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This dashboard was last updated on: October 04, 2025 at 02:38 UTC

Overall statistics

Found 1960 open PRs overall. Among these PRs

397 (20.3%) are awaiting review (these ones), among these 65 (16.4%) by new contributors (these ones)
305 (15.6%) are blocked on another PR
189 (9.6%) are awaiting the PR author's action
252 (12.9%) have a merge conflict: among these, 124 (49.2%) would be ready for review otherwise: these
35 (1.8%) are labelled help-wanted or please-adopt (roughly these)
747 (38.1%) are marked as draft or work in progress
16 (0.8%) are awaiting the outcome of a zulip discussion (these ones)
0 (0.0%) have contradictory labels (these ones)
18 (0.9%) are delegated (stale ones are here)
1 (0.1%) have been sent to bors (stale ones are here)

Approved, not yet landed PRs

At the moment,

1 PRs are ready to merge — among these no stale ones, congratulations!
24 PRs are waiting on maintainer approval (these), of which 15 have not been updated in a day (these)

26 PRs have been delegated and not updated in a day

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
23600	mattrobball author:mattrobball	perf(Quiver.Basic): make `IsThin` a `class`	It seems problematic that `Quiver.IsThin` is an `abbrev` for (essentially) `Subsingleton`. We turn it in a one-field class. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated	27/21	Mathlib/CategoryTheory/Bicategory/Coherence.lean,Mathlib/CategoryTheory/Category/Preorder.lean,Mathlib/CategoryTheory/Generator/Basic.lean,Mathlib/CategoryTheory/Groupoid/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/WidePullbacks.lean,Mathlib/CategoryTheory/Limits/SmallComplete.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean,Mathlib/CategoryTheory/Thin.lean,Mathlib/Combinatorics/Quiver/Basic.lean	11	16	['b-mehta', 'github-actions', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	168-38410 5 months ago	183-37214 6 months ago	0-5717 1 hour
23213	mattrobball author:mattrobball	chore(RingTheory.Derivation): add a `LinearMapClass` instance	Often we want `simp` to call `map_zero` or `map_add` for a `Derivation`. To find the `ZeroHomClass` or `AddHomClass` instance necessary it starts to climb up the type class hierarchy including looking for a `LinearMapClass` instance which didn't exist. Consequently, sythesis would look in a lot of crazy places trying to summon ring structures on the module or on derivations itself. Here we add the missing `LinearMapClass` instance so that `simp` is more efficient. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	5/3	Mathlib/RingTheory/Derivation/Basic.lean	1	8	['github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	148-15676 4 months ago	148-15676 4 months ago	47-39026 47 days
23214	mattrobball author:mattrobball	perf(Module.LinearMap.Defs): deprioritize projections to parents for `SemilinearMapClass`	Trying to figure out if a given type has a `SemilinearMapClass` instance when all we want is an `AddHomClass` or a `MulActionSemiHomClass` can be quite expensive since there are multiple ways to crawl the algebraic hierarchy to generate `LinearMapClass` instances. If these fail, then they fail slowly. We deprioritize the projections from `SemilinearMapClass` to `AddHomClass` and `MulActionSemiHomClass` to make this one of the last choices. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	6/0	Mathlib/Algebra/Module/LinearMap/Defs.lean	1	6	['github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	148-15442 4 months ago	148-15442 4 months ago	47-32152 47 days
23137	grunweg author:grunweg	chore(Topology): some more fun_prop tagging	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology delegated	8/4	Mathlib/Dynamics/Flow.lean,Mathlib/Topology/Algebra/Monoid.lean	2	10	['github-actions', 'grunweg', 'j-loreaux', 'mathlib-bors']	nobody	147-17891 4 months ago	147-17891 4 months ago	34-32727 34 days
25473	adomani author:adomani	feat(CI): check that Mathlib files have lean or md extension	Twice recently there have been files with an "intended" `.lean` extension in `Mathlib/`: * #24942, ending in `;lean`; * #25457, ending in `.Lean`. `mk_all` does not add these files to `Mathlib.lean`, since they do not end in `.lean` and this later causes problems. This CI step checks that all files in `Mathlib/` end with `.lean` or `.md`. See #25474 for a test where the new step [correctly fails](https://github.com/leanprover-community/mathlib4/actions/runs/15464097783/job/43532018379?pr=25474). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI delegated	10/0	.github/workflows/lint_and_suggest_pr.yml	1	10	['adomani', 'bryangingechen', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	120-49465 3 months ago	120-50355 3 months ago	0-11212 3 hours
25765	JovanGerb author:JovanGerb	feat(gcongr): lemma for rewriting inside divisibility	TODO: add test to show that we can rewrite using `a ≡ b [ZMOD n]` inside `n ∣ 2 * a + 1`. edit: it's not yet entirely clear if this is the right thing to do. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data delegated	5/0	Mathlib/Data/Int/ModEq.lean	1	3	['fpvandoorn', 'github-actions', 'mathlib-bors']	nobody	112-7902 3 months ago	112-43440 3 months ago	1-19951 1 day
22366	kim-em author:kim-em	feat: `check_equalities` tactic for diagnosing defeq problems	The `check_equalities` tactic, which checks the typing of equalities in the goal, reporting discrepancies between the implicit type argument of the equality, and the inferred types of the left and right hand sides, at "instances and reducible" transparency. Reports from this tactic do not necessarily indicate a problem, although typically `simp` should reduce rather than increase the reported discrepancies. `check_equalities` may be useful in diagnosing uses of `erw`.	t-meta delegated	118/3	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/CategoryTheory/CheckCompositions.lean,Mathlib/Tactic/CheckEqualities.lean,Mathlib/Tactic/Common.lean,MathlibTest/check_equalities.lean	7	16	['adomani', 'b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'kim-em', 'mathlib-bors']	nobody	63-48709 2 months ago	203-41278 6 months ago	15-14325 15 days
25481	kbuzzard author:kbuzzard	chore: refactor Algebra.TensorProduct.rightAlgebra	The declaration `Algebra.TensorProduct.rightAlgebra` makes `A ⊗[R] B` into a `B`-algebra (here `R` is a `CommSemiring`, `A` is a `Semiring` and an `R`-algebra, and `B` is a `CommSemiring` and an `R`-algebra). It is not an instance because if A = B it causes a diamond. However in the many cases where A isn't B, it can occasionally be useful. However one could imagine that in the many cases where an R-module `M` also isn't `B`, it might occasionally be useful to make `M ⊗[R] B` into a `B`-module (and indeed I am finding this in FLT). With the current definition of `Algebra.TensorProduct.rightAlgebra` this is difficult to do without causing diamonds in the case when `M` happens to be an `R`-algebra (by which I mean "I failed to do this in finite time"). One fix for this is just to redefine `Algebra.TensorProduct.rightAlgebra` so that the `smul` field is ``` smul b ab := TensorProduct.comm _ _ _ (b • (TensorProduct.comm _ _ _ ab)) ``` i.e. literally "swap the product around, use mathlib's instance making `B ⊗[R] A` into a `B`-algebra, and then swap back". Then the same definition can be used to make `M ⊗[R] B` into a `B`-module and on the odd occasion where this point of view is useful, there is no diamond. This is what we do in this PR. After adding one simp lemma there is no breakage at all in mathlib. Furthermore, for those who have observed that we want to build on this algebra instance sometimes and, for example, add instances of the form "if M is finite over R then M ⊗[R] B is finite over B" -- these instances are really easy to add now with this new definition, because you simply pull back the analogous finite left module instance along the isomorphism M ⊗[R] B = B ⊗[R] M. Examples (from FLT, where the right action is put in a scope): ``` scoped instance [Module.Finite R M] : Module.Finite A (M ⊗[R] A) := Module.Finite.equiv (Module.TensorProduct.comm R A M) scoped instance [Module.Free R M] : Module.Free A (M ⊗[R] A) := Module.Free.of_equiv (Module.TensorProduct.comm R A M) ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	33/6	Mathlib/RingTheory/TensorProduct/Basic.lean	1	7	['adomani', 'github-actions', 'kbuzzard', 'leanprover-bot', 'mathlib-bors']	adomani assignee:adomani	63-40902 2 months ago	63-48031 2 months ago	56-85445 56 days
23669	erdOne author:erdOne	feat(FieldTheory): abelian extensions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	74/0	Mathlib.lean,Mathlib/FieldTheory/Galois/Abelian.lean,Mathlib/NumberTheory/Cyclotomic/Gal.lean	3	16	['acmepjz', 'alreadydone', 'chrisflav', 'erdOne', 'github-actions', 'mathlib-bors', 'riccardobrasca', 'xroblot']	riccardobrasca assignee:riccardobrasca	58-48886 1 month ago	87-53126 2 months ago	29-68817 29 days
27180	ADedecker author:ADedecker	feat: quotient of a monoid with zero by a multiplicative congruence	--- My motivation is getting a more conceptual construction of [ValuativeRel.ValueGroupWithZero](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Valuation/ValuativeRel.html#ValuativeRel.ValueGroupWithZero), but I think this is of independent interest. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	141/26	Mathlib.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/GroupWithZero.lean	5	31	['ADedecker', 'eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	ocfnash assignee:ocfnash	51-49485 1 month ago	51-62693 1 month ago	28-12053 28 days
25500	eric-wieser author:eric-wieser	feat: delaborators for metadata	Being able to see these is very important when debugging tactic failures. Probably these could be upstreamed, but I don't think that's a reason not to merge them here first. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta delegated awaiting-author	75/3	Mathlib/Util/Delaborators.lean,Mathlib/Util/PPOptions.lean,MathlibTest/delaborators.lean	3	18	['JovanGerb', 'Rob23oba', 'eric-wieser', 'github-actions', 'kmill', 'mathlib-bors', 'plp127']	alexjbest assignee:alexjbest	36-34017 1 month ago	36-34899 1 month ago	83-71907 83 days
26370	b-mehta author:b-mehta	chore(Archive): golf and generalise ascending-descending sequences	This proof was 5 years old, not in a good generality, and overly long. We fix the latter two points. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data delegated	96/120	Archive/Wiedijk100Theorems/AscendingDescendingSequences.lean	1	13	['b-mehta', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-bors']	ericrbg assignee:ericrbg	22-32461 22 days ago	22-32461 22 days ago	78-81111 78 days
29047	grunweg author:grunweg	chore(1000.yaml): add Fourier's theorem	Mathlib has some form of it already; while there is space for more advanced versions, let's surface the current progress already. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated	5/1	docs/1000.yaml	1	6	['Ruben-VandeVelde', 'bryangingechen', 'github-actions', 'mathlib-bors', 'mcdoll', 'riccardobrasca']	nobody	13-53319 13 days ago	36-48796 1 month ago	0-17788 4 hours
28260	euprunin author:euprunin	chore(Analysis/Fourier): golf entire `fourier_zero` and `fourier_zero'` using `simp`	--- Show trace profiling of `fourier_zero` ### Trace profiling of `fourier_zero` before PR 28260 ```diff diff --git a/Mathlib/Analysis/Fourier/AddCircle.lean b/Mathlib/Analysis/Fourier/AddCircle.lean index 6238f58476..99dbb05621 100644 --- a/Mathlib/Analysis/Fourier/AddCircle.lean +++ b/Mathlib/Analysis/Fourier/AddCircle.lean @@ -126,2 +126,3 @@ theorem fourier_coe_apply' {n : ℤ} {x : ℝ} : -- simp normal form is `fourier_zero'` +set_option trace.profiler true in theorem fourier_zero {x : AddCircle T} : fourier 0 x = 1 := by ``` ``` ℹ [2482/2482] Built Mathlib.Analysis.Fourier.AddCircle info: Mathlib/Analysis/Fourier/AddCircle.lean:128:0: [Elab.async] [0.066690] elaborating proof of fourier_zero [Elab.definition.value] [0.066228] fourier_zero [Elab.step] [0.065930] induction x using QuotientAddGroup.induction_on simp only [fourier_coe_apply] norm_num [Elab.step] [0.065922] induction x using QuotientAddGroup.induction_on simp only [fourier_coe_apply] norm_num [Elab.step] [0.055636] simp only [fourier_coe_apply] Build completed successfully. ``` ### Trace profiling of `fourier_zero` after PR 28260 ```diff diff --git a/Mathlib/Analysis/Fourier/AddCircle.lean b/Mathlib/Analysis/Fourier/AddCircle.lean index 6238f58476..0542519008 100644 --- a/Mathlib/Analysis/Fourier/AddCircle.lean +++ b/Mathlib/Analysis/Fourier/AddCircle.lean @@ -126,10 +126,8 @@ theorem fourier_coe_apply' {n : ℤ} {x : ℝ} : -- simp normal form is `fourier_zero'` +set_option trace.profiler true in theorem fourier_zero {x : AddCircle T} : fourier 0 x = 1 := by - induction x using QuotientAddGroup.induction_on - simp only [fourier_coe_apply] - norm_num + simp -theorem fourier_zero' {x : AddCircle T} : @toCircle T 0 = (1 : ℂ) := by - have : fourier 0 x = @toCircle T 0 := by rw [fourier_apply, zero_smul] - rw [← this]; exact fourier_zero +theorem fourier_zero' : @toCircle T 0 = (1 : ℂ) := by + simp ``` ``` ℹ [2482/2482] Built Mathlib.Analysis.Fourier.AddCircle info: Mathlib/Analysis/Fourier/AddCircle.lean:128:0: [Elab.async] [0.041217] elaborating proof of fourier_zero [Elab.definition.value] [0.040843] fourier_zero [Elab.step] [0.040316] simp [Elab.step] [0.040305] simp [Elab.step] [0.040291] simp [Meta.isDefEq] [0.013042] ✅️ 0 • ?m =?= 0 • x [Meta.isDefEq] [0.010734] ✅️ instHSMul =?= instHSMul [Meta.isDefEq.delta] [0.010705] ✅️ instHSMul =?= instHSMul [Meta.synthInstance] [0.010613] ✅️ SMulWithZero ℤ (AddCircle T) [Meta.synthInstance] [0.010175] ✅️ apply @AddGroup.intSMulWithZero to SMulWithZero ℤ (AddCircle T) [Meta.synthInstance.tryResolve] [0.010141] ✅️ SMulWithZero ℤ (AddCircle T) ≟ SMulWithZero ℤ (AddCircle T) [Meta.isDefEq] [0.010882] ❌️ ↑1 =?= ↑1 Build completed successfully. ``` --- Show trace profiling of `fourier_zero'` ### Trace profiling of `fourier_zero'` before PR 28260 ```diff diff --git a/Mathlib/Analysis/Fourier/AddCircle.lean b/Mathlib/Analysis/Fourier/AddCircle.lean index 6238f58476..c97c6382dd 100644 --- a/Mathlib/Analysis/Fourier/AddCircle.lean +++ b/Mathlib/Analysis/Fourier/AddCircle.lean @@ -131,2 +131,3 @@ theorem fourier_zero {x : AddCircle T} : fourier 0 x = 1 := by +set_option trace.profiler true in theorem fourier_zero' {x : AddCircle T} : @toCircle T 0 = (1 : ℂ) := by ``` ``` ℹ [2482/2482] Built Mathlib.Analysis.Fourier.AddCircle info: Mathlib/Analysis/Fourier/AddCircle.lean:133:0: [Elab.command] [0.040228] theorem fourier_zero' {x : AddCircle T} : @toCircle T 0 = (1 : ℂ) := by have : fourier 0 x = @toCircle T 0 := by rw [fourier_apply, zero_smul] rw [← this]; exact fourier_zero [Elab.definition.header] [0.039678] fourier_zero' [Elab.step] [0.039292] expected type: Sort ?u.10460, term @toCircle T 0 = (1 : ℂ) [Elab.step] [0.039281] expected type: Sort ?u.10460, term binrel% Eq✝ (@toCircle T 0) (1 : ℂ) [Meta.synthInstance] [0.023079] ❌️ CoeT ℂ x Circle info: Mathlib/Analysis/Fourier/AddCircle.lean:133:0: [Elab.async] [0.050645] elaborating proof of fourier_zero' [Elab.definition.value] [0.049639] fourier_zero' [Elab.step] [0.049079] have : fourier 0 x = @toCircle T 0 := by rw [fourier_apply, zero_smul] rw [← this]; exact fourier_zero [Elab.step] [0.049067] have : fourier 0 x = @toCircle T 0 := by rw [fourier_apply, zero_smul] rw [← this]; exact fourier_zero [Elab.step] [0.047714] have : fourier 0 x = @toCircle T 0 := by rw [fourier_apply, zero_smul] [Elab.step] [0.047690] focus refine no_implicit_lambda% (have : fourier 0 x = @toCircle T 0 := ?body✝; ?_) case body✝ => with_annotate_state"by" (rw [fourier_apply, zero_smul]) [Elab.step] [0.047680] refine no_implicit_lambda% (have : fourier 0 x = @toCircle T 0 := ?body✝; ?_) case body✝ => with_annotate_state"by" (rw [fourier_apply, zero_smul]) [Elab.step] [0.047675] refine no_implicit_lambda% (have : fourier 0 x = @toCircle T 0 := ?body✝; ?_) case body✝ => with_annotate_state"by" (rw [fourier_apply, zero_smul]) [Elab.step] [0.016566] refine no_implicit_lambda% (have : fourier 0 x = @toCircle T 0 := ?body✝; ?_) [Elab.step] [0.016520] expected type: ↑(toCircle 0) = 1, term no_implicit_lambda% (have : fourier 0 x = @toCircle T 0 := ?body✝; ?_) [Elab.step] [0.016512] expected type: ↑(toCircle 0) = 1, term (have : fourier 0 x = @toCircle T 0 := ?body✝; ?_) [Elab.step] [0.016502] expected type: ↑(toCircle 0) = 1, term have : fourier 0 x = @toCircle T 0 := ?body✝; ?_ [Elab.step] [0.016409] expected type: Sort ?u.12245, term fourier 0 x = @toCircle T 0 [Elab.step] [0.016398] expected type: Sort ?u.12245, term binrel% Eq✝ (fourier 0 x) (@toCircle T 0) [Elab.step] [0.031091] case body✝ => with_annotate_state"by" (rw [fourier_apply, zero_smul]) [Elab.step] [0.031024] with_annotate_state"by" (rw [fourier_apply, zero_smul]) [Elab.step] [0.031018] with_annotate_state"by" (rw [fourier_apply, zero_smul]) [Elab.step] [0.031012] with_annotate_state"by" (rw [fourier_apply, zero_smul]) [Elab.step] [0.031006] (rw [fourier_apply, zero_smul]) [Elab.step] [0.031000] rw [fourier_apply, zero_smul] [Elab.step] [0.030995] rw [fourier_apply, zero_smul] [Elab.step] [0.030987] rw [fourier_apply, zero_smul] [Elab.step] [0.030977] (rewrite [fourier_apply, zero_smul]; with_annotate_state"]" (try (with_reducible rfl))) [Elab.step] [0.030972] rewrite [fourier_apply, zero_smul]; with_annotate_state"]" (try (with_reducible rfl)) [Elab.step] [0.030964] rewrite [fourier_apply, zero_smul]; with_annotate_state"]" (try (with_reducible rfl)) [Elab.step] [0.026599] rewrite [fourier_apply, zero_smul] [Meta.isDefEq] [0.016855] ✅️ 0 • x =?= 0 • ?m [Meta.isDefEq] [0.015512] ✅️ instHSMul =?= instHSMul [Meta.isDefEq.delta] [0.015494] ✅️ instHSMul =?= instHSMul [Meta.synthInstance] [0.015404] ✅️ SMulWithZero ℤ (AddCircle T) [Meta.synthInstance] [0.014948] ✅️ apply @AddGroup.intSMulWithZero to SMulWithZero ℤ (AddCircle T) [Meta.synthInstance.tryResolve] [0.014922] ✅️ SMulWithZero ℤ (AddCircle T) ≟ SMulWithZero ℤ (AddCircle T) [Meta.isDefEq] [0.014466] ✅️ SMulWithZero ℤ (AddCircle T) =?= SMulWithZero ℤ ?m.13159 [Meta.synthInstance] [0.010847] ✅️ Zero (AddCircle T) Build completed successfully. ``` ### Trace profiling of `fourier_zero'` after PR 28260 ```diff diff --git a/Mathlib/Analysis/Fourier/AddCircle.lean b/Mathlib/Analysis/Fourier/AddCircle.lean index 6238f58476..f13a398896 100644 --- a/Mathlib/Analysis/Fourier/AddCircle.lean +++ b/Mathlib/Analysis/Fourier/AddCircle.lean @@ -127,9 +127,7 @@ theorem fourier_coe_apply' {n : ℤ} {x : ℝ} : theorem fourier_zero {x : AddCircle T} : fourier 0 x = 1 := by - induction x using QuotientAddGroup.induction_on - simp only [fourier_coe_apply] - norm_num + simp -theorem fourier_zero' {x : AddCircle T} : @toCircle T 0 = (1 : ℂ) := by - have : fourier 0 x = @toCircle T 0 := by rw [fourier_apply, zero_smul] - rw [← this]; exact fourier_zero +set_option trace.profiler true in +theorem fourier_zero' : @toCircle T 0 = (1 : ℂ) := by + simp ``` ``` ℹ [2482/2482] Built Mathlib.Analysis.Fourier.AddCircle info: Mathlib/Analysis/Fourier/AddCircle.lean:131:0: [Elab.command] [0.045555] theorem fourier_zero' : @toCircle T 0 = (1 : ℂ) := by simp [Elab.definition.header] [0.044962] fourier_zero' [Elab.step] [0.044931] expected type: Sort ?u.10311, term @toCircle T 0 = (1 : ℂ) [Elab.step] [0.044920] expected type: Sort ?u.10311, term binrel% Eq✝ (@toCircle T 0) (1 : ℂ) [Meta.synthInstance] [0.031268] ❌️ CoeT ℂ x Circle info: Mathlib/Analysis/Fourier/AddCircle.lean:131:0: [Elab.async] [0.027859] elaborating proof of fourier_zero' [Elab.definition.value] [0.027542] fourier_zero' [Elab.step] [0.027179] simp [Elab.step] [0.027169] simp [Elab.step] [0.027156] simp [Meta.isDefEq] [0.011252] ❌️ ↑1 =?= ↑1 [Meta.isDefEq.delta] [0.010804] ❌️ ↑1 =?= ↑1 [Meta.isDefEq] [0.010774] ❌️ 1 =?= 1 [Meta.isDefEq] [0.010717] ❌️ { x // 0 ≤ x } =?= Circle [Meta.isDefEq] [0.010706] ❌️ { x // 0 ≤ x } =?= ↥(Submonoid.unitSphere ℂ) [Meta.isDefEq] [0.010684] ❌️ fun x ↦ 0 ≤ x =?= fun x ↦ x ∈ Submonoid.unitSphere ℂ [Meta.isDefEq] [0.010675] ❌️ 0 ≤ x =?= x ∈ Submonoid.unitSphere ℂ Build completed successfully. ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis easy delegated	3/6	Mathlib/Analysis/Fourier/AddCircle.lean	1	4	['eric-wieser', 'euprunin', 'github-actions', 'mathlib-bors']	nobody	8-64009 8 days ago	8-64009 8 days ago	0-15279 4 hours
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 delegated	142/2	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramMatrix.lean,Mathlib/MeasureTheory/Function/L2Space.lean	3	42	['EtienneC30', 'eric-wieser', 'github-actions', 'mathlib-bors', 'pfaffelh', 'sgouezel']	hrmacbeth assignee:hrmacbeth	8-61141 8 days ago	8-61141 8 days ago	78-69916 78 days
29855	eric-wieser author:eric-wieser	chore(Data/Finset/Sort): lemmas about `0 : Fin _` and `Fin.last _`	We already had these for `⟨0, ⋯⟩` and `⟨k - 1, ⋯⟩`. Moves: - `Finset.orderEmbOfFin_zero` -> `Finset.orderEmbOfFin_mk_zero` - `Finset.orderEmbOfFin_last` -> `Finset.orderEmbOfFin_mk_last` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-order easy delegated	17/7	Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Data/Finset/Sort.lean	2	4	['eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	nobody	8-57659 8 days ago	8-57659 8 days ago	3-79002 3 days
29798	Cyantain author:Cyantain	feat(FieldTheory/IsIntegrallyClosed): lemma to judge whether an element is integral	In this PR, we proved that an element is integral iff it's root of irreducible polynomial with unit leading coeff, which is an easy way to judge an element is integral or not, such as $\sqrt 5 / 4$, because it's root of $16x^2-5$ with not unit leading coeff, so it's not integral.	new-contributor t-algebra delegated label:t-algebra$	13/0	Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean	1	8	['Ruben-VandeVelde', 'adomani', 'github-actions', 'kckennylau', 'mathlib-bors', 'riccardobrasca']	nobody	8-49705 8 days ago	8-49705 8 days ago	6-29891 6 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 RFC delegated	2/1	Mathlib/Algebra/Order/Ring/Defs.lean	1	32	['Vierkantor', 'YaelDillies', 'alreadydone', 'artie2000', 'erdOne', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib-bors']	erdOne assignee:erdOne	4-45558 4 days ago	4-45558 4 days ago	45-49533 45 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/) - [x] depends on: #29917	t-meta delegated	219/7	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Field.lean,Mathlib/Tactic/FieldSimp.lean,MathlibTest/FieldSimp.lean	5	47	['Vierkantor', 'adomani', 'fpvandoorn', 'github-actions', 'grunweg', 'hrmacbeth', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	grunweg assignee:grunweg	3-50607 3 days ago	3-51802 3 days ago	28-66972 28 days
14712	FR-vdash-bot author:FR-vdash-bot	perf: change instance priority and order about `OfNat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra merge-conflict delegated label:t-algebra$	49/20	Mathlib/Algebra/Group/Nat.lean,Mathlib/Algebra/Group/ZeroOne.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Data/BitVec.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Data/UInt.lean,Mathlib/NumberTheory/ArithmeticFunction.lean	9	24	['FR-vdash-bot', 'MichaelStollBayreuth', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors']	nobody	362-57472 11 months ago	364-80948 11 months ago	20-15089 20 days
19275	eric-wieser author:eric-wieser	fix: if nolint files change, do a full rebuild	Otherwise CI will succeed when removing entries from the file, but fail later when someone changes something unrelated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict delegated	8/0	lakefile.lean	1	20	['YaelDillies', 'adomani', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	182-43816 5 months ago	182-43816 5 months ago	0-214 3 minutes
17129	joneugster author:joneugster	feat(Tactic/Linter): add unicode linter for unicode variant-selectors	Unicode characters can be followed by one of the two "variant-selectors" `\FE0E` (text) or `\FE0F` (emoji). These appear to the user as a single unicode character and they might copy them by accident. For example `✅️` (`\u2705\uFE0F`), `✅` (`\u2705`) and `✅︎` (`\u2705\uFE0E`) are three variants of the "same" unicode character. The one without variant-selector might display as either emoji or not, depending on the user's device and font. Add unicode linter ensuring variant-selector only appear on specified characters and also ensuring these characters always have the correct variant selector to avoid confusions. Everything flagged by this linter can be fixed fully automatically with `lake exe lint-style --fix` or by commenting `bot fix style` on the PR. --- - tracking PR: #16215 ## Zulip discussions: - https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F - https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Lean.20specific.20font ## Related PRs: - leanprover/lean4#5015 added some emoji-variant selectors to Emojis used in `Lean` itself. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict delegated awaiting-author	245/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnicodeLinter.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CongrM.lean,Mathlib/Tactic/Widget/Conv.lean,Mathlib/Tactic/Widget/GCongr.lean,Mathlib/Topology/ContinuousMap/Weierstrass.lean,MathlibTest/LintStyleTextBased.lean	11	25	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant']	nobody	140-37838 4 months ago	140-37840 4 months ago	82-54712 82 days
13483	adomani author:adomani	feat: automatically replace deprecations	This PR introduces `lake exe update_deprecations` that uses the cache to automatically replace deprecated declarations with the corresponding un-deprecated one. The script handles namespacing, replacing a possibly non-fully-qualified, deprecated name with the fully-qualified non-deprecated name. It is also possible to use ```bash lake exe update_deprecations --mods One.Two.Three,Dd.Ee.Ff ``` to limit the scope of the replacements to the modules `One.Two.Three` and `Dd.Ee.Ff`. This is intended to be a first step in automating updates: combining this with a linter that emits appropriate warnings, the functionality of `lake exe update_deprecations` can be extended to perform more complicated updates. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict delegated awaiting-author	306/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/UpdateDeprecations.lean,MathlibTest/UpdateDeprecations.lean,lakefile.lean,scripts/README.md,scripts/update_deprecations.lean	7	16	['YaelDillies', 'adomani', 'github-actions', 'j-loreaux', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib-bors', 'sgouezel']	joneugster assignee:joneugster	115-4727 3 months ago	115-4728 3 months ago	34-82472 34 days
17627	hrmacbeth author:hrmacbeth	feat: universal properties of vector bundle constructions	Characterizations for the smoothness of maps into the total spaces of (1) the direct sum of two vector bundles; (2) the pullback of a vector bundle. This gap in the library was exposed by #17358. --- - [x] depends on: #22804 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict delegated	311/9	Mathlib/Data/Bundle.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Pullback.lean,Mathlib/Topology/FiberBundle/Constructions.lean	4	24	['PatrickMassot', 'github-actions', 'grunweg', 'hrmacbeth', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'sgouezel']	grunweg assignee:grunweg	90-81726 2 months ago	90-81726 2 months ago	91-73632 91 days
26911	JovanGerb author:JovanGerb	chore: fix naming of `mono` and `monotone`	The naming convention says: "We use `_mono` for `a ≤ b → f a ≤ f b` and `_anti` for `a ≤ b → f b ≤ f a`, so we also use `_monotone` for `Monotone f`, `_antitone` for `Antitone f`, `_strictMono` for `StrictMono f`, `_strictAnti` for `StrictAnti f`, etc..." This PR swaps `mono`/`anti` and `monotone`/`antitone` where required so that `monotone` refers to `Monotone`, while `mono` refers to a lemma that might be tagged with `@[gcongr]` This PR does not address - `mul_left_monotone` and `mul_right_monotone` are exactly the wrong way around - `monotone_right`/`mono_right` vs `right_monotone`/`right_mono` - `monotone_arcsin` vs `arcsin_monotone` edit: TODO: `ideal_mono` and friends --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict delegated	238/171	Archive/Imo/Imo1962Q1.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Group/Finset.lean,Mathlib/Algebra/Order/Group/PosPart.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/Degree/CardPowDegree.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Normed/Order/UpperLower.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Combinatorics/SetFamily/Kleitman.lean,Mathlib/Combinatorics/SimpleGraph/Girth.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Lemma.lean,Mathlib/Computability/Ackermann.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/Nat/Choose/Factorization.lean,Mathlib/Data/Real/Pi/Bounds.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Constructions/Polish/Basic.lean,Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean,Mathlib/MeasureTheory/OuterMeasure/Operations.lean,Mathlib/NumberTheory/Bertrand.lean,Mathlib/NumberTheory/FermatPsp.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/Order/Concept.lean,Mathlib/Order/Filter/AtTopBot/Defs.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Heyting/Boundary.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Order/Hom/Set.lean,Mathlib/Order/Interval/Set/Fin.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/UpperLower/Closure.lean,Mathlib/Probability/StrongLaw.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/FractionalIdeal/Basic.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/MetricSpace/Antilipschitz.lean,Mathlib/Topology/MetricSpace/Holder.lean	59	8	['JovanGerb', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace', 'mathlib-bors']	bryangingechen assignee:bryangingechen	84-3041 2 months ago	84-32065 2 months ago	2-60107 2 days
27872	JovanGerb author:JovanGerb	chore(gcongr): clean up imports	This PR removes redundant `gcongr` imports. And when we do import `gcongr`, we now also import the core `@[gcongr]` tags, and also `grw`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict delegated	7/23	Archive/Imo/Imo2019Q4.lean,Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/MvPolynomial/SchwartzZippel.lean,Mathlib/Algebra/Order/BigOperators/Expect.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SimpleGraph/Density.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Basic.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/NumberTheory/FLT/Polynomial.lean,Mathlib/NumberTheory/FermatPsp.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Filter/AtTopBot/Archimedean.lean,Mathlib/Tactic/GCongr/CoreAttrs.lean,Mathlib/Topology/EMetricSpace/Paracompact.lean	21	11	['JovanGerb', 'bryangingechen', 'github-actions', 'grunweg', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	nobody	43-77462 1 month ago	43-77462 1 month ago	4-34325 4 days

Review status

There are currently 397 PRs awaiting review. Among these,

15 are labelled easy (these ones),
2 are addressing technical debt (namely these), and
105 appeared on the review queue within the last two weeks.

On the other hand, 28 PRs are unassigned and have not seen a status change in a week, and 180 PRs are assigned, without recent review activity.

