The mathlib review queue

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This dashboard was last updated on: September 17, 2025 at 19:54 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
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'] ericrbg
assignee:ericrbg
49-760
1 month ago
59-77836
1 month ago
80-37991
80 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 91/37 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'] alexjbest
assignee:alexjbest
47-77631
1 month ago
66-37558
2 months ago
66-37583
66 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'] ADedecker
assignee:ADedecker
47-11286
1 month ago
92-86252
3 months ago
92-86297
92 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'] bryangingechen
assignee:bryangingechen
46-67993
1 month ago
77-75733
2 months ago
97-39915
97 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'] robertylewis
assignee:robertylewis
45-67958
1 month ago
67-41247
2 months ago
67-41317
67 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 2 ['b-mehta', 'github-actions'] joelriou
assignee:joelriou
45-11801
1 month ago
97-39767
3 months ago
97-39747
97 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'] ADedecker
assignee:ADedecker
44-67970
1 month ago
64-33434
2 months ago
120-16698
120 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'] erdOne
assignee:erdOne
44-67967
1 month ago
91-69708
2 months ago
91-69751
91 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 t-data 30/0 Mathlib.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Data/Finset/RangeDistance.lean 3 2 ['github-actions', 'mans0954'] alreadydone
assignee:alreadydone
44-34969
1 month ago
44-34969
1 month ago
85-44379
85 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'] mariainesdff
assignee:mariainesdff
43-67969
1 month ago
65-17227
2 months ago
65-27015
65 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-ring-theory 120/0 Mathlib.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Subsemiring.lean 2 1 ['github-actions'] kim-em
assignee:kim-em
43-36913
1 month ago
43-36913
1 month ago
92-5630
92 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/) t-ring-theory toric 309/0 Mathlib.lean,Mathlib/RingTheory/Bialgebra/GroupLike.lean,Mathlib/RingTheory/Coalgebra/GroupLike.lean,Mathlib/RingTheory/HopfAlgebra/GroupLike.lean 4 42 ['Julian-Kuelshammer', 'Parcly-Taxel', 'Whysoserioushah', 'YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot', 'smorel394'] eric-wieser
assignee:eric-wieser
43-36807
1 month ago
43-36807
1 month ago
129-80262
129 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'] dagurtomas
assignee:dagurtomas
42-43700
1 month ago
54-18011
1 month ago
63-51650
63 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'] awainverse
assignee:awainverse
41-67981
1 month ago
74-79459
2 months ago
74-79500
74 days
27229 WilliamCoram
author:WilliamCoram
feat(GroupTheory/DoubleCoset): multiple lemmas From FLT --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-group-theory new-contributor 106/0 Mathlib/GroupTheory/DoubleCoset.lean 1 2 ['github-actions', 'mathlib4-merge-conflict-bot'] mariainesdff
assignee:mariainesdff
41-25452
1 month ago
41-26185
1 month ago
57-74147
57 days
27991 sinianluoye
author:sinianluoye
feat (Rat): add Rat.den_eq_of_add_den_eq_one and its dependent lemmas ```lean4 example {q r : ℚ} (h : (q + r).den = 1) : q.den = r.den := by ``` It is so simple, but I couldn't find it in current mathlib repo. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor 28/0 Mathlib/Data/Rat/Lemmas.lean 1 14 ['github-actions', 'sinianluoye', 'themathqueen'] nobody
41-8167
1 month ago
42-67570
1 month ago
43-9221
43 days
26765 KiringYJ
author:KiringYJ
feat(MeasureTheory/PiSystem): add π-λ theorem and SetLike instance Add two small features to `MeasureTheory/PiSystem`: 1. SetLike instance `instance : SetLike (DynkinSystem α) (Set α)` This lets us write `s ⊆ d` and `t ∈ d` for a DynkinSystem `d`, matching usual mathlib style. 2. `DynkinSystem.pi_lambda` lemma Classical π‑λ theorem: if a π‑system `s` is contained in a Dynkin system `d`, every set measurable for `σ(s)` is also in `d`. Currently, mathlib exposes this result only indirectly (e.g. via `generateFrom_eq`). Although logically equivalent, it is not obvious at first glance that those lemmas are the π‑λ theorem. The new lemma states the result in its familiar textbook form, so users can recognise and cite it immediately. Both pieces are under 10 lines, term‑mode only, and do not modify existing APIs. No breaking changes. No dependencies. new-contributor t-measure-probability 13/0 Mathlib/MeasureTheory/PiSystem.lean 1 13 ['EtienneC30', 'KiringYJ', 'github-actions', 'ocfnash'] RemyDegenne
assignee:RemyDegenne
40-67980
1 month ago
48-17629
1 month ago
75-5470
75 days
27534 PierreQuinton
author:PierreQuinton
feat: a typeclass for `sSup`/`sInf` to be lawful Adds lawful infima and suprema type classes. A preorder with lawful suprema: whenever a set has a least upper bound, `sSup` returns a least upper bound for that set. A preorder with lawful infima: whenever a set has a greatest lower bound, `sInf` returns a greastest lower bound for that set. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order 121/8 Mathlib.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/LawfulSupInf.lean 3 25 ['PierreQuinton', 'YaelDillies', 'github-actions', 'plp127', 'vihdzp'] YaelDillies
assignee:YaelDillies
40-31757
1 month ago
52-15054
1 month ago
52-15085
52 days
28111 euprunin
author:euprunin
chore: remove tactic `simp_lex` and use `simp` instead Motivation: `simp_lex` is just shorthand for `refine toLex.surjective.forall₃.2 ?_; rintro (a | a) (b | b) (c | c) <;> simp`, so plain `simp` seems preferable. t-data 4/10 Mathlib/Data/Sum/Interval.lean 1 5 ['eric-wieser', 'euprunin', 'github-actions'] nobody
40-19240
1 month ago
40-19323
1 month ago
40-26951
40 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'] joelriou
assignee:joelriou
39-67999
1 month ago
74-43216
2 months ago
96-1581
96 days
27664 pechersky
author:pechersky
feat(Topology,Analysis): discrete topology metric space and normed groups Explicit construction of the discrete topology metric space and normed groups where `dist x y = 1` for all `x != y` Provide PseudoMetricSpace, MetricSpace, Seminormed(Add)Group, and Normed(Add)Group constructions --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 137/0 Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Topology/MetricSpace/Basic.lean,Mathlib/Topology/MetricSpace/Pseudo/Constructions.lean 3 3 ['github-actions', 'kckennylau', 'pechersky'] urkud
assignee:urkud
39-67991
1 month ago
49-58003
1 month ago
49-57993
49 days
28077 ShreckYe
author:ShreckYe
feat(Data/Finset/Card): add some more Pigeonhole Principle theorems `exists_ne_map_eq_of_card_image_lt` and `not_injOn_of_card_image_lt` `exists_ne_map_eq_of_card_image_lt` is a special case of `exists_ne_map_eq_of_card_lt_of_maps_to` where `t` is `s.image f`, and `not_injOn_of_card_image_lt` is its variant using `Set.InjOn`. I ran into some cases where such theorems would save me some time. t-data new-contributor 10/0 Mathlib/Data/Finset/Card.lean 1 4 ['ShreckYe', 'github-actions', 'themathqueen'] nobody
37-22278
1 month ago
41-34060
1 month ago
41-34105
41 days
24850 pechersky
author:pechersky
feat(Topology/UniformSpace/Ultra): uniform spaces induced by pseudometrics are ultra if system is ultra Any uniform space has a natural system of pseudometrics definable on it, comprised of those pseudometrics constructed from a descending chain of equivalence relation entourages. In a nonarchimedean uniformity, this pseudometric system induces the uniformity. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #23111 t-topology 509/1 Mathlib.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/UniformSpace/Ultra/Pseudometrizable.lean 3 8 ['ADedecker', 'fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'pechersky'] urkud
assignee:urkud
36-67997
1 month ago
99-55307
3 months ago
115-839
115 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'] TwoFX
assignee:TwoFX
36-67993
1 month ago
74-37530
2 months ago
74-40573
74 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'] urkud
assignee:urkud
36-67992
1 month ago
68-20719
2 months ago
68-20768
68 days
27815 BGuillemet
author:BGuillemet
feat(CategoryTheory/Limits/Shapes/Products): add limMapPi and sigmaMapColim Add the canonical morphism from a limit to the product over its objects. Prove that it is a monomorphism. Dually, add the canonical morphism to a colimit from the coproduc of its objects and prove that it is an epimorphism. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-category-theory 44/0 Mathlib/CategoryTheory/Limits/Shapes/Products.lean 1 1 ['github-actions'] jcommelin
assignee:jcommelin
36-67987
1 month ago
47-27689
1 month ago
47-27712
47 days
27552 Equilibris
author:Equilibris
refactor: make universe levels visible in typevec This will be needed to allow `M.corec` to be generic across universes --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor easy 16/10 Mathlib/Data/TypeVec.lean 1 9 ['Equilibris', 'eric-wieser', 'github-actions', 'plp127'] nobody
35-49134
1 month ago
36-1553
1 month ago
52-14069
52 days
27754 Parcly-Taxel
author:Parcly-Taxel
feat: `finCycle` as iterated `finRotate` Originally used in #25786, but eventually discovered to be unnecessary. t-logic 26/5 Mathlib/Logic/Equiv/Fin/Rotate.lean 1 1 ['github-actions'] fpvandoorn
assignee:fpvandoorn
34-67983
1 month ago
48-16339
1 month ago
48-16390
48 days
28057 plp127
author:plp127
feat(SuccOrder): simp lemma to refold `Order.succ` and `Order.pred` Adds `SuccOrder.succ_eq_succ` and `PredOrder.pred_eq_pred` to refold `SuccOrder.succ` and `PredOrder.pred` into `Order.succ` and `Order.pred`. These lemmas are marked `@[simp]`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order 8/2 Mathlib/Order/SuccPred/Basic.lean 1 3 ['YaelDillies', 'github-actions', 'plp127', 'vihdzp'] bryangingechen
assignee:bryangingechen
34-25685
1 month ago
42-6864
1 month ago
42-6911
42 days
27946 plp127
author:plp127
refactor: have `MetrizableSpace` not depend on `MetricSpace` Some theorems for uniform spaces with a countably generated uniformity do not mention their uniformity in any of the hypotheses or the conclusion (for example `UniformSpace.isCompact_iff_isSeqCompact`). This PR allows those theorems to be stated for (pseudo)metrizable spaces without importing the real numbers. See also #2032 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 129/102 Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Topology/Compactness/PseudometrizableLindelof.lean,Mathlib/Topology/GDelta/MetrizableSpace.lean,Mathlib/Topology/Metrizable/Basic.lean,Mathlib/Topology/Metrizable/ContinuousMap.lean,Mathlib/Topology/Metrizable/Real.lean,Mathlib/Topology/Metrizable/Uniformity.lean 7 7 ['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] urkud
assignee:urkud
33-67968
1 month ago
43-36253
1 month ago
44-1731
44 days
28141 YaelDillies
author:YaelDillies
chore: deprecate `BialgHom.coe_toLinearMap` `BialgHom.toLinearMap` is a fake projection. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory toric easy 5/11 Mathlib/RingTheory/Bialgebra/Hom.lean 1 8 ['YaelDillies', 'eric-wieser', 'github-actions'] alreadydone
assignee:alreadydone
31-67971
1 month ago
39-45100
1 month ago
39-45096
39 days
28557 ShreckYe
author:ShreckYe
feat(Data/Nat/Factorization): some results on equality of powers of naturals proved from factorization I came across some math olympiad problems in number theory that could benefit from these theorems, expecially those on the prime power equality `p ^ m = a ^ n`. A specialized `eq_of_factorization_eq'` is added BTW to help with proof search. t-data 102/0 Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/Defs.lean,Mathlib/Data/Nat/Factorization/PrimePow.lean 3 1 ['github-actions'] nobody
30-79258
30 days ago
31-10214
1 month ago
31-10259
31 days
28198 Sebi-Kumar
author:Sebi-Kumar
feat(Analysis/InnerProductSpace/PiL2): Add instances for EuclideanSpace rank and EuclideanSpace being infinite Add an instance for `Fact (Module.finrank 𝕜 (EuclideanSpace 𝕜 (Fin n)) = n)` which is needed to apply [stereographic'](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Geometry/Manifold/Instances/Sphere.html#stereographic') to EuclideanSpace. Also add an instance for `Infinite (EuclideanSpace 𝕜 ι)` where `ι` is a nonempty fintype. I wasn't sure if these should go in separate pull requests, but they seemed similar enough to me. Thank you to Kenny Lau for the suggestions at [#mathlib4 > Instances for EuclideanSpace](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Instances.20for.20EuclideanSpace). --- To provide additional context, I am new to contributing to Mathlib, and I am doing so as a part of the Fields Undergraduate Summer Research Program at the University of Western Ontario under the supervision of Chris Kapulkin and Daniel Carranza. My goal is to contribute that the `n`-sphere is simply connected for `n > 1`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-analysis 6/0 Mathlib/Analysis/InnerProductSpace/PiL2.lean 1 1 ['github-actions'] urkud
assignee:urkud
30-67972
30 days ago
37-81208
1 month ago
37-81251
37 days
28072 kckennylau
author:kckennylau
feat(RingTheory/Valuation): make tactic rw_val_equiv Co-authored by Aaron Liu and Bhavik Mehta. A tactic to rewrite relations such as `max (v₁ x) (v₁ y) * v₁ z < 1` into `max (v₂ x) (v₂ y) * v₂ z < 1` , given `h : v₁.IsEquiv v₂`. Allowed relations are `≤`, `<`, `=`, `≠`. Allowed operations are: `0`, `1`, `v₁ r`, `⁻¹`, `^` (both `ℕ` and `ℤ`), `*`, `/`, `min`, `max`. Examples: ```lean example {R Γ₁ Γ₂ : Type} [Ring R] [LinearOrderedCommMonoidWithZero Γ₁] [LinearOrderedCommMonoidWithZero Γ₂] {v₁ : Valuation R Γ₁} {v₂ : Valuation R Γ₂} (h : v₁.IsEquiv v₂) {y z : R} : {x | v₁ x ^ 2 * min (v₁ y) (v₁ z) ≤ 1} = {x | v₂ x ^ 2 * min (v₂ y) (v₂ z) ≤ 1} := by rw_val_equiv h ``` It is also possible to use `←` to rewrite in the opposite direction, and to use `at h1 h3 ⊢` to specify which hypotheses (and/or goal) to rewrite, similar to the syntax of `rw`. There is also `rwa_val_equiv` to work like `rwa`. --- Zulip: [#Is there code for X? > Tactics for comparing equivalent valuations](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Tactics.20for.20comparing.20equivalent.20valuations) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory 455/13 Mathlib/RingTheory/Valuation/Basic.lean,MathlibTest/Simproc/ValEquiv.lean 2 34 ['b-mehta', 'eric-wieser', 'github-actions', 'kckennylau', 'pechersky', 'plp127'] erdOne
assignee:erdOne
29-67987
29 days ago
40-3279
1 month ago
40-64181
40 days
28191 kckennylau
author:kckennylau
feat(Logic): tag Injective, Surjective, and Bijective with fun_prop --- Zulip: * [#Is there code for X? > surjective is not funprop!](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/surjective.20is.20not.20funprop!) * [#mathlib4 > `fun_prop` for Injective/Surjective/Bijective?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60fun_prop.60.20for.20Injective.2FSurjective.2FBijective.3F) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 16/0 Mathlib/Tactic/FunProp.lean 1 3 ['github-actions', 'grunweg', 'kckennylau'] alexjbest
assignee:alexjbest
29-67985
29 days ago
37-18096
1 month ago
37-82704
37 days
28125 nonisomorphiclinearmap
author:nonisomorphiclinearmap
feat(Combinatorics): basic definition of simplicial complexes This PR introduces the basic definition of a finite (abstract) simplicial complex, located in Mathlib/Combinatorics/SimplicialComplex/Basic.lean. --- This is our first contribution to mathlib. This work was done as part of the Fields Institute Summer Undergraduate Program on formalization in topological combinatorics. Eventually, we aim to formalize Lovasz's proof of the Kneser Conjecture and this is a small stepping stone in that direction. Some other commits will shortly depend on this one. We would like to acknowledge the Fields Institute for Research in Mathematical Sciences for their sponsorship. We would also like to thank our supervisors, Professor Chris Kapulkin and Mr. Daniel Carranza, for their guidance and support throughout this project. We would also like to thank our group members Tom Lindquist and Quang Minh Nguyen for our fruitful discussions. new-contributor t-combinatorics 374/0 Mathlib.lean,Mathlib/Combinatorics/SimplicialComplex/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Category.lean,Mathlib/Combinatorics/SimplicialComplex/FacePoset.lean,Mathlib/Combinatorics/SimplicialComplex/Hom.lean 5 1 ['github-actions'] awainverse
assignee:awainverse
28-67995
28 days ago
40-64
1 month ago
40-106
40 days
28153 kckennylau
author:kckennylau
feat(Simproc): Simproc for explicit diagonal matrices ```lean example : (diagonal ![37, -1] : Matrix (Fin 2) (Fin 2) ℤ) = !![37, 0; 0, -1] := by simp ``` --- Shares code with #28148. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 114/0 Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/Matrix.lean,scripts/noshake.json 4 1 ['github-actions'] alexjbest
assignee:alexjbest
28-67993
28 days ago
39-6335
1 month ago
39-6383
39 days
28186 Sebi-Kumar
author:Sebi-Kumar
feat(Topology/Homotopy/Path): Add IsEquiv instance for Path.Homotopic Add `instance : IsEquiv (Path x₀ x₁) Homotopic` to the library. Allow use of lemmas like `of_eq` when proving two paths are homotopic. --- To provide additional context, I am relatively new to contributing to Mathlib, and I am doing so as a part of the Fields Undergraduate Summer Research Program hosted at the University of Western Ontario and supervised by Chris Kapulkin and Daniel Carranza. My goal is to prove that the `n`-sphere is simply connected for `n > 1`. Also, I am not super familiar with `IsEquiv` and when it should/shouldn't be used. I just wanted to use a lemma like `Path.Homotopic.of_eq` at one point while working on my code, and thought this was the best way to add such a result to the library. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-topology 5/0 Mathlib/Topology/Homotopy/Path.lean 1 4 ['Sebi-Kumar', 'github-actions', 'kckennylau'] PatrickMassot
assignee:PatrickMassot
28-67992
28 days ago
38-12922
1 month ago
38-12967
38 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-ring-theory 172/0 Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Integers.lean 2 3 ['JovanGerb', 'github-actions', 'mathlib4-merge-conflict-bot'] mariainesdff
assignee:mariainesdff
27-68004
27 days ago
40-3927
1 month ago
72-64844
72 days
28352 agjftucker
author:agjftucker
feat(Analysis): add three little theorems relating argument to image These relate argument to image under a continuous function, given a Prop that eventually holds on a product of filters in domain and codomain. In fact the second pair of statements concern a segment whose end-points are the image. They should prove useful in PRs 26300 and 26985. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 28/3 Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Order/Filter/Prod.lean 2 1 ['github-actions'] sgouezel
assignee:sgouezel
27-67998
27 days ago
35-6301
1 month ago
35-13489
35 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 t-meta 61/0 Mathlib/Data/Rat/Floor.lean,MathlibTest/norm_num_ext.lean 2 6 ['Rob23oba', 'github-actions', 'grunweg'] Rob23oba
assignee:Rob23oba
27-24708
27 days ago
27-24708
27 days ago
83-39192
83 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 350/0 Mathlib.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/NormNum/NormNumI.lean,MathlibTest/norm_numI.lean 5 47 ['Whysoserioushah', 'dupuisf', 'eric-wieser', 'github-actions', 'hrmacbeth'] robertylewis
assignee:robertylewis
27-21398
27 days ago
62-5714
2 months ago
62-10028
62 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 t-analysis 65/0 Mathlib.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Calculus/IteratedDeriv/ConvergenceOnBall.lean 3 5 ['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'vasnesterov'] urkud
assignee:urkud
25-79983
25 days ago
28-18786
28 days ago
75-3659
75 days
28378 euprunin
author:euprunin
chore(Algebra): golf entire `eq_lift_comp_mkRingHom` and `eq_liftAlgHom_comp_mkAlgHom` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
4/8 Mathlib/Algebra/RingQuot.lean 1 1 ['github-actions'] mariainesdff
assignee:mariainesdff
25-68002
25 days ago
34-55847
1 month ago
34-55889
34 days
28399 Ruben-VandeVelde
author:Ruben-VandeVelde
feat: ring-theoretic fractions in Rat --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory 47/0 Mathlib.lean,Mathlib/RingTheory/Localization/Rat.lean 2 1 ['github-actions'] robertylewis
assignee:robertylewis
25-68001
25 days ago
34-40937
1 month ago
34-40981
34 days
28473 EtienneC30
author:EtienneC30
feat: toLp and ofLp are analytic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 42/0 Mathlib.lean,Mathlib/Analysis/Analytic/WithLp.lean 2 1 ['github-actions'] hrmacbeth
assignee:hrmacbeth
25-67998
25 days ago
33-22172
1 month ago
33-22153
33 days
27990 kckennylau
author:kckennylau
feat(Counterexamples): a nontrivial valuation with discrete topology This file constructs a valuation on `K[X]` satisfying `IsValuativeTopology K[X] ∧ Nonempty (valuation K[X]).RankOne ∧ IsNontrivial K[X] ∧ DiscreteTopology K[X]`, and proves that `IsValuativeTopology F ∧ IsNontrivial F ∧ DiscreteTopology F` is not possible if `F` is a field. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory 172/0 Counterexamples.lean,Counterexamples/DiscreteTopologyWithNontrivialValuation.lean 2 n/a ['github-actions', 'grunweg', 'kckennylau', 'pechersky'] nobody
25-53086
25 days ago
unknown
unknown
28812 yury-harmonic
author:yury-harmonic
feat(PNat/Factors): add attrs and lemmas --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor 42/0 Mathlib/Data/PNat/Factors.lean 1 1 ['github-actions'] nobody
25-17200
25 days ago
25-17356
25 days ago
25-17393
25 days
27245 rirarika
author:rirarika
feat: multivariate polynomial ring properties about irreducibility --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
88/0 Mathlib.lean,Mathlib/Algebra/MvPolynomial/Irreducible.lean 2 5 ['alreadydone', 'github-actions', 'mbkybky'] alreadydone
assignee:alreadydone
25-14389
25 days ago
61-42835
1 month ago
61-42875
61 days
25907 mans0954
author:mans0954
feat: low order roots of unity This PR continues the work from #25470. Original PR: https://github.com/leanprover-community/mathlib4/pull/25470 t-algebra
label:t-algebra$
182/0 Mathlib/Algebra/CharP/Invertible.lean,Mathlib/RingTheory/RootsOfUnity/Complex.lean 2 2 ['github-actions', 'mans0954'] kim-em
assignee:kim-em
25-14351
25 days ago
94-27042
3 months ago
94-27088
94 days
28195 gasparattila
author:gasparattila
feat: separating a convex compact set and its neighborhood with a polytope --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-analysis 26/1 Mathlib/Analysis/Normed/Affine/Convex.lean 1 2 ['FrankieNC', 'github-actions'] sgouezel
assignee:sgouezel
24-67975
24 days ago
37-83909
1 month ago
37-83960
37 days
28531 Ruben-VandeVelde
author:Ruben-VandeVelde
chore: remove Cardinal imports from Topology.Algebra.InfiniteSum.Group --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 51/15 Mathlib.lean,Mathlib/Analysis/BoxIntegral/UnitPartition.lean,Mathlib/Analysis/Normed/Group/Pointwise.lean,Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/Const.lean,Mathlib/Topology/Algebra/InfiniteSum/Group.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean,Mathlib/Topology/Algebra/InfiniteSum/Real.lean,Mathlib/Topology/Category/Stonean/Basic.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean,Mathlib/Topology/Instances/NNReal/Lemmas.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/MetricSpace/Thickening.lean,Mathlib/Topology/PartitionOfUnity.lean 16 4 ['Ruben-VandeVelde', 'YaelDillies', 'github-actions'] TwoFX
assignee:TwoFX
24-67967
24 days ago
31-78819
1 month ago
31-78799
31 days
28766 yury-harmonic
author:yury-harmonic
feat(Nat/Factorial): add tail-recursive versions --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor 58/1 Mathlib/Data/Nat/Factorial/Basic.lean 1 1 ['github-actions', 'plp127'] nobody
24-67279
24 days ago
26-47367
26 days ago
26-47414
26 days
28837 yury-harmonic
author:yury-harmonic
feat(ValMinAbs): add lemmas --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 24/6 Mathlib/Data/ZMod/ValMinAbs.lean 1 1 ['github-actions'] nobody
24-45155
24 days ago
24-45165
24 days ago
24-45200
24 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$
36/0 Mathlib/Analysis/Normed/Operator/LinearIsometry.lean 1 24 ['Ruben-VandeVelde', 'dagurtomas', 'eric-wieser', 'github-actions', 'jcreedcmu', 'themathqueen'] dagurtomas
assignee:dagurtomas
23-80713
23 days ago
23-80713
23 days ago
53-63021
53 days
28132 dupuisf
author:dupuisf
feat: preliminary `grind` tags for `IsUnit` This PR adds preliminary `grind` tags for the `IsUnit` predicate. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
61/17 Mathlib/Algebra/Group/Action/Units.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Ring/Units.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean 6 2 ['github-actions', 'mathlib4-merge-conflict-bot'] kim-em
assignee:kim-em
23-67972
23 days ago
32-64320
1 month ago
32-64301
32 days
28325 pechersky
author:pechersky
feat(WithZeroTopology): `locallyCompactSpace_iff_locallyFiniteOrder_units` On the way to golf/generalize the proof that locally compact valued fields have locally finite valuation groups as embodied in `Valued.integer.locallyFiniteOrder_units_mrange_of_isCompact_integer` ] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-order t-topology 160/2 Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean,Mathlib/Topology/Compactness/Compact.lean 3 1 ['github-actions'] PatrickMassot
assignee:PatrickMassot
23-67969
23 days ago
35-50185
1 month ago
35-52892
35 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$
20/1 Mathlib/Topology/Algebra/Valued/WithVal.lean 1 7 ['alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot', 'pechersky', 'smmercuri'] alreadydone
assignee:alreadydone
23-60909
23 days ago
23-61025
23 days ago
57-27304
57 days
26988 YaelDillies
author:YaelDillies
feat(Rel): more API Some of this API already exists in `Topology.UniformSpace.Defs` but not spelled with `SetRel`, 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 182/8 Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Data/Rel.lean 2 2 ['github-actions', 'mathlib4-merge-conflict-bot'] nobody
23-50920
23 days ago
35-49017
1 month ago
68-23254
68 days
23835 chrisflav
author:chrisflav
feat(Topology): cardinality of connected components is bounded by cardinality of fiber We show that if `f : X → Y` is an open and closed map to `Y` and `Y` is connected, the number of connected components of `X` is bounded by the cardinality of the fiber of any point. In particular, if `Y` has finitely many connected components and `f` finite fibers, also `X` as finitely many connected components. From Pi1. --- - [x] depends on: #23849 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 242/1 Mathlib.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/SetTheory/Cardinal/Finite.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/Connected/CardComponents.lean,Mathlib/Topology/Connected/Clopen.lean 6 5 ['chrisflav', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] grunweg
assignee:grunweg
22-68001
22 days ago
30-25150
30 days ago
32-19181
32 days
27824 ChrisHughes24
author:ChrisHughes24
feat(Calculus): exists_gt_of_deriv_pos and variants --- I created a new file for this as I anticipate there will be many lemmas relating derivatives and monotonicity in future. Some lemmas relating deriviatives to monotonicity are already in mathlib and should maybe moved to the file (e.g. docs#HasDerivWithinAt.nonneg_of_monotoneOn). I stated them in as much generality as I could, copying the generality of `HasDerivWithinAt.nonneg_of_monotoneOn`. - [x] depends on: #28039 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 85/0 Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Order.lean 2 29 ['ChrisHughes24', 'EtienneC30', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] hrmacbeth
assignee:hrmacbeth
22-67998
22 days ago
33-11798
1 month ago
37-29493
37 days
28445 mitchell-horner
author:mitchell-horner
feat: `one_sub_one_div_cast_*` theorems --- Needed for a proof of the Erdős-Stone-Simonovits theorem in future PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data t-algebra t-number-theory
label:t-algebra$
18/0 Mathlib/Data/Nat/Cast/Order/Field.lean 1 1 ['github-actions'] nobody
22-40659
22 days ago
22-40659
22 days ago
33-79176
33 days
28350 themathqueen
author:themathqueen
feat(Algebra/Module/LinearMap): `range (f.smulRight x) = span {x}` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
55/8 Mathlib.lean,Mathlib/Algebra/Module/LinearMap/Lemmas.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean 4 3 ['Ruben-VandeVelde', 'github-actions', 'themathqueen'] dagurtomas
assignee:dagurtomas
22-36396
22 days ago
22-36396
22 days ago
35-16249
35 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'] adomani
assignee:adomani
22-16985
22 days ago
66-48209
2 months ago
66-80063
66 days
25292 YaelDillies
author:YaelDillies
feat: the `ConvexCone` generated by a set Define `ConvexCone.copy` and `ConvexCone.hull` and use them to golf the `CompleteLattice` instance. From Toric --- - [x] depends on: #25291 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-convex-geometry toric 94/35 Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Geometry/Convex/Cone/Basic.lean 2 8 ['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
21-81087
21 days ago
52-33530
1 month ago
89-71853
89 days
28768 yury-harmonic
author:yury-harmonic
feat(Data/Nat): define `Nat.nthRoot` Define `Nat.nthRoot n a` to be the `n`th root of a natural number `a`. --- This is a dependency of a `norm_num` plugin that can handle `(8 : Real) ^ (2 / 3 : Real)`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor 218/0 Mathlib.lean,Mathlib/Data/Nat/NthRoot/Defs.lean,Mathlib/Data/Nat/NthRoot/Lemmas.lean 3 16 ['b-mehta', 'eric-wieser', 'github-actions', 'j-loreaux', 'yury-harmonic'] nobody
21-80224
21 days ago
25-53533
25 days ago
26-8216
26 days
27992 staroperator
author:staroperator
feat(Algebra): cancellation inheritance This PR: 1. adds `Is{Left,Right}Cancel{Add,Mul,MulZero}` instances for `{Add,Mul,MulZero}MemClass` etc. 2. duplicates such instances for `Subsemiring` and `Subalgebra`, following #27955 (which is for `Submonoid` and `Submodule`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
74/1 Mathlib.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/GroupWithZero/Submonoid/CancelMulZero.lean,Mathlib/Algebra/Module/Submodule/Defs.lean,Mathlib/Algebra/Ring/Subsemiring/Defs.lean 7 7 ['Vierkantor', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'staroperator'] alreadydone
assignee:alreadydone
21-67998
21 days ago
36-76660
1 month ago
43-424
43 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 6 ['IvanRenison', 'github-actions', 'vlad902'] kmill
assignee:kmill
21-30236
21 days ago
113-73762
3 months ago
113-73812
113 days
26914 quangvdao
author:quangvdao
feat(Data/PFunctor/Univariate): more definitions for univariate `PFunctor` This PR defines several basic definitions of `PFunctor`, including zero, one, constants, monomials, coproduct (sum), product, sigma, pi, tensor product, universe lifting, and equivalence. We also add: (1) simple lemmas connecting the basic definitions, (2) an automatically derived ext lemma for `PFunctor` via `@[ext]` attribute Some things I'm not clear on: - I define `HAdd` and `HMul` instances for coproduct and product of poly functors having different universe levels. Should I also define `Add` and `Mul` instances for poly functors having the same universe level? - Is it ok to define notation for tensor product, i.e. `@[inherit_doc] scoped infixr:80 " ⊗ " => tensor`? I'm worried it might clash with other notation. - Need a double-check on the priority of notation. Some future definitions to add: - Various equivalences arising from arithmetic identities, e.g., `P + 0 ≃ₚ P`. - Definitions of Lenses and Charts (each of them will be a file or even a folder) - Exponential objects (corresponding to both `prod` and `tensor`) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 144/5 Mathlib/Data/PFunctor/Univariate/Basic.lean 1 19 ['alexkeizer', 'eric-wieser', 'github-actions', 'quangvdao'] eric-wieser
assignee:eric-wieser
21-14952
21 days ago
70-69059
2 months ago
70-69101
70 days
23238 YaelDillies
author:YaelDillies
feat: extended floor and ceil My motivation for this is to prove `ENat.toENNReal (⨆ i, f i) = ⨆ i, ENat.toENNReal (f i)` and `ENat.toENNReal (⨅ i, f i) = ⨅ i, ENat.toENNReal (f i)`. Kalle Kytölä independently needs this for his formalisation of statistical physics. From MiscYD --- - [x] depends on: #24781 - [x] depends on: #24782 See #15269 for a past attempt. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
235/0 Mathlib.lean,Mathlib/Algebra/Order/Floor/Extended.lean 2 25 ['YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'kkytola', 'mathlib4-dependent-issues-bot', 'urkud'] alreadydone
assignee:alreadydone
21-9228
21 days ago
129-6593
4 months ago
176-58808
176 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$
73/0 Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean 2 6 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] alreadydone
assignee:alreadydone
21-1913
21 days ago
21-1933
21 days ago
70-73345
70 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$
205/25 Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean 2 27 ['github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky'] alreadydone
assignee:alreadydone
21-1781
21 days ago
21-1802
21 days ago
63-65289
63 days
22662 plp127
author:plp127
feat: Localization.Away.lift (computably) This PR adds `Localization.Away.lift'` and `Localization.Away.lift`, computable alternatives to `Localization.awayLift`. --- - [x] depends on: #24791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
74/0 Mathlib/RingTheory/Localization/Away/Basic.lean 1 17 ['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'plp127', 'vihdzp'] mariainesdff
assignee:mariainesdff
20-67758
20 days ago
128-72373
4 months ago
194-72352
194 days
28630 Antidite
author:Antidite
feat(Archive/Imo): right isosceles configuration in the complex plane feat(Archive/Imo): right isosceles configuration in the complex plane This adds `Archive/Imo/Imo1975Q3.lean`, formalizing a triangle configuration with points A=0, B=1, C=z and auxiliary points R, P, Q built via complex rotations and sine-based scale factors. Main results: * `angle_and_distance`: ∠QRP = π/2 and dist Q R = dist R P. * Key identity `QRP_rot90`: (Q z).z − R.z = e^{iπ/2} · ((P z).z − R.z). Design/Style: * Minimal imports; module docstring; semantic lemma names; all definitions and theorems live under the namespace `IMO.TriangleConfig`. Moves: - (none) Deletions: - (none) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) IMO new-contributor 196/0 Archive.lean,Archive/Imo/Imo1975Q3.lean 2 36 ['Antidite', 'LLaurance', 'github-actions', 'jsm28'] jsm28
assignee:jsm28
20-11790
20 days ago
29-38953
29 days ago
29-38994
29 days
27392 Paul-Lez
author:Paul-Lez
feat(Tactic/SimpUtils): add simproc finding commands This PR adds some commands to allow users to find simprocs/dsimprocs/simp theorems that match on a given pattern. Thanks to Robin Arnez for telling me about `simprocDeclExt` :) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 690/0 Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SimpUtils.lean,MathlibTest/SimpUtils.lean 4 9 ['Paul-Lez', 'eric-wieser', 'github-actions', 'kmill'] robertylewis
assignee:robertylewis
20-8888
20 days ago
42-82027
1 month ago
44-82694
44 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 10 ['JovanGerb', 'github-actions', 'grunweg', 'lecopivo', 'peabrainiac'] grunweg
assignee:grunweg
19-39620
19 days ago
81-60836
2 months ago
81-65584
81 days
26240 grunweg
author:grunweg
perf(CommandLinterLinter): use Substring more Probably, these changes make little difference, but let's find out. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-linter RFC 14/15 Mathlib/Tactic/Linter/CommandStart.lean 1 5 ['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] joneugster
assignee:joneugster
19-39376
19 days ago
88-76939
2 months ago
88-81547
88 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-algebraic-topology t-category-theory 476/114 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 19 ['dagurtomas', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier'] dagurtomas
assignee:dagurtomas
19-31161
19 days ago
19-31161
19 days ago
86-9633
86 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 44/0 Mathlib/MeasureTheory/Constructions/UnitInterval.lean,Mathlib/Topology/UnitInterval.lean 2 6 ['gaetanserre', 'github-actions', 'mathlib4-merge-conflict-bot', 'ocfnash'] ocfnash
assignee:ocfnash
19-16511
19 days ago
24-18230
24 days ago
50-9230
50 days
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 8/0 Mathlib/Combinatorics/SimpleGraph/Metric.lean 1 5 ['b-mehta', 'github-actions', 'vlad902'] awainverse
assignee:awainverse
19-14515
19 days ago
54-25651
1 month ago
54-25746
54 days
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 3 ['github-actions', 'mathlib4-merge-conflict-bot'] awainverse
assignee:awainverse
19-13668
19 days ago
19-14790
19 days ago
49-29461
49 days
27433 YaelDillies
author:YaelDillies
refactor: make `⇑e⁻¹ = e.symm` simp From BrauerGroup and ClassFieldTheory --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 217/256 Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Data/Fintype/Perm.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/GroupTheory/Perm/Basic.lean,Mathlib/GroupTheory/Perm/Centralizer.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/GroupTheory/Perm/Finite.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/GroupTheory/Perm/Support.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/Logic/Equiv/Set.lean 16 3 ['eric-wieser', 'github-actions'] dwrensha
assignee:dwrensha
18-68013
18 days ago
31-21743
1 month ago
31-53111
31 days
27672 b-reinke
author:b-reinke
feat(GroupTheory/FreeGroup): add definition of cyclically reduced words This PR adds the definition of cyclically reduced words for free groups. It is a part of a series of PR on the theory of cyclically reduced words. Upstreamed from the [EquationalTheories](https://github.com/teorth/equational_theories) project. - [ ] depends on: #25966 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-group-theory 72/0 Mathlib.lean,Mathlib/GroupTheory/FreeGroup/CyclicallyReduced.lean 2 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] tb65536
assignee:tb65536
18-68012
18 days ago
34-16778
1 month ago
34-19908
34 days
28560 euprunin
author:euprunin
chore(Combinatorics/Quiver): golf entire `lift_spec` using `rfl` ---
Show trace profiling of lift_spec: <10 ms before, <10 ms after 🎉 ### Trace profiling of `lift_spec` before PR 28560 ```diff diff --git a/Mathlib/Combinatorics/Quiver/Symmetric.lean b/Mathlib/Combinatorics/Quiver/Symmetric.lean index 33e371b283..76a3371b36 100644 --- a/Mathlib/Combinatorics/Quiver/Symmetric.lean +++ b/Mathlib/Combinatorics/Quiver/Symmetric.lean @@ -164,6 +164,7 @@ def lift [HasReverse V'] (φ : Prefunctor V V') : | Sum.inl g => φ.map g | Sum.inr g => reverse (φ.map g) +set_option trace.profiler true in theorem lift_spec [HasReverse V'] (φ : Prefunctor V V') : Symmetrify.of.comp (Symmetrify.lift φ) = φ := by fapply Prefunctor.ext ``` ``` ✔ [147/147] Built Mathlib.Combinatorics.Quiver.Symmetric (1.3s) Build completed successfully (147 jobs). ``` ### Trace profiling of `lift_spec` after PR 28560 ```diff diff --git a/Mathlib/Combinatorics/Quiver/Symmetric.lean b/Mathlib/Combinatorics/Quiver/Symmetric.lean index 33e371b283..3adf874946 100644 --- a/Mathlib/Combinatorics/Quiver/Symmetric.lean +++ b/Mathlib/Combinatorics/Quiver/Symmetric.lean @@ -164,13 +164,10 @@ def lift [HasReverse V'] (φ : Prefunctor V V') : | Sum.inl g => φ.map g | Sum.inr g => reverse (φ.map g) +set_option trace.profiler true in theorem lift_spec [HasReverse V'] (φ : Prefunctor V V') : Symmetrify.of.comp (Symmetrify.lift φ) = φ := by - fapply Prefunctor.ext - · rintro X - rfl - · rintro X Y f - rfl + tauto theorem lift_reverse [h : HasInvolutiveReverse V'] (φ : Prefunctor V V') {X Y : Symmetrify V} (f : X ⟶ Y) : ``` ``` ✔ [147/147] Built Mathlib.Combinatorics.Quiver.Symmetric (1.2s) Build completed successfully (147 jobs). ```
