The mathlib review queue

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This dashboard was last updated on: July 26, 2025 at 23:12 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
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
84-74210
2 months ago
95-85591
3 months ago
95-85573
95 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
83-70969
2 months ago
152-72611
5 months ago
152-72734
152 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
79-57907
2 months ago
144-22152
4 months ago
144-22139
144 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
79-37379
2 months ago
100-9823
3 months ago
110-58638
110 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
76-12543
2 months ago
76-18494
2 months ago
123-70713
123 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
75-68936
2 months ago
75-68936
2 months ago
99-6654
99 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
74-59051
2 months ago
74-67691
2 months ago
74-67743
74 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
74-14978
2 months ago
76-28300
2 months ago
76-33775
76 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
73-60433
2 months ago
73-60440
2 months ago
73-60582
73 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
73-40426
2 months ago
73-50261
2 months ago
73-50242
73 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
73-35324
2 months ago
73-35324
2 months ago
158-8358
158 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
72-22428
2 months ago
73-32259
2 months ago
73-49179
73 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
69-50004
2 months ago
85-49644
2 months ago
85-57557
85 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
68-20800
2 months ago
68-20924
2 months ago
68-24387
68 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
67-39203
2 months ago
67-43458
2 months ago
67-43440
67 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
65-79421
2 months ago
93-76978
3 months ago
93-77030
93 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
64-79228
2 months ago
64-79228
2 months ago
64-79280
64 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
64-36694
2 months ago
64-36761
2 months ago
81-21783
81 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
64-28034
2 months ago
66-74936
2 months ago
66-74992
66 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
61-21713
2 months ago
103-10011
3 months ago
103-10061
103 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
61-12168
2 months ago
66-74969
2 months ago
66-74965
66 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
60-7851
1 month ago
60-85663
1 month ago
60-85718
60 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
59-59441
1 month ago
63-25180
2 months ago
63-25162
63 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
59-54119
1 month ago
60-30061
1 month ago
66-34455
66 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
58-18230
1 month ago
58-18230
1 month ago
58-36613
58 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
55-38456
1 month ago
55-38534
1 month ago
55-38517
55 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
54-73293
1 month ago
55-83015
1 month ago
55-83004
55 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
51-79286
1 month ago
52-17220
1 month ago
53-27568
53 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
51-43874
1 month ago
52-11522
1 month ago
52-11574
52 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
48-54891
1 month ago
51-34438
1 month ago
51-34694
51 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
46-67145
1 month ago
46-67208
1 month ago
62-12744
62 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
44-51595
1 month ago
44-51668
1 month ago
44-51652
44 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
44-47168
1 month ago
44-56858
1 month ago
44-56845
44 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
44-45053
1 month ago
44-45118
1 month ago
44-45102
44 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
44-35629
1 month ago
44-42328
1 month ago
44-42312
44 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
44-34131
1 month ago
44-47084
1 month ago
44-47070
44 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
44-32426
1 month ago
44-69295
1 month ago
44-69278
44 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
43-85236
1 month ago
43-86200
1 month ago
43-86245
43 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
43-48740
1 month ago
43-49589
1 month ago
43-49576
43 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
43-29393
1 month ago
43-29393
1 month ago
43-34527
43 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
43-28742
1 month ago
45-84253
1 month ago
45-84235
45 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
40-26873
1 month ago
40-26883
1 month ago
40-26932
40 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
39-47953
1 month ago
39-47953
1 month ago
39-50479
39 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
39-16579
1 month ago
39-17551
1 month ago
39-17535
39 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
38-50085
1 month ago
38-50096
1 month ago
38-50143
38 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
38-49081
1 month ago
62-13642
2 months ago
62-17564
62 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
38-4752
1 month ago
42-36551
1 month ago
42-36596
42 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
37-38062
1 month ago
37-38062
1 month ago
37-38121
37 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
37-33664
1 month ago
37-33825
1 month ago
37-33878
37 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
37-32370
1 month ago
37-32806
1 month ago
37-32850
37 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
36-54132
1 month ago
37-35149
1 month ago
37-35198
37 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
36-49626
1 month ago
36-49632
1 month ago
36-49677
36 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
36-8284
1 month ago
37-65575
1 month ago
37-65558
37 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
36-2440
1 month ago
36-2440
1 month ago
36-7053
36 days
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
35-16070
1 month ago
35-16179
1 month ago
35-16242
35 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
35-13945
1 month ago
38-81609
1 month ago
38-81656
38 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
34-53813
1 month ago
35-15974
1 month ago
35-16017
35 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
34-31058
1 month ago
38-12394
1 month ago
38-12445
38 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
34-27338
1 month ago
43-49472
1 month ago
43-49457
43 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
33-67042
1 month ago
33-67065
1 month ago
33-80982
33 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
33-34432
1 month ago
33-34442
1 month ago
33-34487
33 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
33-27942
1 month ago
33-27942
1 month ago
36-85592
36 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
33-24902
1 month ago
33-24903
1 month ago
36-80904
36 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
33-19797
1 month ago
33-19866
1 month ago
33-19850
33 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
33-1336
1 month ago
38-39842
1 month ago
38-39887
38 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
32-72487
1 month ago
32-72494
1 month ago
32-72538
32 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
32-71936
1 month ago
32-71938
1 month ago
32-73230
32 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
31-46233
1 month ago
40-11753
1 month ago
40-11802
40 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
30-6297
1 month ago
30-6338
1 month ago
30-51098
30 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
29-32581
29 days ago
30-16439
1 month ago
30-16485
30 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
29-8295
29 days ago
29-8351
29 days ago
32-33326
32 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
28-79624
28 days ago
28-79624
28 days ago
31-2500
31 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
28-23052
28 days ago
33-66992
1 month ago
33-74743
33 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
27-86191
27 days ago
29-71825
29 days ago
29-71951
29 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
27-65100
27 days ago
28-34253
28 days ago
28-34301
28 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
27-62191
27 days ago
75-84274
2 months ago
141-84257
141 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
27-31857
27 days ago
27-31883
27 days ago
27-31929
27 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
26-36489
26 days ago
29-37252
29 days ago
34-34260
34 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
26-36185
26 days ago
35-55765
1 month ago
43-751
43 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
26-31666
26 days ago
32-35050
1 month ago
32-35102
32 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
26-31149
26 days ago
32-48775
1 month ago
32-48822
32 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
26-26024
26 days ago
34-5111
1 month ago
34-5160
34 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
26-5679
26 days ago
26-5920
26 days ago
26-35459
26 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
25-80866
25 days ago
40-45293
1 month ago
40-53895
40 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
25-75102
25 days ago
26-16697
26 days ago
26-19906
26 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
25-16772
25 days ago
25-16793
25 days ago
46-43433
46 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
25-12102
25 days ago
43-34643
1 month ago
43-34689
43 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
25-12071
25 days ago
43-34245
1 month ago
43-34230
43 days
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
24-85609
24 days ago
25-1234
25 days ago
44-51820
44 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
24-16632
24 days ago
40-3262
1 month ago
40-3309
40 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
24-14081
24 days ago
24-14081
24 days ago
24-15685
24 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
24-1107
24 days ago
24-1286
24 days ago
24-40709
24 days
23986 ShouxinZhang
author:ShouxinZhang
feat(FieldTheory/RatFunc): add RatFunc.toFractionRingAlgEquiv --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 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
23-81189
23 days ago
26-7645
26 days ago
104-70584
104 days
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
23-74707
23 days ago
30-46252
1 month ago
32-14791
32 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/) migrated-from-branch t-algebra
label:t-algebra$
11/0 Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Span.lean 2 1 ['github-actions'] nobody
23-58323
23 days ago
23-58323
23 days ago
37-43842
37 days
26645 erdOne
author:erdOne
feat(RingTheory/PowerSeries): Construction of `Q` such that `P(Q(X)) = X` Co-authored-by: Junnosuke Koizumi Co-authored-by: Hyeon, Seung-Hyeon Co-authored-by: Yuichiro Taguchi This contribution was created as part of the ZMC conference 2025 "Anabelian Geometry and its Computer Formalization". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
133/0 Mathlib/RingTheory/PowerSeries/Substitution.lean 1 9 ['chrisflav', 'erdOne', 'github-actions', 'kckennylau'] nobody
23-47564
23 days ago
23-83564
23 days ago
23-83611
23 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
23-33215
23 days ago
101-46598
3 months ago
157-7318
157 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
23-23419
23 days ago
33-24940
1 month ago
33-24992
33 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$
129/0 Mathlib.lean,Mathlib/LinearAlgebra/TensorPower/Symmetric.lean 2 6 ['AntoineChambert-Loir', 'erdOne', 'eric-wieser', 'github-actions', 'kckennylau'] nobody
23-22508
23 days ago
36-83573
1 month ago
36-83617
36 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$
122/100 Mathlib/Data/Matrix/Basis.lean,Mathlib/RingTheory/MatrixAlgebra.lean 2 13 ['Whysoserioushah', 'eric-wieser', 'github-actions'] nobody
23-8052
23 days ago
28-78940
28 days ago
45-48344
45 days
26670 yu-yama
author:yu-yama
feat(GroupExtension/Abelian): define `conjClassesEquivH1` This PR continues the work from #21837. Original PR: https://github.com/leanprover-community/mathlib4/pull/21837 t-algebra
label:t-algebra$
162/5 Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Abelian.lean,Mathlib/GroupTheory/GroupExtension/Basic.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,docs/references.bib 5 2 ['erdOne', 'github-actions', 'yu-yama'] nobody
22-85713
22 days ago
23-27818
23 days ago
23-27871
23 days
26710 metakunt
author:metakunt
feat (Data/Nat/Digits/Lemmas): Add digits_getD Adds digits_getD, an explicit computation of the i-th digits of n in base b representation. t-data new-contributor 64/0 Mathlib/Data/Nat/Digits/Lemmas.lean 1 1 ['github-actions'] nobody
22-83136
22 days ago
22-83267
22 days ago
22-83320
22 days
25812 vlad902
author:vlad902
feat(data): List.Chain' helper lemmas Add two helpers lemmas to go from a List.Chain' hypothesis to a concrete predicate about two consecutive elements, one in the positive and one in the negative. t-data 29/0 Mathlib/Data/List/Chain.lean 1 4 ['BoltonBailey', 'github-actions', 'vlad902'] nobody
22-64004
22 days ago
23-52298
23 days ago
36-54887
36 days
26267 vasnesterov
author:vasnesterov
feat(Analysis/Calculus): Taylor series converges to function on whole ball * Prove `FormalMultilinearSeries.AnalyticOnNhd`: the sum of series is analytic on its ball of convergence. * Prove `AnalyticOn.hasFPowerSeriesOnBall`: a variant of `AnalyticAt.hasFPowerSeriesAt` which gives convergence to the function on the ball of convergence. --- - [x] depends on: #23745 - [x] depends on: #23747 - [x] depends on: #23748 - [x] depends on: #26247 This PR continues the work from #23749. Original PR: https://github.com/leanprover-community/mathlib4/pull/23749 large-import t-analysis 47/0 Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean 2 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'vasnesterov'] nobody
22-62549
22 days ago
22-72045
22 days ago
22-78360
22 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 documentation
label:t-algebra$
3/3 Mathlib/LinearAlgebra/BilinearForm/Orthogonal.lean 1 2 ['github-actions', 'mbkybky'] nobody
22-59290
22 days ago
22-59297
22 days ago
25-11765
25 days
25179 YaelDillies
author:YaelDillies
feat: `#print sorries`, a command to find usage of `sorry` `#print sorries` returns all sorries in the current file. `#print sorries id1 ... idn` returns all sorries in declarations `id1`, ..., `idn`. 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 Co-authored-by: Kyle Miller --- 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 103/0 Mathlib.lean,Mathlib/Util/PrintSorries.lean 2 11 ['YaelDillies', 'eric-wieser', 'github-actions', 'kmill'] nobody
22-50296
22 days ago
62-53043
2 months ago
62-53095
62 days
26000 Hagb
author:Hagb
feat(RingTheory/MvPolynomial/MonomialOrder): some lemmas about degree Co-authored-by: Hao Shen @tsuki8 <3118181069@qq.com> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
24/0 Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean 1 6 ['Hagb', 'Ruben-VandeVelde', 'github-actions'] nobody
22-32896
22 days ago
22-33443
22 days ago
36-39624
36 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 10 ['erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
22-28192
22 days ago
47-53349
1 month ago
47-54288
47 days
26759 MichaelStollBayreuth
author:MichaelStollBayreuth
chore(Algebra/Polynomial/IsMonicOfDegree): do not import compute_degree tactic To prepare for an extension of the `monicity` tactic to also work for `IsMonicOfDegree`, avoid importing this and related tactics in the file that defines `IsMonicOfDegree`. This means that some proof that used `compute_degree` or `compute_degree!` need to be spelled out in terms of the API for `Polynomial.natDegree`. Zulip: [#mathlib4 > Gelfand-Mazur theorem @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Gelfand-Mazur.20theorem/near/526268507) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
15/8 Mathlib/Algebra/Polynomial/Degree/IsMonicOfDegree.lean 1 1 ['github-actions'] nobody
22-21570
22 days ago
22-21570
22 days ago
22-21554
22 days
26766 MichaelStollBayreuth
author:MichaelStollBayreuth
feat(Topology/MetricSpace/Bounded): add some results We add two pairs of results: ```lean lemma isBounded_of_abs_le (C : α) : Bornology.IsBounded {x : α | |x| ≤ C} := ... lemma isBounded_of_abs_lt (C : α) : Bornology.IsBounded {x : α | |x| < C} := ... ``` (under suitable assumptions on `α`) and a version of the *Extreme Value Theorem* that I found convenient: ```lean theorem exists_forall_le_of_isBounded {f : β → α} (hf : Continuous f) (x₀ : β) (h : Bornology.IsBounded {x : β | f x ≤ f x₀}) : ∃ x, ∀ y, f x ≤ f y := ... theorem exists_forall_ge_of_isBounded {f : β → α} (hf : Continuous f) (x₀ : β) (h : Bornology.IsBounded {x : β | f x₀ ≤ f x}) : ∃ x, ∀ y, f y ≤ f x := ... ``` (under suitable assumptions on `α` and `β`). For an application, see [GelfandMazur.lean](https://github.com/MichaelStollBayreuth/Heights/blob/master/Heights/GelfandMazur.lean) in [Heights](https://github.com/MichaelStollBayreuth/Heights/tree/master). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 56/0 Mathlib/Topology/MetricSpace/Bounded.lean 1 1 ['github-actions'] nobody
22-13543
22 days ago
22-13543
22 days ago
22-13527
22 days
25889 plp127
author:plp127
fix(Tactic/Widget/Conv): fix various issues Fixes various issues with the `conv?` widget. Closes #25162. ([Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/bug.20in.20.60conv.3F.60)) Specifically, fixes issues with `conv?` where - when converting a `SubExpr.Pos` to conv directions, it always uses the goal expression as reference, even when working on a hypothesis, this often leads to bad results and makes it unusable on hypotheses - it refuses to go all the way in to a function (for example in `Nat.succ 0`, you can't access `Nat.succ`) - it refuses to enter binders where the name of the bound variable contains the character `0` (try it on `∀ (x0 : Nat), x0 = x0`) - it panics if it can't find a binder name instead of just coming up with one itself, this also means usually you can't enter either side of a non-dependent arrow since those usually don't have binder names (try it on `False → False`) - you can't enter the type of a binder, you end up going into the body instead (try it on `fun (x : False) => (x.elim : False → Nat) x.elim`) - you can't partially enter a function, you end up going to the top argument after instead (for example, in the expression `id (id id) 0`, when you click on `id (id id)`, you end up going to `id id`) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 110/83 Mathlib/Tactic/Widget/Conv.lean 1 4 ['bryangingechen', 'github-actions', 'plp127'] nobody
21-69732
21 days ago
41-73516
1 month ago
41-73562
41 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$
257/194 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/Discriminant/Different.lean,Mathlib/NumberTheory/NumberField/Units/Regulator.lean,Mathlib/RingTheory/Ideal/Quotient/Index.lean 16 24 ['Ruben-VandeVelde', 'TwoFX', 'YaelDillies', 'alreadydone', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'loefflerd', 'madvorak', 'mathlib4-dependent-issues-bot', 'tb65536'] nobody
21-58785
21 days ago
21-61367
21 days ago
176-12298
176 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 2 ['github-actions', 'leanprover-community-bot-assistant'] nobody
21-58613
21 days ago
21-58631
21 days ago
44-47817
44 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 4 ['github-actions', 'leanprover-community-bot-assistant'] ericrbg
assignee:ericrbg
21-58148
21 days ago
21-58170
21 days ago
138-48789
138 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 2 ['b-mehta', 'github-actions', 'leanprover-community-bot-assistant'] nobody
21-57583
21 days ago
21-62863
21 days ago
38-22514
38 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 `Real.digits`, 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
21-55653
21 days ago
24-70421
24 days ago
24-70980
24 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 anything 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 2 ['github-actions', 'leanprover-community-bot-assistant'] nobody
21-55380
21 days ago
21-61856
21 days ago
37-39543
37 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 151/1 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
21-55372
21 days ago
38-12347
1 month ago
38-75203
38 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 3 ['github-actions', 'yuma-mizuno'] nobody
21-55072
21 days ago
21-55117
21 days ago
43-13486
43 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 68/51 Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,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/KrullDimension.lean,Mathlib/Order/WithBot.lean,Mathlib/Probability/Moments/Variance.lean,Mathlib/RingTheory/PowerBasis.lean,Mathlib/Topology/MetricSpace/Holder.lean,Mathlib/Topology/MetricSpace/HolderNorm.lean,MathlibTest/hint.lean 17 20 ['YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud'] nobody
21-51157
21 days ago
70-55472
2 months ago
120-48024
120 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. When constructing this structure, we found that making `AugmentedSimplexCategory` an abbrev rather than a `def` worked better. --- - [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. Happy to discuss the fact that I had to make `AugmentedSimplexCategory` an abbrev, I can revert this but this makes the proofs a bit harder (but, I guess, also less abusing some of defeqs?). [![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 523/111 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 4 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robin-carlier'] nobody
21-41555
21 days ago
21-56206
21 days ago
41-7679
41 days
25861 robin-carlier
author:robin-carlier
feat(CategoryTheory/Monoidal/Action): action of opposite categories Given a monoidal category `C` and a category `D`, we show that left (resp. right) `C`-actions on `D` induce left (resp. right) `Cᵒᵖ`-actions on `Dᵒᵖ`. Conversely, we show that left/right actions of `Cᵒᵖ` on `Dᵒᵖ` induce left/right actions of `C` on `D`. --- - [ ] depends on: #25860 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 272/0 Mathlib/CategoryTheory/Monoidal/Action/Opposites.lean 1 4 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
21-32503
21 days ago
21-32526
21 days ago
21-36804
21 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 4 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
21-32342
21 days ago
21-32360
21 days ago
33-83244
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 10 ['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant'] nobody
21-32222
21 days ago
21-59986
21 days ago
59-13160
59 days
26653 Hagb
author:Hagb
feat(RingTheory/Finiteness/Defs): span of a set is finitely generated iff generated by a finite subset --- This PR continues the work from #24651. Original PR: #24651. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 14/0 Mathlib/RingTheory/Finiteness/Defs.lean 1 1 ['github-actions'] nobody
21-25827
21 days ago
21-25852
21 days ago
23-58052
23 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$
217/157 Mathlib/Algebra/Algebra/Operations.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/NumberTheory/RamificationInertia/Basic.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 9 8 ['alreadydone', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
21-9434
21 days ago
21-12616
21 days ago
143-49420
143 days
26547 robin-carlier
author:robin-carlier
feat(CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform): more lemmas about isomorphisms of `CatCospanTransform` We construct ways to extract left, right or base components of ismorphisms of `CatCospanTransform`, as well as various `IsIso` instances, and lemmas allowing to compute the left, right or base component of the inverse of a `CatCospanTransformMorphism` that has an `IsIso` instance. --- - [x] depends on: #26412 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 70/0 Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean 1 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
20-56262
20 days ago
21-49431
21 days ago
21-52479
21 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 719/640 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 13 ['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
20-52353
20 days ago
20-52399
20 days ago
61-2749
61 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 15 ['eric-wieser', 'github-actions', 'madvorak'] nobody
20-50957
20 days ago
76-36146
2 months ago
77-72373
77 days
26746 alreadydone
author:alreadydone
feat(RingTheory): integral extensions of comm. rings are local homs migrated from #23684 --- 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 59/66 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/NumberTheory/RamificationInertia/Unramified.lean,Mathlib/RingTheory/Artinian/Ring.lean,Mathlib/RingTheory/Ideal/Int.lean,Mathlib/RingTheory/IntegralClosure/Algebra/Defs.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/LinearDisjoint.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/SimpleRing/Field.lean 15 7 ['alreadydone', 'github-actions', 'leanprover-bot', 'mariainesdff'] mariainesdff
assignee:mariainesdff
20-48424
20 days ago
20-48424
20 days ago
22-31989
22 days
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 5/0 Mathlib/SetTheory/Cardinal/Aleph.lean 1 5 ['github-actions', 'kckennylau', 'vihdzp'] nobody
20-31415
20 days ago
24-75971
24 days ago
24-76017
24 days
26770 Jun2M
author:Jun2M
feat(Combinatorics/Graph) : subgraph relations and operations on `Graph` This PR creates a new file `Combinatorics/Graph/Subgraph.lean`. In it, the PR introduces a partial order on graphs by subgraph relation, defines relations `IsInducedSubgraph`, `IsSpanningSubgraph` and `IsClosedSubgraph`. Further, it introduce operations `EdgeRestrict`, `EdgeDelete`, `induce` and `VertexDelete`. Co-authored-by: Peter Nelson --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 703/0 Mathlib.lean,Mathlib/Combinatorics/Graph/Subgraph.lean 2 1 ['github-actions'] nobody
20-16146
20 days ago
22-4960
22 days ago
22-5005
22 days
26829 pechersky
author:pechersky
feat(RingTheory/Valuation): Valuation.leAddSubgroup and ideal/submodule versions of ltAddSubgroup Extracted from #25450 without changing how Valued works --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) @faenuccio hopefully this bypasses any wait on #14752 because I am not changing Valued files. t-algebra
label:t-algebra$
177/0 Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Integers.lean 2 1 ['github-actions'] nobody
20-2255
20 days ago
20-7773
20 days ago
20-7829
20 days
26822 jsm28
author:jsm28
feat(LinearAlgebra/AffineSpace): affine combinations and spans of images Add two lemmas about affine combinations and the spans of points in a subset of an indexed family. ```lean /-- A point in the `affineSpan` of a subset of an indexed family is an `affineCombination` with sum of weights 1, using only points in the given subset. -/ lemma eq_affineCombination_of_mem_affineSpan_image {p₁ : P} {p : ι → P} {s : Set ι} (h : p₁ ∈ affineSpan k (p '' s)) : ∃ (fs : Finset ι) (w : ι → k), ↑fs ⊆ s ∧ ∑ i ∈ fs, w i = 1 ∧ p₁ = fs.affineCombination k p w := by ``` ```lean /-- If an affine combination of affinely independent points lies in the affine span of a subset of those points, all weights outside that subset are zero. -/ lemma AffineIndependent.eq_zero_of_affineCombination_mem_affineSpan {p : ι → P} (ha : AffineIndependent k p) {fs : Finset ι} {w : ι → k} (hw : ∑ i ∈ fs, w i = 1) {s : Set ι} (hm : fs.affineCombination k p w ∈ affineSpan k (p '' s)) {i : ι} (hifs : i ∈ fs) (his : i ∉ s) : w i = 0 := by ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
27/0 Mathlib/LinearAlgebra/AffineSpace/Combination.lean,Mathlib/LinearAlgebra/AffineSpace/Independent.lean 2 1 ['github-actions'] nobody
19-82333
19 days ago
20-19573
20 days ago
20-19557
20 days
26785 TOMILO87
author:TOMILO87
feat: beta distribution Add the Beta distribution to the probability distributions in mathlib4. This implementation includes: - Definition of the Beta function over the reals - The probability density function (PDF) of the Beta distribution - Proof that the PDF integrates to 1 - The corresponding `Measure` and CDF - Lemmas about measurability, positivity, and integrability The Beta distribution is a family of continuous probability distributions defined on the interval [0, 1], parametrized by two positive shape parameters, `α` and `β`, that control the shape of the distribution. This follows the general structure of other distributions in mathlib, such as the Gamma distribution. --- This is a clean version of the PR originally opened as [#25608](https://github.com/leanprover-community/mathlib4/pull/25608) and temporarily migrated in [#26325](https://github.com/leanprover-community/mathlib4/pull/26325). It includes: - `456da1c`: Initial version of the distribution - `c047aee`: Address review comments from @EtienneC30 - `f165c79`: Remove `ae` condition from `lintegral_betaPDF_eq` - `7875f47`: Lint fix for unused simp args This PR is rebased onto `master` and follows the fork-based workflow. Thanks for your helpful comments earlier! new-contributor t-measure-probability 285/0 Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Probability/Distributions/Beta.lean 3 1 ['github-actions'] nobody
19-55668
19 days ago
19-55668
19 days ago
21-32525
21 days
26841 xroblot
author:xroblot
feat(FieldTheory/IsGalois): map induced by the restriction to a subfield For `E/L` a field extension and `K` a subfield of `E`, we define the map `(E ≃ₐ[L] E) →* (K ≃ₐ[F] K)` induced by the restriction to `K` (with `F` a subfield of `K` and `L` such that `K/F` is normal) and study when it is injective and surjective. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
63/0 Mathlib/FieldTheory/Galois/Basic.lean 1 1 ['github-actions'] nobody
19-54548
19 days ago
19-54820
19 days ago
19-54868
19 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/Basic.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 3 ['Parcly-Taxel', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak'] nobody
19-44712
19 days ago
19-78684
19 days ago
42-58861
42 days
26765 KiringYJ
author:KiringYJ