Stale unassigned PRs on the review queue

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Approval(s)	Updated	Last status change	total time in review
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	none	41-41465 1 month ago	41-41621 1 month ago	41-41654 41 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	1	41-5144 1 month ago	42-71632 1 month ago	42-71675 42 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	none	40-69420 1 month ago	40-69430 1 month ago	40-69461 40 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	none	38-18952 1 month ago	68-57795 2 months ago	106-9713 106 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	none	38-18089 1 month ago	41-77798 1 month ago	42-32477 42 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	none	34-67106 1 month ago	37-62353 1 month ago	37-62393 37 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	none	27-38391 27 days ago	27-38422 27 days ago	55-33309 55 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	none	18-60664 18 days ago	18-60672 18 days ago	18-60704 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	none	18-34529 18 days ago	26-3807 26 days ago	26-3784 26 days
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	none	18-20119 18 days ago	18-20134 18 days ago	18-20170 18 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	none	18-5848 18 days ago	18-5866 18 days ago	39-60364 39 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	none	17-47109 17 days ago	17-47587 17 days ago	17-63794 17 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	none	16-53044 16 days ago	16-53065 16 days ago	25-40554 25 days
29756	Ruben-VandeVelde author:Ruben-VandeVelde	feat: Finsupp.comapDomain_surjective	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-data	9/0	Mathlib/Data/Finsupp/Basic.lean	1	1	['github-actions']	nobody	none	16-23772 16 days ago	16-23810 16 days ago	16-23845 16 days
29761	bwangpj author:bwangpj	feat: Chinese Remainder Theorem for `ZMod n`	Define `ZMod.equivPi`, the Chinese Remainder Theorem for `ZMod n`, decomposing it as a product of `ZMod` over its prime power factors. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	22/0	Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/ZMod/QuotientRing.lean	2	8	['Ruben-VandeVelde', 'bwangpj', 'github-actions', 'j-loreaux']	nobody	none	15-14517 15 days ago	15-14517 15 days ago	15-65900 15 days
29744	espottesmith author:espottesmith	feat(Combinatorics): define directed hypergraphs	This PR defines directed hypergraphs: ``` @[ext] structure DiHypergraph (α : Type*) where /-- The vertex set -/ vertexSet : Set α /-- The edge set -/ edgeSet : Set ((Set α) × (Set α)) /-- Each edge is a pair (s, d), where s ⊆ vertexSet and d ⊆ vertexSet -/ edge_src_dst_isSubset_vertexSet' : ∀ ⦃e⦄, e ∈ edgeSet → e.1 ⊆ vertexSet ∧ e.2 ⊆ vertexSet ``` Additional definitions: - tail/head stars and negative/positive stars - some special cases (B-Graph, F-Graph, BF-Graph, and what I'm calling a "non-endless" dihypergraph, where neither the source/tail nor the destination/head are empty) - Vertex and (hyper)edge adjacency - isolated vertices - empty and nonempty dihypergraphs The design employed here is based off of #28613, but this PR does not depend on that one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	391/0	Mathlib.lean,Mathlib/Combinatorics/DiHypergraph/Basic.lean	2	1	['github-actions']	nobody	none	11-48323 11 days ago	16-54856 16 days ago	16-54901 16 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	29/15	Counterexamples/AharoniKorman.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/Topology/Separation/Hausdorff.lean	4	18	['NotWearingPants', 'eric-wieser', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	1	10-8868 10 days ago	21-29352 21 days ago	39-44291 39 days
29920	urkud author:urkud	feat: separable but not second countable LOTS	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	55/0	Counterexamples.lean,Counterexamples/SeparableNotSecondCountable.lean,Mathlib/Data/Prod/Lex.lean	3	1	['github-actions']	nobody	none	10-6413 10 days ago	10-14897 10 days ago	10-14930 10 days
29955	qawbecrdtey author:qawbecrdtey	feat(Data/Set/Subsingleton): added new lemma `Subsingleton.union_subsingleton` along with some trivial code cleanup	--- Added a lemma which implies both sets are subsingleton if their union is subsingleton. ```lean lemma Subsingleton.union_subsingleton (h : (s ∪ t).Subsingleton) : s.Subsingleton ∧ t.Subsingleton ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	9/3	Mathlib/Data/Set/Subsingleton.lean	1	1	['github-actions']	nobody	none	8-86007 8 days ago	8-86020 8 days ago	8-86056 8 days
29947	JaafarTanoukhi author:JaafarTanoukhi	feat(Combinatorics/Digraph): Maps	Ported `SimpleGraph/Maps.lean` to `Digraph/Maps.lean` for future PRs related to issue #[26771](https://github.com/leanprover-community/mathlib4/issues/26771) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	476/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Maps.lean	2	1	['github-actions']	nobody	none	8-62686 8 days ago	9-35789 9 days ago	9-35829 9 days
29526	llllvvuu author:llllvvuu	feat: `Multiset.map f` identifies `f` up to permutation	Motivation: Reason about `Fintype`-indexed families via `Multiset` equality. Example use case 1: ```lean theorem Matrix.IsHermitian.cfc_eigenvalues {d : Type} [Fintype d] [DecidableEq d] {M : Matrix d d 𝕜} (hM : M.IsHermitian) (f : ℝ → ℝ) (hcfc : Matrix.IsHermitian (cfc f M) := cfc_predicate f M) : ∃ (e : d ≃ d), hcfc.eigenvalues = f ∘ hM.eigenvalues ∘ e := by have := hcfc.roots_charpoly_eq_eigenvalues.symm rw [hM.charpoly_cfc_eq f, Polynomial.roots_prod] at this; swap · simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero] simp_rw [Polynomial.roots_X_sub_C, Multiset.bind_singleton] at this have he := (Multiset.compTriple_equivOfMapUnivEq this).comp_eq simp_rw [← Function.comp_def RCLike.ofReal, ← Function.comp_def f, Function.comp_assoc] at he exact ⟨_, RCLike.ofReal_injective.comp_left he.symm⟩ ``` Example use case 2 (on top of https://github.com/leanprover-community/mathlib4/pull/29610): ```lean theorem LinearMap.Eigenbasis.μ_equiv {ι ι' R G : Type} [Fintype ι] [Fintype ι'] [CommRing R] [IsDomain R] [AddCommGroup G] [Module R G] [Module.Free R G] [Module.Finite R G] {f : Module.End R G} (B₁ : f.Eigenbasis ι) (B₂ : f.Eigenbasis ι') : ∃ e : ι ≃ ι', B₁.μ = B₂.μ ∘ e := by classical have := congr(Polynomial.roots $(B₁.charpoly_eq.symm.trans B₂.charpoly_eq)) rw [Polynomial.roots_prod, Polynomial.roots_prod] at this; rotate_left · simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero] · simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero] simp_rw [Polynomial.roots_X_sub_C, Multiset.bind_singleton] at this exact ⟨Multiset.equivOfMapUnivEq this, (Multiset.compTriple_equivOfMapUnivEq this).comp_eq.symm⟩ ``` Co-authored-by: Aristotle Harmonic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	35/0	Mathlib/Data/Multiset/Fintype.lean	1	8	['Ruben-VandeVelde', 'github-actions', 'llllvvuu', 'vihdzp', 'wwylele']	nobody	none	8-35229 8 days ago	23-4259 23 days ago	23-4252 23 days
29990	pechersky author:pechersky	feat(Algebra/Subgroup/Lattice): `mem_biSup_of_directedOn`	Generalization of existing `mem_iSup_of_directed` On the way to characterization of the torsion subgroup as the sup over all subgroups of roots of unity --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra label:t-algebra$	35/10	Mathlib/Algebra/Group/Subgroup/Lattice.lean	1	1	['github-actions']	nobody	none	7-78132 7 days ago	7-78186 7 days ago	7-78173 7 days
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	28/21	Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean	3	6	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	none	7-72134 7 days ago	7-72159 7 days ago	24-1696 24 days
29995	vihdzp author:vihdzp	feat: more lemmas on `Concept`	These are used in the [`combinatorial-games`](https://github.com/vihdzp/combinatorial-games) repository. Note that `Concept α α (· ≤ ·)` is the Dedekind-McNeille completion, while `Concept α α (· < ·)` is a modified form of it that's used to define surreal cuts. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	40/0	Mathlib/Order/Concept.lean	1	10	['github-actions', 'linesthatinterlace', 'vihdzp']	nobody	none	7-61495 7 days ago	7-66432 7 days ago	7-66467 7 days
29996	vihdzp author:vihdzp	chore(Order/Concept): `IsIntent` and `IsExtent`	We define predicates for a set to be an intent/extent, and use them to define alternate constructors for a concept. Using these, we golf the complete lattice instances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	161/95	Mathlib/Order/Concept.lean	1	17	['github-actions', 'linesthatinterlace', 'plp127', 'vihdzp']	nobody	none	6-80900 6 days ago	7-66362 7 days ago	7-66396 7 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	none	5-62523 5 days ago	25-15604 25 days ago	25-15643 25 days
29362	stepanholub author:stepanholub	feat:(Data/List) add the notion of period of List and prove the Periodicity Lemma	Add the concept of the period of a List (word, sequence) which is missing, and prove its basic nontrivial property describing under which conditions list can have two periods known as the Periodicity Lemma (aka Fine-Wilf Theorem). ---	t-data new-contributor	227/0	Mathlib.lean,Mathlib/Data/List/PeriodicityLemma.lean	2	125	['Ruben-VandeVelde', 'Timeroot', 'fpvandoorn', 'github-actions', 'madvorak', 'plp127', 'stepanholub', 'wwylele']	nobody	2	5-24487 5 days ago	9-27301 9 days ago	27-23498 27 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	15	['MichaelStollBayreuth', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	none	4-27771 4 days ago	16-54193 16 days ago	16-55790 16 days

Stale assigned PRs on the review queue

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Approval(s)	Updated	Last status change	total time in review
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	none	65-25025 2 months ago	76-15701 2 months ago	96-62251 96 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	none	64-15496 2 months ago	82-61823 2 months ago	82-61843 82 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	1	63-5858 2 months ago	94-13598 3 months ago	113-64174 113 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	none	61-5832 2 months ago	108-7573 3 months ago	108-7611 108 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	none	60-59234 1 month ago	60-59234 1 month ago	101-68639 101 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	none	59-61178 1 month ago	59-61178 1 month ago	108-29890 108 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	2	59-61072 1 month ago	59-61072 1 month ago	146-18122 146 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	none	58-5846 1 month ago	91-17324 2 months ago	91-17360 91 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	none	57-5845 1 month ago	64-41894 2 months ago	91-29730 91 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	1	56-56022 1 month ago	68-39319 2 months ago	68-39345 68 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	1	56-5864 1 month ago	90-67481 2 months ago	112-25840 112 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	none	56-5856 1 month ago	65-82268 2 months ago	65-82254 65 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	none	53-5862 1 month ago	115-79572 3 months ago	131-25099 131 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	none	53-5857 1 month ago	84-44984 2 months ago	84-45028 84 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	none	51-5848 1 month ago	64-40604 2 months ago	64-40650 64 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	none	50-5833 1 month ago	59-60518 1 month ago	60-25991 60 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	none	48-5836 1 month ago	55-69365 1 month ago	55-69356 55 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	none	47-5837 1 month ago	54-19073 1 month ago	54-19111 54 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	none	46-5852 1 month ago	56-27544 1 month ago	57-2041 57 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	none	46-5850 1 month ago	53-42361 1 month ago	54-20564 54 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	none	45-5860 1 month ago	56-24329 1 month ago	56-24366 56 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	none	45-5858 1 month ago	55-30600 1 month ago	55-30643 55 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	none	45-5857 1 month ago	54-37187 1 month ago	54-37227 54 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	none	43-48973 1 month ago	43-48973 1 month ago	99-63452 99 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	none	42-5866 1 month ago	50-65202 1 month ago	50-65241 50 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	none	42-5863 1 month ago	49-46437 1 month ago	49-46413 49 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	none	41-38654 1 month ago	77-67100 2 months ago	77-67135 77 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	none	41-38616 1 month ago	110-51307 3 months ago	110-51348 110 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	none	41-5832 1 month ago	48-16684 1 month ago	48-16659 48 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	none	40-5837 1 month ago	49-2185 1 month ago	49-2161 49 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	none	40-5834 1 month ago	51-74450 1 month ago	51-77152 51 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	none	39-5866 1 month ago	46-49415 1 month ago	48-43441 48 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	none	39-5863 1 month ago	49-36063 1 month ago	53-53753 53 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	none	37-54501 1 month ago	130-11627 4 months ago	130-11672 130 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	1	37-39217 1 month ago	87-6924 2 months ago	87-6961 87 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	none	37-33493 1 month ago	145-30858 4 months ago	192-83067 192 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	none	37-26046 1 month ago	37-26067 1 month ago	80-3149 80 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	none	37-5623 1 month ago	145-10238 4 months ago	211-10211 211 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	none	36-36055 1 month ago	45-63218 1 month ago	45-63254 45 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	none	36-33153 1 month ago	59-19892 1 month ago	61-20554 61 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	none	35-63885 1 month ago	97-85101 3 months ago	98-3444 98 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	none	35-63641 1 month ago	105-14804 3 months ago	105-19407 105 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	none	35-40776 1 month ago	40-42495 1 month ago	66-33490 66 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	none	35-5878 1 month ago	47-46008 1 month ago	47-77371 47 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	none	35-5871 1 month ago	47-34126 1 month ago	47-34168 47 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	none	33-51864 1 month ago	34-19256 1 month ago	88-36789 88 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	none	33-19996 1 month ago	33-24712 1 month ago	102-51303 102 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	none	33-5832 1 month ago	43-49086 1 month ago	45-25928 45 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	none	32-71884 1 month ago	32-76930 1 month ago	97-47410 97 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	none	32-5857 1 month ago	46-41333 1 month ago	46-41369 46 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	none	31-34587 1 month ago	102-79429 3 months ago	103-6936 103 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	none	31-34508 1 month ago	113-44444 3 months ago	113-44419 113 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	1	31-5860 1 month ago	39-10138 1 month ago	39-15450 39 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	none	30-66366 1 month ago	75-43190 2 months ago	75-43234 75 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	none	30-5864 1 month ago	40-86308 1 month ago	40-86342 40 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	none	30-5863 1 month ago	39-32430 1 month ago	39-32463 39 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	1	29-74533 29 days ago	90-37659 2 months ago	90-37697 90 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	none	29-71067 29 days ago	84-62219 2 months ago	84-62255 84 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	none	29-58682 29 days ago	31-7948 1 month ago	64-69211 64 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	none	28-68914 28 days ago	59-61300 1 month ago	103-17514 103 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	none	28-58310 28 days ago	28-58310 28 days ago	34-44492 34 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	none	28-36906 28 days ago	35-60795 1 month ago	37-31400 37 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	none	28-5866 28 days ago	36-22096 1 month ago	42-49380 42 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	none	28-5864 28 days ago	37-12520 1 month ago	44-65734 44 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	1	28-5860 28 days ago	37-12753 1 month ago	37-13190 37 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	none	28-5859 28 days ago	37-2501 1 month ago	37-2485 37 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	none	28-5857 28 days ago	36-24509 1 month ago	36-24540 36 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	none	27-37207 27 days ago	27-38555 27 days ago	38-39930 38 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	none	27-5851 27 days ago	38-40481 1 month ago	51-10696 51 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	none	27-5849 27 days ago	40-22590 1 month ago	40-24338 40 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	none	26-56944 26 days ago	48-63399 1 month ago	48-63432 48 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	1	25-31726 25 days ago	25-36730 25 days ago	95-39039 95 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	none	24-41574 24 days ago	38-60310 1 month ago	38-60287 38 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	none	24-37910 24 days ago	54-27433 1 month ago	68-20261 68 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	none	24-30828 24 days ago	87-23458 2 months ago	87-23498 87 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	none	23-82986 23 days ago	101-84969 3 months ago	101-85005 101 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	none	22-28935 22 days ago	100-63123 3 months ago	100-63373 100 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	none	21-5870 21 days ago	31-25529 1 month ago	31-28571 31 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	none	20-27156 20 days ago	20-27181 20 days ago	168-14895 168 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	none	20-19423 20 days ago	20-26570 20 days ago	58-75852 58 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	none	20-5845 20 days ago	27-58270 27 days ago	28-64726 28 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	none	20-5843 20 days ago	36-58475 1 month ago	36-58492 36 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	none	19-60730 19 days ago	170-58962 5 months ago	226-19672 226 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	none	19-20370 19 days ago	59-60692 1 month ago	82-4032 82 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	1	19-5838 19 days ago	26-60796 26 days ago	53-38152 53 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	none	18-64651 18 days ago	142-47688 4 months ago	227-20712 227 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	none	18-48978 18 days ago	31-84769 1 month ago	47-84127 47 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	1	18-45324 18 days ago	36-60996 1 month ago	131-27043 131 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	none	18-39639 18 days ago	18-39647 18 days ago	82-53949 82 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	none	18-38789 18 days ago	22-33220 22 days ago	106-33262 106 days
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	none	17-73626 17 days ago	18-6824 18 days ago	20-32669 20 days
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	none	17-5863 17 days ago	24-68533 24 days ago	24-69302 24 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	none	17-5861 17 days ago	31-43173 1 month ago	33-53630 33 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	1	16-73800 16 days ago	59-35693 1 month ago	73-53225 73 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	none	16-41412 16 days ago	20-23949 20 days ago	116-8182 116 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	none	16-40584 16 days ago	43-47666 1 month ago	43-49075 43 days
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	none	16-33881 16 days ago	29-10598 29 days ago	104-38389 104 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	none	16-30034 16 days ago	30-25976 1 month ago	30-25953 30 days
26961	mariainesdff author:mariainesdff	feat(RingTheory/PowerSeries/Substitution): add API	Co-authored-by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	57/5	Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean	2	13	['Ruben-VandeVelde', 'github-actions', 'mariainesdff', 'mattrobball']	mattrobball assignee:mattrobball	none	15-54728 15 days ago	15-54728 15 days ago	62-74749 62 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	132/0	Mathlib.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Binomial.lean,Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean	5	13	['ScottCarnahan', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	kbuzzard assignee:kbuzzard	none	15-27916 15 days ago	50-15307 1 month ago	50-16762 50 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	none	15-10107 15 days ago	51-38747 1 month ago	88-18063 88 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']	jcommelin assignee:jcommelin	none	15-5852 15 days ago	22-18391 22 days ago	22-18747 22 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']	dupuisf assignee:dupuisf	none	15-5846 15 days ago	22-31679 22 days ago	22-32331 22 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']	mattrobball assignee:mattrobball	none	15-5841 15 days ago	22-12160 22 days ago	22-12278 22 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	810/2	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	12	['JovanGerb', 'github-actions', 'xyzw12345']	JovanGerb assignee:JovanGerb	none	14-78260 14 days ago	24-82849 24 days ago	72-49926 72 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	173/0	Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Integers.lean	2	7	['JovanGerb', 'github-actions', 'mariainesdff', 'mathlib4-merge-conflict-bot', 'pechersky']	mariainesdff assignee:mariainesdff	none	14-37806 14 days ago	56-28192 1 month ago	89-2704 89 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	6	['ShreckYe', 'bryangingechen', 'eric-wieser', 'github-actions']	bryangingechen assignee:bryangingechen	none	14-17690 14 days ago	26-53642 26 days ago	26-53685 26 days
27429	smorel394 author:smorel394	feat(RepresentationTheory/FinGroupCharZero): applications of Maschke's theorem	Prove some properties of representations that follow from Maschke's theorem: * If `G` is a finite group whose order is invertible in a field `k`, then every object of `Rep k G` (resp. `FDRep k G`) is injective and projective. * For an object `V` of `FDRep k G`, when `k` is an algebraically closed field in which the order of `G` is invertible: (1) `V` is simple if and only `V ⟶ V` is a `k`-vector space of dimension `1` (`FDRep.simple_iff_end_is_rank_one`); (2) When `k` is characteristic zero, `V` is simple if and only if `∑ g : G, V.character g * V.character g⁻¹ = Fintype.card G` (`FDRep.simple_iff_char_is_norm_one`). Note: This used to be #27165, but it was closed for some reason I don't understand. - [x] depends on: #27154 - [x] depends on: #27134 - [x] depends on: #27125 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	135/0	Mathlib.lean,Mathlib/RepresentationTheory/FinGroupCharZero.lean	2	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	jcommelin assignee:jcommelin	none	14-5863 14 days ago	21-38000 21 days ago	21-38350 21 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']	urkud assignee:urkud	none	14-5858 14 days ago	22-37100 22 days ago	22-37139 22 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']	dupuisf assignee:dupuisf	none	14-5857 14 days ago	21-52041 21 days ago	21-52017 21 days
29235	yoh-tanimoto author:yoh-tanimoto	feat(Topology/Algebra/Module/ClosedSubmodule): add `mapEquiv`, a variation of `ClosedSubmodule.map` for CLE	add `ClosedSubmodule.mapEquiv` for continuous linear equivalence. In this case, a closed submodule is mapped to a closed submodule, 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']	fpvandoorn assignee:fpvandoorn	none	13-15592 13 days ago	21-35406 21 days ago	21-37692 21 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']	b-mehta assignee:b-mehta	none	13-5843 13 days ago	22-35271 22 days ago	22-35349 22 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	5	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'themathqueen']	kbuzzard assignee:kbuzzard	none	12-19430 12 days ago	27-18773 27 days ago	29-41727 29 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']	Vierkantor assignee:Vierkantor	none	11-5856 11 days ago	18-45415 18 days ago	20-23767 20 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	118/0	Mathlib.lean,Mathlib/Geometry/Euclidean/Angle/Bisector.lean	2	7	['eric-wieser', 'github-actions', 'jsm28']	JovanGerb assignee:JovanGerb	none	11-5854 11 days ago	19-5977 19 days ago	19-5954 19 days
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']	joneugster assignee:joneugster	none	11-5852 11 days ago	18-20568 18 days ago	18-20545 18 days
29624	mcdoll author:mcdoll	feat(LinearAlgebra/LinearPMap): add definition of resolvent and first resolvent identity	--- [![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']	kim-em assignee:kim-em	none	10-19620 10 days ago	18-30571 18 days ago	18-30548 18 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']	grunweg assignee:grunweg	none	10-5850 10 days ago	17-51867 17 days ago	17-51905 17 days
27817	zhuyizheng author:zhuyizheng	feat: add IMO2025P1	Add a solution to IMO2025P1, the original problem statement from https://github.com/jsm28/IMOLean --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO new-contributor	1310/0	Archive.lean,Archive/Imo/Imo2025Q1.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	dwrensha assignee:dwrensha	none	9-55374 9 days ago	14-74846 14 days ago	47-13552 47 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. ---	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	none	9-51869 9 days ago	30-37985 1 month ago	30-38020 30 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	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	none	9-51799 9 days ago	30-48767 1 month ago	66-53348 66 days
26396	xroblot author:xroblot	feat(RingTheory): define the dual of a basis for the trace and prove basic properties	Specialize the construction of `BilinForm.dualBasis` to the case of the trace and proves basic results about it. This will be useful for future works on the [Submodule.traceDual](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/DedekindDomain/Different.html#Submodule.traceDual) ---	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	none	9-51571 9 days ago	18-44873 18 days ago	99-12494 99 days
26155	xroblot author:xroblot	feat(DedekindDomain/Different): add the transitivity formula	This PR proves the transitivity formula for the different ideal. The PR also adds one new instance: - `FiniteDimensional (FractionRing A) (FractionRing B)` deduced from `Module.Finite A B` when `B` is a Dedekind domain. ---	t-algebra label:t-algebra$	177/10	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	none	9-51535 9 days ago	29-67112 29 days ago	101-73960 101 days
28871	JaafarTanoukhi author:JaafarTanoukhi	feat(Combinatorics/Digraph): Tournaments	Define orientations and tournaments. Related to #26771. Co-authored-by: Rida Hamadani --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	62/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Digraph/Tournament.lean	3	5	['JaafarTanoukhi', 'NotWearingPants', 'Rida-Hamadani', 'github-actions']	kmill assignee:kmill	1	9-35507 9 days ago	40-25744 1 month ago	40-25778 40 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	none	9-26821 9 days ago	25-20993 25 days ago	38-36905 38 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	9	['chrisflav', 'eric-wieser', 'github-actions', 'ocfnash', 'xyzw12345']	mattrobball assignee:mattrobball	none	9-5854 9 days ago	60-32241 1 month ago	75-43556 75 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']	joneugster assignee:joneugster	1	9-5852 9 days ago	16-72191 16 days ago	22-35325 22 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']	kim-em assignee:kim-em	none	9-5850 9 days ago	16-45807 16 days ago	20-58728 20 days
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']	joneugster assignee:joneugster	none	9-5847 9 days ago	17-39744 17 days ago	17-39778 17 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 FLT new-contributor	97/0	Mathlib/GroupTheory/DoubleCoset.lean	1	16	['Ruben-VandeVelde', 'WilliamCoram', 'github-actions', 'mathlib4-merge-conflict-bot']	mariainesdff assignee:mariainesdff	none	8-56887 8 days ago	15-32532 15 days ago	74-12007 74 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	none	8-35561 8 days ago	26-18489 26 days ago	26-18482 26 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 maintainer-merge	451/3	Mathlib.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/PNat.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/GroupTheory/DivisibleHull.lean	6	106	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp', 'wwylele']	tb65536 assignee:tb65536	2	8-5852 8 days ago	15-31729 15 days ago	25-8929 25 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/)	t-meta	40/0	Mathlib/Tactic/Linter/UnusedTactic.lean,Mathlib/Tactic/Linter/UnusedTacticExtension.lean,Mathlib/Tactic/Says.lean,MathlibTest/says.lean	4	3	['JovanGerb', 'MichaelStollBayreuth', 'github-actions']	JovanGerb assignee:JovanGerb	none	8-5851 8 days ago	15-64225 15 days ago	23-83772 23 days
29765	YaelDillies author:YaelDillies	feat: commutative monoids are internal monoids	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-category-theory	76/6	Mathlib/CategoryTheory/Monoidal/Cartesian/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Mon_.lean	2	3	['YaelDillies', 'eric-wieser', 'github-actions']	kim-em assignee:kim-em	none	8-5847 8 days ago	15-68810 15 days ago	15-68844 15 days
29769	Vierkantor author:Vierkantor	CI: run a weekly linter workflow	This PR adds a workflow analogous to the nightly regression lints, that reports possible refactors using the tactic analysis framework. Those would be too noisy or take too much time to run in regular CI. As a first linter, we have the `mergeWithGrind` linter that reports when a sequence of tactics followed by `grind` can become just `grind`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	102/1	.github/workflows/weekly-lints.yml,Mathlib/Init.lean	2	1	['github-actions']	bryangingechen assignee:bryangingechen	none	8-5846 8 days ago	15-56755 15 days ago	15-56733 15 days
29771	Vierkantor author:Vierkantor	refactor(TacticAnalysis): use full CommandElabM context in test	Running the `rwMerge` linter on the whole of Mathlib reveals that the tactic analysis framework did not always correctly pass the environment to the test step of a pass. By running the test in a full `CommandElabM` and adding a `ContextInfo` and `TacticInfo`, we can access the right environment (using the `ctxI.runTacticCode` function). There are still a few subtle issues to do with notation but I would like to get this fix in first, since it involves some larger refactors. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	44/17	Mathlib/Tactic/TacticAnalysis.lean,Mathlib/Tactic/TacticAnalysis/Declarations.lean,MathlibTest/TacticAnalysis.lean	3	7	['adomani', 'bryangingechen', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	kim-em assignee:kim-em	none	8-5845 8 days ago	15-39771 15 days ago	15-56300 15 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	2	['github-actions', 'joelriou']	joneugster assignee:joneugster	none	7-62287 7 days ago	22-53028 22 days ago	22-53004 22 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']	b-mehta assignee:b-mehta	none	7-5861 7 days ago	19-81261 19 days ago	19-84485 19 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']	b-mehta assignee:b-mehta	none	7-5860 7 days ago	30-24280 1 month ago	30-24300 30 days
29823	themathqueen author:themathqueen	feat(Algebra/Group/Submonoid): add `(Add)Submonoid.closure_pi`	This generalizes and moves some proofs from subgroups to submonoids in order to add `(Add)Submonoid.closure_pi`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	86/45	Mathlib.lean,Mathlib/Algebra/Group/Subgroup/Finite.lean,Mathlib/Algebra/Group/Submonoid/Finite.lean	3	6	['eric-wieser', 'github-actions', 'themathqueen']	dagurtomas assignee:dagurtomas	none	7-5854 7 days ago	14-16258 14 days ago	14-16299 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']	chrisflav assignee:chrisflav	none	6-5840 6 days ago	19-47950 19 days ago	19-47934 19 days
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']	chrisflav assignee:chrisflav	1	6-5839 6 days ago	17-46460 17 days ago	18-5961 18 days
29791	llllvvuu author:llllvvuu	feat(Order): lemmas about `iSupIndep`	* generalize `Finset.SupIndep` "bind" operations from `DistribLattice` to `IsModularLattice` * new lemma `iSupIndep.iInf` * more characterizations of `iSupIndep` on submodules: * `iSupIndep_iff_finset_sum_eq_zero_imp_eq_zero` * `iSupIndep_iff_finset_sum_eq_imp_eq` * add `@[simp]` and `@[grind]` attributes which were helpful for these proofs Original motivation was to have the following fact: ```lean theorem iSupIndep_iInf_genEigenspace [NoZeroSMulDivisors R M] {α : Type*} (f : α → End R M) (k : ℕ∞) : iSupIndep fun μ : α → R ↦ ⨅ a : α, ((f a).genEigenspace (μ a)) k := .iInf (f · \|>.genEigenspace · k) (f · \|>.independent_genEigenspace k) ``` Co-authored-by: Aristotle Harmonic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	166/62	Mathlib/Data/Finset/Disjoint.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Finset/Lattice/Union.lean,Mathlib/Data/Finset/Sigma.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/Logic/Embedding/Basic.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/Partition/Finpartition.lean,Mathlib/Order/SupIndep.lean	11	12	['github-actions', 'leanprover-bot', 'llllvvuu']	bryangingechen assignee:bryangingechen	none	6-5839 6 days ago	14-2428 14 days ago	14-26048 14 days
29512	grunweg author:grunweg	feat: check for PR titles which do not start with "feat" etc.	We ignore draft PRs and PRs with the WIP label. The set of checks is intentionally kept small, and could be expanded in the future. --- More basic version of #16303: given that mathlib's statistics will use the PR kind, let's make sure PR kinds are somewhat appropriate. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		365/0	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ValidatePRTitle.lean,lakefile.lean,scripts/README.md,scripts/check_title_labels.lean	10	17	['bryangingechen', 'eric-wieser', 'github-actions', 'grunweg']	bryangingechen assignee:bryangingechen	none	5-73776 5 days ago	23-36211 23 days ago	23-36187 23 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	none	5-62509 5 days ago	30-41622 1 month ago	38-85358 38 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	none	5-62497 5 days ago	112-46609 3 months ago	112-46585 112 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	none	5-62471 5 days ago	67-31845 2 months ago	67-31887 67 days
29361	FlAmmmmING author:FlAmmmmING	feat: Catalan generating function as a formal power series	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	71/0	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Catalan.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'wwylele']	kbuzzard assignee:kbuzzard	none	5-34539 5 days ago	28-64930 28 days ago	28-64960 28 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	231/0	Mathlib.lean,Mathlib/Order/BourbakiWitt.lean,docs/1000.yaml	3	7	['eric-wieser', 'fmortimore', 'github-actions', 'wwylele']	Vierkantor assignee:Vierkantor	none	5-21048 5 days ago	19-17778 19 days ago	19-17809 19 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']	awainverse assignee:awainverse	none	5-5853 5 days ago	28-31330 28 days ago	28-31373 28 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']	awainverse assignee:awainverse	none	5-5852 5 days ago	27-69952 27 days ago	27-69986 27 days
29758	NotWearingPants author:NotWearingPants	feat(RingTheory/RootsOfUnity): exp(pi * i * q) is a root of unity for rational q	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	32/1	Mathlib/RingTheory/RootsOfUnity/Complex.lean	1	5	['NotWearingPants', 'Ruben-VandeVelde', 'github-actions', 'kckennylau']	chrisflav assignee:chrisflav	none	5-5851 5 days ago	15-10667 15 days ago	15-17667 15 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	none	4-66791 4 days ago	35-5518 1 month ago	35-5551 35 days
29735	vihdzp author:vihdzp	feat: order instances on quotients	We define a `Preorder (Quotient s)` instance in the natural way, and prove that it can be strengthened to a `LinearOrder` when all equivalence classes are `OrdConnected`. --- See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Quotient.20of.20linear.20order.20is.20linear.20order/near/539915988) for some long-winded discussion about this. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	125/0	Mathlib.lean,Mathlib/Order/Quotient.lean	2	3	['github-actions', 'plp127']	bryangingechen assignee:bryangingechen	none	4-49046 4 days ago	16-76495 16 days ago	16-76529 16 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']	pechersky assignee:pechersky	none	4-5850 4 days ago	64-56268 2 months ago	64-56306 64 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']	pechersky assignee:pechersky	none	4-5849 4 days ago	62-40578 2 months ago	63-7710 63 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']	pechersky assignee:pechersky	none	4-5848 4 days ago	59-5435 1 month ago	59-33481 59 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']	pechersky assignee:pechersky	none	4-5847 4 days ago	57-58325 1 month ago	57-58365 57 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']	pechersky assignee:pechersky	none	4-5846 4 days ago	56-45050 1 month ago	56-45485 56 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']	alreadydone assignee:alreadydone	1	4-5844 4 days ago	29-11912 29 days ago	29-31099 29 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']	YaelDillies assignee:YaelDillies	1	4-5843 4 days ago	28-52542 28 days ago	28-52577 28 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/)		332/331	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/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	73	5	['euprunin', 'github-actions', 'mathlib4-merge-conflict-bot']	dwrensha assignee:dwrensha	1	3-54374 3 days ago	18-60588 18 days ago	29-61732 29 days
29257	harahu author:harahu	doc: attach "pre", "pseudo", "semi" and "sub" as a prefixes where they are now free-standing	These are all examples of [bound morphemes](https://en.wikipedia.org/wiki/Bound_and_free_morphemes) and should be attached, either in closed form or by hyphen, to some other construct. Whether to write the resulting words with a hyphen or in closed form is a stylistic choice and I am open to discussing the specifics. I've made choices based on existing literature and what I personally found natural. --- [![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	1	3-53109 3 days ago	31-28211 1 month ago	31-28249 31 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	291/0	Mathlib.lean,Mathlib/Topology/Convenient/GeneratedBy.lean,docs/references.bib	3	10	['github-actions', 'joelriou', 'peabrainiac']	jcommelin assignee:jcommelin	none	3-35435 3 days ago	29-61503 29 days ago	29-61479 29 days
29772	ScottCarnahan author:ScottCarnahan	feat (RingTheory/HahnSeries/Multiplication): Add group instances to HahnModule	This PR adds `Zero` and `AddCommGroup` instances to `HahnModule` when appropriate. We also add comparison lemmas for subtraction in the `AddCommGroup` case, and reorganize some `variables`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	18/9	Mathlib/RingTheory/HahnSeries/Multiplication.lean	1	1	['github-actions']	erdOne assignee:erdOne	none	3-5833 3 days ago	15-54019 15 days ago	15-54054 15 days
29781	chrisflav author:chrisflav	feat(RingTheory/Finiteness): a finite and finitely presented algebra is finitely presented	We show that if `S` is finite as a module over `R` and finitely presented as an algebra over `R`, then it is finitely presented as a module over `R`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	357/36	Mathlib.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Finiteness/ModuleFinitePresentation.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Quotient.lean	9	1	['github-actions']	erdOne assignee:erdOne	none	3-5832 3 days ago	15-34501 15 days ago	15-34480 15 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	6	['faenuccio', 'github-actions', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	none	2-58574 2 days ago	26-31844 26 days ago	77-48607 77 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	8	['YaelDillies', 'eric-wieser', 'github-actions', 'riccardobrasca']	eric-wieser assignee:eric-wieser	none	2-57617 2 days ago	26-69438 26 days ago	30-30781 30 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']	riccardobrasca assignee:riccardobrasca	none	2-57555 2 days ago	30-57643 1 month ago	30-57668 30 days
26332	Timeroot author:Timeroot	feat(ModelTheory/Definability): TermDefinable functions	This PR continues the work from #23506. Original PR: https://github.com/leanprover-community/mathlib4/pull/23506	t-logic	145/0	Mathlib/Data/Rel.lean,Mathlib/ModelTheory/Definability.lean,scripts/noshake.json	3	28	['Timeroot', 'github-actions', 'mathlib4-merge-conflict-bot', 'staroperator']	fpvandoorn assignee:fpvandoorn	1	2-46750 2 days ago	18-37835 18 days ago	99-86022 99 days
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	14	['fweth', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	none	2-5865 2 days ago	26-43028 26 days ago	46-15189 46 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.boundedEulerChar`: The Euler characteristic over a finite set * `ChainComplex.eulerChar`: The Euler characteristic as an infinite sum * `ChainComplex.homologyBoundedEulerChar`: The homological Euler characteristic over a finite set * `ChainComplex.homologyEulerChar`: The homological Euler characteristic as an infinite sum Both bounded and infinite definitions work with ℤ-indexed complexes over any ring R. The file also includes theorems relating the formally infinite sums to finite sums when there is finite support: * `ChainComplex.eulerChar_eq_boundedEulerChar`: The infinite Euler characteristic equals the bounded one when the chain complex vanishes outside a finite set * `ChainComplex.homologyEulerChar_eq_homologyBoundedEulerChar`: The infinite homological Euler characteristic equals the bounded one when homology vanishes outside a finite set ### Main result (in `EulerPoincare.lean`) * `ChainComplex.eulerChar_eq_homology_eulerChar`: For ℤ-indexed bounded chain complexes of finite-dimensional modules over a division ring, the alternating sum of chain dimensions equals the alternating sum of homology dimensions. --- Related to: #29639, #29643, #29646	new-contributor t-algebra label:t-algebra$	444/0	Mathlib.lean,Mathlib/Algebra/Homology/EulerCharacteristic.lean,Mathlib/Algebra/Homology/EulerPoincare.lean	3	19	['github-actions', 'jessealama', 'joelriou', 'kim-em']	dagurtomas assignee:dagurtomas	none	1-70864 1 day ago	16-44650 16 days ago	17-54499 17 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	13	['D-Thomine', 'github-actions', 'leanprover-community-bot-assistant', 'lua-vr', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	urkud assignee:urkud	none	1-59763 1 day ago	38-78606 1 month ago	45-48074 45 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	18	['github-actions', 'loefflerd', 'mariainesdff', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	loefflerd and mattrobball assignee:loefflerd assignee:mattrobball	none	1-56539 1 day ago	17-45762 17 days ago	74-78772 74 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	none	1-38173 1 day ago	78-29979 2 months ago	78-34288 78 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	8	['alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot', 'pechersky', 'smmercuri']	alreadydone assignee:alreadydone	1	0-70289 19 hours ago	39-85290 1 month ago	73-51564 73 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	8	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	alreadydone assignee:alreadydone	none	0-41909 11 hours ago	37-26198 1 month ago	87-11205 87 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	none	0-38492 10 hours ago	44-43051 1 month ago	91-27919 91 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']	pechersky assignee:pechersky	none	0-5868 1 hour ago	29-28704 29 days ago	45-3930 45 days
29356	Paul-Lez author:Paul-Lez	feat(Mathlib/FieldTheory/RatFunc/Basic): add characteristic instances for `RatFunc`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	63/17	Mathlib.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Field.lean,Mathlib/Algebra/Algebra/IsSimpleRing.lean,Mathlib/Algebra/CharP/Algebra.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/FieldTheory/Differential/Liouville.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Finite/GaloisField.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean	11	8	['Paul-Lez', 'eric-wieser', 'github-actions']	kim-em assignee:kim-em	none	0-5866 1 hour ago	29-15711 29 days ago	29-15741 29 days