--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)
t-combinatorics 2/6 Mathlib/Combinatorics/Quiver/Symmetric.lean 1 1 ['github-actions'] awainverse
assignee:awainverse
18-68006
18 days ago
31-9861
1 month ago
31-9908
31 days
28574 euprunin
author:euprunin
chore(Topology/Category): golf entire `finiteCoproduct.ι_desc_apply`, `piIsoPi_hom_apply`, `prodIsoProd_hom_apply` and `pullbackIsoProdSubtype_hom_apply` using `tauto` and `rfl` ---
Show trace profiling of finiteCoproduct.ι_desc_apply: 15 ms before, 25 ms after ### Trace profiling of `finiteCoproduct.ι_desc_apply` before PR 28574 ```diff diff --git a/Mathlib/Topology/Category/CompHausLike/Limits.lean b/Mathlib/Topology/Category/CompHausLike/Limits.lean index 493c277fec..216c5888f2 100644 --- a/Mathlib/Topology/Category/CompHausLike/Limits.lean +++ b/Mathlib/Topology/Category/CompHausLike/Limits.lean @@ -109,6 +109,7 @@ lemma finiteCoproduct.ι_injective (a : α) : Function.Injective (finiteCoproduc lemma finiteCoproduct.ι_jointly_surjective (R : finiteCoproduct X) : ∃ (a : α) (r : X a), R = finiteCoproduct.ι X a r := ⟨R.fst, R.snd, rfl⟩ +set_option trace.profiler true in lemma finiteCoproduct.ι_desc_apply {B : CompHausLike P} {π : (a : α) → X a ⟶ B} (a : α) : ∀ x, finiteCoproduct.desc X π (finiteCoproduct.ι X a x) = π a x := by intro x ``` ``` ℹ [985/985] Built Mathlib.Topology.Category.CompHausLike.Limits (1.9s) info: Mathlib/Topology/Category/CompHausLike/Limits.lean:113:0: [Elab.command] [0.011940] theorem ι_desc_apply {B : CompHausLike P} {π : (a : α) → X a ⟶ B} (a : α) : ∀ x, finiteCoproduct.desc X π (finiteCoproduct.ι X a x) = π a x := by intro x change (ι X a ≫ desc X π) _ = _ simp only [ι_desc] [Elab.definition.header] [0.011212] CompHausLike.finiteCoproduct.ι_desc_apply [Elab.step] [0.010053] expected type: Sort ?u.7530, term ∀ x, finiteCoproduct.desc X π (finiteCoproduct.ι X a x) = π a x info: Mathlib/Topology/Category/CompHausLike/Limits.lean:113:0: [Elab.command] [0.012175] theorem finiteCoproduct.ι_desc_apply {B : CompHausLike P} {π : (a : α) → X a ⟶ B} (a : α) : ∀ x, finiteCoproduct.desc X π (finiteCoproduct.ι X a x) = π a x := by intro x change (ι X a ≫ desc X π) _ = _ simp only [ι_desc] info: Mathlib/Topology/Category/CompHausLike/Limits.lean:113:0: [Elab.command] [0.012211] lemma finiteCoproduct.ι_desc_apply {B : CompHausLike P} {π : (a : α) → X a ⟶ B} (a : α) : ∀ x, finiteCoproduct.desc X π (finiteCoproduct.ι X a x) = π a x := by intro x change (ι X a ≫ desc X π) _ = _ simp only [ι_desc] info: Mathlib/Topology/Category/CompHausLike/Limits.lean:113:0: [Elab.async] [0.015416] elaborating proof of CompHausLike.finiteCoproduct.ι_desc_apply [Elab.definition.value] [0.014903] CompHausLike.finiteCoproduct.ι_desc_apply [Elab.step] [0.014576] intro x change (ι X a ≫ desc X π) _ = _ simp only [ι_desc] [Elab.step] [0.014564] intro x change (ι X a ≫ desc X π) _ = _ simp only [ι_desc] [Elab.step] [0.011699] change (ι X a ≫ desc X π) _ = _ Build completed successfully (985 jobs). ``` ### Trace profiling of `finiteCoproduct.ι_desc_apply` after PR 28574 ```diff diff --git a/Mathlib/Topology/Category/CompHausLike/Limits.lean b/Mathlib/Topology/Category/CompHausLike/Limits.lean index 493c277fec..b70ed614b6 100644 --- a/Mathlib/Topology/Category/CompHausLike/Limits.lean +++ b/Mathlib/Topology/Category/CompHausLike/Limits.lean @@ -109,11 +109,10 @@ lemma finiteCoproduct.ι_injective (a : α) : Function.Injective (finiteCoproduc lemma finiteCoproduct.ι_jointly_surjective (R : finiteCoproduct X) : ∃ (a : α) (r : X a), R = finiteCoproduct.ι X a r := ⟨R.fst, R.snd, rfl⟩ +set_option trace.profiler true in lemma finiteCoproduct.ι_desc_apply {B : CompHausLike P} {π : (a : α) → X a ⟶ B} (a : α) : ∀ x, finiteCoproduct.desc X π (finiteCoproduct.ι X a x) = π a x := by - intro x - change (ι X a ≫ desc X π) _ = _ - simp only [ι_desc] + tauto instance : HasCoproduct X where exists_colimit := ⟨finiteCoproduct.cofan X, finiteCoproduct.isColimit X⟩ diff --git a/Mathlib/Topology/Category/TopCat/Limits/Products.lean b/Mathlib/Topology/Category/TopCat/Limits/Products.lean index 0b74c2f6ee..353896fce8 100644 --- a/Mathlib/Topology/Category/TopCat/Limits/Products.lean +++ b/Mathlib/Topology/Category/TopCat/Limits/Products.lean @@ -62,9 +62,7 @@ theorem piIsoPi_inv_π_apply {ι : Type v} (α : ι → TopCat.{max v u}) (i : theorem piIsoPi_hom_apply {ι : Type v} (α : ι → TopCat.{max v u}) (i : ι) (x : (∏ᶜ α : TopCat.{max v u})) : (piIsoPi α).hom x i = (Pi.π α i :) x := by - have := piIsoPi_inv_π α i - rw [Iso.inv_comp_eq] at this - exact ConcreteCategory.congr_hom this x + tauto /-- The inclusion to the coproduct as a bundled continuous map. -/ abbrev sigmaι {ι : Type v} (α : ι → TopCat.{max v u}) (i : ι) : α i ⟶ TopCat.of (Σ i, α i) := by @@ -165,9 +163,7 @@ theorem prodIsoProd_hom_snd (X Y : TopCat.{u}) : theorem prodIsoProd_hom_apply {X Y : TopCat.{u}} (x : ↑(X ⨯ Y)) : (prodIsoProd X Y).hom x = ((Limits.prod.fst : X ⨯ Y ⟶ _) x, (Limits.prod.snd : X ⨯ Y ⟶ _) x) := by - ext - · exact ConcreteCategory.congr_hom (prodIsoProd_hom_fst X Y) x - · exact ConcreteCategory.congr_hom (prodIsoProd_hom_snd X Y) x + tauto @[reassoc (attr := simp), elementwise] theorem prodIsoProd_inv_fst (X Y : TopCat.{u}) : diff --git a/Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean b/Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean index 66049170b3..68b42db21b 100644 --- a/Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean +++ b/Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean @@ -110,9 +110,7 @@ theorem pullbackIsoProdSubtype_hom_apply {f : X ⟶ Z} {g : Y ⟶ Z} (pullbackIsoProdSubtype f g).hom x = ⟨⟨pullback.fst f g x, pullback.snd f g x⟩, by simpa using CategoryTheory.congr_fun pullback.condition x⟩ := by - apply Subtype.ext; apply Prod.ext - exacts [ConcreteCategory.congr_hom (pullbackIsoProdSubtype_hom_fst f g) x, - ConcreteCategory.congr_hom (pullbackIsoProdSubtype_hom_snd f g) x] + tauto theorem pullback_topology {X Y Z : TopCat.{u}} (f : X ⟶ Z) (g : Y ⟶ Z) : (pullback f g).str = ``` ``` ✔ [982/985] Built Mathlib.Topology.Category.TopCat.Limits.Products (2.7s) ✔ [983/985] Built Mathlib.Topology.Category.TopCat.Limits.Pullbacks (2.4s) ✔ [984/985] Built Mathlib.CategoryTheory.Extensive (4.3s) ℹ [985/985] Built Mathlib.Topology.Category.CompHausLike.Limits (3.0s) info: Mathlib/Topology/Category/CompHausLike/Limits.lean:113:0: [Elab.command] [0.033044] theorem ι_desc_apply {B : CompHausLike P} {π : (a : α) → X a ⟶ B} (a : α) : ∀ x, finiteCoproduct.desc X π (finiteCoproduct.ι X a x) = π a x := by tauto [Elab.definition.header] [0.031659] CompHausLike.finiteCoproduct.ι_desc_apply [Elab.step] [0.030394] expected type: Sort ?u.7530, term ∀ x, finiteCoproduct.desc X π (finiteCoproduct.ι X a x) = π a x [Elab.step] [0.030250] expected type: Sort ?u.7534, term finiteCoproduct.desc X π (finiteCoproduct.ι X a x) = π a x [Elab.step] [0.030242] expected type: Sort ?u.7534, term binrel% Eq✝ (finiteCoproduct.desc X π (finiteCoproduct.ι X a x)) (π a x) [Elab.step] [0.025815] expected type: , term finiteCoproduct.desc X π (finiteCoproduct.ι X a x) [Elab.step] [0.010204] expected type: (fun X ↦ ↑X.toTop) (finiteCoproduct X), term (finiteCoproduct.ι X a x) [Elab.step] [0.010186] expected type: (fun X ↦ ↑X.toTop) (finiteCoproduct X), term finiteCoproduct.ι X a x info: Mathlib/Topology/Category/CompHausLike/Limits.lean:113:0: [Elab.command] [0.033536] theorem finiteCoproduct.ι_desc_apply {B : CompHausLike P} {π : (a : α) → X a ⟶ B} (a : α) : ∀ x, finiteCoproduct.desc X π (finiteCoproduct.ι X a x) = π a x := by tauto info: Mathlib/Topology/Category/CompHausLike/Limits.lean:113:0: [Elab.command] [0.033652] lemma finiteCoproduct.ι_desc_apply {B : CompHausLike P} {π : (a : α) → X a ⟶ B} (a : α) : ∀ x, finiteCoproduct.desc X π (finiteCoproduct.ι X a x) = π a x := by tauto info: Mathlib/Topology/Category/CompHausLike/Limits.lean:113:0: [Elab.async] [0.025323] elaborating proof of CompHausLike.finiteCoproduct.ι_desc_apply [Elab.definition.value] [0.024806] CompHausLike.finiteCoproduct.ι_desc_apply [Elab.step] [0.024330] tauto [Elab.step] [0.024317] tauto [Elab.step] [0.024304] tauto Build completed successfully (985 jobs). ```
--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)
t-topology 4/15 Mathlib/Topology/Category/CompHausLike/Limits.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean 3 1 ['github-actions'] ADedecker
assignee:ADedecker
18-68005
18 days ago
31-9223
1 month ago
31-9263
31 days
29089 hrmacbeth
author:hrmacbeth
feat: field tactic This PR creates a `field` tactic, i.e. an analogue of `ring` but for fields -- a finishing tactic for equality goals in fields. It is basically `field_simp; ring1`, with a few tweaks for better error reporting! We could have done this at any point in the last five years, but since `field_simp` is more performant as of #28658, now seems like a good time. I propose that `field` be preferred to terminal `field_simp`/`field_simp; ring` from now on. I'll follow up with a PR ([preview](https://github.com/leanprover-community/mathlib4/commit/44c0136fb8650f57416733d0b336c60b338f3d99)) making this change widely across the library. In the current PR I also rewrote the docstrings of `field_simp` and friends to nudge users in this direction. Closes #4837 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 315/24 Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Field.lean,Mathlib/Tactic/FieldSimp.lean,MathlibTest/FieldSimp.lean 5 31 ['github-actions', 'grunweg', 'hrmacbeth'] grunweg
assignee:grunweg
18-48103
18 days ago
18-74336
18 days ago
18-75959
18 days
29014 ShreckYe
author:ShreckYe
feat(Data/List/Scan): some theorems that relate `scanl` with `foldl` I am not sure which is the best form of `getElem_scanl_eq_foldl_take` here, so I added several alternative forms. Feel free to remove any of them if necessary. t-data 35/0 Mathlib/Data/List/Scan.lean 1 9 ['ShreckYe', 'github-actions', 'themathqueen', 'vlad902'] nobody
18-42841
18 days ago
21-38088
21 days ago
21-38132
21 days
28891 joelriou
author:joelriou
feat(Analysis/Convex): functoriality of the standard simplex When `f : X → Y` is a map between finite types, and `S` is an ordered semiring, we define the maps `stdSimplex.map f : stdSimplex S X → stdSimplex S Y`. In the case `S := ℝ`, we show that these maps are continuous. In a future PR #28893, the definition of the topological simplex in `AlgebraicTopology` shall be refactored. --- - [x] depends on: #28869 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-convex-geometry 192/1 Mathlib.lean,Mathlib/Analysis/Convex/StdSimplex.lean,Mathlib/LinearAlgebra/Finsupp/Pi.lean,Mathlib/Topology/Algebra/Monoid/FunOnFinite.lean 4 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] nobody
18-13285
18 days ago
18-13285
18 days ago
18-14474
18 days
25899 pfaffelh
author:pfaffelh
feat(Topology/Compactness/CompactSystem): introduce compact Systems A compact system is a set systems with the property that, whenever a countable intersections of sets in the set system is empty, there is a finite subset of sets with empty intersection. These are needed e.g. in measure theory if one wants to show sigma-additivity of a set function on a ring. * Main result: The set of sets which are either compact and closed, or `univ`, is a compact system. * Introduce `Dissipate s x := ⋂ y ≤ x, s y` (Data/Set/Dissipate), which is parallel to Data/Set/Accumulate. Co-authored-by: Rémy Degenne remydegenne@gmail.com --- *This PR continues the work from #24541.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24541* t-topology 453/1 Mathlib.lean,Mathlib/Data/Set/Accumulate.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/Topology/Compactness/CompactSystem.lean 5 14 ['github-actions', 'pfaffelh', 'sgouezel'] PatrickMassot
assignee:PatrickMassot
17-67991
17 days ago
27-84692
27 days ago
69-8878
69 days
25902 pfaffelh
author:pfaffelh
feat: The finite product of semi-rings (in terms of measure theory) is a semi-ring. ~~Move results for rings (in terms of measure theory) to a separate file; was in Semiring.lean before.~~ For `∀ i ∈ s, IsSetSemiring (C i))`, the product `s.pi '' s.pi C` is a semiring. Prove two auxiliary lemmas in `Data.Set.Prod` needed on the way. --- *This PR continues the work from #22714.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/22714* large-import t-measure-probability 260/14 Mathlib/Data/Set/Pairwise/Lattice.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/MeasurableSpace/Pi.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/MeasureTheory/SetSemiring.lean 5 1 ['github-actions'] kex-y
assignee:kex-y
17-67990
17 days ago
29-78466
29 days ago
30-2259
30 days
28343 RemyDegenne
author:RemyDegenne
feat(Probability): Fernique's theorem for distributions that are invariant by rotation Let `μ` be a finite measure on a second-countable normed space `E` such that the product measure `μ.prod μ` on `E × E` is invariant by rotation of angle `-π/4`. Then there exists a constant `C > 0` such that the function `x ↦ exp (C * ‖x‖ ^ 2)` is integrable with respect to `μ`. The main application of this theorem will be for Gaussian measures. --- The PR is large, but is basically one big proof, so I don't think I can cut it at a meaningful place. - [x] depends on: #28342 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-measure-probability 617/0 Mathlib.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/Probability/Distributions/Fernique.lean,docs/references.bib 4 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] kex-y
assignee:kex-y
17-43561
17 days ago
29-48556
29 days ago
29-55832
29 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 457/77 Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Data/List/ProdSigma.lean,Mathlib/Tactic/Simproc/ExistsAndEq.lean,MathlibTest/Simproc/ExistsAndEq.lean 4 15 ['JovanGerb', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot', 'vasnesterov'] kmill
assignee:kmill
17-27599
17 days ago
17-81391
17 days ago
72-12529
72 days
28676 sun123zxy
author:sun123zxy
feat(NumberTheory/ArithmeticFunction): wrap `Nat.totient` as an `ArithmeticFunction` This wraps the Euler's totient function `Nat.totient` into a new `ArithmeticFunction` `ϕ`, with some basic identities such as `ϕ * ζ = id` and `μ * id = ϕ.` --- We use the notation `ϕ` to distinguish from `Nat.totient`'s notation `φ`, however this might be controversial. Suggestions are welcome! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import new-contributor t-number-theory 49/3 Mathlib/NumberTheory/ArithmeticFunction.lean 1 10 ['MichaelStollBayreuth', 'b-mehta', 'eric-wieser', 'github-actions', 'sun123zxy'] MichaelStollBayreuth
assignee:MichaelStollBayreuth
17-3913
17 days ago
28-55157
28 days ago
28-56125
28 days
25856 MichaelStollBayreuth
author:MichaelStollBayreuth
perf(Data.Real.Sqrt): make Real.sqrt irreducible We try to see what happens if we make Real.sqrt irreducible. There are cases where this makes unification very significantly faster, compare [#mathlib4 > Coercion triggers timeout @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Coercion.20triggers.20timeout/near/517177117). (Migrated manually from #24752) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated-from-branch t-data 7/5 Mathlib/Data/Real/Sqrt.lean 1 5 ['MichaelStollBayreuth', 'github-actions', 'j-loreaux', 'leanprover-bot'] ericrbg
assignee:ericrbg
16-82131
16 days ago
17-447
17 days ago
86-27043
86 days
25883 pfaffelh
author:pfaffelh
feat: introduce Gram matrices A Gram matrix has entry `⟪v i, v j⟫` at `i j : n`, where `v : n → α` is an `InnerProductSpace 𝕜 α`. Give this notion and show that Gram matrices are positive semi-definite. This will be used later in order to show that the covariance matrix for Brownian Motion is positive semi-definite. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *This PR continues the work from #24575.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24575* migrated-from-branch new-contributor t-analysis 142/2 Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramMatrix.lean,Mathlib/MeasureTheory/Function/L2Space.lean 3 38 ['EtienneC30', 'eric-wieser', 'github-actions', 'pfaffelh'] hrmacbeth
assignee:hrmacbeth
16-67969
16 days ago
27-84761
27 days ago
71-20370
71 days
28296 strihanje01
author:strihanje01
feat(Combinatorics/Additive/VerySmallDoubling): Hamidoune's Freiman-Kneser theorem for nonabelian groups add noncommutative Freiman-Kneser theorem for doubling less than 2-\epsilon --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import new-contributor t-combinatorics 339/3 Mathlib/Combinatorics/Additive/VerySmallDoubling.lean 1 14 ['YaelDillies', 'github-actions', 'strihanje01'] awainverse
assignee:awainverse
16-67967
16 days ago
27-24821
27 days ago
29-1668
29 days
28555 YaelDillies
author:YaelDillies
feat: pullback along an epi preserved under pullbacks is faithful From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric large-import t-category-theory 39/2 Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean 2 1 ['github-actions'] kim-em
assignee:kim-em
16-67965
16 days ago
31-11051
1 month ago
31-11308
31 days
25920 BoltonBailey
author:BoltonBailey
feat(Data/Finsupp/Basic): `Finsupp.optionElim'` Similar to how Finsupp.cons constructs a map Fin (n + 1) →₀ M from a map Fin n →₀ M, we define Finsupp.optionElim' to construct a map Option α →₀ M from a map α →₀ M, given an additional value for none. We base this on the new optionEquiv definition. As a function, it behaves as Option.elim', hence the name. We prove a variety of API lemmas, based on those for Finsupp.cons, to bring the definitions more in line with the contents of Data/Finsupp/Fin. We also refactor to a new file to help avoid a too-long file and make this more analogous to Finsupp.cons Original PR: https://github.com/leanprover-community/mathlib4/pull/13861 - [x] depends on: #26309 migrated-from-branch t-data 114/23 Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Data/Finsupp/Option.lean 2 15 ['BoltonBailey', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] eric-wieser
assignee:eric-wieser
16-47619
16 days ago
16-52665
16 days ago
81-23150
81 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$
65/0 Mathlib/FieldTheory/Galois/Basic.lean 1 7 ['github-actions', 'tb65536', 'xroblot'] Vierkantor
assignee:Vierkantor
16-37274
16 days ago
72-42919
2 months ago
72-42963
72 days
28452 plp127
author:plp127
feat: Define `ZMod.fintype` without cases Define `ZMod.fintype` without casing on `n` except inside the proof. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 2/3 Mathlib/Data/ZMod/Defs.lean 1 2 ['github-actions', 'jcommelin'] nobody
16-23117
16 days ago
33-63036
1 month ago
33-63079
33 days
27973 smmercuri
author:smmercuri
feat: the ring of integers of a `ℤₘ₀`-valued field is compact whenever it is a DVR and the residue field is finite This PR continues the work from #21844. Original PR: https://github.com/leanprover-community/mathlib4/pull/21844 large-import t-algebra
label:t-algebra$
54/2 Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean 2 1 ['github-actions'] dagurtomas
assignee:dagurtomas
15-67994
15 days ago
25-53043
25 days ago
36-11882
36 days
28602 gmcninch-tufts
author:gmcninch-tufts
feat(Algebra/Polynomial/Module): prove equivalence of a certain tensor product with PolynomialModule For a commutative ring `R` and an `R`-module `M`, construct an equivalence between the `R[X]`-modules `R[X] ⊗[R] M` and `PolynomialModule R M`. This equivalence enables application of some base-change results to `PolynomialModule R M` . --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
210/0 Mathlib.lean,Mathlib/Algebra/Polynomial/Module/TensorProduct.lean 2 1 ['github-actions'] jcommelin
assignee:jcommelin
15-67992
15 days ago
30-17068
30 days ago
30-17109
30 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 5 ['b-mehta', 'github-actions', 'grunweg', 'plp127'] b-mehta
assignee:b-mehta
15-10322
15 days ago
86-55164
2 months ago
86-69076
86 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 42/0 Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean 2 2 ['github-actions', 'vlad902'] kmill
assignee:kmill
15-10243
15 days ago
97-20179
3 months ago
97-20159
97 days
27238 alreadydone
author:alreadydone
feat(Algebra): IsDomain R[X] ↔ IsDomain R ∧ IsCancelAdd R --- - [x] depends on: #27241 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
133/1 Counterexamples.lean,Counterexamples/PolynomialIsDomain.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/GroupWithZero/TransferInstance.lean,Mathlib/Algebra/Opposites.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Opposites.lean 8 7 ['alreadydone', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] kim-em
assignee:kim-em
14-68002
14 days ago
25-72226
25 days ago
29-58016
29 days
28929 grunweg
author:grunweg
experiment: use `fun_prop` in Homeomorph Can we make the continuity auto-parameters use `fun_prop`? Or perhaps `first |fun_prop; |dsimp; fun_prop`? --- Compared to #13994, it seems this is a much smoother experience. I suspect the RefineDiscTree changes have helped (but that is pure speculation). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 13/5 Mathlib/MeasureTheory/Group/Measure.lean,Mathlib/Topology/Algebra/Algebra/Equiv.lean,Mathlib/Topology/Algebra/Constructions/DomMulAct.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/Homeomorph/Defs.lean 6 4 ['euprunin', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] PatrickMassot
assignee:PatrickMassot
14-67995
14 days ago
22-72273
22 days ago
22-77589
22 days
28887 alreadydone
author:alreadydone
feat(RingTheory): units are exactly non-zerodivisors in noncommutative Artinian rings --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory t-algebra
label:t-algebra$
70/24 Mathlib/RingTheory/Artinian/Algebra.lean,Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/Artinian/Ring.lean,Mathlib/RingTheory/IntegralClosure/IsIntegral/Basic.lean 4 2 ['github-actions', 'themathqueen'] mattrobball
assignee:mattrobball
14-67995
14 days ago
21-81576
21 days ago
23-65366
23 days
29281 plp127
author:plp127
docs: `Fin.natAdd_castLEEmb` Change the docstring of `Fin.natAdd_castLEEmb` which confused me when I read it so I rewrote it. PS. this doesn't really follow the naming convention since data should be in `camelCase` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 2/3 Mathlib/Data/Fin/Embedding.lean 1 1 ['github-actions'] nobody
14-64032
14 days ago
14-64038
14 days ago
14-64078
14 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 3 ['github-actions', 'mattrobball', 'xyzw12345'] mattrobball
assignee:mattrobball
14-42101
14 days ago
59-18925
1 month ago
59-18974
59 days
27244 xroblot
author:xroblot
feat(RingTheory/DedekindDomain): lifting an ideal in an extension is injective This PR develops some API for [FractionalIdeal.extendedHomₐ](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/FractionalIdeal/Extended.html#FractionalIdeal.extendedHom%E2%82%90) and in particular proves when it is an injective map. As a consequence, it deduces the fact that lifting an integral ideal in an extension of Dedekind domains is an injective map. Note: the import increase happens in a leaf file `Mathlib.RingTheory.FractionalIdeal.Extended` --- - [x] depends on: #28800 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory large-import 140/8 Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/Localization/Basic.lean 3 5 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'xroblot'] kbuzzard
assignee:kbuzzard
14-12883
14 days ago
14-24502
14 days ago
50-29088
50 days
28831 qawbecrdtey
author:qawbecrdtey
feat(Logic/Equiv/List): add `decodeList_encodeList_eq_self` and removed unnecessary linter options --- This is useful when we call `encode` and `decode` of a list to define a new `Encoder` involving `List`s. ```lean theorem decodeList_encodeList_eq_self (l : List α) : decodeList (encodeList l) = some l ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-logic 7/6 Mathlib/Logic/Equiv/List.lean 1 1 ['github-actions'] awainverse
assignee:awainverse
13-67999
13 days ago
24-62043
24 days ago
24-62081
24 days
28906 gasparattila
author:gasparattila
feat(Topology/Algebra/Module): `prod` and `coprod` as `ContinuousLinearEquiv`s --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-topology 36/5 Mathlib/Topology/Algebra/Module/LinearMapPiProd.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean 2 1 ['github-actions'] jcommelin
assignee:jcommelin
13-67998
13 days ago
23-8165
23 days ago
23-8202
23 days
29328 vlad902
author:vlad902
feat(SimpleGraph): graph isomorphism preserves `IsAcyclic`/`IsTree` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 21/2 Mathlib/Combinatorics/SimpleGraph/Acyclic.lean 1 2 ['github-actions', 'themathqueen'] nobody
13-50929
13 days ago
14-15
13 days ago
14-40
14 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 46/1 Mathlib/Combinatorics/Enumerative/Bell.lean 1 11 ['AntoineChambert-Loir', 'FlAmmmmING', 'eric-wieser', 'github-actions', 'kckennylau', 'madvorak'] awainverse
assignee:awainverse
13-50268
13 days ago
74-13394
2 months ago
74-13437
74 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 3 ['WangYiran01', 'github-actions'] b-mehta
assignee:b-mehta
13-46802
13 days ago
68-37954
2 months ago
68-37995
68 days
29307 harahu
author:harahu
doc: hyphenate attributive compound adjectives ending in "exact" Compound adjectives that are attributive (coming before their noun) should almost always be hyphenated in English. This PR covers such adjectives that are ending in "exact". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 144/144 Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Free.lean,Mathlib/Algebra/Homology/ConcreteCategory.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExactSequences.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/HomologySequence.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/DerivedCategory/SingleTriangle.lean,Mathlib/Algebra/Homology/HomologySequence.lean,Mathlib/Algebra/Homology/HomologySequenceLemmas.lean,Mathlib/Algebra/Homology/HomotopyCategory/DegreewiseSplit.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomologicalFunctor.lean,Mathlib/Algebra/Homology/HomotopyCategory/Pretriangulated.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Homology/LocalCohomology.lean,Mathlib/Algebra/Homology/ShortComplex/ExactFunctor.lean,Mathlib/Algebra/Homology/ShortComplex/ShortExact.lean,Mathlib/Algebra/Lie/Extension.lean,Mathlib/CategoryTheory/Abelian/DiagramLemmas/KernelCokernelComp.lean,Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/Basic.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/ModuleEmbedding/GabrielPopescu.lean,Mathlib/CategoryTheory/Functor/Flat.lean,Mathlib/CategoryTheory/Limits/ExactFunctor.lean,Mathlib/CategoryTheory/Limits/Preserves/Finite.lean,Mathlib/CategoryTheory/Limits/Preserves/Presheaf.lean,Mathlib/CategoryTheory/ObjectProperty/Extensions.lean,Mathlib/CategoryTheory/Preadditive/AdditiveFunctor.lean,Mathlib/CategoryTheory/Preadditive/LeftExact.lean,Mathlib/CategoryTheory/Shift/ShiftSequence.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/LeftExact.lean,Mathlib/CategoryTheory/Sites/MayerVietorisSquare.lean,Mathlib/CategoryTheory/Sites/NonabelianCohomology/H1.lean,Mathlib/CategoryTheory/Sites/Sheafification.lean,Mathlib/CategoryTheory/Triangulated/HomologicalFunctor.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/GroupTheory/MonoidLocalization/GrothendieckGroup.lean,Mathlib/LinearAlgebra/TensorProduct/RightExactness.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LongExactSequence.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LongExactSequence.lean,Mathlib/RingTheory/DedekindDomain/SelmerGroup.lean,Mathlib/RingTheory/Flat/CategoryTheory.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Finiteness.lean,Mathlib/RingTheory/Regular/IsSMulRegular.lean,Mathlib/Topology/Category/Profinite/Nobeling/Successor.lean 47 n/a ['github-actions'] nobody
13-44469
13 days ago
unknown
unknown
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/) t-algebra
label:t-algebra$
192/8 Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/Localization/Basic.lean 4 15 ['erdOne', 'github-actions', 'mathlib4-merge-conflict-bot', 'xroblot'] Vierkantor
assignee:Vierkantor
13-42839
13 days ago
13-42847
13 days ago
85-49700
85 days
27254 yuanyi-350
author:yuanyi-350
2025 imo problem3 - [x] depends on: #28788 - [x] depends on: #28790 - [x] depends on: #28829 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) IMO 231/0 Archive.lean,Archive/Imo/Imo2025Q3.lean,Mathlib/NumberTheory/Padics/PadicVal/Basic.lean 3 28 ['github-actions', 'jsm28', 'kbuzzard', 'leanprover-community-bot-assistant', 'madvorak', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen', 'wwylele', 'yuanyi-350'] jsm28
assignee:jsm28
13-34417
13 days ago
14-70083
14 days ago
48-44951
48 days
28561 euprunin
author:euprunin
chore(Data): golf entire `equivFunOnFintype_single`, `predAbove_right_zero`, `snoc_zero` and more using `rfl` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 25/88 Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/Take.lean,Mathlib/Data/Finmap.lean,Mathlib/Data/Finsupp/AList.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/PFunctor/Multivariate/W.lean,Mathlib/Data/PFunctor/Univariate/M.lean,Mathlib/Data/QPF/Multivariate/Constructions/Cofix.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Set/Piecewise.lean,Mathlib/Data/Set/Sups.lean,Mathlib/Data/TypeVec.lean,Mathlib/Data/Vector/Basic.lean,Mathlib/Data/Vector/Defs.lean 17 7 ['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot'] nobody
13-4415
13 days ago
13-4439
13 days ago
28-66070
28 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 86/0 Mathlib/Combinatorics/SimpleGraph/Bipartite.lean 1 1 ['github-actions'] b-mehta
assignee:b-mehta
12-67995
12 days ago
96-22344
3 months ago
96-22325
96 days
28546 Sfgangloff
author:Sfgangloff
feat(SymbolicDynamics): basic setup of Zd, full shift, cylinders, pat… # Symbolic dynamics on groups: core API and entropy along finite shapes This PR adds a **group-generic** foundation for symbolic dynamics over an arbitrary group `G`, together with convenient specializations for `ℤ` and `ℤ^d`. ## Summary of additions - **Full shift and shift action** - `abbrev FullShift (A G) := G → A` (inherits product topology from the Π-type). - Right shift `shift g x` with convention `(shift g x) h = x (h * g)`. - **Cylinders and topology** - `cylinder U x : Set (G → A)` for finite `U : Finset G`. - Cylinders are open under `[DiscreteTopology A]`; with a finite alphabet they are also closed. - Equality with dependent products: `cylinder U x = Set.pi (↑U) (fun i => ({x i} : Set A))`, enabling use of the `Set.pi` API. - **Patterns, occurrences, and subshifts** - `Pattern A G` with finite `support : Finset G` and `data : support → A`. - `Pattern.occursIn p x g` (occurrence at translate `g`) and the expected shift law. - `forbids F` and `Subshift A G` (closed, shift-invariant subsets). - `FixedSupport A G U` with an equivalence to `(U → A)` to obtain finiteness. - **Language on finite shapes and counting** - `languageOn X U`, `languageCardOn X U`, and `patternCountOn Y U`. - **Entropy along a shape sequence** - `limsupAtTop` (as an `sInf` of eventual upper bounds). - `entropyAlong X F hF := limsup (log (patternCountOn X (F n) + 1) / |F n|)` for any nonempty finite shapes `F : ℕ → Finset G` (the `+ 1` avoids `log 0`). - **Specializations** - `IntShapes`: segments `[-n,n]` on `Multiplicative ℤ`, with `entropy_Z`. - `ZdShapes`: boxes `[-n,n]^d` on `ℤ^d` (as functions `Fin d → ℤ`), with `entropy_Zd`. ## Mathematical remarks - The API is **shape-parametric**: entropy is defined along user-provided finite shapes. - On **amenable** groups, using a **Følner** sequence yields a canonical value (Ornstein–Weiss). This PR does not assume amenability; the family of shapes is an explicit input. ## Motivation Provide a clean, reusable base for symbolic dynamics on groups in mathlib. ## Future work - Add a Følner predicate and prove shape-independence / limit existence on amenable groups. - Expand the `ℤ`/`ℤ^d` toolkit (alternative shapes, mixing, factors). - Develop 1D theory and, longer-term, multidimensional SFT results (e.g. along the lines of Hochman–Meyerovitch). new-contributor t-dynamics 513/0 Mathlib.lean,Mathlib/Dynamics/SymbolicDynamics/Basic.lean,Mathlib/Dynamics/SymbolicDynamics/EntropyFinitelyGenerated.lean 3 14 ['Sfgangloff', 'eric-wieser', 'github-actions', 'kckennylau', 'sgouezel'] sgouezel
assignee:sgouezel
12-44703
12 days ago
31-23374
1 month ago
31-23413
31 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-ring-theory 554/2 Mathlib.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/RingTheory/Congruence/Defs.lean,Mathlib/RingTheory/Congruence/Hom.lean 5 4 ['AntoineChambert-Loir', 'eric-wieser', 'github-actions'] joneugster
assignee:joneugster
12-44649
12 days ago
43-37035
1 month ago
86-79654
86 days
28613 espottesmith
author:espottesmith
feat(Combinatorics): define undirected hypergraphs This PR defines undirected hypergraphs: ``` @[ext] structure Hypergraph (α : Type*) where /-- The vertex set -/ vertexSet : Set α /-- The hyperedge set -/ hyperedgeSet : Set (Set α) /-- All hyperedges must be subsets of the vertex set -/ hyperedge_isSubset_vertexSet : ∀ ⦃e⦄, e ∈ hyperedgeSet → e ⊆ vertexSet ``` In addition to the main definition, some additional definitions and related lemmas are provided: - vertex adjacency - hyperedge adjacency - vertex "stars" - special cases (loops, empty hypergraphs, trivial hypergraphs, complete hypergraphs, simple hypergraphs, k-uniform hypergraphs, and d-regular hypergraphs) - (some) hypergraph cardinality - subhypergraphs, induced subhypergraphs, and partial hypergraphs This implementation is certainly bare-bones. I'm submitting this PR at this point, rather than when my developments are more fleshed out, because there has been some interest in others contributing to hypergraph formalization in mathlib. In the near future, goals include: - defining incidence matrices (i.e., conversion from `Hypergraph α` to `Matrix α (Set α) β` - coersion/generalization of graph as 2-uniform hypergraph - conversion of a hypergraph into its associated clique graph/two-section graph - constructing the dual of a hypergraph (note: on first blush, this appears somewhat challenging, given that we define hyperedges as `Set α` rather than some other type `β`) - rank and co-rank - walks, paths, cycles, etc. on hypergraphs --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-combinatorics 375/0 Mathlib.lean,Mathlib/Combinatorics/Hypergraph/Basic.lean 2 52 ['b-mehta', 'espottesmith', 'github-actions', 'jt496', 'lauramonk', 'mathlib4-merge-conflict-bot'] b-mehta
assignee:b-mehta
12-34045
12 days ago
12-34045
12 days ago
18-20232
18 days
29028 themathqueen
author:themathqueen
feat(Algebra/Star): define `unitary R →* StarAlgEquiv S R R` Every unitary defines a star-algebra automorphism (this is an extension of a special version of `MulSemiringAction.toRingEquiv` for unitaries). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
64/0 Mathlib.lean,Mathlib/Algebra/Star/UnitaryStarAlgAut.lean 2 14 ['eric-wieser', 'github-actions', 'themathqueen'] eric-wieser
assignee:eric-wieser
12-12641
12 days ago
19-36530
19 days ago
21-7139
21 days
19046 j-loreaux
author:j-loreaux
feat: define class `SemigroupAction` --- If I can get this building with minimal performance impact, I would like to change the names to: `MulAction → MonoidAction` `SemigroupAction → MulAction` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
48/26 Mathlib/Algebra/Azumaya/Matrix.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/Hom.lean,Mathlib/Algebra/Group/Action/Prod.lean,Mathlib/Algebra/Group/Action/TypeTags.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/GroupTheory/CoprodI.lean,Mathlib/LinearAlgebra/Eigenspace/Matrix.lean,Mathlib/LinearAlgebra/FreeModule/Finite/Quotient.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/NumberTheory/ModularForms/CongruenceSubgroups.lean,Mathlib/RingTheory/Trace/Basic.lean 13 10 ['alreadydone', 'github-actions', 'j-loreaux', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'urkud'] jcommelin
assignee:jcommelin
11-68001
11 days ago
19-84231
19 days ago
26-25122
26 days
28311 eric-wieser
author:eric-wieser
fix(Tactic/NormNum): do not hang on large powers This uses `Lean.checkExponent` to guard against large powers. Unfortunately the log messages it emits are currently swallowed, but surfacing these may require changing the API for norm_num extensions (to live in `OptionT MetaM`) and so is left to future work. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta bug 41/23 Mathlib/Tactic/NormNum/Pow.lean,Mathlib/Tactic/Ring/Basic.lean,MathlibTest/norm_num.lean,MathlibTest/norm_num_ext.lean 4 4 ['github-actions', 'mathlib4-merge-conflict-bot'] robertylewis
assignee:robertylewis
11-67999
11 days ago
20-74655
20 days ago
28-41474
28 days
29040 PMKielstra
author:PMKielstra
feat: trapezoidal rule for integration This PR defines the trapezoidal rule and proves the standard error bound on it in terms of bounds on the second derivative. I have vague plans of using this plus interval arithmetic to develop a tactic that can automatically close goals of the form `\integral x in a..b, f x < y` or similar. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 273/0 Mathlib.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/TrapezoidalRule.lean 3 40 ['PMKielstra', 'github-actions', 'tb65536'] kex-y
assignee:kex-y
11-67995
11 days ago
20-74888
20 days ago
20-75330
20 days
29042 vihdzp
author:vihdzp
feat(SetTheory/Ordinal/Exponential): generalize theorems from `y = succ x` to `x < y` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-set-theory 18/6 Mathlib/SetTheory/Ordinal/Exponential.lean 1 1 ['github-actions'] b-mehta
assignee:b-mehta
11-67994
11 days ago
20-64636
20 days ago
20-64625
20 days
29058 vihdzp
author:vihdzp
feat: `Colex` type synonym We create a new `Colex` type synonym for the colexicographic order on a type. We use this to re-define the colexicographic order on `Finset`, protecting and deprecating the existing `Finset.Colex` type synonym. A future PR will add instances for `Pi` types and `Finsupp`. See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Pi.2ELex/near/536563593) for some discussion on this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order 152/59 Mathlib/Combinatorics/Colex.lean,Mathlib/Order/Synonym.lean 2 1 ['github-actions'] bryangingechen
assignee:bryangingechen
11-67993
11 days ago
20-29998
20 days ago
20-29994
20 days
29082 grunweg
author:grunweg
RFC: tag `IsInducing` and `Is{Open,Closed,}Embedding` with `fun_prop` I have not tested if this is usable in practice; perhaps it is not. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 37/5 Mathlib/Topology/Constructions.lean,Mathlib/Topology/Defs/Induced.lean,Mathlib/Topology/Maps/Basic.lean 3 1 ['github-actions'] jcommelin
assignee:jcommelin
11-67992
11 days ago
20-244
20 days ago
20-280
20 days
27882 euprunin
author:euprunin
chore: golf using `grind [Nat.cast_*]` 6/18 Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/EulerSineProd.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/RingTheory/ZMod/UnitsCyclic.lean 4 10 ['github-actions', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot'] urkud
assignee:urkud
11-41333
11 days ago
11-41333
11 days ago
45-83856
45 days
27370 euprunin
author:euprunin
chore(Tactic/CancelDenoms): golf `cancel_factors_eq` ---
