429	Paul-Lez author:Paul-Lez	feat(Analysis/PDE/Quasilinear/Defs): Add definitions about quasilinear first order PDEs	This PR introduces some basic definitions related to first order quasilinear PDEs. In a subsequent PR (I'm currently cleaning up the code), these will be used to state and prove some results about how solutions to quasilinear PDEs vary along characteristic curves. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	141/0	Mathlib.lean,Mathlib/Analysis/PDE/Quasilinear/Defs.lean	2	1	['github-actions']	nobody	5-25161 5 days ago	5-33331 5 days ago	0-0 0 seconds
25422	xroblot author:xroblot	feat(NumberField): Image of torsion modulo an ideal	Let `I` be an integral ideal of a number field `K`. We define the morphism from the torsion of `K` to `(𝓞 K ⧸ I)ˣ` and prove that it is injective if the norm of `I` is coprime with the order of the torsion of `K`. As a consequence, we prove that for a prime ideal `P` coprime with the order of the torsion of `K`, the norm of `P` is congruent to `1` modulo `torsionOrder K`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	202/1	Mathlib.lean,Mathlib/NumberTheory/Cyclotomic/Basic.lean,Mathlib/NumberTheory/Cyclotomic/Rat.lean,Mathlib/NumberTheory/NumberField/Ideal/Basic.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean	5	1	['github-actions']	nobody	5-20931 5 days ago	5-21476 5 days ago	5-21470 5 days
25441	kebekus author:kebekus	feat: introduce the Laplace operator	Introduce the Laplace operator for functions on real, finite-dimensional, inner product spaces. 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	197/0	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/InnerProductSpace/Laplace.lean	4	1	['github-actions']	nobody	5-16852 5 days ago	5-16852 5 days ago	5-16930 5 days
25351	kckennylau author:kckennylau	feat(CategoryTheory): add API and functoriality for Skeleton	--- The `Functor` stuff is really the main content. The `API` stuff is a bit experimental and I don't really know if it's the best approach to do things. I could also make the `API` more functorial, maybe. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	51/3	Mathlib/CategoryTheory/Skeletal.lean	1	9	['github-actions', 'joelriou', 'leanprover-community-bot-assistant']	nobody	5-16373 5 days ago	5-16373 5 days ago	1-39767 1 day
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	11	['bjoernkjoshanssen', 'github-actions', 'leanprover-community-bot-assistant', 'ocfnash']	nobody	5-16176 5 days ago	5-16176 5 days ago	3-38897 3 days
24959	dupuisf author:dupuisf	feat: the CFC commutes with set integrals	This PR shows various versions of `cfc (fun r => ∫ x in s, f x r ∂μ) a = ∫ x in s, cfc (f x) a ∂μ`. We previously had it for integrals over the whole space (i.e. without `s`), but the set version turns out to be very convenient. Lemmas showing the integrability of `fun x => cfc (f x) a` and friends are also added. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability t-analysis awaiting-author	377/65	Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean	1	23	['ADedecker', 'dupuisf', 'github-actions', 'j-loreaux']	nobody	5-12489 5 days ago	12-79612 12 days ago	11-4964 11 days
25139	kckennylau author:kckennylau	feat(RingTheory): basis for `Polynomial.degreeLT`	Linear algebra results about the module `R[x]_n` of polynomials with degree `< n`. Co-authored-by: Anne Baanen --- - [x] depends on: #25270 Used in a future resultant PR from branch [kckennylau/resultant](https://github.com/leanprover-community/mathlib4/tree/kckennylau/resultant). This file is split from that branch because there are already over 1000 lines of code. [![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$	195/2	Mathlib.lean,Mathlib/Algebra/Polynomial/Taylor.lean,Mathlib/RingTheory/Polynomial/DegreeLT.lean	3	108	['YaelDillies', 'erdOne', 'github-actions', 'kbuzzard', 'kckennylau', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	5-9619 5 days ago	5-43801 5 days ago	4-17234 4 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 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 n H / n.choose 2` as `n` approaches `∞` exists, - `extremalNumber n H` is asymptotically equivalent to `turanDensity H * n.choose 2` as `n` approaches `∞`. --- - [x] depends on: #19865 - [x] depends on: #20681 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics awaiting-author	210/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/TuranDensity.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/Order/Monotone/Basic.lean	6	18	['b-mehta', 'github-actions', 'mathlib4-dependent-issues-bot', 'mitchell-horner']	b-mehta assignee:b-mehta	5-8460 5 days ago	5-18260 5 days ago	21-70934 21 days
25407	adomani author:adomani	feat: check that the mathlib options exist	This PR adds a simple check that all the options mentioned in `mathlibStandardSet` exist (at least, the ones that do exist!). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge	18/0	Mathlib/Init.lean	1	5	['adomani', 'github-actions', 'grunweg']	nobody	4-85198 4 days ago	4-85198 4 days ago	5-82859 5 days
25401	digama0 author:digama0	feat(Util): SuppressSorry option	See also leanprover/lean4#8611 and [#lean4 > Silent sorry @ 💬](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Silent.20sorry/near/503537964). This is a stop-gap solution while leanprover/lean4#8611 is underway, but it works about as well as any other built in option. Hooking declaration elaborators turns out to be a very powerful technique. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	342/0	Mathlib.lean,Mathlib/Util/CommandElabHook.lean,Mathlib/Util/SuppressSorry.lean,MathlibTest/suppressSorry.lean	4	13	['digama0', 'eric-wieser', 'github-actions']	nobody	4-68137 4 days ago	5-6071 5 days ago	6-16421 6 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$	62/0	Mathlib.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/RingTheory/Regular/Category.lean	3	36	['Thmoas-Guan', 'erdOne', 'github-actions', 'joelriou', 'riccardobrasca']	joelriou assignee:joelriou	4-54006 4 days ago	17-33074 17 days ago	49-76048 49 days
25259	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): associated primes of localized module	We proved the `Ass(S^{-1}M)` is equal to the preimage of `Ass(M)` under `Ideal.comap` when over noetherian ring. From this we proved that every minimal primes over `Module.annihilator R M` is in `Ass(M)` when `M` is finitely generated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	70/11	Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean	1	6	['Thmoas-Guan', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant']	nobody	4-53977 4 days ago	11-30057 11 days ago	12-23956 12 days
25213	mbkybky author:mbkybky	feat(RingTheory/KrullDimension): Krull Dimension of quotient regular sequence	We show that if `M` is a finite module over a Noetherian local ring `R`, `[r₁, …, rₙ]` is an `M`-sequence, then `dim M⧸(r₁, …, rₙ)M + n = dim M`. Co-authored-by: Nailin Guan @Thmoas-Guan - [x] depends on: #24771 - [x] depends on: #25210 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	241/24	Mathlib.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Spectrum/Prime/LTSeries.lean,Mathlib/RingTheory/Support.lean	9	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	4-53955 4 days ago	unknown	unknown
24249	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: #24244 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	370/2	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	5	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	4-53839 4 days ago	unknown	unknown
24246	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Ext iso quotient regular sequence	In this PR defined the `addequiv` between `Ext M N k` and `N =>[R] M/ rs * M` where `rs` is a regular sequence of length `k` Co-authored-by: Hu Yongle Co-authored-by: Wang Jingting --- - [ ] depends on: #23937 - [ ] depends on: #24244 - [ ] depends on: #24249 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	430/2	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	5	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	4-53794 4 days ago	unknown	unknown
23937	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): vanishing of induced hom between ext	In this PR we proved that the induced map `Ext(N,M)` -> `Ext(N,M)` from the left scalar multiple on `M` with `x` when `x` in `ann(N)` is zero. Co-authored-by: Wang Jingting Co-authored-by: Hu Yongle --- - [x] depends on: #19591 - [x] depends on: #23690 - [ ] depends on: #23935 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-category-theory blocked-by-other-PR WIP label:t-algebra$	148/0	Mathlib.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/RingTheory/Regular/Category.lean	3	n/a	['Thmoas-Guan', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	4-53780 4 days ago	unknown	unknown
24921	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): definition of depth	In this PR, we defined the depth of two modules as the minimal order of nonvanishing `Ext` and the `I-depth` for ideal `I` and some basic properties. Including the equivalence of the two in the condition of rees theorem. --- - [ ] depends on: #24249 - [ ] depends on: #24244 - [ ] depends on: #23937 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	663/2	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	5	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-53766 4 days ago	unknown	unknown
24923	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Auslander-Buchsbaum theorem	This PR mainly proved the Auslander-Buchsbaum theorem stating for a noetherian local ring `R` and a finitely generated `R` module `M` , `proj.dim(M) + depth(M) = depth(R)`. Co-authored-by: Yongle Hu --- - [ ] depends on: #24921 - [ ] depends on: #24249 - [x] depends on: #24734 - [x] depends on: #24697 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	1188/2	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	6	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-53707 4 days ago	unknown	unknown
25109	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): depth of QuotSMulTop	In this PR, we proved for a local ring `R` and a finitely generated `R` module `M N`, `IsSMulRegular M x` and `x ∈ Module.annihilator R N`, then `depth(N, M/xM) + 1 = depth(N, M)`, and its corollary for quotient regular seqence. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	949/2	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	5	n/a	['github-actions']	nobody	4-53662 4 days ago	unknown	unknown
24922	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Ischebeck theorem	This PR mainly proved the Ischbecke theorem, stating that `depth(N,M)` is greater or equal to `depth(M) - dim(N)` for finitely generated module `N, M` over local ring. --- - [ ] depends on: #24921 - [ ] depends on: #24249 - [ ] depends on: #24771 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR WIP label:t-algebra$	1020/2	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean	6	n/a	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-53613 4 days ago	unknown	unknown
25223	kckennylau author:kckennylau	feat(Algebra): Quadratic Algebra	--- WIP. Please adopt. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra please-adopt WIP label:t-algebra$	153/0	Mathlib.lean,Mathlib/Algebra/QuadraticAlgebra.lean	2	3	['github-actions', 'mans0954']	nobody	4-47922 4 days ago	13-76292 13 days ago	0-31 31 seconds
25287	digama0 author:digama0	feat(Bicategory/CatEnriched): 2-cat from Cat-enriched cat	A construction of the canonical strict bicategory structure given a `EnrichedCategory Cat C`. From the ∞-cosmos project. Co-Authored-By: Emily Riehl --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos t-category-theory awaiting-author	129/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/CatEnriched.lean	2	17	['digama0', 'emilyriehl', 'github-actions', 'joelriou', 'peabrainiac', 'yuma-mizuno']	nobody	4-45264 4 days ago	4-45264 4 days ago	7-22660 7 days
25347	sgouezel author:sgouezel	feat: define Riemannian manifolds	We introduce typeclasses to deal with Riemannian manifolds: * In a fiber bundle whose fibers are already endowed with an inner product space structure, `[IsContinuousRiemannianBundle F E]` registers the fact the inner product depends continuously on the base point. This is a Prop-valued class, on top of existing data `[∀ x, NormedAddCommGroup (E x)]` `[∀ x, InnerProductSpace ℝ (E x)]`. * We also register `[IsContMDiffRiemannianBundle n IB F E]` similarly. * There is an issue when the fibers already have a topological structure (for instance the tangent spaces), because adding an assumption `[∀ x, NormedAddCommGroup (TangentSpace I x)]` would create a diamond. Instead, we introduce another typeclass `[RiemannianBundle E]` containing the data of an inner product space on the fibers, compatible with the preexisting topology. From this class, we register instances of inner product space structures on the fibers, whose topology is defeq to the original one. * We make sure that registering concrete instances of `[RiemannianBundle E]` registers automatically `[IsContinuousRiemannianBundle F E]` and/or `[IsContMDiffRiemannianBundle n IB F E]` in terms of the regularity of the metric. * Under the assumptions `[RiemannianBundle (fun (b : M) -> TangentSpace I b)]` and `[EMetricSpace M]`, we register a Prop-valued typeclass `[IsRiemannianManifold I M]` registering the fact that the edist coincides with the infimum of the lengths of paths, measured using the normed space structure in the tangent spaces. With this design, one can develop the general theory of Riemannian bundles and Riemannian manifolds, and also define concrete instances. When working with a generic Riemannian manifold, the typeclasses will include (in addition to the usual one for manifolds, replacing the topological space one with an emetric space one) the assumptions `[RiemannianBundle (fun (b : M) -> TangentSpace I b)]` `[IsContinuousRiemannianBundle E (fun (b : M) -> TangentSpace I b)]` `[IsContMDiffRiemannianBundle n I E (fun (b : M) -> TangentSpace I b)]`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry WIP	981/56	Mathlib.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean,Mathlib/Data/Bundle.lean,Mathlib/Geometry/Manifold/ContMDiff/NormedSpace.lean,Mathlib/Geometry/Manifold/Riemannian/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Hom.lean,Mathlib/Geometry/Manifold/VectorBundle/Riemannian.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/Topology/FiberBundle/Basic.lean,Mathlib/Topology/FiberBundle/Constructions.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/VectorBundle/Basic.lean,Mathlib/Topology/VectorBundle/Constructions.lean,Mathlib/Topology/VectorBundle/Hom.lean,Mathlib/Topology/VectorBundle/Riemannian.lean	18	4	['github-actions', 'leanprover-bot', 'sgouezel']	nobody	4-41422 4 days ago	4-43956 4 days ago	0-1 1 second
25474	adomani author:adomani	test for .lean/.md check	A test PR for #25473. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed	10/1	.github/workflows/lint_and_suggest_pr.yml,Mathlib.lean,Mathlib/NumberTheory/NumberField/CMField.Lean	3	1	['github-actions']	nobody	4-36516 4 days ago	4-37849 4 days ago	4-37907 4 days
24769	YaelDillies author:YaelDillies	feat: `X ⟶ M` is a commutative monoid if `M` is a commutative monoid object	Also add a shortcut `Grp_.homMk` of `Mon_.Hom.mk` for `Grp_`, provide Yoneda-like lemmas for monoid morphisms and bundle `Mon_.ext` into an `Injective` lemma. Unsimp `Grp_Class.tensorHom_inv_inv_mul` since it loops with `IsMon_Hom.mul_hom` + `IsMon_Hom ι`. 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 t-category-theory	73/10	Mathlib/CategoryTheory/Monoidal/Cartesian/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean	4	35	['YaelDillies', 'erdOne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'robin-carlier']	nobody	4-35619 4 days ago	4-35679 4 days ago	28-30332 28 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/)	file-removed 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	79	['0art0', 'JovanGerb', 'eric-wieser', 'github-actions', 'grunweg', 'joneugster', 'leanprover-bot', 'leanprover-community-bot-assistant', 'rosborn']	nobody	4-35094 4 days ago	4-85032 4 days ago	237-83175 237 days
25453	JovanGerb author:JovanGerb	perf(Algebra/Homology/HomotopyCategory): use explicit universe parameter in `Category`	As we have seen before, writing `Category.{v}` instead of `Category` avoids a nasty universe level metavariable, and this helps to speed up unification. The changes in this PR are somewhat arbitrary, but it serves as an example for this principle. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	9/6	Mathlib/Algebra/Homology/HomotopyCategory/DegreewiseSplit.lean,Mathlib/Algebra/Homology/HomotopyCategory/MappingCone.lean,Mathlib/Algebra/Homology/HomotopyCategory/Triangulated.lean	3	5	['JovanGerb', 'github-actions', 'leanprover-bot']	nobody	4-32725 4 days ago	5-373 5 days ago	5-427 5 days
24465	adomani author:adomani	feat: a linter to enforce formatting	This linter enforces that the hypotheses of every declaration are correctly formatted. This already required multiple PRs to make mathlib compliant. Ideally, little by little the linter can be extended to format more of mathlib. --- The default linter option is `false`, but the lakefile enforces it to be `true`. This means that the linter does not run on `MathlibTest`. However, the tests should still be compliant, since the default option was `true` in development and the tests were fixed. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter maintainer-merge	876/4	Mathlib.lean,Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/Group/Nat/Defs.lean,Mathlib/Algebra/Ring/Int/Defs.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/CommandStart.lean,Mathlib/Tactic/Simps/NotationClass.lean,MathlibTest/CommandStart.lean,MathlibTest/EuclideanSpace.lean,MathlibTest/Simps.lean,MathlibTest/Traversable.lean,MathlibTest/antidiagonal.lean,MathlibTest/delabLinearIndependent.lean,MathlibTest/matrix.lean,MathlibTest/norm_num.lean,MathlibTest/set_like.lean,MathlibTest/vec_notation.lean	20	89	['Parcly-Taxel', 'adomani', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	grunweg assignee:grunweg	4-30689 4 days ago	27-42382 27 days ago *	40-47103 40 days *
25473	adomani author:adomani	feat(CI): check that Mathlib files have lean or md extension	Twice recently there have been files with an "intended" `.lean` extension in `Mathlib/`: * #24942, ending in `;lean`; * #25457, ending in `.Lean`. `mk_all` does not add these files to `Mathlib.lean`, since they do not end in `.lean` and this later causes problems. This CI step checks that all files in `Mathlib/` end with `.lean` or `.md`. See #25474 for a test where the new step [correctly fails](https://github.com/leanprover-community/mathlib4/actions/runs/15464097783/job/43532018379?pr=25474). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI delegated	10/0	.github/workflows/lint_and_suggest_pr.yml	1	10	['adomani', 'bryangingechen', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	4-25952 4 days ago	4-26842 4 days ago	0-11212 3 hours
25482	grunweg author:grunweg	chore(aesop_cat): update comment	Since mathlib includes leanprover/lean4#7448, update the comment accordingly. #25475 shows that this fast-path is still beneficial: so leave it, but update its comment accordingly. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	4/4	Mathlib/CategoryTheory/Category/Basic.lean	1	2	['JovanGerb', 'github-actions', 'grunweg']	nobody	4-24173 4 days ago	4-26873 4 days ago	4-26925 4 days
25484	VTrelat author:VTrelat	feat(SetTheory/ZFC/Booleans): define Boolean algebra in ZFC	Extend the model of ZFC with Boolean algebra: - define a set 𝔹 of booleans - define a proper type `ZFBool` representing booleans - add theorems on usual algebraic properties of booleans - provide usual boolean notations like `⊤`, `⊥`, `∧`, `∨`, etc. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483	new-contributor blocked-by-other-PR	619/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-24128 4 days ago	4-24130 4 days ago	0-1523 25 minutes
25485	VTrelat author:VTrelat	feat(SetTheory/ZFC/Naturals): define natural numbers in ZFC	Extend the model of ZFC with naturals: - define a set `Nat` of naturals following the usual construction (∅, {∅}, {∅, {∅}}, ...) - define a proper type `ZFNat` representing naturals - add theorems on usual algebraic properties of naturals - provide a recursor and induction schemes to define/prove by induction --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depend on: #25483	new-contributor	2095/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Naturals.lean	4	1	['github-actions']	nobody	4-22216 4 days ago	4-22281 4 days ago	4-22277 4 days
25265	FMLJohn author:FMLJohn	feat(Order/SupClosed): `compl_image_latticeClosure` and `compl_image_latticeClosure_eq_of_compl_image_eq_self`	The main results in this pull request are: 1. `compl_image_latticeClosure`: given any Boolean algebra `α` and `s : Set α`, `compl '' latticeClosure s` is the same as `latticeClosure (compl '' s)`; 2. `compl_image_latticeClosure_eq_of_compl_image_eq_self`: given any Boolean algebra `α` and `s : Set α` such that `compl '' s = s`, we have `compl '' latticeClosure s = latticeClosure s`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-order	59/1	Mathlib/Order/SupClosed.lean	1	8	['FMLJohn', 'YaelDillies', 'github-actions']	bryangingechen assignee:bryangingechen	4-22149 4 days ago	7-2121 7 days ago	11-11741 11 days
25369	Paul-Lez author:Paul-Lez	feat(Order/Fin/CircularOrder): add some basic results about the circular order on Fin	Co-authored-by: Oliver Nash --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	33/0	Mathlib.lean,Mathlib/Order/Circular.lean,Mathlib/Order/Fin/CircularOrder.lean	3	11	['Paul-Lez', 'YaelDillies', 'eric-wieser', 'github-actions']	bryangingechen assignee:bryangingechen	4-22121 4 days ago	4-22121 4 days ago	2-19068 2 days
25483	VTrelat author:VTrelat	chore(Data/Set/Prod, SetTheory/ZFC/Basic): add theorem prod_subset_of_prod and extend ZFC model	Required by @eric-wieser in #24281 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	103/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean	2	2	['VTrelat', 'github-actions']	nobody	4-20161 4 days ago	4-26780 4 days ago	4-26834 4 days
25488	VTrelat author:VTrelat	feat(SetTheory/ZFC/Rationals): define rationals in ZFC	Extend the model of ZFC with rationals: we define a proper type `ZFRat` representing integers based on pairs of `ZFInt` (enforcing the res to be nonzero) and following the usual construction of rationals. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483 - [ ] depends on: #25485 - [ ] depends on: #25486	new-contributor blocked-by-other-PR	2070/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Integers.lean,Mathlib/SetTheory/ZFC/Rationals.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-19805 4 days ago	4-19807 4 days ago	0-1808 30 minutes
25486	VTrelat author:VTrelat	feat(SetTheory/ZFC/Integers): define integers in ZFC	Extend the model of ZFC with integers following the converse direction as for naturals. We first define a type and then build a set. We finally show that both representations have coercions in both direction: - define a proper type `ZFInt` representing integers based on `ZFNat × ZFNat` and following the usual construction of integers - add theorems on usual algebraic properties of integers - define a set `Int` and show that it matches-i.e. that it is isomorphic to-the type `ZFInt` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483 - [ ] depends on: #25485	new-contributor blocked-by-other-PR	2003/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Integers.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-19803 4 days ago	4-19805 4 days ago	0-2067 34 minutes
24321	peabrainiac author:peabrainiac	feat(CategoryTheory/Adjunction): more results on adjoint triples.	Lemmas about adjoint triples `F ⊣ G ⊣ H` where either `G` is fully faithful or `F` and `H` are. From [lean-orbifolds](https://github.com/peabrainiac/lean-orbifolds/blob/387fe778f3cc1ed3c5e60f390842333ecc9eda67/Orbifolds/ForMathlib/Triple.lean). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	255/19	Mathlib/CategoryTheory/Adjunction/Triple.lean,Mathlib/CategoryTheory/EpiMono.lean	2	14	['github-actions', 'joelriou', 'leanprover-bot', 'peabrainiac']	nobody	4-17509 4 days ago	4-17509 4 days ago	22-20077 22 days
25493	IvanRenison author:IvanRenison	feat(Analysis/InnerProductSpace/Positive): add theorem `IsPositive.nonneg_eigenvalues`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis	8/0	Mathlib/Analysis/InnerProductSpace/Positive.lean	1	1	['github-actions']	nobody	4-16988 4 days ago	4-16994 4 days ago	4-17054 4 days
25172	eric-wieser author:eric-wieser	feat: restricting `Affine.Simplex` to an affine subspace that contains it	Also removes a redundant `Nonempty` argument. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-euclidean-geometry	68/5	Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Basic.lean,Mathlib/LinearAlgebra/AffineSpace/Independent.lean	2	10	['eric-wieser', 'github-actions', 'jsm28', 'ocfnash']	nobody	4-16192 4 days ago	15-26171 15 days ago	15-67045 15 days
25254	fpvandoorn author:fpvandoorn	fix: cleanup measurability + prod/sum lemmas + fun_prop	* Add `fun_prop` to a few more lemmas * Rename the compositional version to something without a prime, add the compositional version for `StronglyMeasurable` * use the `prod/fun_prod` naming scheme (the compositional version is called `prod_apply`) for `[AE][Strongly]Measurable` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	128/50	Mathlib/MeasureTheory/Function/StronglyMeasurable/AEStronglyMeasurable.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Group/Arithmetic.lean,Mathlib/Probability/Integration.lean,Mathlib/Probability/Martingale/Basic.lean,Mathlib/Probability/Martingale/BorelCantelli.lean,Mathlib/Probability/Martingale/Centering.lean	8	6	['fpvandoorn', 'github-actions', 'sgouezel']	nobody	4-12035 4 days ago	4-22296 4 days ago	1-38112 1 day
25427	Paul-Lez author:Paul-Lez	feat(Analysis/Calculus/PartialDerivatives): Propose notation for partial derivatives.	This PR introduces a notation for partial derivatives, taken with respect to a canonical basis. The idea here is that this might be useful for e.g. writing down PDEs. The notation allows use to write things like ```lean -- The canonical basis for `ℝ × ℝ` is indexed by `Fin 0` so `∂₀[ℝ]` corresponds to taking -- the first partial derivative example : (∂₀[ℝ] fun (x : ℝ × ℝ) => x.1) 0 = 1 := by simp [Pi.zero_def, lineDeriv] ``` This has already been discussed on Zulip [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Partial.20derivatives). I've opened this PR as a draft in order to get preliminary feedback on the contents (e.g. is this appropriate for Mathlib?); the file contains some demos of the notation in action. Co-authored-by: Eric Wieser --- - [ ] depends on: #25425 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	195/0	Mathlib.lean,Mathlib/Analysis/Calculus/PartialDerivatives/Notation.lean,Mathlib/LinearAlgebra/Basis/HasCanonicalBasis.lean	3	13	['github-actions', 'lecopivo', 'mathlib4-dependent-issues-bot', 'ocfnash']	nobody	4-9860 4 days ago	5-34143 5 days ago	0-0 0 seconds
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	169/0	Mathlib.lean,Mathlib/CategoryTheory/Join/Basic.lean,Mathlib/CategoryTheory/Join/Pseudofunctor.lean	3	10	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	4-202 4 days ago	4-224 4 days ago	51-19980 51 days
25500	eric-wieser author:eric-wieser	feat: delaborators for metadata	Being able to see these is very important when debugging tactic failures. Probably these could be upstreamed, but I don't think that's a reason not to merge them here first. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta	78/3	Mathlib/Util/Delaborators.lean,Mathlib/Util/PPOptions.lean,MathlibTest/delaborators.lean	3	1	['github-actions']	nobody	3-83296 3 days ago	3-83304 3 days ago	3-83365 3 days
25255	Raph-DG author:Raph-DG	feat(RingTheory): Order of vanishing in a ring	In this PR we define the order of vanishing of a ring and its extension to elements of the function field (as in stacks project 02MD) as well as some basic API. Note that I'm slightly unsure that some of the lemmas used to prove this are at the right level of generality, and further I'm not quite sure where some of these lemmas belong (as indicated by the comments in the main OrderOfVanishing.lean file). Any comments about this would be very much appreciated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge new-contributor t-algebra RFC label:t-algebra$	247/0	Mathlib.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/OrderOfVanishing.lean	6	83	['Raph-DG', 'chrisflav', 'erdOne', 'github-actions', 'jcommelin']	nobody	3-81423 3 days ago	3-82009 3 days ago	10-61393 10 days
25218	kckennylau author:kckennylau	feat(AlgebraicGeometry): Tate normal form of elliptic curves	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip new-contributor t-algebraic-geometry	291/26	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Modular/TateNormalForm.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	5	29	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'github-actions', 'grunweg', 'kckennylau']	nobody	3-79757 3 days ago	7-32169 7 days ago	6-51040 6 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: #25510 (shuffling homeomorphism properties around, to avoid a non-linear dependency - [x] depends on: #22969 - [x] depends on: #22964 [![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	196/71	Mathlib/Data/Sum/Basic.lean,Mathlib/Topology/Constructions/SumProd.lean	2	23	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'plp127']	nobody	3-60871 3 days ago	3-60873 3 days ago	0-0 0 seconds
25510	grunweg author:grunweg	chore(Topology/Constructions/SumProd.lean): split homeomorphism properties section	Move properties about products to the products section, and sum properties to the sum section: this is necessary for #22137, which will use homeomorphism properties for sums for inducing maps. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	81/71	Mathlib/Topology/Constructions/SumProd.lean	1	1	['github-actions']	nobody	3-60375 3 days ago	3-61728 3 days ago	3-61714 3 days
24669	qawbecrdtey author:qawbecrdtey	feat(Analysis/Normed/Operator/LinearIsometry): added definition `LinearIsometryEquiv.prodComm`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This commit defines a `LinearIsometryEquiv`, and states some trivial theorems about it. ```lean def prodComm [Module R E₂] : E × E₂ ≃ₗᵢ[R] E₂ × E ```	maintainer-merge t-analysis	21/1	Mathlib/Analysis/Normed/Operator/LinearIsometry.lean	1	7	['Ruben-VandeVelde', 'eric-wieser', 'faenuccio', 'github-actions', 'jcommelin', 'qawbecrdtey']	faenuccio assignee:faenuccio	3-57041 3 days ago	5-39681 5 days ago	32-56510 32 days
25450	pechersky author:pechersky	feat(Valued): Valuation.leAddSubgroup and ideal/submodule versions of ltAddSubgroup	Also prove that these are clopen. Factored out of #24627 Fix capitalization spelling mistake on `closedball` in a lemma --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis t-number-theory label:t-algebra$	272/30	Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Integers.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean	4	4	['faenuccio', 'github-actions', 'pechersky']	nobody	3-56323 3 days ago	5-5847 5 days ago	5-7366 5 days
24627	pechersky author:pechersky	feat(Topology/Algebra/Valued): `IsLinearTopology 𝒪[K] K` and `𝒪[K] 𝒪[K]`	as well as `IsLinearTopology ℤ_[p] ℤ_[p]` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25450	t-topology awaiting-author blocked-by-other-PR	376/30	Mathlib.lean,Mathlib/NumberTheory/Padics/LinearTopology.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Integers.lean,Mathlib/Topology/Algebra/Valued/LinearTopology.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean	8	40	['ADedecker', 'faenuccio', 'github-actions', 'loefflerd', 'mathlib4-dependent-issues-bot', 'pechersky']	nobody	3-55509 3 days ago	5-5130 5 days ago	19-50489 19 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 awaiting-author label:t-algebra$	74/0	Mathlib.lean,Mathlib/FieldTheory/Galois/Abelian.lean,Mathlib/NumberTheory/Cyclotomic/Gal.lean	3	6	['acmepjz', 'alreadydone', 'chrisflav', 'erdOne', 'github-actions', 'xroblot']	nobody	3-50620 3 days ago	36-34663 1 month ago	29-68817 29 days
25522	grunweg author:grunweg	chore: add ContinuousLinearEquiv.prodAssoc	A continuous version of LinearEquiv.prodAssoc. Part of #25505 (on the path towards defining submanifolds). --- - [ ] depends on: #23971 for simplicity [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	127/30	Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Prod.lean,Mathlib/LinearAlgebra/Prod.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/VectorBundle/Constructions.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-47026 3 days ago	3-47028 3 days ago	0-568 9 minutes
25505	grunweg author:grunweg	feat: a `SliceModel` typeclass for models with corners for embedded submanifolds	TODO: write a proper PR description (once things settle down a bit, and the dependent PRs have landed) Then ask e.g. Sebastien for review. Rebased and extended version of #24550: - on the current master branch - does not import the definition of smooth immersions/embeddings: this only defines slice models (no more) --- - [ ] depends on: #23971 - [ ] depends on: #25522 - [ ] depends on: #25524 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR WIP	288/0	Mathlib.lean,Mathlib/Geometry/Manifold/SliceModel.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-44397 3 days ago	3-59499 3 days ago	0-2 2 seconds
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	8	['github-actions', 'grunweg', 'mathlib-bors', 'ocfnash']	nobody	3-43644 3 days ago	114-83977 3 months ago	15-25642 15 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	13	['adomani', 'b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	3-43553 3 days ago	87-17765 2 months ago	15-14325 15 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/)	new-contributor t-algebra delegated label:t-algebra$	213/0	Mathlib.lean,Mathlib/FieldTheory/Minpoly/ConjRootClass.lean,Mathlib/FieldTheory/Minpoly/IsConjRoot.lean	3	16	['LessnessRandomness', 'Vierkantor', 'alreadydone', 'github-actions', 'grunweg', 'mathlib-bors']	Vierkantor assignee:Vierkantor	3-43512 3 days ago	14-19065 14 days ago	94-8480 94 days
25326	YaelDillies author:YaelDillies	feat: `Mon_ C` is cartesian-monoidal if `C` is	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-category-theory	36/0	Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Mon_.lean	2	3	['github-actions', 'joelriou', 'leanprover-community-bot-assistant']	nobody	3-43510 3 days ago	3-43579 3 days ago	8-7875 8 days
23971	grunweg author:grunweg	feat: ContinuousLinearEquiv.{prodUnique,uniqueProd}	which are `LinearEquiv.{prodUnique,uniqueProd}` as a continuous linear equivalence. Discovered when working on slice models for defining submanifolds (#24550), one step towards defining smooth submanifolds. --- - [x] depends on: #24168 (for the LinearEquiv) part - [x] depends on: #25513 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	61/3	Mathlib/LinearAlgebra/Prod.lean,Mathlib/Topology/Algebra/Module/Equiv.lean	2	9	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib4-dependent-issues-bot']	nobody	3-37622 3 days ago	3-38594 3 days ago	10-52636 10 days
23674	xroblot author:xroblot	feat(NumberField/IsCM): first results about the action of `complexConjugation` on units	--- - [x] depends on: #23536 - [x] depends on: #23453 - [ ] depends on: #23684 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory blocked-by-other-PR	227/72	Mathlib/Algebra/Field/Equiv.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/AlgebraicGeometry/Morphisms/Proper.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/GroupTheory/GroupAction/FixedPoints.lean,Mathlib/LinearAlgebra/Dimension/Localization.lean,Mathlib/NumberTheory/NumberField/CMField.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/SimpleRing/Field.lean	15	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	3-37572 3 days ago	3-37580 3 days ago	0-703 11 minutes
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 awaiting-CI	41/0	Mathlib/CategoryTheory/Limits/FunctorCategory/Basic.lean	1	12	['adomani', 'github-actions', 'robertmaxton42', 'robin-carlier']	nobody	3-34653 3 days ago	3-76008 3 days ago	50-83251 50 days
24593	Multramate author:Multramate	refactor(AlgebraicGeometry/EllipticCurve/*): replace Fin 3 with products	This allows the removal of all instances of `erw` in `Jacobian` and `Projective` files. --- - [x] depends on: #21356 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	1000/1022	Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean	6	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	3-34471 3 days ago	unknown	unknown
25030	Multramate author:Multramate	feat(NumberTheory/EllipticDivisibilitySequence): add elliptic nets	Defines elliptic nets and redefines elliptic sequences using elliptic relators. This is part of #13057 by Junyan Xu. Co-authored-by: Junyan Xu --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	259/37	Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	1	1	['github-actions']	nobody	3-33209 3 days ago	17-77730 17 days ago	17-77714 17 days
25132	Multramate author:Multramate	chore(NumberTheory/EllipticDivisibilitySequence): rename definitions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory WIP	265/45	Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	3-33201 3 days ago	3-33894 3 days ago	0-1 1 second
25524	grunweg author:grunweg	feat: EuclideanSpace.finAddEquivProd	I need this for #25505 (to show that R^n is a submanifold of R^m for n \leq m) and for my bordism theory branch. Previous zulip discussions: - [#Is there code for X? > Product of Euclidean spaces @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Product.20of.20Euclidean.20spaces/near/500124944) - [#mathlib4 > Create `LinearIsometryEquiv` with `WithLp 2 (α × β)` and.. @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Create.20.60LinearIsometryEquiv.60.20with.20.60WithLp.202.20.28.CE.B1.20.C3.97.20.CE.B2.29.60.20and.2E.2E/near/505938119) - [#mathlib4 > Manifold structure on Moebius strip @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Manifold.20structure.20on.20Moebius.20strip/near/522156122) Co-authored-by: @peabrainiac --- TODO: paste my zulip reasoning above into the PR description. I still believe my applications 1 and 2 may hold water, but 3/4 may not. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	21/0	Mathlib/Analysis/InnerProductSpace/PiL2.lean	1	5	['eric-wieser', 'github-actions', 'grunweg']	nobody	3-29993 3 days ago	3-45111 3 days ago	3-45170 3 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. --- - [x] depends on: #23969 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry please-adopt WIP	75/6	Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	3-29903 3 days ago	3-30839 3 days ago	0-0 0 seconds
24917	adomani author:adomani	feat: deprecated module automation	This PR is a revised version of #24861. It splits the `#create_deprecated_modules` into two commands: * `#create_deprecated_module path/to/file.lean` that guides you through generating a deprecated file; * `#find_deleted_files n` that looks at the repository `n` commits ago and returns a `#create_deprecated_module` for each file that existed then and does not exist now. This is integrated with `Try these:` suggestions and is intended as a first step in making this process completely automatic. Each regenerated file consists of just the imports of the last file that existed, before deletion, followed by `deprecated_import (since := "YYYY-MM-DD")`. In particular, this also applies to renames, where it might be more natural to suggest the renamed file, rather than its imports. However, this is part of the deprecation logic that I consider best left to a possible future PR, since distinguishing renames from removals is a separate matter that even git does not handle completely satisfactorily. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	374/0	scripts/README.md,scripts/create_deprecated_modules.lean	2	42	['YaelDillies', 'adomani', 'github-actions', 'grunweg']	grunweg assignee:grunweg	3-28364 3 days ago	3-28364 3 days ago	21-26659 21 days
25529	loefflerd author:loefflerd	feat(Counterexamples): topologists' sine curve	Define the "topologists' sine curve" in R^2, and show that its closure is connected but not path-connected. This formalization is part of the bachelor thesis of Daniele Bolla at UniDistance Switzerland. Co-authored-by: Daniele Bolla --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	229/1	Counterexamples.lean,Counterexamples/TopologistsSineCurve.lean,Mathlib/Topology/Connected/PathConnected.lean	3	4	['github-actions', 'grunweg', 'loefflerd']	nobody	3-27952 3 days ago	3-39699 3 days ago	3-39753 3 days
24441	MrSumato author:MrSumato	feat(Data/List): add Lyndon-Schutzenberger theorem on list commutativity	Add Lyndon-Schutzenberger theorem on list commutativity. Included definition for List.repeatSelf that returns list repeated n times. --- This is my first mathlib PR, so any comments are highly appreciated. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	129/1	Mathlib.lean,Mathlib/Data/List/Commutativity.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/Lemmas.lean	4	35	['MrSumato', 'github-actions', 'grunweg', 'plp127']	grunweg assignee:grunweg	3-25453 3 days ago	3-25453 3 days ago	29-59355 29 days
25025	scholzhannah author:scholzhannah	feat(Topology/CWComplex/Classical/Basic.lean): basic lemmas about CW complexes	This PR has a few basic lemmas about (classical) CW complexes that will be necessary for the addition of subcomplexes. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	44/2	Mathlib/Topology/CWComplex/Classical/Basic.lean	1	5	['github-actions', 'grunweg']	grunweg assignee:grunweg	3-24876 3 days ago	3-24876 3 days ago	17-72261 17 days
25362	adomani author:adomani	feat: a linter for duplicated `open`	This linter warns when a namespace is repeated. It makes an effort to report only the problematic namespaces, but is not especially robust. The linter has some awareness of the `namespace` command, so ```lean def X.Y := 0 open X namespace X open Y ``` will flag both `namespace X` and `open Y` as problematic, even though it was the `open `X` that became redundant with `namespace X`. However, I will not have much time to devote to polishing this and there are quite a few exception in Mathlib before a better version could be seriously considered for adoption. [#mathlib4 > linter requests @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/linter.20requests/near/520273644) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import please-adopt	177/28	Mathlib.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Bound.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/DupOpen.lean,Mathlib/Tactic/NormNum/PowMod.lean,Mathlib/Tactic/ReduceModChar.lean,Mathlib/Tactic/Widget/StringDiagram.lean,Mathlib/Topology/CWComplex/Abstract/Basic.lean,Mathlib/Topology/ContinuousMap/Interval.lean,Mathlib/Topology/Germ.lean,Mathlib/Topology/Homotopy/HSpaces.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/Order/PartialSups.lean,Mathlib/Topology/Separation/DisjointCover.lean,Mathlib/Topology/Sheaves/Sheafify.lean,MathlibTest/DupOpen.lean	20	13	['adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	3-23334 3 days ago	6-12843 6 days ago	0-0 0 seconds
25516	kim-em author:kim-em	chore: test PR from fork	This PR tests making a PR from a fork.		1/0	Mathlib/Computability/AkraBazzi/AkraBazzi.lean	1	1	['bryangingechen']	nobody	3-22035 3 days ago	3-58538 3 days ago	0-0 0 seconds
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	8	['eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors', 'urkud']	nobody	3-20874 3 days ago	77-76255 2 months ago	0-12104 3 hours
25537	literandltx author:literandltx	feat(number_theory/legendre_symbol): Add sqrt‐of‐residue theorems for p=4k+3 and p=8k+5	Add a new file `QuadraticResidueRoots.lean` under `Mathlib/NumberTheory/LegendreSymbol/` that proves two explicit “square-root of quadratic residue” theorems for primes of the specific form. - `exists_sqrt_of_residue_mod4_eq3` for primes `p = 4k + 3` - `exists_sqrt_of_residue_mod8_eq5`* for primes `p = 8*k + 5` It also introduces the helper lemmas `euler_criterion_traditional` and `legendreSym.at_two_mod8_eq_5`. Import lines in `Mathlib.lean` and `Mathlib/NumberTheory/LegendreSymbol/Basic.lean` have been updated accordingly.	new-contributor	217/0	Mathlib.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticReciprocity.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticResidueRoots.lean	4	0	[]	nobody	3-19735 3 days ago	3-19735 3 days ago	0-0 0 seconds
25318	scholzhannah author:scholzhannah	feat(Topology/Compactness/CompactlyCoherentSpace): compact coherentification (k-ification)	This PR defines the notion of turning an arbitrary topological space into a compactly coherent space. Compactly coherent spaces are commonly referred to as "compactly generated spaces" or "k-spaces" in the literature while the operation of turning a space into such as space is called the "k-ification". There are however three different notions that are described with this name. To disambiguate we use the names "compactly coherent space" and "compactcoherentification" here. See [this wikipedia page](https://en.wikipedia.org/wiki/Compactly_generated_space) for an explanation of these notions. Co-authored-by: Floris van Doorn --- - [ ] depends on: #21237 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	175/5	Mathlib/Topology/Compactness/CompactlyCoherentSpace.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	3-16736 3 days ago	3-26961 3 days ago	5-20518 5 days
8167	sebzim4500 author:sebzim4500	feat: a `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 awaiting-author	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	61	['JLimperg', 'JovanGerb', 'Vierkantor', 'digama0', 'eric-wieser', 'fpvandoorn', 'github-actions', 'hrmacbeth', 'kim-em', 'leanprover-community-mathlib4-bot', 'sebzim4500']	nobody	3-2362 3 days ago	12-11127 12 days ago	111-42249 111 days
25499	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal): left action of monoidal categories	Define (left) actions of a monoidal category on a category: a `MonoidalLeftAction` of a monoidal category `C` on a category `D` consists of an action bifunctor `- ⊙ - : C ⥤ D ⥤ D`, equipped with structural natural isomorphisms `(- ⊗ -) ⊙ - ≅ - ⊙ - ⊙ -` and `𝟙_ C ⊙ - ≅ -`, subject to coherence conditions. The code in this PR is parallel to the existing code for monoidal category. We provide a battery of basic `simp` lemmas to ease working with this type class, and show that every monoidal category acts on itself via its tensor product. The code is put in a new subdirectory `CategoryTheory/Monoidal/Action`. Future wok on the subject includes - Providing a constructor for `MonoidalLeftAction` taking a monoidal functor from `C` to `D ⥤ D`, where the latter has the "composition" monoidal structure. - Constructing the action of `C ⥤ C` on `C`. - Extending the notion of module objects internal to a monoidal category to allow the `Mon_ ` object to be in `C`, and the module to be in `D` where `D` has a monoidal left action of `C`. - Using the two previous points, show that given a monad `M`, there is an equivalence of categories between `Algebra M` and modules in `C` over the monoid `M.toMon : Mon_ (C ⥤ C)̀`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	348/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Action/Basic.lean,docs/references.bib	3	1	['github-actions']	nobody	3-429 3 days ago	3-12085 3 days ago	3-85883 3 days
25545	robin-carlier author:robin-carlier	refactor(CategoryTheory/Monoidal/Mod_): refactor `Mod_` using `MonoidalLeftAction`	Generalize the definition of `CategoryTheory.Monoidal.Mod_Class` and `CategoryTheory.Monoidal.Mod_` to modules in `D` over a monoid object in `C`, where `C` acts monoidally on `D`. At the same time, we refactor `Mod_` in a way similar to the one `Mon_` has been refactored in #24646. i.e we favor `Mod_Class` in the definition and `Mod_`, and introduce a Prop-class `IsMod_Hom` to define morphisms of modules. --- - [ ] depends on: #25499 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	551/112	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Action/Basic.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Mod_.lean,Mathlib/CategoryTheory/Monoidal/Mod_.lean,docs/references.bib	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	2-86281 2 days ago	3-424 3 days ago	0-459 7 minutes
22586	joelriou author:joelriou	feat(CategoryTheory/Localization): the right derivability structure given by functorial resolutions	In this PR, we provide a constructor for right derivability structures. We assume that `Φ : LocalizerMorphism W₁ W₂` is given by a fully faithful functor `Φ.functor : C₁ ⥤ C₂` and that we have a resolution functor `ρ : C₂ ⥤ C₁` with a natural transformation `i : 𝟭 C₂ ⟶ ρ ⋙ Φ.functor` such that `W₂ (i.app X₂)` for any `X₂ : C₂`. If we assume that `W₁` is induced by `W₂`, that `W₂` is multiplicative and has the two out of three property, then `Φ` is a right derivability structure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	153/0	Mathlib.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/OfFunctorialResolutions.lean,Mathlib/CategoryTheory/Localization/LocalizerMorphism.lean	3	13	['github-actions', 'joelriou', 'robin-carlier']	nobody	2-83814 2 days ago	2-83814 2 days ago	92-80070 92 days
24612	Paul-Lez author:Paul-Lez	feat(Tactic/ImportDiff): add `#import_diff` command	This PR adds the `#import_diff` command, which lists new transitive imports added by extending the list of imports of a file. The aim of this command is to help with debugging large import changes. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	will-close-soon t-meta awaiting-author	35/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ImportDiff.lean	3	8	['adomani', 'github-actions', 'joneugster']	adomani and joneugster assignee:joneugster assignee:adomani	2-82314 2 days ago	2-82314 2 days ago	2-61262 2 days
25548	robin-carlier author:robin-carlier	chore(CategoryTheory/Limits/Shape/End): define coends	The content of `CategoryTheory/Limits/Shapes/End` was not dualized, so only ends where defined, but not coends. This PR dualizes the content of the file: we introduce `Cowedge`s as special kinds of `Multicofork`s, and define the `coend_ F` as the colimit of a canonical cowedge we can build from `F : Jᵒᵖ ⥤ J ⥤ C`. Also, we rename `CategoryTheory.Limits.hom_ext` to `CategoryTheory.Limits.end_.hom_ext`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	137/7	Mathlib/CategoryTheory/Limits/Shapes/End.lean,Mathlib/CategoryTheory/Limits/Shapes/Multiequalizer.lean	2	1	['github-actions']	nobody	2-79904 2 days ago	2-79904 2 days ago	2-79943 2 days
24540	robertmaxton42 author:robertmaxton42	feat(Quiv): add the empty, vertex, point, interval, and walking quivers	Add: * The empty quiver * The vertex quiver (one vertex, and no edges) and the point quiver (one vertex, one self-edge) * The interval quiver (two vertices with an edge between them) * The walking quiver (vertices `0` and `1` with two edges both `0 -> 1`. Functors from the walking quiver to `Type` define quivers, by interpreting `F.obj 0` as the type of vertices, `F.obj 1` as the type of edges, using one of the two edges to label the source of every edge and using the other to label the target.) - [x] depends on: #24538 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	370/0	Mathlib.lean,Mathlib/CategoryTheory/Category/Quiv/Shapes.lean,Mathlib/CategoryTheory/Category/Quiv/WalkingQuiver.lean,Mathlib/Logic/Small/Defs.lean	4	12	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robertmaxton42', 'robin-carlier']	nobody	2-76295 2 days ago	2-76295 2 days ago	0-80193 22 hours
25550	eric-wieser author:eric-wieser	doc: explain the fields of MonadWriter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data documentation	11/3	Mathlib/Control/Monad/Writer.lean	1	1	['github-actions']	nobody	2-75463 2 days ago	2-75463 2 days ago	2-77548 2 days
25534	JovanGerb author:JovanGerb	feat: let `gcongr` deal with implications	This PR implements support for the `_ → _` relation in the `gcongr` tactic. This can be useful in its own right, but the main reason for this is to later implement the `grw` and `gconvert` tactic using this infrastructure. To be more specific, `_ → _` is now supported as a relation, and as a constant. Supporting it as a constant is not necessary for the purpose of `grw`, but it seems natural to add support for it in this PR, so that lemmas like `imp_imp_imp` can be used by `gcongr`. To make `_ → _` in `gcongr` work more easily out of the box, I've built in support for goals of the form `r a b → r c d` where `r` is a transitive relation (i.e. it implements `isTrans α r`). This behaviour can be overridden with a `@[gcongr]` tag, and this is in particular done for the `<` relation, since we want the new goals to use `≤` instead of `<`. [#mathlib4 > Rewrite with inequalities @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Rewrite.20with.20inequalities/near/522751787) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta	280/93	Mathlib/Tactic/Core.lean,Mathlib/Tactic/GCongr.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GCongr/CoreAttrs.lean,MathlibTest/GCongr/implications.lean,MathlibTest/GCongr/inequalities.lean,MathlibTest/GCongr/mod.lean,scripts/noshake.json	8	6	['JovanGerb', 'github-actions', 'grunweg']	nobody	2-74970 2 days ago	2-75464 2 days ago	3-19120 3 days
25556	Parcly-Taxel author:Parcly-Taxel	chore: remove >6 month old material in `Deprecated`		file-removed tech debt	0/250	Mathlib.lean,Mathlib/Deprecated/Cardinal/Continuum.lean,Mathlib/Deprecated/Cardinal/Finite.lean,Mathlib/Deprecated/Cardinal/PartENat.lean,Mathlib/Deprecated/Order.lean	5	1	['github-actions']	nobody	2-55793 2 days ago	2-55846 2 days ago	2-55905 2 days
25459	emilyriehl author:emilyriehl	Feat(CategoryTheory): terminal categories with an application to hoFunctor	Some preliminary API around terminal categories is developed with an application for the infinity-cosmos project: proving that the homotopy category functor preserves terminal objects. We also include proofs that `[0]` is terminal in the simplex category and `Δ[0]` is the terminal simplicial set. Co-authored by [Robin Carlier](robin.carlier@ens-lyon.fr), [Adam Topaz](topaz@ualberta.ca), and [Zeyi Zhao](zzhao95@jh.edu). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos large-import t-category-theory	178/3	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/CategoryTheory/Category/Cat/Terminal.lean,Mathlib/CategoryTheory/Category/ReflQuiv.lean,Mathlib/CategoryTheory/Quotient.lean	7	3	['emilyriehl', 'github-actions', 'jcommelin']	nobody	2-47711 2 days ago	4-23991 4 days ago	4-81274 4 days
19860	YaelDillies author:YaelDillies	refactor: review the `simps` projections of `OneHom`, `MulHom`, `MonoidHom`	Make `simps` generate `coe_concreteHom` rather than`concreteHom_apply`. From FLT --- In fact, I would love to have both the `coe_` and `_apply` projections simultaneously and also to not have to specify ` simps (config := .asFn))` every single time we want to generate the `coe_` projection, but `simps ` seems to not be able to do that? cc @fpvandoorn I must say, after four years of working on mathlib, I still don't understand how one is supposed to use `simps`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI label:t-algebra$	100/118	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	4	['fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant']	nobody	2-41818 2 days ago	2-41839 2 days ago	0-17 17 seconds
25215	mans0954 author:mans0954	feature(RingTheory/RootsOfUnity/Basic) : rootsOfUnity coercions	For a commutative monoid, `rootsOfUnity` can be coerced to the set `{z : R \| z^k = 1}`. For a commutative ring which is a domain, `rootsOfUnity` can be coerced to `nthRootsFinset k (1 : R)`. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/roots.20of.20unity.20-.20computing.20low.20degree/with/520362922 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	22/0	Mathlib/RingTheory/RootsOfUnity/Basic.lean	1	1	['github-actions']	nobody	2-39154 2 days ago	14-10564 14 days ago	14-10619 14 days
24828	mans0954 author:mans0954	feature(Algebra/Polynomial/Roots) : nthRoots_two_unit_of_char_ne_two	Compute the second roots of the unit for rings of characteristic not 2. See also: #25215 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	11/0	Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Data/Multiset/ZeroCons.lean	2	1	['github-actions']	nobody	2-39084 2 days ago	27-53731 27 days ago	27-59865 27 days
25175	zcyemi author:zcyemi	feat(Geometry/Euclidean/Congurence): add triangle congruence	Add triangle congruence theorems. --- Some parts of the [original PR](https://github.com/leanprover-community/mathlib3/pull/18214) in Lean 3 have already been migrated to mathlib4: `Mathlib.Topology.MetricSpace.Congruence` and `Mathlib.Topology.MetricSpace.Similarity`. Therefore, I just rearranged the file and left the core triangle congruence proofs here. I'm not sure whether we need a standalone `Congruence.lean` file or if we should merge these into `Triangle.lean`. The law of sines was commited with another PR. Discussion on [zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Law.20of.20Sines.20for.20Euclidean.20Geometry.20Triangles/near/520245156) - [ ] depends on: #25174 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-euclidean-geometry blocked-by-other-PR	211/1	Mathlib/Geometry/Euclidean/Congruence.lean,Mathlib/Geometry/Euclidean/Triangle.lean	2	12	['JovanGerb', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	2-38945 2 days ago	15-47839 15 days ago	0-1224 20 minutes
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	81/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/MultiequalizerPullback.lean	2	13	['erdOne', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	2-37313 2 days ago	2-39279 2 days ago	42-7640 42 days
25557	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Data.Nat.LogFueled): fueled version of `clog`	This is an attempt to `fuel` docs#Nat.clog (and similar functions, later on, with the intent of making docs#primeFactorsList being computed). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data WIP	201/0	Mathlib.lean,Mathlib/Data/Nat/LogFueled.lean	2	1	['github-actions']	nobody	2-36506 2 days ago	2-44998 2 days ago	0-60 1 minute