feat(MeasureTheory/PiSystem): add π-λ theorem and SetLike instance Add two small features to `MeasureTheory/PiSystem`: 1. SetLike instance `instance : SetLike (DynkinSystem α) (Set α)` This lets us write `s ⊆ d` and `t ∈ d` for a DynkinSystem `d`, matching usual mathlib style. 2. `DynkinSystem.pi_lambda` lemma Classical π‑λ theorem: if a π‑system `s` is contained in a Dynkin system `d`, every set measurable for `σ(s)` is also in `d`. Currently, mathlib exposes this result only indirectly (e.g. via `generateFrom_eq`). Although logically equivalent, it is not obvious at first glance that those lemmas are the π‑λ theorem. The new lemma states the result in its familiar textbook form, so users can recognise and cite it immediately. Both pieces are under 10 lines, term‑mode only, and do not modify existing APIs. No breaking changes. No dependencies. new-contributor t-measure-probability easy 13/0 Mathlib/MeasureTheory/PiSystem.lean 1 10 ['KiringYJ', 'github-actions', 'ocfnash'] nobody
19-33666
19 days ago
19-56919
19 days ago
22-17375
22 days
26790 FlAmmmmING
author:FlAmmmmING
feat(Combinatorics/Enumerative/Bell.lean): define standard Bell number --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-combinatorics 38/1 Mathlib/Combinatorics/Enumerative/Bell.lean 1 11 ['AntoineChambert-Loir', 'FlAmmmmING', 'eric-wieser', 'github-actions', 'kckennylau', 'madvorak'] nobody
19-28633
19 days ago
21-25295
21 days ago
21-25342
21 days
26835 Vtec234
author:Vtec234
feat(Tactic): dependent rewriting ct'd Add dependent rewrite tactics `rw!` and `rewrite!`. These operate by inserting casts in front of terms that would otherwise become type-incorrect after the rewrite. In the default mode, only proof terms are casted, so that (by proof irrelevance) no observable complexity is added. In the most liberal mode, the tactics never encounter the 'motive is not type correct' error, but may add casts that make the goal or other term very complex. Co-authored-by: Aaron Liu --- Continued from #23930. This has been discussed on Zulip [here](https://leanprover.zulipchat.com/#narrow/channel/239415-metaprogramming-.2F-tactics/topic/dependent.20rewrite.20tactic/with/504228516). See the included test file for example rewrites that this tactic can do. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 764/0 Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/DepRewrite.lean,MathlibTest/depRewrite.lean 4 5 ['Vtec234', 'github-actions', 'kmill', 'plp127'] nobody
19-22168
19 days ago
19-63733
19 days ago
19-63785
19 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
19-20924
19 days ago
42-38273
1 month ago
42-41978
42 days
26158 upobir
author:upobir
feat(NumberTheory/Divisors): add int divisors This PR continues the work from #25209. Original PR: https://github.com/leanprover-community/mathlib4/pull/25209 t-number-theory 101/4 Mathlib/NumberTheory/Divisors.lean 1 34 ['MichaelStollBayreuth', 'github-actions', 'upobir'] nobody
19-12306
19 days ago
37-33158
1 month ago
37-33202
37 days
26693 euprunin
author:euprunin
chore: golf Computability/ using `grind` t-computability 5/24 Mathlib/Computability/Language.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PostTuringMachine.lean,Mathlib/Computability/Primrec.lean,Mathlib/Computability/RegularExpressions.lean 5 4 ['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] nobody
19-5644
19 days ago
19-5644
19 days ago
23-18189
23 days
26882 DavidLedvinka
author:DavidLedvinka
feat(Analysis): Additional `AsymptoticEquivalent` API Add four new theorems about asymptotic equivalence. These are used in the Brownian Motion project. large-import t-analysis 36/1 Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean 2 1 ['github-actions'] nobody
19-4374
19 days ago
19-10773
19 days ago
19-10826
19 days
26885 pechersky
author:pechersky
feat(Topology/ValuativeRel): ValuativeTopology 𝒪[K] and even when not a field, `ValuativeRel 𝒪[K]` This is an example of something achievable with the new declarations that wasn't possible with Valued Such that we can discuss the valuations on the subring without always using coercions But to achieve this, one needs some juggling of the value groups --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #26834 t-algebra t-topology t-number-theory
label:t-algebra$
82/10 Mathlib/RingTheory/Valuation/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean 2 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
18-35213
18 days ago
18-36145
18 days ago
0-331
5 minutes
26909 gasparattila
author:gasparattila
feat(LinearAlgebra/Projectivization/Subspace): correspondence between linear and projective subspaces --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
51/3 Mathlib/LinearAlgebra/Projectivization/Subspace.lean 1 1 ['github-actions'] nobody
18-11088
18 days ago
18-11094
18 days ago
18-11143
18 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 365/0 Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean 3 7 ['YaelDillies', 'agjftucker', 'github-actions', 'igorkhavkine', 'mathlib4-dependent-issues-bot'] nobody
18-2294
18 days ago
30-54302
1 month ago
31-40041
31 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 131/122 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/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 27 5 ['Parcly-Taxel', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak'] nobody
17-69958
17 days ago
17-69979
17 days ago
42-55393
42 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/) t-algebra
label:t-algebra$
324/2 Mathlib.lean,Mathlib/Data/Nat/Factorial/NatCast.lean,Mathlib/RingTheory/DividedPowers/RatAlgebra.lean 3 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
17-51883
17 days ago
17-54018
17 days ago
24-84716
24 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$
34/15 Mathlib/RingTheory/HahnSeries/HEval.lean 1 2 ['github-actions', 'leanprover-community-bot-assistant'] nobody
17-51003
17 days ago
19-17589
19 days ago
41-21259
41 days
26928 vihdzp
author:vihdzp
feat(Topology/Order/Basic): lower set in well-order is open As well as the other analogous theorems. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 37/0 Mathlib/Order/UpperLower/Basic.lean,Mathlib/Topology/Order/Basic.lean 2 1 ['github-actions'] nobody
17-44717
17 days ago
17-46857
17 days ago
17-47046
17 days
26934 mariainesdff
author:mariainesdff
feat(RingTheory/DedekindDomain/Ideal): add HeightOneSpectrum.ofPrime Previously #24036. Co-authored-by: @Louddy --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
9/0 Mathlib/RingTheory/DedekindDomain/Ideal.lean 1 2 ['github-actions', 'riccardobrasca'] riccardobrasca
assignee:riccardobrasca
17-32555
17 days ago
17-36121
17 days ago
17-36178
17 days
26936 mariainesdff
author:mariainesdff
feat(RingTheory/DividedPowes/SubDPIdeal): complete lattice and quotients We show that sub-dp-ideals of a divided power ideal `I` of a ring `A` form a complete lattice under inclusion. Given an ideal `J` of `A`, we construct the divided power structure on the ideal `I(A⧸J)` of the quotient, provided that `I ⊓ J` is a sub-dp-ideal of `I`. Co-authored-by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-algebra
label:t-algebra$
314/16 Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean 2 1 ['github-actions'] nobody
17-27318
17 days ago
17-31552
17 days ago
17-31604
17 days
26938 JovanGerb
author:JovanGerb
chore(gcongr): set `synthAssignedInstances := false` `synthAssignedInstances` is set to false in `congr` and `congr!` (when applying `@[congr]` lemmas). So it is natural to do the same in `gcongr` (when applying `@[gcongr]` lemmas). This should also marginally improve performance. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 2/1 Mathlib/Tactic/GCongr/Core.lean 1 4 ['JovanGerb', 'github-actions', 'leanprover-bot'] nobody
17-8504
17 days ago
17-11301
17 days ago
17-24781
17 days
26814 KiringYJ
author:KiringYJ
feat(MeasureTheory): expose `m.SigmaAlgebra` and `IsSigmaAlgebra` (New PR opened because I mis-clicked “Merge” on the previous branch and had to revert it.) This PR introduces a lightweight API for treating the σ‑algebra of a `MeasurableSpace` as a plain `Set (Set α)`, plus a semantic predicate `IsSigmaAlgebra` and small bridges between bundled and un‑bundled views. #### Motivation The immediate goal is to prepare for a formalization of the **monotone class theorem**. With `m.SigmaAlgebra` and the `IsSigmaAlgebra` predicate, one can state the theorem as a clean equality of families of sets, e.g. ```lean SigmaAlgebra.generateFrom G = MonotoneClass.generateFrom G ``` rather than the more cumbersome phrasing "`s` is measurable ↔ `s` belongs to the smallest monotone class containing `G`". The helpers in this PR make those equalities ergonomic and reusable. #### What’s new - **`m.SigmaAlgebra`** – the collection of all `m`‑measurable sets, exposed as a value of type `Set (Set α)`. Lets you write `s ∈ m.SigmaAlgebra` instead of `MeasurableSet[m] s`. - **`IsSigmaAlgebra F`** – predicate saying that a family of sets `A` is already a σ‑algebra, defined by `(generateFrom F).SigmaAlgebra = F`. - **`generateFrom_sigmaAlgebra_eq`** – idempotence lemma `generateFrom m.SigmaAlgebra = m` (`@[simp]`). - Boolean‑algebra instance on `m.SigmaAlgebra` (alias of the existing subtype instance). - Helper lemmas: - `Subtype.mem_sigma` – bundled measurable set ∈ `m.SigmaAlgebra`. - `Set.toMeasurableSubtype` – wrap a membership proof into the subtype. #### House‑keeping - Removed two obsolete `noncomputable` keywords from `Mathlib/MeasureTheory/MeasurablyGenerated.lean`; the affected instances are now computable. #### Notes - **No breaking changes**: the new definitions are additive; existing code continues to compile unchanged. - **No dependencies on other PRs**: this patch is self‑contained. new-contributor t-measure-probability 86/3 Mathlib.lean,Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean,Mathlib/MeasureTheory/MeasurableSpace/SigmaAlgebra.lean 3 1 ['github-actions'] nobody
16-62337
16 days ago
20-51306
20 days ago
20-51352
20 days
26956 mariainesdff
author:mariainesdff
feat(RingTheory/DividedPowers/Basic): add divided power structure on pZp We construct a divided power structure on the ideal `(p) ⊆ ℤ_[p]`, given by the family of maps `fun n x ↦ x^n / n!`. Co-authored-by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 561/2 Mathlib.lean,Mathlib/Data/Nat/Factorial/NatCast.lean,Mathlib/RingTheory/DividedPowers/Padic.lean,Mathlib/RingTheory/DividedPowers/RatAlgebra.lean 4 1 ['github-actions'] nobody
16-48346
16 days ago
16-48353
16 days ago
16-50696
16 days
26941 pechersky
author:pechersky
chore(GroupWithZero/WithZero): use `recZeroCoe` for `WithZero.lift'` gives better simps apply lemmas --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order t-algebra
label:t-algebra$
2/4 Mathlib/Algebra/GroupWithZero/WithZero.lean 1 3 ['github-actions', 'kbuzzard', 'pechersky'] nobody
16-26763
16 days ago
17-19993
17 days ago
17-20060
17 days
26881 emo916math
author:emo916math
feat(Analysis/Calculus/Deriv/Star) A formula for `deriv (conj ∘ f ∘ conj)` Added a lemma that `deriv (conj ∘ f ∘ conj) = conj ∘ deriv f ∘ conj`, proved by cases on whether the derivative mathematically exists or not. This PR replaces [#26805](https://github.com/leanprover-community/mathlib4/pull/26805); see discussion there. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-analysis 50/2 Mathlib/Analysis/Calculus/Deriv/Star.lean 1 7 ['emo916math', 'github-actions', 'kckennylau'] nobody
16-14218
16 days ago
19-11256
19 days ago
19-11301
19 days
26022 AntoineChambert-Loir
author:AntoineChambert-Loir
feat(RingTheory/MvPolynomial/Groebner): add docstring and a particular case * add a new division theorem when one divides by a single polynomial * add docstrings to the three division theorems This PR continues the work from #24819. Original PR: https://github.com/leanprover-community/mathlib4/pull/24819 t-algebra
label:t-algebra$
27/3 Mathlib/RingTheory/MvPolynomial/Groebner.lean 1 2 ['AntoineChambert-Loir', 'github-actions'] nobody
16-586
16 days ago
39-40653
1 month ago
39-40703
39 days
26368 Whysoserioushah
author:Whysoserioushah
feat(RingTheory/TwoSidedIdeal/SpanAsSum): span of set as finsum Reopened after everything moved to fork (#23320). --- [![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 5 ['github-actions', 'kckennylau'] nobody
15-75790
15 days ago
32-15509
1 month ago
32-15556
32 days
26945 gasparattila
author:gasparattila
feat(LinearAlgebra/AffineSpace/AffineSubspace): basic properties of `sInf` and `iInf` These properties are analogous to the existing ones for the binary infimum. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
48/1 Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean 1 4 ['Ruben-VandeVelde', 'gasparattila', 'github-actions'] nobody
15-52038
15 days ago
17-17054
17 days ago
17-17101
17 days
26986 WangYiran01
author:WangYiran01
feat(Partition): add bijection for partitions with max part ≤ r ## Summary This PR adds a new theorem `partition_max_equals_bound` to `Mathlib.Combinatorics.Enumerative.Partition`. It constructs a bijection between: - The set of partitions of `n` in which `r ∈ π.parts` and all parts are `≤ r`, and - The set of partitions of `n - r` whose largest part is at most `r`. This provides a constructive proof via removing/adding `r` from/to the partition multiset, in line with classical enumerative combinatorics. ## Implementation notes - The proof uses `Multiset.erase` and `Multiset.cons` with basic properties of `sum`, `sup`, and `Partition` structures. - The bijection is implemented explicitly via `f` and `g`, and proven mutually inverse via `Subtype.ext`. ## Linting - [x] Passes `lake build` - [x] Linter clean (no commandStart or longLine issues) ## Author Contributed by Yiran Wang. new-contributor t-combinatorics 85/0 Mathlib/Combinatorics/Enumerative/Partition.lean 1 2 ['WangYiran01', 'github-actions'] nobody
15-48490
15 days ago
15-49855
15 days ago
15-49900
15 days
26988 YaelDillies
author:YaelDillies
feat(Rel): more API Some of this API already exists in `Topology.UniformSpace.Defs` but not spelled with `Rel`, some of it was written for #24173. --- `Topology.UniformSpace.Defs` will be refactored to use these new lemmas in #23181. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 169/7 Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Data/Rel.lean 2 1 ['github-actions'] nobody
15-41827
15 days ago
15-45652
15 days ago
15-45704
15 days
26827 pechersky
author:pechersky
feat(Analysis/Normed/ValuativeRel): helper instance for NormedField --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #26713 - [x] depends on: #26826 t-algebra t-analysis t-number-theory
label:t-algebra$
238/25 Mathlib.lean,Mathlib/Analysis/Normed/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean 3 11 ['ADedecker', 'adamtopaz', 'github-actions', 'mathlib4-dependent-issues-bot', 'pechersky'] nobody
15-38790
15 days ago
19-15616
19 days ago
19-15881
19 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$
309/0 Mathlib.lean,Mathlib/RingTheory/Bialgebra/GroupLike.lean,Mathlib/RingTheory/Coalgebra/GroupLike.lean,Mathlib/RingTheory/HopfAlgebra/GroupLike.lean 4 33 ['Julian-Kuelshammer', 'Parcly-Taxel', 'YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot', 'smorel394'] nobody
15-38481
15 days ago
77-4213
2 months ago
77-5767
77 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 2 ['github-actions', 'leanprover-community-bot-assistant'] nobody
15-37768
15 days ago
15-37790
15 days ago
34-63130
34 days
27000 gasparattila
author:gasparattila
feat(Analysis/Normed/Group/Quotient): isometric versions of isomorphisms This PR adds an isometric version of the third isomorphism theorem for groups and modules. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import new-contributor t-analysis 49/2 Mathlib/Analysis/Normed/Group/Quotient.lean 1 1 ['github-actions'] nobody
15-32618
15 days ago
15-32620
15 days ago
15-32673
15 days
27008 oliver-butterley
author:oliver-butterley
feat(Dynamics): add `comp_iterate_integrable` If an observable is integrable then the observable formed by composing with iterates of a measure preserving map is also integrable. Co-authored-by: Lua Viana Reis me@lua.blog.br --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-dynamics 34/0 Mathlib.lean,Mathlib/Dynamics/MeasurePreserving/Lemmas.lean 2 1 ['github-actions'] nobody
15-20838
15 days ago
15-20847
15 days ago
15-20895
15 days
26101 xroblot
author:xroblot
feat(NumberField): specialized version of Kummer Dedekind for the splitting of prime numbers We prove a specialized version of [KummerDedekind.normalizedFactorsMapEquivNormalizedFactorsMinPolyMk](https://leanprover-community.github.io/mathlib4_docs/Mathlib/NumberTheory/KummerDedekind.html#KummerDedekind.normalizedFactorsMapEquivNormalizedFactorsMinPolyMk) for the splitting of rational prime numbers in number fields. This PR continues the work from #25038. --- - [ ] depends on: #26137 t-number-theory 172/2 Mathlib/NumberTheory/NumberField/Ideal/KummerDedekind.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/Ideal/Over.lean 5 4 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'xroblot'] nobody
15-2696
15 days ago
15-2713
15 days ago
0-50
50 seconds
25970 wwylele
author:wwylele
feat(RingTheory): decompose archimedean classes of HahnSeries In preparation for #25140, this connects archimedean class and HahnSeries --- - [x] depends on: #26773 - [x] depends on: #26787 - [x] depends on: #26788 - [x] depends on: #26789 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import 367/2 Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/RingTheory/HahnSeries/Lex.lean 2 6 ['ScottCarnahan', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'wwylele'] nobody
14-78624
14 days ago
14-80157
14 days ago
33-26351
33 days
27019 Komyyy
author:Komyyy
feat: T1 Alexandrov-discrete topology is discrete --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 24/0 Mathlib.lean,Mathlib/Topology/Separation/AlexandrovDiscrete.lean 2 1 ['github-actions'] nobody
14-64674
14 days ago
14-64976
14 days ago
14-64961
14 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
14-58453
14 days ago
34-27874
1 month ago
34-27921
34 days
26838 vlad902
author:vlad902
feat: add lemmas about `List.scanr` This PR continues the work from #25188. Original PR: https://github.com/leanprover-community/mathlib4/pull/25188 t-data 84/19 Mathlib/Data/List/Scan.lean 1 12 ['github-actions', 'vihdzp', 'vlad902'] nobody
14-54518
14 days ago
19-57027
19 days ago
19-57082
19 days
24015 alreadydone
author:alreadydone
feat(RingTheory): lemmas on finiteness of `LinearMap` and `Module.End` --- One less lemma than #24012, but with the advantage of not depending on #23963. - [x] depends on: #24115 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
137/81 Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/LinearAlgebra/BilinearMap.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/SimpleModule/Basic.lean 7 19 ['alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'mathlib4-dependent-issues-bot'] erdOne
assignee:erdOne
14-53837
14 days ago
59-83744
1 month ago
102-31087
102 days
27030 YaelDillies
author:YaelDillies
refactor: use `Algebra.FiniteType` as a class Assumptions are currently being passed explicitly, which is quite odd. Also generalise the ~lemmas~ instances about `Polynomial`, `MvPolynomial`, etc... to be about two rings instead of one. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-algebra
label:t-algebra$
53/46 Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Extension/Cotangent/Basic.lean,Mathlib/RingTheory/FiniteType.lean 3 1 ['github-actions'] nobody
14-31014
14 days ago
14-32637
14 days ago
14-32633
14 days
27042 Ruben-VandeVelde
author:Ruben-VandeVelde
feat: some WithZero lemmas Co-authored-by: matthewjasper <20113453+matthewjasper@users.noreply.github.com> Co-authored-by: Salvatore Mercuri --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) FLT t-algebra
label:t-algebra$
54/1 Mathlib/Algebra/Order/GroupWithZero/Canonical.lean 1 1 ['github-actions'] nobody
14-13195
14 days ago
14-13204
14 days ago
14-13250
14 days
25786 Parcly-Taxel
author:Parcly-Taxel
feat: IMO 2001 Q4 IMO 138/4 Archive.lean,Archive/Imo/Imo2001Q4.lean,Mathlib/Logic/Equiv/Fin/Rotate.lean 3 6 ['Parcly-Taxel', 'dwrensha', 'github-actions', 'leanprover-community-bot-assistant'] nobody
13-65151
13 days ago
19-79418
19 days ago
42-58591
42 days
27047 YaelDillies
author:YaelDillies
feat: `MonoidHom.toAdditive''` as a `MulEquiv` From Toric --- I haven't yet been very thorough with the new lemmas. I first want to hear thoughts about the names [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-algebra
label:t-algebra$
31/7 Mathlib/Algebra/Group/TypeTags/Hom.lean 1 1 ['github-actions'] nobody
13-60093
13 days ago
13-60110
13 days ago
14-5568
14 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 7 ['erdOne', 'github-actions', 'matthewjasper', 'riccardobrasca'] nobody
13-38925
13 days ago
84-41540
2 months ago
86-9837
86 days
26580 vasnesterov
author:vasnesterov
feat(Tactic/Order): translate linear orders to `Int` It was [pointed out](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/tactic.20for.20partial.20orders/near/515897754) that `order` is not complete for linear orders with lattice operations (while it remains complete for linear orders without lattice operations and for general lattices without assuming linearity). The problem for linear orders with lattice operations is NP-hard, but it can be translated from an arbitrary type to `Int` and then solved using a smart and efficient procedure (such as `omega`). This PR implements such a translation within the `order` tactic. Co-authored-by: Aaron Liu --- - [x] depends on: #26354 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-meta 302/22 Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Order.lean,Mathlib/Tactic/Order/Graph/Basic.lean,Mathlib/Tactic/Order/Preprocessing.lean,Mathlib/Tactic/Order/ToInt.lean,MathlibTest/order.lean 7 4 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'vasnesterov'] nobody
13-36258
13 days ago
13-48166
13 days ago
13-49867
13 days
26899 robin-carlier
author:robin-carlier
feat(CategoryTheory/Functor/KanExtension): transitivity of left Kan extensions In this PR, we show that left Kan extensions are "transitive" in the following sense : if `α : F₀ ⟶ L ⋙ F₁` exhibits `F₁` as a left Kan extension of `F₀` along `L : C ⥤ D`, then given a functor `L' : D ⥤ D'` an an extension `(β : F₁ ⟶ L' ⋙ F₂)`, the "pasted extension" formed by `α` and `β` exhibits `F₂` as a left Kan extension of `F₀` along `L ⋙ L'` if and only if `β` exhibits `F₂` as a left Kan extension of `F₁` along `L'`. This refines the current theorems in mathlib that only treat the case where we pre or post-compose by an equivalence. The actual statement we prove is "fully weak" and lets us pick a functor isomorphic to `L ⋙ L'` and an extension isomorphic to the pasted one if needed. --- I will PR the dual version of everything for right Kan extensions as soon as we settle on the final form of this one. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 144/0 Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean 1 8 ['github-actions', 'joelriou', 'robin-carlier'] nobody
13-34169
13 days ago
13-34169
13 days ago
16-5400
16 days
27049 BoltonBailey
author:BoltonBailey
doc(Analysis/BoxIntegral/Partition/Filter): field docstrings Split of #25917. Adds docstrings to the fields of this structure (Taken from the docstring of the structure itself). Note: this documentation was originally changed by asking Cursor (Claude 3.5 sonnet) to write the docstrings, but I think ultimately the docstring of the struct was reworked. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 13/14 Mathlib/Analysis/BoxIntegral/Partition/Filter.lean 1 2 ['BoltonBailey', 'github-actions'] nobody
12-86072
12 days ago
14-2164
14 days ago
14-2385
14 days
26968 vihdzp
author:vihdzp
feat(Order/Concept): sets in a concept are codisjoint ...and other small lemmata. --- - [x] depends on: #26976 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order 33/2 Mathlib/Order/Concept.lean 1 8 ['github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace', 'mathlib4-dependent-issues-bot', 'plp127', 'vihdzp'] nobody
12-83780
12 days ago
12-83796
12 days ago
13-26949
13 days
27073 pechersky
author:pechersky
feat(Archive/Examples/Local): files showcasing properties of local fields for p-adics, completions of number fields, laurent series, and fraction rings of witt vectors Should get filled in as more data/instances are declared --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 139/0 Archive.lean,Archive/Examples/Local/Laurent.lean,Archive/Examples/Local/NumberField.lean,Archive/Examples/Local/Padic.lean,Archive/Examples/Local/Witt.lean 5 1 ['github-actions'] nobody
12-76939
12 days ago
13-31109
13 days ago
13-31092
13 days
27110 pechersky
author:pechersky
chore(Valued/WithVal): apply_symm_equiv valuation on the WIthVal is equal to the underlying valuation and simp tag --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra t-topology t-number-theory easy
label:t-algebra$
4/0 Mathlib/Topology/Algebra/Valued/WithVal.lean 1 1 ['github-actions'] nobody
12-68524
12 days ago
12-68527
12 days ago
12-68582
12 days
27109 pechersky
author:pechersky
feat(RingTheory/AdicValuation): valuation_surjective for both the base valuation and the one on the extension --- [![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$
31/0 Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean 2 1 ['github-actions'] nobody
12-68514
12 days ago
12-68514
12 days ago
12-68596
12 days
25814 vlad902
author:vlad902
feat(SimpleGraph): Weaker condition for paths in acyclic graphs `IsAcyclic.isPath_iff_chain'` defines a weaker condition for proving that a walk is a path, in particular it shows that rather than proving that all vertices in the support of a walk are distinct, one must only show that consecutive edges are distinct (e.g. every other vertex must be distinct.) This leads to a simple corollary that trails are also paths in acyclic graphs. I had a need for this when formalizing Cayley graphs, since this condition maps cleanly onto words in free groups being reduced. --- *This PR continues the work from #25630.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/25630* t-combinatorics 43/0 Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean 2 2 ['github-actions', 'vlad902'] nobody
12-62152
12 days ago
44-32080
1 month ago
44-32064
44 days
27120 YaelDillies
author:YaelDillies
feat: the category of commutative bialgebras Define the bundled category `CommBialgCat R` of commutative bialgebras over a fixed commutative ring `R` along with the forgetful functor to `CommAlgCat`. From Toric Co-authored-by: Andrew Yang Co-authored-by: Michał Mrugała --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-algebra
label:t-algebra$
235/0 Mathlib.lean,Mathlib/Algebra/Category/CommBialgCat.lean 2 1 ['github-actions'] nobody
12-58988
12 days ago
12-58988
12 days ago
12-59059
12 days
27126 YaelDillies
author:YaelDillies
chore(CategoryTheory/Monoidal): unify `mkIso` Previously, `mkIso` and `mkIso'` meant different things across the various types of objects. Now: * `mkIso'` takes in elements `X`, `Y` of the underlying category `C`, an isomorphism `e : X ≅ Y` and a typeclass assumption `[IsMon_Hom e.hom]` and returns `mk X ≅ mk Y`, * `mkIso` is an `abbrev` for `mkIso'`, taking in elements `X`, `Y` of `Obj C`, an isomorphism `e : X.X ≅ Y.X` and the proof fields of `IsMon_Hom e.hom` and returns `X ≅ Y`. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-category-theory 66/66 Mathlib/CategoryTheory/Monoidal/Bimon_.lean,Mathlib/CategoryTheory/Monoidal/CommGrp_.lean,Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean 5 1 ['github-actions'] nobody
12-43846
12 days ago
12-44391
12 days ago
12-44385
12 days
26955 mariainesdff
author:mariainesdff
feat(LinearAlgebra/OnSup): extend linear maps to sums of modules Let `A` be a ring, `X, Y` be `A`-modules, and `M, N` be `A`-submodules of `X`. Given two linear maps `f : M →ₗ[A] Y` and `g : N →ₗ[A] Y` that agree on `M ∩ N`, there is a unique linear map `M + N →ₗ[A] Y` that simultaneously extends `f` and `g`. Co-authored-by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
153/0 Mathlib.lean,Mathlib/LinearAlgebra/OnSup.lean 2 15 ['AntoineChambert-Loir', 'eric-wieser', 'github-actions', 'wwylele'] nobody
12-42535
12 days ago
12-42602
12 days ago
13-7110
13 days
26961 mariainesdff
author:mariainesdff
feat(RingTheory/PowerSeries/Substitution): add API Co-authored-by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
62/1 Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean 2 5 ['Ruben-VandeVelde', 'github-actions', 'mariainesdff'] nobody
12-39413
12 days ago
16-45035
16 days ago
16-45086
16 days
27059 Komyyy
author:Komyyy
feat: Linear upper or lower sets topologies are completely normal The primary motivation for this theorem is to prove that Sierpiński space is completely normal. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 77/1 Mathlib.lean,Mathlib/Topology/Order/UpperLowerSetTopology.lean,Mathlib/Topology/Separation/LinearUpperLowerSetTopology.lean 3 1 ['github-actions'] nobody
12-35404
12 days ago
13-59829
13 days ago
13-59813
13 days
27003 eric-wieser
author:eric-wieser
chore: use `Simp.ResultQ` more often Also uses `~q` in place of manual `isDefEq` matching. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 18/22 Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/NormNum/Result.lean,Mathlib/Tactic/ReduceModChar.lean 3 2 ['eric-wieser', 'github-actions'] nobody
12-29712
12 days ago
15-27939
15 days ago
15-27923
15 days
27108 pechersky
author:pechersky
chore(RingTheory/AdicValuation): golf using WithZero.log with helper lemma of how `log` preserves order --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra t-number-theory
label:t-algebra$
15/16 Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean 2 2 ['YaelDillies', 'github-actions'] nobody
12-29128
12 days ago
12-29128
12 days ago
12-38920
12 days
27136 plp127
author:plp127
chore: mark argument explicit in `LinearOrder.toBiheytingAlgebra` Mark `α : Type*` explicit in `LinearOrder.toBiheytingAlgebra`. This matches better with what other similar reducible non-instances have. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order 17/14 Mathlib/Data/Fintype/Order.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Order/CompleteLatticeIntervals.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/Order/Heyting/Basic.lean 6 1 ['github-actions'] nobody
12-27745
12 days ago
12-27886
12 days ago
12-27882
12 days
27137 YaelDillies
author:YaelDillies
