The mathlib review queue

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This dashboard was last updated on: July 03, 2025 at 04:57 UTC

Review queue

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
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
73-44002
2 months ago
73-59062
2 months ago
73-59051
73 days
24405 mcdoll
author:mcdoll
refactor(Topology/Algebra/Module/WeakDual): Clean up - Move `Dual` and `dualPairing` lower in the import-hierachy - deduplicate `dualPairing` - Make `WeakDual` and `WeakSpace` reducible --- New version of #11500 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-topology 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
66-11274
2 months ago
66-19967
2 months ago
66-19949
66 days
20719 gio256
author:gio256
feat(AlgebraicTopology): delaborators for truncated simplicial notations We add delaborators for the following notations, introduced in #20688: - `⦋m⦌ₙ`, which denotes the `m`-dimensional simplex in the `n`-truncated simplex category. - `X _⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated simplicial object `X`. - `X ^⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated cosimplicial object `X`. If `pp.proofs` is set to `true`, we also pretty-print the proof `p : m ≤ n` for all three notations as `⦋m, p⦌ₙ`, `X _⦋m, p⦌ₙ`, and `X ^⦋m, p⦌ₙ`, respectively. Credit to @kmill for one piece of code and much metaprogramming inspiration. --- - [x] depends on: #20688 - [x] depends on: #23018 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 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
62-39011
2 months ago
62-41652
2 months ago
71-26793
71 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
61-8494
2 months ago
72-19875
2 months ago
72-19858
72 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
60-78031
1 month ago
60-78031
1 month ago
93-57753
93 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
60-45154
1 month ago
60-62224
1 month ago
62-30522
62 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
60-5253
1 month ago
129-6895
4 months ago
129-7019
129 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
55-78591
1 month ago
120-42836
3 months ago
120-42824
120 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
55-58063
1 month ago
76-30507
2 months ago
86-79323
86 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
54-61926
1 month ago
130-7025
4 months ago
130-7015
130 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
54-60053
1 month ago
79-61323
2 months ago
79-61376
79 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
54-59966
1 month ago
101-34640
3 months ago
149-54327
149 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
53-13955
1 month ago
53-13955
1 month ago
53-47401
53 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
52-43819
1 month ago
52-44071
1 month ago
52-46011
52 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
52-33227
1 month ago
52-39178
1 month ago
100-4998
100 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
52-3220
1 month ago
52-3220
1 month ago
75-27339
75 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
51-20958
1 month ago
71-65315
2 months ago
71-66139
71 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
50-79735
1 month ago
51-1975
1 month ago
51-2028
51 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
50-35662
1 month ago
52-48984
1 month ago
52-54460
52 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
49-81117
1 month ago
49-81124
1 month ago
49-81267
49 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
49-80896
1 month ago
49-80896
1 month ago
49-80943
49 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
49-77191
1 month ago
49-77191
1 month ago
49-77180
49 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
49-61110
1 month ago
49-70945
1 month ago
49-70927
49 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
49-57738
1 month ago
49-75041
1 month ago
61-12222
61 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
49-56265
1 month ago
49-56265
1 month ago
49-69594
49 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
49-56008
1 month ago
49-56008
1 month ago
134-29043
134 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
48-65226
1 month ago
48-66239
1 month ago
151-28343
151 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
48-43112
1 month ago
49-52943
1 month ago
49-69864
49 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
46-76135
1 month ago
46-76156
1 month ago
96-68709
96 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
45-70688
1 month ago
61-70328
2 months ago
61-78242
61 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
45-24567
1 month ago
45-24567
1 month ago
78-61250
78 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
44-41484
1 month ago
44-41608
1 month ago
44-45072
44 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
43-70795
1 month ago
43-70950
1 month ago
120-40078
120 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
43-67141
1 month ago
43-67161
1 month ago
118-25341
118 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
43-59887
1 month ago
43-64142
1 month ago
43-64125
43 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
43-42316
1 month ago
43-50071
1 month ago
43-51450
43 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
42-13705
1 month ago
70-11262
2 months ago
70-11315
70 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
41-56045
1 month ago
66-67647
2 months ago
70-55077
70 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
41-55896
1 month ago
77-67282
2 months ago
133-28003
133 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
41-24004
1 month ago
41-24004
1 month ago
42-3692
42 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
41-13512
1 month ago
41-13512
1 month ago
41-13565
41 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
40-68388
1 month ago
91-19473
3 months ago
96-46113
96 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
40-57378
1 month ago
40-57445
1 month ago
57-42468
57 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
40-48718
1 month ago
43-9220
1 month ago
43-9276
43 days
25071 erdOne
author:erdOne
feat(EllipticCurve): basic API for singular cubics --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebraic-geometry 320/0 Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean 3 34 ['Multramate', 'acmepjz', 'erdOne', 'github-actions'] nobody
40-5554
1 month ago
43-7377
1 month ago
43-7432
43 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
38-34973
1 month ago
38-34995
1 month ago
70-24953
70 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
37-42397
1 month ago
79-30695
2 months ago
79-30746
79 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
37-32852
1 month ago
43-9253
1 month ago
43-9249
43 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
36-58523
1 month ago
36-58540
1 month ago
114-80288
114 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
36-38638
1 month ago
89-17630
2 months ago
89-17649
89 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
36-28535
1 month ago
37-19947
1 month ago
37-20003
37 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
36-22177
1 month ago
36-22178
1 month ago
36-22232
36 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
36-2167
1 month ago
36-26610
1 month ago
36-28512
36 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
35-80125
1 month ago
39-45864
1 month ago
39-45847
39 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
35-74803
1 month ago
36-50745
1 month ago
42-55140
42 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
35-64912
1 month ago
38-73727
1 month ago
38-73780
38 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
35-38242
1 month ago
35-41891
1 month ago
35-41885
35 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
35-9516
1 month ago
35-12726
1 month ago
60-9685
60 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
34-71924
1 month ago
35-40064
1 month ago
35-40112
35 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
34-38914
1 month ago
34-38914
1 month ago
34-57298
34 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
33-14327
1 month ago
33-14327
1 month ago
74-53322
74 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
33-11364
1 month ago
33-21943
1 month ago
33-21995
33 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
32-43307
1 month ago
32-43326
1 month ago
35-42057
35 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
32-22753
1 month ago
35-25125
1 month ago
35-25109
35 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
31-59140
1 month ago
31-59218
1 month ago
31-59202
31 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
31-7577
1 month ago
32-17299
1 month ago
32-17289
32 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
30-62911
1 month ago
30-62911
1 month ago
133-16201
133 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
29-51231
29 days ago
44-55949
1 month ago
44-56296
44 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
28-66831
28 days ago
49-80421
1 month ago
49-80474
49 days
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
28-63255
28 days ago
29-22508
29 days ago
29-22491
29 days
25401 digama0
author:digama0
feat(Util): SuppressSorry option See also leanprover/lean4#8611 and [#lean4 > Silent sorry @ 💬](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Silent.20sorry/near/503537964). This is a stop-gap solution while leanprover/lean4#8611 is underway, but it works about as well as any other built in option. Hooking declaration elaborators turns out to be a very powerful technique. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 342/0 Mathlib.lean,Mathlib/Util/CommandElabHook.lean,Mathlib/Util/SuppressSorry.lean,MathlibTest/suppressSorry.lean 4 13 ['digama0', 'eric-wieser', 'github-actions'] nobody
28-13570
28 days ago
28-37904
28 days ago
29-48253
29 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
27-64558
27 days ago
28-32206
28 days ago
28-32259
28 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
27-53982
27 days ago
30-33954
1 month ago
34-43573
34 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
27-51994
27 days ago
27-58613
27 days ago
27-58666
27 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
27-1756
27 days ago
28-37680
28 days ago
28-39198
28 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
25-32788
25 days ago
25-32788
25 days ago
39-12210
39 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
24-75575
24 days ago
27-55122
27 days ago
27-55379
27 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
24-73944
24 days ago
24-73944
24 days ago
25-49476
25 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
24-61106
24 days ago
25-10006
25 days ago
25-10001
25 days
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
24-39270
24 days ago
24-39270
24 days ago
43-73083
43 days
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
24-24661
24 days ago
24-24661
24 days ago
24-36548
24 days
25573 JovanGerb
author:JovanGerb
feat: define `∃ x > y, ...` notation to mean `∃ x, y < x ∧ ...` This PR changes the elaboration of the binders `∃ x > y,` and `∀ x > y,` to use `<` instead of `>`, because we want to avoid working with `>` as much as possible (and similarly for `≥` vs `≤` ). The advantage is that we don't need to worry about rewriting with lemmas like `gt_iff_lt`. The disadvantage is that people might find this confusing. [#mathlib4 > naming convention for ≤ and < @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/naming.20convention.20for.20.E2.89.A4.20and.20.3C/near/522910464) The main changes are in `Mathlib.Init`, `Mathlib.Util.Delaborators` and `MathlibTest.delaborators`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 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
24-19957
24 days ago
24-20069
24 days ago
24-20057
24 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
24-11707
24 days ago
24-11729
24 days ago
30-5343
30 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
23-74045
23 days ago
53-68053
1 month ago
53-69118
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
23-71337
23 days ago
23-74033
23 days ago
23-74973
23 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
23-70587
23 days ago
39-21481
1 month ago
62-40183
62 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
23-70368
23 days ago
62-60568
2 months ago
63-10104
63 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
23-69858
23 days ago
23-69858
23 days ago
46-85948
46 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
23-56163
23 days ago
32-39460
1 month ago
32-39458
32 days
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
23-54304
23 days ago
24-61796
24 days ago
24-61779
24 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
23-49492
23 days ago
23-49511
23 days ago
41-45557
41 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
23-38664
23 days ago
23-38710
23 days ago
46-30790
46 days
24850 pechersky
author:pechersky
feat(Topology/UniformSpace/Ultra): uniform spaces induced by pseudometrics are ultra if system is ultra Any uniform space has a natural system of pseudometrics definable on it, comprised of those pseudometrics constructed from a descending chain of equivalence relation entourages. In a nonarchimedean uniformity, this pseudometric system induces the uniformity. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #23111 t-topology 509/1 Mathlib.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/UniformSpace/Ultra/Pseudometrizable.lean 3 8 ['ADedecker', 'fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'pechersky'] nobody
23-1429
23 days ago
23-1492
23 days ago
38-33429
38 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
22-58541
22 days ago
37-80902
1 month ago
38-18001
38 days
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 177/3 Mathlib.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/ENat/Pow.lean,Mathlib/Logic/Unique.lean,Mathlib/SetTheory/Cardinal/Finite.lean 5 7 ['D-Thomine', 'github-actions', 'sgouezel'] nobody
22-48309
22 days ago
25-22795
25 days ago
25-26716
25 days
22771 alreadydone
author:alreadydone
feat(Homotopy/Lifting): monodromy of covering maps 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
22-27518
22 days ago
105-67304
3 months ago
105-69198
105 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 350/21 Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Pointwise.lean,Mathlib/Topology/Covering/AddCircle.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Galois.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Instances/AddCircle/Defs.lean 9 17 ['ADedecker', 'alreadydone', 'digama0', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'tb65536'] nobody
21-52433
21 days ago
22-27404
22 days ago
71-21620
71 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 8 ['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant'] nobody
21-34043
21 days ago
21-34062
21 days ago
82-19786
82 days
19872 YaelDillies
author:YaelDillies
chore(GroupTheory/Index): rename `relindex` to `relIndex` --- - [x] depends on: #24044 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) FLT t-algebra
label:t-algebra$
255/192 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/NumberTheory/NumberField/Units/Regulator.lean,Mathlib/RingTheory/Ideal/Quotient/Index.lean 15 23 ['Ruben-VandeVelde', 'TwoFX', 'YaelDillies', 'alreadydone', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'loefflerd', 'madvorak', 'mathlib4-dependent-issues-bot', 'tb65536'] nobody
21-27545
21 days ago
22-51506
22 days ago
152-40853
152 days
25730 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/) --- *This PR continues the work from #22961.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/22961* t-algebra
label:t-algebra$
66/3 Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/GroupTheory/Index.lean,Mathlib/LinearAlgebra/Determinant.lean 4 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
20-81253
20 days ago
20-82344
20 days ago
20-82329
20 days
25732 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/) --- *This PR continues the work from #24711.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24711* 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 1 ['github-actions'] nobody
20-77810
20 days ago
20-77939
20 days ago
20-77925
20 days
25760 robin-carlier
author:robin-carlier
feat(CategoryTheory/Bicategory): (2,1)-categories and `Pith` This PR introduces a class `IsLocallyGroupoid` on bicategories, asserting that every hom-category has an `IsGroupoid` instance. With this definition, `IsLocallyGroupoid (LocallyDiscrete C)` is correctly inferred. Given a bicategory `B`, we introduce a type alias `Pith B` for `B` (realized as a one-field structure), and we equip it with a `Bicategory` instance where the hom-categories are the cores of the hom-categories of `B`. We show that this bicategory is a (2,1)-category, construct an inclusion pseudo-functor from `Pith B` to `B`, and show that every pseudofunctor from a (2,1)-category to `B` factors through this inclusion. --- We can’t fully state the fact that `(pseudofunctorToPith F).comp (inclusion F)` "is" `F` because #18254 is still not merged. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *This PR continues the work from #25150.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/25150* t-category-theory 191/0 Mathlib.lean,Mathlib/CategoryTheory/Bicategory/LocallyGroupoid.lean 2 1 ['github-actions'] nobody
20-72279
20 days ago
20-72352
20 days ago
20-72337
20 days
25779 robin-carlier
author:robin-carlier
feat(CategoryTheory/Bicategory/NaturalTransformations): strong and lax natural transformations of lax functors Given two lax functors `F G` between bicategories, we define lax natural transformations as families of 1-morphisms `∀ a : B, F.obj a ⟶ G.obj a` equipped with a naturality 2-cell `∀ {a b : B} (f : a ⟶ b), app a ≫ G.map f ⟶ F.map f ≫ app b` that are required to satisfy conditions such as naturality, and compatibility with the `mapId` and `mapComp` fields of the source and target functors. This notion dualizes the existing notion of oplax natural transformations between, and tries to narrow the current gap between lax and oplax functors in the library, where the latter has much more formalized API. For maintainability, The code tries to stay as aligned as possible with the code in `CategoryTheory.Bicategory.Naturaltransformations.Oplax`. --- I followed the book by Johnson and Yau for the definition. I made @yuma-mizuno and @callesonne authors of the files, as they are the authors of the original code for Oplax functors, which I basically copy-pasted and modified to make it work with lax functors. They should feel free to modify this if they want. Next thing on the list is to tackle modifications between lax/strong natural transforms of lax transforms, as well as the category instance on lax functors. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *This PR continues the work from #25565.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/25565* t-category-theory 286/0 Mathlib.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Lax.lean,scripts/noshake.json 3 1 ['github-actions'] nobody
20-68588
20 days ago
20-68653
20 days ago
20-68638
20 days
25776 Parcly-Taxel
author:Parcly-Taxel
chore: deprime `induction` in `Analysis` I think this is very marginally dependent on #25770. tech debt t-analysis 256/208 Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/BoxIntegral/Basic.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/InverseFunctionTheorem/ApproximatesLinearOn.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/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.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/Integrals.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/EulerSineProd.lean 35 2 ['Parcly-Taxel', 'github-actions'] nobody
20-68432
20 days ago
20-68865
20 days ago
20-68909
20 days
25736 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/) --- *This PR continues the work from #21745.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/21745* large-import t-topology t-category-theory 253/7 Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean 1 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
20-67852
20 days ago
20-77542
20 days ago
20-77530
20 days
25786 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
20-67851
20 days ago
20-67919
20 days ago
20-67904
20 days
25790 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
20-67108
20 days ago
20-67207
20 days ago
20-67195
20 days
25794 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/) --- *This PR continues the work from #24485.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24485* 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 1 ['github-actions'] nobody
20-65895
20 days ago
20-65967
20 days ago
20-65952
20 days
25795 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/) --- *This PR continues the work from #24522.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24522* t-condensed 39/0 Mathlib.lean,Mathlib/Condensed/Light/Small.lean 2 1 ['github-actions'] nobody
20-65737
20 days ago
20-65802
20 days ago
20-65787
20 days
25804 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/) --- *This PR continues the work from #21673.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/21673* t-analysis 319/0 Mathlib.lean,Mathlib/Algebra/BigOperators/Group/Finset/Disjoint.lean,Mathlib/Algebra/Module/ZLattice/Summable.lean,Mathlib/Order/Disjointed.lean 4 1 ['github-actions'] nobody
20-56313
20 days ago
20-63012
20 days ago
20-62997
20 days
25774 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 133/124 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
20-55077
20 days ago
20-69314
20 days ago
20-69299
20 days
25788 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 2 ['YaelDillies', 'github-actions'] nobody
20-54815
20 days ago
20-67768
20 days ago
20-67755
20 days
24931 qawbecrdtey
author:qawbecrdtey
feat(Data/Nat/Sqrt): Added lemma `Nat.add_one_sqrt_le_of_ne_zero` --- This commit proves a single lemma `Nat.add_one_sqrt_le_of_ne_zero`. ```lean lemma add_one_sqrt_le_of_ne_zero {n : ℕ} (hn : n ≠ 0) : (n + 1).sqrt ≤ n ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data easy 4/0 Mathlib/Data/Nat/Sqrt.lean 1 8 ['Ruben-VandeVelde', 'adomani', 'eric-wieser', 'github-actions', 'kckennylau', 'qawbecrdtey'] nobody
20-54174
20 days ago
48-69686
1 month ago
48-69743
48 days
25724 bryangingechen
author:bryangingechen
chore: disable scheduled runs of stale issues workflow There's no point in having this run on schedule while it's still in limbo. --- This also seems to have been [completely broken](https://github.com/leanprover-community/mathlib4/actions/workflows/stale.yml) since #21681, since the search string is too long. Maybe we should just delete this. CI 1/2 .github/workflows/stale.yml 1 1 ['github-actions'] nobody
20-53110
20 days ago
21-3579
21 days ago
21-3563
21 days
25829 kbuzzard
author:kbuzzard
feat: add mulEquivHaarChar API for the positive real factor by which an continuous multiplicative equivalence scales a regular Haar measure on a locally compact topological group. From FLT. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-measure-probability 158/0 Mathlib.lean,Mathlib/MeasureTheory/Group/Measure.lean,Mathlib/MeasureTheory/Measure/Haar/MulEquivHaarChar.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean 4 1 ['github-actions'] nobody
20-19520
20 days ago
20-20484
20 days ago
20-20530
20 days
9820 jjaassoonn
author:jjaassoonn