25059	s235282 author:s235282	feat(Combinatorics/SimpleGraph/Bipartite): a graph is 2-colorable iff it's bipartite	Define a predicate for a simple graph to be bipartite (`def IsBipartite (G : SimpleGraph V) : Prop := G.Colorable 2`) and prove ` G.IsBipartite ↔ ∃ s t : Set V, G.IsBipartiteWith s t`. --- This is my first attempt at contributing to mathlib and therefore I have a couple of points of uncertainty related to: - Naming conventions for theorems - Seeing a lot of isBipartite vs IsBipartite in the original work. What do we want to go with when? - Definition placement - Where should I put the IsBipartite definition. - Structure of biimplication theorems - Should I combine the different lemmas into 1 bgi theorem? Feedback is greatly appreciated :) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import maintainer-merge new-contributor t-combinatorics	36/3	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean	1	30	['YaelDillies', 'github-actions', 'mitchell-horner', 's235282']	nobody	2-36455 2 days ago	2-37002 2 days ago	8-84432 8 days
24261	Paul-Lez author:Paul-Lez	chore: replace `WithLp.equiv` with a new pair `WithLp.toLp`/`WithLp.ofLp`	This PR does the following: - deprecate `WithLp.equiv` - Add `WithLp.toLp` and `WithLp.ofLp` (for consistency with other equivalences to type synonyms) See [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/defeq.20abuse.20in.20.60WithLp.60) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	759/366	Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Calculus/ContDiff/WithLp.lean,Mathlib/Analysis/Calculus/FDeriv/WithLp.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/ProdL2.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/Normed/Algebra/UnitizationL1.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/Analysis/RCLike/Inner.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/LinearAlgebra/Matrix/LDL.lean,Mathlib/LinearAlgebra/Matrix/Spectrum.lean,Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean,Mathlib/MeasureTheory/Measure/Haar/OfBasis.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,MathlibTest/EuclideanSpace.lean	24	50	['Paul-Lez', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	2-35204 2 days ago	2-35224 2 days ago	33-31560 33 days
24661	edegeltje author:edegeltje	feat(Tactic/Algebraize): Allow the `algebraize` tactic to use lemmas which don't (directly) mention RingHom	This PR allows the `algebraize` tactic to be applied in more cases. Specifically, in cases where the assumption is not (directly) about RingHom, it should still be able to apply lemmas. Written at the suggestion of @chrisflav , with the following example usecase: ```lean-4 import Mathlib open AlgebraicGeometry attribute [algebraize flat_of_flat] Flat -- pretend this is added where `AlgebraicGeometry.Flat` is defined lemma flat_of_flat {R S : Type u} [CommRing R] [CommRing S] (f : R →+* S) (h : Flat (Spec.map (CommRingCat.ofHom f))) : @Module.Flat R S _ _ f.toAlgebra.toModule := by have : f.Flat := sorry -- supposedly, this is true. ask christian. algebraize [f] assumption set_option tactic.hygienic false -- allow the tactic to produce accessible names for testing example {R S : Type u} [CommRing R] [CommRing S] (f : R →+* S) (h : Flat (Spec.map (CommRingCat.ofHom f))) : True := by algebraize [f] guard_hyp algebraizeInst : Module.Flat R S -- used to fail, succeeds now trivial ``` the key changes that makes this possible are the following: - a different way of making lemma/type applications, creating a term which can be added to the context - a different way of checking that the previously mentioned term actually relevant w/r/t the arguments provided to the tactic The previous check was ad-hoc and flimsy, making requirements of the precise order and the types of the arguments of lemmas or definitions, which resulted in the lemma being applicable in limited cases only. Now we still have some requirements, but these are less stringent. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author enhancement	147/62	Mathlib/Tactic/Algebraize.lean,MathlibTest/algebraize.lean	2	34	['callesonne', 'chrisflav', 'edegeltje', 'github-actions']	nobody	2-35124 2 days ago	2-35124 2 days ago	26-65389 26 days
25094	grunweg author:grunweg	feat(Tactic/Positivity): extend EReal support for numeric casts	Extend `pos_of_isNat` and `nonneg_of_isNat` to cover monoids which are not necessarily semirings, like EReal. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/.22Missing.20Tactics.22.20list/near/519660424) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	70/36	Mathlib/Tactic/Positivity/Core.lean,MathlibTest/positivity.lean	2	19	['Paul-Lez', 'YaelDillies', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	nobody	2-34924 2 days ago	2-34924 2 days ago	13-6021 13 days
23658	grunweg author:grunweg	feat: require that real or complex models with corners have convex interior	Follow-up to #18403. --- - [x] depends on: #23657 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-differential-geometry WIP	116/18	Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean	2	5	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'sgouezel']	nobody	2-31025 2 days ago	6-14472 6 days ago	0-9 9 seconds
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 - [ ] depends on: #24711 - [ ] depends on: #24686 - [ ] depends on: #24703 - [x] depends on: #24735 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-category-theory blocked-by-other-PR	709/26	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/CategoryTheory/Closed/Functor.lean,Mathlib/CategoryTheory/Closed/Monoidal.lean,Mathlib/CategoryTheory/Limits/Indization/FilteredColimits.lean,Mathlib/CategoryTheory/Limits/Preserves/Bifunctor.lean,Mathlib/CategoryTheory/Limits/Sifted.lean,Mathlib/CategoryTheory/Monoidal/Bimod.lean,Mathlib/CategoryTheory/Monoidal/Braided/Reflection.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct.lean,Mathlib/CategoryTheory/Monoidal/Internal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Limits/Basic.lean,Mathlib/CategoryTheory/Monoidal/Limits/Preserves.lean	14	9	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	2-30944 2 days ago	31-21619 1 month ago	33-11296 33 days
25549	yuma-mizuno author:yuma-mizuno	refactor(CategoryTheory/Monoidal): define `Mon_.Hom` using type class `IsMon_Hom`	This PR changes ```lean structure Mon_.Hom (M N : Mon_ C) where hom : M.X ⟶ N.X one_hom : η ≫ hom = η := by aesop_cat mul_hom : μ ≫ hom = (hom ⊗ hom) ≫ μ := by aesop_cat ``` to ```lean structure Mon_.Hom (M N : Mon_ C) where hom : M.X ⟶ N.X [is_mon_hom : IsMon_Hom hom] ``` and similarly for `Comon_.Hom`. The discussion on Zulip: [#mathlib4 > Refactoring Mod_? @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Refactoring.20Mod_.3F/near/522782252) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	209/173	Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/CategoryTheory/Monad/EquivMon.lean,Mathlib/CategoryTheory/Monoidal/Bimon_.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Comon_.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Mon_.lean,Mathlib/CategoryTheory/Monoidal/CommGrp_.lean,Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Comon_.lean,Mathlib/CategoryTheory/Monoidal/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Internal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Internal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/CategoryTheory/Monoidal/Internal/Types/Basic.lean,Mathlib/CategoryTheory/Monoidal/Mod_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Preadditive/CommGrp_.lean	16	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	2-30089 2 days ago	2-79904 2 days ago	2-79948 2 days
18725	joelriou author:joelriou	feat(LinearAlgebra): generators of pi tensor products	--- - [x] depends on: #18534 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-algebra WIP label:t-algebra$	252/4	Mathlib.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean,Mathlib/SetTheory/Cardinal/Finite.lean	8	5	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	2-26878 2 days ago	22-31165 22 days ago	0-0 0 seconds
24809	robin-carlier author:robin-carlier	feat(CategoryTheory/Functor/KanExtension): preservations of Kan extensions	Introduce a typeclass `G.PreservesLeftKanExtension F L` that asserts that a functor `G` preserves the left Kan extension of `F` along a functor `L`. Introduce a pointwise variant, and relate it to the non-pointwise version when pointwise extensions exist. Show that a functor that preserves the relevant colimits preserve pointwise left Kan extensions. Construct isomorphisms `L.leftKanExtension F ⋙ G ≅ L.leftKanExtension (F ⋙ G)` when `G.PreservesLeftKanExtension F L` holds. Also construct a functorial version, as an isomorphism `L.lan ⋙ (whiskeringRight _ _ _).obj G ≅ (whiskeringRight _ _ _).obj G ⋙ L.lan`. All results are dualised to right Kan extensions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	551/0	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Functor/KanExtension/Preserves.lean	3	5	['TwoFX', 'github-actions', 'joelriou', 'robin-carlier']	nobody	2-25051 2 days ago	28-28334 28 days ago	28-28383 28 days
18285	callesonne author:callesonne	feat(Bicategory/Grothendieck): functoriality of the grothendieck construction	This PR is the start towards proving functoriality of the Grothendieck construction. --- - [x] depends on: #18252 - [x] depends on: #18253 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	150/13	Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/Grothendieck.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean,Mathlib/CategoryTheory/Category/Cat.lean	4	n/a	['callesonne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	2-21881 2 days ago	unknown	unknown
24578	b-mehta author:b-mehta	feat(Pointwise): cardinality of product set in GroupWithZero	This PR: * generalises the assumptions to `card_le_card_image₂_left` and `card_le_card_image₂_right` and golf these: they previously required injectivity everywhere despite using it in only one place. (These lemmas were also used in exactly one place each in mathlib) * adds `card_le_card_mul_left_of_injective` and `card_le_card_mul_right_of_injective` which generalise the typeclass assumptions on the existing `card_le_card_mul_left` and `card_le_card_mul_right` * uses the above to add versions of `card_le_card_mul_left` and `card_le_card_mul_right` in groups with zero. This is useful for applying the pointwise constructions to fields In fact, the first versions of all the above lemmas were written in this generality, but that was seemingly lost during an upstream. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	54/16	Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/GroupWithZero/Pointwise/Finset.lean,Mathlib/Data/Finset/NAry.lean	3	1	['github-actions']	mariainesdff assignee:mariainesdff	2-20790 2 days ago	32-33368 1 month ago	36-70971 36 days
18254	callesonne author:callesonne	feat(Bicategory/Modification/Pseudo): define modifications between strong natural transformations of pseudofunctors	This PR adds modifications between strong natural transformations of pseudofunctors. At the same time, it improves the existing code on modifications between oplax natural tranformations of oplax functors (by removing some simp lemmas). --- - [x] depends on: #18250 - [x] depends on: #18252 - [x] depends on: #18253 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	295/60	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Modification/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean	5	12	['callesonne', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	2-17800 2 days ago	2-17807 2 days ago	24-8616 24 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/)	t-meta	312/185	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/RingTheory/AlgebraicIndependent/TranscendenceBasis.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Push.lean,Mathlib/Tactic/Push/Attr.lean,MathlibTest/push_neg.lean,scripts/noshake.json	11	9	['JovanGerb', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant']	robertylewis assignee:robertylewis	2-17362 2 days ago	2-17387 2 days ago	110-71073 110 days
25338	wwylele author:wwylele	feat(GroupTheory): add divisible completion	This is part of #25140. In order to "decompose" a linearly ordered group by its Archimedean classes, it needs to be embedded in a divisible group first. This code prepares for that embedding. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	372/0	Mathlib.lean,Mathlib/GroupTheory/DivisibleCompletion.lean	2	1	['github-actions']	nobody	2-12682 2 days ago	2-12682 2 days ago	0-0 0 seconds
25543	FrankieNC author:FrankieNC	feat(MeasureTheory/Measure): bound Hausdorff measure under orthogonal projection	Formalisation that Hausdorff measure is non-increasing under orthogonal projection onto a finite-dimensional Euclidean subspace. This includes: * a bound on the norm of orthogonal projections; * a proof that orthogonal projection is 1-Lipschitz; * the main result: the `s`-dimensional Hausdorff measure of the projection of a set is less than or equal to that of the original set. This formalises Lemma 3.5 from Julian Fox’s REU paper: Besicovitch Sets, Kakeya Sets, and Their Properties, UChicago REU, 2021. --- Footer _No breaking changes._ --- Dependencies _None._ --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability	43/2	Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean	2	9	['b-mehta', 'github-actions']	nobody	2-11991 2 days ago	2-79905 2 days ago	3-6633 3 days
25331	fbarroero author:fbarroero	feat(RingTheory/Ideal/Maximal): `ne_top_iff_exists_maximal`	We add `Ideal.ne_top_iff_exists_maximal` and an analogous statement for `IsDedekindDomain.HeightOneSpectrum`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	18/0	Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/Ideal/Maximal.lean	2	5	['Ruben-VandeVelde', 'fbarroero', 'github-actions']	nobody	2-7027 2 days ago	9-18489 9 days ago	9-18541 9 days
14089	callesonne author:callesonne	feat(Bicategory/Functorbicategory): define bicategory of pseudofunctors	This PR contains a definition of the bicategory of pseudofunctors, in the file `Bicategory/FunctorBicategory/Pseudo.lean`. It also moves the file `Bicategory/Functorbicategory.lean` to `Bicategory/FunctorBicategory/Oplax.lean`. --- - [x] depends on: #14028 - [x] depends on: #18250 - [x] depends on: #18252 - [x] depends on: #18253 - [ ] depends on: #18254 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	385/70	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Oplax.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Modification/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean	7	5	['callesonne', 'github-actions', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	nobody	2-4615 2 days ago	2-5993 2 days ago	9-2320 9 days
23929	meithecatte author:meithecatte	feat(Computability/NFA): improve bound on pumping lemma	--- - [x] depends on: #25321 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor	101/10	Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean	2	41	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'meithecatte']	nobody	2-1067 2 days ago	2-1068 2 days ago	34-10595 34 days
25089	Bergschaf author:Bergschaf	feat(Order/Sublocale): definition of sublocales	There are several possible definition of sublocales. I used one from [nlab](https://ncatlab.org/nlab/show/sublocale) which states that a sublocale is a subset of a locale which is closed under all meets and for any ∈ S and x ∈ X, we have x ⇨ s ∈ S. This PR also includes an order isomorphism between (Nucleus)ᵒᵈ and Sublocale. --- I am open to better name suggestions for the order isomorphism. - [x] depends on: #24941 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-order	265/8	Mathlib.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/Nucleus.lean,Mathlib/Order/Sublocale.lean,Mathlib/Order/Synonym.lean,docs/references.bib	6	71	['Bergschaf', 'YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'xhalo32']	nobody	2-955 2 days ago	2-955 2 days ago	15-66778 15 days
25501	eric-wieser author:eric-wieser	fix: eliminate metadata in linarith	Otherwise this interferes with the `answer()` elaborator from formal-conjectures. Diagnosed using #25500. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta delegated bug	7/1	Mathlib/Tactic/Linarith/Parsing.lean,MathlibTest/linarith.lean	2	8	['adomani', 'b-mehta', 'github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors']	nobody	1-85708 1 day ago	2-1462 2 days ago	1-78612 1 day
25350	thorimur author:thorimur	feat: add autoparams for proof fields of `Equiv`	This PR adds the simple autoparam `by intro; first \| rfl \| ext <;> rfl` for the fields `left_inv`, `right_inv` of `Equiv`, and removes explicit terms in favor of the autoparam across mathlib in many (but possibly not all) applicable cases. It also adds the same autoparam to the corresponding fields of `LieEquiv` for parity (which is used nontrivially in `LieSubalgebra.topEquiv` in `Mathlib.Algebra.Lie.Submodule`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	39/653	Counterexamples/AharoniKorman.lean,Mathlib/Algebra/AddConstMap/Equiv.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Spectrum/Pi.lean,Mathlib/Algebra/Algebra/Spectrum/Quasispectrum.lean,Mathlib/Algebra/Category/CommAlgCat/Basic.lean,Mathlib/Algebra/Category/Grp/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/ChangeOfRings.lean,Mathlib/Algebra/DualQuaternion.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/Group/AddChar.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Equiv/Opposite.lean,Mathlib/Algebra/Group/Equiv/TypeTags.lean,Mathlib/Algebra/Group/Pi/Units.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Submonoid/Units.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Algebra/Group/TypeTags/Hom.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/Algebra/Group/Units/Opposite.lean,Mathlib/Algebra/Group/WithOne/Basic.lean,Mathlib/Algebra/GroupWithZero/Action/Center.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/GroupWithZero/Units/Equiv.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Homology/ComplexShapeSigns.lean,Mathlib/Algebra/Homology/Square.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/Character.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/Presentation/DirectSum.lean,Mathlib/Algebra/Module/Presentation/Tautological.lean,Mathlib/Algebra/Module/Submodule/Equiv.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/ZMod.lean,Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/Algebra/Order/Ring/Idempotent.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Module/AEval.lean,Mathlib/Algebra/Quandle.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/Ring/Opposite.lean,Mathlib/Algebra/Ring/Prod.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/AlgebraicGeometry/PointsPi.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/Nerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/Analysis/BoxIntegral/Partition/Filter.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Group/Hom.lean,Mathlib/Analysis/Normed/Group/SeparationQuotient.lean,Mathlib/Analysis/Normed/Lp/LpEquiv.lean,Mathlib/Analysis/NormedSpace/Alternating/Basic.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/CategoryTheory/Category/Bipointed.lean,Mathlib/CategoryTheory/Category/Cat/Adjunction.lean,Mathlib/CategoryTheory/Category/Pointed.lean,Mathlib/CategoryTheory/Category/TwoP.lean,Mathlib/CategoryTheory/CodiscreteCategory.lean,Mathlib/CategoryTheory/CofilteredSystem.lean,Mathlib/CategoryTheory/Comma/Arrow.lean,Mathlib/CategoryTheory/Comma/CardinalArrow.lean,Mathlib/CategoryTheory/Endomorphism.lean,Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/Functor/FunctorHom.lean,Mathlib/CategoryTheory/Functor/TwoSquare.lean,Mathlib/CategoryTheory/GradedObject/Trifunctor.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/CategoryTheory/Limits/Preserves/Ulift.lean,Mathlib/CategoryTheory/Limits/Shapes/SingleObj.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/CategoryTheory/Limits/Types/Yoneda.lean,Mathlib/CategoryTheory/Localization/Construction.lean,Mathlib/CategoryTheory/Localization/Resolution.lean,Mathlib/CategoryTheory/Monad/Monadicity.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Sites/Sheaf.lean,Mathlib/CategoryTheory/Sites/SheafHom.lean,Mathlib/CategoryTheory/Yoneda.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/Quiver/Basic.lean	219	11	['JovanGerb', 'adomani', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'thorimur']	nobody	1-85034 1 day ago	2-1832 2 days ago	3-58230 3 days
25480	ocfnash author:ocfnash	feat: define a concrete model of the `𝔤₂` root system	This is a bit of an experiment to test API but it should also make it easier to prove some properties of `𝔤₂`. --- - [x] depends on: #25477 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra WIP label:t-algebra$	50/0	Mathlib/LinearAlgebra/RootSystem/Finite/G2.lean	1	7	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'ocfnash']	nobody	1-84505 1 day ago	1-84523 1 day ago	0-1 1 second
25565	robin-carlier author:robin-carlier	feat(CategoryTheory/Bicategory/NaturalTransformations): strong and lax natural transformations of lax functors	Given two lax functors `F G` between bicategories, we define lax natural transformations as families of 1-morphisms `∀ a : B, F.obj a ⟶ G.obj a` equipped with a naturality 2-cell `∀ {a b : B} (f : a ⟶ b), app a ≫ G.map f ⟶ F.map f ≫ app b` that are required to satisfy conditions such as naturality, and compatibility with the `mapId` and `mapComp` fields of the source and target functors. This notion dualizes the existing notion of oplax natural transformations between, and tries to narrow the current gap between lax and oplax functors in the library, where the latter has much more formalized API. For maintainability, The code tries to stay as aligned as possible with the code in `CategoryTheory.Bicategory.Naturaltransformations.Oplax`. --- I followed the book by Johnson and Yau for the definition. I made @yuma-mizuno and @callesonne authors of the files, as they are the authors of the original code for Oplax functors, which I basically copy-pasted and modified to make it work with lax functors. They should feel free to modify this if they want. Next thing on the list is to tackle modifications between lax/strong natural transforms of lax transforms, as well as the category instance on lax functors. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	286/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Lax.lean,scripts/noshake.json	3	13	['callesonne', 'github-actions', 'robin-carlier', 'yuma-mizuno']	nobody	1-72993 1 day ago	1-77544 1 day ago	2-12525 2 days
25575	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): ext for walks based on `getVert` and `support`	Two walks are the same if they agree under `getVert` or `support`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	43/0	Mathlib/Combinatorics/SimpleGraph/Walk.lean	1	6	['Rida-Hamadani', 'b-mehta', 'github-actions']	nobody	1-64605 1 day ago	1-65815 1 day ago	1-69165 1 day
25495	adomani author:adomani	chore: use non-deprecated function in bench_summary	Discovered while investigating why the bot has been failing recently: this will likely not fix the bot, but should be updated anyway! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		1/1	scripts/bench_summary.lean	1	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	1-50302 1 day ago	4-9243 4 days ago	4-12357 4 days
25481	kbuzzard author:kbuzzard	chore: refactor Algebra.TensorProduct.rightAlgebra	The declaration `Algebra.TensorProduct.rightAlgebra` makes `A ⊗[R] B` into a `B`-algebra (here `R` is a `CommSemiring`, `A` is a `Semiring` and an `R`-algebra, and `B` is a `CommSemiring` and an `R`-algebra). It is not an instance because if A = B it causes a diamond. However in the many cases where A isn't B, it can occasionally be useful. However one could imagine that in the many cases where an R-module `M` also isn't `B`, it might occasionally be useful to make `M ⊗[R] B` into a `B`-module (and indeed I am finding this in FLT). With the current definition of `Algebra.TensorProduct.rightAlgebra` this is difficult to do without causing diamonds in the case when `M` happens to be an `R`-algebra (by which I mean "I failed to do this in finite time"). One fix for this is just to redefine `Algebra.TensorProduct.rightAlgebra` so that the `smul` field is ``` smul b ab := TensorProduct.comm _ _ _ (b • (TensorProduct.comm _ _ _ ab)) ``` i.e. literally "swap the product around, use mathlib's instance making `B ⊗[R] A` into a `B`-algebra, and then swap back". Then the same definition can be used to make `M ⊗[R] B` into a `B`-module and on the odd occasion where this point of view is useful, there is no diamond. This is what we do in this PR. After adding one simp lemma there is no breakage at all in mathlib. Furthermore, for those who have observed that we want to build on this algebra instance sometimes and, for example, add instances of the form "if M is finite over R then M ⊗[R] B is finite over B" -- these instances are really easy to add now with this new definition, because you simply pull back the analogous finite left module instance along the isomorphism M ⊗[R] B = B ⊗[R] M. Examples (from FLT, where the right action is put in a scope): ``` scoped instance [Module.Finite R M] : Module.Finite A (M ⊗[R] A) := Module.Finite.equiv (Module.TensorProduct.comm R A M) scoped instance [Module.Free R M] : Module.Free A (M ⊗[R] A) := Module.Free.of_equiv (Module.TensorProduct.comm R A M) ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	33/6	Mathlib/RingTheory/TensorProduct/Basic.lean	1	4	['github-actions', 'kbuzzard', 'leanprover-bot']	nobody	1-43742 1 day ago	4-23289 4 days ago	4-23547 4 days
24149	YaelDillies author:YaelDillies	refactor(Convex/Cone): reorder, streamline	The current library on cones is very centered around normed and Hilbert spaces. This is inconvenient for us in Toric where we have two spaces $M$, and $N$ that are non-canonically isomorphic to $ℐ R^n$ (for the same $n$). Although we could identify $M$ and $N$ with $ℐ R^n$ and get an inner product on $M = N = ℐ R^n$ this way, we would lose the contravariance (resp. covariance) of $M$ (resp. $N$) in the group scheme that indexes them. We would instead like to have results that apply to perfect pairings $p : M → N → ℐ R$ out of the box. Not all the theory can be generalised, of course. So, in terms of file structure, we need to draw the line somewhere. We propose to draw it at the import of `NormedAddCommGroup`, as this is the time where the scalars suddenly get fixed to the reals, instead of an arbitrary ordered ring. This line passes through individual files, which therefore need to be split. We operate this separation by moving the cone content that doesn't require a norm under a new folder `Geometry.Convex.Cone`. The content that does require it stays in `Analysis.Convex.Cone`. A similar operation could be performed for the rest of the `Analysis.Convex`, but it seems wiser to do so simultaneously with the convexity refactor. Changes performed include: * Renaming the variable `𝕜` to `R` when it is merely a ring * Splitting files according to normless normful parts * Completing the existing APIs * Redefining `ProperCone R M` as an `abbrev` for `ClosedSubmodule R≥0 M`, similarly to how `PointedCone R M` is an `abbrev` for `Submodule R≥0 M`. * Replacing the three dual cones definitions we have: * `Set.innerDualCone : Set H → ConvexCone ℝ H` * `PointedCone.dual : PointedCone ℝ H → PointedCone ℝ H` * `ProperCone.dual : ProperCone ℝ H → ProperCone ℝ H` by three new ones: * `PointedCone.dual : Set M → PointedCone R N` for a bilinear pairing `p : M →ₗ[R] N →ₗ[R] R` * `ProperCone.dual : Set M → ProperCone R N` for a continuous perfect pairing `p : M →ₗ[R] N →ₗ[R] R` * `ProperCone.innerDual : Set H → ProperCone ℝ H` for an inner product space `H` From Toric --- - [x] depends on: #24229 - [x] depends on: #24230 - [x] depends on: #24231 - [x] depends on: #24232 - [x] depends on: #24233 - [x] depends on: #24234 - [x] depends on: #24235 - [x] depends on: #24236 - [x] depends on: #24237 - [ ] depends on: #24304 - [ ] depends on: #25204 - [ ] depends on: #25251 - [x] depends on: #25252 - [ ] depends on: #25292 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed toric large-import new-contributor t-analysis blocked-by-other-PR	1072/909	Mathlib.lean,Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Analysis/Convex/Cone/Closure.lean,Mathlib/Analysis/Convex/Cone/Dual.lean,Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Analysis/Convex/Cone/Pointed.lean,Mathlib/Analysis/Convex/Cone/Proper.lean,Mathlib/Analysis/Convex/Cone/README.md,Mathlib/Geometry/Convex/Cone/Basic.lean,Mathlib/Geometry/Convex/Cone/Dual.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean,Mathlib/Geometry/Convex/Cone/README.md,Mathlib/Topology/Algebra/Module/PerfectPairing.lean	14	13	['YaelDillies', 'github-actions', 'justus-springer', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	1-43736 1 day ago	1-43754 1 day ago	1-83310 1 day
25558	kbuzzard author:kbuzzard	chore: split Mathlib/Topology/Algebra/RestrictedProduct	`Mathlib/Topology/Algebra/RestrictedProduct.lean` is over 1000 lines and we have over 500 lines more of restricted product API in FLT with more to come, so I thought I would split sooner rather than later. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This PR is nothing more than a split with no additions or deletions.	file-removed t-topology	408/360	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/RestrictedProduct/Basic.lean,Mathlib/Topology/Algebra/RestrictedProduct/TopologicalSpace.lean,scripts/noshake.json	5	4	['eric-wieser', 'github-actions', 'grunweg', 'kbuzzard']	nobody	1-43081 1 day ago	2-39635 2 days ago	2-39689 2 days
25563	Komyyy author:Komyyy	chore: move `Topology.StoneCech` into `Topology.Compactification` (1/2)	At present, the `Topology.Compactification` directory includes results on one-point compactifications, but results on Stone-Čech compactifications are currently located elsewhere. The removed file `Topology.Compactification` is deprecated in another PR (#25583) to leave a good git diff history. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed maintainer-merge t-topology	9/9	Mathlib.lean,Mathlib/Combinatorics/Hindman.lean,Mathlib/Topology/Category/CompHaus/Basic.lean,Mathlib/Topology/Category/CompHaus/Projective.lean,Mathlib/Topology/Category/Profinite/Projective.lean,Mathlib/Topology/Category/Stonean/Adjunctions.lean,Mathlib/Topology/Compactification/StoneCech.lean,Mathlib/Topology/ExtremallyDisconnected.lean,Mathlib/Topology/Maps/Proper/UniversallyClosed.lean,Mathlib/Topology/Separation/CompletelyRegular.lean	10	4	['Komyyy', 'github-actions', 'grunweg']	nobody	1-42111 1 day ago	1-42111 1 day ago	2-17644 2 days
25561	callesonne author:callesonne	feat(Category/Grpd): define the bicategory of groupoids	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	179/25	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Category/Grpd.lean	6	4	['callesonne', 'github-actions', 'robin-carlier']	nobody	1-41265 1 day ago	1-85841 1 day ago	2-19997 2 days
24330	Paul-Lez author:Paul-Lez	chore(Data/Nat/Factorization/Basic): minimize dependencies	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data WIP	123/103	Mathlib.lean,Mathlib/Algebra/Order/Antidiag/Nat.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/Defs.lean,Mathlib/Data/Nat/Factorization/LCM.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/GroupTheory/Exponent.lean,Mathlib/NumberTheory/Cyclotomic/PrimitiveRoots.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean	9	5	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant']	YaelDillies assignee:YaelDillies	1-40316 1 day ago	1-43556 1 day ago	0-0 0 seconds
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	113/20	Mathlib/Data/Set/Insert.lean,Mathlib/Order/Atoms.lean,Mathlib/Order/CompactlyGenerated/Basic.lean	3	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	1-39562 1 day ago	1-39585 1 day ago	0-15 15 seconds
24384	joelriou author:joelriou	feat(CategoryTheory): pseudofunctors to Cat	We specialize the API from PR #24382 to the case of pseudofunctors to `Cat`. Co-authored-by: Christian Merten [christian@merten.dev](mailto:christian@merten.dev) --- - [ ] depends on: #24382 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author blocked-by-other-PR	359/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Cat.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean	3	5	['callesonne', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-36291 1 day ago	1-75906 1 day ago	0-29 29 seconds
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 t-algebra label:t-algebra$	251/185	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/NumberTheory/ModularForms/CongruenceSubgroups.lean,Mathlib/RingTheory/Ideal/Quotient/Index.lean	14	22	['Ruben-VandeVelde', 'TwoFX', 'YaelDillies', 'alreadydone', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'loefflerd', 'madvorak', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	1-34509 1 day ago	1-34662 1 day ago	129-18967 129 days
24913	YaelDillies author:YaelDillies	feat: if `p = a * b` is irreducible, then `a = 1` or `b = 1`	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	7/3	Mathlib/Algebra/Group/Irreducible/Defs.lean	1	6	['Ruben-VandeVelde', 'YaelDillies', 'b-mehta', 'github-actions']	nobody	1-34407 1 day ago	1-34467 1 day ago	25-40714 25 days
25579	JovanGerb author:JovanGerb	feat(Order/Notation): only allow ⊔/⊓ for non-linear orders	⊔/⊓ is the same as max/min. The difference is that it is meant to be used if and only if there is no linear order. This PR implements a check for one of the two directions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	33/7	Mathlib/Order/Notation.lean	1	1	['github-actions']	nobody	1-34175 1 day ago	1-63111 1 day ago	0-0 0 seconds
25580	Parcly-Taxel author:Parcly-Taxel	chore: deprime `induction` in `AlgebraicTopology/CategoryTheory`	Most replacements that are also in #23676 have been copied over, but some have been optimised further.	tech debt	134/125	Mathlib/AlgebraicTopology/DoldKan/Decomposition.lean,Mathlib/AlgebraicTopology/DoldKan/Degeneracies.lean,Mathlib/AlgebraicTopology/DoldKan/NCompGamma.lean,Mathlib/AlgebraicTopology/DoldKan/Projections.lean,Mathlib/AlgebraicTopology/SimplexCategory/MorphismProperty.lean,Mathlib/AlgebraicTopology/SimplicialObject/Split.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/EnoughInjectives.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/Subobject.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/Extensive.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Galois/Decomposition.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/SequentialProduct.lean,Mathlib/CategoryTheory/Limits/Types/Colimits.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Quotient.lean,Mathlib/CategoryTheory/Sites/Sheaf.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/CategoryTheory/Triangulated/TStructure/Basic.lean	28	3	['Parcly-Taxel', 'eric-wieser', 'github-actions']	nobody	1-30932 1 day ago	1-57008 1 day ago	1-56994 1 day
25174	zcyemi author:zcyemi	feat(Geometry/Euclidean/Triangle): add law of sines	--- Implement the vector and angle-at-point forms of the law of sines. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-euclidean-geometry	57/1	Mathlib/Geometry/Euclidean/Triangle.lean	1	15	['eric-wieser', 'github-actions', 'jsm28', 'zcyemi']	nobody	1-29741 1 day ago	15-50897 15 days ago	15-50951 15 days
25578	peakpoint author:peakpoint	refactor(Geometry/Euclidean/Projection): redefine projection and reflection for affine subspaces	--- The coersion stuff is just copied from `Analysis/Normed/Operator/LinearIsometry`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-euclidean-geometry	479/448	Mathlib.lean,Mathlib/Analysis/Normed/Affine/ContinuousAffineMap.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Geometry/Euclidean/Altitude.lean,Mathlib/Geometry/Euclidean/Circumcenter.lean,Mathlib/Geometry/Euclidean/Projection.lean,Mathlib/Geometry/Euclidean/SignedDist.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Projection.lean	8	2	['github-actions', 'jsm28']	nobody	1-29273 1 day ago	1-64573 1 day ago	1-64569 1 day
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). --- - [ ] depends on: #25587 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-CI blocked-by-other-PR	552/667	Mathlib.lean,Mathlib/CategoryTheory/Category/RelCat.lean,Mathlib/Combinatorics/Hall/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Data/PFun.lean,Mathlib/Data/Rel.lean,Mathlib/Order/Filter/Partial.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/Rel/GaloisConnection.lean,Mathlib/Order/RelSeries.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/Entourage.lean	14	20	['ADedecker', 'PatrickMassot', 'YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	1-27151 1 day ago	1-27700 1 day ago	43-40011 43 days
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 awaiting-CI blocked-by-other-PR	943/788	Mathlib.lean,Mathlib/CategoryTheory/Category/RelCat.lean,Mathlib/Combinatorics/Hall/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Data/PFun.lean,Mathlib/Data/Rel.lean,Mathlib/Dynamics/TopologicalEntropy/CoverEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Dynamics/TopologicalEntropy/NetEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/Semiconj.lean,Mathlib/Order/Filter/Partial.lean,Mathlib/Order/JordanHolder.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/Rel/GaloisConnection.lean,Mathlib/Order/RelSeries.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Finiteness.lean,Mathlib/RingTheory/Length.lean,Mathlib/RingTheory/Spectrum/Prime/LTSeries.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	30	15	['D-Thomine', 'YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	1-27004 1 day ago	1-27020 1 day ago	1-52822 1 day
25583	Komyyy author:Komyyy	style: move `Topology.StoneCech` into `Topology.Compactification` (2/2)	This file deprecates the removed file `Topology.Compactification`. This PR is split from #25563 to leave a good git diff history. --- For reviewers: It's welcome to merge master after #25563 is merged. - [ ] depends on: #25563 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	405/393	Mathlib.lean,Mathlib/Combinatorics/Hindman.lean,Mathlib/Topology/Category/CompHaus/Basic.lean,Mathlib/Topology/Category/CompHaus/Projective.lean,Mathlib/Topology/Category/Profinite/Projective.lean,Mathlib/Topology/Category/Stonean/Adjunctions.lean,Mathlib/Topology/Compactification/StoneCech.lean,Mathlib/Topology/ExtremallyDisconnected.lean,Mathlib/Topology/Maps/Proper/UniversallyClosed.lean,Mathlib/Topology/Separation/CompletelyRegular.lean,Mathlib/Topology/StoneCech.lean	11	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-22243 1 day ago	1-42718 1 day ago	0-1 1 second
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	2	['Timeroot', 'github-actions']	fpvandoorn assignee:fpvandoorn	1-19362 1 day ago	70-16572 2 months ago	70-16623 70 days
23858	xroblot author:xroblot	feat(NumberField/CMField): All CM-extensions come from the real maximal subfield	Main result: if `K/F` is a CM-extension then `F` is isomorphic to the maximal real subfield of `K` --- - [x] depends on: #23760 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	113/6	Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/LinearAlgebra/Dimension/Finrank.lean,Mathlib/NumberTheory/NumberField/CMField.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	1-17525 1 day ago	2-32914 2 days ago	2-33897 2 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	58	['eric-wieser', 'girving', 'github-actions', 'quangvdao', 'tomaz1502']	nobody	1-15090 1 day ago	138-13504 4 months ago	138-13495 138 days
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. --- - [x] depends on: #24142 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	159/0	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/Adjunction.lean,docs/references.bib	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	adamtopaz assignee:adamtopaz	1-14703 1 day ago	22-81104 22 days ago	22-81087 22 days
25595	joelriou author:joelriou	feat(CategoryTheory/Bicategory): more compatibilities for mates	This PR shows some additional compatibilities for mates in bicategories. It shall be used in the construction of the bicategory of adjunctions in a bicategory #13539. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	103/0	Mathlib/CategoryTheory/Bicategory/Adjunction/Mate.lean	1	1	['github-actions']	nobody	1-13757 1 day ago	1-13831 1 day ago	1-13817 1 day
13539	joelriou author:joelriou	feat: the bicategory of adjunctions in a bicategory	--- - [x] depends on: #24982 - [ ] depends on: #25595 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	336/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Adj.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Mate.lean	3	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	nobody	1-13273 1 day ago	1-13274 1 day ago	1-18200 1 day
24382	joelriou author:joelriou	feat(CategoryTheory): pseudofunctors from strict bicategories	This PR provides an API for pseudofunctors `F` from a strict bicategory `B`. In particular, this shall apply to pseudofunctors from locally discrete bicategories. We first introduce more flexible variants of `mapId` and `mapComp`: for example, if `f` and `g` are composable morphisms and `fg` is such that `h : fg = f ≫ f`, we provide an isomorphism `F.mapComp' f g fg h : F.map fg ≅ F.map f ≫ F.map g`. We study the compatibilities of these isomorphisms with respect to composition with identities and associativity. Secondly, given a commutative square `t ≫ r = l ≫ b` in `B`, we construct an isomorphism `F.map t ≫ F.map r ≅ F.map l ≫ F.map b`. Co-authored-by: Christian Merten --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-category-theory	168/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean	3	17	['callesonne', 'erdOne', 'github-actions', 'joelriou']	nobody	1-12557 1 day ago	1-78341 1 day ago	44-5911 44 days
25593	YaelDillies author:YaelDillies	refactor(RelCat): use a type synonym for homs	This improves automation and follows the new pattern for concrete categories (although `RelCat` is not a concrete category). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	40/52	Mathlib/CategoryTheory/Category/RelCat.lean	1	10	['YaelDillies', 'eric-wieser', 'github-actions']	nobody	1-10565 1 day ago	1-14706 1 day ago	1-14763 1 day
23555	Komyyy author:Komyyy	feat(Mathlib/GroupTheory/SpecificGroups/Alternating): A_n is simple iff n = 3 or 5 ≤ n	--- For reviewers: This PR is large. Please don't hesitate to let me know if you'd prefer it to be split. - [x] depends on: #25299 - [x] depends on: #25314 - [x] depends on: #25367 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	300/31	Mathlib/Algebra/Group/End.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/SpecificGroups/KleinFour.lean,Mathlib/GroupTheory/Subgroup/Simple.lean	4	11	['AntoineChambert-Loir', 'Komyyy', 'acmepjz', 'ajirving', 'github-actions', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	1-10503 1 day ago	1-10503 1 day ago	3-21376 3 days
25587	YaelDillies author:YaelDillies	refactor: make `Rel` less see-through	There is tension throughout the library between considering relations between `α` and `β` simply as `α → β → Prop`, or as a bundled object `Rel α β` with dedicated operations and API. The former approach is used almost everywhere as it is very lightweight and has arguably native support from core Lean features, but it cracks at the seams whenever one starts talking about operations on relations. For example: * composition of relations `R : α → β → Prop`, `S : β → γ → Prop` is the unwieldy `Relation.Comp R S := fun a c ↦ ∃ b, R a b ∧ S b c` * map of a relation `R : α → β → Prop`, under `f : α → γ`, `g : β → δ` is the monstruous `Relation.map R f g := fun c d ↦ ∃ a b, r a b ∧ f a = c ∧ g b = d`. The latter approach is embodied by the existing type `Rel α β`, with dedicated notation like `○` for composition. It makes it much easier to reason about operations relations, but currently its API suffers from the leakage of its definition as ``` def Rel (α β : Type) := α → β → Prop ``` The fact that `Rel` isn't an `abbrev` confuses automation. But simply making it an `abbrev` would kill the point of having a separate less see-through type to perform relation operations on. A final point, and the original motivation for this refactor, is that uniform spaces need a theory of relations on a type `α` as elements of `Set (α × α)`. This cannot be worked around, since `Set (α × α)` is the type of elements of a filter on `α × α`. This theory is already developed in `Topology.UniformSpace.Defs`, and duplicates the existing `Rel` material. This PR is a proposal to refactor `Rel` to be less see-through by redefining it as ``` abbrev Rel (α β : Type) := Set (α × β) ``` This has several advantages: * The use of `α × β` means that one can't abuse the defeq of `Rel α β` with the function type `α → β → Prop`. * Instead, we get to provide an explicit notation `a ~[R] b` that very closely follows the paper convention `a ~R b` of using relations as infixes. This notation is scoped to the `Rel` namespace. * The use of `Set` is an extra layer of indirection to avoid automation confusing `Rel α β` with `α × β → Prop`. * It can directly be used in the theory of uniform spaces because of the syntactic equality between `Rel α α` and `Set (α × α)`. * A relation can still be defined from an explicit function `α → β → Prop`, with nice notation: What was previously `fun a b ↦ R a b` becomes `{(a, b) \| R a b}`. * In general, fallout is manageably small and easily fixed by inserting the `{(a, b) \| R a b}` and `a ~[R] b` notations. The benefits can be seen in places like `CategoryTheory.Category.RelCat` where automation is significantly improved, or `Combinatorics.Hall.Basic` where defeq abuse is avoided and dot notation becomes available. --- - [ ] depends on: #25593 I will add deprecations once CI passes and people agree this is a step forward. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data RFC blocked-by-other-PR	391/471	Mathlib/CategoryTheory/Category/RelCat.lean,Mathlib/Combinatorics/Hall/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Data/PFun.lean,Mathlib/Data/Rel.lean,Mathlib/Order/Filter/Partial.lean,Mathlib/Order/JordanHolder.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/Rel/GaloisConnection.lean,Mathlib/Order/RelSeries.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Finiteness.lean,Mathlib/RingTheory/Length.lean,Mathlib/RingTheory/Spectrum/Prime/LTSeries.lean	15	4	['YaelDillies', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-10160 1 day ago	1-13471 1 day ago	0-10145 2 hours
22834	joelriou author:joelriou	feat(CategoryTheory): lifting properties and parametrized adjunctions	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.) --- - [x] depends on: #22828 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	309/0	Mathlib.lean,Mathlib/CategoryTheory/LiftingProperties/Basic.lean,Mathlib/CategoryTheory/LiftingProperties/ParametrizedAdjunction.lean	3	10	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	1-9993 1 day ago	17-77605 17 days ago *	17-77596 17 days *
25596	Komyyy author:Komyyy	feat: the Riemann zeta function is meromorphic (1/2)	This PR just renames a file to make the git diff in PR #25597 cleaner. --- This PR renames the file `Analysis.Meromorphic.Gamma` to `Analysis.Meromorphic.Complex` without deprecating the original file, but I think this is fine since it was only added yesterday. - [ ] depends on: #25600 (#25600 isn't depended directly, but this PR shouldn't be merged before ready to merge #25597.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-analysis blocked-by-other-PR	1/1	Mathlib.lean,Mathlib/Analysis/Meromorphic/Complex.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-9056 1 day ago	1-9186 1 day ago	0-1463 24 minutes
25597	Komyyy author:Komyyy	feat: the Riemann zeta function is meromorphic (2/2)	Also proves that the Hurwitz zeta function is meromorphic. This PR is split from #25596 to leave a good git diff history. --- The PR #25596 renames the file `Analysis.Meromorphic.Gamma` to `Analysis.Meromorphic.Complex` without deprecating the original file, but I think this is fine since it was only added yesterday. For reviewers: It's welcome to merge master after #25596 is merged. - [ ] depends on: #25596 - [ ] depends on: #25600 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-analysis blocked-by-other-PR	72/23	Mathlib.lean,Mathlib/Analysis/Meromorphic/Complex.lean,Mathlib/Analysis/Meromorphic/Gamma.lean,Mathlib/Topology/ContinuousOn.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-8406 1 day ago	1-9122 1 day ago	0-91 1 minute
24541	pfaffelh author:pfaffelh	feat(Topology/Compactness/CompactSystem): introduce compact Systems	A compact system is a set systems with the property that, whenever a countable intersections of sets in the set system is empty, there is a finite subset of sets with empty intersection. These are needed e.g. in measure theory if one wants to show sigma-additivity of a set function on a ring. * Main result: The set of sets which are either compact and closed, or `univ`, is a compact system. * Introduce `Dissipate s x := ⋂ y ≤ x, s y` (Data/Set/Dissipate), which is parallel to Data/Set/Accumulate. Co-authored-by: Rémy Degenne remydegenne@gmail.com	new-contributor t-measure-probability	453/2	Mathlib.lean,Mathlib/Data/Set/Accumulate.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/Topology/Compactness/CompactSystem.lean	5	74	['github-actions', 'leanprover-community-bot-assistant', 'pfaffelh', 'sgouezel']	nobody	1-7437 1 day ago	1-7437 1 day ago	20-41251 20 days
25601	YaelDillies author:YaelDillies	chore(CategoryTheory): unsimp `Mon_Class.tensorObj.one_def`	This lemma loops with `IsMon_Hom.one_hom` applied to `(λ_ N.X).inv`, as evidenced by the following trace: ``` [Meta.Tactic.simp.rewrite] Mon_Class.tensorObj.one_def:1000: Mon_Class.one ==> (λ_ (𝟙_ C)).inv ≫ (Mon_Class.one ⊗ Mon_Class.one) [Meta.Tactic.simp.rewrite] id_tensorHom:1000: 𝟙 (𝟙_ C) ⊗ Mon_Class.one ==> 𝟙_ C ◁ Mon_Class.one [Meta.Tactic.simp.rewrite] id_whiskerLeft:1000: 𝟙_ C ◁ Mon_Class.one ==> (λ_ (𝟙_ C)).hom ≫ Mon_Class.one ≫ (λ_ N.X).inv [Meta.Tactic.simp.rewrite] IsMon_Hom.one_hom:1000: Mon_Class.one ≫ (λ_ N.X).inv ==> Mon_Class.one ``` Alternatively, `one_hom` is fine since it is the equivalent of `map_one` while `one_def` is not fine since it is the equivalent of `Algebra.TensorProduct.one_def`. Do the same thing for the `mul` lemmas and the `Mon_` versions. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-category-theory easy	21/15	Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/CategoryTheory/Monoidal/Bimon_.lean,Mathlib/CategoryTheory/Monoidal/Hopf_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean	4	1	['github-actions']	nobody	1-7179 1 day ago	1-9269 1 day ago	1-9283 1 day
25333	fbarroero author:fbarroero	Primitivity and `Ideal.span (p.coeffs.toSet)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	164/0	Mathlib.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/ContentIdeal.lean	3	1	['github-actions']	nobody	1-5630 1 day ago	9-15460 9 days ago	0-1263 21 minutes
25603	callesonne author:callesonne	feat(Bicategory/InducedBicategory): add induced bicategories	This PR adds a way of inducing a full bicategory structure on given type of objects with a map to the objects of some bicategory (i.e. with all 1-morphisms and all 2-morphisms). I have not tried to implement "locally induced bicategories" which should allow for a sub-class of 1-morphisms as well. This is because copying the naive approach and replacing the map `F` as for induced categories with a functor, one runs into issues when the equalities in `F.map_comp` and `F.map_id` are not defeq equalities. One could probably define locally full sub-bicategories using a pair of `ObjectProperty` + `MorphismProperty` to ensure that the inclusions are actually defeq, but I did not want to get into this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	68/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/InducedBicategory.lean	2	1	['github-actions']	nobody	1-2825 1 day ago	1-2893 1 day ago	1-2884 1 day
25604	sgouezel author:sgouezel	feat: make sure that the simp normal form of equiv-like classes pushes `symm` and `trans` to the right	This follows the usual convention for coercions. See discussion at [#mathlib4 > simp normal form for symm and coercions @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/simp.20normal.20form.20for.20symm.20and.20coercions/near/522879475) For each equiv class, after the PR we should have lemmas like ```lean @[simp] lemma coe_toEquiv (e : G ≃+c[a, b] H) : ⇑e.toEquiv = e := rfl @[simp] lemma coe_symm_toEquiv (e : G ≃+c[a, b] H) : ⇑e.toEquiv.symm = e.symm := rfl @[simp] lemma toEquiv_symm (e : G ≃+c[a, b] H) : e.symm.toEquiv = e.toEquiv.symm := rfl @[simp] lemma toEquiv_trans (e₁ : G ≃+c[a, b] H) (e₂ : H ≃+c[b, c] K) : (e₁.trans e₂).toEquiv = e₁.toEquiv.trans e₂.toEquiv := rfl ``` The PR does not complete this task, because it would require killing the coercion from EquivLike classes to Equivs (which I am planning to do in a subsequent PR), but it is a significant first step in this direction. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		196/64	Mathlib/Algebra/AddConstMap/Equiv.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/TwoDim.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Affine/MazurUlam.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Extension.lean,Mathlib/GroupTheory/Perm/Option.lean,Mathlib/LinearAlgebra/AffineSpace/AffineEquiv.lean,Mathlib/LinearAlgebra/AffineSpace/ContinuousAffineEquiv.lean,Mathlib/LinearAlgebra/RootSystem/IsValuedIn.lean,Mathlib/Logic/Equiv/Option.lean,Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Complex.lean,Mathlib/ModelTheory/Algebra/Field/IsAlgClosed.lean,Mathlib/NumberTheory/NumberField/Discriminant/Defs.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/WithTopBot.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Coalgebra/Equiv.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/PowerBasis.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/LinearPMap.lean,Mathlib/Topology/MetricSpace/DilationEquiv.lean,Mathlib/Topology/VectorBundle/Basic.lean	31	1	['github-actions']	nobody	0-83506 23 hours ago	0-83506 23 hours ago	0-84326 23 hours
25602	DavidLedvinka author:DavidLedvinka	feat(Probability): Law of the product of random variables	Adds `IndepFun.map_mul_eq_map_mconv_map₀` and `IndepFun.map_mul_eq_map_mconv_map` which show that the law of the product of independent random variables is the convolution of their laws. Uses this to show that the sum of independent real gaussian variables is a real gaussian random variable. Also fix a notation change that I missed in #25434.	t-measure-probability	33/2	Mathlib/MeasureTheory/Group/Convolution.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Probability/Independence/Basic.lean	3	3	['DavidLedvinka', 'Komyyy', 'github-actions']	nobody	0-83198 23 hours ago	1-8869 1 day ago	1-8854 1 day
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 blocked-by-other-PR	453/104	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,lakefile.lean	11	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-82630 22 hours ago	1-2475 1 day ago	0-1301 21 minutes
25585	Paul-Lez author:Paul-Lez	feat(Tactic/Linters/DeprecatedSimpLemma): lint for deprecated simp lemmas	The deprecated simp lemma linter flags declarations that have both the `deprecated` and `simp` attributes. See Zulip discussion: [#mathlib4 > Help with Mathlib.Order.Interval.Finset.Defs @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Help.20with.20Mathlib.2EOrder.2EInterval.2EFinset.2EDefs/near/505994843) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter awaiting-author	105/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/DeprecatedSimpLemma.lean,MathlibTest/DeprecatedSimpLemmaTest.lean	4	7	['adomani', 'github-actions', 'grunweg']	nobody	0-81963 22 hours ago	0-81963 22 hours ago	0-34675 9 hours
25605	mans0954 author:mans0954	feature(RingTheory/Polynomial/SmallDegreeVieta): Polynomial versions of results in Algebra.QuadraticDiscriminant	Provide `R[X]` versions of results about quadratic polynomials and their discriminants --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	57/0	Mathlib/RingTheory/Polynomial/SmallDegreeVieta.lean	1	2	['github-actions', 'mans0954']	nobody	0-81404 22 hours ago	0-81404 22 hours ago	0-81395 22 hours
25582	grunweg author:grunweg	fix/feat(PR_summary): improve messages about renamed and removed files	We want to encourange adding module deprecations in a follow-up PR. Hence, - do not warn if such declarations are missing (but add an informational message, asking for a follow-up PR) - do warn if a deprecated_module attribute is present, and suggest a follow-up pull request instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		21/6	.github/workflows/PR_summary.yml	1	6	['adomani', 'eric-wieser', 'github-actions', 'grunweg']	nobody	0-80175 22 hours ago	0-80376 22 hours ago	0-80419 22 hours
24542	pfaffelh author:pfaffelh	feat (Topology/Compactness/CompactSystem): Closed and compact square cylinders form a compact system.	feat (Topology/Compactness/CompactSystem): Closed and compact square cylinders form a compact system. A square cylinder is a set of the form `s.pi t` in a product space. A closed compact square cylinder has `IsClosed (t i)` and `IsCompact (t i)` for all `i ∈ s`. This set system is a compact system (as introduced in PR #24541). Streamline the definition of square cylinders in MeasureTheory/Constructions/Cylinders on the way. Co-authors: Rémy Degenne remy.degenne@inria.fr --- - [x] depends on: #24541 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology blocked-by-other-PR	264/66	Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/Constructions/Cylinders.lean,Mathlib/MeasureTheory/Constructions/ProjectiveFamilyContent.lean,Mathlib/Topology/Compactness/CompactSystem.lean	4	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-80012 22 hours ago	0-84878 23 hours ago	0-192 3 minutes
25600	Komyyy author:Komyyy	refactor: lemma expressing `ContinuousAt` using a punctured neighbourhood	--- This lemma is used to prove that the Riemann zeta function is meromorphic in #25597. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-topology	4/0	Mathlib/Topology/ContinuousOn.lean	1	5	['Komyyy', 'github-actions', 'grunweg']	nobody	0-79228 22 hours ago	0-79228 22 hours ago	1-4716 1 day
25190	wwylele author:wwylele	feat(GroupTheory/Divisible): Add rational SMul and Module	This is part of #25140. A torsion-free ℕ-divisible commutative group is a ℚ-module. This new instance could collide with existing instances such as ℚ-module on ℝ that comes from `Algebra`. I don't know how much an issue this is. I set the new instance with low priority so hopefully it won't interfere existing instances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	127/0	Mathlib/Data/Rat/Lemmas.lean,Mathlib/GroupTheory/Divisible.lean	2	2	['eric-wieser', 'github-actions']	nobody	0-76373 21 hours ago	0-76373 21 hours ago	14-31640 14 days