feat(CategoryTheory/Monoidal: an isomorphism of group objects is an isomorphim of the underlying objects From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-category-theory 12/0 Mathlib/CategoryTheory/Monoidal/CommGrp_.lean,Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean 4 1 ['github-actions'] nobody
12-27155
12 days ago
12-27208
12 days ago
12-27208
12 days
27113 pechersky
author:pechersky
feat(RingTheory/SimpleRing/Principal): a commutative simple ring is a PID via `IsField` and new `IsField.isDomain` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
41/2 Mathlib.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/SimpleRing/Principal.lean 4 4 ['alreadydone', 'github-actions'] nobody
12-25470
12 days ago
12-66874
12 days ago
12-66869
12 days
26282 AntoineChambert-Loir
author:AntoineChambert-Loir
feat: a theorem of Jordan on primitive subgroups of the permutation group A theorem of Jordan on the primitive subgroups of a permutation group: * if it contains a swap, it is equal to the permutation group, * if it contains a 3-cycle, it contains the alternating group. This PR continues the work from #24131. - [x] depends on: #26281 - [x] depends on: #26280 - [x] depends on: #26279 Original PR: https://github.com/leanprover-community/mathlib4/pull/24131 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import 1084/183 Mathlib.lean,Mathlib/Data/Set/Card.lean,Mathlib/GroupTheory/GroupAction/Jordan.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/Primitive.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/SetTheory/Cardinal/Embedding.lean 10 n/a ['AntoineChambert-Loir', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'tb65536'] nobody
12-24535
12 days ago
unknown
unknown
27118 Timeroot
author:Timeroot
feat(Matrix/Charpoly/Eigs): Roots of Matrix.charpoly are the eigenvalues. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-algebra
label:t-algebra$
58/0 Mathlib/LinearAlgebra/Matrix/Charpoly/Eigs.lean,scripts/noshake.json 2 1 ['github-actions'] nobody
12-21928
12 days ago
12-61429
12 days ago
12-61473
12 days
25910 themathqueen
author:themathqueen
feat(Algebra/Ring/Idempotent): subtraction lemmas for idempotents and star projections This allows us to use subtraction with idempotents and star projections. For idempotents `p,q`, `q - p` is idempotent when `p * q = p = q * p`. For star projections `p,q`, `q - p` is a star projection when either `p * q = p` or `q * p = p`. In a star-ordered ring, when `p * q = p` or `q * p = p` we get `p ≤ q`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
70/0 Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Ring/Idempotent.lean,Mathlib/Algebra/Star/StarProjection.lean 3 23 ['github-actions', 'tb65536', 'themathqueen'] nobody
12-15733
12 days ago
26-63485
26 days ago
29-11247
29 days
27090 TerenceGitH
author:TerenceGitH
feat(Topology, Archive/Examples): Kuratowski's closure-complement theorem (incl. sharpness) This is the outcome of a course project at Heidelberg University: https://matematiflo.github.io/CompAssistedMath2025/ feat(Topology): Kuratowski's closure-complement theorem "Topology/Kuratowski.lean" proves Kuratowski's closure-complement theorem, which says that if one repeatedly applies the closure and complement operators to a set in a topological space, at most 14 distinct sets can be obtained. feat(Archive/Examples): sharpness of Kuratowski's closure-complement theorem: "Examples/Kuratowski.lean" gives an example of a so-called "14-set" in ℝ, from which exactly 14 distinct sets can be obtained. Co-authored-by: Luis Sand @luiis-sd Co-authored-by: Leon Müller @leondieprobifi Co-authored-by: Junyan Xu @alreadydone --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-topology 386/0 Archive.lean,Archive/Examples/Kuratowski.lean,Mathlib.lean,Mathlib/Topology/Kuratowski.lean 4 5 ['alreadydone', 'github-actions', 'wwylele'] nobody
12-8136
12 days ago
13-11659
13 days ago
13-13002
13 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 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] PatrickMassot
assignee:PatrickMassot
11-45943
11 days ago
21-12334
21 days ago
128-78264
128 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 28 ['YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'kbuzzard', 'kmill', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot'] kmill
assignee:kmill
11-25619
11 days ago
11-25643
11 days ago
173-13601
173 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 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
11-25137
11 days ago
11-45335
11 days ago
67-28603
67 days
27035 faenuccio
author:faenuccio
chore(IsManifold/Basic): replace continuity by aesop --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-differential-geometry easy 5/5 Mathlib/Geometry/Manifold/IsManifold/Basic.lean 1 3 ['faenuccio', 'fpvandoorn', 'github-actions'] nobody
11-24826
11 days ago
14-24275
14 days ago
14-27163
14 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`. Co-authored-by: Aaron Liu --- - [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$
758/237 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/Irrational.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/norm_num_ext.lean,MathlibTest/ring.lean,scripts/nolints.json 20 8 ['eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'plp127'] nobody
11-17198
11 days ago
13-22982
13 days ago
23-22368
23 days
27149 euprunin
author:euprunin
feat: slightly reduce the verbosity of `lake cache exe get` Along with reducing distracting verbosity, this change also addresses the confusing, seemingly contradictory output pair: ``` Downloaded: 6951 file(s) [attempted 6951/6951 = 100%] (100% success) No files to download ``` Pre: ``` % lake exe cache get Current branch: master Using cache from origin: github-username/mathlib4 Attempting to download 6951 file(s) from leanprover-community/mathlib4 cache Downloaded: 6951 file(s) [attempted 6951/6951 = 100%] (100% success) No files to download Decompressing 6951 file(s) Unpacked in 546 ms Completed successfully! % lake exe cache get Current branch: master Using cache from origin: github-username/mathlib4 No files to download No files to download Decompressing 6951 file(s) Unpacked in 320 ms Completed successfully! % ``` Post: ``` % lake exe cache get Current branch: master Using cache from origin: github-username/mathlib4 Attempting to download 6951 file(s) from leanprover-community/mathlib4 cache Downloaded: 6951 file(s) [attempted 6951/6951 = 100%] (100% success) Decompressing 6951 file(s) % lake exe cache get Current branch: master Using cache from origin: github-username/mathlib4 Decompressing 6951 file(s) % ``` Fixes #27038. Note that the download progress output is kept unchanged. 0/4 Cache/IO.lean,Cache/Requests.lean 2 2 ['euprunin', 'github-actions'] nobody
11-8667
11 days ago
11-61141
11 days ago
11-61124
11 days
27072 eric-wieser
author:eric-wieser
feat(Data/Matrix): more lemmas about `Matrix.vecMulVec` Inspired by [#new members > Is this a reasonable formalization? @ 💬](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Is.20this.20a.20reasonable.20formalization.3F/near/528412531). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 66/0 Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Mul.lean 2 1 ['github-actions'] nobody
10-85192
10 days ago
13-33333
13 days ago
13-33375
13 days
27159 Parcly-Taxel
author:Parcly-Taxel
feat: IMO 1997 Q3 IMO 129/0 Archive.lean,Archive/Imo/Imo1997Q3.lean 2 5 ['Parcly-Taxel', 'eric-wieser', 'github-actions'] nobody
10-74959
10 days ago
11-35654
11 days ago
11-35643
11 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 11 ['Parcly-Taxel', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant'] nobody
10-74855
10 days ago
19-78918
19 days ago
42-61307
42 days
27200 rotarc75
author:rotarc75
feat(RingTheory/Ideal): oka predicates over ideals This PR introduces the notion of Oka predicates over the ideals of a ring. We usually speak of [Oka families](https://stacks.math.columbia.edu/tag/05K9) but predicates seemed more in line with mathlib's conventions. Currently this notions isn't used anywhere but we plan to make an other PR that proves that is all prime ideals of a ring are finitely generated, then this ring is Noetherian. We can also use Oka predicates to simplify the existing proof of [`IsPrincipalIdealRing.of_prime`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/PrincipalIdealDomainOfPrime.html#IsPrincipalIdealRing.of_prime). Co-authored-by: Anthony Fernandes --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
53/0 Mathlib.lean,Mathlib/RingTheory/Ideal/Oka.lean 2 1 ['github-actions'] nobody
10-44431
10 days ago
10-44431
10 days ago
10-45331
10 days
27207 pechersky
author:pechersky
feat(Topology/WithVal): ValuativeRel (WithVal v) with a helper valuation defined that does not pierce defeq --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra t-topology
label:t-algebra$
23/0 Mathlib/Topology/Algebra/Valued/WithVal.lean 1 1 ['github-actions'] nobody
10-34353
10 days ago
10-34354
10 days ago
10-34669
10 days
27210 YaelDillies
author:YaelDillies
feat: `MonoidHom.toHomUnits` is a monoid hom From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric large-import t-algebra
label:t-algebra$
21/4 Mathlib/Algebra/Group/Units/Hom.lean 1 1 ['github-actions'] nobody
10-32940
10 days ago
10-33291
10 days ago
10-33435
10 days
27182 eric-wieser
author:eric-wieser
feat: add bundled versions of `Equiv.cast` These are essentially the non-categorical versions of `eqToHom`. These are helpful to state some functorial results about things like `DFinsupp.equivCongrLeft` (with the alternative being to use an evil triangle somewhere instead). [#Is there code for X? > LinearEquiv.cast / AddEquiv.cast etc @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/LinearEquiv.2Ecast.20.2F.20AddEquiv.2Ecast.20etc/near/521390380) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
31/0 Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Ring/Equiv.lean 4 3 ['github-actions', 'pechersky', 'plp127'] nobody
10-23119
10 days ago
11-1682
11 days ago
11-1725
11 days
26914 quangvdao
author:quangvdao
feat(Data/PFunctor/Univariate): more definitions for univariate `PFunctor` This PR defines several basic definitions of `PFunctor`, including zero, one, constants, monomials, coproduct (sum), product, sigma, pi, tensor product, universe lifting, and equivalence. We also add: (1) simple lemmas connecting the basic definitions, (2) an automatically derived ext lemma for `PFunctor` via `@[ext]` attribute Some things I'm not clear on: - I define `HAdd` and `HMul` instances for coproduct and product of poly functors having different universe levels. Should I also define `Add` and `Mul` instances for poly functors having the same universe level? - Is it ok to define notation for tensor product, i.e. `@[inherit_doc] scoped infixr:80 " ⊗ " => tensor`? I'm worried it might clash with other notation. - Need a double-check on the priority of notation. Some future definitions to add: - Various equivalences arising from arithmetic identities, e.g., `P + 0 ≃ₚ P`. - Definitions of Lenses and Charts (each of them will be a file or even a folder) - Exponential objects (corresponding to both `prod` and `tensor`) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 183/5 Mathlib/Data/PFunctor/Univariate/Basic.lean 1 10 ['alexkeizer', 'eric-wieser', 'github-actions', 'quangvdao'] nobody
10-6278
10 days ago
17-80960
17 days ago
17-81006
17 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 3 ['github-actions', 'pimotte', 'xcloudyunx'] nobody
9-79460
9 days ago
60-1494
1 month ago
60-1547
60 days
27226 xcloudyunx
author:xcloudyunx
feat(Combinatorics/SimpleGraph): Add Subgraph.inclusion_edge_apply_coe and inclusion_edgeSet_apply_coe This PR continues the work from #25248. Original PR: https://github.com/leanprover-community/mathlib4/pull/25248 new-contributor t-combinatorics 14/0 Mathlib/Combinatorics/SimpleGraph/Subgraph.lean 1 1 ['github-actions'] nobody
9-77969
9 days ago
9-79388
9 days ago
9-79445
9 days
27014 yuanyi-350
author:yuanyi-350
feat(GroupTheory/Perm/Fin): add Fin.cycleIcc and refactor cycleRange In this PR, I define the 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 the fact that 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) ``` --- Migrated from #24139 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
216/26 Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Embedding.lean,Mathlib/Data/Fin/SuccPred.lean,Mathlib/GroupTheory/Perm/Fin.lean 5 55 ['faenuccio', 'github-actions', 'mbkybky', 'yuanyi-350'] faenuccio
assignee:faenuccio
9-66604
9 days ago
11-38685
11 days ago
14-31437
14 days
27184 JovanGerb
author:JovanGerb
chore(Order/Filter/Basic): write lemmas in point-free style This PR writes the congruence lemmas about filtered equality and about asymptotic equivalence in a point-free style. This is so that they can then be tagged with `@[gcongr]`. Some of the old versions have been kept with a `fun_` name. And apparently the import size has decreased as a bonus :) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order 43/28 Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Indicator.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Map.lean,Mathlib/Probability/Density.lean 8 4 ['JovanGerb', 'eric-wieser', 'github-actions'] nobody
9-45024
9 days ago
11-736
11 days ago
11-781
11 days
26870 grunweg
author:grunweg
feat: mdifferentiableOn_section_of_mem_baseSet₀ From the path towards geodesics and the Levi-Civita connection. Co-authored-by: Patrick Massot --- - [x] depends on: #26866 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-differential-geometry 125/0 Mathlib/Geometry/Manifold/VectorBundle/MDifferentiable.lean 1 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
9-35110
9 days ago
9-35272
9 days ago
9-35434
9 days
27066 vasnesterov
author:vasnesterov
feat(Tactic/Order): frontend for `order` * Support `order [h1, h2]` and `order only [h1, h2]` syntax. * Split conjunctions while extracting facts from the context. E.g. hypotheses in the form `A ∧ B` are converted into two facts `A` and `B`. * Similarly, extract facts from existential quantifiers in the hypotheses. --- - [x] depends on: #26354 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This PR continues the work from #22073. Original PR: https://github.com/leanprover-community/mathlib4/pull/22073 t-meta 92/29 Mathlib.lean,Mathlib/Tactic/Linarith/Frontend.lean,Mathlib/Tactic/Order.lean,Mathlib/Tactic/Order/CollectFacts.lean,Mathlib/Util/ElabWithoutMVars.lean,MathlibTest/order.lean 6 22 ['JovanGerb', 'github-actions', 'mathlib4-dependent-issues-bot', 'vasnesterov'] nobody
9-31699
9 days ago
13-49459
13 days ago
13-49488
13 days
27024 grunweg
author:grunweg
feat: Gram-Schmidt orthonormalisation for sections of a vector bundle Add a parametrised version of Gram-Schmidt, for sections of a topological vector bundle with a bundle metric. This will be used to define orthonormal local frames. From the path towards geodesics and the Levi-Civita connection. Co-authored-by: Patrick Massot --- - [x] depends on: #27023 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-differential-geometry 294/11 Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Geometry/Manifold/VectorBundle/GramSchmidtOrtho.lean,scripts/noshake.json 4 59 ['faenuccio', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
9-30920
9 days ago
10-620
10 days ago
10-8171
10 days
27021 grunweg
author:grunweg
feat: custom elaborators for differential geometry Add two sets of custom elaborators for differential geometry, to - infer the model with corners in `MDifferentiable{WithinAt,At,On}` or `ContMDiff{WithinAt,At,On}` expressions from the local context, and provide shorter notation in that setting - do the same for mfderiv: `mfderiv% f` is shorthand for `mfderiv I J f`; `mfderiv[s] f x` is short for `mfderivWithin I J f s` - convert a fibre bundle section from a dependent section to a function into the total space, making working with differentiability of sections of fibre bundles less cumbersome This was [discussed on zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Differential.20geometry.20elaborators.20experiment/with/528035295), to overall broad consensus. This code has substantial tests and has been tried in the branch in #26221 (uncovering minor issues, but not substantial ones). The implementation itself is of prototype quality and will be cleaned up in the future. Once it is more robust, more differential geometry files can be converted to use it. Co-authored-by: Patrick Massot ----------- I agree that merging not fully polished code is not ideal, but propose doing so for two reasons: - the work in #26221 used these elaborators extensively (to test them). Reverting those changes, merging the code, only to re-apply them is not a good use of time. Merging this PR now enables merging the work in #26221 soon. - the feature is clearly useful and not going away: in the files that use it, it works well already. Holding off on further adopting, but merging it now seems like a good compromise. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-differential-geometry t-meta 782/0 Mathlib.lean,Mathlib/Geometry/Manifold/Elaborators.lean,Mathlib/Geometry/Manifold/Traces.lean,MathlibTest/DifferentialGeometry/Elaborators.lean,scripts/noshake.json 5 4 ['github-actions', 'grunweg', 'sgouezel'] nobody
9-30219
9 days ago
14-53148
14 days ago
14-53222
14 days
27006 zhikaip
author:zhikaip
refactor: crossProduct notation Replace `×₃` with `⨯` (`\X` or `\crossproduct`), and manually deprecate the old syntax. See [#mathlib4 > Notation for crossProduct](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Notation.20for.20crossProduct/with/520119542) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor t-meta 37/22 Mathlib/Geometry/Euclidean/Angle/Unoriented/CrossProduct.lean,Mathlib/LinearAlgebra/CrossProduct.lean 2 10 ['eric-wieser', 'github-actions', 'j-loreaux', 'kmill'] nobody
9-27350
9 days ago
15-12786
15 days ago
15-22812
15 days
27179 euprunin
author:euprunin
chore: golf `sub_convs_eq` using `field_simp` and `grind` t-algebra
label:t-algebra$
2/10 Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean 1 4 ['euprunin', 'github-actions', 'grunweg'] nobody
9-13151
9 days ago
11-8076
11 days ago
11-8121
11 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
9-11270
9 days ago
32-56302
1 month ago
32-56285
32 days
22782 alreadydone
author:alreadydone
feat(Topology): étalé space associated to a predicate on sections --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 886/160 Mathlib.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Geometry/Manifold/Sheaf/Smooth.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Topology/EtaleSpace.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/Sheaves/LocalPredicate.lean,Mathlib/Topology/Sheaves/Sheafify.lean,Mathlib/Topology/Sheaves/Stalks.lean 10 12 ['AntoineChambert-Loir', 'alreadydone', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant'] nobody
8-83463
8 days ago
20-852
20 days ago
20-1570
20 days
26667 mariainesdff
author:mariainesdff
feat(FieldTheory/SplittingField/IsSplittingField): add IsScalarTower.splits, IsScalarTower.isAlgebraic Co-authored-by: @faenuccio --- - [ ] depends on: #26666 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
29/0 Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/FieldTheory/SplittingField/IsSplittingField.lean 2 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'tb65536'] nobody
8-80337
8 days ago
11-32805
11 days ago
11-33413
11 days
27244 xroblot
author:xroblot
feat(RingTheory/DedekindDomain): lifting an ideal in an extension is injective This PR develops some API for [FractionalIdeal.extended](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/FractionalIdeal/Extended.html#FractionalIdeal.extended) and in particular for when it is an injective map (for an algebra map). As a consequence, it deduces the fact that lifting an integral ideal in an extension of Dedekind domains is an injective map. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-algebra
label:t-algebra$
190/5 Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/Localization/Basic.lean 3 1 ['github-actions'] nobody
8-69509
8 days ago
8-70761
8 days ago
8-70805
8 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 9 ['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'jsm28', 'leanprover-community-bot-assistant'] nobody
8-58833
8 days ago
45-13378
1 month ago
105-85501
105 days
26811 loefflerd
author:loefflerd
feat(LinearAlgebra/Projectivization): GL(V) action Some API around projective spaces and general linear groups: - an equiv between V and W gives an equiv between GL(V) and GL(W) - GL(V) acts on the projectivization of V - GL 2 K acts on `OnePoint K` (which is the projectivization of `K x K`) I am adding these because I need them to define cusps in modular form theory, but they are hopefully something of general usefulness beyond that. --- - [x] depends on: #27104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-algebra
label:t-algebra$
146/3 Mathlib.lean,Mathlib/LinearAlgebra/GeneralLinearGroup.lean,Mathlib/LinearAlgebra/Projectivization/GLAction.lean,Mathlib/Topology/Compactification/OnePoint/ProjectiveLine.lean 4 26 ['bjoernkjoshanssen', 'eric-wieser', 'github-actions', 'loefflerd', 'mathlib4-dependent-issues-bot'] nobody
8-56539
8 days ago
11-50663
11 days ago
20-557
20 days
26403 riccardobrasca
author:riccardobrasca
feat: add `isPrincipalIdealRing_of_isPrincipal_of_lt_or_isPrincipal_of_mem_primesOver_of_mem_Icc` This PR continues the work from #25186. Original PR: https://github.com/leanprover-community/mathlib4/pull/25186 t-number-theory 48/12 Mathlib/NumberTheory/NumberField/ClassNumber.lean 1 3 ['github-actions', 'riccardobrasca', 'xroblot'] nobody
8-49889
8 days ago
31-32178
1 month ago
31-32212
31 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/) t-dynamics 44/0 Mathlib.lean,Mathlib/Dynamics/BirkhoffSum/QuasiMeasurePreserving.lean 2 10 ['github-actions', 'oliver-butterley', 'sgouezel'] nobody
8-49366
8 days ago
8-49384
8 days ago
38-52235
38 days
26853 oliver-butterley
author:oliver-butterley
feat(Mathlib/MeasureTheory/MeasurableSpace/Invariants): add `comp_eq_of_measurable_invariants` Invariance of `g` follows from `Measurable[invariants f] g`. Co-authored-by: Lua Viana Reis --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-measure-probability easy 6/0 Mathlib/MeasureTheory/MeasurableSpace/Invariants.lean 1 2 ['Ruben-VandeVelde', 'github-actions'] nobody
8-48626
8 days ago
8-48626
8 days ago
19-1072
19 days
27180 ADedecker
author:ADedecker
feat: quotient of a monoid with zero by a multiplicative congruence --- My motivation is getting a more conceptual construction of [ValuativeRel.ValueGroupWithZero](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Valuation/ValuativeRel.html#ValuativeRel.ValueGroupWithZero), but I think this is of independent interest. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
141/26 Mathlib.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/GroupWithZero.lean 5 22 ['ADedecker', 'eric-wieser', 'github-actions'] nobody
8-35134
8 days ago
10-51920
10 days ago
10-62365
10 days
27245 rirarika
author:rirarika
MvPolynomial.Irreducible --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
88/0 Mathlib.lean,Mathlib/Algebra/MvPolynomial/Irreducible.lean 2 3 ['alreadydone', 'github-actions', 'mbkybky'] nobody
8-28247
8 days ago
8-54736
8 days ago
8-54780
8 days
26975 Whysoserioushah
author:Whysoserioushah
feat: a norm_num extension for complex numbers co-authored-by : @thefundamentaltheor3m, @hrmacbeth --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 337/0 Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/NormNum/NormNumI.lean,MathlibTest/norm_numI.lean 4 35 ['Whysoserioushah', 'eric-wieser', 'github-actions', 'hrmacbeth'] nobody
8-14137
8 days ago
9-17615
9 days ago
9-21933
9 days
27248 kckennylau
author:kckennylau
chore: remove `suppress_compilation` from Mathlib.Algebra.Category.Ring.Constructions --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra easy
label:t-algebra$
2/4 Mathlib/Algebra/Category/Ring/Constructions.lean 1 4 ['github-actions', 'grunweg', 'leanprover-bot'] nobody
8-10100
8 days ago
8-41984
8 days ago
8-42033
8 days
27261 Sebi-Kumar
author:Sebi-Kumar
feat(Topology): add definition for subpaths Define subpaths as restrictions of paths to subintervals, reparameterized to have domain `[0, 1]` and possibly with a reverse of direction. Prove their basic properties. This serves as an alternative to `Path.truncate` which is useful for the explicit construction of certain homotopies, in particular regarding the concatenation of subpaths. --- To provide additional context, this is my first time contributing to Mathlib, and I am doing so as a part of the Fields Undergraduate Summer Research Program hosted at Western University. My intention for this file is for it to be used when proving that the fundamental group of the sphere is trivial (following the proof from Hatcher's "Algebraic Topology"). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-topology 148/0 Mathlib.lean,Mathlib/Topology/Subpath.lean 2 1 ['github-actions'] nobody
8-7270
8 days ago
8-17901
8 days ago
8-17949
8 days
27264 pechersky
author:pechersky
feat(Topology/ValuedField): range of valuation on competion is the same as base field and other helper API to prepare for ValuativeTopology --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 60/0 Mathlib/Topology/Algebra/Valued/ValuedField.lean 1 1 ['github-actions'] nobody
8-6119
8 days ago
8-6129
8 days ago
8-6174
8 days
27265 pechersky
author:pechersky
feat(Topology/Valued): discrete topology on a valued field when trivial valuation or when there is a nonzero term in the valuation codomain that is smaller than all nonzero valuations --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 33/0 Mathlib/Topology/Algebra/Valued/ValuationTopology.lean 1 1 ['github-actions'] nobody
8-6115
8 days ago
8-6119
8 days ago
8-6163
8 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 13 ['Ruben-VandeVelde', 'github-actions', 'loefflerd', 'sgouezel'] nobody
8-4550
8 days ago
8-4683
8 days ago
43-38842
43 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 471/0 Mathlib.lean,Mathlib/Geometry/Diffeology/Basic.lean,docs/references.bib 3 9 ['JovanGerb', 'github-actions', 'lecopivo', 'peabrainiac'] nobody
7-75419
7 days ago
28-72737
28 days ago
28-77490
28 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 124/25 Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Data/Finsupp/Option.lean 2 13 ['BoltonBailey', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
7-72884
7 days ago
7-72904
7 days ago
29-79888
29 days
27105 xroblot
author:xroblot
feat(Ring/DedekindDomain): formula for the splitting of prime ideals in an extension This PR just puts together all the results that were already there to deduce: ```lean map (algebraMap S R) p = ∏ P ∈ p.primesOver R, P ^ p.ramificationIdx (algebraMap S R) P ``` for `p` a maximal ideal of a ring `S` and `R` an extension of `S` that is a Dedekind ring. Note. There is a significant import increase in the file `RingTheory.DedekindDomain.Factorization`. However, this file is almost a leaf file so this increase only affects a limited number of files. If the increase is too big, a new file, say `RingTheory.DedekindDomain.PrimeSplitting`, can be added instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-algebra
label:t-algebra$
89/3 Mathlib/RingTheory/DedekindDomain/Factorization.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Over.lean 4 1 ['github-actions'] nobody
7-70459
7 days ago
12-78816
12 days ago
12-78861
12 days
26793 FlAmmmmING
author:FlAmmmmING
feat(Algebra/Group /ForwardDiff.lean): add five theorems for forward difference --- [![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$
212/3 Mathlib/Algebra/Group/ForwardDiff.lean 1 35 ['AntoineChambert-Loir', 'DAE123456', 'FlAmmmmING', 'Ruben-VandeVelde', 'github-actions', 'kckennylau', 'madvorak'] nobody
7-58251
7 days ago
8-71205
8 days ago
21-23693
21 days
27284 FernandoChu
author:FernandoChu
Chore(CategoryTheory/MorphismProperty/MonoFactorization): Factor out mono factorizations Factored out `MonoFactorisations` from the `Images` file; also rename it to `MonoFactori*z*ations` so it's inline with the rest of Mathlib. I'm also sneaking in some very basic extremal epis results if you don't mind, these were meant to be used to prove ```lean instance (priority := 100) hasStrongEpiImages_of_hasPullbacks_of_hasEqualizers [HasPullbacks C] [HasEqualizers C] : HasStrongEpiImages C ``` Which I noticed too late already had a proof; I think the proof has been improved anyways, it's just `infer_instance` now. new-contributor t-category-theory 419/259 Mathlib.lean,Mathlib/Algebra/Category/Grp/Images.lean,Mathlib/Algebra/Category/ModuleCat/Images.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/CategoryTheory/Abelian/Basic.lean,Mathlib/CategoryTheory/Category/Factorisation.lean,Mathlib/CategoryTheory/ConcreteCategory/EpiMono.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Images.lean,Mathlib/CategoryTheory/Limits/Shapes/ExtremalEpi.lean,Mathlib/CategoryTheory/Limits/Shapes/Images.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Shapes/StrongEpi.lean,Mathlib/CategoryTheory/Limits/Shapes/ZeroMorphisms.lean,Mathlib/CategoryTheory/Limits/Types/Images.lean,Mathlib/CategoryTheory/MorphismProperty/MonoFactorization.lean,Mathlib/CategoryTheory/Sites/Subsheaf.lean,Mathlib/Order/Category/NonemptyFinLinOrd.lean,scripts/nolints_prime_decls.txt 18 1 ['github-actions'] nobody
7-51454
7 days ago
7-54012
7 days ago
7-54063
7 days
25500 eric-wieser
author:eric-wieser
feat: delaborators for metadata Being able to see these is very important when debugging tactic failures. Probably these could be upstreamed, but I don't think that's a reason not to merge them here first. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-meta 75/3 Mathlib/Util/Delaborators.lean,Mathlib/Util/PPOptions.lean,MathlibTest/delaborators.lean 3 11 ['JovanGerb', 'Rob23oba', 'eric-wieser', 'github-actions'] nobody
7-39512
7 days ago
51-8053
1 month ago
51-8112
51 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
7-35127
7 days ago
32-14513
1 month ago
32-14561
32 days
26646 eric-wieser
author:eric-wieser
feat(TensorProduct): add a Repr Now that tensor products are computable again, this makes them `#eval`able. --- [![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 6 ['JovanGerb', 'eric-wieser', 'github-actions'] nobody
7-23401
7 days ago
23-77896
23 days ago
23-77949
23 days
27098 Paul-Lez