Show trace profiling of cancel_factors_eq: 120 ms before, 46 ms after 🎉 ### Trace profiling of `cancel_factors_eq` before PR 27370 ```diff diff --git a/Mathlib/Tactic/CancelDenoms/Core.lean b/Mathlib/Tactic/CancelDenoms/Core.lean index c4b62d3e29..3ec2128994 100644 --- a/Mathlib/Tactic/CancelDenoms/Core.lean +++ b/Mathlib/Tactic/CancelDenoms/Core.lean @@ -80,6 +80,7 @@ theorem cancel_factors_le {α} [Field α] [LinearOrder α] [IsStrictOrderedRing · exact mul_pos had hbd · exact one_div_pos.2 hgcd +set_option trace.profiler true in theorem cancel_factors_eq {α} [Field α] {a b ad bd a' b' gcd : α} (ha : ad * a = a') (hb : bd * b = b') (had : ad ≠ 0) (hbd : bd ≠ 0) (hgcd : gcd ≠ 0) : (a = b) = (1 / gcd * (bd * a') = 1 / gcd * (ad * b')) := by ``` ``` ℹ [436/436] Built Mathlib.Tactic.CancelDenoms.Core (2.8s) info: Mathlib/Tactic/CancelDenoms/Core.lean:84:0: [Elab.command] [0.015258] theorem cancel_factors_eq {α} [Field α] {a b ad bd a' b' gcd : α} (ha : ad * a = a') (hb : bd * b = b') (had : ad ≠ 0) (hbd : bd ≠ 0) (hgcd : gcd ≠ 0) : (a = b) = (1 / gcd * (bd * a') = 1 / gcd * (ad * b')) := by rw [← ha, ← hb, ← mul_assoc bd, ← mul_assoc ad, mul_comm bd] ext; constructor · rintro rfl rfl · intro h simp only [← mul_assoc] at h refine mul_left_cancel₀ (mul_ne_zero ?_ ?_) h on_goal 1 => apply mul_ne_zero on_goal 1 => apply div_ne_zero · exact one_ne_zero all_goals assumption [Elab.definition.header] [0.014988] CancelDenoms.cancel_factors_eq info: Mathlib/Tactic/CancelDenoms/Core.lean:84:0: [Elab.async] [0.122474] elaborating proof of CancelDenoms.cancel_factors_eq [Elab.definition.value] [0.119890] CancelDenoms.cancel_factors_eq [Elab.step] [0.118614] rw [← ha, ← hb, ← mul_assoc bd, ← mul_assoc ad, mul_comm bd] ext; constructor · rintro rfl rfl · intro h simp only [← mul_assoc] at h refine mul_left_cancel₀ (mul_ne_zero ?_ ?_) h on_goal 1 => apply mul_ne_zero on_goal 1 => apply div_ne_zero · exact one_ne_zero all_goals assumption [Elab.step] [0.118601] rw [← ha, ← hb, ← mul_assoc bd, ← mul_assoc ad, mul_comm bd] ext; constructor · rintro rfl rfl · intro h simp only [← mul_assoc] at h refine mul_left_cancel₀ (mul_ne_zero ?_ ?_) h on_goal 1 => apply mul_ne_zero on_goal 1 => apply div_ne_zero · exact one_ne_zero all_goals assumption [Elab.step] [0.010324] rw [← ha, ← hb, ← mul_assoc bd, ← mul_assoc ad, mul_comm bd] [Elab.step] [0.010312] (rewrite [← ha, ← hb, ← mul_assoc bd, ← mul_assoc ad, mul_comm bd]; with_annotate_state"]" (try (with_reducible rfl))) [Elab.step] [0.010299] rewrite [← ha, ← hb, ← mul_assoc bd, ← mul_assoc ad, mul_comm bd]; with_annotate_state"]" (try (with_reducible rfl)) [Elab.step] [0.010291] rewrite [← ha, ← hb, ← mul_assoc bd, ← mul_assoc ad, mul_comm bd]; with_annotate_state"]" (try (with_reducible rfl)) [Elab.step] [0.105805] · intro h simp only [← mul_assoc] at h refine mul_left_cancel₀ (mul_ne_zero ?_ ?_) h on_goal 1 => apply mul_ne_zero on_goal 1 => apply div_ne_zero · exact one_ne_zero all_goals assumption [Elab.step] [0.105661] intro h simp only [← mul_assoc] at h refine mul_left_cancel₀ (mul_ne_zero ?_ ?_) h on_goal 1 => apply mul_ne_zero on_goal 1 => apply div_ne_zero · exact one_ne_zero all_goals assumption [Elab.step] [0.105650] intro h simp only [← mul_assoc] at h refine mul_left_cancel₀ (mul_ne_zero ?_ ?_) h on_goal 1 => apply mul_ne_zero on_goal 1 => apply div_ne_zero · exact one_ne_zero all_goals assumption [Elab.step] [0.043946] refine mul_left_cancel₀ (mul_ne_zero ?_ ?_) h [Elab.step] [0.043859] expected type: a = b, term mul_left_cancel₀ (mul_ne_zero ?_ ?_) h [Elab.step] [0.025447] expected type: ?m.103 * ?m.104 ≠ 0, term (mul_ne_zero ?_ ?_) [Elab.step] [0.025432] expected type: ?m.103 * ?m.104 ≠ 0, term mul_ne_zero ?_ ?_ [Meta.synthInstance] [0.019262] ✅️ NoZeroDivisors α [Elab.step] [0.021441] on_goal 1 => apply mul_ne_zero [Elab.step] [0.019543] apply mul_ne_zero [Elab.step] [0.019530] apply mul_ne_zero [Elab.step] [0.019514] apply mul_ne_zero [Meta.synthInstance] [0.013986] ✅️ NoZeroDivisors α [Elab.step] [0.018650] · exact one_ne_zero [Elab.step] [0.018355] exact one_ne_zero [Elab.step] [0.018309] exact one_ne_zero [Elab.step] [0.018269] exact one_ne_zero [Elab.step] [0.017827] expected type: 1 ≠ 0, term one_ne_zero [Meta.synthInstance] [0.012295] ✅️ NeZero 1 Build completed successfully (436 jobs). ``` ### Trace profiling of `cancel_factors_eq` after PR 27370 ```diff diff --git a/Mathlib/Tactic/CancelDenoms/Core.lean b/Mathlib/Tactic/CancelDenoms/Core.lean index c4b62d3e29..066f915189 100644 --- a/Mathlib/Tactic/CancelDenoms/Core.lean +++ b/Mathlib/Tactic/CancelDenoms/Core.lean @@ -80,20 +80,11 @@ theorem cancel_factors_le {α} [Field α] [LinearOrder α] [IsStrictOrderedRing · exact mul_pos had hbd · exact one_div_pos.2 hgcd +set_option trace.profiler true in theorem cancel_factors_eq {α} [Field α] {a b ad bd a' b' gcd : α} (ha : ad * a = a') (hb : bd * b = b') (had : ad ≠ 0) (hbd : bd ≠ 0) (hgcd : gcd ≠ 0) : (a = b) = (1 / gcd * (bd * a') = 1 / gcd * (ad * b')) := by - rw [← ha, ← hb, ← mul_assoc bd, ← mul_assoc ad, mul_comm bd] - ext; constructor - · rintro rfl - rfl - · intro h - simp only [← mul_assoc] at h - refine mul_left_cancel₀ (mul_ne_zero ?_ ?_) h - on_goal 1 => apply mul_ne_zero - on_goal 1 => apply div_ne_zero - · exact one_ne_zero - all_goals assumption + grind theorem cancel_factors_ne {α} [Field α] {a b ad bd a' b' gcd : α} (ha : ad * a = a') (hb : bd * b = b') (had : ad ≠ 0) (hbd : bd ≠ 0) (hgcd : gcd ≠ 0) : ``` ``` ℹ [436/436] Built Mathlib.Tactic.CancelDenoms.Core (3.1s) info: Mathlib/Tactic/CancelDenoms/Core.lean:84:0: [Elab.command] [0.034809] theorem cancel_factors_eq {α} [Field α] {a b ad bd a' b' gcd : α} (ha : ad * a = a') (hb : bd * b = b') (had : ad ≠ 0) (hbd : bd ≠ 0) (hgcd : gcd ≠ 0) : (a = b) = (1 / gcd * (bd * a') = 1 / gcd * (ad * b')) := by grind [Elab.definition.header] [0.014091] CancelDenoms.cancel_factors_eq info: Mathlib/Tactic/CancelDenoms/Core.lean:84:0: [Elab.async] [0.046425] elaborating proof of CancelDenoms.cancel_factors_eq [Elab.definition.value] [0.045869] CancelDenoms.cancel_factors_eq [Elab.step] [0.045340] grind [Elab.step] [0.045327] grind [Elab.step] [0.045311] grind info: Mathlib/Tactic/CancelDenoms/Core.lean:87:2: [Elab.async] [0.027621] Lean.addDecl [Kernel] [0.027585] ✅️ typechecking declarations [CancelDenoms.cancel_factors_eq._proof_1_1] Build completed successfully (436 jobs). ```
t-meta 1/11 Mathlib/Tactic/CancelDenoms/Core.lean 1 7 ['euprunin', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] alexjbest
assignee:alexjbest
11-39818
11 days ago
11-39818
11 days ago
56-74508
56 days
29365 staroperator
author:staroperator
feat(SetTheory/ZFC): add `ZFSet.card` The same as `ZFSet.rank`, we define `ZFSet.card` as `ZFSet.{u} → Cardinal.{u}` and prove some basic properties. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-set-theory 123/4 Mathlib.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Cardinal.lean 4 2 ['github-actions', 'staroperator', 'vihdzp'] nobody
11-21271
11 days ago
12-28277
12 days ago
12-28317
12 days
28140 YaelDillies
author:YaelDillies
feat: a `PointedCone`-valued version of `Submodule.span` This is merely to guide typing. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-convex-geometry toric 11/2 Mathlib/Geometry/Convex/Cone/Dual.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean 2 2 ['github-actions', 'mathlib4-merge-conflict-bot'] nobody
11-14126
11 days ago
11-14157
11 days ago
39-9049
39 days
28970 Whysoserioushah
author:Whysoserioushah
feat(Algebra/Algebra/ReducedNorm) : Defines reduced norm and trace TODO : 1. add the theorem proving reduced charpoly is independent from the choice of AlgEquiv (blocked by this [discussion](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Algebra.2ETensorProduct.2Eassoc/with/536349758)) 2. prove reduced charpoly is "actually" in the polynomial ring of base field (blocked by this [discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.E2.9C.94.20Refactor.20Subfield)) therefore content about this topic is basically the best I could do for now :-( --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
66/0 Mathlib.lean,Mathlib/Algebra/Algebra/ReducedNorm.lean 2 15 ['Whysoserioushah', 'chrisflav', 'eric-wieser', 'github-actions', 'kbuzzard'] chrisflav
assignee:chrisflav
11-12942
11 days ago
11-14290
11 days ago
22-15669
22 days
26923 oliver-butterley
author:oliver-butterley
feat(Dynamics/BirkhoffSum): add the pointwise ergodic theorem (Birkhoff's) The Pointwise Ergodic Theorem, also known as Birkhoff's Ergodic Theorem. Co-authored-by: Lua Viana Reis - [x] depends on: #26074 - [x] depends on: #26807 - [x] depends on: #26810 - [x] depends on: #26840 - [x] depends on: #26842 - [x] depends on: #26848 - [x] depends on: #26851 - [x] depends on: #26852 - [x] depends on: #26853 - [x] depends on: #27008 - [x] depends on: #28901 Zulip: [PR thread](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2326923.20The.20pointwise.20ergodic.20theorem.20.28Birkhoff's.29/with/527835158) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-dynamics 401/0 Mathlib.lean,Mathlib/Dynamics/BirkhoffSum/Pointwise.lean 2 7 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] urkud
assignee:urkud
10-67987
10 days ago
22-54341
22 days ago
29-23814
29 days
28339 JovanGerb
author:JovanGerb
feat(gcongr): support `@[gcongr]` for `Monotone` and friends This PR adds the feature to `gcongr` that you can now tag lemmas whose conclusion is `Monotone f`, `Antitone f`, etc. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 119/88 Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Algebra/Order/Module/Algebra.lean,Mathlib/Algebra/Order/Ring/Cast.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Log/ERealExp.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Multiset/Defs.lean,Mathlib/Data/Nat/Cast/Order/Basic.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/LinearAlgebra/Basis/Flag.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/Order/Filter/Map.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Tactic/GCongr/Core.lean,MathlibTest/GCongr/inequalities.lean 20 4 ['github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot'] adamtopaz
assignee:adamtopaz
10-67986
10 days ago
22-16216
22 days ago
34-72836
34 days
28876 ScottCarnahan
author:ScottCarnahan
feat (Algebra/Group/Action/Basic): add IsLeftCancelSMul This PR adds classes `IsLeftCancelSMul` and `IsLeftCancelVAdd`, for actions that are injective on the left. This property automatically holds for group actions, and for the left multiplication action of a left cancellative monoid. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 41/15 Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Data/Finset/SMulAntidiagonal.lean,Mathlib/Data/Set/SMulAntidiagonal.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean 5 1 ['github-actions'] dagurtomas
assignee:dagurtomas
10-67984
10 days ago
18-37251
18 days ago
23-82713
23 days
28833 yury-harmonic
author:yury-harmonic
feat(MvPolynomial/Expand): more lemmas --- - [x] depends on: #28832 - [x] depends on: #28830 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 88/18 Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/MvPolynomial/Expand.lean 2 2 ['github-actions', 'mathlib4-dependent-issues-bot'] dwrensha
assignee:dwrensha
10-67984
10 days ago
23-84725
23 days ago
24-77
24 days
29121 Ruben-VandeVelde
author:Ruben-VandeVelde
feat: MvPolynomial.symmetricSubalgebra.{aevalMultiset,sumPolynomial} --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory 192/0 Mathlib.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/Eval.lean 2 1 ['github-actions'] chrisflav
assignee:chrisflav
10-67981
10 days ago
18-67653
18 days ago
18-67691
18 days
29369 vlad902
author:vlad902
feat(SimpleGraph): `IsSubwalk` of common Walk decompositions Add some helper lemmas to show that decompositions of walks are sub-walks. t-combinatorics 61/17 Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkDecomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean 2 1 ['github-actions'] nobody
10-49370
10 days ago
12-7065
12 days ago
12-7113
12 days
29376 vlad902
author:vlad902
feat(SimpleGraph): Helper lemmas for `Walk.IsSubwalk` t-combinatorics 29/0 Mathlib/Combinatorics/SimpleGraph/Walk.lean 1 1 ['github-actions'] nobody
10-49199
10 days ago
11-45687
11 days ago
11-45726
11 days
29306 YaelDillies
author:YaelDillies
chore(GroupTheory/GroupAction/Basic): don't import `Module` This is useful to be able to replace `NoZeroSMulDivisors` with `Module.IsTorsionFree` later. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
16/17 Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/LinearAlgebra/Projectivization/Cardinality.lean 2 7 ['YaelDillies', 'eric-wieser', 'github-actions'] eric-wieser
assignee:eric-wieser
10-45095
10 days ago
10-45173
10 days ago
14-6521
14 days
28511 YaelDillies
author:YaelDillies
feat(Finsupp): `congr!`-compatible version of `prod_congr` `congr!` doesn't like the `g1 x (f x)` appearing in the hypothesis of `Finsupp.prod_congr`: `f x` isn't a free variable. Note: A few proofs broke due to `simp` using `congr` lemmas internally. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
17/11 Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean 5 12 ['JovanGerb', 'YaelDillies', 'eric-wieser', 'github-actions', 'kmill'] kmill
assignee:kmill
10-32679
10 days ago
32-39134
1 month ago
32-39172
32 days
29362 stepanholub
author:stepanholub
Periods of lists and the Periodicity Lemma Period of a word (List) is defined and a proof of the Periodicity Lemma (aka Fine-Wilf Theorem) is provided. Fine-Wilf is the basic fact about a word having two periods. --- t-data new-contributor 223/0 Mathlib.lean,Mathlib/Data/List/PeriodicityLemma.lean 2 99 ['Timeroot', 'github-actions', 'madvorak', 'plp127', 'stepanholub'] nobody
10-17328
10 days ago
12-37499
12 days ago
12-37541
12 days
27073 pechersky
author:pechersky
feat(Archive/Examples/Local): files showcasing properties of local fields for p-adics, completions of number fields, laurent series, and fraction rings of witt vectors Should get filled in as more data/instances are declared --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-number-theory 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 2 ['github-actions', 'mathlib4-merge-conflict-bot'] alexjbest
assignee:alexjbest
10-7552
10 days ago
10-7579
10 days ago
61-24347
61 days
29410 jsm28
author:jsm28
feat(Data/Nat/Init): `n.AtLeastTwo` implies `NeZero (n - 1)` Add an instance for `NeZero (n - 1)` deduced from `n.AtLeastTwo`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 2/0 Mathlib/Data/Nat/Init.lean 1 1 ['github-actions'] nobody
9-82443
9 days ago
9-82507
9 days ago
9-82488
9 days
28835 euprunin
author:euprunin
chore(Data/List): golf 13 lines from `bidirectionalRec_cons_append` using `grind` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 1/14 Mathlib/Data/List/Induction.lean 1 4 ['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] nobody
9-73191
9 days ago
9-73191
9 days ago
24-52668
24 days
28219 joelriou
author:joelriou
feat(CategoryTheory): monomorphisms in Type are stable under transfinite compositions --- - [x] depends on: #26030 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 71/0 Mathlib.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/CategoryTheory/Types/Monomorphisms.lean 3 5 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] TwoFX
assignee:TwoFX
9-67990
9 days ago
18-78442
18 days ago
19-8886
19 days
29185 eric-wieser
author:eric-wieser
feat: add missing `norm_cast` on subobject coercion lemmas to set This is not exhaustive, but performed manually with some regex searches. Only one proof breaks, and only because `convert` goes further than it previously did. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
56/52 Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Subalgebra/Prod.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Subgroup/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Algebra/GroupWithZero/Subgroup.lean,Mathlib/Algebra/GroupWithZero/Submonoid/Pointwise.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subring/Pointwise.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Defs.lean,Mathlib/Algebra/Ring/Subsemiring/Pointwise.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Algebra/Star/NonUnitalSubsemiring.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/Algebra/Star/Subsemiring.lean,Mathlib/Topology/Algebra/Group/ClosedSubgroup.lean 28 1 ['github-actions'] dagurtomas
assignee:dagurtomas
9-67983
9 days ago
17-4290
17 days ago
17-4272
17 days
27742 ChrisHughes24
author:ChrisHughes24
feat(Nat/nth): inequalities about Nat.nth --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 51/0 Mathlib/Data/Nat/Nth.lean 1 3 ['ChrisHughes24', 'github-actions'] nobody
9-44737
9 days ago
48-32003
1 month ago
48-32046
48 days
27390 alreadydone
author:alreadydone
feat(FieldTheory/Galois): normal basis theorem Co-authored-by: Madison Crim @maddycrim Co-authored-by: Aaron Liu @plp127 Co-authored-by: Justus Springer @justus-springer from [*Formalizing Class Field Theory*](https://www.claymath.org/events/formalizing-class-field-theory/) --- - [x] depends on: #27355 - [x] depends on: #27368 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
156/1 Mathlib.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Polynomial/Module/AEval.lean,Mathlib/FieldTheory/Galois/NormalBasis.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean,docs/references.bib 7 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] dagurtomas
assignee:dagurtomas
9-25181
9 days ago
9-25245
9 days ago
34-71611
34 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/) t-data new-contributor 31/0 Mathlib.lean,Mathlib/Data/PNat/Order.lean 2 14 ['Ruben-VandeVelde', 'eric-wieser', 'github-actions', 'jburroni', 'vihdzp'] ericrbg
assignee:ericrbg
9-7461
9 days ago
9-12465
9 days ago
79-14779
79 days
28945 harahu
author:harahu
doc: hyphenate compound adjectives ending in -dimensional Compound adjectives appearing before the noun they are modifying should be hyphenated in order to avoid ambiguity. This PR hyphenates such compound adjectives than are ending in "-dimensional". It does not cover similar compound adjectives appearing _after_ their noun, as hyphenation is then regarded as a stylistic choice, as opposed to a grammatical tool. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge 180/180 Mathlib/Algebra/Azumaya/Matrix.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/FGModuleCat/Limits.lean,Mathlib/Algebra/Lie/Derivation/Killing.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/BumpFunction/SmoothApprox.lean,Mathlib/Analysis/Calculus/ContDiff/FiniteDimension.lean,Mathlib/Analysis/Calculus/Deriv/AffineMap.lean,Mathlib/Analysis/Calculus/Implicit.lean,Mathlib/Analysis/Calculus/LineDeriv/QuadraticMap.lean,Mathlib/Analysis/Complex/AbsMax.lean,Mathlib/Analysis/Complex/Tietze.lean,Mathlib/Analysis/Convex/AmpleSet.lean,Mathlib/Analysis/Convex/Continuous.lean,Mathlib/Analysis/Convex/Measure.lean,Mathlib/Analysis/Convex/SimplicialComplex/Basic.lean,Mathlib/Analysis/Distribution/AEEqOfIntegralContDiff.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/EuclideanDist.lean,Mathlib/Analysis/InnerProductSpace/JointEigenspace.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Operator/ContinuousLinearMap.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Extension.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/CategoryTheory/Preadditive/Schur.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/FieldTheory/Differential/Liouville.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/FieldTheory/IsAlgClosed/Spectrum.lean,Mathlib/FieldTheory/PrimitiveElement.lean,Mathlib/FieldTheory/PurelyInseparable/Basic.lean,Mathlib/Geometry/Manifold/BumpFunction.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/Metrizable.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/LinearAlgebra/Coevaluation.lean,Mathlib/LinearAlgebra/Complex/FiniteDimensional.lean,Mathlib/LinearAlgebra/Complex/Module.lean,Mathlib/LinearAlgebra/Dimension/Finite.lean,Mathlib/LinearAlgebra/Dimension/Finrank.lean,Mathlib/LinearAlgebra/Dimension/FreeAndStrongRankCondition.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/LinearAlgebra/FiniteDimensional/Defs.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/Matrix/FiniteDimensional.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Card.lean,Mathlib/LinearAlgebra/Multilinear/FiniteDimensional.lean,Mathlib/MeasureTheory/Integral/TorusIntegral.lean,Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean,Mathlib/MeasureTheory/Measure/Haar/OfBasis.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/Order/RelSeries.lean,Mathlib/Probability/Process/FiniteDimensionalLaws.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/Maschke.lean,Mathlib/RepresentationTheory/Tannaka.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Lattice.lean,Mathlib/RingTheory/Grassmannian.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Topology/Algebra/InfiniteSum/Defs.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/MetricSpace/HausdorffDimension.lean,MathlibTest/fun_prop.lean,docs/overview.yaml,docs/undergrad.yaml 76 6 ['github-actions', 'mathlib4-merge-conflict-bot', 'tb65536'] tb65536
assignee:tb65536
8-84961
8 days ago
8-84980
8 days ago
21-79164
21 days
29351 staroperator
author:staroperator
feat(SetTheory/Cardinal): generalize and rename theorems on `Cardinal.sum` Some theorems on `Cardinal.sum f` are taking `f : ι → Cardinal.{max u v}`, which can be generalized to `f : ι → Cardinal.{v}`. Also rename `sum_le_iSup_lift`, `sum_lt_lift_of_isRegular`, `sum_eq_iSup_lift` etc. to reflect their signatures in names. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-set-theory 79/36 Mathlib/Data/W/Cardinal.lean,Mathlib/ModelTheory/Encoding.lean,Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Cardinal/Defs.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/SetTheory/Cardinal/Ordinal.lean,Mathlib/SetTheory/Cardinal/Pigeonhole.lean,Mathlib/SetTheory/Cardinal/Regular.lean 10 5 ['github-actions', 'staroperator', 'vihdzp'] nobody
8-74148
8 days ago
12-74047
12 days ago
13-6839
13 days
29224 euprunin
author:euprunin
chore: remove redundant `rcases` invocations --- **Note:** Although technically redundant, some of these may be worth keeping for readability, or other reasons. Let me know if you think any should stay. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
1/10 Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/Support.lean 7 4 ['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] chrisflav
assignee:chrisflav
8-67989
8 days ago
15-74478
15 days ago
16-129
16 days
29449 mitchell-horner
author:mitchell-horner
feat(Combinatorics/SimpleGraph): add Turán density related theorems Refactors `tendsto_turanDensity` and implements `turanDensity_eq_sInf` and `isContained_of_card_edgeFinset` (theorems that are common in proofs involving Turán density). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 52/14 Mathlib/Combinatorics/SimpleGraph/Extremal/TuranDensity.lean 1 1 ['github-actions'] nobody
8-62344
8 days ago
8-77739
8 days ago
8-77783
8 days
27162 themathqueen
author:themathqueen
feat(Analysis/InnerProductSpace/Positive): `U.starProjection ≤ V.starProjection` iff `U ≤ V` For symmetric projections `p` and `q`, `p ≤ q` iff `q ∘ p = p`, so then: `U.starProjection ≤ V.starProjection` iff `U ≤ V`, which implies that `Submodule.starProjection` is an injective function. --- - [x] depends on: #25910 - [x] depends on: #27619 - [x] depends on: #27642 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 58/0 Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean 2 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] j-loreaux
assignee:j-loreaux
8-32413
8 days ago
28-75940
28 days ago
33-56366
33 days
28950 Vierkantor
author:Vierkantor
fix(TacticAnalysis): comment out syntax range check In #28802 we discovered the tactic analysis framework does not fire on declarations using `where` clauses. The reason is that `def foo where ...` gets turned into `def foo := { ... }`, and the `{ ... }` syntax is assigned a range outside of the `where ...` syntax; this causes the syntax range check to omit the whole declaration body. I am not entirely sure this is a bug in Lean or it was a misuse of ranges; in the meantime it should be okay to skip the check: the worst that happens is we analyze a piece of syntax outside of the declaration, which we'd get to later anyway. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 23/3 Mathlib/Tactic/TacticAnalysis.lean,MathlibTest/TacticAnalysis.lean 2 3 ['Vierkantor', 'github-actions', 'thorimur'] robertylewis
assignee:robertylewis
8-17309
8 days ago
22-36045
22 days ago
22-36026
22 days
27567 themathqueen
author:themathqueen
feat(LinearAlgebra/TensorProduct/Associator): add `lid` and `assoc` tensor lemmas This adds `TensorProduct.lid_tensor` and `TensorProduct.assoc_tensor`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra easy
label:t-algebra$
31/2 Mathlib/LinearAlgebra/TensorProduct/Associator.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean 2 3 ['github-actions', 'themathqueen'] mattrobball
assignee:mattrobball
8-13645
8 days ago
38-3168
1 month ago
51-82401
51 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$
69/3 Mathlib/LinearAlgebra/Projectivization/Subspace.lean 1 5 ['eric-wieser', 'gasparattila', 'github-actions'] Vierkantor
assignee:Vierkantor
8-6563
8 days ago
70-85593
2 months ago
70-85638
70 days
25736 robin-carlier
author:robin-carlier
feat(AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms): Normal forms for `P_σ`s We prove that admissible lists introduced in #21744 indeed provide a suitable normal form for morphisms of `SimplexCategoryGenRel` satisfying `P_σ` (i.e that are compositions of degeneracies). 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, thanks to the fifth simplicial identity, composition on the right by some `σ i` corresponds to simplicial insertion of `i` in the list. This gives existence of a normal form for every morphism satisfying `P_σ`, i.e exhibits such morphism as some `standardσ`. 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. Since admissible lists are sorted, this fully characterizes the list, and thus shows that the list only depends on the morphism `standardσ` attached to it. 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* t-algebraic-topology large-import 189/7 Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean 1 12 ['github-actions', 'jcommelin', 'joelriou', 'mathlib4-dependent-issues-bot', 'robin-carlier'] mattrobball
assignee:mattrobball
7-82387
7 days ago
7-82442
7 days ago
90-29406
90 days
28719 mitchell-horner
author:mitchell-horner
refactor: redefine `IsTuranMaximal` Redefined `IsTuranMaximal := G.IsExtremal (CliqueFree · (r + 1))` and - replaced `classical` in `IsTuranMaximal.le_iff_eq` with `DecidableRel` - refactored `turanGraph.instDecidableRelAdj`, `turanGraph_zero`, `exists_isTuranMaximal` - added `open Fintype` - replaced `simp only` with `rw` or `simp_rw` --- - [x] depends on: #28721 - [x] depends on: #29054 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 33/46 Mathlib/Combinatorics/SimpleGraph/Extremal/Turan.lean 1 7 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mitchell-horner', 'vihdzp'] kmill
assignee:kmill
7-67981
7 days ago
16-20892
16 days ago
20-63986
20 days
29257 harahu
author:harahu
doc: attach "pre", "pseudo", "semi" and "sub" as a prefixes where they are now free-standing These are all merely prefixes and should be attached, either in closed form or by hyphen, to some other construct. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 50/50 Mathlib/Algebra/Star/NonUnitalSubsemiring.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/Analysis/Normed/Group/BallSphere.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Lean/Meta/KAbstractPositions.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Initialize.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/Probability/Martingale/BorelCantelli.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/Gluing.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/MetricSpace/ProperSpace.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean,Mathlib/Topology/MetricSpace/ThickenedIndicator.lean,Mathlib/Topology/MetricSpace/Thickening.lean,Mathlib/Topology/Metrizable/Basic.lean,Mathlib/Topology/Metrizable/Uniformity.lean,scripts/autolabel.lean 21 1 ['euprunin', 'github-actions'] JovanGerb
assignee:JovanGerb
7-67970
7 days ago
15-3946
15 days ago
15-3989
15 days
29488 Timeroot
author:Timeroot
feat: 'said' tactic Functionally similar to `says`, but explicitly not for checking output or even saying there ever was output. `X said Y` just means that `X` was part of the process for (a human, or machine, or both) to generate `Y`. Based on this [#mathlib4 > noisy simp says in CI @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/noisy.20simp.20says.20in.20CI/near/538443152) Zulip discussion --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 40/0 Mathlib/Tactic/Linter/UnusedTactic.lean,Mathlib/Tactic/Linter/UnusedTacticExtension.lean,Mathlib/Tactic/Says.lean,MathlibTest/says.lean 4 1 ['github-actions'] nobody
7-59455
7 days ago
7-59531
7 days ago
7-59512
7 days
26331 Timeroot
author:Timeroot
feat(Algebra/Polynomial): Descartes' Rule of signs This PR continues the work from #23681. Original PR: https://github.com/leanprover-community/mathlib4/pull/23681 t-algebra
label:t-algebra$
467/3 Mathlib.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean,Mathlib/Data/Sign/Defs.lean 6 27 ['Ruben-VandeVelde', 'Timeroot', 'adomani', 'chrisflav', 'github-actions'] adomani
assignee:adomani
7-58721
7 days ago
85-60704
2 months ago
85-60745
85 days
27702 FLDutchmann
author:FLDutchmann
feat(NumberTheory/SelbergSieve): define Lambda-squared sieves and prove important properties This PR continues the work from #22052. Original PR: https://github.com/leanprover-community/mathlib4/pull/22052 - [ ] depends on: #27820 t-number-theory 199/0 Mathlib/NumberTheory/SelbergSieve.lean 1 6 ['FLDutchmann', 'bryangingechen', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] nobody
7-36039
7 days ago
7-36698
7 days ago
7-37756
7 days
28780 gaetanserre
author:gaetanserre
feat(Analysis/SpecialFunctions): add the sigmoid function Add the Sigmoid from `ℝ` to `ℝ` and show some analytical properties. Then, add `sigmoid_ord_embedding`, the Sigmoid function seen as an `OrderEmbedding` from `ℝ` to `I`. Show that it is a `MeasurableEmbedding` and that we could use it to construct a `MeasurableEmbedding` from any `StandardBorelSpace` to `I`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 292/0 Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Sigmoid.lean,Mathlib/Data/Set/Operations.lean 3 66 ['gaetanserre', 'github-actions', 'j-loreaux', 'themathqueen'] j-loreaux
assignee:j-loreaux
7-28739
7 days ago
7-28739
7 days ago
22-51700
22 days
29115 CBirkbeck
author:CBirkbeck
feat: develop some more limUnder api We add results about how the `limUndet atTop` function behaves under addition, multiplication, etc. This is useful for defining the Eisensten series E2. See #28733 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 105/0 Mathlib.lean,Mathlib/Topology/UniformSpace/LimUnder.lean 2 10 ['CBirkbeck', 'github-actions', 'j-loreaux', 'loefflerd', 'mathlib4-merge-conflict-bot', 'plp127'] j-loreaux
assignee:j-loreaux
7-21760
7 days ago
16-35199
16 days ago*
19-7258
19 days*
29500 vihdzp
author:vihdzp
feat: `WellFoundedLT (LowerSet α)` We prove that `LowerSet α` is well-founded when `α` is a WQO. --- This result is used in the CGT repository to construct the poset game! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order 31/0 Mathlib.lean,Mathlib/Order/UpperLower/WellFounded.lean 2 2 ['github-actions', 'plp127'] nobody
7-14341
7 days ago
7-24306
7 days ago
7-24349
7 days
29504 zhuyizheng
author:zhuyizheng
feat(MeasureTheory): add absolutely continuous functions Add absolutely continuous functions. Part of originally planned #29092. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 375/0 Mathlib.lean,Mathlib/MeasureTheory/Function/AbsolutelyContinuous.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean 3 1 ['github-actions'] nobody
7-12523
7 days ago
7-12523
7 days ago
7-19363
7 days
25324 eric-wieser
author:eric-wieser
feat: more functorial results about DFinsupp We have these already for Finsupp. The `DFinsupp` statements need some extra casts in some places. --- - [ ] depends on: #27182 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) [#mathlib4 > Equiv.cast for structures @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Equiv.2Ecast.20for.20structures/near/521390935) t-data t-algebra
label:t-algebra$
137/16 Mathlib/Data/DFinsupp/Defs.lean,Mathlib/LinearAlgebra/DFinsupp.lean 2 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
7-4057
7 days ago
7-4212
7 days ago
7-4189
7 days
29057 jeremypparker
author:jeremypparker
feat(Topology/Instances): `AddCircle.liftIoc_continuous` Previously `AddCircle.liftIco_continuous` existed but this equivalent result did not. In the process I prove that `liftIoc` is equivalent to `liftIco` if the endpoint values are equal. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-topology 50/5 Mathlib/Topology/Instances/AddCircle/Defs.lean 1 8 ['Ruben-VandeVelde', 'github-actions', 'jeremypparker'] ADedecker
assignee:ADedecker
6-83833
6 days ago
20-30118
20 days ago
20-30154
20 days
29380 chrisflav
author:chrisflav
feat(CategoryTheory/MorphismProperty): define `ind P` Given a morphism property `P`, we define a morphism property `ind P` that is satisfied for `f : X ⟶ Y` if `Y` is a filtered colimit of `Yᵢ` and `fᵢ : X ⟶ Yᵢ` satisfy `P`. We show that `ind` is idempotent under certain compactness assumptions. --- - [x] depends on: #29382 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-category-theory 289/0 Mathlib.lean,Mathlib/CategoryTheory/Limits/Presentation.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean,Mathlib/CategoryTheory/MorphismProperty/Ind.lean,Mathlib/CategoryTheory/ObjectProperty/Ind.lean,Mathlib/CategoryTheory/Presentable/Finite.lean,Mathlib/CategoryTheory/WithTerminal/Lemmas.lean 7 13 ['chrisflav', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot'] nobody
6-83698
6 days ago
6-83698
6 days ago
8-33331
8 days
28395 joelriou
author:joelriou
feat(AlgebraicTopology/SimplicialSet): nondegenerate simplices in the standard simplex In this PR, we show that `d`-dimensional nondegenerate simplices in `Δ[n]` identify to `Fin (d + 1) ↪o Fin (n + 1)`. (This PR also contains some general additional API for (non)degenerate simplices. For this reason, three definitions related to subcomplexes generated by a simplex had to be moved from `StdSimplex.lean` to `Subcomplex.lean`.) --- - [x] depends on: #28337 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebraic-topology 248/20 Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/AlgebraicTopology/SimplicialSet/Simplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/Subcomplex.lean,Mathlib/Order/Hom/Basic.lean 5 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] nobody
6-83314
6 days ago
7-6535
7 days ago
7-6516
7 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 7 ['Paul-Lez', 'eric-wieser', 'github-actions', 'kckennylau'] nobody
6-80185
6 days ago
155-84510
5 months ago
155-84555
155 days
29518 joelriou
author:joelriou
feat(CategoryTheory): extremal epimorphisms An extremal epimorphism `p : X ⟶ Y` is an epimorphism which does not factor through any proper subobject of `Y`. In case the category has equalizers, we show that a morphism `p : X ⟶ Y` which does not factor through any proper subobject of `Y` is automatically an epimorphism, and also an extremal epimorphism. We also show that a strong epimorphism is an extremal epimorphism, and that both notions coincide when the category has pullbacks. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 75/0 Mathlib.lean,Mathlib/CategoryTheory/ExtremalEpi.lean 2 3 ['github-actions', 'joelriou'] nobody
6-72932
6 days ago
6-74466
6 days ago
6-74449
6 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
6-72301
6 days ago
unknown
unknown
29221 euprunin
author:euprunin
chore: remove redundant `rintro` invocations (before `omega`) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 0/4 Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/Group/Nat/Range.lean,Mathlib/Data/List/Range.lean 3 4 ['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] RemyDegenne
assignee:RemyDegenne
6-67985
6 days ago
14-80522
14 days ago
16-1216
16 days
29300 Louddy
author:Louddy
feat: SkewPolynomial # Univariate skew polynomials Skew polynomials are represented as `SkewMonoidAlgebra R (Multiplicative ℕ)`, where `R` is usually at least a Semiring. In this file, we define `SkewPolynomial` and provide basic instances. The point if this PR is to introduce the very most basic definitions and API. From #23949. 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$
178/0 Mathlib.lean,Mathlib/Algebra/SkewPolynomial/Basic.lean,docs/references.bib 3 1 ['github-actions'] joelriou
assignee:joelriou
6-67977
6 days ago
14-33378
14 days ago
14-33408
14 days
29302 harahu
author:harahu
doc: hyphenate attributive compound adjectives starting with "upper" or "lower" Compound adjectives that are attributive (coming before their noun) should almost always be hyphenated in English. This PR covers such adjectives that are starting with "upper" or "lower". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 53/53 Mathlib/Analysis/LocallyConvex/Barrelled.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean,Mathlib/Order/ModularLattice.lean,Mathlib/Topology/Semicontinuous.lean 4 1 ['github-actions'] EtienneC30
assignee:EtienneC30
6-67976
6 days ago
14-35843
14 days ago
14-35824
14 days
29315 kbuzzard
author:kbuzzard
chore: raise priority of `IsTopologicalSemiring.toIsModuleTopology` Instances of the form `SMul A B -> SMul (F A) (F B)` can be problematic for several reasons, one of them being that if `A = B` is a ring and if `F A` is also ring then this can cause a diamond with `Algebra.id`. In mathlib we attempt to coerce typeclass inference away from such problems by raising the priority of `Algebra.id` to 1100; this hack (implemented in #13032) seems to work well, indeed it seems sensible to try this instance early because it should be quick to fail and is always the right idea when it doesn't (the change also made mathlib faster and made a proof better). By the same logic it seems safe to raise the priority of `IsTopologicalSemiring.toIsModuleTopology` by the same amount; in FLT there is a mathematically natural but mathlib-problematic instance `Algebra K L -> Algebra (𝔸 K) (𝔸 L)` and then another instance `Algebra K L -> IsModuleTopology (𝔸 K) (𝔸 L)` where `𝔸 K` is the adele ring of the number field `K`, and the change in this PR solves timeouts when `K = L`. Zulip: [#mathlib4 > product of modules over product of rings @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/product.20of.20modules.20over.20product.20of.20rings/near/532799613) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) There are other solutions to this problem -- I am certainly not claiming that the FLT project needs this PR to be merged! We can tinker with priorities locally in FLT for example. However when I noticed that `Algebra.id` had a raised priority in mathlib I realised that mathlib might be amenable to this further ~~hack~~change. t-topology 6/1 Mathlib/Topology/Algebra/Module/ModuleTopology.lean 1 4 ['github-actions', 'kbuzzard', 'leanprover-bot'] j-loreaux
assignee:j-loreaux
6-67976
6 days ago
14-23721
14 days ago
14-23762
14 days
29503 zhuyizheng
author:zhuyizheng
feat(MeasureTheory): add Lebesgue differentiation theorem for intervals Add the Lebesgue differentiation theorem for intervals. Part of originally planned #29092. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 77/0 Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/LebesgueDifferetiationThm.lean 3 19 ['github-actions', 'themathqueen', 'vlad902'] nobody
6-50919
6 days ago
7-12541
7 days ago
7-19825
7 days
29539 YaelDillies
author:YaelDillies
feat: monoid algebras are invariant under base change From Toric Co-authored-by: Michał Mrugała --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory toric large-import 112/6 Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/RingTheory/TensorProduct/MonoidAlgebra.lean 3 1 ['github-actions'] nobody
6-49039
6 days ago
6-49039
6 days ago
6-50446
6 days
29510 sgouezel
author:sgouezel
chore: add missing fast_instance attributes --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 11/10 Mathlib/Topology/ContinuousMap/Bounded/Normed.lean,Mathlib/Topology/ContinuousMap/ZeroAtInfty.lean 2 5 ['github-actions', 'grunweg', 'leanprover-bot', 'themathqueen'] nobody
6-49002
6 days ago
7-13401
7 days ago
7-13439
7 days
29326 FormulaRabbit81
author:FormulaRabbit81
feat(Analysis): constant * function tending to 0 is still 0 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-analysis 24/0 Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean,Mathlib/Topology/Instances/Real/Lemmas.lean 3 2 ['FormulaRabbit81', 'github-actions'] nobody
6-39478
6 days ago
6-39478
6 days ago
14-6236
14 days
29552 RemyDegenne
author:RemyDegenne