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

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PRs addressing technical debt

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
30107	grunweg author:grunweg	chore: track occurrences of 'nonrec' as technical debt	Matches leanprover-community/leanprover-community.github.io#689: only merge when that is deemed a good idea. -------- TODO: make the count more robust, for instance count all occurrences of "^nonrec " plus those of "^[private\|protected] nonrec ". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt CI	1/0	scripts/technical-debt-metrics.sh	1	1	['github-actions']	nobody	2-47887 2 days ago	2-65137 2 days ago	2-65116 2 days
30165	j-loreaux author:j-loreaux	chore(Analysis/NormedSpace/Extend): deprecate module	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-analysis easy	4/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/Extend.lean	2	1	['github-actions']	nobody	0-46532 12 hours ago	0-46554 12 hours ago	0-46587 12 hours
13791	digama0 author:digama0	refactor: Primrec and Partrec	General cleanup of the `Primrec` and `Partrec` files, to better adjust to lean 4 things. The main user-visible change is that `Primrec₂` is no longer a `def` but an `abbrev`, because it was causing inference issues in lean 4. I also removed all the nonterminal `simp`s in `PartrecCode.lean`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-computability merge-conflict	585/778	Mathlib/Computability/Ackermann.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/Primrec.lean	5	2	['github-actions', 'grunweg']	nobody	411-22668 1 year ago	451-46983 1 year ago	1-84718 1 day
15448	urkud author:urkud	chore(*): deprecate `Option.elim'`	Use `Option.elim` instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt merge-conflict awaiting-author	54/50	Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/Calculus/LagrangeMultipliers.lean,Mathlib/CategoryTheory/Category/PartialFun.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Data/Option/Defs.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/Logic/Embedding/Set.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/Topology/Compactness/Paracompact.lean,Mathlib/Topology/LocallyFinite.lean	17	12	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'grunweg', 'urkud']	nobody	410-32633 1 year ago	411-21780 1 year ago	7-18420 7 days
16464	Parcly-Taxel author:Parcly-Taxel	chore: deprecate `Nat.(case_)strong_induction_on`	…in favour of the now-renamed `Nat.(case)strongInductionOn` in core.	tech debt merge-conflict	54/56	Archive/Imo/Imo1981Q3.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Hofer.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Derangements/Finite.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/SetFamily/AhlswedeZhang.lean,Mathlib/Computability/Primrec.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Nat/Defs.lean,Mathlib/Data/Nat/Digits.lean,Mathlib/Data/Nat/Log.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/LinearAlgebra/Eigenspace/Triangularizable.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/NumberTheory/BernoulliPolynomials.lean,Mathlib/NumberTheory/DiophantineApproximation.lean,Mathlib/NumberTheory/Pell.lean,Mathlib/NumberTheory/Primorial.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/RingTheory/Adjoin/PowerBasis.lean,Mathlib/RingTheory/LittleWedderburn.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean,Mathlib/RingTheory/Polynomial/Eisenstein/IsIntegral.lean,Mathlib/RingTheory/Polynomial/Nilpotent.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/QuotientNilpotent.lean,Mathlib/RingTheory/WittVector/Defs.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/StructurePolynomial.lean,Mathlib/SetTheory/Surreal/Dyadic.lean,Mathlib/Topology/Metrizable/Uniformity.lean	43	13	['Parcly-Taxel', 'b-mehta', 'github-actions', 'jcommelin']	nobody	378-32136 1 year ago	378-32136 1 year ago	8-1989 8 days
20872	grunweg author:grunweg	feat: lint against the tactic.skipAssignedInstances option in mathlib	This means we can remove the corresponding technical debt entry. We also correct some outdated details in the Linter/Style.lean docstring. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-linter merge-conflict awaiting-author	63/7	Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Topology/Separation/Regular.lean,MathlibTest/LintStyle.lean,scripts/technical-debt-metrics.sh	5	17	['adomani', 'github-actions', 'grunweg']	nobody	247-21842 8 months ago	247-21842 8 months ago	0-9411 2 hours
22682	grunweg author:grunweg	chore(Topology/Homeomorph): split out various constructions	This makes `Homeomorph.lean` slightly more manageable, and also is a mild import reduction. edit: also split out IsHomeomorph, as this allows removing the dependencies on Constructions. Let's see if this gains much --- I don't feel strongly about this PR, but we might as well take it. - [ ] depends on: #22681 - [ ] depends on #22827 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-topology RFC merge-conflict	341/290	Mathlib.lean,Mathlib/Topology/Category/TopCat/ULift.lean,Mathlib/Topology/Homeomorph/Constructions.lean,Mathlib/Topology/Homeomorph/IsHomeomorph.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/NoetherianSpace.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	185-80862 6 months ago	185-80862 6 months ago	14-35834 14 days
23411	PatrickMassot author:PatrickMassot	chore: remove finiteness from Order.Filter.Lift	Co-authored-by: Anatole Dedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	longest-pole t-topology merge-conflict	48/21	Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Order/Filter/Lift.lean,Mathlib/Order/Filter/SmallSets.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Basic.lean	7	4	['Vierkantor', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	178-61883 5 months ago	178-81452 5 months ago	10-21608 10 days
24100	eric-wieser author:eric-wieser	feat: restore some explicit binders from Lean 3	Part of #24099 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt merge-conflict awaiting-author	39/42	Mathlib/Data/FinEnum.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Compactness/CompactlyGeneratedSpace.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/Metrizable/CompletelyMetrizable.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	10	3	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	131-45036 4 months ago	131-45038 4 months ago	34-33204 34 days
12879	grunweg author:grunweg	feat: port ge_or_gt linter from mathlib3	Code works and is essentially green: next step is to split up into separate PRs. Feedback welcome on whether: - all the test changes are good, or I should simply allow it in more cases - if calc blocks need to be explicitly exempt --- - [ ] depends on: #12933 - [ ] depends on: #12934 - [ ] depends on: #12931 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-linter merge-conflict blocked-by-other-PR	736/319	Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q5.lean,Archive/Imo/Imo2019Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BirthdayProblem.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Star/CHSH.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Group/ControlledClosure.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Int/Lemmas.lean,Mathlib/Data/Nat/Dist.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/Parity.lean,Mathlib/Data/Nat/Upto.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/UInt.lean,Mathlib/GroupTheory/Coxeter/Length.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/Rayleigh.lean,Mathlib/Order/Filter/AtTopBot.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/RingTheory/Adjoin/Basic.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CancelDenoms/Core.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/IntervalCases.lean,Mathlib/Tactic/Linarith/Datatypes.lean,Mathlib/Tactic/Linarith/Lemmas.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linter/GeOrGt.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/NormNum/GCD.lean,Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean,Mathlib/Topology/MetricSpace/CauSeqFilter.lean,Mathlib/Topology/MetricSpace/Cauchy.lean,Mathlib/Topology/MetricSpace/Closeds.lean,Mathlib/Topology/Sequences.lean,scripts/lint-style.py,test/Explode.lean,test/GCongr/inequalities.lean,test/GeOrGt.lean,test/LibrarySearch/IsCompact.lean,test/LibrarySearch/basic.lean,test/Recall.lean,test/Rify.lean,test/Use.lean,test/cancel_denoms.lean,test/congr.lean,test/delabLinearIndependent.lean,test/delaborators.lean,test/interval_cases.lean,test/linarith.lean	109	3	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	429-66283 1 year ago	451-46983 1 year ago	0-15202 4 hours

PRs blocked on a zulip discussion

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
15649	TpmKranz author:TpmKranz	feat(Computability): introduce Generalised NFA as bridge to Regular Expression	Lays the groundwork for a proof of equivalence of NFA and RE, w.r.t. described language. Actual connection to NFA comes later, after the groundwork for the opposite direction has been laid. Second chunk of #12648 --- - [x] depends on: #15647 [Data.FinEnum.Option unchanged since then] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor awaiting-author	298/0	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib	5	6	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'trivial1711']	nobody	151-15018 4 months ago	151-15027 4 months ago	23-54870 23 days
20648	anthonyde author:anthonyde	feat: formalize regular expression -> εNFA	The file `Computability/RegularExpressionsToEpsilonNFA.lean` contains a formal definition of Thompson's method for constructing an `εNFA` from a `RegularExpression` and a proof of its correctness. --- - [x] depends on: #20644 - [x] depends on: #20645 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	5	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'qawbecrdtey']	nobody	151-14329 4 months ago	151-14964 4 months ago	75-77754 75 days
20238	maemre author:maemre	feat(Computability/DFA): Closure of regular languages under some set operations	This shows that regular languages are closed under complement and intersection by constructing DFAs for them. --- Closure under all other operations will be proved when someone adds the proof for DFA<->regular expression equivalence, so they are not part of this PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor awaiting-author	159/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	59	['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'meithecatte', 'urkud']	EtienneC30 assignee:EtienneC30	121-67189 3 months ago	151-14928 4 months ago	48-67492 48 days
23929	meithecatte author:meithecatte	feat(Computability/NFA): improve bound on pumping lemma	--- - [x] depends on: #25321 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor	101/10	Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean	2	41	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'meithecatte']	nobody	118-24580 3 months ago	118-24581 3 months ago	34-10595 34 days
29072	yury-harmonic author:yury-harmonic	feat({Nat,Int}/ModEq): add lemmas	--- I'm not sure that I named these lemmas correctly. Suggestions about better names are welcome! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-zulip	171/15	Mathlib/Data/Int/ModEq.lean,Mathlib/Data/Nat/ModEq.lean	2	5	['eric-wieser', 'github-actions', 'yury-harmonic']	nobody	35-68462 1 month ago	35-68462 1 month ago	0-55232 15 hours
29582	YaelDillies author:YaelDillies	chore: rename `_root_.prop` to `Prop.finite`	This was a surprising name! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-zulip	1/1	Mathlib/Data/Fintype/EquivFin.lean	1	11	['YaelDillies', 'bryangingechen', 'eric-wieser', 'github-actions', 'grunweg', 'plp127']	nobody	10-80704 10 days ago	10-80705 10 days ago	3-1360 3 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/)	awaiting-zulip maintainer-merge new-contributor	158/0	Counterexamples.lean,Counterexamples/EulerSumOfPowers.lean	2	43	['MichaelStollBayreuth', 'NotWearingPants', 'eric-wieser', 'github-actions', 'tb65536', 'urkud']	MichaelStollBayreuth assignee:MichaelStollBayreuth	7-24820 7 days ago	7-24876 7 days ago	24-25032 24 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/)	awaiting-zulip t-analysis awaiting-author	580/9	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	42	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel', 'urkud']	j-loreaux assignee:j-loreaux	6-29401 6 days ago	6-29401 6 days ago	17-56980 17 days
29002	grunweg author:grunweg	chore: move Data/Real/Irrational to RingTheory	It certainly has nothing to do with data (structures). --- I'm less sure where to put it instead. [zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Cleaning.20up.20.60Data.60/with/536301893) suggested this place; in the future, this could also be split. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed awaiting-zulip	10/10	Counterexamples/IrrationalPowerOfIrrational.lean,Mathlib.lean,Mathlib/Analysis/Real/Pi/Irrational.lean,Mathlib/Data/Real/GoldenRatio.lean,Mathlib/NumberTheory/DiophantineApproximation/Basic.lean,Mathlib/NumberTheory/Rayleigh.lean,Mathlib/NumberTheory/Transcendental/Liouville/Basic.lean,Mathlib/RingTheory/Real/Irrational.lean,Mathlib/Tactic/NormNum/Irrational.lean,Mathlib/Topology/Instances/AddCircle/DenseSubgroup.lean,Mathlib/Topology/Instances/Irrational.lean	11	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	5-61275 5 days ago	5-61358 5 days ago	0-67 1 minute
28925	grunweg author:grunweg	chore: remove `linear_combination'` tactic	When `linear_combination` was refactored in #15899, the old code was kept as the `linear_combination'` tactic, for easier migration. The consensus of the zulip discussion ([#mathlib4 > Narrowing the scope of `linear_combination` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Narrowing.20the.20scope.20of.20.60linear_combination.60/near/470237816)) was to wait, and "revisit this once people have experienced the various tactics in practice". One year later, the old tactic has almost no uses: it is unused in mathlib; [searching on github](https://github.com/search?q=linear_combination%27%20path%3A*.lean&type=code) yields 37 hits --- all of which are in various forks of mathlib. Thus, removing this tactic seems appropriate. --- Do not merge before the zulip discussion has concluded! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed awaiting-zulip	0/564	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LinearCombination'.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,MathlibTest/linear_combination'.lean	5	3	['euprunin', 'github-actions', 'grunweg']	nobody	5-32839 5 days ago	39-18747 1 month ago	0-1 1 second
11800	JADekker author:JADekker	feat : Define KappaLindelöf spaces	Define KappaLindelöf spaces by following the first one-third of the API for Lindelöf spaces. The remainder will be added in a future PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-topology merge-conflict please-adopt	301/2	Mathlib.lean,Mathlib/Topology/Compactness/KappaLindelof.lean,Mathlib/Topology/Compactness/Lindelof.lean	3	38	['ADedecker', 'JADekker', 'PatrickMassot', 'StevenClontz', 'adomani', 'github-actions', 'grunweg', 'kim-em', 'urkud']	nobody	382-78451 1 year ago	383-14026 1 year ago	119-10687 119 days
17623	FR-vdash-bot author:FR-vdash-bot	feat(Algebra/Order/GroupWithZero/Unbundled): add some lemmas	Some lemmas in `Algebra.Order.GroupWithZero.Unbundled` have incorrect or unsatisfactory names, or assumptions that can be omitted using `ZeroLEOneClass`. The lemmas added in this PR are versions of existing lemmas that use the correct or better name or `ZeroLEOneClass` to omit an assumption. The original lemmas will be deprecated in #17593. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `mul_le_one_left₀` \| `Left.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_le_of_lt_left₀` (`0 ≤ ·` version) / `mul_lt_one_of_le_of_lt_of_pos_left` \| `Left.mul_lt_of_le_of_lt_one_of_pos` \| \| `mul_lt_one_of_lt_of_le_left₀` \| `Left.mul_lt_of_lt_of_le_one_of_nonneg` \| \| `mul_le_one_right₀` \| `Right.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_lt_of_le_right₀` (`0 ≤ ·` version) / `mul_lt_one_of_lt_of_le_of_pos_right` \| `Right.mul_lt_one_of_lt_of_le_of_pos` \| \| `mul_lt_one_of_le_of_lt_right₀` \| `Right.mul_lt_one_of_le_of_lt_of_nonneg` \| The following lemmas use `ZeroLEOneClass`. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `(Left.)one_le_mul₀` \| `Left.one_le_mul_of_le_of_le` \| \| `Left.one_lt_mul_of_le_of_lt₀` \| `Left.one_lt_mul_of_le_of_lt_of_pos` \| \| `Left.one_lt_mul_of_lt_of_le₀` \| `Left.lt_mul_of_lt_of_one_le_of_nonneg` / `one_lt_mul_of_lt_of_le` (still there) \| \| `(Left.)one_lt_mul₀` \| \| \| `Right.one_le_mul₀` \| `Right.one_le_mul_of_le_of_le` \| \| `Right.one_lt_mul_of_lt_of_le₀` \| `Right.one_lt_mul_of_lt_of_le_of_pos` \| \| `Right.one_lt_mul_of_le_of_lt₀` \| `Right.one_lt_mul_of_le_of_lt_of_nonneg` / `one_lt_mul_of_le_of_lt` (still there) / `one_lt_mul` (still there) \| \| `Right.one_lt_mul₀` \| `Right.one_lt_mul_of_lt_of_lt` \| --- Split from #17593. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-order t-algebra merge-conflict label:t-algebra$	146/44	Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean	2	11	['FR-vdash-bot', 'YaelDillies', 'github-actions', 'j-loreaux']	nobody	317-51701 10 months ago	317-51701 10 months ago	33-64877 33 days
8370	eric-wieser author:eric-wieser	refactor(Analysis/NormedSpace/Exponential): remove the `𝕂` argument from `exp`	This argument is still needed for almost all the lemmas, which means it can longer be found by unification. We keep around `expSeries 𝕂 A`, as it's needed for talking about the radius of convergence over different base fields. This is a prerequisite for #8372, as we can't merge the functions until they have the same interface.\ Zulip thread: [#mathlib4 > Real.exp @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Real.2Eexp/near/401602245) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This is started from the mathport output on https://github.com/leanprover-community/mathlib/pull/19244	awaiting-zulip t-analysis merge-conflict	432/387	Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/Analysis/Normed/Algebra/QuaternionExponential.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/NormedSpace/DualNumber.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean	11	29	['YaelDillies', 'eric-wieser', 'girving', 'github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-community-bot-assistant', 'urkud']	nobody	162-7078 5 months ago	173-35708 5 months ago	29-60989 29 days
15651	TpmKranz author:TpmKranz	feat(Computability/NFA): operations for Thompson's construction	Lays the groundwork for a proof of equivalence of RE and NFA, w.r.t. described language. Actual connection to REs comes later, after the groundwork for the opposite direction has been laid. Third chunk of #12648 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	307/5	Mathlib/Computability/NFA.lean	1	15	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte']	nobody	137-37584 4 months ago	137-37585 4 months ago	45-84611 45 days
22361	rudynicolop author:rudynicolop	feat(Computability/NFA): nfa closure properties	Add the closure properties union, intersection and reversal for NFA. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	218/2	Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean	2	90	['EtienneC30', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	EtienneC30 assignee:EtienneC30	137-36658 4 months ago	137-36660 4 months ago	39-67601 39 days
17458	urkud author:urkud	refactor(Algebra/Group): make `IsUnit` a typeclass	Also change some lemmas to assume `[IsUnit _]` instead of `[Invertible _]`. Motivated by potential non-defeq diamonds in #14986, see also [Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Invertible.20and.20data) I no longer plan to merge this PR, but I'm going to cherry-pick some changes to a new PR before closing this one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-algebra merge-conflict label:t-algebra$	82/72	Mathlib/Algebra/CharP/Invertible.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Units.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/GroupTheory/Submonoid/Inverses.lean,Mathlib/LinearAlgebra/AffineSpace/AffineEquiv.lean,Mathlib/LinearAlgebra/AffineSpace/Combination.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Contraction.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Inversion.lean,Mathlib/LinearAlgebra/CliffordAlgebra/SpinGroup.lean,Mathlib/LinearAlgebra/Eigenspace/Minpoly.lean,Mathlib/NumberTheory/MulChar/Basic.lean,Mathlib/RingTheory/Localization/NumDen.lean,Mathlib/RingTheory/Polynomial/Content.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/Valuation/Basic.lean	26	12	['MichaelStollBayreuth', 'acmepjz', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'urkud']	nobody	90-81727 2 months ago	90-81727 2 months ago	0-66650 18 hours
25218	kckennylau author:kckennylau	feat(AlgebraicGeometry): Tate normal form of elliptic curves	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip new-contributor t-algebraic-geometry merge-conflict	291/26	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Modular/TateNormalForm.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	5	31	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'github-actions', 'grunweg', 'kckennylau', 'leanprover-community-bot-assistant']	nobody	90-80565 2 months ago	90-80566 2 months ago	6-51040 6 days
28298	thorimur author:thorimur	chore: dedent `to_additive` docstrings	This PR uses automation to dedent `to_additive` docstrings throughout Mathlib. It does not lint against indentation or in any way enforce indentation standards for future docstrings. The convention was chosen in accordance with the discussion and polls at [this Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Poll.3A.20Indentation.20style.20for.20.60to_additive.60.20docstrings/with/534285603). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip merge-conflict documentation	949/949	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/Grp/FilteredColimits.lean,Mathlib/Algebra/Category/Grp/Limits.lean,Mathlib/Algebra/Category/Grp/Ulift.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/MonCat/Limits.lean,Mathlib/Algebra/Category/Semigrp/Basic.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/Pi.lean,Mathlib/Algebra/Group/Action/Pointwise/Finset.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Embedding.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Equiv/Opposite.lean,Mathlib/Algebra/Group/Even.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Indicator.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/Pi/Units.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Group/Subgroup/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/BigOperators.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/Group/Units/Opposite.lean,Mathlib/Algebra/Notation/Pi/Basic.lean,Mathlib/Algebra/Opposites.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Group/Cone.lean,Mathlib/Algebra/Order/Group/OrderIso.lean,Mathlib/Algebra/Order/Group/Units.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Submonoid.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Monoid/Units.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Regular/Defs.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Fintype/BigOperators.lean,Mathlib/Data/Set/MulAntidiagonal.lean,Mathlib/Data/Set/SMulAntidiagonal.lean,Mathlib/Data/Vector/Basic.lean,Mathlib/Dynamics/Ergodic/Action/OfMinimal.lean,Mathlib/Dynamics/FixedPoints/Prufer.lean,Mathlib/Geometry/Manifold/Algebra/SmoothFunctions.lean,Mathlib/GroupTheory/Complement.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Coprod/Basic.lean,Mathlib/GroupTheory/Coset/Basic.lean,Mathlib/GroupTheory/Divisible.lean,Mathlib/GroupTheory/EckmannHilton.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/FreeGroup/Reduce.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/FixedPoints.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/Primitive.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean	141	10	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'thorimur']	nobody	50-22659 1 month ago	51-10031 1 month ago	0-61617 17 hours
28803	astrainfinita author:astrainfinita	refactor: unbundle algebra from `ENormed*`	Further speed up the search in the algebraic typeclass hierarchy by avoiding searching for `TopologicalSpace`. This PR continues the work from #23961. - Change `ESeminormed(Add)Monoid` and `ENormed(Add)Monoid` so they no longer carry algebraic data. - Deprecate `ESeminormed(Add)CommMonoid` and `ENormed(Add)CommMonoid` in favor of `ESeminormed(Add)Monoid` and `ENormed(Add)Monoid` with a commutative algebraic typeclass. \|Old\|New\| \|---\|---\| \| `[ESeminormed(Add)(Comm)Monoid E]` \| `[(Add)(Comm)Monoid E] [ESeminormed(Add)Monoid E]` \| \| `[ENormed(Add)(Comm)Monoid]` \| `[(Add)(Comm)Monoid E] [ENormed(Add)Monoid]` \| See [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2328803.20refactor.3A.20unbundle.20algebra.20from.20.60ENormed*.60/with/536024350) ------------ - [x] depends on: #28813	awaiting-zulip slow-typeclass-synthesis t-algebra t-analysis merge-conflict label:t-algebra$	80/63	Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/Normed/Group/InfiniteSum.lean,Mathlib/Analysis/NormedSpace/IndicatorFunction.lean,Mathlib/MeasureTheory/Function/L1Space/AEEqFun.lean,Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean	14	28	['astrainfinita', 'bryangingechen', 'github-actions', 'grunweg', 'kbuzzard', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	grunweg assignee:grunweg	31-9810 1 month ago	31-9811 1 month ago	0-20585 5 hours
17518	grunweg author:grunweg	feat: lint on declarations mentioning `Invertible` or `Unique`	Using the same infrastructure as for #10235. Depends on that PR to land first, and also (for the first lint) a zulip discussion if that change is desired/about the best way to enact it. --- - [ ] depends on: #10235	awaiting-zulip t-linter merge-conflict blocked-by-other-PR	149/7	Mathlib.lean,Mathlib/Algebra/MvPolynomial/PDeriv.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/GroupTheory/Perm/DomMulAct.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/NumberTheory/JacobiSum/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/FundamentalTheorem.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/UnusedAssumptionInType.lean	13	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	335-32170 11 months ago	361-20692 11 months ago *	0-0 0 seconds *
15654	TpmKranz author:TpmKranz	feat(Computability): language-preserving maps between NFA and RE	Map REs to NFAs via Thompson's construction and NFAs to REs using GNFAs Last chunk of #12648 --- - [ ] depends on: #15651 - [ ] depends on: #15649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict blocked-by-other-PR	985/2	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Data/FinEnum/Option.lean,docs/references.bib	7	3	['github-actions', 'leanprover-community-mathlib4-bot', 'meithecatte']	nobody	151-14978 4 months ago	151-14983 4 months ago	0-179 2 minutes