feat(RingTheory/GradedAlgebra/HomogeneousIdeal): generalize to homogeneous submodule The definitions, constructions and theorems in `HomogeneousIdeal.lean` are generalized to a homogeneous submodules. So say $R$ is a ring and $M \cong \bigoplus_{i} M_i$ is an $R$-module. Then a homogeneous $R$-submodule of $M$ is an $R$-submodule $N$ such that for all $i$ and $n \in N$, $n_i \in N$. Note that this notion doesn't actually require $R$ to be graded and $M$ is a graded module. But for more interesting lemmas, we do need that $M$ is graded $R$-module. We bake the fact $R$ is graded into the definition of homogeneous submodule, otherwise, `CompleteLattice HomogeneousSubmodule` cannot find the order of synthesis (the proof depends on that $R$ is graded) All definitions/constructions/theorems have a copy for ideals as well, this is to make sure dot notation still works. The motivation of this generalization is graded quotient module --- - [ ] depends on:#18728 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
516/185 Mathlib/Algebra/Module/GradedModule.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,scripts/nolints_prime_decls.txt 7 2 ['github-actions'] nobody
20-14635
20 days ago
140-12718
4 months ago
170-63857
170 days
25830 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`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *This PR continues the work from #24498.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24498* t-algebra
label:t-algebra$
33/13 Mathlib/RingTheory/HahnSeries/HEval.lean 1 1 ['github-actions'] nobody
20-5137
20 days ago
20-6010
20 days ago
20-5995
20 days
25836 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/) --- *This PR continues the work from #25313.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/25313* large-import t-combinatorics 307/4 Mathlib/Combinatorics/SimpleGraph/FiveWheelLike.lean 1 1 ['github-actions'] nobody
19-69424
19 days ago
19-70273
19 days ago
19-70261
19 days
25842 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/) --- *This PR continues the work from #20171.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/20171* t-combinatorics 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 2 ['github-actions', 'mathlib4-dependent-issues-bot'] b-mehta
assignee:b-mehta
19-50077
19 days ago
19-50077
19 days ago
19-55212
19 days
25680 kim-em
author:kim-em
chore: remove some `Nat` shortcut instances This PR continues the work from #24928. Original PR: https://github.com/leanprover-community/mathlib4/pull/24928 0/9 Mathlib/Algebra/Ring/Divisibility/Basic.lean,Mathlib/Data/List/TakeDrop.lean,Mathlib/Data/Nat/Basic.lean 3 10 ['b-mehta', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mattrobball'] nobody
19-49426
19 days ago
22-18537
22 days ago
22-18520
22 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
label:t-algebra$
21/23 Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/LinearAlgebra/RootSystem/Irreducible.lean,Mathlib/LinearAlgebra/RootSystem/RootPositive.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/RingTheory/Localization/InvSubmonoid.lean,Mathlib/RingTheory/OreLocalization/Basic.lean 14 2 ['eric-wieser', 'github-actions'] nobody
19-23260
19 days ago
19-23260
19 days ago
19-48125
19 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$
65/12 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
18-64461
18 days ago
37-73785
1 month ago
38-64425
38 days
25856 MichaelStollBayreuth
author:MichaelStollBayreuth
perf(Data.Real.Sqrt): make Real.sqrt irreducible We try to see what happens if we make Real.sqrt irreducible. There are cases where this makes unification very significantly faster, compare [#mathlib4 > Coercion triggers timeout @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Coercion.20triggers.20timeout/near/517177117). (Migrated manually from #24752) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated-from-branch t-data 1/0 Mathlib/Data/Real/Sqrt.lean 1 1 ['github-actions'] nobody
18-58957
18 days ago
18-58957
18 days ago
18-62663
18 days
25864 plp127
author:plp127
feat(Nat/Digits): use fuel in `Nat.digits` Add a `fuel` parameter to `Nat.digitsAux` to make it structurally recursive. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 49/14 Mathlib/Data/Nat/Digits.lean 1 1 ['github-actions'] nobody
18-31794
18 days ago
18-48710
18 days ago
18-48757
18 days
25770 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 134/115 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/SuccPred/Archimedean.lean,Mathlib/Order/Synonym.lean 15 10 ['Parcly-Taxel', 'eric-wieser', 'github-actions'] nobody
17-76293
17 days ago
20-71139
20 days ago
20-71124
20 days
25851 kmill
author:kmill
feat: improve quality of proofs generated by `congr(...)`, add caching, add support for overapplied functions This PR makes the following improvements to the `congr(...)` term elaborator: - It now uses `congr`/`congrFun` as much as possible instead of creating giant HEq-based congruence proofs. - It now looks for common prefixes for applications, to skip unnecessary work proving that these parts of an application are equal. - Intermediate results are cached. - Overapplied functions are now supported. An overapplied function is a function with more arguments than the arity of the function itself. For example, in `id id 2` the first `id is overapplied. The return type is conditionally a pi type depending on the values of the arguments. Fixes Jz Pan's issue reported [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Strange.20error.20on.20.60congr.60.20macro/near/523998660). Modifies a couple uses of `congr(...)` in `SimplicialSet.NerveAdjunction` to take more advantage of it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 291/140 Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/Tactic/TermCongr.lean,MathlibTest/TermCongr.lean 3 15 ['acmepjz', 'eric-wieser', 'github-actions', 'grunweg', 'kmill'] nobody
17-75426
17 days ago
19-19272
19 days ago
19-19255
19 days
25899 pfaffelh
author:pfaffelh
feat(Topology/Compactness/CompactSystem): introduce compact Systems A compact system is a set systems with the property that, whenever a countable intersections of sets in the set system is empty, there is a finite subset of sets with empty intersection. These are needed e.g. in measure theory if one wants to show sigma-additivity of a set function on a ring. * Main result: The set of sets which are either compact and closed, or `univ`, is a compact system. * Introduce `Dissipate s x := ⋂ y ≤ x, s y` (Data/Set/Dissipate), which is parallel to Data/Set/Accumulate. Co-authored-by: Rémy Degenne remydegenne@gmail.com --- *This PR continues the work from #24541.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24541* 453/2 Mathlib.lean,Mathlib/Data/Set/Accumulate.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/Topology/Compactness/CompactSystem.lean 5 1 ['github-actions'] nobody
17-61822
17 days ago
17-61890
17 days ago
17-61873
17 days
25932 Garmelon
author:Garmelon
chore: remove acceptSuggestionOnEnter option Reverts #12749. Discussion on zulip: [#mathlib4 > propose removing module docstring code suggestion @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/propose.20removing.20module.20docstring.20code.20suggestion/near/452477171) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 0/1 .vscode/settings.json 1 1 ['github-actions'] nobody
17-37792
17 days ago
17-37863
17 days ago
17-37855
17 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 58 ['AntoineChambert-Loir', 'Louddy', 'github-actions', 'kbuzzard'] nobody
16-63218
16 days ago
49-71199
1 month ago
122-5328
122 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$
93/0 Mathlib/FieldTheory/RatFunc/AsPolynomial.lean 1 29 ['Louddy', 'faenuccio', 'github-actions', 'mariainesdff'] nobody
16-54749
16 days ago
48-65876
1 month ago
50-66796
50 days
25889 plp127
author:plp127
fix(Tactic/Widget/Conv): fix various issues Fixes various issues with the `conv?` widget. Closes #25162. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 110/83 Mathlib/Tactic/Widget/Conv.lean 1 1 ['github-actions'] nobody
16-53752
16 days ago
18-7800
18 days ago
18-7847
18 days
25966 b-reinke
author:b-reinke
feat(GroupTheory/FreeGroup/ReducedWords): add theory of reduced words This PR continues the work from #23368. Original PR: https://github.com/leanprover-community/mathlib4/pull/23368 t-algebra
label:t-algebra$
104/0 Mathlib.lean,Mathlib/GroupTheory/FreeGroup/ReducedWords.lean 2 2 ['b-reinke', 'github-actions'] nobody
16-47557
16 days ago
16-47567
16 days ago
16-47617
16 days
25965 b-reinke
author:b-reinke
feat(Algebra/BigOperators/Finprod): add powerset projection lemmas This PR continues the work from #23926. Original PR: https://github.com/leanprover-community/mathlib4/pull/23926 30/0 Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Set/Image.lean 2 2 ['b-reinke', 'github-actions'] joelriou
assignee:joelriou
16-42950
16 days ago
16-48291
16 days ago
16-48274
16 days
25931 joelriou
author:joelriou
refactor(CategoryTheory): redefine triangulated subcategories using ObjectProperty --- This PR continues the work from #24191. Original PR: https://github.com/leanprover-community/mathlib4/pull/24191 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 2 ['github-actions', 'joelriou'] nobody
16-34273
16 days ago
17-38430
17 days ago
17-38413
17 days
25988 Multramate
author:Multramate
refactor(AlgebraicGeometry/EllipticCurve/*): replace Fin 3 with products This PR continues the work from #24593. Original PR: https://github.com/leanprover-community/mathlib4/pull/24593 t-algebraic-geometry 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 2 ['Multramate', 'github-actions'] nobody
16-23985
16 days ago
16-23988
16 days ago
16-24039
16 days
25992 Multramate
author:Multramate
feat(RingTheory/Ideal/Span): add pair lemmas This PR continues the work from #25323. Original PR: https://github.com/leanprover-community/mathlib4/pull/25323 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 2 ['Multramate', 'github-actions'] nobody
16-23594
16 days ago
16-23669
16 days ago
16-23652
16 days
25999 bjoernkjoshanssen
author:bjoernkjoshanssen
feat(Topology/Compactification): projective line over ℝ is homeomorphic to the one-point compactification of ℝ This PR continues the work from #18306. Original PR: https://github.com/leanprover-community/mathlib4/pull/18306 t-topology 920/0 Mathlib.lean,Mathlib/Topology/Compactification/OnePointHomeomorph.lean,Mathlib/Topology/Compactification/OnePointRealLemmas.lean 3 2 ['bjoernkjoshanssen', 'github-actions'] nobody
16-3948
16 days ago
16-3966
16 days ago
16-4012
16 days
26009 linesthatinterlace
author:linesthatinterlace
feat: Add `Vector`/`List.Vector` equivalence This PR continues the work from #25050. Original PR: https://github.com/leanprover-community/mathlib4/pull/25050 migrated-from-branch 125/17 Mathlib/Data/Vector/Basic.lean,Mathlib/Data/Vector/Defs.lean,Mathlib/Logic/Equiv/Array.lean 3 2 ['github-actions', 'linesthatinterlace'] nobody
15-68637
15 days ago
15-68637
15 days ago
15-71164
15 days
26011 linesthatinterlace
author:linesthatinterlace
feat: add elementary lifts for `OneHom`, `MulHom`, `MonoidHom` and `RingHom`. This PR continues the work from #25264. Original PR: https://github.com/leanprover-community/mathlib4/pull/25264 migrated-from-branch t-algebra
label:t-algebra$
414/10 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 2 ['github-actions', 'linesthatinterlace'] nobody
15-68619
15 days ago
15-68619
15 days ago
15-70981
15 days
26012 linesthatinterlace
author:linesthatinterlace
feat: Low-level derivatives of lifts on `OneHom`, `MulHom` and `MonoidHom` This PR continues the work from #25290. Original PR: https://github.com/leanprover-community/mathlib4/pull/25290 migrated-from-branch t-algebra
label:t-algebra$
785/34 Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Ring/Hom/Basic.lean,Mathlib/Algebra/Ring/Hom/Defs.lean 5 2 ['github-actions', 'linesthatinterlace'] nobody
15-68612
15 days ago
15-68612
15 days ago
15-70928
15 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
15-56831
15 days ago
32-66305
1 month ago
32-66297
32 days
26029 joelriou
author:joelriou
feat(CategoryTheory/Localization): the right derivability structure given by functorial resolutions This PR continues the work from #22586. Original PR: https://github.com/leanprover-community/mathlib4/pull/22586 t-category-theory 153/0 Mathlib.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/OfFunctorialResolutions.lean,Mathlib/CategoryTheory/Localization/LocalizerMorphism.lean 3 2 ['github-actions', 'joelriou'] nobody
15-55536
15 days ago
15-55733
15 days ago
15-55778
15 days
25854 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`. --- - [x] depends on: #25826 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/) --- *This PR continues the work from #25626.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/25626* t-category-theory 112/0 Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Opposite/Mon_.lean 2 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
15-43831
15 days ago
17-41774
17 days ago
17-41759
17 days
25767 robin-carlier
author:robin-carlier
feat(CategoryTheory/Monoidal/Opposite): the equivalence `Cᴹᵒᵖᴹᵒᵖ ≌ C` is monoidal It was left as a TODO in #10415 that the equivalence `Cᴹᵒᵖᴹᵒᵖ ≌ C` is monoidal. We clear this todo. --- - [x] depends on: #25766 This used to be a very low-hanging fruit. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *This PR continues the work from #25628.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/25628* t-category-theory 28/1 Mathlib/CategoryTheory/Monoidal/Opposite.lean 1 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
15-43167
15 days ago
17-41761
17 days ago
17-41746
17 days
26054 FMLJohn
author:FMLJohn
feat(RingTheory/GradedAlgebra/Homogeneous/Subsemiring): homogeneous subsemirings of a graded semiring --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) In this pull request, we have defined homogeneous subsemirings of `GradedRing 𝒜` where `𝒜 : ι → σ`, `SetLike σ A` and `AddSubmonoidClass σ A`. ## Main definitions For any `R : Subsemiring A`: * `Subsemiring.IsHomogeneous 𝒜 R`: The property that a subsemiring is closed under `GradedRing.proj`. * `HomogeneousSubsemiring 𝒜`: The structure extending subsemirings which satisfy `Subsemiring.IsHomogeneous`. t-algebra
label:t-algebra$
120/0 Mathlib.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Subsemiring.lean 2 1 ['github-actions'] nobody
15-37263
15 days ago
15-38235
15 days ago
15-38220
15 days
26067 mapehe
author:mapehe
feat(Topology/StoneCech): exists_continuous_surjection_from_StoneCech_to_dense_range This lemma formalises the following version of the maximality property of the Stone–Čech compactification: If `f : α → β` is a continuous map from a topological space `α` to a Hausdorff space `β` with dense range, then there exists a continuous surjection from `StoneCech α` to `β` extending `f`. In particular, `StoneCech α` is the “largest” compact Hausdorff space into which `α` densely embeds, in the sense that any other such space is a continuous image of it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 18/0 Mathlib/Topology/StoneCech.lean 1 1 ['github-actions'] nobody
14-78439
14 days ago
14-78464
14 days ago
14-78519
14 days
26076 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`. --- This PR continues the work from #21103. Original PR: https://github.com/leanprover-community/mathlib4/pull/21103 t-topology 118/5 Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean 2 2 ['github-actions', 'joelriou'] nobody
14-70769
14 days ago
14-70780
14 days ago
14-70828
14 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 15 ['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'smorel394'] nobody
14-69765
14 days ago
38-34326
1 month ago
38-38249
38 days
26080 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) --- Original PR: https://github.com/leanprover-community/mathlib4/pull/25094 t-meta 76/36 Mathlib/Tactic/Positivity/Core.lean,MathlibTest/positivity.lean 2 3 ['YaelDillies', 'github-actions', 'grunweg'] nobody
14-55975
14 days ago
14-58531
14 days ago
14-58625
14 days
26099 grunweg
author:grunweg
feat: add 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 is used in my bordism theory project. Co-authored by: @plp127 --- This PR was manually re-created (and migrated to a fork at the same time) from #22137, since that seemed easiest. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-topology 115/0 Mathlib/Data/Sum/Basic.lean,Mathlib/Topology/Constructions/SumProd.lean 2 1 ['github-actions'] nobody
14-51669
14 days ago
14-51729
14 days ago
14-51722
14 days
25762 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. --- - [x] depends on: #25761 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *This PR continues the work from #25545.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/25545* t-category-theory 203/113 Mathlib/CategoryTheory/Monoidal/Cartesian/Mod_.lean,Mathlib/CategoryTheory/Monoidal/Mod_.lean 2 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
14-50670
14 days ago
14-50670
14 days ago
1-18084
1 day
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$
116/5 Mathlib.lean,Mathlib/Algebra/Category/CommAlgCat/Basic.lean,Mathlib/Algebra/Category/CommAlgCat/Monoidal.lean 3 52 ['YaelDillies', 'erdOne', 'github-actions', 'robin-carlier'] nobody
14-48481
14 days ago
30-58814
1 month ago
30-59966
30 days
26122 chrisflav
author:chrisflav
refactor(CategoryTheory/CoproductDisjoint): generalize to indexed coproducts We replace the currently existing `CoproductDisjoint` by a predicate for a family of objects, indicating that the pairwise pullbacks are disjoint and the coproduct inclusions are monomorphisms. The old predicate is recovered as `BinaryCoproductDisjoint` as an `abbrev`. We also replace `CoproductsDisjoint` by `CoproductsOfShapeDisjoint` and `BinaryCoproductsDisjoint`. We postpone the TODO to show that if binary coproducts are disjoint and suitable coproducts exist, then all coproducts of suitable shape are disjoint. Note that `CoproductDisjoint` changed its meaning, so no deprecation can be added. This should be fine, since it is a leaf file that is hopefully not much used downstream. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60MonoCoprod.60.20and.20.60DisjointCoproduct.60/with/524752624 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 198/89 Mathlib/CategoryTheory/Limits/Shapes/DisjointCoproduct.lean 1 1 ['github-actions'] nobody
14-30055
14 days ago
14-31336
14 days ago
14-31320
14 days
25949 themathqueen
author:themathqueen
feat(LinearAlgebra/Basis/MulOpposite): basis of an opposite space This adds the definition of `Basis.mulOpposite` and shows finite-dimensionality and freeness of `Hᵐᵒᵖ`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
48/0 Mathlib.lean,Mathlib/LinearAlgebra/Basis/MulOpposite.lean 2 1 ['github-actions'] nobody
14-29245
14 days ago
16-69554
16 days ago
16-69600
16 days
25874 themathqueen
author:themathqueen
feat(LinearAlgebra/InvariantSubmodule): invariant submodules Defining and proving some lemmas on invariant submodules. This is a (2-year late) port from leanprover-community/mathlib3#18289. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
176/0 Mathlib.lean,Mathlib/Algebra/Group/Commute/Units.lean,Mathlib/LinearAlgebra/GeneralLinearGroup.lean,Mathlib/LinearAlgebra/InvariantSubmodule.lean,Mathlib/LinearAlgebra/Projection.lean 5 1 ['github-actions'] nobody
14-28159
14 days ago
18-41785
18 days ago
18-41832
18 days
25858 themathqueen
author:themathqueen
feat(RingTheory/Coalgebra/MulOpposite): coalgebra instance for MulOpposite Adding an instance for `Aᵐᵒᵖ` being an `R`-coalgebra when `A` is. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
112/0 Mathlib.lean,Mathlib/RingTheory/Coalgebra/MulOpposite.lean 2 1 ['github-actions'] nobody
14-25436
14 days ago
18-57235
18 days ago
18-57281
18 days
26110 YaelDillies
author:YaelDillies
feat: sharp monoids Define sharp monoids, which are the monoids whose only unit is `1`. This concept is useful in log geometry and in particular shows up in the theory of affine monoids. This concept already existed in the guise of `Subsingleton Mˣ`, but giving it a name makes it easier to refer to and uncovers some missing instances. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-algebra
label:t-algebra$
51/30 Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Irreducible/Defs.lean,Mathlib/Algebra/Group/Pi/Units.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Submonoid/Units.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Associated.lean,Mathlib/Algebra/GroupWithZero/Divisibility.lean,Mathlib/Data/List/Prime.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/NumberTheory/DirichletCharacter/Basic.lean,Mathlib/RingTheory/ChainOfDivisors.lean,Mathlib/RingTheory/IntegralDomain.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean,Mathlib/RingTheory/Valuation/Integers.lean 18 1 ['b-mehta', 'github-actions'] nobody
13-69524
13 days ago
14-46183
14 days ago
14-46236
14 days
26074 oliver-butterley
author:oliver-butterley
feat(Mathlib.Dynamics.BirkhoffSum): add 2 lemmas for birkhoffSum/birkhoffAverage concerning ae_eq observables If two observables are `ae_eq` then the birkhoffSum/birkhoffAverage of those observables are `ae_eq`. Motivation: - Generally it is useful to be able to swap to observables which are `ae_eq`. - Specifically this is useful to prove Birkhoff's pointwise ergodic theorem by first proving the result for integrable and measurable observables and then using this to deduce the result with just the requirement of integrable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-dynamics 44/0 Mathlib.lean,Mathlib/Dynamics/BirkhoffSum/QuasiMeasurePreserving.lean 2 10 ['github-actions', 'oliver-butterley', 'sgouezel'] nobody
13-69368
13 days ago
14-72876
14 days ago
14-72920
14 days
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 720/641 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/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/Combinatorics/SimpleGraph/Bipartite.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/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 56 11 ['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
13-69331
13 days ago
13-76967
13 days ago
37-48383
37 days
26141 kebekus
author:kebekus
feat: compute trailing coefficients of factorized rational functions This PR continues the work from #25523. Original PR: https://github.com/leanprover-community/mathlib4/pull/25523 t-analysis 180/3 Mathlib/Analysis/Meromorphic/FactorizedRational.lean,Mathlib/Analysis/Meromorphic/TrailingCoefficient.lean 2 3 ['github-actions', 'kebekus'] nobody
13-65953
13 days ago
13-66017
13 days ago
13-66505
13 days
26142 YaelDillies
author:YaelDillies
chore(GeomSum): split into ring vs field and non-ordered vs ordered parts The motivation here is that `Data.Nat.Multiplicity` needs the results about geometric sums of naturals, without wanting to know anyrthing about fields. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