feat(Probability): lemmas about composition of kernels and measures From the LeanBandits project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-measure-probability 44/0 Mathlib/Probability/ConditionalProbability.lean,Mathlib/Probability/Kernel/Composition/Lemmas.lean,Mathlib/Probability/Kernel/Composition/MeasureComp.lean,Mathlib/Probability/Kernel/Composition/ParallelComp.lean,Mathlib/Probability/Kernel/Composition/Prod.lean 5 1 ['github-actions'] nobody
6-32290
6 days ago
6-32300
6 days ago
6-32338
6 days
29554 RemyDegenne
author:RemyDegenne
feat(Probability): `CondIndepFun` lemmas Lemmas about conditional independence of constant random variables and of random variables that are measurable with respect to the sigma-algebra that we are conditioning on. From the LeanBandits project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-measure-probability 94/2 Mathlib/Probability/Independence/Basic.lean,Mathlib/Probability/Independence/Conditional.lean,Mathlib/Probability/Independence/Kernel.lean 3 1 ['github-actions'] nobody
6-31319
6 days ago
6-31328
6 days ago
6-31365
6 days
29556 joelriou
author:joelriou
feat(CategoryTheory): canonical colimits Given a functor `F : C ⥤ D` and `Y : D`, we say that `Y` is a canonical colimit relatively to `F` is `Y` identifies to the colimit of all `F.obj X` for `X : C` and `f : F.obj X ⟶ Y`, i.e. `Y` identifies to the colimit of the obvious functor `CostructuredArrow F Y ⥤ D` (see definitions `canonicalCocone` and `CanonicalColimit`). We introduce the corresponding property `isCanonicalColimit F` of objects of `D`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 72/0 Mathlib.lean,Mathlib/CategoryTheory/Limits/Canonical.lean 2 1 ['github-actions'] nobody
6-28693
6 days ago
6-28763
6 days ago
6-28744
6 days
25735 robin-carlier
author:robin-carlier
feat(CategoryTheory/Limits/Sifted): characterization of sifted categories Characterize small sifted as those for which the `Type`-valued colimit functor preserves finite product. Deduce that filtered categories, and that categories admitting a final functor from a sifted categories are also sifted. --- Second part of what used to be #17554. The core of the proof relies on a few private lemmas/defs (`colimBoxIsoColimTensColim` and `factorization_prod_comparison_colim` being the most important ones) and I don’t know if that can be avoided. I am still unsure wether or not the part relating sifted categories to filtered categories should be split off in a different file to avoid importing `CategoryTheory/Limits/FilteredColimitCommutesFiniteLimit.lean` every time `CategoryTheory/Limits/Sifted.lean` is imported. The fact that filtered categories are sifted can also be proved without the characterization in this PR (it reduces essentially to `IsFiltered.bowtie`), and so it could also stay in this file with less imports, but I find it nicer to do it using the characterization. - [x] depends on: #17766 - [x] depends on: #17779 - [x] depends on: #25732 - [x] depends on: #25734 - [x] depends on: #25731 - [x] depends on: #24735 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *This PR continues the work from #17781.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/17781* large-import t-category-theory 166/3 Mathlib/CategoryTheory/Limits/Indization/FilteredColimits.lean,Mathlib/CategoryTheory/Limits/Sifted.lean 2 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] adamtopaz
assignee:adamtopaz
6-28559
6 days ago
31-35351
1 month ago
31-35359
31 days
29550 Raph-DG
author:Raph-DG
feat(RingTheory): Order of vanishing in a discrete valuation ring In this PR we develop some API for working with the order of vanishing in a discrete valuation ring. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory file-removed 462/1 Mathlib.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/OrderOfVanishing/Basic.lean,Mathlib/RingTheory/OrderOfVanishing/Properties.lean 4 1 ['github-actions'] nobody
6-21827
6 days ago
6-32874
6 days ago
6-32926
6 days
29562 ShreckYe
author:ShreckYe
feat(Analysis/SpecialFunctions/Trigonometric): tangent half-angle substitution t-analysis 82/0 Mathlib/Analysis/SpecialFunctions/Trigonometric/Complex.lean 1 1 ['github-actions'] nobody
6-12823
6 days ago
6-12835
6 days ago
6-12879
6 days
27847 euprunin
author:euprunin
chore(Algebra): avoid duplicating proofs by reusing existing theorems or lemmas t-algebra
label:t-algebra$
46/73 Archive/Imo/Imo1972Q5.lean,Archive/Imo/Imo2015Q6.lean,Mathlib/Algebra/Homology/Embedding/Extend.lean,Mathlib/Algebra/MvPolynomial/Rename.lean,Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/BigOperators/Expect.lean,Mathlib/Algebra/Order/BigOperators/Group/Finset.lean,Mathlib/Algebra/Order/BigOperators/Group/Multiset.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Degree.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/NumberTheory/Pell.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/Tactic/ComputeDegree.lean,Mathlib/Topology/Algebra/Order/Group.lean,Mathlib/Topology/MetricSpace/Algebra.lean,MathlibTest/GCongr/inequalities.lean,MathlibTest/GRewrite.lean 25 18 ['Ruben-VandeVelde', 'euprunin', 'github-actions', 'grunweg', 'kbuzzard', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot'] mariainesdff
assignee:mariainesdff
6-11549
6 days ago
6-11549
6 days ago
43-37859
43 days
28035 euprunin
author:euprunin
chore: replace `norm_num` with `simp` where applicable Same motivation as in kim-em's #24064 (chore: replace `norm_num` with `simp` where applicable): > Consider replacing a tactic with a (ahem) simpler alternative. Note that `norm_num` runs `simp` internally, so using `simp` is simply faster. 156/157 Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Star/CHSH.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/Calculus/Deriv/MeanValue.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/ConstantSpeed.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Analysis/Fourier/Inversion.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/InnerProductSpace/Orthonormal.lean,Mathlib/Analysis/InnerProductSpace/TwoDim.lean,Mathlib/Analysis/NormedSpace/ENormedSpace.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/Real/Cardinality.lean,Mathlib/Analysis/Real/Pi/Bounds.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/Analysis/SpecialFunctions/Integrals/PosLogEqCircleAverage.lean,Mathlib/Analysis/SpecialFunctions/JapaneseBracket.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Combinatorics/Additive/SmallTripling.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Bound.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Lemma.lean,Mathlib/Computability/Ackermann.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/Nat/Digits/Div.lean,Mathlib/Data/Real/GoldenRatio.lean,Mathlib/Data/Real/Sign.lean,Mathlib/Geometry/Euclidean/Basic.lean,Mathlib/Geometry/Euclidean/MongePoint.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/SpecificGroups/Alternating/KleinFour.lean,Mathlib/GroupTheory/SpecificGroups/Quaternion.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/RootSystem/Reduced.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean,Mathlib/NumberTheory/ADEInequality.lean,Mathlib/NumberTheory/Bernoulli.lean,Mathlib/NumberTheory/Cyclotomic/Discriminant.lean,Mathlib/NumberTheory/Cyclotomic/PID.lean,Mathlib/NumberTheory/Cyclotomic/Rat.lean,Mathlib/NumberTheory/FactorisationProperties.lean,Mathlib/NumberTheory/Fermat.lean,Mathlib/NumberTheory/FermatPsp.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean,Mathlib/NumberTheory/Harmonic/ZetaAsymp.lean,Mathlib/NumberTheory/LSeries/DirichletContinuation.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/ModularForms/Basic.lean,Mathlib/NumberTheory/ModularForms/LevelOne.lean,Mathlib/NumberTheory/Multiplicity.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/ConvexBody.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/NumberTheory/NumberField/Discriminant/Defs.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Zsqrtd/GaussianInt.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Fintype.lean,Mathlib/RingTheory/Ideal/NatInt.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/ZMod/UnitsCyclic.lean,Mathlib/Tactic/NormNum/LegendreSymbol.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean,Mathlib/Topology/Instances/CantorSet.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean,Mathlib/Topology/Separation/CompletelyRegular.lean 90 22 ['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot'] nobody
6-8850
6 days ago
6-13060
6 days ago
41-30754
41 days
26640 euprunin
author:euprunin
chore(Data): golf `Data/` using `grind` bench-after-CI t-data 10/78 Mathlib/Data/EReal/Operations.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/List/Induction.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/Sigma.lean,Mathlib/Data/PEquiv.lean,Mathlib/Data/PNat/Xgcd.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Data/Set/Lattice.lean 9 29 ['euprunin', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot'] nobody
6-8818
6 days ago
6-16770
6 days ago
74-62480
74 days
27864 BoltonBailey
author:BoltonBailey
feat(Data/{Finset,Multiset}/Sort): give sort functions ≤ default argument Changes the `Finset.sort` and `Multiset.sort` functions to take `≤` as the default relation argument. Then removes this argument where possible through the rest of the library. This involves switching the order of arguments, but I think this is fine, as this function is mostly called by dot notation anyway, and I think it is more typical for the first argument of such functions to have the type that matches the namespace. Thanks to @eric-wieser for suggesting this approach Zulip discussion: [#mathlib4 > Redefine {Fin/Multi}set.sort to take linear order?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Redefine.20.7BFin.2FMulti.7Dset.2Esort.20to.20take.20linear.20order.3F/with/532398325) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 121/97 Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/Multiset/Sort.lean,Mathlib/Data/Nat/Nth.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/Logic/Equiv/Finset.lean,Mathlib/Logic/Equiv/Multiset.lean,Mathlib/NumberTheory/ADEInequality.lean 9 5 ['BoltonBailey', 'eric-wieser', 'github-actions', 'grunweg'] nobody
6-7269
6 days ago
46-16313
1 month ago
46-69850
46 days
29530 ShreckYe
author:ShreckYe
feat(Dynamics/PeriodicPts): some theorems for `Pi.map` in `Dynamics/PeriodicPts` analogous to those for `Prod.map` Split from #29204. Some namespace prefixes are added in `GroupTheory/OrderOfElement.lean` to distinguish the extra imports introduced. - [ ] depends on: #29528 large-import 77/8 Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/GroupTheory/OrderOfElement.lean 3 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
6-7031
6 days ago
6-7414
6 days ago
6-8071
6 days
26398 ChrisHughes24
author:ChrisHughes24
feat(ModelTheory): definable functions --- Possibly this should be generalized to partial functions. I migrated the PR by hand instead of using the script. - [x] depends on: #20166 - [x] depends on: #20161 - [x] depends on: #20115 - [x] depends on: #20174 - [x] depends on: #20175 - [x] depends on: #21948 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-logic 618/0 Mathlib.lean,Mathlib/ModelTheory/FunctionalFormula.lean 2 7 ['ChrisHughes24', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot'] fpvandoorn
assignee:fpvandoorn
6-4670
6 days ago
84-38858
2 months ago
84-39113
84 days
26720 vlad902
author:vlad902
feat(SimpleGraph): lemmas relating edges and darts to the support Useful lemmas to make it easier to pass between the support/edges/darts of a walk. - [ ] depends on: #25812 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 27/0 Mathlib/Combinatorics/SimpleGraph/Walk.lean 1 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] nobody
6-4099
6 days ago
6-11006
6 days ago
6-11089
6 days
26785 TOMILO87
author:TOMILO87
feat: beta distribution Add the Beta distribution to the probability distributions in mathlib4 This PR introduces the Beta distribution on the reals. Main definitions: - betaPDFReal (α β x : ℝ) — the probability density function as a real-valued function - betaPDF (α β x : ℝ) — the pdf as a ℝ≥0∞-valued function - betaMeasure (α β : ℝ) — the probability measure associated with the Beta distribution Main results: - lintegral_betaPDF_eq_one — proof that the pdf integrates to 1 (normalization) - Lemmas on positivity, measurability, and integrability of the pdf - isProbabilityMeasureBeta — the Beta measure is a probability measure Notes: - Follows the general structure of other distributions in mathlib (e.g. Gamma). - Several unused helper lemmas were removed, and proofs streamlined in response to reviewer feedback. - Thanks to @EtienneC30 and @RemyDegenne for detailed reviews across multiple rounds. 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). new-contributor t-measure-probability 206/2 Mathlib.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Probability/Distributions/Beta.lean 4 34 ['EtienneC30', 'RemyDegenne', 'TOMILO87', 'github-actions'] EtienneC30
assignee:EtienneC30
6-3976
6 days ago
32-33357
1 month ago
63-46108
63 days
29569 chrisflav
author:chrisflav
chore(RingTheory/LocalProperties): add algebra versions of exactness lemmas The module variants are less convenient to apply directly in the case of algebras. From Pi1. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory 67/0 Mathlib/RingTheory/LocalProperties/Exactness.lean 1 1 ['github-actions'] nobody
5-74295
5 days ago
5-74295
5 days ago
5-74418
5 days
27956 bryangingechen
author:bryangingechen
feat: automation for removing outdated deprecations This is a new weekly workflow that opens a PR attempting to remove deprecated aliases / declarations older than 6 months and then sends a Zulip message to the `nightly-testing` channel. It also supports being triggered manually with a custom date as well as a "dry-run" mode, which only prints the edits that would be done without actually doing them. cf. [#mathlib reviewers > auto-removing oudated deprecations @ 💬](https://leanprover.zulipchat.com/#narrow/channel/345428-mathlib-reviewers/topic/auto-removing.20oudated.20deprecations/near/532535945) The workflow and shell script are adapted from `nolints.yml` and `scripts/update_nolints_CI.sh`, respectively. The python script was mostly written by Claude, though I did check it. The regex is adapted from ones used in #21271 by YaelDillies and #29287 by kim-em. --- See #29336 for an example of the changes generated by the script. CI 330/0 .github/workflows/remove_deprecated_decls.yml,scripts/README.md,scripts/remove_deprecated_decls.py,scripts/remove_deprecated_decls_CI.sh 4 2 ['bryangingechen', 'github-actions'] robertylewis
assignee:robertylewis
5-67999
5 days ago
13-66119
13 days ago
43-67186
43 days
28571 euprunin
author:euprunin
chore(RingTheory): golf entire `mem_extended_iff`, `coeff_opRingEquiv` and `comp_assoc` using `rfl` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory 4/12 Mathlib/RingTheory/ClassGroup.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/Polynomial/Opposites.lean,Mathlib/RingTheory/PolynomialLaw/Basic.lean 4 7 ['euprunin', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot'] chrisflav
assignee:chrisflav
5-67996
5 days ago
12-78811
12 days ago
22-52446
22 days
29223 dwrensha
author:dwrensha
feat: norm_num extension for abs Adds a `norm_num` extension for the [absolute value operator](https://github.com/leanprover-community/mathlib4/blob/3a941a8fd0acf2b70463b31aeb8ce08bb214a512/Mathlib/Algebra/Order/Group/Unbundled/Abs.lean#L39-L40). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 93/5 Mathlib.lean,Mathlib/Analysis/Complex/ExponentialBounds.lean,Mathlib/Tactic.lean,Mathlib/Tactic/NormNum.lean,Mathlib/Tactic/NormNum/Abs.lean,MathlibTest/norm_num_abs.lean 6 17 ['dwrensha', 'eric-wieser', 'github-actions', 'plp127', 'vihdzp'] adamtopaz
assignee:adamtopaz
5-67992
5 days ago
13-14632
13 days ago
14-77571
14 days
29270 euprunin
author:euprunin
chore: remove redundant `refine` invocations --- **Note:** Although technically redundant, some of these may be worth keeping for readability, or other reasons. Let me know if you think any should stay. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 4/12 Mathlib/Algebra/Order/GroupWithZero/Lex.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/Probability/Density.lean 5 4 ['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] dupuisf
assignee:dupuisf
5-67991
5 days ago
14-73136
14 days ago
14-76515
14 days
29316 euprunin
author:euprunin
chore: remove redundant `suffices` invocations --- **Note:** Although technically redundant, some of these may be worth keeping for readability, or other reasons. Let me know if you think any should stay. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 0/4 Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Determinant.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean 3 4 ['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] tb65536
assignee:tb65536
5-67987
5 days ago
14-16046
14 days ago
14-22057
14 days
27307 xyzw12345
author:xyzw12345
feat(RingTheory/GradedAlgebra): homogeneous relation This PR continues the work from #22279. Original PR: https://github.com/leanprover-community/mathlib4/pull/22279 t-ring-theory 391/0 Mathlib.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousRelation.lean 9 7 ['chrisflav', 'eric-wieser', 'github-actions', 'xyzw12345'] ocfnash
assignee:ocfnash
5-55969
5 days ago
44-7976
1 month ago
59-19296
59 days
29310 Louddy
author:Louddy
feat(SkewMonoidAlgebra): algebra instance Algebra instance for skew monoid algebras. 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$
65/12 Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean 1 2 ['github-actions', 'mathlib4-merge-conflict-bot'] nobody
5-25717
5 days ago
5-25745
5 days ago
13-2575
13 days
29587 uniwuni
author:uniwuni
feat(GroupTheory/Finiteness): define finitely generated semigroups We define finitely generated semigroups and basics similarly to monoids and groups and prove that semigroups and monoids remain finitely generated when a congruence is quotiented out. This will be important when further developing semigroup theory. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 259/14 Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/GroupTheory/Finiteness.lean 2 3 ['github-actions', 'plp127', 'uniwuni'] nobody
5-22452
5 days ago
5-27776
5 days ago
5-27757
5 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$
205/6 Mathlib.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/ENat/Pow.lean,Mathlib/SetTheory/Cardinal/Finite.lean 4 17 ['D-Thomine', 'eric-wieser', 'github-actions', 'kbuzzard', 'mathlib4-merge-conflict-bot'] kbuzzard
assignee:kbuzzard
5-5494
5 days ago
28-10612
28 days ago
57-17851
57 days
28818 NotWearingPants
author:NotWearingPants
feat(Data/Setoid/Basic): add theorems about lifting a function to its kernel Currently `ker_lift_injective` and `quotientKerEquivOfRightInverse` lift `f` to `ker f` in their definition. This PR makes this function available as `Setoid.ker_lift f` and adds a few more theorems about it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor easy 28/13 Counterexamples/AharoniKorman.lean,Mathlib/Data/Setoid/Basic.lean 2 3 ['NotWearingPants', 'github-actions', 'mathlib4-merge-conflict-bot'] nobody
5-5035
5 days ago
5-5087
5 days ago
23-20030
23 days
29241 yoh-tanimoto
author:yoh-tanimoto
feat(Analysis/InnerProductSpace/Orthogonal): add duplicates for `ClosedSubmodule` add duplicates of definitions and API's for `ClosedSubmodule` in an `InnerProductSpace`. motivation: when one considers a Hilbert space (`CompleteSpace`), it is more natural to consider `ClosedSubmodule`s. They form a complete lattice and satisfy `sup_orthogonal` #29243. - [x] depends on: #29230 for `Lattice` `CompleteLattice` 191/0 Mathlib/Analysis/InnerProductSpace/Orthogonal.lean 1 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
5-4768
5 days ago
5-11143
5 days ago
5-11629
5 days
29235 yoh-tanimoto
author:yoh-tanimoto
feat(Topology/Algebra/Module/ClosedSubmodule): add `mapEquiv`, a variation of `ClosedSubmodule.map` for CLE add `ClosedSubmodule.map` for continuous linear equivalence. In this case, a closed map is mapped to a closed map, so the definitions are easier and behave nicely with `closure` and `⊔`. motivation: needed to define standard subspaces in a Hilbert space (scalar multiplication by `Complex.I`) #29251 https://ems.press/content/serial-article-files/48171 - [x] depends on: #29230 for `Lattice` `CompleteLattice` t-topology 69/1 Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean 1 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
5-4756
5 days ago
5-11141
5 days ago
5-13432
5 days
29513 grunweg
author:grunweg
fix(lint-style): parse linter options and load environment extensions correctly Parse options and load linter set extension correctly. This fixes two issues: - We never called the `toOptions` function that parses Lakefile options into a `Lean.Options` structure: the function we use instead is only meant for command-line options and doesn't handle the `weak.` prefix correctly. - The way we load linter sets was incorrect: `withImportModules` doesn't update any environment extensions, and that is exactly what we use to store linter sets. We can replace it with `importModules` instead, but that is a bit less safe. It would be great if we had some sort of macro that can give us the environment at the point of elaboration instead. TODO: that is now wrong, update the description to be correct! --- - [x] depends on: #29584 - [x] depends on: #29585 - [x] depends on: #29586 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 10/8 scripts/lint-style.lean 1 7 ['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot'] nobody
4-82255
4 days ago
4-82449
4 days ago
4-85049
4 days
28061 CoolRmal
author:CoolRmal
feat(MeasureTheory): Uniqueness of Measures in the Riesz–Markov–Kakutani Representation Theorem This PR adds the proof of the uniqueness of measures in the Riesz–Markov–Kakutani representation theorem (i.e. if two regular measures on a locally compact Hausdorff space induce the same linear functionals on the set of compactly supported continuous functions, then these two measures are equal). cf. https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Uniqueness.20in.20Riesz.E2.80.93Markov.E2.80.93Kakutani.20representation.20theorem --- - [ ] depends on: #28059 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 182/0 Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/NNReal.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/Topology/UrysohnsLemma.lean 4 12 ['CoolRmal', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] RemyDegenne
assignee:RemyDegenne
4-68006
4 days ago
11-70751
11 days ago
11-76322
11 days
28695 chrisflav
author:chrisflav
feat(RingTheory): meta properties of bijective ring homomorphisms In particular, we show that bijective is a property local on the (algebraic) source. --- - [x] depends on: #28642 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory large-import 170/7 Mathlib.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/RingTheory/LocalProperties/Exactness.lean,Mathlib/RingTheory/LocalRing/ResidueField/Instances.lean,Mathlib/RingTheory/Localization/Algebra.lean,Mathlib/RingTheory/Localization/Away/Basic.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/RingHom/Bijective.lean,Mathlib/RingTheory/TensorProduct/Basic.lean 11 2 ['github-actions', 'mathlib4-dependent-issues-bot'] kbuzzard
assignee:kbuzzard
4-68005
4 days ago
15-1264
15 days ago
15-4310
15 days
29322 xroblot
author:xroblot
feat(RingTheory/Localization/AtPrime): bijection between prime ideals Let `R ⊆ S` be an extension of rings and `p` be a prime ideal of `R`. Denote by `Rₚ` the localization of `R` at the complement of `p` and by `Sₚ` the localization of `S` at the (image) of the complement of `p`. In this PR, we study the extension `Rₚ ⊆ Sₚ` and the relation between the (nonzero) prime ideals of `Sₚ` and the prime ideals of `S` above `p`. In particular, we prove that (under suitable conditions) they are in bijection. In a following PR #27706, we prove that the residual degree and ramification index are preserved by this bijection. Note. The new file `RingTheory.Localization.AtPrime.Extension` is imported in `RingTheory.Trace.Quotient` because one function from the latter was moved to the former, but the plan is eventually to move the isomorphisms proved in `RingTheory.Trace.Quotient` to `RingTheory.Localization.AtPrime.Basic` and `RingTheory.Localization.AtPrime.Extension` where they belong. This will be done in #27706. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory 145/8 Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Instances.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Localization/AtPrime/Extension.lean,Mathlib/RingTheory/Trace/Quotient.lean 6 1 ['github-actions'] chrisflav
assignee:chrisflav
4-68004
4 days ago
14-13720
14 days ago
14-13760
14 days
29361 FlAmmmmING
author:FlAmmmmING
feat(RingTheory/PowerSeries/Catalan.lean) We introduce the Catalan generating function as a formal power series over `ℕ`. ## Main Definitions * `PowerSeries.catalanSeries`: The Catalan generating function as a power series. ## Main Results * `PowerSeries.sum_coeff_X_catalanSeries`: When `n` is a natural number, each term in the sum `coeff i X * catalan (n - i)` is 0 except for `i = 1`. * `PowerSeries.coeff_X_mul_catalanSeries`: The coefficient of `X * catalanSeries` at `X^n` is `catalan (n - 1)` when `n > 0`. * `PowerSeries.catalanSeries_one_add_X_mul_self_sq`: The Catalan generating function satisfies the equation `catalanSeries = 1 + X * catalanSeries ^ 2`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory new-contributor 89/0 Mathlib.lean,Mathlib/RingTheory/PowerSeries/Catalan.lean 2 2 ['github-actions', 'wwylele'] kbuzzard
assignee:kbuzzard
4-68002
4 days ago
12-40665
12 days ago
12-40700
12 days
27599 mitchell-horner
author:mitchell-horner
feat(Combinatorics/SimpleGraph): define `CompleteEquipartiteSubgraph` Define the complete equipartite subgraphs in `r` parts each of size `t` in `G` as the `r` subsets of vertices each of size `t` such that vertices in distinct subsets are adjacent. In this case `Nonempty (G.CompleteEquipartiteSubgraph r t)` is equivalent to `completeEquipartiteGraph r t ⊑ G`, that is, finding `r` subsets of vertices each of size `t` in `G` such that vertices in distinct subsets are adjacent is equivalent to finding an injective homomorphism from `completeEquipartiteGraph r t` to `G`. --- - [x] depends on: #27597 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 113/7 Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean 1 19 ['YaelDillies', 'b-mehta', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mitchell-horner'] YaelDillies
assignee:YaelDillies
4-35095
4 days ago
14-17357
14 days ago
22-61098
22 days
27602 mitchell-horner
author:mitchell-horner
feat(Combinatorics/SimpleGraph): define `CompleteBipartiteSubgraph` Define the complete bipartite subgraphs of `s` and `t` parts as a "left" subset of `s` vertices and a "right" subset of `t` vertices such that every vertex in the "left" subset is adjacent to every vertex in the "right" subset. In this case `Nonempty (G.CompleteBipartiteSubgraph (card α) (card β))` is equivalent to `completeBipartiteGraph α β ⊑ G`, that is, finding a "left" subset of `s` vertices and a "right" subset of `t` vertices such that every vertex in the "left" subset is adjacent to every vertex in the "right" subset is equivalent to finding an injective homomorphism `completeBipartiteGraph α β` to `G`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 88/0 Mathlib/Combinatorics/SimpleGraph/Bipartite.lean 1 3 ['github-actions', 'mitchell-horner', 'vlad902'] YaelDillies
assignee:YaelDillies
4-34446
4 days ago
51-7580
1 month ago
51-7627
51 days
29278 Jlh18
author:Jlh18
feat: groupoid instance on quotient category Show that `CategoryTheory.Quotient` constructs a groupoid when the original category was a groupoid. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import new-contributor t-category-theory 30/0 Mathlib/CategoryTheory/Quotient.lean 1 5 ['Jlh18', 'github-actions', 'joelriou', 'riccardobrasca'] riccardobrasca
assignee:riccardobrasca
4-25912
4 days ago
5-80042
5 days ago
14-27069
14 days
28329 pechersky
author:pechersky
feat(RingTheory/Valuation): generalize CommGroupWithZero on mrange to MonoidWithZeroHom Before, they were only for Valuation, but that is too restricted --- [![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$
77/27 Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/GroupWithZero/Submonoid/Instances.lean,Mathlib/RingTheory/Valuation/Archimedean.lean,Mathlib/RingTheory/Valuation/Basic.lean 5 11 ['YaelDillies', 'eric-wieser', 'github-actions', 'pechersky', 'riccardobrasca'] YaelDillies
assignee:YaelDillies
4-25448
4 days ago
23-52541
23 days ago
31-80895
31 days
26096 vasnesterov
author:vasnesterov
feat(Topology/Instances): Cantor set is the set of ternary numbers without `1`s * Prove `ofDigits_zero_two_sequence_mem_cantorSet`: If `x = 0.d₀d₁...` in base-3, and none of the digits `dᵢ` is `1`, then `x` belongs to the Cantor set. * Prove `ofDigits_zero_two_sequence_unique`: such a representation is uniquie. * Define `toTernary` which converts a real number from the Cantor set to its ternary representation without `1`s. * Prove `ofDigits_cantorToTernary : ofDigits (cantorToTernary x) = x`. --- This is a prerequisite for #26136. - [x] depends on: #26001 - [x] depends on: #26021 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-topology 231/0 Mathlib/Topology/Instances/CantorSet.lean,scripts/noshake.json 2 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
4-13680
4 days ago
5-80526
5 days ago
5-80887
5 days
28477 yapudpill
author:yapudpill
feat(RingTheory): golf `IsPrincipalIdealRing.of_prime` In complement to #28451 and as discussed in #27200, this PR uses the newly added Oka predicates to golf the proof of `IsPrincipalIdealRing.of_prime`. --- - [x] depends on: #28525 - [x] depends on: #29567 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory new-contributor 53/55 Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/PrincipalIdealDomainOfPrime.lean 2 11 ['Ruben-VandeVelde', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'yapudpill'] nobody
4-8289
4 days ago
4-71278
4 days ago
10-61594
10 days
24184 YaelDillies
author:YaelDillies
feat: `[G : H]` notation for the index of `H : Subgroup G` This is a cute notation which I wrote for FLT. Not sure whether we want it in mathlib nor how to include `relindex` in the picture. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra RFC
label:t-algebra$
5/0 Mathlib/GroupTheory/Index.lean 1 8 ['YaelDillies', 'erdOne', 'github-actions', 'j-loreaux', 'kbuzzard', 'mathlib4-merge-conflict-bot'] eric-wieser
assignee:eric-wieser
4-2891
4 days ago
4-2916
4 days ago
151-77035
151 days
29611 vihdzp
author:vihdzp
feat: alternate characterization of `≤` on Archimedean classes The definition of `mk x ≤ mk y` is that `|y| ≤ n * |x|` for some natural `n`. We prove the alternate characterization that `q * |y| ≤ |x|` for some positive rational `q`, and in fact prove a more general version for any densely ordered Archimedean ring. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
26/1 Mathlib/Algebra/Order/Ring/Archimedean.lean 1 5 ['github-actions', 'mathlib4-merge-conflict-bot', 'vihdzp', 'wwylele'] nobody
3-84702
3 days ago
4-7511
4 days ago
4-50824
4 days
27936 alreadydone
author:alreadydone
feat(Algebra): additivize Dvd and Prime `Prime` can't be directly additivized, so we introduce `Preprime`, which drops the `≠ 0` condition, and additivize it to `AddPrime`. To show that `Preprime` is a reasonable definition, we show its connection to `Irreducible` under `IsPrimal` and `IsRegular` conditions. We also show that an element in a product monoid is preprime iff one component is a unit and the other is preprime, and the same with `Preprime` replaced by `Irreducible`. Also additivize `IsPrimal`, `IsRelPrime` and `DecompositionMonoid`. The motivation is that the primality of `single g 1` in `AddMonoidAlgebra k G` is connected to the primality of `g` in `G`. --- I've checked [all 29 files](https://github.com/search?q=repo%3Aleanprover-community%2Fmathlib4%20%E2%88%A3%20to_additive&type=code) containing the `∣` symbol and the `to_additive` attribute and fixed the wrongly translated (`dvd` to `addDvd`) names. TODO: connect (Add)Dvd to [ExistsMul/AddOfLE](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Monoid/Unbundled/ExistsOfLE.html#ExistsMulOfLE) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
400/191 Mathlib.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/Divisibility/Basic.lean,Mathlib/Algebra/Divisibility/Finite.lean,Mathlib/Algebra/Divisibility/Hom.lean,Mathlib/Algebra/Divisibility/Prod.lean,Mathlib/Algebra/Divisibility/Units.lean,Mathlib/Algebra/Group/Action/Pointwise/Finset.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/GroupWithZero/Associated.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Prime/Defs.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Prime/Prod.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/GroupTheory/Coset/Card.lean,Mathlib/GroupTheory/Exponent.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/GroupTheory/GroupAction/Period.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/GroupTheory/Schreier.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/Tactic/ToAdditive/GuessName.lean 30 11 ['JovanGerb', 'adomani', 'alreadydone', 'bryangingechen', 'github-actions', 'mathlib4-merge-conflict-bot'] bryangingechen
assignee:bryangingechen
3-81558
3 days ago
4-2305
4 days ago
42-51592
42 days
29622 uniwuni
author:uniwuni
feat(RepresentationTheory/Commutative): simple representations of commutative monoids are 1-dimensional Shows that for a commutative monoid, the simple finite dimensional representations over algebraically closed fields are all 1-dimensional. --- Some things in here I am a bit uncomfortable with. `FDRep` seems to be not particularly fleshed out yet, so I had to explicitly construct embeddings and so on instead of using `Rep.subrepresentation`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
81/1 Mathlib.lean,Mathlib/RepresentationTheory/Commutative.lean,docs/undergrad.yaml 3 1 ['github-actions'] nobody
3-80237
3 days ago
4-3942
4 days ago
4-3984
4 days
27252 Parcly-Taxel
author:Parcly-Taxel
feat: sharp bounds for `‖exp (I * x) - 1‖` when `x` is real From Carleson carleson t-analysis 44/0 Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean 2 13 ['Parcly-Taxel', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot'] hrmacbeth
assignee:hrmacbeth
3-67980
3 days ago
11-34005
11 days ago
12-40466
12 days
29055 vihdzp
author:vihdzp
feat: `Ordinal.toENat` We essentially copy the Cardinal/ENat file but make it for ordinals instead. See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2317758.20Ordinal.2EtoENat/near/479768508) for some prior discussion on this PR (particularly, the duplication and how there's no easy way to resolve it.) --- Moved from #17758. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-set-theory 292/0 Mathlib.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/SetTheory/Cardinal/ENat.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/ENat.lean 6 1 ['github-actions'] alreadydone
assignee:alreadydone
3-67978
3 days ago
20-34210
20 days ago
20-34232
20 days
29271 euprunin
author:euprunin
chore: remove redundant `let` and `letI` invocations --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge 1/8 Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/CategoryTheory/Monoidal/Grp_.lean,Mathlib/ModelTheory/Algebra/Ring/FreeCommRing.lean,Mathlib/Topology/Metrizable/Uniformity.lean 5 10 ['JovanGerb', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'ocfnash'] dupuisf
assignee:dupuisf
3-67977
3 days ago
11-30184
11 days ago
14-76165
14 days
29087 dupuisf
author:dupuisf
feat: Define strictly positive operators (i.e. positive definite) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
192/21 Mathlib.lean,Mathlib/Algebra/Algebra/StrictPositivity.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean,Mathlib/Topology/UniformSpace/Real.lean 7 22 ['dupuisf', 'github-actions', 'themathqueen'] kim-em
assignee:kim-em
3-67449
3 days ago
17-76308
17 days ago
17-76290
17 days
29027 grunweg
author:grunweg
feat/fix(FlexibleLinter): mark more tactics as flexible and add proper tests for all of these. In particular, this PR - fixes the handling of `(n)linarith` (which had a bug), and adds a test, - adds `ring!` and `abel!` (as flexible tactics), - adds `ring_nf!` and `abel_nf!` as stopper tactics, - adds `cfc_tac` and its sisters as flexible tactic (as they use aesop and/or fun_prop), - adds `continuity` and `measurability` as flexible (as they are aesop-based), - add `group` and `module` as flexible, - add `grind` as flexible, - add `positivity` and `finiteness` as flexible, and `finiteness_nonterminal` as stopper tactic. I'm happy to discuss any of these particular additions further. --- Zulip discussion at https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/flexible.20vs.20rigid.20tactics/with/536424236. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-linter 232/56 Mathlib/Tactic/Linter/FlexibleLinter.lean,MathlibTest/FlexibleLinter.lean,MathlibTest/ImportHeavyFlexibleLinter.lean 3 17 ['adomani', 'b-mehta', 'github-actions', 'grunweg'] b-mehta and joneugster
assignee:joneugster assignee:b-mehta
3-62364
3 days ago
21-8632
21 days ago
21-8613
21 days
29479 harahu
author:harahu
doc: move docstring references to definitions to correct locations This addresses some instances of docstrings referring to results that have been moved away form their prior locations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-computability 14/20 Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean 3 7 ['bjoernkjoshanssen', 'bryangingechen', 'github-actions', 'harahu', 'mathlib4-merge-conflict-bot'] nobody
3-44391
3 days ago
7-44435
7 days ago
7-85057
7 days
29256 harahu
author:harahu
doc: attach "quasi" as a prefix where it is currently freestanding Quasi is rarely used as a free-standing adjective. Rather, it is commonly understood as just a prefix modifying some other concept. This PR takes this into account by attaching the prefix to whatever it is modifying. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-dynamics t-measure-probability 25/25 Mathlib/AlgebraicGeometry/Morphisms/Descent.lean,Mathlib/Dynamics/BirkhoffSum/QuasiMeasurePreserving.lean,Mathlib/Dynamics/Ergodic/Ergodic.lean,Mathlib/Dynamics/Ergodic/Function.lean,Mathlib/GroupTheory/GroupAction/DomAct/Basic.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/AEEqFun/DomAct.lean,Mathlib/MeasureTheory/Group/AEStabilizer.lean,Mathlib/MeasureTheory/Measure/QuasiMeasurePreserving.lean,Mathlib/MeasureTheory/Measure/Restrict.lean 10 2 ['MichaelStollBayreuth', 'github-actions'] nobody
3-43913
3 days ago
6-38200
6 days ago
15-4485
15 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 64 ['FLDutchmann', 'Paul-Lez', 'YaelDillies', 'eric-wieser', 'github-actions', 'grunweg', 'kckennylau', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud'] eric-wieser
assignee:eric-wieser
3-36465
3 days ago
154-34697
5 months ago
209-81813
209 days
29297 harahu
author:harahu
doc: hyphenate "first order" and "higher order" when used attributively Compound adjectives that are attributive (coming before their noun) should almost always be hyphenated in English. This PR covers "first order" and "higher order". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge 24/24 Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/FieldTheory/AxGrothendieck.lean,Mathlib/Logic/Basic.lean,Mathlib/ModelTheory/Algebra/Field/Basic.lean,Mathlib/ModelTheory/Algebra/Field/CharP.lean,Mathlib/ModelTheory/Algebra/Field/IsAlgClosed.lean,Mathlib/ModelTheory/Algebra/Ring/Basic.lean,Mathlib/RingTheory/MvPolynomial/FreeCommRing.lean,Mathlib/Topology/VectorBundle/Riemannian.lean,docs/undergrad.yaml 11 3 ['github-actions', 'grunweg'] nobody
3-31182
3 days ago
6-39390
6 days ago
14-41035
14 days
29538 YaelDillies
author:YaelDillies
refactor(FractionalIdeal): use algebraic order theory API Instantiate instances earlier and use generic lemmas instead of the `FractionalIdeal`-specific ones. Also rename `_nonzero` in lemma names to `_ne_zero`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory 158/176 Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Factorization.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Basic.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/FractionalIdeal/Basic.lean,Mathlib/RingTheory/FractionalIdeal/Inverse.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean 8 1 ['github-actions'] nobody