PRs with just a merge conflict

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
12936	mattrobball author:mattrobball	chore(Quiver.Opposite): make `Quiver.Hom.op/unop` `abbrev`'s	These are wrappers around the constructor and projection for `Opposite Quiver.Hom _ _`. The projection itself is reducible and with structure eta built in to defeq it seems like we might be making Lean work harder than is necessary. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	39/34	Mathlib/Algebra/Homology/ShortComplex/Homology.lean,Mathlib/Algebra/Homology/ShortComplex/RightHomology.lean,Mathlib/CategoryTheory/Idempotents/Basic.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Sites/CoverLifting.lean,Mathlib/CategoryTheory/Subobject/Comma.lean,Mathlib/CategoryTheory/Triangulated/Opposite.lean,Mathlib/Combinatorics/Quiver/Basic.lean	10	9	['YaelDillies', 'kim-em', 'leanprover-bot', 'mattrobball']	nobody	429-66283 1 year ago	497-32275 1 year ago	0-0 0 seconds
10721	urkud author:urkud	feat(Order/FunLike): define `PointwiseLE`	- introduce a mixin class `DFunLike.PointwiseLE`, use it to define `DFunLike.instPartialOrder`; - add a generic `DFunLike.orderEmbeddingCoe` - add `DFunLike.PointwiseLE` instances here and there. With this refactor and #13022, I'm going to generalize lemmas like `MeasureTheory.ae_mono` to `OuterMeasureClass`. --- - [x] depends on: #12983 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic t-order merge-conflict	123/50	Mathlib.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/GroupTheory/Congruence.lean,Mathlib/Order/FunLike.lean,Mathlib/Order/Heyting/Hom.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/Bounded.lean,Mathlib/Order/Hom/CompleteLattice.lean,Mathlib/Topology/Order/Hom/Basic.lean	13	48	['YaelDillies', 'dupuisf', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	429-66281 1 year ago	451-46983 1 year ago	64-12826 64 days
8788	FMLJohn author:FMLJohn	feat(Algebra/Module/GradeZeroModule): if `A` is a graded semiring and `M` is a graded `A`-module, then each grade of `M` is a module over the 0-th grade of `A`.	--- - [ ] depends on: #8187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	237/4	Mathlib.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Module/GradeZeroModule.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/Noetherian.lean	6	4	['FMLJohn', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	429-66280 1 year ago	463-54182 1 year ago	0-0 0 seconds
6777	adomani author:adomani	chore(CovariantClass): replace eta-expanded (· ·), (· + ·), (· ≤ ·), (· < ·)	Replace `CovariantClass X X (· * ·) (· ≤ ·)` with -> `CovariantClass X X HMul.hMul LE.le` and similarly for `HAdd`, `LT`, `Contravariant`. This PR is inspired by [Issue #6646](https://github.com/leanprover-community/mathlib4/issues/6646) and, more specifically, [this comment](https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1692792066). Note that https://github.com/leanprover/lean4/pull/2267 would make this unnecessary --- ```bash # First sed command: # the first captured pattern is `CovariantClass ` # the second captured pattern is `` # the third captured pattern is `+` or `` # the fourth captured pattern is `<` or `≤` # a match for `CovariantClass (· ·) (· ·)` becomes # `CovariantClass replaceop replaceop` # Second sed command: similar to the first, but looks for `(Function.swap (· ·))` sed -i ' s=$Co[ntra]variantClass \(..$ \2 \)(· $[+]$ ·) (· $[<≤]$ ·)=\1replaceop\3 replaceop\4=g s=$Co[ntra]variantClass \(..$ \2 \)($[Functio\.swap ]$(· $[+]$ ·)) (· $[<≤]$ ·)=\1(\3replaceop\4) replaceop\5=g s=replaceop+=HAdd.hAdd=g s=replaceop\=HMul.hMul=g s=replaceop<=LT.lt=g s=replaceop≤=LE.le=g s=$Co[ntra]variantClass N N$ (· \ ·) r=\1 HMul.hMul r=g s=$Co[ntra]variantClass N N (swap μ)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass N N$ (swap (· \* ·)) r=\1 (swap HMul.hMul) r=g s=$CovariantClass (Filter α) (Filter α)$ (· / ·) (· ≤ ·)=\1 HDiv.hDiv LE.le=g s=$CovariantClass (Filter α) (Filter α)$ (swap (· / ·)) (· ≤ ·)=\1 (swap HDiv.hDiv) LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· < ·)=\1 LT.lt=g s=$Co[ntra]variantClass [^}]$ (· ≤ ·)=\1 LE.le=g s=$CovariantClass .* (Filter β)$ (· • ·) LE.le=\1 HSMul.hSMul LE.le=g ' $(git ls-files '*.lean') ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	703/678	Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/Bounds.lean,Mathlib/Algebra/CovariantAndContravariant.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/GroupPower/Order.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Archimedean.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/MinMax.lean,Mathlib/Algebra/Order/Group/OrderIso.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Interval.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/LatticeGroup.lean,Mathlib/Algebra/Order/Module.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Cancel/Defs.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Lemmas.lean,Mathlib/Algebra/Order/Monoid/MinMax.lean,Mathlib/Algebra/Order/Monoid/NatCast.lean,Mathlib/Algebra/Order/Monoid/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Prod.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithZero/Basic.lean,Mathlib/Algebra/Order/Monoid/WithZero/Defs.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Pointwise.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Lemmas.lean,Mathlib/Algebra/Order/Sub/Basic.lean,Mathlib/Algebra/Order/Sub/Canonical.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Order/WithZero.lean,Mathlib/Algebra/Parity.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Normed/Order/Lattice.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/List/BigOperators/Basic.lean,Mathlib/Data/List/BigOperators/Lemmas.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Nat/Cast/Order.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/Real/ENNReal.lean,Mathlib/Data/Real/NNReal.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/Data/Sign.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/VectorMeasure.lean,Mathlib/Order/ConditionallyCompleteLattice/Group.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Martingale/Basic.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/PGame.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/NaturalOps.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Topology/ContinuousFunction/Algebra.lean,lean-toolchain,test/Recall.lean,test/propose.lean	81	36	['adomani', 'alreadydone', 'digama0', 'eric-wieser', 'ericrbg', 'jcommelin', 'leanprover-bot', 'sgouezel']	nobody	429-66279 1 year ago	451-46983 1 year ago	35-56459 35 days
6993	jjaassoonn author:jjaassoonn	feat : lemmas about `AddMonoidAlgebra.{divOf, modOf}`	--- - [x] depends on: #7582 - [x] depends on: #8975 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	147/3	Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/MvPolynomial/Basic.lean,Mathlib/Data/MvPolynomial/CommRing.lean,Mathlib/Data/MvPolynomial/Division.lean	5	42	['YaelDillies', 'alreadydone', 'digama0', 'eric-wieser', 'github-actions', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	429-66278 1 year ago	451-46983 1 year ago	102-21189 102 days
6491	eric-wieser author:eric-wieser	chore(Mathlib/Algebra/Hom/GroupAction): add `SMulHomClass.comp_smul`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	24/10	Mathlib/Algebra/Hom/GroupAction.lean	1	0	[]	nobody	429-66278 1 year ago	451-46983 1 year ago	83-76369 83 days
10629	madvorak author:madvorak	feat: List.cons_sublist_append_iff_right	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	11/0	Mathlib/Data/List/Basic.lean	1	1	['eric-wieser']	nobody	415-59823 1 year ago	415-59823 1 year ago	53-73442 53 days
13791	digama0 author:digama0	refactor: Primrec and Partrec	General cleanup of the `Primrec` and `Partrec` files, to better adjust to lean 4 things. The main user-visible change is that `Primrec₂` is no longer a `def` but an `abbrev`, because it was causing inference issues in lean 4. I also removed all the nonterminal `simp`s in `PartrecCode.lean`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-computability merge-conflict	585/778	Mathlib/Computability/Ackermann.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/Primrec.lean	5	2	['github-actions', 'grunweg']	nobody	411-22668 1 year ago	451-46983 1 year ago	1-84718 1 day
11964	adamtopaz author:adamtopaz	feat: The functor of points of a scheme	We construct the functor of points functor, and prove that it's full and faithful. --- - [ ] depends on: #11947 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-category-theory merge-conflict	210/0	Mathlib.lean,Mathlib/AlgebraicGeometry/FunctorOfPoints.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean	3	4	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	411-22527 1 year ago	451-46983 1 year ago	0-1223 20 minutes
12418	rosborn author:rosborn	style: replace preimage_val with ↓∩ notation	--- This is a rough draft of what the new `↓∩` notation would look like within mathlib. I believe this is an improvement in clarity and would like to have `↓∩` as a standard notation (along with `''`, `⁻¹'`, `↑`, etc...). As `↓∩` is specialized for `Set`s, I have only changed `preimage_val` when the left-hand side of `↓∩` is a `Set`. The introduction of the `↓∩` notation to Data.Set.Image is temporary as it isn't possible to import Data.Set.Subset directly. If we want `↓∩` unscoped, where would be the best place to define it? An option is Data.Set.Defs, but the notation cannot be defined without additional imports as the file does not import `notation3`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	56/61	Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Subset.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/LocalAtTarget.lean,Mathlib/Topology/LocallyConstant/Basic.lean,Mathlib/Topology/Separation.lean,Mathlib/Topology/Sober.lean	18	3	['grunweg', 'rosborn']	nobody	411-22426 1 year ago	451-46983 1 year ago	29-14218 29 days
12751	Command-Master author:Command-Master	feat: add lemmas for Nat/Bits, Nat/Bitwise and Nat/Size	Remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict	66/7	Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Size.lean	4	26	['Command-Master', 'Rida-Hamadani', 'Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'jcommelin']	nobody	410-43580 1 year ago	415-59822 1 year ago	54-52408 54 days
16464	Parcly-Taxel author:Parcly-Taxel	chore: deprecate `Nat.(case_)strong_induction_on`	…in favour of the now-renamed `Nat.(case)strongInductionOn` in core.	tech debt merge-conflict	54/56	Archive/Imo/Imo1981Q3.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Hofer.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Derangements/Finite.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/SetFamily/AhlswedeZhang.lean,Mathlib/Computability/Primrec.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Nat/Defs.lean,Mathlib/Data/Nat/Digits.lean,Mathlib/Data/Nat/Log.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/LinearAlgebra/Eigenspace/Triangularizable.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/NumberTheory/BernoulliPolynomials.lean,Mathlib/NumberTheory/DiophantineApproximation.lean,Mathlib/NumberTheory/Pell.lean,Mathlib/NumberTheory/Primorial.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/RingTheory/Adjoin/PowerBasis.lean,Mathlib/RingTheory/LittleWedderburn.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean,Mathlib/RingTheory/Polynomial/Eisenstein/IsIntegral.lean,Mathlib/RingTheory/Polynomial/Nilpotent.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/QuotientNilpotent.lean,Mathlib/RingTheory/WittVector/Defs.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/StructurePolynomial.lean,Mathlib/SetTheory/Surreal/Dyadic.lean,Mathlib/Topology/Metrizable/Uniformity.lean	43	13	['Parcly-Taxel', 'b-mehta', 'github-actions', 'jcommelin']	nobody	378-32136 1 year ago	378-32136 1 year ago	8-1989 8 days
17127	FR-vdash-bot author:FR-vdash-bot	chore: remove global `Quotient.mk` `⟦·⟧` notation	--- Merge this PR when we are ready to migrate to `QuotLike` API (#16421). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	137/2	Counterexamples/Pseudoelement.lean,Mathlib/Algebra/Associated/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Order/CauSeq/Completion.lean,Mathlib/Algebra/Quandle.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Product.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/CategoryTheory/Abelian/Pseudoelements.lean,Mathlib/CategoryTheory/Limits/Shapes/SingleObj.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Fintype/List.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/QPF/Multivariate/Constructions/Fix.lean,Mathlib/Data/QPF/Univariate/Basic.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Set/Finite.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/ModelTheory/Quotients.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/RepresentationTheory/Action/Concrete.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Ordinal.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/Birthday.lean,Mathlib/SetTheory/Game/Impartial.lean,Mathlib/SetTheory/Game/Ordinal.lean,Mathlib/SetTheory/Game/State.lean,Mathlib/SetTheory/Lists.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Surreal/Basic.lean,Mathlib/SetTheory/Surreal/Dyadic.lean,Mathlib/SetTheory/Surreal/Multiplication.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Rank.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Homotopy/Product.lean,Mathlib/Topology/MetricSpace/GromovHausdorff.lean,Mathlib/Topology/UniformSpace/Separation.lean,test/interactiveUnfold.lean	68	1	['github-actions']	nobody	368-80919 1 year ago	368-80919 1 year ago	4-72805 4 days
8029	alreadydone author:alreadydone	refactor: Homotopy between Functions not ContinuousMaps	This allows talking about homotopies without needing to supply proofs of continuity for the two ends. This for example simplifies the definition of H-spaces. Of course, if a homotopy exists between two functions, those two functions are automatically continuous because they are restrictions of the homotopy (which is continuous) to subspaces. `Homotopy.refl` still needs a continuous map as input, and `Homotopic` is only an equivalence relation when restricted to ContinuousMap. --- TODO: fix docstrings [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology RFC merge-conflict	246/250	Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/Topology/Homotopy/Basic.lean,Mathlib/Topology/Homotopy/Contractible.lean,Mathlib/Topology/Homotopy/Equiv.lean,Mathlib/Topology/Homotopy/HSpaces.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Homotopy/Product.lean	8	3	['alreadydone', 'urkud']	nobody	359-23324 11 months ago	451-46983 1 year ago	9-20043 9 days
14598	Command-Master author:Command-Master	chore: add typeclasses to unify various `add_top`, `add_eq_top`, etc.	Add the four typeclasses `IsTopAbsorbing`, `IsBotAbsorbing`, `NoTopSum`, `NoBotSum`, as additive equivalents for `MulZeroClass` and `NoZeroDivisors`. Add instances of these for `ENNReal`, `WithTop α`, `WithBot α`, `PUnit`, `EReal`, `PartENat`, `Measure`, `Interval` and `Filter`. Also split `Algebra/Order/AddGroupWithTop` to `Algebra/Order/Group/WithTop` and `Algebra/Order/Monoid/WithTop` --- Previous usages of lemmas with quantified names like `WithTop.add_top` have to be changed to just `add_top`. `add_lt_top` is `@[simp]`, in accordance with `ENNReal.add_lt_top` being `@[simp]`. This affects `WithTop.add_lt_top` which previously hadn't been `@[simp]`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order t-algebra merge-conflict label:t-algebra$	264/195	Archive/Wiedijk100Theorems/BallotProblem.lean,Mathlib.lean,Mathlib/Algebra/Order/Group/WithTop.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/PUnitInstances/Order.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Analytic/Meromorphic.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/NormedSpace/ENorm.lean,Mathlib/Analysis/SpecialFunctions/JapaneseBracket.lean,Mathlib/Analysis/SpecialFunctions/Log/ENNRealLog.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Nat/WithBot.lean,Mathlib/Data/Real/EReal.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Decomposition/Lebesgue.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSpace.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean,Mathlib/MeasureTheory/Integral/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Martingale/Convergence.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/UniqueFactorizationDomain.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/MetricSpace/Lipschitz.lean	57	30	['Command-Master', 'YaelDillies', 'github-actions']	nobody	331-76385 10 months ago	331-76385 10 months ago	7-45599 7 days
12778	MichaelStollBayreuth author:MichaelStollBayreuth	perf: decouple algebraic and order hierarchies in type class search	Based on the experience gained with [#12680](https://github.com/leanprover-community/mathlib4/pull/12680), this attempts to decouple the algebraic and order hierarchies in type class search. * We lower the priorities of instances like `OrderedSemiring.toSemiring` (which are generated by the `extends` clause with default priority 1000) to 50. * Additionally, we make the default priority available via `open scoped AlgebraOrderInstances` and use that where appropriate. Motivation: Looking at instance synthesization traces, it appears that when (e.g.) presented with the goal to find a `Semiring` instance, the algorithm frequently goes down a rabbit hole trying and failing to find order instances. This seems to be caused by the presence of instances like `OrderedSemiring.toSemiring` with default priority, which are tried early in the search, but lead nowhere (after a fairly long time). These instances are created by declarations of the form ```lean class OrderedSemiring (α : Type u) extends Semiring α, OrderedAddCommMonoid α where ... ``` which automatically sets up (among other things) an instance `OrderedSemiring.toSemiring` with default piority. It appears that these instances cannot be removed completely (only locally in a module), so the next best solution is to make them low priority (which is possible also for downstream modules). To provide for situations where these instances are desired, we put a default priority version in the scope `AlgebraOrderInstances`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-order t-algebra merge-conflict label:t-algebra$	306/27	Mathlib/Algebra/Algebra/Subalgebra/Order.lean,Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/Submodule/Order.lean,Mathlib/Algebra/Order/AbsoluteValue.lean,Mathlib/Algebra/Order/Algebra.lean,Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/BigOperators/Group/Finset.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/BigOperators/Group/Multiset.lean,Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/BigOperators/Ring/List.lean,Mathlib/Algebra/Order/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Field/Pi.lean,Mathlib/Algebra/Order/Floor.lean,Mathlib/Algebra/Order/Floor/Div.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/Units.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Interval/Set/Instances.lean,Mathlib/Algebra/Order/Invertible.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Module/Algebra.lean,Mathlib/Algebra/Order/Module/Defs.lean,Mathlib/Algebra/Order/Module/Pointwise.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Prod.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Order/Positive/Field.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/InjSurj.lean,Mathlib/Algebra/Order/Ring/Pow.lean,Mathlib/Algebra/Order/Sub/WithTop.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Analysis/Convex/Cone/Closure.lean,Mathlib/Analysis/Convex/Cone/Pointed.lean,Mathlib/Analysis/Convex/Cone/Proper.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convex/Extrema.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/GaugeRescale.lean,Mathlib/Analysis/Convex/Hull.lean,Mathlib/Analysis/Convex/Join.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/SpecificFunctions/Pow.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/Convex/Strict.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Polynomials.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Optimization/ValuedCSP.lean,Mathlib/Combinatorics/Pigeonhole.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/DFinsupp/Multiset.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/MulAntidiagonal.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Int/Log.lean,Mathlib/Data/Multiset/Antidiagonal.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Nat/Cast/Field.lean,Mathlib/Data/Nat/Cast/Order/Basic.lean,Mathlib/Data/Nat/Choose/Bounds.lean,Mathlib/Data/PNat/Factors.lean,Mathlib/Data/Rat/Denumerable.lean,Mathlib/Data/Set/Pointwise/Interval.lean	135	34	['MichaelStollBayreuth', 'YaelDillies', 'github-actions', 'leanprover-bot']	nobody	331-75288 10 months ago	331-75288 10 months ago	18-19513 18 days
19212	Julian author:Julian	feat(LinearAlgebra): add a variable_alias for VectorSpace	Taken directly from the variable_alias docs. Zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/why.20.5Bvariable_alias.5D.20attribute.20is.20not.20used.20in.20Mathlib.3F --- This is the first actual variable alias added to mathlib. I haven't reviewed variable_alias fully, but it seems like there's at least 3 ways they could be distributed in Mathlib: * alongside whatever subfolder they "belong to" (which is what I've tentatively done here) * In a file called `Aliases` somewhere near the thing they alias (which seems less discoverable to me) * In a single file, a la `Mathlib.TrainingWheels` (with some less playful name) which is meant to define a bunch of more "friendly" aliases all in one place. I kind of like the idea of the third thing as a future module but perhaps it can be synthesized if/when there are more aliases? For now as I say I've done the first one, but please let me know if someone prefers something else. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	25/0	Mathlib.lean,Mathlib/LinearAlgebra/VectorSpace.lean,scripts/noshake.json	3	10	['Julian', 'PieterCuijpers', 'github-actions', 'urkud']	nobody	311-53140 10 months ago	311-53140 10 months ago	7-68492 7 days
19337	zeramorphic author:zeramorphic	feat(Data/Finsupp): generalise `Finsupp` to any "zero" value	Remove the explicit dependence of `Finsupp` on `[Zero M]`, instead defining `Finsupp'` (better name pending) to be functions that are equal to a fixed value `z : M` cofinitely often. This PR is intended to do the initial work of replacing the definition of `Finsupp` with an instantiation of the more general definition, without adding any appropriate API. If accepted, the API development will follow in later PRs. Issues to consider: - Naming of `Finsupp'.` - Where should `Finsupp'` lemmas go? Do they need their own file/folder under `Data/`? Relevant Zulip threads: - https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Finsupp.20generalisations - https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Finsupp-like.20partial.20function Comments are welcome. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	203/83	Archive/Wiedijk100Theorems/Partition.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Rename.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/Defs.lean,Mathlib/RingTheory/PowerBasis.lean,scripts/nolints_prime_decls.txt	13	5	['github-actions', 'vihdzp', 'zeramorphic']	nobody	309-29217 10 months ago	309-29217 10 months ago	4-60621 4 days
18756	astrainfinita author:astrainfinita	refactor: deprecate `DistribMulActionSemiHomClass` `MulSemiringActionSemiHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	50/28	Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/GroupTheory/GroupAction/Hom.lean	3	4	['astrainfinita', 'github-actions', 'leanprover-bot']	nobody	297-81286 9 months ago	297-81286 9 months ago	31-75259 31 days
18748	FR-vdash-bot author:FR-vdash-bot	refactor: deprecate `ContinuousLinearMapClass`	--- - [ ] depends on: #18689 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	115/49	Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,Mathlib/Topology/Homeomorph.lean	10	5	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	291-45299 9 months ago	291-45302 9 months ago	0-989 16 minutes
20527	trivial1711 author:trivial1711	refactor(Topology/UniformSpace/Completion): more descriptive names for `α → Completion α`	- We rename the various maps `α → Completion α` in order to make their names more consistent. - Let `α` be a uniform space. We rename the uniformly continuous function `α → Completion α` from `UniformSpace.Completion.coe'` to `UniformSpace.Completion.coe`. - Let `α` be a uniform additive group. We rename the additive group homomorphism `α →+ Completion α` from `UniformSpace.Completion.toCompl` to `UniformSpace.Completion.coeAddHom`. - Let `α` be a uniform ring. The ring homomorphism `α →+* Completion α` is called `UniformSpace.Completion.coeRingHom`; its name is unchanged. - Let `α` be a normed space over a field `𝕜`. We rename the linear isometry `α →ₗᵢ[𝕜] Completion α` from `UniformSpace.Completion.toComplₗᵢ` to `UniformSpace.Completion.coeₗᵢ`. - Let `α` be a normed space over a field `𝕜`. We rename the continuous linear map `α →L[𝕜] Completion α` from `UniformSpace.Completion.toComplL` to `UniformSpace.Completion.coeL`. - Let `α` be a normed additive group. We rename the norm preserving homomorphism `NormedAddGroupHom α (Completion α)` from `NormedAddCommGroup.toCompl` to `UniformSpace.Completion.coeNormedAddGroupHom`. - We analogously rename some other theorems. - We add some trivial theorems (all of which are proved by `rfl`) that state that the functions considered above are equal. We give all of them the `simp` and `norm_cast` attributes. - We add a new theorem `UniformSpace.Completion.coeAddHom_eq_coe` that states that `UniformSpace.Completion.coeAddHom` and `UniformSpace.Completion.coe` are equal as functions. - We similarly add a new theorem `UniformSpace.Completion.coeRingHom_eq_coe`. - We rename the theorem `UniformSpace.Completion.coe_toComplₗᵢ` to `UniformSpace.Completion.coeₗᵢ_eq_coe`. - We rename the theorem `UniformSpace.Completion.coe_toComplL` to `UniformSpace.Completion.coeL_eq_coe`. - We similarly add a new theorem `UniformSpace.Completion.coeNormedAddGroupHom_eq_coe`. - We change all occurrences of the string `((↑) : α → Completion α)` to `(coe : α → Completion α)` or just `coe`. - We put the statements of some theorems into simp normal form by using the plain function `coe` rather than the homomorphisms that carry more structure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	130/92	Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Complex/AbsMax.lean,Mathlib/Analysis/Complex/Liouville.lean,Mathlib/Analysis/InnerProductSpace/Completion.lean,Mathlib/Analysis/Normed/Group/HomCompletion.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/Analysis/SpecialFunctions/NonIntegrable.lean,Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/Nonarchimedean.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Algebra/UniformRing.lean,Mathlib/Topology/Category/UniformSpace.lean,Mathlib/Topology/MetricSpace/Completion.lean,Mathlib/Topology/UniformSpace/Completion.lean	17	4	['eric-wieser', 'github-actions', 'trivial1711']	nobody	263-42092 8 months ago	263-42092 8 months ago	6-66637 6 days
18474	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `WithOne.to` instances	--- From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data slow-typeclass-synthesis t-algebra merge-conflict label:t-algebra$	9/2	Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean	3	7	['FR-vdash-bot', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	261-29122 8 months ago	261-29122 8 months ago	76-67978 76 days
20372	jvlmdr author:jvlmdr	feat(MeasureTheory/Function): Add ContinuousLinearMap.bilinearCompLp(L)	Introduce ContinuousLinearMap.bilinearCompLp and bilinearCompLpL. Generalize eLpNorm_le_eLpNorm_mul_eLpNorm theorems to include constant C in bound condition. --- Expect this may be useful for defining tempered distributions from functions in `L^p`. The definitions more or less follow `ContinuousLinearMap.compLp...`. Names are loosely analogous to `ContinuousLinearMap.bilinearComp` and `SchwartzMap.bilinLeftCLM`. Note: I preferred the spelling `hpqr : p⁻¹ + q⁻¹ = r⁻¹` with `f` in `L^p` and `g` in `L^q` to `hpqr : 1 / p = 1 / q + 1 / r`. It's easier to obtain from `ENNReal.IsConjExponent` too. A few questions: - [ ] I defined `bilinear{Left,Right}LpL` in addition to `bilinearCompLpL` because `LinearMap.mkContinuous₂` is marked as `noncomputable` and `LinearMap.mkContinuous` is not. Is this worth the extra definitions? (Note: This is not visible in the source due to `noncomputable section`.) - [ ] Should I use `C : ℝ` instead of `C : NNReal` for `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'`? - [ ] Is it going to be painful to have `[Fact (1 ≤ p)] [Fact (1 ≤ q)] [Fact (1 ≤ r)]`? I don't think there's a way to avoid it though. Maybe providing specialized versions for `p.IsConjExponent q` with `L^1`? Naming: - [ ] Is it satisfactory to add a `'` to the `eLpNorm_le_eLpNorm_mul_eLpNorm ` definitions in `CompareExp.lean` where `≤ ‖f x‖ * ‖g x‖` has been replaced with `≤ C * ‖f x‖ * ‖g x‖`? These could replace the existing theorems, although I don't want to break backwards compatibility. There are 5 instances: `eLpNorm_le_eLpNorm_top_mul_eLpNorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm_top'`, `eLpNorm'_le_eLpNorm'_mul_eLpNorm''`, `eLpNorm_le_eLpNorm_mul_eLpNorm_of_nnnorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'` (I'm not sure why the existing theorem `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm` has an internal `'`) - [ ] Is `bilinearLeftLpL` a suitable name? Other options: `bilinearCompLpLeftL`, `bilinearCompLeftLpL`, `bilinLeftLpL` (analogous to `SchwartzMap.bilinLeftCLM`) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict	203/40	Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace.lean	2	1	['github-actions']	nobody	248-53379 8 months ago	248-53379 8 months ago	27-43617 27 days
18463	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Notation/FundamentalSequence): define type of fundamental sequences	We define `Sequence α` as the type of sequences with length 0, 1, or `ω`, and give a basic API. A subsequent PR will introduce the notion of a (countable and computable) fundamental sequence and establish basic results. The goal of this is to generalize [`ONote.fundamentalSequence`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/SetTheory/Ordinal/Notation.html#ONote.fundamentalSequence) to allow the construction of fundamental sequences for other ordinal notations. --- See [my ordinal notation repository](https://github.com/vihdzp/ordinal-notation/blob/a6fdd7fe7cb521e686ea271902e7e5496f1804d3/OrdinalNotation/Cantor.lean#L1218) for a demonstration of how this API looks in practice. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-order merge-conflict	174/1	Mathlib.lean,Mathlib/SetTheory/Ordinal/Notation/Cantor.lean,Mathlib/SetTheory/Ordinal/Notation/FundamentalSequence.lean	3	19	['YnirPaz', 'b-mehta', 'github-actions', 'vihdzp']	nobody	226-77521 7 months ago	226-77521 7 months ago	52-25108 52 days
21099	chrisflav author:chrisflav	chore(RingTheory/Generators): use unification hints for variables and relations	When working with generators and presentations, we rely on the `MvPolynomial` API, but since the type of variables is bundled in `Generators R S`, many lemmas don't apply with `rw` or `simp`, because they can't see through the definition of `vars` in constructions such as `Generators.comp` and `Generators.localizationAway`. A possible approach is to make all of these constructions `abbrev`s, but this causes `simp` to also unfold `val` which is not always desirable. More generally, it is then harder to predict how instance search and `simp` behave. This approach is tried in #21050, but causes many regressions. This approach is less invasive, as it uses `unif_hint` to unify the `vars` (and `rels`) fields of constructions with the correct type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	231/91	Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/RingTheory/Generators.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/Presentation.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean	5	16	['chrisflav', 'erdOne', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	222-36357 7 months ago	222-36357 7 months ago	27-75210 27 days
21339	vihdzp author:vihdzp	fix(Data/List/Lex): remove duplicate `List.LE` instance	Mathlib currently duplicates the Lean core instance for `≤` in lists in an incompatible way. We delete this duplicate instance. See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Two.20.60List.2ELE.60.20instances.3F/near/497241115). --- This is a very quick and dirty fix. Core Lean provides all of the theorems we need to prove `≤` forms a linear order, but it provides them in terms of `Std` relation typeclasses which currently see no use in Mathlib. I've added the instances that were required to get the list theorems working. In the future, we really ought to unify the core and Mathlib relation typeclasses. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	24/22	Mathlib/Data/List/Lex.lean,Mathlib/Data/String/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean	3	1	['github-actions']	nobody	214-35249 7 months ago	214-35249 7 months ago	16-65973 16 days
21959	BGuillemet author:BGuillemet	feat(Topology/ContinuousMap): Stone-Weierstrass theorem for MvPolynomial	Add the subalgebra of multivariate polynomials and prove it separates points, on the same model as `ContinuousMap/Polynomial.lean`. Prove the Stone-Weierstrass theorem and some variations for multivariate polynomials. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology merge-conflict	285/1	Mathlib.lean,Mathlib/Topology/ContinuousMap/MvPolynomial.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	3	1	['github-actions']	nobody	212-39400 6 months ago	212-39400 6 months ago	16-76141 16 days
22660	Ruben-VandeVelde author:Ruben-VandeVelde	chore: follow naming convention around Group.IsNilpotent	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	133/67	Mathlib/GroupTheory/Frattini.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/SpecificGroups/ZGroup.lean	3	1	['github-actions']	nobody	200-61655 6 months ago	200-61655 6 months ago	10-48025 10 days
22027	vihdzp author:vihdzp	chore(SetTheory/Ordinal/FixedPoint); review `Ordinal.nfp` API	This PR does the following: - add `iff` variants of various theorems, renaming some in the process - weaken some assumptions slightly - golf throughout --- - [x] depends on: #22017 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	64/61	Mathlib/Logic/Equiv/List.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean	2	3	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	181-19407 5 months ago	183-72767 6 months ago	43-68322 43 days
22701	ctchou author:ctchou	feat(Combinatorics): the Katona circle method	This file formalizes the Katona circle method. From PlainCombi (LeanCamCombi): https://github.com/YaelDillies/LeanCamCombi/blob/master/LeanCamCombi/PlainCombi/KatonaCircle.lean Co-authored-by: Yaël Dillies	new-contributor t-combinatorics merge-conflict	121/0	Mathlib.lean,Mathlib/Combinatorics/KatonaCircle.lean	2	1	['github-actions']	nobody	180-15169 5 months ago	180-15169 5 months ago	30-8337 30 days
23411	PatrickMassot author:PatrickMassot	chore: remove finiteness from Order.Filter.Lift	Co-authored-by: Anatole Dedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	longest-pole t-topology merge-conflict	48/21	Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Order/Filter/Lift.lean,Mathlib/Order/Filter/SmallSets.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Basic.lean	7	4	['Vierkantor', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	178-61883 5 months ago	178-81452 5 months ago	10-21608 10 days
21488	imbrem author:imbrem	feat(CategoryTheory/Monoidal): premonoidal categories	Add support for premonoidal categories --- Still want to add support for: - Premonoidal braided/symmetric categories - The monoidal coherence theorem, which I've already ported in my `discretion` library - The `coherence` tactic, which should work fine for premonoidal categories too but wanted to get this in front of reviewers ASAP to make sure my general approach was alright [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory merge-conflict	900/361	Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/CoherenceLemmas.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,MathlibTest/StringDiagram.lean	21	9	['YaelDillies', 'github-actions', 'grunweg', 'imbrem', 'kim-em', 'leanprover-community-bot-assistant']	nobody	177-47802 5 months ago	177-47803 5 months ago	58-20339 58 days