708/638 Archive/Imo/Imo1982Q3.lean,Archive/Imo/Imo2013Q5.lean,Archive/Wiedijk100Theorems/PerfectNumbers.lean,Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib.lean,Mathlib/Algebra/Field/GeomSum.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Field/GeomSum.lean,Mathlib/Algebra/Order/Ring/GeomSum.lean,Mathlib/Algebra/Ring/GeomSum.lean,Mathlib/Analysis/Polynomial/CauchyBound.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Combinatorics/Colex.lean,Mathlib/Combinatorics/SetFamily/KruskalKatona.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/LinearAlgebra/Projectivization/Cardinality.lean,Mathlib/LinearAlgebra/Vandermonde.lean,Mathlib/NumberTheory/Basic.lean,Mathlib/NumberTheory/FactorisationProperties.lean,Mathlib/NumberTheory/MulChar/Basic.lean,Mathlib/NumberTheory/Multiplicity.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Index.lean,Mathlib/RingTheory/Idempotents.lean,Mathlib/RingTheory/IntegralDomain.lean,Mathlib/RingTheory/Nilpotent/Basic.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/Tactic/NormNum/Irrational.lean 30 1 ['github-actions'] nobody
13-64274
13 days ago
13-64274
13 days ago
13-64269
13 days
26154 ADedecker
author:ADedecker
refactor: add refactored APIs for algebraic filter bases This PR continues the work from #18437. Original PR: https://github.com/leanprover-community/mathlib4/pull/18437 t-topology 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 2 ['ADedecker', 'github-actions'] nobody
13-58746
13 days ago
13-58746
13 days ago
13-58806
13 days
26137 xroblot
author:xroblot
feat(NumberField): specialized version of Kummer Dedekind for the splitting of prime numbers (part 1) First part of the Kummer-Dedekind isomorphism for the splitting of rational prime numbers in number fields. We define the `exponent` of an algebraic integer `θ` and define the isomorphism between `(ℤ / pℤ)[X] / (minpoly θ)` and `𝓞 K / p(𝓞 K)` for primes `p` which doesn't divide the exponent of `θ`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-number-theory 133/0 Mathlib.lean,Mathlib/NumberTheory/NumberField/Ideal/KummerDedekind.lean,Mathlib/Order/Atoms.lean,Mathlib/RingTheory/Ideal/Span.lean 4 1 ['github-actions'] nobody
13-57247
13 days ago
13-57247
13 days ago
13-76001
13 days
26157 erdOne
author:erdOne
chore(RingTheory): Merge `Mathlib/RingTheory/LocalRing/ResidueField/Algebraic.lean` into `Instances.lean` This was added a week ago by myself so I don't think a deprecation is needed --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) file-removed 22/34 Mathlib.lean,Mathlib/NumberTheory/RamificationInertia/Unramified.lean,Mathlib/RingTheory/LocalRing/ResidueField/Algebraic.lean,Mathlib/RingTheory/LocalRing/ResidueField/Instances.lean 4 1 ['github-actions'] nobody
13-54348
13 days ago
13-54509
13 days ago
13-54563
13 days
26159 upobir
author:upobir
feat(Algebra/QuadraticDiscriminant): Adding inequalities on quadratic from inequalities on discriminant This PR continues the work from #24517. Original PR: https://github.com/leanprover-community/mathlib4/pull/24517 t-algebra
label:t-algebra$
35/0 Mathlib/Algebra/QuadraticDiscriminant.lean 1 3 ['github-actions', 'upobir'] nobody
13-53054
13 days ago
13-53490
13 days ago
13-53535
13 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 --- - [x] depends on: #25291 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-convex-geometry toric 99/32 Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Geometry/Convex/Cone/Basic.lean 2 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
13-52435
13 days ago
13-66860
13 days ago
13-67533
13 days
25002 YaelDillies
author:YaelDillies
chore(Finsupp): move order properties under `Order` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import 357/323 Mathlib.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/Order/Floor/Div.lean,Mathlib/Data/Finsupp/Ext.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Finsupp/PWO.lean,Mathlib/Data/Finsupp/Pointwise.lean,Mathlib/Data/Finsupp/SMulWithZero.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/Finsupp/Weight.lean,Mathlib/Data/List/ToFinsupp.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/Data/Nat/Factorization/Defs.lean,Mathlib/Order/Preorder/Finsupp.lean 16 6 ['github-actions', 'leanprover-community-bot-assistant'] nobody
13-51681
13 days ago
13-63257
13 days ago
13-64114
13 days
24149 YaelDillies
author:YaelDillies
refactor(Convex/Cone): streamline duality 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 - [x] depends on: #24304 - [x] depends on: #25204 - [x] depends on: #25251 - [x] depends on: #25252 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-analysis 395/206 Mathlib.lean,Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Analysis/Convex/Cone/Dual.lean,Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Geometry/Convex/Cone/Dual.lean,Mathlib/Geometry/Convex/Cone/README.md 6 14 ['YaelDillies', 'github-actions', 'justus-springer', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
13-51552
13 days ago
13-52677
13 days ago
15-49602
15 days
26170 linesthatinterlace
author:linesthatinterlace
feat: Add definition of `symmEquiv` Ad an equivalence version of `Equiv.symm` and similar operations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 19/0 Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Logic/Equiv/Defs.lean 3 3 ['github-actions', 'plp127'] nobody
13-31665
13 days ago
13-49756
13 days ago
13-49739
13 days
26156 oliver-butterley
author:oliver-butterley
feat(MeasureTheory.VectorMeasure) : add a definition of total variation for VectorMeasure This PR adds variation for any `VectorMeasure` using a supremum definition. Currently mathlib has `TotalVariation` defined for a signed measure using the Hahn-Jordan decomposition, but this doesn't generalise. Motivation: generally this is an important concept but specifically as a step for proving RMK in the complex case which in turn is a step to prove the spectral theorem. Co-authored-by: @yoh-tanimoto This PR was migrated from #25442. PR divided into smaller pieces, this is just the definition without additional lemmas. PRs adding further results related to variation are: * #26160 * #26165 * #26168 (shows that for `SignedMeasures` the two definitions of variation coincide) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 354/0 Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean 2 1 ['github-actions'] nobody
12-74816
12 days ago
13-55833
13 days ago
13-55883
13 days
26160 oliver-butterley
author:oliver-butterley
feat(MeasureTheory.VectorMeasure): add several lemmas which characterize variation Add the following lemmas concerning variation of a VectorMeasure: * `norm_measure_le_variation`: `‖μ E‖ₑ ≤ variation μ E`. * `variation_neg`: `(-μ).variation = μ.variation`. * `variation_zero`: `(0 : VectorMeasure X V).variation = 0`. * `absolutelyContinuous` Co-authored-by: @yoh-tanimoto Depends on * #26156 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 432/0 Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean 3 1 ['github-actions'] nobody
12-74760
12 days ago
13-53415
13 days ago
13-53467
13 days
26165 oliver-butterley
author:oliver-butterley
feat(MeasureTheory.VectorMeasure): add lemma which shows that variation of a `ℝ≥0∞` VectorMeasure is equal to itself Add a lemma for the variation of a VectorMeasure which tells that if `μ` is `VectorMeasure X ℝ≥0∞` then `variation μ = μ`. Co-authored-by: @yoh-tanimoto Depends on * #26160 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 467/0 Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean 3 1 ['github-actions'] nobody
12-74739
12 days ago
13-50811
13 days ago
13-50858
13 days
26168 oliver-butterley
author:oliver-butterley
feat(MeasureTheory.VectorMeasure) : variation defined as a supremum is equal to variation defined using the Hahn-Jordan decomposition. Add `signedMeasure_totalVariation_eq`: if `μ` is a `SignedMeasure` then variation defined as a supremum is equal to variation defined using the Hahn-Jordan decomposition. Co-authored-by: @yoh-tanimoto Depends on: * #26165 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 680/0 Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Equiv.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean 4 1 ['github-actions'] nobody
12-74725
12 days ago
13-49949
13 days ago
13-49997
13 days
26199 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. Original PR: https://github.com/leanprover-community/mathlib4/pull/24112 t-algebra
label:t-algebra$
5/1 Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/RingTheory/Ideal/Defs.lean 2 2 ['Vierkantor', 'github-actions'] nobody
12-70743
12 days ago
12-70802
12 days ago
12-70866
12 days
26200 adomani
author:adomani
fix: add label when landrun fails Adds the `permission-denied` label on PRs that get blocked by landrun. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) CI 68/8 .github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml 4 1 ['github-actions'] nobody
12-70310
12 days ago
12-70316
12 days ago
12-70362
12 days
25662 erdOne
author:erdOne
chore: redefine `LocalizedModule` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 197/229 Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/GroupTheory/OreLocalization/OreSet.lean,Mathlib/RingTheory/OreLocalization/Ring.lean,Mathlib/RingTheory/TensorProduct/Nontrivial.lean 6 11 ['erdOne', 'eric-wieser', 'github-actions', 'kckennylau', 'leanprover-bot'] nobody
12-70168
12 days ago
22-50185
22 days ago
22-50194
22 days
26219 Thmoas-Guan
author:Thmoas-Guan
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: Yongle Hu @mbkybky --- [![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 2 ['Thmoas-Guan', 'github-actions'] nobody
12-58998
12 days ago
12-59733
12 days ago
12-59784
12 days
26070 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`. --- Original PR: https://github.com/leanprover-community/mathlib4/pull/21522 large-import t-algebra t-number-theory
label:t-algebra$
255/73 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 4 ['erdOne', 'github-actions', 'riccardobrasca'] nobody
12-51989
12 days ago
14-76281
14 days ago
14-76433
14 days
26225 Raph-DG
author:Raph-DG
feat(AlgebraicGeometry): Add some minimal API for orders on schemes In this PR we add some minimal api for the ordering on schemes defined in #26204. We chose split these PRs because we expect there will be more discussion about this API, and having the preorder instance is useful in its own right without much added API. - [] depends on: #26204 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebraic-geometry 16/0 Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/AlgebraicGeometry/Scheme.lean 2 1 ['github-actions'] nobody
12-49724
12 days ago
12-49733
12 days ago
12-49778
12 days
26226 chrisflav
author:chrisflav
chore(AlgebraicGeometry/Limits): undeprecate `sigmaOpenCover` The replacement has the indexing type wrapped in `Discrete` which is inconvenient in practice. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebraic-geometry 5/3 Mathlib/AlgebraicGeometry/Limits.lean 1 1 ['erdOne', 'github-actions'] nobody
12-48920
12 days ago
12-49208
12 days ago
12-49193
12 days
26220 linesthatinterlace
author:linesthatinterlace
fix: Removes explict `FunLike` instance for `Equiv` Remove explict `FunLike` instance for `Equiv`. --- This is a somewhat experimental PR and I want to check there isn't a performance issue from doing this. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-logic 24/22 Mathlib/Algebra/Category/AlgCat/Limits.lean,Mathlib/Algebra/Category/MonCat/Limits.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Data/FunLike/Equiv.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/Order/Interval/Finset/Defs.lean 6 1 ['github-actions'] nobody
12-48619
12 days ago
12-48619
12 days ago
12-48611
12 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 48/0 Mathlib.lean,Mathlib/Order/Circular.lean,Mathlib/Order/Circular/ZMod.lean 3 11 ['Paul-Lez', 'YaelDillies', 'eric-wieser', 'github-actions'] bryangingechen
assignee:bryangingechen
12-41939
12 days ago
12-41939
12 days ago
15-75932
15 days
26130 kmill
author:kmill
feat: make `reassoc_of%` be able to defer `Category` instance This PR modifies the elaboration of `reassoc_of%` so that the `Category` instance can be synthesized later, like any other instance metavariable, rather than needing to be synthesized up front, when the category itself might not yet be known. This fixes an issue reported by Robert Maxton [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/reassoc_of.25.20misleading.20error/near/524678383), where in the following `reassoc_of% Sigma.ι_desc` was failing. ```lean import Mathlib.CategoryTheory.Limits.Shapes.Products open CategoryTheory Limits set_option autoImplicit true variable {C : Type u} [Category.{v, u} C] {β : Type w} {f : β → C} [HasCoproduct f] {P : C} (p : (b : β) → f b ⟶ P) (b : β) example {Q : C} (g : P ⟶ Q) : Sigma.ι f b ≫ Sigma.desc p ≫ g = p b ≫ g := by rw [reassoc_of% Sigma.ι_desc] ``` Without this PR, a workaround is writing `reassoc_of% @Sigma.ι_desc`. The PR adds `Lean.Meta.withEnsuringLocalInstance` for temporarily adding a metavariable as a local instance if it can't yet be synthesized. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 91/20 Mathlib/Lean/Meta/Basic.lean,Mathlib/Tactic/CategoryTheory/IsoReassoc.lean,Mathlib/Tactic/CategoryTheory/Reassoc.lean,MathlibTest/CategoryTheory/Reassoc.lean 4 6 ['github-actions', 'kmill', 'leanprover-bot', 'sgouezel'] nobody
12-28968
12 days ago
13-86259
13 days ago
13-86243
13 days
25883 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/) --- *This PR continues the work from #24575.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24575* migrated-from-branch new-contributor 157/2 Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramMatrix.lean,Mathlib/MeasureTheory/Function/L2Space.lean 3 8 ['eric-wieser', 'github-actions', 'pfaffelh'] nobody
12-25073
12 days ago
18-26323
18 days ago
18-26677
18 days
26240 grunweg
author:grunweg
perf(CommandLinterLinter): use Substring more Probably, these changes make little difference, but let's find out. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-linter RFC 14/15 Mathlib/Tactic/Linter/CommandStart.lean 1 5 ['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] nobody
12-23124
12 days ago
12-23124
12 days ago
12-27737
12 days
26243 DavidLedvinka
author:DavidLedvinka
feat(Topology): Add PairReduction.lean Add file PairReduction.lean which proves the theorem `pair_reduction` which is needed for the proof of the general Kolmogorov-Chentsov theorem in the Brownian Motion project. Co-authored-by: @RemyDegenne t-topology 435/0 Mathlib.lean,Mathlib/Topology/EMetricSpace/PairReduction.lean 2 1 ['github-actions'] nobody
11-81155
11 days ago
12-6031
12 days ago
0-1394
23 minutes
26258 kckennylau
author:kckennylau
feat(Topology): induction for sheafification --- I currently have binary and unary operation, which should be enough for sheaves. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 62/1 Mathlib/Topology/Sheaves/LocalPredicate.lean 1 1 ['github-actions'] nobody
11-36754
11 days ago
11-36863
11 days ago
11-36926
11 days
26061 kckennylau
author:kckennylau
feat(AlgebraicGeometry): define Projective Space This defines the projective space over a scheme, indexed by an arbitrary type. --- Zulip discussion: [#maths > Projective Space](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Projective.20Space/with/524057860) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebraic-geometry 63/0 Mathlib.lean,Mathlib/AlgebraicGeometry/ProjectiveSpace.lean 2 14 ['callesonne', 'erdOne', 'github-actions', 'kckennylau'] nobody
11-34629
11 days ago
15-15893
15 days ago
15-15941
15 days
26259 Raph-DG
author:Raph-DG
feat(Topology): Connecting different notions of locally finite In this PR we connect the notions of local finiteness of an indexed family of sets (as in LocallyFinite) and of a set of sets (as in Function.locallyFinsuppWithin) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 32/0 Mathlib/Topology/LocallyFinsupp.lean 1 3 ['Raph-DG', 'github-actions', 'kckennylau'] nobody
10-74497
10 days ago
11-36658
11 days ago
11-36701
11 days
26120 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/) This PR continues the work from #20160. Original PR: https://github.com/leanprover-community/mathlib4/pull/20160 t-data 69/0 Mathlib/Data/Seq/Seq.lean 1 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'vasnesterov'] nobody
10-51742
10 days ago
14-33078
14 days ago
14-33130
14 days
26247 vasnesterov
author:vasnesterov
perf(Topology/Metrizable): lower `IsCompletelyMetrizableSpace.MetrizableSpace` priority This PR continues the work from #24967. Original PR: https://github.com/leanprover-community/mathlib4/pull/24967 t-topology easy 3/1 Mathlib/Topology/Metrizable/CompletelyMetrizable.lean 1 6 ['github-actions', 'mathlib-bors', 'vasnesterov'] nobody
10-50831
10 days ago
10-50832
10 days ago
11-71247
11 days
25837 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/) --- *This PR continues the work from #24546.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24546* t-combinatorics 36/0 Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean 3 1 ['github-actions'] nobody
10-48022
10 days ago
19-70156
19 days ago
19-70142
19 days
26271 Raph-DG
author:Raph-DG
feat(AlgebraicGeometry): Simple lemma about existence of affine neighbourhoods In this PR we make a simple lemma saying there exists an affine open around any point in a scheme. This already exists in the language of open immersions, this just makes the construction of the affine open subset more convenient. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebraic-geometry 6/0 Mathlib/AlgebraicGeometry/AffineScheme.lean 1 1 ['github-actions'] nobody
10-45334
10 days ago
10-49420
10 days ago
10-49465
10 days
26059 wwylele
author:wwylele
feat(GroupTheory/Divisible): Add rational SMul and Module This is part of https://github.com/leanprover-community/mathlib4/pull/25140. A torsion-free ℕ-divisible commutative group is a ℚ-module. ---- This PR continues the work from #25190. Original PR: https://github.com/leanprover-community/mathlib4/pull/25190 t-algebra
label:t-algebra$
156/0 Mathlib/Data/NNRat/Lemmas.lean,Mathlib/Data/Rat/Lemmas.lean,Mathlib/GroupTheory/Divisible.lean 3 5 ['eric-wieser', 'github-actions', 'wwylele'] nobody
10-21683
10 days ago
15-15424
15 days ago
15-15446
15 days
26284 plp127
author:plp127
feat: faster implementation of `Nat.primeFactorsList` + `@[csimp]` lemma Add a function `Nat.primeFactorsListFast` that `#eval`s faster, and a `@[csimp]` lemma `Nat.primeFactorsList_eq_primeFactorsListFast` that shows `Nat.primeFactorsList = Nat.primeFactorsListFast`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 95/0 Mathlib/Data/Nat/Factors.lean 1 1 ['github-actions'] nobody
10-1326
10 days ago
10-1349
10 days ago
10-15266
10 days
25860 robin-carlier
author:robin-carlier
feat(CategoryTheory/Monoidal/Action): Action of monoidal opposites Given a monoidal category `C` and a category `D`, we prove that a left (resp. right) `Cᴹᵒᵖ`-action on `D` gives a right (resp. left) `C`-action on `D`. Conversely, we show that left/right `C`-actions gives right/left `Cᴹᵒᵖ`-actions. --- - [x] depends on: #25840 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 190/1 Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Action/Basic.lean,Mathlib/CategoryTheory/Monoidal/Action/Opposites.lean 3 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
9-77516
9 days ago
9-77681
9 days ago
10-31054
10 days
25875 robin-carlier
author:robin-carlier
feat(CategoryTheory/Monoidal/Action): actions as monoidal functors to endofunctors Given a monoidal category `C` and a category `D`, we show that left actions of `C` on `D` correspond to monoidal functors `C ⥤ (D ⥤ D)ᴹᵒᵖ` by showing that the composition of `curriedAction C D` with `mopFunctor` is monoidal, and in the other direction by defining an action of `C` on `D` out of the data of such a monoidal functor. Similarly, we show that monoidal functors `C ⥤ (D ⥤ D)` correspond to right actions of `C` on `D`. We use this to define the "evaluation" right action of `(C ⥤ C)` (with the composition monoidal structure) on `C` as the action corresponding to the identity functor `(C ⥤ C) ⥤ (C ⥤ C)`. --- - [x] depends on: #25840 - [x] depends on: #25766 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 222/3 Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Action/Basic.lean,Mathlib/CategoryTheory/Monoidal/Action/End.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean 4 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
9-77236
9 days ago
9-77236
9 days ago
10-29086
10 days
26057 YaelDillies
author:YaelDillies
feat: `mon_tauto`, a simp set to prove tautologies about a monoid object This simp set proves all tautologies involving (commutative) monoid objects in a (braided) monoidal category. The general algorithm it follows is to push the associators `α_` and commutators `β_` inwards until they cancel against the right sequence of multiplications. This approach is justified by the fact that a tautology in the language of (commutative) monoid objects "remembers" how it was proved: Every use of a (commutative) monoid object axiom inserts a unitor, associator or commutator, and proving a tautology simply amounts to undoing those moves as prescribed by the presence of unitors, associators and commutators in its expression. This simp set is opiniated about its normal form and therefore cannot be used concurrently to some of the simp lemmas in the standard simp set. As an example, we prove `tensorμ M M M M ≫ (μ ⊗ₘ μ) ≫ μ = (μ ⊗ₘ μ) ≫ μ`, the categorical equivalent of `mul_mul_mul_comm`. From Toric Co-authored-by: Andrew Yang --- - [x] depends on: #26102 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-category-theory 149/1 Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/Tactic/Attr/Register.lean,MathlibTest/CategoryTheory/Monoidal/MonTauto.lean,scripts/noshake.json 4 11 ['YaelDillies', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'robin-carlier'] nobody
9-69303
9 days ago
14-33031
14 days ago
15-9488
15 days
25976 robin-carlier
author:robin-carlier
feat(CategoryTheory/Monoidal/Action): preservation of left/right actions by functors We introduce typeclasses `F.LaxLeftLinear C`, `F.OplaxLeftLinear C` and `F.LeftLinear C` on functors `F : D ⥤ D'` where `D` and `D` have a monoidal left action of `C`. These typeclasses bundle "compatibility" of the actions, and are analogue to `LaxMonoidal` and `OplaxMonoidal` structures on functors. More precisely, `F.LaxLeftLinear C` bundles a"lineator" as a morphism `μₗ : c ⊙ₗ F.obj d ⟶ F.obj (c ⊙ₗ d)`, subject to naturality, associativity and unitality conditions while `F.OplaxLeftLinear C` bundles the "lineator" as a morphism `δₗ : F.obj (c ⊙ₗ d) ⟶ c ⊙ₗ F.obj d ` subject to similar conditions. `F.LeftLinear` bundles both a `LaxLeftLinear` and an `OplaxLeftLinear` structure, as well as the fact that `μₗ` is left and right inverse to `δₗ`. The analogue typeclasses for right actions are also introduced. --- - [x] depends on: #25840 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 361/1 Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Action/Basic.lean,Mathlib/CategoryTheory/Monoidal/Action/LinearFunctor.lean 3 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
9-60157
9 days ago
9-77200
9 days ago
10-29706
10 days
24730 YaelDillies
author:YaelDillies
feat(RingTheory): group-like elements Define group-like elements in a bialgebra, ie elements such that `η a = 1` and `Δ a = a ⊗ₜ a`. We prove that group-like elements of a coalgebra over a domain are linearly independent, group-like elements of a bialgebra form a monoid, group-like elements of a Hopf algebra form a group. From Toric Co-authored-by: Michał Mrugała --- - [x] depends on: #24747 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-algebra
label:t-algebra$
305/0 Mathlib.lean,Mathlib/RingTheory/Bialgebra/GroupLike.lean,Mathlib/RingTheory/Coalgebra/GroupLike.lean,Mathlib/RingTheory/HopfAlgebra/GroupLike.lean 4 30 ['Julian-Kuelshammer', 'Parcly-Taxel', 'YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot'] nobody