25608	TOMILO87 author:TOMILO87	Add Beta distribution	feat(Probability/Distributions): add Beta distribution Add the Beta distribution to the probability distributions in mathlib4. This implementation includes: - Definition of the Beta function over the reals - The probability density function (PDF) of the Beta distribution - Proof that the PDF integrates to 1 - Various lemmas about measurability and positivity properties The Beta distribution is a family of continuous probability distributions defined on the interval [0, 1] parametrized by two positive shape parameters, α and β, that control the shape of the distribution. The implementation follows a similar structure to other distributions in mathlib4, particularly the Gamma distribution, adapting the approach to the specific properties of the Beta distribution. --- [![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/Probability/Distributions/Beta.lean	2	1	['github-actions']	nobody	0-76007 21 hours ago	0-76019 21 hours ago	0-76075 21 hours
25573	JovanGerb author:JovanGerb	feat: define `∃ x > y, ...` notation to mean `∃ x, y < x ∧ ...`	This PR changes the elaboration of the binders `∃ x > y,` and `∀ x > y,` to use `<` instead of `>`, because we want to avoid working with `>` as much as possible (and similarly for `≥` vs `≤` ). The advantage is that we don't need to worry about rewriting with lemmas like `gt_iff_lt`. The disadvantage is that people might find this confusing. [#mathlib4 > naming convention for ≤ and < @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/naming.20convention.20for.20.E2.89.A4.20and.20.3C/near/522910464) The main changes are in `Mathlib.Init`, `Mathlib.Util.Delaborators` and `MathlibTest.delaborators`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	59/52	Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/BoxIntegral/Integrability.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Liouville.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Dynamics/Ergodic/Conservative.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Init.lean,Mathlib/MeasureTheory/Covering/LiminfLimsup.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Egorov.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Integral/DivergenceTheorem.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/NumberTheory/LSeries/SumCoeff.lean,Mathlib/Order/Filter/AtTopBot/Finite.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/Topology/CWComplex/Classical/Finite.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/EMetricSpace/Paracompact.lean,Mathlib/Topology/LocallyFinite.lean,Mathlib/Topology/MetricSpace/Ultra/Basic.lean,Mathlib/Util/Delaborators.lean,MathlibTest/delaborators.lean	32	1	['github-actions']	nobody	0-74524 20 hours ago	0-74636 20 hours ago	0-74625 20 hours
25348	wwylele author:wwylele	feat(LinearAlgebra): add independent iSup to LinearPMap	This is part of #25140. To obtain the Hahn embedding, we need to construct an partial linear map spanned by a family of submodules as the base case. This PR prepares for it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	94/2	Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/LinearPMap.lean	2	2	['eric-wieser', 'github-actions']	nobody	0-72911 20 hours ago	8-9468 8 days ago	8-9532 8 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	238/238	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	0-66274 18 hours ago	0-66296 18 hours ago	6-59911 6 days
24850	pechersky author:pechersky	feat(Topology/UniformSpace/Ultra): uniform spaces induced by pseudometrics are ultra if system is ultra	Any uniform space has a natural system of pseudometrics definable on it, comprised of those pseudometrics constructed from a descending chain of equivalence relation entourages. In a nonarchimedean uniformity, this pseudometric system induces the uniformity. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #23111	t-topology awaiting-author	477/1	Mathlib.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/UniformSpace/Ultra/Pseudometrizable.lean	3	7	['ADedecker', 'fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'pechersky']	nobody	0-63809 17 hours ago	11-67758 11 days ago	15-31955 15 days
25009	mans0954 author:mans0954	feat(Analysis/SpecialFunctions/Trigonometric/Basic): sin and cos of multiples of π / 3	Add results: - `cos_ofNat_mul_pi_div_ofNat_of_eq_sub_one` : `cos ((n - 1) * π / n) = - cos π / n` - `cos_ofNat_mul_pi_div_ofNat_of_eq_two_mul_sub_one` : `cos ((2 * n - 1) * π / n) = cos π / n` - `cos_ofNat_mul_pi_div_ofNat_of_eq_add_one` : `cos ((n + 1) * π / n) = - cos π / n` And similar for `sin` and `tan`. This allows `norm_num` to prove results like: ``` example : cos (2 * π / 3) = - 1 / 2 := by norm_num example : cos (4 * π / 3) = - 1 / 2 := by norm_num example : cos (5 * π / 3) = 1 / 2 := by norm_num ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	160/0	Mathlib/Algebra/Order/Monoid/NatCast.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Data/Nat/Cast/Defs.lean,MathlibTest/trigonometry.lean	4	10	['eric-wieser', 'github-actions', 'mans0954']	nobody	0-56185 15 hours ago	18-43609 18 days ago	20-38549 20 days
25515	jcommelin author:jcommelin	chore: remove unneeded [nolint simpNF]s	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		48/77	Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/CategoryTheory/EqToHom.lean,Mathlib/CategoryTheory/Limits/Shapes/Biproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/WithTerminal/Basic.lean,Mathlib/Data/Int/Cast/Basic.lean,Mathlib/Geometry/RingedSpace/Stalks.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Basic.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/TensorAlgebra/ToTensorPower.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/SimpleFuncDense.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/Topology/Sheaves/Stalks.lean,Mathlib/Topology/Specialization.lean	16	3	['JovanGerb', 'github-actions']	nobody	0-55941 15 hours ago	0-56110 15 hours ago	2-7970 2 days
25304	igorkhavkine author:igorkhavkine	feat(Analysis/Calculus/FDeriv): continuous differentiability from continuous partial derivatives on an open domain in a product space	If a function `f : E × F → G` is continuously differentiable, then its partial derivatives along `E` and `F` are also continuous. The non-trivial converse implication holds when the partial derivatives are continuous on an open domain, and they can be added together to give the total derivative of `f`. See this [#mathlib4 > Partial derivatives @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Partial.20derivatives/near/520995477) and the containing thread for some discussion. The PR creates a new import (`Mathlib.Analysis.Calculus.FDeriv.Partial`), where other results about partial derivatives could go in the future. - [ ] depends on: #25564 - [ ] depends on: #25562 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis blocked-by-other-PR	333/0	Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Topology/Algebra/Module/Equiv.lean	4	19	['YaelDillies', 'github-actions', 'grunweg', 'igorkhavkine', 'mathlib4-dependent-issues-bot']	nobody	0-54140 15 hours ago	2-18241 2 days ago	4-14790 4 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	71/77	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/GroupTheory/Perm/Sign.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Ring.lean	19	11	['Parcly-Taxel', 'apnelson1', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'urkud']	nobody	0-51824 14 hours ago	2-794 2 days ago	63-65172 63 days
25564	igorkhavkine author:igorkhavkine	feat(Topology/Algebra/Module): interaction between ContinuousLinearMap.coprod and ContinuousLinearEquiv.prodComm	`ContinuousLinearMap.coprod_comp_prodComm` shows that pre-composition of a coproduct with prodComm (swap) swaps the terms in the coproduct. A dependency of #25304. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	7/0	Mathlib/Topology/Algebra/Module/Equiv.lean	1	12	['YaelDillies', 'github-actions', 'grunweg', 'igorkhavkine']	nobody	0-51114 14 hours ago	0-51114 14 hours ago	0-69628 19 hours
25616	erdOne author:erdOne	feat(RingTheory/Invariant): residue field extension is finite	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	51/0	Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/RingTheory/Invariant/Basic.lean	2	1	['github-actions']	nobody	0-47164 13 hours ago	0-47174 13 hours ago	0-47226 13 hours
24692	ScottCarnahan author:ScottCarnahan	feat (RingTheory/HahnSeries/Basic): isomorphism of Hahn series induced by order isomorphism	This PR introduces an isomorphism of Hahn series induced by an order isomorphism on the exponent posets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order WIP	35/0	Mathlib/RingTheory/HahnSeries/Basic.lean	1	1	['github-actions']	nobody	0-46897 13 hours ago	0-46897 13 hours ago	31-47622 31 days
25035	ScottCarnahan author:ScottCarnahan	feat (Algebra/Module/Equiv/Defs): Linear equivalence between linear hom and semilinear hom.	Given a ring homomorphism `σ₂ : R →+* R₂`, an `R`-module `M`, and a module `M₂` for both `R` and `R₂` satisfying `SMulCommClass R R₂ M₂` and `(σ₂ r) • x = r • x`, we produce an `R₂`-linear equivalence between `M →ₗ[R] M₂` and `M →ₛₗ[σ₂] M₂`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	21/0	Mathlib/Algebra/Module/Equiv/Defs.lean	1	1	['github-actions']	nobody	0-46884 13 hours ago	0-46884 13 hours ago	20-7584 20 days
25034	ScottCarnahan author:ScottCarnahan	feat (Algebra/Module/Equiv/Basic): Restriction of scalars from a semilinear equivalence to a linear equivalence.	If `M` and `M₂` are both `R`-modules and modules for `S` and `S₂`, respectively, then for any ring isomorphism `e` between `S` and `S₂` and any `e`-semilinear equivalence between `M` and `M₂` that respects the `R`-action, we obtain an `R`-linear equivalence between `M` and `M₂`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	28/0	Mathlib/Algebra/Module/Equiv/Basic.lean	1	1	['github-actions']	nobody	0-46859 13 hours ago	0-46859 13 hours ago	20-11468 20 days
25470	mans0954 author:mans0954	Low order roots of unity	Compute some low order roots of unity. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/roots.20of.20unity.20-.20computing.20low.20degree/with/520523576) Cubic case contributed by @MichaelStollBayreuth See also: #25215, #24828 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	182/0	Mathlib/Algebra/CharP/Invertible.lean,Mathlib/RingTheory/RootsOfUnity/Complex.lean	2	1	['github-actions']	nobody	0-46136 12 hours ago	0-46136 12 hours ago	2-75320 2 days
24498	ScottCarnahan author:ScottCarnahan	refactor (RingTheory/HahnSeries/HEval): remove positive order condition from definition	This PR removes the positive order condition for substitution (or Hahn evaluation) of a Hahn series into a power series. When the order is not positive, the function substitutes zero. We also add short lemmas for substitution into `PowerSeries.X` and `PowerSeries.C`. --- Is there a better way to express `eq_toFun`? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	33/13	Mathlib/RingTheory/HahnSeries/HEval.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	0-45683 12 hours ago	0-45719 12 hours ago	37-42657 37 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/)	t-data	65/0	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Set/Card/Arithmetic.lean,Mathlib/Data/Set/Finite/Lattice.lean	3	11	['YaelDillies', 'chrisflav', 'github-actions']	YaelDillies assignee:YaelDillies	0-42428 11 hours ago	31-25784 1 month ago	61-54575 61 days
24530	chrisflav author:chrisflav	feat(RingTheory): faithfully flat ring maps	Co-authored by: Joël Riou --- - [x] depends on: #24375 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	92/1	Mathlib.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/RingTheory/RingHom/FaithfullyFlat.lean,Mathlib/RingTheory/RingHom/Flat.lean	4	4	['chrisflav', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-42212 11 hours ago	30-36220 30 days ago	30-37286 30 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. --- - [x] depends on: #24498 [![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$	180/23	Mathlib.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Binomial.lean,Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/PowerSeries/Binomial.lean	6	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-41062 11 hours ago	0-41079 11 hours ago	15-33856 15 days
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 $(A, B) \mapsto (A \otimes_k B)_G.$ --- - [x] depends on: #21652 - [x] depends on: #21732 - [x] depends on: #21733 - [x] depends on: #21735 - [x] depends on: #21736 - [x] depends on: #21738 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-algebra label:t-algebra$	236/17	Mathlib.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/Resolution.lean	7	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-41000 11 hours ago	unknown	unknown
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	276/21	Mathlib.lean,Mathlib/CategoryTheory/FiberedCategory/Cartesian.lean,Mathlib/CategoryTheory/FiberedCategory/HasFibers.lean,Mathlib/CategoryTheory/FiberedCategory/HomLift.lean	4	26	['callesonne', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	0-40081 11 hours ago	233-21757 7 months ago *	0-571 9 minutes *
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	273/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Types/ColimitType.lean	2	10	['AntoineChambert-Loir', 'adamtopaz', 'erdOne', 'github-actions', 'joelriou']	adamtopaz assignee:adamtopaz	0-39795 11 hours ago	0-39795 11 hours ago	53-13313 53 days
24794	chrisflav author:chrisflav	feat(RingTheory/Presentation): core of a presentation	If `P` is a presentation of `S` as an `R`-algebra and `R₀` a subring of `R` containing the coefficients of the relations of `P`, then there exists an `R₀`-algebra `S₀` such that `S` is isomorphic to the base change of `S₀` to `R`. This is a tool to remove Noetherian hypothesis in certain situations. --- - [x] depends on: #24788 - [x] depends on: #24786 - [x] depends on: #24785 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	252/2	Mathlib.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/RingTheory/AlgebraicIndependent/Transcendental.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean	8	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-39504 10 hours ago	0-42200 11 hours ago	0-43141 11 hours
24520	chrisflav author:chrisflav	feat(Algebra/Pi): add various `AlgEquiv`s and `RingEquiv`s	Add - `RingEquiv.sumArrowEquivProdArrow`: ring version of `Equiv.sumArrowEquivProdArrow`. - `AlgEquiv.sumArrowEquivProdArrow`: algebra version of `Equiv.sumArrowEquivProdArrow`. - `AlgEquiv.piCongrLeft'`: algebra version of `Equiv.piCongrLeft`. - `AlgEquiv.piCongrLeft`: algebra version of `Equiv.piCongrLeft`. - `AlgEquiv.funUnique`: algebra version of `Equiv.funUnique`. - `AlgEquiv.prodCongr`: algebra version of `Equiv.prodCongr`. The four last ones already have ring versions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	116/1	Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Ring/Equiv.lean	3	20	['Ruben-VandeVelde', 'chrisflav', 'eric-wieser', 'github-actions', 'mistarro']	eric-wieser assignee:eric-wieser	0-38754 10 hours ago	15-76048 15 days ago	39-8351 39 days
24379	chrisflav author:chrisflav	feat(Algebra/AlgHom): `Unique` if target is `Subsingleton`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	32/0	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean	2	6	['chrisflav', 'eric-wieser', 'github-actions']	nobody	0-38535 10 hours ago	39-28735 1 month ago	39-64672 39 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	264/14	Mathlib/Data/Set/Pairwise/Lattice.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/MeasurableSpace/Pi.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/MeasureTheory/SetSemiring.lean,lakefile.lean	6	15	['EtienneC30', 'Paul-Lez', 'github-actions', 'leanprover-community-bot-assistant', 'pfaffelh', 'sgouezel']	EtienneC30 assignee:EtienneC30	0-38025 10 hours ago	0-38025 10 hours ago	23-54117 23 days
25442	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure) : add a definition of total variation for VectorMeasure	This PR adds variation for any `VectorMeasure` using a supremum definition. Currently mathlib has `TotalVariation` defined for a signed measure using the Hahn-Jordan decomposition, but this doesn't generalise. Includes the result showing that for `SignedMeasure`s the two definitions coincide. Motivation: generally this is an important concept but specifically as a step for proving RMK in the complex case which in turn is a step to prove the spectral theorem. Co-authored-by: @yoh-tanimoto --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor RFC	664/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation.lean	2	4	['github-actions', 'grunweg', 'oliver-butterley']	nobody	0-37769 10 hours ago	0-38103 10 hours ago	0-38511 10 hours
25050	linesthatinterlace author:linesthatinterlace	feat: Add `Vector`/`List.Vector` equivalence	Adds an equivalence between `Vector` and `List.Vector`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	125/17	Mathlib/Data/Vector/Basic.lean,Mathlib/Data/Vector/Defs.lean,Mathlib/Logic/Equiv/Array.lean	3	57	['digama0', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	0-37494 10 hours ago	0-40379 11 hours ago	6-55239 6 days
24430	RemyDegenne author:RemyDegenne	feat(Probability): Fernique's theorem	- invariance by rotation of Gaussian measures - Fernique's theorem - Corollary: the identity is in Lp for all finite p --- - [x] depends on: #24975 - [x] depends on: #24969 - [x] depends on: #24930 - [x] depends on: #24925 - [x] depends on: #24900 - [ ] depends on: #25532 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability WIP	967/9	Mathlib.lean,Mathlib/MeasureTheory/Group/Convolution.lean,Mathlib/MeasureTheory/Measure/CharacteristicFunction.lean,Mathlib/Probability/Distributions/Fernique.lean,Mathlib/Probability/Distributions/Gaussian/Basic.lean,Mathlib/Probability/Distributions/Gaussian/Fernique.lean	6	9	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-37068 10 hours ago	0-37071 10 hours ago	0-0 0 seconds
25599	adomani author:adomani	test: autolabel from forks	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	test-ci awaiting-author WIP	1/1	Mathlib/Tactic/Eval.lean,newFileOnMaster.md	2	3	['adomani', 'bryangingechen', 'github-actions']	nobody	0-33809 9 hours ago	1-9271 1 day ago	0-0 0 seconds
24506	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): Initial lemmas for the `rotate_iso` tactic	This PR records an initial set of lemmas to be used by the WIP `rotate_isos` tactic. --- - [ ] depends on: #24452 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta blocked-by-other-PR	496/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,scripts/noshake.json	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-32763 9 hours ago	39-28930 1 month ago	0-47 47 seconds
25617	Parcly-Taxel author:Parcly-Taxel	chore: fix more induction/recursor branch names	These were found using the regex `\\| h. =>` and `def.rec.\(h. :`.	tech debt	88/79	Mathlib/Analysis/Convolution.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/NatAntidiagonal.lean,Mathlib/Data/Nat/Factorization/Induction.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Set/Card.lean,Mathlib/Data/WSeq/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/Logic/Function/Iterate.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/SumFourSquares.lean,Mathlib/NumberTheory/SumTwoSquares.lean,Mathlib/Order/Synonym.lean	14	1	['github-actions']	nobody	0-32126 8 hours ago	0-42925 11 hours ago	0-42910 11 hours
22790	mhk119 author:mhk119	feat: Extend `taylor_mean_remainder_lagrange` to `x < x_0`	The `taylor_mean_remainder_lagrange` theorem has the assumption that $x_0 < x$. In many applications, we need $x < x_0$ and one cannot use the current version to obtain this (see [zulip](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Taylor's.20theorem)). This PR introduces a set of theorems that push negations through Taylor expansions so that one can extend `taylor_mean_remainder_lagrange` to the case when $x < x_0$. These theorems should also be useful elsewhere since they are quite general.	new-contributor t-analysis awaiting-author	393527/62	Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/Taylor.lean,README.md,build/ir/Mathlib/Algebra/Abs.c,build/ir/Mathlib/Control/Basic.c,build/ir/Mathlib/Control/Functor.c,build/ir/Mathlib/Control/SimpSet.c,build/ir/Mathlib/Data/Array/Defs.c,build/ir/Mathlib/Data/Bracket.c,build/ir/Mathlib/Data/HashMap.c,build/ir/Mathlib/Data/KVMap.c,build/ir/Mathlib/Data/Rat/Init.c,build/ir/Mathlib/Data/String/Defs.c,build/ir/Mathlib/Init/Algebra/Classes.c,build/ir/Mathlib/Init/CcLemmas.c,build/ir/Mathlib/Init/Control/Combinators.c,build/ir/Mathlib/Init/Core.c,build/ir/Mathlib/Init/Data/Bool/Basic.c,build/ir/Mathlib/Init/Data/Fin/Basic.c,build/ir/Mathlib/Init/Data/Int/Basic.c,build/ir/Mathlib/Init/Data/List/Basic.c,build/ir/Mathlib/Init/Data/Nat/Basic.c,build/ir/Mathlib/Init/Data/Nat/Notation.c,build/ir/Mathlib/Init/Data/Ordering/Basic.c,build/ir/Mathlib/Init/Data/Prod.c,build/ir/Mathlib/Init/Data/Quot.c,build/ir/Mathlib/Init/Data/Sigma/Basic.c,build/ir/Mathlib/Init/Function.c,build/ir/Mathlib/Init/Logic.c,build/ir/Mathlib/Init/Propext.c,build/ir/Mathlib/Init/Quot.c,build/ir/Mathlib/Init/Set.c,build/ir/Mathlib/Init/ZeroOne.c,build/ir/Mathlib/Lean/CoreM.c,build/ir/Mathlib/Lean/Elab/Tactic/Basic.c,build/ir/Mathlib/Lean/EnvExtension.c,build/ir/Mathlib/Lean/Exception.c,build/ir/Mathlib/Lean/Expr.c,build/ir/Mathlib/Lean/Expr/Basic.c,build/ir/Mathlib/Lean/Expr/ReplaceRec.c,build/ir/Mathlib/Lean/Expr/Traverse.c,build/ir/Mathlib/Lean/Linter.c,build/ir/Mathlib/Lean/LocalContext.c,build/ir/Mathlib/Lean/Message.c,build/ir/Mathlib/Lean/Meta.c,build/ir/Mathlib/Lean/Meta/Basic.c,build/ir/Mathlib/Lean/Meta/DiscrTree.c,build/ir/Mathlib/Lean/Meta/Simp.c,build/ir/Mathlib/Mathport/Attributes.c,build/ir/Mathlib/Mathport/Notation.c,build/ir/Mathlib/Mathport/Rename.c,build/ir/Mathlib/Tactic/Alias.c,build/ir/Mathlib/Tactic/ApplyCongr.c,build/ir/Mathlib/Tactic/ApplyWith.c,build/ir/Mathlib/Tactic/Basic.c,build/ir/Mathlib/Tactic/Cases.c,build/ir/Mathlib/Tactic/CasesM.c,build/ir/Mathlib/Tactic/Classical.c,build/ir/Mathlib/Tactic/Clear!.c,build/ir/Mathlib/Tactic/ClearExcept.c,build/ir/Mathlib/Tactic/Clear_.c,build/ir/Mathlib/Tactic/Coe.c,build/ir/Mathlib/Tactic/Congr!.c,build/ir/Mathlib/Tactic/Constructor.c,build/ir/Mathlib/Tactic/Conv.c,build/ir/Mathlib/Tactic/Convert.c,build/ir/Mathlib/Tactic/Core.c,build/ir/Mathlib/Tactic/Eqns.c,build/ir/Mathlib/Tactic/Existsi.c,build/ir/Mathlib/Tactic/FailIfNoProgress.c,build/ir/Mathlib/Tactic/GeneralizeProofs.c,build/ir/Mathlib/Tactic/GuardGoalNums.c,build/ir/Mathlib/Tactic/GuardHypNums.c,build/ir/Mathlib/Tactic/Have.c,build/ir/Mathlib/Tactic/HelpCmd.c,build/ir/Mathlib/Tactic/HigherOrder.c,build/ir/Mathlib/Tactic/InferParam.c,build/ir/Mathlib/Tactic/Inhabit.c,build/ir/Mathlib/Tactic/LabelAttr.c,build/ir/Mathlib/Tactic/LeftRight.c,build/ir/Mathlib/Tactic/MkIffOfInductiveProp.c,build/ir/Mathlib/Tactic/Monotonicity/Attr.c,build/ir/Mathlib/Tactic/NthRewrite.c,build/ir/Mathlib/Tactic/PermuteGoals.c,build/ir/Mathlib/Tactic/PrintPrefix.c,build/ir/Mathlib/Tactic/ProjectionNotation.c,build/ir/Mathlib/Tactic/RSuffices.c,build/ir/Mathlib/Tactic/Relation/Rfl.c,build/ir/Mathlib/Tactic/Relation/Symm.c,build/ir/Mathlib/Tactic/Relation/Trans.c,build/ir/Mathlib/Tactic/Rename.c,build/ir/Mathlib/Tactic/RenameBVar.c,build/ir/Mathlib/Tactic/Replace.c,build/ir/Mathlib/Tactic/RunCmd.c,build/ir/Mathlib/Tactic/ScopedNS.c	492	11	['Paul-Lez', 'github-actions', 'grunweg']	nobody	0-30324 8 hours ago	60-27268 1 month ago	30-77130 30 days
25308	pechersky author:pechersky	chore(Algebra/Ring/Subring): simp tag `Subring.smul_def`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) I found this being not-simp frustrating when talking about submodules over a valuation subring.	t-algebra awaiting-author label:t-algebra$	7/3	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/RingTheory/OreLocalization/Basic.lean	7	2	['eric-wieser', 'github-actions']	nobody	0-28572 7 hours ago	10-24448 10 days ago	0-24882 6 hours
24628	pechersky author:pechersky	feat(Topology/UniformSpace/Ultra): completion is ultra uniformity iff base is	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	162/7	Mathlib.lean,Mathlib/Order/Filter/Map.lean,Mathlib/Order/Filter/NAry.lean,Mathlib/Order/Filter/Prod.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/Ultra/Basic.lean,Mathlib/Topology/UniformSpace/Ultra/Completion.lean	8	11	['ADedecker', 'D-Thomine', 'github-actions']	nobody	0-28560 7 hours ago	0-28560 7 hours ago	3-50967 3 days
25621	joelriou author:joelriou	refactor(CategoryTheory/Limits): generalize universes for colimits of representables	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory WIP	756/21	Mathlib.lean,Mathlib/AlgebraicTopology/SingularSet.lean,Mathlib/CategoryTheory/Elements.lean,Mathlib/CategoryTheory/Limits/PresheafULift.lean,Mathlib/CategoryTheory/Types.lean,Mathlib/CategoryTheory/Yoneda.lean	6	1	['github-actions']	nobody	0-27344 7 hours ago	0-27425 7 hours ago	0-1 1 second
25458	ADedecker author:ADedecker	feat: integrability assuming that the domain/codomain is a subsingleton	I really only care about the codomain being trivial for #25455 , but thought I'd add some more lemmas on the way. The `@[simp]` attributes are here to make sure that these lemmas are accessible to the `nontriviality` tactic. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	35/0	Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean	3	6	['ADedecker', 'Ruben-VandeVelde', 'github-actions', 'leanprover-bot', 'sgouezel']	nobody	0-27059 7 hours ago	0-27059 7 hours ago	4-54473 4 days
24452	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): `Cancelable` boilerplate for the `rotate_isos` WIP tactic	This PR adds some boilerplate that will be used in a forthcoming PR implementing a `rotate_isos` tactic that aims to provide easy ways of moving one or more morphisms that can be inferred to be isomorphisms (not necessarily through the `IsIso typeclass, but also directly by recognizing them as e.g components of natural isomorphisms, or functor application to such morphisms). The boilerplate in this PR abstracts the notion of a cancelable expression for a morphism in a composition of (iso)morphisms in a category, and records a global reference to a list of "cancelable factories", _i.e_ functions that try to recognize term in an expression as a "cancelable" morphism, and provides helper to register such functions. --- First part of a series of 3 PRs contributing the `rotate_isos` tactic to mathlib. Second part will actually implement the tactic, and provide a test suite. Please read the description of the second PR (#24454) to get more details. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory t-meta awaiting-author	162/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,scripts/noshake.json	4	8	['callesonne', 'github-actions', 'robin-carlier']	nobody	0-26112 7 hours ago	0-84530 23 hours ago	38-38748 38 days
25230	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): definition of cohen macaulay	In this PR, we added the definition of CM module, CM local ring (extending local ring), and CM ring. We also proved Theorem 30, Chater 6, _Commutative Algebra_, Matsumura. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	2211/37	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/Spectrum/Prime/LTSeries.lean,Mathlib/RingTheory/Support.lean	16	n/a	['github-actions', 'leanprover-community-bot-assistant']	nobody	0-25003 6 hours ago	unknown	unknown
25334	matthewjasper author:matthewjasper	feat(RingTheory/Flat): Add theorems relating Submodule.torsion and Module.Flat	Co-authored-by: Kevin Buzzard --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT new-contributor t-algebra label:t-algebra$	202/0	Mathlib.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/RingTheory/Flat/TorsionFree.lean,Mathlib/RingTheory/Ideal/IsPrincipal.lean	5	13	['alreadydone', 'erdOne', 'github-actions', 'kbuzzard']	nobody	0-24330 6 hours ago	9-7627 9 days ago	9-7626 9 days
22420	pechersky author:pechersky	feat(Order/Prod/Lex/{Hom,Monoid,GroupWithZero}): ordered inclusions and projections of prod of ordered groups	--- - [x] depends on: #22402 - [x] depends on: #25466 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra label:t-algebra$	363/0	Mathlib.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Order/Prod/Lex/GroupWithZero.lean,Mathlib/Order/Prod/Lex/Hom.lean,Mathlib/Order/Prod/Lex/Monoid.lean	7	17	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'pechersky']	YaelDillies assignee:YaelDillies	0-23974 6 hours ago	0-23981 6 hours ago	58-17922 58 days
25562	igorkhavkine author:igorkhavkine	feat(Analysis/Normed/Operator): continuity of forming `ContinuousLinearMap` coproducts pointwise	`Continuous(\|On).clm_coprod` shows that the pointwise coproduct of two continuous functions valued in ContinuousLinearMap is itself continuous. A dependency of #25304. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	16/0	Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean	1	4	['YaelDillies', 'github-actions', 'igorkhavkine']	nobody	0-22777 6 hours ago	0-55896 15 hours ago	0-74699 20 hours
25623	mattrobball author:mattrobball	feat: decidable equality for `Quiver.Path`	Given a quiver with decidable equality on its vertices and arrows, we construct an instance of decidable equality for `Quiver.Path`. We proceed through a recursion on the length of the path utilizing an intermediate subtype of uniformly bounded paths `Quiver.Path.BoundedPath`. This was motivated by doing computations on small quivers with Lean. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		69/0	Mathlib/Combinatorics/Quiver/Path.lean	1	1	['github-actions']	nobody	0-22514 6 hours ago	0-22603 6 hours ago	0-0 0 seconds
25586	JovanGerb author:JovanGerb	chore(Order): use new ge/gt naming convention - Part 5	This PR renames, moves around, and deprecates theorems about `PartialOrder`s The main changes are in `Mathlib.Order.Defs.PartialOrder` and `Mathlib.Order.Basic`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		132/121	Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/Group/PosPart.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Ring/Unbundled/Basic.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/Darboux.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/Jensen.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/Normed/Group/Quotient.lean,Mathlib/Analysis/Normed/Unbundled/RingSeminorm.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromBounded.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Bilinear.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/IntegralRepresentation.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Inverse.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Additive/CauchyDavenport.lean,Mathlib/Combinatorics/Additive/Energy.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/Find.lean,Mathlib/Data/Set/Sups.lean,Mathlib/FieldTheory/Normal/Closure.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/LinearAlgebra/Dimension/DivisionRing.lean,Mathlib/LinearAlgebra/FreeModule/PID.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/ConvexBody.lean,Mathlib/NumberTheory/SumFourSquares.lean,Mathlib/Order/Basic.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/Cover.lean,Mathlib/Order/Defs/PartialOrder.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/Order/Interval/Set/Basic.lean,Mathlib/Order/UpperLower/Closure.lean,Mathlib/RingTheory/ChainOfDivisors.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Regular/IsSMulRegular.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Family.lean,Mathlib/Topology/Compactness/DeltaGeneratedSpace.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean,Mathlib/Topology/Instances/ENat.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean,Mathlib/Topology/Neighborhoods.lean,Mathlib/Topology/NhdsSet.lean,Mathlib/Topology/Order.lean	69	3	['JovanGerb', 'github-actions']	bryangingechen assignee:bryangingechen	0-22471 6 hours ago	1-29963 1 day ago	1-29947 1 day
25620	paulorauber author:paulorauber	feat(Probability): sum of sub-Gaussian random variables is sub-Gaussian	This shows that the sum of two sub-Gaussian random variables is sub-Gaussian. A previous lemma (`add_of_indepFun`) shows that the sum of two _independent_ sub-Gaussian random variables is sub-Gaussian. --- - The proof of `integrable_exp_mul` is the same as in `add_of_indepFun`, but creating an additional lemma seems excessive. - The positivity requirements (`hcX` and `hcY`) can be eliminated once there is a proof that a 0-subGaussian random variable is zero almost surely. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	31/0	Mathlib/Probability/Moments/SubGaussian.lean	1	5	['github-actions', 'paulorauber', 'sgouezel']	nobody	0-20628 5 hours ago	0-26865 7 hours ago	0-5071 1 hour
25574	D-Thomine author:D-Thomine	feat(Cardinal/Finite): ENat powers and cardinality	We define the powers of an extended natural number by another extended natural numbers in a new file `Data.Enat.Pow`. We extend `Nat.card_fun` to arbitrary types in `SetTheory.Cardinal.Finite`. - We add a few useful instances (`Pi.nonemptyUnique`, `NoZeroDivisors ℕ∞`, `Subsingleton ℕ∞ˣ`). The latter is in an odd place (`Data.Enat.Pow`), but I did not find a file with the right imports, and did not want to blow up imports in, say, `Data.Enat.Basic`. - This PR has significant overlap with PR #16810 by @urkud . Most of it is convergent evolution (even the names), but I lifted and tweaked the `Pow` instance from there. Overall, I wouldn't mind if we first merged Yuri's PR; it would be better for documenting code contribution, but make for a more complicated process. Another solution would be to add Yuri as an author/copyright holder to `Data.Enat.Pow` if he agrees. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-data	176/1	Mathlib.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/ENat/Pow.lean,Mathlib/Logic/Unique.lean,Mathlib/SetTheory/Cardinal/Finite.lean	5	2	['github-actions', 'sgouezel']	nobody	0-19715 5 hours ago	1-77362 1 day ago	1-81284 1 day
25527	xroblot author:xroblot	feat(Data/ZMod): add some simps lemma	Add simps lemma to relate the maps constructed here with `Int.castRingHom (ZMod n)` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-algebra label:t-algebra$	20/0	Mathlib/Data/ZMod/QuotientRing.lean	1	3	['github-actions', 'riccardobrasca', 'xroblot']	nobody	0-19544 5 hours ago	3-40943 3 days ago	3-41033 3 days
24977	YaelDillies author:YaelDillies	feat(WithZero): `exp : ℤ → ℤₘ₀`, `log : ℤₘ₀ → ℤ`	In valuation theory, valuations have codomain `{0} ∪ {e ^ n \| n : ℤ}`, which we can formalise as `ℤₘ₀ := WithZero (Multiplicative ℤ)`. It is important to be able to talk about the maps `n ↦ e ^ n` and `e ^ n ↦ n`. We define these as `exp : ℤ → ℤₘ₀` and `log : ℤₘ₀ → ℤ` with junk value `log 0 = 0`. Junkless versions are defined as `expEquiv : ℤ ≃ ℤₘ₀ˣ` and `logEquiv : ℤₘ₀ˣ ≃ ℤ`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	156/36	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/GroupWithZero/Int.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Ring/IsNonarchimedean.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean	8	15	['YaelDillies', 'eric-wieser', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky', 'smmercuri']	nobody	0-19141 5 hours ago	0-19162 5 hours ago	22-69464 22 days
25619	xroblot author:xroblot	feat(NumberField/CMField): A totally complex abelian extension of ℚ is CM	--- - [ ] depends on: #23858 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	165/6	Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/LinearAlgebra/Dimension/Finrank.lean,Mathlib/NumberTheory/NumberField/CMField.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-19121 5 hours ago	0-35075 9 hours ago	0-118 1 minute
24796	erdOne author:erdOne	feat(AlgebraicGeometry): locally directed gluing	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	480/159	Mathlib.lean,Mathlib/AlgebraicGeometry/Cover/Sigma.lean,Mathlib/AlgebraicGeometry/Gluing.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Subscheme.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/Morphisms/Basic.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/Restrict.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/CategoryTheory/LocallyDirected.lean	10	11	['chrisflav', 'erdOne', 'github-actions']	nobody	0-19044 5 hours ago	0-19044 5 hours ago	10-9339 10 days
25613	erdOne author:erdOne	chore(RingTheory/DedekindDomain): missing instances	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	107/3	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/OrderIso.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/FractionalIdeal/Basic.lean	4	1	['github-actions']	nobody	0-18990 5 hours ago	0-61631 17 hours ago	0-61686 17 hours
24998	YaelDillies author:YaelDillies	chore(Algebra/Notation): separate very basic lemmas about `Set.indicator` and `Pi.single`	The very basic lemmas go under `Algebra.Notation` and do not import `Monoid`. This is useful to disentangle `Finsupp` results downstream. --- - [x] depends on: #25040 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed large-import	726/652	Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/Divisibility/Prod.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Equiv/TypeTags.lean,Mathlib/Algebra/Group/Fin/Tuple.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Indicator.lean,Mathlib/Algebra/Group/Nat/Hom.lean,Mathlib/Algebra/Group/NatPowAssoc.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/Pointwise/Set/Scalar.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Support.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Indicator.lean,Mathlib/Algebra/Homology/Additive.lean,Mathlib/Algebra/Module/Basic.lean,Mathlib/Algebra/Notation/FiniteSupport.lean,Mathlib/Algebra/Notation/Indicator.lean,Mathlib/Algebra/Notation/Pi/Basic.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Notation/Support.lean,Mathlib/Algebra/Order/Field/Pi.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Sub/Prod.lean,Mathlib/Algebra/Order/Sum.lean,Mathlib/Algebra/Ring/CharZero.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/CategoryTheory/Limits/Shapes/ZeroMorphisms.lean,Mathlib/Combinatorics/Additive/Dissociation.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/Int/CharZero.lean,Mathlib/Data/Set/Pointwise/Support.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Pi.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/EventuallyConst.lean,Mathlib/Order/Interval/Set/Pi.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Basic.lean,Mathlib/Topology/Algebra/Indicator.lean,Mathlib/Topology/IndicatorConstPointwise.lean,Mathlib/Topology/LocallyConstant/Basic.lean,Mathlib/Topology/LocallyFinsupp.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/DisjointCover.lean,scripts/noshake.json	58	11	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-18836 5 hours ago	0-18860 5 hours ago	14-16551 14 days
25002	YaelDillies author:YaelDillies	chore(Finsupp): move order properties under `Order`	--- - [ ] depends on: #24998 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed large-import blocked-by-other-PR	1067/968	Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/Divisibility/Prod.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Equiv/TypeTags.lean,Mathlib/Algebra/Group/Fin/Tuple.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Indicator.lean,Mathlib/Algebra/Group/Nat/Hom.lean,Mathlib/Algebra/Group/NatPowAssoc.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/Pointwise/Set/Scalar.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Support.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Indicator.lean,Mathlib/Algebra/Homology/Additive.lean,Mathlib/Algebra/Module/Basic.lean,Mathlib/Algebra/Notation/FiniteSupport.lean,Mathlib/Algebra/Notation/Indicator.lean,Mathlib/Algebra/Notation/Pi/Basic.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Notation/Support.lean,Mathlib/Algebra/Order/Field/Pi.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Sub/Prod.lean,Mathlib/Algebra/Order/Sum.lean,Mathlib/Algebra/Ring/CharZero.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/CategoryTheory/Limits/Shapes/ZeroMorphisms.lean,Mathlib/Combinatorics/Additive/Dissociation.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Ext.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Finsupp/SMulWithZero.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/Int/CharZero.lean,Mathlib/Data/Set/Pointwise/Support.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Pi.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/EventuallyConst.lean,Mathlib/Order/Interval/Set/Pi.lean,Mathlib/Order/Preorder/Finsupp.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Basic.lean,Mathlib/Topology/Algebra/Indicator.lean,Mathlib/Topology/IndicatorConstPointwise.lean,Mathlib/Topology/LocallyConstant/Basic.lean,Mathlib/Topology/LocallyFinsupp.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/DisjointCover.lean,scripts/noshake.json	62	7	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-18812 5 hours ago	0-18831 5 hours ago	0-875 14 minutes
25365	YaelDillies author:YaelDillies	feat: `CommAlgCat` is cocartesian-monoidal	Construct the cocartesian-monoidal category structure on `CommAlgCat R` explicitly from the tensor product. From Toric 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 t-algebra label:t-algebra$	142/5	Mathlib.lean,Mathlib/Algebra/Category/CommAlgCat/Basic.lean,Mathlib/Algebra/Category/CommAlgCat/Monoidal.lean	3	8	['YaelDillies', 'erdOne', 'github-actions']	nobody	0-18718 5 hours ago	7-26981 7 days ago	7-28134 7 days
25584	YaelDillies author:YaelDillies	chore(Algebra/Order/Module/Defs): don't import fields	Instead move the few `Field` lemmas to a new file `Algebra.Order.Module.Field` (https://github.com/leanprover-community/mathlib3/pull/9077 for the copyright) and the `positivity` extension to `Tactic.Positivity.Basic`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		184/153	Archive/Wiedijk100Theorems/InverseTriangleSum.lean,Mathlib.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/SchwartzZippel.lean,Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Algebra/Order/BigOperators/Expect.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Floor/Div.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Order/Module/Algebra.lean,Mathlib/Algebra/Order/Module/Defs.lean,Mathlib/Algebra/Order/Module/Field.lean,Mathlib/Algebra/Order/Module/OrderedSMul.lean,Mathlib/Algebra/Order/Module/Pointwise.lean,Mathlib/Algebra/Order/Monovary.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Combinatorics/Additive/CovBySMul.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Nat/Factorial/BigOperators.lean,Mathlib/Data/Nat/Factorization/Defs.lean,Mathlib/Data/Nat/Factorization/Induction.lean,Mathlib/Data/Nat/Factorization/Root.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Squarefree.lean,Mathlib/Data/Nat/Totient.lean,Mathlib/NumberTheory/FLT/Polynomial.lean,Mathlib/NumberTheory/FactorisationProperties.lean,Mathlib/NumberTheory/FermatPsp.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean,Mathlib/Tactic/Positivity/Basic.lean,scripts/noshake.json	35	3	['YaelDillies', 'github-actions', 'grunweg']	nobody	0-18484 5 hours ago	0-18492 5 hours ago	0-64021 17 hours
25496	faenuccio author:faenuccio	feat(Algebra/GroupWithZero/Range): the range of a MonoidHom whose codomain is a GroupWithZero as a GroupWithZero when	We define an instance of `GroupWithZero` on the subgroup generated by the range of a MonoidHom taking values in a `GroupWithZero` (by adding a zero to it). Co-authored-by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	265/0	Mathlib/Algebra/GroupWithZero/Range.lean	1	1	['github-actions']	nobody	0-18462 5 hours ago	2-75464 2 days ago	0-4 4 seconds
24454	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): the `rotate_isos` tactic	We define a `rotate_isos` tactic for category theory in mathlib. At its core, the tactic transform terms of type `α(1) ≫ ⋯ ≫ α(k) = β(1) ≫ ⋯ ≫ β(l)` where `α` and `β` are families of morphisms in whith the first `i` morphisms of the left-hand side and the last `j` morphisms of the right-hand side are isomorhisms, into terms of type `α(k-i) ≫ ⋯ ≫ α(k) ≫ inv β(l) ≫ ⋯ ≫ β(l-j+1) = inv α(j) ≫ ⋯ ≫ inv α(1) ≫⋯ ≫ β(l-j)`. The construction of the inverses of expression are caried at the `Expr` levels are built out of the expressions of the morphisms, for instance, for this tactic, the inverse of `F.map (G.map (H.map f.hom)))` will directly be `F.map (G.map (H.map f.inv)))` (which would have to be re-simplified), rather than an `inv` term form an `IsIso` instance. The tactic can be applied at a local hypothesis or at the main goal, or can be used through a `rotate_isos%` term elaborator if e.g one wants to add such a "rotated" form to a `simp` or `rw` call. We also support removing morphisms "from the right" of the lhs, rather than from the right. --- The motivations behind this tactic are the following : - This tactic can "autogenerate" lemmas and terms generalizing lemmas such as [CategoryTheory.Iso.hom_inv_id_app_app_app](https://leanprover-community.github.io/mathlib4_docs/Mathlib/CategoryTheory/NatIso.html#CategoryTheory.Iso.hom_inv_id_app_app_app). This can also generate lemmas `F.map (G.map f.hom) ≫F.map (G.map f.inv) = 𝟙 _`, and can be used to unlock a `simp` call that blocks at an expression of the form `F.map (G.map f.hom) ≫F.map (G.map f.inv) `. - Currently, cancelling morphisms "from the right" in an expression in category theory is a bit of a pain. You have to first reassociate the expression, perform multiple calls to `Iso.inv_comp_eq`, reassociate, etc. This at least automates this process in a fairly straightforward way. - There are expressions in category theory that have no "right forms", e.g the pentagon axiom for monoidal categories, which has many variations in the way one can read the diagram of isomorphisms that represents it. Elaborators such as `rotate_iso%` easily generates all possible forms of such identities from one single form, and avoids having to state multiple forms of the same equality as individual lemmas. - I have been playing with medium-sized diagrams of isomorphisms recently (think for example vertical/horizontal compositions of `CatCommSq`, whiskering a corner of such diagrams, etc.), and it made me wish a lot of time that such easy way to transforms equalities to equivalent forms were available. - [ ] depends on: #24506 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory t-meta awaiting-author blocked-by-other-PR WIP	871/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Core.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,MathlibTest/CategoryTheory/RotateIsos.lean,scripts/noshake.json	7	13	['callesonne', 'github-actions', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	0-18267 5 hours ago	0-20726 5 hours ago	0-495 8 minutes
24845	kebekus author:kebekus	feat: integrability of log ‖meromorphic‖	For real-meromorphic functions `f`, establish interval integrability of `log ‖f ·‖`. In particular, show that `log ∘ sin` is interval integrable. For complex-meromorphic functions `f`, establish circle integrability of `log ‖f ·‖`. At the suggestion of @sgouezel, split the file [Mathlib/Analysis/SpecialFunctions/Integrals.lean](https://github.com/leanprover-community/mathlib4/pull/24845/files#diff-866dd3a7c4603a1a9d9361ee9e58ea2a97ab83d2037e34d5a8ac23862f421c65). The file establishes values of special interval integrals. As a prerequisite, it establishes interval integrability of numerous functions. Interval integrability of `log ‖f ·‖`, which is established in the current PR, naturally fits in there. Adding the material to [Mathlib/Analysis/SpecialFunctions/Integrals.lean](https://github.com/leanprover-community/mathlib4/pull/24845/files#diff-866dd3a7c4603a1a9d9361ee9e58ea2a97ab83d2037e34d5a8ac23862f421c65) did however not seem advisable: - The line of argumentation is different from what is used already, leading to massive new imports and cross-dependencies. - The current file mixes two lines of results of independent interest that have only a clear one-way dependency (integral computation uses integrability) - The file was very long already. As a clean solution, move the material on integrability to a new directory, `Mathlib/Analysis/SpecialFunctions/Integrability`, which contains a file with the original material and another one with the new material. That way, the results on integrability are all in one place and cross-imports are avoided. 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. Integrability of `log ∘ sin` might be useful in future discussions of polylogarithms. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability t-analysis awaiting-author	603/242	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/ExpDeriv.lean,Mathlib/Analysis/SpecialFunctions/Integrability/Basic.lean,Mathlib/Analysis/SpecialFunctions/Integrability/LogMeromorphic.lean,Mathlib/Analysis/SpecialFunctions/Integrals.lean,Mathlib/Analysis/SpecialFunctions/JapaneseBracket.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Deriv.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean	9	39	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'kebekus', 'leanprover-community-bot-assistant', 'sgouezel']	nobody	0-18242 5 hours ago	0-18242 5 hours ago	19-28075 19 days
24823	eric-wieser author:eric-wieser	refactor: add `hom` lemmas for the `MonoidalCategory` structure on `ModuleCat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	148/164	Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Generator.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/Rep.lean	11	20	['101damnations', 'YaelDillies', 'eric-wieser', 'github-actions', 'joelriou', 'kbuzzard', 'leanprover-community-bot-assistant']	101damnations assignee:101damnations	0-17659 4 hours ago	0-17678 4 hours ago	18-13725 18 days
25309	101damnations author:101damnations	feat(RepresentationTheory): `Ind` and `Coind` isomorphism for a finite index subgroup	Given a commutative ring `k`, a finite index subgroup `S ≤ G`, and a `k`-linear `S`-representation `A`, this PR defines an isomorphism $Ind_S^G(A) ≅ Coind_S^G(A).$ Given `g : G` and `a : A`, the forward map sends `⟦g ⊗ₜ[k] a⟧` to the function `G → A`supported at `sg` by `ρ(s)(a)` for `s : S` and which is 0 elsewhere. Meanwhile, the inverse sends `f : G → A` to `∑ᵢ ⟦gᵢ ⊗ₜ[k] f(gᵢ)⟧` for `1 ≤ i ≤ n`, where `g₁, ..., gₙ` is a set of right coset representatives of `S`. --- - [x] depends on: #21732 - [x] depends on: #21733 - [x] depends on: #21735 - [x] depends on: #25307 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	259/0	Mathlib.lean,Mathlib/RepresentationTheory/Shapiro.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-17408 4 hours ago	0-17408 4 hours ago	0-17401 4 hours
25611	erdOne author:erdOne	chore(RingTheory): add `Algebra (FractionRing R) (FractionRing S)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	113/108	Mathlib.lean,Mathlib/Algebra/Algebra/NonZeroDivisors.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/IntegralClosure/IntegralRestrict.lean,Mathlib/RingTheory/Localization/FractionRingAlgebra.lean,Mathlib/RingTheory/Localization/Integral.lean	9	6	['erdOne', 'eric-wieser', 'github-actions']	nobody	0-16100 4 hours ago	0-47505 13 hours ago	0-62245 17 hours
25591	erdOne author:erdOne	feat(RingTheory/DedekindDomain): residue field extension not separable implies divides different	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	159/7	Mathlib/FieldTheory/PurelyInseparable/Basic.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Trace/Basic.lean	3	1	['github-actions']	nobody	0-15923 4 hours ago	1-20822 1 day ago	1-20904 1 day
25622	eric-wieser author:eric-wieser	refactor: overhaul instances on LocalizedModule	This: * Generalizes the `SMul`, `Module`, and `Algebra` instances via appropriate compatibility conditions * Generalizes the `Mul` instance to the non-unital setting * Fixes instances diamonds for the `Nat`- and `Int`-actions --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	167/111	Mathlib/Algebra/Module/LocalizedModule/Basic.lean	1	3	['erdOne', 'eric-wieser', 'github-actions']	nobody	0-15780 4 hours ago	0-16397 4 hours ago	0-23650 6 hours
25606	adomani author:adomani	fix(CI): make autolabel run on `pull_request_target`	Mentioned by Bryan [here](https://github.com/leanprover-community/mathlib4/pull/25599#issuecomment-2954240919). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI awaiting-author	10/2	.github/workflows/add_label_from_diff.yaml	1	3	['bryangingechen', 'github-actions', 'mattrobball']	nobody	0-15576 4 hours ago	0-81570 22 hours ago	0-3768 1 hour
25417	Timeroot author:Timeroot	feat(Analysis/InnerProductSpace): exchange range + ker	``` theorem range_le_range_iff_ker_le_ker {U : E →ₗ[𝕜] E} (hT : T.IsSymmetric) (hU : U.IsSymmetric) : range T ≤ range U ↔ ker U ≤ ker T := by ``` and the forward direction holds in the infinite dimensional case too. Upstreamed from [quantumInfo](https://github.com/Timeroot/Lean-QuantumInfo) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	68/13	Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean	5	18	['Timeroot', 'github-actions', 'j-loreaux']	nobody	0-15010 4 hours ago	0-15010 4 hours ago	0-52027 14 hours
25310	101damnations author:101damnations	refactor(RepresentationTheory/GroupCohomology): refactor low degree group cohomology	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	617/404	Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Functoriality.lean,Mathlib/RepresentationTheory/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Rep.lean	6	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	0-14858 4 hours ago	0-17959 4 hours ago	0-12 12 seconds
25523	kebekus author:kebekus	feat: compute trailing coefficients of factorized rational functions	Compute the trailing coefficient of factorized rational functions. Apply this to compute the trailing coefficient of arbitrary meromorphic functions, presented as a product of a factorized rational and an analytic function. 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. It is one of the ingredients in the proof of Jensen's Formula in complex analysis. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	177/3	Mathlib/Analysis/Meromorphic/FactorizedRational.lean,Mathlib/Analysis/Meromorphic/TrailingCoefficient.lean	2	2	['github-actions', 'sgouezel']	nobody	0-11170 3 hours ago	3-46984 3 days ago	3-47054 3 days
25625	vlad902 author:vlad902	feat(data): List.Chain' helper lemmas	Add two helpers lemmas to go from a positive/negative List.Chain' hypothesis to a concrete goal about two consecutive elements of the list.	t-data	22/0	Mathlib/Data/List/Chain.lean	1	1	['github-actions']	nobody	0-10531 2 hours ago	0-10706 2 hours ago	0-10690 2 hours
25144	wwylele author:wwylele	feat(Algebra/Order): add Archimedean class	This is the first of PRs for Hahn embedding theorem #25140 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	442/0	Mathlib.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean	3	49	['YaelDillies', 'eric-wieser', 'github-actions', 'wwylele']	nobody	0-10157 2 hours ago	0-78434 21 hours ago	16-42508 16 days
25609	Multramate author:Multramate	feat(Algebra/Group/Units/Hom): add map lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra easy label:t-algebra$	21/10	Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean	2	15	['Multramate', 'erdOne', 'github-actions']	nobody	0-9828 2 hours ago	0-9828 2 hours ago	0-9813 2 hours
25010	emilyriehl author:emilyriehl	the homotopy category functor preserves products	This is work in progress with several sorries. Co-authored-by: Dominic Verity and Thomas Murrills --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos large-import t-category-theory WIP	352/4	Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/HoFunctorPreservesBinaryProducts.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/PUnit.lean	5	2	['github-actions']	nobody	0-8426 2 hours ago	6-78765 6 days ago	0-45 45 seconds
24575	pfaffelh author:pfaffelh	feat: introduce Gram matrices	A Gram matrix has entry `⟪v i, v j⟫` at `i j : n`, where `v : n → α` is an `InnerProductSpace 𝕜 α`. Give this notion and show that Gram matrices are positive semi-definite. This will be used later in order to show that the covariance matrix for Brownian Motion is positive semi-definite. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	233/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramMatrix.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/Probability/Process/BrownianMotion.lean	4	98	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'pfaffelh', 'sgouezel']	nobody	0-6958 1 hour ago	0-39923 11 hours ago	20-66528 20 days
24192	alreadydone author:alreadydone	feat(RingTheory): semisimple Wedderburn–Artin existence	--- - [x] depends on: #24119 - [x] depends on: #23963 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	477/61	Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/Order/CompleteSublattice.lean,Mathlib/RingTheory/SimpleModule/Basic.lean,Mathlib/RingTheory/SimpleModule/IsAlgClosed.lean,Mathlib/RingTheory/SimpleModule/Isotypic.lean,Mathlib/RingTheory/SimpleModule/WedderburnArtin.lean	8	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-6831 1 hour ago	0-6877 1 hour ago	22-85358 22 days
24983	alreadydone author:alreadydone	fix(Topology/Covering): switch to standard definition	As discussed in [#mathlib4 > edge cases not covered by `IsCoveringMap` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/edge.20cases.20not.20covered.20by.20.60IsCoveringMap.60/near/518413081), the previous definition doesn't include examples like the inclusion of a one-point space into a two-point discrete space. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	168/54	Mathlib/Topology/Covering.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Homotopy/Lifting.lean	3	6	['alreadydone', 'github-actions', 'leanprover-community-bot-assistant', 'tb65536']	nobody	0-6803 1 hour ago	0-6865 1 hour ago	20-50511 20 days