author:Paul-Lez
feat(Algebra/Category/ModuleCat/Sheaf/VectorBundle): define vector bundles This PR defines vector bundles (upstreamed from [formal-conjectures](https://github.com/google-deepmind/formal-conjectures/pull/28/files)). I plan on adding some more API about the definition in this PR, but figured it would be nice to get some initial feedback about the definition before doing so! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
53/0 Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/VectorBundle.lean 2 2 ['Kiolt', 'github-actions'] nobody
7-17968
7 days ago
13-7646
13 days ago
13-7693
13 days
26880 agjftucker
author:agjftucker
feat(Calculus/FDeriv/Partial): `hasStrictFDerivAt_uncurry_coprod` concerning partial derivatives Confident that other contributions will follow (e.g. #26300), I begin this file with only the result needed to apply the implicit function theorem to a curried function. --- - [x] depends on: #26742 [This dependency is very slight.] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 126/0 Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean 2 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
7-11129
7 days ago
7-11129
7 days ago
11-2310
11 days
27242 hugh-fox
author:hugh-fox
feat: add Gauss-like formula for sums of digit sums Adds `sum_digit_sum_base_pow_eq` to show a Gauss-like formula across sums of digit sums. This relies on an additional two simp lemmas, named `digits_sum_eq_self`, `digits_sum_base_mul_cancel`. Lastly, includes a specialization (which is a good bit simpler than the general formula) to base 10 named `sum_digit_sum_ten_pow_eq`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-data new-contributor 113/0 Mathlib/Data/Nat/Digits/Lemmas.lean 1 5 ['github-actions', 'hugh-fox', 'kckennylau'] nobody
7-10032
7 days ago
8-73810
8 days ago
8-73857
8 days
26907 JovanGerb
author:JovanGerb
feat(gcongr): also use more general lemmas, closing extra goals with rfl This PR fixes an annoyance in tagging `gcongr` lemmas: if your function has `n` arguments in which to use congruence, then you would need to provide `2^n-1` `gcongr` lemmas. Now, it suffices to only tag the most general `gcongr` lemma, and in more specific cases, the extra goals will be closed using `rfl`. While working on this, more issues with `gcongr` came up, and these all needed to be dealt with in the same PR: - When applying a `gcongr` lemma, this should be done in the `reducible` transparency. The transparency was already bumped form `default` to `instances` after a zulip discussion ([#mathlib4 > gcongr unfold DFunLike.coe](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/gcongr.20unfold.20DFunLike.2Ecoe/with/482186693)). But I found that the same issue appears at `instances` transparency instead of `reducible`. MWE: ``` import Mathlib open MeasureTheory variable {α : Type*} (a : Set α) {μ : OuterMeasure α} {μ' : OuterMeasure α} @[gcongr] -- remove this tag to make the last example work lemma mono_outerMeasure (h : μ ≤ μ') : μ a ≤ μ' a := h a example (h : μ ≤ μ') : μ a ≤ μ' a := by gcongr variable [MeasurableSpace α] {ν : Measure α} {ν' : Measure α} @[gcongr] lemma mono_measure (h : ν ≤ ν') : ν a ≤ ν' a := h a example (h : ν ≤ ν') : ν a ≤ ν' a := by with_reducible apply mono_outerMeasure set_option trace.Meta.isDefEq true in with_reducible gcongr ``` This aligns with the `congr!` tactic - Using `reducible` transparency is not compatible with the approach of matching `varyingArgs`, because when comparing instance arguments, we need to use at least `instances` transparency. So, instead of storing the lemmas by `varyingArgs`, we sort them by the number of varying arguments, and simply try applying all the lemmas (which should be cheap in `reducible` transparency). This aligns with `congr`/`congr!`(/`simp`) which also tries all of the lemmas for the given constant. - As a result of sorting the lemmas in the same way as `congr` lemmas, more recently added lemmas are now tried before older ones. This causes an issue which has to be solved by implementing a priority argument for the `gcongr` tag (similar to how `instance` and `simp` work), e.g.`@[gcongr high]`. This aligns with the `@[congr]` tag. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 330/293 Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Scalar.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Ring/Submonoid/Pointwise.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finset/NAry.lean,Mathlib/Data/Finset/Prod.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Data/List/Perm/Basic.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/ModEq.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/NAry.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/NumberTheory/Bertrand.lean,Mathlib/Order/Basic.lean,Mathlib/Order/BooleanAlgebra/Set.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/Filter/NAry.lean,Mathlib/Order/Filter/Prod.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Interval/Finset/Basic.lean,Mathlib/Order/Interval/Set/Basic.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/Sublattice.lean,Mathlib/RingTheory/Ideal/Prod.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GCongr/CoreAttrs.lean,Mathlib/Tactic/Monotonicity/Lemmas.lean,Mathlib/Topology/UniformSpace/Defs.lean,MathlibTest/GCongr/GCongr.lean,MathlibTest/GCongr/implications.lean,MathlibTest/GCongr/inequalities.lean,MathlibTest/GRewrite.lean 50 14 ['JovanGerb', 'Vtec234', 'fpvandoorn', 'github-actions', 'grunweg'] nobody
7-8664
7 days ago
15-83166
15 days ago
16-76584
16 days
27301 js2357
author:js2357
feat: `MeasureTheory.Measure.sum_restrict_le` Prove that `Measure.sum (fun i ↦ μ.restrict (s i)) ≤ M • μ.restrict (⋃ i, s i)`, if at most `M` of the `s i` overlap at a single point. Also add `restrict_biUnion_le`, which is a straightforward biUnion version of the existing `restrict_iUnion_le`. Done for the Carleson project. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) carleson t-measure-probability 87/0 Mathlib.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/SumRestrict.lean 3 1 ['github-actions'] nobody
6-82488
6 days ago
6-82495
6 days ago
6-82542
6 days
26843 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/) This PR continues the work from #23365. Original PR: https://github.com/leanprover-community/mathlib4/pull/23365 migrated-from-branch large-import t-meta 452/79 Mathlib/Data/List/ProdSigma.lean,Mathlib/Tactic/Simproc/ExistsAndEq.lean,MathlibTest/Simproc/ExistsAndEq.lean 3 8 ['JovanGerb', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'vasnesterov'] nobody
6-39576
6 days ago
19-38440
19 days ago
19-52492
19 days
27064 YaelDillies
author:YaelDillies
feat: considering an iso over `S` as an iso in `Over S` From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-category-theory 41/1 Mathlib/CategoryTheory/Comma/Over/OverClass.lean 1 1 ['github-actions'] robin-carlier
assignee:robin-carlier
6-37706
6 days ago
13-56439
13 days ago
13-56437
13 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'] robin-carlier
assignee:robin-carlier
6-37701
6 days ago
39-31619
1 month ago
39-31665
39 days
26989 joelriou
author:joelriou
feat(CategoryTheory): Artinian objects The API for Noetherian objects (from `Subobject.NoetherianObject`) is "dualized" in order to develop an API for Artinian objects. The previously existing definitions `ArtinianObject` and `NoetherianObject` from the file `CategoryTheory.Noetherian` are deprecated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-category-theory 176/58 Mathlib.lean,Mathlib/CategoryTheory/Noetherian.lean,Mathlib/CategoryTheory/Subobject/ArtinianObject.lean,Mathlib/CategoryTheory/Subobject/NoetherianObject.lean 4 1 ['github-actions', 'javra'] robin-carlier
assignee:robin-carlier
6-37694
6 days ago
15-45308
15 days ago
15-45358
15 days
27216 D-Thomine
author:D-Thomine
feat(Cardinal/Finite): ENat powers and cardinality This PR continues the work from #25574. Original PR: https://github.com/leanprover-community/mathlib4/pull/25574 t-algebra
label:t-algebra$
204/5 Mathlib.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/ENat/Pow.lean,Mathlib/SetTheory/Cardinal/Finite.lean 4 12 ['D-Thomine', 'eric-wieser', 'github-actions'] nobody
6-36936
6 days ago
7-39848
7 days ago
8-56920
8 days
27255 Louddy
author:Louddy
feat(SkewMonoidAlgebra): coeff_mul lemmas Add lemmas regarding the interaction of multiplication and the `SkewMonoidAlgebra.coeff`. 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$
124/0 Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean 1 1 ['github-actions'] nobody
6-32358
6 days ago
8-31319
8 days ago
8-31311
8 days
27283 Louddy
author:Louddy
feat(SkewMonoidAlgebra): maps on/to SkewMonoidAlgebra Add the definition of many maps regarding skew monoid algebras and lemmas associated to them. These all have their analogues for `MonoidAlgebra`. 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 t-algebra
label:t-algebra$
237/0 Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean 1 1 ['github-actions'] nobody
6-32293
6 days ago
7-56828
7 days ago
7-56878
7 days
27253 Louddy
author:Louddy
feat(SkewMonoidAlgebra): SkewMonoidAlgebra/Support Add lemmas regarding the support of a skew monoid algebra. It is currently missing a few lemmas compared to `MonoidAlgebra.support`. (See TODO.) These will be added as more results are available on `SkewMonoidAlgebra`. 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$
100/0 Mathlib.lean,Mathlib/Algebra/SkewMonoidAlgebra/Support.lean 2 1 ['github-actions'] nobody
6-32284
6 days ago
8-32756
8 days ago
8-32769
8 days
27308 xyzw12345
author:xyzw12345
feat(LinearAlgebra/SymmetricAlgebra): IsSymmetricAlgebra This PR continues the work from #24602. Original PR: https://github.com/leanprover-community/mathlib4/pull/24602 t-algebra
label:t-algebra$
78/0 Mathlib/LinearAlgebra/SymmetricAlgebra/Basic.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basis.lean 2 1 ['github-actions'] nobody
6-30820
6 days ago
6-30826
6 days ago
6-30879
6 days
27309 kckennylau
author:kckennylau
feat(CategoryTheory): a presheaf on `CostructuredArrow F d` can be extended to a presheaf on `C` --- Zulip: [#Is there code for X? > over category via a functor](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/over.20category.20via.20a.20functor/with/529574191) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 218/0 Mathlib.lean,Mathlib/CategoryTheory/Comma/Presheaf/LeftExtension.lean 2 1 ['github-actions'] nobody
6-27315
6 days ago
6-27829
6 days ago
6-27880
6 days
27312 pechersky
author:pechersky
feat(RingTheory/Valuation): the trivial valuation, as One (Valuation R Γ₀) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra t-number-theory
label:t-algebra$
54/0 Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/RingTheory/Valuation/Basic.lean 2 1 ['github-actions'] nobody
6-12041
6 days ago
6-12103
6 days ago
6-12096
6 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 47/14 Mathlib/Data/Nat/Digits/Defs.lean 1 2 ['github-actions', 'leanprover-community-bot-assistant'] nobody
6-9815
6 days ago
7-3337
7 days ago
27-49896
27 days
27292 gasparattila
author:gasparattila
feat: asymptotic cone of a set This PR defines the asymptotic cone of a set in a normed affine space and proves its main properties. This is partial progress towards showing that an unbounded finite-dimensional convex set contains a ray. --- - [ ] depends on: #27221 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 441/0 Mathlib.lean,Mathlib/Analysis/Normed/Affine/AsymptoticCone.lean,Mathlib/Order/Filter/Map.lean 3 6 ['AntoineChambert-Loir', 'gasparattila', 'github-actions', 'mathlib4-dependent-issues-bot'] nobody
6-9086
6 days ago
7-13909
7 days ago
7-14956
7 days
27163 pechersky
author:pechersky
feat(Topology/ValuativeRel): of and to basis of compatible valuations --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra t-topology t-number-theory
label:t-algebra$
110/5 Mathlib/RingTheory/Valuation/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean 2 1 ['github-actions'] nobody
5-71554
5 days ago
5-75747
5 days ago
11-30846
11 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$
89/1 Mathlib.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/RingTheory/RingHom/FaithfullyFlat.lean,Mathlib/RingTheory/RingHom/Flat.lean 4 7 ['chrisflav', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
5-64424
5 days ago
6-35596
6 days ago
62-15574
62 days
27321 kckennylau
author:kckennylau
feat(CategoryTheory): Colimit can be computed fiberwise We consider category `J` equipped with a functor `F : J ⥤ D` to a discrete category `D`. Then the colimit of any diagram `diagram : J ⥤ C` can be computed using the following algorithm: 1. For each `d : D`, compute the colimit of the restricted diagram `F.fiberIncl d ⋙ diagram`. 2. Take the coproduct of these colimits over all `d : D`. We call this "computing the colimit fiberwise". --- Zulip: [#Is there code for X? > over category via a functor](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/over.20category.20via.20a.20functor/with/529574191) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 134/0 Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Fiberwise.lean 2 1 ['github-actions'] nobody
5-50113
5 days ago
5-60069
5 days ago
5-60112
5 days
27325 or4nge19
author:or4nge19
feat(combinatorics): Path decomposition and boundary crossing This PR is the second in the series to build API for Quiver.Path in support of formalizing the Perron-Frobenius theorem. https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Formalizing.20Perron-Frobenius/with/529260566 This adds basic path decomposition and theorems about paths crossing set boundaries. Path Decomposition The PR introduces two fundamental ways to decompose any non-empty path p: eq_cons_of_ne_nil: Decomposes p into a prefix and a final edge (p = p'.cons e). eq_toPath_comp_of_ne_nil': Decomposes p into a first edge and a suffix (p = e.toPath.comp p'). These provide the structural induction principles needed for many proofs on paths. Boundary Crossing The main result is exists_boundary_edge, which formalizes the intuitive notion that a path starting outside a set S and ending inside it must cross the boundary. The theorem proves the existence of a "boundary edge" u ⟶ v (where u ∉ S and v ∈ S) and provides the full path decomposition at the point of crossing. Also included are: exists_boundary_edge_from_set: The symmetric version for paths leaving a set. exists_crossing_edge: A convenient corollary that guarantees the existence of a boundary-crossing edge without the full decomposition. This work will be used in subsequent PRs to reason about how paths interact with subsets of vertices, as utilized in our formalization of PF theorem Next Steps The next PR will introduce Path.vertices to create a list representation of the vertices a path visits, last prerequisite for defining path simplicity and cycles. new-contributor t-combinatorics 105/0 Mathlib.lean,Mathlib/Combinatorics/Quiver/Path/Decomposition.lean 2 1 ['github-actions'] nobody
5-31188
5 days ago
5-36970
5 days ago
5-37014
5 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
5-21100
5 days ago
38-24256
1 month ago
38-24260
38 days
27082 staroperator
author:staroperator
feat(Order/WellFoundedSet): add `Set.IsPWO.exists_le_minimal`, `Set.IsPWO.exists_minimal`, `Set.IsPWO.exists_minimalFor` which are the `IsPWO` version of `exists_minimal_le_of_wellFoundedLT` and others. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-order 22/0 Mathlib/Order/WellFoundedSet.lean 1 4 ['alreadydone', 'github-actions', 'staroperator'] nobody
4-72741
4 days ago
13-22155
13 days ago
13-22201
13 days
27332 or4nge19
author:or4nge19
feat(combinatorics): Define vertices of a Quiver.Path This PR is linked to #27315 and #27325. It's part of PRing the formalization of core PF theorem here https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Formalizing.20Perron-Frobenius/with/525516636 This adds: Quiver.Path.vertices: A List V representing the sequence of vertices along a path. Quiver.Path.vertices_set: The Set of vertices visited. Quiver.Path.vertices_finset: The Finset of vertices visited. Quiver.Path.init_finset: The Finset of vertices excluding the final vertex of the path, needed for defining simple paths and cycles. vertices_comp: A proof that the vertices of a composed path p.comp q are p.vertices.dropLast ++ q.vertices. vertices_length: The length of the vertices list is p.length + 1. Lemmas connecting vertices to standard list operations like head?, getLast, and get. Lemmas for membership: start_mem_vertices and end_mem_vertices. This is the prerequisite for defining path simplicity and formalizing cycle extraction, as used in the formalization of the Perron-Frobenius theorem --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-combinatorics 263/0 Mathlib.lean,Mathlib/Combinatorics/Quiver/Path/Vertices.lean 2 1 ['github-actions'] nobody
4-50873
4 days ago
5-6901
5 days ago
5-6954
5 days
27229 WilliamCoram
author:WilliamCoram
feat(GroupTheory/DoubleCoset): multiple lemmas From FLT --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
106/0 Mathlib/GroupTheory/DoubleCoset.lean 1 1 ['github-actions'] nobody
4-38828
4 days ago
9-26931
9 days ago
9-26982
9 days
26931 javra
author:javra
feat(CategoryTheory/Enriched): `V`-enriched isomorphisms Defines isomorphisms in `V`-enriched categories and relate them to ordinary isomorphisms in the case of ordinary enriched categories. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) infinity-cosmos t-category-theory 203/14 Mathlib.lean,Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/Enriched/Iso.lean,Mathlib/CategoryTheory/Enriched/Opposite.lean,Mathlib/CategoryTheory/Enriched/Ordinary/Basic.lean,Mathlib/CategoryTheory/Enriched/Ordinary/Iso.lean 6 12 ['emilyriehl', 'github-actions', 'javra', 'joelriou', 'mckoen'] nobody
4-33507
4 days ago
4-52202
4 days ago
17-40727
17 days
27339 pechersky
author:pechersky
chore(RingTheory/Laurent): use WithZero.exp to golf statements and proofs about valuation on K((X)) Done as part of refactor of Valued in #27314. This PR does not change any definitions. Instead, uses `WithZero.exp` instead of coercion + Multiplicative.ofAdd. And some helper simp lemmas about valuations of RatFunc vis a vis LaurentSeries. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) tech debt t-algebra t-number-theory
label:t-algebra$
78/77 Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean 3 1 ['github-actions'] nobody
4-29759
4 days ago
4-29759
4 days ago
4-73755
4 days
26875 michaellee94
author:michaellee94
feat(Manifold/PartitionOfUnity): existence of global C^n smooth section for nontrivial bundles Add existence of global C^n smooth section for nontrivial bundles --- - [x] depends on: #26671 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-differential-geometry 121/14 Mathlib/Geometry/Manifold/PartitionOfUnity.lean 1 8 ['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'michaellee94'] nobody
4-28760
4 days ago
16-21032
16 days ago
16-35704
16 days
27357 jcreedcmu
author:jcreedcmu
feat(Algebra/Module/Submodule): add `submoduleMap` for isometries Per [discussion on Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Analog.20of.20LinearEquiv.2EsubmoduleMap.20for.20AffineIsometryEquiv.3F), add a version of `.submoduleMap` for `LinearIsometry` and `LinearIsometryEquiv` by analogy with `LinearMap.submoduleMap` and `LinearEquiv.submoduleMap`. --- new-contributor t-algebra
label:t-algebra$
56/0 Mathlib.lean,Mathlib/Analysis/Normed/Operator/LinearIsometrySubmoduleMap.lean 2 12 ['Ruben-VandeVelde', 'eric-wieser', 'github-actions', 'jcreedcmu'] nobody
4-4124
4 days ago
4-9307
4 days ago
4-9359
4 days
27370 euprunin
author:euprunin
chore(Tactic/CancelDenoms): golf `cancel_factors_eq` t-meta 1/11 Mathlib/Tactic/CancelDenoms/Core.lean 1 1 ['github-actions'] nobody
3-86345
3 days ago
3-86364
3 days ago
4-13
4 days
26782 euprunin
author:euprunin
chore: golf Algebra/ using `exact` t-algebra
label:t-algebra$
65/168 Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/CubicDiscriminant.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Algebra/Homology/Embedding/Extend.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShiftSequence.lean,Mathlib/Algebra/Homology/ShortComplex/ConcreteCategory.lean,Mathlib/Algebra/Homology/ShortComplex/Exact.lean,Mathlib/Algebra/Homology/ShortComplex/PreservesHomology.lean,Mathlib/Algebra/Homology/ShortComplex/QuasiIso.lean,Mathlib/Algebra/IsPrimePow.lean,Mathlib/Algebra/Lie/CartanExists.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/NoZeroDivisors.lean,Mathlib/Algebra/MvPolynomial/Rename.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Expand.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/Algebra/PresentedMonoid/Basic.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Algebra/Star/Pointwise.lean 32 10 ['euprunin', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot'] nobody
3-86097
3 days ago
3-86122
3 days ago
21-40318
21 days
27380 chrisflav
author:chrisflav
feat(Category/Ring): `Algebra.IsPushout` iff `CategoryTheory.IsPushout` In particular, `RingHom.IsStableUnderBaseChange P` iff `(RingHom.toMorphismProperty P).IsStableUnderCobaseChange`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
49/0 Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/RingHomProperties.lean 3 1 ['github-actions'] nobody
3-59834
3 days ago
3-59905
3 days ago
3-59888
3 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 13 ['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'robin-carlier', 'yuma-mizuno'] nobody
3-57425
3 days ago
3-57444
3 days ago
27-35172
27 days
27174 ADedecker
author:ADedecker
chore(OreLocalization): generalize some results from rings to monoids with zeros --- My motivation is getting a more conceptual construction of [ValuativeRel.ValueGroupWithZero](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Valuation/ValuativeRel.html#ValuativeRel.ValueGroupWithZero), but I think this is of independent interest. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
104/73 Mathlib.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/NonZeroDivisors.lean,Mathlib/RingTheory/OreLocalization/Ring.lean 4 2 ['github-actions', 'leanprover-community-bot-assistant'] nobody
3-52698
3 days ago
3-53155
3 days ago
10-81726
10 days
27040 Scarlett-le
author:Scarlett-le
feat(Geometry/Euclidean/Sphere/Power): add power of a point theorems Add the definition of power of a point and fundamental theorems relating point positions to intersection distances: * `Sphere.power`: The power of a point with respect to a sphere, defined as the square of the distance from the point to the center minus the square of the radius. * `Sphere.power_eq_zero_iff_mem_sphere`: A point lies on the sphere if and only if its power is zero. * `Sphere.power_pos_iff_dist_center_gt_radius`: The power is positive if and only if the point is outside the sphere. * `Sphere.power_neg_iff_dist_center_lt_radius`: The power is negative if and only if the point is inside the sphere. * `Sphere.mul_dist_eq_power_of_dist_center_gt_radius`: For external points, the product of intersection distances equals the power. * `Sphere.mul_dist_eq_neg_power_of_dist_center_lt_radius`: For internal points, the product equals the negative power. * `Sphere.mul_dist_eq_abs_power`: General form relating intersection distance products to absolute power. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-euclidean-geometry 138/1 Mathlib/Geometry/Euclidean/Sphere/Power.lean 1 3 ['alreadydone', 'github-actions'] jsm28
assignee:jsm28
3-48328
3 days ago
14-15795
14 days ago
14-16336
14 days
26847 joelriou
author:joelriou
feat: multicoequalizers in the category of types This PR gives a concrete criteria for a multicofork in the category of types to be a multicoequalizer, and this is used in order to show that if a (sub)set `A : Set X` is the union of certain subsets `U i`, then the type `A` is the multicoequalizer of the `U i`s along their intersections `V i j`. (A similar result for `Subpresheaf` rather than `Set` will be deduced in a separate PR, and this shall be very important in the study of the homotopy theory of simplicial sets, as this will allow the construction of morphisms from horns.) --- - [x] depends on: #25823 - [x] depends on: #22205 - [x] depends on: #26037 This PR continues the work from #23872. Original PR: https://github.com/leanprover-community/mathlib4/pull/23872 t-category-theory 96/0 Mathlib.lean,Mathlib/CategoryTheory/Limits/Types/Multicoequalizer.lean 2 n/a ['adomani', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
3-41436
3 days ago
unknown
unknown
27333 FrankieNC
author:FrankieNC
feat(Topology/Baire): adds that in a Baire space, every nonempty open set is of second category. In a Baire space, every nonempty open set is non‑meagre. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 10/0 Mathlib/Topology/Baire/Lemmas.lean 1 1 ['github-actions'] nobody
3-38673
3 days ago
3-38673
3 days ago
5-5121
5 days
26655 Rida-Hamadani
author:Rida-Hamadani
feat(SimpleGraph): sub-walks defines (contiguous) subwalks and provides lemmas about them. Co-authored-by: Kyle Miller Co-authored-by: Vlad Tsyrklevich --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 176/0 Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Data/List/Infix.lean 3 20 ['Rida-Hamadani', 'github-actions', 'jt496', 'kmill', 'vlad902'] nobody
3-20144
3 days ago
23-54813
23 days ago
23-54865
23 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 197/89 Mathlib/CategoryTheory/Limits/Shapes/DisjointCoproduct.lean 1 5 ['chrisflav', 'github-actions', 'robin-carlier'] robin-carlier
assignee:robin-carlier
3-20086
3 days ago
3-20101
3 days ago
34-67376
34 days
27067 robin-carlier
author:robin-carlier
feat(CategoryTheory/Monoidal/DayConvolution): braiding and symmetry for Day convolution In this PR, we prove that when `C` and `V` are braided monoidal categories, and when relevant Day convolutions exist, the unbundled Day convolution monoidal structure on `C ⥤ V` is also braided: we construct an isomorphism `DayConvolution.braiding`, characterize it with respect to the unit maps that exhibits Day convolutions as left Kan extensions, and prove that the forward and reverse hexagon identities are satisfied. In the case `C` and `V` are symmetric, we show that `braiding F G|>.hom` is inverse to `braiding G F|>.hom` as well. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 201/1 Mathlib.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean 3 2 ['github-actions', 'leanprover-community-bot-assistant'] nobody
3-17074
3 days ago
3-17099
3 days ago
13-38338
13 days
26798 robin-carlier
author:robin-carlier
feat(CategoryTheory/Monoidal/DayConvolution): `LawfulDayConvolutionMonoidalCategoryStruct` Given monoidal categories `C`, `V` and a category `D` with a pre-existing `MonoidalCategoryStruct`, we introduce a typeclass `LawfulDayConvolutionMonoidalCategoryStruct C V D` that bundles the required data and equations that the structure on `D` must have to be a monoidal subcategory of `C ⥤ V` if the latter was endowed with the day convolution monoidal structure. The data in question is that of a faithful functor `ι : D ⥤ C ⥤ V`, as well as explicit natural transformations `ι.obj d ⊠ (ι.obj d') ⟶ tensor C ⋙ ι.obj (d ⊗ d')` that exhibit `ι.obj (d ⊗ d')` as a Day convolution of `ι.obj d` and `(ι.obj d')`, as well as similar data asserting that `ι.obj (𝟙_ D)` is a Day convolution unit. The equations required are identical to the ones that characterize the unitors and associators for Day convolution with respect to the Kan extensions units. Given such a structure, using that the corresponding relations hold in `C ⥤ V`, we show that the monoidal category structure on `D` defines a `MonoidalCategory D`, i.e that all the required equations such as the pentagon/triangular equalities, bifunctoriality of the tensor product etc. are satisfied. Thus, we can think of `LawfulDayConvolutionMonoidalCategoryStruct C V D` as a constructor for monoidal categories. While this is a step towards a Day convolution monoidal structure in (a type alias) `C ⥤ V`, the framework is yet incomplete, as it assumes a pre-existing monoidal category structure. We will give constructors for (`MonoidalCategoryStruct` and) `LawfulDayConvolutionMonoidalCategoryStruct C V D` with various degree of definitional control over the resulting structure in a forthcoming PR. --- - [x] depends on: #25757 I recommend the reviewer to at least have a glance at #26820 to see where this is going, and how this one fits in the design I have in mind. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 336/8 Mathlib/CategoryTheory/Monoidal/DayConvolution.lean 1 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
3-15854
3 days ago
3-18257
3 days ago
13-9720
13 days
27399 MoritzBeroRoos
author:MoritzBeroRoos
feat: replace every usage of ⬝ᵥ (with old \cdot) by ·ᵥ (with \centerdot) Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations `\cdot` and `\centerdot` resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for `center`..): - `\cdot` gives ⬝ [U+2B1D](https://www.compart.com/en/unicode/U+2B1D) "Black Very Small Square" - `\centerdot` gives · [U+00B7](https://www.compart.com/en/unicode/U+00B7) "Middle Dot" Mathlib mostly uses the `\centerdot` variant, except for the dotProduct notation and some probably unsuspecting people wanting \centerdot but getting \cdot in their comments and 6 uses of a notation using the raw `\cdot` without any subscript at `Mathlib\Topology\Homotopy\Product.lean`. This PR replaces the dot product `⬝ᵥ` with its `\centerdot` counterpart `·ᵥ`. The related PR [here](https://github.com/leanprover/vscode-lean4/pull/639) can then overwrite the `\cdot` abbreviation, to produce the same symbol as the `centerdot` abbreviation does. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 133/133 Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/Topology/Instances/Matrix.lean 25 5 ['MoritzBeroRoos', 'eric-wieser', 'github-actions'] nobody
3-8106
3 days ago
3-16588
3 days ago
3-16624
3 days
27403 MoritzBeroRoos
author:MoritzBeroRoos