9-57840
9 days ago
53-24897
1 month ago
53-26452
53 days
26301 Ivan-Sergeyev
author:Ivan-Sergeyev
feat(LinearAlgebra/Matrix/Determinant/TotallyUnimodular): Empty matrices are totally unimodular. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
15/0 Mathlib/LinearAlgebra/Matrix/Determinant/TotallyUnimodular.lean 1 1 ['github-actions'] nobody
9-55116
9 days ago
9-55126
9 days ago
9-55171
9 days
25833 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 [daniele.bolla@stu.fernuni.ch](mailto:daniele.bolla@stu.fernuni.ch) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated-from-branch t-topology 219/1 Counterexamples.lean,Counterexamples/TopologistsSineCurve.lean,Mathlib/Topology/Connected/PathConnected.lean 3 5 ['github-actions', 'loefflerd', 'sgouezel'] nobody
9-54508
9 days ago
17-41009
17 days ago
19-72197
19 days
26299 adomani
author:adomani
perf: the `commandStart` linter only acts on modified files Introduces an `IO.Ref` to allow the `commandStart` linter to only run on files that git considers modified with respect to `master`. The linter is also active on files that have had some error, as these are likely being modified! The PR should also mitigate the speed-up that the linter introduced: [#mathlib4 > A whitespace linter @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/A.20whitespace.20linter/near/525091877) Assuming that this goes well, a similar mechanism could be applied to several linters that do not need to run on all code, just on the modified code. Implementation detail: the linter is currently either on or off in "whole" files. It may be also a future development to make this more granular and only run the linter on "modifed commands in modified files", but this is not currently the plan for this modification! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-linter 48/0 Mathlib/Tactic/Linter/CommandStart.lean 1 4 ['adomani', 'github-actions', 'leanprover-bot'] nobody
9-54441
9 days ago
9-54441
9 days ago
9-59074
9 days
26189 tb65536
author:tb65536
feat(FieldTheory/Galois/Basic): Add simp-lemma for `FixedPoints.intermediateField` This PR adds a simp-lemma `FixedPoints.mem_intermediateField_iff` for the definition `FixedPoints.intermediateField`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
4/0 Mathlib/FieldTheory/Galois/Basic.lean 1 1 ['github-actions'] nobody
9-48626
9 days ago
9-48626
9 days ago
13-19877
13 days
26308 LessnessRandomness
author:LessnessRandomness
feat(Analysis.NormedSpace): add normalized vectors --- Add normalized vectors to Mathlib (zero vector for zero vector, the corresponding unit vectors for nonzero vectors) new-contributor t-analysis 65/0 Mathlib.lean,Mathlib/Analysis/NormedSpace/Normalized.lean 2 1 ['github-actions'] nobody
9-47221
9 days ago
9-47233
9 days ago
9-47279
9 days
25997 tb65536
author:tb65536
refactor(FieldTheory/Galois): Switch from `Fintype` to `Finite` This PR switches mathlib's Galois theory from `Fintype` to `Finite` to match the group theory library. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
59/61 Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/PolynomialGaloisGroup.lean,Mathlib/NumberTheory/NumberField/CMField.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean 8 1 ['github-actions'] nobody
9-46489
9 days ago
9-46489
9 days ago
15-52932
15 days
26190 tb65536
author:tb65536
feat(FieldTheory/Galois/IsGaloisGroup): Subgroups of a Galois group are Galois groups This PR gives an instance `IsGaloisGroup H (FixedPoints.intermediateField H : IntermediateField K L) L` from `IsGaloisGroup G K L`, and a numerical corollary. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
11/0 Mathlib/FieldTheory/Galois/IsGaloisGroup.lean 1 1 ['github-actions'] nobody
9-45586
9 days ago
9-45587
9 days ago
13-15189
13 days
26316 alreadydone
author:alreadydone
feat(RingTheory): degree of rational function field extension This PR continues the work from #22966. Original PR: https://github.com/leanprover-community/mathlib4/pull/22966 t-algebra
label:t-algebra$
268/49 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 2 ['alreadydone', 'github-actions'] riccardobrasca
assignee:riccardobrasca
9-42430
9 days ago
9-42437
9 days ago
9-45073
9 days
26319 Vierkantor
author:Vierkantor
ci: specify leanprover-community/mathlib4 when checking out master This PR makes it explicit that we want to run CI against the `master` branch from `leanprover-community/mathlib4` instead of another repo. The new mathlib4-nightly-testing repo should run CI on the nightly branches as if they are already part of the `master` branch. But when checking them out, it defaults to looking for the branch in `leanprover-community/mathlib4-nightly-testing`, which does not exist. So a simple fix is to make the upstream repo name explicit. A potential disadvantage: it will be harder to test CI changes by opening a pull request against one's own fork. (Which is what I did to test a few CI changes before). --- This change makes sense to me but maybe there is a better option? I don't think we want to have custom CI in the other repo, because it will get obliterated next time we do an update. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) CI 4/0 .github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml 4 1 ['github-actions'] nobody
9-40481
9 days ago
9-40550
9 days ago
9-40534
9 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
label:t-algebra$
871/0 .vscode/settings.json,Mathlib.lean,Mathlib/RingTheory/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRingDimension.lean,Mathlib/RingTheory/RegularLocalRing.lean 5 5 ['Brian-Nugent', 'github-actions', 'mathlib4-dependent-issues-bot', 'yuanyi-350'] nobody
9-26563
9 days ago
10-21
10 days ago
10-886
10 days
26265 EtienneC30
author:EtienneC30
feat: random variables are independent iff their joint distribution is the product measure Also prove that random variables are independent iff any finite subfamily is independent. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-measure-probability 109/8 Mathlib.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/Probability/Independence/Basic.lean,Mathlib/Probability/Independence/InfinitePi.lean,Mathlib/Probability/Independence/Kernel.lean 5 4 ['EtienneC30', 'github-actions', 'sgouezel'] nobody
9-25904
9 days ago
10-70992
10 days ago
10-70976
10 days
26078 kckennylau
author:kckennylau
feat(AlgebraicGeometry): add x, y, px, py for points on elliptic curves --- Split from #25218. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebraic-geometry 44/0 Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean 1 10 ['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'github-actions', 'kckennylau'] nobody
9-22020
9 days ago
14-60526
14 days ago
14-60572
14 days
26330 Timeroot
author:Timeroot
"Junk value" test file This PR continues the work from #25173. Original PR: https://github.com/leanprover-community/mathlib4/pull/25173 t-data 362/2 Mathlib/Data/Nat/Find.lean,MathlibTest/Junk.lean 2 2 ['Timeroot', 'github-actions'] nobody
9-7039
9 days ago
9-7045
9 days ago
9-7092
9 days
26332 Timeroot
author:Timeroot
feat (ModelTheory/Definability): TermDefinable functions This PR continues the work from #23506. Original PR: https://github.com/leanprover-community/mathlib4/pull/23506 large-import 159/0 Mathlib/Data/Rel.lean,Mathlib/ModelTheory/Definability.lean,scripts/noshake.json 3 2 ['Timeroot', 'github-actions'] nobody
9-6771
9 days ago
9-6778
9 days ago
9-6823
9 days
23460 Timeroot
author:Timeroot
feat: Definition of `Clone` Basics about Clones. Part of #20051 --- - [x] depends on: #23459 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
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
9-6220
9 days ago
9-6222
9 days ago
9-7515
9 days
26331 Timeroot
author:Timeroot
feat(Algebra/Polynomial): Descartes' Rule of signs This PR continues the work from #23681. Original PR: https://github.com/leanprover-community/mathlib4/pull/23681 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 5 ['Timeroot', 'adomani', 'github-actions'] nobody
9-3669
9 days ago
9-6889
9 days ago
9-6936
9 days
26274 EtienneC30
author:EtienneC30
feat: api for symmetric bilinear forms Change the definition of `BilinForm.IsSymm` to make it a structure, in order to extend it to define `ContinuousBilinForm.IsPosSemidef` in #26315. Prove polarization identity. Prove two lemmas about `BilinForm.toMatrix`. --- From Brownian motion [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
88/17 Mathlib/LinearAlgebra/BilinearForm/Orthogonal.lean,Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/RingTheory/Trace/Defs.lean 4 2 ['bryangingechen', 'github-actions'] nobody
8-78401
8 days ago
8-78401
8 days ago
9-6374
9 days
26255 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. --- In this PR I had to add `set_option linter.style.longFile 1700` in `Analytic/Basic.lean`. I split this file in the next PR: #26270. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This PR continues the work from #22531. Original PR: https://github.com/leanprover-community/mathlib4/pull/22531 t-analysis 148/11 Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean 5 11 ['github-actions', 'grunweg', 'vasnesterov'] grunweg
assignee:grunweg
8-35381
8 days ago
9-52010
9 days ago
11-25010
11 days
26201 scholzhannah
author:scholzhannah
feat: subcomplexes of a classical CW complex This PR defines subcomplexes of a (classical relative) CW complex to be a closed subspace which is a union of open cells. It provides additional definitions for alternative ways to describe subcomplexes. Lastly, it refactors the definition of the skeleton to define it as a subcomplex. Co-authored-by: Floris van Doorn --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 213/25 Mathlib/Topology/CWComplex/Classical/Basic.lean 1 1 ['github-actions'] nobody
7-67016
7 days ago
12-69904
12 days ago
12-69949
12 days
25974 scholzhannah
author:scholzhannah
feat(Topology/Compactness/CompactlyCoherentSpace): compact coherentification (k-ification) This PR defines the notion of turning an arbitrary topological space into a compactly coherent space. Compactly coherent spaces are commonly referred to as "compactly generated spaces" or "k-spaces" in the literature while the operation of turning a space into such as space is called the "k-ification". There are however three different notions that are described with this name. To disambiguate we use the names "compactly coherent space" and "compactcoherentification" here. See [this wikipedia page](https://en.wikipedia.org/wiki/Compactly_generated_space) for an explanation of these notions. This PR continues the work from #25318. Original PR: https://github.com/leanprover-community/mathlib4/pull/25318 Co-authored-by: Floris van Doorn large-import t-topology 175/5 Mathlib/Topology/Compactness/CompactlyCoherentSpace.lean 1 2 ['github-actions', 'scholzhannah'] nobody
7-66917
7 days ago
16-32437
16 days ago
16-32487
16 days
26415 thorimur
author:thorimur
feat: basic translations between `X →o Y` and `X ⥤ Y` Adds basic definitions translating between `X →o Y` and `X ⥤ Y` where `X` and `Y` are regarded as `Preorder` categories. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 53/14 Mathlib/CategoryTheory/Category/Preorder.lean 1 2 ['github-actions', 'thorimur'] nobody
7-16487
7 days ago
7-16487
7 days ago
7-16829
7 days
26368 Whysoserioushah
author:Whysoserioushah
feat(RingTheory/TwoSidedIdeal/SpanAsSum): span of set as finsum Reopened after everything moved to fork. --- [![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 1 ['github-actions'] nobody
6-38125
6 days ago
8-36193
8 days ago
8-36241
8 days
26354 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/) This PR continues the work from #21966. Original PR: https://github.com/leanprover-community/mathlib4/pull/21966 large-import t-meta 300/107 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 15 ['JovanGerb', 'github-actions', 'mathlib4-dependent-issues-bot', 'vasnesterov'] nobody
6-31480
6 days ago
8-57988
8 days ago
8-58046
8 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 11 ['eric-wieser', 'github-actions', 'jsm28', 'ocfnash'] nobody
6-31413
6 days ago
38-58004
1 month ago
39-12477
39 days
26375 joelriou
author:joelriou
chore(CategoryTheory/Localization): fix morphisms in the category of resolutions This PR changes the definition of morphisms in the categories `LeftResolution` and `RightResolution` attached to morphisms of localizers. Previously, we assumed that morphisms between resolutions belonged to the given class of morphisms of the localizer, but in downstream applications, it turns out it is more convenient to remove this condition (which would anyway be automatically verified in most situations). (The literature is not very explicit about whether this condition should or should not be part of the definition.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 12/27 Mathlib/CategoryTheory/Localization/DerivabilityStructure/Constructor.lean,Mathlib/CategoryTheory/Localization/Resolution.lean 2 1 ['github-actions'] nobody
6-31209
6 days ago
8-31136
8 days ago
8-31121
8 days
26428 Ruben-VandeVelde
author:Ruben-VandeVelde
feat: norm_num support for Int.fract --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 44/0 Mathlib/Data/Rat/Floor.lean,MathlibTest/norm_num_ext.lean 2 5 ['Rob23oba', 'github-actions'] nobody
6-26981
6 days ago
6-27022
6 days ago
6-71783
6 days
25915 BoltonBailey
author:BoltonBailey
chore(Algebra/Squarefree/Basic): fix erw This PR addresses an instance of the erw linter in Algebra/Squarefree/Basic. Original PR: https://github.com/leanprover-community/mathlib4/pull/25161 tech debt t-algebra easy
label:t-algebra$
1/1 Mathlib/Algebra/Squarefree/Basic.lean 1 1 ['github-actions'] nobody
6-8210
6 days ago
10-30132
10 days ago
17-48196
17 days
26195 yuanyi-350
author:yuanyi-350
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$
161/1 Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/SuccPred.lean,Mathlib/GroupTheory/Perm/Fin.lean 4 1 ['github-actions'] nobody
5-82514
5 days ago
12-74815
12 days ago
13-188
13 days
25979 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. --- This PR continues the work from #24144. Original PR: https://github.com/leanprover-community/mathlib4/pull/24144 t-category-theory 163/0 Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/Adjunction.lean,docs/references.bib 3 3 ['callesonne', 'github-actions', 'joelriou'] callesonne
assignee:callesonne
5-78949
5 days ago
16-29353
16 days ago
16-29398
16 days
26036 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. --- This PR continues the work from #22490. Original PR: https://github.com/leanprover-community/mathlib4/pull/22490 t-category-theory 160/0 Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/PointwiseRightDerived.lean 2 2 ['github-actions', 'joelriou'] nobody
5-78899
5 days ago
15-52303
15 days ago
15-52350
15 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 44 ['acmepjz', 'faenuccio', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mbkybky', 'yuanyi-350'] faenuccio
assignee:faenuccio
5-76392
5 days ago
5-76392
5 days ago
75-79796
75 days
26353 kebekus
author:kebekus
feat: restriction of scalars for iterated Fréchet derivatives Establish standard theorems on restriction of scalars for iterated Fréchet derivatives, comparing iterated derivatives with respect to a field `𝕜'` to iterated derivatives with respect to a subfield `𝕜 ⊆ 𝕜'`. The results are analogous to those found in `Mathlib.Analysis.Calculus.FDeriv.RestrictScalars`. 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 102/0 Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/RestrictScalars.lean,Mathlib/Analysis/Calculus/FDeriv/RestrictScalars.lean 4 4 ['github-actions', 'kebekus', 'sgouezel'] nobody
5-74716
5 days ago
5-74807
5 days ago
5-78364
5 days
26426 Komyyy
author:Komyyy
doc: remove `PartENat.card` in the module doc [`PartENat.card`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Deprecated/Cardinal/Finite.html#PartENat.card) is moved to the `Deprecated` directory and it's not in this file([`Mathlib.SetTheory.Cardinal.Finite`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/SetTheory/Cardinal/Finite.html)) anymore. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-set-theory maintainer-merge easy documentation 0/2 Mathlib/SetTheory/Cardinal/Finite.lean 1 2 ['github-actions', 'grunweg'] nobody
5-70282
5 days ago
5-70282
5 days ago
5-70296
5 days
26396 xroblot
author:xroblot
feat(RingTheory): define the dual of a basis for the trace and prove basic properties --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
133/28 Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Trace/Basic.lean 3 1 ['github-actions'] nobody
5-60226
5 days ago
7-74931
7 days ago
7-74983
7 days
26474 xroblot
author:xroblot
feat(NumberTheory): `N(I 𝓞L) = N(I) ^ [L:K]` for an integral ideal `I` of `K` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-number-theory 74/4 Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/Ideal/Int.lean,Mathlib/RingTheory/Ideal/Over.lean 4 1 ['github-actions'] nobody
5-56522
5 days ago
5-56530
5 days ago
5-56582
5 days
26453 jburroni
author:jburroni
feat(Data/PNat/Basic): add order-related instances to PNat Add `SuccAddOrder ℕ+` and `NoMaxOrder ℕ+` instances. This allows, for example, the use of lemmas related to `Intervals` built with ℕ+. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-data new-contributor 18/0 Mathlib/Data/PNat/Basic.lean 1 3 ['eric-wieser', 'github-actions', 'jburroni'] nobody
5-53265
5 days ago
6-37123
6 days ago
6-37170
6 days
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 t-category-theory 105/0 Mathlib.lean,Mathlib/Algebra/Category/Grp/Yoneda.lean,Mathlib/Algebra/Category/MonCat/Yoneda.lean,Mathlib/CategoryTheory/Preadditive/Yoneda/Basic.lean 4 32 ['TwoFX', 'YaelDillies', 'callesonne', 'erdOne', 'github-actions', 'kckennylau', 'leanprover-community-bot-assistant'] nobody
5-41570
5 days ago
22-44574
22 days ago
49-55330
49 days
26358 plp127
author:plp127
feat(Topology): R1 spaces are quasisober This PR continues the work from #24054. Original PR: https://github.com/leanprover-community/mathlib4/pull/24054 bench-after-CI t-topology 23/9 Mathlib/Topology/Separation/Hausdorff.lean,Mathlib/Topology/Sober.lean 2 16 ['faenuccio', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'plp127'] nobody
5-28979
5 days ago
5-29035
5 days ago
8-54011
8 days
26280 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 #26282 This PR continues the work from #24120. Original PR: https://github.com/leanprover-community/mathlib4/pull/24120 - [ ] depends on: #26279 t-algebra
label:t-algebra$
145/23 Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean 3 4 ['AntoineChambert-Loir', 'github-actions', 'mathlib4-dependent-issues-bot', 'tb65536'] riccardobrasca
assignee:riccardobrasca
5-28028
5 days ago
6-3521
6 days ago
9-2681
9 days
26023 Garmelon
author:Garmelon
chore: add githelper.py script As described in the readme file, this somewhat opinionated script aims to help fix weird git repo setups and restore them to a standardized state that closely matches what `gh repo clone` does. Like `migrate_to_fork.py`, this script requires the user to have `git` and `gh` installed. To use the script, run `scripts/githelper.py fix` in a git repo that is either a clone of mathlib or of a mathlib fork. The script will prompt you before making any changes, so the user retains control over the entire process. The script also prints the commands used. `fix` is a subcommand so other git and github management tasks can be added in the future. Possible examples: Deleting branches of closed PRs, keeping the fork in sync with upstream, removing branches from a fork that was accidentally cloned with all mathlib branches included. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 490/0 scripts/README.md,scripts/githelper.py 2 8 ['Garmelon', 'bryangingechen', 'github-actions', 'jcommelin'] bryangingechen
assignee:bryangingechen
5-13908
5 days ago
5-13908
5 days ago
7-23185
7 days
26371 Timeroot
author:Timeroot
feat(NumberTheory): Niven's theorem This file proves Niven's theorem, that the only rational cosines of angles that are rational multiples of pi, are [-1, -1/2, 0, 1/2, 1]. This is one of the theorems missing from 1000.yaml. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-number-theory 119/0 Mathlib.lean,Mathlib/NumberTheory/Niven.lean,docs/1000.yaml 3 9 ['Timeroot', 'github-actions', 'grunweg', 'plp127'] nobody
5-13119
5 days ago
8-35197
8 days ago
8-35246
8 days
26486 DavidLedvinka
author:DavidLedvinka
feat(Order): Add curried versions of `biSup_prod` and `biInf_prod` Used in the Brownian Motion project. t-order easy 8/0 Mathlib/Order/CompleteLattice/Basic.lean 1 1 ['github-actions'] nobody
5-2582
5 days ago
5-2616
5 days ago
5-2629
5 days
26469 euprunin
author:euprunin
chore: golf using `assumption_mod_cast` 5/9 Mathlib/Algebra/Lie/Weights/Killing.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/RingTheory/Norm/Defs.lean,Mathlib/Topology/Category/LightProfinite/Sequence.lean 4 4 ['bryangingechen', 'github-actions', 'leanprover-bot'] nobody
4-80844
4 days ago
4-80844
4 days ago
5-64402
5 days
26150 YaelDillies
author:YaelDillies
feat: `CanLift` instance from `ConvexCone` to `ProperCone` For this, move `ConvexCone.pointed_of_nonempty_of_mem` earlier and rename it to `ConvexCone.Pointed.of_nonempty_of_mem`. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-analysis 45/22 Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Analysis/Convex/Cone/InnerDual.lean 2 4 ['YaelDillies', 'b-mehta', 'github-actions'] nobody
4-80238
4 days ago
13-59867
13 days ago
13-60160
13 days
26287 mbkybky
author:mbkybky
feat(Data/ENat/Lattice): coercion to `WithBot ℕ∞` commutes with `biSup` The coercion from `ℕ∞` to `WithBot ℕ∞` commutes with `biSup` and `biInf`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 19/0 Mathlib/Data/ENat/Lattice.lean 1 1 ['github-actions'] nobody
4-43736
4 days ago
10-1276
10 days ago
10-9027
10 days
26492 Komyyy
author:Komyyy
feat: Alexandrov discrete implies locally path-connected The primary motivation for this theorem is to deduce path-connectedness from connectedness in finite topological spaces: ```lean import Mathlib.Topology.Connected.LocPathConnected example {X : Type*} [TopologicalSpace X] [Finite X] [ConnectedSpace X] : PathConnectedSpace X := by rw [pathConnectedSpace_iff_connectedSpace]; assumption ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 22/0 Mathlib/Topology/AlexandrovDiscrete.lean,Mathlib/Topology/Connected/LocPathConnected.lean 2 1 ['github-actions'] nobody
4-39042
4 days ago
4-39042
4 days ago
4-39163
4 days
26462 PSchwahn
author:PSchwahn
feat(LinearAlgebra/Projection): add results about inverse of `Submodule.prodEquivOfIsCompl` Add two theorems `Submodule.prodEquivOfIsCompl_symm_apply` and `Submodule.prodEquivOfIsCompl_symm_add`, which are API for `Submodule.prodEquivOfIsCompl`. We believe these theorems are useful; for example, we have used their statements in a [classification formalization project](https://github.com/LieLean/LowDimSolvClassification). I am not sure whether the `prodEquivOfIsCompl_symm_apply` theorem should be tagged with `@[simp]`; this might lead to confluence issues. Opinions are welcome! Co-authored by: - [Viviana del Barco](https://github.com/vdelbarc) - [Gustavo Infanti](https://github.com/GuQOliveira) - [Exequiel Rivas](https://github.com/erivas) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