25626	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/Opposites): monoid objects internal to the monoidal opposite	We construct an equivalence between monoid objects internal to a monoidal category `C`, and monoid objects internal to its monoidal opposite `Cᴹᵒᵖ`. This is done by adding `Mon_Class` and `IsMon_Hom` instance to the relevant objects, as well as by recording an explicit equivalence of categories `Mon_ C ≌ Mon_ Cᴹᵒᵖ`. --- - [ ] depends on: #25549 I made this depend on #25549 rather than making it work with the current def only to have it refactored when #25549 is merged. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	321/173	Mathlib.lean,Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/CategoryTheory/Monad/EquivMon.lean,Mathlib/CategoryTheory/Monoidal/Bimon_.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Comon_.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Mon_.lean,Mathlib/CategoryTheory/Monoidal/CommGrp_.lean,Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Comon_.lean,Mathlib/CategoryTheory/Monoidal/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Internal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Internal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/CategoryTheory/Monoidal/Internal/Types/Basic.lean,Mathlib/CategoryTheory/Monoidal/Mod_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Opposite/Mon_.lean,Mathlib/CategoryTheory/Preadditive/CommGrp_.lean	18	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-6370 1 hour ago	0-6370 1 hour ago	0-1460 24 minutes
24778	YaelDillies author:YaelDillies	feat: `CommGrp`-valued Yoneda embedding	From Toric Co-authored-by: Andrew Yang --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric large-import t-category-theory awaiting-author	65/6	Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/Grp/ForgetCorepresentable.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Category/MonCat/ForgetCorepresentable.lean,Mathlib/CategoryTheory/Preadditive/Yoneda/Basic.lean	5	7	['TwoFX', 'YaelDillies', 'callesonne', 'github-actions', 'leanprover-community-bot-assistant']	nobody	0-6365 1 hour ago	0-8567 2 hours ago	27-7755 27 days
25491	tannerduve author:tannerduve	feat(Control/Monad/Freer): define freer monad, prove it lawful, and implement standard effects	Description: This PR introduces the `Free` monad. This implementation uses the "freer monad" approach as the traditional free monad (eg from [Haskell](https://hackage.haskell.org/package/free-5.2/docs/Control-Monad-Free.html)) is not safely definable in Lean due to termination checking (it's not strictly positive). The main contributions are: * Definition of the `Free` monad as an inductive type which generates a monad given any type constructor `F : Type -> Type`. * Functor and Monad instances for `Free F`, along with proofs of the `LawfulFunctor` and `LawfulMonad` laws. * Canonical instances of `Free` with standard effect signatures: * `FreeState s` for stateful computations, defined via a `StateF s` functor with `get` and `put` operations. * `FreeWriter w` for logging computations, defined via a `WriterF w` functor with a `tell` operation. * `FreeCont r` for continuation-passing computations, using the CPS functor `(α → r) → r`. In this construction, computations are represented as trees of effects. Each node (`liftBind`) represents a request to perform an effect, accompanied by a continuation specifying how the computation proceeds after the effect. The leaves (`pure`) represent completed computations with final results. A key insight is that `FreeM F` satisfies the universal property of free monads: for any monad `M` and effect handler `f : F → M`, there exists a unique way to interpret `FreeM F` computations in `M` that respects the effect semantics given by `f`. This unique interpreter is `mapM f`, which acts as the canonical fold (catamorphism) for free monads. To execute or interpret these computations, we provide two approaches: 1. Hand-written interpreters (`FreeState.run`, `FreeWriter.run`, `FreeCont.run`) that directly pattern-match on the tree structure 2. Canonical interpreters (`FreeState.fold`, `FreeWriter.fold`, `FreeCont.fold`) derived from the universal property via `mapM` And then prove that these approaches are equivalent Footer: This PR adds new files and definitions; no breaking changes. Tags: free monad, freer monad, effect systems, state monad, writer monad, continuation monad, operational semantics, verified interpreters	t-data	696/0	Mathlib.lean,Mathlib/Control/Monad/Free.lean,MathlibTest/freemonad.lean,docs/references.bib	4	79	['copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'plp127', 'quangvdao', 'tannerduve']	nobody	0-5980 1 hour ago	2-82705 2 days ago	4-4789 4 days
25168	wwylele author:wwylele	feat(RingTheorey/HahnSeries): equip HahnSeries with LinearOrder	This is part of #25140. As the future codomain of Hahn embedding theorem, `HahnSeries` needs a linear order. ~~It might be debatable whether the lexicographical order should be the order of `HahnSeries`. Aside from usage in Hahn embedding theorem, this order also represents, for example, the asymptotic behavior around `(x : R) = 0`, so it is generally useful.~~ Updated to add `LinearOrder` on `Lex (HahnSeries _ _)` instead --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	180/0	Mathlib.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Basic.lean,Mathlib/RingTheory/HahnSeries/Lex.lean	4	10	['ScottCarnahan', 'eric-wieser', 'github-actions', 'wwylele']	nobody	0-5576 1 hour ago	15-72780 15 days ago	15-72831 15 days
25455	ADedecker author:ADedecker	feat: refactor and expand lemmas about integration and continuous functional calculus	--- - [ ] depends on: #25458 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis blocked-by-other-PR	807/80	Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean	4	7	['ADedecker', 'dupuisf', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot']	nobody	0-4993 1 hour ago	4-81292 4 days ago	0-0 0 seconds
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	546-18780 1 year ago	546-18943 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	335-23447 11 months ago	335-23470 11 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	313-42773 10 months ago	327-33768 10 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	313-42773 10 months ago	325-54011 10 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	313-42773 10 months ago	326-39154 10 months ago	0-0 0 seconds
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	313-42772 10 months ago	325-20368 10 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	313-42772 10 months ago	346-69469 11 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	313-42772 10 months ago	351-41063 11 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	313-42772 10 months ago	326-30383 10 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	313-42771 10 months ago	325-20502 10 months ago	0-18175 5 hours
13372	adomani author:adomani	dev: generic replacement	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	446/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ReplaceRefine.lean,Mathlib/Tactic/Replacements.lean	4	4	['adomani', 'github-actions']	nobody	313-42771 10 months ago	355-37680 11 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	313-42771 10 months ago	355-37553 11 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	313-42770 10 months ago	363-84158 11 months ago	0-34665 9 hours
12933	grunweg author:grunweg	chore: replace some use of > or ≥ by < or ≤	These were flagged by the linter in #12879: it is easy to simple avoid > or ≥ in hypotheses or `have`s. --- [![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	313-42770 10 months ago	326-52361 10 months ago	0-55655 15 hours
12465	rosborn author:rosborn	style: Change Subtype.val to (↑)	--- This is a test to see replacing `Subtype.val` with `(↑)` where appropriate. After performing the rewrite, some of the types subtly changed in a difficult to detect manner. Before the change, `openEmbedding' _` had type `OpenEmbedding Subtype.val` where `Subtype.val` expanded as `@Subtype.val α fun x ↦ x ∈ U : ↥U → α`. After the change, `Subtype.val` expands to `@Subtype.val α fun x ↦ x ∈ ↑U : { x // x ∈ ↑U } → α`. This caused some later proofs to fail due to the different definition. In a similar case, within the proof of `mfderiv_coe_sphere_injective` on line 553 `Subtype.val` expanded as `@Subtype.val E fun x ↦ x ∈ (Submodule.span ℝ {↑(-v)})ᗮ : ↥(Submodule.span ℝ {↑(-v)})ᗮ → E`. After changing to `(↑)`, it expanded to `@Subtype.val E fun x ↦ x ∈ ↑(Submodule.span ℝ {↑(-v)})ᗮ : { x // x ∈ ↑(Submodule.span ℝ {↑(-v)})ᗮ } → E`. One benefit to using `(↑)` was that it lead to a shorter proof as `ContinuousLinearEquiv.coe_coe` could be removed on line 559. In general, this subtle change in types is basically impossible to detect without a tool like leaff. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	50/50	Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/Normed/Group/Hom.lean,Mathlib/CategoryTheory/Generator.lean,Mathlib/CategoryTheory/Limits/Shapes/Types.lean,Mathlib/CategoryTheory/Subobject/Types.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/GroupTheory/Subsemigroup/Operations.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/Order/Directed.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/Order/RelIso/Set.lean,Mathlib/RingTheory/Artinian.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/PGame.lean,Mathlib/SetTheory/Surreal/Basic.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/Germ.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	28	1	['eric-wieser', 'rosborn']	nobody	313-42770 10 months ago	402-18561 1 year ago	0-0 0 seconds
12528	adomani author:adomani	test: autotranslations Bot --> Top	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	350/294	Mathlib.lean,Mathlib/Order/WithBot.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MinMax.lean,test/MinMax.lean	5	0	[]	nobody	313-42770 10 months ago	383-42912 1 year ago	0-0 0 seconds
12936	mattrobball author:mattrobball	chore(Quiver.Opposite): make `Quiver.Hom.op/unop` `abbrev`'s	These are wrappers around the constructor and projection for `Opposite Quiver.Hom _ _`. The projection itself is reducible and with structure eta built in to defeq it seems like we might be making Lean work harder than is necessary. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	39/34	Mathlib/Algebra/Homology/ShortComplex/Homology.lean,Mathlib/Algebra/Homology/ShortComplex/RightHomology.lean,Mathlib/CategoryTheory/Idempotents/Basic.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Sites/CoverLifting.lean,Mathlib/CategoryTheory/Subobject/Comma.lean,Mathlib/CategoryTheory/Triangulated/Opposite.lean,Mathlib/Combinatorics/Quiver/Basic.lean	10	9	['YaelDillies', 'kim-em', 'leanprover-bot', 'mattrobball']	nobody	313-42770 10 months ago	381-8762 1 year ago	0-0 0 seconds
12934	grunweg author:grunweg	chore: replace more uses of > or ≥ by < or ≤	These were flagged by the linter in https://github.com/leanprover-community/mathlib4/pull/12879: it is easy to simple avoid > or ≥ in hypotheses or haves. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author help-wanted	41/42	Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2019Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib/Tactic/Linarith/Datatypes.lean,test/cancel_denoms.lean,test/congr.lean,test/interval_cases.lean,test/observe.lean	15	11	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'jcommelin', 'urkud']	nobody	313-42770 10 months ago	326-52367 10 months ago	1-73101 1 day
12608	eric-wieser author:eric-wieser	feat: allow `nsmul` / `zsmul` to be omitted again, with a warning	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-meta merge-conflict awaiting-author label:t-algebra$	118/2	Mathlib.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/DefaultFieldLinter.lean,scripts/noshake.json,test/default_field_linter.lean	6	12	['YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions']	nobody	313-42770 10 months ago	362-37834 11 months ago	5-72414 5 days
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	313-42770 10 months ago	401-46346 1 year ago	0-0 0 seconds
12879	grunweg author:grunweg	feat: port ge_or_gt linter from mathlib3	Code works and is essentially green: next step is to split up into separate PRs. Feedback welcome on whether: - all the test changes are good, or I should simply allow it in more cases - if calc blocks need to be explicitly exempt --- - [ ] depends on: #12933 - [ ] depends on: #12934 - [ ] depends on: #12931 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-linter merge-conflict blocked-by-other-PR	736/319	Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q5.lean,Archive/Imo/Imo2019Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BirthdayProblem.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Star/CHSH.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Group/ControlledClosure.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Int/Lemmas.lean,Mathlib/Data/Nat/Dist.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/Parity.lean,Mathlib/Data/Nat/Upto.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/UInt.lean,Mathlib/GroupTheory/Coxeter/Length.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/Rayleigh.lean,Mathlib/Order/Filter/AtTopBot.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/RingTheory/Adjoin/Basic.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CancelDenoms/Core.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/IntervalCases.lean,Mathlib/Tactic/Linarith/Datatypes.lean,Mathlib/Tactic/Linarith/Lemmas.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linter/GeOrGt.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/NormNum/GCD.lean,Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean,Mathlib/Topology/MetricSpace/CauSeqFilter.lean,Mathlib/Topology/MetricSpace/Cauchy.lean,Mathlib/Topology/MetricSpace/Closeds.lean,Mathlib/Topology/Sequences.lean,scripts/lint-style.py,test/Explode.lean,test/GCongr/inequalities.lean,test/GeOrGt.lean,test/LibrarySearch/IsCompact.lean,test/LibrarySearch/basic.lean,test/Recall.lean,test/Rify.lean,test/Use.lean,test/cancel_denoms.lean,test/congr.lean,test/delabLinearIndependent.lean,test/delaborators.lean,test/interval_cases.lean,test/linarith.lean	109	3	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	313-42770 10 months ago	335-23470 11 months ago	0-15202 4 hours
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	313-42770 10 months ago	383-42913 1 year ago	0-0 0 seconds
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	313-42770 10 months ago	335-23470 11 months ago	39-66196 39 days
12679	MichaelStollBayreuth author:MichaelStollBayreuth	perf(NumberTheory/RamificationInertia): speed up slow file	A repetition of the earlier experiment at [#12412](https://github.com/leanprover-community/mathlib4/pull/12412) with Lean 4.8.0-rc1. This time, I tried not to introduce local instances if possible, but instead to tweak instance priorities. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	57/14	Mathlib/NumberTheory/RamificationInertia.lean	1	3	['MichaelStollBayreuth', 'github-actions', 'leanprover-bot']	nobody	313-42770 10 months ago	371-1915 1 year 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	313-42770 10 months ago	335-23470 11 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	313-42770 10 months ago	405-44768 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	313-42769 10 months ago	325-20636 10 months ago	1-21749 1 day
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	313-42769 10 months ago	333-81932 10 months ago	10-75677 10 days
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	313-42769 10 months ago	435-80899 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	313-42769 10 months ago	335-23470 11 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	313-42769 10 months ago	418-33976 1 year ago	0-0 0 seconds
11100	eric-wieser author:eric-wieser	feat(CategoryTheory/Limits): add `Functor.mapBinaryBiconeInv`	--- - [ ] depends on: #11130 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) It's tempting to try to prove something like ```lean theorem Functor.mapBinaryBiconeInv_toCone [Limits.HasZeroMorphisms C] [Limits.HasZeroMorphisms D] (e : D ⥤ C) [IsEquivalence e] {X Y : D} (b : BinaryBicone (e.obj X) (e.obj Y)) : (e.mapBinaryBiconeInv b).toCone = (e.mapConeInv <\| (Cones.postcompose (pairComp X Y e).symm.hom).obj b.toCone) := by simp sorry theorem Functor.mapBinaryBiconeInv_toCocone [Limits.HasZeroMorphisms C] [Limits.HasZeroMorphisms D] (e : D ⥤ C) [IsEquivalence e] {X Y : D} (b : BinaryBicone (e.obj X) (e.obj Y)) : (e.mapBinaryBiconeInv b).toCocone = (e.mapCoconeInv <\| (Cocones.precompose (pairComp X Y e).hom).obj b.toCocone) := by sorry ``` but maybe equality is evil here	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	313-42768 10 months ago	335-23470 11 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	313-42768 10 months ago	468-67301 1 year 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	313-42768 10 months ago	369-37814 1 year 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	313-42768 10 months ago	377-45989 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	313-42768 10 months ago	335-23470 11 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	313-42768 10 months ago	402-19069 1 year ago	22-57316 22 days
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	313-42768 10 months ago	420-56830 1 year ago	1-29105 1 day
10024	ADedecker author:ADedecker	feat: rename `connectedComponentOfOne` to `identityComponent`, prove that it is normal and open	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-CI merge-conflict	58/24	Mathlib/FieldTheory/AbsoluteGaloisGroup.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Group/TopologicalAbelianization.lean,Mathlib/Topology/Algebra/OpenSubgroup.lean,Mathlib/Topology/Connected/Basic.lean	5	0	[]	nobody	313-42768 10 months ago	325-21225 10 months ago	0-832 13 minutes
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	313-42768 10 months ago	438-28660 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	313-42768 10 months ago	335-23470 11 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	313-42768 10 months ago	335-23470 11 months ago	64-12826 64 days
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	313-42768 10 months ago	374-66427 1 year 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	313-42767 10 months ago	335-23470 11 months ago	0-0 0 seconds
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	313-42767 10 months ago	462-15082 1 year ago	5-6524 5 days
8788	FMLJohn author:FMLJohn	feat(Algebra/Module/GradeZeroModule): if `A` is a graded semiring and `M` is a graded `A`-module, then each grade of `M` is a module over the 0-th grade of `A`.	--- - [ ] depends on: #8187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	313-42767 10 months ago	347-30669 11 months ago	0-0 0 seconds
8906	jjaassoonn author:jjaassoonn	feat: add some missing lemmas about linear algebra	--- - [ ] depends on: #8905 [lifting injective modules to higher universe] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	45/1	Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/LinearAlgebra/Basic.lean,Mathlib/LinearAlgebra/BilinearMap.lean	4	21	['AntoineChambert-Loir', 'alreadydone', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	313-42767 10 months ago	414-78896 1 year 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	313-42767 10 months ago	501-35011 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	313-42767 10 months ago	494-50895 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	313-42767 10 months ago	477-32484 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	313-42767 10 months ago	444-9456 1 year ago	22-72922 22 days
9356	alexjbest author:alexjbest	feat: assumption?	A little helper for replacing `assumption`s with `exact` statements quickly --- If this is approved I will add tests This begs the question of whether it might simply be better to add some sort of code action for "replace with trythis output" [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	313-42767 10 months ago	496-63164 1 year ago	19-26304 19 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	313-42767 10 months ago	564-29623 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	313-42767 10 months ago	363-21421 11 months ago	29-65537 29 days
8503	thorimur author:thorimur	feat: meta utils for `refine?`	This PR introduces some metaprogramming infrastructure and utilities that are necessary for `refine?` (#8364). * `elabTermWithHoles'` (and `withCollectingNewGoalsFrom'`): a more configurable version of `elabTermWithHoles`, which allows: preserving the initial mvar type; not tagging untagged goals; and postponing mvars. * Some `Syntax` and `TSyntax` functionality, including: * `TSyntax.map`(`M`), for acting on `TSyntax` with functions `f : Syntax -> (m) Syntax` * Range operations: `includes` and `isEqByRange` * `setTrailingInfoBy?` and `unsetOriginalTrailing`, which is like `unsetTrailing`, but behaves as expected. * `Term.withoutModifyingState`, which does not allow unknown mvarIds to escape via the infotree * `hasNewErrors`, which runs a monad computation and returns the value along with `true` or `false` depending on whether new error messages have been logged * the option `pp.anonymousMVarSuffixes`, which can be set to `false` to replace all numeric suffixes of anonymous mvars with `✝`, which is useful in tandem with `#guard_msgs` for tests (but is essentially a workaround—although it can make some tactic states more legible). --- I'm open to suggestions on the location and name of the option/delaborator used for trimming the numeric suffixes of anonymous mvar names (which is used in the tests)—including whether or not it should exist in the first place, as it's essentially just a workaround. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author	312/5	Mathlib.lean,Mathlib/Lean/CoreM.lean,Mathlib/Lean/Elab/Tactic/ElabTerm.lean,Mathlib/Lean/Elab/Term.lean,Mathlib/Util/Delaborators.lean,Mathlib/Util/Syntax.lean	6	2	['kmill', 'thorimur']	kmill assignee:kmill	313-42767 10 months ago	515-53065 1 year ago	38-46649 38 days
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	313-42767 10 months ago	371-86192 1 year ago	0-0 0 seconds
9339	FMLJohn author:FMLJohn	feat (RingTheory/GradedAlgebra/HomogeneousIdeal): given a finitely generated homogeneous ideal of a graded semiring, construct a finite spanning set for the ideal which only contains homogeneous elements	--- - [ ] depends on: #8187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	313-42767 10 months ago	347-30684 11 months ago	0-0 0 seconds
9564	AntoineChambert-Loir author:AntoineChambert-Loir	weaken commutativity assumptions for AdjoinRoot.lift and AdjoinRoot.liftHom	I weaken a commutativity assumption for docs#AdjoinRoot.liftHom that the target algebra be commutative. It is only assumed to be a Semiring. For that, I need to generalize docs#AdjoinRoot.lift which takes `i : R ->+* S`, `a : S` with `f.eval₂ i a = 0` and defines `AdjoinRoot f ->+* S` that extends `i ` and sends `AdjoinRoot.root f` to `a`. --- The initial version of the PR was to define `AdjoinRoot.lift'` where `S` is only a Semiring, with the additional assumption `hcomm : ∀ r, Commute (i r) a` that the element `a` commutes with the image of `i`. @jcommelin suggested to provide this argument as an `autoParam`, filled in by an ad hoc `commutativity` tactic. However, such an argument cannot be made implicit and a first version required to have this argument given each time, most of the time by `_`, even for all subsequent lemmas, `AdjoinRoot.lift_mk`, etc. To avoid this, I tried to make this assumption a `⦃hcomm : ∀ r, Commute (i r) a⦄`. This appears to have some side effects that proofs using an `exact` tactic or in term mode do not work well, but one can resort on `by simp […]`. Maybe @eric-wieser or @Vierkantor will have opinions on that. In some cases one can still give the argument as `(hcomm := by commutativity)`. (There are 3 options : - separate lemmas for the fully commutative case and for the case where a proof is needed - using the `commutativity` tactic, but with an argument `_` sometimes - using the optional argument.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	146/30	Mathlib.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Commutativity.lean,Mathlib/Tactic/Commutativity/Init.lean	8	14	['AntoineChambert-Loir', 'Vierkantor', 'eric-wieser', 'jcommelin']	nobody	313-42767 10 months ago	335-23470 11 months ago	16-24540 16 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	313-42767 10 months ago	406-32973 1 year 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	313-42767 10 months ago	564-47945 1 year ago *	0-0 0 seconds *
9487	eric-wieser author:eric-wieser	feat: the exponential of dual numbers over non-commutative rings	This is a work in progress, as I don't know my way around the measure theory library. --- - [x] depends on: #9489 - [x] depends on: #9486 - [x] depends on: #10427 - [ ] depends on: #10452 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability t-algebra t-analysis merge-conflict WIP label:t-algebra$	97/0	Mathlib/Analysis/NormedSpace/TrivSqZeroExt.lean	1	7	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	313-42767 10 months ago	318-37836 10 months ago	0-0 0 seconds
9504	alreadydone author:alreadydone	chore: remove some IsSeparable assumptions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	41/14	Mathlib/NumberTheory/NumberField/Norm.lean,Mathlib/RingTheory/Norm.lean	2	0	[]	nobody	313-42767 10 months ago	402-17551 1 year ago	0-0 0 seconds
9482	yuma-mizuno author:yuma-mizuno	refactor(CategoryTheory/Monoidal): add `LaxMonoidalStruct`	Add a `LaxMonoidalStruct` with only the unit morphism `ε` and the tensorator `μ`. This is used in #6307 to provide two different constructors for `LaxMonoidal` that have common `ε` and `μ` but use the tensor of morphisms or the whiskerings. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	21/8	Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/CategoryTheory/Monoidal/Functorial.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean	3	0	[]	nobody	313-42767 10 months ago	501-46616 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	313-42767 10 months ago	491-22669 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	313-42766 10 months ago	325-21483 10 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	313-42766 10 months ago	335-23470 11 months ago	6-59794 6 days
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	313-42766 10 months ago	443-6032 1 year ago	30-30522 30 days
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	313-42766 10 months ago	516-24202 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	313-42766 10 months ago	588-69207 1 year ago	0-72515 20 hours
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	313-42766 10 months ago	507-21671 1 year 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	313-42766 10 months ago	335-23470 11 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	313-42766 10 months ago	335-23470 11 months ago	35-56459 35 days
7615	eric-wieser author:eric-wieser	chore(LinearAlgebra/Basic): generalize compatibleMaps to semilinear maps	Spotted while reviewing #7611 --- - [x] depends on: #7611 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI easy merge-conflict label:t-algebra$	9/33	Mathlib/LinearAlgebra/Basic.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	313-42766 10 months ago	335-23470 11 months ago	0-0 0 seconds
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	313-42766 10 months ago	335-23470 11 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	313-42766 10 months ago	335-23470 11 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	313-42766 10 months ago	455-49099 1 year ago	0-0 0 seconds
7427	MohanadAhmed author:MohanadAhmed	Mohanad ahmed/sort eigenvalues abs	In the file `Analysis.InnerProductSpace.Spectrum` todo notes were left saying: > TODO Postcompose with a permutation so that these eigenvectors are listed in increasing order of eigenvalue. > TODO Postcompose with a permutation so that these eigenvalues are listed in increasing order. - This is a start in that direction --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	162/4	Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/NormedSpace/PiLp.lean,Mathlib/LinearAlgebra/Matrix/Spectrum.lean	3	0	[]	nobody	313-42766 10 months ago	490-69463 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	313-42766 10 months ago	333-82625 10 months ago	1-85757 1 day
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	313-42766 10 months ago	587-48606 1 year ago	0-62955 17 hours
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	313-42766 10 months ago	630-10626 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	313-42766 10 months ago	370-53758 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	313-42766 10 months ago	644-16789 1 year ago	0-0 0 seconds
6931	urkud author:urkud	refactor(Analysis/Normed): use `RingHomIsometric` for `.norm_cast`	--- I don't understand why linter fails. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict help-wanted	78/68	Mathlib/Analysis/LocallyConvex/ContinuousOfBounded.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/NormedSpace/Basic.lean,Mathlib/Analysis/NormedSpace/Exponential.lean,Mathlib/Analysis/NormedSpace/Spectrum.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean	8	0	[]	nobody	313-42766 10 months ago	335-23470 11 months ago	0-0 0 seconds
6580	adomani author:adomani	chore: `move_add`-driven replacements	This PR accompanies #6576 and uses `move_add/mul` to simplify/streamline a selection of proofs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	12/13	Counterexamples/Monic_nonRegular.lean,Mathlib/Algebra/Associated.lean,Mathlib/Data/Polynomial/RingDivision.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean	4	0	[]	nobody	313-42766 10 months ago	430-31198 1 year 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	313-42766 10 months ago	325-21355 10 months 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	313-42766 10 months ago	375-20407 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	313-42766 10 months ago	474-78178 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	313-42765 10 months ago	354-40193 11 months 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	313-42765 10 months ago	377-45989 1 year 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	313-42765 10 months ago	578-32362 1 year ago	9-67365 9 days
6195	eric-wieser author:eric-wieser	chore(RingTheory/TensorProduct): golf the `mul` definition	--- - [x] depends on: #6211 - [x] depends on: #6187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Strangely this causes a timeout downstream	t-algebra awaiting-CI merge-conflict label:t-algebra$	4/29	Mathlib/RingTheory/TensorProduct.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	313-42765 10 months ago	335-23470 11 months 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	313-42765 10 months ago	587-49372 1 year ago	3-26416 3 days
3575	Kha author:Kha	perf: selectively enable precompilation	--- This is an initial performance test on Linux. TODO: - [ ] test on macOS and Windows as well - [ ] adapt caching	merge-conflict WIP	3/0	lakefile.lean	1	21	['Kha', 'kim-em', 'leanprover-bot', 'tydeu']	nobody	313-42765 10 months ago	345-16360 11 months 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	313-42765 10 months ago	635-62140 1 year 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` * `$LLM_MODELS/7B/ggml-model-q4_0.bin` ``` Currently there are not user-configurable hooks to pick which LLM to use: it checks the conditions described in those bullet points, and takes the first one it finds. (i.e. if you want to use the LLaMa `7B/ggml-model-q4_0.bin`, you have to remove your OpenAI API key!). However a tactic in a downstream project (e.g. mathlib) can specify which interface and model it wants to use, or just call `findChatBot` for the behaviour described in that message. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author	180/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Formalize.lean,lake-manifest.json,lakefile.lean,test/formalize.lean	6	2	['digama0', 'jcommelin']	nobody	313-42765 10 months ago	633-45893 1 year ago	124-45187 124 days
5133	kmill author:kmill	feat: IntermediateField adjoin syntax for sets of elements	Adds support for both `F⟮S⟯` and `F⟮α⟯`. The term `x` in `F⟮x⟯` is elaborated, and if it has type `Set _` the first interpretation is used, and otherwise the second is. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	110/55	Mathlib/FieldTheory/Adjoin.lean	1	0	[]	nobody	313-42765 10 months ago	668-81029 1 year ago	0-0 0 seconds
4775	thorimur author:thorimur	feat: `SubExpr` utilities	This file contains utilities for handling positions in expressions, including folding over subexpressions along with their positions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict WIP	148/0	Mathlib.lean,Mathlib/Lean/SubExpr.lean	2	0	[]	nobody	313-42765 10 months ago	733-54081 2 years 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	313-42765 10 months ago	521-62957 1 year 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	313-42765 10 months ago	371-86235 1 year ago	13-18399 13 days
7076	grunweg author:grunweg	feat: define measure zero subsets of a manifold	A topological manifold has no canonical measure, but there is a canonical notion of measure zero subsets. We show that these are closed under subsets and countable unions (hence define a filter, the almost everywhere filter) and that a closed nowhere dense has empty interior. This is necessary for stating the general version of Sard's theorem (in finite dimensions), and a first step towards its proof. This code was written at LftCM 2023. Thanks for @fpvandoorn for mentoring me! :heart: --- Unresolved questions/looking for feedback - Is "measure zero" a good name or would "null set" be better? I tend towards the former, but welcome input from a measure theorist (which I'm not). - What is the correct definition? One could also define "measure zero" using any `IsOpenPosMeasure` on the charted space. I think all results in this file still hold then, but for applications (e.g., Sard's theorem), this might be too general. - define custom notation, similar to the a.e. filter on a measure space? (We could include $J$ instead of $\mu$.) - what's the right syntax for formulas in docstrings --- use LaTeX or backticks? I don't know how to preview the generated docs, the guidelines are a bit ambiguous for me.	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	313-42765 10 months ago	352-38576 11 months ago	43-56043 43 days
6307	yuma-mizuno author:yuma-mizuno	refactor(CategoryTheory/Monoidal): add whiskering operators	We introduce whiskering operators. This allows us to introduce a simp-normal form for morphisms in monoidal categories. Rewriting into simp-normal forms is especially useful when combined with the coherence tactic. --- - [x] depends on: #6420 - [x] depends on: #8191 - [x] depends on: #9988 - [x] depends on: #9991 - [x] depends on: #9995 - [x] depends on: #10061 - [x] depends on: #10078 - [x] depends on: #10898 - [x] depends on: #10912 - [x] depends on: #11223 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict awaiting-author	325/280	Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/Closed/Ideal.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/NaturalTransformation.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,test/CategoryTheory/Coherence.lean	15	38	['eric-wieser', 'github-actions', 'grunweg', 'jcommelin', 'kim-em', 'leanprover-community-mathlib4-bot', 'yuma-mizuno']	nobody	313-42765 10 months ago	328-55594 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	313-42765 10 months ago	660-4290 1 year ago	0-19160 5 hours
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	313-42765 10 months ago	371-86255 1 year ago	0-0 0 seconds
6993	jjaassoonn author:jjaassoonn	feat : lemmas about `AddMonoidAlgebra.{divOf, modOf}`	--- - [x] depends on: #7582 - [x] depends on: #8975 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	147/3	Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/MvPolynomial/Basic.lean,Mathlib/Data/MvPolynomial/CommRing.lean,Mathlib/Data/MvPolynomial/Division.lean	5	42	['YaelDillies', 'alreadydone', 'digama0', 'eric-wieser', 'github-actions', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	313-42765 10 months ago	335-23470 11 months ago	102-21189 102 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	313-42765 10 months ago	335-23470 11 months ago	83-76369 83 days
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	313-42765 10 months ago	664-10406 1 year ago	0-0 0 seconds
6210	MohanadAhmed author:MohanadAhmed	feat(Data/IsROrC/Basic): add a `StarOrderedRing` instance	This PR implements a suggestion by @urkud on [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/PartialOrder.20and.20StarOrderedRing.20on.20IsROrC) on how to get a `StarOrderedRing` on the `IsROrC` class. In that discussion the suggested step were: 1. Add PartialOrder K to the list of extends and add le_iff_re_im : z ≤ w ↔ re z ≤ re w ∧ im z = im w to the list of axioms. 2. Prove StarOrderedRing instance for any IsROrC. 3. Add (almost trivial) le_iff_re_im proofs to IsROrC instances for real and complex numbers. This PR does exactly these three steps --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	313-42765 10 months ago	664-45902 1 year ago	0-4269 1 hour
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	313-42765 10 months ago	587-49373 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	313-42765 10 months ago	539-74632 1 year ago	0-0 0 seconds
5934	eric-wieser author:eric-wieser	feat: port Data.Rat.MetaDefs	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This needs some eyes from people familiar with Qq	t-meta merge-conflict mathlib-port help-wanted	183/0	Mathlib.lean,Mathlib/Data/Rat/MetaDefs.lean,test/rat.lean	3	4	['eric-wieser', 'gebner']	nobody	313-42765 10 months ago	483-29754 1 year ago	0-0 0 seconds
4960	eric-wieser author:eric-wieser	chore: use `open scoped`	Earlier versions of mathport did not know about this. This was done by searching for all `open` commands referencing: * `Classical` * `BigOperators` * `Topology` * `Pointwise` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI merge-conflict	1026/981	Mathlib/Algebra/AddTorsor.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/NatAntidiagonal.lean,Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/BigOperators/Order.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring.lean,Mathlib/Algebra/BigOperators/RingEquiv.lean,Mathlib/Algebra/Bounds.lean,Mathlib/Algebra/Category/GroupCat/Biproducts.lean,Mathlib/Algebra/Category/GroupCat/FilteredColimits.lean,Mathlib/Algebra/Category/GroupCat/Injective.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Biproducts.lean,Mathlib/Algebra/Category/Mon/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Adjunctions.lean,Mathlib/Algebra/Category/Ring/FilteredColimits.lean,Mathlib/Algebra/CharP/Basic.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/DirectLimit.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/GCDMonoid/Div.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Commute.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Homology/Additive.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/Homology.lean,Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Algebra/Homology/HomotopyCategory.lean,Mathlib/Algebra/Homology/ImageToKernel.lean,Mathlib/Algebra/IndicatorFunction.lean,Mathlib/Algebra/LinearRecurrence.lean,Mathlib/Algebra/Module/BigOperators.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/Algebra/Module/LinearMap.lean,Mathlib/Algebra/Module/PointwisePi.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/Module.lean,Mathlib/Algebra/Order/Pointwise.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Order/SMul.lean,Mathlib/Algebra/Order/UpperLower.lean,Mathlib/Algebra/Periodic.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/GroupRingAction.lean,Mathlib/Algebra/Star/BigOperators.lean,Mathlib/Algebra/Star/Pointwise.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/Algebra/Support.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/Algebra/Tropical/BigOperators.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/Basic.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/Maximal.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/AlgebraicTopology/AlternatingFaceMapComplex.lean,Mathlib/AlgebraicTopology/ExtraDegeneracy.lean,Mathlib/AlgebraicTopology/TopologicalSimplex.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/Asymptotics.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Filter.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/BoxIntegral/Partition/SubboxInduction.lean,Mathlib/Analysis/BoxIntegral/Partition/Tagged.lean,Mathlib/Analysis/Calculus/ContDiffDef.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean	788	0	[]	nobody	313-42765 10 months ago	335-23470 11 months ago	0-0 0 seconds
6079	eric-wieser author:eric-wieser	fix: deduplicate variables	`variables {A} [Ring A]` meant "update the binder of `A`" in Lean 3, but now means "create a duplicate variable called `A`" (or at least, does so when inspecting the state within the variables line). This removes a number of porting notes that were stumbling over this behavior. [Related Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/unexpected.20.60variable.60.20behaviour.3F/near/360154080) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI merge-conflict	1012/443	Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/CharP/Basic.lean,Mathlib/Algebra/CovariantAndContravariant.lean,Mathlib/Algebra/DirectLimit.lean,Mathlib/Algebra/DirectSum/Finsupp.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Group/Pi.lean,Mathlib/Algebra/GroupPower/Basic.lean,Mathlib/Algebra/GroupPower/Lemmas.lean,Mathlib/Algebra/Hom/Aut.lean,Mathlib/Algebra/Hom/Equiv/Basic.lean,Mathlib/Algebra/Hom/Group.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory.lean,Mathlib/Algebra/Homology/ImageToKernel.lean,Mathlib/Algebra/Homology/ShortComplex/LeftHomology.lean,Mathlib/Algebra/IndicatorFunction.lean,Mathlib/Algebra/Jordan/Basic.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Algebra/Module/LinearMap.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Order/Ring/Lemmas.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/SMulWithZero.lean,Mathlib/Algebra/Star/Module.lean,Mathlib/Algebra/Support.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Point.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicTopology/DoldKan/Decomposition.lean,Mathlib/AlgebraicTopology/MooreComplex.lean,Mathlib/Analysis/Calculus/ContDiff.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Calculus/LocalExtr.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Extreme.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Hull.lean,Mathlib/Analysis/Convex/Independent.lean,Mathlib/Analysis/Convex/Intrinsic.lean,Mathlib/Analysis/Convex/Join.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/BalancedCoreHull.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/LocallyConvex/Bounded.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/Analysis/Normed/Group/Hom.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/NormedSpace/Completion.lean,Mathlib/Analysis/NormedSpace/LinearIsometry.lean,Mathlib/Analysis/NormedSpace/Multilinear.lean,Mathlib/Analysis/NormedSpace/OperatorNorm.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/CategoryTheory/Action.lean,Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation.lean,Mathlib/CategoryTheory/Closed/Ideal.lean,Mathlib/CategoryTheory/ConcreteCategory/UnbundledHom.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Endofunctor/Algebra.lean,Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/FullSubcategory.lean,Mathlib/CategoryTheory/Functor/Category.lean,Mathlib/CategoryTheory/Limits/Fubini.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Biproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Images.lean,Mathlib/CategoryTheory/Limits/Shapes/WidePullbacks.lean,Mathlib/CategoryTheory/Linear/LinearFunctor.lean,Mathlib/CategoryTheory/Localization/Construction.lean,Mathlib/CategoryTheory/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean	302	1	['timotree3']	nobody	313-42765 10 months ago	335-23470 11 months ago	0-0 0 seconds
4871	j-loreaux author:j-loreaux	feat: define the additive submonoid of positive elements in a star ordered ring	This file defines the `AddSubmonoid` of nonegative elements `StarOrderedRing.positive R` in a star ordered ring `R` with carrier `{ x : R \| 0 ≤ x }` (in fact, the definition only requires `OrderedAddCommMonoid R` to allow for other use cases, but it is primarily intended for `StarOrderedRing R`). Equivalently, this is the `AddSubmonoid` generated by the elements of the form `star s * s`. Even though this technically corresponds to the nonnegative elements, the "positive" terminology is standard throughout the literature (at least in C⋆-algebra theory and operator theory), so we choose to prefer that. The advantage of using this over other definitions of positivity is that it allows us to unify several different concepts under a single umbrella. For example, one might be tempted to consider the collection of bounded linear operators on an Hilbert space and define positivity as `∀ x, 0 ≤ ⟪T x, x⟫`, but this doesn't generalize nicely to C⋆-algebras. Alternatively, one could define positivity as those self-adjoint elements with nonnegative spectrum, but this requires the algebra to be unital. Our definition herein conveniently sidesteps these issues. --- Note: I declared the `AddMonoidWithOne` and `AddGroupWithOne` instances for `selfAdjoint R` separately because it made the proof of the latter easier. - [x] depends on: #6229 - [x] depends on: #10209 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	313-42765 10 months ago	335-23470 11 months ago	5-55287 5 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	313-42764 10 months ago	565-53950 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	309-19074 10 months ago	309-19074 10 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	309-12754 10 months ago	309-12755 10 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	306-30743 10 months ago	306-30743 10 months ago	0-0 0 seconds
14994	kim-em author:kim-em	profiling: skipKernelTC		merge-conflict	2/1	lakefile.lean	1	3	['github-actions', 'kim-em', 'leanprover-bot']	nobody	304-62887 10 months ago	304-62887 10 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	301-23837 9 months ago	306-60859 10 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	301-19376 9 months ago	301-19376 9 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	301-15084 9 months ago	301-15084 9 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	301-687 9 months ago	301-687 9 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	300-86319 9 months ago	300-86319 9 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	299-36419 9 months ago	299-36419 9 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	299-36310 9 months ago	299-36310 9 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	299-35843 9 months ago	299-35843 9 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	299-34242 9 months ago	299-34242 9 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	299-21006 9 months ago	299-21006 9 months ago	0-0 0 seconds
14308	grhkm21 author:grhkm21	feat(Algebra/Category): Direct construction of colimits in algebraic categories	(Below I only write about colimits since that's what I'm familiar with after working on it the last few days, but maybe it's the same for other categorical constructions) Main feature: Construct colimits in `AddCommGrp`/`ModuleCat`/`FGModuleCat`(/...) directly as coequalizer (i.e. cokernel i.e. quotient) of two maps, allowing one to say $\coprod_j M_j \cong $ Currently, if you look at how colimits are constructed for [AddCommGrp](https://github.com/leanprover-community/mathlib4/blob/master/Mathlib/Algebra/Category/Grp/Colimits.lean#L69-L92), you see this massive block of code of all relations generating the quotient relation, but that's kind of bad, you can't say anything concretely about it. Also as noted in the TODOs of a few files: ``` TODO: In fact, in `ModuleCat R` there is a much nicer model of colimits as quotients of finitely supported functions, and we really should implement this as well. ``` I wrote it down [here](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Braided.20left.20rigid.20categories.20are.20right.20rigid/near/447490672), and have formalised it* in a small file already [here](https://gist.github.com/grhkm21/5b2d938753c0ce0900d21c93a39e3b7d#file-addcommgrpcolimits-lean-L162-L163) (I also have a `ModuleCat` version, and proving existence of colimits in `FGModuleCat` from it). Usually I will try to merge the file into Mathlib directly (preferably in one sitting), but I have been trying for a while now and been struggling. One issue is I am struggling to understand universes, which I asked [here](https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Universe.20constraints!/near/448049266) along with many other places. A more concrete issue is that - [ ] FGModuleCat (and `FullSubcategory` in general) requires morphism and objects to be on the same universe, whereas generally `Category.{v, u}` don't. So that seems to limit what I can express, and maybe I have to fix it first. Here are a few more TODOs just so I don't forget, probably done before the one above: - [ ] Generalise `cokernelIsoQuotient` to other categories. - [ ] Also prove `coproductIsoDirectSum` - [ ] Also prove coequalizer (f + h) (g + h) ~ coequalizer f g ~ cokernel (f - g) 0 - [ ] Fix typo `FGModuleCatCat` If anyone is familiar with universe stuff and can answer my many questions that'll be great too. I need help understanding just [these five lines](https://github.com/leanprover-community/mathlib4/blob/master/Mathlib/Algebra/Category/Grp/Colimits.lean#L267-L271)	t-algebra merge-conflict WIP label:t-algebra$	10/3	Mathlib/Algebra/DirectSum/Module.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean	2	1	['github-actions']	nobody	298-33027 9 months ago	298-33027 9 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	298-32942 9 months ago	298-32942 9 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	298-32941 9 months ago	298-32941 9 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	298-32941 9 months ago	298-32941 9 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	298-32824 9 months ago	298-32824 9 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	298-32687 9 months ago	298-32687 9 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	298-32672 9 months ago	298-32672 9 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	298-32634 9 months ago	298-32634 9 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	298-32624 9 months ago	298-32624 9 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	298-32610 9 months ago	298-32610 9 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	298-32600 9 months ago	298-32600 9 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	298-32561 9 months ago	298-32561 9 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	298-32519 9 months ago	298-32519 9 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	298-32484 9 months ago	298-32484 9 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	298-32452 9 months ago	298-32452 9 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	298-32306 9 months ago	298-32306 9 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	298-32248 9 months ago	298-32248 9 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	298-32129 9 months ago	298-32129 9 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	298-32097 9 months ago	298-32097 9 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	298-32071 9 months ago	298-32071 9 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	298-32060 9 months ago	298-32060 9 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	298-32016 9 months ago	298-32016 9 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	298-32010 9 months ago	298-32010 9 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	298-31884 9 months ago	298-31884 9 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	298-31878 9 months ago	298-31878 9 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	298-31850 9 months ago	298-31850 9 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	296-64286 9 months ago	296-64286 9 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	296-64286 9 months ago	296-64286 9 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	294-85734 9 months ago	325-21094 10 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	294-85555 9 months ago	335-23470 11 months ago	1-84718 1 day
11964	adamtopaz author:adamtopaz	feat: The functor of points of a scheme	We construct the functor of points functor, and prove that it's full and faithful. --- - [ ] depends on: #11947 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-category-theory merge-conflict	210/0	Mathlib.lean,Mathlib/AlgebraicGeometry/FunctorOfPoints.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean	3	4	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	294-85414 9 months ago	335-23470 11 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	294-85313 9 months ago	335-23470 11 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	294-85105 9 months ago	294-85105 9 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	294-84416 9 months ago	294-84416 9 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	294-62979 9 months ago	294-62979 9 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	294-40103 9 months ago	294-44017 9 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	294-20067 9 months ago	299-36309 9 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	294-19901 9 months ago	325-21226 10 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	294-9120 9 months ago	294-84667 9 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	292-22350 9 months ago	335-23470 11 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	292-22341 9 months ago	299-36311 9 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	292-22321 9 months ago	298-32916 9 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	292-22159 9 months ago	371-11749 1 year ago	65-20427 65 days
13155	alreadydone author:alreadydone	feat(NumberTheory/EllipticDivisibilitySequence): show elliptic relations follow from even-odd recursion	This PR is centered around the (generalized) elliptic relations (`rel₄`) $E(a,b,c,d): W_{a+b}W_{a-b}W_{c+d}W_{c-d}=W_{a+c}W_{a-c}W_{b+d}W_{b-d}-W_{a+d}W_{a-d}W_{b+c}W_{b-c}$. For an integer-indexed sequence W valued in a commutative ring, the relation makes sense only when a,b,c,d are all integers or all half integers. For convenience of formalization, we instead consider integers a,b,c,d of the same parity and divide all subscripts by 2. We extract the subexpression $W_{(a+b)/2}W_{(a-b)/2}$ (which appear six times) as `addMulSub W a b`. The collection of all $E(a,b,c,d)$ is equivalent to Stange's axiom for elliptic nets (`net`), and the literature (e.g. Silverman) commonly consider only the three-index special case $E(m,n,r,0)$ (`Rel₃`). Important special cases of these relations are (i) $E(m+1,m,1,0): W_{2m+1}W_1^3=W_{m+2}W_m^3-W_{m+1}^3 W_{m-1}$ (`oddRec`) and (ii) $E(m+1,m-1,1,0): W_{2m}W_2 W_1^2=W_m(W_{m+2}W_{m-1}^2-W_{m-2}W_{m+1}^2)$ (`evenRec`), which suffice to uniquely specify $W$ on all positive integers recursively from four initial values $W_1, W_2, W_3, W_4$ (`IsEllSequence.ext`, if $W_1 W_2$ is not a zero divisor). In the usual setting where $W_1=1$ and $W_2\mid W_4$, there does exist a sequence (`normEDS`) satisfying (i) and (ii) given initial values $W_2, W_3$ and $W_4/W_2$. It turns out the same non-zerodivisor condition also guarantees that W is an odd function with $W_0=0$, which naturally extends W to all integers. The main result of this PR (`rel₄_of_oddRec_evenRec`, `IsEllSequence.of_oddRec_evenRec`) is a purely algebraic proof that the sequence W defined by the single-parameter elliptic relations (i) and (ii) implies all $E(a,b,c,d)$, based on my original argument first published on [Math.SE](https://math.stackexchange.com/a/4903422/12932). It's based on the observation that a nonzerodivisor-multiple of $E(a,b,c,d)$ can be expressed as a linear combination of various $E(a,b,c_\min,d_\min)$ with the two smallest indices fixed at their minimal possible values, which can be transformed (`transf`) to an elliptic relation with smaller `a` (which can be assumed to hold by induction), unless they are of the form (i) or (ii) which hold by assumption. For this argument it's necessary to assume `a > b > c > d ≥ 0` (see `StrictAnti₄` and `Rel₄OfValid`), but it's easy to extend to arbitrary a,b,c,d by symmetry properties of `rel₄` under negation and permutations of indices. In the subsequent PR #13057, we show all normalized EDSs (`normEDS`), defined using the even-odd recursion (i)-(ii), are elliptic (i.e. satisfy the elliptic relations) divisibility sequences. This PR doesn't directly apply because a normEDS doesn't always satisfy the nonzerodivisor condition, but they are specializations of the universal normEDS, which does satisfy the condition. The technique of reducing to the universal case will be applied many times, and relies on the naturality (`map`) lemmas. We also change the `ℕ` in the definition `IsDivSequence` to `ℤ` which is more natural given that W is a `ℤ`-indexed sequence. --- - [x] depends on: #13153 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory merge-conflict awaiting-author label:t-algebra$	565/12	Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	1	55	['Multramate', 'alreadydone', 'github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	286-35763 9 months ago	286-35763 9 months ago	26-39367 26 days
15600	adomani author:adomani	feat: lint also `let` vs `have`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict WIP	77/26	Mathlib/Tactic/Linter/HaveLetLinter.lean,test/HaveLetLinter.lean	2	1	['github-actions']	nobody	285-4039 9 months ago	285-4039 9 months ago	0-8 8 seconds