feat: replace probably erroneous usage of ⬝ (with old \cdot) by · (with \centerdot) Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations \cdot and \centerdot resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for center..). This pr replaces instances of ⬝ where · was probably meant. All of the replacement is in comments, except for the file bench_summary.lean which is used for priting the github benchmark results. Since this file is about scientific notation of numbers, sure · was meant to be used, not a rectangle. [Related](https://github.com/leanprover-community/mathlib4/pull/27399) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 195/195 Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/DirectSum/Idempotents.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/Normed/Unbundled/InvariantExtension.lean,Mathlib/Analysis/SpecialFunctions/Complex/CircleAddChar.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/FieldTheory/PurelyInseparable/PerfectClosure.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/NumberTheory/SiegelsLemma.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Instances/Matrix.lean,scripts/bench_summary.lean 49 3 ['eric-wieser', 'github-actions'] nobody
3-5361
3 days ago
3-8851
3 days ago
3-8845
3 days
27406 tb65536
author:tb65536
feat(MeasureTheory/Measure/AddContent): Add lemma `addContent_biUnion_eq` This PR adds a lemma `addContent_biUnion_eq` stating than an `AddContent` is additive on a finite pairwise disjoint union. We already have the inequality `addContent_biUnion_le` without the pairwise disjoint assumption. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-measure-probability 16/0 Mathlib/MeasureTheory/Measure/AddContent.lean 1 1 ['github-actions'] nobody
3-3589
3 days ago
3-3589
3 days ago
3-3573
3 days
27277 artie2000
author:artie2000
feat(Logic/Equiv): `Equiv` on `Subtype` implies equivalence of existence statements * Add lemmas stating that an `Equiv` between `Subtypes` implies the equivalence of the corresponding `Exists` and `ExistsUnique` propositions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 9/0 Mathlib/Logic/Equiv/Defs.lean 1 6 ['YaelDillies', 'artie2000', 'eric-wieser', 'github-actions'] nobody
3-2210
3 days ago
7-72044
7 days ago
7-74264
7 days
26031 joelriou
author:joelriou
feat(Algebra/Homology): the derived category of a linear abelian category is linear --- - [x] depends on: #25931 This PR continues the work from #24596. Original PR: https://github.com/leanprover-community/mathlib4/pull/24596 t-category-theory 71/0 Mathlib.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/Algebra/Homology/HomotopyCategory/Shift.lean,Mathlib/Algebra/Homology/HomotopyCategory/SingleFunctors.lean 4 n/a ['AntoineChambert-Loir', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot'] nobody
2-64921
2 days ago
unknown
unknown
27378 peakpoint
author:peakpoint
refactor(Geometry/Euclidean/Projection): redefine projection and reflection for affine subspaces This PR continues the work from #25578. Original PR: https://github.com/leanprover-community/mathlib4/pull/25578 new-contributor t-euclidean-geometry 316/317 Mathlib/Analysis/Normed/Affine/ContinuousAffineMap.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Geometry/Euclidean/Circumcenter.lean,Mathlib/Geometry/Euclidean/Projection.lean 4 3 ['github-actions', 'peakpoint'] nobody
2-64081
2 days ago
2-64081
2 days ago
2-64630
2 days
26958 joelriou
author:joelriou
feat(AlgebraicTopology): path objects in model categories This PR dualizes #26171 which was about cylinder objects. --- - [x] depends on: #26171 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 335/0 Mathlib.lean,Mathlib/AlgebraicTopology/ModelCategory/IsCofibrant.lean,Mathlib/AlgebraicTopology/ModelCategory/PathObject.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean 4 4 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
2-48530
2 days ago
2-48550
2 days ago
4-57531
4 days
26967 joelriou
author:joelriou
feat(AlgebraicTopology/ModelCategory): left homotopies This PR studies the notion of "left homotopy" given by cylinder objects in model categories. --- - [x] depends on: #26171 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 303/0 Mathlib.lean,Mathlib/AlgebraicTopology/ModelCategory/LeftHomotopy.lean 2 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
2-48500
2 days ago
2-48523
2 days ago
4-23447
4 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$
268/4 Mathlib.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/SubtypeNeLift.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean,Mathlib/SetTheory/Cardinal/Finite.lean 9 11 ['eric-wieser', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant'] nobody
2-48369
2 days ago
2-48392
2 days ago
26-3730
26 days
27305 eric-wieser
author:eric-wieser
feat: instances for `ZeroHom` and `OneHom` This is motivated by wanting to write some lemmas about how the def in #27272 behaves on addition and scalar multiplcation, which requires these operations to first be defined. This shows that `ZeroHom` forms an `AddCommGroup` and `Module`, as well as analogous intermediate statements and `OneHom` results. --- - [x] depends on: #27318 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
188/8 Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Hom.lean,Mathlib/Algebra/Module/Hom.lean,Mathlib/GroupTheory/GroupAction/DomAct/Basic.lean 6 3 ['eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot'] nobody
2-48353
2 days ago
3-9197
3 days ago
3-9181
3 days
27417 PierreQuinton
author:PierreQuinton
feat: add `SigmaCompleteLattice` A $\sigma$-complete lattice is a lattice in which every countable subset `s` has a least upper bound and a greatest lower bound, denoted below by `sSup s` and `sInf s`. This PR adds the classes `SigmaCompleteLattice` as well as some theorems (mainly adapted from `CompleteLattice` and `ConditionallyCompleteLattice`). This is an adaptation of #26318 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order 394/0 Mathlib.lean,Mathlib/Order/SigmaCompleteLattice.lean 2 3 ['PierreQuinton', 'github-actions', 'vihdzp'] nobody
2-45255
2 days ago
2-56793
2 days ago
2-56841
2 days
27230 paulorauber
author:paulorauber
feat(Probability): Prove Hoeffding's lemma corollary Prove a corollary of Hoeffding's lemma for random variables with non-zero expectation. This simple corollary was suggested by a reviewer based on a recent contribution (#26744). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 18/9 Mathlib/Probability/Moments/SubGaussian.lean 1 1 ['github-actions'] nobody
2-30925
2 days ago
9-25015
9 days ago
9-25065
9 days
27419 grunweg
author:grunweg
chore(IntegrableOn): generalise one more section to enorms --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) carleson t-measure-probability 139/96 Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/SpecialFunctions/ImproperIntegrals.lean,Mathlib/Analysis/SpecialFunctions/Integrability/Basic.lean,Mathlib/Analysis/SpecialFunctions/Integrals/LogTrigonometric.lean,Mathlib/MeasureTheory/Integral/ExpDecay.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Periodic.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Integral.lean,Mathlib/NumberTheory/AbelSummation.lean,Mathlib/NumberTheory/LSeries/SumCoeff.lean 12 3 ['github-actions', 'grunweg', 'sgouezel'] nobody
2-26884
2 days ago
2-54881
2 days ago
2-54932
2 days
27183 pechersky
author:pechersky
feat(RingTheory/ValuativeRel): IsRankLeOne when there is a compatible Zm0 or NNReal valuation and then provide it for Q_[p] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-algebra t-number-theory
label:t-algebra$
76/21 Mathlib/NumberTheory/Padics/ValuativeRel.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/RingTheory/Valuation/ValuativeRel.lean 3 12 ['adamtopaz', 'github-actions', 'pechersky'] nobody
2-19919
2 days ago
2-19926
2 days ago
10-647
10 days
27439 Vierkantor
author:Vierkantor
chore(*): review 2024-04-01 adaptation notes There are three kinds of adaptation notes from the changes on 2024-04-01. One about `erw` "blowing up"; this referred to a backwards compatibility flag that was already removed long ago (#14064). So this can just be deleted. A few about needing to use `symm` before `ext` fires: this is because `apply` failing to unify when mixing very general limit definitions and very specific operations for equalizers/pullbacks. I propose we fix this by unfolding the terms manually in an `intro` type ascription. In the longer term we should consider instead specializing the limit lemmas to these specific shapes. A few about `aesop` not working. This has the same underlying cause, due to `ext` not applying, so it now looks like `intro s (m : _ --> _) x; aesop`. Same specializing of the limit lemmas may be useful here. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) tech debt 8/25 Mathlib/AlgebraicGeometry/Spec.lean,Mathlib/CategoryTheory/Limits/Shapes/KernelPair.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean 4 1 ['github-actions'] nobody
2-18579
2 days ago
2-18655
2 days ago
2-18640
2 days
27385 grunweg
author:grunweg
feat: weaken definiteness requirement for `ENormed(Add)(Comm)Monoid`s Most lemmas about these do not require the enorm to be positive definite (i.e., work fine if a nontrivial element has zero enorm), or can be rephrased easily. A handful of lemmas do require this condition. Weaken the definition of `ENormed(Add)(Comm)Monoid`s to only ask that zero have enorm zero, and add new classes `StrictENormed(Add)(Comm)Monoid` which also ask for definiteness. Most existing lemmas are kept unchanged (i.e., have slightly weaker hypotheses now); a few have their typeclasses adjusted. The motivating example behind this is `eLpNorm`, which is an enormed commutative (additive) monoid --- when we drop the definiteness requirement. This will (hopefully) allow unifying many lemma about `eLpNorm` with their more general enorm variants. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) carleson t-analysis 94/39 Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean 6 3 ['github-actions', 'grunweg'] nobody
2-14122
2 days ago
2-14374
2 days ago
2-14359
2 days
27424 vihdzp
author:vihdzp
feat: interval in archimedean field contains fraction with large enough denominator This is a slight generalization of `exists_rat_btwn` that can be used, for instance, to prove that there's a dyadic rational between any two elements. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-algebra
label:t-algebra$
13/11 Mathlib/Algebra/Order/Archimedean/Basic.lean 1 2 ['Ruben-VandeVelde', 'github-actions'] nobody
2-13514
2 days ago
2-13514
2 days ago
2-46677
2 days
27427 alreadydone
author:alreadydone
chore(RingTheory): use `extend` instead of `abbrev` in `IsS(emis)impleModule` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
46/37 Mathlib/Algebra/Category/ModuleCat/Simple.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/LinearAlgebra/RootSystem/Irreducible.lean,Mathlib/LinearAlgebra/Semisimple.lean,Mathlib/RepresentationTheory/Maschke.lean,Mathlib/RingTheory/Length.lean,Mathlib/RingTheory/SimpleModule/Basic.lean,Mathlib/RingTheory/SimpleModule/Rank.lean 8 4 ['alreadydone', 'github-actions', 'leanprover-bot'] nobody
2-13502
2 days ago
2-13502
2 days ago
2-13486
2 days
27116 pechersky
author:pechersky
feat(Valued): FaithfulSMul to completion simplifies coercions and golfs existing instance --- [![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$
16/6 Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean 2 1 ['github-actions'] nobody
2-8309
2 days ago
12-63308
12 days ago
12-63310
12 days
27107 AntoineChambert-Loir
author:AntoineChambert-Loir
feat(GroupTheory/GroupAction/SubMulAction/Combination) : combinations and group actions `Nat.Combination X n` is the type all `s : Finset X` such that `s.card = n`. This PR provides some API for this subtype and the `SubMulAction` it inherits when a group acts on `X`. It will be used in conjunction with the description of some maximal subgroups of `Equiv.Perm X` to construct primitive actions. Question on the names: when `X` is a fintype, there is docs#Finset.powersetCard` that gives the same object, as a docs#Finset. But the present PR also applies when `X` is infinite. Then maybe `Nat.Combination` should be renamed as `Set.powersetCard`? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
318/0 Mathlib.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/Combination.lean 3 2 ['github-actions', 'tb65536'] nobody
2-8131
2 days ago
12-78032
12 days ago
12-78077
12 days
26783 matthewjasper
author:matthewjasper
feat(RingTheory/Flat): Add theorems relating Submodule.torsion and Module.Flat Co-authored-by: Kevin Buzzard --- This PR continues the work from #25334. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) FLT new-contributor t-algebra
label:t-algebra$
205/0 Mathlib.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/RingTheory/Flat/TorsionFree.lean,Mathlib/RingTheory/Ideal/IsPrincipal.lean 5 1 ['github-actions'] nobody
2-7103
2 days ago
21-39545
21 days ago
21-39575
21 days
27320 Jlh18
author:Jlh18
doc (CategoryTheory/Bicategory/Grothendieck): rename Grothendieck to coGrothendieck Rename `CategoryTheory.Pseudofunctor.Grothendieck` to `CategoryTheory.Pseudofunctor.coGrothendieck`. Currently there are two inconsistent conventions taken in [`CategoryTheory.Grothendieck`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/CategoryTheory/Grothendieck.html#CategoryTheory.Grothendieck) and [`CategoryTheory.Pseudofunctor.Grothendieck`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/CategoryTheory/Bicategory/Grothendieck.html#CategoryTheory.Pseudofunctor.Grothendieck), namely the latter includes an `op` on the indexing category / base category of the Grothendieck construction. Later on, I will make more PRs to introduce the version of `CategoryTheory.Pseudofunctor.Grothendieck` that does not have an `op`. Zulip discussion: [#mathlib4 > Refactor Grothendieck from Pseudofunctor.Grothendieck](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Refactor.20Grothendieck.20from.20Pseudofunctor.2EGrothendieck/with/529165679). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-category-theory 21/13 Mathlib/CategoryTheory/Bicategory/Grothendieck.lean,Mathlib/CategoryTheory/FiberedCategory/Grothendieck.lean 2 1 ['github-actions'] nobody
2-2689
2 days ago
2-15712
2 days ago
3-78810
3 days
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 30/0 Mathlib/Data/Sum/Order.lean 1 4 ['eric-wieser', 'github-actions', 'kckennylau', 'vihdzp'] nobody
2-2593
2 days ago
24-69380
24 days ago
24-69644
24 days
27450 eric-wieser
author:eric-wieser
chore(LinearAlgebra/QuadraticForm): missing `coe_mk` and `norm_cast` Also fixes an over-applied `simps`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra easy
label:t-algebra$
12/8 Mathlib/LinearAlgebra/QuadraticForm/Basic.lean 1 1 ['github-actions'] nobody
1-84453
1 day ago
1-84467
1 day ago
1-84513
1 day
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$
120/37 Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Trace/Basic.lean 3 1 ['github-actions'] nobody
1-82277
1 day ago
31-54247
1 month ago
31-54298
31 days
27452 JovanGerb
author:JovanGerb
chore(to_additive): remove superfluous `List.reverse` This `List.reverse` seems to not affect anything. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 0/1 Mathlib/Tactic/ToAdditive/Frontend.lean 1 1 ['github-actions'] nobody
1-81876
1 day ago
1-82189
1 day ago
1-82240
1 day
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 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
1-80889
1 day ago
1-80913
1 day ago
44-34420
44 days
27453 pechersky
author:pechersky
feat(Topology/UniformSpace/Ultra): completion is ultra uniformity iff base is Supersedes #24628 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 159/5 Mathlib.lean,Mathlib/Order/Filter/NAry.lean,Mathlib/Order/Filter/Prod.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/Ultra/Basic.lean,Mathlib/Topology/UniformSpace/Ultra/Completion.lean 7 1 ['github-actions'] nobody
1-80034
1 day ago
1-80094
1 day ago
1-80090
1 day
26833 pechersky
author:pechersky
feat(ValuativeRel): MulArchimedean (ValueGroupWithZero R) when IsRankLeOne with a proof_wanted for the reverse implication --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order t-algebra t-number-theory easy
label:t-algebra$
13/0 Mathlib/RingTheory/Valuation/ValuativeRel.lean 1 5 ['github-actions', 'pechersky', 'wwylele'] nobody
1-77264
1 day ago
1-79566
1 day ago
19-68557
19 days
27455 pechersky
author:pechersky
chore(NumberTheory/Padics/Hensel): rephrase using `aeval` This is easier to use at call site, because on need not pass `Polynomial.map (algebraMap _ _ )` in the use of `hensels_lemma` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) tech debt t-algebra t-number-theory
label:t-algebra$
157/138 Mathlib/NumberTheory/Padics/Hensel.lean 1 1 ['github-actions'] nobody
1-73876
1 day ago
1-73931
1 day ago
1-73930
1 day
27422 vihdzp
author:vihdzp
feat: relate images to pointwise negation/inverses These lemmas kept coming up in the CGT repo. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data t-algebra
label:t-algebra$
13/0 Mathlib/Algebra/Group/Pointwise/Set/Basic.lean 1 7 ['YaelDillies', 'github-actions', 'vihdzp'] nobody
1-57744
1 day ago
2-2838
2 days ago
2-15502
2 days
27254 yuanyi-350
author:yuanyi-350
2025 imo problem3 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import IMO 354/3 Archive.lean,Archive/Imo/Imo2025Q3.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/Ring/Int/Parity.lean,Mathlib/Algebra/Ring/Parity.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/NumberTheory/Multiplicity.lean,Mathlib/NumberTheory/Padics/PadicVal/Basic.lean 8 17 ['github-actions', 'madvorak', 'themathqueen', 'wwylele', 'yuanyi-350'] nobody
1-55762
1 day ago
5-67736
5 days ago
7-26066
7 days
26840 oliver-butterley
author:oliver-butterley
feat(Mathlib/Dynamics/BirkhoffSum/Average): add 3 BirkhoffAverage lemmas - `birkhoffAverage_add` - `birkhoffAverage_neg` - `birkhoffAverage_sub` Co-authored-by: Lua Viana Reis --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-dynamics 22/1 Mathlib/Dynamics/BirkhoffSum/Average.lean 1 2 ['ADedecker', 'github-actions'] nobody
1-51113
1 day ago
19-55878
19 days ago
19-55935
19 days
27458 Louddy
author:Louddy
feat(Composition): add simp lemmas Add two simp lemmas `embedding_comp_inv` and `index_embedding`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics easy 2/0 Mathlib/Combinatorics/Enumerative/Composition.lean 1 1 ['github-actions'] nobody
1-50004
1 day ago
1-50004
1 day ago
1-52363
1 day
27355 alreadydone
author:alreadydone
feat(Algebra): annihilator of fg module over PID is ann of some element Live coding at *Formalizing Class Field Theory* for the finite case of the normal basis theorem --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
50/0 Mathlib/Algebra/Module/PID.lean,Mathlib/RingTheory/Ideal/Maps.lean 2 6 ['alreadydone', 'github-actions', 'kckennylau'] nobody
1-45965
1 day ago
4-18723
4 days ago
4-18707
4 days
27451 kckennylau
author:kckennylau
feat(RingTheory/Valuation): define ball, closed ball, and sphere *From the 2025 Local Class Field Theory Workshop.* --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
27/0 Mathlib/RingTheory/Valuation/Basic.lean 1 3 ['JovanGerb', 'github-actions', 'pechersky'] nobody
1-45576
1 day ago
1-82282
1 day ago
1-82332
1 day
27257 JovanGerb
author:JovanGerb
feat(LinearAlgebra/AffineSpace/Ordered): add `lineMap_le_lineMap_iff_of_lt'` I only need `lineMap_le_lineMap_iff_of_lt'`. The other lemmas are added for completeness. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-algebra
label:t-algebra$
44/0 Mathlib/LinearAlgebra/AffineSpace/Ordered.lean 1 3 ['Ruben-VandeVelde', 'eric-wieser', 'github-actions'] nobody
1-42379
1 day ago
2-12843
2 days ago
8-23580
8 days
27430 erdOne
author:erdOne
feat(Algebra/Order): Locally Finite Linearly Ordered Abelian Groups We prove that `ℤ` is the only Locally Finite Linearly Ordered Abelian Group. We also move `OrderMonoidIso.toAdditive` and friends from `Mathlib/GroupTheory/ArchimedeanDensely.lean` to a new file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-order t-algebra
label:t-algebra$
296/74 Mathlib.lean,Mathlib/Algebra/Order/Hom/TypeTags.lean,Mathlib/Algebra/Order/Monoid/LocallyFiniteOrder.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean 4 12 ['YaelDillies', 'github-actions', 'kbuzzard', 'pechersky'] nobody
1-40722
1 day ago
2-32430
2 days ago
2-32923
2 days
27383 euprunin
author:euprunin
chore: replace `omega` with `grind` in `Algebra/` theorems/lemmas where applicable Motivation: `grind` subsumes `omega`, which is expected to be deprecated. bench-after-CI t-algebra
label:t-algebra$
226/226 Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/CubicDiscriminant.lean,Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Int/Even.lean,Mathlib/Algebra/Group/Nat/Even.lean,Mathlib/Algebra/Group/Nat/Range.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/EnoughInjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/EnoughProjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Fractions.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Homology/Embedding/Boundary.lean,Mathlib/Algebra/Homology/Embedding/CochainComplex.lean,Mathlib/Algebra/Homology/Embedding/Connect.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexShift.lean,Mathlib/Algebra/Homology/HomotopyCategory/Pretriangulated.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShiftSequence.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Homology/TotalComplexShift.lean,Mathlib/Algebra/Lie/LieTheorem.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/Sl2.lean,Mathlib/Algebra/Lie/Weights/Chain.lean,Mathlib/Algebra/Lie/Weights/Killing.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/Order/Antidiag/Nat.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Group/Int/Sum.lean,Mathlib/Algebra/Order/Group/Unbundled/Int.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean,Mathlib/Algebra/Order/Ring/Int.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Degree/IsMonicOfDegree.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Algebra/Polynomial/OfFn.lean,Mathlib/Algebra/Polynomial/Sequence.lean,Mathlib/Algebra/Polynomial/UnitTrinomial.lean,Mathlib/Algebra/Ring/Divisibility/Lemmas.lean,Mathlib/Algebra/Squarefree/Basic.lean,Mathlib/Algebra/Vertex/VertexOperator.lean 58 12 ['euprunin', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] nobody
1-37744
1 day ago
1-37801
1 day ago
3-51168
3 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 105/0 Mathlib/Data/Sum/Basic.lean,Mathlib/Topology/Constructions/SumProd.lean 2 4 ['ADedecker', 'github-actions'] nobody
1-36346
1 day ago
38-31045
1 month ago
38-31037
38 days
27460 IvanRenison
author:IvanRenison
feat(Combinatorics/SimpleGraph/Walk): add theorems about membership on the support of `Walk.concat` This contribution was created as part of the Utrecht Summerschool "Formalizing Mathematics in Lean" in July 2025. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 18/0 Mathlib/Combinatorics/SimpleGraph/Walk.lean 1 1 ['github-actions'] nobody
1-36053
1 day ago
1-47654
1 day ago
1-47697
1 day
27461 IvanRenison
author:IvanRenison
feat(Combinatorics/SimpleGraph/Paths): add lemma `SimpleGraph.Walk.IsPath.mem_support_iff_exists_append` This contribution was created as part of the Utrecht Summerschool "Formalizing Mathematics in Lean" in July 2025. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 14/0 Mathlib/Combinatorics/SimpleGraph/Paths.lean 1 1 ['github-actions'] nobody
1-36044
1 day ago
1-47019
1 day ago
1-47065
1 day
27464 IvanRenison
author:IvanRenison
feat(Combinatorics/SimpleGraph/Paths): add lemma `SimpleGraph.Walk.IsPath.ne_of_mem_support_of_append` This contribution was created as part of the Utrecht Summerschool "Formalizing Mathematics in Lean" in July 2025. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 7/0 Mathlib/Combinatorics/SimpleGraph/Paths.lean 1 1 ['github-actions'] nobody
1-36037
1 day ago
1-45369
1 day ago
1-45420
1 day
27468 IvanRenison
author:IvanRenison
feat(Combinatorics/SimpleGraph): add theorem `SimpleGraph.Connected.diff_dist_adj` This contribution was created as part of the Utrecht Summerschool "Formalizing Mathematics in Lean" in July 2025. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 16/0 Mathlib/Combinatorics/SimpleGraph/Metric.lean 1 1 ['github-actions'] nobody
1-36031
1 day ago
1-37552
1 day ago
1-37652
1 day
27457 grunweg
author:grunweg
feat(LocallyIntegrable): generalise the first half of the file to enorms --- This is not exhaustive; all `smul` lemmas can also be generalised (assuming suitable typeclasses). That will happen in a separate PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) carleson t-measure-probability 90/48 Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean 2 1 ['github-actions'] nobody
1-35992
1 day ago
1-56114
1 day ago
1-56159
1 day
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$
469/67 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,docs/1000.yaml 9 5 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
1-35335
1 day ago
1-35484
1 day ago
69-80426
69 days
27331 Equilibris
author:Equilibris
feat(Data/List/Pairwise): Add two lemmas about pairwise and pwFilter - `Pairwise.mem_list_of_mem_pwFilter` states that every member of a pwFilter is a mem of the list pwFilter is in - `pairwise_pwfilter_of_pairwise` show how pwFilter maintains a generic pairwise structure --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor 32/0 Mathlib/Data/List/Pairwise.lean 1 1 ['github-actions'] nobody
1-35152
1 day ago
1-35152
1 day ago
2-26445
2 days
27471 FrankieNC
author:FrankieNC
feat(Topology/Baire): In a nonempty Baire space, any dense GDelta set is not meagre Proves that in a nonempty Baire space any dense Gδ set is not meagre --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 7/0 Mathlib/Topology/Baire/Lemmas.lean 1 1 ['github-actions'] nobody
1-32782
1 day ago
1-32906
1 day ago
1-32959
1 day
27368 alreadydone
author:alreadydone
feat(FieldTheory/Finite): minimal polynomial of Frobenius for the normal basis theorem at *Formalizing Class Field Theory* --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
37/5 Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Minpoly/Basic.lean 4 6 ['alreadydone', 'github-actions', 'kckennylau'] nobody
1-32541
1 day ago
1-32702
1 day ago
1-84876
1 day
27092 smorel394
author:smorel394
feat(LinearAlgebra.DirectSum.Finite): a finite direct sum of finite modules is a finite module Prove that a finite direct sum of finite modules is a finite module. There are instances both in the `DFinsupp` and `DirectSum` namespaces, to help type class inference find them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
32/0 Mathlib.lean,Mathlib/LinearAlgebra/DirectSum/Finite.lean 2 3 ['github-actions', 'leanprover-community-bot-assistant', 'smorel394'] nobody
1-31747
1 day ago
2-37597
2 days ago
12-48713
12 days
26704 euprunin
author:euprunin
chore: golf Algebra/ using `aesop` t-algebra
label:t-algebra$
8/29 Mathlib/Algebra/Colimit/Ring.lean,Mathlib/Algebra/GroupWithZero/Regular.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Homology/Embedding/Connect.lean,Mathlib/Algebra/Lie/Ideal.lean,Mathlib/Algebra/Polynomial/Reverse.lean 6 28 ['euprunin', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot'] nobody
1-31433
1 day ago
1-31433
1 day ago
17-74537
17 days
27472 guelmi94
author:guelmi94
feat(Combinatorics/SimpleGraph/Walk): add lemma `support_injective` This contribution was created as part of the Utrecht Summerschool "Formalizing Mathematics in Lean" in July 2025. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-combinatorics 3/0 Mathlib/Combinatorics/SimpleGraph/Walk.lean 1 1 ['github-actions'] nobody
1-30885
1 day ago
1-30888
1 day ago
1-30938
1 day
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 18/0 Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/AlgebraicGeometry/Scheme.lean 2 14 ['Raph-DG', 'erdOne', 'github-actions', 'joelriou', 'ocfnash'] nobody
1-30650
1 day ago
1-30650
1 day ago
33-33374
33 days
26679 robin-carlier
author:robin-carlier
feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): 2-functoriality of `CatCommSqOver` This PR uses the notion of categorical cospan transforms from #26412 and its bicategory-like notations from #26447 to provide API for 2-functoriality of the construction `CatCommSqOver F G X`. We show that `ψ : CatCospanTransform F G F' G'` defines a functor `CatCommSqOver F G X ⥤ CatCommSqOver F' G' X`, and that a functor `U : X ⥤ Y` induces a functor `CatCommSqOver F G Y ⥤ CatCommSqOver F G X` via precomposition. We give the battery of lemma that shows that these constructions are components of a `Cat`-valued "bipseudofunctor", although we cannot state it this way to keep things unbundled and universe polymorphic. --- - [x] depends on: #26447 I apologize in advance, for this one is very boring. As usual, the higher order lemmas are found by aesop_cat and are not marked simp, but I still want to state these explicitly so that in case automation goes wrong, "manual formal bicategory manipulations" remain an option. A design choice was made here. Instead of stating this kind of functoriality for the categorical pullback itself, I chose to state everything in terms of `CatCommSqOver`, i.e in terms of the pseudofunctorial construction corepresented by the categorical pullback. The rationale here is that while we could have done everything only at the level of the categorical pullback itself, I believe this design will allow for easier manipulations of categorical pullback *squares*. Actual bifunctoriality of the categorical pullback (and thus equivalence invariance, which is the key point of the notion compared to the strict pullback) will be in future PRs. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 364/1 Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean 1 4 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robin-carlier'] nobody
1-29912
1 day ago
1-29912
1 day ago
10-63555
10 days
27447 eric-wieser
author:eric-wieser
refactor: rename `Rel` to `Set.Rel`, restore the old `Rel` Many users are confused that Rel no longer means what it used to. Since the design is not obvious, let's put it in a namespace that makes the choice obvious. This then restores the old definition of `Rel`, as an abbrev; it's conceivable that many users were just using this as a shorthand, and this stops them being broken by #25587. Such users will of course be broken if they used [the old API](https://github.com/leanprover-community/mathlib4/blob/59bd63c72671849996d64c5d3b5f24a36333483c%5E/Mathlib/Data/Rel.lean). This way, users bumping from 4.21.0 to 4.22.0 and using `Rel` only as a shorthand will not be broken. [#mathlib4 > Changing `Rel` to `Set (α × β)`, to help uniform spaces @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Changing.20.60Rel.60.20to.20.60Set.20.28.CE.B1.20.C3.97.20.CE.B2.29.60.2C.20to.20help.20uniform.20spaces/near/528531852) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order 134/116 Mathlib/CategoryTheory/Category/RelCat.lean,Mathlib/Combinatorics/Hall/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Data/PFun.lean,Mathlib/Data/Rel.lean,Mathlib/Order/Filter/Partial.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/Rel/GaloisConnection.lean,Mathlib/Order/RelSeries.lean,Mathlib/RingTheory/Length.lean,Mathlib/Topology/Partial.lean,Mathlib/Topology/UniformSpace/Basic.lean 13 3 ['YaelDillies', 'eric-wieser', 'github-actions'] nobody