9/0 Mathlib/LinearAlgebra/Projection.lean 1 5 ['PSchwahn', 'github-actions', 'kckennylau'] nobody
4-20475
4 days ago
6-6109
6 days ago
6-6236
6 days
25862 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/) --- *This PR continues the work from #25174.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/25174* migrated-from-branch new-contributor t-euclidean-geometry 53/1 Mathlib/Geometry/Euclidean/Triangle.lean 1 8 ['eric-wieser', 'github-actions', 'jsm28', 'zcyemi'] nobody
4-14304
4 days ago
18-50775
18 days ago
18-54717
18 days
26489 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. --- - [x] depends on: #22931 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This PR continues the work from #22930. Original PR: https://github.com/leanprover-community/mathlib4/pull/22930 t-algebra
label:t-algebra$
62/77 Mathlib/RingTheory/RingHom/FinitePresentation.lean 1 4 ['chrisflav', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot'] nobody
3-85784
3 days ago
4-54937
4 days ago
4-54986
4 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 12 ['eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'plp127', 'vihdzp'] nobody
3-82875
3 days ago
52-18558
1 month ago
118-18542
118 days
26478 JovanGerb
author:JovanGerb
chore(LibraryRewrite): replace `rw??` with `rw?` As suggested by @YaelDillies, now `rw?` overwrites Lean core's implementation of `rw?`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 38/33 Mathlib/Tactic/Widget/LibraryRewrite.lean,MathlibTest/LibraryRewrite.lean 2 3 ['YaelDillies', 'erdOne', 'github-actions'] nobody
3-78261
3 days ago
5-50008
5 days ago
5-50052
5 days
26500 sgouezel
author:sgouezel
feat: more properties of the manifold structure on `Icc` The manifold structure on real intervals is defined in `Mathlib.Geometry.Manifold.Instances.Real`. We relate it to the manifold structure on the real line, by showing that the inclusion and projection are smooth, and showing that a function defined on the interval is smooth iff its composition with the projection is smooth on the interval in `ℝ`. We also define `1 : TangentSpace (𝓡∂ 1) z`, and relate it to `1` in the real line. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-differential-geometry 215/2 Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Icc.lean,Mathlib/Topology/Order/ProjIcc.lean 3 9 ['github-actions', 'grunweg', 'sgouezel'] grunweg
assignee:grunweg
3-76810
3 days ago
3-76871
3 days ago
3-84192
3 days
26251 YaelDillies
author:YaelDillies
chore(Units): better follow the naming convention Moves * `Units.ext` -> `Units.val_injective` * `Units.eq_iff` -> `Units.val_inj` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 63/57 Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Center.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Order/Monoid/Units.lean,Mathlib/Algebra/Polynomial/UnitTrinomial.lean,Mathlib/Algebra/Ring/Units.lean,Mathlib/Analysis/Complex/Isometry.lean,Mathlib/Data/Complex/Determinant.lean,Mathlib/Data/Fintype/Units.lean,Mathlib/Data/ZMod/Units.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/LinearAlgebra/CliffordAlgebra/SpinGroup.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/DirichletCharacter/Basic.lean,Mathlib/NumberTheory/DirichletCharacter/GaussSum.lean,Mathlib/NumberTheory/LucasPrimality.lean,Mathlib/NumberTheory/MulChar/Basic.lean,Mathlib/NumberTheory/NumberField/Units/Basic.lean,Mathlib/RingTheory/ClassGroup.lean,Mathlib/RingTheory/Fintype.lean,Mathlib/RingTheory/IntegralDomain.lean,Mathlib/RingTheory/RootsOfUnity/Basic.lean,Mathlib/RingTheory/RootsOfUnity/EnoughRootsOfUnity.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/IsOpenUnits.lean,MathlibTest/instance_diamonds.lean 31 1 ['github-actions'] nobody
3-74780
3 days ago
3-74797
3 days ago
11-57419
11 days
25692 Whysoserioushah
author:Whysoserioushah
feat(RingTheory/MatrixAlgebra): add a more general version of `matrixEquivTensor` This adds `tensorMatrixLinearEquiv : A ⊗[R] Matrix n n B ≃ₐ[S] Matrix n n (A ⊗[R] B)` which is a more general version of `matrixEquivTensor : Matrix n n A ≃ₐ[R] (A ⊗[R] Matrix n n R)`. The latter is then implemented as a trivial consequence of the former. Many internal implementation details are deleted without deprecation, although strictly these were not `private. Co-authored-by: @erdOne Co-authored-by: Eric Wieser --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
108/99 Mathlib/Data/Matrix/Basis.lean,Mathlib/RingTheory/MatrixAlgebra.lean 2 12 ['Whysoserioushah', 'eric-wieser', 'github-actions'] nobody
3-63085
3 days ago
5-13224
5 days ago
21-69029
21 days
26464 joelriou
author:joelriou
feat(LinearAlgebra): generators of pi tensor products In this PR, we show that the `R`-module `⨂[R] i, M i` is finitely generated if the index type is finite and all `M i` are finitely generated. This follows from a more precise result about generators of `⨂[R] i, M i`. --- This PR continues the work from #18725. Original PR: https://github.com/leanprover-community/mathlib4/pull/18725 file-removed t-algebra
label:t-algebra$
275/4 Mathlib.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Set/SubtypeNeLift.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 9 8 ['eric-wieser', 'github-actions', 'joelriou'] nobody
3-61947
3 days ago
3-61947
3 days ago
4-38709
4 days
26501 sgouezel
author:sgouezel
feat: more API on manifolds --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-differential-geometry 65/7 Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/MFDeriv/Atlas.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean 4 9 ['github-actions', 'grunweg', 'sgouezel'] grunweg
assignee:grunweg
3-59755
3 days ago
3-85296
3 days ago
3-85282
3 days
25781 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), [Jakob von Raumer](https://github.com/javra), [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/) --- *This PR continues the work from #25459.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/25459* infinity-cosmos large-import t-category-theory 168/2 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 16 ['emilyriehl', 'github-actions', 'joelriou'] nobody
3-58339
3 days ago
3-58339
3 days ago
5-10668
5 days
25782 emilyriehl
author:emilyriehl
feat(CategoryTheory/Category/Cat): cartesian closed instance on small categories The category of small categories is cartesian closed, with exponentials defined by functor categories. Adjoint transposition is defined by currying and uncurrying. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *This PR continues the work from #25646.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/25646* infinity-cosmos t-category-theory 160/1 Mathlib.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Category/Cat/CartesianClosed.lean,Mathlib/CategoryTheory/Functor/Currying.lean 4 11 ['callesonne', 'emilyriehl', 'github-actions', 'joelriou'] nobody
3-53249
3 days ago
3-53461
3 days ago
5-75645
5 days
26510 alreadydone
author:alreadydone
feat(Matroid): exchange lemmas involving closure --- for #24350 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data t-combinatorics 37/0 Mathlib/Data/Matroid/Closure.lean 1 1 ['github-actions'] nobody
3-52541
3 days ago
3-52567
3 days ago
3-52614
3 days
25784 emilyriehl
author:emilyriehl
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/) --- *This PR continues the work from #25287.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/25287* infinity-cosmos t-category-theory 341/0 Mathlib.lean,Mathlib/CategoryTheory/Bicategory/CatEnriched.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Cat.lean 3 4 ['emilyriehl', 'github-actions', 'joelriou'] nobody
3-51740
3 days ago
3-51740
3 days ago
4-12575
4 days
26512 pechersky
author:pechersky
feat(RingTheory/Valuation/Integers): nontrivial_iff valuation subring is nontrivial iff ring is nontrivial stated using Integers to be more general --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra t-analysis t-number-theory easy
label:t-algebra$
13/0 Mathlib/RingTheory/Valuation/Integers.lean 1 1 ['github-actions'] nobody
3-51089
3 days ago
3-51132
3 days ago
3-51148
3 days
26060 kckennylau
author:kckennylau
feat(RingTheory): define Grassmannians This defines the Grassmannians of a module over a ring. --- Zulip discussion: [#maths > Projective Space](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Projective.20Space/with/524057860) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra t-algebraic-geometry
label:t-algebra$
94/0 Mathlib.lean,Mathlib/RingTheory/Grassmannian.lean,docs/references.bib 3 29 ['erdOne', 'eric-wieser', 'github-actions', 'kckennylau', 'mattrobball'] nobody
3-49900
3 days ago
15-12192
15 days ago
15-16754
15 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 - [x] depends on: #25062 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
466/0 Mathlib.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/FieldTheory/SeparableClosure.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/RingTheory/AlgebraicIndependent/Basic.lean,Mathlib/RingTheory/AlgebraicIndependent/TranscendenceBasis.lean 6 29 ['alreadydone', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot'] nobody
3-38695
3 days ago
19-69690
19 days ago
19-69688
19 days
26448 YaelDillies
author:YaelDillies
refactor: simplify `(f₁ ⊗ₘ f₂) ≫ (g₁ ⊗ₘ g₂)` to `(f₁ ≫ g₁) ⊗ₘ (f₂ ≫ g₂)` ... instead of the other way around. This is motivated by the fact that homs happening "in parallel" is a non-concept (time along a branch can always be reparametrised), while homs happening "in series" is a well-defined concept. One should not simp the well-defined concept into the non-concept but instead the other way around. This is also motivated by the advent of the `mon_tauto` simp set in #26057. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-category-theory 115/119 Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/Dialectica/Monoidal.lean,Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/Enriched/FunctorCategory.lean,Mathlib/CategoryTheory/GradedObject/Braiding.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Braided/Reflection.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Internal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/NaturalTransformation.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Preadditive.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/CategoryTheory/Monoidal/Types/Coyoneda.lean 24 4 ['YaelDillies', 'eric-wieser', 'github-actions', 'robin-carlier'] nobody
3-34974
3 days ago
3-66424
3 days ago
4-13094
4 days
26524 pechersky
author:pechersky
chore(RingTheory/Valuation): Valution.Integers implies IsFractionRing generalize `IsFractionRing v.integer K` to `IsFractionRing O K` when `v.Integers O K`. Since `IsFractionRing` is prop, one should have a prop-relationship between the valuation subring and base ring On the way, remove `IsDomain O` from the necessary TC arguments, since it is implied by `Valuation.Integers` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
35/22 Mathlib/RingTheory/Valuation/ValuationRing.lean 1 1 ['github-actions'] nobody
3-30773
3 days ago
3-30784
3 days ago
3-30826
3 days
26006 CBirkbeck
author:CBirkbeck
Add the Mittag-Leffler expansion for cotangent This PR continues the work from #25448. Original PR: https://github.com/leanprover-community/mathlib4/pull/25448 large-import 187/3 Mathlib/Analysis/Complex/IntegerCompl.lean,Mathlib/Analysis/Complex/LocallyUniformLimit.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean 4 1 ['github-actions'] nobody
3-25792
3 days ago
3-36194
3 days ago
15-70560
15 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 3 ['eric-wieser', 'github-actions', 'wwylele'] nobody
3-14869
3 days ago
31-41301
1 month ago
31-41364
31 days
26204 Raph-DG
author:Raph-DG
feat(AlgebraicGeometry): Add global preorder instance for schemes In this PR we added a default preorder instance for schemes, defined to be the specialization order as discussed here: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/dimension.20function.20for.20schemes/near/524997376 for discussion --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebraic-geometry easy 15/0 Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/AlgebraicGeometry/Scheme.lean 2 3 ['Raph-DG', 'erdOne', 'github-actions'] nobody
2-76078
2 days ago
8-59882
8 days ago
11-78433
11 days
26148 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 --- This PR continues the work from #24448. Original PR: #24448. CC: @tb65536 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
11/0 Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Span.lean 2 1 ['github-actions'] nobody
2-74909
2 days ago
13-64496
13 days ago
13-64527
13 days
26531 JovanGerb
author:JovanGerb
fix(RefinedDiscrTree): remove funny `transparency` handling This PR fixes some funny behaviour of `RefinedDiscrTree` discovered at #26484. This PR aligns the behaviour with Lean core's `DiscrTree`. The original reason for this special treatment was to avoid a mathlib breakage. But now it turns out that this special trearment also causes a mathlib breakage (but this one is harder to fix). The breakage that was the original reason for this behaviour is easily fixed using a `dsimp`. #26484 depends on this PR --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 6/13 Mathlib/Lean/Meta/RefinedDiscrTree/Basic.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Encode.lean,Mathlib/Probability/ProductMeasure.lean 3 2 ['github-actions', 'grunweg'] nobody
2-72990
2 days ago
3-16745
3 days ago
3-16791
3 days
26535 joelriou
author:joelriou
feat(Algebra/Homology/Embedding): the homology of the restriction Given an embedding of complex shapes, we provide an API to compute the homology of the "restriction". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra t-category-theory
label:t-algebra$
122/0 Mathlib/Algebra/Homology/Embedding/RestrictionHomology.lean,Mathlib/Algebra/Homology/ShortComplex/HomologicalComplex.lean 2 1 ['github-actions'] nobody
2-69738
2 days ago
2-73217
2 days ago
2-73260
2 days
26295 DavidJWebb
author:DavidJWebb
feat: filtering lists and bounded quantifiers are primitive recursive A few useful lemmas not explicitly in Primrec.lean : - Filtering for elements from a list that meet a primrec criterion is primrec - Checking whether a list has some element meeting a primrec criterion is primrec - Checking whether every element of a list meets a primrec criterion is primrec - Primitive recursive functions are closed under bounded existential and universal quantifiers --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-computability new-contributor 210/0 Mathlib.lean,Mathlib/Computability/PrimrecFilter.lean 2 3 ['DavidJWebb', 'github-actions', 'grunweg'] nobody
2-68801
2 days ago
8-83363
8 days ago
8-85054
8 days
26192 kckennylau
author:kckennylau
feat(LinearAlgebra): symmetric tensor power --- Zulip: [#mathlib4 > Proposal: Symmetric Tensor Power](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Proposal.3A.20Symmetric.20Tensor.20Power/with/524795235) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
124/0 Mathlib.lean,Mathlib/LinearAlgebra/TensorPower/Symmetric.lean 2 5 ['AntoineChambert-Loir', 'erdOne', 'eric-wieser', 'github-actions'] nobody
2-63165
2 days ago
13-17857
13 days ago
13-17902
13 days
25743 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. --- - [x] depends on: #25742 Future work includes using this monoidal structure and Day convolution to define the join monoidal structure on augmented simplicial sets, and also using this category as a way to encode monoidal and monadic bar constructions. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *This PR continues the work from #22768.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/22768* t-topology t-category-theory 512/111 Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Monoidal.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean 5 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'robin-carlier'] nobody
2-57723
2 days ago
17-40225
17 days ago
17-40210
17 days
26155 xroblot
author:xroblot
feat(DedekindDomain/Different): add the transitivity formula This PR proves the transitivity formula for the different ideal. It introduces ~~two~~ one increase~~s~~ in imports: - `RingTheory.FractionalIdeal.Extended`: this is a short leaf file and I think the import makes sense there - ~~`RingTheory.Localization.Defs.lean `: the file `Algebra.Algebra.Basic` is added since it is necessary to have the definition of `noZeroSMulDivisors` to get that some algebra map is injective. The import could be removed by stating the hypothesis as `Function.Injective (algebraMap * *)` but it is not the usual spelling (and cannot be synthesized by Lean). In the end, it appears that the increased import only affects three files so maybe it's fine.~~ The PR also adds two new instances: - `FiniteDimensional (FractionRing A) (FractionRing B)` deduced from `Module.Finite A B` when `B` is a Dedekind domain. - `IsScalarTower (FractionRing A) (FractionRing B) (FractionRing C)` deduced from `IsScalarTower A B C` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-algebra
label:t-algebra$
207/4 Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean 5 13 ['erdOne', 'github-actions', 'xroblot'] nobody
2-57173
2 days ago
5-57936
5 days ago
10-54945
10 days
25832 xroblot
author:xroblot
feat(FieldTheory/LinearDisjoint): `trace` (resp. `norm`) and `algebraMap` commutes For `A` and `B` two linearly disjoint `R`-subalgebras in a commutative algebra `S` and `b` a `R`-basis of `B`, we construct a `A`-basis of `S = A ⊔ B` from `b` (and a similar construction using a `R`-basis of `A`). Then, we prove in this situation that `trace` commutes with `algebraMap`, that is: ```lean Algebra.trace A S (algebraMap B S x) = algebraMap R A (Algebra.trace R B x) ``` and a similar result for the norm. We also add a similar basis construction for `A` and `B` two linearly disjoint intermediate fields with the hypothesis that `A.toSubalgebra ⊔ B.toSubalgebra = ⊤`. This hypothesis is equivalent to `A ⊔ B = ⊤` in many cases (for example, one of the two extensions is algebraic over the base field) but not always. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-algebra
label:t-algebra$
161/9 Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/RingTheory/LinearDisjoint.lean 2 23 ['acmepjz', 'github-actions', 'xroblot'] nobody
2-56869
2 days ago
11-76449
11 days ago
19-21436
19 days
26545 pechersky
author:pechersky
chore(RingTheory/Valuation): generalize lemmas about valuation of irreducibles in subring To prepare for generalization of LocallyCompact to Valued from NormedField --- [![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$
94/33 Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/Valuation/Integers.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean 3 1 ['github-actions'] nobody
2-53240
2 days ago
2-53288
2 days ago
2-53295
2 days
26357 javra
author:javra
feat(CategoryTheory): linear categories as `ModuleCat R`-enriched categories Continues #23826. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import 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 1 ['github-actions'] nobody
2-52350
2 days ago
8-55734
8 days ago
8-55787
8 days
26351 RemyDegenne
author:RemyDegenne
feat: covering and packing numbers of sets in a metric space We define covering numbers of sets in a pseudo-metric space, which are minimal cardinalities of `ε`-covers of sets. We also define the packing number, which is the maximal cardinality of an `ε`-separated set. From the Brownian motion project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 261/0 Mathlib.lean,Mathlib/Topology/MetricSpace/CoveringNumbers.lean 2 4 ['ADedecker', 'YaelDillies', 'github-actions'] nobody
2-51833
2 days ago
8-69459
8 days ago
8-69507
8 days
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
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
2-51477
2 days ago
2-51479
2 days ago
5-33961
5 days
26498 EtienneC30
author:EtienneC30
feat: projections and injections for WithLp Introduce `WithLp.fst` and `WithLp.snd` to avoid defeq abuse by writing `x.1` when `x : WithLp p (α × β)`. Also add a `ContinuousLinearMap` version. Introduce `WithLp.inl` (resp. `WithLp.inr`) as a linear isometry from `α` (resp. β) to `WithLp p (α × β)`. Introduce `PiLp.single` as a linear isometry from `β i` to `PiLp p β`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 107/7 Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/LinearAlgebra/Pi.lean 4 6 ['EtienneC30', 'b-mehta', 'eric-wieser', 'github-actions'] nobody
2-50104
2 days ago
3-52687
3 days ago
4-17832
4 days
26277 AntoineChambert-Loir
author:AntoineChambert-Loir
feat(RingTheory/Congruence/Hom): prove basic isomorphisms theorems for ring congruences This file contains elementary definitions involving congruence relations and morphisms for semirings, rings, and algebras. * `RingCon.ker`: the kernel of a monoid homomorphism as a congruence relation * `RingCon.lift`, `RingCon.liftₐ`: the homomorphism / the algebra morphism on the quotient given that the congruence is in the kernel * `RingCon.map`, `RingCon.mapₐ`: homomorphism / algebra morphism from a smaller to a larger quotient * `RingCon.quotientKerEquivRangeS`, `RingCon.quotientKerEquivRange`, `RingCon.quotientKerEquivRangeₐ` : the first isomorphism theorem for semirings (using `RingHom.rangeS`), rings (using `RingHom.range`) and algebras (using `AlgHom.range`). * `RingCon.comapQuotientEquivRangeS`, `RingCon.comapQuotientEquivRange`, `RingCon.comapQuotientEquivRangeₐ` : the second isomorphism theorem for semirings (using `RingHom.rangeS`), rings (using `RingHom.range`) and algebras (using `AlgHom.range`). * `RingCon.quotientQuotientEquivQuotient`, `RingCon.quotientQuotientEquivQuotientₐ` : the third isomorphism theorem for semirings (or rings) and algebras It is an adaptation of what existed for multiplicative congruences (docs#Con) and is only useful for semirings which are not rings. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
555/2 Mathlib.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Congruence/Defs.lean,Mathlib/RingTheory/Congruence/Hom.lean 6 1 ['github-actions'] nobody
2-46708
2 days ago
10-25795
10 days ago
10-25844
10 days
25945 adomani
author:adomani
feat: the empty line in commands linter This linter flags empty lines within a command. It allows empty lines within doc-strings, module-docs and a couple of other "sensible" places. It also skips files that are likely to contain meta-code, since there the use of empty lines in definition is more widespread. This PR continues the work from #25236. large-import maintainer-merge 375/5 Mathlib.lean,Mathlib/CategoryTheory/Comma/StructuredArrow/CommaMap.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/EmptyLine.lean,MathlibTest/EmptyLine.lean 6 3 ['adomani', 'github-actions'] nobody
2-45397
2 days ago
16-78014
16 days ago
16-78069
16 days
26521 YaelDillies
author:YaelDillies
chore(Algebra/BigOperators): rename variables away from greek letters Uniformise the variables to `ι`, `κ` for the indexing types, `M`, `N` for monoids, `G` for groups, `M₀` for monoids with zero, `R` for (semi)rings. Also delete a duplicated lemma which suddenly became problematic. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