21525	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Prelim)	This PR defines the basic preliminaries for defining locally cartesian closed categories (LCCCs). In particular, using the calculus of mates we define certain natural isomorphisms involving `Over.star` and `Over.pullback` which will be crucial in defining the right adjoint to the pullback functor in the development of LCCCs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict	338/24	Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Galois/Examples.lean	3	13	['b-mehta', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'sinhp']	nobody	177-47800 5 months ago	177-47802 5 months ago	43-83249 43 days
16314	FR-vdash-bot author:FR-vdash-bot	chore(Data/Quot): deprecate `ind*'` APIs	--- - [x] depends on: #16264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	247/287	Counterexamples/CliffordAlgebraNotInjective.lean,Mathlib/Algebra/Colimit/Module.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/CategoryTheory/ConnectedComponents.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Computability/Reduce.lean,Mathlib/Computability/Tape.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/Multiset/MapFold.lean,Mathlib/Data/Multiset/ZeroCons.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/FieldTheory/Fixed.lean,Mathlib/GroupTheory/Complement.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/Hom.lean,Mathlib/GroupTheory/Coset/Basic.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/GroupTheory/PresentedGroup.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/GroupTheory/SchurZassenhaus.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Category/PartOrd.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Hilbert90.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Functoriality.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Valuation/Quotient.lean,Mathlib/Topology/Algebra/Group/TopologicalAbelianization.lean,Mathlib/Topology/Algebra/InfiniteSum/Module.lean,Mathlib/Topology/Separation/Basic.lean	65	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	171-72766 5 months ago	171-72768 5 months ago	55-52030 55 days
15483	FR-vdash-bot author:FR-vdash-bot	chore(GroupTheory/Coset): reduce defeq abuse	--- - [x] depends on: #15482 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	114/60	Mathlib/GroupTheory/Commensurable.lean,Mathlib/GroupTheory/Coset.lean,Mathlib/GroupTheory/QuotientGroup.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/MeasureTheory/Measure/Haar/Quotient.lean,Mathlib/Topology/Algebra/Group/Compact.lean	6	14	['FR-vdash-bot', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball', 'mergify', 'urkud']	nobody	171-17659 5 months ago	419-55989 1 year ago	4-79214 4 days
20567	grunweg author:grunweg	feat(Cache): two small features	- add an informational message to the get command (when run without arguments): when more than 80% of all cache files present were not used in the last command, tell the user about the `clean` command --- - [ ] depends on #20568 (for the first feature) - [ ] TODO: re-design this feature and the clean command: if there are N local copies of mathlib, cache should have a pointer to all of them - to avoid clearing all N-1 from inside the last local copy [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	38/2	Cache/Main.lean	1	11	['Julian', 'arthurpaulino', 'fpvandoorn', 'github-actions', 'grunweg']	nobody	169-21762 5 months ago	169-21762 5 months ago	1-17369 1 day
23859	urkud author:urkud	feat(Topology/../Order/Field): generalize to `Semifield`	.. from a linear ordered field to a linear ordered semifield--- - [ ] depends on: #23857 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	245/219	Mathlib/Algebra/Order/Group/Pointwise/Interval.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Topology/Algebra/Order/Field.lean,Mathlib/Topology/Order/Basic.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	164-60676 5 months ago	164-60679 5 months ago	0-265 4 minutes
23810	b-reinke author:b-reinke	chore(Order/Interval): generalize succ/pred lemmas to partial orders	Many lemmas in `Mathlib/Order/Interval/Set/SuccPred.lean`and `Mathlib/Order/Interval/Finset/SuccPred.lean` also work for partial orders. They are generalized in this PR by introducing different sections for `PartialOrder` and `LinearOrder` assumptions in the respective files. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	231/89	Mathlib/Order/Interval/Finset/SuccPred.lean,Mathlib/Order/Interval/Set/SuccPred.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	162-37451 5 months ago	162-37453 5 months ago	16-29623 16 days
24285	madvorak author:madvorak	chore(Algebra/*-{Category,Homology}): remove unnecessary universe variables	Discussions: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Call.20for.20help.3A.20technical.2F.20organisational.20debt/with/513620128 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Algebra.20and.20.60Type.60/with/513558902 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Task.2026.3A.20Replace.20Type.20u.20by.20Type.20wherever.20possible/with/513592993 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	542/916	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Field.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Central/Basic.lean,Mathlib/Algebra/Central/Defs.lean,Mathlib/Algebra/Central/TensorProduct.lean,Mathlib/Algebra/CharP/Pi.lean,Mathlib/Algebra/CharP/Quotient.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Finsupp.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/Algebra/Field/MinimalAxioms.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/FreeNonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Finite.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Invertible/Defs.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/TypeTags/Finite.lean,Mathlib/Algebra/Group/TypeTags/Hom.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/Group/WithOne/Basic.lean,Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Pi.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/NeZero.lean,Mathlib/Algebra/Lie/Abelian.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/CartanMatrix.lean,Mathlib/Algebra/Lie/CartanSubalgebra.lean,Mathlib/Algebra/Lie/Character.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/DirectSum.lean,Mathlib/Algebra/Lie/Free.lean,Mathlib/Algebra/Lie/Ideal.lean,Mathlib/Algebra/Lie/IdealOperations.lean,Mathlib/Algebra/Lie/Matrix.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/NonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Solvable.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/Algebra/Lie/UniversalEnveloping.lean,Mathlib/Algebra/Module/Basic.lean,Mathlib/Algebra/Module/CharacterModule.lean,Mathlib/Algebra/Module/DedekindDomain.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/Equiv/Opposite.lean,Mathlib/Algebra/Module/Lattice.lean,Mathlib/Algebra/Module/LinearMap/Basic.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/MinimalAxioms.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Module/Opposite.lean,Mathlib/Algebra/Module/Pi.lean,Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/CommRing.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean	182	22	['erdOne', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'madvorak', 'mattrobball']	nobody	162-26148 5 months ago	162-26149 5 months ago	2-12022 2 days
24354	grunweg author:grunweg	chore(HasFiniteIntegral): rename three lemmas	Discovered in #24343. --- - [ ] depends on: #24343 (to avoid merge conflicts) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict	108/30	Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	157-30552 5 months ago	157-30553 5 months ago	0-4604 1 hour
13649	FR-vdash-bot author:FR-vdash-bot	chore: redefine `Nat.div2` `Nat.bodd`	The new definitions are faster than the old ones. `Nat.binaryRec` will be moved to batteries (https://github.com/leanprover-community/batteries/pull/799) or core (https://github.com/leanprover/lean4/pull/3756), so relevant contents are moved to a new file temporarily. --- - [x] depends on: #15567 - [x] depends on: #19666 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	63/88	Mathlib/Computability/Primrec.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Size.lean,Mathlib/Logic/Denumerable.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Nat.lean	8	15	['FR-vdash-bot', 'digama0', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	digama0 assignee:digama0	154-9698 5 months ago	154-9700 5 months ago	87-51692 87 days
4979	mhk119 author:mhk119	doc(Data/Nat/Bitblast): initial commit	Initial commit of Bitblast.lean where we prove equivalence of bitblast unsigned less than and bitblast addition. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	202/4	Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Pow.lean	3	49	['ChrisHughes24', 'digama0', 'goens', 'grunweg', 'j-loreaux', 'kim-em', 'mhk119']	nobody	153-67933 5 months ago	153-67933 5 months ago	7-68358 7 days
23546	JovanGerb author:JovanGerb	feat(LinearAlgebra/AffineSpace/AffineSubspace): rename `AffineSubspace.mk'` to `Submodule.shift`	In addition to renaming, I've refactored the code a bit: - `mem_mk'_iff_vsub_mem` was obsolete since it was the same as `mem_mk'`, so I removed it (this is due to a change in the definition I made recently) - I added a nonempty instance for `shift` - I added a simp lemma that `shift` isn't equal to `⊥` (the empty affine subspace). I need this for the next point. - Edit: I'll leave this for a later PR. ~I proved a simp lemma that a `shift` is parallel to a `shift` if and only if the linear subspaces are the same.~ - I renamed `mk'_eq` to `shift_direction_eq_self `. - I renamed `eq_or_eq_secondInter_of_mem_mk'_span_singleton_iff_mem` to `eq_or_eq_secondInter_iff_mem_of_mem_shift_span_singleton`. I think it is better to put the `of_mem_mk'_span_singleton` at the end of the name. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry merge-conflict	128/99	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Geometry/Euclidean/Basic.lean,Mathlib/Geometry/Euclidean/MongePoint.lean,Mathlib/Geometry/Euclidean/PerpBisector.lean,Mathlib/Geometry/Euclidean/Sphere/SecondInter.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean	7	4	['JovanGerb', 'github-actions', 'leanprover-community-bot-assistant']	nobody	152-42680 4 months ago	152-42681 4 months ago	26-25420 26 days
9273	grunweg author:grunweg	feat: extended charts are local diffeomorphisms on their source	--- TODO: I think this should hold at any interior point - as the inverse of the extended chart, restricted to the interior of its source, will be a local inverse. The analogous result for un-extended charts is shown in #8160. Unresolved questions - are all the tiny API lemmas useful; are any more missing? - do I want similar results for `extChartAt`? (In any case, they are easy to deduce.) - [ ] depends on: #8738 for simplicity [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict	225/12	Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Topology/Algebra/Module/Basic.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	148-18088 4 months ago	unknown	unknown
22837	joneugster author:joneugster	feat(Data/Set/Basic): add subset_iff and not_mem_subset_iff	Add `Set.subset_iff` for consistent API with `Finset.subset_iff`. Add `Set.not_mem_subset_iff` and `Finset.not_mem_subset_iff`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-data merge-conflict	9/0	Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Set/Basic.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant']	nobody	131-45680 4 months ago	131-45682 4 months ago	30-35190 30 days
21476	grunweg author:grunweg	feat(lint-style): enable running on downstream projects	Enable lint-style to run on downstream projects, by making the following modifications: - allow passing an explicit list of libraries to lint: if nothing is passed, it lints `Mathlib`, `Archive` and `Counterexamples` (as before); otherwise, it lints precisely the passed modules - only check init imports, undocumented scripts and the errors from `lint-style.py` when linting Mathlib - make the style exceptions file configurable and optional: using the `nolints-file` flag, the exceptions file can be configured. If the flag is omitted, we try to find a file at `scripts/nolints-style.txt` --- and otherwise proceed with no style exceptions. This means mathlib can continue unchanged, and downstream projects can either add an explicit exceptions file, or proceed without any exceptions. After this PR, one should be able to run lint-style on a downstream project by `lake exe lint-style ProjectName`. Prompted by [this zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/lint-style.20for.20downstream.20libraries). --- - [ ] depends on: #24570 - [ ] depends on: #24953 (I did not test the last part.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	58/19	Mathlib/Tactic/Linter/TextBased.lean,scripts/lint-style.lean	2	19	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	joneugster assignee:joneugster	130-51168 4 months ago	130-51171 4 months ago	43-17409 43 days
23349	BGuillemet author:BGuillemet	feat: add LocallyLipschitzOn.lipschitzOnWith_of_isCompact and two small lemmas about Lipschitz functions	Main feat (in Mathlib/Topology/EMetricSpace/Basic.lean): if a function `f` from an extended pseudometric space to a pseudometric space is locally Lipschitz on a compact subset `s`, then `f` is Lipschitz on `s`. The theorem is true only when the codomain of `f` is a pseudometric space, so it needs imports from Mathlib/Topology/MetricSpace. Other small feat (in Mathlib/Analysis/Calculus/ContDiff/RCLike.lean): a function that is continuously differentiable on an open subset is locally Lipschitz on this subset. --- - [ ] depends on: #22890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-topology merge-conflict	59/4	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	PatrickMassot assignee:PatrickMassot	129-32898 4 months ago	129-32900 4 months ago	35-30364 35 days
23767	grunweg author:grunweg	refactor: make library notes a definition	Make library notes a definition of `Unit` type, whose doc-string is the note's content. As a consequence, - doc-gen will display all library notes without any custom logic, - library notes are shown upon hover (via the use of the doc-string), - go do definition for library notes is easy Automate this using a macro, which also enforces that all library notes are inside the Mathlib.LibraryNote namespace. Temporarily, we use the `library_note2` name; if/when the batteries version is changed, we can reclaim the original name. This PR does not address how to refer to library notes nicely (in a way that is shown in the documentation, checked for typos, with sufficient imports ensured etc.). That is left to a future PR. This is proposal 2a from this [zulip discussion]([#mathlib4 > library notes @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/library.20notes/near/510614740)) ------------ Open questions/TODOs: - should this go in batteries instead? can the old definition just be overwritten? - otherwise, what's the best place for the `LibraryNote` definition? A single file just for this feels overkill; I put it in Mathlib.Tactic.Basic for now. I could use Mathlib.Init, of course (but that might be excessive) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta merge-conflict	48/48	Archive/Imo/Imo2019Q2.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Scalar.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Note.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Logic/Basic.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/NormNum/Basic.lean,Mathlib/Tactic/Simps/Basic.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Continuous.lean	26	9	['adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	127-45993 4 months ago	127-45995 4 months ago	51-69759 51 days
21182	joneugster author:joneugster	fix(Util/CountHeartbeats): move elaboration in #count_heartbeats inside a namespace	Currently the `#count_heartbeat` linter reported the heartbeats until it concluded `error: [declaration] has already been declared` instead of re-elaborating the declaration. --- [Zulip report](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/count_heartbeats.20for.20all.20declarations.20in.20a.20file.3F/near/496303652) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	72/5	Mathlib/Util/CountHeartbeats.lean,MathlibTest/CountHeartbeats.lean	2	17	['adomani', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib-bors']	adomani assignee:adomani	122-61646 4 months ago	122-61647 4 months ago	64-19141 64 days
25340	dupuisf author:dupuisf	chore(Analysis/Convex): move files pertaining to convex/concave functions to their own folder	This PR creates a new folder under `Analysis/Convex` called `Analysis/Convex/Function`, which includes files that are mostly or entirely about convex/concave functions (as opposed to convex sets). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry merge-conflict	4264/4155	Mathlib.lean,Mathlib/Analysis/Convex/Continuous.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convex/Extrema.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Function/Basic.lean,Mathlib/Analysis/Convex/Function/Continuous.lean,Mathlib/Analysis/Convex/Function/Deriv.lean,Mathlib/Analysis/Convex/Function/Extrema.lean,Mathlib/Analysis/Convex/Function/Integral.lean,Mathlib/Analysis/Convex/Function/Jensen.lean,Mathlib/Analysis/Convex/Function/Mul.lean,Mathlib/Analysis/Convex/Function/Piecewise.lean,Mathlib/Analysis/Convex/Function/Quasiconvex.lean,Mathlib/Analysis/Convex/Function/Slope.lean,Mathlib/Analysis/Convex/Function/Strong.lean,Mathlib/Analysis/Convex/Integral.lean,Mathlib/Analysis/Convex/Jensen.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/Piecewise.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Convex/SpecificFunctions/Basic.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/Convex/Strong.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Log/NegMulLog.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/MeasureTheory/Measure/Decomposition/IntegralRNDeriv.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean	34	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	118-55725 3 months ago	118-55727 3 months ago	6-40169 6 days
18441	ADedecker author:ADedecker	refactor(AdicTopology): use new API for algebraic filter bases, and factor some code	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	847/159	Mathlib.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/AdicTopology.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	3	['ADedecker', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	106-47466 3 months ago	106-47468 3 months ago	0-679 11 minutes
18439	ADedecker author:ADedecker	refactor: use new algebraic filter bases API in `FiniteAdeleRing`	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	699/21	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	106-47464 3 months ago	106-47466 3 months ago	0-619 10 minutes
18438	ADedecker author:ADedecker	refactor: adapt `KrullTopology` to the new algebraic filter bases API	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	771/168	Mathlib.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	5	['ADedecker', 'AntoineChambert-Loir', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	106-47463 3 months ago	106-47464 3 months ago	0-638 10 minutes
13964	pechersky author:pechersky	feat(Data/DigitExpansion): begin defining variant of reals without rationals	Based on a de Bruijn 1976 paper. This file is just the basic definition of a digit expansion. Will be followed up with further constructions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	518/0	Mathlib.lean,Mathlib/Data/DigitExpansion/Defs.lean,docs/references.bib	3	11	['eric-wieser', 'github-actions', 'kim-em', 'pechersky']	dupuisf assignee:dupuisf	103-29754 3 months ago	341-55970 11 months ago	129-57991 129 days
16074	Rida-Hamadani author:Rida-Hamadani	feat: combinatorial maps and planar graphs	We define combinatorial maps, then we define planar graph using combinatorial maps. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict	243/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Planar.lean,Mathlib/Data/CombinatorialMap.lean	3	28	['Parcly-Taxel', 'Rida-Hamadani', 'github-actions', 'lambda-fairy', 'leanprover-community-bot-assistant']	kmill assignee:kmill	90-81729 2 months ago	90-81730 2 months ago	72-51453 72 days
19796	peakpoint author:peakpoint	feat: L'Hopital's rule from within a convex set	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict	190/19	Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Convex/Topology.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Order/Interval/Set/Basic.lean	5	15	['RemyDegenne', 'github-actions', 'leanprover-community-bot-assistant', 'peakpoint', 'sgouezel']	sgouezel assignee:sgouezel	90-81602 2 months ago	90-81602 2 months ago	80-57750 80 days
24350	erdOne author:erdOne	feat(FieldTheory): fg extension over perfect field is separably generated	Co-authored-by: Christian Merten --- - [x] depends on: #24344 - [x] depends on: #24346 - [x] depends on: #24347 - [x] depends on: #24348 - [x] depends on: #24349 - [x] depends on: #25062 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	466/0	Mathlib.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/FieldTheory/SeparableClosure.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/RingTheory/AlgebraicIndependent/Basic.lean,Mathlib/RingTheory/AlgebraicIndependent/TranscendenceBasis.lean	6	30	['alreadydone', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	90-80824 2 months ago	90-80825 2 months ago	21-66961 21 days
24823	eric-wieser author:eric-wieser	refactor: add `hom` lemmas for the `MonoidalCategory` structure on `ModuleCat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	148/164	Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Generator.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/Rep.lean	11	21	['101damnations', 'YaelDillies', 'eric-wieser', 'github-actions', 'joelriou', 'kbuzzard', 'leanprover-community-bot-assistant']	101damnations assignee:101damnations	90-80814 2 months ago	90-80814 2 months ago	43-42841 43 days
25071	erdOne author:erdOne	feat(EllipticCurve): basic API for singular cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict	320/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	3	35	['Multramate', 'acmepjz', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant']	nobody	90-80568 2 months ago	90-80569 2 months ago	45-4961 45 days
25283	Brian-Nugent author:Brian-Nugent	feat: regular local rings	Adds regular local rings and proves they are integral domains. --- - [ ] depends on: #25280 - [ ] depends on: #25282 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict label:t-algebra$	871/0	.vscode/settings.json,Mathlib.lean,Mathlib/RingTheory/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRingDimension.lean,Mathlib/RingTheory/RegularLocalRing.lean	5	6	['Brian-Nugent', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'yuanyi-350']	nobody	90-80561 2 months ago	90-80561 2 months ago	11-84822 11 days
25573	JovanGerb author:JovanGerb	feat: define `∃ x > y, ...` notation to mean `∃ x, y < x ∧ ...`	This PR changes the elaboration of the binders `∃ x > y,` and `∀ x > y,` to use `<` instead of `>`, because we want to avoid working with `>` as much as possible (and similarly for `≥` vs `≤` ). The advantage is that we don't need to worry about rewriting with lemmas like `gt_iff_lt`. The disadvantage is that people might find this confusing. [#mathlib4 > naming convention for ≤ and < @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/naming.20convention.20for.20.E2.89.A4.20and.20.3C/near/522910464) The main changes are in `Mathlib.Init`, `Mathlib.Util.Delaborators` and `MathlibTest.delaborators`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	59/52	Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/BoxIntegral/Integrability.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Liouville.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Dynamics/Ergodic/Conservative.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Init.lean,Mathlib/MeasureTheory/Covering/LiminfLimsup.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Egorov.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Integral/DivergenceTheorem.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/NumberTheory/LSeries/SumCoeff.lean,Mathlib/Order/Filter/AtTopBot/Finite.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/Topology/CWComplex/Classical/Finite.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/EMetricSpace/Paracompact.lean,Mathlib/Topology/LocallyFinite.lean,Mathlib/Topology/MetricSpace/Ultra/Basic.lean,Mathlib/Util/Delaborators.lean,MathlibTest/delaborators.lean	32	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	90-80549 2 months ago	90-80550 2 months ago	26-17604 26 days
25988	Multramate author:Multramate	refactor(AlgebraicGeometry/EllipticCurve/*): replace Fin 3 with products	This PR continues the work from #24593. Original PR: https://github.com/leanprover-community/mathlib4/pull/24593	t-algebraic-geometry merge-conflict	1000/1022	Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean	6	3	['Multramate', 'github-actions', 'leanprover-community-bot-assistant']	nobody	90-80256 2 months ago	90-80256 2 months ago	18-21880 18 days
26011	linesthatinterlace author:linesthatinterlace	feat: add elementary lifts for `OneHom`, `MulHom`, `MonoidHom` and `RingHom`.	This PR continues the work from #25264. Original PR: https://github.com/leanprover-community/mathlib4/pull/25264	migrated-from-branch t-algebra merge-conflict label:t-algebra$	414/10	Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Ring/Hom/Basic.lean,Mathlib/Algebra/Ring/Hom/Defs.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	90-80252 2 months ago	90-80253 2 months ago	17-68825 17 days
26012	linesthatinterlace author:linesthatinterlace	feat: Low-level derivatives of lifts on `OneHom`, `MulHom` and `MonoidHom`	This PR continues the work from #25290. Original PR: https://github.com/leanprover-community/mathlib4/pull/25290	migrated-from-branch t-algebra merge-conflict label:t-algebra$	785/34	Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Ring/Hom/Basic.lean,Mathlib/Algebra/Ring/Hom/Defs.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	90-80251 2 months ago	90-80252 2 months ago	17-68773 17 days
7596	alreadydone author:alreadydone	feat: covering maps from properly discontinuous actions and discrete subgroups	--- - [x] depends on: #23236 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-topology merge-conflict	350/21	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Pointwise.lean,Mathlib/Topology/Covering/AddCircle.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Galois.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Instances/AddCircle/Defs.lean	9	18	['ADedecker', 'alreadydone', 'digama0', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	90-32432 2 months ago	90-32433 2 months ago	73-67280 73 days
24405	mcdoll author:mcdoll	refactor(Topology/Algebra/Module/WeakDual): Clean up	- Move `Dual` and `dualPairing` lower in the import-hierachy - deduplicate `dualPairing` - Make `WeakDual` and `WeakSpace` reducible --- New version of #11500 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology merge-conflict	146/162	Mathlib.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Analysis/VonNeumannAlgebra/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/Topology/Algebra/Module/Dual.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,docs/overview.yaml,docs/undergrad.yaml	14	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	89-45685 2 months ago	89-45686 2 months ago	69-52361 69 days
26067	mapehe author:mapehe	feat(Topology/StoneCech): exists_continuous_surjection_from_StoneCech_to_dense_range	This lemma formalises the following version of the maximality property of the Stone–Čech compactification: If `f : α → β` is a continuous map from a topological space `α` to a Hausdorff space `β` with dense range, then there exists a continuous surjection from `StoneCech α` to `β` extending `f`. In particular, `StoneCech α` is the “largest” compact Hausdorff space into which `α` densely embeds, in the sense that any other such space is a continuous image of it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	18/0	Mathlib/Topology/StoneCech.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	87-61634 2 months ago	87-61634 2 months ago	20-8582 20 days
24103	plp127 author:plp127	feat(Topology/UniformSpace/OfCompactT2): generalize theorem	Generalize `uniformSpaceOfCompactT2` to `uniformSpaceOfCompactR1`. --- - [ ] depends on: #24098 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	48/24	Mathlib/Topology/Separation/Regular.lean,Mathlib/Topology/UniformSpace/OfCompactT2.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	86-37409 2 months ago	86-37410 2 months ago	76-65641 76 days
24096	plp127 author:plp127	feat(Topology): Completely Regular Space iff Uniformizable	Proves that `CompletelyRegularSpace`s are uniformizable and that `UniformSpace`s are completely regular. --- - [x] depends on: #24179 - [x] depends on: #24173 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	339/1	Mathlib.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/Uniformizable.lean	5	10	['alreadydone', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'plp127']	nobody	84-34936 2 months ago	84-80353 2 months ago	2-8297 2 days
26608	vihdzp author:vihdzp	feat(SetTheory/Cardinal/Aleph): `o.card ≤ ℵ_ o` and variants	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	24/0	Mathlib/SetTheory/Cardinal/Aleph.lean	1	3	['github-actions', 'kckennylau', 'leanprover-community-bot-assistant']	nobody	70-24909 2 months ago	70-24910 2 months ago	23-63406 23 days
20719	gio256 author:gio256	feat(AlgebraicTopology): delaborators for truncated simplicial notations	We add delaborators for the following notations, introduced in #20688: - `⦋m⦌ₙ`, which denotes the `m`-dimensional simplex in the `n`-truncated simplex category. - `X _⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated simplicial object `X`. - `X ^⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated cosimplicial object `X`. If `pp.proofs` is set to `true`, we also pretty-print the proof `p : m ≤ n` for all three notations as `⦋m, p⦌ₙ`, `X _⦋m, p⦌ₙ`, and `X ^⦋m, p⦌ₙ`, respectively. Credit to @kmill for one piece of code and much metaprogramming inspiration. --- - [x] depends on: #20688 - [x] depends on: #23018 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology infinity-cosmos t-meta merge-conflict	525/33	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SimplexCategory.lean,Mathlib/Util/Superscript.lean,MathlibTest/SimplexCategory.lean,MathlibTest/SimplicialObject.lean,MathlibTest/superscript.lean,scripts/noshake.json	11	23	['eric-wieser', 'gio256', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	eric-wieser assignee:eric-wieser	64-52511 2 months ago	64-52511 2 months ago	88-84229 88 days
25238	Hagb author:Hagb	feat(Tactic/ComputeDegree): add support for scalar multiplication with different types	It would be able to deal with `a • (X : R[X])` where `a : S` is in a different type `S` with `[SMulZeroClass S R]`. --- - [x] depends on: #25237 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta merge-conflict	17/5	Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	60-58896 1 month ago	60-58896 1 month ago	38-26044 38 days
11632	mattrobball author:mattrobball	chore(Group/RingTheory.Congruence): make `Quotient`'s reducible	These are essentially wrappers and should not expose any data when made reducible. Their use in constructing typeclass instances makes reducible transparency desirable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory merge-conflict	16/35	Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/RingTheory/Congruence/Basic.lean	2	14	['eric-wieser', 'fpvandoorn', 'github-actions', 'grunweg', 'kmill', 'leanprover-bot', 'mattrobball']	nobody	60-58843 1 month ago	60-58843 1 month ago	2-10495 2 days
9820	jjaassoonn author:jjaassoonn	feat(RingTheory/GradedAlgebra/HomogeneousIdeal): generalize to homogeneous submodule	The definitions, constructions and theorems in `HomogeneousIdeal.lean` are generalized to a homogeneous submodules. So say $R$ is a ring and $M \cong \bigoplus_{i} M_i$ is an $R$-module. Then a homogeneous $R$-submodule of $M$ is an $R$-submodule $N$ such that for all $i$ and $n \in N$, $n_i \in N$. Note that this notion doesn't actually require $R$ to be graded and $M$ is a graded module. But for more interesting lemmas, we do need that $M$ is graded $R$-module. We bake the fact $R$ is graded into the definition of homogeneous submodule, otherwise, `CompleteLattice HomogeneousSubmodule` cannot find the order of synthesis (the proof depends on that $R$ is graded) All definitions/constructions/theorems have a copy for ideals as well, this is to make sure dot notation still works. The motivation of this generalization is graded quotient module --- - [ ] depends on:#18728 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	516/185	Mathlib/Algebra/Module/GradedModule.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,scripts/nolints_prime_decls.txt	7	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	59-60818 1 month ago	59-60818 1 month ago	172-57747 172 days
9339	FMLJohn author:FMLJohn	feat (RingTheory/GradedAlgebra/HomogeneousIdeal): given a finitely generated homogeneous ideal of a graded semiring, construct a finite spanning set for the ideal which only contains homogeneous elements	--- - [ ] depends on: #8187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	402/4	Mathlib.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Module/GradeZeroModule.lean,Mathlib/RingTheory/Finiteness.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousIdeal.lean,Mathlib/RingTheory/GradedAlgebra/Noetherian.lean	8	11	['FMLJohn', 'github-actions', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	59-60811 1 month ago	59-60811 1 month ago	0-0 0 seconds
26200	adomani author:adomani	fix: add label when landrun fails	Adds the `permission-denied` label on PRs that get blocked by landrun. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict	68/8	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	59-9849 1 month ago	59-9849 1 month ago	46-52210 46 days
27378	peakpoint author:peakpoint	refactor(Geometry/Euclidean/Projection): redefine projection and reflection for affine subspaces	This PR continues the work from #25578. Original PR: https://github.com/leanprover-community/mathlib4/pull/25578	new-contributor t-euclidean-geometry merge-conflict	316/317	Mathlib/Analysis/Normed/Affine/ContinuousAffineMap.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Geometry/Euclidean/Circumcenter.lean,Mathlib/Geometry/Euclidean/Projection.lean	4	7	['github-actions', 'jsm28', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'peakpoint']	nobody	56-35059 1 month ago	56-35060 1 month ago	15-31164 15 days
27451	kckennylau author:kckennylau	feat(RingTheory/Valuation): define ball, closed ball, and sphere	From the 2025 Local Class Field Theory Workshop. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	27/0	Mathlib/RingTheory/Valuation/Basic.lean	1	13	['JovanGerb', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky', 'wwylele']	nobody	53-42352 1 month ago	53-42353 1 month ago	17-52359 17 days
27987	kckennylau author:kckennylau	feat(RingTheory/Valuation): define ball, closed ball, and sphere	--- The pullback PR of #26827 and #27451. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import merge-conflict	73/0	Mathlib/RingTheory/Valuation/Basic.lean	1	4	['JovanGerb', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	53-41981 1 month ago	53-41982 1 month ago	6-6455 6 days
25978	Bergschaf author:Bergschaf	feat(Order/Sublocale): Open Sublocales	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25089	t-order merge-conflict	377/8	Mathlib.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/Nucleus.lean,Mathlib/Order/Sublocale.lean,Mathlib/Order/Synonym.lean,docs/references.bib	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	52-73543 1 month ago	52-73544 1 month ago	0-1908 31 minutes
27003	eric-wieser author:eric-wieser	chore: use `Simp.ResultQ` more often	Also uses `~q` in place of manual `isDefEq` matching. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	18/22	Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/NormNum/Result.lean,Mathlib/Tactic/ReduceModChar.lean	3	7	['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	JovanGerb assignee:JovanGerb	51-56605 1 month ago	51-56606 1 month ago	32-70098 32 days
25483	VTrelat author:VTrelat	chore(Data/Set/Prod, SetTheory/ZFC/Basic): add theorem prod_subset_of_prod and extend ZFC model	Required by @eric-wieser in #24281 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict	103/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean	2	10	['Ruben-VandeVelde', 'VTrelat', 'github-actions', 'leanprover-community-bot-assistant']	nobody	51-46248 1 month ago	90-80555 2 months ago	29-56208 29 days