1-29872
1 day ago
1-46004
1 day ago
1-86358
1 day
25951 themathqueen
author:themathqueen
feat(Analysis/InnerProductSpace/MulOpposite): defines the inner product on opposite spaces This pr defines the inner product on opposite spaces. - [x] depends on: #25949 Motivation for having the inner product structure on the opposite: One application comes up in non-commutative graphs, which are defined on a finite-dimensional C*-algebra with a faithful and positive functional (a Hilbert space structure can be induced by the defined faithful and positive functional (will be added to a pr soon)). For example, we'd need the Hilbert space structure to be defined on the opposite space to define the isomorphism: `(A →ₗ[ℂ] B) ≃ₗ[ℂ] TensorProduct ℂ B Aᵐᵒᵖ`, where `A`, `B` are again finite-dimensional C*-algebras with faithful and positive functionals. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 71/0 Mathlib.lean,Mathlib/Analysis/InnerProductSpace/MulOpposite.lean 2 6 ['github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'themathqueen'] nobody
1-24370
1 day ago
3-41778
3 days ago
20-63290
20 days
27441 judithludwig
author:judithludwig
feat(RingTheory/Polynomial/Quotient): Lemma on PIDs This is part of a course project at Heidelberg University: https://matematiflo.github.io/CompAssistedMath2025/ feat(RingTheory/Polynomial/Quotient): add lemma: Let $$R$$ be an integral domain and assume $$R[X]$$ is a PID, then $$R$$ is a field. This lemma is useful for proving that some rings are not PIDs, such as $$\mathbb{Z}[X]$$. Co-authored-by: Philipp Sivov @Silipp182 Co-authored-by: Veliyan Taslev @hubavelko --- [![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/Polynomial/Quotient.lean 1 3 ['alreadydone', 'github-actions'] nobody
1-20628
1 day ago
2-11614
2 days ago
2-11661
2 days
27484 gasparattila
author:gasparattila
feat(Topology/Semicontinuous): use weaker assumptions for some results Previously, several results about semicontinuity assumed a dense ordering. In `lowerSemicontinuous_iff_isClosed_epigraph`, there was also a completeness requirement on the order, preventing its use with real-valued functions. This PR removes these superfluous assumptions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-topology 47/21 Mathlib/Topology/Semicontinuous.lean 1 1 ['github-actions'] nobody
1-17287
1 day ago
1-17618
1 day ago
1-17665
1 day
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 `liftM 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.toStateM`, `FreeWriter.toWriteT`, `FreeCont.toContT`) derived from the universal property via `liftM` 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 696/0 Mathlib.lean,Mathlib/Control/Monad/Free.lean,Mathlib/Control/Monad/Free/Effects.lean,MathlibTest/freemonad.lean,docs/references.bib 5 145 ['YaelDillies', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'plp127', 'quangvdao', 'tannerduve'] nobody
1-15571
1 day ago
39-29286
1 month ago
49-48369
49 days
26912 pechersky
author:pechersky
chore(Algebra/Ring/Subring): simp tag `Subring.smul_def` s-multiplying by a subtype is easiest to manipulate when both terms are in the ambient type. Many places that had to use the _def lemma for a rewrite, or to include it in a simp set, no longer have to. Ported from #25308 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) I found this being not-simp frustrating when talking about submodules over a valuation subring. maintainer-merge t-algebra
label:t-algebra$
68/67 Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Exact.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Ring/Periodic.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/LinearAlgebra/RootSystem/Irreducible.lean,Mathlib/LinearAlgebra/RootSystem/RootPositive.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/RingTheory/Etale/Kaehler.lean,Mathlib/RingTheory/LocalProperties/Projective.lean,Mathlib/RingTheory/Localization/InvSubmonoid.lean,Mathlib/RingTheory/OreLocalization/Basic.lean 25 16 ['eric-wieser', 'github-actions', 'j-loreaux', 'linesthatinterlace', 'pechersky'] nobody
1-15284
1 day ago
4-8174
4 days ago
15-23049
15 days
26689 euprunin
author:euprunin
chore: golf Combinatorics/ using `grind` t-combinatorics 9/62 Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkCounting.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Trails.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Counting.lean 8 8 ['bryangingechen', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot'] nobody
1-12161
1 day ago
18-85952
18 days ago
23-16396
23 days
27272 eric-wieser
author:eric-wieser
chore: generalize `sumAddHom` to `sumZeroHom` This hopefully will make this usable on quadratic maps, which preserve zero but not addition. For now this does not change the simp-normal form of `sumAddHom` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data maintainer-merge t-algebra
label:t-algebra$
64/24 Mathlib/Data/DFinsupp/BigOperators.lean 1 5 ['YaelDillies', 'eric-wieser', 'github-actions'] nobody
1-8935
1 day ago
1-25832
1 day ago
7-82652
7 days
27492 euprunin
author:euprunin
chore: further golf some previously `grind` golfed proofs Replaces #27431, #27426, #27408 and #27404. It is probably safer to go with local `grind [t1, t2, …]` for now and leave global `@[grind =, etc.] theorem t1 …` annotations for later. I guess the local `grind [t1, t2, …]` uses can help guide which `t1`, `t2`, etc are worth to annotate "globally". bench-after-CI 9/37 Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/RingTheory/DividedPowers/Basic.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean 4 1 ['github-actions'] nobody
1-8693
1 day ago
1-8883
1 day ago
1-8915
1 day
26640 euprunin
author:euprunin
chore: golf Data/ using `grind` t-data 13/96 Mathlib/Data/EReal/Operations.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/Set/Lattice.lean 12 19 ['euprunin', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] nobody
1-8372
1 day ago
1-8372
1 day ago
24-10531
24 days
27400 dleijnse
author:dleijnse
feat: define geometrically reduced algebras Define geometrically reduced algebras, and prove that if all finitely generated subalgebras of an algebra `A` are geometrically reduced, then `A` is geometrically reduced. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
137/0 Mathlib.lean,Mathlib/RingTheory/Nilpotent/GeometricallyReduced.lean 2 23 ['dleijnse', 'github-actions', 'kckennylau'] nobody
1-7257
1 day ago
3-12146
3 days ago
3-12192
3 days
27485 grunweg
author:grunweg
chore: some whitespace fixes Found by the linter in #26926. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 32/32 Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Notation/Lemmas.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Data/Nat/Find.lean,Mathlib/Data/Subtype.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Nontrivial/Defs.lean,Mathlib/Logic/UnivLE.lean,Mathlib/Order/Minimal.lean 11 7 ['JovanGerb', 'adomani', 'eric-wieser', 'github-actions', 'grunweg'] nobody
1-5099
1 day ago
1-17437
1 day ago
1-17421
1 day
27486 grunweg
author:grunweg
chore: add space around `rintro`/`rcases`/`obtain` or-patterns The pretty-printer enforces spaces in or-patterns, e.g. `_|_|x` to `_ | _ | x` (which seems clearly good). I'm on the fence about `(_|_)` --- while `(_ | _)` seems nicer, I'm not sure if I'm really happy with it. `_ | _` could be even nicer when possible. Opinions? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 181/180 Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Algebra/Group/Commute/Units.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Homology/Embedding/Boundary.lean,Mathlib/Algebra/Lie/CartanExists.lean,Mathlib/Algebra/Lie/LieTheorem.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/OrderIso.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/Support.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/AlgebraicTopology/DoldKan/Degeneracies.lean,Mathlib/AlgebraicTopology/DoldKan/FunctorGamma.lean,Mathlib/AlgebraicTopology/DoldKan/Homotopies.lean,Mathlib/AlgebraicTopology/DoldKan/HomotopyEquivalence.lean,Mathlib/AlgebraicTopology/DoldKan/NCompGamma.lean,Mathlib/AlgebraicTopology/DoldKan/Normalized.lean,Mathlib/AlgebraicTopology/DoldKan/Projections.lean,Mathlib/AlgebraicTopology/DoldKan/SplitSimplicialObject.lean,Mathlib/AlgebraicTopology/SimplicialSet/Horn.lean,Mathlib/Analysis/Calculus/LineDeriv/Basic.lean,Mathlib/Analysis/Calculus/LineDeriv/IntegrationByParts.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/Calculus/Rademacher.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Field/Lemmas.lean,Mathlib/Analysis/Normed/Group/Ultra.lean,Mathlib/Analysis/NormedSpace/Connected.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Pow/Asymptotics.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/Extensive.lean,Mathlib/CategoryTheory/Functor/OfSequence.lean,Mathlib/CategoryTheory/Limits/Bicones.lean,Mathlib/CategoryTheory/Limits/Constructions/Over/Products.lean,Mathlib/CategoryTheory/Limits/Final/ParallelPair.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Pullbacks.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/FiniteLimits.lean,Mathlib/CategoryTheory/Limits/Shapes/Multiequalizer.lean,Mathlib/CategoryTheory/Limits/Shapes/WideEqualizers.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/CategoryTheory/Localization/Construction.lean,Mathlib/CategoryTheory/Localization/Pi.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/FunctorCategory.lean,Mathlib/CategoryTheory/Sites/MayerVietorisSquare.lean,Mathlib/Data/Fin/Fin2.lean,Mathlib/Data/Finsupp/Option.lean,Mathlib/Data/Matrix/Basis.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Cast/Order/Ring.lean,Mathlib/Data/Nat/Fib/Basic.lean,Mathlib/FieldTheory/Extension.lean,Mathlib/FieldTheory/KummerPolynomial.lean,Mathlib/FieldTheory/Normal/Basic.lean,Mathlib/Geometry/Manifold/Riemannian/Basic.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Order.lean,Mathlib/MeasureTheory/Function/LpSpace/Complete.lean,Mathlib/MeasureTheory/Group/Measure.lean,Mathlib/MeasureTheory/Integral/BoundedContinuousFunction.lean,Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/Filter/Subsingleton.lean,Mathlib/Probability/Independence/Kernel.lean,Mathlib/RingTheory/AlgebraicIndependent/Transcendental.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/DualNumber.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/Ideal/IsPrimary.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/Lasker.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean,Mathlib/RingTheory/SimpleModule/Basic.lean,Mathlib/RingTheory/Valuation/Integers.lean,Mathlib/Tactic/ComputeDegree.lean,Mathlib/Tactic/NormNum/Prime.lean,Mathlib/Topology/Algebra/InfiniteSum/Group.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Category/LightProfinite/Sequence.lean,Mathlib/Topology/Compactness/HilbertCubeEmbedding.lean,Mathlib/Topology/GDelta/Basic.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/Separation/Basic.lean 103 4 ['JovanGerb', 'adomani', 'b-mehta', 'eric-wieser', 'github-actions'] nobody
1-3812
1 day ago
1-17323
1 day ago
1-17307
1 day
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 5 ['adomani', 'github-actions', 'grunweg', 'leanprover-bot'] nobody
1-2173
1 day ago
33-33757
1 month ago
33-38390
33 days
25945 adomani
author:adomani
feat: the empty line in commands linter This linter flags empty lines within a command. It allows empty lines within doc-strings, module-docs and a couple of other "sensible" places. It also skips files that are likely to contain meta-code, since there the use of empty lines in definition is more widespread. This PR continues the work from #25236. large-import t-linter maintainer-merge 375/7 Mathlib.lean,Mathlib/Analysis/Meromorphic/FactorizedRational.lean,Mathlib/CategoryTheory/Comma/StructuredArrow/CommaMap.lean,Mathlib/Init.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/EmptyLine.lean,MathlibTest/EmptyLine.lean 8 10 ['adomani', 'eric-wieser', 'github-actions'] bryangingechen
assignee:bryangingechen
1-1608
1 day ago
1-2472
1 day ago
40-57384
40 days
27225 eric-wieser
author:eric-wieser
refactor(Tactic/Lift): deprecate the third with argument We already have a number of tactics where the clearing happens all the time, and you have to opt out with `id h`. This also fixes a bug where `lift z to Nat with n hn this_is_unused` would silently ignore `this_is_unused`. --- - [ ] depends on: #27223 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 21/9 Mathlib/Tactic/Lift.lean,MathlibTest/lift.lean 2 5 ['JovanGerb', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'vihdzp'] nobody
1-556
1 day ago
9-1098
9 days ago
9-13579
9 days
27152 xroblot
author:xroblot
feat(RingTheory/Ideal): prove transitivity for the relative norm --- - [x] depends on: #26070 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
150/13 Mathlib/Algebra/Algebra/Tower.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/Ideal/Prime.lean,Mathlib/RingTheory/IntegralClosure/IntegralRestrict.lean,Mathlib/RingTheory/Localization/AtPrime.lean,Mathlib/RingTheory/Localization/FractionRing.lean 6 5 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'riccardobrasca', 'xroblot'] riccardobrasca
assignee:riccardobrasca
0-85268
23 hours ago
11-570
11 days ago
11-11519
11 days
27487 thorimur
author:thorimur
docs: Inherit `Equivalence` docstring on notation The prior docstring for the notation `≌` for `Equivalence` read only > We infix the usual notation for an equivalence This PR instead attaches `@[inherit_doc Equivalence]` to the notation, so that information for `Equivalence` is displayed when hovering over `≌`. We also clean up the formatting and grammar of the docstrings for `Equivalence` and its fields, and make them less "context-specific" (and therefore more appropriate for hovers) without changing their content radically. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 22/14 Mathlib/CategoryTheory/Equivalence.lean 1 6 ['eric-wieser', 'github-actions', 'thorimur'] nobody
0-66179
18 hours ago
1-12901
1 day ago
1-15075
1 day
26726 euprunin
author:euprunin
chore: golf Algebra/ using `grind` t-algebra
label:t-algebra$
46/187 Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/ContinuedFractions/Computation/CorrectnessTerminating.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean,Mathlib/Algebra/ContinuedFractions/Determinant.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/TotalComplexShift.lean,Mathlib/Algebra/IsPrimePow.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MvPolynomial/CommRing.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Order/Antidiag/Nat.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/List.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Algebra/Polynomial/UnitTrinomial.lean,Mathlib/Algebra/QuadraticDiscriminant.lean,Mathlib/Algebra/QuaternionBasis.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/AlgebraicTopology/DoldKan/Homotopies.lean 28 15 ['euprunin', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot'] nobody
0-63027
17 hours ago
1-2129
1 day ago
22-53023
22 days
27166 joelriou
author:joelriou
feat(AlgebraicTopology): the functor `II : SimplexCategory ⥤ SimplexCategoryᵒᵖ` by Gabriel and Zisman In this file, we construct a cosimplicial object `SimplexCategory.II` in `SimplexCategoryᵒᵖ`, i.e. a functor `SimplexCategory ⥤ SimplexCategoryᵒᵖ`. If we identify `SimplexCategory` with the category of finite nonempty linearly ordered types, this functor could be interpreted as the contravariant functor which sends a finite nonempty linearly ordered type `T` to `T →o Fin 2`; in particular, it sends `Fin (n + 1)` to a linearly ordered type which is isomorphic to `Fin (n + 2)`. As a result, we define `SimplexCategory.II` as a functor which sends `⦋n⦌` to `⦋n + 1⦌`: on morphisms, it sends faces to degeneracies and vice versa. (I plan to use this in order to show that the topological realization from simplicial sets to `TopCat` preserves finite limits, following the proof by Gabriel and Zisman.) --- Suggestions for a better (short) name are welcome. `II` is the name given is the original source. - [x] depends on: #27153 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 258/0 Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialObject/II.lean 2 3 ['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot'] nobody
0-61938
17 hours ago
10-58571
10 days ago
10-58563
10 days
27501 wwylele
author:wwylele
feat(Algebra/Order): additional lemma about mkRat pos/neg There is `mkRat_nonneg` in the same file. This adds iff version for all pos/neg/nonpos/nonneg --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-algebra
label:t-algebra$
12/0 Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean 1 2 ['Ruben-VandeVelde', 'github-actions'] nobody
0-59110
16 hours ago
0-59110
16 hours ago
0-73411
20 hours
27055 wwylele
author:wwylele
feat(RingTheory): add HahnSeries.truncate --- This is for the proof of Hahn embedding theorem #27043, but it feels niche to have it in HahnSeries file, so I am not sure... if this doesn't feel right, I could make them private to the proof. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-algebra
label:t-algebra$
31/0 Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Basic.lean 2 3 ['Ruben-VandeVelde', 'ScottCarnahan', 'github-actions'] nobody
0-58991
16 hours ago
0-58991
16 hours ago
13-73485
13 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/) maintainer-merge t-topology 9/0 Mathlib/Topology/Algebra/UniformRing.lean 1 2 ['Ruben-VandeVelde', 'github-actions'] nobody
0-58851
16 hours ago
0-58851
16 hours ago
73-60258
73 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/) maintainer-merge 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 2 ['Ruben-VandeVelde', 'github-actions'] nobody
0-58712
16 hours ago
0-58712
16 hours ago
57-1310
57 days
25182 YaelDillies
author:YaelDillies
feat: `(M →* N₁) ≃* (M →* N₂)` if `N₁ ≃* N₂` The names were discussed on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Naming.20congruence.20of.20maps) but no consensus was reached due to lack of engagement. The names I choose here are consistent with [`ContinuousLinearEquiv.continuousAlternatingMapCongrLeft`](https://leanprover-community.github.io/mathlib4_docs/find/?pattern=ContinuousLinearEquiv.continuousAlternatingMapCongrLeft#doc) and around. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-algebra
label:t-algebra$
116/18 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 20 ['YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions'] eric-wieser
assignee:eric-wieser
0-56135
15 hours ago
2-25352
2 days ago
60-16614
60 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 ∈ 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 311/30 Mathlib.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/Nucleus.lean,Mathlib/Order/Sublocale.lean,Mathlib/Order/Synonym.lean,docs/references.bib 6 76 ['Bergschaf', 'YaelDillies', 'b-mehta', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'xhalo32'] bryangingechen
assignee:bryangingechen
0-52653
14 hours ago
49-12104
1 month ago
62-77926
62 days
27502 grunweg
author:grunweg
chore: more indentation fixes Found by the linter in #27473. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 180/193 Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Azumaya/Defs.lean,Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/Grp/Limits.lean,Mathlib/Algebra/Category/GrpWithZero.lean,Mathlib/Algebra/Category/ModuleCat/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Basic.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Basic.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/EnoughProjectives.lean,Mathlib/Algebra/Homology/ShortComplex/HomologicalComplex.lean,Mathlib/Algebra/Homology/ShortComplex/Homology.lean,Mathlib/Algebra/Homology/ShortComplex/LeftHomology.lean,Mathlib/Algebra/Homology/ShortComplex/Preadditive.lean,Mathlib/Algebra/Homology/ShortComplex/PreservesHomology.lean,Mathlib/Algebra/Homology/ShortComplex/RightHomology.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/CategoryTheory/Adjunction/Reflective.lean,Mathlib/CategoryTheory/GradedObject.lean,Mathlib/CategoryTheory/GradedObject/Bifunctor.lean,Mathlib/CategoryTheory/GradedObject/Trifunctor.lean,Mathlib/CategoryTheory/Limits/Preserves/Basic.lean,Mathlib/CategoryTheory/Linear/LinearFunctor.lean,Mathlib/CategoryTheory/Monoidal/Comon_.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean,Mathlib/CategoryTheory/Preadditive/LeftExact.lean,Mathlib/CategoryTheory/Shift/Basic.lean,Mathlib/CategoryTheory/Subterminal.lean,Mathlib/CategoryTheory/WithTerminal/Cone.lean,Mathlib/Data/Finsupp/SMulWithZero.lean,Mathlib/Data/Fintype/Powerset.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/Data/Matrix/Composition.lean,Mathlib/Data/Set/Card.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/LinearAlgebra/BilinearMap.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/Order/Category/BddDistLat.lean,Mathlib/Order/Category/BddOrd.lean,Mathlib/Order/Category/BoolAlg.lean,Mathlib/Order/Category/DistLat.lean,Mathlib/Order/Category/FinPartOrd.lean,Mathlib/Order/Category/HeytAlg.lean,Mathlib/Order/Category/Lat.lean,Mathlib/Order/Category/PartOrd.lean,Mathlib/Order/RelSeries.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/SetTheory/Cardinal/ENat.lean,Mathlib/Topology/Category/TopCat/Basic.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/DiscreteSubset.lean,Mathlib/Topology/Homeomorph/Defs.lean 68 1 ['github-actions'] nobody
0-52436
14 hours ago
0-52515
14 hours ago
0-52499
14 hours
23181 YaelDillies
author:YaelDillies
refactor(Topology/UniformSpace): use `Rel` What's left in `UniformSpace.Defs` is precisely the theory of the uniformity filter. The motivation is that the theory of coverings and packings in both high dimensional probability and dynamics can be based on entourages, while they have little to do with the uniformity filter (indeed, entourages are in a sense a quantitative version of the uniformity filter). --- - [x] depends on: #25587 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 787/608 Mathlib/Data/Rel.lean,Mathlib/Dynamics/TopologicalEntropy/CoverEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Dynamics/TopologicalEntropy/NetEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/Semiconj.lean,Mathlib/Dynamics/TopologicalEntropy/Subset.lean,Mathlib/InformationTheory/Hamming.lean,Mathlib/MeasureTheory/Measure/RegularityCompacts.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/MetricSpace/PiNat.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/UniformSpace/Ascoli.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Cauchy.lean,Mathlib/Topology/UniformSpace/Compact.lean,Mathlib/Topology/UniformSpace/CompactConvergence.lean,Mathlib/Topology/UniformSpace/Completion.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/DiscreteUniformity.lean,Mathlib/Topology/UniformSpace/Equicontinuity.lean,Mathlib/Topology/UniformSpace/HeineCantor.lean,Mathlib/Topology/UniformSpace/OfCompactT2.lean,Mathlib/Topology/UniformSpace/OfFun.lean,Mathlib/Topology/UniformSpace/Separation.lean,Mathlib/Topology/UniformSpace/Ultra/Basic.lean,Mathlib/Topology/UniformSpace/Ultra/Constructions.lean,Mathlib/Topology/UniformSpace/UniformApproximation.lean,Mathlib/Topology/UniformSpace/UniformConvergence.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean 29 28 ['ADedecker', 'PatrickMassot', 'YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
0-51524
14 hours ago
1-37451
1 day ago
58-51119
58 days
27497 ScottCarnahan
author:ScottCarnahan
feat(RingTheory/PowerSeries/Binomial): add basic lemmas, golf This PR adds two simp lemmas for binomial power series, and generalizes the hypotheses of `binomialSeries_nat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
17/19 Mathlib/RingTheory/PowerSeries/Binomial.lean 1 3 ['ScottCarnahan', 'github-actions', 'wwylele'] nobody
0-45269
12 hours ago
0-82074
22 hours ago
0-82070
22 hours
26660 strihanje01
author:strihanje01
feat(Combinatorics/Additive/VerySmallDoubling): weak non-commutative Kneser's theorem add theorem about the structure of a doubling smaller than the golden ratio --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import new-contributor t-combinatorics 430/5 Mathlib/Combinatorics/Additive/VerySmallDoubling.lean 1 61 ['YaelDillies', 'github-actions', 'strihanje01'] nobody
0-34698
9 hours ago
15-15416
15 days ago
20-65637
20 days
27496 bwangpj
author:bwangpj
feat(Topology/Instances/Matrix): topology of `Set.matrix` Prove topological results (`IsOpen`, `IsCompact`) about `Set.matrix`. - [x] depends on: #27190 [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/Set.2Ematrix/near/527826651) Co-authored-by: Kevin Buzzard --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 25/0 Mathlib/Data/Matrix/Defs.lean,Mathlib/Topology/Instances/Matrix.lean 2 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
0-31152
8 hours ago
0-31723
8 hours ago
0-35180
9 hours
27304 jano-wol
author:jano-wol
feat: invariant dual submodules define Lie ideals Invariant dual submodules define Lie ideals --- PR shows that Invariant dual submodules define Lie ideals. This work is part of the framework: https://github.com/orgs/leanprover-community/projects/17 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
702/0 Mathlib.lean,Mathlib/Algebra/Lie/Weights/InvariantSubmoduleLieIdeal.lean,Mathlib/Algebra/Lie/Weights/Killing.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean 4 1 ['github-actions'] nobody
0-29637
8 hours ago
6-41069
6 days ago
6-41116
6 days
27508 chrisflav
author:chrisflav
feat(RingTheory): height under ring homomorphism We show that if `P` lies over `p`, the height of `P` is bounded by the height of `p` plus the height of the image of `P` in `S ⧸ p S`. In a follow-up PR, we show that equality holds if `S` satisfies going-down as an `R`-algebra. Co-authored by: Sihan Su Co-authored by: Yi Song --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-algebra
label:t-algebra$
120/1 Mathlib/Data/Finset/Card.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Basic.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean 7 1 ['github-actions'] nobody
0-27990
7 hours ago
0-33282
9 hours ago
0-33266
9 hours
26757 fweth
author:fweth
feat(CategoryTheory/Topos): define elementary topos This commit begins the formalization of the notion of an *elementary topos*, following the definition in \[Mac Lane & Moerdijk, *Sheaves in Geometry and Logic* (1992), Ch. IV, Section 1]. It introduces the file `Mathlib/CategoryTheory/Topos/Basic.lean`, which currently includes: * The definition of an elementary topos. * Proof that the power object map is a functor * Theorem about pullbacks of characterstic maps Subobject classifiers, which are used in the definition, have already been defined in `CategoryTheory/Topos/Classifier.lean` Work in progress: further formalization of the section is planned. Questions: * Should the definition of power objects be separated into its own file/module, perhaps under `CategoryTheory/Topos/PowerObject.lean`? * Is the notation `P` / `P_morph` / `P_functor` for the power object functor on objects / morphisms / total acceptable? * Should the comments and docstrings rather use the notation from the book, where `g ∘ f` denotes arrow composition from righ to left, or the Lean variant `f ≫ g`? Klaus Gy klausgy@gmail.com --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-category-theory 262/72 Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Equalizer.lean,Mathlib/CategoryTheory/Topos/Basic.lean,Mathlib/CategoryTheory/Topos/Classifier.lean 6 5 ['fweth', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant'] nobody
0-26893
7 hours ago
0-37320
10 hours ago
17-77468
17 days
26270 vasnesterov
author:vasnesterov
chore(Analysis/Analytic): split `Analytic.Basic` Move the results on the radius of convergence from `Analytic/Basic.lean` to a new file `Analytic/ConvergenceRadius.lean`. --- - [x] depends on: #26255 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 450/431 Mathlib.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/ConvergenceRadius.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Analytic/RadiusLiminf.lean 5 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
0-25795
7 hours ago
0-30117
8 hours ago
0-30647
8 hours
27498 Komyyy
author:Komyyy
feat: Group isomorphisms between (`Equiv.Perm`|`alternatingGroup`)s 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$
29/0 Mathlib/Algebra/Group/End.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean 2 1 ['github-actions'] nobody
0-22364
6 hours ago
0-81519
22 hours ago
0-81505
22 hours
27509 bjornsolheim
author:bjornsolheim
feat (Geometry/Convex/Cone): add conical hull and cone tensor products Add three new files: **AppendLemmas** (`Geometry/Convex/Cone/AppendLemmas.lean`): - Prove lemmas for appending/de-appending finite sequences **ConicalHull** (`Geometry/Convex/Cone/ConicalHull.lean`): - Prove closure properties of sequences with nonnegative coefficients - Define conical hull - Prove that the smallest pointed cone containing s is the conical hull of s **TensorProduct** (`Geometry/Convex/Cone/TensorProduct.lean`): - Define minimal and maximal tensor products of cones - Prove that min tensor product ≤ max tensor product Tensor products of ordered modules don't have a unique ordering. Natural choices are bounded by the minimal and maximal tensor products of cones. t-convex-geometry new-contributor 469/0 Mathlib.lean,Mathlib/Geometry/Convex/Cone/AppendLemmas.lean,Mathlib/Geometry/Convex/Cone/ConicalHull.lean,Mathlib/Geometry/Convex/Cone/TensorProduct.lean 4 3 ['YaelDillies', 'bjornsolheim', 'github-actions'] nobody
0-20785
5 hours ago
0-37521
10 hours ago
0-37571
10 hours
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/) infinity-cosmos t-category-theory 50/15 Mathlib/CategoryTheory/Category/Preorder.lean 1 12 ['github-actions', 'joelriou', 'robin-carlier', 'thorimur'] robin-carlier
assignee:robin-carlier
0-20745
5 hours ago
0-20745
5 hours ago
25-74562
25 days
26844 kebekus
author:kebekus