442/456 Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Action.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/BigOperators/Sym.lean,Mathlib/Algebra/BigOperators/WithTop.lean,Mathlib/Data/Complex/Exponential.lean,Mathlib/FieldTheory/Finite/Polynomial.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean,Mathlib/NumberTheory/SumPrimeReciprocals.lean 22 7 ['YaelDillies', 'b-mehta', 'github-actions'] nobody
2-42034
2 days ago
2-42034
2 days ago
2-42050
2 days
26035 fbarroero
author:fbarroero
feat(Analysis/Polynomial/MahlerMeasure): the Mahler measure of a complex polynomial We introduce the Mahler measure of a complex polynomial and prove some basic facts. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 127/1 Mathlib.lean,Mathlib/Analysis/Polynomial/MahlerMeasure.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean 3 1 ['github-actions'] nobody
2-37690
2 days ago
14-44940
14 days ago
14-44945
14 days
25951 themathqueen
author:themathqueen
feat(Analysis/InnerProductSpace/MulOpposite): defines the inner product on opposite spaces This pr defines the inner product on opposite spaces. - [ ] depends on #25949 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 117/0 Mathlib.lean,Mathlib/Analysis/InnerProductSpace/MulOpposite.lean,Mathlib/LinearAlgebra/Basis/MulOpposite.lean 3 1 ['github-actions'] nobody
2-35959
2 days ago
16-66182
16 days ago
16-66175
16 days
26543 vihdzp
author:vihdzp
feat(SetTheory/ZFC/VonNeumann): von Neumann hierarchy of sets Ported from #17027. For extra discussion on this PR, see [Zulip](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2317027.20.2C.20.2326518.20von.20Neumann.20hierarchy/with/526389347). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-set-theory maintainer-merge 133/0 Mathlib.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/VonNeumann.lean 4 55 ['alreadydone', 'github-actions', 'kckennylau', 'vihdzp'] nobody
2-26363
2 days ago
2-26604
2 days ago
2-56144
2 days
25910 themathqueen
author:themathqueen
feat(Algebra/Ring/Idempotent): for idempotent `p,q`, `q-p` is idempotent iff `pq=p=qp` Added useful lemmas for idempotents and projections. Main result: - IsIdempotentElem.sub_iff: if `p` and `q` are idempotent elements, then `q - p` is idempotent iff `p * q = p = q * p` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
89/0 Mathlib/Algebra/Ring/Idempotent.lean,Mathlib/LinearAlgebra/Projection.lean 2 23 ['github-actions', 'tb65536', 'themathqueen'] nobody
2-24112
2 days ago
2-84169
2 days ago
5-31932
5 days
26404 grunweg
author:grunweg
chore: clean up and remove FunProp/Differentiable - one lemma in that file already exists, hence can be removed (We don't add a deprecation as I presume people will not have used it.) - move the three remaining lemmas in that file to their proper place, and use the now `fun_` naming convention (Omitting deprecations again.) - after this, `FunProp/Differentiable` is empty and need not be imported any more: add a module deprecation --- - [x] depends on: #26355 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) tech debt 23/49 Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Tactic/FunProp/ContDiff.lean,Mathlib/Tactic/FunProp/Differentiable.lean,MathlibTest/fun_prop2.lean 4 3 ['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot'] nobody
2-19512
2 days ago
7-45278
7 days ago
7-45324
7 days
25947 qawbecrdtey
author:qawbecrdtey
feat(Data/Nat/Factors): added lemmas including `primeFactorsList_length_ne_zero` --- Added lemmas `primeFactorsList_length_ne_zero`, `primeFactorsList_prime_iff`, and `primeFactorsList_length_eq_one`. ```lean theorem primeFactorsList_length_ne_zero (n : ℕ) : n.primeFactorsList.length ≠ 0 ↔ 2 ≤ n theorem primeFactorsList_prime_iff {p : ℕ} : p.primeFactorsList = [p] ↔ p.Prime @[simp] theorem primeFactorsList_length_eq_one (n : ℕ) : n.primeFactorsList.length = 1 ↔ n.Prime ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 21/3 Mathlib/Data/Nat/Factors.lean 1 5 ['Ruben-VandeVelde', 'github-actions', 'qawbecrdtey'] nobody
2-15150
2 days ago
16-65977
16 days ago
16-74580
16 days
26483 metakunt
author:metakunt
feat (RingTheory/RootsOfUnity/PrimitiveRoots) : Add equiv_primitiveRoots_of_coprimePow Adds equivalence of r-th primitive roots by a coprime e. new-contributor t-algebra
label:t-algebra$
79/0 Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean 1 6 ['Citronhat', 'github-actions', 'metakunt'] nobody
2-12348
2 days ago
5-28708
5 days ago
5-28754
5 days
26552 Komyyy
author:Komyyy
feat: equivalent condition for subgroups to be simple And simpleness of isomorphic groups are equivalent. Required to prove that A_n is simple iff n = 3 or 5 ≤ n(#26051). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
23/1 Mathlib/GroupTheory/Subgroup/Simple.lean 1 1 ['github-actions'] nobody
2-9485
2 days ago
2-43510
2 days ago
2-43496
2 days
26555 Komyyy
author:Komyyy
feat: lemmas about betweeness on a linear space This PR also adds aliases of the inverse direction of betweeness iff lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-euclidean-geometry 86/0 Mathlib/Analysis/Convex/Between.lean 1 1 ['github-actions'] nobody
2-9386
2 days ago
2-37381
2 days ago
2-40591
2 days
26571 dupuisf
author:dupuisf
chore: Add grind tags for `Set.mem_Ixx` This adds `grind` tags to the various `Set.mem_Ixx` lemmas, which should let the grind linarith module discharge goals of this form. I went with the convervative option of only including the `grind =` pattern, which only fires on the LHS of these lemmas. One could also consider having patterns going the other way as well (i.e. `grind _=_` for `mem_Ioi` or multi-patterns for `mem_Ioo` and so on). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order 8/8 Mathlib/Order/Interval/Set/Defs.lean 1 1 ['github-actions'] nobody
2-3243
2 days ago
2-3316
2 days ago
2-3301
2 days
26536 peterjunglas
author:peterjunglas
fix (Data/Matrix/Rank): extend applicability of rank_submatrix_le The current version of `rank_submatrix_le` is restricted to square matrices and doesn't allow for the reduction of lines. Both restrictions can be removed easily without changing the proof. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor 3/2 Mathlib/Data/Matrix/Rank.lean 1 1 ['github-actions', 'mbkybky'] nobody
1-77713
1 day ago
2-72562
2 days ago
2-72607
2 days
26541 YaelDillies
author:YaelDillies
chore: rename `ZMod.natCast_zmod_eq_zero_iff_dvd` to `ZMod.natCast_eq_zero_iff` This matches `CharP.cast_eq_zero_iff` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 20/18 Archive/Imo/Imo2024Q2.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/NumberTheory/Fermat.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/NumberTheory/Padics/RingHoms.lean,Mathlib/NumberTheory/SumFourSquares.lean,Mathlib/NumberTheory/Wilson.lean,Mathlib/RingTheory/Fintype.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/RootsOfUnity/Minpoly.lean 11 1 ['github-actions'] nobody
1-76666
1 day ago
1-76666
1 day ago
2-63550
2 days
26378 EtienneC30
author:EtienneC30
feat: inner product against funBasis Also remove the `simp` attribute off [PiLp.inner_apply](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/InnerProductSpace/PiL2.html#PiLp.inner_apply). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 17/7 Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/RCLike/Inner.lean 2 3 ['EtienneC30', 'eric-wieser', 'github-actions'] nobody
1-64015
1 day ago
1-64235
1 day ago
8-25772
8 days
26550 Komyyy
author:Komyyy
chore: declare `T₀ ∧ R₀ → T₁` as an instance As [instT2SpaceOfR1SpaceOfT0Space](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Separation/Hausdorff.html#instT2SpaceOfR1SpaceOfT0Space). I forgot to do this in my PR(#26064). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology easy 1/2 Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/GDelta.lean 2 4 ['ADedecker', 'github-actions', 'leanprover-bot'] nobody
1-61469
1 day ago
2-44839
2 days ago
2-44825
2 days
26560 b-mehta
author:b-mehta
chore(Topology/LiminfLimsup): split out non-algebraic content from Topology/Algebra file All the moved content had no algebraic material (in particular required no algebraic imports), so we move it out of Topology/Algebra. This increases discoverability and improves the global organisation of `Topology/`, and gives a net import decrease across mathlib. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 411/382 Mathlib.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Normed/Group/Ultra.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/MeasureTheory/Integral/BoundedContinuousFunction.lean,Mathlib/Order/Filter/ENNReal.lean,Mathlib/Topology/Algebra/Order/LiminfLimsup.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean,Mathlib/Topology/Order/LiminfLimsup.lean 10 1 ['github-actions'] nobody
1-51201
1 day ago
2-31479
2 days ago
2-31548
2 days
26587 faenuccio
author:faenuccio
feat(RingTheory/Valuation/Discrete/Basic.lean): add Nontriviality instances for discrete valuations Co-authored by: María Inés de Frutos Fernández @mariainesdff --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
24/0 Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean 2 1 ['github-actions'] nobody
1-46260
1 day ago
1-52767
1 day ago
1-52824
1 day
26300 igorkhavkine
author:igorkhavkine
feat(Analysis/Calculus/FDeriv): continuous differentiability from continuous partial derivatives on an open domain in a product space If a function `f : E × F → G` is continuously differentiable, then its partial derivatives along `E` and `F` are also continuous. The non-trivial converse implication holds when the partial derivatives are continuous on an open domain, and they can be added together to give the total derivative of `f`. See this [#mathlib4 > Partial derivatives @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Partial.20derivatives/near/520995477) and the containing thread for some discussion. The PR creates a new import (`Mathlib.Analysis.Calculus.FDeriv.Partial`), where other results about partial derivatives could go in the future. --- *this is the migration of #25304 to the PR-from-fork workflow* - [x] depends on: #25564 - [x] depends on: #26273 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-analysis 309/0 Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean 2 3 ['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot'] nobody
1-42912
1 day ago
6-74986
6 days ago
7-60725
7 days
25919 BoltonBailey
author:BoltonBailey
doc: suggest !bench in `lake exe pole` This PR makes an error message on `lake exe pole` give some information which is often relevant. Original PR: https://github.com/leanprover-community/mathlib4/pull/12561 maintainer-merge 2/1 LongestPole/Main.lean 1 3 ['BoltonBailey', 'Ruben-VandeVelde', 'github-actions'] nobody
1-42882
1 day ago
1-71698
1 day ago
17-47587
17 days
25970 wwylele
author:wwylele
feat(RingTheory): decompose archimedean classes of HahnSeries In preparation for #25140, this connects archimedean class and HahnSeries --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import 493/2 Mathlib.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/Lex.lean,Mathlib/Order/Hom/WithTopBot.lean,Mathlib/RingTheory/HahnSeries/Lex.lean 6 2 ['ScottCarnahan', 'github-actions'] nobody
1-39284
1 day ago
16-37193
16 days ago
16-37238
16 days
26594 metakunt
author:metakunt
feat(Algebra/Polynomial/ZMod): Add Polynomial.equiv_of_nat_of_polynomial_zmod This adds an explicit bijection between the naturals and $$\mathbb{Z}/n\mathbb{Z}[X]$$ in a canonical way. --- I feel that some API is missing to make the theorem shorter, I have no idea what lemmas to extract though. Also I don't know when to use spaces and when not, so I did it best effort. new-contributor t-algebra
label:t-algebra$
465/0 Mathlib.lean,Mathlib/Algebra/Polynomial/ZMod.lean 2 1 ['github-actions'] nobody
1-38387
1 day ago
1-39417
1 day ago
1-39466
1 day
26114 wwylele
author:wwylele
feat(Data/Real): add embedding of archimedean groups into Real This is part of https://github.com/leanprover-community/mathlib4/pull/25140, and is the special case of Hahn embedding theorem applied to archimedean group. ---- This PR continues the work from #25157. Original PR: https://github.com/leanprover-community/mathlib4/pull/25157 t-data 231/0 Mathlib.lean,Mathlib/Data/Rat/Lemmas.lean,Mathlib/Data/Real/Embedding.lean 3 21 ['ScottCarnahan', 'github-actions', 'wwylele'] nobody
1-38261
1 day ago
14-40696
14 days ago
14-40744
14 days
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 381/0 scripts/README.md,scripts/create_deprecated_modules.lean 2 47 ['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant'] grunweg
assignee:grunweg
1-37456
1 day ago
1-37477
1 day ago
22-64118
22 days
26544 vihdzp
author:vihdzp
feat(SetTheory/ZFC/Ordinal): Lean ordinals to ZFC ordinals We define `Ordinal.toZFSet` and prove that its outputs are precisely the ZFC ordinals. Moved from #19985. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-set-theory 151/4 Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Ordinal.lean,Mathlib/SetTheory/ZFC/PSet.lean,Mathlib/SetTheory/ZFC/Rank.lean 4 1 ['github-actions'] nobody
1-37442
1 day ago
2-53111
2 days ago
2-54494
2 days
25841 mitchell-horner
author:mitchell-horner
feat(Combinatorics/SimpleGraph): prove the Kővári–Sós–Turán theorem Prove the Kővári–Sós–Turán theorem for simple graphs: the `(completeBipartiteGraph α β).Free` simple graphs for `card α ≤ card β` on the vertex type `V` have at most `(card β-1)^(1/(card α))*(card V)^(2-1/(card α))/2 + (card V)*(card α-1)/2` edges. --- - [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/) --- *This PR continues the work from #20240.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/20240* t-combinatorics 289/0 Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/KovariSosTuran.lean 3 2 ['github-actions', 'mathlib4-dependent-issues-bot'] awainverse
assignee:awainverse
1-32786
1 day ago
19-55327
19 days ago
19-55374
19 days
25843 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/) --- *This PR continues the work from #24948.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24948* t-combinatorics 95/0 Mathlib/Combinatorics/SimpleGraph/Bipartite.lean 1 1 ['github-actions'] nobody
1-32755
1 day ago
19-54929
19 days ago
19-54915
19 days
26597 sahanwijetunga
author:sahanwijetunga
Update Orthogonal.lean fixed documentation for orthogonal (regarding order of inputs to bilinear form) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
3/3 Mathlib/LinearAlgebra/BilinearForm/Orthogonal.lean 1 1 ['github-actions'] nobody
1-32398
1 day ago
1-32399
1 day ago
1-32450
1 day
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 7 ['Pazzaz', 'Ruben-VandeVelde', 'github-actions', 'grunweg', 'mariainesdff'] nobody
1-27231
1 day ago
75-46007
2 months ago
75-46060
75 days
25882 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 - [x] depends on: #21733 - [x] depends on: #21735 - [x] depends on: #21736 - [x] depends on: #21738 - [ ] depends on: #25868 - [ ] depends on: #25873 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *This PR continues the work from #21755.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/21755* large-import t-algebra
label:t-algebra$
163/0 Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean 1 n/a ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
1-25373
1 day ago
unknown
unknown
26596 BoltonBailey
author:BoltonBailey
refactor(Probability/ProbabilityMassFunction): Make constructions use NNReal This refactor makes the functions for Bernoulli/Binomial random variables take an NNReal parameter, rather than an ENNReal. This is convenient, since we have to prove `p \le 1` anyway, and this can now be done with `field_simp` for explicit p. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-measure-probability 24/18 Mathlib/Probability/ProbabilityMassFunction/Binomial.lean,Mathlib/Probability/ProbabilityMassFunction/Constructions.lean,Mathlib/Probability/ProbabilityMassFunction/Integrals.lean 3 1 ['github-actions', 'nomeata'] nobody
1-22900
1 day ago
1-32485
1 day ago
1-32539
1 day
25758 YaelDillies
author:YaelDillies
chore: shortcut instance `CompleteLattice α → PartialOrder α` This avoids using the path `CompleteLattice α → CompletePartialOrder α → PartialOrder α` that goes through `Order.CompletePartialOrder` and makes it appear used to our automation, such as `shake` or `#min_imports`. This is a followup to #25358. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order 7/0 Mathlib/Order/CompleteLattice/Defs.lean 1 6 ['Ruben-VandeVelde', 'eric-wieser', 'github-actions', 'leanprover-bot'] nobody
1-19893
1 day ago
1-21918
1 day ago
20-72505
20 days
25715 kbuzzard
author:kbuzzard
feat: more RestrictedProduct API A constructor, more algebra boilerplate (e.g. `SMul ℕ` on a restricted product of `AddMonoid`s, restricted product of `CommMonoid`s is a `CommMonoid`, restricted product of `R`-modules wrt `R`-submodules is an `R`-module, variant of `map` when the index set doesn't change. From the FLT project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) FLT t-topology 91/36 Mathlib/Topology/Algebra/RestrictedProduct/Basic.lean 1 13 ['ADedecker', 'github-actions', 'kbuzzard', 'matthewjasper'] nobody
1-17146
1 day ago
21-20004
21 days ago
21-23806
21 days
26603 vihdzp
author:vihdzp
refactor(SetTheory/Ordinal/FixedPoint): redefine `Ordinal.deriv` We previously defined the [ordinal derivative](https://en.wikipedia.org/wiki/Normal_function#Properties) of a function as the unique normal function satisfying `deriv f 0 = nfp f 0` and `deriv f (o + 1) = nfp f (deriv f o)` (where `nfp f a` is the next fixed point of `f` that's `≥ a`). The motivation here was to give a "nice" junk value on non-normal functions (the derivative is normal no matter what). However, in practice, this definition makes it unwieldy to prove things, by either requiring a tedious zero/successor/limit argument, or requiring one to rewrite `deriv f = enumOrd (fixedPoints f)`. We can instead define `deriv f = enumOrd (fixedPoints f)`. At the cost of giving "worse" junk values (which we have no legitimate uses of), we're able to much more easily prove all the expected properties in the standard case where `f` is a normal function. Finally, we do some drive-by API cleanup. Moved from #21858. --- The GitHub diff is a bit messy, I made my best to clean it up. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-set-theory 172/197 Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Veblen.lean 3 1 ['github-actions'] nobody
1-14033
1 day ago
1-14033
1 day ago
1-14064
1 day
26608 vihdzp
author:vihdzp
feat(SetTheory/Cardinal/Aleph): `o.card ≤ ℵ_ o` and variants --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-set-theory 25/0 Mathlib/SetTheory/Cardinal/Aleph.lean 1 1 ['github-actions'] nobody
1-9413
1 day ago
1-9471
1 day ago
1-10220
1 day
26392 winstonyin
author:winstonyin
feat: solution to ODE is Lipschitz with respect to the initial condition This PR continues the work from #20733. Original PR: https://github.com/leanprover-community/mathlib4/pull/20733 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. - [x] depends on: #26382 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-dynamics t-analysis 127/1 Mathlib/Analysis/ODE/PicardLindelof.lean 1 10 ['AntoineChambert-Loir', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'winstonyin'] nobody
1-8798
1 day ago
2-54973
2 days ago
2-56036
2 days
26610 vihdzp
author:vihdzp
chore: fix minor docstring mistake LHS → RHS --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order easy 1/1 Mathlib/Order/IsNormal.lean 1 1 ['github-actions'] nobody
1-8221
1 day ago
1-8283
1 day ago
1-8277
1 day
26607 vihdzp
author:vihdzp
feat(SetTheory/Cardinal/Aleph): characterization of initial successor ordinals --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-set-theory 9/0 Mathlib/SetTheory/Cardinal/Aleph.lean 1 2 ['github-actions', 'vihdzp'] nobody
1-7693
1 day ago
1-10255
1 day ago
1-10302
1 day
26617 vihdzp
author:vihdzp
feat(Data/Sum/Order): `toLex` as a `RelIso` As [requested](https://github.com/leanprover-community/mathlib4/pull/20409#discussion_r1903319844) by @eric-wieser in #20409. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data t-order 26/0 Mathlib/Data/Sum/Order.lean 1 1 ['github-actions'] nobody
1-3645
1 day ago
1-3664
1 day ago
1-3929
1 day
26488 yuanyi-350
author:yuanyi-350
add some lemmas about `Nat.gcd` add some lemmas about `Nat.gcd` $lcm(\frac{k}{m}, \frac{k}{n}) = k / \gcd(m, n)$ --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra easy
label:t-algebra$
23/1 Mathlib/Data/Nat/GCD/Basic.lean 1 6 ['github-actions', 'vihdzp', 'wwylele'] nobody
1-971
1 day ago
4-64132
4 days ago
4-64333
4 days
25961 artie2000
author:artie2000
feat(Aesop): Improve SetLike ruleset * Make some Aesop rules in the SetLike ruleset unsafe * Register new rules with the Aesop SetLike ruleset, by analogy with existing ones * Add new rules like `mem_closure_of_mem` by analogy with #26162 to improve performance in proving membership of closures. Before this PR, to prove something like `x ∈ s ⊢ x ∈ closure s`, Aesop would have to try the rule `mem_of_subset`, creating a metavariable that it would then try to fill with `subset_closure` . Obviously this was pretty inefficient, and the new lemma `mem_closure_of_mem` is a much more usable Aesop rule. * Update some Aesop rules' probabilities * Add new library note [SetLike Aesop ruleset] explaining the principles behind the new design The design note stipulates that `safe`-phase Aesop rules are to also be `simp` rules; this change has been split into #26175 --- Original PR: https://github.com/leanprover-community/mathlib4/pull/20477 - [x] depends on: #26162 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-algebra t-meta
label:t-algebra$
64/18 Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/Polynomial/Module/AEval.lean,Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Geometry/Convex/Cone/Basic.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/Order/BooleanSubalgebra.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/Tactic/SetLike.lean,Mathlib/Topology/Algebra/StarSubalgebra.lean 15 34 ['YaelDillies', 'artie2000', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'linesthatinterlace', 'mathlib4-dependent-issues-bot'] nobody
0-81594
22 hours ago
0-81594
22 hours ago
9-21262
9 days
26021 vasnesterov
author:vasnesterov
feat(Data/Real): representation of reals from `[0, 1]` in positional system * Introduce `ofDigits {b : ℕ} (digits : ℕ → Fin b) : ℝ`, representing a real number of the form `0.d₀d₁d₂...` (where `dᵢ = digits i`) as an infinite sum. * Prove that this sum converges to a number in the interval `[0, 1]`. * Prove `ofDigits_close_of_common_prefix`: if the first `n` digits of two numbers are equal, then their difference is bounded by `b⁻ⁿ`. * Introduce `toDigits`, which converts a real number into its sequence of digits. * Prove that `ofDigits (toDigits x b) = x`. [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/Base.20n.20expansion.20of.20real.20numbers.3F/near/502937293) --- - [x] depends on: #26004 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 238/0 Mathlib.lean,Mathlib/Data/Real/OfDigits.lean,scripts/noshake.json 3 11 ['alreadydone', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'vasnesterov', 'wwylele'] nobody
0-80742
22 hours ago
1-4705
1 day ago
1-5265
1 day
25754 robin-carlier
author:robin-carlier