25401	digama0 author:digama0	feat(Util): SuppressSorry option	See also leanprover/lean4#8611 and [#lean4 > Silent sorry @ 💬](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Silent.20sorry/near/503537964). This is a stop-gap solution while leanprover/lean4#8611 is underway, but it works about as well as any other built in option. Hooking declaration elaborators turns out to be a very powerful technique. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	342/0	Mathlib.lean,Mathlib/Util/CommandElabHook.lean,Mathlib/Util/SuppressSorry.lean,MathlibTest/suppressSorry.lean	4	15	['digama0', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	51-11401 1 month ago	51-11401 1 month ago	71-28549 71 days
27953	CoolRmal author:CoolRmal	feat(ProbabilityTheory): Conditional Jensen's Inequality	This PR adds conditional Jensen's inequality. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict	526/14	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Separation.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondJensen.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean	5	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	50-20644 1 month ago	50-20645 1 month ago	8-36460 8 days
19097	Vierkantor author:Vierkantor	chore(Algebra.Polynomial): split `Polynomial/Basic.lean` into smaller files	This PR splits `Mathlib.Algebra.Polynomial.Basic` into the following files: * `Polynomial/Defs.lean`: definition and ring structure on `R[X]` * `Polynomial/Module.lean`: module structure on `R[X]` * `Polynomial/Monomial.lean`: merged definition of `monomial`, `X`, `C` into the existing file (this is probably the file you want to import from now on) * `Polynomial/EraseUpdate.lean`: definition of `erase` and `update` * `Polynomial/Sum.lean`: definition of `sum` Initially I added the monomial results to a new file, but ended up merging it with `Monomial.lean` since the two of them merge cleanly. --- - [x] depends on: #28030 (going to resurrect this PR on top of that one later) - [x] depends on: #19095 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	3109/2500	Mathlib.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/MonoidAlgebra/Lift.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/MonoidAlgebra/Module.lean,Mathlib/Algebra/MonoidAlgebra/Opposite.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Cardinal.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Defs.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/TrailingDegree.lean,Mathlib/Algebra/Polynomial/EraseUpdate.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/Eval/Degree.lean,Mathlib/Algebra/Polynomial/Module.lean,Mathlib/Algebra/Polynomial/Monomial.lean,Mathlib/Algebra/Polynomial/Sum.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Ext.lean,Mathlib/Data/Finsupp/Fintype.lean,Mathlib/Data/Finsupp/Indicator.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Finsupp/Pointwise.lean,Mathlib/Data/Finsupp/SMulWithZero.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/List/ToFinsupp.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Eigs.lean,Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/Polynomial/Opposites.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/Tactic/ExtractGoal.lean,MathlibTest/Polynomial.lean,MathlibTest/instance_diamonds.lean,scripts/noshake.json	40	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	45-54402 1 month ago	51-47187 1 month ago	0-0 0 seconds
28622	alreadydone author:alreadydone	chore(Mathlib): replace `=>` by `↦`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	51792/51792	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Hom/Rat.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Rat.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Spectrum/Pi.lean,Mathlib/Algebra/Algebra/Spectrum/Quasispectrum.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Centralizer.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/Algebra/Subalgebra/IsSimpleOrder.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Matrix.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Subalgebra/Prod.lean,Mathlib/Algebra/Algebra/Subalgebra/Unitization.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/AlgebraicCard.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Finsupp/Fin.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/Finset/Sigma.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/Limits.lean,Mathlib/Algebra/Category/AlgCat/Monoidal.lean,Mathlib/Algebra/Category/BialgCat/Basic.lean,Mathlib/Algebra/Category/BoolRing.lean,Mathlib/Algebra/Category/CoalgCat/Basic.lean,Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/Algebra/Category/FGModuleCat/Limits.lean,Mathlib/Algebra/Category/Grp/AB.lean,Mathlib/Algebra/Category/Grp/Adjunctions.lean,Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/Grp/Biproducts.lean,Mathlib/Algebra/Category/Grp/CartesianMonoidal.lean,Mathlib/Algebra/Category/Grp/Colimits.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/Grp/FilteredColimits.lean,Mathlib/Algebra/Category/Grp/Images.lean,Mathlib/Algebra/Category/Grp/Kernels.lean,Mathlib/Algebra/Category/Grp/LargeColimits.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/Grp/Limits.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Category/Grp/ZModuleEquivalence.lean,Mathlib/Algebra/Category/Grp/Zero.lean,Mathlib/Algebra/Category/GrpWithZero.lean,Mathlib/Algebra/Category/HopfAlgCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Biproducts.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/Images.lean,Mathlib/Algebra/Category/ModuleCat/Injective.lean,Mathlib/Algebra/Category/ModuleCat/Kernels.lean,Mathlib/Algebra/Category/ModuleCat/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Abelian.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafify.lean,Mathlib/Algebra/Category/ModuleCat/Products.lean	3838	4	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	45-14881 1 month ago	45-14882 1 month ago	0-83357 23 hours
28532	alreadydone author:alreadydone	chore(Algebra/Ring/Defs): add two classes and extend more	Add the missing `NonAssocComm(Semi)ring` and modify existing classes to `extends` more to remove some manual instances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	89/70	Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/NumberTheory/SelbergSieve.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/PowerSeries/GaussNorm.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/Tactic/Ring/Basic.lean,MathlibTest/TCSynth.lean	10	17	['alreadydone', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	44-34744 1 month ago	44-34745 1 month ago	2-77063 2 days
28626	alreadydone author:alreadydone	chore(Archive, Counterexamples): replace => by ↦	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	288/288	Archive/Arithcc.lean,Archive/Examples/IfNormalization/Result.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Archive/Examples/PropEncodable.lean,Archive/Imo/Imo1959Q1.lean,Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q4.lean,Archive/Imo/Imo1972Q5.lean,Archive/Imo/Imo1977Q6.lean,Archive/Imo/Imo1981Q3.lean,Archive/Imo/Imo1987Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo1998Q2.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2006Q5.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q3.lean,Archive/Imo/Imo2013Q1.lean,Archive/Imo/Imo2019Q1.lean,Archive/Imo/Imo2024Q5.lean,Archive/MiuLanguage/Basic.lean,Archive/MiuLanguage/DecisionSuf.lean,Archive/OxfordInvariants/Summer2021/Week3P1.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/AscendingDescendingSequences.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BirthdayProblem.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/Konigsberg.lean,Archive/Wiedijk100Theorems/Partition.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Archive/ZagierTwoSquares.lean,Counterexamples/AharoniKorman.lean,Counterexamples/CanonicallyOrderedCommSemiringTwoMul.lean,Counterexamples/CharPZeroNeCharZero.lean,Counterexamples/CliffordAlgebraNotInjective.lean,Counterexamples/DirectSumIsInternal.lean,Counterexamples/GameMultiplication.lean,Counterexamples/Girard.lean,Counterexamples/HomogeneousPrimeNotPrime.lean,Counterexamples/MapFloor.lean,Counterexamples/MonicNonRegular.lean,Counterexamples/Phillips.lean,Counterexamples/Pseudoelement.lean,Counterexamples/QuadraticForm.lean,Counterexamples/SorgenfreyLine.lean,Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean	54	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	43-44007 1 month ago	43-44008 1 month ago	2-48353 2 days
13795	astrainfinita author:astrainfinita	perf(Algebra/{Group, GroupWithZero, Ring}/InjSurj): reduce everything	--- - [ ] depends on: #15192 - [ ] depends on: #15476 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	340/194	Mathlib/Algebra/Equiv/TransferInstance.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Ring/InjSurj.lean,scripts/noshake.json	9	37	['MichaelStollBayreuth', 'astrainfinita', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mattrobball']	nobody	42-50078 1 month ago	171-65083 5 months ago	52-31623 52 days
24095	lecopivo author:lecopivo	feat: `fun_prop` for Is(Bounded)LinearMap + notation `fun x ↦L[R] f x`	Sets up `fun_prop` for `IsLinearMap` and `IsBoundedLinearMap` also adds notation `fun x ↦ₗ[R] f x` and `fun x ↦L[R] f x` to write bundled versions like lambda function instead of the currently used pointfree notation.	large-import t-algebra merge-conflict label:t-algebra$	352/22	Mathlib.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LinearMap/Pi.lean,Mathlib/Algebra/Module/LinearMap/Prod.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,scripts/noshake.json	8	24	['dagurtomas', 'eric-wieser', 'github-actions', 'lecopivo', 'mathlib4-merge-conflict-bot']	dagurtomas assignee:dagurtomas	42-29079 1 month ago	42-29080 1 month ago	85-19916 85 days
28150	Equilibris author:Equilibris	chore: clean up proofs typevec proofs	While adding variable universe corecs I found a lot of theorems in typevec that could do with a bit of a clean-up --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict	24/26	Mathlib/Data/TypeVec.lean	1	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	42-11323 1 month ago	42-11324 1 month ago	13-49738 13 days
26478	JovanGerb author:JovanGerb	chore(LibraryRewrite): replace `rw??` with `rw?`	As suggested by @YaelDillies, now `rw?` overwrites Lean core's implementation of `rw?`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	56/49	Mathlib/Tactic/Widget/LibraryRewrite.lean,MathlibTest/LibraryRewrite.lean,MathlibTest/rewrites.lean	3	6	['YaelDillies', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	41-81478 1 month ago	41-81478 1 month ago	41-80687 41 days
27403	MoritzBeroRoos author:MoritzBeroRoos	fix: replace probably erroneous usage of ⬝ (with old \cdot) by · (with \centerdot)	Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations \cdot and \centerdot resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for center..). This pr replaces instances of ⬝ where · was probably meant. All of the replacement is in comments, except for the file bench_summary.lean which is used for priting the github benchmark results. Since this file is about scientific notation of numbers, sure · was meant to be used, not a rectangle. [Related](https://github.com/leanprover-community/mathlib4/pull/27399) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict	195/195	Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/DirectSum/Idempotents.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/Normed/Unbundled/InvariantExtension.lean,Mathlib/Analysis/SpecialFunctions/Complex/CircleAddChar.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/FieldTheory/PurelyInseparable/PerfectClosure.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/NumberTheory/SiegelsLemma.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Instances/Matrix.lean,scripts/bench_summary.lean	49	5	['eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	41-77043 1 month ago	64-52965 2 months ago	7-54661 7 days
28042	kckennylau author:kckennylau	feat(Topology/ValuativeRel): a topological basis indexed by pairs of elements	--- The pullback PR of #27314 and #27163. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	140/23	Mathlib/RingTheory/Valuation/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	2	3	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	41-76997 1 month ago	41-76997 1 month ago	7-4998 7 days
27399	MoritzBeroRoos author:MoritzBeroRoos	chore: replace every usage of ⬝ᵥ (with old \cdot) by ·ᵥ (with \centerdot)	Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations `\cdot` and `\centerdot` resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for `center`..): - `\cdot` gives ⬝ [U+2B1D](https://www.compart.com/en/unicode/U+2B1D) "Black Very Small Square" - `\centerdot` gives · [U+00B7](https://www.compart.com/en/unicode/U+00B7) "Middle Dot" Mathlib mostly uses the `\centerdot` variant, except for the dotProduct notation and some probably unsuspecting people wanting \centerdot but getting \cdot in their comments and 6 uses of a notation using the raw `\cdot` without any subscript at `Mathlib\Topology\Homotopy\Product.lean`. This PR replaces the dot product `⬝ᵥ` with its `\centerdot` counterpart `·ᵥ`. The related PR [here](https://github.com/leanprover/vscode-lean4/pull/639) can then overwrite the `\cdot` abbreviation, to produce the same symbol as the `centerdot` abbreviation does. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict	133/133	Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/Topology/Instances/Matrix.lean	25	6	['MoritzBeroRoos', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	41-38875 1 month ago	64-52966 2 months ago	7-62439 7 days
25889	plp127 author:plp127	fix(Tactic/Widget/Conv): fix various issues	Fixes various issues with the `conv?` widget. Closes #25162. ([Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/bug.20in.20.60conv.3F.60)) Specifically, fixes issues with `conv?` where - when converting a `SubExpr.Pos` to conv directions, it always uses the goal expression as reference, even when working on a hypothesis, this often leads to bad results and makes it unusable on hypotheses - it refuses to go all the way in to a function (for example in `Nat.succ 0`, you can't access `Nat.succ`) - it refuses to enter binders where the name of the bound variable contains the character `0` (try it on `∀ (x0 : Nat), x0 = x0`) - it panics if it can't find a binder name instead of just coming up with one itself, this also means usually you can't enter either side of a non-dependent arrow since those usually don't have binder names (try it on `False → False`) - you can't enter the type of a binder, you end up going into the body instead (try it on `fun (x : False) => (x.elim : False → Nat) x.elim`) - you can't partially enter a function, you end up going to the top argument after instead (for example, in the expression `id (id id) 0`, when you click on `id (id id)`, you end up going to `id id`) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	419/84	Mathlib/Tactic/Widget/Conv.lean,MathlibTest/conv?.lean	2	5	['bryangingechen', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	bryangingechen and kmill assignee:kmill assignee:bryangingechen	40-27168 1 month ago	40-27169 1 month ago	70-58775 70 days
23621	astrainfinita author:astrainfinita	chore: deprecate `LinearOrderedComm{Monoid, Group}WithZero`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #20676	t-order t-algebra merge-conflict label:t-algebra$	261/205	Archive/Imo/Imo1998Q2.lean,Counterexamples/LinearOrderWithPosMulPosEqZero.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/NNRat/Lemmas.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Defs.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean,Mathlib/NumberTheory/FunctionField.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/RingTheory/Valuation/Archimedean.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/ExtendToLocalization.lean,Mathlib/RingTheory/Valuation/Integers.lean,Mathlib/RingTheory/Valuation/Integral.lean,Mathlib/RingTheory/Valuation/Minpoly.lean,Mathlib/RingTheory/Valuation/Quotient.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/RingTheory/Valuation/ValExtension.lean,Mathlib/RingTheory/Valuation/ValuationRing.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean,Mathlib/Topology/UnitInterval.lean,MathlibTest/instance_diamonds.lean,scripts/noshake.json	44	n/a	['astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	kbuzzard assignee:kbuzzard	40-22165 1 month ago	unknown	unknown
28708	sjh227 author:sjh227	feat (Data) : edit DoublyStochastic, add Stochastic to matrix	edit DoublyStochastic add Stochastic --- Add the file Stochastic to matrix. Edit DoublyStochastic so that it depends on Stochastic along with a new lemma	t-data new-contributor merge-conflict	249/1	Mathlib.lean,Mathlib/Data/Matrix/DoublyStochastic.lean,Mathlib/Data/Matrix/Stochastic.lean	3	26	['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'sjh227']	nobody	37-29587 1 month ago	37-29587 1 month ago	0-78027 21 hours
27785	staroperator author:staroperator	chore(Algebra/Group/Submonoid): golf `Nat.addSubmonoidClosure_one` using `simp`	This should improve the proof readability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict label:t-algebra$	8/15	Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Order/Star/Basic.lean	3	9	['github-actions', 'joneugster', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'staroperator']	joneugster assignee:joneugster	36-82338 1 month ago	36-82339 1 month ago	26-34065 26 days
28148	kckennylau author:kckennylau	feat(Matrix): Simproc and Rw-proc for Matrix Transpose	Co-authored by Aaron Liu. ```lean example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by rw [transpose_of% 2 3] example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by rw [transpose_of] example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by simp only [matrix_transpose] ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	267/8	Mathlib.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/LinearAlgebra/UnitaryGroup.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/Matrix.lean,MathlibTest/Simproc/Matrix.lean,MathlibTest/matrix.lean,scripts/noshake.json	8	32	['eric-wieser', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'plp127']	eric-wieser assignee:eric-wieser	36-82209 1 month ago	36-82210 1 month ago	16-54453 16 days
26510	alreadydone author:alreadydone	feat(Matroid): exchange lemmas involving closure	--- for #24350 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-combinatorics merge-conflict	37/0	Mathlib/Data/Matroid/Closure.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	kmill assignee:kmill	36-17985 1 month ago	36-17986 1 month ago	60-26324 60 days
26912	pechersky author:pechersky	chore(Algebra/Ring/Subring): simp tag `Subring.smul_def`	s-multiplying by a subtype is easiest to manipulate when both terms are in the ambient type. Many places that had to use the _def lemma for a rewrite, or to include it in a simp set, no longer have to. Ported from #25308 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) I found this being not-simp frustrating when talking about submodules over a valuation subring.	maintainer-merge t-algebra merge-conflict label:t-algebra$	68/67	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Exact.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Ring/Periodic.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/LinearAlgebra/RootSystem/Irreducible.lean,Mathlib/LinearAlgebra/RootSystem/RootPositive.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/RingTheory/Etale/Kaehler.lean,Mathlib/RingTheory/LocalProperties/Projective.lean,Mathlib/RingTheory/Localization/InvSubmonoid.lean,Mathlib/RingTheory/OreLocalization/Basic.lean	25	19	['artie2000', 'eric-wieser', 'github-actions', 'j-loreaux', 'linesthatinterlace', 'mathlib4-merge-conflict-bot', 'pechersky']	joelriou assignee:joelriou	32-47770 1 month ago	32-47771 1 month ago	51-74059 51 days
22782	alreadydone author:alreadydone	feat(Topology): étalé space associated to a predicate on sections	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	886/160	Mathlib.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Geometry/Manifold/Sheaf/Smooth.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Topology/EtaleSpace.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/Sheaves/LocalPredicate.lean,Mathlib/Topology/Sheaves/Sheafify.lean,Mathlib/Topology/Sheaves/Stalks.lean	10	16	['AntoineChambert-Loir', 'alreadydone', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	PatrickMassot assignee:PatrickMassot	32-46139 1 month ago	59-10495 1 month ago	30-3459 30 days
27566	wwylele author:wwylele	feat(Data/Real): Archimedean.embedReal is a ring hom when M is an ordered ring	Also shows that this ends up the same as `LinearOrderedField.inducedOrderRingHom` for fields --- This is a spin-off from #27268 ~~because I got bored~~ . This is not in a high priority as I don't need it for anything yet, but the last lemma shows that `embedReal` is a generalization of `LinearOrderedField.inducedOrderRingHom` (which is only stated for field, and I didn't find when I was making the group embedding). Perhaps we should refactor `Mathlib/Algebra/Order/CompleteField.lean` with the definition here. Indeed, if we replace every `ℝ` with `(R : Type*)[ConditionallyCompleteLinearOrderedField R]` in `Data/Real/Embedding.lean`, the proof still works. What do you think? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data merge-conflict	220/3	Mathlib/Data/Real/Embedding.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	27-75328 27 days ago	27-75329 27 days ago	40-32085 40 days
26908	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): alternative ext principle for unitors	Currently, our infrastructure for left/right unitors for Day convolution of functors `C ⥤ V` do not have satisfactory extensionality principle: the current way to characterize morphisms out of `U ⊛ F` is the default extensionality principle for Day convolution, which characterizes first such functors via functors out of `U ⊠ F`. Left unitors are then obtained using the fact `U ⊠ F` is a left Kan extension of a functor from `PUnit × C` (which is equivalent to `C`) but we did not record on its own this principle. Using the transitivity of left Kan extensions proved in #26899, we directly exhibit `U ⊛ F` as a left Kan extension of `F ⋙ tensorLeft (𝟙_ V)` along `tensorLeft (𝟙_ C)`. The unit of this Kan extension is composed exactly of the morphisms that appear in the [characterization of left unitors](https://leanprover-community.github.io/mathlib4_docs/Mathlib/CategoryTheory/Monoidal/DayConvolution.html#CategoryTheory.MonoidalCategory.DayConvolutionUnit.leftUnitor_hom_unit_app). We also slightly generalize the instances that express that external products with unitors are left Kan extensions, so that they can be used when taking external products with more complicated functors than currently. This is again useful when chaining extensionality lemmas for morphisms out of terms of the form `(F ⊛ U) ⊛ G`. We prove a similar thing for right unitors With this, it should be possible to have a much more satisfactory way of working with Day convolutions: this allows to "elimiinate" units without ending up with terms in an external product. --- - [ ] depends on: #26899 - [ ] depends on: #26906 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	307/18	Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	25-42155 25 days ago	25-42156 25 days ago	0-1812 30 minutes
27150	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): constructors for braided and symmetric structure on day convolutions monoidal categories	Following the pattern in #27119, we give API to construct `BraidedCategory` and `SymmetricCategory` structures on a monoidal category equipped with a `LawfulDayConvolutionMonoidalCategoryStruct`. To achieve this, we introduce an other type class `LawfulDayConvolutionBraidedCategoryStruct` that bundles an associator isomorphism that behaves like the one constructed for functors in #27067. We provide a noncomputable constructor for this typeclass that takes as input fullness of the "realization" functor to a category of functors, and we show that the typeclasses are sufficient to define the desired structures. --- - [x] depends on: #27067 - [x] depends on: #26820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	826/9	Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean	2	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	25-37194 25 days ago	25-37982 25 days ago	0-1002 16 minutes
27119	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): constructors for closed monoidal day convolution monoidal structures	Following the pattern introduced in #26798 and #26820 and using results of #26879, we introduce a typeclass `LawfulDayConvolutionClosedMonoidalCategoryStruct` that encodes the data needed on a `LawfulDayConvolutionMonoidalCategoryStruct` to define well-behaved internal homs. We give a constructor assuming existence of relevant ends, and prove that this data defines a `MonoidalClosed` instance on the monoidal category structures one can deduce from `LawfulDayConvolutionMonoidalCategoryStruct`. --- - [x] depends on: #27079 - [x] depends on: #27091 - [x] depends on: #26879 - [x] depends on: #26820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	900/9	Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Closed.lean	2	6	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	24-51045 24 days ago	25-37979 25 days ago	0-1 1 second
28623	gilesgshaw author:gilesgshaw	feat(Logic/Basic): minor additions and simplification of proofs	Add new theorems and simplify proofs. Specifically, we add the family of related theorems `apply_dite_iff_exists`, `apply_dite_iff_forall`, `apply_ite_iff_and` and `apply_ite_iff_or`. For each other 'family' of theorems in the file that is analogous to the above, we do the following - Simplify proofs where possible, e.g. by appealing to the new theorems - Complete the family, if any of the corresponding four are missing - Rename to ensure consistency with the above pattern ---	new-contributor t-logic merge-conflict	83/55	Archive/Examples/IfNormalization/Result.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Notation/Indicator.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/Logic/Basic.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean,Mathlib/SetTheory/Ordinal/Notation.lean	9	12	['eric-wieser', 'gilesgshaw', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	awainverse assignee:awainverse	24-44906 24 days ago	24-44907 24 days ago	21-3001 21 days
27933	grunweg author:grunweg	chore(OrdNode): format code example in code blocks	Wrap them in code blocks (and unindent them; that indentation is not needed any more). This also avoids warnings from the linter in #27898. ------- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	459/212	Mathlib/Data/Ordmap/Ordnode.lean	1	4	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	20-81939 20 days ago	20-81940 20 days ago	39-69478 39 days
27508	chrisflav author:chrisflav	feat(RingTheory): height under ring homomorphism	We show that if `P` lies over `p`, the height of `P` is bounded by the height of `p` plus the height of the image of `P` in `S ⧸ p S`. In a follow-up PR, we show that equality holds if `S` satisfies going-down as an `R`-algebra. Co-authored by: Sihan Su Co-authored by: Yi Song --- - [x] depends on: #28520 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import merge-conflict	118/1	Mathlib/Data/Set/Finite/Basic.lean,Mathlib/Data/Set/Function.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Basic.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean	7	13	['YaelDillies', 'chrisflav', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	20-24241 20 days ago	37-27162 1 month ago	1-25924 1 day
26154	ADedecker author:ADedecker	refactor: add refactored APIs for algebraic filter bases	This PR continues the work from #18437. Original PR: https://github.com/leanprover-community/mathlib4/pull/18437	t-topology merge-conflict	651/0	Mathlib.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	5	3	['ADedecker', 'github-actions', 'mathlib4-merge-conflict-bot']	PatrickMassot assignee:PatrickMassot	18-57150 18 days ago	18-57151 18 days ago	87-79752 87 days
26890	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution) : more API for `DayFunctor`	We provide some lemmas that helps characterizing the monoidal structure on `DayFunctor`, they are special cases of the lemmas for `LawfulDayConvolutionMonoidalCategoryStruct`. --- - [ ] depends on: #26824 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	1372/19	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean	4	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-20942 16 days ago	unknown	unknown
26983	mans0954 author:mans0954	feat(Order/LatticeElements): distributive, standard and neutral elements of a lattice	Defines distributive, standard and neutral elements of a lattice and gives equivalent conditions. --- - [ ] depends on: #26836 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	287/0	Mathlib.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/LatticeElements.lean,docs/references.bib	4	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	14-24331 14 days ago	14-24332 14 days ago	0-1136 18 minutes
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 merge-conflict	2/3	Mathlib/Data/Fin/Embedding.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	12-49443 12 days ago	12-49444 12 days ago	18-38918 18 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 merge-conflict	61/68	Mathlib/GroupTheory/Perm/Fin.lean	1	10	['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'tb65536']	nobody	9-68747 9 days ago	9-68748 9 days ago	20-39203 20 days
21950	erdOne author:erdOne	feat(NumberTheory/Padics): the completion of `ℚ` at a finite place is `ℚ_[p]`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory merge-conflict	253/1	Mathlib.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroMulInt.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	7	33	['Ruben-VandeVelde', 'erdOne', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky', 'smmercuri', 'xroblot']	nobody	7-43857 7 days ago	88-43794 2 months ago	79-1228 79 days
28001	daefigueroa author:daefigueroa	feat(Dynamics): add results on topologically transitive flows	We define topological transitivity for a flow and show that a factor of a topologically transitive flow is topologically transitive. --- This contribution was created as part of the Utrecht Summerschool "Formalizing Mathematics in Lean" in July 2025. - [ ] depends on: #28000 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-dynamics merge-conflict	68/3	Mathlib.lean,Mathlib/Dynamics/Flow.lean,Mathlib/Dynamics/Transitive.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-17375 5 days ago	5-17376 5 days ago	0-4581 1 hour
27214	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): Categorical pullback squares	In this PR, we give the definition and first basic properties of categorical pullback squares. Using our previous work on `CategoricalPullback`, we define a typeclass `CatPullbackSquare T L R B` that asserts that a given `CatCommSq T L R B` is a "pullback square": this is the data of a chosen adjoint equivalence to the canonical functor from the top left corner of the square to the categorical pulback of its leg. Using this equivalence, be derive a universal property for functors from `X`with values in the top left corner of the square: they are equivalent to `CatCommSqOver R B X`, the category of categorical commutative squares over the cospan `R, B` with top left corner `X`. We prove some coherence result for this equivalence, most notably an isomorphism that, given `S : CatCommSqOver R B X`, bundles the two commutative triangles formed by the induced functor, and the coherence between the squares that these isomorphisms satisfy: this is conveniently bundled in the data of a single isomorphisms of `CatCommSqOver R B X`. Finally, we provide a `Prop`-class `IsCatPullbackSquare` that merely asserts the existence (via `Nonempty`) of the relevant data: we show that it is tautotogically equivalent to the propopsition that the canonical functor to the categorical pullback is an equivalence. --- - [ ] depends on: #26679 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	786/1	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-33939 4 days ago	4-33940 4 days ago	0-5521 1 hour
26466	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/Augmented): the canonical monoid object in the augmented simplex category	Show that in the augmented simplex category, `⦋0⦌` is an internal monoid object. Future work will show that this is in fact the universal monoid object: for any monoidal category `C`, evaluation at `⦋0⦌` induces an equivalence of categories between `Mon_ C` and the category of monoidal functors from `AugmentedSimplexCategory` to `C`. The resulting augmented cosimplicial object one gets from this construction is sometimes called the "monoidal bar construction" attached to a monoid. This PR was split from #25743. --- - [ ] depends on: #25743 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology t-category-theory merge-conflict	571/111	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Mon_.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Monoidal.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean	6	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-53341 3 days ago	3-53343 3 days ago	0-1708 28 minutes
26578	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Pullbacks/Categorical/CatCospanTransform): adjunctions of categorical cospans	We build upon the bicategory-like structure developed in #26447 and #26412 to define the notion of adjunctions of categorical cospans. This is a structure encoding the data of two `CatCospanTransform`s, along with the usual unit and counit morphisms as part of the data, satisfying the usual left and right triangle identities. We provide basic API for these, such as extracting adjunctions between individual components. We also provide a proof that the notion satisfies a "coherence": with our chosen constructor, the forward direction of the structure `CatCommSq` on the left adjoints correspond to the inverse of the square for the right adjoints through `mateEquiv`. These adjunctions will be used as a substrate for defining equivalences of categorical cospans in a future PR: such an equivalence will be a structure extending a `CatCospanAdjunction` with isomorphisms data on the unit and co-unit (we will however provide alternative constructors in sync with the constructor for equivalences of categories). --- - [x] depends on: #26447 - [x] depends on: #26547 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict	205/0	Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean	1	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-56566 2 days ago	2-59538 2 days ago	0-625 10 minutes
27882	euprunin author:euprunin	chore: golf using `grind [Nat.cast_*]`		merge-conflict	6/18	Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/EulerSineProd.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/RingTheory/ZMod/UnitsCyclic.lean	4	12	['github-actions', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	urkud assignee:urkud	1-62590 1 day ago	1-62591 1 day ago	60-4294 60 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 merge-conflict	148/2	Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Maps/Basic.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	ADedecker assignee:ADedecker	1-59010 1 day ago	1-59011 1 day ago	134-68375 134 days
28243	robin-carlier author:robin-carlier	chore(CategoryTheory/Bicategory): move some `eqToHom` lemmas	The file `CategoryTheory/Bicategory/EqToHom.lean` introduced in #28242 is a more suitable hom for the lemmas `CategoryTheory.Bicategory.whiskerLeft_eqToHom` and `CategoryTheory.Bicategory.eqToHom_whiskerRight` than the current `CategoryTheory/Bicategory/Strict.lean`. We move these lemmas to the new file, and make `CategoryTheory/Bicategory/Strict` import these lemmas. --- - [ ] depends on: #28242 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	165/23	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/EqToHom.lean,Mathlib/CategoryTheory/Bicategory/Strict.lean,Mathlib/CategoryTheory/EqToHom.lean,scripts/noshake.json	5	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier']	nobody	1-25079 1 day ago	1-25080 1 day ago	0-9063 2 hours
29136	YaelDillies author:YaelDillies	feat(CategoryTheory/Monoidal): `mapMon` of a lax-braided functor is lax-braided	Also move the `BraidedCategory (Mon_ C)` instance earlier in the file to avoid splitting up the functor material. I think it makes more sense like this (defining `Mon_Class`, then `Mon_`, then `Functor.mapMon`). From Toric --- - [ ] depends on: #30157 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-category-theory merge-conflict	466/404	Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/CategoryTheory/Monoidal/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean	3	12	['YaelDillies', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	TwoFX assignee:TwoFX	0-38979 10 hours ago	0-38980 10 hours ago	29-76830 29 days