3-20751
3 days ago
3-23685
3 days ago
3-23674
3 days
29347 themathqueen
author:themathqueen
refactor(Algebra/Star/StarAlgHom): let `StarAlgEquiv` extend `StarRingEquiv` instead of `RingEquiv` Instead of having `StarAlgEquiv` extend `RingEquiv` and have properties `map_star'` and `map_smul'`, it now extends `StarRingEquiv` with only `map_smul'`. --- Will add more API in the next PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
29/36 Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean 2 4 ['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] kbuzzard
assignee:kbuzzard
3-18320
3 days ago
10-80908
10 days ago
13-17467
13 days
27313 pechersky
author:pechersky
feat(RingTheory/ValuativeRel/Trivial): the trivial valuative relation lemmas stated using `[Valuation.Compatible (1 : Valuation R Γ₀)]` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #27312 - [x] depends on #28890 t-algebra t-number-theory
label:t-algebra$
103/0 Mathlib.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Trivial.lean 3 18 ['faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky'] riccardobrasca
assignee:riccardobrasca
3-16069
3 days ago
21-1545
21 days ago
29-69230
29 days
26345 mans0954
author:mans0954
feat(Analysis/LocallyConvex/Polar): Bipolar theorem The bipolar theorem states that the polar of the polar of a set `s` is equal to the closed absolutely convex hull of `s`. The argument here follows Conway, Chapter V. 1.8. This PR continues the work from #20843. Original PR: https://github.com/leanprover-community/mathlib4/pull/20843 - [x] depends on: #27316 large-import t-analysis 328/93 Mathlib.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/Bipolar.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/LocallyConvex/WeakDual.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Topology/Algebra/Module/LinearSpan.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakBilin.lean 9 n/a ['JonBannon', 'eric-wieser', 'faenuccio', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mans0954', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mcdoll'] nobody
3-10015
3 days ago
unknown
unknown
29156 harahu
author:harahu
doc: treat "non" as a prefix where it appears as a free-standing word In English, "non" is merely a prefix, not a word in itself. Hence, it should always be attached to another word, either directly or by hyphen. This PR attaches the prefix "non" to whatever it is prefixing in the cases where it currently appears as a free-standing word. There's a couple of tricky cases in the PR that needs some extra attention. I will call these out by review comments. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 89/89 Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Order/Sub/Basic.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Star/CentroidHom.lean,Mathlib/AlgebraicTopology/DoldKan/Degeneracies.lean,Mathlib/Analysis/Complex/Arg.lean,Mathlib/Analysis/Complex/Polynomial/Basic.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Unbundled/RingSeminorm.lean,Mathlib/Analysis/SpecialFunctions/NonIntegrable.lean,Mathlib/CategoryTheory/Closed/Ideal.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Mod_.lean,Mathlib/CategoryTheory/SmallObject/Iteration/Basic.lean,Mathlib/Combinatorics/Additive/AP/Three/Defs.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Data/Finsupp/Weight.lean,Mathlib/FieldTheory/Finite/GaloisField.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/CompleteBooleanAlgebra.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/Partition/Finpartition.lean,Mathlib/Order/SuccPred/Archimedean.lean,Mathlib/Order/SuccPred/Basic.lean,Mathlib/Order/TransfiniteIteration.lean,Mathlib/Probability/ProductMeasure.lean,Mathlib/RingTheory/KrullDimension/NonZeroDivisors.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Defs.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean,Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean,Mathlib/RingTheory/MvPowerSeries/Order.lean,Mathlib/RingTheory/OrderOfVanishing.lean,Mathlib/RingTheory/Polynomial/Eisenstein/Criterion.lean,Mathlib/RingTheory/Regular/IsSMulRegular.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Baire/BaireMeasurable.lean,Mathlib/Topology/Connected/LocallyConnected.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean,Mathlib/Topology/Sets/Compacts.lean 51 72 ['github-actions', 'grunweg', 'harahu', 'mathlib4-merge-conflict-bot'] nobody
3-5855
3 days ago
3-5873
3 days ago
15-21594
15 days
29649 MichaelStollBayreuth
author:MichaelStollBayreuth
feat(Analysis/Normed/Algebra/GelfandMazur): new file This adds two version of the *Gelfand-Mazur* *Theorem*: ```lean NormedAlgebra.Complex.nonempty_algEquiv (F : Type*) [NormedRing F] [NormOneClass F] [NormMulClass F] [NormedAlgebra ℂ F] [Nontrivial F] : Nonempty (ℂ ≃ₐ[ℂ] F) NormedAlgebra.Real.nonempty_algEquiv_or (F : Type*) [NormedField F] [NormedAlgebra ℝ F] : Nonempty (F ≃ₐ[ℝ] ℝ) ∨ Nonempty (F ≃ₐ[ℝ] ℂ) ``` The version for complex algebras differs in its assumptions from the existing version [NormedRing.algEquivComplexOfComplete](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Normed/Algebra/Spectrum.html#NormedRing.algEquivComplexOfComplete) (nontrivial normed algebra with multiplicative norm vs. complete division ring with submultiplicative norm). A version for real algebras is not yet in Mathlib; it is needed in the context of implementing (absolute) heights; see [Heights](https://github.com/MichaelStollBayreuth/Heights). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 367/0 Mathlib.lean,Mathlib/Analysis/Normed/Algebra/GelfandMazur.lean 2 1 ['github-actions'] nobody
3-14
3 days ago
3-52
3 days ago
3-65
3 days
27107 AntoineChambert-Loir
author:AntoineChambert-Loir
feat(GroupTheory/GroupAction/SubMulAction/Combination) : combinations and group actions `Nat.Combination X n` is the type all `s : Finset X` such that `s.card = n`. This PR provides some API for this subtype and the `SubMulAction` it inherits when a group acts on `X`. It will be used in conjunction with the description of some maximal subgroups of `Equiv.Perm X` to construct primitive actions. Question on the names: when `X` is a fintype, there is `Finset.powersetCard` that gives the same object, as a `Finset`. But the present PR also applies when `X` is infinite. Then maybe `Nat.Combination` should be renamed as `Set.powersetCard`? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-group-theory 325/0 Mathlib.lean,Mathlib/Data/Fintype/EquivFin.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/Combination.lean 4 39 ['AntoineChambert-Loir', 'alreadydone', 'github-actions', 'tb65536'] alreadydone
assignee:alreadydone
2-82505
2 days ago
43-36427
1 month ago
65-66172
65 days
29656 jsm28
author:jsm28
feat(Geometry/Euclidean/Angle/Bisector): bisecting angles and equal distances Prove a lemma ```lean /-- A point `p` is equidistant to two affine subspaces if and only if the angles at a point `p'` in their intersection between `p` and its orthogonal projections onto the subspaces are equal. -/ lemma dist_orthogonalProjection_eq_iff_angle_eq {p p' : P} {s₁ s₂ : AffineSubspace ℝ P} [s₁.direction.HasOrthogonalProjection] [s₂.direction.HasOrthogonalProjection] (hp' : p' ∈ s₁ ⊓ s₂) : haveI : Nonempty s₁ := ⟨p', hp'.1⟩ haveI : Nonempty s₂ := ⟨p', hp'.2⟩ dist p (orthogonalProjection s₁ p) = dist p (orthogonalProjection s₂ p) ↔ ∠ p p' (orthogonalProjection s₁ p) = ∠ p p' (orthogonalProjection s₂ p) := by ``` that gives the basic fact relating equal distances to affine subspaces, and bisecting angles involving those subspaces, needed to connect `incenter` and `excenter` to bisecting angles. (Other pieces involved in getting such a statement for angles involving vertices of a triangle rather than just touchpoints include #29410, #29413, #29418 and their dependencies.) I expect the new file `Bisector.lean` to be an appropriate place to end up with actual definitions of bisectors as submodules and affine subspaces; those definitions aren't needed for my immediate goals with `incenter` and `excenter`, but it seems appropriate to use such a file for lemmas relating to bisectors whether or not they explicitly involve such definitions. I do expect to add similar statements involving oriented angles in a followup, so the imports of this new file should be expected to increase. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-euclidean-geometry 114/0 Mathlib.lean,Mathlib/Geometry/Euclidean/Angle/Bisector.lean 2 1 ['github-actions'] nobody
2-68043
2 days ago
2-68112
2 days ago
2-68094
2 days
26544 vihdzp
author:vihdzp
feat(SetTheory/ZFC/Ordinal): Lean ordinals to ZFC ordinals We define `Ordinal.toZFSet` and prove that its outputs are precisely the ZFC ordinals. Moved from #19985. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-set-theory 166/5 Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Ordinal.lean,Mathlib/SetTheory/ZFC/PSet.lean,Mathlib/SetTheory/ZFC/Rank.lean 4 23 ['alreadydone', 'github-actions', 'leanprover-community-bot-assistant', 'staroperator', 'vihdzp'] b-mehta
assignee:b-mehta
2-67973
2 days ago
10-36531
10 days ago
37-13892
37 days
29400 ShreckYe
author:ShreckYe
feat(`Algebra/BigOperators`): products of the results of insertion and removal on tuples and lists, and some needed lemmas large-import 102/0 Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BigOperators/Group/Vector/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean 6 5 ['ShreckYe', 'eric-wieser', 'github-actions'] bryangingechen
assignee:bryangingechen
2-67969
2 days ago
10-29377
10 days ago
10-29425
10 days
29409 Julian
author:Julian
feat(Mathlib/Analysis): deriv_eq_self and deriv_exp_iff --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 32/0 Mathlib/Analysis/SpecialFunctions/ExpDeriv.lean 1 2 ['eric-wieser', 'github-actions'] j-loreaux
assignee:j-loreaux
2-67966
2 days ago
9-83195
9 days ago
9-83239
9 days
29413 jsm28
author:jsm28
refactor(Geometry/Euclidean/Altitude,Geometry/Euclidean/Incenter): use `Nat.AtLeastTwo` Using `[Nat.AtLeastTwo n]` in place of `(hn : 1 < n)` saves passing various explicit hypotheses around, and is convenient in particular if applying lemmas in the common use case of a triangle. As discussed on Zulip, `AtLeastTwo` is mainly used with literals at present, and there is no clear consensus about broader use in groups of lemmas sharing a common value of `n`, but `NeZero` is used in a similar way in the `rootsOfUnity` API. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-euclidean-geometry 23/21 Mathlib/Geometry/Euclidean/Altitude.lean,Mathlib/Geometry/Euclidean/Incenter.lean 2 4 ['eric-wieser', 'github-actions', 'jsm28'] JovanGerb
assignee:JovanGerb
2-67965
2 days ago
9-79629
9 days ago
9-79611
9 days
28484 euprunin
author:euprunin
chore(Data): golf entire `toReal_eq_toReal`, `count_eq_of_nodup`, `smul_mat_cons` and `coe_inj` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 8/13 Mathlib/Combinatorics/Matroid/Minor/Restrict.lean,Mathlib/Data/ENNReal/Real.lean,Mathlib/Data/List/Nodup.lean,Mathlib/LinearAlgebra/Matrix/Notation.lean 4 6 ['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot'] nobody
2-51966
2 days ago
19-52968
19 days ago
32-67593
32 days
29364 hrmacbeth
author:hrmacbeth
feat(Tactic/FieldSimp): handle inequalities This PR extends the `field_simp` tactic to cancel positive denominators in inequalities, by analogy with the existing behaviour of cancelling nonzero denominators in equalities. For example, `field_simp` now reduces the following goal (from `Mathlib.Analysis.Convex.Mul`): ``` x y a b : ℚ hx : 0 < x hy : 0 < y ha : 0 < a hb : 0 < b ⊢ (a * x + b * y)⁻¹ ≤ a * x⁻¹ + b * y⁻¹ ``` to `⊢ x * y ≤ (a * x + b * y) * (a * y + x * b)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-meta 279/87 Mathlib.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Convex/Continuous.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/RingTheory/RootsOfUnity/Complex.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FieldSimp.lean,Mathlib/Tactic/FieldSimp/Attr.lean,Mathlib/Tactic/FieldSimp/Lemmas.lean,MathlibTest/FieldSimp.lean,scripts/noshake.json 14 3 ['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot'] nobody
2-51571
2 days ago
3-71494
3 days ago
9-41875
9 days
29636 harahu
author:harahu
doc: spell semiring in closed form My impression of the literature is that it is quite uncommon to spell "semiring" as "semi-ring". In mathlib there is only 14 cases of "semi-ring", as opposed to ~1400 cases of "semiring" in docstrings. I figure that standardizing on "semiring" will help improve search-ability of mathlib somewhat. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 14/14 Mathlib/Algebra/Star/CentroidHom.lean,Mathlib/MeasureTheory/Measure/AddContent.lean,Mathlib/MeasureTheory/SetSemiring.lean,Mathlib/RingTheory/MvPowerSeries/Basic.lean 4 2 ['alreadydone', 'github-actions'] nobody
2-42555
2 days ago
3-30469
3 days ago
3-30450
3 days
28432 euprunin
author:euprunin
chore(CategoryTheory/Monoidal): golf entire `counitInv_app_comp_functor_map_η_inverse` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 2/5 Mathlib/CategoryTheory/Monoidal/Functor.lean 1 1 ['github-actions'] adamtopaz
assignee:adamtopaz
2-42172
2 days ago
34-917
1 month ago
34-963
34 days
22043 YaelDillies
author:YaelDillies
chore: shortcut instance for `Neg ℤˣ` This lets us avoid importing `Ring` in downstream files (most of the effect is to come). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) file-removed t-algebra
label:t-algebra$
20/47 Mathlib.lean,Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/Group/Int/Units.lean,Mathlib/Algebra/Order/Ring/Abs.lean,Mathlib/Algebra/Ring/Int/Units.lean,Mathlib/Algebra/Ring/NegOnePow.lean,Mathlib/Data/Fintype/Units.lean,Mathlib/Data/Int/AbsoluteValue.lean,Mathlib/Data/Int/Associated.lean,Mathlib/GroupTheory/HNNExtension.lean,Mathlib/NumberTheory/NumberField/Basic.lean,MathlibTest/Zify.lean 12 17 ['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors'] eric-wieser
assignee:eric-wieser
2-40386
2 days ago
126-23423
4 months ago
210-82853
210 days
29253 FernandoChu
author:FernandoChu
feat(CategoryTheory): (Co)limits in preorders Characterize (co)limits in preorders as glbs/lubs, plus some other instances. new-contributor t-category-theory 151/13 Mathlib/CategoryTheory/Discrete/Basic.lean,Mathlib/CategoryTheory/Limits/Preorder.lean 2 10 ['FernandoChu', 'github-actions', 'joelriou'] joelriou
assignee:joelriou
2-40381
2 days ago
2-44528
2 days ago
13-38837
13 days
29646 jessealama
author:jessealama
feat(Algebra/Homology): add Euler characteristic definition for chain complexes This PR adds a definition of the Euler characteristic for chain complexes. The definition computes the Euler characteristic up to index n as the alternating sum ∑_{k=0}^n (-1)^k rank(C_k). It works over any ring R (using `Module.finrank`). I'm interested in feedback on whether this is the right level of generality and whether the parameterization by index `n` is the preferred approach. This definition is extracted from work on PR #29639 (Euler's polyhedron formula). This is a minimal PR containing only the definition - I thought it might be useful to discuss the design before adding lemmas and theorems. new-contributor t-algebra
label:t-algebra$
73/0 Mathlib.lean,Mathlib/Algebra/Homology/EulerCharacteristic.lean 2 9 ['github-actions', 'jessealama', 'joelriou'] nobody
2-40326
2 days ago
2-81394
2 days ago
3-4337
3 days
29652 fmortimore
author:fmortimore
feat(Order): the Bourbaki–Witt theorem We prove the Bourbaki-Witt theorem, one of Wiedijk's 1000+ theorems --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-order 228/0 Mathlib.lean,Mathlib/Order/BourbakiWitt.lean 2 5 ['eric-wieser', 'fmortimore', 'github-actions'] nobody
2-39797
2 days ago
2-79913
2 days ago
2-79949
2 days
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-ring-theory maintainer-merge RFC 2/1 Mathlib/Algebra/Order/Ring/Defs.lean 1 25 ['Vierkantor', 'YaelDillies', 'alreadydone', 'artie2000', 'erdOne', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] erdOne
assignee:erdOne
2-35431
2 days ago
2-37458
2 days ago
33-70806
33 days
29668 harahu
author:harahu
doc: cleanup of kleene star docs This PR: - Corrects "Kleene's star" to "Kleene star" - Clarifies a comment about notation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-computability 5/5 Mathlib/Computability/Language.lean 1 1 ['github-actions'] nobody
2-36399
2 days ago
2-36407
2 days ago
2-36444
2 days
29237 harahu
author:harahu
doc: capitalize archimedean Adjectives derived from people's last names are usually capitalized in English. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 337/336 Counterexamples/MapFloor.lean,Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/Archimedean/Hom.lean,Mathlib/Algebra/Order/Archimedean/Submonoid.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Order/Module/Archimedean.lean,Mathlib/Algebra/Order/Nonneg/Floor.lean,Mathlib/Algebra/Order/Ring/Archimedean.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/IsNonarchimedean.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Normed/Algebra/Ultra.lean,Mathlib/Analysis/Normed/Field/Ultra.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/Normed/Group/Ultra.lean,Mathlib/Analysis/Normed/Order/Hom/Basic.lean,Mathlib/Analysis/Normed/Order/Hom/Ultra.lean,Mathlib/Analysis/Normed/Ring/Ultra.lean,Mathlib/Analysis/Normed/Unbundled/FiniteExtension.lean,Mathlib/Analysis/Normed/Unbundled/InvariantExtension.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromBounded.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromConst.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deligne.lean,Mathlib/Data/Int/SuccPred.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/SuccPred.lean,Mathlib/Data/Real/Embedding.lean,Mathlib/GroupTheory/Archimedean.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/NumberTheory/FunctionField.lean,Mathlib/NumberTheory/LSeries/DirichletContinuation.lean,Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/NumberTheory/Padics/Complex.lean,Mathlib/NumberTheory/Padics/MahlerBasis.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean,Mathlib/NumberTheory/Padics/ValuativeRel.lean,Mathlib/Order/Filter/AtTopBot/Archimedean.lean,Mathlib/Order/Interval/Finset/Box.lean,Mathlib/Order/SuccPred/Archimedean.lean,Mathlib/Order/SuccPred/Basic.lean,Mathlib/Order/SuccPred/IntervalSucc.lean,Mathlib/Order/SuccPred/LinearLocallyFinite.lean,Mathlib/Order/SuccPred/Tree.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/HahnSeries/Lex.lean,Mathlib/RingTheory/Valuation/Archimedean.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/Nonarchimedean.lean,Mathlib/Topology/Algebra/Nonarchimedean/AdicTopology.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/Basic.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Algebra/Nonarchimedean/TotallyDisconnected.lean,Mathlib/Topology/Algebra/OpenSubgroup.lean,Mathlib/Topology/Algebra/Order/Archimedean.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/MetricSpace/Ultra/Basic.lean,Mathlib/Topology/MetricSpace/Ultra/Pi.lean,Mathlib/Topology/MetricSpace/Ultra/TotallySeparated.lean,Mathlib/Topology/UniformSpace/Ultra/Basic.lean,Mathlib/Topology/UniformSpace/Ultra/Completion.lean,Mathlib/Topology/UniformSpace/Ultra/Constructions.lean 74 5 ['euprunin', 'github-actions', 'mathlib4-merge-conflict-bot'] nobody
2-36305
2 days ago
2-36323
2 days ago
13-37472
13 days
28533 kim-em
author:kim-em
feat(linarith): add `linarith?` mode which suggests a `linarith only` call Adds `linarith?`, which traces the internal to watch which inequalities are being used, and suggests a `linarith only` call via the "try this:" mechanism. Also adds a `+minimize` flag, on by default, which then greedily tries to drop hypotheses from the used set, to see if the problem is still possible with a smaller set. Currently I don't have test case showing this is worthwhile, however. Contributions welcome. ------ https://chatgpt.com/codex/tasks/task_e_68a02bce93a883218485c7e7cafb877a codex t-meta 212/68 Mathlib/Tactic/Linarith/Frontend.lean,Mathlib/Tactic/Linarith/Verification.lean,MathlibTest/linarith.lean 3 12 ['YaelDillies', 'eric-wieser', 'github-actions', 'hrmacbeth', 'jcommelin', 'kim-em', 'mathlib4-merge-conflict-bot'] robertylewis
assignee:robertylewis
2-24713
2 days ago
15-60504
15 days ago
31-59867
31 days
29626 themathqueen
author:themathqueen
chore(Algebra/Order/Module/PositiveLinearMap): generalize `OrderHomClass.ofLinear` Generalize `OrderHomClass.ofLinear` from linear maps to additive group homomorphisms. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra easy
label:t-algebra$
10/11 Mathlib/Algebra/Order/Module/PositiveLinearMap.lean,Mathlib/Analysis/CStarAlgebra/CompletelyPositiveMap.lean 2 5 ['Ruben-VandeVelde', 'github-actions', 'themathqueen'] nobody
2-21129
2 days ago
2-21150
2 days ago
3-85907
3 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$
263/10 Mathlib.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/RingTheory/Coalgebra/Basic.lean,Mathlib/RingTheory/Coalgebra/Convolution.lean,Mathlib/RingTheory/Regular/RegularSequence.lean 7 86 ['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'kbuzzard', 'smorel394', 'themathqueen'] kbuzzard
assignee:kbuzzard
2-21059
2 days ago
20-36731
20 days ago
115-2783
115 days
26396 xroblot
author:xroblot
feat(RingTheory): define the dual of a basis for the trace and prove basic properties --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory 121/38 Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Trace/Basic.lean 3 3 ['github-actions', 'mathlib4-merge-conflict-bot'] adomani
assignee:adomani
2-20584
2 days ago
2-20608
2 days ago
82-74634
82 days
29411 llllvvuu
author:llllvvuu
feat(LinearAlgebra/Matrix/Rank): rank factorization The rank factorization derived from `Module.finBasis`. Co-authored-by: @Aristotle-Harmonic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
20/0 Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean 2 1 ['github-actions'] jcommelin
assignee:jcommelin
2-19056
2 days ago
9-80624
9 days ago
9-80622
9 days
29476 llllvvuu
author:llllvvuu
feat(LinearAlgebra/Matrix): `charpoly` splits into `IsHermitian.eigenvalues` Co-authored-by: @Aristotle-Harmonic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
52/12 Mathlib/LinearAlgebra/Matrix/HermitianFunctionalCalculus.lean,Mathlib/LinearAlgebra/Matrix/Spectrum.lean 2 7 ['github-actions', 'llllvvuu', 'mathlib4-merge-conflict-bot', 'themathqueen'] j-loreaux
assignee:j-loreaux
2-18948
2 days ago
6-66257
6 days ago
8-1259
8 days
29630 yury-harmonic
author:yury-harmonic
feat: prove Gauss-Lucas theorem The proof was found by Aristotle AI, then rewritten by me in Mathlib style. Co-authored-by: @Aristotle-Harmonic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 159/8 Mathlib.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Analysis/Complex/Polynomial/GaussLucas.lean,docs/1000.yaml 5 1 ['github-actions'] nobody
2-18117
2 days ago
3-47592
3 days ago
3-47573
3 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/) t-meta 300/29 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 5 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vasnesterov'] alexjbest
assignee:alexjbest
2-15374
2 days ago
2-15382
2 days ago
66-29690
66 days
26110 YaelDillies
author:YaelDillies
feat: sharp monoids Define sharp monoids, which are the monoids whose only unit is `1`. This concept is useful in log geometry and in particular shows up in the theory of affine monoids. This concept already existed in the guise of `Subsingleton Mˣ`, but giving it a name makes it easier to refer to and uncovers some missing instances. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-algebra
label:t-algebra$
51/30 Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Irreducible/Defs.lean,Mathlib/Algebra/Group/Pi/Units.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Submonoid/Units.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Associated.lean,Mathlib/Algebra/GroupWithZero/Divisibility.lean,Mathlib/Data/List/Prime.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/NumberTheory/DirichletCharacter/Basic.lean,Mathlib/RingTheory/ChainOfDivisors.lean,Mathlib/RingTheory/IntegralDomain.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean,Mathlib/RingTheory/Valuation/Integers.lean 18 7 ['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'vihdzp'] adomani
assignee:adomani
2-14524
2 days ago
6-8955
6 days ago
90-9002
90 days
29679 Jlh18
author:Jlh18
fix: attributes to_app and reassoc In `../Pseudofunctor`, - the parallel attributes `@[reassoc, to_app]` fail to generate the useful lemmas `..._app_assoc`. These have been replaced with the attribute `@[to_app (attr:=reassoc)]` - there were several usages of `@[reassoc]` on lemmas `f = ...` where `f` is not a composition. This generates a useless lemma. These have been removed. In `../NaturalTransformation/Pseudo`, - there are again some usages of `@[reassoc]` on lemmas `f = ...` where `f` is not a composition. These have been removed. - there was no `@[to_app]` on `naturality_comp_inv`, but there was for `naturality_comp_hom`, so I added it. Related zulip posts: [#mathlib4 > reassoc and simp](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/reassoc.20and.20simp/with/449403172) By the way, for `../NaturalTransformation/Pseudo`, - I'm also not sure whether ```lean4 @[reassoc (attr := simp), to_app] theorem whiskerLeft_naturality_naturality (f : a' ⟶ G.obj a) {g h : a ⟶ b} (β : g ⟶ h) : f ◁ G.map₂ β ▷ θ.app b ≫ f ◁ (θ.naturality h).hom = f ◁ (θ.naturality g).hom ≫ f ◁ θ.app a ◁ H.map₂ β := θ.toOplax.whiskerLeft_naturality_naturality _ _ ``` really is the behaviour that we want. I am not changing it because I am unsure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-category-theory 17/17 Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean 2 1 ['github-actions'] nobody
2-13154
2 days ago
2-13724
2 days ago
2-13765
2 days
21965 JovanGerb
author:JovanGerb
feat: extensible `push` and `pull` tactics This PR defines the `push` and `pull` tactics, and makes `push_neg` a macro for `push Not`. The tactics are also available in `conv` mode. For tagging, there is only the `@[push]` attribute, which adds the reverse rewrite for the `pull` tactic when relevant. In the future, we may also need a separate `@[pull X]` attribute for pulling `X`. Thanks to this change, we will be able to make `push_neg` into a more powerful tactic by tagging more lemmas. It also means that about 60 files now don't need to import `LinearOrder`/`PartialOrder`. This will be especially useful when we get the `@[to_dual]` attribute. This work originally started in #21769. There is now the follow up PR #29000 which adds `push` tags and tests for them. The `@[push]` attribute is defined in `Mathlib.Tactic.Push.Attr` and the main implementation of `push` and `pull` is in `Mathlib.Tactic.Push`. Some proofs need to be fixed because the new simp-based `push_neg` can see through more reducible definitions. Zulip conversation: [#mathlib4 > I made an extensible `push` tactic generalizing `push_neg`](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/I.20made.20an.20extensible.20.60push.60.20tactic.20generalizing.20.60push_neg.60) closes #21841 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-meta 505/178 Mathlib.lean,Mathlib/Algebra/Lie/Weights/Killing.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/RingTheory/AlgebraicIndependent/TranscendenceBasis.lean,Mathlib/RingTheory/HahnSeries/Lex.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Push.lean,Mathlib/Tactic/Push/Attr.lean,Mathlib/Topology/Algebra/IsUniformGroup/Basic.lean,MathlibTest/push.lean,MathlibTest/push_neg.lean,scripts/noshake.json 17 62 ['JovanGerb', 'adomani', 'github-actions', 'grunweg', 'j-loreaux', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'plp127'] robertylewis
assignee:robertylewis
2-13044
2 days ago
2-13065
2 days ago
141-6277
141 days
29344 JovanGerb
author:JovanGerb
feat(Geometry/Euclidean/Sphere/Power): use side condition `p ∈ line[ℝ, a, b]` This PR changes the side condition used in theorems about `Sphere.power` to be `p ∈ line[ℝ, a, b]`. This is symmetric in `a` and `b`, and more general than the current condition. TODO (in this PR?): add some basic lemmas about `p ∈ line[ℝ, a, b]`. TODO (in another PR): prove the power theorems about `Sphere.secondInter`, which is more general in the sense that it also includes the case where `a` and `b` coincide, and then `p` is on the tangent line. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-euclidean-geometry 31/34 Mathlib/Geometry/Euclidean/Sphere/Power.lean 1 4 ['github-actions', 'jsm28', 'mathlib4-merge-conflict-bot'] jsm28
assignee:jsm28
2-12597
2 days ago
2-67911
2 days ago
13-3284
13 days
29119 JovanGerb
author:JovanGerb
fix(Tactic/ToAdditive/Frontend): swap `reorderForall` and `applyReplacementForall` This PR does some general clean-up in the `to_additive` implementation: - `expand` is moved up so that it can be called directly inside of `applyReplacementFun`. The current situation requires uses of `applyReplacementFun` to know that they need to call `expand` first. - `applyReplacementFun` is significantly cleaned up, without changing the implementation, making it shorter, more readable and more efficient. - It swaps reorderForall/Lambda with applyReplacementForall/Lambda, because in the previous order, if `reorder` would reorder some argument that appears in `dontTranslate`, it would do the wrong thing (although I don't think this will ever come up in practice) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-meta 93/106 Mathlib/Tactic/ToAdditive/Frontend.lean,MathlibTest/toAdditive.lean 2 2 ['github-actions', 'mathlib4-merge-conflict-bot'] robertylewis
assignee:robertylewis
2-11682
2 days ago
2-11704
2 days ago
18-76083
18 days
29422 jsm28
author:jsm28
fix(Data/Finset/Max): Use `DecidableEq` for `insert` lemmas These `insert` in these lemma statements uses a `DecidableEq` instance derived from `LinearOrder`; make them syntactically more general by passing in a `DecidableEq` instance separately. (Some `insert` lemmas in this file already take `DecidableEq` hypotheses.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 8/8 Mathlib/Data/Finset/Max.lean 1 2 ['eric-wieser', 'github-actions'] nobody
2-10264
2 days ago
9-65942
9 days ago
9-65924
9 days
29624 mcdoll
author:mcdoll
feat(LinearAlgebra/LinearPMap): add definition of resolvent and first resolvent identity --- Still work in progress, but it compiles and feedback on naming and design is very welcome. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
180/2 Mathlib/LinearAlgebra/LinearPMap.lean 1 2 ['github-actions', 'mcdoll'] nobody
2-6306
2 days ago
2-6306
2 days ago
2-6288
2 days
25831 ScottCarnahan
author:ScottCarnahan
feat (RingTheory/HahnSeries): Powers of a binomial This PR introduces powers of a binomial `single g 1 - single g' 1` in a Hahn series, where the powers take values in a binomial ring. These series behave as one would expect with respect to addition of powers, and comparison with natural number powers. They are often used in the theory of vertex algebras. --- - [x] depends on: #25830 - [x] depends on: #27497 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *This PR continues the work from #24102.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24102* t-ring-theory 127/0 Mathlib.lean,Mathlib/RingTheory/HahnSeries/Binomial.lean,Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean 4 12 ['ScottCarnahan', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] kbuzzard
assignee:kbuzzard
2-3335
2 days ago
33-77442
1 month ago
33-78902
33 days
29684 grunweg
author:grunweg
chore: golf using subset_rfl Instead of subset_refl _. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) easy 11/14 Mathlib/Analysis/LocallyConvex/BalancedCoreHull.lean,Mathlib/Data/Fintype/EquivFin.lean,Mathlib/LinearAlgebra/Eigenspace/Triangularizable.lean,Mathlib/MeasureTheory/OuterMeasure/OfFunction.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/NoetherianSpace.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean 8 1 ['github-actions'] nobody
2-2218
2 days ago
2-2347
2 days ago
2-2329
2 days
28702 Timeroot
author:Timeroot
feat(Algebra/Group/Hom/Defs): MonoidHom switching from MulOneClass to MulOne Currently `MonoidHom` relies on a `MulOneClass`, stating that 1 is a multiplicative identity; when actually all a "monoid" hom does is preserve multiplication and one. So, really, a MonoidHom is a "mul-and-one hom", but one cannot use it with any type that isn't a MulOneClass. (It also does not enforce being a Monoid: associativity is not required.) In general, homs like this should only rely on the data being present in the source and destination type; any applications of it are then free to assume MulOneClass or Monoid where appropriate, which is essentially already how it does. This drops the MulOneClass assumption so that MonoidHom just takes the Mul and One types. _But_ if we wrote `MonoidHom [Mul M] [One M]`, this would essentially double the effort needed for typeclass inference. An experiment in #28889 confirmed this performance hit. So, we define a `MulOne` type which is just the `Mul` and `One` data bundled together, and the performance change becomes pretty minimal. And then there are the corresponding changes to `AddMonoidHom` / `AddZeroClass` becoming `AddZero`. This follows some discussion at [#mathlib4 > RingHom for not-a-ring](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/RingHom.20for.20not-a-ring) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
78/68 Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean 7 12 ['JovanGerb', 'Timeroot', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot'] dagurtomas
assignee:dagurtomas
2-763
2 days ago
2-763
2 days ago
28-7006
28 days
26871 grunweg
author:grunweg
feat: finite sum, difference, scalar product of differentiable sections is differentiable This mirrors the additions of #26674 to `mdifferentiable` sections. Part of the path towards geodesics and the Levi-Civita connection. Co-authored-by: Patrick Massot --- - [x] depends on: #26870 (and perhaps more/need to split afterwards) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-differential-geometry 179/3 Mathlib/Geometry/Manifold/VectorBundle/MDifferentiable.lean 1 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] nobody
1-83882
1 day ago
1-84426
1 day ago
1-85463
1 day
29688 tb65536
author:tb65536
feat(FieldTheory/IsGaloisGroup): prove the Galois correspondence for `IsGaloisGroup` This PR reproves the Galois correspondence for `IsGaloisGroup`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
89/0 Mathlib/FieldTheory/Galois/IsGaloisGroup.lean 1 1 ['github-actions'] nobody
1-82703
1 day ago
1-82703
1 day ago
1-82685
1 day
29690 jt496
author:jt496
chore(SimpleGraph/Subgraph): remove duplicate def and fix names We previously had `Subgraph.topEquiv` and `Subgraph.topIso` for the graph isomorphism `(⊤ : G.Subgraph).coe ≃g G`. `Subgraph.topIso` seems preferable as a name for this so this PR deprecates the other name. Also rename and deprecate `Subgraph.botEquiv` to `Subgraph.botIso`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 5/6 Mathlib/Combinatorics/SimpleGraph/Subgraph.lean 1 1 ['github-actions'] nobody
1-82254
1 day ago
1-82269
1 day ago
1-82310
1 day
29395 YaelDillies
author:YaelDillies
refactor: make `PosMulMono` and alike custom classes In the current setup, users get confusing non-beta-reduced goals involving a subtype when trying to provide an instance of `PosMulMono`. This PR changes it to be a custom structure with the expected fields. This follows `PosSMulMono` and alike. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order t-algebra
label:t-algebra$
188/267 Counterexamples/CanonicallyOrderedCommSemiringTwoMul.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Defs.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/InjSurj.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Algebra/Order/Ring/Opposite.lean,Mathlib/Algebra/Order/Ring/Prod.lean,Mathlib/Algebra/Order/Ring/Star.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Order/Filter/FilterProduct.lean,Mathlib/Order/Filter/Ring.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/NaturalOps.lean,MathlibTest/GRewrite.lean 22 3 ['github-actions', 'mathlib4-merge-conflict-bot'] nobody
1-81165
1 day ago
1-81189
1 day ago
5-74195
5 days
27841 CBirkbeck
author:CBirkbeck
feat(Topology/Algebra/InfiniteSum/NatInt): add more pnat tsum lemmas --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 32/7 Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean 3 8 ['CBirkbeck', 'github-actions', 'loefflerd'] ADedecker
assignee:ADedecker
1-67998
1 day ago
9-6046
9 days ago
9-7324
9 days
29373 staroperator
author:staroperator
doc(ModelTheory): clarify free and (in-scope) bound variables in `BoundedFormula` The current design of `BoundedFormula` is actually a locally nameless representation. Following PL convention, we should call the `α` indexed variables as free variables, and the `Fin n` indexed variables as (in-scope) bound variables. Also clarify that the bound variables are actually de Bruijn levels. Some references: - - [Locally nameless in CSLib](https://github.com/leanprover/cslib/blob/4734d98a80d82e8bb15cbb64b6cfaa30c08691a8/Cslib/Languages/LambdaCalculus/LocallyNameless/Untyped/Basic.lean) - [Locally nameless in Lean core](https://github.com/leanprover/lean4/blob/540e9e85f3317d04133aa2a69d5a24fb31e92d8b/src/Lean/Expr.lean#L238) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-logic documentation 32/31 Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean 2 2 ['github-actions', 'mathlib4-merge-conflict-bot'] fpvandoorn
assignee:fpvandoorn
1-67994
1 day ago
9-23335
9 days ago
11-62327
11 days
29420 llllvvuu
author:llllvvuu
chore: golf `LinearMap.charpoly_toMatrix` and add corollaries --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
31/39 Mathlib/LinearAlgebra/Charpoly/ToMatrix.lean 1 1 ['github-actions', 'kckennylau'] joelriou
assignee:joelriou
1-67993
1 day ago
9-66258
9 days ago
9-66305
9 days
29439 themathqueen
author:themathqueen
feat(Analysis/InnerProductSpace/Projection/Basic): `e ∘ f = 0` iff `(ker e).starProjection ∘ f = f` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 13/0 Mathlib/Analysis/InnerProductSpace/Projection/Basic.lean 1 1 ['github-actions'] j-loreaux
assignee:j-loreaux
1-67991
1 day ago
9-14857
9 days ago
9-14897
9 days
28884 kim-em
author:kim-em
chore: deprecate ShiftLeft Int instance This PR proposes deprecating the `ShiftLeft Int` instance (which allows bit-shifting an integer by an integer), and similarly for `ShiftRight`. These are unused in Mathlib. I'm happy if someone wants to keep this, but I would ask that they: * fix the doc-strings to explain what happens for negative shifts * ~~restores the theorem `Int.shiftLeft_add` which I've commented out on `nightly-testing` (and then revert b33c9d7aaea on `nightly-testing`).~~ * ideally but optionally, complete the API, e.g. reducing shifts by casts back to shifts by a Nat t-data 22/3 Mathlib/Data/Int/Bitwise.lean 1 5 ['eric-wieser', 'github-actions', 'kim-em', 'mathlib4-merge-conflict-bot'] nobody
1-67983
1 day ago
1-68001
1 day ago
23-36103
23 days
29486 kim-em
author:kim-em
chore: scope an expensive `IsDomain`->`IsAddTorsionFree` instance Unfortunately this instance significantly affects (10%) the run time of ``` import Mathlib variable {K : Type*} [Field K] example : Lean.Grind.NoNatZeroDivisors K := inferInstance ``` which is on the critical path for `grind`. It seems okay to scope it? It is only used once, in a file with explicit `IsDomain` variables. t-algebra
label:t-algebra$
11/2 Mathlib/Algebra/Ring/Torsion.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Lemmas.lean,MathlibTest/slow_instances.lean 3 5 ['github-actions', 'kbuzzard', 'leanprover-bot', 'mathlib4-merge-conflict-bot'] nobody
1-67755
1 day ago
1-67787
1 day ago
7-35295
7 days
29547 kim-em
author:kim-em