feat(CategoryTheory/Monoidal/ExternalProduct): external product of pointwise left Kan extensions of functors Given a functor `H' : D' ⥤ V` to a monoidal category that is a pointwise left Kan 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 a pointwise left Kan extension 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`. --- - [x] depends on: #25731 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *This PR continues the work from #24989.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24989* t-category-theory 242/93 Mathlib.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct/Basic.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct/KanExtension.lean 5 7 ['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'robin-carlier'] nobody
0-70894
19 hours ago
1-41301
1 day ago
13-81558
13 days
26556 fweth
author:fweth
feat(CategoryTheory/Topos): subobject classifier without limits Adds an alternative API for constructing a subobject classifier without reference to limits. This PR modifies two files: - `Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean`: Adds strengthened versions of two existing theorems: - `of_horiz_isIso_mono` (alongside the existing `of_horiz_isIso`) - `of_vert_isIso_mono` (alongside the existing `of_vert_isIso`) - `Mathlib/CategoryTheory/Topos/Classifier.lean`: Addresses the TODO (removed from the file): > Make API for constructing a subobject classifier without reference to limits (replacing `⊤_ C` with an arbitrary `Ω₀ : C` and including the assumption `mono truth`) This implementation accepts a monomorphism `truth : Ω₀ ⟶ Ω` such that for every monomorphism `m : U ⟶ X` there exists a pair `χ₀ : U ⟶ Ω₀` and `χ : X ⟶ Ω` which creates a pullback square and `χ` must be unique in that it admits such a pair. Given these assumptions, we construct an instance of the existing `Classifier` structure, alongside with a proof that `Ω₀` is terminal. Klaus Gy --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-category-theory 88/8 Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean,Mathlib/CategoryTheory/Topos/Classifier.lean 2 1 ['github-actions'] nobody
0-65231
18 hours ago
0-65778
18 hours ago
2-30722
2 days
26106 mbkybky
author:mbkybky
feat(RingTheory/Regular): flat base change of weakly regular sequence Show that [RingTheory.Sequence.IsWeaklyRegular](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Regular/RegularSequence.html#RingTheory.Sequence.IsWeaklyRegular) is stable under flat base change and [RingTheory.Sequence.IsRegular](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Regular/RegularSequence.html#RingTheory.Sequence.IsRegular) is stable under faithfully flat base change. - [x] depends on: #26297 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
151/6 Mathlib.lean,Mathlib/RingTheory/Flat/Basic.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/Regular/Flat.lean 4 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
0-57837
16 hours ago
0-68875
19 hours ago
0-68963
19 hours
26527 jsm28
author:jsm28
feat(LinearAlgebra/AffineSpace/Independent): `faceOpposite` point in 1-simplex Add a lemma about the point of `faceOpposite` applied to a 1-simplex. ```lean lemma faceOpposite_point_eq_point_rev (s : Simplex k P 1) (i : Fin 2) (n : Fin 1) : (s.faceOpposite i).points n = s.points i.rev := by ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra easy
label:t-algebra$
19/0 Mathlib/LinearAlgebra/AffineSpace/Independent.lean 1 14 ['eric-wieser', 'github-actions', 'jsm28'] nobody
0-52455
14 hours ago
3-23871
3 days ago
3-23856
3 days
25491 tannerduve
author:tannerduve
feat(Control/Monad/Free): define free monad, prove it lawful, and implement standard effects 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** 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 --- 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 maintainer-merge 717/0 Mathlib.lean,Mathlib/Control/Monad/Free.lean,MathlibTest/freemonad.lean,docs/references.bib 4 144 ['YaelDillies', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'plp127', 'quangvdao', 'tannerduve'] nobody
0-48708
13 hours ago
15-49970
15 days ago
25-69054
25 days
26484 peabrainiac
author:peabrainiac
feat(Geometry/Diffeology): basics of diffeological spaces Introduces diffeological spaces, smooth maps between them, the D-topology and the standard diffeology on finite-dimensional normed spaces. --- This PR continues the work from #21969. t-differential-geometry 473/0 Mathlib.lean,Mathlib/Geometry/Diffeology/Basic.lean,docs/references.bib,scripts/noshake.json 4 8 ['JovanGerb', 'github-actions', 'lecopivo', 'peabrainiac'] nobody
0-47965
13 hours ago
5-7021
5 days ago
5-11775
5 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. --- - [x] 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 372/444 Mathlib/CategoryTheory/Category/RelCat.lean,Mathlib/Combinatorics/Hall/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.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 5 ['YaelDillies', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot'] nobody
0-42878
11 hours ago
17-61813
17 days ago
17-71941
17 days
25920 BoltonBailey
author:BoltonBailey
feat(Data/Finsupp/Basic): `Finsupp.optionElim'` Similar to how Finsupp.cons constructs a map Fin (n + 1) →₀ M from a map Fin n →₀ M, we define Finsupp.optionElim' to construct a map Option α →₀ M from a map α →₀ M, given an additional value for none. We base this on the new optionEquiv definition. As a function, it behaves as Option.elim', hence the name. We prove a variety of API lemmas, based on those for Finsupp.cons, to bring the definitions more in line with the contents of Data/Finsupp/Fin. We also refactor to a new file to help avoid a too-long file and make this more analogous to Finsupp.cons Original PR: https://github.com/leanprover-community/mathlib4/pull/13861 - [x] depends on: #26309 migrated-from-branch t-data 125/26 Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Data/Finsupp/Option.lean 2 12 ['BoltonBailey', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot'] nobody
0-39872
11 hours ago
6-8393
6 days ago
8-32380
8 days
26272 ajirving
author:ajirving
feat(NumberTheory/LucasLehmer): prove converse direction to Lucas-Lehmer Proves the converse direction of the Lucas-Lehmer test, namely that the Lucas-Lehmer criterion is a necessary condition for a Mersenne prime. Adds a couple of examples of proving Mersenne numbers are composite using this. Proves that if `2^p-1` is prime then `p` is prime. --- * I wasn't sure how many examples to add given that there are many more Mersenne composites than primes. * There are a number of annoying coercions between different rings, any simplifications will be appreciated. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import new-contributor t-number-theory 226/5 Archive/Examples/MersennePrimes.lean,Mathlib/NumberTheory/LucasLehmer.lean 2 12 ['github-actions', 'kckennylau'] nobody
0-38173
10 hours ago
10-48558
10 days ago
10-48605
10 days
25989 Multramate
author:Multramate
feat(NumberTheory/EllipticDivisibilitySequence): add elliptic nets This PR continues the work from #25030. Original PR: https://github.com/leanprover-community/mathlib4/pull/25030 t-number-theory 259/37 Mathlib/NumberTheory/EllipticDivisibilitySequence.lean 1 3 ['MichaelStollBayreuth', 'Multramate', 'github-actions'] nobody
0-37316
10 hours ago
16-23946
16 days ago
16-23994
16 days
26072 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`. 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 9 ['MichaelStollBayreuth', 'github-actions', 'xroblot'] nobody
0-35076
9 hours ago
14-67800
14 days ago
14-73794
14 days
26638 metakunt
author:metakunt
chore: Add grind to cast_zero Add grind to cast_zero t-data new-contributor 1/1 Mathlib/Data/Nat/Cast/Defs.lean 1 1 ['github-actions'] nobody
0-34765
9 hours ago
0-34765
9 hours ago
0-36370
10 hours
26158 upobir
author:upobir
feat(NumberTheory/Divisors): add int divisors This PR continues the work from #25209. Original PR: https://github.com/leanprover-community/mathlib4/pull/25209 t-number-theory 125/4 Mathlib/NumberTheory/Divisors.lean 1 5 ['MichaelStollBayreuth', 'github-actions', 'upobir'] nobody
0-33492
9 hours ago
13-53842
13 days ago
13-53887
13 days
25917 BoltonBailey
author:BoltonBailey
docs: Add documentation to miscellaneous files This PR addresses a number of documentation linter instances. Original PR: https://github.com/leanprover-community/mathlib4/pull/23964 migrated-from-branch 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 2 ['BoltonBailey', 'github-actions'] nobody
0-31966
8 hours ago
15-37758
15 days ago
17-47787
17 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 14 ['eric-wieser', 'github-actions', 'madvorak'] nobody
0-31312
8 hours ago
52-56830
1 month ago
54-6658
54 days
26640 euprunin
author:euprunin
chore: golf Data/ using `grind` bench-after-CI t-data 19/127 Mathlib/Data/EReal/Operations.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/List/Indexes.lean,Mathlib/Data/List/Induction.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/Permutation.lean,Mathlib/Data/List/Sigma.lean,Mathlib/Data/PEquiv.lean,Mathlib/Data/PNat/Xgcd.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Data/Seq/Parallel.lean,Mathlib/Data/Seq/Seq.lean,Mathlib/Data/Set/Lattice.lean 14 1 ['github-actions'] nobody
0-31160
8 hours ago
0-31168
8 hours ago
0-31216
8 hours
26350 mans0954
author:mans0954
feature(RingTheory/RootsOfUnity/Basic) : rootsOfUnity coercions This PR continues the work from #25215. Original PR: https://github.com/leanprover-community/mathlib4/pull/25215 t-algebra
label:t-algebra$
22/0 Mathlib/RingTheory/RootsOfUnity/Basic.lean 1 2 ['github-actions', 'mans0954'] nobody
0-29655
8 hours ago
8-76560
8 days ago
8-76604
8 days
26347 mans0954
author:mans0954
feature(Data/Finset/RangeDistance): abs_sub_lt_of_mem_finset_range This PR continues the work from #23161. Original PR: https://github.com/leanprover-community/mathlib4/pull/23161 30/0 Mathlib.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Data/Finset/RangeDistance.lean 3 2 ['github-actions', 'mans0954'] nobody
0-29549
8 hours ago
8-76986
8 days ago
8-76970
8 days
26606 vihdzp
author:vihdzp
refactor(SetTheory/Cardinal/Regular): review `IsInaccessible` API This PR does the following: - Make the definition of `IsInaccessible` the more lightweight version. - Turn the old definition into a lemma `isInaccessible_def`. - Use dot notation wherever possible. - Add two extra convenience lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-set-theory 32/8 Mathlib/SetTheory/Cardinal/Regular.lean 1 3 ['b-mehta', 'github-actions', 'vihdzp'] nobody
0-29471
8 hours ago
1-13046
1 day ago
1-13092
1 day
26639 euprunin
author:euprunin
chore: golf Analysis/ using `grind` t-analysis 16/63 Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Convex/BetweenList.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Analysis/SpecialFunctions/Complex/Log.lean,Mathlib/Analysis/SpecialFunctions/Pow/Complex.lean,Mathlib/Analysis/SpecificLimits/Normed.lean 12 5 ['github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] nobody
0-28965
8 hours ago
0-28965
8 hours ago
0-33565
9 hours
26538 mariainesdff
author:mariainesdff
feat(RingTheory/Valuation/Extension): add algebra instances Provide algebra instances for valuation subrings and residue fields. Co-authored-by: @faenuccio --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-algebra
label:t-algebra$
54/4 Mathlib/RingTheory/Valuation/Extension.lean 1 11 ['github-actions', 'mariainesdff', 'pechersky'] nobody
0-25985
7 hours ago
2-67340
2 days ago
2-67388
2 days
9915 eric-wieser
author:eric-wieser
refactor: Add norm_num machinery for NNRat This splits the previous `isRat` primitive into `isNNRat` and `isNegNNRat`, where only the latter carries around a `DivisionRing` instance. This means that `norm_num` works on `NNReal` and `NNRat`. --- - [x] depends on: #9951 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra t-meta
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 7 ['eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'plp127'] nobody
0-21966
6 hours ago
5-40714
5 days ago
5-40706
5 days
26563 winstonyin
author:winstonyin
chore: rename `IsIntegralCurve` to `IsMIntegralCurve` I rename all the existing `IsIntegralCurve` series of definitions and lemmas for manifolds to `IsMIntegralCurve` in preparation for reusing `IsIntegralCurve` for the vector space version. - [ ] depends on: #26533 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-differential-geometry 320/165 Mathlib/Geometry/Manifold/IntegralCurve/Basic.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Geometry/Manifold/IntegralCurve/Transform.lean,Mathlib/Geometry/Manifold/IntegralCurve/UniformTime.lean,docs/overview.yaml 5 8 ['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'winstonyin'] grunweg
assignee:grunweg
0-21791
6 hours ago
0-21970
6 hours ago
0-61394
17 hours
26614 Rida-Hamadani
author:Rida-Hamadani
feat(SimpleGraph): add more API for `take`/`drop` These came up while proving the Girth-Diameter inequality. The main lemma proves that taking `n` vertices of a walk results in a sub-walk of taking `k` vertices when `n` is less than or equal to `k`. The sub-walk relation is represented as `p.support.Sublist q.support` where `p` and `q` are walks. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 74/4 Mathlib/Combinatorics/SimpleGraph/Walk.lean 1 10 ['Rida-Hamadani', 'b-mehta', 'github-actions'] nobody
0-19863
5 hours ago
1-6004
1 day ago
1-6053
1 day
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/) new-contributor t-algebra
label:t-algebra$
13/0 Mathlib/FieldTheory/RatFunc/Basic.lean 1 32 ['ShouxinZhang', 'eric-wieser', 'github-actions', 'joneugster', 'kckennylau', 'plp127'] nobody
0-15473
4 hours ago
2-28329
2 days ago
81-4869
81 days
26313 kckennylau
author:kckennylau
feat: 4 lemmas about Finsupp.mapDomain.linearEquiv --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
9/0 Mathlib/LinearAlgebra/Finsupp/Defs.lean 1 5 ['eric-wieser', 'github-actions', 'kckennylau'] nobody
0-14141
3 hours ago
9-45624
9 days ago
9-45676
9 days
26314 kckennylau
author:kckennylau
feat: Finsupp.supportedEquivFinsupp_symm_single --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
15/1 Mathlib/Data/Finsupp/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Supported.lean 2 8 ['eric-wieser', 'github-actions', 'kckennylau'] nobody
0-14134
3 hours ago
3-50382
3 days ago
5-24927
5 days
26644 kckennylau
author:kckennylau
feat(SetTheory/ZFC): Define the language of sets and state the ZFC axioms --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-set-theory 334/0 Mathlib.lean,Mathlib/SetTheory/ZFC/Axioms.lean,docs/references.bib 3 1 ['github-actions'] nobody
0-13426
3 hours ago
0-19926
5 hours ago
0-19976
5 hours
26646 eric-wieser
author:eric-wieser
feat(TensorProduct): add a Repr --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra t-meta
label:t-algebra$
8/0 Mathlib/LinearAlgebra/TensorProduct/Basic.lean 1 1 ['github-actions'] nobody
0-12180
3 hours ago
0-12180
3 hours ago
0-12234
3 hours
26370 b-mehta
author:b-mehta
chore(Archive): golf and generalise ascending-descending sequences This proof was 5 years old, not in a good generality, and overly long. We fix the latter two points. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 96/120 Archive/Wiedijk100Theorems/AscendingDescendingSequences.lean 1 12 ['b-mehta', 'github-actions', 'grunweg'] nobody
0-8991
2 hours ago
6-66936
6 days ago
8-35476
8 days
26648 eric-wieser
author:eric-wieser
chore(TensorProduct): remove more `suppress_compilation`s --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) tech debt t-algebra
label:t-algebra$
3/7 Mathlib/LinearAlgebra/CliffordAlgebra/Prod.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/External.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean 3 4 ['eric-wieser', 'github-actions', 'leanprover-bot'] nobody
0-8960
2 hours ago
0-10862
3 hours ago
0-11530
3 hours
26641 euprunin
author:euprunin
chore: golf NumberTheory/ using `grind` t-number-theory 9/45 Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticChar/Basic.lean,Mathlib/NumberTheory/Multiplicity.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean,Mathlib/NumberTheory/Pell.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/PythagoreanTriples.lean,Mathlib/NumberTheory/SmoothNumbers.lean 9 4 ['dupuisf', 'github-actions', 'leanprover-bot'] nobody
0-7400
2 hours ago
0-7400
2 hours ago
0-29880
8 hours
26302 kebekus
author:kebekus
feat: introduce the Laplace operator This PR continues the work from #25441. Original PR: https://github.com/leanprover-community/mathlib4/pull/25441 t-analysis 333/0 Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/InnerProductSpace/Laplace.lean 4 37 ['github-actions', 'grunweg', 'kebekus', 'sgouezel'] nobody
0-6954
1 hour ago
5-77191
5 days ago
7-51430
7 days
26631 themathqueen
author:themathqueen
feat(Analysis/InnerProductSpace/Positive): a star projection operator is positive This shows that a star projection (i.e., a self-adjoint idempotent) operator is positive. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-analysis 17/0 Mathlib/Analysis/InnerProductSpace/Positive.lean 1 5 ['dupuisf', 'eric-wieser', 'github-actions'] nobody
0-6464
1 hour ago
0-48205
13 hours ago
0-48260
13 hours
26645 erdOne
author:erdOne
feat(RingTheory/PowerSeries): Construction of `Q` such that `P(Q(X)) = X` Co-authored-by: Junnosuke Koizumi Co-authored-by: Hyeon, Seung-Hyeon Co-authored-by: Yuichiro Taguchi This contribution was created as part of the ZMC conference 2025 "Anabelian Geometry and its Computer Formalization". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
133/0 Mathlib/RingTheory/PowerSeries/Substitution.lean 1 8 ['chrisflav', 'erdOne', 'github-actions', 'kckennylau'] nobody
0-582
9 minutes ago
0-17848
4 hours ago
0-17896
4 hours

New contributors' PRs on the review queue

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
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
60-45154
1 month ago
60-62224
1 month ago
62-30522
62 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
54-61926
1 month ago
130-7025
4 months ago
130-7015
130 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
54-60053
1 month ago
79-61323
2 months ago
79-61376
79 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
48-65226
1 month ago
48-66239
1 month ago
151-28343
151 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
45-24567
1 month ago
45-24567
1 month ago
78-61250
78 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
42-13705
1 month ago
70-11262
2 months ago
70-11315
70 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
36-28535
1 month ago
37-19947
1 month ago
37-20003
37 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
36-22177
1 month ago
36-22178
1 month ago
36-22232
36 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
36-2167
1 month ago
36-26610
1 month ago
36-28512
36 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
35-74803
1 month ago
36-50745
1 month ago
42-55140
42 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
30-62911
1 month ago
30-62911
1 month ago
133-16201
133 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
27-51994
27 days ago
27-58613
27 days ago
27-58666
27 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
24-61106
24 days ago
25-10006
25 days ago
25-10001
25 days
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
24-39270
24 days ago
24-39270
24 days ago
43-73083
43 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
23-69858
23 days ago
23-69858
23 days ago
46-85948
46 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
23-56163
23 days ago
32-39460
1 month ago
32-39458
32 days
25932 Garmelon
author:Garmelon
chore: remove acceptSuggestionOnEnter option Reverts #12749. Discussion on zulip: [#mathlib4 > propose removing module docstring code suggestion @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/propose.20removing.20module.20docstring.20code.20suggestion/near/452477171) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 0/1 .vscode/settings.json 1 1 ['github-actions'] nobody
17-37792
17 days ago
17-37863
17 days ago
17-37855
17 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 58 ['AntoineChambert-Loir', 'Louddy', 'github-actions', 'kbuzzard'] nobody
16-63218
16 days ago
49-71199
1 month ago
122-5328
122 days
26099 grunweg
author:grunweg
feat: add 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 is used in my bordism theory project. Co-authored by: @plp127 --- This PR was manually re-created (and migrated to a fork at the same time) from #22137, since that seemed easiest. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-topology 115/0 Mathlib/Data/Sum/Basic.lean,Mathlib/Topology/Constructions/SumProd.lean 2 1 ['github-actions'] nobody
14-51669
14 days ago
14-51729
14 days ago
14-51722
14 days
25949 themathqueen
author:themathqueen
feat(LinearAlgebra/Basis/MulOpposite): basis of an opposite space This adds the definition of `Basis.mulOpposite` and shows finite-dimensionality and freeness of `Hᵐᵒᵖ`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
48/0 Mathlib.lean,Mathlib/LinearAlgebra/Basis/MulOpposite.lean 2 1 ['github-actions'] nobody
14-29245
14 days ago
16-69554
16 days ago
16-69600
16 days
25874 themathqueen
author:themathqueen
feat(LinearAlgebra/InvariantSubmodule): invariant submodules Defining and proving some lemmas on invariant submodules. This is a (2-year late) port from leanprover-community/mathlib3#18289. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
176/0 Mathlib.lean,Mathlib/Algebra/Group/Commute/Units.lean,Mathlib/LinearAlgebra/GeneralLinearGroup.lean,Mathlib/LinearAlgebra/InvariantSubmodule.lean,Mathlib/LinearAlgebra/Projection.lean 5 1 ['github-actions'] nobody
14-28159
14 days ago
18-41785
18 days ago
18-41832
18 days
25858 themathqueen
author:themathqueen
feat(RingTheory/Coalgebra/MulOpposite): coalgebra instance for MulOpposite Adding an instance for `Aᵐᵒᵖ` being an `R`-coalgebra when `A` is. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
112/0 Mathlib.lean,Mathlib/RingTheory/Coalgebra/MulOpposite.lean 2 1 ['github-actions'] nobody
14-25436
14 days ago
18-57235
18 days ago
18-57281
18 days
26074 oliver-butterley
author:oliver-butterley
feat(Mathlib.Dynamics.BirkhoffSum): add 2 lemmas for birkhoffSum/birkhoffAverage concerning ae_eq observables If two observables are `ae_eq` then the birkhoffSum/birkhoffAverage of those observables are `ae_eq`. Motivation: - Generally it is useful to be able to swap to observables which are `ae_eq`. - Specifically this is useful to prove Birkhoff's pointwise ergodic theorem by first proving the result for integrable and measurable observables and then using this to deduce the result with just the requirement of integrable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-dynamics 44/0 Mathlib.lean,Mathlib/Dynamics/BirkhoffSum/QuasiMeasurePreserving.lean 2 10 ['github-actions', 'oliver-butterley', 'sgouezel'] nobody
13-69368
13 days ago
14-72876
14 days ago
14-72920
14 days
26156 oliver-butterley
author:oliver-butterley
feat(MeasureTheory.VectorMeasure) : add a definition of total variation for VectorMeasure This PR adds variation for any `VectorMeasure` using a supremum definition. Currently mathlib has `TotalVariation` defined for a signed measure using the Hahn-Jordan decomposition, but this doesn't generalise. Motivation: generally this is an important concept but specifically as a step for proving RMK in the complex case which in turn is a step to prove the spectral theorem. Co-authored-by: @yoh-tanimoto This PR was migrated from #25442. PR divided into smaller pieces, this is just the definition without additional lemmas. PRs adding further results related to variation are: * #26160 * #26165 * #26168 (shows that for `SignedMeasures` the two definitions of variation coincide) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 354/0 Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean 2 1 ['github-actions'] nobody