Stale new contributor PRs

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
15224	AnthonyBordg author:AnthonyBordg	feat(CategoryTheory/Sites): covering families and their associated Grothendieck topology	Define covering families on a category and their associated Grothendieck topology by using the API for `Coverage`. Give an explicit characterization of the covering sieves of the said topology. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	112/0	Mathlib.lean,Mathlib/CategoryTheory/Sites/CoveringFamilies.lean	2	20	['AnthonyBordg', 'adamtopaz', 'dagurtomas', 'github-actions', 'joelriou']	nobody	424-41295 1 year ago	429-34960 1 year ago	1-48443 1 day
14563	awueth author:awueth	feat: if-then-else of exclusive or statement	--- If `¬(P ∧ Q)` then `ite (P ∨ Q) a 1 = (ite P a 1) * (ite Q a 1)` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	5/0	Mathlib/Algebra/Group/Basic.lean	1	3	['eric-wieser', 'github-actions', 'kim-em']	nobody	414-58671 1 year ago	414-58671 1 year ago	6-38745 6 days
11090	pangelinos author:pangelinos	feat: define spectral spaces and prove that a quasi-compact open of a spectral space is spectral	Define spectral spaces and prove that a quasi-compact open of a spectral space is spectral. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology please-adopt good first issue	69/0	Topology/Spectral/basic.lean	1	15	['YaelDillies', 'adomani', 'j-loreaux', 'jcommelin', 'kim-em', 'pangelinos']	nobody	410-42923 1 year ago	414-55849 1 year ago	16-44803 16 days
15121	Eloitor author:Eloitor	feat: iff theorems for IsSplitEpi and IsSplitMono in opposite category	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	40/0	Mathlib/CategoryTheory/EpiMono.lean	1	3	['github-actions', 'joelriou', 'mattrobball']	nobody	397-18415 1 year ago	428-64074 1 year ago	7-3203 7 days
16773	arulandu author:arulandu	feat(Probability/Distributions): formalize Beta distribution	Formalize Beta distribution, using Gamma distribution as a reference. Added real-valued beta wrapper, in the manner of gamma. Thanks to @EtienneC30 for help with casting real <-> complex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	286/1	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Probability/Distributions/Beta.lean	3	48	['EtienneC30', 'arulandu', 'github-actions', 'vihdzp']	arulandu assignee:arulandu	378-65032 1 year ago	383-61750 1 year ago	1-21124 1 day
14603	awueth author:awueth	feat: degree is invariant under graph isomorphism	--- Mathlib has the definition `SimpleGraph.Iso.mapNeighborSet` which is an equivalence between neighbor sets induced by an isomorphism. Would it be beneficial to add the same equivalence for `neighborFinset`? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics WIP	24/0	Mathlib/Combinatorics/SimpleGraph/Map/Finite.lean	1	11	['awueth', 'github-actions', 'jcommelin', 'kim-em', 'urkud']	nobody	346-37417 11 months ago	346-37417 11 months ago	31-44440 31 days
18461	hannahfechtner author:hannahfechtner	feat: left and right common multiples mixins	add mixins for left and right common multiples. These carry the data of what factors are used to create the common multiples --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	78/0	Mathlib/Algebra/Group/Defs.lean	1	13	['github-actions', 'hannahfechtner', 'jcommelin', 'kbuzzard', 'kim-em', 'trivial1711']	nobody	256-61952 8 months ago	256-61952 8 months ago	69-35596 69 days
20797	vbeffara author:vbeffara	feat(Topology/Covering): CM version of eq_of_comp_eq	Add equivalents of the lemmas `IsCoveringMap.eq_of_comp_eq` and `IsCoveringMap.const_of_comp_CM` for the case of bundled `ContinuousMap` parameters. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology easy awaiting-author	9/1	Mathlib/Topology/Covering.lean	1	4	['github-actions', 'ocfnash', 'vbeffara']	nobody	256-48717 8 months ago	257-49670 8 months ago	2-77310 2 days
13442	dignissimus author:dignissimus	feat: mabel tactic for multiplicative abelian groups	Mabel tactic for multiplicative abelian groups (#10361) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta modifies-tactic-syntax awaiting-author help-wanted	439/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MAbel.lean,MathlibTest/mabel.lean	4	10	['BoltonBailey', 'dignissimus', 'github-actions', 'joneugster', 'kbuzzard']	joneugster assignee:joneugster	226-14480 7 months ago	230-82476 7 months ago	0-16 16 seconds
21501	sksgurdldi author:sksgurdldi	feat(List): add sum_zipWith_eq_finset_sum	### Description: This PR adds the lemma `List.sum_zipWith_eq_finset_sum` to `Mathlib.Algebra.BigOperators.Group.Finset.Basic`. #### Statement: The sum of the `zipWith` operation on two lists equals the sum of applying the operation to corresponding elements of the two lists, indexed over the minimum of their lengths. #### Formal Statement: ```lean lemma sum_zipWith_eq_finset_sum [Inhabited α] [Inhabited β] [AddCommMonoid γ] {op : α → β → γ} (l : List α) (m : List β) : (List.zipWith op l m).sum = ∑ x ∈ (Finset.range (Nat.min l.length m.length)), op (l[x]!) (m[x]!) ``` #### Remarks: - This lemma provides a useful equivalence between `List.zipWith` and summation over a `Finset.range` indexed by `Nat.min l.length m.length`. - It can be helpful in algebraic manipulations involving list-based summations. #### Dependencies: No additional dependencies. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	43/0	Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean	1	1	['github-actions', 'j-loreaux']	nobody	226-13559 7 months ago	226-13559 7 months ago	13-33168 13 days
22302	CharredLee author:CharredLee	feat: add `CategoryTheory.Topos.Power`	This is a continuation of #21281 with the end goal of defining topoi in Mathlib. It introduces the notion of a power object in a category with a subobject classifier, which is a special case of an internal hom. The definition `HasPowerObjects C` contained in this PR is all that remains before `IsTopos C` can be defined. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	312/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Power.lean	2	2	['github-actions', 'joelriou']	b-mehta assignee:b-mehta	220-14755 7 months ago	220-15882 7 months ago	0-1528 25 minutes
22159	shetzl author:shetzl	feat: add definition of pushdown automata	Add the definition of pushdown automata and their two acceptance conditions: acceptance based on empty stack and acceptance based on final state. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	70/0	Mathlib.lean,Mathlib/Computability/PDA.lean	2	34	['YaelDillies', 'github-actions', 'madvorak', 'shetzl']	nobody	200-62302 6 months ago	200-62302 6 months ago	20-81771 20 days
21903	yhtq author:yhtq	feat: add from/toList between `FreeSemigroup` and `List` with relative theorems	Add from/toList between `FreeSemigroup` and `List` with relative theorems, as well as an incidental definition of lexicographic order on `FreeSemigroup`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra awaiting-CI label:t-algebra$	169/0	Mathlib/Algebra/Free.lean	1	11	['YaelDillies', 'github-actions']	nobody	178-77628 5 months ago	178-77628 5 months ago	51-9403 51 days
22657	Xmask19 author:Xmask19	feat: a graph is maximally acyclic iff it is a tree	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	86/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	6	['Rida-Hamadani', 'b-mehta', 'github-actions', 'grunweg']	b-mehta assignee:b-mehta	178-43285 5 months ago	178-43306 5 months ago	200-33970 200 days
22809	b-reinke author:b-reinke	feat: Category algebras and path algebras	This PR defines the category algebra of a linear category and path algebras of quivers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra t-category-theory WIP label:t-algebra$	218/0	Mathlib/Algebra/Ring/Assoc.lean,Mathlib/CategoryTheory/Linear/CategoryAlgebra.lean,Mathlib/Combinatorics/Quiver/PathAlgebra.lean,Mathlib/Data/DFinsupp/BigOperators.lean	4	2	['b-reinke', 'github-actions']	nobody	153-68699 5 months ago	153-68699 5 months ago	0-0 0 seconds
15649	TpmKranz author:TpmKranz	feat(Computability): introduce Generalised NFA as bridge to Regular Expression	Lays the groundwork for a proof of equivalence of NFA and RE, w.r.t. described language. Actual connection to NFA comes later, after the groundwork for the opposite direction has been laid. Second chunk of #12648 --- - [x] depends on: #15647 [Data.FinEnum.Option unchanged since then] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor awaiting-author	298/0	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib	5	6	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'trivial1711']	nobody	151-15018 4 months ago	151-15027 4 months ago	23-54870 23 days
20648	anthonyde author:anthonyde	feat: formalize regular expression -> εNFA	The file `Computability/RegularExpressionsToEpsilonNFA.lean` contains a formal definition of Thompson's method for constructing an `εNFA` from a `RegularExpression` and a proof of its correctness. --- - [x] depends on: #20644 - [x] depends on: #20645 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	5	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'qawbecrdtey']	nobody	151-14329 4 months ago	151-14964 4 months ago	75-77754 75 days
22314	shetzl author:shetzl	feat: add leftmost derivations for context-free grammars	Leftmost derivations are often easier to reason about than arbitrary derivations. This PR adds leftmost variants of Rewrites, Produces and Derives to the existing definition of context-free grammars and proves that a string of terminals can be derived iff it can be leftmost derived. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	383/0	Mathlib.lean,Mathlib/Computability/LeftmostDerivation.lean	2	54	['YaelDillies', 'github-actions', 'madvorak', 'shetzl']	YaelDillies assignee:YaelDillies	147-59693 4 months ago	147-59693 4 months ago	72-3718 72 days
24008	meithecatte author:meithecatte	chore(EpsilonNFA): replace manual lemmas with @[simps]	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	2/24	Mathlib/Computability/EpsilonNFA.lean	1	2	['YaelDillies', 'github-actions', 'urkud']	nobody	145-60557 4 months ago	145-60557 4 months ago	27-52316 27 days
5919	MithicSpirit author:MithicSpirit	feat: implement orthogonality for AffineSubspace	Define `AffineSubspace.orthogonal` and `AffineSubspace.IsOrtho`, as well as develop an API emulating that of `Submodule.orthogonal` and `Submodule.IsOrtho`, respectively. Additionally, provide some relevant lemmas exclusive to affine subspaces, which are mostly to do with the relationship between orthogonality and `AffineSubspace.Parallel`. Closes #5539 --- Still WIP as I need to add more docstrings as well as notations for the new definitions. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis WIP help-wanted	287/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/AffineSubspace.lean	2	6	['MithicSpirit', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	MithicSpirit assignee:MithicSpirit	139-30703 4 months ago	139-30721 4 months ago	0-0 0 seconds
20238	maemre author:maemre	feat(Computability/DFA): Closure of regular languages under some set operations	This shows that regular languages are closed under complement and intersection by constructing DFAs for them. --- Closure under all other operations will be proved when someone adds the proof for DFA<->regular expression equivalence, so they are not part of this PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor awaiting-author	159/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	59	['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'meithecatte', 'urkud']	EtienneC30 assignee:EtienneC30	121-67189 3 months ago	151-14928 4 months ago	48-67492 48 days
24441	MrSumato author:MrSumato	feat(Data/List): add Lyndon-Schutzenberger theorem on list commutativity	Add Lyndon-Schutzenberger theorem on list commutativity. Included definition for List.repeatSelf that returns list repeated n times. --- This is my first mathlib PR, so any comments are highly appreciated. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	129/1	Mathlib.lean,Mathlib/Data/List/Commutativity.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/Lemmas.lean	4	35	['MrSumato', 'github-actions', 'grunweg', 'plp127']	grunweg assignee:grunweg	119-48966 3 months ago	119-48966 3 months ago	29-59355 29 days
23929	meithecatte author:meithecatte	feat(Computability/NFA): improve bound on pumping lemma	--- - [x] depends on: #25321 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor	101/10	Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean	2	41	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'meithecatte']	nobody	118-24580 3 months ago	118-24581 3 months ago	34-10595 34 days
22790	mhk119 author:mhk119	feat: Extend `taylor_mean_remainder_lagrange` to `x < x_0`	The `taylor_mean_remainder_lagrange` theorem has the assumption that $x_0 < x$. In many applications, we need $x < x_0$ and one cannot use the current version to obtain this (see [zulip](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Taylor's.20theorem)). This PR introduces a set of theorems that push negations through Taylor expansions so that one can extend `taylor_mean_remainder_lagrange` to the case when $x < x_0$. These theorems should also be useful elsewhere since they are quite general.	new-contributor t-analysis awaiting-author	111/1	Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/Taylor.lean	3	12	['Paul-Lez', 'github-actions', 'grunweg', 'mhk119']	nobody	115-9085 3 months ago	176-50781 5 months ago	30-77130 30 days
24395	rudynicolop author:rudynicolop	feat(Data/List): list splitting definitions and lemmas	Adds definitions and lemmas for obtaining all prefixes and suffixes of lists. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	143/2	Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/List/TakeDrop.lean	2	4	['BoltonBailey', 'github-actions']	ericrbg assignee:ericrbg	103-16925 3 months ago	103-16925 3 months ago	57-9536 57 days
26376	maddycrim author:maddycrim	Simons2025	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor WIP	29/0	Mathlib/RingTheory/Localization/Pi.lean	1	1	['github-actions']	faenuccio assignee:faenuccio	100-42915 3 months ago	101-21388 3 months ago	0-13 13 seconds
25739	literandltx author:literandltx	feat(NumberTheory/LegendreSymbol): Add sqrt‐of‐residue theorems for p=4k+3 and p=8k+5	Add a new file `QuadraticResidueRoots.lean` under `Mathlib/NumberTheory/LegendreSymbol/` that proves two explicit “square-root of quadratic residue” theorems for primes of the specific form. - `exists_sqrt_of_residue_mod4_eq3` for primes `p = 4k + 3` - `exists_sqrt_of_residue_mod8_eq5`* for primes `p = 8*k + 5` It also introduces the helper lemmas `euler_criterion_traditional` and `legendreSym.at_two_mod8_eq_5`. Import lines in `Mathlib.lean` and `Mathlib/NumberTheory/LegendreSymbol/Basic.lean` have been updated accordingly.	new-contributor t-number-theory awaiting-author	217/0	Mathlib.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticReciprocity.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticResidueRoots.lean	4	2	['github-actions', 'kckennylau']	literandltx assignee:literandltx	95-62442 3 months ago	96-5128 3 months ago	17-63153 17 days
26013	tsuki8 author:tsuki8	feat(Data/Finset/Card,Data/Set/Finite/Basic)	add `card_bijOn` and `finset_subset_preimage_of_finite_image` Add `card_bijOn`: proves that for a bijection between finsets, their cardinalities are equal Add `finset_subset_preimage_of_finite_image`: constructs a finset subset preserving image cardinality Co-authored-by: Junyu Guo --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	15/0	Mathlib/Data/Finset/Card.lean,Mathlib/Data/Set/Finite/Basic.lean	2	5	['Ruben-VandeVelde', 'github-actions']	nobody	94-50817 3 months ago	94-63109 3 months ago	13-85893 13 days
27069	FrankieNC author:FrankieNC	feat(Analysis/MetricSpace/HausdorffDimension): prove dimH of intervals and segments is 1	Add theorems `dimH_Icc01` and `dimH_segment` showing that the Hausdorff dimension of the unit interval [0,1] and of any non-degenerate real segment is 1. The key idea is that the segment is the image of [0,1] under a bi-Lipschitz map. We explicitly construct this map and prove it is both Lipschitz and antilipschitz, allowing us to transfer the dimension result from the unit interval. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology awaiting-author	63/0	Mathlib/Topology/MetricSpace/HausdorffDimension.lean	1	10	['AntoineChambert-Loir', 'FrankieNC', 'github-actions', 'grunweg']	nobody	82-22867 2 months ago	82-35351 2 months ago	0-13398 3 hours
26962	themathqueen author:themathqueen	feat(Data/Nat/Fib/Basic): some API for `Nat.fib`	Added some helpful lemmas for `Nat.fib`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	24/0	Mathlib/Data/Nat/Fib/Basic.lean	1	7	['Ruben-VandeVelde', 'github-actions', 'themathqueen', 'vihdzp']	nobody	77-25409 2 months ago	77-25410 2 months ago	8-31586 8 days
26594	metakunt author:metakunt	feat(Algebra/Polynomial/ZMod): Add Polynomial.equiv_of_nat_of_polynomial_zmod	This adds an explicit bijection between the naturals and $$\mathbb{Z}/n\mathbb{Z}[X]$$ in a canonical way. --- I feel that some API is missing to make the theorem shorter, I have no idea what lemmas to extract though. Also I don't know when to use spaces and when not, so I did it best effort.	new-contributor t-algebra awaiting-author label:t-algebra$	465/0	Mathlib.lean,Mathlib/Algebra/Polynomial/ZMod.lean	2	2	['Ruben-VandeVelde', 'github-actions']	nobody	69-24963 2 months ago	69-24963 2 months ago	25-6199 25 days
27297	hugh-fox author:hugh-fox	feat: add an equality between sums and products of cartesian products	Adds `prod_mul_eq_prod_product` and a version for Finsets `prod_range_mul_eq_prod_product` with to show an equality between `Fin (i * j)` and `Fin a × Fin b`. It is likely `prod_range_mul_eq_prod_product` belongs in a different file, in which case only the first commit should be considered. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	12/0	Mathlib/Algebra/BigOperators/Fin.lean	1	6	['Ruben-VandeVelde', 'github-actions', 'hugh-fox', 'j-loreaux', 'kckennylau']	nobody	65-25487 2 months ago	69-17475 2 months ago	7-6727 7 days
14237	js2357 author:js2357	feat: Define the localization of a fractional ideal at a prime ideal	Define the localization of a fractional ideal at a prime ideal, and prove some basic properties. --- This PR is part 3 out of 4 of a proof of `isDedekindDomain_iff_isDedekindDomainDvr`. Part 4 is available here: #14242 - [x] depends on: #14099 Part 1 - [x] depends on: #14216 Part 2 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	230/0	Mathlib.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean	3	21	['Vierkantor', 'YaelDillies', 'github-actions', 'js2357', 'kbuzzard', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	Vierkantor assignee:Vierkantor	64-35289 2 months ago	64-35321 2 months ago	26-39463 26 days
27753	YunkaiZhang233 author:YunkaiZhang233	feat(CategoryTheory): implemented proofs for factorisation categories being equivalent to iterated comma categories in two ways	--- Completed one of the tasks in TODOs, shown and implemented the details for (X/C)/f ≌ Factorisation f ≌ f/(C/Y). This is migrated from my previous PR #22390 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	70/1	Mathlib/CategoryTheory/Category/Factorisation.lean	1	12	['YunkaiZhang233', 'b-mehta', 'github-actions', 'robin-carlier']	nobody	63-42690 2 months ago	64-38571 2 months ago	0-3448 57 minutes
26483	metakunt author:metakunt	feat (RingTheory/RootsOfUnity/PrimitiveRoots) : Add equiv_primitiveRoots_of_coprimePow	Adds equivalence of r-th primitive roots by a coprime e.	t-ring-theory new-contributor awaiting-author	79/0	Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean	1	13	['Citronhat', 'Ruben-VandeVelde', 'github-actions', 'metakunt']	nobody	59-61391 1 month ago	59-61391 1 month ago	28-81831 28 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	57-5845 1 month ago	64-41894 2 months ago	91-29730 91 days
26901	5hv5hvnk author:5hv5hvnk	feat: a simproc version of `compute_degree`	Wrap `compute_degree` in a simproc for use by simp. Closes #22219. ---	new-contributor awaiting-CI t-meta awaiting-author	198/0	Mathlib.lean,Mathlib/Tactic/Simproc/PolynomialDegree.lean,MathlibTest/polynomial_degree_simproc.lean	3	18	['5hv5hvnk', 'YaelDillies', 'adomani', 'github-actions']	nobody	53-54809 1 month ago	53-54809 1 month ago	2-71043 2 days
27850	fyqing author:fyqing	feat: 0-dimensional manifolds are discrete and countable	This is the converse direction of the classification of 0-dimensional manifolds. The other direction was shown in #22105. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-differential-geometry awaiting-author	80/0	Mathlib.lean,Mathlib/Geometry/Manifold/ZeroDim.lean	2	13	['fyqing', 'github-actions', 'grunweg', 'tb65536']	grunweg assignee:grunweg	53-52417 1 month ago	63-13233 2 months ago	0-6418 1 hour
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	53-5857 1 month ago	84-44984 2 months ago	84-45028 84 days
27226	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): Add Subgraph.inclusion_edge_apply_coe and inclusion_edgeSet_apply_coe	This PR continues the work from #25248. Original PR: https://github.com/leanprover-community/mathlib4/pull/25248	new-contributor t-combinatorics awaiting-author	14/0	Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	1	3	['b-mehta', 'github-actions', 'xcloudyunx']	b-mehta assignee:b-mehta	52-80204 1 month ago	53-7884 1 month ago	25-83942 25 days
22925	ggranberry author:ggranberry	feat(Mathlib/PlaceHolder/ToeplitzHausdorff): Toeplitz-Hausdorff	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	will-close-soon new-contributor t-analysis awaiting-author WIP help-wanted	411/0	Mathlib/PlaceHolder/ToeplitzHausdorff.lean,Mathlib/PlaceHolder/ToeplitzHausdorff_v2.lean	2	11	['faenuccio', 'ggranberry', 'github-actions']	faenuccio assignee:faenuccio	51-56328 1 month ago	51-56531 1 month ago	4-24257 4 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	47-5837 1 month ago	54-19073 1 month ago	54-19111 54 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	45-5860 1 month ago	56-24329 1 month ago	56-24366 56 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	45-5857 1 month ago	54-37187 1 month ago	54-37227 54 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	41-41465 1 month ago	41-41621 1 month ago	41-41654 41 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	41-38654 1 month ago	77-67100 2 months ago	77-67135 77 days
27479	iu-isgood author:iu-isgood	feat: Abel's Binomial Theorem	We have formalized Abel's Binomial Theorem as part of an REU project. There are a few remaining sorrys, but we will finish them soon. I will edit this PR message later according to community rules. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	326/0	Mathlib/Data/Nat/Choose/AbelBinomial.lean	1	28	['ElifUskuplu', 'FrankieNC', 'github-actions', 'iu-isgood']	nobody	41-38636 1 month ago	65-16533 2 months ago	0-533 8 minutes
28215	5hv5hvnk author:5hv5hvnk	Draft PR, for Strong and Weak connectivity for Digraphs	strong and weak connectivity in Digraphs --- Should resolve a part of issue #26771 Main additions in the PR: 1. Walks in Digraphs (Walk.lean) - Basic walk structure with start and end vertices - Support for walk operations: append, reverse, length - Support functions: getVert, copy, support 2. Walk Decompositions (WalkDecomp.lean) - takeUntil and dropUntil functions to split walks - rotate operation for loop walks - Theorems relating to walk decomposition properties 3. Subgraphs (subgraph.lean) - Subgraph structure for digraphs - Induced and spanning subgraph predicates - Lattice structure (sup, inf, top, bot) - Coercion to standalone digraphs 4. Paths (Paths.lean) - Trail, Path, Circuit, Cycle definitions - Path structure with no repeating vertices - Theorems relating different path types - Basic connectivity definitions (reachable, weakly/strongly connected) 5. Connectivity (Connected.lean) - Reachability relations and properties - Strong and weak connectivity definitions - Connected component types: - StronglyConnectedComponent - WeaklyConnectedComponent - ConnectedComponent - Component properties and equivalence relations --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics awaiting-author	1216/0	Mathlib/Combinatorics/Digraph/Connected.lean,Mathlib/Combinatorics/Digraph/Paths.lean,Mathlib/Combinatorics/Digraph/Subgraph.lean,Mathlib/Combinatorics/Digraph/Walk.lean,Mathlib/Combinatorics/Digraph/WalkDecomp.lean	5	3	['github-actions', 'grunweg']	nobody	41-37219 1 month ago	41-37219 1 month ago	12-41939 12 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	41-5144 1 month ago	42-71632 1 month ago	42-71675 42 days
24333	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): cycle graph implementation for generic vertex types	The existing `cycleGraph` implementation under Combinatorics/SimpleGraph/Circulant.lean only operates over `Fin n`. This PR implements a cycle graph implementation over any generic vertex type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics awaiting-author	187/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Cycle.lean	2	41	['IvanRenison', 'github-actions', 'vlad902']	kmill assignee:kmill	39-66695 1 month ago	39-66695 1 month ago	123-22718 123 days
27155	Pjotr5 author:Pjotr5	feat: Shearer's bound on the independence number of triangle free graphs	I added the file IndependenceNumber.lean to the Mathlib.Combinatorics.SimpleGraph.Triangle folder. It contains a proof of a theorem by Shearer on the independence number of triangle-free graphs . I was told this might be useful to add to Mathlib a Zullip thread linked [here](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Convexity.20of.20a.20specific.20function/with/510469526). I tried to comply as much as I could with the Mathlib style guide, but I realise that there is probably still a significant amount of editing to be done. For one thing: there are probably some lemmas and theorems in there that might be better suited in other files, but since this is my first PR I though I would all put it in one file before starting to edit a bunch of files. I was also advised to split up the file into multiple smaller PRs, but since everything is basically serving this one proof I could not really find a natural way to do that. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics awaiting-author	1266/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/IndependenceNumber.lean	2	9	['Pjotr5', 'github-actions', 'grunweg']	nobody	38-69663 1 month ago	41-37872 1 month ago	39-17587 39 days
27242	hugh-fox author:hugh-fox	feat: add Gauss-like formula for sums of digit sums	Adds `sum_digit_sum_base_pow_eq` to show a Gauss-like formula across sums of digit sums. This relies on an additional two simp lemmas, named `digits_sum_eq_self`, `digits_sum_base_mul_cancel`. Lastly, includes a specialization (which is a good bit simpler than the general formula) to base 10 named `sum_digit_sum_ten_pow_eq`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data new-contributor awaiting-author	113/0	Mathlib/Data/Nat/Digits/Lemmas.lean	1	5	['github-actions', 'hugh-fox', 'kckennylau']	nobody	38-44632 1 month ago	38-44632 1 month ago	39-41606 39 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	38-18089 1 month ago	41-77798 1 month ago	42-32477 42 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	37-54501 1 month ago	130-11627 4 months ago	130-11672 130 days
27261	Sebi-Kumar author:Sebi-Kumar	feat(Topology): add definition for subpaths	Define subpaths as restrictions of paths to subintervals, reparameterized to have domain `[0, 1]` and possibly with a reverse of direction. Prove their basic properties. This serves as an alternative to `Path.truncate` which is useful for the explicit construction of certain homotopies, in particular regarding the concatenation of subpaths. --- To provide additional context, this is my first time contributing to Mathlib, and I am doing so as a part of the Fields Undergraduate Summer Research Program hosted at Western University. My intention for this file is for it to be used when proving that the fundamental group of the sphere is trivial (following the proof from Hatcher's "Algebraic Topology"). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology awaiting-author	146/0	Mathlib.lean,Mathlib/Topology/Subpath.lean	2	24	['ADedecker', 'FrankieNC', 'Sebi-Kumar', 'github-actions', 'themathqueen', 'wwylele']	ADedecker assignee:ADedecker	37-46072 1 month ago	43-14563 1 month ago	34-15767 34 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	36-36055 1 month ago	45-63218 1 month ago	45-63254 45 days
26156	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure) : add a definition of total variation for VectorMeasure	This PR adds variation for any `VectorMeasure` using a supremum definition. Currently mathlib has `TotalVariation` defined for a signed measure using the Hahn-Jordan decomposition, but this doesn't generalise. Motivation: generally this is an important concept but specifically as a step for proving RMK in the complex case which in turn is a step to prove the spectral theorem. Co-authored-by: @yoh-tanimoto This PR was migrated from #25442. PR divided into smaller pieces, this is just the definition without additional lemmas. PRs adding further results related to variation are: * #26160 * #26165 * #26168 (shows that for `SignedMeasures` the two definitions of variation coincide) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	358/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean	2	32	['EtienneC30', 'github-actions', 'yoh-tanimoto']	EtienneC30 assignee:EtienneC30	33-45099 1 month ago	64-38219 2 months ago	42-9361 42 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	33-5832 1 month ago	43-49086 1 month ago	45-25928 45 days
26710	metakunt author:metakunt	feat (Data/Nat/Digits/Lemmas): Add digits_getD	Adds digits_getD, an explicit computation of the i-th digits of n in base b representation.	t-data new-contributor awaiting-author	48/0	Mathlib/Data/Nat/Digits/Lemmas.lean	1	8	['github-actions', 'pechersky', 'plp127']	nobody	32-24054 1 month ago	35-23245 1 month ago	56-72456 56 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	32-5857 1 month ago	46-41333 1 month ago	46-41369 46 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	30-5863 1 month ago	39-32430 1 month ago	39-32463 39 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	29-74533 29 days ago	90-37659 2 months ago	90-37697 90 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	29-71067 29 days ago	84-62219 2 months ago	84-62255 84 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	28-58310 28 days ago	28-58310 28 days ago	34-44492 34 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	28-5860 28 days ago	37-12753 1 month ago	37-13190 37 days
26881	emo916math author:emo916math	feat(Analysis/Calculus/Deriv/Star) A formula for `deriv (conj ∘ f ∘ conj)`	Added a lemma that `deriv (conj ∘ f ∘ conj) = conj ∘ deriv f ∘ conj`, proved by cases on whether the derivative mathematically exists or not. This PR replaces [#26805](https://github.com/leanprover-community/mathlib4/pull/26805); see discussion there. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author	50/2	Mathlib/Analysis/Calculus/Deriv/Star.lean	1	15	['emo916math', 'github-actions', 'j-loreaux', 'kckennylau']	j-loreaux assignee:j-loreaux	25-39935 25 days ago	56-39489 1 month ago	31-70593 31 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	25-31726 25 days ago	25-36730 25 days ago	95-39039 95 days
26462	PSchwahn author:PSchwahn	feat(LinearAlgebra/Projection): add results about inverse of `Submodule.prodEquivOfIsCompl`	Add two theorems `Submodule.prodEquivOfIsCompl_symm_apply` and `Submodule.prodEquivOfIsCompl_symm_add`, which are API for `Submodule.prodEquivOfIsCompl`. We believe these theorems are useful; for example, we have used their statements in a [classification formalization project](https://github.com/LieLean/LowDimSolvClassification). Co-authored by: - [Viviana del Barco](https://github.com/vdelbarc) - [Gustavo Infanti](https://github.com/GuQOliveira) - [Exequiel Rivas](https://github.com/erivas) --- I am not sure whether the `prodEquivOfIsCompl_symm_apply` theorem should be tagged with `@[simp]`; this might lead to confluence issues. Opinions are welcome! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	10/0	Mathlib/LinearAlgebra/Projection.lean	1	7	['PSchwahn', 'github-actions', 'joelriou', 'kckennylau']	joelriou assignee:joelriou	25-10004 25 days ago	25-41107 25 days ago	73-43225 73 days
29434	ntapiam author:ntapiam	feat(NonAssoc/LieAdmissible): prove every ring/algebra is LieAdmissible	-awaiting-author	new-contributor t-algebra label:t-algebra$	27/6	Mathlib/Algebra/NonAssoc/LieAdmissible/Defs.lean	1	1	['github-actions']	nobody	24-67783 24 days ago	25-60559 25 days ago	25-60597 25 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	24-30828 24 days ago	87-23458 2 months ago	87-23498 87 days
28286	bwangpj author:bwangpj	feat(Geometry/Manifold/ContMDiff): basic lemmas for analytic (`C^ω`) functions	Add basic lemmas relating `ContMDiff` in the `C^ω` case to being `Analytic` on charts. This is upstreamed from [https://github.com/girving/ray](https://github.com/girving/ray). Co-authored-by: Geoffrey Irving --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-differential-geometry awaiting-author	36/0	Mathlib/Geometry/Manifold/ContMDiff/Defs.lean	1	13	['bwangpj', 'girving', 'github-actions', 'grunweg', 'kbuzzard', 'sgouezel']	sgouezel assignee:sgouezel	24-24759 24 days ago	24-65194 24 days ago	27-76128 27 days
25778	thefundamentaltheor3m author:thefundamentaltheor3m	feat: Monotonicity of `setIntegral` for nonnegative functions	This PR makes it easier to prove monotonicity of the Bochner integral on sets for nonnegative functions by removing the stronger assumption required by the general monotonicity lemma that both of the functions being compared must be integrable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	8/0	Mathlib/MeasureTheory/Integral/Bochner/Set.lean	1	6	['RemyDegenne', 'github-actions', 'sgouezel', 'thefundamentaltheor3m']	nobody	22-40628 22 days ago	113-48461 3 months ago	0-11893 3 hours
26039	tsuki8 author:tsuki8	feat(RingTheory/MvPolynomial/MonomialOrder): leadingTerm	define the leadingTerm and prove some lemmas related to the def `leadingTerm`: the leading term of `f` for the monomial ordering `m` some basic lemmas about leadingTerm including: 1. `leadingTerm_eq_zero_iff` 2. `leadingTerm_image_sdiff_singleton_zero` 3. `leadingTerm_image_insert_zero` 4. `leadingTerm_zero` 5. `leadingTerm_degree_eq` 6. `leadingTerm_degree_eq'` some lemmas about the degree of `f - m.leadingTerm f`: 1. `degree_sub_leadingTerm` 2. `degree_sub_leadingTerm_lt_degree` 3. `degree_sub_leadingTerm_lt_iff` Co-authored-by: Junyu Guo @Hagb --- - [ ] depends on: #24361 - [ ] depends on: #26148 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor awaiting-author	99/1	Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean	1	20	['Hagb', 'chrisflav', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	22-21851 22 days ago	22-21851 22 days ago	12-45707 12 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	16-73800 16 days ago	59-35693 1 month ago	73-53225 73 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	16-53044 16 days ago	16-53065 16 days ago	25-40554 25 days
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	16-33881 16 days ago	29-10598 29 days ago	104-38389 104 days
29776	yuanyi-350 author:yuanyi-350	chore(Functional Analysis) : refactor `ContinuousLinearMap.isOpenMap` by separating it into sublemmas	The open mapping theorem in mathlib proves A ⇒ C by first proving A ⇒ B and then B ⇒ C in one theorem. In my PR, I separated it into two theorems: A ⇒ B and B ⇒ C. And now B ⇒ C is more general, with weaker assumptions than A ⇒ C. The [open mapping theorem](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Normed/Operator/Banach.html#ContinuousLinearMap.isOpenMap) in mathlib need `f` to be surjective. However, this can be weakened to the condition `h : ∃ (n : ℕ) (x : _), x ∈ interior (closure (f '' ball 0 n))` . I need this stronger formulation to prove the closed range theorem c.f. Rudin Functional Analysis Thm 4.13 [zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/refactor.20.60ContinuousLinearMap.2EisOpenMap.60) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author WIP	44/24	Mathlib/Analysis/Normed/Operator/Banach.lean	1	12	['faenuccio', 'github-actions', 'kckennylau', 'leanprover-bot', 'themathqueen', 'yuanyi-350']	faenuccio assignee:faenuccio	12-49879 12 days ago	13-4014 13 days ago	2-46827 2 days
29744	espottesmith author:espottesmith	feat(Combinatorics): define directed hypergraphs	This PR defines directed hypergraphs: ``` @[ext] structure DiHypergraph (α : Type*) where /-- The vertex set -/ vertexSet : Set α /-- The edge set -/ edgeSet : Set ((Set α) × (Set α)) /-- Each edge is a pair (s, d), where s ⊆ vertexSet and d ⊆ vertexSet -/ edge_src_dst_isSubset_vertexSet' : ∀ ⦃e⦄, e ∈ edgeSet → e.1 ⊆ vertexSet ∧ e.2 ⊆ vertexSet ``` Additional definitions: - tail/head stars and negative/positive stars - some special cases (B-Graph, F-Graph, BF-Graph, and what I'm calling a "non-endless" dihypergraph, where neither the source/tail nor the destination/head are empty) - Vertex and (hyper)edge adjacency - isolated vertices - empty and nonempty dihypergraphs The design employed here is based off of #28613, but this PR does not depend on that one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	391/0	Mathlib.lean,Mathlib/Combinatorics/DiHypergraph/Basic.lean	2	1	['github-actions']	nobody	11-48323 11 days ago	16-54856 16 days ago	16-54901 16 days
29827	js2357 author:js2357	feat: define two (trivial) ContinuousMulEquivs	Define two trivial `ContinuousMulEquiv`s: `ContinuousMulEquiv.piUnique` is the topological version of `MulEquiv.piUnique`. `ContinuousMulEquiv.piEquivPiSubtypeProd` is the multiplicative version of `Homeomorph.piEquivPiSubtypeProd`. Done for the FLT project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import FLT new-contributor t-topology	25/0	Mathlib/Topology/Algebra/ContinuousMonoidHom.lean	1	2	['github-actions', 'grunweg']	nobody	11-20807 11 days ago	13-57944 13 days ago	14-127 14 days
29458	LiamSchilling author:LiamSchilling	feat(MvPolynomial/WeightedHomogenous): relate `weightedTotalDegree` to `degrees`, `totalDegree`, and `degreeOf`	`weightedTotalDegree` is the most general notion of multivariate degree in mathlib. These theorems show that it specializes to `degrees`, `totalDegree`, and `degreeOf` with specialized weights. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor awaiting-author	24/1	Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean	1	5	['chrisflav', 'github-actions']	chrisflav assignee:chrisflav	10-58892 10 days ago	10-58892 10 days ago	14-19311 14 days
26660	strihanje01 author:strihanje01	feat(Combinatorics/Additive/VerySmallDoubling): weak non-commutative Kneser's theorem	add theorem about the structure of a doubling smaller than the golden ratio --- - [x] depends on: #28653 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import maintainer-merge new-contributor t-combinatorics	215/41	Mathlib/Algebra/Group/Action/Pointwise/Finset.lean,Mathlib/Combinatorics/Additive/VerySmallDoubling.lean	2	79	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'strihanje01']	YaelDillies assignee:YaelDillies	10-48371 10 days ago	10-81020 10 days ago	52-22996 52 days
28175	dsfxcimk author:dsfxcimk	feat: exterior angle theorem	Add Exterior angle theorem --- The Exterior Angle Theorem states that the exterior angle of a triangle equals the sum of the two non-adjacent interior angles. I plan to place this in Mathlib.Geometry.Euclidean.Triangle [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-euclidean-geometry awaiting-author	10/0	Mathlib/Geometry/Euclidean/Triangle.lean,docs/1000.yaml	2	16	['FrankieNC', 'JovanGerb', 'dsfxcimk', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'themathqueen']	nobody	10-35715 10 days ago	24-48582 24 days ago	28-57160 28 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	29/15	Counterexamples/AharoniKorman.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/Topology/Separation/Hausdorff.lean	4	18	['NotWearingPants', 'eric-wieser', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	10-8868 10 days ago	21-29352 21 days ago	39-44291 39 days
27817	zhuyizheng author:zhuyizheng	feat: add IMO2025P1	Add a solution to IMO2025P1, the original problem statement from https://github.com/jsm28/IMOLean --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO new-contributor	1310/0	Archive.lean,Archive/Imo/Imo2025Q1.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	dwrensha assignee:dwrensha	9-55374 9 days ago	14-74846 14 days ago	47-13552 47 days
29588	Periecle author:Periecle	feat(Analysis/Complex/Residue): Implement residue theory for complex functions at isolated singularities	# Add basic residue theory for complex functions This PR introduces the residue theory implementation in mathlib. ## Main additions - `HasIsolatedSingularityAt f c`: Predicate for functions with isolated singularities at point `c` - `residue f c hf`: The residue of `f` at isolated singularity `c`, defined via circle integrals - Radius independence: `residue_eq_two_pi_I_inv_smul_circleIntegral` - residue equals normalized circle integral for any valid radius - Holomorphic residues: `residue_of_holomorphic` - functions holomorphic in a neighborhood have zero residue - Simple pole formula: `residue_simple_pole` - for `f(z) = (z-c)⁻¹ * g(z)`, residue equals `g(c)` ## Implementation notes - Builds on existing circle integral infrastructure in `CauchyIntegral.lean` - Uses `Classical.choose` to extract witness radius from isolated singularity condition - Comprehensive documentation with mathematical context and examples - Establishes foundation for residue theorem, argument principle, and other applications ## Examples included - `residue(1/z, 0) = 1` (canonical simple pole) - Radius independence demonstration - Zero residues for holomorphic functions This provides the essential building blocks for complex analysis and first step to formalize residue theory.	new-contributor t-analysis awaiting-author	383/0	Mathlib/Analysis/Complex/Residue/Basic.lean	1	17	['Periecle', 'github-actions', 'hrmacbeth', 'llllvvuu', 'loefflerd']	nobody	9-44106 9 days ago	20-46209 20 days ago	1-5255 1 day
26071	linesthatinterlace author:linesthatinterlace	feat: Add `id` and `comp` classes for `FunLike` and `refl`, `trans` and `symm` classes for `EquivLike`	Adds classes depending on `FunLike` that capture "this has an identity/this has a notion of composition". --- This is a prototype and comments on this are requested. I think a similar model could be used to create a generalisation for Equiv.symm. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor RFC WIP	314/23	Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/FunLike/Equiv.lean,Mathlib/Logic/Equiv/Defs.lean	3	21	['Rob23oba', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	9-40373 9 days ago	9-40429 9 days ago	0-1 1 second