13970	adomani author:adomani	feat: a linter to flag unnecessary uses of `nolint simpNF`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict awaiting-author	230/0	Mathlib.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/CategoryTheory/Comma/Arrow.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Even.lean,Mathlib/LinearAlgebra/CliffordAlgebra/EvenEquiv.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/UnnecessarySyntax.lean,test/UnnecessarySyntax.lean	13	4	['adomani', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	283-27253 9 months ago	283-27254 9 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	283-27126 9 months ago	283-27126 9 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	283-26241 9 months ago	283-26241 9 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	280-36421 9 months ago	280-36421 9 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	279-19755 9 months ago	279-19755 9 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	279-19755 9 months ago	279-19755 9 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	274-14499 9 months ago	274-14502 9 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	273-61036 9 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	273-42096 9 months ago	273-42096 9 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	272-39392 8 months ago	272-39392 8 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	271-54928 8 months ago	271-54928 8 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	271-24622 8 months ago	271-24622 8 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	268-25743 8 months ago	268-25743 8 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	267-83861 8 months ago	267-83861 8 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	267-64161 8 months ago	267-64161 8 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	266-54938 8 months ago	266-76913 8 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	266-54680 8 months ago	266-54680 8 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	265-34715 8 months ago	265-34715 8 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	263-23324 8 months ago	263-23324 8 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	263-21213 8 months ago	263-52478 8 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	262-46978 8 months ago	262-46978 8 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	262-8623 8 months ago	262-8623 8 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	260-72689 8 months ago	unknown	unknown
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	258-45610 8 months ago	258-45611 8 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	258-45486 8 months ago	258-45486 8 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	258-5961 8 months ago	258-5961 8 months ago	0-0 0 seconds
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	254-8397 8 months ago	254-8399 8 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	254-4303 8 months ago	254-4303 8 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	253-56034 8 months ago	253-56034 8 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	252-62363 8 months ago	252-62363 8 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	252-60370 8 months ago	252-60370 8 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	252-57406 8 months ago	252-57406 8 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	250-1939 8 months ago	250-1939 8 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	250-1939 8 months ago	250-1940 8 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	250-1938 8 months ago	250-1938 8 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	246-33959 8 months ago	248-57435 8 months ago	20-15089 20 days
11500	mcdoll author:mcdoll	refactor(Topology/Algebra/Module/WeakDual): Clean up	- Move `Dual` and `dualPairing` lower in the import-hierachy - deduplicate `dualPairing` - Bundle continuity statements to `CLM`s. - Make `WeakDual` and `WeakSpace` reducible - Remove `refine'` in favor of `refine` --- Cleaning up `Analysis/NormedSpace/WeakDual` will be done in a second PR [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict awaiting-author	227/179	Mathlib.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/NormedSpace/Dual.lean,Mathlib/Analysis/NormedSpace/WeakDual.lean,Mathlib/Analysis/VonNeumannAlgebra/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/Dual.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,docs/overview.yaml,docs/undergrad.yaml	15	14	['ADedecker', 'grunweg', 'j-loreaux', 'kkytola', 'mathlib-bors', 'mcdoll']	nobody	244-55902 8 months ago	244-55902 8 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	243-16148 8 months ago	243-16148 8 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	243-12137 8 months ago	243-12137 8 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	242-86211 7 months ago	335-23470 11 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	241-22293 7 months ago	241-22293 7 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	240-83370 7 months ago	240-83370 7 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	240-48489 7 months ago	325-20233 10 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	238-23288 7 months ago	238-23288 7 months ago	51-84473 51 days
16348	urkud author:urkud	refactor(Topology): require `LinearOrder` with `OrderTopology`	While the definition formally makes sense for a preorder, this topology is usually not the right one for a non-linear order (e.g., `Real × Real`). See [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Open.20Ioi) --- This PR doesn't cleanup any API, I'm going to do it in a later PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-topology merge-conflict awaiting-author	33/46	Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Topology/Algebra/Order/LiminfLimsup.lean,Mathlib/Topology/Instances/Sign.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Order/Filter.lean,Mathlib/Topology/Order/MonotoneContinuity.lean	6	10	['YaelDillies', 'github-actions', 'jcommelin', 'urkud']	nobody	238-22912 7 months ago	238-22912 7 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	238-19669 7 months ago	238-19669 7 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	236-60080 7 months ago	236-60080 7 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	235-82994 7 months ago	244-83468 8 months ago *	244-83445 244 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	234-45352 7 months ago	234-45352 7 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	232-24596 7 months ago	232-24596 7 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	230-21137 7 months ago	230-21137 7 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	228-79119 7 months ago	228-79119 7 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	227-83865 7 months ago	227-83865 7 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	227-41611 7 months ago	227-41611 7 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	227-14142 7 months ago	227-14142 7 months ago	0-0 0 seconds
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	223-31389 7 months ago	223-31389 7 months ago	0-0 0 seconds
9605	davikrehalt author:davikrehalt	feat(Data/Finset & List): Add Lemmas for Sorting and Filtering	This PR includes several useful lemmas to the Data/Finset and Data/List modules in Lean's mathlib: 1. `toFinset_filter` (List): Shows that filtering commutes with toFinset. 2. `toFinset_is_singleton_implies_replicate` (List): Shows a list with a singleton toFinset is a List.replicate. 3. `filter_sort_commute` (Finset): Sorting and filtering can be interchanged in Finsets. 4. `Sorted.filter` (List): A sorted list stays sorted after filtering. 5. `Sorted.append_largest` (List): Appending the largest element keeps a list sorted. 6. `sort_monotone_map` (Finset): Relates sorting of a Finset after mapping to sorting of a list. 7. `sort_insert_largest` (Finset): Sorting a Finset with an inserted largest element. 8. `sort_range` (Finset): Sorting a range in a Finset equals the corresponding range list. 9. ~~`filter_eval_true` (List): Filtering a list with a predicate always true keeps the list unchanged.~~ 10. ~~`filter_eval_false` (List): Filtering with an always-false predicate gives an empty list.~~ 11. ~~`pairwise_concat` (List): Iff condition for Pairwise relation in concatenated lists (similar to pairwise_join).~~ 12. `list_map_toFinset` (Finset): toFinset commutes with map under injection --- - [x] depends on: #15952 This is my first PR to mathlib, so I'm not too familiar with etiquette's and more specifically there are two proofs in the PR which uses aesop, and I am not sure if it's frowned upon. I kept the aesop in there for now as I couldn't construct very short proofs otherwise. The sort_range function proof was suggested in https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Computing.20Finset.20sort.20of.20Finset.20range/near/410346731 by Ruben Van de Velde. Thanks for your time for improving this PR.	t-data new-contributor merge-conflict please-adopt awaiting-author	71/0	Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Sort.lean	4	30	['YaelDillies', 'davikrehalt', 'eric-wieser', 'github-actions', 'jcommelin', 'leanprover-community-mathlib4-bot', 'urkud', 'vihdzp']	YaelDillies assignee:YaelDillies	221-82306 7 months ago	248-51097 8 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	219-35924 7 months ago	219-35924 7 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	219-8657 7 months ago	244-83579 8 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	217-68963 7 months ago	217-68963 7 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	217-68717 7 months ago	217-68717 7 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	217-47274 7 months ago	217-47274 7 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	217-23736 7 months ago	217-23736 7 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	217-16568 7 months ago	217-16568 7 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	216-81471 7 months ago	216-81471 7 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	216-72225 7 months ago	216-72239 7 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	216-21284 7 months ago	335-23470 11 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	215-52872 7 months ago	215-52872 7 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	215-51775 7 months ago	215-51775 7 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	214-40143 7 months ago	214-40143 7 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	213-8993 7 months ago	213-8993 7 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	213-8624 7 months ago	213-8624 7 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	212-34045 7 months ago	212-34045 7 months ago	0-1869 31 minutes
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	209-60816 6 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	209-32087 6 months ago	209-32087 6 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	208-83747 6 months ago	208-83748 6 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	208-47825 6 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	208-22958 6 months ago	208-22958 6 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	208-22545 6 months ago	208-22545 6 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	207-32218 6 months ago	207-32218 6 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	207-9419 6 months ago	208-78227 6 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	206-41972 6 months ago	206-41972 6 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	206-41210 6 months ago	206-41210 6 months ago	1-49655 1 day
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	206-24388 6 months ago	207-71731 6 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	205-83871 6 months ago	205-83871 6 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	205-66745 6 months ago	212-8270 7 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	205-40906 6 months ago	205-40906 6 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	203-22664 6 months ago	203-22664 6 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	203-18192 6 months ago	496-40665 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	203-9053 6 months ago	203-9053 6 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	202-86235 6 months ago	202-86235 6 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	202-4846 6 months ago	202-4846 6 months ago	10-33091 10 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	201-28188 6 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	201-28188 6 months ago	201-28188 6 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	199-51840 6 months ago	199-51840 6 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	198-74342 6 months ago	198-74342 6 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	198-47582 6 months ago	198-47582 6 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	197-65360 6 months ago	197-65360 6 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	196-38467 6 months ago	196-38467 6 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	196-30997 6 months ago	196-30997 6 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	196-24382 6 months ago	196-24382 6 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	196-24381 6 months ago	196-24381 6 months ago	0-380 6 minutes
19212	Julian author:Julian	feat(LinearAlgebra): add a variable_alias for VectorSpace	Taken directly from the variable_alias docs. Zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/why.20.5Bvariable_alias.5D.20attribute.20is.20not.20used.20in.20Mathlib.3F --- This is the first actual variable alias added to mathlib. I haven't reviewed variable_alias fully, but it seems like there's at least 3 ways they could be distributed in Mathlib: * alongside whatever subfolder they "belong to" (which is what I've tentatively done here) * In a file called `Aliases` somewhere near the thing they alias (which seems less discoverable to me) * In a single file, a la `Mathlib.TrainingWheels` (with some less playful name) which is meant to define a bunch of more "friendly" aliases all in one place. I kind of like the idea of the third thing as a future module but perhaps it can be synthesized if/when there are more aliases? For now as I say I've done the first one, but please let me know if someone prefers something else. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	195-29627 6 months ago	195-29627 6 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	193-5704 6 months ago	193-5704 6 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	192-12845 6 months ago	280-1926 9 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	192-12391 6 months ago	248-56517 8 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	191-79007 6 months ago	191-79007 6 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	190-32330 6 months ago	190-32330 6 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	189-61105 6 months ago	189-61105 6 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	189-61104 6 months ago	189-61104 6 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	189-40518 6 months ago	189-40518 6 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	189-33051 6 months ago	298-32241 9 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	186-70624 6 months ago	186-84951 6 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	186-36709 6 months ago	186-36709 6 months ago	64-29952 64 days
19097	Vierkantor author:Vierkantor	chore(Algebra.Polynomial): split `Polynomial/Basic.lean` into smaller files	This PR splits `Mathlib.Algebra.Polynomial.Basic` into the following files: * `Polynomial/Defs.lean`: definition and ring structure on `R[X]` * `Polynomial/Module.lean`: module structure on `R[X]` * `Polynomial/Monomial.lean`: merged definition of `monomial`, `X`, `C` into the existing file (this is probably the file you want to import from now on) * `Polynomial/EraseUpdate.lean`: definition of `erase` and `update` * `Polynomial/Sum.lean`: definition of `sum` Initially I added the monomial results to a new file, but ended up merging it with `Monomial.lean` since the two of them merge cleanly. --- - [ ] 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	181-70207 5 months ago	191-3681 6 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	181-57773 5 months ago	181-57773 5 months ago	31-75259 31 days
17071	ScottCarnahan author:ScottCarnahan	feat : (LinearAlgebra/RootSystem) : Separation, base, cartanMatrix	This PR defines an abstract separation structure for roots, together with the associated base and Cartan Matrix. In general, the good properties will follow from additional order hypotheses on the base ring (implemented in a future PR). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	111/0	Mathlib.lean,Mathlib/LinearAlgebra/RootSystem/Separation.lean	2	1	['github-actions']	nobody	181-47674 5 months ago	181-47674 5 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	181-26550 5 months ago	191-3680 6 months ago	0-0 0 seconds
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	179-12759 5 months ago	270-30736 8 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	178-70242 5 months ago	185-19265 6 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	178-19257 5 months ago	178-19258 5 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	177-31168 5 months ago	177-31168 5 months ago	3-30853 3 days
18748	FR-vdash-bot author:FR-vdash-bot	refactor: deprecate `ContinuousLinearMapClass`	--- - [ ] depends on: #18689 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	115/49	Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,Mathlib/Topology/Homeomorph.lean	10	5	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	175-21786 5 months ago	175-21789 5 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	172-33581 5 months ago	551-82758 1 year ago	0-0 0 seconds
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	171-40988 5 months ago	171-40988 5 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	171-40987 5 months ago	171-40987 5 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	171-23248 5 months ago	171-23248 5 months ago	0-666 11 minutes
18262	joelriou author:joelriou	feat(Algebra/Category/ModuleCat/Presheaf): exterior powers of presheaves of modules	--- - [x] depends on: #18261 - [ ] depends on: #18236 - [ ] depends on: #18197 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-category-theory merge-conflict blocked-by-other-PR WIP label:t-algebra$	874/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/ExteriorPower.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/ExteriorPower.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/FunctorOfNatTrans.lean,Mathlib/Algebra/Category/ModuleCat/Pseudofunctor.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	171-14543 5 months ago	206-81008 6 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	166-22180 5 months ago	166-22181 5 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	164-27614 5 months ago	164-27614 5 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	161-22673 5 months ago	206-38301 6 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	157-81877 5 months ago	157-81877 5 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	157-81754 5 months ago	157-81754 5 months ago	66-24436 66 days
3251	kmill author:kmill	feat: deriving `LinearOrder` for simple enough inductive types	Uses the same machinery underlying the `Fintype` derive handler to derive a lexicographical `LinearOrder` for non-recursive inductive types that have no indices. In principle more complicated types can have `LinearOrder`s, but that would require a more sophisticated implementation. --- - [x] depends on: #3198 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author WIP	82/0	Mathlib.lean,Mathlib/Tactic/DeriveLinearOrder.lean	2	5	['ChrisHughes24', 'kim-em', 'kmill', 'vihdzp']	nobody	155-56407 5 months ago	155-56407 5 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	155-56406 5 months ago	155-56406 5 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	153-73947 5 months ago	153-73947 5 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	153-41236 5 months ago	153-41237 5 months ago	0-8789 2 hours
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	149-9894 4 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	147-22352 4 months ago	194-30489 6 months ago	0-200 3 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	147-18579 4 months ago	147-18579 4 months ago	6-66637 6 days
17739	Aaron1011 author:Aaron1011	feat(Topology/Order/DenselyOrdered): prove Not (IsOpen) for intervals	Prove that Iic/Ici/Ioc/Ico/Icc intervals are not open in densely ordered topologies with no min/max element --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology merge-conflict awaiting-author	27/0	Mathlib/Topology/Order/DenselyOrdered.lean	1	8	['github-actions', 'vihdzp']	nobody	145-5854 4 months ago	145-5854 4 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	145-5609 4 months ago	145-5609 4 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	144-40543 4 months ago	144-40543 4 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	144-30378 4 months ago	144-30378 4 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	144-27126 4 months ago	144-27126 4 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	144-24940 4 months ago	144-24940 4 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	144-24940 4 months ago	144-24940 4 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	143-77259 4 months ago	143-77259 4 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	143-33231 4 months ago	143-33231 4 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	142-9442 4 months ago	298-33062 9 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	141-84513 4 months ago	141-84513 4 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	141-69109 4 months ago	141-69109 4 months ago	117-22351 117 days
19291	PieterCuijpers author:PieterCuijpers	feat(Algebra/Order/Hom): add quantale homomorphism	Definition of quantale homomorphisms as functions that are both semigroup homomorphisms and complete lattice homomorphisms. --- - [x] depends on: #19810 - [x] depends on: #19811 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict awaiting-author label:t-algebra$	209/0	Mathlib.lean,Mathlib/Algebra/Order/Hom/Quantale.lean,scripts/noshake.json	3	29	['PieterCuijpers', 'YaelDillies', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot']	nobody	139-12518 4 months ago	139-12519 4 months ago	36-2255 36 days
19352	hrmacbeth author:hrmacbeth	chore: change some `nlinarith`s to `linear_combination`s	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	13/13	Archive/Imo/Imo2021Q1.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Increment.lean,Mathlib/NumberTheory/Modular.lean	8	4	['github-actions', 'hrmacbeth', 'leanprover-bot']	nobody	137-41729 4 months ago	137-41729 4 months ago	0-8636 2 hours
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	135-34899 4 months ago	135-34899 4 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	133-18703 4 months ago	133-18703 4 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	132-29866 4 months ago	132-29866 4 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	131-4299 4 months ago	131-4299 4 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	130-84729 4 months ago	130-84729 4 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	130-20459 4 months ago	564-80146 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	130-20444 4 months ago	678-28652 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	129-84364 4 months ago	129-84364 4 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	129-84241 4 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	129-83870 4 months ago	129-83870 4 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	129-30189 4 months ago	129-30189 4 months ago	0-79429 22 hours
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	129-822 4 months ago	129-822 4 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	128-69017 4 months ago	130-82116 4 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	128-37457 4 months ago	128-37457 4 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	125-44790 4 months ago	125-44790 4 months ago	0-201 3 minutes
9449	hmonroe author:hmonroe	feat: Add Turing machine with the quintet definition (TMQ) and a chainable step function for each TM type	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability merge-conflict awaiting-author	458/1	Mathlib/Computability/TuringMachine.lean,Mathlib/Logic/PartArith.lean	2	8	['eric-wieser', 'github-actions', 'hmonroe']	nobody	124-49043 4 months ago	124-49043 4 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	123-23860 4 months ago	123-23860 4 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	122-16308 4 months ago	122-16308 4 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	122-10354 4 months ago	122-10354 4 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	122-5061 4 months ago	122-5061 4 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	121-4182 4 months ago	121-4182 4 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	120-66704 4 months ago	120-66704 4 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	119-73576 3 months ago	119-73576 3 months ago	39-21495 39 days
21610	JLimperg author:JLimperg	Aesop forward benchmark: forward precomp	Not a real PR, just for benchmarking.	merge-conflict	30/27	Mathlib/Data/List/InsertIdx.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	7	3	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	119-23067 3 months ago	120-11430 4 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	119-23066 3 months ago	120-11386 4 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	119-23065 3 months ago	120-11267 4 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	118-84993 3 months ago	118-84993 3 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	118-82478 3 months ago	118-82478 3 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	117-54823 3 months ago	117-54824 3 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	117-54578 3 months ago	117-54578 3 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	117-15103 3 months ago	117-15103 3 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	115-41727 3 months ago	115-41727 3 months ago	0-36287 10 hours
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	115-39352 3 months ago	115-39352 3 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	115-39351 3 months ago	115-39351 3 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	115-39350 3 months ago	115-39350 3 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	115-38253 3 months ago	115-38253 3 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	115-21522 3 months ago	115-21522 3 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	115-21275 3 months ago	115-21275 3 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	115-19510 3 months ago	115-19510 3 months ago	3-64280 3 days
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	114-12189 3 months ago	114-12189 3 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	113-12352 3 months ago	113-12352 3 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	112-82253 3 months ago	113-27024 3 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	112-54631 3 months ago	188-47813 6 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	112-19817 3 months ago	112-19817 3 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	112-19817 3 months ago	112-19817 3 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	112-19326 3 months ago	112-19326 3 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	112-5848 3 months ago	112-5848 3 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	110-54009 3 months ago	110-54009 3 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	110-54008 3 months ago	110-54008 3 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	110-24901 3 months ago	110-24902 3 months 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	109-64103 3 months ago	109-64103 3 months ago	45-6057 45 days
5062	adomani author:adomani	feat(Tactic/Prune + test/Prune): add `prune` tactic, for removing unnecessary hypotheses	This tactic removes very conservatively all local declarations that 1. do not appear in the main goal, 2. do not appear in a declaration that appears in the main goal, 3. ... and so on recursively. The main motivation for this tactic is that all available variables in the current `namespace/section` appear in the goal state, not just the ones that are needed for the statement to type-check. Using `prune` mitigates this situation. The tactic also admits an optional natural number argument: `prune n` removes all variables that have not appeared at the `(n+1)`-st stage in the above list. Thus, `prune 0` only leaves the variables needed for the statement to type-check. Also, for sufficiently large `n`, `prune n` is a synonym for `prune`. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/substitute.20for.20.60include.2Fomit.60.3F) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict modifies-tactic-syntax awaiting-author	181/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Prune.lean,test/Prune.lean	4	5	['adomani', 'j-loreaux', 'kmill']	nobody	109-31410 3 months ago	109-31410 3 months 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	109-13157 3 months ago	109-13158 3 months 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	108-17910 3 months ago	108-17910 3 months 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	107-83474 3 months ago	108-9128 3 months ago *	0-0 0 seconds *
21433	grunweg author:grunweg	chore: change more lemmas to be about enorm instead of nnnorm	--- - [x] depends on: #21782 - [x] depends on: #21783 (and this PR modifies the file split, and file splits are painful to merge over) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson t-measure-probability merge-conflict awaiting-author	172/71	Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/ContinuousFunctions.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean	9	18	['RemyDegenne', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib4-dependent-issues-bot']	nobody	107-82663 3 months ago	110-29747 3 months ago	2-42743 2 days
22171	JLimperg author:JLimperg	Aesop forward benchmark: forward no-precomp naive rpinf pr-release	Not a real PR, just for benchmarking.	merge-conflict	31/27	Mathlib/Data/List/InsertIdx.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	7	5	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	107-4947 3 months ago	108-8691 3 months ago *	0-0 0 seconds *
21099	chrisflav author:chrisflav	chore(RingTheory/Generators): use unification hints for variables and relations	When working with generators and presentations, we rely on the `MvPolynomial` API, but since the type of variables is bundled in `Generators R S`, many lemmas don't apply with `rw` or `simp`, because they can't see through the definition of `vars` in constructions such as `Generators.comp` and `Generators.localizationAway`. A possible approach is to make all of these constructions `abbrev`s, but this causes `simp` to also unfold `val` which is not always desirable. More generally, it is then harder to predict how instance search and `simp` behave. This approach is tried in #21050, but causes many regressions. This approach is less invasive, as it uses `unif_hint` to unify the `vars` (and `rels`) fields of constructions with the correct type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	231/91	Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/RingTheory/Generators.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/Presentation.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean	5	16	['chrisflav', 'erdOne', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	106-12844 3 months ago	106-12844 3 months ago	27-75210 27 days
21269	CharredLee author:CharredLee	(WIP) feat (CategoryTheory/Topos): Add topos theory content	This code contains basic definitions and results in topos theory, including the definition of a subobject classifier, power objects, and topoi. It is proved that every topos has exponential objects, i.e. "internal homs". The mathematical content follows chapter IV sections 1-2 of Mac Lane and Moerdijk's text "Sheaves in Geometry and Logic". --- - [x] depends on: #21281 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory merge-conflict awaiting-author WIP	1269/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Basic.lean,Mathlib/CategoryTheory/Topos/Classifier.lean,Mathlib/CategoryTheory/Topos/Exponentials.lean,Mathlib/CategoryTheory/Topos/Power.lean	5	10	['CharredLee', 'gio256', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	104-73947 3 months ago	104-73947 3 months ago	0-13879 3 hours
12394	JADekker author:JADekker	feat : define pre-tight and tight measures	Define tight measures (by first defining separable and pre-tight measures). Define some api for all three concepts Prove Ulam's tightness theorem and a strengthened version of this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict please-adopt awaiting-author	503/0	Mathlib.lean,Mathlib/MeasureTheory/Measure/Tight.lean	2	34	['EtienneC30', 'JADekker', 'github-actions', 'sgouezel']	nobody	104-16440 3 months ago	104-16440 3 months 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	103-83762 3 months ago	103-85035 3 months 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	103-42843 3 months ago	103-42843 3 months 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	103-39674 3 months ago	103-39677 3 months 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	103-17576 3 months ago	120-11640 4 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	103-15940 3 months ago	120-11504 4 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	102-81711 3 months ago	102-81712 3 months ago	0-61590 17 hours
13686	fpvandoorn author:fpvandoorn	feat: some finset lemmas	* From the Sobolev inequality project * The increase in imports in `Mathlib.Data.Finset.Update` is not problematic: it is only imported in MeasureTheory files. Co-authored-by: Heather Macbeth 25316162+hrmacbeth@users.noreply.github.com --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict awaiting-author	69/7	Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Lattice/Lemmas.lean,Mathlib/Data/Finset/Update.lean	3	7	['YaelDillies', 'fpvandoorn', 'github-actions', 'urkud']	nobody	101-81342 3 months ago	101-81342 3 months ago	98-49006 98 days
14313	grhkm21 author:grhkm21	feat(RepresentationTheory/FdRep): FdRep is a full subcategory of Rep	``` /-- Equivalence between `FDRep` and the full subcategory of finite dimensional `Rep`. -/ def equivFiniteDimensional : FDRep k G ≌ FullSubcategory (fun V : Rep k G ↦ FiniteDimensional k V) ```	new-contributor t-algebra t-category-theory merge-conflict label:t-algebra$	47/8	Mathlib/RepresentationTheory/FDRep.lean	1	19	['github-actions', 'grhkm21', 'joelriou', 'kim-em', 'mathlib-bors']	nobody	101-29873 3 months ago	101-29873 3 months ago	125-12755 125 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	100-21658 3 months ago	100-21658 3 months 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	100-21657 3 months ago	100-21657 3 months 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	100-14184 3 months ago	100-14184 3 months ago	15-40648 15 days
10823	alexkeizer author:alexkeizer	feat: convert curried type functions into uncurried type functions	Adds a conversion `TypeFun.ofCurried : CurriedTypeFun.{u, v} n -> TypeFun.{u, v} n`, where `CurriedTypeFun.{u,v} n` is a (def-eq) abbreviation for `Type u -> ... -> Type u -> Type v`, i.e., the type of curried functions taking `n` arguments of type `Type u` to return an element of `Type v`, and `TypeFun.{u, v} n` is an abbreviation for `TypeVec.{u} n -> Type v`. It is generally more idiomatic to define type functions with multiple arguments in the curried style, but in the QPF development we use the uncurried equivalent `TypeVec n -> Type _`. Thus, having a canonical conversion from curried functions to uncurried gives us a canonical way to ask if a curried type function, say `Sum` is a QPF (namely, "is there an instance of `MvQPF (TypeFun.ofCurried Sum)`"). --- This is code ported from https://github.com/alexkeizer/QpfTypes, where this conversion is crucial in presenting a high-level interface, in terms of idiomatic, curried, type functions to users, while being built on QPFs (and thus, uncurried typefunctions) underneath. There is also a conversion in the other direction, from uncurried to curried, which I've decided to PR later, to keep this PR smaller and hopefully easier to review. - [x] depends on: #10818 (all changes to `Fin2.lean` are part of 10818, not the current PR) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict awaiting-author	66/0	Mathlib.lean,Mathlib/Data/TypeFun.lean	2	9	['YaelDillies', 'alexkeizer', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	100-7904 3 months ago	unknown	unknown
13648	urkud author:urkud	feat(Topology/Module): generalize `ContinuousLinearMap.compSL`	Generalize `ContinuousLinearMap.compSL` to topological vector spaces. --- - [ ] depends on: #15217 This PR is not polished yet, but the main statement is there. @ADedecker This answers a question I asked you on Zulip a few months ago. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis t-topology merge-conflict awaiting-author label:t-algebra$	23/18	Mathlib/Analysis/NormedSpace/OperatorNorm/Bilinear.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean	2	5	['fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	98-30994 3 months ago	98-30994 3 months 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	98-30494 3 months ago	98-30494 3 months ago	0-0 0 seconds
21684	mattrobball author:mattrobball	draft		merge-conflict	13/11	Mathlib/CategoryTheory/Category/Cat/AsSmall.lean,Mathlib/CategoryTheory/Closed/FunctorToTypes.lean,Mathlib/CategoryTheory/Closed/Types.lean,Mathlib/FieldTheory/IsAlgClosed/Classification.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/Topology/Category/LightProfinite/Basic.lean,lean-toolchain	7	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	98-24564 3 months ago	98-24564 3 months ago	0-0 0 seconds
21722	mattrobball author:mattrobball	test		merge-conflict	76/23	Mathlib/CategoryTheory/Category/Cat/AsSmall.lean,Mathlib/CategoryTheory/Closed/FunctorToTypes.lean,Mathlib/CategoryTheory/Closed/Types.lean,Mathlib/FieldTheory/IsAlgClosed/Classification.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/Topology/Category/LightProfinite/Basic.lean,lean-toolchain,scratch.lean	9	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	98-24563 3 months ago	98-24563 3 months ago	0-0 0 seconds
22408	JLimperg author:JLimperg	Aesop forward bench: precomp only rpinf	--- Not a real PR (yet), just for benchmarking. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	dependency-bump merge-conflict	5/3	lake-manifest.json,lakefile.lean,scripts/bench/fake-root/lib/lean/libleanshared.so,scripts/bench/run	4	6	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	98-19398 3 months ago	98-19398 3 months 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	98-15949 3 months ago	225-32457 7 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	98-11736 3 months ago	98-11736 3 months 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	98-5719 3 months ago	98-5719 3 months 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	97-58697 3 months ago	97-58697 3 months 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	97-58451 3 months ago	97-58451 3 months 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	97-58451 3 months ago	97-58451 3 months 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	97-58450 3 months ago	97-58450 3 months 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	97-58204 3 months ago	97-58204 3 months 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	96-19545 3 months ago	96-19545 3 months 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	96-15887 3 months ago	96-15887 3 months 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	96-11182 3 months ago	96-11182 3 months 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	94-34141 3 months ago	94-34141 3 months 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	94-17900 3 months ago	94-17900 3 months ago	0-0 0 seconds
20750	adomani author:adomani	feat: the envLinter syntax linter	The `envLinter` syntax linter emits a warning at the end of a file if `#lint` reports an error. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict	69/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/EnvLinter.lean,MathlibTest/EnvLinter.lean	5	15	['adomani', 'github-actions', 'grunweg']	nobody	94-17654 3 months ago	94-17654 3 months ago	51-71438 51 days
22359	adomani author:adomani	feat(whitespace): do not allow indented doc-strings	In a doc-string, Do not allow the first character after the first line break to be a space. --- There are approximately 2.5k exceptions. I think that they should be unindented, judging from the sample that I looked at, but won't act on it, unless there is a clear plan to fix and merge this modification! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict WIP	222/70	Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Mathlib.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/Analysis/Asymptotics/ExpGrowth.lean,Mathlib/Data/Matroid/Circuit.lean,Mathlib/Init.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Encode.lean,Mathlib/LinearAlgebra/Dimension/StrongRankCondition.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/DocString.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/UnitInterval.lean,MathlibTest/LintDocstring.lean,lakefile.lean	20	1	['github-actions']	nobody	94-16819 3 months ago	94-16819 3 months 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	92-1122 3 months ago	147-30236 4 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	91-73714 2 months ago	91-73714 2 months ago	130-5197 130 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	90-80019 2 months ago	90-80019 2 months 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	90-66590 2 months ago	90-66590 2 months ago	1-84890 1 day
17368	Felix-Weilacher author:Felix-Weilacher	feat(Topology/Baire/BaireMeasurable): add the Kuratowski-Ulam theorem	Add the Kuratowski-Ulam theorem, which one can think of as a "Fubini" for Baire category. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	187/1	Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Topology/Baire/BaireMeasurable.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/GDelta/Basic.lean	5	6	['Felix-Weilacher', 'github-actions', 'urkud']	nobody	90-11383 2 months ago	90-11383 2 months ago	72-13986 72 days
8767	eric-wieser author:eric-wieser	refactor(Cache): tidy lake-manifest parsing in Cache	This now respects local copies of Mathlib dependencies (though in practice these invalidate the online cache because to point to local copies of Mathlib, the hash for `lakefile.lean` and `lake-manifest.json` is first invalidated). --- - [x] depends on: #11492 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	49/49	Cache/Hashing.lean,Cache/IO.lean,lake-manifest.json	3	8	['digama0', 'eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	88-73446 2 months ago	270-39396 8 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	88-16485 2 months ago	88-16485 2 months ago	1-79072 1 day
15578	znssong author:znssong	feat(Function): Fixed points of function `f` with `f(x) >= x`	We added some lemmas of fixed points of function `f` with `f(x) >= x`, where `f : α → α` is a function on a finite type `α`. This will be needed in proof of Bondy-Chvátal theorem. --- See also branch `meow-sister/BondyChvatal`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict awaiting-author	82/0	Mathlib.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Increasing.lean	3	32	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'urkud', 'vihdzp', 'znssong']	nobody	88-11713 2 months ago	88-11713 2 months 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	87-57302 2 months ago	87-57303 2 months ago	0-0 0 seconds
22517	j-loreaux author:j-loreaux	feat: `ℕ+` powers in semigroups	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict WIP	275/28	Mathlib.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/PNatPowAssoc.lean,Mathlib/Algebra/Group/PPow.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/ULift.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/ZMod/Defs.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/Tactic/ToAdditive/Frontend.lean	14	4	['github-actions', 'j-loreaux', 'leanprover-bot']	nobody	87-46309 2 months ago	87-46310 2 months ago	0-27 27 seconds
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	86-22425 2 months ago	86-22425 2 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	84-38142 2 months ago	84-38142 2 months 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	84-16605 2 months ago	118-83953 3 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	84-13221 2 months ago	100-22411 3 months 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	83-70176 2 months ago	83-70176 2 months 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	83-31960 2 months ago	83-31960 2 months 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	83-31489 2 months ago	83-31489 2 months 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	83-29500 2 months ago	83-29500 2 months 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	83-29376 2 months ago	83-29376 2 months 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	82-75782 2 months ago	82-75784 2 months ago	0-0 0 seconds
19013	quangvdao author:quangvdao	feat(Algebra/BigOperators/Fin): Add `finSigmaFinEquiv`	This PR adds `finSigmaFinEquiv` which is the equivalence `(i : Fin m) × Fin (n i) ≃ Fin (∑ i, n i)`. This is the dependent version of `finProdFinEquiv`. CI should be passing, but there are two things I'd like feedback on: 1. When defining the mappings, I have to consider `m = 0` separately. Is there a more uniform definition? 2. I'm proving this as a step toward defining `Fin.join`, which is the analogue of `List.join`. I can now technically define `Fin.join` as: ``` variable {a : Fin n → ℕ} {α : (i : Fin n) → (j : Fin (a i)) → Sort*} def join (v : (i : Fin n) → (j : Fin (a i)) → α i j) (k : Fin (∑ i, a i)) : α (finSigmaFinEquiv.invFun k).1 (finSigmaFinEquiv.invFun k).2 := v (finSigmaFinEquiv.invFun k).1 (finSigmaFinEquiv.invFun k).2 ``` but this looks horrible. This highly motivates refactoring `invFun` as two new definitions: ``` def func1 {n : ℕ} (a : Fin n → ℕ) (k : Fin (∑ i, a i)) : Fin n := sorry def func2 {n : ℕ} (a : Fin n → ℕ) (k : Fin (∑ i, a i)) : Fin (a (func1 a k)) := sorry ``` I'm not sure what to call these functions. The analogues in the non-dependent case are `divNat` and `modNat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	92/16	Mathlib/Algebra/BigOperators/Fin.lean	1	14	['YaelDillies', 'eric-wieser', 'github-actions', 'quangvdao']	nobody	82-5809 2 months ago	82-5809 2 months 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	81-53622 2 months ago	81-53622 2 months 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	81-53498 2 months ago	81-53498 2 months ago	28-73677 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	80-80757 2 months ago	80-80757 2 months 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	80-62087 2 months ago	80-62087 2 months 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	80-61842 2 months ago	80-61842 2 months ago	47-37012 47 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	80-6600 2 months ago	80-6600 2 months 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	79-24845 2 months ago	79-24846 2 months ago	22-71271 22 days
20874	grunweg author:grunweg	chore(nolint.yml): use shallow clones	This should be sufficient, and be slightly faster on CI. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict awaiting-author	0/3	.github/workflows/nolints.yml	1	2	['bryangingechen', 'github-actions']	nobody	79-24600 2 months ago	79-24600 2 months ago	0-15573 4 hours
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	77-11875 2 months ago	77-11875 2 months ago	0-1459 24 minutes
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	76-27451 2 months ago	91-7907 2 months ago	0-0 0 seconds
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	74-68777 2 months ago	74-68777 2 months ago	0-6819 1 hour
18284	chrisflav author:chrisflav	feat(AlgebraicGeometry): relative gluing of schemes	We show https://stacks.math.columbia.edu/tag/01LH using #14208. This shall be used to construct the relative spectrum of a quasi-coherent algebra. --- - [ ] depends on: #14208 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict WIP	1393/7	Mathlib.lean,Mathlib/AlgebraicGeometry/Gluing.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/RelativeGluing.lean,Mathlib/AlgebraicGeometry/Sites/Representability.lean,Mathlib/CategoryTheory/Functor/FullyFaithful.lean,Mathlib/CategoryTheory/Limits/Shapes/Types.lean,Mathlib/CategoryTheory/MorphismProperty/Representable.lean	8	n/a	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	74-5129 2 months ago	unknown	unknown
16810	urkud author:urkud	feat: define `(a : ENat) ^ (b : ENat)`	The definition agrees with `Cardinal.toENat`, i.e., `#(α → β) = #β ^ #α`, where `#` is the not-yet-defined `ENat.card α = Cardinal.toENat (Cardinal.mk α)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-data merge-conflict	51/0	Mathlib.lean,Mathlib/Data/ENat/Pow.lean	2	1	['github-actions']	nobody	73-47970 2 months ago	73-47970 2 months ago	0-0 0 seconds
16009	Command-Master author:Command-Master	acyclic graph	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict WIP	232/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	1	['github-actions']	nobody	73-16926 2 months ago	73-16926 2 months ago	0-0 0 seconds
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	70-76416 2 months ago	70-76416 2 months ago	0-1344 22 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	70-67743 2 months ago	70-67743 2 months 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	70-39045 2 months ago	70-39045 2 months 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	70-25746 2 months ago	unknown	unknown
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	69-59586 2 months ago	69-59586 2 months 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	69-57349 2 months ago	69-57349 2 months ago	14-35834 14 days
21018	markimunro author:markimunro	feat(Data/Matrix): add file with key definitions and theorems about elementary row operations	Prove that each elementary row operation is equivalent to a multiplication by an elementary matrix, has another row operation which inverts it, and that each elementary matrix has a left inverse. This is a very large PR and I understand it will take time. This is my first one and will likely have issues but I will be ready to answer questions/fix them as soon as possible. Co-authored-by: Christopher Lynch --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict awaiting-author enhancement	1230/0	Mathlib.lean,Mathlib/Data/Matrix/ElementaryRowOperations.lean,Mathlib/Data/Matrix/GaussianElimination.lean,Mathlib/Data/Matrix/GaussianEliminationOld,Mathlib/Data/Matrix/oldnames,et --hard 18533caba32,lean-toolchain	7	n/a	['chrisflav', 'eric-wieser', 'github-actions', 'j-loreaux', 'markimunro']	nobody	69-47112 2 months ago	unknown	unknown
23514	eric-wieser author:eric-wieser	refactor: smooth over Lattice/LinearOrder inheritance	This fixes the forgetful inheritance in `CompleteLinearOrder` and `ConditionallyCompleteLinearOrder`, which previously did not carry `compare` fields. (edit: moved to #23515) The following is the inheritance diagram before, where the dotted lines are manual instances. Note that every lattice typeclass that extends `LinearOrder` has to implement another dotted line edge, and remember to copy all the necessary data fields. ```mermaid graph TD LinearOrder --> Min,Max; LinearOrder --> PartialOrder; Lattice --> PartialOrder; CompleteLinearOrder --> Lattice; ConditionallyCompleteLinearOrder --> Lattice; LinearOrder-.-> Lattice; CompleteLinearOrder -.-> LinearOrder; ConditionallyCompleteLinearOrder -.-> LinearOrder; ``` This change introduces two new auxiliary typeclasses, to encapsulate these troublesome edges. `LinearOrderedLattice` can be thought of as `LinearOrder`, but with `sup`/`inf` instead of `min`/`max`. This is crucial, because it ensures the duplicate fields are merged in `extends CompleteLattice X, LinearOrderedLattice X`, which would not be the case for `extends CompleteLattice X, LinearOrder X`. The result is: ```mermaid graph TD LinearOrder --> Min,Max; LinearOrder --> LinearOrderBase; LinearOrderBase --> PartialOrder; Lattice --> PartialOrder; LinearOrderedLattice -.-> LinearOrder; LinearOrderedLattice --> LinearOrderBase; LinearOrderedLattice --> Lattice; CompleteLinearOrder --> LinearOrderedLattice; ConditionallyCompleteLinearOrder --> LinearOrderedLattice; ``` --- - [ ] depends on: #23515 - [ ] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	85/66	Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Order/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Lattice.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	68-72942 2 months ago	68-72942 2 months ago	0-3019 50 minutes
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	68-33315 2 months ago	68-33315 2 months 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	68-30348 2 months ago	126-13301 4 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	68-28146 2 months 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	68-23004 2 months ago	68-23032 2 months ago	0-84180 23 hours
13124	FR-vdash-bot author:FR-vdash-bot	chore: remove `CovariantClass` and `ContravariantClass`	Lean cannot handle `CovariantClass` and `ContravariantClass` correctly - TC slowness - [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/TC.20slowness) - https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1691792488 - It may also have made #6326 fail. - Needs a weird hack to find instance: #9252 --- - [x] depends on: #13154 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	602/486	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/Group/Subgroup/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Algebra/Order/Group/Action.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/Units.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Ring/Subring/Pointwise.lean,Mathlib/Algebra/Ring/Subsemiring/Pointwise.lean,Mathlib/Analysis/SumOverResidueClass.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/Order/Filter/IsBounded.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/RingTheory/Ideal/Pointwise.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/Order/LiminfLimsup.lean	37	6	['FR-vdash-bot', 'MichaelStollBayreuth', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	67-50981 2 months ago	67-50981 2 months 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	67-14983 2 months ago	77-18908 2 months 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	67-1808 2 months ago	67-1808 2 months 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	66-56135 2 months ago	66-56136 2 months ago	0-73190 20 hours
19275	eric-wieser author:eric-wieser	fix: if nolint files change, do a full rebuild	Otherwise CI will succeed when removing entries from the file, but fail later when someone changes something unrelated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict delegated	8/0	lakefile.lean	1	20	['YaelDillies', 'adomani', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	66-20303 2 months ago	66-20303 2 months 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	66-13166 2 months ago	66-13166 2 months 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	66-6724 2 months 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	64-83010 2 months ago	64-83012 2 months ago	5-54179 5 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	64-82421 2 months ago	64-82421 2 months 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	64-82294 2 months ago	67-49254 2 months ago	43-68322 43 days
15212	victorliu5296 author:victorliu5296	feat: Add fundamental theorem of calculus-2 for Banach spaces	add the Mean Value Theorem for Banach spaces to the library and include reference for the theorem statement This theorem states that if `f : X → Y` is differentiable along the line segment from `a` to `b`, then the change in `f` equals the integral of its derivative along this path. This extends the mean value theorem to Banach spaces. This can be used for the eventual proof of the Newton-Kantorovich theorem with 1 constant contained inside the added reference. Here is the discussion on Zulipchat: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Contributing.20FTC-2.20for.20Banach.20spaces	new-contributor t-measure-probability t-analysis merge-conflict awaiting-author	60/1	Mathlib/MeasureTheory/Integral/FundThmCalculus.lean	1	3	['github-actions', 'hrmacbeth', 'victorliu5296']	nobody	64-42101 2 months ago	64-42101 2 months ago	51-85104 51 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	63-80879 2 months ago	63-80879 2 months 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	63-80341 2 months ago	63-80343 2 months 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	63-78056 2 months ago	63-78056 2 months ago	30-8337 30 days
23402	mattrobball author:mattrobball	refactor(LinearAlgebra.TensorProduct): make `TensorProduct` irreducible	Mathematicians generally do not reason about tensor products using a particular model, precisely because the universal properties are more natural and the precise instantiations are too complicated for most purposes. Similarly, we shouldn't allow Lean to look inside `TensorProduct` and encourage building API on top of it to avoid definitional abuse. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	124/69	Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct/Isometries.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Subalgebra.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/Bialgebra/TensorProduct.lean,Mathlib/RingTheory/Coalgebra/TensorProduct.lean,Mathlib/RingTheory/Kaehler/CotangentComplex.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/LocalRing/Module.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	15	8	['eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	63-46361 2 months ago	63-46362 2 months ago	0-0 0 seconds
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	63-30956 2 months ago	63-30959 2 months ago	0-637 10 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	63-30956 2 months ago	63-30957 2 months ago	0-508 8 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	63-18110 2 months ago	63-18112 2 months 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	62-60473 2 months ago	62-60476 2 months ago	0-0 0 seconds