feat: establish examples of harmonic functions If `f : ℂ → F` is complex-differentiable, then show that `f` is harmonic. If `F = ℂ`, then so is its real part, imaginary part, and complex conjugate. If `f` has no zero, then `log ‖f‖` is harmonic. This material is used in [Project VD](https://github.com/kebekus/ProjectVD), which aims to formalize Value Distribution Theory for meromorphic functions on the complex plane. It is one of the ingredients in the proof of Jensen's Formula in complex analysis. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 128/0 Mathlib.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/InnerProductSpace/Harmonic/Constructions.lean 3 12 ['github-actions', 'grunweg', 'kebekus', 'sgouezel'] nobody
0-19356
5 hours ago
19-52081
19 days ago
19-52130
19 days
26839 kebekus
author:kebekus
feat: implement the Cauchy-Riemann Equation Describe complex differentiability for functions `f : ℂ → ℂ` using the Cauchy-Riemann equation. This material closes a long-standing open TODO. It is used in [Project VD](https://github.com/kebekus/ProjectVD), which aims to formalize Value Distribution Theory for meromorphic functions on the complex plane. It is one of the ingredients in the proof of Jensen's Formula in complex analysis. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 175/10 Mathlib/Analysis/Complex/Conformal.lean 1 76 ['YaelDillies', 'github-actions', 'grunweg', 'kebekus', 'sgouezel', 'themathqueen'] nobody
0-18462
5 hours ago
0-18504
5 hours ago
16-5709
16 days
27516 gaetanserre
author:gaetanserre
feat: add rational approximation lemma for suprema in `unitInterval` Add `sSup_eq_iUnion_rat` lemma that provides a rational approximation characterization of suprema in the unit interval. For monotone functions `f : α → I → ℝ`, the lemma establishes that the set of pairs where `a < sSup {x | f e.1 x < e.2}` equals the union over all rationals `q ∈ I` with `q > a` of the sets `{e | f e.1 q < e.2}`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 21/0 Mathlib/Topology/UnitInterval.lean 1 1 ['github-actions'] nobody
0-17820
4 hours ago
0-21899
6 hours ago
0-21945
6 hours
27515 gaetanserre
author:gaetanserre
feat: `ProbabilityTheory.cdf_eq_real` for measure on `unitInterval` Given a probability measure `μ` on `I`, the CDF of the pushforward of `μ` along `Subtype.val` is equal to the measure of the closed interval. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-measure-probability 9/0 Mathlib/Probability/CDF.lean 1 1 ['github-actions'] nobody
0-17797
4 hours ago
0-23463
6 hours ago
0-23509
6 hours
27517 gaetanserre
author:gaetanserre
feat: a `MeasurableEmbedding` has a measurable left inverse Definition of the measurable left inverse of a `MeasurableEmbedding`. Co-authored-by: Rémy Degenne --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-measure-probability 29/0 Mathlib/MeasureTheory/MeasurableSpace/Embedding.lean 1 1 ['github-actions'] nobody
0-17603
4 hours ago
0-21224
5 hours ago
0-21270
5 hours
27270 EtienneC30
author:EtienneC30
chore: turn WithLp into a structure Turn `WithLp` into a one field structure, as was suggested many times on Zulip and discussed here: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/defeq.20abuse.20in.20.60WithLp.60/near/526234806. Here is what this PR does: - The instances on `WithLp p α` which were defeq to those on `α` (algebraic instances, topology, uniformity, bornology) are now pulled back from `α` along `WithLp.equiv p α`. A few declarations are added to ease the process, such as versions of `WithLp.equiv` as a homeomorphism or a uniform isomorphism. - It introduces some definitions to equip `α × β` with the Lp distance, and similarly for `Π i, α i`. This is then used to define relevant instances on type synonyms, such as for matrix norms. - The PR fixes all the defeq abuses (which break obviously). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-analysis 733/407 Archive/Hairer.lean,Mathlib.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Analysis/Analytic/WithLp.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Calculus/ContDiff/WithLp.lean,Mathlib/Analysis/Calculus/FDeriv/WithLp.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/ProdL2.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/Normed/Algebra/UnitizationL1.lean,Mathlib/Analysis/Normed/Lp/LpEquiv.lean,Mathlib/Analysis/Normed/Lp/MeasurableSpace.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/Analysis/RCLike/Inner.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Geometry/Manifold/Instances/Icc.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/Spectrum.lean,Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean,Mathlib/MeasureTheory/Measure/Haar/OfBasis.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/NumberTheory/NumberField/Ideal/Asymptotics.lean 31 2 ['github-actions', 'leanprover-community-bot-assistant'] nobody
0-14013
3 hours ago
0-14412
3 hours ago
7-79256
7 days
26836 mans0954
author:mans0954
feat(Order/Lattice): conditions for an equivalence relation to be a lattice congruence Define a structure asserting that a binary relation is a lattice congruence and provide sufficient and necessary conditions. An application is given in #26983 --- - [x] depends on: #27219 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-order 114/0 Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/Lattice.lean,docs/references.bib 3 20 ['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mans0954', 'mathlib4-dependent-issues-bot'] nobody
0-13629
3 hours ago
9-9481
9 days ago
17-72016
17 days
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
0-13591
3 hours ago
32-55876
1 month ago
32-55919
32 days
25907 mans0954
author:mans0954
Low order roots of unity This PR continues the work from #25470. Original PR: https://github.com/leanprover-community/mathlib4/pull/25470 t-algebra
label:t-algebra$
182/0 Mathlib/Algebra/CharP/Invertible.lean,Mathlib/RingTheory/RootsOfUnity/Complex.lean 2 2 ['github-actions', 'mans0954'] nobody
0-13537
3 hours ago
41-38943
1 month ago
41-38993
41 days
25905 mans0954
author:mans0954
feat(RingTheory/Polynomial/SmallDegreeVieta): polynomial versions of results in Algebra.QuadraticDiscriminant This PR continues the work from #25605. Original PR: https://github.com/leanprover-community/mathlib4/pull/25605 t-algebra
label:t-algebra$
73/8 Mathlib/RingTheory/Polynomial/SmallDegreeVieta.lean 1 31 ['github-actions', 'kckennylau', 'mans0954'] nobody
0-13508
3 hours ago
41-39396
1 month ago
41-39440
41 days
27437 kckennylau
author:kckennylau
feat(RingTheory/Valuation): some lemmas about comparing with 1 and 0 and with each other *From the 2025 Local Class Field Theory Workshop.* --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
109/22 Mathlib/NumberTheory/Padics/ValuativeRel.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Extension.lean,Mathlib/RingTheory/Valuation/ValuativeRel.lean 4 18 ['erdOne', 'github-actions', 'kckennylau', 'matthewjasper', 'pechersky'] nobody
0-11930
3 hours ago
2-24254
2 days ago
2-24297
2 days
27016 Komyyy
author:Komyyy
feat: `⋃ x ∈ s ×ˢ t, f x.1 ×ˢ g x.2 = (⋃ x ∈ s, f x) ×ˢ (⋃ x ∈ t, g x)` etc. This lemma is needed to prove that finite product of Alexandrov-discrete spaces is Alexandrov-discrete: #27018 This is the generalization of [Set.iUnion_prod](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Data/Set/Lattice/Image.html#Set.iUnion_prod) to `biUnion`. Also generalize pi version. Also generalize the type of the lemma ```lean `⋃ (i : ι), ⋃ j, ⋃ (i' : ι), ⋃ j', s i j i' j' = ⋃ (i' : ι), ⋃ j', ⋃ (i : ι), ⋃ j, s i j i' j'` ``` to ```lean `⋃ (i : ι), ⋃ j, ⋃ (i' : ι'), ⋃ j', s i j i' j' = ⋃ (i' : ι'), ⋃ j', ⋃ (i : ι), ⋃ j, s i j i' j'` ``` --- Caution: The generalization of this lemma to `⋂` is not easy because it requires nonempty. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-set-theory maintainer-merge 19/4 Mathlib/Data/Set/Lattice.lean,Mathlib/Data/Set/Lattice/Image.lean 2 2 ['Ruben-VandeVelde', 'github-actions'] nobody
0-11467
3 hours ago
0-11467
3 hours ago
14-71674
14 days
26851 oliver-butterley
author:oliver-butterley
feat(Mathlib/Algebra/Order): add 3 lemmas related to `partialSups` Add 3 lemmas related to `partialSups`: - One concerns the partialSup of a function with a constant added - Two concern the partialSup of the succ, both of which are natural variants of the other lemma already mathlib. The lemmas couldn't be added to any of the files which already contain similar results on `partialSups` because in each case it would significantly increase imports. Co-authored-by: Lua Viana Reis --- Are these lemmas correctly located? Another option would be to have a folder `PartialSups` containing multiple files with the different lemmas. - [x] depends on: #26848 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-order 58/0 Mathlib.lean,Mathlib/Algebra/Order/AddGroup/PartialSups.lean,Mathlib/Algebra/Order/SuccOrder/PartialSups.lean 3 4 ['Ruben-VandeVelde', 'github-actions', 'mathlib4-dependent-issues-bot'] nobody
0-10842
3 hours ago
0-10842
3 hours ago
12-36564
12 days
27289 kckennylau
author:kckennylau
feat(FieldTheory): lemmas about trace and norm in finite fields --- Zulip: [#new members > How to formalize a finite field exercise?](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/How.20to.20formalize.20a.20finite.20field.20exercise.3F/with/529553211) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-algebra
label:t-algebra$
41/4 Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Finite/Trace.lean 2 2 ['Ruben-VandeVelde', 'github-actions'] nobody
0-10178
2 hours ago
0-10178
2 hours ago
7-38291
7 days
25952 101damnations
author:101damnations
feat(RepresentationTheory/Homological/GroupHomology/Functoriality): the degree 1 part of the corestriction-coinflation exact sequence when the subgroup acts trivially Given a normal subgroup `S` of `G` and a `G`-representation `A` on which `S` acts trivially, this PR defines the short complex `H₁(S, A) ⟶ H₁(G, A) ⟶ H₁(G ⧸ S, A)` induced by the natural inclusion `S → G` and projection `G → G / S`. We show it is exact and that the righthand map is an epimorphism. --- - [x] depends on: #21652 - [x] depends on: #21732 - [x] depends on: #21733 - [x] depends on: #21735 - [x] depends on: #21736 - [x] depends on: #21738 - [x] depends on: #25868 - [x] depends on: #25873 - [x] depends on: #25880 - [x] depends on: #25884 - [x] depends on: #25888 - [x] depends on: #25939 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *Earlier version at #22654* t-algebra
label:t-algebra$
138/0 Mathlib/RepresentationTheory/Homological/GroupHomology/Functoriality.lean 1 n/a ['github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
0-8048
2 hours ago
unknown
unknown
27361 101damnations
author:101damnations
feat(Algebra/Homology/AlternatingConst): generalize to any appropriate complex shape and pair of maps Given an object `X : C` and endomorphisms `φ, ψ : X ⟶ X` such that `φ ∘ ψ = ψ ∘ φ = 0`, this PR defines the periodic chain and cochain complexes `... ⟶ X --φ--> X --ψ--> X --φ--> X --ψ--> 0` and `0 ⟶ X --ψ--> X --φ--> X --ψ--> X --φ--> ...` (or more generally for any complex shape `c` on `ℕ` where `c.Rel i j` implies `i` and `j` have different parity). We calculate the homology of these periodic complexes. This generalizes some of the current content of the file, which works for the chain complex where `ψ = 0` and `φ = Id`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-algebra
label:t-algebra$
129/13 Mathlib/Algebra/Homology/AlternatingConst.lean 1 3 ['github-actions', 'kbuzzard'] nobody
0-7770
2 hours ago
0-7770
2 hours ago
4-4284
4 days
27362 101damnations
author:101damnations
feat(RepresentationTheory): add the norm map Given a representation `A` of a finite group `G`, `A.norm` is the representation morphism `A ⟶ A` defined by `x ↦ ∑ A.ρ g x` for `g` in `G`. We define this and prove related lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-algebra
label:t-algebra$
154/0 Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Rep.lean 3 4 ['github-actions', 'kbuzzard'] nobody
0-7480
2 hours ago
0-7480
2 hours ago
4-4150
4 days
27511 Nebula691
author:Nebula691
feat(Algebra/QuadraticAlgebra) : Define Quadratic Algebra co-authored-by : Edison Xie co-authored-by : Kenny Lau --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
445/0 Mathlib.lean,Mathlib/Algebra/QuadraticAlgebra.lean 2 25 ['Whysoserioushah', 'github-actions', 'kckennylau'] nobody
0-6705
1 hour ago
0-27793
7 hours ago
0-27839
7 hours
27520 chrisflav
author:chrisflav
feat(Module/SpanRank): add various lemmas Add `spanFinrank` versions of `spanRank` lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
22/0 Mathlib/Algebra/Module/SpanRank.lean 1 1 ['github-actions'] nobody
0-5344
1 hour ago
0-5412
1 hour ago
0-5397
1 hour
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/) maintainer-merge 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 5 ['Ruben-VandeVelde', 'github-actions', 'j-loreaux', 'tb65536'] nobody
0-4682
1 hour ago
0-4682
1 hour ago
39-29837
39 days
26694 BoltonBailey
author:BoltonBailey
feat: add lemmas for modular exponentiation with the totient function This PR adds lemmas around reducing the exponent of a modular exponentiation. These lemmas were found while doing work for [Project Numina](https://projectnumina.ai/). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data maintainer-merge 52/0 Mathlib.lean,Mathlib/Data/Nat/PowModTotient.lean 2 3 ['Ruben-VandeVelde', 'github-actions'] nobody
0-4528
1 hour ago
0-11997
3 hours ago
23-18078
23 days
27076 Komyyy
author:Komyyy
refactor: don't require `DecidablePred` to state `PrimrecPred` ```lean def PrimrecPred {α} [Primcodable α] (p : α → Prop) [DecidablePred p] := Primrec fun a => decide (p a) ``` Currently, `DecidablePred` is required to **state** `PrimrecPred`, so this PR changes the definition and adds convenient APIs for this new definition: ```lean def PrimrecPred {α} [Primcodable α] (p : α → Prop) := open scoped Classical in Primrec fun a => decide (p a) ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-computability 117/67 Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/Primrec.lean,Mathlib/Computability/Reduce.lean 4 5 ['Komyyy', 'digama0', 'eric-wieser', 'github-actions'] nobody
0-3026
50 minutes ago
13-27503
13 days ago
13-27489
13 days
27522 euprunin
author:euprunin
chore(Algebra/Category/ModuleCat): remove use of `erw` in `coconeMorphism` t-algebra
label:t-algebra$
1/1 Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean 1 1 ['github-actions'] nobody
0-2618
43 minutes ago
0-3311
54 minutes ago
0-3356
55 minutes
27523 euprunin
author:euprunin
chore(CategoryTheory/Idempotents): remove use of `erw` in `split_iff_of_iso` t-category-theory 1/3 Mathlib/CategoryTheory/Idempotents/Basic.lean 1 1 ['github-actions'] nobody
0-2204
36 minutes ago
0-2211
36 minutes ago
0-2257
37 minutes
27524 euprunin
author:euprunin
chore(CategoryTheory/Localization): remove use of `erw` in `homMap_map` t-category-theory 0/1 Mathlib/CategoryTheory/Localization/HomEquiv.lean 1 1 ['github-actions'] nobody
0-1934
32 minutes ago
0-1941
32 minutes ago
0-1986
33 minutes
27178 artie2000
author:artie2000
feat(Algebra/Order/Ring): make `IsOrderedRing.toStrictOrderedRing` an instance Requiring `IsStrictOrderedRing` on a `Field` is a footgun (the current instances come from a find and replace on `LinearOrderedField`). Weakening typeclasses can incur a performance hit so will be done where appropriate in future PRs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
1/1 Mathlib/Algebra/Order/Ring/Defs.lean 1 5 ['YaelDillies', 'github-actions', 'j-loreaux', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] nobody
0-1856
30 minutes ago
10-85641
10 days ago
11-11928
11 days

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
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
65-79421
2 months ago
93-76978
3 months ago
93-77030
93 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
60-7851
1 month ago
60-85663
1 month ago
60-85718
60 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
59-54119
1 month ago
60-30061
1 month ago
66-34455
66 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
38-4752
1 month ago
42-36551
1 month ago
42-36596
42 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
36-54132
1 month ago
37-35149
1 month ago
37-35198
37 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
33-34432
1 month ago
33-34442
1 month ago
33-34487
33 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
29-32581
29 days ago
30-16439
1 month ago
30-16485
30 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
28-79624
28 days ago
28-79624
28 days ago
31-2500
31 days
26462 PSchwahn
author:PSchwahn
feat(LinearAlgebra/Projection): add results about inverse of `Submodule.prodEquivOfIsCompl` Add two theorems `Submodule.prodEquivOfIsCompl_symm_apply` and `Submodule.prodEquivOfIsCompl_symm_add`, which are API for `Submodule.prodEquivOfIsCompl`. We believe these theorems are useful; for example, we have used their statements in a [classification formalization project](https://github.com/LieLean/LowDimSolvClassification). 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
27-86191
27 days ago
29-71825
29 days ago
29-71951
29 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
24-14081
24 days ago
24-14081
24 days ago
24-15685
24 days
23986 ShouxinZhang
author:ShouxinZhang
feat(FieldTheory/RatFunc): add RatFunc.toFractionRingAlgEquiv --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 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
23-81189
23 days ago
26-7645
26 days ago
104-70584
104 days
26710 metakunt
author:metakunt
feat (Data/Nat/Digits/Lemmas): Add digits_getD Adds digits_getD, an explicit computation of the i-th digits of n in base b representation. t-data new-contributor 64/0 Mathlib/Data/Nat/Digits/Lemmas.lean 1 1 ['github-actions'] nobody
22-83136
22 days ago
22-83267
22 days ago
22-83320
22 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 documentation
label:t-algebra$
3/3 Mathlib/LinearAlgebra/BilinearForm/Orthogonal.lean 1 2 ['github-actions', 'mbkybky'] nobody
22-59290
22 days ago
22-59297
22 days ago
25-11765
25 days
26785 TOMILO87
author:TOMILO87
feat: beta distribution Add the Beta distribution to the probability distributions in mathlib4. This implementation includes: - Definition of the Beta function over the reals - The probability density function (PDF) of the Beta distribution - Proof that the PDF integrates to 1 - The corresponding `Measure` and CDF - Lemmas about measurability, positivity, and integrability The Beta distribution is a family of continuous probability distributions defined on the interval [0, 1], parametrized by two positive shape parameters, `α` and `β`, that control the shape of the distribution. This follows the general structure of other distributions in mathlib, such as the Gamma distribution. --- This is a clean version of the PR originally opened as [#25608](https://github.com/leanprover-community/mathlib4/pull/25608) and temporarily migrated in [#26325](https://github.com/leanprover-community/mathlib4/pull/26325). It includes: - `456da1c`: Initial version of the distribution - `c047aee`: Address review comments from @EtienneC30 - `f165c79`: Remove `ae` condition from `lintegral_betaPDF_eq` - `7875f47`: Lint fix for unused simp args This PR is rebased onto `master` and follows the fork-based workflow. Thanks for your helpful comments earlier! new-contributor t-measure-probability 285/0 Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Probability/Distributions/Beta.lean 3 1 ['github-actions'] nobody
19-55668
19 days ago
19-55668
19 days ago
21-32525
21 days
26765 KiringYJ
author:KiringYJ
feat(MeasureTheory/PiSystem): add π-λ theorem and SetLike instance Add two small features to `MeasureTheory/PiSystem`: 1. SetLike instance `instance : SetLike (DynkinSystem α) (Set α)` This lets us write `s ⊆ d` and `t ∈ d` for a DynkinSystem `d`, matching usual mathlib style. 2. `DynkinSystem.pi_lambda` lemma Classical π‑λ theorem: if a π‑system `s` is contained in a Dynkin system `d`, every set measurable for `σ(s)` is also in `d`. Currently, mathlib exposes this result only indirectly (e.g. via `generateFrom_eq`). Although logically equivalent, it is not obvious at first glance that those lemmas are the π‑λ theorem. The new lemma states the result in its familiar textbook form, so users can recognise and cite it immediately. Both pieces are under 10 lines, term‑mode only, and do not modify existing APIs. No breaking changes. No dependencies. new-contributor t-measure-probability easy 13/0 Mathlib/MeasureTheory/PiSystem.lean 1 10 ['KiringYJ', 'github-actions', 'ocfnash'] nobody
19-33666
19 days ago
19-56919
19 days ago
22-17375
22 days
26790 FlAmmmmING
author:FlAmmmmING
feat(Combinatorics/Enumerative/Bell.lean): define standard Bell number --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-combinatorics 38/1 Mathlib/Combinatorics/Enumerative/Bell.lean 1 11 ['AntoineChambert-Loir', 'FlAmmmmING', 'eric-wieser', 'github-actions', 'kckennylau', 'madvorak'] nobody
19-28633
19 days ago
21-25295
21 days ago
21-25342
21 days
26909 gasparattila
author:gasparattila
feat(LinearAlgebra/Projectivization/Subspace): correspondence between linear and projective subspaces --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
51/3 Mathlib/LinearAlgebra/Projectivization/Subspace.lean 1 1 ['github-actions'] nobody
18-11088
18 days ago
18-11094
18 days ago
18-11143
18 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 365/0 Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean 3 7 ['YaelDillies', 'agjftucker', 'github-actions', 'igorkhavkine', 'mathlib4-dependent-issues-bot'] nobody
18-2294
18 days ago
30-54302
1 month ago
31-40041
31 days
26814 KiringYJ
author:KiringYJ
feat(MeasureTheory): expose `m.SigmaAlgebra` and `IsSigmaAlgebra` (New PR opened because I mis-clicked “Merge” on the previous branch and had to revert it.) This PR introduces a lightweight API for treating the σ‑algebra of a `MeasurableSpace` as a plain `Set (Set α)`, plus a semantic predicate `IsSigmaAlgebra` and small bridges between bundled and un‑bundled views. #### Motivation The immediate goal is to prepare for a formalization of the **monotone class theorem**. With `m.SigmaAlgebra` and the `IsSigmaAlgebra` predicate, one can state the theorem as a clean equality of families of sets, e.g. ```lean SigmaAlgebra.generateFrom G = MonotoneClass.generateFrom G ``` rather than the more cumbersome phrasing "`s` is measurable ↔ `s` belongs to the smallest monotone class containing `G`". The helpers in this PR make those equalities ergonomic and reusable. #### What’s new - **`m.SigmaAlgebra`** – the collection of all `m`‑measurable sets, exposed as a value of type `Set (Set α)`. Lets you write `s ∈ m.SigmaAlgebra` instead of `MeasurableSet[m] s`. - **`IsSigmaAlgebra F`** – predicate saying that a family of sets `A` is already a σ‑algebra, defined by `(generateFrom F).SigmaAlgebra = F`. - **`generateFrom_sigmaAlgebra_eq`** – idempotence lemma `generateFrom m.SigmaAlgebra = m` (`@[simp]`). - Boolean‑algebra instance on `m.SigmaAlgebra` (alias of the existing subtype instance). - Helper lemmas: - `Subtype.mem_sigma` – bundled measurable set ∈ `m.SigmaAlgebra`. - `Set.toMeasurableSubtype` – wrap a membership proof into the subtype. #### House‑keeping - Removed two obsolete `noncomputable` keywords from `Mathlib/MeasureTheory/MeasurablyGenerated.lean`; the affected instances are now computable. #### Notes - **No breaking changes**: the new definitions are additive; existing code continues to compile unchanged. - **No dependencies on other PRs**: this patch is self‑contained. new-contributor t-measure-probability 86/3 Mathlib.lean,Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean,Mathlib/MeasureTheory/MeasurableSpace/SigmaAlgebra.lean 3 1 ['github-actions'] nobody
16-62337
16 days ago
20-51306
20 days ago
20-51352
20 days
26881 emo916math
author:emo916math
feat(Analysis/Calculus/Deriv/Star) A formula for `deriv (conj ∘ f ∘ conj)` Added a lemma that `deriv (conj ∘ f ∘ conj) = conj ∘ deriv f ∘ conj`, proved by cases on whether the derivative mathematically exists or not. This PR replaces [#26805](https://github.com/leanprover-community/mathlib4/pull/26805); see discussion there. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-analysis 50/2 Mathlib/Analysis/Calculus/Deriv/Star.lean 1 7 ['emo916math', 'github-actions', 'kckennylau'] nobody
16-14218
16 days ago
19-11256
19 days ago
19-11301
19 days
26945 gasparattila
author:gasparattila
feat(LinearAlgebra/AffineSpace/AffineSubspace): basic properties of `sInf` and `iInf` These properties are analogous to the existing ones for the binary infimum. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
48/1 Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean 1 4 ['Ruben-VandeVelde', 'gasparattila', 'github-actions'] nobody
15-52038
15 days ago
17-17054
17 days ago
17-17101
17 days
26986 WangYiran01
author:WangYiran01
feat(Partition): add bijection for partitions with max part ≤ r ## Summary This PR adds a new theorem `partition_max_equals_bound` to `Mathlib.Combinatorics.Enumerative.Partition`. It constructs a bijection between: - The set of partitions of `n` in which `r ∈ π.parts` and all parts are `≤ r`, and - The set of partitions of `n - r` whose largest part is at most `r`. This provides a constructive proof via removing/adding `r` from/to the partition multiset, in line with classical enumerative combinatorics. ## Implementation notes - The proof uses `Multiset.erase` and `Multiset.cons` with basic properties of `sum`, `sup`, and `Partition` structures. - The bijection is implemented explicitly via `f` and `g`, and proven mutually inverse via `Subtype.ext`. ## Linting - [x] Passes `lake build` - [x] Linter clean (no commandStart or longLine issues) ## Author Contributed by Yiran Wang. new-contributor t-combinatorics 85/0 Mathlib/Combinatorics/Enumerative/Partition.lean 1 2 ['WangYiran01', 'github-actions'] nobody
15-48490
15 days ago
15-49855
15 days ago
15-49900
15 days
27000 gasparattila
author:gasparattila
feat(Analysis/Normed/Group/Quotient): isometric versions of isomorphisms This PR adds an isometric version of the third isomorphism theorem for groups and modules. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import new-contributor t-analysis 49/2 Mathlib/Analysis/Normed/Group/Quotient.lean 1 1 ['github-actions'] nobody
15-32618
15 days ago
15-32620
15 days ago
15-32673
15 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
14-58453
14 days ago
34-27874
1 month ago
34-27921
34 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 7 ['erdOne', 'github-actions', 'matthewjasper', 'riccardobrasca'] nobody
13-38925
13 days ago
84-41540
2 months ago
86-9837
86 days
25910 themathqueen
author:themathqueen
feat(Algebra/Ring/Idempotent): subtraction lemmas for idempotents and star projections This allows us to use subtraction with idempotents and star projections. For idempotents `p,q`, `q - p` is idempotent when `p * q = p = q * p`. For star projections `p,q`, `q - p` is a star projection when either `p * q = p` or `q * p = p`. In a star-ordered ring, when `p * q = p` or `q * p = p` we get `p ≤ q`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
70/0 Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Ring/Idempotent.lean,Mathlib/Algebra/Star/StarProjection.lean 3 23 ['github-actions', 'tb65536', 'themathqueen'] nobody
12-15733
12 days ago
26-63485
26 days ago
29-11247
29 days
27090 TerenceGitH
author:TerenceGitH
feat(Topology, Archive/Examples): Kuratowski's closure-complement theorem (incl. sharpness) This is the outcome of a course project at Heidelberg University: https://matematiflo.github.io/CompAssistedMath2025/ feat(Topology): Kuratowski's closure-complement theorem "Topology/Kuratowski.lean" proves Kuratowski's closure-complement theorem, which says that if one repeatedly applies the closure and complement operators to a set in a topological space, at most 14 distinct sets can be obtained. feat(Archive/Examples): sharpness of Kuratowski's closure-complement theorem: "Examples/Kuratowski.lean" gives an example of a so-called "14-set" in ℝ, from which exactly 14 distinct sets can be obtained. Co-authored-by: Luis Sand @luiis-sd Co-authored-by: Leon Müller @leondieprobifi Co-authored-by: Junyan Xu @alreadydone --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-topology 386/0 Archive.lean,Archive/Examples/Kuratowski.lean,Mathlib.lean,Mathlib/Topology/Kuratowski.lean 4 5 ['alreadydone', 'github-actions', 'wwylele'] nobody
12-8136
12 days ago
13-11659
13 days ago
13-13002
13 days
27200 rotarc75
author:rotarc75
feat(RingTheory/Ideal): oka predicates over ideals This PR introduces the notion of Oka predicates over the ideals of a ring. We usually speak of [Oka families](https://stacks.math.columbia.edu/tag/05K9) but predicates seemed more in line with mathlib's conventions. Currently this notions isn't used anywhere but we plan to make an other PR that proves that is all prime ideals of a ring are finitely generated, then this ring is Noetherian. We can also use Oka predicates to simplify the existing proof of [`IsPrincipalIdealRing.of_prime`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/PrincipalIdealDomainOfPrime.html#IsPrincipalIdealRing.of_prime). Co-authored-by: Anthony Fernandes --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
53/0 Mathlib.lean,Mathlib/RingTheory/Ideal/Oka.lean 2 1 ['github-actions'] nobody
10-44431
10 days ago
10-44431
10 days ago
10-45331
10 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 3 ['github-actions', 'pimotte', 'xcloudyunx'] nobody
9-79460
9 days ago
60-1494
1 month ago
60-1547
60 days
27226 xcloudyunx
author:xcloudyunx
feat(Combinatorics/SimpleGraph): Add Subgraph.inclusion_edge_apply_coe and inclusion_edgeSet_apply_coe This PR continues the work from #25248. Original PR: https://github.com/leanprover-community/mathlib4/pull/25248 new-contributor t-combinatorics 14/0 Mathlib/Combinatorics/SimpleGraph/Subgraph.lean 1 1 ['github-actions'] nobody
9-77969
9 days ago
9-79388
9 days ago
9-79445
9 days
27006 zhikaip
author:zhikaip
refactor: crossProduct notation Replace `×₃` with `⨯` (`\X` or `\crossproduct`), and manually deprecate the old syntax. See [#mathlib4 > Notation for crossProduct](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Notation.20for.20crossProduct/with/520119542) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor t-meta 37/22 Mathlib/Geometry/Euclidean/Angle/Unoriented/CrossProduct.lean,Mathlib/LinearAlgebra/CrossProduct.lean 2 10 ['eric-wieser', 'github-actions', 'j-loreaux', 'kmill'] nobody