chore: remove defunct polyrith tactic In my understanding, the public Sage server that `polyrith` relies on is down and never going to come back, and hence the `polyrith` code is dead. There are a bunch of viable options for restoring this, e.g. running Sage locally, running our own Sage server, moving to a different external CAS, implementing Grobner bases in a way that produces nullstellensatz certificates (including by modifying the `grind` implementation). But none of these exist at the moment, so this code in Mathlib is not of any use. It can immediately be restored from history if someone wants to implement one of these solutions. In the meantime, one can also use `grobner` (which calls the Grobner module in `grind`) to close the goal without a source code certificate. file-removed 16/1241 Archive/Imo/Imo1962Q4.lean,Archive/Imo/Imo2006Q3.lean,Mathlib/Algebra/Star/CHSH.lean,Mathlib/Tactic/Polyrith.lean,MathlibTest/polyrith.lean,scripts/README.md,scripts/noshake.json,scripts/polyrith_sage_helper.py 8 3 ['euprunin', 'github-actions', 'kim-em', 'mathlib4-merge-conflict-bot'] nobody
1-67585
1 day ago
1-67612
1 day ago
6-5039
6 days
29573 kim-em
author:kim-em
chore: deprecate `Traversable` deriving handler This broke on `nightly-testing`. It's very probably fixable, but I'm not interested in doing that myself, and I think this is a good opportunity to remove some code which has not been used since 2018. file-removed 7/3 Mathlib.lean,Mathlib/Deprecated/Tactic/DeriveTraversable.lean,Mathlib/Tactic.lean,MathlibTest/Traversable.lean 4 2 ['github-actions', 'mathlib4-merge-conflict-bot'] nobody
1-67546
1 day ago
1-67564
1 day ago
5-38103
5 days
29492 kim-em
author:kim-em
feat: grind golf in Mathlib.Data.List Much of this comes from locations identified by the new `linter.tacticAnalysis.terminalToGrind`, and then cleaning up in flagged files. t-data 73/211 Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Flatten.lean,Mathlib/Data/List/Induction.lean,Mathlib/Data/List/Lattice.lean,Mathlib/Data/List/Lookmap.lean,Mathlib/Data/List/ReduceOption.lean,Mathlib/Data/List/SplitOn.lean,Mathlib/Data/List/TakeDrop.lean,Mathlib/Data/List/Triplewise.lean,Mathlib/Data/Multiset/UnionInter.lean 10 6 ['eric-wieser', 'euprunin', 'github-actions', 'kim-em', 'mathlib4-merge-conflict-bot'] nobody
1-60229
1 day ago
1-67676
1 day ago
7-17481
7 days
27982 ShreckYe
author:ShreckYe
chore(Data/Nat/GCD): use `Nat.Prime.dvd_or_dvd` from #27981 in `Nat.Prime.dvd_or_dvd_of_dvd_lcm` from #27963 to simplify the proof a bit - [ ] depends on: #27963 - [ ] depends on: #27981 new-contributor 1/1 Mathlib/Data/Nat/GCD/Prime.lean 1 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] nobody
1-59056
1 day ago
1-59063
1 day ago
1-69837
1 day
29697 kim-em
author:kim-em
chore: run 'lake build AesopTest' on nightlies This would have prevented an annoying hurdle during the last release cycle. CI 24/0 .github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml 4 1 ['github-actions'] nobody
1-55745
1 day ago
1-55932
1 day ago
1-55971
1 day
28973 YaelDillies
author:YaelDillies
feat(TensorProduct): `lTensor` as an `AlgHom` and other lemmas From Toric Co-authored-by: Michał Mrugała --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory toric 21/0 Mathlib/RingTheory/TensorProduct/Basic.lean 1 7 ['YaelDillies', 'eric-wieser', 'github-actions', 'themathqueen'] mattrobball
assignee:mattrobball
1-49361
1 day ago
1-68959
1 day ago
20-32669
20 days
27887 JovanGerb
author:JovanGerb
feat: `to_dual` attribute This PR defines the `to_dual` attribute for translating lemmas to their dual. This is useful in order theory and in category theory. It is built on top of the `to_additive` machinery. This PR only adds `@[to_dual]` tags in files that directly need to import `ToDual`, namely `Order/Defs/PartialOrder`, `Order/Notation` and `Combinatorics/Quiver/Basic`. Further tagging is left for (many) future PRs. This PR continues the work from #21719 This PR depends on/supersedes #27894 Related (mathlib3) issues: - https://github.com/leanprover-community/mathlib3/issues/13461 - https://github.com/leanprover-community/mathlib3/issues/7691 Co-authored-by: @bryangingechen --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-meta 616/293 Mathlib.lean,Mathlib/Combinatorics/Quiver/Basic.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Defs/PartialOrder.lean,Mathlib/Order/Notation.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,Mathlib/Tactic/ToAdditive/GuessName.lean,Mathlib/Tactic/ToAdditive/ToDual.lean,Mathlib/Tactic/ToDual.lean,MathlibTest/toAdditive.lean,scripts/noshake.json 15 12 ['JovanGerb', 'bryangingechen', 'github-actions', 'mathlib4-merge-conflict-bot'] nobody
1-44630
1 day ago
2-10936
2 days ago
19-29783
19 days
29674 xroblot
author:xroblot
feat(PowerBasis): various ways to create power bases Add the two following results: - If `x` generates `S` over `R` and is integral over `R`, then it defines a power basis over `R` (also version over a field), - Construct a power basis from a basis consisting of powers of an element. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
45/0 Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean,Mathlib/RingTheory/Adjoin/PowerBasis.lean,Mathlib/RingTheory/PowerBasis.lean 3 1 ['github-actions'] nobody
1-43982
1 day ago
1-43982
1 day ago
2-22314
2 days
29665 xroblot
author:xroblot
feat(IsCyclotomicExtension): some results for the sub-algebra case We add some results about cyclotomic extensions which are also contained in an extension `A ⊆ B` of rings. In this case, the cyclotomic extension `IsCyclotomicExtension S A C` is determined by `S` and thus we can prove various statements such as the fact that the compositum of `A[ζₙ]` and `A[ζₘ]` is `A[ζₗ]` where `l` is the lcm of `n` and `m`. --- - [x] depends on: #29600 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
114/0 Mathlib/NumberTheory/Cyclotomic/Basic.lean 1 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] nobody
1-42359
1 day ago
1-42383
1 day ago
1-69905
1 day
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 156/99 Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,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 18 28 ['JovanGerb', 'YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'urkud'] Vierkantor
assignee:Vierkantor
1-42094
1 day ago
1-82821
1 day ago
172-54028
172 days
29704 RemyDegenne
author:RemyDegenne
Refactor(Probability/Kernel): build `compProd` from `comp` and `parallelComp` This PR changes the definitions of `Kernel.compProd` and `Kernel.prod`. - Before this PR, we had 3 types of compositions of kernels that were built "from scratch": `comp`, `parallelComp` and `compProd`. And then `prod` was defined using `compProd`. - After this PR, only `comp` and `parallelComp` are basic blocks of the compositions/products of kernels: `compProd` and `prod` are built from those (and from particular deterministic kernels). The auxiliary definition `compProdFun` that was used only to build `compProd` is deleted. I had to move several lemmas around to reflect changes in the import structure in the folder. The PR summary bot comment shows that nothing was lost besides results about `compProdFun`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-measure-probability 220/286 Mathlib.lean,Mathlib/Probability/Kernel/Composition/CompProd.lean,Mathlib/Probability/Kernel/Composition/KernelLemmas.lean,Mathlib/Probability/Kernel/Composition/Lemmas.lean,Mathlib/Probability/Kernel/Composition/MeasureComp.lean,Mathlib/Probability/Kernel/Composition/Prod.lean 6 1 ['github-actions'] nobody
1-41745
1 day ago
1-41807
1 day ago
1-41852
1 day
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 391/68 Mathlib.lean,Mathlib/CategoryTheory/Closed/PowerObjects.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Equalizer.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Topos/Classifier.lean 9 13 ['fweth', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot'] riccardobrasca
assignee:riccardobrasca
1-40510
1 day ago
10-18763
10 days ago
29-77329
29 days
29341 joelriou
author:joelriou
feat(Topology): the topology generated by a family of spaces Some categories of topological spaces are "convenient" in the sense that they have nice categorical properties (e.g. they have limits, colimits and are cartesian closed). This PR is the first in a series towards showing that delta generated spaces form a cartesian closed monoidal category (see https://github.com/joelriou/topcat-model-category/blob/852a514c1d955ab586507bcd5a7b5efb99c6c3df/TopCatModelCategory/Convenient/CartesianClosed.lean#L92 for the general result), and this result is part of my formalization effort towards the Quillen model category structure on simplicial sets. In this PR, given a family `X` of topological spaces, and a topological space `Y`, we introduce the `X`-generated topology on `Y`, which is coinduced by all continuous maps `X i → Y`. (Eventually, this will generalize previous works by Dagur Asgeirsson and Ben Eltschig about compactly/delta generated spaces in mathlib. At some point, their definitions will be refactored as particular cases of the definitions in this PR series.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-topology 243/0 Mathlib.lean,Mathlib/Topology/Convenient/GeneratedBy.lean,docs/references.bib 3 3 ['github-actions', 'joelriou'] jcommelin
assignee:jcommelin
1-36024
1 day ago
13-37238
13 days ago
13-37219
13 days
29526 llllvvuu
author:llllvvuu
feat: `Multiset.map f` identifies `f` up to permutation Example use case: Reason about `Matrix.IsHermitian.eigenvalues`, which is `Fintype`-indexed, via `Matrix.charpoly.roots` which is a `Multiset`. May also apply to #29610 Co-authored-by: @Aristotle-Harmonic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data 29/0 Mathlib/Data/Multiset/Fintype.lean 1 6 ['github-actions', 'llllvvuu', 'vihdzp', 'wwylele'] nobody
1-35861
1 day ago
6-66394
6 days ago
6-66392
6 days
29110 NotWearingPants
author:NotWearingPants
feat(Counterexamples): Euler's sum of powers conjecture feat(Counterexamples): Euler's sum of powers conjecture --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 158/0 Counterexamples.lean,Counterexamples/EulerSumOfPowers.lean 2 40 ['MichaelStollBayreuth', 'NotWearingPants', 'eric-wieser', 'github-actions', 'tb65536'] MichaelStollBayreuth
assignee:MichaelStollBayreuth
1-34379
1 day ago
1-72755
1 day ago
15-25624
15 days
29418 jsm28
author:jsm28
feat(Analysis/Convex/Between): interior of a 1-simplex Add lemmas relating the `interior` or `closedInterior` of a 1-simplex to betweenness. --- - [ ] depends on: #29415 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-convex-geometry 93/0 Mathlib/Analysis/Convex/Between.lean 1 8 ['eric-wieser', 'github-actions', 'jsm28', 'mathlib4-dependent-issues-bot'] nobody
1-33909
1 day ago
2-9155
2 days ago
2-9464
2 days
28669 kckennylau
author:kckennylau
chore: clean up some proofs about locally compact valuation --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory 26/24 Mathlib/RingTheory/Valuation/Archimedean.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean 3 5 ['github-actions', 'grunweg', 'kckennylau', 'pechersky'] nobody
1-28395
1 day ago
1-28395
1 day ago
10-52203
10 days
29354 themathqueen
author:themathqueen
refactor(Algebra/Algebra/Equiv): allow for non-unital `AlgEquiv` This refactors `AlgEquiv` to allow for non-unital algebras. More specifically, we weaken the type class assumptions from: ```lean structure AlgEquiv (R A B : Type*) [CommSemiring R] [Semiring A] [Semiring B] [Algebra R A] [Algebra R B] ``` to ```lean structure AlgEquiv (R A B : Type*) [Add A] [Add B] [Mul A] [Mul B] [SMul R A] [SMul R B] ``` Instead of a `commutes'` field, we now have a `map_smul'` field. We also include a definition `AlgEquiv.ofCommutes` which takes in a `RingEquiv` and a `commutes'` field to match before and for convenience. `StarAlgEquiv` now extends `AlgEquiv`. We also generalize a few files to allow for non-unital. I suspect there are a few more things to generalize, but will leave this for later. Co-authored-by: Jireh Loreaux --- Revives #8686. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
525/482 Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/MulOpposite.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/CommAlgCat/Basic.lean,Mathlib/Algebra/Category/CommAlgCat/FiniteType.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/DualQuaternion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Rename.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Taylor.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Star/Free.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/UnitizationL1.lean,Mathlib/Analysis/Normed/Lp/LpEquiv.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/Data/Matrix/Composition.lean,Mathlib/Data/Matrix/DualNumber.lean,Mathlib/FieldTheory/Fixed.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/FieldTheory/Normal/Basic.lean,Mathlib/FieldTheory/PrimitiveElement.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/LinearAlgebra/CliffordAlgebra/BaseChange.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Conjugation.lean,Mathlib/LinearAlgebra/Complex/Module.lean,Mathlib/LinearAlgebra/Matrix/Basis.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/LinearMap.lean,Mathlib/LinearAlgebra/Matrix/Reindex.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Matrix/Unique.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean,Mathlib/LinearAlgebra/TensorProduct/Subalgebra.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Etale/Field.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Flat/Equalizer.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/Frobenius.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/IntegralClosure/IntegrallyClosed.lean,Mathlib/RingTheory/Invariant/Basic.lean,Mathlib/RingTheory/Invariant/Profinite.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Jacobson/Artinian.lean,Mathlib/RingTheory/Jacobson/Ring.lean,Mathlib/RingTheory/Kaehler/Basic.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/MatrixAlgebra.lean,Mathlib/RingTheory/MvPolynomial/Localization.lean,Mathlib/RingTheory/Norm/Basic.lean,Mathlib/RingTheory/Polynomial/Quotient.lean,Mathlib/RingTheory/PolynomialAlgebra.lean,Mathlib/RingTheory/PowerSeries/WeierstrassPreparation.lean,Mathlib/RingTheory/RingHom/FiniteType.lean,Mathlib/RingTheory/SimpleModule/Isotypic.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/Pi.lean,Mathlib/RingTheory/Spectrum/Prime/Polynomial.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/RingTheory/TensorProduct/Pi.lean,Mathlib/RingTheory/TensorProduct/Quotient.lean,Mathlib/RingTheory/Trace/Basic.lean,Mathlib/RingTheory/Unramified/Field.lean,Mathlib/Topology/Algebra/Algebra/Equiv.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/LocallyConstant/Algebra.lean 93 23 ['fpvandoorn', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot', 'themathqueen'] nobody
1-25188
1 day ago
3-16730
3 days ago
4-74621
4 days
24754 urkud
author:urkud
feat: define `pathIntegral` This is a step towards formalizing of the Poincaré lemma for 1-forms. --- - [x] depends on: #24831 - [x] depends on: #25047 - [x] depends on: #25048 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 553/9 Mathlib.lean,Mathlib/Analysis/Convex/PathConnected.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/ContDiff.lean,Mathlib/MeasureTheory/Integral/PathIntegral/Basic.lean 6 26 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel', 'urkud'] nobody
1-23912
1 day ago
1-23919
1 day ago
9-76511
9 days
29706 kim-em
author:kim-em
feat: add piCongrSigmaFiber and piCongrFiberwise equivalences ## Summary Add two new equivalence functions for working with fibers and sigma types: - `Equiv.piCongrSigmaFiber`: transforms between functions on sigma fibers and regular pi types - `Equiv.piCongrFiberwise`: lifts fiber-wise equivalences to product equivalences These functions are from the FLT (Fermat's Last Theorem) project and are useful for manipulating dependent function types indexed by fibers of a function. ## Details The new definitions allow for elegant transformations between: 1. Functions defined on sigma types representing fibers of a function 2. Regular dependent functions These are particularly useful in algebraic contexts where one needs to work with products indexed by fibers. ## Context This PR was prepared by Claude (Claude Code) based on the following prompt: > "Please read FLT/Mathlib/Logic/Equiv/Basic.lean, and also the corresponding file in the Mathlib repository. Please prepare a PR to Mathlib containing this content, putting it at an appropriate point in the corresponding Mathlib file. Make sure the PR is label FLT, and write in the PR comment an explanation that the PR was prepared by Claude, including quoting the prompting." The content is sourced from `/Users/kim/projects/lean/FLT/FLT/Mathlib/Logic/Equiv/Basic.lean` in the FLT project repository. 🤖 Generated with [Claude Code](https://claude.ai/code) FLT t-logic 39/0 Mathlib/Logic/Equiv/Basic.lean 1 5 ['Ruben-VandeVelde', 'github-actions', 'kim-em'] nobody
1-22844
1 day ago
1-23322
1 day ago
1-39534
1 day
29693 kckennylau
author:kckennylau
feat(RingTheory): make Euclidean domain from DVR --- Zulip: https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Leading.20term.20of.20valuation/near/539666529 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory maintainer-merge 82/0 Mathlib/RingTheory/DiscreteValuationRing/Basic.lean 1 6 ['github-actions', 'kckennylau', 'pechersky'] nobody
1-21543
1 day ago
1-22195
1 day ago
1-68101
1 day
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. Co-authored-by: @Aristotle-Harmonic --- [![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'] loefflerd
assignee:loefflerd
1-17432
1 day ago
85-2612
2 months ago
85-2655
85 days
29715 ADedecker
author:ADedecker
feat: generalize `IsClosed.vadd_right_of_isCompact` to proper actions I realized a few weeks after adding them to Mathlib that the more conceptual approach for lemmas of the form "`s • t` is closed when one of `s` and `t` is closed and the other is compact" is that of proper maps and proper actions. This PR switches to this approach. More precisely: - I refactored the proof [IsClosed.smul_left_of_isCompact](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Algebra/Group/Pointwise.html#IsClosed.smul_left_of_isCompact) in terms of properness. The proof is essentially the same length, but conceptually simpler. - More importantly, I generalize [IsClosed.vadd_right_of_isCompact](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Algebra/Group/AddTorsor.html#IsClosed.vadd_right_of_isCompact) from topological torsors to proper actions. Note that I do not assume separation, which creates some troubles as compact sets are not closed... - To support the above, I introduce a bit more API on proper maps - I also moved `isProperMap_iff_isClosedMap_filter` to `Topology/Maps/Proper/UniversallyClosed`, together with the ultrafilter analog. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-topology 196/93 Mathlib/Topology/Algebra/Group/AddTorsor.lean,Mathlib/Topology/Algebra/Group/Pointwise.lean,Mathlib/Topology/Algebra/ProperAction/Basic.lean,Mathlib/Topology/Algebra/ProperAction/ProperlyDiscontinuous.lean,Mathlib/Topology/LocalAtTarget.lean,Mathlib/Topology/Maps/Proper/Basic.lean,Mathlib/Topology/Maps/Proper/UniversallyClosed.lean 7 2 ['ADedecker', 'github-actions'] nobody
1-17177
1 day ago
1-27602
1 day ago
1-27645
1 day
27215 kckennylau
author:kckennylau
feat(AlgebraicGeometry): Define the Zariski site on `CommRingCatᵒᵖ` We define the Zariski site on `CommRingCatᵒᵖ` by inducing the topology from `Scheme`, and then we show that this topology is equal to the one generated by the pretopology of finite, surjective, and standard open morphisms. --- - [x] depends on: #28614 - [x] depends on: #28615 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebraic-geometry 312/0 Mathlib.lean,Mathlib/AlgebraicGeometry/Sites/BigAffineZariski.lean 2 18 ['chrisflav', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] chrisflav
assignee:chrisflav
1-16650
1 day ago
1-16726
1 day ago
1-60674
1 day
29640 loefflerd
author:loefflerd
feat(NumberTheory/ModularForms): integrand for Petersson product Define integrand in Petersson product pairing of modular forms, & show its invariance property --- (Later PR's will show that if one of `f, f'` is a cusp form then this function has rapid decay & hence it is integrable, so we can define the Petersson scalar product.) Carved off from the WIP PR #25930 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-number-theory 91/0 Mathlib.lean,Mathlib/Analysis/Complex/UpperHalfPlane/MoebiusAction.lean,Mathlib/NumberTheory/ModularForms/Petersson.lean 3 1 ['github-actions'] nobody
1-13686
1 day ago
3-25842
3 days ago
3-26246
3 days
29154 ScottCarnahan
author:ScottCarnahan
feat (Algebra/Lie): Define low-degree cochains and differentials for coefficients with trivial action This PR defines 1-cochains and 2-cochains of a Lie algebra `L` with coefficients in a module `M` on which `L` acts trivially. This special case is useful for constructing central extensions of Lie algebras, while not needing the general machinery of Lie algebra cohomology. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
143/0 Mathlib.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/CochainTrivial.lean 3 1 ['github-actions'] mariainesdff
assignee:mariainesdff
1-8036
1 day ago
17-51918
17 days ago
17-51954
17 days
29248 mans0954
author:mans0954
feature(Analysis/Convex/Basic): Convexity and the algebra map Let `R` and `A` be ordered rings, `A` an `R`-algebra and `R`, `A`, `M` a scalar tower. We provide sufficient conditions for an `R`-convex subset of `M` to be `A`-convex and for an `A`-convex subset of `M` to be `R`-convex. These are used to show that, when `K` is `RCLike` and `ℝ` `K` `E` is a scalar tower, a set is `K`-convex if and only if it is `ℝ`-convex. Used in #29258 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 49/0 Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/RCLike/Lemmas.lean 2 4 ['github-actions', 'mans0954'] j-loreaux
assignee:j-loreaux
1-7568
1 day ago
15-9934
15 days ago
15-9924
15 days
29700 kim-em
author:kim-em
feat: miscellaneous grind golfs --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 17/58 Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Combinatorics/Matroid/Map.lean,Mathlib/Data/Int/Init.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Digits/Lemmas.lean,Mathlib/Data/Nat/Size.lean,Mathlib/Data/PEquiv.lean,Mathlib/MeasureTheory/Constructions/Cylinders.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/Order/WellFoundedSet.lean 11 1 ['euprunin', 'github-actions'] nobody
1-5461
1 day ago
1-51102
1 day ago
1-51083
1 day
29478 llllvvuu
author:llllvvuu
feat(LinearAlgebra): roots of charpoly are the eigenvalues/spectrum Co-authored-by: @Aristotle-Harmonic --- - [ ] depends on: #29428 for the lemma `LinearMap.charpoly_sub_smul` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-algebra
label:t-algebra$
134/27 Mathlib.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Eigenspace/Charpoly.lean,Mathlib/LinearAlgebra/Eigenspace/Matrix.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Eigs.lean 6 14 ['github-actions', 'llllvvuu', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen'] nobody
1-5246
1 day ago
1-17408
1 day ago
5-837
5 days
29604 mans0954
author:mans0954
refactor(Analysis/LocallyConvex/WithSeminorms): Relax some of the hypothesis Relax some of the hypothesis in `Analysis/LocallyConvex/WithSeminorms` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 21/19 Mathlib/Analysis/LocallyConvex/WithSeminorms.lean 1 3 ['ADedecker', 'github-actions', 'mans0954'] nobody
1-4567
1 day ago
5-1000
5 days ago
5-1038
5 days
29725 kebekus
author:kebekus
feat: representation of log⁺ as a circle average If `a` is any complex number, show that the circle average of `log ‖· - a‖` over the unit circle equals the positive part of the logarithm, `log⁺ ‖a‖`. This material is used in [Project VD](https://github.com/kebekus/ProjectVD), which aims to formalize Value Distribution Theory for meromorphic functions on the complex plane. The formula established here is a key ingredient in Jensen's formula of complex analysis. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-analysis 159/18 Mathlib/Analysis/SpecialFunctions/Integrals/PosLogEqCircleAverage.lean 1 1 ['github-actions'] nobody
1-3758
1 day ago
1-9827
1 day ago
1-9869
1 day
29723 Ruben-VandeVelde
author:Ruben-VandeVelde
feat: add TensorProduct.piScalarRight_symm_algebraMap --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) FLT t-algebra
label:t-algebra$
5/0 Mathlib/LinearAlgebra/TensorProduct/Pi.lean 1 3 ['Ruben-VandeVelde', 'github-actions', 'themathqueen'] nobody
1-3557
1 day ago
1-15479
1 day ago
1-15518
1 day
29511 luigi-massacci
author:luigi-massacci
feat: integrating wrt a finite measure as a continuous linear map on bounded continuous functions Add a definition `integralFiniteMeasure` of type `ContinuousLinearMap` packaging the integral of a bounded continuous function by a finite measure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-measure-probability 17/0 Mathlib/MeasureTheory/Integral/BoundedContinuousFunction.lean 1 26 ['github-actions', 'grunweg', 'luigi-massacci', 'ocfnash'] nobody
1-2307
1 day ago
7-5316
7 days ago
7-7461
7 days
29729 Ruben-VandeVelde
author:Ruben-VandeVelde
feat: Ideal.sum_ramification_inertia_of_isLocalRing --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) FLT t-number-theory 21/0 Mathlib/NumberTheory/RamificationInertia/Basic.lean 1 1 ['github-actions'] nobody
0-84171
23 hours ago
0-84213
23 hours ago
0-84256
23 hours
28967 utkuokur
author:utkuokur
refactor(Combinatorics/SimpleGraph/Walk): simplify proof of "support_tail_of_not_nil" The proof of the lemma named "support_tail_of_not_nil" is shortened. Since "support_tail" is not needed anymore, it is removed. @[deprecated (since := "2025-08-26")] sign is added for the removed "support_tail". The library references to "support_tail" are replaced with "support_tail_of_not_nil". To keep [@simp] on "cons_support_tail" and avoid the linter error, the [@simp] of "support_tail_of_not_nil" (previously on "support_tail") is removed. There might be a better way that I am missing, to deal with the linter error. --- Additionally, a merge conflict with `master` was resolved by keeping the generalized `support_tail_of_not_nil` and reintroducing `support_tail` as a deprecated alias for compatibility. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-combinatorics 7/10 Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean 2 3 ['github-actions', 'mathlib4-merge-conflict-bot', 'themathqueen'] awainverse
assignee:awainverse
0-80371
22 hours ago
8-83128
8 days ago
22-12644
22 days
28026 kim-em
author:kim-em
feat: grind annotations for `Disjoint` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 92/48 Archive/Imo/Imo2001Q3.lean,Mathlib/Data/Set/Disjoint.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/BoundedOrder/Lattice.lean,Mathlib/Order/CompleteLattice/MulticoequalizerDiagram.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/Lattice.lean 7 6 ['github-actions', 'grunweg', 'leanprover-bot', 'mathlib4-merge-conflict-bot'] nobody
0-72963
20 hours ago
0-72985
20 hours ago
41-64878
41 days
23360 kim-em
author:kim-em
chore: review of `erw` in `Algebra/Homology/DerivedCategory` t-algebra
label:t-algebra$
23/13 Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/SingleTriangle.lean,Mathlib/Algebra/Homology/HomotopyCategory/SingleFunctors.lean,Mathlib/CategoryTheory/Shift/SingleFunctors.lean 5 5 ['Ruben-VandeVelde', 'github-actions', 'kim-em', 'mathlib4-merge-conflict-bot'] nobody
0-70472
19 hours ago
0-70472
19 hours ago
83-39875
83 days
29719 kim-em
author:kim-em
feat(Topology/Algebra/Group/Units): add topological properties of units ## Summary Add lemmas about units in topological monoids: - `Submonoid.units_isOpen`: units of open submonoids are open in the units topology - `ContinuousMulEquiv.piUnits`: homeomorphism between units of a product and product of units This content was prepared by Claude from the FLT project. Source file: `/Users/kim/projects/lean/flt/FLT/Mathlib/Topology/Algebra/Group/Units.lean` GitHub source: https://github.com/ImperialCollegeLondon/FLT/blob/main/FLT/Mathlib/Topology/Algebra/Group/Units.lean 🤖 Generated with [Claude Code](https://claude.ai/code) FLT t-topology 52/0 Mathlib.lean,Mathlib/Topology/Algebra/Group/Units.lean 2 5 ['Ruben-VandeVelde', 'github-actions', 'kim-em'] nobody
0-69711
19 hours ago
1-21403
1 day ago
1-21446
1 day
26735 Raph-DG
author:Raph-DG
feat(AlgebraicGeometry): The codimension of a point of a scheme is equal to the krull dimension of the stalk In this PR we show that the codimension of a point in a scheme is equal to the krull dimension of the local ring at that point, as in stacks 02IZ. --- The proof of the main result `stalk_dim_eq_coheight` is currently a bit long for my (and I suspect the broader community's) tastes. That said, I'm not quite sure the best way to break it into pieces, any comments would be very much appreciated! - [ ] depends on: #26204 [For the notion of codimension, here we are using the coheight in the specialization order. ] - [ ] depends on: #26225 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebraic-geometry 204/1 Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Topology/KrullDimension.lean 3 3 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] erdOne
assignee:erdOne
0-67998
18 hours ago
8-44268
8 days ago
8-45042
8 days
28097 themathqueen
author:themathqueen
feat(LinearAlgebra/Matrix/PosDef): kronecker of positive (semi-)definite matrices is positive (semi-)definite This first shows that `U * x * star U` is positive (semi-)definite if and only if `x` is, for an invertible matrix `U` in a not necessarily commutative star-ring. Then using the spectral theorem, it follows that the kronecker of positive (semi-)definite matrices is positive (semi-)definite. --- - [x] depends on: #28093 - [x] depends on: #28476 - [x] depends on: #28544 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
67/6 Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/LinearAlgebra/Matrix/Kronecker.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean 4 6 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen'] joneugster
assignee:joneugster
0-67997
18 hours ago
8-20156
8 days ago
16-1512
16 days
29132 YaelDillies
author:YaelDillies
feat(AdjoinRoot): bundle operations as `AlgHom`s In particular, generalise and rename `liftHom` to use a general `eval₂` instead of `aeval`. From Toric Co-authored-by: Andrew Yang the.erd.one@gmail.com Co-authored-by: Michał Mrugała kiolterino@gmail.com --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory toric 164/103 Mathlib/Algebra/Algebra/Hom.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/Isaacs.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean,Mathlib/RingTheory/Adjoin/Field.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/LocalRing/ResidueField/Instances.lean,Mathlib/RingTheory/Localization/Away/AdjoinRoot.lean 9 3 ['erdOne', 'github-actions', 'mathlib4-merge-conflict-bot'] erdOne
assignee:erdOne
0-67996
18 hours ago
15-18908
15 days ago
17-29370
17 days
29474 sgouezel
author:sgouezel
feat: explicit zsmul field in ring constructor to solve performance issue --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
2/0 Mathlib/Algebra/Ring/InjSurj.lean 1 4 ['github-actions', 'leanprover-bot', 'sgouezel'] ocfnash
assignee:ocfnash
0-67995
18 hours ago
8-14922
8 days ago
8-14957
8 days
29330 plp127
author:plp127
chore: define `Fin.cycleIcc` with conditions Redefine `Fin.cycleIcc` using conditionals instead of composing existing `Fin` operations together. Its worst-case runtime drops from O(n) to O(1). As a bonus, the definition no longer needs explaining. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-group-theory 67/68 Mathlib/GroupTheory/Perm/Fin.lean 1 9 ['JovanGerb', 'eric-wieser', 'github-actions', 'plp127', 'tb65536'] tb65536
assignee:tb65536
0-67995
18 hours ago
13-83630
13 days ago
13-83667
13 days
29477 izanbf1803
author:izanbf1803
feat(Algebra/Ring/Invertible): add `eq_of_invOf_add_eq_invOf_add_invOf` Formalize statement and prove eq_of_invOf_add_eq_invOf_add_invOf ⅟(a + b) = ⅟a + ⅟b → a * ⅟b * a = b * ⅟a * b (for a, b in a ring; a, b invertible) This will be useful to formalize a proof in https://github.com/eric-wieser/lean-matrix-cookbook. new-contributor t-algebra
label:t-algebra$
28/0 Mathlib/Algebra/Ring/Invertible.lean 1 8 ['eric-wieser', 'github-actions', 'izanbf1803'] ocfnash
assignee:ocfnash
0-67994
18 hours ago
8-5259
8 days ago
8-5304
8 days
29497 xyzw12345
author:xyzw12345
feat(Counterexamples): A ring such that dim A = 1 but dim A[x] = 3 In this PR, we constructed an example of a commutative ring `A` that satisfies `ringKrullDim A = 1` but `ringKrullDim A[X] = 3`, following the construction of https://math.stackexchange.com/questions/1267419/examples-of-rings-whose-polynomial-rings-have-large-dimension --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
177/0 Counterexamples.lean,Counterexamples/DimensionPolynomial.lean,Mathlib.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/RingTheory/KrullDimension/LocalRing.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean 7 13 ['github-actions', 'kbuzzard', 'kckennylau', 'kim-em', 'xyzw12345'] nobody
0-60537
16 hours ago
7-39191
7 days ago
7-39219
7 days
29151 yuanyi-350
author:yuanyi-350
feat: Corollary of Hahn-Banach theorem In this PR, I have proved [Rudin, *Functional Analysis* (Theorem 3.7)][rudin1991] which is a step in proving the Closed Range Theorem. Also, I have added tags for the corresponding theorems in Rudin to mathlib. 3.7 Theorem. Suppose B is a convex, balanced, closed set in a locally convex space $X, x_0 \in X$, but $x_0 \notin B$. Then there exists $\Lambda \in X^*$ such that $|\Lambda x| \leq 1$ for all $x \in B$, but $\Lambda x_0>1$ proof. Since $B$ is closed and convex, we can apply (b) of Theorem 3.4, with $A=\{ x_0 \}$ , to obtain $\Lambda_1 \in X^*$ such that $\Lambda_1 x_0=r e^{i \theta}$ lies outside the closure $K$ of $\Lambda_1(B)$. Since $B$ is balanced, so is $K$. Hence there exists $s, 0 List.Vector.* - ... Deletions: - Nat.bit1_add_bit1 - ... Any other comments you want to keep out of the PR commit should go below the `---`, and placed outside this HTML comment, or else they will be invisible to reviewers. If this PR depends on other PRs, please list them below this comment, using the following format: - [ ] depends on: #abc [optional extra text] - [ ] depends on: #xyz [optional extra text] --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import 83/5 Mathlib/Analysis/NormedSpace/HahnBanach/Separation.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/Topology/Order/OrderClosed.lean,lake-manifest.json 4 1 ['github-actions'] faenuccio
assignee:faenuccio
0-57799
16 hours ago
0-61259
17 hours ago
17-64623
17 days
29648 loefflerd
author:loefflerd
feat(Topology/Constructions): `piMap` is inducing / embedding / etc Show that an arbitrary product of topologically inducing maps is inducing, and similarly for embeddings, etc. As an application, show that the image of SL2Z in GL2R is discrete. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-topology 182/20 Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Defs.lean,Mathlib/NumberTheory/ModularForms/ArithmeticSubgroups.lean,Mathlib/Order/Filter/Pi.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Instances/Matrix.lean 7 22 ['ADedecker', 'github-actions', 'kim-em', 'loefflerd'] ADedecker
assignee:ADedecker
0-51408
14 hours ago
3-247
3 days ago
3-288
3 days
25794 dagurtomas
author:dagurtomas
feat(CategoryTheory): localization preserves braided structure --- - [x] depends on: #29568 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *This PR continues the work from #24485.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24485* file-removed t-category-theory 212/3 Mathlib.lean,Mathlib/CategoryTheory/Localization/Monoidal/Basic.lean,Mathlib/CategoryTheory/Localization/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean 5 4 ['dagurtomas', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] mattrobball
assignee:mattrobball
0-51360
14 hours ago
0-51362
14 hours ago
45-59765
45 days
29295 YaelDillies
author:YaelDillies
chore: rename `mul_lt_mul_left`/`mul_lt_mul_right` to `mul_lt_mul_iff_right₀`/`mul_lt_mul_iff_left₀` Follow up to #28645 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-order t-algebra
label:t-algebra$
121/122 Archive/Imo/Imo2011Q3.lean,Counterexamples/CanonicallyOrderedCommSemiringTwoMul.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Defs.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/Algebra/Polynomial/Eval/Degree.lean,Mathlib/Analysis/BoxIntegral/UnitPartition.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/Analysis/Real/Cardinality.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Lemma.lean,Mathlib/Computability/Ackermann.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Nat/Totient.lean,Mathlib/Data/Ordmap/Invariants.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/ZMod/ValMinAbs.lean,Mathlib/FieldTheory/ChevalleyWarning.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean,Mathlib/MeasureTheory/Measure/Decomposition/Lebesgue.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/SeparableMeasure.lean,Mathlib/NumberTheory/Bertrand.lean,Mathlib/NumberTheory/DiophantineApproximation/Basic.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/SetTheory/Ordinal/Principal.lean,Mathlib/Tactic/Bound.lean,Mathlib/Tactic/CancelDenoms/Core.lean,Mathlib/Topology/Algebra/Monoid.lean,Mathlib/Topology/MetricSpace/Contracting.lean,Mathlib/Topology/MetricSpace/Dilation.lean,Mathlib/Topology/MetricSpace/Lipschitz.lean 44 7 ['JovanGerb', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot'] nobody
0-49995
13 hours ago
0-50014
13 hours ago
13-5927
13 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. --- - [x] depends on: #27221 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge new-contributor t-analysis 466/0 Mathlib.lean,Mathlib/Analysis/Normed/Affine/AsymptoticCone.lean,Mathlib/Order/Filter/Map.lean,Mathlib/Topology/Algebra/AsymptoticCone.lean 4 45 ['AntoineChambert-Loir', 'YaelDillies', 'gasparattila', 'github-actions', 'mathlib4-dependent-issues-bot'] YaelDillies
assignee:YaelDillies
0-49535
13 hours ago
43-11428
1 month ago
57-28965
57 days
28295 artie2000
author:artie2000
feat(Algebra/Order/Ring/Ordering): basic results about ring (pre)orderings * Basic automation for membership of ring orderings * Alternative constructors for ring preorderings and ring orderings * Basic results about ring preorderings and their supports, including the special case over a field --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #27282 maintainer-merge t-algebra
label:t-algebra$
203/0 Mathlib.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Order/Ring/Ordering/Basic.lean 3 57 ['Rob23oba', 'YaelDillies', 'artie2000', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vihdzp'] nobody
0-47926
13 hours ago
0-47926
13 hours ago
6-11065
6 days
29736 YaelDillies
author:YaelDillies
feat(Grp_): `η ≫ ι = η` and another simple lemma. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-category-theory 6/0 Mathlib/CategoryTheory/Monoidal/Cartesian/Grp_.lean 1 1 ['github-actions'] nobody
0-46954
13 hours ago
0-46954
13 hours ago
0-47003
13 hours
29737 chrisflav
author:chrisflav
feat(CategoryTheory/Sites): generating precoverage for localized topology We show that the Grothendieck topology on `Over X`, obtained from localizing the topology generated by the precoverage `K`, is generated by the preimage of `K`. The newly introduced `Precoverage.toGrothendieck` / `GrothendieckTopology.toPrecoverage` don't match the existing naming scheme for `Pretopology` and `Coverage`. The reason is that the name `GrothendieckTopology.toPrecoverage` is friendlier to dot notation (anonymous dot notation would need additional parenthesis). We will change the names for `Pretopology` and `Coverage` in a separate PR. --- I am not sure about the import increase: I consider `IsPullback` to be part of the basic limit API and maybe more of a historical fact that it lives in a rather late file in the import hierarchy. But if people are unhappy about it, I can move the lemmas requiring `IsPullback` to a separate file. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-category-theory 191/6 Mathlib/CategoryTheory/Sites/Coverage.lean,Mathlib/CategoryTheory/Sites/Over.lean,Mathlib/CategoryTheory/Sites/Precoverage.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/CategoryTheory/Sites/Sieves.lean 5 1 ['github-actions'] nobody
0-45548
12 hours ago
0-45906
12 hours ago
0-45955