23786	grunweg author:grunweg	Mr librarynote def 2b	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict WIP	510/484	Archive/Imo/Imo2019Q2.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Algebra/Colimit/Ring.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/Field/MinimalAxioms.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/End.lean,Mathlib/Algebra/Group/Action/Hom.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/MinimalAxioms.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Scalar.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Equiv.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Module/ZMod.lean,Mathlib/Algebra/NoZeroSMulDivisors/Basic.lean,Mathlib/Algebra/NoZeroSMulDivisors/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/InjSurj.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Module/Defs.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/ExistsOfLE.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Star.lean,Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Order/Sub/Basic.lean,Mathlib/Algebra/Ring/Action/Basic.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/MinimalAxioms.lean,Mathlib/Algebra/Ring/Subring/Defs.lean,Mathlib/Algebra/Ring/Subsemiring/Defs.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Algebra/Star/StarRingHom.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Note.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/InnerProductSpace/Convex.lean,Mathlib/Analysis/InnerProductSpace/OfNorm.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Constructions.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Analysis/Normed/Order/Lattice.lean,Mathlib/Analysis/Normed/Ring/Basic.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/CategoryTheory/Comma/Over/OverClass.lean,Mathlib/CategoryTheory/Monoidal/Skeleton.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/FunLike/Fintype.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Init.lean	180	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	62-52574 2 months ago	62-52576 2 months ago	0-0 0 seconds
23411	PatrickMassot author:PatrickMassot	chore: remove finiteness from Order.Filter.Lift	Co-authored-by: Anatole Dedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	longest-pole t-topology merge-conflict	48/21	Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Order/Filter/Lift.lean,Mathlib/Order/Filter/SmallSets.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Basic.lean	7	4	['Vierkantor', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	62-38370 2 months ago	62-57939 2 months ago	10-21608 10 days
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	62-18755 2 months ago	62-18756 2 months ago	0-822 13 minutes
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	61-49004 2 months ago	61-49006 2 months ago	12-18679 12 days
19771	robertylewis author:robertylewis	perf: qqify two functions in linarith	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	17/24	Mathlib/Tactic/Linarith/Frontend.lean,Mathlib/Tactic/Linarith/Verification.lean	2	5	['github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'robertylewis']	nobody	61-28510 2 months ago	61-28511 2 months ago	0-0 0 seconds
22308	plp127 author:plp127	feat (Analysis/Convex): Generalize `Convex` lemmas to `StarConvex`	This PR generalizes many lemmas assuming `Convex 𝕜 s` to assume `StarConvex 𝕜 0 s`. --- - [x] depends on: #22421 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict WIP	30/18	Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/GaugeRescale.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/LocallyConvex/AbsConvexOpen.lean	4	5	['Paul-Lez', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	61-28021 2 months ago	61-28023 2 months ago	0-0 0 seconds
21488	imbrem author:imbrem	feat(CategoryTheory/Monoidal): premonoidal categories	Add support for premonoidal categories --- Still want to add support for: - Premonoidal braided/symmetric categories - The monoidal coherence theorem, which I've already ported in my `discretion` library - The `coherence` tactic, which should work fine for premonoidal categories too but wanted to get this in front of reviewers ASAP to make sure my general approach was alright [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory merge-conflict	900/361	Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/CoherenceLemmas.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,MathlibTest/StringDiagram.lean	21	9	['YaelDillies', 'github-actions', 'grunweg', 'imbrem', 'kim-em', 'leanprover-community-bot-assistant']	nobody	61-24289 2 months ago	61-24290 2 months ago	58-20339 58 days
21525	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Prelim)	This PR defines the basic preliminaries for defining locally cartesian closed categories (LCCCs). In particular, using the calculus of mates we define certain natural isomorphisms involving `Over.star` and `Over.pullback` which will be crucial in defining the right adjoint to the pullback functor in the development of LCCCs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict	338/24	Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Galois/Examples.lean	3	13	['b-mehta', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'sinhp']	nobody	61-24287 2 months ago	61-24289 2 months 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	61-23760 2 months ago	61-23762 2 months 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	61-23760 2 months ago	61-23761 2 months ago	0-336 5 minutes
13653	adomani author:adomani	feat: the unusedSetOptionIn linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	60-55125 1 month ago	60-55127 1 month ago	0-0 0 seconds
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	60-51088 1 month ago	60-51090 1 month ago	0-177 2 minutes
19425	hrmacbeth author:hrmacbeth	perf: gcongr forward-reasoning adjustment	This PR changes the "forward-reasoning" component of `gcongr`, rendering it more efficient, particularly in problems with a large number of variables/hypotheses in the context. Previously `gcongr` attempted to match every `LocalDecl` against every node in the parse tree using each of the five implemented `@[gcongr_forward]` mini-tactics: matching directly, matching after applying `symm`, matching after applying `le_of_lt`, etc etc. The new algorithm filters out the non-Prop `LocalDecl`s, and also adjusts the `@[gcongr_forward]` extensions so that, rather than re-apply the relevant lemmas (`symm`, `le_of_lt`, etc) at every node in the parse tree, the lemmas are applied in advance to the `LocalDecl`s and the result (if successful) stored. The performance effect on mathlib as a whole is miniscule, but it speeds up the profiler's count of "tactic execution of Mathlib.Tactic.GCongr" in the newly-added test from 257 ms to 47 ms, and has a similar effect on real-life examples in an analysis project of mine. Co-authored-by: Mario Carneiro --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) (Note that Mario provided the ideas but not the code, so please review with appropriate diligence!)	merge-conflict awaiting-author	130/59	Mathlib/Order/Lattice.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GCongr/ForwardAttr.lean,MathlibTest/GCongr/inequalities.lean	4	17	['Vierkantor', 'github-actions', 'hrmacbeth', 'leanprover-bot', 'leanprover-community-bot-assistant']	Vierkantor assignee:Vierkantor	60-36821 1 month ago	60-36823 1 month 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	60-27017 1 month ago	60-27017 1 month ago	55-53553 55 days
22817	peabrainiac author:peabrainiac	feat(CategoryTheory/Sites): local sites	Defines local sites and shows that sheaves of types on them form a local topos, in that the global sections functor `Sheaf.Γ` has a right adjoint `Sheaf.codisc` that is fully faithful. --- - [x] depends on: #22816 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	263/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/FunctorCategory/Shapes/Products.lean,Mathlib/CategoryTheory/Limits/Types.lean,Mathlib/CategoryTheory/Sites/GlobalSections.lean,Mathlib/CategoryTheory/Sites/LocalSite.lean,Mathlib/CategoryTheory/Sites/Sheaf.lean	6	4	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	59-47026 1 month ago	59-50549 1 month 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	59-21482 1 month ago	59-21484 1 month 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	59-19736 1 month ago	59-19738 1 month 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	59-858 1 month ago	328-69191 10 months ago	7-77799 7 days
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	57-54259 1 month ago	57-54261 1 month ago	3-60152 3 days
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	56-17842 1 month ago	58-50701 1 month 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	56-17720 1 month 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	55-49253 1 month ago	55-49255 1 month 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	55-47427 1 month ago	55-47429 1 month 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	55-41568 1 month ago	55-41570 1 month 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	55-32906 1 month ago	55-32908 1 month ago	14-12910 14 days
24060	eric-wieser author:eric-wieser	chore(MeasureTheory): use `0` instead of `const _ 0`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict	30/20	Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Function/SimpleFuncDense.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Countable.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/Probability/StrongLaw.lean	7	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	55-22601 1 month ago	55-22603 1 month 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	55-12511 1 month ago	55-74730 1 month 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	54-80906 1 month ago	325-21096 10 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	54-80825 1 month ago	335-23470 11 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	54-80785 1 month ago	335-23470 11 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	54-80760 1 month ago	325-21355 10 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	54-80586 1 month ago	335-23470 11 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	54-80546 1 month ago	303-32476 9 months ago	4-79214 4 days
16594	FR-vdash-bot author:FR-vdash-bot	perf: reorder `extends` and remove some instances in algebra hierarchy	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra merge-conflict label:t-algebra$	240/92	Mathlib.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Associated/Basic.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Prod.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Field/Canonical/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/Rat.lean,Mathlib/Algebra/Ring/SumsOfSquares.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean,Mathlib/CategoryTheory/Preadditive/FunctorCategory.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/Interval/Finset/Box.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/RingTheory/Ideal/Quotient.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/Util/NoInstances.lean,scripts/noshake.json	50	8	['FR-vdash-bot', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	54-80322 1 month ago	259-33469 8 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	54-52052 1 month ago	54-54359 1 month 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	54-47836 1 month ago	350-31180 11 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	54-47388 1 month ago	452-78060 1 year ago	0-0 0 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	53-16899 1 month ago	53-16899 1 month 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 --- - [x] depends on: #21834 - [ ] depends on: #21838 ### Follow-up PR: - #21842 ### Notes: - replaces: #21195 - should address: #8767 - should address: #20568 ### Completed: - [x] depends on: #21632 - [x] ~~depends on: #21663~~ - [x] depends on: #21666 - [x] depends on: #21701 - [x] depends on: #21703 - [x] depends on: #21704 - [x] depends on: #21705 - [x] depends on: #21707 - [x] depends on: #21711 - [x] depends on: #21750 - [x] depends on: #21815 - [x] depends on: #21816 - [x] depends on: #21817 - [x] depends on: #21818 - [x] depends on: #21822 - [x] depends on: #21830 - #21848 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI t-meta merge-conflict blocked-by-other-PR	231/118	Cache/Hashing.lean,Cache/IO.lean,Cache/Main.lean	3	n/a	['github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	53-4165 1 month ago	unknown	unknown
21842	joneugster author:joneugster	refactor(Cache): use module name for file hash instead of non-resolved file path	This invalidates cache once, similarly to when the `lean-toolchain` gets bumped or the `lakefile` modified. --- - [ ] depends on: #21238 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI t-meta merge-conflict blocked-by-other-PR	284/139	Cache/Hashing.lean,Cache/IO.lean,Cache/Lean.lean,Cache/Main.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	53-4041 1 month ago	116-1064 3 months ago *	0-0 0 seconds *
19467	quangvdao author:quangvdao	feat(MvPolynomial/Equiv): Add `MvPolynomial.finSuccEquivNth`	This PR adds `MvPolynomial.finSuccEquivNth`, which is the algebra isomorphism between `MvPolynomial (Fin (n + 1)) R` and `Polynomial (MvPolynomial (Fin n) R)` by identifying the `p`-th variable as the indeterminate. This generalizes `MvPolynomial.finSuccEquiv` which is only for the `0`-th variable. The supporting theorems for the `Nth` version are identical to the current version, with the `Nth` version deduced from the former. These changes require new definitions in `Finsupp/Fin`, which is a separate PR. Co-authored-by: Yaël Dillies --- - [ ] depends on: #19315 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	541/163	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Finsupp/Fin.lean,scripts/nolints_prime_decls.txt	7	9	['acmepjz', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'quangvdao']	nobody	52-84662 1 month ago	52-84662 1 month 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	52-84649 1 month ago	52-84649 1 month 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	52-84615 1 month ago	52-84615 1 month ago	25-60481 25 days
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	52-84501 1 month ago	52-84501 1 month ago	0-1327 22 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	52-84444 1 month ago	52-84444 1 month 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	52-83293 1 month ago	52-83293 1 month 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	52-82507 1 month ago	61-79903 2 months ago	0-15 15 seconds
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	52-80768 1 month ago	unknown	unknown
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	52-80747 1 month ago	52-80747 1 month ago	13-60072 13 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	52-5824 1 month ago	52-5826 1 month ago	0-3406 56 minutes
19117	eric-wieser author:eric-wieser	feat: derivatives of matrix operations	These are finally possible to state after #19108. However, a lot of bundled `ContinuousLinearMap`s are missing. --- - [x] depends on: #19108 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict WIP	336/22	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Matrix.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Matrix.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	51-16725 1 month ago	51-16727 1 month ago	0-0 0 seconds
12605	FR-vdash-bot author:FR-vdash-bot	chore: attribute [induction_eliminator]	Add attribute [induction_eliminator] to `AdjoinRoot.induction_on` `ENat.recTopCoe` `ENNReal.recTopCoe` `Finset.induction` `Magma.AssocQuotient.induction_on` `ManyOneDegree.ind_on` `Module.Ray.ind` (and add `Orientation.ind` for `Orientation`, an abbrev of it. I wish that we do not need to add it in the future.) `Multiset.induction` `MvPolynomial.induction_on` `OnePoint.rec` `Opposite.rec'` `Ordinal.limitRecOn` `PartENat.casesOn` `Polynomial.induction_on'` `QuotientAddGroup.induction_on'` (and add `AddCircle.induction_on` for `AddCircle`, an abbrev of it. I wish that we do not need to add it in the future.) `QuotientGroup.induction_on'` (doesn't actually work) `Real.Angle.induction_on` `SimplexCategory.rec` `Trunc.induction_on` --- - [x] depends on: #13476 - [x] depends on: #13264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	354/342	Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Group/Finset.lean,Mathlib/Algebra/BigOperators/Group/Multiset.lean,Mathlib/Algebra/BigOperators/Ring.lean,Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/GCDMonoid/Multiset.lean,Mathlib/Algebra/Group/Subgroup/Finite.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/Weights/Basic.lean,Mathlib/Algebra/Module/BigOperators.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Derivation.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Eval.lean,Mathlib/Algebra/Polynomial/Induction.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Algebra/Polynomial/PartialFractions.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/Algebra/Tropical/BigOperators.lean,Mathlib/AlgebraicTopology/DoldKan/NCompGamma.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SplitSimplicialObject.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Asymptotics/Asymptotics.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/Deriv/Polynomial.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Analysis/NormedSpace/Exponential.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/PolynomialExp.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/SetFamily/Compression/Down.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SetFamily/HarrisKleitman.lean,Mathlib/Computability/Reduce.lean,Mathlib/Data/DFinsupp/Basic.lean,Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Lattice.lean,Mathlib/Data/Finset/NAry.lean,Mathlib/Data/Fintype/Sum.lean,Mathlib/Data/Multiset/Antidiagonal.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Fold.lean,Mathlib/Data/Multiset/Lattice.lean,Mathlib/Data/Multiset/Pi.lean,Mathlib/Data/Multiset/Powerset.lean,Mathlib/Data/Multiset/Sections.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Set/Pointwise/BigOperators.lean,Mathlib/FieldTheory/IntermediateField.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/RingedSpace/Basic.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace/Gluing.lean,Mathlib/GroupTheory/Coset.lean,Mathlib/GroupTheory/NoncommPiCoprod.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/LinearAlgebra/FiniteDimensional.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/Logic/Hydra.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/Lebesgue.lean,Mathlib/MeasureTheory/Integral/Marginal.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean,Mathlib/MeasureTheory/Measure/AddContent.lean	140	14	['FR-vdash-bot', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	51-11340 1 month ago	337-25266 11 months ago	4-46495 4 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 merge-conflict blocked-by-other-PR	3/614	Shake/Main.lean,lake-manifest.json,lakefile.lean	3	5	['Vierkantor', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	49-14973 1 month ago	49-14975 1 month ago	0-894 14 minutes
15099	joelriou author:joelriou	feat(CategoryTheory/Sites): the Mayer-Vietoris long exact sequence in sheaf cohomology	In this PR, we obtain the long exact Mayer-Vietoris sequence in sheaf cohomology `... ⟶ H^n₀(S.X₄, F) ⟶ H^n₀(S.X₂, F) ⊞ H^n₀(S.X₃, F) ⟶ H^n₀(S.X₁, F) ⟶ H^n₁(S.X₄, F) ⟶ ...` when `n₀ + 1 = n₁`. It is attached to any "Mayer-Vietoris square", which includes the typical case of a covering by two open subsets in a topological space. (This API shall also apply to the case of Nisnevich distinguished squares of schemes.) --- - [x] depends on: #15770 - [x] depends on: #14793 - [x] depends on: #14515 - [x] depends on: #15092 - [x] depends on: #15053 - [x] depends on: #14867 - [x] depends on: #14959 - [x] depends on: #14957 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	348/4	Mathlib.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Biprod.lean,Mathlib/CategoryTheory/Preadditive/Opposite.lean,Mathlib/CategoryTheory/Shift/Basic.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/Basic.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/MayerVietoris.lean	8	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	48-41187 1 month ago	unknown	unknown
23859	urkud author:urkud	feat(Topology/../Order/Field): generalize to `Semifield`	.. from a linear ordered field to a linear ordered semifield--- - [ ] depends on: #23857 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	245/219	Mathlib/Algebra/Order/Group/Pointwise/Interval.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Topology/Algebra/Order/Field.lean,Mathlib/Topology/Order/Basic.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	48-37163 1 month ago	48-37166 1 month ago	0-265 4 minutes
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 merge-conflict 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	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	48-29614 1 month ago	48-29616 1 month ago	0-687 11 minutes
22908	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/Finiteness/Small): tensor product of the system of small submodules	The directed limit of a tensor product for the directed system of small submodules. Co-authored with @mariainesdff --- - [ ] depends on: #22898 - [x] depends on: #22911 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-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	47-80875 1 month ago	74-15438 2 months ago	0-3552 59 minutes
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 merge-conflict	229/174	Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,MathlibTest/toAdditive.lean	3	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	47-40689 1 month ago	47-40691 1 month ago	0-0 0 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 merge-conflict 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	13	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	47-25576 1 month ago	47-25578 1 month ago	46-65043 46 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 merge-conflict	231/89	Mathlib/Order/Interval/Finset/SuccPred.lean,Mathlib/Order/Interval/Set/SuccPred.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	46-13938 1 month ago	46-13940 1 month ago	16-29623 16 days
24285	madvorak author:madvorak	chore(Algebra/*-{Category,Homology}): remove unnecessary universe variables	Discussions: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Call.20for.20help.3A.20technical.2F.20organisational.20debt/with/513620128 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Algebra.20and.20.60Type.60/with/513558902 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Task.2026.3A.20Replace.20Type.20u.20by.20Type.20wherever.20possible/with/513592993 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	542/916	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Field.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Central/Basic.lean,Mathlib/Algebra/Central/Defs.lean,Mathlib/Algebra/Central/TensorProduct.lean,Mathlib/Algebra/CharP/Pi.lean,Mathlib/Algebra/CharP/Quotient.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Finsupp.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/Algebra/Field/MinimalAxioms.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/FreeNonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Finite.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Invertible/Defs.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/TypeTags/Finite.lean,Mathlib/Algebra/Group/TypeTags/Hom.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/Group/WithOne/Basic.lean,Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Pi.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/NeZero.lean,Mathlib/Algebra/Lie/Abelian.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/CartanMatrix.lean,Mathlib/Algebra/Lie/CartanSubalgebra.lean,Mathlib/Algebra/Lie/Character.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/DirectSum.lean,Mathlib/Algebra/Lie/Free.lean,Mathlib/Algebra/Lie/Ideal.lean,Mathlib/Algebra/Lie/IdealOperations.lean,Mathlib/Algebra/Lie/Matrix.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/NonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Solvable.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/Algebra/Lie/UniversalEnveloping.lean,Mathlib/Algebra/Module/Basic.lean,Mathlib/Algebra/Module/CharacterModule.lean,Mathlib/Algebra/Module/DedekindDomain.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/Equiv/Opposite.lean,Mathlib/Algebra/Module/Lattice.lean,Mathlib/Algebra/Module/LinearMap/Basic.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/MinimalAxioms.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Module/Opposite.lean,Mathlib/Algebra/Module/Pi.lean,Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/CommRing.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean	182	22	['erdOne', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'madvorak', 'mattrobball']	nobody	46-2635 1 month ago	46-2636 1 month ago	2-12022 2 days
8370	eric-wieser author:eric-wieser	refactor(Analysis/NormedSpace/Exponential): remove the `𝕂` argument from `exp`	This argument is still needed for almost all the lemmas, which means it can longer be found by unification. We keep around `expSeries 𝕂 A`, as it's needed for talking about the radius of convergence over different base fields. This is a prerequisite for #8372, as we can't merge the functions until they have the same interface.\ Zulip thread: [#mathlib4 > Real.exp @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Real.2Eexp/near/401602245) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This is started from the mathport output on https://github.com/leanprover-community/mathlib/pull/19244	awaiting-zulip t-analysis merge-conflict	432/387	Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/Analysis/Normed/Algebra/QuaternionExponential.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/NormedSpace/DualNumber.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean	11	29	['YaelDillies', 'eric-wieser', 'girving', 'github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-community-bot-assistant', 'urkud']	nobody	45-69965 1 month ago	57-12195 1 month ago	29-60989 29 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']	kbuzzard assignee:kbuzzard	45-2205 1 month ago	unknown	unknown
14931	eric-wieser author:eric-wieser	feat: volume of a simplex	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry merge-conflict	207/0	Mathlib/Geometry/Euclidean/Basic.lean,Mathlib/Geometry/Euclidean/Circumcenter.lean,Mathlib/Geometry/Euclidean/Volume.lean	3	3	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	44-15092 1 month ago	44-15094 1 month ago	0-0 0 seconds
22583	imathwy author:imathwy	feat: affinespace homeomorphism	There exists a homeomorphism (a continuous bijection with a continuous inverse) between an affine subspace s of a vector space V over a field 𝕜 and its direction s.direction , given a chosen point z ∈ s . --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	64/2	Mathlib/Analysis/Normed/Group/AddTorsor.lean,Mathlib/LinearAlgebra/AffineSpace/ContinuousAffineEquiv.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/MulAction.lean	4	6	['JovanGerb', 'eric-wieser', 'github-actions', 'grunweg']	nobody	44-12810 1 month ago	84-57903 2 months ago	0-18122 5 hours
21719	bryangingechen author:bryangingechen	to_dual attribute	Builds on #21696: https://github.com/leanprover-community/mathlib4/compare/bgc-to-additive-0...bgc-order-dual-scratch-0 TODO: - `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 merge-conflict blocked-by-other-PR	1219/491	Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/NatTrans.lean,Mathlib/Combinatorics/Quiver/Basic.lean,Mathlib/Combinatorics/Quiver/Prefunctor.lean,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/OrdContinuous.lean,Mathlib/Order/TypeTags.lean,Mathlib/Order/WithBot.lean,Mathlib/Tactic/CategoryTheory/Reassoc.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,MathlibTest/orderDual.lean,MathlibTest/toAdditive.lean	19	5	['JovanGerb', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	43-65088 1 month ago	47-40690 1 month ago	0-0 0 seconds
24243	Timeroot author:Timeroot	feat(Analysis/Calculus/FDeriv): Fderiv on torsors	Experiment to see how this goes for now, see [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Upgrade.20.60fderiv.60.20to.20.60AddTorsor.60) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	539/447	Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Prod.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Bilinear.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/FDeriv/Linear.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/Gradient/Basic.lean,Mathlib/Analysis/Calculus/LineDeriv/Basic.lean,Mathlib/Analysis/Calculus/LocalExtr/Basic.lean,Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/Analysis/Calculus/Rademacher.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Periodic.lean,Mathlib/Analysis/Complex/RealDeriv.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/SpecialFunctions/ExpDeriv.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/EulerSineProd.lean,Mathlib/Geometry/Manifold/IntegralCurve/Transform.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/NumberTheory/EulerProduct/ExpLog.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean,Mathlib/NumberTheory/LSeries/Nonvanishing.lean,MathlibTest/Recall.lean	37	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	42-82348 1 month ago	42-82349 1 month ago	0-0 0 seconds
24322	mattrobball author:mattrobball	chore: merge repeated `Type*` binders	Per the discussion on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Task.2026.3A.20Replace.20Type.20u.20by.20Type.20wherever.20possible), this PR merges `(A : Type) (B : Type u)` into `(A B : Type*)` and similarly for `{}`. NOTE: the Python script used it currently in the `/scripts` folder. It is there for inspection and should be removed before merging this PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	685/591	Archive/Imo/Imo2019Q2.lean,Archive/Wiedijk100Theorems/HeronsFormula.lean,Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/Faithful.lean,Mathlib/Algebra/Group/Action/Sigma.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Algebra/Group/Support.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/Prod.lean,Mathlib/Algebra/Module/Prod.lean,Mathlib/Algebra/Module/Submodule/EqLocus.lean,Mathlib/Algebra/Module/Submodule/Equiv.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/LinearMap.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Comap.lean,Mathlib/Algebra/MvPolynomial/Monad.lean,Mathlib/Algebra/Notation/Prod.lean,Mathlib/Algebra/Order/Quantale.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Quandle.lean,Mathlib/Algebra/QuaternionBasis.lean,Mathlib/Algebra/Ring/CompTypeclasses.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/Star/Module.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/Algebra/Vertex/HVertexOperator.lean,Mathlib/Algebra/Vertex/VertexOperator.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Convex/Cone/Proper.lean,Mathlib/Analysis/Convex/EGauge.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Defs.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/InnerProductSpace/Orthonormal.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/WeakOperatorTopology.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Algebra/Basic.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Ring/InfiniteSum.lean,Mathlib/Analysis/Normed/Ring/Lemmas.lean,Mathlib/Analysis/NormedSpace/ConformalLinearMap.lean,Mathlib/Analysis/NormedSpace/ENormedSpace.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Bilinear.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/GradedObject.lean	343	3	['github-actions', 'leanprover-community-bot-assistant', 'urkud']	nobody	42-81826 1 month ago	42-81828 1 month ago	2-7052 2 days
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	1316/3	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	42-30320 1 month ago	80-6601 2 months ago	0-1 1 second
23593	erdOne author:erdOne	feat(AlgebraicGeometry): the tilde construction is functorial	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict awaiting-author	95/38	Mathlib/AlgebraicGeometry/Modules/Sheaf.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean	2	4	['chrisflav', 'github-actions', 'leanprover-community-bot-assistant']	nobody	42-30006 1 month ago	42-30008 1 month ago	0-71091 19 hours
21065	eric-wieser author:eric-wieser	feat: generalize `tangentConeAt.lim_zero` to TVS	... and then adjust the `variable`s down the rest of the file to make use of the generality. There are two key lemmas that this does not generalize, which would probably unlock the rest of the file: * `subset_tangentCone_prod_left` (and `_right`) * `zero_mem_tangentCone` --- - [ ] depends on: #20859 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict WIP	55/28	Mathlib/Analysis/Calculus/TangentCone.lean	1	16	['ADedecker', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	42-22410 1 month ago	42-22412 1 month ago	23-20319 23 days
22721	grunweg author:grunweg	chore(MeasureTheory/Function/LpSeminorm/Basic): generalise more results to enorm classes	Done for the Carleson project. --- - depends on #22708 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson t-measure-probability merge-conflict WIP	134/10	Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	41-15078 1 month ago	41-15080 1 month ago	0-6 6 seconds
24354	grunweg author:grunweg	chore(HasFiniteIntegral): rename three lemmas	Discovered in #24343. --- - [ ] depends on: #24343 (to avoid merge conflicts) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict	108/30	Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	41-7039 1 month ago	41-7040 1 month ago	0-4604 1 hour
23791	SEU-Prime author:SEU-Prime	Create AmiceTrans.lean	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-number-theory merge-conflict WIP	2963/0	Mathlib.lean,Mathlib/Analysis/Normed/Ring/Lemmas2.lean,Mathlib/NumberTheory/Padics/AmiceTrans.lean,Mathlib/NumberTheory/Padics/PSAC.lean,Mathlib/NumberTheory/Padics/PSAC2.lean,Mathlib/NumberTheory/Padics/PSAC3.lean,Mathlib/NumberTheory/Padics/PiGammainPS.lean,Mathlib/NumberTheory/Padics/PsiandVar.lean,Mathlib/RingTheory/AdicCompletion/Lemma.lean,Mathlib/RingTheory/PowerSeries/Comp.lean,Mathlib/Topology/ContinuousMap/ZeroAtBot.lean	11	3	['SEU-Prime', 'github-actions', 'leanprover-community-bot-assistant']	nobody	40-54359 1 month ago	47-33365 1 month ago	0-0 0 seconds
24091	mattrobball author:mattrobball	test		merge-conflict	97/46	Mathlib/Algebra/Field/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/Normed/Affine/AddTorsor.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/Span.lean,Mathlib/Analysis/Normed/MulAction.lean,Mathlib/Analysis/NormedSpace/Pointwise.lean,Mathlib/Dynamics/BirkhoffSum/NormedSpace.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/Topology/ContinuousMap/Compact.lean,Mathlib/Topology/MetricSpace/Holder.lean,Mathlib/Topology/MetricSpace/HolderNorm.lean,docs/overview.yaml,docs/undergrad.yaml	15	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	40-43777 1 month ago	40-43779 1 month ago	0-0 0 seconds
18771	joelriou author:joelriou	feat(LinearAlgebra/ExteriorPower): exterior powers of free modules are free	Co-authored-by: sophie.morel@ens-lyon.fr --- - [ ] depends on: #18662 - [ ] 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	40-23621 1 month ago	206-40834 6 months ago	0-0 0 seconds
18735	joelriou author:joelriou	feat(Algebra/Module): presentation of the exterior power	Given a presentation of a `R`-module `M`, we obtain a presentation of `⋀[R]^n M`. --- (Still one sorry left.) - [ ] depends on: #18527 - [ ] depends on: #18432 - [ ] depends on: #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	40-23618 1 month ago	206-40836 6 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	40-23614 1 month ago	206-40838 6 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	40-23612 1 month ago	unknown	unknown
14731	adomani author:adomani	feat: the repeated typeclass assumption linter	[#mathlib4 > recyclable variables @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/recyclable.20variables/near/451167963) also [#mathlib4 > Normed modules @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Normed.20modules/near/512242167) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict WIP	178/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/DependentTypeclass.lean,MathlibTest/DependentTypeclass.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	40-20317 1 month ago	52-37719 1 month ago	0-109 1 minute
24140	mattrobball author:mattrobball	test		merge-conflict	176/91	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Data/Complex/Module.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/RingTheory/Algebraic/Integral.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/RingHom/Unramified.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	17	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	40-18780 1 month ago	40-18782 1 month ago	0-0 0 seconds
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$	504/4	Mathlib.lean,Mathlib/Algebra/Module/Presentation/PiTensor.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean	8	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	38-15866 1 month ago	38-15868 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/)	merge-conflict	63/88	Mathlib/Computability/Primrec.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Size.lean,Mathlib/Logic/Denumerable.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Nat.lean	8	15	['FR-vdash-bot', 'digama0', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	digama0 assignee:digama0	37-72585 1 month ago	37-72587 1 month ago	87-51692 87 days
22856	mattrobball author:mattrobball	test		merge-conflict	8/2	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/RCLike/Inner.lean,Mathlib/FieldTheory/Galois/Profinite.lean	4	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	37-60146 1 month ago	37-60148 1 month ago	0-0 0 seconds
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 merge-conflict blocked-by-other-PR	403/1	Mathlib/Data/Nat/GCD/Basic.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/SelbergSieve.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	37-60022 1 month ago	37-60023 1 month ago	0-18 18 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 merge-conflict 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	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	37-59898 1 month ago	37-59899 1 month ago	0-0 0 seconds
24275	joelriou author:joelriou	feat(Algebra/Homology): the canonical t-structure on the derived category	--- - [x] depends on: #22574 - [ ] depends on: #24191 - [ ] depends on: #24276 [![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	909/191	Mathlib.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/TStructure.lean,Mathlib/Algebra/Homology/Embedding/CochainComplex.lean,Mathlib/Algebra/Homology/Embedding/ComplementaryTrunc.lean,Mathlib/Algebra/Homology/Embedding/TruncLEHomology.lean,Mathlib/CategoryTheory/ObjectProperty/ContainsZero.lean,Mathlib/CategoryTheory/ObjectProperty/Shift.lean,Mathlib/CategoryTheory/Triangulated/HomologicalFunctor.lean,Mathlib/CategoryTheory/Triangulated/Subcategory.lean,Mathlib/CategoryTheory/Triangulated/TStructure/Basic.lean	11	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	37-59772 1 month ago	37-59773 1 month ago	0-0 0 seconds
24549	grunweg author:grunweg	feat: define embedded submanifolds, attempt 1	Not meant to be merged (I think a different design is better); opening this so I can find this more easily. --- - [ ] depends on: #23040 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	1445/2	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean,Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/EmbeddedSubmanifold.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MSplits.lean,Mathlib/LinearAlgebra/Prod.lean	8	2	['leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	37-45530 1 month ago	37-45530 1 month ago	0-1 1 second
23921	alreadydone author:alreadydone	Jyxu/projective trace	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	157/123	Mathlib/FieldTheory/CardinalEmb.lean,Mathlib/FieldTheory/Relrank.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/RingTheory/LocalProperties/Projective.lean	5	1	['leanprover-community-bot-assistant']	nobody	37-45362 1 month ago	37-45362 1 month ago	0-0 0 seconds
21252	ADedecker author:ADedecker	feat: redefine uniformly convex normed spaces with filters instead of epsilons	And conceptualize some proofs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	301/87	Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Topology/Algebra/UniformGroup/Defs.lean,Mathlib/Topology/Algebra/UniformMulAction.lean	6	1	['github-actions']	nobody	37-45101 1 month ago	37-45101 1 month ago	0-0 0 seconds
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/)	t-topology 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	37-44931 1 month ago	37-44931 1 month ago	0-0 0 seconds
19821	eric-wieser author:eric-wieser	feat: add a Qq version of AtomM that groups by type	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta merge-conflict WIP	332/30	Mathlib/Data/Ineq.lean,Mathlib/Tactic/Linarith/Datatypes.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm.lean,Mathlib/Tactic/Linarith/Preprocessing.lean,Mathlib/Util/AtomM.lean,Mathlib/Util/Qq.lean	6	1	['github-actions']	nobody	37-44914 1 month ago	37-44914 1 month ago	0-0 0 seconds
19520	erdOne author:erdOne	refactor(Algebra/Module): Redefine `LocalizedModule` in terms of `OreLocalization`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	610/493	Mathlib.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Module.lean,Mathlib/RingTheory/OreLocalization/Ring.lean	10	1	['github-actions']	nobody	37-44903 1 month ago	37-44903 1 month ago	8-56155 8 days
19120	hrmacbeth author:hrmacbeth	feat: stop `ring`/`abel` from seeing algebraic operations inside `let`s	This draft PR illustrates a feature I would like to see in core: a variant of `whnf` which allows particular kinds of reduction, such as zeta-delta reduction, to be turned off. Here it is used to make ring-normalization and abelian-group-normalization a bit more responsive to what (I think) users expect: these normalizations would no longer look inside user-defined lets to see algebraic operations in those expressions. Note: In Lean/Mathlib 3, `ring` matched for algebraic operations on an algebraic expression `e` itself, not on `← whnfR e`. So mathlib3 `ring` didn't see algebraic operations inside `let`s -- but it also didn't see algebraic operations requiring beta-reduction (like `(fun t ↦ t + 1) x`) or see inside abbreviations. [Zulip](https://leanprover.zulipchat.com/#narrow/channel/239415-metaprogramming-.2F-tactics/topic/whnf.20variant.20which.20preserves.20let-bindings) Update: fortuitously, it looks like the new core PR https://github.com/leanprover/lean4/pull/6053 will provide this feature! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict blocked-by-core-PR	137/15	Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Mathlib.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Integrals.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Data/Real/Pi/Irrational.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaOdd.lean,Mathlib/NumberTheory/SumPrimeReciprocals.lean,Mathlib/RingTheory/WittVector/DiscreteValuationRing.lean,Mathlib/Tactic/Abel.lean,Mathlib/Tactic/Polyrith.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Tactic/Ring/RingNF.lean,Mathlib/Topology/MetricSpace/GromovHausdorff.lean,Mathlib/Util/WHNF.lean,MathlibTest/abel.lean,MathlibTest/ring.lean	21	5	['JovanGerb', 'github-actions', 'grunweg', 'hrmacbeth']	nobody	37-44894 1 month ago	37-44894 1 month ago	0-0 0 seconds
17069	yuma-mizuno author:yuma-mizuno	chore(CategoryTheory/Functor/Basic): put `simp` at `Functor.id_comp`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	41/30	Mathlib/CategoryTheory/Adjunction/Mates.lean,Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/CategoryTheory/GuitartExact/VerticalComposition.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Shift/CommShift.lean	5	3	['github-actions', 'leanprover-bot', 'yuma-mizuno']	nobody	37-44884 1 month ago	37-44884 1 month ago	0-0 0 seconds
15024	mattrobball author:mattrobball	chore(Algebra.Basic): scope and rename universal `Nat`-algebra and `Int`-algebra instances	We rename `algebraNat` to `Nat.instAlgebraOfSemiring` and `algebraInt` to `Int.instAlgebraOfRing` to be consistent with existing naming conventions. We also scope them to avoid typeclass search tripping over them unnecessarily. --- Moves: - algebraNat -> Nat.instAlgebraOfSemiring - algebraInt -> Int.instAlgebraOfRing [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	178/27	Archive/Wiedijk100Theorems/AbelRuffini.lean,Counterexamples/Pseudoelement.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Unitization.lean,Mathlib/Algebra/Category/ModuleCat/Injective.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Module/Bimodule.lean,Mathlib/Algebra/Module/Zlattice/Basic.lean,Mathlib/Algebra/MvPolynomial/Counit.lean,Mathlib/Algebra/MvPolynomial/Supported.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/DenomsClearable.lean,Mathlib/Algebra/Polynomial/UnitTrinomial.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Data/Matrix/Kronecker.lean,Mathlib/Data/Real/Irrational.lean,Mathlib/FieldTheory/IsAlgClosed/Classification.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/LinearAlgebra/FreeModule/IdealQuotient.lean,Mathlib/LinearAlgebra/FreeProduct/Basic.lean,Mathlib/LinearAlgebra/Matrix/Adjugate.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/TensorAlgebra/Basic.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleCardPowDegree.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/Cyclotomic/Basic.lean,Mathlib/NumberTheory/Cyclotomic/Discriminant.lean,Mathlib/NumberTheory/Cyclotomic/Rat.lean,Mathlib/NumberTheory/FLT/Three.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticChar/GaussSum.lean,Mathlib/NumberTheory/Liouville/Basic.lean,Mathlib/NumberTheory/Liouville/LiouvilleNumber.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Defs.lean,Mathlib/NumberTheory/ModularForms/Identities.lean,Mathlib/NumberTheory/ModularForms/JacobiTheta/OneVariable.lean,Mathlib/NumberTheory/ModularForms/SlashActions.lean,Mathlib/NumberTheory/ModularForms/SlashInvariantForms.lean,Mathlib/NumberTheory/MulChar/Lemmas.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/NumberTheory/NumberField/ClassNumber.lean,Mathlib/NumberTheory/NumberField/Discriminant.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/FractionalIdeal.lean,Mathlib/NumberTheory/NumberField/Norm.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/RepresentationTheory/Maschke.lean,Mathlib/RingTheory/Adjoin/Basic.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/Discriminant.lean,Mathlib/RingTheory/FractionalIdeal/Norm.lean,Mathlib/RingTheory/Ideal/Norm.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Expand.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Roots.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/Polynomial/Hermite/Gaussian.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean,Mathlib/RingTheory/RootsOfUnity/Lemmas.lean,Mathlib/RingTheory/RootsOfUnity/Minpoly.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/Trace/Basic.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/RingTheory/WittVector/Defs.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/InitTail.lean,Mathlib/RingTheory/WittVector/IsPoly.lean,Mathlib/RingTheory/WittVector/MulP.lean,Mathlib/RingTheory/WittVector/StructurePolynomial.lean,Mathlib/RingTheory/WittVector/Verschiebung.lean	80	6	['eric-wieser', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	37-44873 1 month ago	37-44873 1 month ago	0-0 0 seconds
14803	StevenClontz author:StevenClontz	chore: use `Disjoint` nhd filters for all separation axioms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	157/122	Mathlib/Topology/Separation.lean	1	1	['github-actions']	nobody	37-44868 1 month ago	37-44869 1 month ago	0-0 0 seconds
14675	adomani author:adomani	dev: the repeated variable linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict WIP	71/0	Mathlib/Tactic/Linter/Lint.lean	1	1	['github-actions']	nobody	37-44863 1 month ago	37-44863 1 month ago	0-8 8 seconds
14330	Ruben-VandeVelde author:Ruben-VandeVelde	chore: split Mathlib.Algebra.Star.Basic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	446/331	Mathlib.lean,Mathlib/Algebra/Module/LinearMap/Star.lean,Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/BigOperators.lean,Mathlib/Algebra/Star/Defs.lean,Mathlib/Algebra/Star/Lemmas.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Star/Pi.lean,Mathlib/Algebra/Star/Pointwise.lean,Mathlib/Algebra/Star/Rat.lean,Mathlib/Algebra/Star/Regular.lean,Mathlib/Algebra/Star/StarRingHom.lean,Mathlib/Analysis/NormedSpace/LinearIsometry.lean,Mathlib/Data/Complex/Basic.lean,scripts/noshake.json	15	3	['github-actions', 'grunweg', 'j-loreaux']	nobody	37-44823 1 month ago	37-44849 1 month ago	0-45204 12 hours
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	7	['fpvandoorn', 'github-actions', 'grunweg', 'leanprover-bot', 'mattrobball']	nobody	37-44778 1 month ago	327-40374 10 months ago	0-0 0 seconds
14023	mattrobball author:mattrobball	perf(RingTheory.OreLocalization): make data irreducible	We generally do not want to unfold operations passing through `Quotient` if we can avoid it for performance reasons. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	43/32	Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Ring.lean	3	5	['github-actions', 'grunweg', 'leanprover-bot', 'mattrobball']	nobody	37-44718 1 month ago	345-34541 11 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/)	t-linter merge-conflict WIP	249/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/Papercut.lean,test/Papercut.lean	5	1	['github-actions']	nobody	37-44708 1 month ago	37-44708 1 month ago	0-0 0 seconds
20354	eric-wieser author:eric-wieser	feat: generalize `ContinuousLinearMap.curry` to TVS	Follow on from #10777 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	57/25	Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean	1	3	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	37-44643 1 month ago	37-44643 1 month ago	0-0 0 seconds
11523	thorimur author:thorimur	bench: test syntax linter	--- The purpose of this PR is just to bench the "best-case scenario" for a linter which iterates through syntax, updating and checking a simple counter along the way. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	22/0	Mathlib.lean,Mathlib/Command/Linter.lean,Mathlib/Tactic/Common.lean	3	3	['grunweg', 'leanprover-bot', 'thorimur']	nobody	37-44552 1 month ago	37-44552 1 month ago	0-0 0 seconds
8511	eric-wieser author:eric-wieser	refactor(MeasureTheory/Measure/Haar/Basic): partially generalize to the affine case	Without a `Mul` version of `AddTorsor`, this generalization can only go so far. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict awaiting-author	52/46	Mathlib/MeasureTheory/Measure/Haar/Basic.lean	1	0	[]	nobody	37-44454 1 month ago	37-44454 1 month ago	0-0 0 seconds
7994	ericrbg author:ericrbg	chore: generalize `LieSubalgebra.mem_map_submodule`	--- Not sure if we should rename to something like `mem_map_iff_mem_map_submodule` or not. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict please-adopt label:t-algebra$	16/4	Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Subalgebra.lean	2	3	['eric-wieser', 'ericrbg']	nobody	37-44442 1 month ago	37-44442 1 month ago	0-0 0 seconds
6317	eric-wieser author:eric-wieser	refactor(Data/Finsupp/Defs): make Finsupp.single defeq to Pi.single	By adding a `DecidableEq ι` argument to `Finsupp.single`, we remove the reference to `Classical.decEq ι` in the definition, which in turn means that when coerced to a function it is now defeq to `Pi.single`. This also brings it in line with `DFinsupp.single`. This does not go as far as making `Finsupp.single` computable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict WIP	269/226	Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Data/Finsupp/AList.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Fintype.lean,Mathlib/Data/Finsupp/Indicator.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Finsupp/ToDFinsupp.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/LinearAlgebra/Finsupp.lean	12	0	[]	nobody	37-44436 1 month ago	37-44436 1 month ago	0-0 0 seconds
6277	jjaassoonn author:jjaassoonn	Dimension theory	Some results are - The ring Krull dimension and the topological dimension of the prime spectrum of a ring are the same - A field is zero-dimensional and a PID that is not a field is one dimensional - An Artinian ring is zero-dimensional - The Krull dimension of ring $R$ is equal to the supremum of heights of maximal ideals [00KG](https://stacks.math.columbia.edu/tag/00KG) - two definitions of module length agree - A module is finite length iff both artinian and noetherian - length of module $M$ is equal to the sum of length of $N$ and length of $M / N$ where $N$ is a submodule of $M$. - Noetherian ring has only finitely many minimal primes #9088 - In a zero dimensional ring, prime ideals are maximal - Artinian rings has finitely many maximal ideals #9087 - zero-dimensional rings with finitely many prime ideals are products of its localizations: $R \cong \prod_{\mathfrak{p}}R_{\mathfrak{p}}$ - Let $M_0 \le ... \le M_n$, then $l(M_n/ M_0) = l(M_1/M_0) + l(M_2/M_1) + ... + l(M_n/M_{n-1})$ where $l$ denotes module length. - If $f : R \to S$ is a ring homomorphism and $M$ an $S$-module, then $l_R(M) \le l_S(M)$, when $f$ is surjective then they are equal. (Note that this is expressed using `[Algebra R S]` and `RestrictScalars R S M`, instead of a literal ring hom) - Artinian rings are noetherian ring of dimension 0. - For 0-dimensional local ring, its maximal ideal is locally nilpotent - In notherian ring, $I \le \sqrt{J}$ implies $I ^ n \le J$ for some $n$ --- - [x] depends on: #6309 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	3289/459	Mathlib.lean,Mathlib/Algebra/Module/Length.lean,Mathlib/Algebra/Module/Submodule/JordanHolder.lean,Mathlib/Algebra/PUnitInstances.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/ArtinianAndNoetherian.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Dedup.lean,Mathlib/Data/List/Nodup.lean,Mathlib/LinearAlgebra/Quotient.lean,Mathlib/Order/Cover.lean,Mathlib/Order/JordanHolder.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/ListOnPartialOrderTypes.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Order/RelSeries.lean,Mathlib/RingTheory/Artinian.lean,Mathlib/RingTheory/Finiteness.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Pi.lean,Mathlib/RingTheory/KrullDimension.lean,Mathlib/RingTheory/Noetherian.lean,Mathlib/RingTheory/SimpleModule.lean,Mathlib/Topology/KrullDimension.lean,Mathlib/Topology/Sheaves/SheafCondition/EqualizerProducts.lean	24	11	['alreadydone', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	37-44431 1 month ago	469-14444 1 year ago *	0-0 0 seconds *
4979	mhk119 author:mhk119	doc(Data/Nat/Bitblast): initial commit	Initial commit of Bitblast.lean where we prove equivalence of bitblast unsigned less than and bitblast addition. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	202/4	Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Pow.lean	3	49	['ChrisHughes24', 'digama0', 'goens', 'grunweg', 'j-loreaux', 'kim-em', 'mhk119']	nobody	37-44420 1 month ago	37-44420 1 month ago	7-68358 7 days
8536	jjaassoonn author:jjaassoonn	characteristic predicate of tensor product	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	399/7	Mathlib/Algebra/Category/AlgebraCat/Monoidal.lean,Mathlib/LinearAlgebra/IsTensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean	4	12	['alreadydone', 'eric-wieser', 'jjaassoonn']	nobody	37-44384 1 month ago	37-44384 1 month ago	0-0 0 seconds
11524	mcdoll author:mcdoll	refactor: Introduce type-class for SchwartzMap	--- There are a lot of other refactors to do (`seminormAux` should have a nicer name and gobble up more theorems from `seminorm`), then one can prove `integrable` and friends with only `SchwartzMapClass`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict WIP	139/137	Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Topology/ContinuousFunction/ZeroAtInfty.lean	3	0	[]	nobody	37-44350 1 month ago	37-44350 1 month ago	0-0 0 seconds
11003	thorimur author:thorimur	chore: migrate to `tfae` block tactic	Migrates to the `tfae` block tactic syntax, eliminating uses of `tfae_have` and `tfae_finish`. --- - [ ] depends on: #11000 - [ ] depends on: #10991 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict blocked-by-other-PR WIP	1267/1081	Mathlib/Algebra/Exact.lean,Mathlib/Algebra/Homology/ShortComplex/ExactFunctor.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/CategoryTheory/Abelian/Exact.lean,Mathlib/CategoryTheory/Bicategory/Kan/Adjunction.lean,Mathlib/FieldTheory/Galois.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/LinearAlgebra/Eigenspace/Zero.lean,Mathlib/MeasureTheory/Group/Action.lean,Mathlib/NumberTheory/FLT/Basic.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/Height.lean,Mathlib/Order/WellFoundedSet.lean,Mathlib/RingTheory/Bezout.lean,Mathlib/RingTheory/DiscreteValuationRing/TFAE.lean,Mathlib/RingTheory/Flat/EquationalCriterion.lean,Mathlib/RingTheory/Henselian.lean,Mathlib/RingTheory/LocalRing/RingHom/Basic.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/ValuationRing.lean,Mathlib/SetTheory/Ordinal/Topology.lean,Mathlib/Tactic/TFAE.lean,Mathlib/Topology/Algebra/Group/SubmonoidClosure.lean,Mathlib/Topology/Category/CompHaus/EffectiveEpi.lean,Mathlib/Topology/Category/Profinite/EffectiveEpi.lean,Mathlib/Topology/Category/Stonean/EffectiveEpi.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/LocallyClosed.lean,Mathlib/Topology/LocallyConstant/Basic.lean,Mathlib/Topology/NoetherianSpace.lean,Mathlib/Topology/Order/LeftRightNhds.lean,Mathlib/Topology/Separation.lean,Mathlib/Topology/UniformSpace/UniformConvergence.lean,scripts/noshake.json,test/tfae.lean	42	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	37-44346 1 month ago	37-44346 1 month ago	0-0 0 seconds
9819	jjaassoonn author:jjaassoonn	fg graded ring	1. if $A$ is a noetherian graded ring, then $A_0$ is a noetherian subring of $A$ and $A$ is a finitely generated algebra over $A_0$, if $M$ is a finitely generated graded module over $A$, then each $M_n$ is a finitely generated module over $A_0$. 2. Definition of additive functions over any abelian category: if $C$ is an abelian category, a function $f : C \to \mathbb Z$ is said to be additive, if $f(y) = f(x) + f(z)$ whenever $0\to x \to y \to z \to 0$ is exact. proved some basic properties such as $f(0) = 0$ and $f(x) = f(y)$ whenever $x \cong y$ and interaction of $f$ with longer exact sequences 3. The category of finitely generated module over noetherian ring is abelian 4. A proof of Hilbert-Serre theorem: the Poincare series is actually of the form $\frac{p}{\prod(1- X^i)}$ where $p$ is polynomial The code works, but poorly written. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	6745/217	Mathlib.lean,Mathlib/Algebra/Category/FGModuleCat/Abelian.lean,Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/FGModuleCat/EpiMono.lean,Mathlib/Algebra/Category/FGModuleCat/Kernels.lean,Mathlib/Algebra/Category/FGModuleCat/Limits.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/HilbertSerre/AdditiveFunction.lean,Mathlib/Algebra/HilbertSerre/FiniteInstances.lean,Mathlib/Algebra/HilbertSerre/HilbertPolynomial.lean,Mathlib/Algebra/HilbertSerre/Theorem.lean,Mathlib/Algebra/Module/GradeZeroModule.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Finiteness.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousIdeal.lean,Mathlib/RingTheory/GradedAlgebra/Noetherian.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,Mathlib/RingTheory/GradedAlgebra/Subgrading.lean,Mathlib/RingTheory/Polynomial/Hilbert.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/WellKnown.lean	25	n/a	['FMLJohn', 'github-actions']	nobody	37-44332 1 month ago	unknown	unknown