9-27350
9 days ago
15-12786
15 days ago
15-22812
15 days
27245 rirarika
author:rirarika
MvPolynomial.Irreducible --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
88/0 Mathlib.lean,Mathlib/Algebra/MvPolynomial/Irreducible.lean 2 3 ['alreadydone', 'github-actions', 'mbkybky'] nobody
8-28247
8 days ago
8-54736
8 days ago
8-54780
8 days
27261 Sebi-Kumar
author:Sebi-Kumar
feat(Topology): add definition for subpaths Define subpaths as restrictions of paths to subintervals, reparameterized to have domain `[0, 1]` and possibly with a reverse of direction. Prove their basic properties. This serves as an alternative to `Path.truncate` which is useful for the explicit construction of certain homotopies, in particular regarding the concatenation of subpaths. --- To provide additional context, this is my first time contributing to Mathlib, and I am doing so as a part of the Fields Undergraduate Summer Research Program hosted at Western University. My intention for this file is for it to be used when proving that the fundamental group of the sphere is trivial (following the proof from Hatcher's "Algebraic Topology"). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-topology 148/0 Mathlib.lean,Mathlib/Topology/Subpath.lean 2 1 ['github-actions'] nobody
8-7270
8 days ago
8-17901
8 days ago
8-17949
8 days
26793 FlAmmmmING
author:FlAmmmmING
feat(Algebra/Group /ForwardDiff.lean): add five theorems for forward difference --- [![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$
212/3 Mathlib/Algebra/Group/ForwardDiff.lean 1 35 ['AntoineChambert-Loir', 'DAE123456', 'FlAmmmmING', 'Ruben-VandeVelde', 'github-actions', 'kckennylau', 'madvorak'] nobody
7-58251
7 days ago
8-71205
8 days ago
21-23693
21 days
27284 FernandoChu
author:FernandoChu
Chore(CategoryTheory/MorphismProperty/MonoFactorization): Factor out mono factorizations Factored out `MonoFactorisations` from the `Images` file; also rename it to `MonoFactori*z*ations` so it's inline with the rest of Mathlib. I'm also sneaking in some very basic extremal epis results if you don't mind, these were meant to be used to prove ```lean instance (priority := 100) hasStrongEpiImages_of_hasPullbacks_of_hasEqualizers [HasPullbacks C] [HasEqualizers C] : HasStrongEpiImages C ``` Which I noticed too late already had a proof; I think the proof has been improved anyways, it's just `infer_instance` now. new-contributor t-category-theory 419/259 Mathlib.lean,Mathlib/Algebra/Category/Grp/Images.lean,Mathlib/Algebra/Category/ModuleCat/Images.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/CategoryTheory/Abelian/Basic.lean,Mathlib/CategoryTheory/Category/Factorisation.lean,Mathlib/CategoryTheory/ConcreteCategory/EpiMono.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Images.lean,Mathlib/CategoryTheory/Limits/Shapes/ExtremalEpi.lean,Mathlib/CategoryTheory/Limits/Shapes/Images.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Shapes/StrongEpi.lean,Mathlib/CategoryTheory/Limits/Shapes/ZeroMorphisms.lean,Mathlib/CategoryTheory/Limits/Types/Images.lean,Mathlib/CategoryTheory/MorphismProperty/MonoFactorization.lean,Mathlib/CategoryTheory/Sites/Subsheaf.lean,Mathlib/Order/Category/NonemptyFinLinOrd.lean,scripts/nolints_prime_decls.txt 18 1 ['github-actions'] nobody
7-51454
7 days ago
7-54012
7 days ago
7-54063
7 days
26880 agjftucker
author:agjftucker
feat(Calculus/FDeriv/Partial): `hasStrictFDerivAt_uncurry_coprod` concerning partial derivatives Confident that other contributions will follow (e.g. #26300), I begin this file with only the result needed to apply the implicit function theorem to a curried function. --- - [x] depends on: #26742 [This dependency is very slight.] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 126/0 Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean 2 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
7-11129
7 days ago
7-11129
7 days ago
11-2310
11 days
27242 hugh-fox
author:hugh-fox
feat: add Gauss-like formula for sums of digit sums Adds `sum_digit_sum_base_pow_eq` to show a Gauss-like formula across sums of digit sums. This relies on an additional two simp lemmas, named `digits_sum_eq_self`, `digits_sum_base_mul_cancel`. Lastly, includes a specialization (which is a good bit simpler than the general formula) to base 10 named `sum_digit_sum_ten_pow_eq`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-data new-contributor 113/0 Mathlib/Data/Nat/Digits/Lemmas.lean 1 5 ['github-actions', 'hugh-fox', 'kckennylau'] nobody
7-10032
7 days ago
8-73810
8 days ago
8-73857
8 days
27292 gasparattila
author:gasparattila
feat: asymptotic cone of a set This PR defines the asymptotic cone of a set in a normed affine space and proves its main properties. This is partial progress towards showing that an unbounded finite-dimensional convex set contains a ray. --- - [ ] depends on: #27221 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 441/0 Mathlib.lean,Mathlib/Analysis/Normed/Affine/AsymptoticCone.lean,Mathlib/Order/Filter/Map.lean 3 6 ['AntoineChambert-Loir', 'gasparattila', 'github-actions', 'mathlib4-dependent-issues-bot'] nobody
6-9086
6 days ago
7-13909
7 days ago
7-14956
7 days
27325 or4nge19
author:or4nge19
feat(combinatorics): Path decomposition and boundary crossing This PR is the second in the series to build API for Quiver.Path in support of formalizing the Perron-Frobenius theorem. https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Formalizing.20Perron-Frobenius/with/529260566 This adds basic path decomposition and theorems about paths crossing set boundaries. Path Decomposition The PR introduces two fundamental ways to decompose any non-empty path p: eq_cons_of_ne_nil: Decomposes p into a prefix and a final edge (p = p'.cons e). eq_toPath_comp_of_ne_nil': Decomposes p into a first edge and a suffix (p = e.toPath.comp p'). These provide the structural induction principles needed for many proofs on paths. Boundary Crossing The main result is exists_boundary_edge, which formalizes the intuitive notion that a path starting outside a set S and ending inside it must cross the boundary. The theorem proves the existence of a "boundary edge" u ⟶ v (where u ∉ S and v ∈ S) and provides the full path decomposition at the point of crossing. Also included are: exists_boundary_edge_from_set: The symmetric version for paths leaving a set. exists_crossing_edge: A convenient corollary that guarantees the existence of a boundary-crossing edge without the full decomposition. This work will be used in subsequent PRs to reason about how paths interact with subsets of vertices, as utilized in our formalization of PF theorem Next Steps The next PR will introduce Path.vertices to create a list representation of the vertices a path visits, last prerequisite for defining path simplicity and cycles. new-contributor t-combinatorics 105/0 Mathlib.lean,Mathlib/Combinatorics/Quiver/Path/Decomposition.lean 2 1 ['github-actions'] nobody
5-31188
5 days ago
5-36970
5 days ago
5-37014
5 days
27082 staroperator
author:staroperator
feat(Order/WellFoundedSet): add `Set.IsPWO.exists_le_minimal`, `Set.IsPWO.exists_minimal`, `Set.IsPWO.exists_minimalFor` which are the `IsPWO` version of `exists_minimal_le_of_wellFoundedLT` and others. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-order 22/0 Mathlib/Order/WellFoundedSet.lean 1 4 ['alreadydone', 'github-actions', 'staroperator'] nobody
4-72741
4 days ago
13-22155
13 days ago
13-22201
13 days
27332 or4nge19
author:or4nge19
feat(combinatorics): Define vertices of a Quiver.Path This PR is linked to #27315 and #27325. It's part of PRing the formalization of core PF theorem here https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Formalizing.20Perron-Frobenius/with/525516636 This adds: Quiver.Path.vertices: A List V representing the sequence of vertices along a path. Quiver.Path.vertices_set: The Set of vertices visited. Quiver.Path.vertices_finset: The Finset of vertices visited. Quiver.Path.init_finset: The Finset of vertices excluding the final vertex of the path, needed for defining simple paths and cycles. vertices_comp: A proof that the vertices of a composed path p.comp q are p.vertices.dropLast ++ q.vertices. vertices_length: The length of the vertices list is p.length + 1. Lemmas connecting vertices to standard list operations like head?, getLast, and get. Lemmas for membership: start_mem_vertices and end_mem_vertices. This is the prerequisite for defining path simplicity and formalizing cycle extraction, as used in the formalization of the Perron-Frobenius theorem --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-combinatorics 263/0 Mathlib.lean,Mathlib/Combinatorics/Quiver/Path/Vertices.lean 2 1 ['github-actions'] nobody
4-50873
4 days ago
5-6901
5 days ago
5-6954
5 days
27229 WilliamCoram
author:WilliamCoram
feat(GroupTheory/DoubleCoset): multiple lemmas From FLT --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
106/0 Mathlib/GroupTheory/DoubleCoset.lean 1 1 ['github-actions'] nobody
4-38828
4 days ago
9-26931
9 days ago
9-26982
9 days
27357 jcreedcmu
author:jcreedcmu
feat(Algebra/Module/Submodule): add `submoduleMap` for isometries Per [discussion on Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Analog.20of.20LinearEquiv.2EsubmoduleMap.20for.20AffineIsometryEquiv.3F), add a version of `.submoduleMap` for `LinearIsometry` and `LinearIsometryEquiv` by analogy with `LinearMap.submoduleMap` and `LinearEquiv.submoduleMap`. --- new-contributor t-algebra
label:t-algebra$
56/0 Mathlib.lean,Mathlib/Analysis/Normed/Operator/LinearIsometrySubmoduleMap.lean 2 12 ['Ruben-VandeVelde', 'eric-wieser', 'github-actions', 'jcreedcmu'] nobody
4-4124
4 days ago
4-9307
4 days ago
4-9359
4 days
27040 Scarlett-le
author:Scarlett-le
feat(Geometry/Euclidean/Sphere/Power): add power of a point theorems Add the definition of power of a point and fundamental theorems relating point positions to intersection distances: * `Sphere.power`: The power of a point with respect to a sphere, defined as the square of the distance from the point to the center minus the square of the radius. * `Sphere.power_eq_zero_iff_mem_sphere`: A point lies on the sphere if and only if its power is zero. * `Sphere.power_pos_iff_dist_center_gt_radius`: The power is positive if and only if the point is outside the sphere. * `Sphere.power_neg_iff_dist_center_lt_radius`: The power is negative if and only if the point is inside the sphere. * `Sphere.mul_dist_eq_power_of_dist_center_gt_radius`: For external points, the product of intersection distances equals the power. * `Sphere.mul_dist_eq_neg_power_of_dist_center_lt_radius`: For internal points, the product equals the negative power. * `Sphere.mul_dist_eq_abs_power`: General form relating intersection distance products to absolute power. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-euclidean-geometry 138/1 Mathlib/Geometry/Euclidean/Sphere/Power.lean 1 3 ['alreadydone', 'github-actions'] jsm28
assignee:jsm28
3-48328
3 days ago
14-15795
14 days ago
14-16336
14 days
27399 MoritzBeroRoos
author:MoritzBeroRoos
feat: replace every usage of ⬝ᵥ (with old \cdot) by ·ᵥ (with \centerdot) Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations `\cdot` and `\centerdot` resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for `center`..): - `\cdot` gives ⬝ [U+2B1D](https://www.compart.com/en/unicode/U+2B1D) "Black Very Small Square" - `\centerdot` gives · [U+00B7](https://www.compart.com/en/unicode/U+00B7) "Middle Dot" Mathlib mostly uses the `\centerdot` variant, except for the dotProduct notation and some probably unsuspecting people wanting \centerdot but getting \cdot in their comments and 6 uses of a notation using the raw `\cdot` without any subscript at `Mathlib\Topology\Homotopy\Product.lean`. This PR replaces the dot product `⬝ᵥ` with its `\centerdot` counterpart `·ᵥ`. The related PR [here](https://github.com/leanprover/vscode-lean4/pull/639) can then overwrite the `\cdot` abbreviation, to produce the same symbol as the `centerdot` abbreviation does. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 133/133 Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/Topology/Instances/Matrix.lean 25 5 ['MoritzBeroRoos', 'eric-wieser', 'github-actions'] nobody
3-8106
3 days ago
3-16588
3 days ago
3-16624
3 days
27403 MoritzBeroRoos
author:MoritzBeroRoos
feat: replace probably erroneous usage of ⬝ (with old \cdot) by · (with \centerdot) Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations \cdot and \centerdot resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for center..). This pr replaces instances of ⬝ where · was probably meant. All of the replacement is in comments, except for the file bench_summary.lean which is used for priting the github benchmark results. Since this file is about scientific notation of numbers, sure · was meant to be used, not a rectangle. [Related](https://github.com/leanprover-community/mathlib4/pull/27399) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 195/195 Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/DirectSum/Idempotents.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/Normed/Unbundled/InvariantExtension.lean,Mathlib/Analysis/SpecialFunctions/Complex/CircleAddChar.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/FieldTheory/PurelyInseparable/PerfectClosure.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/NumberTheory/SiegelsLemma.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Instances/Matrix.lean,scripts/bench_summary.lean 49 3 ['eric-wieser', 'github-actions'] nobody
3-5361
3 days ago
3-8851
3 days ago
3-8845
3 days
27378 peakpoint
author:peakpoint
refactor(Geometry/Euclidean/Projection): redefine projection and reflection for affine subspaces This PR continues the work from #25578. Original PR: https://github.com/leanprover-community/mathlib4/pull/25578 new-contributor t-euclidean-geometry 316/317 Mathlib/Analysis/Normed/Affine/ContinuousAffineMap.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Geometry/Euclidean/Circumcenter.lean,Mathlib/Geometry/Euclidean/Projection.lean 4 3 ['github-actions', 'peakpoint'] nobody
2-64081
2 days ago
2-64081
2 days ago
2-64630
2 days
27230 paulorauber
author:paulorauber
feat(Probability): Prove Hoeffding's lemma corollary Prove a corollary of Hoeffding's lemma for random variables with non-zero expectation. This simple corollary was suggested by a reviewer based on a recent contribution (#26744). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 18/9 Mathlib/Probability/Moments/SubGaussian.lean 1 1 ['github-actions'] nobody
2-30925
2 days ago
9-25015
9 days ago
9-25065
9 days
26783 matthewjasper
author:matthewjasper
feat(RingTheory/Flat): Add theorems relating Submodule.torsion and Module.Flat Co-authored-by: Kevin Buzzard --- This PR continues the work from #25334. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) FLT new-contributor t-algebra
label:t-algebra$
205/0 Mathlib.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/RingTheory/Flat/TorsionFree.lean,Mathlib/RingTheory/Ideal/IsPrincipal.lean 5 1 ['github-actions'] nobody
2-7103
2 days ago
21-39545
21 days ago
21-39575
21 days
27320 Jlh18
author:Jlh18
doc (CategoryTheory/Bicategory/Grothendieck): rename Grothendieck to coGrothendieck Rename `CategoryTheory.Pseudofunctor.Grothendieck` to `CategoryTheory.Pseudofunctor.coGrothendieck`. Currently there are two inconsistent conventions taken in [`CategoryTheory.Grothendieck`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/CategoryTheory/Grothendieck.html#CategoryTheory.Grothendieck) and [`CategoryTheory.Pseudofunctor.Grothendieck`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/CategoryTheory/Bicategory/Grothendieck.html#CategoryTheory.Pseudofunctor.Grothendieck), namely the latter includes an `op` on the indexing category / base category of the Grothendieck construction. Later on, I will make more PRs to introduce the version of `CategoryTheory.Pseudofunctor.Grothendieck` that does not have an `op`. Zulip discussion: [#mathlib4 > Refactor Grothendieck from Pseudofunctor.Grothendieck](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Refactor.20Grothendieck.20from.20Pseudofunctor.2EGrothendieck/with/529165679). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-category-theory 21/13 Mathlib/CategoryTheory/Bicategory/Grothendieck.lean,Mathlib/CategoryTheory/FiberedCategory/Grothendieck.lean 2 1 ['github-actions'] nobody
2-2689
2 days ago
2-15712
2 days ago
3-78810
3 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 105/0 Mathlib/Data/Sum/Basic.lean,Mathlib/Topology/Constructions/SumProd.lean 2 4 ['ADedecker', 'github-actions'] nobody
1-36346
1 day ago
38-31045
1 month ago
38-31037
38 days
27331 Equilibris
author:Equilibris
feat(Data/List/Pairwise): Add two lemmas about pairwise and pwFilter - `Pairwise.mem_list_of_mem_pwFilter` states that every member of a pwFilter is a mem of the list pwFilter is in - `pairwise_pwfilter_of_pairwise` show how pwFilter maintains a generic pairwise structure --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor 32/0 Mathlib/Data/List/Pairwise.lean 1 1 ['github-actions'] nobody
1-35152
1 day ago
1-35152
1 day ago
2-26445
2 days
27472 guelmi94
author:guelmi94
feat(Combinatorics/SimpleGraph/Walk): add lemma `support_injective` This contribution was created as part of the Utrecht Summerschool "Formalizing Mathematics in Lean" in July 2025. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-combinatorics 3/0 Mathlib/Combinatorics/SimpleGraph/Walk.lean 1 1 ['github-actions'] nobody
1-30885
1 day ago
1-30888
1 day ago
1-30938
1 day
25951 themathqueen
author:themathqueen
feat(Analysis/InnerProductSpace/MulOpposite): defines the inner product on opposite spaces This pr defines the inner product on opposite spaces. - [x] depends on: #25949 Motivation for having the inner product structure on the opposite: One application comes up in non-commutative graphs, which are defined on a finite-dimensional C*-algebra with a faithful and positive functional (a Hilbert space structure can be induced by the defined faithful and positive functional (will be added to a pr soon)). For example, we'd need the Hilbert space structure to be defined on the opposite space to define the isomorphism: `(A →ₗ[ℂ] B) ≃ₗ[ℂ] TensorProduct ℂ B Aᵐᵒᵖ`, where `A`, `B` are again finite-dimensional C*-algebras with faithful and positive functionals. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 71/0 Mathlib.lean,Mathlib/Analysis/InnerProductSpace/MulOpposite.lean 2 6 ['github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'themathqueen'] nobody
1-24370
1 day ago
3-41778
3 days ago
20-63290
20 days
27484 gasparattila
author:gasparattila
feat(Topology/Semicontinuous): use weaker assumptions for some results Previously, several results about semicontinuity assumed a dense ordering. In `lowerSemicontinuous_iff_isClosed_epigraph`, there was also a completeness requirement on the order, preventing its use with real-valued functions. This PR removes these superfluous assumptions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-topology 47/21 Mathlib/Topology/Semicontinuous.lean 1 1 ['github-actions'] nobody
1-17287
1 day ago
1-17618
1 day ago
1-17665
1 day
27400 dleijnse
author:dleijnse
feat: define geometrically reduced algebras Define geometrically reduced algebras, and prove that if all finitely generated subalgebras of an algebra `A` are geometrically reduced, then `A` is geometrically reduced. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
137/0 Mathlib.lean,Mathlib/RingTheory/Nilpotent/GeometricallyReduced.lean 2 23 ['dleijnse', 'github-actions', 'kckennylau'] nobody
1-7257
1 day ago
3-12146
3 days ago
3-12192
3 days
26660 strihanje01
author:strihanje01
feat(Combinatorics/Additive/VerySmallDoubling): weak non-commutative Kneser's theorem add theorem about the structure of a doubling smaller than the golden ratio --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import new-contributor t-combinatorics 430/5 Mathlib/Combinatorics/Additive/VerySmallDoubling.lean 1 61 ['YaelDillies', 'github-actions', 'strihanje01'] nobody
0-34698
9 hours ago
15-15416
15 days ago
20-65637
20 days
27496 bwangpj
author:bwangpj
feat(Topology/Instances/Matrix): topology of `Set.matrix` Prove topological results (`IsOpen`, `IsCompact`) about `Set.matrix`. - [x] depends on: #27190 [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/Set.2Ematrix/near/527826651) Co-authored-by: Kevin Buzzard --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 25/0 Mathlib/Data/Matrix/Defs.lean,Mathlib/Topology/Instances/Matrix.lean 2 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
0-31152
8 hours ago
0-31723
8 hours ago
0-35180
9 hours
26757 fweth
author:fweth
feat(CategoryTheory/Topos): define elementary topos This commit begins the formalization of the notion of an *elementary topos*, following the definition in \[Mac Lane & Moerdijk, *Sheaves in Geometry and Logic* (1992), Ch. IV, Section 1]. It introduces the file `Mathlib/CategoryTheory/Topos/Basic.lean`, which currently includes: * The definition of an elementary topos. * Proof that the power object map is a functor * Theorem about pullbacks of characterstic maps Subobject classifiers, which are used in the definition, have already been defined in `CategoryTheory/Topos/Classifier.lean` Work in progress: further formalization of the section is planned. Questions: * Should the definition of power objects be separated into its own file/module, perhaps under `CategoryTheory/Topos/PowerObject.lean`? * Is the notation `P` / `P_morph` / `P_functor` for the power object functor on objects / morphisms / total acceptable? * Should the comments and docstrings rather use the notation from the book, where `g ∘ f` denotes arrow composition from righ to left, or the Lean variant `f ≫ g`? Klaus Gy klausgy@gmail.com --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-category-theory 262/72 Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Equalizer.lean,Mathlib/CategoryTheory/Topos/Basic.lean,Mathlib/CategoryTheory/Topos/Classifier.lean 6 5 ['fweth', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant'] nobody
0-26893
7 hours ago
0-37320
10 hours ago
17-77468
17 days
27509 bjornsolheim
author:bjornsolheim
feat (Geometry/Convex/Cone): add conical hull and cone tensor products Add three new files: **AppendLemmas** (`Geometry/Convex/Cone/AppendLemmas.lean`): - Prove lemmas for appending/de-appending finite sequences **ConicalHull** (`Geometry/Convex/Cone/ConicalHull.lean`): - Prove closure properties of sequences with nonnegative coefficients - Define conical hull - Prove that the smallest pointed cone containing s is the conical hull of s **TensorProduct** (`Geometry/Convex/Cone/TensorProduct.lean`): - Define minimal and maximal tensor products of cones - Prove that min tensor product ≤ max tensor product Tensor products of ordered modules don't have a unique ordering. Natural choices are bounded by the minimal and maximal tensor products of cones. t-convex-geometry new-contributor 469/0 Mathlib.lean,Mathlib/Geometry/Convex/Cone/AppendLemmas.lean,Mathlib/Geometry/Convex/Cone/ConicalHull.lean,Mathlib/Geometry/Convex/Cone/TensorProduct.lean 4 3 ['YaelDillies', 'bjornsolheim', 'github-actions'] nobody
0-20785
5 hours ago
0-37521
10 hours ago
0-37571
10 hours
27511 Nebula691
author:Nebula691
feat(Algebra/QuadraticAlgebra) : Define Quadratic Algebra co-authored-by : Edison Xie co-authored-by : Kenny Lau --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
445/0 Mathlib.lean,Mathlib/Algebra/QuadraticAlgebra.lean 2 25 ['Whysoserioushah', 'github-actions', 'kckennylau'] nobody
0-6705
1 hour ago
0-27793
7 hours ago
0-27839
7 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
26765 KiringYJ
author:KiringYJ
feat(MeasureTheory/PiSystem): add π-λ theorem and SetLike instance Add two small features to `MeasureTheory/PiSystem`: 1. SetLike instance `instance : SetLike (DynkinSystem α) (Set α)` This lets us write `s ⊆ d` and `t ∈ d` for a DynkinSystem `d`, matching usual mathlib style. 2. `DynkinSystem.pi_lambda` lemma Classical π‑λ theorem: if a π‑system `s` is contained in a Dynkin system `d`, every set measurable for `σ(s)` is also in `d`. Currently, mathlib exposes this result only indirectly (e.g. via `generateFrom_eq`). Although logically equivalent, it is not obvious at first glance that those lemmas are the π‑λ theorem. The new lemma states the result in its familiar textbook form, so users can recognise and cite it immediately. Both pieces are under 10 lines, term‑mode only, and do not modify existing APIs. No breaking changes. No dependencies. new-contributor t-measure-probability easy 13/0 Mathlib/MeasureTheory/PiSystem.lean 1 10 ['KiringYJ', 'github-actions', 'ocfnash'] nobody
19-33666
19 days ago
19-56919
19 days ago
22-17375
22 days
27110 pechersky
author:pechersky
chore(Valued/WithVal): apply_symm_equiv valuation on the WIthVal is equal to the underlying valuation and simp tag --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra t-topology t-number-theory easy
label:t-algebra$
4/0 Mathlib/Topology/Algebra/Valued/WithVal.lean 1 1 ['github-actions'] nobody
12-68524
12 days ago
12-68527
12 days ago
12-68582
12 days
27035 faenuccio
author:faenuccio
chore(IsManifold/Basic): replace continuity by aesop --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-differential-geometry easy 5/5 Mathlib/Geometry/Manifold/IsManifold/Basic.lean 1 3 ['faenuccio', 'fpvandoorn', 'github-actions'] nobody
11-24826
11 days ago
14-24275
14 days ago
14-27163
14 days
26853 oliver-butterley
author:oliver-butterley
feat(Mathlib/MeasureTheory/MeasurableSpace/Invariants): add `comp_eq_of_measurable_invariants` Invariance of `g` follows from `Measurable[invariants f] g`. Co-authored-by: Lua Viana Reis --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-measure-probability easy 6/0 Mathlib/MeasureTheory/MeasurableSpace/Invariants.lean 1 2 ['Ruben-VandeVelde', 'github-actions'] nobody
8-48626
8 days ago
8-48626
8 days ago
19-1072
19 days
27248 kckennylau
author:kckennylau
chore: remove `suppress_compilation` from Mathlib.Algebra.Category.Ring.Constructions --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra easy
label:t-algebra$
2/4 Mathlib/Algebra/Category/Ring/Constructions.lean 1 4 ['github-actions', 'grunweg', 'leanprover-bot'] nobody
8-10100
8 days ago
8-41984
8 days ago
8-42033
8 days
27450 eric-wieser
author:eric-wieser
chore(LinearAlgebra/QuadraticForm): missing `coe_mk` and `norm_cast` Also fixes an over-applied `simps`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra easy
label:t-algebra$
12/8 Mathlib/LinearAlgebra/QuadraticForm/Basic.lean 1 1 ['github-actions'] nobody
1-84453
1 day ago
1-84467
1 day ago
1-84513
1 day
26833 pechersky
author:pechersky
feat(ValuativeRel): MulArchimedean (ValueGroupWithZero R) when IsRankLeOne with a proof_wanted for the reverse implication --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order t-algebra t-number-theory easy
label:t-algebra$
13/0 Mathlib/RingTheory/Valuation/ValuativeRel.lean 1 5 ['github-actions', 'pechersky', 'wwylele'] nobody
1-77264
1 day ago
1-79566
1 day ago
19-68557
19 days
27458 Louddy
author:Louddy
feat(Composition): add simp lemmas Add two simp lemmas `embedding_comp_inv` and `index_embedding`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics easy 2/0 Mathlib/Combinatorics/Enumerative/Composition.lean 1 1 ['github-actions'] nobody
1-50004
1 day ago
1-50004
1 day ago
1-52363
1 day

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
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/Basic.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 3 ['Parcly-Taxel', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak'] nobody
19-44712
19 days ago
19-78684
19 days ago
42-58861
42 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 131/122 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/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 27 5 ['Parcly-Taxel', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak'] nobody
17-69958
17 days ago
17-69979
17 days ago
42-55393
42 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 11 ['Parcly-Taxel', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant'] nobody
10-74855
10 days ago
19-78918
19 days ago
42-61307
42 days
27339 pechersky
author:pechersky
chore(RingTheory/Laurent): use WithZero.exp to golf statements and proofs about valuation on K((X)) Done as part of refactor of Valued in #27314. This PR does not change any definitions. Instead, uses `WithZero.exp` instead of coercion + Multiplicative.ofAdd. And some helper simp lemmas about valuations of RatFunc vis a vis LaurentSeries. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) tech debt t-algebra t-number-theory
label:t-algebra$
78/77 Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean 3 1 ['github-actions'] nobody
4-29759
4 days ago
4-29759
4 days ago
4-73755
4 days
27439 Vierkantor
author:Vierkantor
chore(*): review 2024-04-01 adaptation notes There are three kinds of adaptation notes from the changes on 2024-04-01. One about `erw` "blowing up"; this referred to a backwards compatibility flag that was already removed long ago (#14064). So this can just be deleted. A few about needing to use `symm` before `ext` fires: this is because `apply` failing to unify when mixing very general limit definitions and very specific operations for equalizers/pullbacks. I propose we fix this by unfolding the terms manually in an `intro` type ascription. In the longer term we should consider instead specializing the limit lemmas to these specific shapes. A few about `aesop` not working. This has the same underlying cause, due to `ext` not applying, so it now looks like `intro s (m : _ --> _) x; aesop`. Same specializing of the limit lemmas may be useful here. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) tech debt 8/25 Mathlib/AlgebraicGeometry/Spec.lean,Mathlib/CategoryTheory/Limits/Shapes/KernelPair.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean 4 1 ['github-actions'] nobody
2-18579
2 days ago
2-18655
2 days ago
2-18640
2 days
27455 pechersky
author:pechersky
chore(NumberTheory/Padics/Hensel): rephrase using `aeval` This is easier to use at call site, because on need not pass `Polynomial.map (algebraMap _ _ )` in the use of `hensels_lemma` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) tech debt t-algebra t-number-theory
label:t-algebra$
157/138 Mathlib/NumberTheory/Padics/Hensel.lean 1 1 ['github-actions'] nobody
1-73876
1 day ago
1-73931
1 day ago
1-73930
1 day