12 hours
29707 loefflerd
author:loefflerd
feat(GroupTheory/Commensurable): additivize Move `Commensurable` into the `Subgroup` namespace, and add `to_additive` flags (hence auto-creating a parallel def `AddSubgroup.commensurable`) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-group-theory 43/21 Mathlib/GroupTheory/Commensurable.lean,Mathlib/NumberTheory/ModularForms/CongruenceSubgroups.lean,Mathlib/NumberTheory/ModularForms/Cusps.lean 3 4 ['Ruben-VandeVelde', 'github-actions', 'loefflerd'] nobody
0-45313
12 hours ago
0-46257
12 hours ago
0-83527
23 hours
29318 FernandoChu
author:FernandoChu
feat(CategoryTheory): (Co)limits in skeletons As [suggested in the zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Transporting.20properties.20along.20an.20equivalence.20of.20cats/with/533308058), I add here some instances for (co)limits in the skeletons. This is useful, e.g., for showing that `Subobject X` has arbitrary suprema/infima under some conditions in the underlying category. maintainer-merge new-contributor t-category-theory 77/3 Mathlib.lean,Mathlib/CategoryTheory/Limits/Skeleton.lean,Mathlib/CategoryTheory/Skeletal.lean 3 8 ['FernandoChu', 'github-actions', 'robin-carlier'] robin-carlier
assignee:robin-carlier
0-44588
12 hours ago
0-44588
12 hours ago
14-18011
14 days
29579 vlad902
author:vlad902
feat(SimpleGraph): characterize graphs with chromatic number 1 or 2 - [ ] depends on: #29578 t-combinatorics 42/7 Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean 3 7 ['github-actions', 'jt496', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vlad902'] nobody
0-43831
12 hours ago
0-48733
13 hours ago
0-54707
15 hours
29301 harahu
author:harahu
doc: hyphenate attributive compound adjectives ending in "preserving" Compound adjectives that are attributive (coming before their noun) should almost always be hyphenated in English. This PR covers such adjectives that are ending in "preserving". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge 73/73 Mathlib/Algebra/Order/CompleteField.lean,Mathlib/AlgebraicTopology/SimplicialSet/Boundary.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/Monoidal/OfHasFiniteProducts.lean,Mathlib/CategoryTheory/Preadditive/LeftExact.lean,Mathlib/CategoryTheory/Sites/Coherent/ExtensiveSheaves.lean,Mathlib/CategoryTheory/Sites/PreservesLocallyBijective.lean,Mathlib/CategoryTheory/Sites/Sheafification.lean,Mathlib/Condensed/Discrete/Colimit.lean,Mathlib/Condensed/Discrete/LocallyConstant.lean,Mathlib/Dynamics/BirkhoffSum/QuasiMeasurePreserving.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/Dynamics/Ergodic/Ergodic.lean,Mathlib/Dynamics/Ergodic/MeasurePreserving.lean,Mathlib/GroupTheory/GroupAction/DomAct/Basic.lean,Mathlib/GroupTheory/SpecificGroups/KleinFour.lean,Mathlib/LinearAlgebra/Reflection.lean,Mathlib/MeasureTheory/Constructions/Pi.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/ContinuousCompMeasurePreserving.lean,Mathlib/MeasureTheory/Function/LpSpace/DomAct/Continuous.lean,Mathlib/MeasureTheory/Group/AEStabilizer.lean,Mathlib/MeasureTheory/Group/Action.lean,Mathlib/MeasureTheory/Group/FundamentalDomain.lean,Mathlib/MeasureTheory/Measure/ContinuousPreimage.lean,Mathlib/MeasureTheory/Measure/Prod.lean,Mathlib/MeasureTheory/Measure/QuasiMeasurePreserving.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/Probability/Density.lean,Mathlib/RingTheory/FractionalIdeal/Norm.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/OrderOfVanishing.lean,Mathlib/Topology/Sheaves/SheafCondition/Sites.lean,Mathlib/Topology/Sheaves/SheafOfFunctions.lean 35 6 ['github-actions', 'harahu', 'robin-carlier'] robin-carlier
assignee:robin-carlier
0-41840
11 hours ago
0-41840
11 hours ago
14-31995
14 days
29691 YaelDillies
author:YaelDillies
feat: pushforward of a group object along a monoidal functor This is an unbundled version of `Functor.mapGrp`. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) toric t-category-theory 17/10 Mathlib/CategoryTheory/Monoidal/Grp_.lean 1 2 ['github-actions', 'mathlib4-merge-conflict-bot'] nobody
0-41319
11 hours ago
0-41345
11 hours ago
1-77216
1 day
28242 robin-carlier
author:robin-carlier
feat(CategoryTheory/Bicategory): EqToHom for bicategories We generalize the `eqToHom` construction from `Category` to `CategoryStruct`, allowing its usage in bicategorical contexts. We introduce a file `CategoryTheory/Bicategory/EqToHom` that records some of the properties of `eqToHom`s 1-morphisms and 2-morphisms, such as the transitivity up to isomorphism of `eqToHom` 1-morphisms, and congruence lemmas for unitors, associators and whiskering with respects to `eqToHom` 2-morphisms. This generalization and these congruence lemmas will be used to define icons between lax functors, and work with categories of strictly unitary lax/pseudo-functors (e.g for pseudocomposable arrows and lax-composable arrows in bicategories, which are part of the definitions of nerve constructions in bicategories). --- A follow-up PR will move some existing `eqToHom`-related lemmas from `CategoryTheory/Bicategory/Strict` to this new file. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 141/4 Mathlib.lean,Mathlib/CategoryTheory/Bicategory/EqToHom.lean,Mathlib/CategoryTheory/EqToHom.lean 3 3 ['erdOne', 'github-actions', 'robin-carlier'] erdOne
assignee:erdOne
0-36002
10 hours ago
0-36002
9 hours ago
36-18932
36 days
29664 Komyyy
author:Komyyy
fix: unexpander for `|a|ₘ` doesn't work This occurs because it's mistakenly written `@[app_unexpander abs]` instead of `@[app_unexpander mabs]`, so the fix is straightforward. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra t-meta bug
label:t-algebra$
1/1 Mathlib/Algebra/Order/Group/Unbundled/Abs.lean 1 2 ['JovanGerb', 'github-actions'] nobody
0-35677
9 hours ago
2-40699
2 days ago
2-40790
2 days
29113 scholzhannah
author:scholzhannah
chore: rename PartialHomeomorph to OpenPartialHomeomorph This PR renames `PartialHomeomorph` to `OpenPartialHomeomorph` as discussed in [#mathlib4 > Generalizing `PartialHomeomorph`?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Generalizing.20.60PartialHomeomorph.60.3F). This is the first step towards generalizing `PartialHomeomorph` to allow arbitrary sources and targets. --- This is the first time that I am doing this type of renaming. I tried to do everything well but I am not sure that I did it how it is supposed to be done. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) file-removed 1257/1021 Mathlib.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/Implicit.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ApproximatesLinearOn.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ContDiff.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/FDeriv.lean,Mathlib/Analysis/Complex/Tietze.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Analysis/Normed/Module/Ball/Homeomorph.lean,Mathlib/Analysis/SpecialFunctions/Arsinh.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogDeriv.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SpecialFunctions/Sqrt.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Inverse.lean,Mathlib/Deprecated/AnalyticManifold.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/ConformalGroupoid.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/Instances/Icc.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/IsManifold/InteriorBoundary.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/Geometry/Manifold/MFDeriv/Atlas.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/Defs.lean,Mathlib/Geometry/Manifold/MFDeriv/Tangent.lean,Mathlib/Geometry/Manifold/MFDeriv/UniqueDifferential.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/FiberwiseLinear.lean,Mathlib/Geometry/Manifold/VectorBundle/Hom.lean,Mathlib/Geometry/Manifold/VectorBundle/MDifferentiable.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/UniformConvergence.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/PolarCoord.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/FiberBundle/Basic.lean,Mathlib/Topology/FiberBundle/Constructions.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Instances/AddCircle/Defs.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/OpenPartialHomeomorph.lean,Mathlib/Topology/VectorBundle/Basic.lean,MathlibTest/MfldSetTac.lean 64 13 ['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot'] nobody
0-34614
9 hours ago
0-34638
9 hours ago
13-70371
13 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 --- - [x] depends on: #22322 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory 237/0 Mathlib.lean,Mathlib/RingTheory/DividedPowers/Padic.lean 2 5 ['github-actions', 'loefflerd', 'mariainesdff', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] mattrobball
assignee:mattrobball
0-30276
8 hours ago
1-21497
1 day ago
58-54512
58 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 19/0 Mathlib/Topology/LocallyFinsupp.lean 1 15 ['Raph-DG', 'github-actions', 'jcommelin', 'kckennylau'] jcommelin
assignee:jcommelin
0-29291
8 hours ago
9-22640
9 days ago
81-1573
81 days
28119 JasperMS
author:JasperMS
feat(Data/Set/Pairwise): prove pairwise results for Chains, move `Set.pairwise_iUnion₂` Initiate a new file `Data/Set/Pairwise/Chain.lean` which makes some `Pairwise` results available to the `IsChain` predicate. In the process, move `Set.pairwise_iUnion₂` to group it with similar results. Perform some variable harmonization. Part of Carleson, original result by Edward van de Meent. Moves: - Set.pairwise_iUnion₂: from Data.Set.Lattice to Data.Set.Pairwise.Lattice --- This PR was discussed and advice was given in [#mathlib4 > Novice questions on style and structure](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Novice.20questions.20on.20style.20and.20structure/with/533462814). Many thanks to those who helped me out! Mathlib PRs are still new to me, so please point out where I can improve! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) carleson t-data new-contributor 56/12 Mathlib.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/Data/Set/Pairwise/Chain.lean,Mathlib/Data/Set/Pairwise/Lattice.lean 4 11 ['JasperMS', 'Ruben-VandeVelde', 'edegeltje', 'github-actions'] nobody
0-29029
8 hours ago
40-20785
1 month ago
40-21225
40 days
29437 NotWearingPants
author:NotWearingPants
feat(Data/Seq): add Seq.subsequence and prove basic theorems about it I added `Seq.subsequence` to compose a sequence with a monotone function, creating a subsequence. Aliased to `Seq.comp` since it's a composition. I also added `Nat.le_induction_step_iff` which is needed to prove a subsequence is a sequence. This proves the comment at the top of `Defs.lean` that says "if `f n = none`, then `f m = none` for all `m ≥ n`" while `IsSeq` only talks about `n+1`. For completion I added the same statement for `Int`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-data new-contributor 114/0 Mathlib/Data/Int/Init.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/Data/Seq/Defs.lean 4 2 ['github-actions', 'mathlib4-merge-conflict-bot'] nobody
0-28779
7 hours ago
0-28800
7 hours ago
9-16294
9 days
26668 mariainesdff
author:mariainesdff
feat(Analysis/Normed/Unbundled/SpectralNorm): add API Co-authored-by: @faenuccio --- - [ ] depends on: #26667 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis t-number-theory 127/16 Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean 1 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] nobody
0-27422
7 hours ago
0-29928
8 hours ago
0-31530
8 hours
22151 alreadydone
author:alreadydone
feat(RingTheory): a semiprimary ring is Noetherian/Artinian iff its Jacobson radical is fg A key fact used is `Module.FG.smul`: if `I` is a two-sided ideal of `R` that is f.g. as a left ideal and `N` is a f.g. `R`-module, then `I • M` is also a f.g. `R`-module. Many lemmas about coprimality of ideals are also generalized to the noncommutative, two-sided setting. --- - [x] depends on: #21904 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory 224/157 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 9 ['alreadydone', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] eric-wieser
assignee:eric-wieser
0-27404
7 hours ago
0-34824
9 hours ago
175-7918
175 days
27969 smmercuri
author:smmercuri
feat: collections of non-trivial and pairwise inequivalent absolute values contain values that diverge around 1 If $v_1, ..., v_k$ is a a finite collection of non-trivial and pairwise inequivalent absolute values in a field, then for each $v_i$ there is a point $a$ for which $1 < v_i(a)$ while $v_j(a) < 1$ for all $j \neq i$. This generalises the corresponding result on pairs of absolute values PR'd in #27964 This PR continues the work from #22142. Original PR: https://github.com/leanprover-community/mathlib4/pull/22142 --- - [x] depends on: #27964 FLT t-algebra t-number-theory
label:t-algebra$
151/0 Mathlib/Analysis/AbsoluteValue/Equivalence.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Data/Fintype/Sum.lean 3 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
0-23004
6 hours ago
0-26907
7 hours ago
0-27192
7 hours
24789 Ruben-VandeVelde
author:Ruben-VandeVelde
chore: move Algebra.Group.Hom.End to Algebra.Ring This moves us towards the goal of not depending on `Ring` under `Algebra.Group`; this is mentioned in https://github.com/leanprover-community/mathlib4/issues/11757 and on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Call.20for.20help.3A.20technical.2F.20organisational.20debt/near/512348574). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) file-removed t-algebra
label:t-algebra$
4/10 Mathlib.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/Ring/Hom/End.lean 5 8 ['Ruben-VandeVelde', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant'] nobody
0-22435
6 hours ago
0-40472
11 hours ago
0-42069
11 hours
27288 themathqueen
author:themathqueen
chore(LinearAlgebra/TensorProduct/Basic): semi-linearize `map` and `lift` Semi-linearizing `TensorProduct.map`. This is important as we can then define `star` on tensors as: `star x := map (starLinearEquiv R) (starLinearEquiv R) x`. We can then also define the inner product on tensors. Co-authored-by: Anatole Dedecker --- Part of #27353. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
45/29 Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/RingTheory/Coalgebra/Hom.lean 3 11 ['ADedecker', 'eric-wieser', 'github-actions', 'themathqueen'] ocfnash
assignee:ocfnash
0-22039
6 hours ago
43-80952
1 month ago
55-17881
55 days
29644 faenuccio
author:faenuccio
chore(GroupWithZero/WithZero): reorganize variable names --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-algebra
label:t-algebra$
3/7 Mathlib/Algebra/GroupWithZero/WithZero.lean 1 13 ['YaelDillies', 'eric-wieser', 'faenuccio', 'github-actions'] nobody
0-21279
5 hours ago
0-21961
6 hours ago
0-52498
14 hours
26089 WilliamCoram
author:WilliamCoram
feat: restricted power series form a ring We define restricted power series over a normed ring R, and show they form a ring when R has the ultrametric property This is an update of [#23338](https://github.com/leanprover-community/mathlib4/pull/23338) to meet new expectations of PRs from forks. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra t-number-theory
label:t-algebra$
141/0 Mathlib.lean,Mathlib/RingTheory/PowerSeries/Restricted.lean 2 30 ['CBirkbeck', 'WilliamCoram', 'github-actions', 'riccardobrasca'] riccardobrasca
assignee:riccardobrasca
0-20542
5 hours ago
0-31533
8 hours ago
77-13614
77 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 t-number-theory
label:t-algebra$
88/2 Mathlib/RingTheory/DedekindDomain/Factorization.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Basic.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Over.lean 5 6 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'riccardobrasca', 'xroblot'] mariainesdff
assignee:mariainesdff
0-20483
5 hours ago
31-43225
1 month ago
64-73473
64 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$
205/20 Mathlib.lean,Mathlib/Analysis/Normed/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean 3 19 ['ADedecker', 'adamtopaz', 'github-actions', 'kbuzzard', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky'] kbuzzard
assignee:kbuzzard
0-19899
5 hours ago
35-14482
1 month ago
71-80203
71 days
29642 pechersky
author:pechersky
chore(RingTheory/AdicValuation,LaurentSeries): switch to `WithZero.exp` instead of coercions of `Multiplicative.ofAdd` as requested at https://github.com/leanprover-community/mathlib4/pull/27339#issuecomment-3285102305 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory 108/142 Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/SelmerGroup.lean,Mathlib/RingTheory/LaurentSeries.lean 5 1 ['github-actions'] nobody
0-19741
5 hours ago
0-64892
18 hours ago
3-18981
3 days
29617 gasparattila
author:gasparattila
chore: generalize `ContinuousAffineMap.contLinear` to `IsTopologicalAddTorsor` --- - [x] depends on: #29616 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 171/153 Mathlib/Analysis/Calculus/AddTorsor/AffineMap.lean,Mathlib/Analysis/Normed/Affine/ContinuousAffineMap.lean,Mathlib/Geometry/Euclidean/Projection.lean,Mathlib/Topology/Algebra/ContinuousAffineMap.lean 4 5 ['ADedecker', 'github-actions', 'mathlib4-dependent-issues-bot'] nobody
0-19304
5 hours ago
1-5443
1 day ago
1-5562
1 day
29734 bwangpj
author:bwangpj
feat(Probability/Kernel): \phi-irreducibility of kernels Define powers of kernels, the Chapman-Kolmogorov equations, as well as \phi-irreducibility of kernels, following Robert-Casella, "Monte Carlo Statistical Methods", Definition 6.13. Co-authored-by: Matteo Cipollina @or4nge19 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-measure-probability 104/8 Mathlib.lean,Mathlib/Probability/Kernel/Composition/Comp.lean,Mathlib/Probability/Kernel/Composition/CompMap.lean,Mathlib/Probability/Kernel/Irreducible.lean,docs/references.bib 5 1 ['github-actions'] nobody
0-19010
5 hours ago
0-66355
18 hours ago
0-66399
18 hours
29746 xroblot
author:xroblot
chore(NumberField/CMField): refactor The current development of `NumberField.CMField` is to develop the theory for `K/F` a quadratic extension of a totally real field by a totally complex field (`CMExtension`) and then to specialize to the special case where `F` is the maximal real subfield of `K` (`IsCM`). This leads to a lot of code duplication. Since, when `K/F` is a `CMExtension`, `F` is isomorphic to the maximal real subfield of `K`, this refactor proposes to prove all the results in the `IsCM` case, that is for the totally real maximal subfield, and then one can use the isomorphism between `F` and the maximal real subfield of `K` to deduce the analogue of these results in the `CMExtension` case. This leads to simpler code but also the removal of many results for the `CMExtension` case. Hopefully, since this is a leaf file, that should not cause too much difficulties. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-number-theory 134/198 Mathlib/NumberTheory/NumberField/CMField.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/TotallyRealComplex.lean 2 1 ['github-actions'] riccardobrasca
assignee:riccardobrasca
0-18378
5 hours ago
0-19295
5 hours ago
0-19285
5 hours
29471 harahu
author:harahu
doc: use en dash instead of hyphen in Akra-Bazzi When joining two names, like is done here, the en dash is usually preferred over a regular hyphen. This also aligns the naming in mathlib with that of [Wikipedia](https://en.wikipedia.org/wiki/Akra%E2%80%93Bazzi_method). Some concern was raised [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.23.2029464.20corrections.20to.20docs.20by.20way.20of.20LLM/near/538466767) regarding what this implies for code searches using `grep` and similar tools. Consequently, tags have been added to make sure searches using the regular hyphen will still hit the relevant files. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-computability 29/22 Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean 3 5 ['github-actions', 'mathlib4-merge-conflict-bot'] nobody
0-17515
4 hours ago
0-17539
4 hours ago
7-77218
7 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-ring-theory 256/6 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/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/LinearDisjoint.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean 10 17 ['chrisflav', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] Vierkantor
assignee:Vierkantor
0-17147
4 hours ago
3-86084
3 days ago
99-70322
99 days
29164 vlad902
author:vlad902
feat(SimpleGraph): Hall's Marriage Theorem for bipartite graphs Derive the graph theoretic proof of Hall's marriage theorem from the combinatorial version. Note that I specifically implement this for the more general case of infinite graphs that are locally finite (e.g. every vertex has only finite neighbors.) As a result, the theorem depends on some category theoretic infrastructure required for the infinite combinatorial formulation of Hall's Marriage Theorem and hence I've placed the theorems into their own file to avoid requiring it in `Matching.lean` - [ ] depends on: #29162 t-combinatorics 128/7 Mathlib.lean,Mathlib/Combinatorics/Hall/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Hall.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,docs/1000.yaml 5 2 ['github-actions', 'mathlib4-dependent-issues-bot'] nobody
0-16471
4 hours ago
3-56996
3 days ago
3-60225
3 days
28699 chrisflav
author:chrisflav
feat(RingTheory/Cotangent): cotangent of composition with localization away from an element Let `R → S → T` be algebras such that `T` is the localization of `S` away from one element, where `S` is generated over `R` by `P : R[X] → S` with kernel `I` and `Q : S[Y] → T` is the canonical `S`-presentation of `T` with kernel `K`. Denote by `J` the kernel of the composition `R[X,Y] → T`. We deduce `J/J² ≃ₗ[T] T ⊗[S] (I/I²) × K/K²` from the Jacobi Zariski sequence. From Pi1. --- - [x] depends on: #28697 The import increase is expected: This file was PRed in two steps and only the second one depends on more imports. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory large-import 157/4 Mathlib/RingTheory/Extension/Cotangent/LocalizationAway.lean,Mathlib/RingTheory/Extension/Generators.lean,Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/RingTheory/Smooth/StandardSmoothCotangent.lean 4 4 ['chrisflav', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot'] erdOne
assignee:erdOne
0-16319
4 hours ago
27-23401
27 days ago
27-24814
27 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$
105/0 Mathlib.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Nilpotent/Defs.lean,Mathlib/RingTheory/Nilpotent/GeometricallyReduced.lean,Mathlib/RingTheory/TensorProduct/Basic.lean 5 61 ['dleijnse', 'github-actions', 'joelriou', 'kckennylau'] joelriou
assignee:joelriou
0-15990
4 hours ago
6-44134
6 days ago
53-23790
53 days
27306 xyzw12345
author:xyzw12345
feat: `lie_ring` tactic and `LieReduce` command This PR continues the work from #22196. Original PR: https://github.com/leanprover-community/mathlib4/pull/22196 t-meta 783/2 Mathlib.lean,Mathlib/Algebra/Lie/Derivation/AdjointAction.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LieAlgebra/Basic.lean,Mathlib/Tactic/LieAlgebra/LieRingNF.lean,Mathlib/Util/AtomM.lean,MathlibTest/lie_ring.lean,scripts/noshake.json 8 7 ['JovanGerb', 'github-actions', 'xyzw12345'] JovanGerb
assignee:JovanGerb
0-15514
4 hours ago
8-58584
8 days ago
56-25666
56 days
29596 alreadydone
author:alreadydone
chore(Algebra): extract `Submonoid.IsLocalizationMap` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
282/119 Mathlib.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/Lemmas.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/RingTheory/Extension/Presentation/Submersive.lean,Mathlib/RingTheory/Localization/Defs.lean 7 3 ['github-actions', 'mathlib4-merge-conflict-bot'] nobody
0-15493
4 hours ago
0-21542
5 hours ago
4-34468
4 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/) t-algebra t-number-theory
label:t-algebra$
73/77 Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/RingTheory/LaurentSeries.lean 2 8 ['Louddy', 'faenuccio', 'github-actions', 'mathlib4-merge-conflict-bot', 'pechersky'] Vierkantor
assignee:Vierkantor
0-15047
4 hours ago
0-19850
5 hours ago
51-36447
51 days
29709 llllvvuu
author:llllvvuu
refactor(LinearAlgebra/Matrix): move lemmas around to reduce imports This makes results such as `Matrix.det_one_sub_mul_comm` and `Matrix.eval_det` more accessible. From https://github.com/leanprover-community/mathlib4/pull/29709#issuecomment-3297172309, > | File | Base Count | Head Count | Change | > | --- | --- | --- | --- | > | Mathlib.LinearAlgebra.Matrix.SchurComplement | 2231 | 1438 | -793 (-35.54%) | --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra
label:t-algebra$
112/124 Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/RingTheory/MatrixPolynomialAlgebra.lean 5 6 ['eric-wieser', 'github-actions', 'themathqueen'] nobody
0-13978
3 hours ago
1-35921
1 day ago
1-36680
1 day
29713 jessealama
author:jessealama
feat (Algebra/Homology): add Euler-Poincaré formula This PR adds the Euler characteristic for chain complexes and proves the Euler-Poincaré formula relating the alternating sum of chain dimensions to the alternating sum of homology dimensions. ### Main definitions (in `EulerCharacteristic.lean`) * `ChainComplex.signZ`: The alternating sign function for ℤ-indexed complexes * `ChainComplex.boundedEulerCharZ`: The Euler characteristic over a finite set * `ChainComplex.eulerChar`: The Euler characteristic as an infinite sum * `ChainComplex.homologyBoundedEulerCharZ`: The homological Euler characteristic over a finite set * `ChainComplex.homologyEulerChar`: The homological Euler characteristic as an infinite sum All definitions work with ℤ-indexed complexes and take a reference point parameter to determine where the alternating sign pattern starts. ### Main results (in `EulerPoincare.lean`) * `ChainComplex.eulerChar_eq_homology_eulerChar`: For ℤ-indexed bounded chain complexes of finite-dimensional vector spaces that vanish outside a finite interval [a,b], the alternating sum of dimensions equals the alternating sum of homology dimensions ### Supporting lemmas The proof includes several supporting lemmas: * Interval splitting lemmas for telescoping sums * Dimension decomposition lemmas using the rank-nullity theorem * Lemmas about vanishing differentials at boundaries * A general telescoping sum lemma for alternating sums This is part of a series of PRs building toward a formalization of Euler's polyhedron formula (Wiedijk #13). --- * depends on: (none) * related to: #29639, #29643, #29646 new-contributor t-algebra
label:t-algebra$
471/0 Mathlib.lean,Mathlib/Algebra/Homology/EulerCharacteristic.lean,Mathlib/Algebra/Homology/EulerPoincare.lean 3 17 ['github-actions', 'jessealama', 'joelriou', 'kim-em'] nobody
0-13968
3 hours ago
0-20385
5 hours ago
1-30239
1 day
29680 jt496
author:jt496
chore(Combinatorics/SimpleGraph): split long file `Combinatorics.SimpleGraph.Walk` Split the long file `Combinatorics.SimpleGraph.Walk` into two files and deprecate: 1. `Combinatorics.SimpleGraph.Walks` contains all material not dependent on `getVert` 2. `Combinatorics.SimpleGraph.Connectivity.GetVert` contains all material using `getVert` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-combinatorics 1536/1490 Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/GetVert.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkDecomp.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Combinatorics/SimpleGraph/Walks.lean 6 2 ['github-actions', 'mathlib4-merge-conflict-bot'] nobody
0-11720
3 hours ago
0-44039
12 hours ago
1-83951
1 day
28489 joelriou
author:joelriou
feat(CategoryTheory): weaken assumptions for the stability of the left lifting property under transfinite compositions This PR introduces two predicates `HasLiftingPropertyFixedBot/Top` which assert the existence of a lifting in squares when the left/right/top (resp. left/right/bottom) morphisms are fixed. (This weakens the `HasLiftingProperty` class which assumes there is a lifting when we only fix the left and right morphisms.) The `HasLiftingPropertyFixedTop` variant shall be used in the study of the homotopy theory of Kan complexes. The `HasLiftingPropertyFixedBot` variant will be used in the formalization of the model category structure on simplicial sets: this is the reason why this PR also weakens the assumptions in the proof that the left lifting property with respect to certain morphisms is stable under transfinite composition. --- In https://github.com/joelriou/topcat-model-category/blob/c3fe37ef7a2f6bfa48c4b989aec12bbab25784b1/TopCatModelCategory/TopCat/SerreFibrationLocal.lean#L314 the content of this PR is used in an essential way in order to show that the property that a continuous map `E ⟶ B` is a Serre fibration is local on the base (this still depends on a `sorry`). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-category-theory 28/2 Mathlib/CategoryTheory/LiftingProperties/Basic.lean,Mathlib/CategoryTheory/SmallObject/TransfiniteCompositionLifting.lean 2 1 ['github-actions'] b-mehta
assignee:b-mehta
0-10138
2 hours ago
33-9721
1 month ago
33-9702
33 days
29663 euprunin
author:euprunin
chore(Combinatorics/Matroid/Minor): golf entire `Matroidᵣ.coe_inj` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-combinatorics 1/2 Mathlib/Combinatorics/Matroid/Minor/Restrict.lean 1 2 ['github-actions', 'grunweg'] nobody
0-10113
2 hours ago
0-10113
2 hours ago
2-40900
2 days
29685 vihdzp
author:vihdzp
feat: theorems on `MulArchimedeanClass.mk (a / b)` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-algebra
label:t-algebra$
20/0 Mathlib/Algebra/Order/Archimedean/Class.lean 1 2 ['Ruben-VandeVelde', 'github-actions', 'wwylele'] nobody
0-9702
2 hours ago
0-9702
2 hours ago
1-84726
1 day
26129 LessnessRandomness
author:LessnessRandomness
feat(Geometry/Euclidean/Angle/Unoriented): triangle inequality for angles This PR continues the work from #24206. Original PR: https://github.com/leanprover-community/mathlib4/pull/24206 new-contributor t-euclidean-geometry 203/16 Mathlib.lean,Mathlib/Analysis/Fourier/FiniteAbelian/Orthogonality.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/TriangleInequality.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean 8 76 ['JovanGerb', 'LessnessRandomness', 'Timeroot', 'github-actions', 'jsm28', 'mathlib4-merge-conflict-bot', 'themathqueen'] jsm28
assignee:jsm28
0-9616
2 hours ago
12-72733
12 days ago
88-14129
88 days
29678 vihdzp
author:vihdzp
feat: stronger version of `ArchimedeanClass.mk_le_mk` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-order t-algebra easy
label:t-algebra$
7/0 Mathlib/Algebra/Order/Archimedean/Class.lean 1 2 ['Ruben-VandeVelde', 'github-actions', 'wwylele'] nobody
0-8712
2 hours ago
0-8712
2 hours ago
2-13825
2 days
29673 xroblot
author:xroblot
feat(Algebra): add `Algebra.adjoin_trans` If `A` is spanned over `R` by `s`, then the algebra spanned over `A` by `t` is the equal to the algebra spanned over `R` by `s ∪ t`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory maintainer-merge 11/0 Mathlib/RingTheory/Adjoin/Basic.lean 1 2 ['Ruben-VandeVelde', 'github-actions'] nobody
0-8604
2 hours ago
0-8604
2 hours ago
2-23603
2 days
28820 yury-harmonic
author:yury-harmonic
feat(PeriodicPts, OrderOfElement): add `nontriviality` lemmas Also golf 1 proof. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge 25/19 Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/Logic/Function/Defs.lean 3 4 ['Ruben-VandeVelde', 'github-actions', 'mathlib4-merge-conflict-bot'] nobody
0-8139
2 hours ago
0-8139
2 hours ago
12-67837
12 days
29747 JovanGerb
author:JovanGerb
feat(Order/Filter/Basic): `gcongr` for `EventuallyEq` This was originally requested in [#mathlib4 > ✔ `rw` with ae relations](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.E2.9C.94.20.60rw.60.20with.20ae.20relations/with/529301301) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) 55/83 Mathlib/MeasureTheory/Function/ConditionalExpectation/AEMeasurable.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Real.lean,Mathlib/MeasureTheory/VectorMeasure/Decomposition/Lebesgue.lean,Mathlib/Order/Filter/Basic.lean 6 1 ['github-actions'] grunweg
assignee:grunweg
0-8060
2 hours ago
0-25181
6 hours ago
0-25162
6 hours
29607 wwylele
author:wwylele
feat(RingTheory): summability lemma for (Mv)PowerSeries About `PowerSeries.summable_of_tendsto_weightedOrder_atTop_nhds_top`, it surprised me that `PowerSeries.order` isn't implemented using `MvPowerSeries.order`, so I had to duplicate the proof for `MvPowerSeries` and `PowerSeries`. The other lemmas are also duplication instead of reusing the same proof, because it turned out piercing through defeq actually makes the code longer. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory maintainer-merge 80/0 Mathlib/RingTheory/MvPowerSeries/PiTopology.lean,Mathlib/RingTheory/PowerSeries/PiTopology.lean 2 2 ['Ruben-VandeVelde', 'github-actions'] nobody
0-6247
1 hour ago
0-6247
1 hour ago
4-74196
4 days
29532 Aaron1011
author:Aaron1011
feat: add group/field versions of Filter.map_*_atTop_eq_nat Add Filter.map_add_atTop_eq, Filter.map_sub_atTop_eq, and Filter.map_div_atTop_eq, which correspond to Filter.map_add_atTop_eq_nat, Filter.map_sub_atTop_eq_nat, and Filter.map_div_atTop_eq_nat respectively. These theorems apply to ordered groups/fields --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge new-contributor t-order 14/0 Mathlib/Order/Filter/AtTopBot/Archimedean.lean,Mathlib/Order/Filter/AtTopBot/Field.lean 2 2 ['Ruben-VandeVelde', 'github-actions'] nobody
0-5898
1 hour ago
0-5899
1 hour ago
6-65394
6 days
29324 tb65536
author:tb65536
refactor(Analysis/Calculus/IteratedDeriv/Defs): tweak statement of `iteratedDerivWithin_one` This PR removes the `x` from `iteratedDerivWithin_one` to make it match `iteratedDerivWithin_zero`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-analysis 3/2 Mathlib/Analysis/Calculus/IteratedDeriv/Defs.lean 1 3 ['Ruben-VandeVelde', 'github-actions', 'grunweg'] grunweg
assignee:grunweg
0-5769
1 hour ago
14-1711
14 days ago
14-1693
14 days
29516 kckennylau
author:kckennylau
chore: Deprecate IsAdjoinRoot.subsingleton This PR deprecates `IsAdjoinRoot.subsingleton` in favour of the new `Algebra.subsingleton`: ```lean theorem IsAdjoinRoot.subsingleton {R : Type u} {S : Type v} [CommRing R] [Ring S] {f : Polynomial R} [Algebra R S] (h : IsAdjoinRoot S f) [Subsingleton R] : Subsingleton S theorem Algebra.subsingleton (R : Type u) (A : Type v) [CommSemiring R] [Semiring A] [Algebra R A] [Subsingleton R] : Subsingleton A ``` --- Zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/IsAdjoinRoot.2Esubsingleton/with/538731602 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge 9/3 Mathlib/Algebra/Algebra/Defs.lean,Mathlib/RingTheory/IsAdjoinRoot.lean 2 2 ['Ruben-VandeVelde', 'github-actions'] nobody
0-5622
1 hour ago
0-5622
1 hour ago
6-84312
6 days
29275 wwylele
author:wwylele
feat(GroupTheory): add DivisibleHull This is part of Hahn embedding theorem #27268, where an a ordered group is first embedded in a divisible group / Q-module. I am aware at #25662 there is also an ongoing rewrite of `LocalizedModule` that this PR uses. Hopefully I avoided interfering it by using mostly with public API. --- - [x] depends on: #29277 - [x] depends on: #29388 - [x] depends on: #29386 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-group-theory 442/1 Mathlib.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/PNat.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/GroupTheory/DivisibleHull.lean 5 94 ['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp', 'wwylele'] nobody
0-5090
1 hour ago
1-6649
1 day ago
9-5743
9 days
29407 pechersky
author:pechersky
feat(RingTheory): hom from local ring to ZMod is a local hom complex imports make it difficult to find a good file to place in --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory large-import 5/0 Mathlib/RingTheory/LocalRing/RingHom/Basic.lean 1 11 ['github-actions', 'leanprover-bot', 'mattrobball', 'pechersky'] mattrobball
assignee:mattrobball
0-3725
1 hour ago
0-15757
4 hours ago
10-4636
10 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
27229 WilliamCoram
author:WilliamCoram
feat(GroupTheory/DoubleCoset): multiple lemmas From FLT --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-group-theory new-contributor 106/0 Mathlib/GroupTheory/DoubleCoset.lean 1 2 ['github-actions', 'mathlib4-merge-conflict-bot'] mariainesdff
assignee:mariainesdff
41-25452
1 month ago
41-26185
1 month ago
57-74147
57 days
27991 sinianluoye
author:sinianluoye
feat (Rat): add Rat.den_eq_of_add_den_eq_one and its dependent lemmas ```lean4 example {q r : ℚ} (h : (q + r).den = 1) : q.den = r.den := by ``` It is so simple, but I couldn't find it in current mathlib repo. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor 28/0 Mathlib/Data/Rat/Lemmas.lean 1 14 ['github-actions', 'sinianluoye', 'themathqueen'] nobody
41-8167
1 month ago
42-67570
1 month ago
43-9221
43 days
26765 KiringYJ
author:KiringYJ
feat(MeasureTheory/PiSystem): add π-λ theorem and SetLike instance Add two small features to `MeasureTheory/PiSystem`: 1. SetLike instance `instance : SetLike (DynkinSystem α) (Set α)` This lets us write `s ⊆ d` and `t ∈ d` for a DynkinSystem `d`, matching usual mathlib style. 2. `DynkinSystem.pi_lambda` lemma Classical π‑λ theorem: if a π‑system `s` is contained in a Dynkin system `d`, every set measurable for `σ(s)` is also in `d`. Currently, mathlib exposes this result only indirectly (e.g. via `generateFrom_eq`). Although logically equivalent, it is not obvious at first glance that those lemmas are the π‑λ theorem. The new lemma states the result in its familiar textbook form, so users can recognise and cite it immediately. Both pieces are under 10 lines, term‑mode only, and do not modify existing APIs. No breaking changes. No dependencies. new-contributor t-measure-probability 13/0 Mathlib/MeasureTheory/PiSystem.lean 1 13 ['EtienneC30', 'KiringYJ', 'github-actions', 'ocfnash'] RemyDegenne
assignee:RemyDegenne
40-67980
1 month ago
48-17629
1 month ago
75-5470
75 days
28077 ShreckYe
author:ShreckYe
feat(Data/Finset/Card): add some more Pigeonhole Principle theorems `exists_ne_map_eq_of_card_image_lt` and `not_injOn_of_card_image_lt` `exists_ne_map_eq_of_card_image_lt` is a special case of `exists_ne_map_eq_of_card_lt_of_maps_to` where `t` is `s.image f`, and `not_injOn_of_card_image_lt` is its variant using `Set.InjOn`. I ran into some cases where such theorems would save me some time. t-data new-contributor 10/0 Mathlib/Data/Finset/Card.lean 1 4 ['ShreckYe', 'github-actions', 'themathqueen'] nobody
37-22278
1 month ago
41-34060
1 month ago
41-34105
41 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'] urkud
assignee:urkud
36-67992
1 month ago
68-20719
2 months ago
68-20768
68 days
27815 BGuillemet
author:BGuillemet
feat(CategoryTheory/Limits/Shapes/Products): add limMapPi and sigmaMapColim Add the canonical morphism from a limit to the product over its objects. Prove that it is a monomorphism. Dually, add the canonical morphism to a colimit from the coproduc of its objects and prove that it is an epimorphism. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-category-theory 44/0 Mathlib/CategoryTheory/Limits/Shapes/Products.lean 1 1 ['github-actions'] jcommelin
assignee:jcommelin
36-67987
1 month ago
47-27689
1 month ago
47-27712
47 days
27552 Equilibris
author:Equilibris
refactor: make universe levels visible in typevec This will be needed to allow `M.corec` to be generic across universes --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor easy 16/10 Mathlib/Data/TypeVec.lean 1 9 ['Equilibris', 'eric-wieser', 'github-actions', 'plp127'] nobody
35-49134
1 month ago
36-1553
1 month ago
52-14069
52 days
28198 Sebi-Kumar
author:Sebi-Kumar
feat(Analysis/InnerProductSpace/PiL2): Add instances for EuclideanSpace rank and EuclideanSpace being infinite Add an instance for `Fact (Module.finrank 𝕜 (EuclideanSpace 𝕜 (Fin n)) = n)` which is needed to apply [stereographic'](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Geometry/Manifold/Instances/Sphere.html#stereographic') to EuclideanSpace. Also add an instance for `Infinite (EuclideanSpace 𝕜 ι)` where `ι` is a nonempty fintype. I wasn't sure if these should go in separate pull requests, but they seemed similar enough to me. Thank you to Kenny Lau for the suggestions at [#mathlib4 > Instances for EuclideanSpace](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Instances.20for.20EuclideanSpace). --- To provide additional context, I am new to contributing to Mathlib, and I am doing so as a part of the Fields Undergraduate Summer Research Program at the University of Western Ontario under the supervision of Chris Kapulkin and Daniel Carranza. My goal is to contribute that the `n`-sphere is simply connected for `n > 1`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-analysis 6/0 Mathlib/Analysis/InnerProductSpace/PiL2.lean 1 1 ['github-actions'] urkud