13543	adomani author:adomani	test: automatically undeprecate	A test for `update_deprecations`. There are two files with deprecated declarations, but CI automatically fixes them, so that they pass the noisy tests (as well as passing fail-on-warning `lake build`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	345/4	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/UpdateDeprecations.lean,Mathlib/test_depr.lean,Mathlib/test_depr_no_change.lean,lakefile.lean,scripts/update_deprecations.lean,test/UpdateDeprecations.lean	12	0	[]	nobody	37-44183 1 month ago	37-44183 1 month ago	0-0 0 seconds
16186	joneugster author:joneugster	chore: use emoji-variant-selector `\uFE0F` for emojis ✅️,❌️,💥️,🟡️	Append the emoji-variant selector `\uFE0F` to these 4 unicode symbols which should always be rendered as emojis. --- This has been done in core, so it makes sense to do the same in Mathlib. - [x] depends on: leanprover/lean4#5173 - [ ] depends on: #16215 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict awaiting-author blocked-by-other-PR	28/28	.github/workflows/lean4checker.yml,.github/workflows/nightly_detect_failure.yml,.github/workflows/update_dependencies_zulip.yml,scripts/lean-pr-testing-comments.sh,test/AssertExists.lean	5	3	['github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	37-44030 1 month ago	37-44030 1 month ago	7-61243 7 days
14932	eric-wieser author:eric-wieser	chore: add nndist versions of lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	108/1	Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Geometry/Euclidean/Basic.lean	2	1	['github-actions']	nobody	37-43996 1 month ago	37-43996 1 month ago	0-0 0 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.	merge-conflict	345/345	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/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,Mathlib/Data/Real/Pi/Irrational.lean	171	9	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	nobody	37-5710 1 month ago	37-5711 1 month ago	11-65652 11 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/)	t-algebra merge-conflict awaiting-author label:t-algebra$	431/218	Mathlib/Algebra/Exact.lean,Mathlib/Algebra/Module/CharacterModule.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/LinearAlgebra/Dimension/Constructions.lean,Mathlib/LinearAlgebra/Dimension/RankNullity.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/LinearAlgebra/Quotient/Pi.lean,Mathlib/LinearAlgebra/SModEq.lean,Mathlib/LinearAlgebra/Semisimple.lean,Mathlib/LinearAlgebra/TensorProduct/Quotient.lean,Mathlib/LinearAlgebra/TensorProduct/RightExactness.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Exactness.lean,Mathlib/RingTheory/AdicCompletion/Functoriality.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/Ideal/Colon.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/PowerBasis.lean,Mathlib/RingTheory/QuotSMulTop.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/TensorProduct/Quotient.lean	33	10	['Thmoas-Guan', 'alreadydone', 'erdOne', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	36-36735 1 month ago	36-36735 1 month ago	16-61571 16 days
18202	ADedecker author:ADedecker	chore: refactor algebraic filter bases	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	1086/1315	Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/Barrelled.lean,Mathlib/Analysis/LocallyConvex/WeakDual.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Operator/WeakOperatorTopology.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/Module/UniformConvergence.lean,Mathlib/Topology/Algebra/Nonarchimedean/AdicTopology.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/UniformFilterBasis.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean	14	1	['github-actions']	nobody	36-36667 1 month ago	36-36667 1 month ago	0-0 0 seconds
23546	JovanGerb author:JovanGerb	feat(LinearAlgebra/AffineSpace/AffineSubspace): rename `AffineSubspace.mk'` to `Submodule.shift`	In addition to renaming, I've refactored the code a bit: - `mem_mk'_iff_vsub_mem` was obsolete since it was the same as `mem_mk'`, so I removed it (this is due to a change in the definition I made recently) - I added a nonempty instance for `shift` - I added a simp lemma that `shift` isn't equal to `⊥` (the empty affine subspace). I need this for the next point. - Edit: I'll leave this for a later PR. ~I proved a simp lemma that a `shift` is parallel to a `shift` if and only if the linear subspaces are the same.~ - I renamed `mk'_eq` to `shift_direction_eq_self `. - I renamed `eq_or_eq_secondInter_of_mem_mk'_span_singleton_iff_mem` to `eq_or_eq_secondInter_iff_mem_of_mem_shift_span_singleton`. I think it is better to put the `of_mem_mk'_span_singleton` at the end of the name. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry merge-conflict	128/99	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Geometry/Euclidean/Basic.lean,Mathlib/Geometry/Euclidean/MongePoint.lean,Mathlib/Geometry/Euclidean/PerpBisector.lean,Mathlib/Geometry/Euclidean/Sphere/SecondInter.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean	7	4	['JovanGerb', 'github-actions', 'leanprover-community-bot-assistant']	nobody	36-19167 1 month ago	36-19168 1 month ago	26-25420 26 days
24483	Parcly-Taxel author:Parcly-Taxel	chore: delete >6 month old deprecations (2024-10)	See #24271 for the general pattern of regex used in the first (automated) commit. The date range used in this PR is `2024-10-..`.	tech debt merge-conflict	2/1182	Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/AlgebraicGeometry/Morphisms/ClosedImmersion.lean,Mathlib/AlgebraicGeometry/Morphisms/Preimmersion.lean,Mathlib/AlgebraicGeometry/Restrict.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Comp.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/LineDeriv/Basic.lean,Mathlib/Analysis/Complex/ReImTopology.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean,Mathlib/CategoryTheory/Limits/Preserves/Limits.lean,Mathlib/CategoryTheory/Sites/Canonical.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/List/Flatten.lean,Mathlib/Data/List/SplitBy.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/Defs.lean,Mathlib/Data/Nat/Factorization/PrimePow.lean,Mathlib/Data/Set/Subset.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Algebra.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/AEStronglyMeasurable.lean,Mathlib/MeasureTheory/Measure/DiracProba.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/MeasureTheory/Measure/ProbabilityMeasure.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/Order/InitialSeg.lean,Mathlib/Order/WellFounded.lean,Mathlib/Probability/Density.lean,Mathlib/RingTheory/Finiteness/Cardinality.lean,Mathlib/RingTheory/Finiteness/Ideal.lean,Mathlib/RingTheory/Jacobson/Ring.lean,Mathlib/RingTheory/Localization/Cardinality.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/Spectrum/Prime/TensorProduct.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/SetTheory/Game/Nim.lean,Mathlib/SetTheory/PGame/Algebra.lean,Mathlib/Tactic/FunProp/ContDiff.lean,Mathlib/Topology/AlexandrovDiscrete.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Constructions/DomMulAct.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Group/CompactOpen.lean,Mathlib/Topology/Algebra/Group/Quotient.lean,Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/Multilinear/Topology.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakBilin.lean,Mathlib/Topology/Algebra/Monoid.lean,Mathlib/Topology/Algebra/MulAction.lean,Mathlib/Topology/Algebra/Ring/Ideal.lean,Mathlib/Topology/Algebra/SeparationQuotient/Section.lean,Mathlib/Topology/Algebra/StarSubalgebra.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Category/Profinite/Nobeling/Induction.lean,Mathlib/Topology/Category/TopCat/EffectiveEpi.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/CompactOpen.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Compactness/Lindelof.lean,Mathlib/Topology/Compactness/LocallyCompact.lean,Mathlib/Topology/Compactness/SigmaCompact.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Connected/Clopen.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Connected/TotallyDisconnected.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Bounded/Basic.lean,Mathlib/Topology/ContinuousMap/ContinuousMapZero.lean,Mathlib/Topology/ContinuousMap/Sigma.lean,Mathlib/Topology/ContinuousMap/T0Sierpinski.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/Defs/Induced.lean	139	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	35-41124 1 month ago	35-41126 1 month ago	4-54091 4 days
23953	b-reinke author:b-reinke	feat(Data/Matroid/Tutte): define the Tutte polynomial of a matroid	This PR defines the Tutte polynomial of a matroid and shows basic properties. - [ ] depends on: #23926 - [ ] depends on #24336 - [ ] depends on: #23951 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict blocked-by-other-PR WIP	111/0	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Matroid/Tutte/Basic.lean,Mathlib/Data/Set/Image.lean	3	7	['apnelson1', 'b-reinke', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	35-19763 1 month ago	37-45416 1 month ago	0-0 0 seconds
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 merge-conflict label:t-algebra$	88/19	Mathlib.lean,Mathlib/RingTheory/Valuation/Extension.lean,Mathlib/RingTheory/Valuation/Integers.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean	4	19	['github-actions', 'jjdishere', 'leanprover-community-bot-assistant', 'mariainesdff', 'mathlib4-dependent-issues-bot']	nobody	35-18628 1 month ago	35-18629 1 month ago	0-1121 18 minutes
21853	smmercuri author:smmercuri	feat: the adele ring of a number field is locally compact	--- - [ ] depends on: #21158 - [ ] depends on: #21847 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-number-theory merge-conflict 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	35-9767 1 month ago	37-45168 1 month ago	0-0 0 seconds
15654	TpmKranz author:TpmKranz	feat(Computability): language-preserving maps between NFA and RE	Map REs to NFAs via Thompson's construction and NFAs to REs using GNFAs Last chunk of #12648 --- - [ ] depends on: #15651 - [ ] depends on: #15649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict blocked-by-other-PR	985/2	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Data/FinEnum/Option.lean,docs/references.bib	7	3	['github-actions', 'leanprover-community-mathlib4-bot', 'meithecatte']	nobody	34-77865 1 month ago	34-77870 1 month ago	0-179 2 minutes
19315	quangvdao author:quangvdao	feat(Data/Finsupp/Fin): Add `Finsupp` operations on `Fin` tuple	This PR adds more analogues of operations on `Fin` tuples to the `Finsupp` setting. Before, there were only `Finsupp.cons` and `Finsupp.tail`. Now there are also `Finsupp.snoc`, `Finsupp.insertNth`, `Finsupp.init`, and `Finsupp.removeNth`. These all come with supporting lemmas. I also removed the porting comment about `succAboveCases` in `Data/Fin/Basic`, and added a lemma about `succAbove` in `Data/Fin/Tuple/Basic`. --- - [x] depends on: #20361 - [x] depends on: #20771 - [x] depends on: #20770 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict awaiting-author	193/16	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Data/Finsupp/Fin.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,scripts/nolints_prime_decls.txt	6	44	['YaelDillies', 'github-actions', 'j-loreaux', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'quangvdao']	nobody	33-79826 1 month ago	33-79826 1 month ago	43-81255 43 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	13	['YaelDillies', 'github-actions', 'grunweg', 'vihdzp']	nobody	33-79798 1 month ago	80-58425 2 months ago	36-50134 36 days
19464	adomani author:adomani	test: removed merge-conflict	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict delegated WIP	22/1	.github/workflows/PR_summary.yml,scripts/zulip_emoji_merge_delegate.py	2	10	['adomani', 'github-actions', 'leanprover-community-bot-assistant']	nobody	33-4750 1 month ago	33-4752 1 month ago	0-0 0 seconds
7907	urkud author:urkud	feat: introduce `NthRoot` notation class	Also use it for `Real.sqrt`, and replace the few occurrences of `sqrt` that do not already use the notation. --- [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/.60Sqrt.60.20notation.20typeclass/near/400086502) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis awaiting-CI merge-conflict label:t-algebra$	193/156	Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1960Q2.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Mathlib.lean,Mathlib/Algebra/NthRoot.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Asymptotics.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Data/Real/GoldenRatio.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/ConvexBody.lean,Mathlib/NumberTheory/NumberField/ClassNumber.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/Probability/Distributions/Gaussian.lean,MathlibTest/positivity.lean	28	9	['eric-wieser', 'github-actions', 'kmill', 'urkud']	nobody	32-20540 1 month ago	286-34098 9 months ago	0-0 0 seconds
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	225/12	Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Topology/Algebra/Module/Basic.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	31-80975 1 month ago	unknown	unknown
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 merge-conflict blocked-by-other-PR WIP	967/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MSplits.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	31-75190 1 month ago	31-78717 1 month ago	0-0 0 seconds
24550	grunweg author:grunweg	feat: define `SliceModel` typeclass for models with corners for embedded submanifolds	Still work in progress: TODO write a proper module doc-string and commit message. --- - [ ] depends on: #23040 (at least morally) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	1214/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MSplits.lean,Mathlib/Geometry/Manifold/SliceModel.lean	6	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	31-75128 1 month ago	31-75560 1 month ago	0-0 0 seconds
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	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	31-13249 1 month ago	31-13252 1 month ago	0-562 9 minutes
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	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	31-13200 1 month ago	31-13202 1 month ago	0-344 5 minutes
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	30-84574 30 days ago	206-40835 6 months ago	0-602 10 minutes
24248	urkud author:urkud	feat(HaarToSphere): add integrability lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict	99/6	Mathlib/MeasureTheory/Constructions/HaarToSphere.lean,Mathlib/MeasureTheory/Integral/Prod.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	29-45005 29 days ago	29-45007 29 days ago	0-0 0 seconds
24523	dagurtomas author:dagurtomas	feat(Condensed): closed symmetric monoidal structure on light condensed modules	--- - [ ] depends on: #24485 - [ ] depends on: #24490 - [ ] depends on: #24522 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-condensed merge-conflict blocked-by-other-PR WIP	473/2	Mathlib.lean,Mathlib/CategoryTheory/Localization/Monoidal/Basic.lean,Mathlib/CategoryTheory/Localization/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Braided/Transport.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean,Mathlib/Condensed/Light/Monoidal.lean,Mathlib/Condensed/Light/Small.lean	8	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	29-31270 29 days ago	29-31271 29 days ago	0-133 2 minutes
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/)	t-analysis merge-conflict	704/33	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/CompMul.lean,Mathlib/Analysis/Calculus/Deriv/Shift.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/Gradient/Basic.lean,Mathlib/Analysis/Calculus/Poincare/OneForm.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/MeasureTheory/Integral/DivergenceTheorem.lean,Mathlib/MeasureTheory/Integral/PathIntegral/Basic.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/UnitInterval.lean	16	4	['github-actions', 'leanprover-community-bot-assistant']	nobody	29-4114 29 days ago	29-4116 29 days ago	0-0 0 seconds
24477	mariainesdff author:mariainesdff	feat(RingTheory/Ideal/Span): subideals form a complete lattice	Co-authored-by: @AntoineChambert-Loir --- [![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$	33/0	Mathlib/RingTheory/Ideal/Span.lean	1	8	['alreadydone', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mariainesdff']	nobody	28-83301 28 days ago	28-83301 28 days ago	9-2345 9 days
24642	grunweg author:grunweg	WIP-feat: add layercake formula for ENNReal-valued functions	Not much to see here yet; some significant amount of work remains. --- - [ ] depends on: #24643 - [ ] depends on: #24640 (based on that PR for simplicity) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson t-analysis merge-conflict WIP	189/24	Mathlib/Analysis/SpecialFunctions/Pow/Integral.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Integral/Layercake.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	28-13425 28 days ago	28-13428 28 days ago	0-0 0 seconds
21712	grunweg author:grunweg	chore: generalise more lemmas to `ContinuousENorm`	--- - [x] depends on: #21781 (minor drive-by clean-up) - [x] depends on: #21670 - [x] depends on: #22708 (extracted from this) - some parts depend on #21433 (or better: #22175); when the dependent PR has landed, I will re-assess whether to split these into a separate PR [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson t-measure-probability awaiting-CI merge-conflict	76/31	Mathlib/Analysis/Normed/MulAction.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/ContinuousFunctions.lean	4	5	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	27-35109 27 days ago	37-45143 1 month ago	0-0 0 seconds
21375	grunweg author:grunweg	WIP: generalise lemmas to ENorm	This work is part of (and a necessary pre-requisite for) the Carleson project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson t-measure-probability awaiting-CI merge-conflict WIP	471/221	Mathlib/Analysis/NormedSpace/IndicatorFunction.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/ChebyshevMarkov.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Trim.lean,Mathlib/MeasureTheory/Function/LpSpace.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/Probability/Independence/Integrable.lean	13	2	['fpvandoorn', 'grunweg']	nobody	27-29484 27 days ago	37-45138 1 month ago	0-0 0 seconds
24378	urkud author:urkud	feat(Algebra/Order/Field/Basic): generalize lemmas	... from linear ordered semifields to (commutative) groups with zero. --- I'm going to do another round of generalizing today or tomorrow, so making it a draft PR for now. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	183/181	Archive/OxfordInvariants/Summer2021/Week3P1.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/CStarAlgebra/ApproximateUnit.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/BumpFunction/InnerProduct.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Convex/SpecificFunctions/Basic.lean,Mathlib/Analysis/Convex/SpecificFunctions/Pow.lean,Mathlib/Analysis/Convex/StrictConvexSpace.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/Convex/Visible.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Normed/Field/Lemmas.lean,Mathlib/Analysis/Normed/Field/Ultra.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/Analysis/NormedSpace/HomeomorphBall.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean,Mathlib/Analysis/NormedSpace/Pointwise.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSqIntegral.lean,Mathlib/Analysis/SpecialFunctions/SmoothTransition.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Combinatorics/Schnirelmann.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Data/Nat/Cast/Order/Field.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Real/Cardinality.lean,Mathlib/Data/Real/Pi/Wallis.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/RightAngle.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/PeakFunction.lean,Mathlib/MeasureTheory/Measure/SeparableMeasure.lean,Mathlib/NumberTheory/Bertrand.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleAbs.lean,Mathlib/NumberTheory/DiophantineApproximation/Basic.lean,Mathlib/NumberTheory/LSeries/Injectivity.lean,Mathlib/NumberTheory/LSeries/ZMod.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/MahlerBasis.lean,Mathlib/NumberTheory/Pell.lean,Mathlib/NumberTheory/Transcendental/Liouville/LiouvilleNumber.lean,Mathlib/Order/Filter/AtTopBot/Floor.lean,Mathlib/Order/Interval/Set/IsoIoo.lean,Mathlib/Probability/StrongLaw.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/Topology/ContinuousMap/Polynomial.lean,Mathlib/Topology/Instances/AddCircle.lean,Mathlib/Topology/UrysohnsLemma.lean	72	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	27-13814 27 days ago	27-13816 27 days ago	0-0 0 seconds
21847	smmercuri author:smmercuri	feat: `v.adicCompletionIntegers K` is compact	--- - [ ] depends on: #21844 - [ ] depends on: #24872 [![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 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	26-47640 26 days ago	37-45159 1 month ago	0-0 0 seconds
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 merge-conflict	186/0	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Restricted.lean	2	18	['Paul-Lez', 'WilliamCoram', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	26-33783 26 days ago	26-33785 26 days ago	48-76736 48 days
24853	smmercuri author:smmercuri	feat: dimensions of completions at infinite place extensions	Let `L / K` be an extension of number fields. For a fixed `v : InfinitePlace K`, we consider the infinite places `w` of `L` that extend `v`. The main results of this PR are: - `InfinitePlace.sum_ramificationIdx_eq`: the sum over all `w` extending `v` of the ramification indices of `w` over `K` is `[K : L]`. - `InfinitePlace.finrank_eq_ramificationIdx`: the `v.Completion`-dimension of `w.Completion` equals the ramification index of `w` over `K`. --- - [ ] depends on: #24870 - [ ] depends on: #24872 - [ ] depends on: #24873 - [ ] depends on: #24875 - [ ] depends on: #24877 - [x] depends on: #24879 - [ ] depends on: #24881 - [ ] depends on: #24882 - [ ] depends on: #24884 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import FLT merge-conflict blocked-by-other-PR	918/1	Mathlib.lean,Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/Data/Subtype.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Dimension.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean,Mathlib/Topology/Algebra/UniformRing.lean	8	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	26-16899 26 days ago	26-16901 26 days ago	0-1 1 second
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 - [ ] depends on: #24309 - [ ] depends on: #24275 - [ ] depends on: #24191 - [ ] depends on: #23797 - [ ] depends on: #22586 - [ ] depends on: #22556 - [ ] depends on: #22547 - [ ] depends on: #22539 - [ ] depends on: #22508 - [ ] depends on: #22450 - [ ] depends on: #23915 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology t-category-theory merge-conflict blocked-by-other-PR WIP	41980/508	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Free.lean,Mathlib/Algebra/Category/ModuleCat/LeftResolutions.lean,Mathlib/Algebra/Homology/Additive.lean,Mathlib/Algebra/Homology/BicomplexColumns.lean,Mathlib/Algebra/Homology/BicomplexRows.lean,Mathlib/Algebra/Homology/Bifunctor.lean,Mathlib/Algebra/Homology/BifunctorColimits.lean,Mathlib/Algebra/Homology/BifunctorCommShift.lean,Mathlib/Algebra/Homology/BifunctorFlip.lean,Mathlib/Algebra/Homology/BifunctorHomotopy.lean,Mathlib/Algebra/Homology/BifunctorMappingCone.lean,Mathlib/Algebra/Homology/BifunctorShift.lean,Mathlib/Algebra/Homology/BifunctorSingle.lean,Mathlib/Algebra/Homology/BifunctorTriangulated.lean,Mathlib/Algebra/Homology/CategoryWithHomology.lean,Mathlib/Algebra/Homology/CochainComplexMinus.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/ComplexShapeSigns.lean,Mathlib/Algebra/Homology/ConnectShortExact.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/DerivabilityStructureInjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Fractions.lean,Mathlib/Algebra/Homology/DerivedCategory/FullyFaithful.lean,Mathlib/Algebra/Homology/DerivedCategory/HomologySequence.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Minus.lean,Mathlib/Algebra/Homology/DerivedCategory/Monoidal.lean,Mathlib/Algebra/Homology/DerivedCategory/Plus.lean,Mathlib/Algebra/Homology/DerivedCategory/RightDerivedFunctorPlus.lean,Mathlib/Algebra/Homology/DerivedCategory/SingleTriangle.lean,Mathlib/Algebra/Homology/DerivedCategory/SpectralObject.lean,Mathlib/Algebra/Homology/DerivedCategory/TStructure.lean,Mathlib/Algebra/Homology/Double.lean,Mathlib/Algebra/Homology/DoubleHomology.lean,Mathlib/Algebra/Homology/Embedding/Boundary.lean,Mathlib/Algebra/Homology/Embedding/CochainComplex.lean,Mathlib/Algebra/Homology/Embedding/CochainComplexTrunc.lean,Mathlib/Algebra/Homology/Embedding/ComplementaryTrunc.lean,Mathlib/Algebra/Homology/Embedding/ExtendMap.lean,Mathlib/Algebra/Homology/Embedding/HomEquiv.lean,Mathlib/Algebra/Homology/Embedding/StupidFiltration.lean,Mathlib/Algebra/Homology/Embedding/StupidTrunc.lean,Mathlib/Algebra/Homology/Embedding/TruncGE.lean,Mathlib/Algebra/Homology/Embedding/TruncLE.lean,Mathlib/Algebra/Homology/Embedding/TruncLEHomology.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Homology/ExactSequenceFour.lean,Mathlib/Algebra/Homology/Factorizations/Basic.lean,Mathlib/Algebra/Homology/Factorizations/CM5a.lean,Mathlib/Algebra/Homology/Factorizations/CM5b.lean,Mathlib/Algebra/Homology/HomologicalBicomplex.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/HomologicalComplexFunctorEquiv.lean,Mathlib/Algebra/Homology/HomologicalComplexLimits.lean,Mathlib/Algebra/Homology/HomologicalComplexLimitsEventuallyConstant.lean,Mathlib/Algebra/Homology/Homology.lean,Mathlib/Algebra/Homology/HomologySequence.lean,Mathlib/Algebra/Homology/HomologySequenceLemmas.lean,Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Algebra/Homology/HomotopyCategory.lean,Mathlib/Algebra/Homology/HomotopyCategory/Cylinder.lean,Mathlib/Algebra/Homology/HomotopyCategory/DegreewiseSplit.lean,Mathlib/Algebra/Homology/HomotopyCategory/Devissage.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexShift.lean,Mathlib/Algebra/Homology/HomotopyCategory/KInjective.lean,Mathlib/Algebra/Homology/HomotopyCategory/MappingCone.lean,Mathlib/Algebra/Homology/HomotopyCategory/Minus.lean,Mathlib/Algebra/Homology/HomotopyCategory/Monoidal.lean,Mathlib/Algebra/Homology/HomotopyCategory/MonoidalTriangulated.lean,Mathlib/Algebra/Homology/HomotopyCategory/Plus.lean,Mathlib/Algebra/Homology/HomotopyCategory/PreservesQuasiIso.lean,Mathlib/Algebra/Homology/HomotopyCategory/Pretriangulated.lean,Mathlib/Algebra/Homology/HomotopyCategory/Shift.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShiftSequence.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomotopyCategory/SingleFunctors.lean,Mathlib/Algebra/Homology/HomotopyCategory/SpectralObject.lean,Mathlib/Algebra/Homology/HomotopyFiber.lean,Mathlib/Algebra/Homology/LeftResolutions/Basic.lean,Mathlib/Algebra/Homology/LeftResolutions/CochainComplex.lean,Mathlib/Algebra/Homology/LeftResolutions/CochainComplexMinus.lean,Mathlib/Algebra/Homology/LeftResolutions/Reduced.lean,Mathlib/Algebra/Homology/LeftResolutions/Transport.lean,Mathlib/Algebra/Homology/Localization.lean,Mathlib/Algebra/Homology/Monoidal.lean,Mathlib/Algebra/Homology/ObjectProperty.lean,Mathlib/Algebra/Homology/PreservesQuasiIso.lean,Mathlib/Algebra/Homology/QuasiIso.lean,Mathlib/Algebra/Homology/Refinements.lean,Mathlib/Algebra/Homology/ShortComplex/Abelian.lean,Mathlib/Algebra/Homology/ShortComplex/Basic.lean,Mathlib/Algebra/Homology/ShortComplex/Exact.lean,Mathlib/Algebra/Homology/ShortComplex/FiveLemma.lean,Mathlib/Algebra/Homology/ShortComplex/FourLemma.lean,Mathlib/Algebra/Homology/ShortComplex/HomologicalComplex.lean,Mathlib/Algebra/Homology/ShortComplex/Images.lean,Mathlib/Algebra/Homology/ShortComplex/Preadditive.lean	299	n/a	['digama0', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	25-85079 25 days ago	unknown	unknown
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 merge-conflict awaiting-author	244/0	Mathlib.lean,Mathlib/Combinatorics/Flow/Basic.lean,docs/references.bib	3	57	['Shreyas4991', 'YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak', 'niklasmohrin']	nobody	25-70063 25 days ago	25-70065 25 days ago	86-21072 86 days
24208	ADedecker author:ADedecker	chore: semilinearize LinearAlgebra.TensorProduct.Basic	This was painful, and it's not without consequences, but this is necessary in order to talk about tensor products of Hilbert spaces. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	191/138	Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/LinearAlgebra/BilinearForm/TensorProduct.lean,Mathlib/LinearAlgebra/BilinearMap.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Associator.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/Coalgebra/Hom.lean	12	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	25-56110 25 days ago	25-56111 25 days ago	0-25 25 seconds
15115	kkytola author:kkytola	feat: Generalize assumptions in liminf and limsup results in ENNReals	In a [review comment](https://github.com/leanprover-community/mathlib4/pull/13938#discussion_r1649744441) it was pointed out that results about liminf and limsup in ENNReal hold under milder assumptions. This PR does the generalization. --- This PR is split off from #13938, where the review comment was made. The changes needed for the suggested generalization were of different kind than the simple PR's content, justifying a separate PR. - [x] depends on: #13938 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-topology merge-conflict awaiting-author help-wanted	215/27	Mathlib/MeasureTheory/Measure/Portmanteau.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Topology/Instances/ENNReal.lean	3	8	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'j-loreaux', 'kkytola', 'leanprover-community-mathlib4-bot']	nobody	25-25819 25 days ago	50-10123 1 month ago	21-25493 21 days
21603	imbrem author:imbrem	feat(CategoryTheory/ChosenFiniteProducts): add 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 merge-conflict awaiting-author	261/2	Mathlib/CategoryTheory/ChosenFiniteProducts.lean	1	17	['TwoFX', 'YaelDillies', 'github-actions', 'grunweg', 'imbrem', 'joelriou', 'leanprover-community-bot-assistant']	TwoFX and joelriou assignee:TwoFX assignee:joelriou	25-2480 25 days ago	25-2662 25 days ago	89-21170 89 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 merge-conflict 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	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	24-45371 24 days ago	24-45374 24 days ago	20-75471 20 days
17129	joneugster author:joneugster	feat(Tactic/Linter): add unicode linter for unicode variant-selectors	Unicode characters can be followed by one of the two "variant-selectors" `\FE0E` (text) or `\FE0F` (emoji). These appear to the user as a single unicode character and they might copy them by accident. For example `✅️` (`\u2705\uFE0F`), `✅` (`\u2705`) and `✅︎` (`\u2705\uFE0E`) are three variants of the "same" unicode character. The one without variant-selector might display as either emoji or not, depending on the user's device and font. Add unicode linter ensuring variant-selector only appear on specified characters and also ensuring these characters always have the correct variant selector to avoid confusions. Everything flagged by this linter can be fixed fully automatically with `lake exe lint-style --fix` or by commenting `bot fix style` on the PR. --- - tracking PR: #16215 ## Zulip discussions: - https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F - https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Lean.20specific.20font ## Related PRs: - leanprover/lean4#5015 added some emoji-variant selectors to Emojis used in `Lean` itself. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict delegated awaiting-author	245/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnicodeLinter.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CongrM.lean,Mathlib/Tactic/Widget/Conv.lean,Mathlib/Tactic/Widget/GCongr.lean,Mathlib/Topology/ContinuousMap/Weierstrass.lean,MathlibTest/LintStyleTextBased.lean	11	25	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant']	nobody	24-14325 24 days ago	24-14327 24 days ago	82-54712 82 days
17131	joneugster author:joneugster	feat(Tactic/Linter): add unicode linter for unwanted characters	Add unicode linter flagging bad unicode characters. In this first form, the linter only flags `\u00A0` (non-breaking space) and replaces it with a normal space. Non-breaking space has been chosen because they keep reappearing in mathlib and it seems to be uncontroversial to lint for these. The whitelist/blacklist could then be refined in future PRs. Everything flagged by this linter can be fixed fully automatically with `lake exe lint-style --fix` or by commenting `bot fix style` on the PR. --- - tracking PR: #16215 ## Zulip discussions: - https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F - https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Lean.20specific.20font [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict awaiting-author	112/8	Mathlib.lean,Mathlib/Algebra/Lie/Semisimple/Lemmas.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/CategoryTheory/Category/ReflQuiv.lean,Mathlib/LinearAlgebra/Vandermonde.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnicodeLinter.lean	8	6	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	adomani and grunweg assignee:grunweg assignee:adomani	24-14324 24 days ago	24-14326 24 days ago	52-18594 52 days
8495	jjaassoonn author:jjaassoonn	feat : Tensor-Hom adjunction in the category of modules	# Tensor-Hom adjunction Let $R$ be a commutative ring and $S$ any ring. Let $X$ be an $(S,R)$-bimoule. Then the tensor functor $(X \otimes_R \cdot)$ is a functor from left $R$-modules to left $S$-modules; and the hom-functor $Hom_S(X, \cdot)$ is a functor from left $S$-modules to left $R$-modules. For another left $S$-module $Y$, the left $R$-module structure of $Hom_S(X, Y)$ is given by $s \cdot f := x \mapsto f(s \cdot x)$. These two functors are adjoint.. In particular we have that ```math {\rm Hom}_{S}(X\otimes_R Y, Z) \cong {\rm Hom}_R (Y, {\rm Hom}_S (X, Z)) ``` ## Implementation notes 1. Why not use the `Mathlib/LinearAlgebra/TensorProduct/Tower.lean` In our setting `X` is an `(R, S)` bimodule and `Y` an `R`-module and `Z` an `S`-module so to use the `Tower` file, we need `S` to be an `R`-algebra which is a luxury we do not have. But note that in `Tower` file, `curry` and `uncurry` are both tri-linear maps. So `Tower` file allows interplay of 3 rings which is not allowed in this file. 2. We require `R` to be commutative but we never used anything commutative. This is because of tensor product requires commutativity, but thanks to @alreadydone, this assumption could be removed soon. I think this PR should wait for Junyan's attempt on removing commutativity, so it is marked as draft and wip for now --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author WIP label:t-algebra$	214/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/TensorHomAdjunction.lean	2	88	['alreadydone', 'bustercopley', 'eric-wieser', 'github-actions', 'jjaassoonn', 'kbuzzard', 'kim-em', 'leanprover-community-bot-assistant']	eric-wieser assignee:eric-wieser	23-20355 23 days ago	23-20356 23 days ago	0-0 0 seconds
24590	smmercuri author:smmercuri	chore: make `Valuation.Completion` a `def` and refactor more of `AdicValuation.lean`	The main purpose of this PR is to resolve timeout issues encountered in FLT following the refactor of `HeightOneSpectrum.adicCompletion` to use the `WithVal` type synonym. The proposed fix in this PR is to replace `abbrev` with `def` in `Valuation.Completion`. Tested in FLT and this removes the timeout issue. Also refactor as much API as possible from `HeightOneSpectrum.adicCompletion` to `Valuation.Completion`. See #22488 for a previous attempt at fixing the problem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT merge-conflict	162/81	Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	5	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'smmercuri']	nobody	22-78761 22 days ago	22-78763 22 days ago	13-35725 13 days
19284	adomani author:adomani	test: commit a change only to the "master" CI build action	This PR should fail CI, since the main CI build file is incompatible with the autogenerated ones. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict awaiting-author	3/3	.github/build.in.yml,.github/workflows/actionlint.yml	2	12	['adomani', 'bryangingechen', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant']	bryangingechen assignee:bryangingechen	21-51759 21 days ago	21-51760 21 days ago	0-0 0 seconds
15651	TpmKranz author:TpmKranz	feat(Computability/NFA): operations for Thompson's construction	Lays the groundwork for a proof of equivalence of RE and NFA, w.r.t. described language. Actual connection to REs comes later, after the groundwork for the opposite direction has been laid. Third chunk of #12648 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	307/5	Mathlib/Computability/NFA.lean	1	15	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte']	nobody	21-14071 21 days ago	21-14072 21 days ago	45-84611 45 days
22361	rudynicolop author:rudynicolop	feat(Computability/NFA): nfa closure properties	Add the closure properties union, intersection and reversal for NFA. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	218/2	Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean	2	90	['EtienneC30', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	EtienneC30 assignee:EtienneC30	21-13145 21 days ago	21-13147 21 days ago	39-67601 39 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 merge-conflict 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	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	20-42508 20 days ago	20-42510 20 days ago	0-0 0 seconds
23281	mattrobball author:mattrobball	test		merge-conflict	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	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	20-39889 20 days ago	20-39891 20 days ago	0-0 0 seconds
24245	JovanGerb author:JovanGerb	feat(Geometry/Euclidean/SignedDist): `signedDist` between two points	This PR defines `signedDist`, the signed distance between two points. It redefines `signedInfDist` so that it uses `signedDist`. The motivation is to use this in IMO2020Q6. Additionally this definition will be useful for properly reasoning about the power of a point [#mathlib4 > Signed distance between points](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Signed.20distance.20between.20points) some comments: * should `signedDistLinear` be `private`? * should `signedDist` and `signedInfDist` be made continuous bunled maps in this PR? * I'm not too happy about the hypothesis in `signedDist_congr (h : ∃ r > (0 : ℝ), r • v = w)`. This relationship between `v` and `w` is a symmetric one that should have some API around it, similar to `SameRay`. It could also be spelled as `(ℝ≥0 ∙ v) = ℝ≥0 ∙ w` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry merge-conflict	206/23	Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Geometry/Euclidean/SignedDist.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean	3	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	18-84326 18 days ago	18-84328 18 days ago	30-61949 30 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. I will split it 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. - [ ] depends on: #22531 - [ ] depends on: #23790 - [x] depends on: #23748 - [ ] depends on: #23749 - [ ] depends on: #22538 - [ ] depends on: #23831 - [ ] depends on: #22531 - [x] depends on: #20071 - [ ] depends on: #20160 - [ ] depends on: #20241 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict blocked-by-other-PR WIP	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	55	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	18-12138 18 days ago	32-22636 1 month ago	0-0 0 seconds
15254	yuma-mizuno author:yuma-mizuno	feat(CategoryTheory/Monoidal): replace `Mon_` lemmas with `Mon_Class` lemmas	We redefine algebras internal to monoidal categories, which were defined by full-bundled structures, in terms of semi-bundled type classes. The original full-bundled structure `X` is renamed to `X_Cat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	3982/96	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Bimod_Class.lean,Mathlib/CategoryTheory/Monoidal/Bimon_.lean,Mathlib/CategoryTheory/Monoidal/Bimon_Class copy.lean,Mathlib/CategoryTheory/Monoidal/Bimon_Class.lean,Mathlib/CategoryTheory/Monoidal/Braided/Opposite.lean,Mathlib/CategoryTheory/Monoidal/CommMon_Class.lean,Mathlib/CategoryTheory/Monoidal/Comon_.lean,Mathlib/CategoryTheory/Monoidal/Comon_Class.lean,Mathlib/CategoryTheory/Monoidal/Internal/ModuleClass.lean,Mathlib/CategoryTheory/Monoidal/Mod_Class.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Mon_Class.lean,Mathlib/CategoryTheory/Monoidal/mwe.lean	14	n/a	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'yuma-mizuno']	nobody	17-77330 17 days ago	unknown	unknown
25006	jano-wol author:jano-wol	feat: invariant dual submodules define Lie ideals	Invariant dual submodules define Lie ideals --- PR shows that Invariant dual submodules define Lie ideals. This work is part of the framework: https://github.com/orgs/leanprover-community/projects/17 This is a preparatory PR for [#24849](https://github.com/leanprover-community/mathlib4/pull/24849) [![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$	214/0	Mathlib/Algebra/Lie/Weights/RootSystem.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'ocfnash']	nobody	17-38419 17 days ago	20-83831 20 days ago	1-1321 1 day
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 merge-conflict awaiting-author WIP label:t-algebra$	1247/83	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/Functoriality.lean,Mathlib/RepresentationTheory/GroupCohomology/LongExactSequence.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/GroupCohomology/ToMove.lean	10	6	['github-actions', 'joelriou', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	17-30220 17 days ago	17-30221 17 days ago	15-42431 15 days
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 merge-conflict blocked-by-other-PR label:t-algebra$	554/91	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/Functoriality.lean,Mathlib/RepresentationTheory/GroupCohomology/LongExactSequence.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean	10	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	17-30218 17 days ago	17-30220 17 days ago	0-309 5 minutes
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 merge-conflict 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	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	16-65045 16 days ago	16-65046 16 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 merge-conflict 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	6	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	16-65044 16 days ago	16-65046 16 days ago	0-298 4 minutes
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 merge-conflict 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	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	16-64920 16 days ago	16-64922 16 days ago	0-0 0 seconds
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 merge-conflict 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	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	16-64919 16 days ago	16-64921 16 days ago	0-18 18 seconds
25057	mattrobball author:mattrobball	test		merge-conflict	23/12	Mathlib/Data/Finsupp/Defs.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/MvPowerSeries/Basic.lean	3	7	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	16-57280 16 days ago	16-57282 16 days ago	0-0 0 seconds
22073	vasnesterov author:vasnesterov	feat(Tactic/Order): frontend for `order`	* Support `order [h1, h2]` and `order only [h1, h2]` syntax. * Split conjunctions while extracting facts from the context. E.g. hypotheses in the form `A ∧ B` are converted into two facts `A` and `B`. * Similarly, extract facts from existential quantifiers in the hypotheses. --- - [ ] 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	16-28334 16 days ago	105-61166 3 months ago	0-32 32 seconds
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. * Prove `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	512/1	Mathlib/Data/Seq/Seq.lean	1	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	15-24552 15 days ago	15-24554 15 days ago	0-215 3 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 merge-conflict awaiting-author label:t-algebra$	39/28	Mathlib/Algebra/Group/Even.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Operations.lean	3	26	['YaelDillies', 'alreadydone', 'artie2000', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	15-24430 15 days ago	15-24431 15 days ago	0-3431 57 minutes
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 help-wanted label:t-algebra$	4/0	Mathlib/Algebra/MvPolynomial/Basic.lean	1	4	['BoltonBailey', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	15-22933 15 days ago	15-22935 15 days ago	0-0 0 seconds
22837	joneugster author:joneugster	feat(Data/Set/Basic): add subset_iff and not_mem_subset_iff	Add `Set.subset_iff` for consistent API with `Finset.subset_iff`. Add `Set.not_mem_subset_iff` and `Finset.not_mem_subset_iff`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-data merge-conflict	9/0	Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Set/Basic.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant']	nobody	15-22167 15 days ago	15-22169 15 days ago	30-35190 30 days
23489	plp127 author:plp127	chore: fix recursors	Replace motive with `motive` and other improvements. Will probably split this PR after fixing is done. 4013 recursors left --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	4255/172	Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Lie/BaseChange.lean,Mathlib/Algebra/Lie/IdealOperations.lean,Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/SubboxInduction.lean,Mathlib/CategoryTheory/Quotient.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/BubbleSortInduction.lean,Mathlib/Data/Fin/Tuple/NatAntidiagonal.lean,Mathlib/Data/FinEnum/Option.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/Fintype/CardEmbedding.lean,Mathlib/Data/Fintype/Option.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Nat/BinaryRec.lean,Mathlib/Data/PFun.lean,Mathlib/Data/PFunctor/Multivariate/W.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Coprod/Basic.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaEven.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaOdd.lean,Mathlib/Order/DirectedInverseSystem.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/SetTheory/Cardinal/Defs.lean,Mathlib/SetTheory/PGame/Algebra.lean,done.csv,print.lean,working.csv	42	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	15-21648 15 days ago	15-21649 15 days ago	0-0 0 seconds
24096	plp127 author:plp127	feat(Topology): Completely Regular Space iff Uniformizable	Proves that `CompletelyRegularSpace`s are uniformizable and that `UniformSpace`s are completely regular. --- - [x] depends on: #24179 - [ ] depends on: #24173 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict blocked-by-other-PR	374/31	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	9	['alreadydone', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'plp127']	nobody	15-21524 15 days ago	15-21526 15 days ago	2-6687 2 days
24100	eric-wieser author:eric-wieser	feat: restore some explicit binders from Lean 3	Part of #24099 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt merge-conflict awaiting-author	39/42	Mathlib/Data/FinEnum.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Compactness/CompactlyGeneratedSpace.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/Metrizable/CompletelyMetrizable.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	10	3	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	15-21523 15 days ago	15-21525 15 days ago	34-33204 34 days
25143	chrisflav author:chrisflav	feat(RingTheory): smooth algebras have smooth Noetherian models	Co-authored by: Judith Ludwig --- - [ ] depends on: #24794 - [ ] depends on: #25138 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	596/45	Mathlib.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/RingTheory/AlgebraicIndependent/Transcendental.lean,Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/Kaehler.lean,Mathlib/RingTheory/Smooth/NoetherianDescent.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/RingTheory/Unramified/Basic.lean	21	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	15-21147 15 days ago	15-21149 15 days ago	0-713 11 minutes
21476	grunweg author:grunweg	feat(lint-style): enable running on downstream projects	Enable lint-style to run on downstream projects, by making the following modifications: - allow passing an explicit list of libraries to lint: if nothing is passed, it lints `Mathlib`, `Archive` and `Counterexamples` (as before); otherwise, it lints precisely the passed modules - only check init imports, undocumented scripts and the errors from `lint-style.py` when linting Mathlib - make the style exceptions file configurable and optional: using the `nolints-file` flag, the exceptions file can be configured. If the flag is omitted, we try to find a file at `scripts/nolints-style.txt` --- and otherwise proceed with no style exceptions. This means mathlib can continue unchanged, and downstream projects can either add an explicit exceptions file, or proceed without any exceptions. After this PR, one should be able to run lint-style on a downstream project by `lake exe lint-style ProjectName`. Prompted by [this zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/lint-style.20for.20downstream.20libraries). --- - [ ] depends on: #24570 - [ ] depends on: #24953 (I did not test the last part.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	58/19	Mathlib/Tactic/Linter/TextBased.lean,scripts/lint-style.lean	2	19	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	joneugster assignee:joneugster	14-27655 14 days ago	14-27658 14 days ago	43-17409 43 days
24163	urkud author:urkud	refactor(TangentCone): redefine for TVS	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	421/284	Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Topology/Algebra/ConstMulAction.lean	3	4	['github-actions', 'leanprover-community-bot-assistant']	nobody	13-59372 13 days ago	13-59373 13 days ago	0-0 0 seconds
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 merge-conflict blocked-by-other-PR WIP	599/10	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	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	13-46953 13 days ago	28-83619 28 days ago	0-0 0 seconds
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 merge-conflict 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	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	13-46915 13 days ago	42-40479 1 month ago	0-0 0 seconds
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	487/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/FiveWheelLike.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	13-34776 13 days ago	13-34778 13 days ago	0-0 0 seconds
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$	166/3	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	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	13-32888 13 days ago	13-32889 13 days ago	0-879 14 minutes
23349	BGuillemet author:BGuillemet	feat: add LocallyLipschitzOn.lipschitzOnWith_of_isCompact and two small lemmas about Lipschitz functions	Main feat (in Mathlib/Topology/EMetricSpace/Basic.lean): if a function `f` from an extended pseudometric space to a pseudometric space is locally Lipschitz on a compact subset `s`, then `f` is Lipschitz on `s`. The theorem is true only when the codomain of `f` is a pseudometric space, so it needs imports from Mathlib/Topology/MetricSpace. Other small feat (in Mathlib/Analysis/Calculus/ContDiff/RCLike.lean): a function that is continuously differentiable on an open subset is locally Lipschitz on this subset. --- - [ ] depends on: #22890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-topology merge-conflict	59/4	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	PatrickMassot assignee:PatrickMassot	13-9385 13 days ago	13-9387 13 days ago	35-30364 35 days
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	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	12-77352 12 days ago	12-77354 12 days 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 merge-conflict blocked-by-other-PR	631/0	Mathlib.lean,Mathlib/Geometry/Diffeology/Basic.lean,docs/references.bib,scripts/noshake.json	4	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	12-46732 12 days ago	12-46734 12 days ago	0-518 8 minutes
8949	sebzim4500 author:sebzim4500	Add `by_approx` tactic for proving real inequalities using rational approximation	feat: Add `by_approx` tactic for proving real inequalities by finding rational approximations --- ```lean example : \|sqrt 2 - 1.414\| < 0.001 := by by_approx ``` This is a work in progress, the code is messy and the tactic is often very slow. It also depends on some other PRs that haven't been merged yet. It currently supports basic operations (`+`, `-`, `*`, `/`, `abs`) and has approximation extensions for `sqrt` and `exp`. - [ ] depends on: #8167 - [x] depends on: #8832 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict modifies-tactic-syntax 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	12-20079 12 days ago	377-45989 1 year ago	0-0 0 seconds
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 merge-conflict awaiting-author	20/1	Mathlib.lean,Mathlib/Analysis/Normed/Lp/MStructure.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean	3	26	['eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mans0954', 'mathlib4-dependent-issues-bot']	nobody	12-11416 12 days ago	12-11418 12 days ago	43-49391 43 days
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 merge-conflict	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	9	['adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	11-22480 11 days ago	11-22482 11 days ago	51-69759 51 days
25141	eric-wieser author:eric-wieser	feat: basis for multilinear maps	This attempts to tease an intermediate result out of #11155, which lets us show that multilinear maps are free even if their codomain is not finite. I guess this continues from https://github.com/leanprover-community/mathlib3/pull/10504 and https://github.com/leanprover-community/mathlib3/pull/14199. --- - [ ] depends on: #11155 - [ ] depends on: #25142 - [ ] depends on: #25169 - [ ] depends on: #25166 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	507/45	Mathlib.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/DFinsupp/PiTensorProduct.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/DirectSum/PiTensorProduct.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basis.lean,Mathlib/LinearAlgebra/Multilinear/DFinsupp.lean,Mathlib/LinearAlgebra/Multilinear/DirectSum.lean,Mathlib/LinearAlgebra/Multilinear/FiniteDimensional.lean,Mathlib/LinearAlgebra/Multilinear/Pi.lean	11	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	11-12772 11 days ago	11-12773 11 days ago	0-0 0 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	1674/3	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Exact.lean,Mathlib/CategoryTheory/Abelian/Basic.lean,Mathlib/CategoryTheory/Abelian/DiagramLemmas/Horseshoe.lean,Mathlib/CategoryTheory/Abelian/LeftDerived.lean,Mathlib/RingTheory/Flat/Basic.lean	8	21	['erdOne', 'github-actions', 'jjaassoonn', 'joelriou']	nobody	8-22011 8 days ago	394-39428 1 year ago	0-0 0 seconds
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.) --- - [x] depends on: #24773 - [ ] depends on: #24777 [![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	739/642	Mathlib.lean,Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/Colim.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/EnoughInjectives.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/Monomorphisms.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/Localization/FiniteProducts.lean,Mathlib/CategoryTheory/Monad/Types.lean,Mathlib/CategoryTheory/MorphismProperty/FunctorCategory.lean,Mathlib/CategoryTheory/MorphismProperty/LiftingProperty.lean,Mathlib/CategoryTheory/MorphismProperty/Limits.lean,Mathlib/CategoryTheory/MorphismProperty/TransfiniteComposition.lean,Mathlib/CategoryTheory/SmallObject/IsCardinalForSmallObjectArgument.lean,Mathlib/CategoryTheory/SmallObject/WellOrderInductionData.lean,Mathlib/CategoryTheory/Subobject/Types.lean,Mathlib/CategoryTheory/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	27	14	['callesonne', 'erdOne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	8-14275 8 days ago	27-14063 27 days ago	45-69656 45 days