12-74816
12 days ago
13-55833
13 days ago
13-55883
13 days
26160 oliver-butterley
author:oliver-butterley
feat(MeasureTheory.VectorMeasure): add several lemmas which characterize variation Add the following lemmas concerning variation of a VectorMeasure: * `norm_measure_le_variation`: `‖μ E‖ₑ ≤ variation μ E`. * `variation_neg`: `(-μ).variation = μ.variation`. * `variation_zero`: `(0 : VectorMeasure X V).variation = 0`. * `absolutelyContinuous` Co-authored-by: @yoh-tanimoto Depends on * #26156 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 432/0 Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean 3 1 ['github-actions'] nobody
12-74760
12 days ago
13-53415
13 days ago
13-53467
13 days
26165 oliver-butterley
author:oliver-butterley
feat(MeasureTheory.VectorMeasure): add lemma which shows that variation of a `ℝ≥0∞` VectorMeasure is equal to itself Add a lemma for the variation of a VectorMeasure which tells that if `μ` is `VectorMeasure X ℝ≥0∞` then `variation μ = μ`. Co-authored-by: @yoh-tanimoto Depends on * #26160 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 467/0 Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean 3 1 ['github-actions'] nobody
12-74739
12 days ago
13-50811
13 days ago
13-50858
13 days
26168 oliver-butterley
author:oliver-butterley
feat(MeasureTheory.VectorMeasure) : variation defined as a supremum is equal to variation defined using the Hahn-Jordan decomposition. Add `signedMeasure_totalVariation_eq`: if `μ` is a `SignedMeasure` then variation defined as a supremum is equal to variation defined using the Hahn-Jordan decomposition. Co-authored-by: @yoh-tanimoto Depends on: * #26165 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 680/0 Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Equiv.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean 4 1 ['github-actions'] nobody
12-74725
12 days ago
13-49949
13 days ago
13-49997
13 days
25883 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/) --- *This PR continues the work from #24575.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24575* migrated-from-branch new-contributor 157/2 Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramMatrix.lean,Mathlib/MeasureTheory/Function/L2Space.lean 3 8 ['eric-wieser', 'github-actions', 'pfaffelh'] nobody
12-25073
12 days ago
18-26323
18 days ago
18-26677
18 days
26301 Ivan-Sergeyev
author:Ivan-Sergeyev
feat(LinearAlgebra/Matrix/Determinant/TotallyUnimodular): Empty matrices are totally unimodular. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
15/0 Mathlib/LinearAlgebra/Matrix/Determinant/TotallyUnimodular.lean 1 1 ['github-actions'] nobody
9-55116
9 days ago
9-55126
9 days ago
9-55171
9 days
26308 LessnessRandomness
author:LessnessRandomness
feat(Analysis.NormedSpace): add normalized vectors --- Add normalized vectors to Mathlib (zero vector for zero vector, the corresponding unit vectors for nonzero vectors) new-contributor t-analysis 65/0 Mathlib.lean,Mathlib/Analysis/NormedSpace/Normalized.lean 2 1 ['github-actions'] nobody
9-47221
9 days ago
9-47233
9 days ago
9-47279
9 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
label:t-algebra$
871/0 .vscode/settings.json,Mathlib.lean,Mathlib/RingTheory/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRingDimension.lean,Mathlib/RingTheory/RegularLocalRing.lean 5 5 ['Brian-Nugent', 'github-actions', 'mathlib4-dependent-issues-bot', 'yuanyi-350'] nobody
9-26563
9 days ago
10-21
10 days ago
10-886
10 days
26195 yuanyi-350
author:yuanyi-350
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$
161/1 Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/SuccPred.lean,Mathlib/GroupTheory/Perm/Fin.lean 4 1 ['github-actions'] nobody
5-82514
5 days ago
12-74815
12 days ago
13-188
13 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 44 ['acmepjz', 'faenuccio', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mbkybky', 'yuanyi-350'] faenuccio
assignee:faenuccio
5-76392
5 days ago
5-76392
5 days ago
75-79796
75 days
26453 jburroni
author:jburroni
feat(Data/PNat/Basic): add order-related instances to PNat Add `SuccAddOrder ℕ+` and `NoMaxOrder ℕ+` instances. This allows, for example, the use of lemmas related to `Intervals` built with ℕ+. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-data new-contributor 18/0 Mathlib/Data/PNat/Basic.lean 1 3 ['eric-wieser', 'github-actions', 'jburroni'] nobody
5-53265
5 days ago
6-37123
6 days ago
6-37170
6 days
26023 Garmelon
author:Garmelon
chore: add githelper.py script As described in the readme file, this somewhat opinionated script aims to help fix weird git repo setups and restore them to a standardized state that closely matches what `gh repo clone` does. Like `migrate_to_fork.py`, this script requires the user to have `git` and `gh` installed. To use the script, run `scripts/githelper.py fix` in a git repo that is either a clone of mathlib or of a mathlib fork. The script will prompt you before making any changes, so the user retains control over the entire process. The script also prints the commands used. `fix` is a subcommand so other git and github management tasks can be added in the future. Possible examples: Deleting branches of closed PRs, keeping the fork in sync with upstream, removing branches from a fork that was accidentally cloned with all mathlib branches included. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 490/0 scripts/README.md,scripts/githelper.py 2 8 ['Garmelon', 'bryangingechen', 'github-actions', 'jcommelin'] bryangingechen
assignee:bryangingechen
5-13908
5 days ago
5-13908
5 days ago
7-23185
7 days
26462 PSchwahn
author:PSchwahn
feat(LinearAlgebra/Projection): add results about inverse of `Submodule.prodEquivOfIsCompl` Add two theorems `Submodule.prodEquivOfIsCompl_symm_apply` and `Submodule.prodEquivOfIsCompl_symm_add`, which are API for `Submodule.prodEquivOfIsCompl`. We believe these theorems are useful; for example, we have used their statements in a [classification formalization project](https://github.com/LieLean/LowDimSolvClassification). I am not sure whether the `prodEquivOfIsCompl_symm_apply` theorem should be tagged with `@[simp]`; this might lead to confluence issues. Opinions are welcome! Co-authored by: - [Viviana del Barco](https://github.com/vdelbarc) - [Gustavo Infanti](https://github.com/GuQOliveira) - [Exequiel Rivas](https://github.com/erivas) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
9/0 Mathlib/LinearAlgebra/Projection.lean 1 5 ['PSchwahn', 'github-actions', 'kckennylau'] nobody
4-20475
4 days ago
6-6109
6 days ago
6-6236
6 days
25862 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/) --- *This PR continues the work from #25174.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/25174* migrated-from-branch new-contributor t-euclidean-geometry 53/1 Mathlib/Geometry/Euclidean/Triangle.lean 1 8 ['eric-wieser', 'github-actions', 'jsm28', 'zcyemi'] nobody
4-14304
4 days ago
18-50775
18 days ago
18-54717
18 days
26295 DavidJWebb
author:DavidJWebb
feat: filtering lists and bounded quantifiers are primitive recursive A few useful lemmas not explicitly in Primrec.lean : - Filtering for elements from a list that meet a primrec criterion is primrec - Checking whether a list has some element meeting a primrec criterion is primrec - Checking whether every element of a list meets a primrec criterion is primrec - Primitive recursive functions are closed under bounded existential and universal quantifiers --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-computability new-contributor 210/0 Mathlib.lean,Mathlib/Computability/PrimrecFilter.lean 2 3 ['DavidJWebb', 'github-actions', 'grunweg'] nobody
2-68801
2 days ago
8-83363
8 days ago
8-85054
8 days
25951 themathqueen
author:themathqueen
feat(Analysis/InnerProductSpace/MulOpposite): defines the inner product on opposite spaces This pr defines the inner product on opposite spaces. - [ ] depends on #25949 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 117/0 Mathlib.lean,Mathlib/Analysis/InnerProductSpace/MulOpposite.lean,Mathlib/LinearAlgebra/Basis/MulOpposite.lean 3 1 ['github-actions'] nobody
2-35959
2 days ago
16-66182
16 days ago
16-66175
16 days
25910 themathqueen
author:themathqueen
feat(Algebra/Ring/Idempotent): for idempotent `p,q`, `q-p` is idempotent iff `pq=p=qp` Added useful lemmas for idempotents and projections. Main result: - IsIdempotentElem.sub_iff: if `p` and `q` are idempotent elements, then `q - p` is idempotent iff `p * q = p = q * p` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
89/0 Mathlib/Algebra/Ring/Idempotent.lean,Mathlib/LinearAlgebra/Projection.lean 2 23 ['github-actions', 'tb65536', 'themathqueen'] nobody
2-24112
2 days ago
2-84169
2 days ago
5-31932
5 days
26483 metakunt
author:metakunt
feat (RingTheory/RootsOfUnity/PrimitiveRoots) : Add equiv_primitiveRoots_of_coprimePow Adds equivalence of r-th primitive roots by a coprime e. new-contributor t-algebra
label:t-algebra$
79/0 Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean 1 6 ['Citronhat', 'github-actions', 'metakunt'] nobody
2-12348
2 days ago
5-28708
5 days ago
5-28754
5 days
26536 peterjunglas
author:peterjunglas
fix (Data/Matrix/Rank): extend applicability of rank_submatrix_le The current version of `rank_submatrix_le` is restricted to square matrices and doesn't allow for the reduction of lines. Both restrictions can be removed easily without changing the proof. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor 3/2 Mathlib/Data/Matrix/Rank.lean 1 1 ['github-actions', 'mbkybky'] nobody
1-77713
1 day ago
2-72562
2 days ago
2-72607
2 days
26300 igorkhavkine
author:igorkhavkine
feat(Analysis/Calculus/FDeriv): continuous differentiability from continuous partial derivatives on an open domain in a product space If a function `f : E × F → G` is continuously differentiable, then its partial derivatives along `E` and `F` are also continuous. The non-trivial converse implication holds when the partial derivatives are continuous on an open domain, and they can be added together to give the total derivative of `f`. See this [#mathlib4 > Partial derivatives @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Partial.20derivatives/near/520995477) and the containing thread for some discussion. The PR creates a new import (`Mathlib.Analysis.Calculus.FDeriv.Partial`), where other results about partial derivatives could go in the future. --- *this is the migration of #25304 to the PR-from-fork workflow* - [x] depends on: #25564 - [x] depends on: #26273 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-analysis 309/0 Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean 2 3 ['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot'] nobody
1-42912
1 day ago
6-74986
6 days ago
7-60725
7 days
26594 metakunt
author:metakunt
feat(Algebra/Polynomial/ZMod): Add Polynomial.equiv_of_nat_of_polynomial_zmod This adds an explicit bijection between the naturals and $$\mathbb{Z}/n\mathbb{Z}[X]$$ in a canonical way. --- I feel that some API is missing to make the theorem shorter, I have no idea what lemmas to extract though. Also I don't know when to use spaces and when not, so I did it best effort. new-contributor t-algebra
label:t-algebra$
465/0 Mathlib.lean,Mathlib/Algebra/Polynomial/ZMod.lean 2 1 ['github-actions'] nobody
1-38387
1 day ago
1-39417
1 day ago
1-39466
1 day
26597 sahanwijetunga
author:sahanwijetunga
Update Orthogonal.lean fixed documentation for orthogonal (regarding order of inputs to bilinear form) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
3/3 Mathlib/LinearAlgebra/BilinearForm/Orthogonal.lean 1 1 ['github-actions'] nobody
1-32398
1 day ago
1-32399
1 day ago
1-32450
1 day
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 7 ['Pazzaz', 'Ruben-VandeVelde', 'github-actions', 'grunweg', 'mariainesdff'] nobody
1-27231
1 day ago
75-46007
2 months ago
75-46060
75 days
26556 fweth
author:fweth
feat(CategoryTheory/Topos): subobject classifier without limits Adds an alternative API for constructing a subobject classifier without reference to limits. This PR modifies two files: - `Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean`: Adds strengthened versions of two existing theorems: - `of_horiz_isIso_mono` (alongside the existing `of_horiz_isIso`) - `of_vert_isIso_mono` (alongside the existing `of_vert_isIso`) - `Mathlib/CategoryTheory/Topos/Classifier.lean`: Addresses the TODO (removed from the file): > Make API for constructing a subobject classifier without reference to limits (replacing `⊤_ C` with an arbitrary `Ω₀ : C` and including the assumption `mono truth`) This implementation accepts a monomorphism `truth : Ω₀ ⟶ Ω` such that for every monomorphism `m : U ⟶ X` there exists a pair `χ₀ : U ⟶ Ω₀` and `χ : X ⟶ Ω` which creates a pullback square and `χ` must be unique in that it admits such a pair. Given these assumptions, we construct an instance of the existing `Classifier` structure, alongside with a proof that `Ω₀` is terminal. Klaus Gy --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-category-theory 88/8 Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean,Mathlib/CategoryTheory/Topos/Classifier.lean 2 1 ['github-actions'] nobody
0-65231
18 hours ago
0-65778
18 hours ago
2-30722
2 days
26272 ajirving
author:ajirving
feat(NumberTheory/LucasLehmer): prove converse direction to Lucas-Lehmer Proves the converse direction of the Lucas-Lehmer test, namely that the Lucas-Lehmer criterion is a necessary condition for a Mersenne prime. Adds a couple of examples of proving Mersenne numbers are composite using this. Proves that if `2^p-1` is prime then `p` is prime. --- * I wasn't sure how many examples to add given that there are many more Mersenne composites than primes. * There are a number of annoying coercions between different rings, any simplifications will be appreciated. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import new-contributor t-number-theory 226/5 Archive/Examples/MersennePrimes.lean,Mathlib/NumberTheory/LucasLehmer.lean 2 12 ['github-actions', 'kckennylau'] nobody
0-38173
10 hours ago
10-48558
10 days ago
10-48605
10 days
26638 metakunt
author:metakunt
chore: Add grind to cast_zero Add grind to cast_zero t-data new-contributor 1/1 Mathlib/Data/Nat/Cast/Defs.lean 1 1 ['github-actions'] nobody
0-34765
9 hours ago
0-34765
9 hours ago
0-36370
10 hours
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/) new-contributor t-algebra
label:t-algebra$
13/0 Mathlib/FieldTheory/RatFunc/Basic.lean 1 32 ['ShouxinZhang', 'eric-wieser', 'github-actions', 'joneugster', 'kckennylau', 'plp127'] nobody
0-15473
4 hours ago
2-28329
2 days ago
81-4869
81 days
26631 themathqueen
author:themathqueen
feat(Analysis/InnerProductSpace/Positive): a star projection operator is positive This shows that a star projection (i.e., a self-adjoint idempotent) operator is positive. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-analysis 17/0 Mathlib/Analysis/InnerProductSpace/Positive.lean 1 5 ['dupuisf', 'eric-wieser', 'github-actions'] nobody
0-6464
1 hour ago
0-48205
13 hours ago
0-48260
13 hours

PRs on the review queue labelled 'easy'

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
24931 qawbecrdtey
author:qawbecrdtey
feat(Data/Nat/Sqrt): Added lemma `Nat.add_one_sqrt_le_of_ne_zero` --- This commit proves a single lemma `Nat.add_one_sqrt_le_of_ne_zero`. ```lean lemma add_one_sqrt_le_of_ne_zero {n : ℕ} (hn : n ≠ 0) : (n + 1).sqrt ≤ n ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data easy 4/0 Mathlib/Data/Nat/Sqrt.lean 1 8 ['Ruben-VandeVelde', 'adomani', 'eric-wieser', 'github-actions', 'kckennylau', 'qawbecrdtey'] nobody
20-54174
20 days ago
48-69686
1 month ago
48-69743
48 days
26247 vasnesterov
author:vasnesterov
perf(Topology/Metrizable): lower `IsCompletelyMetrizableSpace.MetrizableSpace` priority This PR continues the work from #24967. Original PR: https://github.com/leanprover-community/mathlib4/pull/24967 t-topology easy 3/1 Mathlib/Topology/Metrizable/CompletelyMetrizable.lean 1 6 ['github-actions', 'mathlib-bors', 'vasnesterov'] nobody
10-50831
10 days ago
10-50832
10 days ago
11-71247
11 days
25915 BoltonBailey
author:BoltonBailey
chore(Algebra/Squarefree/Basic): fix erw This PR addresses an instance of the erw linter in Algebra/Squarefree/Basic. Original PR: https://github.com/leanprover-community/mathlib4/pull/25161 tech debt t-algebra easy
label:t-algebra$
1/1 Mathlib/Algebra/Squarefree/Basic.lean 1 1 ['github-actions'] nobody
6-8210
6 days ago
10-30132
10 days ago
17-48196
17 days
26426 Komyyy
author:Komyyy
doc: remove `PartENat.card` in the module doc [`PartENat.card`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Deprecated/Cardinal/Finite.html#PartENat.card) is moved to the `Deprecated` directory and it's not in this file([`Mathlib.SetTheory.Cardinal.Finite`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/SetTheory/Cardinal/Finite.html)) anymore. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-set-theory maintainer-merge easy documentation 0/2 Mathlib/SetTheory/Cardinal/Finite.lean 1 2 ['github-actions', 'grunweg'] nobody
5-70282
5 days ago
5-70282
5 days ago
5-70296
5 days
26486 DavidLedvinka
author:DavidLedvinka
feat(Order): Add curried versions of `biSup_prod` and `biInf_prod` Used in the Brownian Motion project. t-order easy 8/0 Mathlib/Order/CompleteLattice/Basic.lean 1 1 ['github-actions'] nobody
5-2582
5 days ago
5-2616
5 days ago
5-2629
5 days
26512 pechersky
author:pechersky
feat(RingTheory/Valuation/Integers): nontrivial_iff valuation subring is nontrivial iff ring is nontrivial stated using Integers to be more general --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra t-analysis t-number-theory easy
label:t-algebra$
13/0 Mathlib/RingTheory/Valuation/Integers.lean 1 1 ['github-actions'] nobody
3-51089
3 days ago
3-51132
3 days ago
3-51148
3 days
26204 Raph-DG
author:Raph-DG
feat(AlgebraicGeometry): Add global preorder instance for schemes In this PR we added a default preorder instance for schemes, defined to be the specialization order as discussed here: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/dimension.20function.20for.20schemes/near/524997376 for discussion --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebraic-geometry easy 15/0 Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/AlgebraicGeometry/Scheme.lean 2 3 ['Raph-DG', 'erdOne', 'github-actions'] nobody
2-76078
2 days ago
8-59882
8 days ago
11-78433
11 days
26550 Komyyy
author:Komyyy
chore: declare `T₀ ∧ R₀ → T₁` as an instance As [instT2SpaceOfR1SpaceOfT0Space](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Separation/Hausdorff.html#instT2SpaceOfR1SpaceOfT0Space). I forgot to do this in my PR(#26064). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology easy 1/2 Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/GDelta.lean 2 4 ['ADedecker', 'github-actions', 'leanprover-bot'] nobody
1-61469
1 day ago
2-44839
2 days ago
2-44825
2 days
26610 vihdzp
author:vihdzp
chore: fix minor docstring mistake LHS → RHS --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order easy 1/1 Mathlib/Order/IsNormal.lean 1 1 ['github-actions'] nobody
1-8221
1 day ago
1-8283
1 day ago
1-8277
1 day
26488 yuanyi-350
author:yuanyi-350
add some lemmas about `Nat.gcd` add some lemmas about `Nat.gcd` $lcm(\frac{k}{m}, \frac{k}{n}) = k / \gcd(m, n)$ --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra easy
label:t-algebra$
23/1 Mathlib/Data/Nat/GCD/Basic.lean 1 6 ['github-actions', 'vihdzp', 'wwylele'] nobody
1-971
1 day ago
4-64132
4 days ago
4-64333
4 days
26527 jsm28
author:jsm28
feat(LinearAlgebra/AffineSpace/Independent): `faceOpposite` point in 1-simplex Add a lemma about the point of `faceOpposite` applied to a 1-simplex. ```lean lemma faceOpposite_point_eq_point_rev (s : Simplex k P 1) (i : Fin 2) (n : Fin 1) : (s.faceOpposite i).points n = s.points i.rev := by ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra easy
label:t-algebra$
19/0 Mathlib/LinearAlgebra/AffineSpace/Independent.lean 1 14 ['eric-wieser', 'github-actions', 'jsm28'] nobody
0-52455
14 hours ago
3-23871
3 days ago
3-23856
3 days

PRs on the review queue labelled 'tech debt' or 'longest-pole'

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
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
24-11707
24 days ago
24-11729
24 days ago
30-5343
30 days
25776 Parcly-Taxel
author:Parcly-Taxel
chore: deprime `induction` in `Analysis` I think this is very marginally dependent on #25770. tech debt t-analysis 256/208 Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/BoxIntegral/Basic.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/InverseFunctionTheorem/ApproximatesLinearOn.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/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.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/Integrals.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/EulerSineProd.lean 35 2 ['Parcly-Taxel', 'github-actions'] nobody
20-68432
20 days ago
20-68865
20 days ago
20-68909
20 days
25790 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
20-67108
20 days ago
20-67207
20 days ago
20-67195
20 days
25774 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 133/124 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
20-55077
20 days ago
20-69314
20 days ago
20-69299
20 days
25770 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 134/115 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/SuccPred/Archimedean.lean,Mathlib/Order/Synonym.lean 15 10 ['Parcly-Taxel', 'eric-wieser', 'github-actions'] nobody
17-76293
17 days ago
20-71139
20 days ago
20-71124
20 days
25915 BoltonBailey
author:BoltonBailey
chore(Algebra/Squarefree/Basic): fix erw This PR addresses an instance of the erw linter in Algebra/Squarefree/Basic. Original PR: https://github.com/leanprover-community/mathlib4/pull/25161 tech debt t-algebra easy
label:t-algebra$
1/1 Mathlib/Algebra/Squarefree/Basic.lean 1 1 ['github-actions'] nobody
6-8210
6 days ago
10-30132
10 days ago
17-48196
17 days
26404 grunweg
author:grunweg
chore: clean up and remove FunProp/Differentiable - one lemma in that file already exists, hence can be removed (We don't add a deprecation as I presume people will not have used it.) - move the three remaining lemmas in that file to their proper place, and use the now `fun_` naming convention (Omitting deprecations again.) - after this, `FunProp/Differentiable` is empty and need not be imported any more: add a module deprecation --- - [x] depends on: #26355 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) tech debt 23/49 Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Tactic/FunProp/ContDiff.lean,Mathlib/Tactic/FunProp/Differentiable.lean,MathlibTest/fun_prop2.lean 4 3 ['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot'] nobody
2-19512
2 days ago
7-45278
7 days ago
7-45324
7 days
26648 eric-wieser
author:eric-wieser
chore(TensorProduct): remove more `suppress_compilation`s --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) tech debt t-algebra
label:t-algebra$
3/7 Mathlib/LinearAlgebra/CliffordAlgebra/Prod.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/External.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean 3 4 ['eric-wieser', 'github-actions', 'leanprover-bot'] nobody
0-8960
2 hours ago
0-10862
3 hours ago
0-11530
3 hours