assignee:urkud
30-67972
30 days ago
37-81208
1 month ago
37-81251
37 days
28125 nonisomorphiclinearmap
author:nonisomorphiclinearmap
feat(Combinatorics): basic definition of simplicial complexes This PR introduces the basic definition of a finite (abstract) simplicial complex, located in Mathlib/Combinatorics/SimplicialComplex/Basic.lean. --- This is our first contribution to mathlib. This work was done as part of the Fields Institute Summer Undergraduate Program on formalization in topological combinatorics. Eventually, we aim to formalize Lovasz's proof of the Kneser Conjecture and this is a small stepping stone in that direction. Some other commits will shortly depend on this one. We would like to acknowledge the Fields Institute for Research in Mathematical Sciences for their sponsorship. We would also like to thank our supervisors, Professor Chris Kapulkin and Mr. Daniel Carranza, for their guidance and support throughout this project. We would also like to thank our group members Tom Lindquist and Quang Minh Nguyen for our fruitful discussions. new-contributor t-combinatorics 374/0 Mathlib.lean,Mathlib/Combinatorics/SimplicialComplex/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Category.lean,Mathlib/Combinatorics/SimplicialComplex/FacePoset.lean,Mathlib/Combinatorics/SimplicialComplex/Hom.lean 5 1 ['github-actions'] awainverse
assignee:awainverse
28-67995
28 days ago
40-64
1 month ago
40-106
40 days
28186 Sebi-Kumar
author:Sebi-Kumar
feat(Topology/Homotopy/Path): Add IsEquiv instance for Path.Homotopic Add `instance : IsEquiv (Path x₀ x₁) Homotopic` to the library. Allow use of lemmas like `of_eq` when proving two paths are homotopic. --- To provide additional context, I am relatively new to contributing to Mathlib, and I am doing so as a part of the Fields Undergraduate Summer Research Program hosted at the University of Western Ontario and supervised by Chris Kapulkin and Daniel Carranza. My goal is to prove that the `n`-sphere is simply connected for `n > 1`. Also, I am not super familiar with `IsEquiv` and when it should/shouldn't be used. I just wanted to use a lemma like `Path.Homotopic.of_eq` at one point while working on my code, and thought this was the best way to add such a result to the library. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-topology 5/0 Mathlib/Topology/Homotopy/Path.lean 1 4 ['Sebi-Kumar', 'github-actions', 'kckennylau'] PatrickMassot
assignee:PatrickMassot
28-67992
28 days ago
38-12922
1 month ago
38-12967
38 days
28812 yury-harmonic
author:yury-harmonic
feat(PNat/Factors): add attrs and lemmas --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor 42/0 Mathlib/Data/PNat/Factors.lean 1 1 ['github-actions'] nobody
25-17200
25 days ago
25-17356
25 days ago
25-17393
25 days
27245 rirarika
author:rirarika
feat: multivariate polynomial ring properties about irreducibility --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
88/0 Mathlib.lean,Mathlib/Algebra/MvPolynomial/Irreducible.lean 2 5 ['alreadydone', 'github-actions', 'mbkybky'] alreadydone
assignee:alreadydone
25-14389
25 days ago
61-42835
1 month ago
61-42875
61 days
28195 gasparattila
author:gasparattila
feat: separating a convex compact set and its neighborhood with a polytope --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-analysis 26/1 Mathlib/Analysis/Normed/Affine/Convex.lean 1 2 ['FrankieNC', 'github-actions'] sgouezel
assignee:sgouezel
24-67975
24 days ago
37-83909
1 month ago
37-83960
37 days
28766 yury-harmonic
author:yury-harmonic
feat(Nat/Factorial): add tail-recursive versions --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor 58/1 Mathlib/Data/Nat/Factorial/Basic.lean 1 1 ['github-actions', 'plp127'] nobody
24-67279
24 days ago
26-47367
26 days ago
26-47414
26 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$
36/0 Mathlib/Analysis/Normed/Operator/LinearIsometry.lean 1 24 ['Ruben-VandeVelde', 'dagurtomas', 'eric-wieser', 'github-actions', 'jcreedcmu', 'themathqueen'] dagurtomas
assignee:dagurtomas
23-80713
23 days ago
23-80713
23 days ago
53-63021
53 days
28768 yury-harmonic
author:yury-harmonic
feat(Data/Nat): define `Nat.nthRoot` Define `Nat.nthRoot n a` to be the `n`th root of a natural number `a`. --- This is a dependency of a `norm_num` plugin that can handle `(8 : Real) ^ (2 / 3 : Real)`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor 218/0 Mathlib.lean,Mathlib/Data/Nat/NthRoot/Defs.lean,Mathlib/Data/Nat/NthRoot/Lemmas.lean 3 16 ['b-mehta', 'eric-wieser', 'github-actions', 'j-loreaux', 'yury-harmonic'] nobody
21-80224
21 days ago
25-53533
25 days ago
26-8216
26 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 6 ['IvanRenison', 'github-actions', 'vlad902'] kmill
assignee:kmill
21-30236
21 days ago
113-73762
3 months ago
113-73812
113 days
28630 Antidite
author:Antidite
feat(Archive/Imo): right isosceles configuration in the complex plane feat(Archive/Imo): right isosceles configuration in the complex plane This adds `Archive/Imo/Imo1975Q3.lean`, formalizing a triangle configuration with points A=0, B=1, C=z and auxiliary points R, P, Q built via complex rotations and sine-based scale factors. Main results: * `angle_and_distance`: ∠QRP = π/2 and dist Q R = dist R P. * Key identity `QRP_rot90`: (Q z).z − R.z = e^{iπ/2} · ((P z).z − R.z). Design/Style: * Minimal imports; module docstring; semantic lemma names; all definitions and theorems live under the namespace `IMO.TriangleConfig`. Moves: - (none) Deletions: - (none) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) IMO new-contributor 196/0 Archive.lean,Archive/Imo/Imo1975Q3.lean 2 36 ['Antidite', 'LLaurance', 'github-actions', 'jsm28'] jsm28
assignee:jsm28
20-11790
20 days ago
29-38953
29 days ago
29-38994
29 days
28676 sun123zxy
author:sun123zxy
feat(NumberTheory/ArithmeticFunction): wrap `Nat.totient` as an `ArithmeticFunction` This wraps the Euler's totient function `Nat.totient` into a new `ArithmeticFunction` `ϕ`, with some basic identities such as `ϕ * ζ = id` and `μ * id = ϕ.` --- We use the notation `ϕ` to distinguish from `Nat.totient`'s notation `φ`, however this might be controversial. Suggestions are welcome! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import new-contributor t-number-theory 49/3 Mathlib/NumberTheory/ArithmeticFunction.lean 1 10 ['MichaelStollBayreuth', 'b-mehta', 'eric-wieser', 'github-actions', 'sun123zxy'] MichaelStollBayreuth
assignee:MichaelStollBayreuth
17-3913
17 days ago
28-55157
28 days ago
28-56125
28 days
25883 pfaffelh
author:pfaffelh
feat: introduce Gram matrices A Gram matrix has entry `⟪v i, v j⟫` at `i j : n`, where `v : n → α` is an `InnerProductSpace 𝕜 α`. Give this notion and show that Gram matrices are positive semi-definite. This will be used later in order to show that the covariance matrix for Brownian Motion is positive semi-definite. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- *This PR continues the work from #24575.* *Original PR: https://github.com/leanprover-community/mathlib4/pull/24575* migrated-from-branch new-contributor t-analysis 142/2 Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramMatrix.lean,Mathlib/MeasureTheory/Function/L2Space.lean 3 38 ['EtienneC30', 'eric-wieser', 'github-actions', 'pfaffelh'] hrmacbeth
assignee:hrmacbeth
16-67969
16 days ago
27-84761
27 days ago
71-20370
71 days
28296 strihanje01
author:strihanje01
feat(Combinatorics/Additive/VerySmallDoubling): Hamidoune's Freiman-Kneser theorem for nonabelian groups add noncommutative Freiman-Kneser theorem for doubling less than 2-\epsilon --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import new-contributor t-combinatorics 339/3 Mathlib/Combinatorics/Additive/VerySmallDoubling.lean 1 14 ['YaelDillies', 'github-actions', 'strihanje01'] awainverse
assignee:awainverse
16-67967
16 days ago
27-24821
27 days ago
29-1668
29 days
28602 gmcninch-tufts
author:gmcninch-tufts
feat(Algebra/Polynomial/Module): prove equivalence of a certain tensor product with PolynomialModule For a commutative ring `R` and an `R`-module `M`, construct an equivalence between the `R[X]`-modules `R[X] ⊗[R] M` and `PolynomialModule R M`. This equivalence enables application of some base-change results to `PolynomialModule R M` . --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra
label:t-algebra$
210/0 Mathlib.lean,Mathlib/Algebra/Polynomial/Module/TensorProduct.lean 2 1 ['github-actions'] jcommelin
assignee:jcommelin
15-67992
15 days ago
30-17068
30 days ago
30-17109
30 days
28906 gasparattila
author:gasparattila
feat(Topology/Algebra/Module): `prod` and `coprod` as `ContinuousLinearEquiv`s --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-topology 36/5 Mathlib/Topology/Algebra/Module/LinearMapPiProd.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean 2 1 ['github-actions'] jcommelin
assignee:jcommelin
13-67998
13 days ago
23-8165
23 days ago
23-8202
23 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 46/1 Mathlib/Combinatorics/Enumerative/Bell.lean 1 11 ['AntoineChambert-Loir', 'FlAmmmmING', 'eric-wieser', 'github-actions', 'kckennylau', 'madvorak'] awainverse
assignee:awainverse
13-50268
13 days ago
74-13394
2 months ago
74-13437
74 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 3 ['WangYiran01', 'github-actions'] b-mehta
assignee:b-mehta
13-46802
13 days ago
68-37954
2 months ago
68-37995
68 days
28546 Sfgangloff
author:Sfgangloff
feat(SymbolicDynamics): basic setup of Zd, full shift, cylinders, pat… # Symbolic dynamics on groups: core API and entropy along finite shapes This PR adds a **group-generic** foundation for symbolic dynamics over an arbitrary group `G`, together with convenient specializations for `ℤ` and `ℤ^d`. ## Summary of additions - **Full shift and shift action** - `abbrev FullShift (A G) := G → A` (inherits product topology from the Π-type). - Right shift `shift g x` with convention `(shift g x) h = x (h * g)`. - **Cylinders and topology** - `cylinder U x : Set (G → A)` for finite `U : Finset G`. - Cylinders are open under `[DiscreteTopology A]`; with a finite alphabet they are also closed. - Equality with dependent products: `cylinder U x = Set.pi (↑U) (fun i => ({x i} : Set A))`, enabling use of the `Set.pi` API. - **Patterns, occurrences, and subshifts** - `Pattern A G` with finite `support : Finset G` and `data : support → A`. - `Pattern.occursIn p x g` (occurrence at translate `g`) and the expected shift law. - `forbids F` and `Subshift A G` (closed, shift-invariant subsets). - `FixedSupport A G U` with an equivalence to `(U → A)` to obtain finiteness. - **Language on finite shapes and counting** - `languageOn X U`, `languageCardOn X U`, and `patternCountOn Y U`. - **Entropy along a shape sequence** - `limsupAtTop` (as an `sInf` of eventual upper bounds). - `entropyAlong X F hF := limsup (log (patternCountOn X (F n) + 1) / |F n|)` for any nonempty finite shapes `F : ℕ → Finset G` (the `+ 1` avoids `log 0`). - **Specializations** - `IntShapes`: segments `[-n,n]` on `Multiplicative ℤ`, with `entropy_Z`. - `ZdShapes`: boxes `[-n,n]^d` on `ℤ^d` (as functions `Fin d → ℤ`), with `entropy_Zd`. ## Mathematical remarks - The API is **shape-parametric**: entropy is defined along user-provided finite shapes. - On **amenable** groups, using a **Følner** sequence yields a canonical value (Ornstein–Weiss). This PR does not assume amenability; the family of shapes is an explicit input. ## Motivation Provide a clean, reusable base for symbolic dynamics on groups in mathlib. ## Future work - Add a Følner predicate and prove shape-independence / limit existence on amenable groups. - Expand the `ℤ`/`ℤ^d` toolkit (alternative shapes, mixing, factors). - Develop 1D theory and, longer-term, multidimensional SFT results (e.g. along the lines of Hochman–Meyerovitch). new-contributor t-dynamics 513/0 Mathlib.lean,Mathlib/Dynamics/SymbolicDynamics/Basic.lean,Mathlib/Dynamics/SymbolicDynamics/EntropyFinitelyGenerated.lean 3 14 ['Sfgangloff', 'eric-wieser', 'github-actions', 'kckennylau', 'sgouezel'] sgouezel
assignee:sgouezel
12-44703
12 days ago
31-23374
1 month ago
31-23413
31 days
28613 espottesmith
author:espottesmith
feat(Combinatorics): define undirected hypergraphs This PR defines undirected hypergraphs: ``` @[ext] structure Hypergraph (α : Type*) where /-- The vertex set -/ vertexSet : Set α /-- The hyperedge set -/ hyperedgeSet : Set (Set α) /-- All hyperedges must be subsets of the vertex set -/ hyperedge_isSubset_vertexSet : ∀ ⦃e⦄, e ∈ hyperedgeSet → e ⊆ vertexSet ``` In addition to the main definition, some additional definitions and related lemmas are provided: - vertex adjacency - hyperedge adjacency - vertex "stars" - special cases (loops, empty hypergraphs, trivial hypergraphs, complete hypergraphs, simple hypergraphs, k-uniform hypergraphs, and d-regular hypergraphs) - (some) hypergraph cardinality - subhypergraphs, induced subhypergraphs, and partial hypergraphs This implementation is certainly bare-bones. I'm submitting this PR at this point, rather than when my developments are more fleshed out, because there has been some interest in others contributing to hypergraph formalization in mathlib. In the near future, goals include: - defining incidence matrices (i.e., conversion from `Hypergraph α` to `Matrix α (Set α) β` - coersion/generalization of graph as 2-uniform hypergraph - conversion of a hypergraph into its associated clique graph/two-section graph - constructing the dual of a hypergraph (note: on first blush, this appears somewhat challenging, given that we define hyperedges as `Set α` rather than some other type `β`) - rank and co-rank - walks, paths, cycles, etc. on hypergraphs --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-combinatorics 375/0 Mathlib.lean,Mathlib/Combinatorics/Hypergraph/Basic.lean 2 52 ['b-mehta', 'espottesmith', 'github-actions', 'jt496', 'lauramonk', 'mathlib4-merge-conflict-bot'] b-mehta
assignee:b-mehta
12-34045
12 days ago
12-34045
12 days ago
18-20232
18 days
29040 PMKielstra
author:PMKielstra
feat: trapezoidal rule for integration This PR defines the trapezoidal rule and proves the standard error bound on it in terms of bounds on the second derivative. I have vague plans of using this plus interval arithmetic to develop a tactic that can automatically close goals of the form `\integral x in a..b, f x < y` or similar. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 273/0 Mathlib.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/TrapezoidalRule.lean 3 40 ['PMKielstra', 'github-actions', 'tb65536'] kex-y
assignee:kex-y
11-67995
11 days ago
20-74888
20 days ago
20-75330
20 days
26923 oliver-butterley
author:oliver-butterley
feat(Dynamics/BirkhoffSum): add the pointwise ergodic theorem (Birkhoff's) The Pointwise Ergodic Theorem, also known as Birkhoff's Ergodic Theorem. Co-authored-by: Lua Viana Reis - [x] depends on: #26074 - [x] depends on: #26807 - [x] depends on: #26810 - [x] depends on: #26840 - [x] depends on: #26842 - [x] depends on: #26848 - [x] depends on: #26851 - [x] depends on: #26852 - [x] depends on: #26853 - [x] depends on: #27008 - [x] depends on: #28901 Zulip: [PR thread](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2326923.20The.20pointwise.20ergodic.20theorem.20.28Birkhoff's.29/with/527835158) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-dynamics 401/0 Mathlib.lean,Mathlib/Dynamics/BirkhoffSum/Pointwise.lean 2 7 ['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] urkud
assignee:urkud
10-67987
10 days ago
22-54341
22 days ago
29-23814
29 days
29362 stepanholub
author:stepanholub
Periods of lists and the Periodicity Lemma Period of a word (List) is defined and a proof of the Periodicity Lemma (aka Fine-Wilf Theorem) is provided. Fine-Wilf is the basic fact about a word having two periods. --- t-data new-contributor 223/0 Mathlib.lean,Mathlib/Data/List/PeriodicityLemma.lean 2 99 ['Timeroot', 'github-actions', 'madvorak', 'plp127', 'stepanholub'] nobody
10-17328
10 days ago
12-37499
12 days ago
12-37541
12 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/) t-data new-contributor 31/0 Mathlib.lean,Mathlib/Data/PNat/Order.lean 2 14 ['Ruben-VandeVelde', 'eric-wieser', 'github-actions', 'jburroni', 'vihdzp'] ericrbg
assignee:ericrbg
9-7461
9 days ago
9-12465
9 days ago
79-14779
79 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$
69/3 Mathlib/LinearAlgebra/Projectivization/Subspace.lean 1 5 ['eric-wieser', 'gasparattila', 'github-actions'] Vierkantor
assignee:Vierkantor
8-6563
8 days ago
70-85593
2 months ago
70-85638
70 days
29504 zhuyizheng
author:zhuyizheng
feat(MeasureTheory): add absolutely continuous functions Add absolutely continuous functions. Part of originally planned #29092. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 375/0 Mathlib.lean,Mathlib/MeasureTheory/Function/AbsolutelyContinuous.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean 3 1 ['github-actions'] nobody
7-12523
7 days ago
7-12523
7 days ago
7-19363
7 days
29057 jeremypparker
author:jeremypparker
feat(Topology/Instances): `AddCircle.liftIoc_continuous` Previously `AddCircle.liftIco_continuous` existed but this equivalent result did not. In the process I prove that `liftIoc` is equivalent to `liftIco` if the endpoint values are equal. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-topology 50/5 Mathlib/Topology/Instances/AddCircle/Defs.lean 1 8 ['Ruben-VandeVelde', 'github-actions', 'jeremypparker'] ADedecker
assignee:ADedecker
6-83833
6 days ago
20-30118
20 days ago
20-30154
20 days
29503 zhuyizheng
author:zhuyizheng
feat(MeasureTheory): add Lebesgue differentiation theorem for intervals Add the Lebesgue differentiation theorem for intervals. Part of originally planned #29092. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 77/0 Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/LebesgueDifferetiationThm.lean 3 19 ['github-actions', 'themathqueen', 'vlad902'] nobody
6-50919
6 days ago
7-12541
7 days ago
7-19825
7 days
26785 TOMILO87
author:TOMILO87
feat: beta distribution Add the Beta distribution to the probability distributions in mathlib4 This PR introduces the Beta distribution on the reals. Main definitions: - betaPDFReal (α β x : ℝ) — the probability density function as a real-valued function - betaPDF (α β x : ℝ) — the pdf as a ℝ≥0∞-valued function - betaMeasure (α β : ℝ) — the probability measure associated with the Beta distribution Main results: - lintegral_betaPDF_eq_one — proof that the pdf integrates to 1 (normalization) - Lemmas on positivity, measurability, and integrability of the pdf - isProbabilityMeasureBeta — the Beta measure is a probability measure Notes: - Follows the general structure of other distributions in mathlib (e.g. Gamma). - Several unused helper lemmas were removed, and proofs streamlined in response to reviewer feedback. - Thanks to @EtienneC30 and @RemyDegenne for detailed reviews across multiple rounds. 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). new-contributor t-measure-probability 206/2 Mathlib.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Probability/Distributions/Beta.lean 4 34 ['EtienneC30', 'RemyDegenne', 'TOMILO87', 'github-actions'] EtienneC30
assignee:EtienneC30
6-3976
6 days ago
32-33357
1 month ago
63-46108
63 days
28818 NotWearingPants
author:NotWearingPants
feat(Data/Setoid/Basic): add theorems about lifting a function to its kernel Currently `ker_lift_injective` and `quotientKerEquivOfRightInverse` lift `f` to `ker f` in their definition. This PR makes this function available as `Setoid.ker_lift f` and adds a few more theorems about it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor easy 28/13 Counterexamples/AharoniKorman.lean,Mathlib/Data/Setoid/Basic.lean 2 3 ['NotWearingPants', 'github-actions', 'mathlib4-merge-conflict-bot'] nobody
5-5035
5 days ago
5-5087
5 days ago
23-20030
23 days
28061 CoolRmal
author:CoolRmal
feat(MeasureTheory): Uniqueness of Measures in the Riesz–Markov–Kakutani Representation Theorem This PR adds the proof of the uniqueness of measures in the Riesz–Markov–Kakutani representation theorem (i.e. if two regular measures on a locally compact Hausdorff space induce the same linear functionals on the set of compactly supported continuous functions, then these two measures are equal). cf. https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Uniqueness.20in.20Riesz.E2.80.93Markov.E2.80.93Kakutani.20representation.20theorem --- - [ ] depends on: #28059 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-measure-probability 182/0 Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/NNReal.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/Topology/UrysohnsLemma.lean 4 12 ['CoolRmal', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] RemyDegenne
assignee:RemyDegenne
4-68006
4 days ago
11-70751
11 days ago
11-76322
11 days
29361 FlAmmmmING
author:FlAmmmmING
feat(RingTheory/PowerSeries/Catalan.lean) We introduce the Catalan generating function as a formal power series over `ℕ`. ## Main Definitions * `PowerSeries.catalanSeries`: The Catalan generating function as a power series. ## Main Results * `PowerSeries.sum_coeff_X_catalanSeries`: When `n` is a natural number, each term in the sum `coeff i X * catalan (n - i)` is 0 except for `i = 1`. * `PowerSeries.coeff_X_mul_catalanSeries`: The coefficient of `X * catalanSeries` at `X^n` is `catalan (n - 1)` when `n > 0`. * `PowerSeries.catalanSeries_one_add_X_mul_self_sq`: The Catalan generating function satisfies the equation `catalanSeries = 1 + X * catalanSeries ^ 2`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory new-contributor 89/0 Mathlib.lean,Mathlib/RingTheory/PowerSeries/Catalan.lean 2 2 ['github-actions', 'wwylele'] kbuzzard
assignee:kbuzzard
4-68002
4 days ago
12-40665
12 days ago
12-40700
12 days
29278 Jlh18
author:Jlh18
feat: groupoid instance on quotient category Show that `CategoryTheory.Quotient` constructs a groupoid when the original category was a groupoid. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import new-contributor t-category-theory 30/0 Mathlib/CategoryTheory/Quotient.lean 1 5 ['Jlh18', 'github-actions', 'joelriou', 'riccardobrasca'] riccardobrasca
assignee:riccardobrasca
4-25912
4 days ago
5-80042
5 days ago
14-27069
14 days
28477 yapudpill
author:yapudpill
feat(RingTheory): golf `IsPrincipalIdealRing.of_prime` In complement to #28451 and as discussed in #27200, this PR uses the newly added Oka predicates to golf the proof of `IsPrincipalIdealRing.of_prime`. --- - [x] depends on: #28525 - [x] depends on: #29567 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory new-contributor 53/55 Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/PrincipalIdealDomainOfPrime.lean 2 11 ['Ruben-VandeVelde', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'yapudpill'] nobody
4-8289
4 days ago
4-71278
4 days ago
10-61594
10 days
29253 FernandoChu
author:FernandoChu
feat(CategoryTheory): (Co)limits in preorders Characterize (co)limits in preorders as glbs/lubs, plus some other instances. new-contributor t-category-theory 151/13 Mathlib/CategoryTheory/Discrete/Basic.lean,Mathlib/CategoryTheory/Limits/Preorder.lean 2 10 ['FernandoChu', 'github-actions', 'joelriou'] joelriou
assignee:joelriou
2-40381
2 days ago
2-44528
2 days ago
13-38837
13 days
29646 jessealama
author:jessealama
feat(Algebra/Homology): add Euler characteristic definition for chain complexes This PR adds a definition of the Euler characteristic for chain complexes. The definition computes the Euler characteristic up to index n as the alternating sum ∑_{k=0}^n (-1)^k rank(C_k). It works over any ring R (using `Module.finrank`). I'm interested in feedback on whether this is the right level of generality and whether the parameterization by index `n` is the preferred approach. This definition is extracted from work on PR #29639 (Euler's polyhedron formula). This is a minimal PR containing only the definition - I thought it might be useful to discuss the design before adding lemmas and theorems. new-contributor t-algebra
label:t-algebra$
73/0 Mathlib.lean,Mathlib/Algebra/Homology/EulerCharacteristic.lean 2 9 ['github-actions', 'jessealama', 'joelriou'] nobody
2-40326
2 days ago
2-81394
2 days ago
3-4337
3 days
29652 fmortimore
author:fmortimore
feat(Order): the Bourbaki–Witt theorem We prove the Bourbaki-Witt theorem, one of Wiedijk's 1000+ theorems --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-order 228/0 Mathlib.lean,Mathlib/Order/BourbakiWitt.lean 2 5 ['eric-wieser', 'fmortimore', 'github-actions'] nobody
2-39797
2 days ago
2-79913
2 days ago
2-79949
2 days
29679 Jlh18
author:Jlh18
fix: attributes to_app and reassoc In `../Pseudofunctor`, - the parallel attributes `@[reassoc, to_app]` fail to generate the useful lemmas `..._app_assoc`. These have been replaced with the attribute `@[to_app (attr:=reassoc)]` - there were several usages of `@[reassoc]` on lemmas `f = ...` where `f` is not a composition. This generates a useless lemma. These have been removed. In `../NaturalTransformation/Pseudo`, - there are again some usages of `@[reassoc]` on lemmas `f = ...` where `f` is not a composition. These have been removed. - there was no `@[to_app]` on `naturality_comp_inv`, but there was for `naturality_comp_hom`, so I added it. Related zulip posts: [#mathlib4 > reassoc and simp](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/reassoc.20and.20simp/with/449403172) By the way, for `../NaturalTransformation/Pseudo`, - I'm also not sure whether ```lean4 @[reassoc (attr := simp), to_app] theorem whiskerLeft_naturality_naturality (f : a' ⟶ G.obj a) {g h : a ⟶ b} (β : g ⟶ h) : f ◁ G.map₂ β ▷ θ.app b ≫ f ◁ (θ.naturality h).hom = f ◁ (θ.naturality g).hom ≫ f ◁ θ.app a ◁ H.map₂ β := θ.toOplax.whiskerLeft_naturality_naturality _ _ ``` really is the behaviour that we want. I am not changing it because I am unsure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-category-theory 17/17 Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean 2 1 ['github-actions'] nobody
2-13154
2 days ago
2-13724
2 days ago
2-13765
2 days
27982 ShreckYe
author:ShreckYe
chore(Data/Nat/GCD): use `Nat.Prime.dvd_or_dvd` from #27981 in `Nat.Prime.dvd_or_dvd_of_dvd_lcm` from #27963 to simplify the proof a bit - [ ] depends on: #27963 - [ ] depends on: #27981 new-contributor 1/1 Mathlib/Data/Nat/GCD/Prime.lean 1 3 ['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] nobody
1-59056
1 day ago
1-59063
1 day ago
1-69837
1 day
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 391/68 Mathlib.lean,Mathlib/CategoryTheory/Closed/PowerObjects.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Equalizer.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Topos/Classifier.lean 9 13 ['fweth', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot'] riccardobrasca
assignee:riccardobrasca
1-40510
1 day ago
10-18763
10 days ago
29-77329
29 days
29110 NotWearingPants
author:NotWearingPants
feat(Counterexamples): Euler's sum of powers conjecture feat(Counterexamples): Euler's sum of powers conjecture --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor 158/0 Counterexamples.lean,Counterexamples/EulerSumOfPowers.lean 2 40 ['MichaelStollBayreuth', 'NotWearingPants', 'eric-wieser', 'github-actions', 'tb65536'] MichaelStollBayreuth
assignee:MichaelStollBayreuth
1-34379
1 day ago
1-72755
1 day ago
15-25624
15 days
28967 utkuokur
author:utkuokur
refactor(Combinatorics/SimpleGraph/Walk): simplify proof of "support_tail_of_not_nil" The proof of the lemma named "support_tail_of_not_nil" is shortened. Since "support_tail" is not needed anymore, it is removed. @[deprecated (since := "2025-08-26")] sign is added for the removed "support_tail". The library references to "support_tail" are replaced with "support_tail_of_not_nil". To keep [@simp] on "cons_support_tail" and avoid the linter error, the [@simp] of "support_tail_of_not_nil" (previously on "support_tail") is removed. There might be a better way that I am missing, to deal with the linter error. --- Additionally, a merge conflict with `master` was resolved by keeping the generalized `support_tail_of_not_nil` and reintroducing `support_tail` as a deprecated alias for compatibility. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-combinatorics 7/10 Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean 2 3 ['github-actions', 'mathlib4-merge-conflict-bot', 'themathqueen'] awainverse
assignee:awainverse
0-80371
22 hours ago
8-83128
8 days ago
22-12644
22 days
29477 izanbf1803
author:izanbf1803
feat(Algebra/Ring/Invertible): add `eq_of_invOf_add_eq_invOf_add_invOf` Formalize statement and prove eq_of_invOf_add_eq_invOf_add_invOf ⅟(a + b) = ⅟a + ⅟b → a * ⅟b * a = b * ⅟a * b (for a, b in a ring; a, b invertible) This will be useful to formalize a proof in https://github.com/eric-wieser/lean-matrix-cookbook. new-contributor t-algebra
label:t-algebra$
28/0 Mathlib/Algebra/Ring/Invertible.lean 1 8 ['eric-wieser', 'github-actions', 'izanbf1803'] ocfnash
assignee:ocfnash
0-67994
18 hours ago
8-5259
8 days ago
8-5304
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. --- - [x] depends on: #27221 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge new-contributor t-analysis 466/0 Mathlib.lean,Mathlib/Analysis/Normed/Affine/AsymptoticCone.lean,Mathlib/Order/Filter/Map.lean,Mathlib/Topology/Algebra/AsymptoticCone.lean 4 45 ['AntoineChambert-Loir', 'YaelDillies', 'gasparattila', 'github-actions', 'mathlib4-dependent-issues-bot'] YaelDillies
assignee:YaelDillies
0-49535
13 hours ago
43-11428
1 month ago
57-28965
57 days
29318 FernandoChu
author:FernandoChu
feat(CategoryTheory): (Co)limits in skeletons As [suggested in the zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Transporting.20properties.20along.20an.20equivalence.20of.20cats/with/533308058), I add here some instances for (co)limits in the skeletons. This is useful, e.g., for showing that `Subobject X` has arbitrary suprema/infima under some conditions in the underlying category. maintainer-merge new-contributor t-category-theory 77/3 Mathlib.lean,Mathlib/CategoryTheory/Limits/Skeleton.lean,Mathlib/CategoryTheory/Skeletal.lean 3 8 ['FernandoChu', 'github-actions', 'robin-carlier'] robin-carlier
assignee:robin-carlier
0-44588
12 hours ago
0-44588
12 hours ago
14-18011
14 days
28119 JasperMS
author:JasperMS
feat(Data/Set/Pairwise): prove pairwise results for Chains, move `Set.pairwise_iUnion₂` Initiate a new file `Data/Set/Pairwise/Chain.lean` which makes some `Pairwise` results available to the `IsChain` predicate. In the process, move `Set.pairwise_iUnion₂` to group it with similar results. Perform some variable harmonization. Part of Carleson, original result by Edward van de Meent. Moves: - Set.pairwise_iUnion₂: from Data.Set.Lattice to Data.Set.Pairwise.Lattice --- This PR was discussed and advice was given in [#mathlib4 > Novice questions on style and structure](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Novice.20questions.20on.20style.20and.20structure/with/533462814). Many thanks to those who helped me out! Mathlib PRs are still new to me, so please point out where I can improve! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) carleson t-data new-contributor 56/12 Mathlib.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/Data/Set/Pairwise/Chain.lean,Mathlib/Data/Set/Pairwise/Lattice.lean 4 11 ['JasperMS', 'Ruben-VandeVelde', 'edegeltje', 'github-actions'] nobody
0-29029
8 hours ago
40-20785
1 month ago
40-21225
40 days
29437 NotWearingPants
author:NotWearingPants
feat(Data/Seq): add Seq.subsequence and prove basic theorems about it I added `Seq.subsequence` to compose a sequence with a monotone function, creating a subsequence. Aliased to `Seq.comp` since it's a composition. I also added `Nat.le_induction_step_iff` which is needed to prove a subsequence is a sequence. This proves the comment at the top of `Defs.lean` that says "if `f n = none`, then `f m = none` for all `m ≥ n`" while `IsSeq` only talks about `n+1`. For completion I added the same statement for `Int`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) large-import t-data new-contributor 114/0 Mathlib/Data/Int/Init.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/Data/Seq/Defs.lean 4 2 ['github-actions', 'mathlib4-merge-conflict-bot'] nobody
0-28779
7 hours ago
0-28800
7 hours ago
9-16294
9 days
26089 WilliamCoram
author:WilliamCoram
feat: restricted power series form a ring We define restricted power series over a normed ring R, and show they form a ring when R has the ultrametric property This is an update of [#23338](https://github.com/leanprover-community/mathlib4/pull/23338) to meet new expectations of PRs from forks. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) new-contributor t-algebra t-number-theory
label:t-algebra$
141/0 Mathlib.lean,Mathlib/RingTheory/PowerSeries/Restricted.lean 2 30 ['CBirkbeck', 'WilliamCoram', 'github-actions', 'riccardobrasca'] riccardobrasca
assignee:riccardobrasca
0-20542
5 hours ago
0-31533
8 hours ago
77-13614
77 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$
105/0 Mathlib.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Nilpotent/Defs.lean,Mathlib/RingTheory/Nilpotent/GeometricallyReduced.lean,Mathlib/RingTheory/TensorProduct/Basic.lean 5 61 ['dleijnse', 'github-actions', 'joelriou', 'kckennylau'] joelriou
assignee:joelriou
0-15990
4 hours ago
6-44134
6 days ago
53-23790
53 days
29713 jessealama
author:jessealama
feat (Algebra/Homology): add Euler-Poincaré formula This PR adds the Euler characteristic for chain complexes and proves the Euler-Poincaré formula relating the alternating sum of chain dimensions to the alternating sum of homology dimensions. ### Main definitions (in `EulerCharacteristic.lean`) * `ChainComplex.signZ`: The alternating sign function for ℤ-indexed complexes * `ChainComplex.boundedEulerCharZ`: The Euler characteristic over a finite set * `ChainComplex.eulerChar`: The Euler characteristic as an infinite sum * `ChainComplex.homologyBoundedEulerCharZ`: The homological Euler characteristic over a finite set * `ChainComplex.homologyEulerChar`: The homological Euler characteristic as an infinite sum All definitions work with ℤ-indexed complexes and take a reference point parameter to determine where the alternating sign pattern starts. ### Main results (in `EulerPoincare.lean`) * `ChainComplex.eulerChar_eq_homology_eulerChar`: For ℤ-indexed bounded chain complexes of finite-dimensional vector spaces that vanish outside a finite interval [a,b], the alternating sum of dimensions equals the alternating sum of homology dimensions ### Supporting lemmas The proof includes several supporting lemmas: * Interval splitting lemmas for telescoping sums * Dimension decomposition lemmas using the rank-nullity theorem * Lemmas about vanishing differentials at boundaries * A general telescoping sum lemma for alternating sums This is part of a series of PRs building toward a formalization of Euler's polyhedron formula (Wiedijk #13). --- * depends on: (none) * related to: #29639, #29643, #29646 new-contributor t-algebra
label:t-algebra$
471/0 Mathlib.lean,Mathlib/Algebra/Homology/EulerCharacteristic.lean,Mathlib/Algebra/Homology/EulerPoincare.lean 3 17 ['github-actions', 'jessealama', 'joelriou', 'kim-em'] nobody
0-13968
3 hours ago
0-20385
5 hours ago
1-30239
1 day
26129 LessnessRandomness
author:LessnessRandomness
feat(Geometry/Euclidean/Angle/Unoriented): triangle inequality for angles This PR continues the work from #24206. Original PR: https://github.com/leanprover-community/mathlib4/pull/24206 new-contributor t-euclidean-geometry 203/16 Mathlib.lean,Mathlib/Analysis/Fourier/FiniteAbelian/Orthogonality.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/TriangleInequality.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean 8 76 ['JovanGerb', 'LessnessRandomness', 'Timeroot', 'github-actions', 'jsm28', 'mathlib4-merge-conflict-bot', 'themathqueen'] jsm28
assignee:jsm28
0-9616
2 hours ago
12-72733
12 days ago
88-14129
88 days
29532 Aaron1011
author:Aaron1011
feat: add group/field versions of Filter.map_*_atTop_eq_nat Add Filter.map_add_atTop_eq, Filter.map_sub_atTop_eq, and Filter.map_div_atTop_eq, which correspond to Filter.map_add_atTop_eq_nat, Filter.map_sub_atTop_eq_nat, and Filter.map_div_atTop_eq_nat respectively. These theorems apply to ordered groups/fields --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge new-contributor t-order 14/0 Mathlib/Order/Filter/AtTopBot/Archimedean.lean,Mathlib/Order/Filter/AtTopBot/Field.lean 2 2 ['Ruben-VandeVelde', 'github-actions'] nobody
0-5898
1 hour ago
0-5899
1 hour ago
6-65394
6 days

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
27552 Equilibris
author:Equilibris
refactor: make universe levels visible in typevec This will be needed to allow `M.corec` to be generic across universes --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor easy 16/10 Mathlib/Data/TypeVec.lean 1 9 ['Equilibris', 'eric-wieser', 'github-actions', 'plp127'] nobody
35-49134
1 month ago
36-1553
1 month ago
52-14069
52 days
28141 YaelDillies
author:YaelDillies
chore: deprecate `BialgHom.coe_toLinearMap` `BialgHom.toLinearMap` is a fake projection. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-ring-theory toric easy 5/11 Mathlib/RingTheory/Bialgebra/Hom.lean 1 8 ['YaelDillies', 'eric-wieser', 'github-actions'] alreadydone
assignee:alreadydone
31-67971
1 month ago
39-45100
1 month ago
39-45096
39 days
27567 themathqueen
author:themathqueen
feat(LinearAlgebra/TensorProduct/Associator): add `lid` and `assoc` tensor lemmas This adds `TensorProduct.lid_tensor` and `TensorProduct.assoc_tensor`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra easy
label:t-algebra$
31/2 Mathlib/LinearAlgebra/TensorProduct/Associator.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean 2 3 ['github-actions', 'themathqueen'] mattrobball
assignee:mattrobball
8-13645
8 days ago
38-3168
1 month ago
51-82401
51 days
28818 NotWearingPants
author:NotWearingPants
feat(Data/Setoid/Basic): add theorems about lifting a function to its kernel Currently `ker_lift_injective` and `quotientKerEquivOfRightInverse` lift `f` to `ker f` in their definition. This PR makes this function available as `Setoid.ker_lift f` and adds a few more theorems about it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-data new-contributor easy 28/13 Counterexamples/AharoniKorman.lean,Mathlib/Data/Setoid/Basic.lean 2 3 ['NotWearingPants', 'github-actions', 'mathlib4-merge-conflict-bot'] nobody
5-5035
5 days ago
5-5087
5 days ago
23-20030
23 days
29626 themathqueen
author:themathqueen
chore(Algebra/Order/Module/PositiveLinearMap): generalize `OrderHomClass.ofLinear` Generalize `OrderHomClass.ofLinear` from linear maps to additive group homomorphisms. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) t-algebra easy
label:t-algebra$
10/11 Mathlib/Algebra/Order/Module/PositiveLinearMap.lean,Mathlib/Analysis/CStarAlgebra/CompletelyPositiveMap.lean 2 5 ['Ruben-VandeVelde', 'github-actions', 'themathqueen'] nobody
2-21129
2 days ago
2-21150
2 days ago
3-85907
3 days
29684 grunweg
author:grunweg
chore: golf using subset_rfl Instead of subset_refl _. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) easy 11/14 Mathlib/Analysis/LocallyConvex/BalancedCoreHull.lean,Mathlib/Data/Fintype/EquivFin.lean,Mathlib/LinearAlgebra/Eigenspace/Triangularizable.lean,Mathlib/MeasureTheory/OuterMeasure/OfFunction.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/NoetherianSpace.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean 8 1 ['github-actions'] nobody
2-2218
2 days ago
2-2347
2 days ago
2-2329
2 days
29678 vihdzp
author:vihdzp
feat: stronger version of `ArchimedeanClass.mk_le_mk` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) maintainer-merge t-order t-algebra easy
label:t-algebra$
7/0 Mathlib/Algebra/Order/Archimedean/Class.lean 1 2 ['Ruben-VandeVelde', 'github-actions', 'wwylele'] nobody
0-8712
2 hours ago
0-8712
2 hours ago
2-13825
2 days

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