24409	urkud author:urkud	chore(*): fix `nmem` vs `not_mem` names	--- There are some missing/buggy deprecations, I'm going to fix them later today or tomorrow. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip tech debt merge-conflict delegated awaiting-author	317/176	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/Group/Indicator.lean,Mathlib/Algebra/Group/Support.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Order/Group/Indicator.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Support.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/Rademacher.lean,Mathlib/Analysis/Complex/RemovableSingularity.lean,Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Analysis/Convex/Cone/Proper.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Distribution/AEEqOfIntegralContDiff.lean,Mathlib/Data/LocallyFinsupp.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Dynamics/Ergodic/Conservative.lean,Mathlib/Dynamics/Ergodic/Ergodic.lean,Mathlib/Dynamics/Ergodic/Function.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/FreeModule/PID.lean,Mathlib/LinearAlgebra/PID.lean,Mathlib/LinearAlgebra/RootSystem/Base.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Lemmas.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSpace/Indicator.lean,Mathlib/MeasureTheory/Integral/Average.lean,Mathlib/MeasureTheory/Integral/Bochner/Set.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Basic.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean,Mathlib/MeasureTheory/Measure/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Measure/AddContent.lean,Mathlib/MeasureTheory/Measure/DiracProba.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean,Mathlib/MeasureTheory/OuterMeasure/AE.lean,Mathlib/MeasureTheory/SetSemiring.lean,Mathlib/Order/Filter/AtTopBot/CountablyGenerated.lean,Mathlib/Order/Filter/Cocardinal.lean,Mathlib/Order/Filter/Cofinite.lean,Mathlib/Order/Filter/Tendsto.lean,Mathlib/Order/Filter/Ultrafilter/Basic.lean,Mathlib/Probability/Distributions/Uniform.lean,Mathlib/Probability/Kernel/Basic.lean,Mathlib/Probability/Kernel/Composition/MeasureCompProd.lean,Mathlib/RingTheory/AdicCompletion/LocalRing.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/NewtonIdentities.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/Spectrum/Maximal/Localization.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/Topology/Algebra/InfiniteSum/Group.lean,Mathlib/Topology/Algebra/Module/Cardinality.lean,Mathlib/Topology/Algebra/Support.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/ContinuousMap/BoundedCompactlySupported.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/UrysohnsLemma.lean	77	4	['b-mehta', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib-bors']	nobody	7-49043 7 days ago	7-49043 7 days ago	0-55045 15 hours
24596	joelriou author:joelriou	feat(Algebra/Homology): the derived category of a linear abelian category is linear	--- - [ ] depends on: #24191 - [ ] depends on: #24567 [![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	397/189	Mathlib.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/Algebra/Homology/HomotopyCategory/Shift.lean,Mathlib/Algebra/Homology/HomotopyCategory/SingleFunctors.lean,Mathlib/CategoryTheory/ObjectProperty/ContainsZero.lean,Mathlib/CategoryTheory/ObjectProperty/Shift.lean,Mathlib/CategoryTheory/Shift/Linear.lean,Mathlib/CategoryTheory/Triangulated/HomologicalFunctor.lean,Mathlib/CategoryTheory/Triangulated/Subcategory.lean	10	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	7-45066 7 days ago	28-7770 28 days ago	0-0 0 seconds
23730	faenuccio author:faenuccio	feat: define valued local fields	Co-authored by: @mariainesdff --- - [x] depends on: #23725 - [x] depends on: #23726 - [ ] depends on: #23727	large-import t-algebra t-number-theory merge-conflict blocked-by-other-PR label:t-algebra$	122/21	Mathlib.lean,Mathlib/NumberTheory/LocalField/Valued.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,docs/references.bib	4	11	['faenuccio', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	7-40993 7 days ago	28-8020 28 days ago	2-9769 2 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 merge-conflict label:t-algebra$	18/20	Mathlib/RingTheory/Kaehler/JacobiZariski.lean	1	38	['chrisflav', 'erdOne', 'github-actions', 'grunweg', 'kbuzzard', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	7-24653 7 days ago	7-24655 7 days ago	125-81208 125 days
24396	JovanGerb author:JovanGerb	feat(Order/Defs): refactor in preparation of `to_dual` attribute	When the `to_dual` attribute lands in Mathlib, we will tag many lemmas about order with this tag, which will automatically give us the dual statements. This PR prepares for this by - moving dual declarations closer together - replacing occurrences of `>` and `≥` with `<` and `≤` - consistently applying a new naming convention that helps us to name dual lemmas: we use the keywords `ge` and `gt` in place of `le` and `lt` to indicate that the same pair `a, b` in `a < b` is in the opposite order to the order in which it appeared the first time. - when we have to disambiguate the order of the argument to `<` or `≤`, we sometimes use `gt` or `ge` instead of `lt` or `le`. We also use this to get rid of many primed lemma names. This is a copy of #24376, but it doesn't remove the old lemma names, so doesn't require making changes in >500 files. deprecating these lemmas will be left to a future PR. [#mathlib4 > naming convention for ≤ and <](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/naming.20convention.20for.20.E2.89.A4.20and.20.3C) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-order merge-conflict	248/230	Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/Degree/Domain.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Char.lean,Mathlib/Data/Complex/Order.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Int/Order/Basic.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Factorization/Defs.lean,Mathlib/Data/Nat/Find.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/Num/ZNum.lean,Mathlib/Data/PSigma/Order.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/Data/Sigma/Order.lean,Mathlib/Data/String/Basic.lean,Mathlib/Data/Sum/Order.lean,Mathlib/GroupTheory/MonoidLocalization/Order.lean,Mathlib/NumberTheory/Zsqrtd/Basic.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Booleanisation.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Defs/PartialOrder.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/WithBot.lean,Mathlib/Probability/Martingale/Upcrossing.lean,Mathlib/RingTheory/UniqueFactorizationDomain/Multiplicity.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/SetTheory/Surreal/Basic.lean,Mathlib/Tactic/Linarith/Frontend.lean,MathlibTest/linarith.lean	43	5	['JovanGerb', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant']	bryangingechen assignee:bryangingechen	7-11145 7 days ago	7-11147 7 days ago	5-75236 5 days
25138	chrisflav author:chrisflav	chore(RingTheory): remove unnecessary `toRingHom` coercions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	32/40	Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/Kaehler.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/Unramified/Basic.lean	9	5	['chrisflav', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	7-10781 7 days ago	7-10783 7 days ago	9-64502 9 days
24965	erdOne author:erdOne	refactor: Make `IsLocalHom` take unbundled map	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-algebra merge-conflict awaiting-author label:t-algebra$	16/7	Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace/HasColimits.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean	5	6	['alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	6-62766 6 days ago	6-62767 6 days ago	10-26015 10 days
8740	digama0 author:digama0	fix: improve `recall` impl / error reporting	Simplifies the implementation of `recall`, fixing a bug [reported on Zulip](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/.60recall.60.20strangeness/near/405076713) and also eliminating a use of `open private`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI t-meta merge-conflict awaiting-author	27/39	Mathlib/Tactic/Recall.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	6-39272 6 days ago	6-39274 6 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 merge-conflict	72/5	Mathlib/Util/CountHeartbeats.lean,MathlibTest/CountHeartbeats.lean	2	17	['adomani', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib-bors']	adomani assignee:adomani	6-38133 6 days ago	6-38134 6 days ago	64-19141 64 days
17715	adomani author:adomani	feat: the unusedVariableCommand linter	This is still work-in-progress, but also help-wanted! The linter reliably flags unused variables: so far, only `example`s fool it (and that is simply because I did not implement a fix, as there are very few `variable`s that are only used in `example`s in mathlib). The work-in-progress part refers to the fact that the linter uses an `IO.Ref` to keep track of variables and this does not work well with editing the file. The linter works on a fresh parse of a file, but becomes out-of-sync with every edit. The help-wanted is to ask for help to make mathlib compliant with the linter, by checking out this branch and PR-ing a few variable removals! [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Unused.20variables) --- Known issues: * automatic namespacing and `nonrec` may cause difficulty when the newly introduced declaration is preferred in the term, rather than the original one (see examples here ```bash code -r -g ././././Mathlib/Analysis/SpecialFunctions/Arsinh.lean:183 code -r -g ././././Mathlib/Probability/Independence/Basic.lean:368 ``` where, for instance, `ContinuousOn.arsinh` is used internally instead of `Real.arsinh`). * `mutual` declarations confuse the linter ```bash code -r -g ././././Mathlib/SetTheory/Lists.lean:313 ``` * `code -r -g Mathlib/CategoryTheory/EffectiveEpi/Comp.lean:133:29` * universe annotations confuse the linter: ```bash code -r -g ././././Mathlib/Topology/Category/CompactlyGenerated.lean:53 code -r -g ././././Mathlib/AlgebraicTopology/CechNerve.lean:46 ``` * `inductive`s confusing the linter ```bash code -r -g ././././Mathlib/Deprecated/Subgroup.lean:389 code -r -g ././././Mathlib/FieldTheory/PerfectClosure.lean:55 ``` * `def`s confusing the linter ```bash code -r -g ././././Mathlib/Data/MLList/BestFirst.lean:104 ``` * special typeclass assumptions ```code code -r -g ././././Mathlib/RingTheory/WittVector/Truncated.lean:273 code -r -g ././././Mathlib/Topology/Category/Profinite/Product.lean:79 ``` * not sure what is going on here: ```bash code -r -g ././././Mathlib/RingTheory/WittVector/IsPoly.lean:95 code -r -g ././././Mathlib/Probability/Independence/Basic.lean:368 code -r -g ././././Mathlib/Analysis/Calculus/FDeriv/Star.lean:30 ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict	695/22	Mathlib.lean,Mathlib/Algebra/Group/Idempotent.lean,Mathlib/Algebra/GroupWithZero/Idempotent.lean,Mathlib/Data/Finite/Defs.lean,Mathlib/Data/Int/Cast/Field.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Init.lean,Mathlib/MeasureTheory/Function/LpSpace/DomAct/Continuous.lean,Mathlib/NumberTheory/LSeries/PrimesInAP.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/BoundedOrder/Lattice.lean,Mathlib/Order/BoundedOrder/Monotone.lean,Mathlib/Order/Monotone/Monovary.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/UnusedVariableCommand.lean,MathlibTest/UnusedVariableCommand.lean,lakefile.lean	17	n/a	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	6-16769 6 days ago	unknown	unknown
22909	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/Pure): pure submodules	A submodule `N` of an `R`-module is pure if all maps `S ⊗[R] N → S ⊗[R] M` deduced by base change from the injection of `N` into `M` are injective, for all `R`-algebras `S`. This is expressed by the class `Submodule.IsPure`. For type theoretic reason, the definition of `Submodule.IsPure` only considers algebras `S` in the same universe as `R`, but `Submodule.IsPure.baseChange_injective` establishes the property for all universes. * `Submodule.IsComplemented.isPure` : a complemented submodule is pure. Co-authored with @mariainesdff --- - [ ] depends on: #22898 - [ ] depends on: #22908 - [x] depends on: #22911 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict 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	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	6-15600 6 days ago	6-15602 6 days ago	0-1047 17 minutes
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 merge-conflict 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	7	['Timeroot', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	6-15377 6 days ago	6-15380 6 days ago	2-32155 2 days
25280	Brian-Nugent author:Brian-Nugent	feat: add `IsLocalRing.embDim`, the embedding dimension of a local ring	This adds the embedding dimension of a local ring and proves basic properties about it. In particular, it proves that if we mod out by an element that is non-zero in the cotangent space, then the embedding dimension drops by exactly one. Co-Authored-By: Jarod Alper [jarod@uw.edu](mailto:jarod@uw.edu) --- [![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$	493/2	Mathlib.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/RingTheory/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRing/RingHom/Basic.lean,lake-manifest.json	5	18	['Brian-Nugent', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant']	nobody	6-13599 6 days ago	8-53929 8 days ago	3-2521 3 days
24105	urkud author:urkud	feat(Topology/UniformSpace/Path): new file	--- - [x] depends on: #24066 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict awaiting-author	117/5	Mathlib.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	6	10	['ADedecker', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'sgouezel', 'urkud']	nobody	6-11152 6 days ago	6-11153 6 days ago	12-77412 12 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 merge-conflict awaiting-author	12/11	Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finset/Lattice/Lemmas.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Disjoint.lean,Mathlib/Order/Disjoint.lean,Mathlib/Topology/Compactification/OnePoint.lean,Mathlib/Topology/Order/OrderClosed.lean	7	31	['YaelDillies', 'eric-wieser', 'github-actions', 'grunweg', 'j-loreaux', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	nobody	5-22494 5 days ago	5-22497 5 days ago	32-65400 32 days
24881	smmercuri author:smmercuri	feat: `InfinitePlace.Extension` API for extensions of infinite places.	If `L / K` are fields and `v : InfinitePlace K`, then we define - `v.Extension L` : the subtype of `w : InfinitePlace L` whose restriction to `K` matches `v`. - `isExtension_or_isExtension_conjugate` : if `w` extends `v`, then either `w.embedding` extends `v.embedding` or `conjugate w.embedding` extends `v.embedding` - `IsLift`: class encoding the case where `w` extends `v` and `w.embedding` extends `v.embedding`. - `IsConjugateLift`: class encoding the case where `w` extends `v` and `conjugate w.embedding` extends `v.embedding`. --- - [ ] depends on: #24877 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	181/0	Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	5-7757 5 days ago	5-7758 5 days ago	0-1074 17 minutes
24877	smmercuri author:smmercuri	feat: predicates for extensions of complex embeddings	If `L/K`, `ψ : K →+* ℂ`, `φ : L →+* ℂ` we define three predicates asserting ways that `φ` can extend `ψ`. - `IsExtension ψ φ` : the restriction of `φ` to `K` is `ψ`. - `IsMixedExtension ψ φ` : the restriction of `φ` to `K` is `ψ`, `ψ` has real image while `φ` has complex image. - `IsUnmixedExtension ψ φ`: the restriction of `φ` to `K` is `ψ`, `ψ` has real image if and only if `φ` has real image. `IsMixedExtension` and `IsUnmixedExtension` are the `ComplexEmbedding` analogues to ramified and unramified infinite places. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory merge-conflict	91/0	Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean	1	7	['github-actions', 'leanprover-community-bot-assistant', 'smmercuri', 'xroblot']	nobody	5-7757 5 days ago	5-7759 5 days ago	21-40253 21 days
24882	smmercuri author:smmercuri	feat: `RamifiedExtension` and `UnramifiedExtension` types for `InfinitePlace.Extension`s	- `v.RamifiedExtension L` : the subtype of `v.Extension L` consisting of ramified extensions. - `v.UnramifiedExtension L` : the subtype of `v.Extension L` consisting of unramified extensions. --- - [ ] depends on: #24877 - [x] depends on: #24880 [![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	258/0	Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	5-7756 5 days ago	5-7757 5 days ago	0-655 10 minutes
25404	grunweg author:grunweg	perf: benchmarking #24924	Let's see if reverting this shows a similar performance hit. --- Previous summary: [#rss > Benchmark results for mathlib4 @ 💬](https://leanprover.zulipchat.com/#narrow/channel/116290-rss/topic/Benchmark.20results.20for.20mathlib4/near/522168494) Post-merge benchmarking run: https://speed.lean-lang.org/mathlib4/run-detail/772a3867-c7bc-47fe-b380-f5f70e2ccb1b [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	bench-after-CI merge-conflict WIP	26/45	Mathlib/Init.lean,MathlibTest/AssertExists.lean,lakefile.lean,scripts/noshake.json	4	8	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'mattrobball']	nobody	5-7024 5 days ago	5-7026 5 days ago	0-11 11 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	4-29888 4 days ago	365-77760 1 year 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	4-29888 4 days ago	380-35792 1 year 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	4-29888 4 days ago	381-35556 1 year 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	4-29888 4 days ago	97-57167 3 months 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	4-29888 4 days ago	107-76302 3 months 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	4-29888 4 days ago	306-3670 10 months ago	0-0 0 seconds
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	4-29888 4 days ago	80-6602 2 months 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	4-29888 4 days ago	80-6066 2 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	4-29888 4 days ago	66-75572 2 months ago	0-2933 48 minutes
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	28/85	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,lean-toolchain	65	11	['github-actions', 'kmill', 'leanprover-bot', 'leanprover-community-bot-assistant']	nobody	4-29888 4 days ago	50-35519 1 month ago	0-0 0 seconds
25352	kmill author:kmill	Lean pr testing 8373 (for benchmarking)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	16/14	Mathlib/CategoryTheory/Monad/Comonadicity.lean,Mathlib/CategoryTheory/Monad/Monadicity.lean,Mathlib/Data/PFunctor/Univariate/M.lean,Mathlib/FieldTheory/Finite/GaloisField.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Decomposition/Jordan.lean,Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/Tactic/ModCases.lean,lake-manifest.json,lakefile.lean,lean-toolchain	12	6	['github-actions', 'kmill', 'leanprover-bot', 'leanprover-community-bot-assistant']	nobody	4-29888 4 days ago	7-59000 7 days ago	0-0 0 seconds
16062	adomani author:adomani	Test/ci olean size	Tests for oleans --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict awaiting-author WIP	114/0	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,scripts/olean_comparison.sh	5	4	['Parcly-Taxel', 'adomani', 'github-actions', 'leanprover-community-bot-assistant']	nobody	3-59392 3 days ago	3-59393 3 days ago	0-16 16 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 merge-conflict	120/0	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,scripts/olean_comparison.sh	5	50	['Vtec234', 'YaelDillies', 'adomani', 'bryangingechen', 'github-actions', 'grunweg', 'kim-em', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	3-59392 3 days ago	3-59394 3 days ago	285-26861 285 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 merge-conflict delegated	20/8	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml	4	6	['adomani', 'github-actions', 'grunweg', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib-bors']	nobody	3-59146 3 days ago	3-59148 3 days ago	7-42070 7 days
25507	eric-wieser author:eric-wieser	chore(RingTheory/Valuation): golf using `Con`	This has no particular motivation besides seeing if `Con` is a performant substitute. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	bench-after-CI t-algebra merge-conflict label:t-algebra$	20/35	Mathlib/RingTheory/Valuation/ValuationRing.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	3-50871 3 days ago	3-50872 3 days ago	0-0 0 seconds
7596	alreadydone author:alreadydone	feat: covering maps from properly discontinuous actions and discrete subgroups	--- - [x] depends on: #23236 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-topology merge-conflict	351/21	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Pointwise.lean,Mathlib/Topology/Covering/AddCircle.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Galois.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Instances/AddCircle.lean	9	17	['ADedecker', 'alreadydone', 'digama0', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	3-27315 3 days ago	3-27317 3 days ago	48-80629 48 days
25432	riccardobrasca author:riccardobrasca	Rb cyclo	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	1320/2	Mathlib.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Data/ZMod/QuotientRing.lean,Mathlib/GroupTheory/Exponent.lean,Mathlib/LinearAlgebra/Dimension/Finrank.lean,Mathlib/NumberTheory/NumberField/Ideal/KummerDedekind.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Atoms.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/Ideal/Int.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Span.lean,Mathlib/Stuff/Cyclotomic.lean,Mathlib/Stuff/Eleven.lean,Mathlib/Stuff/Factorization.lean,Mathlib/Stuff/Inertia.lean,Mathlib/Stuff/Minkowski.lean,Mathlib/Stuff/OrderOf.lean,Mathlib/Stuff/Seven.lean,Mathlib/Stuff/Thirteen.lean	21	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	3-8828 3 days ago	3-8830 3 days ago	0-0 0 seconds
12799	jstoobysmith author:jstoobysmith	feat(LinearAlgebra/UnitaryGroup): Add properties of Special Unitary Group	Add properties of the special unitary group, mirroring the properties of found in Algebra/Star/Unitary.lean. In particular, I add an instance of `specialUnitaryGroup` as a `Group`, `Star`, `InvolutiveStar`, and `StarMul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict please-adopt awaiting-author label:t-algebra$	78/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	8	['chrisflav', 'jcommelin', 'leanprover-community-bot-assistant']	nobody	2-67738 2 days ago	2-67740 2 days ago	9-22007 9 days
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 merge-conflict awaiting-author 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	12	['FR-vdash-bot', 'github-actions', 'grunweg', 'jcommelin', 'leanprover-bot', 'leanprover-community-bot-assistant']	nobody	2-46984 2 days ago	2-46984 2 days ago	17-72244 17 days
23709	plp127 author:plp127	feat: `Nat.findFrom`	This PR adds `Nat.findFrom`, which is like `Nat.find`, but starting from an arbitrary `k` instead of `0`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	190/47	Mathlib/Data/Nat/Find.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	2-33027 2 days ago	2-33029 2 days ago	62-25661 62 days
25038	xroblot author:xroblot	feat(NumberField): specialized version of Kummer Dedekind for the splitting of prime numbers	We prove a specialized version of [KummerDedekind.normalizedFactorsMapEquivNormalizedFactorsMinPolyMk](https://leanprover-community.github.io/mathlib4_docs/Mathlib/NumberTheory/KummerDedekind.html#KummerDedekind.normalizedFactorsMapEquivNormalizedFactorsMinPolyMk) for the splitting of rational prime numbers in number fields. --- - [x] depends on: #25080 - [x] depends on: #25149 - [x] depends on: #25316 - [x] depends on: #25388 - [ ] depends on: #25527 - [x] depends on: #25528 [![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 WIP	406/1	Mathlib.lean,Mathlib/Data/ZMod/QuotientRing.lean,Mathlib/GroupTheory/Exponent.lean,Mathlib/LinearAlgebra/Dimension/Finrank.lean,Mathlib/NumberTheory/NumberField/Ideal/KummerDedekind.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Atoms.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/Ideal/Int.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Span.lean	12	6	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	riccardobrasca assignee:riccardobrasca	2-32260 2 days ago	3-8955 3 days ago	0-9855 2 hours
25340	dupuisf author:dupuisf	chore(Analysis/Convex): move files pertaining to convex/concave functions to their own folder	This PR creates a new folder under `Analysis/Convex` called `Analysis/Convex/Function`, which includes files that are mostly or entirely about convex/concave functions (as opposed to convex sets). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry merge-conflict	4264/4155	Mathlib.lean,Mathlib/Analysis/Convex/Continuous.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convex/Extrema.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Function/Basic.lean,Mathlib/Analysis/Convex/Function/Continuous.lean,Mathlib/Analysis/Convex/Function/Deriv.lean,Mathlib/Analysis/Convex/Function/Extrema.lean,Mathlib/Analysis/Convex/Function/Integral.lean,Mathlib/Analysis/Convex/Function/Jensen.lean,Mathlib/Analysis/Convex/Function/Mul.lean,Mathlib/Analysis/Convex/Function/Piecewise.lean,Mathlib/Analysis/Convex/Function/Quasiconvex.lean,Mathlib/Analysis/Convex/Function/Slope.lean,Mathlib/Analysis/Convex/Function/Strong.lean,Mathlib/Analysis/Convex/Integral.lean,Mathlib/Analysis/Convex/Jensen.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/Piecewise.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Convex/SpecificFunctions/Basic.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/Convex/Strong.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Log/NegMulLog.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/MeasureTheory/Measure/Decomposition/IntegralRNDeriv.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean	34	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	2-32212 2 days ago	2-32214 2 days ago	6-40169 6 days
24808	JovanGerb author:JovanGerb	lean pr testing 8294	Testing a cache optimization in `isDefEq`, to avoid exponential blowup during unification. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	243/98	Mathlib.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Preimage.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/NeZero.lean,Mathlib/Algebra/Homology/DifferentialObject.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/Analysis/Complex/ValueDistribution/CharacteristicFunction.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/LConvolution.lean,Mathlib/Analysis/NormedSpace/Alternating/Curry.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Int/Init.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Vector/MapLemmas.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/MeasureTheory/Group/Convolution.lean,Mathlib/MeasureTheory/Group/IntegralConvolution.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean,Shake/Main.lean,lake-manifest.json,lakefile.lean,lean-toolchain	35	21	['JovanGerb', 'adomani', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	2-686 2 days ago	2-686 2 days ago	0-11360 3 hours
13994	grunweg author:grunweg	chore(Topology): replace continuity -> fun_prop	Addresses a few porting notes; I expect also a substantial speed-up of some proofs. Change a few default values of proof fields from `continuity` to `fun_prop`; this required a few fix-ups downstream. (I checked a few instances; the failure seems related to `Continuous.subtype_mk` not always firing.) This is almost (but not fully) exhaustive. ---------- One proof gets partially un-automated (cont. -> partial fun_prop); if desired, I can revert this change. - [x] depends on: #11092 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	105/20	Mathlib/Analysis/Distribution/FourierSchwartz.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Dynamics/Flow.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/Topology/Algebra/Field.lean,Mathlib/Topology/Algebra/Monoid.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean,Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean,Mathlib/Topology/ContinuousMap/Basic.lean,Mathlib/Topology/ContinuousMap/Bounded/Basic.lean,Mathlib/Topology/ContinuousMap/Compact.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean,Mathlib/Topology/ExtremallyDisconnected.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Instances/RealVectorSpace.lean,Mathlib/Topology/MetricSpace/Perfect.lean,Mathlib/Topology/UnitInterval.lean	18	12	['MichaelStollBayreuth', 'github-actions', 'grunweg', 'j-loreaux', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	1-50885 1 day ago	276-70516 9 months ago	28-21477 28 days
21734	adomani author:adomani	fix(PR summary): checkout GITHUB_SHA	This should make the version of the script that is used on PRs more stable. Suggested by Eric Wieser on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/messageFile.2Emd/near/498941855). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict awaiting-author WIP	2/1	.github/workflows/PR_summary.yml	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	1-48879 1 day ago	1-48881 1 day ago	0-6023 1 hour
25012	urkud author:urkud	refactor(*): migrate from `Matrix.toLin'` to `Matrix.mulVecLin`	or `Matrix.mulVec` whenever we don't need the `LinearEquiv.symm` part. See [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Matrix.2EtoLin'.20vs.20Matrix.2EmulVecLin/with/515188548). It makes sense to have only one normal form, and `Matrix.toLin'` has an extra `DecidableEq` assumption. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	154/122	Mathlib/Algebra/Lie/Matrix.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Rank.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Finsupp/VectorSpace.lean,Mathlib/LinearAlgebra/FreeModule/Finite/Matrix.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Minpoly.lean,Mathlib/LinearAlgebra/Matrix/Diagonal.lean,Mathlib/LinearAlgebra/Matrix/Gershgorin.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Matrix/ToLinearEquiv.lean,Mathlib/LinearAlgebra/UnitaryGroup.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean	21	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	1-27046 1 day ago	1-27048 1 day ago	15-74981 15 days
24434	joelriou author:joelriou	feat(CategoryTheory): effectiveness of descent	Co-authored-by: Christian Merten [christian@merten.dev](mailto:christian@merten.dev) --- - [ ] depends on: #24411 - [ ] depends on: #24382 - [ ] depends on: #24384 - [ ] depends on: #13539 [![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	4052/66	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Adj.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/BaseChange.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Mate.lean,Mathlib/CategoryTheory/Bicategory/Functor/Cat.lean,Mathlib/CategoryTheory/Bicategory/Functor/LocallyDiscrete.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean,Mathlib/CategoryTheory/Bicategory/Opposite.lean,Mathlib/CategoryTheory/CommSq.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean,Mathlib/CategoryTheory/Sites/Descent/DescentData.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataAsCoalgebra.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataDoublePrime.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataPrime.lean,Mathlib/CategoryTheory/Sites/Descent/IsPrestack.lean,Mathlib/CategoryTheory/Sites/Descent/IsStack.lean,Mathlib/CategoryTheory/Sites/Descent/ModuleCat.lean,Mathlib/CategoryTheory/Sites/Descent/PullbackStruct.lean	19	8	['callesonne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	1-21667 1 day ago	2-32904 2 days 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 merge-conflict awaiting-author	325/0	.github/build.in.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ValidatePRTitle.lean,MathlibTest/ValidatePRTitle.lean,lakefile.lean,scripts/README.md,scripts/check-title-labels.lean	8	44	['Command-Master', 'adomani', 'bryangingechen', 'edegeltje', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant']	bryangingechen assignee:bryangingechen	0-54766 15 hours ago	0-54767 15 hours ago	78-54824 78 days
14752	AntoineChambert-Loir author:AntoineChambert-Loir	fix(Topology/Algebra/Valued): repair definition of Valued	Following a [discussion on Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Question.20about.20.60Valued.2Eis_topological_valuation.60), we modify the definition of the field `is_topological_valuation` of `Valued` insisting that the element $\gamma$ showing up there is in the subgroup generated by the image of the valuation map. Co-authored-by: @faenuccio - [ ] depends on: #25496	t-algebra t-topology merge-conflict blocked-by-other-PR WIP label:t-algebra$	1166/301	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean,Mathlib/Topology/UniformSpace/AbstractCompletion.lean,docs/references.bib	12	28	['AntoineChambert-Loir', 'faenuccio', 'github-actions', 'jcommelin', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	0-53401 14 hours ago	0-53403 14 hours ago	1-33784 1 day
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 merge-conflict	5/4	Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Data/Int/WithZero.lean	3	19	['BoltonBailey', 'Ruben-VandeVelde', 'eric-wieser', 'fpvandoorn', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	0-50895 14 hours ago	0-50897 14 hours ago	52-38111 52 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 - [x] 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	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-41043 11 hours ago	unknown	unknown
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 - [x] 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	n/a	['101damnations', 'acmepjz', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-41042 11 hours 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`. --- - [x] depends on: #21652 - [x] 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	0-41011 11 hours ago	unknown	unknown
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. --- - [x] depends on: #21652 - [x] 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	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-41010 11 hours ago	unknown	unknown
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. --- - [x] depends on: #21652 - [x] 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	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-41009 11 hours ago	unknown	unknown
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. --- - [x] depends on: #21652 - [x] depends on: #21732 - [x] 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	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-41008 11 hours ago	unknown	unknown
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. --- - [x] depends on: #21652 - [x] 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	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-41007 11 hours ago	unknown	unknown
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`. --- - [x] depends on: #21652 - [x] 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	0-41007 11 hours ago	52-84569 1 month 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`. --- - [x] depends on: #21652 - [x] 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	0-41006 11 hours ago	52-84562 1 month 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. --- - [x] depends on: #21652 - [x] 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	0-41005 11 hours ago	52-84554 1 month 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`. --- - [x] depends on: #21652 - [x] 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/)	file-removed large-import t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	1991/961	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/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/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	19	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-41004 11 hours ago	unknown	unknown
25311	101damnations author:101damnations	feat(RepresentationTheory/GroupCohomology): long exact sequences (again)	--- - [ ] depends on: #25310 [![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$	706/542	Mathlib.lean,Mathlib/Algebra/Homology/ConcreteCategory.lean,Mathlib/Algebra/Homology/HomologySequence.lean,Mathlib/Algebra/Homology/ShortComplex/SnakeLemma.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Functoriality.lean,Mathlib/RepresentationTheory/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/GroupCohomology/LongExactSequence.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean	10	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-35790 9 hours ago	0-35791 9 hours ago	0-10 10 seconds
24822	CBirkbeck author:CBirkbeck	feat: define the Eisenstein Series E2	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory merge-conflict	159/0	Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/UniformConvergence.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	0-22053 6 hours ago	0-22055 6 hours ago	0-0 0 seconds
24962	loefflerd author:loefflerd	WIP towards Hecke bound for q-expansions	The aim of this PR is to prove various statements about boundedness properties of modular forms. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory merge-conflict WIP	793/139	Mathlib.lean,Mathlib/NumberTheory/ModularForms/Bounds.lean,Mathlib/NumberTheory/ModularForms/CongruenceSubgroups.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/IsBoundedAtImInfty.lean,Mathlib/NumberTheory/ModularForms/Identities.lean,Mathlib/NumberTheory/ModularForms/LevelOne.lean,Mathlib/NumberTheory/ModularForms/Petersson.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean	8	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	0-21930 6 hours ago	0-21932 6 hours ago	0-1 1 second
25393	CBirkbeck author:CBirkbeck	feat: Add more Summability results needed for Eisenstein series.	We add results about the summability of the term (c z + d)^-k that are needed for Eisenstein series (such as E2). --- - [ ] depends on: #25443 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory merge-conflict WIP	248/134	Mathlib.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Complex/Asymptotics.lean,Mathlib/Analysis/Normed/Group/Bounded.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/IsBoundedAtImInfty.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Summable.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/UniformConvergence.lean	7	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-21536 5 hours ago	0-21538 5 hours ago	1-10522 1 day
25448	CBirkbeck author:CBirkbeck	Add the Mittag-Leffler expansion for cotangent	We prove the Mittag-Leffler series expansion for `cot(pi z)`, which says ``` theorem cot_series_rep {z : ℂ} (hz : z ∈ ℂ_ℤ) : π * Complex.cot (π * z) = 1 / z + ∑' n : ℕ+, (1 / ((z : ℂ) - n) + 1 / (z + n)) ``` --- - [x] depends on: #25446 - [ ] depends on: #25393 - [ ] depends on: #25443 [![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	430/137	Mathlib.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Complex/Asymptotics.lean,Mathlib/Analysis/Complex/IntegerCompl.lean,Mathlib/Analysis/Complex/LocallyUniformLimit.lean,Mathlib/Analysis/Normed/Group/Bounded.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/IsBoundedAtImInfty.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Summable.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/UniformConvergence.lean	11	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-21535 5 hours ago	0-21537 5 hours ago	0-1521 25 minutes
25219	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve): generalise nonsingular condition	--- - [ ] depends on: #24593 - [ ] depends on: #25323 - [x] depends on: #25378 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-algebraic-geometry awaiting-CI merge-conflict blocked-by-other-PR WIP label:t-algebra$	1527/1274	Mathlib/Algebra/Module/PID.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Span.lean	13	5	['github-actions', 'kckennylau', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-7337 2 hours ago	2-57062 2 days ago	0-1 1 second
24789	Ruben-VandeVelde author:Ruben-VandeVelde	chore: move Algebra.Group.Hom.End to Algebra.Ring	--- [![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$	55/50	Mathlib.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Ring/Hom/End.lean	5	6	['Ruben-VandeVelde', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	0-5911 1 hour ago	0-5913 1 hour ago	0-1530 25 minutes
25264	linesthatinterlace author:linesthatinterlace	feat: add elementary lifts for `OneHom`, `MulHom`, `MonoidHom` and `RingHom`.	Adds `liftRight` and `liftLeft` constructions for `OneHom`, `MulHom` and `MonoidHom`. --- The plan is to implement `Units.liftRight` and possibly other "lift"-style monoid constructions (e.g. `liftOfRightInverse`) using these. This should probably be in a future PR but I could consider adding it to this one once the initial changes are stable. Note that these constructions are added relatively deep as they do not need much in the way of pre-requisites. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	412/11	Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Ring/Hom/Basic.lean,Mathlib/Algebra/Ring/Hom/Defs.lean	4	7	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	0-5787 1 hour ago	0-5789 1 hour ago	12-4669 12 days
25296	linesthatinterlace author:linesthatinterlace	feat: Add high-level generalizations from `MonoidHom` lifts	Replaces high-level definitions of `liftOfRightInverse` etc. with low-level equivalents. --- - [ ] depends on: #25290 - [ ] depends on: #25264 [![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$	1256/168	Mathlib/Algebra/Category/Ring/FinitePresentation.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/Ring/Hom/Basic.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Data/Int/Cast/Lemmas.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/DirichletCharacter/Basic.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Polynomial/Content.lean,Mathlib/RingTheory/RootsOfUnity/Minpoly.lean	17	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-5663 1 hour ago	0-5665 1 hour ago	0-688 11 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
25173	Timeroot author:Timeroot	"Junk value" test file	Add to MathlibTest a file that documents junk values of many functions, and explains some of their motivations and gotchas. --- Based on the conversation [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/Documenting.20lean.20pitfalls.3A.20feedback.20requested/near/520155520). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		362/2	Mathlib/Data/Nat/Find.lean,MathlibTest/Junk.lean	2	15	['Timeroot', 'github-actions', 'plp127']	nobody	11-84537 11 days ago	15-59398 15 days ago	15-59382 15 days
25474	adomani author:adomani	test for .lean/.md check	A test PR for #25473. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed	10/1	.github/workflows/lint_and_suggest_pr.yml,Mathlib.lean,Mathlib/NumberTheory/NumberField/CMField.Lean	3	1	['github-actions']	nobody	4-36516 4 days ago	4-37849 4 days ago	4-37907 4 days
25459	emilyriehl author:emilyriehl	Feat(CategoryTheory): terminal categories with an application to hoFunctor	Some preliminary API around terminal categories is developed with an application for the infinity-cosmos project: proving that the homotopy category functor preserves terminal objects. We also include proofs that `[0]` is terminal in the simplex category and `Δ[0]` is the terminal simplicial set. Co-authored by [Robin Carlier](robin.carlier@ens-lyon.fr), [Adam Topaz](topaz@ualberta.ca), and [Zeyi Zhao](zzhao95@jh.edu). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos large-import t-category-theory	178/3	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/CategoryTheory/Category/Cat/Terminal.lean,Mathlib/CategoryTheory/Category/ReflQuiv.lean,Mathlib/CategoryTheory/Quotient.lean	7	3	['emilyriehl', 'github-actions', 'jcommelin']	nobody	2-47711 2 days ago	4-23991 4 days ago	4-81274 4 days
25608	TOMILO87 author:TOMILO87	Add Beta distribution	feat(Probability/Distributions): add Beta distribution Add the Beta distribution to the probability distributions in mathlib4. This implementation includes: - Definition of the Beta function over the reals - The probability density function (PDF) of the Beta distribution - Proof that the PDF integrates to 1 - Various lemmas about measurability and positivity properties The Beta distribution is a family of continuous probability distributions defined on the interval [0, 1] parametrized by two positive shape parameters, α and β, that control the shape of the distribution. The implementation follows a similar structure to other distributions in mathlib4, particularly the Gamma distribution, adapting the approach to the specific properties of the Beta distribution. --- [![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/Probability/Distributions/Beta.lean	2	1	['github-actions']	nobody	0-76007 21 hours ago	0-76019 21 hours ago	0-76075 21 hours
25470	mans0954 author:mans0954	Low order roots of unity	Compute some low order roots of unity. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/roots.20of.20unity.20-.20computing.20low.20degree/with/520523576) Cubic case contributed by @MichaelStollBayreuth See also: #25215, #24828 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	182/0	Mathlib/Algebra/CharP/Invertible.lean,Mathlib/RingTheory/RootsOfUnity/Complex.lean	2	1	['github-actions']	nobody	0-46136 12 hours ago	0-46136 12 hours ago	2-75320 2 days
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	4-29888 4 days ago	66-75572 2 months ago	0-2933 48 minutes
24808	JovanGerb author:JovanGerb	lean pr testing 8294	Testing a cache optimization in `isDefEq`, to avoid exponential blowup during unification. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	243/98	Mathlib.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Preimage.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/NeZero.lean,Mathlib/Algebra/Homology/DifferentialObject.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/Analysis/Complex/ValueDistribution/CharacteristicFunction.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/LConvolution.lean,Mathlib/Analysis/NormedSpace/Alternating/Curry.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Int/Init.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Vector/MapLemmas.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/MeasureTheory/Group/Convolution.lean,Mathlib/MeasureTheory/Group/IntegralConvolution.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean,Shake/Main.lean,lake-manifest.json,lakefile.lean,lean-toolchain	35	21	['JovanGerb', 'adomani', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	2-686 2 days ago	2-686 2 days ago	0-11360 3 hours

PRs without an area label

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
25238	Hagb author:Hagb	feat(Tactic/ComputeDegree): add support for scalar multiplication with different types	It would be able to deal with `a • (X : R[X])` where `a : S` is in a different type `S` with `[SMulZeroClass S R]`. --- - [x] depends on: #25237 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	17/5	Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	12-56734 12 days ago	12-81177 12 days ago	12-83080 12 days
25253	Ruben-VandeVelde author:Ruben-VandeVelde	feat: add AlgHom.natCard_of_splits	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		21/7	Mathlib/FieldTheory/PrimitiveElement.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/SetTheory/Cardinal/Finite.lean	3	1	['github-actions']	nobody	12-43025 12 days ago	12-43107 12 days ago	12-43091 12 days
25327	YaelDillies author:YaelDillies	feat: `F.obj M` is a commutative monoid object if `M` is	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric	11/3	Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean	2	1	['github-actions']	nobody	7-35334 7 days ago	9-34472 9 days ago	9-34465 9 days
25407	adomani author:adomani	feat: check that the mathlib options exist	This PR adds a simple check that all the options mentioned in `mathlibStandardSet` exist (at least, the ones that do exist!). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge	18/0	Mathlib/Init.lean	1	5	['adomani', 'github-actions', 'grunweg']	nobody	4-85198 4 days ago	4-85198 4 days ago	5-82859 5 days
25484	VTrelat author:VTrelat	feat(SetTheory/ZFC/Booleans): define Boolean algebra in ZFC	Extend the model of ZFC with Boolean algebra: - define a set 𝔹 of booleans - define a proper type `ZFBool` representing booleans - add theorems on usual algebraic properties of booleans - provide usual boolean notations like `⊤`, `⊥`, `∧`, `∨`, etc. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483	new-contributor blocked-by-other-PR	619/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-24128 4 days ago	4-24130 4 days ago	0-1523 25 minutes
25485	VTrelat author:VTrelat	feat(SetTheory/ZFC/Naturals): define natural numbers in ZFC	Extend the model of ZFC with naturals: - define a set `Nat` of naturals following the usual construction (∅, {∅}, {∅, {∅}}, ...) - define a proper type `ZFNat` representing naturals - add theorems on usual algebraic properties of naturals - provide a recursor and induction schemes to define/prove by induction --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depend on: #25483	new-contributor	2095/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Naturals.lean	4	1	['github-actions']	nobody	4-22216 4 days ago	4-22281 4 days ago	4-22277 4 days
25488	VTrelat author:VTrelat	feat(SetTheory/ZFC/Rationals): define rationals in ZFC	Extend the model of ZFC with rationals: we define a proper type `ZFRat` representing integers based on pairs of `ZFInt` (enforcing the res to be nonzero) and following the usual construction of rationals. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483 - [ ] depends on: #25485 - [ ] depends on: #25486	new-contributor blocked-by-other-PR	2070/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Integers.lean,Mathlib/SetTheory/ZFC/Rationals.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-19805 4 days ago	4-19807 4 days ago	0-1808 30 minutes
25486	VTrelat author:VTrelat	feat(SetTheory/ZFC/Integers): define integers in ZFC	Extend the model of ZFC with integers following the converse direction as for naturals. We first define a type and then build a set. We finally show that both representations have coercions in both direction: - define a proper type `ZFInt` representing integers based on `ZFNat × ZFNat` and following the usual construction of integers - add theorems on usual algebraic properties of integers - define a set `Int` and show that it matches-i.e. that it is isomorphic to-the type `ZFInt` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483 - [ ] depends on: #25485	new-contributor blocked-by-other-PR	2003/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Integers.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-19803 4 days ago	4-19805 4 days ago	0-2067 34 minutes
25537	literandltx author:literandltx	feat(number_theory/legendre_symbol): Add sqrt‐of‐residue theorems for p=4k+3 and p=8k+5	Add a new file `QuadraticResidueRoots.lean` under `Mathlib/NumberTheory/LegendreSymbol/` that proves two explicit “square-root of quadratic residue” theorems for primes of the specific form. - `exists_sqrt_of_residue_mod4_eq3` for primes `p = 4k + 3` - `exists_sqrt_of_residue_mod8_eq5`* for primes `p = 8*k + 5` It also introduces the helper lemmas `euler_criterion_traditional` and `legendreSym.at_two_mod8_eq_5`. Import lines in `Mathlib.lean` and `Mathlib/NumberTheory/LegendreSymbol/Basic.lean` have been updated accordingly.	new-contributor	217/0	Mathlib.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticReciprocity.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticResidueRoots.lean	4	0	[]	nobody	3-19735 3 days ago	3-19735 3 days ago	0-0 0 seconds
25604	sgouezel author:sgouezel	feat: make sure that the simp normal form of equiv-like classes pushes `symm` and `trans` to the right	This follows the usual convention for coercions. See discussion at [#mathlib4 > simp normal form for symm and coercions @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/simp.20normal.20form.20for.20symm.20and.20coercions/near/522879475) For each equiv class, after the PR we should have lemmas like ```lean @[simp] lemma coe_toEquiv (e : G ≃+c[a, b] H) : ⇑e.toEquiv = e := rfl @[simp] lemma coe_symm_toEquiv (e : G ≃+c[a, b] H) : ⇑e.toEquiv.symm = e.symm := rfl @[simp] lemma toEquiv_symm (e : G ≃+c[a, b] H) : e.symm.toEquiv = e.toEquiv.symm := rfl @[simp] lemma toEquiv_trans (e₁ : G ≃+c[a, b] H) (e₂ : H ≃+c[b, c] K) : (e₁.trans e₂).toEquiv = e₁.toEquiv.trans e₂.toEquiv := rfl ``` The PR does not complete this task, because it would require killing the coercion from EquivLike classes to Equivs (which I am planning to do in a subsequent PR), but it is a significant first step in this direction. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		196/64	Mathlib/Algebra/AddConstMap/Equiv.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/TwoDim.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Affine/MazurUlam.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Extension.lean,Mathlib/GroupTheory/Perm/Option.lean,Mathlib/LinearAlgebra/AffineSpace/AffineEquiv.lean,Mathlib/LinearAlgebra/AffineSpace/ContinuousAffineEquiv.lean,Mathlib/LinearAlgebra/RootSystem/IsValuedIn.lean,Mathlib/Logic/Equiv/Option.lean,Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Complex.lean,Mathlib/ModelTheory/Algebra/Field/IsAlgClosed.lean,Mathlib/NumberTheory/NumberField/Discriminant/Defs.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/WithTopBot.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Coalgebra/Equiv.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/PowerBasis.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/LinearPMap.lean,Mathlib/Topology/MetricSpace/DilationEquiv.lean,Mathlib/Topology/VectorBundle/Basic.lean	31	1	['github-actions']	nobody	0-83506 23 hours ago	0-83506 23 hours ago	0-84326 23 hours
25190	wwylele author:wwylele	feat(GroupTheory/Divisible): Add rational SMul and Module	This is part of #25140. A torsion-free ℕ-divisible commutative group is a ℚ-module. This new instance could collide with existing instances such as ℚ-module on ℝ that comes from `Algebra`. I don't know how much an issue this is. I set the new instance with low priority so hopefully it won't interfere existing instances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	127/0	Mathlib/Data/Rat/Lemmas.lean,Mathlib/GroupTheory/Divisible.lean	2	2	['eric-wieser', 'github-actions']	nobody	0-76373 21 hours ago	0-76373 21 hours ago	14-31640 14 days
25442	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure) : add a definition of total variation for VectorMeasure	This PR adds variation for any `VectorMeasure` using a supremum definition. Currently mathlib has `TotalVariation` defined for a signed measure using the Hahn-Jordan decomposition, but this doesn't generalise. Includes the result showing that for `SignedMeasure`s the two definitions coincide. Motivation: generally this is an important concept but specifically as a step for proving RMK in the complex case which in turn is a step to prove the spectral theorem. Co-authored-by: @yoh-tanimoto --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor RFC	664/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation.lean	2	4	['github-actions', 'grunweg', 'oliver-butterley']	nobody	0-37769 10 hours ago	0-38103 10 hours ago	0-38511 10 hours
25230	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): definition of cohen macaulay	In this PR, we added the definition of CM module, CM local ring (extending local ring), and CM ring. We also proved Theorem 30, Chater 6, _Commutative Algebra_, Matsumura. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	2211/37	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/Spectrum/Prime/LTSeries.lean,Mathlib/RingTheory/Support.lean	16	n/a	['github-actions', 'leanprover-community-bot-assistant']	nobody	0-25003 6 hours ago	unknown	unknown
25623	mattrobball author:mattrobball	feat: decidable equality for `Quiver.Path`	Given a quiver with decidable equality on its vertices and arrows, we construct an instance of decidable equality for `Quiver.Path`. We proceed through a recursion on the length of the path utilizing an intermediate subtype of uniformly bounded paths `Quiver.Path.BoundedPath`. This was motivated by doing computations on small quivers with Lean. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		69/0	Mathlib/Combinatorics/Quiver/Path.lean	1	1	['github-actions']	nobody	0-22514 6 hours ago	0-22603 6 hours ago	0-0 0 seconds
25619	xroblot author:xroblot	feat(NumberField/CMField): A totally complex abelian extension of ℚ is CM	--- - [ ] depends on: #23858 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	165/6	Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/LinearAlgebra/Dimension/Finrank.lean,Mathlib/NumberTheory/NumberField/CMField.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-19121 5 hours ago	0-35075 9 hours ago	0-118 1 minute
24853	smmercuri author:smmercuri	feat: dimensions of completions at infinite place extensions	Let `L / K` be an extension of number fields. For a fixed `v : InfinitePlace K`, we consider the infinite places `w` of `L` that extend `v`. The main results of this PR are: - `InfinitePlace.sum_ramificationIdx_eq`: the sum over all `w` extending `v` of the ramification indices of `w` over `K` is `[K : L]`. - `InfinitePlace.finrank_eq_ramificationIdx`: the `v.Completion`-dimension of `w.Completion` equals the ramification index of `w` over `K`. --- - [ ] depends on: #24870 - [ ] depends on: #24872 - [ ] depends on: #24873 - [ ] depends on: #24875 - [ ] depends on: #24877 - [x] depends on: #24879 - [ ] depends on: #24881 - [ ] depends on: #24882 - [ ] depends on: #24884 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import FLT merge-conflict blocked-by-other-PR	918/1	Mathlib.lean,Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/Data/Subtype.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Dimension.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean,Mathlib/Topology/Algebra/UniformRing.lean	8	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	26-16899 26 days ago	26-16901 26 days ago	0-1 1 second
24100	eric-wieser author:eric-wieser	feat: restore some explicit binders from Lean 3	Part of #24099 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt merge-conflict awaiting-author	39/42	Mathlib/Data/FinEnum.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Compactness/CompactlyGeneratedSpace.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/Metrizable/CompletelyMetrizable.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	10	3	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	15-21523 15 days ago	15-21525 15 days ago	34-33204 34 days
24881	smmercuri author:smmercuri	feat: `InfinitePlace.Extension` API for extensions of infinite places.	If `L / K` are fields and `v : InfinitePlace K`, then we define - `v.Extension L` : the subtype of `w : InfinitePlace L` whose restriction to `K` matches `v`. - `isExtension_or_isExtension_conjugate` : if `w` extends `v`, then either `w.embedding` extends `v.embedding` or `conjugate w.embedding` extends `v.embedding` - `IsLift`: class encoding the case where `w` extends `v` and `w.embedding` extends `v.embedding`. - `IsConjugateLift`: class encoding the case where `w` extends `v` and `conjugate w.embedding` extends `v.embedding`. --- - [ ] depends on: #24877 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	181/0	Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	5-7757 5 days ago	5-7758 5 days ago	0-1074 17 minutes

PRs with contradictory labels

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