28871	JaafarTanoukhi author:JaafarTanoukhi	feat(Combinatorics/Digraph): Tournaments	Define orientations and tournaments. Related to #26771. Co-authored-by: Rida Hamadani --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	62/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Digraph/Tournament.lean	3	5	['JaafarTanoukhi', 'NotWearingPants', 'Rida-Hamadani', 'github-actions']	kmill assignee:kmill	9-35507 9 days ago	40-25744 1 month ago	40-25778 40 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	9-26821 9 days ago	25-20993 25 days ago	38-36905 38 days
29947	JaafarTanoukhi author:JaafarTanoukhi	feat(Combinatorics/Digraph): Maps	Ported `SimpleGraph/Maps.lean` to `Digraph/Maps.lean` for future PRs related to issue #[26771](https://github.com/leanprover-community/mathlib4/issues/26771) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	476/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Maps.lean	2	1	['github-actions']	nobody	8-62686 8 days ago	9-35789 9 days ago	9-35829 9 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 delegated	142/2	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramMatrix.lean,Mathlib/MeasureTheory/Function/L2Space.lean	3	42	['EtienneC30', 'eric-wieser', 'github-actions', 'mathlib-bors', 'pfaffelh', 'sgouezel']	hrmacbeth assignee:hrmacbeth	8-61141 8 days ago	8-61141 8 days ago	78-69916 78 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 FLT new-contributor	97/0	Mathlib/GroupTheory/DoubleCoset.lean	1	16	['Ruben-VandeVelde', 'WilliamCoram', 'github-actions', 'mathlib4-merge-conflict-bot']	mariainesdff assignee:mariainesdff	8-56887 8 days ago	15-32532 15 days ago	74-12007 74 days
29798	Cyantain author:Cyantain	feat(FieldTheory/IsIntegrallyClosed): lemma to judge whether an element is integral	In this PR, we proved that an element is integral iff it's root of irreducible polynomial with unit leading coeff, which is an easy way to judge an element is integral or not, such as $\sqrt 5 / 4$, because it's root of $16x^2-5$ with not unit leading coeff, so it's not integral.	new-contributor t-algebra delegated label:t-algebra$	13/0	Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean	1	8	['Ruben-VandeVelde', 'adomani', 'github-actions', 'kckennylau', 'mathlib-bors', 'riccardobrasca']	nobody	8-49705 8 days ago	8-49705 8 days ago	6-29891 6 days
28728	or4nge19 author:or4nge19	feat(PerronFrobenius): introduce Irreducible and Primitive Matrices and relations to Quiver	This PR develops a graph-theoretic interface for studying nonnegative square matrices over `ℝ` through the quiver formed by their strictly positive entries. It shows the equivalence between positivity of suitable matrix powers and existence of directed paths in this quiver. ------------ - [ ] depends on: #28696 - [ ] depends on:#29754 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-author	289/0	Mathlib.lean,Mathlib/Combinatorics/Quiver/Path/StronglyConnected.lean,Mathlib/LinearAlgebra/Matrix/Irreducible/Defs.lean	3	6	['github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'or4nge19']	nobody	7-62867 7 days ago	20-27827 20 days ago	0-32474 9 hours
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/)	awaiting-zulip maintainer-merge new-contributor	158/0	Counterexamples.lean,Counterexamples/EulerSumOfPowers.lean	2	43	['MichaelStollBayreuth', 'NotWearingPants', 'eric-wieser', 'github-actions', 'tb65536', 'urkud']	MichaelStollBayreuth assignee:MichaelStollBayreuth	7-24820 7 days ago	7-24876 7 days ago	24-25032 24 days
12751	Command-Master author:Command-Master	feat: add lemmas for Nat/Bits, Nat/Bitwise and Nat/Size	Remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict	66/7	Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Size.lean	4	26	['Command-Master', 'Rida-Hamadani', 'Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'jcommelin']	nobody	410-43580 1 year ago	415-59822 1 year ago	54-52408 54 days
9605	davikrehalt author:davikrehalt	feat(Data/Finset & List): Add Lemmas for Sorting and Filtering	This PR includes several useful lemmas to the Data/Finset and Data/List modules in Lean's mathlib: 1. `toFinset_filter` (List): Shows that filtering commutes with toFinset. 2. `toFinset_is_singleton_implies_replicate` (List): Shows a list with a singleton toFinset is a List.replicate. 3. `filter_sort_commute` (Finset): Sorting and filtering can be interchanged in Finsets. 4. `Sorted.filter` (List): A sorted list stays sorted after filtering. 5. `Sorted.append_largest` (List): Appending the largest element keeps a list sorted. 6. `sort_monotone_map` (Finset): Relates sorting of a Finset after mapping to sorting of a list. 7. `sort_insert_largest` (Finset): Sorting a Finset with an inserted largest element. 8. `sort_range` (Finset): Sorting a range in a Finset equals the corresponding range list. 9. ~~`filter_eval_true` (List): Filtering a list with a predicate always true keeps the list unchanged.~~ 10. ~~`filter_eval_false` (List): Filtering with an always-false predicate gives an empty list.~~ 11. ~~`pairwise_concat` (List): Iff condition for Pairwise relation in concatenated lists (similar to pairwise_join).~~ 12. `list_map_toFinset` (Finset): toFinset commutes with map under injection --- - [x] depends on: #15952 This is my first PR to mathlib, so I'm not too familiar with etiquette's and more specifically there are two proofs in the PR which uses aesop, and I am not sure if it's frowned upon. I kept the aesop in there for now as I couldn't construct very short proofs otherwise. The sort_range function proof was suggested in https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Computing.20Finset.20sort.20of.20Finset.20range/near/410346731 by Ruben Van de Velde. Thanks for your time for improving this PR.	t-data new-contributor merge-conflict please-adopt awaiting-author	71/0	Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Sort.lean	4	30	['YaelDillies', 'davikrehalt', 'eric-wieser', 'github-actions', 'jcommelin', 'leanprover-community-mathlib4-bot', 'urkud', 'vihdzp']	YaelDillies assignee:YaelDillies	338-19419 11 months ago	364-74610 11 months ago	12-48560 12 days
14598	Command-Master author:Command-Master	chore: add typeclasses to unify various `add_top`, `add_eq_top`, etc.	Add the four typeclasses `IsTopAbsorbing`, `IsBotAbsorbing`, `NoTopSum`, `NoBotSum`, as additive equivalents for `MulZeroClass` and `NoZeroDivisors`. Add instances of these for `ENNReal`, `WithTop α`, `WithBot α`, `PUnit`, `EReal`, `PartENat`, `Measure`, `Interval` and `Filter`. Also split `Algebra/Order/AddGroupWithTop` to `Algebra/Order/Group/WithTop` and `Algebra/Order/Monoid/WithTop` --- Previous usages of lemmas with quantified names like `WithTop.add_top` have to be changed to just `add_top`. `add_lt_top` is `@[simp]`, in accordance with `ENNReal.add_lt_top` being `@[simp]`. This affects `WithTop.add_lt_top` which previously hadn't been `@[simp]`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order t-algebra merge-conflict label:t-algebra$	264/195	Archive/Wiedijk100Theorems/BallotProblem.lean,Mathlib.lean,Mathlib/Algebra/Order/Group/WithTop.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/PUnitInstances/Order.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Analytic/Meromorphic.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/NormedSpace/ENorm.lean,Mathlib/Analysis/SpecialFunctions/JapaneseBracket.lean,Mathlib/Analysis/SpecialFunctions/Log/ENNRealLog.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Nat/WithBot.lean,Mathlib/Data/Real/EReal.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Decomposition/Lebesgue.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSpace.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean,Mathlib/MeasureTheory/Integral/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Martingale/Convergence.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/UniqueFactorizationDomain.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/MetricSpace/Lipschitz.lean	57	30	['Command-Master', 'YaelDillies', 'github-actions']	nobody	331-76385 10 months ago	331-76385 10 months ago	7-45599 7 days
16885	metinersin author:metinersin	feat(ModelTheory/Complexity): define literals	Defines `FirstOrder.Language.BoundedFormula.IsLiteral` and `FirstOrder.Language.BoundedFormula.simpleNot` - an auxiliary operation that takes the negation of a formula and does some simplification. --- - [x] depends on: #16800 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict awaiting-author	148/5	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	4	20	['YaelDillies', 'awainverse', 'github-actions', 'mathlib4-dependent-issues-bot', 'metinersin']	nobody	329-32506 10 months ago	329-32506 10 months ago	0-19926 5 hours
13248	hcWang942 author:hcWang942	feat: basic concepts of auction theory	## Description Formalise some core concepts and results in auction theory: this includes definitions for first-price and second-price auctions, as well as several fundamental results and helping lemmas. This is the very first PR of the project formalizing core concepts and results in auction theory. Our group is working on more contributions on the formalization of game theory prefix. Co-authored-by: Ma Jiajun ## Reference Roughgarden, Tim. *Twenty Lectures on Algorithmic Game Theory*. Cambridge University Press, 2020. [Link](https://www.cambridge.org/core/books/twenty-lectures-on-algorithmic-game-theory/A9D9427C8F43E7DAEF8C702755B6D72B) --- - [x] Will depend on #14163 once that PR is merged. The Fintype lemmas introduced by this PR have been added in that PR and will be removed from here once that PR gets merged ## Current plan for formalization of Game Theory The current plan for the formalizing of Game Theory include: #### 1. Auction Theory. 🎉 _(200+ lines, this PR)_ - Essential definitions of Sealed-bid auction, First-price auction and Second-price auction. - First-price auction has no dominant strategy. - Second-price auction has dominant strategy. (Second-price auction is DSIC) #### 2. Mechanism design & Myerson's Lemma. 🎉 (400+ lines, pending for modification to Mathlib Standard) - Mechanism design An allocation rule is implementable if there exists - Dominant Strategy Incentive Compatible (DSIC) payment rule - An allocation rule is monotone if for every bidder’s gain is nondecreasing w.r.t. her/his bid - Myerson's Lemma Implementable ⇔ Monotone In the above case, the DSIC payment rule is unique. #### 3. von Neumann‘s Minimax Theorem. 🎉 (800+ lines, pending for modification to Mathlib Standard) - Equilibrium in zero sum game - Formalization strategy: via Loomis’s theorem. #### 4. Nash Equilibrium. 🎉 (pending for modification to Mathlib Standard) #### 5. Brouwer fixed-point theorem. (Work in Progress) #### 6. More Mechanism design. (Planning)	new-contributor t-logic merge-conflict awaiting-author	204/0	Mathlib.lean,Mathlib/GameTheory/Auction/Basic.lean,docs/references.bib	3	148	['Shreyas4991', 'YaelDillies', 'eric-wieser', 'faenuccio', 'github-actions', 'grunweg', 'hcWang942', 'tb65536', 'urkud', 'vihdzp']	hcWang942 assignee:hcWang942	324-71338 10 months ago	unknown	unknown
19125	yhtq author:yhtq	feat: add theorems to transfer `IsGalois` between pairs of fraction rings	feat: add theorems to transfer `IsGalois` between pairs of fraction rings. - [x] depends on: #18404 - [x] depends on: #19124 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict label:t-algebra$	121/0	Mathlib.lean,Mathlib/FieldTheory/Galois/IsFractionRing.lean,Mathlib/RingTheory/Localization/FractionRing.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	295-7355 9 months ago	301-42778 9 months ago	0-4534 1 hour
17739	Aaron1011 author:Aaron1011	feat(Topology/Order/DenselyOrdered): prove Not (IsOpen) for intervals	Prove that Iic/Ici/Ioc/Ico/Icc intervals are not open in densely ordered topologies with no min/max element --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology merge-conflict awaiting-author	27/0	Mathlib/Topology/Order/DenselyOrdered.lean	1	8	['github-actions', 'vihdzp']	nobody	261-29367 8 months ago	261-29367 8 months ago	0-4704 1 hour
15711	znssong author:znssong	feat(Combinatorics/SimpleGraph): Some lemmas about walk, cycle and Hamiltonian cycle	--- These lemmas are separated from the `meow-sister/BondyChvatal` branch and will be needed for the proof of the Bondy-Chvátal theorem. - [x] depends on: #15536 - [x] depends on: #16294	new-contributor t-combinatorics merge-conflict awaiting-author	407/3	Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean	4	22	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'znssong']	nobody	260-48453 8 months ago	260-48453 8 months ago	9-13962 9 days
18629	tomaz1502 author:tomaz1502	feat(Computability.Timed): Formalization of runtime complexity of List.merge	This PR adds the formalization of the runtime complexity of the merge function, defined in `Data/List/Sort`. Requires: https://github.com/leanprover-community/mathlib4/pull/15450 References: - Previous PR on mathlib3: https://github.com/leanprover-community/mathlib3/pull/14494/ - First discussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/BSc.20Final.20Project/near/220647062 - Second disussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Formalization.20of.20Runtime.20Complexity.20of.20Sorting.20Algorithms/near/284184450 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor merge-conflict awaiting-author	186/0	Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean	3	2	['github-actions', 'trivial1711']	nobody	260-14372 8 months ago	260-14372 8 months ago	33-11262 33 days
19291	PieterCuijpers author:PieterCuijpers	feat(Algebra/Order/Hom): add quantale homomorphism	Definition of quantale homomorphisms as functions that are both semigroup homomorphisms and complete lattice homomorphisms. --- - [x] depends on: #19810 - [x] depends on: #19811 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict awaiting-author label:t-algebra$	209/0	Mathlib.lean,Mathlib/Algebra/Order/Hom/Quantale.lean,scripts/noshake.json	3	29	['PieterCuijpers', 'YaelDillies', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot']	nobody	255-36031 8 months ago	255-36032 8 months ago	36-2255 36 days
20372	jvlmdr author:jvlmdr	feat(MeasureTheory/Function): Add ContinuousLinearMap.bilinearCompLp(L)	Introduce ContinuousLinearMap.bilinearCompLp and bilinearCompLpL. Generalize eLpNorm_le_eLpNorm_mul_eLpNorm theorems to include constant C in bound condition. --- Expect this may be useful for defining tempered distributions from functions in `L^p`. The definitions more or less follow `ContinuousLinearMap.compLp...`. Names are loosely analogous to `ContinuousLinearMap.bilinearComp` and `SchwartzMap.bilinLeftCLM`. Note: I preferred the spelling `hpqr : p⁻¹ + q⁻¹ = r⁻¹` with `f` in `L^p` and `g` in `L^q` to `hpqr : 1 / p = 1 / q + 1 / r`. It's easier to obtain from `ENNReal.IsConjExponent` too. A few questions: - [ ] I defined `bilinear{Left,Right}LpL` in addition to `bilinearCompLpL` because `LinearMap.mkContinuous₂` is marked as `noncomputable` and `LinearMap.mkContinuous` is not. Is this worth the extra definitions? (Note: This is not visible in the source due to `noncomputable section`.) - [ ] Should I use `C : ℝ` instead of `C : NNReal` for `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'`? - [ ] Is it going to be painful to have `[Fact (1 ≤ p)] [Fact (1 ≤ q)] [Fact (1 ≤ r)]`? I don't think there's a way to avoid it though. Maybe providing specialized versions for `p.IsConjExponent q` with `L^1`? Naming: - [ ] Is it satisfactory to add a `'` to the `eLpNorm_le_eLpNorm_mul_eLpNorm ` definitions in `CompareExp.lean` where `≤ ‖f x‖ * ‖g x‖` has been replaced with `≤ C * ‖f x‖ * ‖g x‖`? These could replace the existing theorems, although I don't want to break backwards compatibility. There are 5 instances: `eLpNorm_le_eLpNorm_top_mul_eLpNorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm_top'`, `eLpNorm'_le_eLpNorm'_mul_eLpNorm''`, `eLpNorm_le_eLpNorm_mul_eLpNorm_of_nnnorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'` (I'm not sure why the existing theorem `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm` has an internal `'`) - [ ] Is `bilinearLeftLpL` a suitable name? Other options: `bilinearCompLpLeftL`, `bilinearCompLeftLpL`, `bilinLeftLpL` (analogous to `SchwartzMap.bilinLeftCLM`) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict	203/40	Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace.lean	2	1	['github-actions']	nobody	248-53379 8 months ago	248-53379 8 months ago	27-43617 27 days
17176	arulandu author:arulandu	feat: integrals and integrability with .re	Lemmas for swapping order of .re and integration/integrability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict awaiting-author	49/0	Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean	4	30	['EtienneC30', 'arulandu', 'github-actions', 'loefflerd']	nobody	247-27812 8 months ago	247-27812 8 months ago	9-73631 9 days
19943	AlexLoitzl author:AlexLoitzl	feat(Computability): Add Chomsky Normal Form Grammar and translation	- Define Chomsky normal form grammars - Add language-preserving translation between context-free grammars and Chomsky normal form grammars Co-authored-by: Martin Dvorak martin.dvorak@matfyz.cz --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor merge-conflict awaiting-author	3151/0	Mathlib.lean,Mathlib/Computability/ChomskyNormalForm/Basic.lean,Mathlib/Computability/ChomskyNormalForm/EmptyElimination.lean,Mathlib/Computability/ChomskyNormalForm/LengthRestriction.lean,Mathlib/Computability/ChomskyNormalForm/TerminalRestriction.lean,Mathlib/Computability/ChomskyNormalForm/Translation.lean,Mathlib/Computability/ChomskyNormalForm/UnitElimination.lean,Mathlib/Computability/ContextFreeGrammar.lean	8	59	['AlexLoitzl', 'YaelDillies', 'github-actions', 'kim-em', 'madvorak']	nobody	231-44788 7 months ago	231-44788 7 months ago	37-29014 37 days
21269	CharredLee author:CharredLee	(WIP) feat (CategoryTheory/Topos): Add topos theory content	This code contains basic definitions and results in topos theory, including the definition of a subobject classifier, power objects, and topoi. It is proved that every topos has exponential objects, i.e. "internal homs". The mathematical content follows chapter IV sections 1-2 of Mac Lane and Moerdijk's text "Sheaves in Geometry and Logic". --- - [x] depends on: #21281 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory merge-conflict awaiting-author WIP	1269/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Basic.lean,Mathlib/CategoryTheory/Topos/Classifier.lean,Mathlib/CategoryTheory/Topos/Exponentials.lean,Mathlib/CategoryTheory/Topos/Power.lean	5	10	['CharredLee', 'gio256', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	221-11060 7 months ago	221-11060 7 months ago	0-13879 3 hours
14313	grhkm21 author:grhkm21	feat(RepresentationTheory/FdRep): FdRep is a full subcategory of Rep	``` /-- Equivalence between `FDRep` and the full subcategory of finite dimensional `Rep`. -/ def equivFiniteDimensional : FDRep k G ≌ FullSubcategory (fun V : Rep k G ↦ FiniteDimensional k V) ```	new-contributor t-algebra t-category-theory merge-conflict label:t-algebra$	47/8	Mathlib/RepresentationTheory/FDRep.lean	1	19	['github-actions', 'grhkm21', 'joelriou', 'kim-em', 'mathlib-bors']	nobody	217-53386 7 months ago	217-53386 7 months ago	125-12755 125 days
18626	hannahfechtner author:hannahfechtner	feat : define Artin braid groups	Define the Artin braid group on infinitely many strands. Includes a toGroup function which defines a function out of the braid group to any other group (given a function which satisfies the braid relations) (more to come in this file; next up: Artin braid groups on finitely many strands) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict awaiting-author label:t-algebra$	91/0	Mathlib.lean,Mathlib/GroupTheory/SpecificGroups/BraidGroup/Basic.lean	2	22	['github-actions', 'hannahfechtner', 'jcommelin', 'joelriou']	nobody	216-37697 7 months ago	216-37697 7 months ago	15-40648 15 days
21959	BGuillemet author:BGuillemet	feat(Topology/ContinuousMap): Stone-Weierstrass theorem for MvPolynomial	Add the subalgebra of multivariate polynomials and prove it separates points, on the same model as `ContinuousMap/Polynomial.lean`. Prove the Stone-Weierstrass theorem and some variations for multivariate polynomials. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology merge-conflict	285/1	Mathlib.lean,Mathlib/Topology/ContinuousMap/MvPolynomial.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	3	1	['github-actions']	nobody	212-39400 6 months ago	212-39400 6 months ago	16-76141 16 days
15578	znssong author:znssong	feat(Function): Fixed points of function `f` with `f(x) >= x`	We added some lemmas of fixed points of function `f` with `f(x) >= x`, where `f : α → α` is a function on a finite type `α`. This will be needed in proof of Bondy-Chvátal theorem. --- See also branch `meow-sister/BondyChvatal`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict awaiting-author	82/0	Mathlib.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Increasing.lean	3	32	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'urkud', 'vihdzp', 'znssong']	nobody	204-35226 6 months ago	204-35226 6 months ago	29-48368 29 days
21018	markimunro author:markimunro	feat(Data/Matrix): add file with key definitions and theorems about elementary row operations	Prove that each elementary row operation is equivalent to a multiplication by an elementary matrix, has another row operation which inverts it, and that each elementary matrix has a left inverse. This is a very large PR and I understand it will take time. This is my first one and will likely have issues but I will be ready to answer questions/fix them as soon as possible. Co-authored-by: Christopher Lynch --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict awaiting-author enhancement	1230/0	Mathlib.lean,Mathlib/Data/Matrix/ElementaryRowOperations.lean,Mathlib/Data/Matrix/GaussianElimination.lean,Mathlib/Data/Matrix/GaussianEliminationOld,Mathlib/Data/Matrix/oldnames,et --hard 18533caba32,lean-toolchain	7	n/a	['chrisflav', 'eric-wieser', 'github-actions', 'j-loreaux', 'markimunro']	nobody	185-70625 6 months ago	unknown	unknown
15212	victorliu5296 author:victorliu5296	feat: Add fundamental theorem of calculus-2 for Banach spaces	add the Mean Value Theorem for Banach spaces to the library and include reference for the theorem statement This theorem states that if `f : X → Y` is differentiable along the line segment from `a` to `b`, then the change in `f` equals the integral of its derivative along this path. This extends the mean value theorem to Banach spaces. This can be used for the eventual proof of the Newton-Kantorovich theorem with 1 constant contained inside the added reference. Here is the discussion on Zulipchat: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Contributing.20FTC-2.20for.20Banach.20spaces	new-contributor t-measure-probability t-analysis merge-conflict awaiting-author	60/1	Mathlib/MeasureTheory/Integral/FundThmCalculus.lean	1	3	['github-actions', 'hrmacbeth', 'victorliu5296']	nobody	180-65614 5 months ago	180-65614 5 months ago	51-85104 51 days
22701	ctchou author:ctchou	feat(Combinatorics): the Katona circle method	This file formalizes the Katona circle method. From PlainCombi (LeanCamCombi): https://github.com/YaelDillies/LeanCamCombi/blob/master/LeanCamCombi/PlainCombi/KatonaCircle.lean Co-authored-by: Yaël Dillies	new-contributor t-combinatorics merge-conflict	121/0	Mathlib.lean,Mathlib/Combinatorics/KatonaCircle.lean	2	1	['github-actions']	nobody	180-15169 5 months ago	180-15169 5 months ago	30-8337 30 days
21488	imbrem author:imbrem	feat(CategoryTheory/Monoidal): premonoidal categories	Add support for premonoidal categories --- Still want to add support for: - Premonoidal braided/symmetric categories - The monoidal coherence theorem, which I've already ported in my `discretion` library - The `coherence` tactic, which should work fine for premonoidal categories too but wanted to get this in front of reviewers ASAP to make sure my general approach was alright [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory merge-conflict	900/361	Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/CoherenceLemmas.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,MathlibTest/StringDiagram.lean	21	9	['YaelDillies', 'github-actions', 'grunweg', 'imbrem', 'kim-em', 'leanprover-community-bot-assistant']	nobody	177-47802 5 months ago	177-47803 5 months ago	58-20339 58 days
20873	vbeffara author:vbeffara	feat(Topology/Covering): path lifting and homotopy lifting	This proves the existence and uniqueness of path and homotopy lifts through covering maps. --- I tried to separate as much of the proof as possible into separate PRs (which are already in Mathlib now), but the proof here relies on a monolithic construction of an explicit lift along a well-chosen subdivision, in `partial_lift`, with associated definitions. Only one standalone lean file added. An older WIP PR #10084 by Junyan Xu @alreadydone proves similar results using a very similar construction for path lifting, with a different argument to obtain continuity for homotopy lifting. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology merge-conflict awaiting-author	281/1	Mathlib.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Lift.lean	3	9	['alreadydone', 'github-actions', 'grunweg', 'vbeffara']	nobody	176-50530 5 months ago	176-50530 5 months ago	55-53553 55 days
20313	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Data/Complex/Exponential): prove some useful results about the complex exponential.	This PR proves two basic results about the complex exponential: * `abs_exp_mul_I (x : ℂ) : abs (Complex.exp (I * x)) = Real.exp (-x.im)` * `one_sub_rexp_re_le_abs_one_sub_cexp (x : ℂ) : 1 - Real.exp x.re ≤ Complex.abs (1 - Complex.exp x)` Both results were proved as part of the sphere packing project. There's a chance they're too specific for mathlib, but I thought they were worth PRing anyway. Would it also be a good idea to tag `abs_exp_mul_I` with `simp`? Feedback/suggestions welcome. Note: `one_sub_rexp_re_le_abs_one_sub_cexp` was proved by Bhavik Mehta @b-mehta --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict	167/141	Mathlib.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/ERealExp.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev.lean,Mathlib/Data/Complex/Exponential/Defs.lean,Mathlib/Data/Complex/Exponential/Lemmas.lean,Mathlib/Data/Complex/ExponentialBounds.lean,Mathlib/Tactic/FunProp.lean,MathlibTest/Recall.lean,MathlibTest/positivity.lean	10	12	['b-mehta', 'github-actions', 'kim-em', 'thefundamentaltheor3m', 'trivial1711']	nobody	169-21728 5 months ago	169-21728 5 months ago	25-60481 25 days
20730	kuotsanhsu author:kuotsanhsu	feat(LinearAlgebra/Matrix/SchurTriangulation): prove Schur decomposition/triangulation	`Matrix.schur_triangulation` shows that a matrix over an algebraically closed field is unitarily similar to an upper triangular matrix --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict awaiting-author label:t-algebra$	317/2	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/LinearAlgebra/Matrix/SchurTriangulation.lean,Mathlib/Logic/Equiv/Basic.lean	4	14	['eric-wieser', 'github-actions', 'kim-em', 'kuotsanhsu']	nobody	169-17860 5 months ago	169-17860 5 months ago	13-60072 13 days
13685	niklasmohrin author:niklasmohrin	feat(Combinatorics): add definitions for network flows	Although we might not have any super-interesting results ready for mathlib yet, I feel that the definitions from this commit are already mature enough to include. These definitions are ported from last semester's work we did at https://github.com/niklasmohrin/lean-seminar-2023 and I have put some time in to refactor our code to `Int` and now to any parameter `R`. In the linked repository, there is some more stuff that I can send in. One obstacle without integer values is that it is not clear why a maximum flow would exist. I think the best way to tackle this would be to prove max-flow-min-cut theorem and implement the Ford-Fulkerson algorithm. It has been pointed out on Zulip that there is an [Isabelle formalization of the Edmonds Karp Algorithm](https://www.isa-afp.org/entries/EdmondsKarp_Maxflow.html). I feel that the definitions are pretty solid and it makes sense to include them, even if just for unifying definitions across downstream projects. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics merge-conflict awaiting-author	244/0	Mathlib.lean,Mathlib/Combinatorics/Flow/Basic.lean,docs/references.bib	3	57	['Shreyas4991', 'YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak', 'niklasmohrin']	nobody	142-7176 4 months ago	142-7178 4 months ago	86-21072 86 days
15651	TpmKranz author:TpmKranz	feat(Computability/NFA): operations for Thompson's construction	Lays the groundwork for a proof of equivalence of RE and NFA, w.r.t. described language. Actual connection to REs comes later, after the groundwork for the opposite direction has been laid. Third chunk of #12648 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	307/5	Mathlib/Computability/NFA.lean	1	15	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte']	nobody	137-37584 4 months ago	137-37585 4 months ago	45-84611 45 days
22361	rudynicolop author:rudynicolop	feat(Computability/NFA): nfa closure properties	Add the closure properties union, intersection and reversal for NFA. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	218/2	Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean	2	90	['EtienneC30', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	EtienneC30 assignee:EtienneC30	137-36658 4 months ago	137-36660 4 months ago	39-67601 39 days
23349	BGuillemet author:BGuillemet	feat: add LocallyLipschitzOn.lipschitzOnWith_of_isCompact and two small lemmas about Lipschitz functions	Main feat (in Mathlib/Topology/EMetricSpace/Basic.lean): if a function `f` from an extended pseudometric space to a pseudometric space is locally Lipschitz on a compact subset `s`, then `f` is Lipschitz on `s`. The theorem is true only when the codomain of `f` is a pseudometric space, so it needs imports from Mathlib/Topology/MetricSpace. Other small feat (in Mathlib/Analysis/Calculus/ContDiff/RCLike.lean): a function that is continuously differentiable on an open subset is locally Lipschitz on this subset. --- - [ ] depends on: #22890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-topology merge-conflict	59/4	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	PatrickMassot assignee:PatrickMassot	129-32898 4 months ago	129-32900 4 months ago	35-30364 35 days
12799	jstoobysmith author:jstoobysmith	feat(LinearAlgebra/UnitaryGroup): Add properties of Special Unitary Group	Add properties of the special unitary group, mirroring the properties of found in Algebra/Star/Unitary.lean. In particular, I add an instance of `specialUnitaryGroup` as a `Group`, `Star`, `InvolutiveStar`, and `StarMul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict please-adopt awaiting-author label:t-algebra$	78/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	8	['chrisflav', 'jcommelin', 'leanprover-community-bot-assistant']	nobody	119-4851 3 months ago	119-4853 3 months ago	9-22007 9 days
20334	miguelmarco author:miguelmarco	feat: allow polyrith to use a local Singular/Sage install	Try to call a local install of Singular (either standalone or inside Sage) to find the witness for polyrith before trying to call the online sage cell server. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta merge-conflict awaiting-author	171/48	Mathlib/Tactic/Polyrith.lean,scripts/polyrith_sage.py	2	16	['eric-wieser', 'github-actions', 'hanwenzhu', 'kim-em', 'miguelmarco', 'mkoeppe']	nobody	111-83804 3 months ago	231-61766 7 months ago	27-65384 27 days
19796	peakpoint author:peakpoint	feat: L'Hopital's rule from within a convex set	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict	190/19	Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Convex/Topology.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Order/Interval/Set/Basic.lean	5	15	['RemyDegenne', 'github-actions', 'leanprover-community-bot-assistant', 'peakpoint', 'sgouezel']	sgouezel assignee:sgouezel	90-81602 2 months ago	90-81602 2 months ago	80-57750 80 days
23637	kirilvino author:kirilvino	feat(Combinatorics/SimpleGraph): every circuit contains a cycle proof	circuit to cycle proof --- This PR uses the bypass definition in a new function for closed walks that removes repeated vertices. Then proves if the closed walk given is a circuit, that the result from this function is a cycle. This is then packaged up similar to the existing ToPath definition, creating a way of transforming a circuit into a cycle. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics merge-conflict awaiting-author	26/0	Mathlib/Combinatorics/SimpleGraph/Path.lean	1	9	['b-mehta', 'github-actions', 'kirilvino', 'leanprover-community-bot-assistant']	nobody	90-81213 2 months ago	90-81214 2 months ago	13-19789 13 days
25218	kckennylau author:kckennylau	feat(AlgebraicGeometry): Tate normal form of elliptic curves	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip new-contributor t-algebraic-geometry merge-conflict	291/26	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Modular/TateNormalForm.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	5	31	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'github-actions', 'grunweg', 'kckennylau', 'leanprover-community-bot-assistant']	nobody	90-80565 2 months ago	90-80566 2 months ago	6-51040 6 days
25283	Brian-Nugent author:Brian-Nugent	feat: regular local rings	Adds regular local rings and proves they are integral domains. --- - [ ] depends on: #25280 - [ ] depends on: #25282 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict label:t-algebra$	871/0	.vscode/settings.json,Mathlib.lean,Mathlib/RingTheory/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRingDimension.lean,Mathlib/RingTheory/RegularLocalRing.lean	5	6	['Brian-Nugent', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'yuanyi-350']	nobody	90-80561 2 months ago	90-80561 2 months ago	11-84822 11 days
23990	robertmaxton42 author:robertmaxton42	feat (Types.Colimits): Quot is functorial and colimitEquivQuot is natural	Add `Functor.quotFunctor` to parallel `Functor.sectionsFunctor`, witnessing that `Quot` is functorial; add `colimNatIsoQuotFunctor` to parallel `limNatIsoSectionsFunctor`, witnessing that `colimitEquivQuot` is natural in the diagram $F$. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory merge-conflict awaiting-author	33/0	Mathlib/CategoryTheory/Limits/Types/Colimits.lean	1	5	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'robertmaxton42']	nobody	87-1977 2 months ago	87-1978 2 months ago	8-28043 8 days
10541	Louddy author:Louddy	feat(Algebra/SkewMonoidAlgebra/Basic): add SkewMonoidAlgebra	# Skew Monoid algebras This file presents a skewed version of `Mathlib.Algebra.MonoidAlgebra.Basic`. ## Definition We define `SkewMonoidAlgebra k G := G →₀ k` attached with a skewed convolution product. Here, the product of two elements `f g : SkewMonoidAlgebra k G` is the finitely supported function whose value at `a` is the sum of `f x * (x • g y)` over all pairs `x, y` such that `x * y = a`. This will be used in a later PR to define skew polynomial rings. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [x] depends on: #15878 - [x] depends on: #19084 - [x] depends on: #22078 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict WIP label:t-algebra$	1624/0	Mathlib.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/SkewMonoidAlgebra/Lift.lean	4	105	['AntoineChambert-Loir', 'Louddy', 'YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions', 'mariainesdff', 'mathlib4-dependent-issues-bot', 'mattrobball']	AntoineChambert-Loir assignee:AntoineChambert-Loir	86-49643 2 months ago	86-49645 2 months ago	179-12934 179 days
20029	FrederickPu author:FrederickPu	Allow for Config attributes to be set directly	Allow for Config attributes to be set directly when using initialize_simp_projection as per issue #19895 Basically modified initialize_simp_projection so that the user has the option of specifying a tuple of config option values. Ex: ``` initialize_simp_projection MulEquiv (toFun → apply, invFun → symm_apply) (fullyApplied := false) ``` These config options are then converted into projections. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta merge-conflict WIP	34/4	Mathlib/Tactic/Simps/Basic.lean	1	11	['FrederickPu', 'YaelDillies', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant']	nobody	70-21590 2 months ago	70-21591 2 months ago	0-34081 9 hours
11021	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology) : add join of augmented SSets	This pull-request adds the definition of the join of augmented SSets defined as contravariant functors from `WithInitial SimplexCategory` to `Type u`. In addition it shows that the join of two standard augmented SSets is again an augmented SSets. From this the definition of the join of simplicial sets should follow easily. To aid the above theory, an api for `WithInitial SimplexCategory` has been created, with the notion of the `join` and `split` (forming a sort of inverse to join) of objects in this category are defined. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict WIP	2137/1	.gitignore,Mathlib.lean,Mathlib/AlgebraicTopology/Join.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SimplexCategoryWithInitial.lean,Mathlib/AlgebraicTopology/SimplicialSet.lean	6	47	['github-actions', 'jcommelin']	nobody	64-52749 2 months ago	64-52749 2 months ago	1-20125 1 day
10190	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): add Augmented Simplex Category	- Added the definition of the category FinLinOrd of finite linear ordered sets. - Added the definition of the augmented simplex category `AugmentedSimplexCategory`, and showed it is the Skeleton of FinLinOrd. - Showed that the category of augmented simplicial objects defined as a comma category is equivalent to the category of functors from `AugmentedSimplexCategory^\op` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor t-category-theory merge-conflict WIP	720/0	Mathlib.lean,Mathlib/AlgebraicTopology/AugmentedSimplexCategory.lean,Mathlib/AlgebraicTopology/SimplicialObject.lean,Mathlib/Order/Category/FinLinOrd.lean	4	5	['TwoFX', 'YaelDillies', 'joelriou', 'jstoobysmith']	nobody	64-52705 2 months ago	64-52705 2 months ago	7-63215 7 days
9935	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): add constructors for horns	Added a function that given a simplicial set S and a set of n-1 simplexes satisfying certain conditions, creates a morphism in SSet from a n horn to a simplicial set S. Included also are a series of lemmas and definitions used in this construction. In particular I define a function that takes a m-simplex in a horn, and returns the smallest 'index' of face it factors through, and give a series of lemmas related to this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict awaiting-author	462/2	Mathlib/AlgebraicTopology/SimplicialSet.lean	1	15	['YaelDillies', 'jcommelin', 'jstoobysmith', 'kim-em', 'linesthatinterlace']	nobody	64-52106 2 months ago	64-52106 2 months ago	14-58814 14 days
25485	VTrelat author:VTrelat	feat(SetTheory/ZFC/Naturals): define natural numbers in ZFC	Extend the model of ZFC with naturals: - define a set `Nat` of naturals following the usual construction (∅, {∅}, {∅, {∅}}, ...) - define a proper type `ZFNat` representing naturals - add theorems on usual algebraic properties of naturals - provide a recursor and induction schemes to define/prove by induction --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depend on: #25483	t-set-theory new-contributor merge-conflict	2095/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Naturals.lean	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	60-58926 1 month ago	60-58926 1 month ago	29-51653 29 days
25238	Hagb author:Hagb	feat(Tactic/ComputeDegree): add support for scalar multiplication with different types	It would be able to deal with `a • (X : R[X])` where `a : S` is in a different type `S` with `[SMulZeroClass S R]`. --- - [x] depends on: #25237 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta merge-conflict	17/5	Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	60-58896 1 month ago	60-58896 1 month ago	38-26044 38 days
18646	jxjwan author:jxjwan	feat(RingTheory): isotypic components	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor merge-conflict	308/0	Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/RingTheory/Isotypic.lean,Mathlib/RingTheory/SimpleModule.lean	3	1	['github-actions']	nobody	59-60917 1 month ago	59-60917 1 month ago	20-16585 20 days
27378	peakpoint author:peakpoint	refactor(Geometry/Euclidean/Projection): redefine projection and reflection for affine subspaces	This PR continues the work from #25578. Original PR: https://github.com/leanprover-community/mathlib4/pull/25578	new-contributor t-euclidean-geometry merge-conflict	316/317	Mathlib/Analysis/Normed/Affine/ContinuousAffineMap.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Geometry/Euclidean/Circumcenter.lean,Mathlib/Geometry/Euclidean/Projection.lean	4	7	['github-actions', 'jsm28', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'peakpoint']	nobody	56-35059 1 month ago	56-35060 1 month ago	15-31164 15 days
20671	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Analysis/Asymptotics/SpecificAsymptotics): Proving that 𝛔ₖ(n) = O(nᵏ⁺¹)	This PR proves a result about the $\sigma_k(n)$ arithmetic function, namely, that it is $O\left(n^{k+1}\right)$. Main theorem: `theorem sigma_asymptotic (k : ℕ) : (fun n ↦ (σ k n : ℝ)) =O[atTop] (fun n ↦ (n ^ (k + 1) : ℝ))` This result was proved as part of the sphere packing project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-number-theory merge-conflict awaiting-author	29/0	Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean	1	3	['b-mehta', 'github-actions', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	54-64458 1 month ago	54-64458 1 month ago	9-59130 9 days
25483	VTrelat author:VTrelat	chore(Data/Set/Prod, SetTheory/ZFC/Basic): add theorem prod_subset_of_prod and extend ZFC model	Required by @eric-wieser in #24281 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict	103/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean	2	10	['Ruben-VandeVelde', 'VTrelat', 'github-actions', 'leanprover-community-bot-assistant']	nobody	51-46248 1 month ago	90-80555 2 months ago	29-56208 29 days
27953	CoolRmal author:CoolRmal	feat(ProbabilityTheory): Conditional Jensen's Inequality	This PR adds conditional Jensen's inequality. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict	526/14	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Separation.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondJensen.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean	5	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	50-20644 1 month ago	50-20645 1 month ago	8-36460 8 days
8102	miguelmarco author:miguelmarco	feat(Tactic): add `unify_denoms` and `collect_signs` tactics	This PR adds four new tactics: - `unify_denoms` tries to put expressions with several divisions in a form with only one division. In the case of fields, it works similarly to `field_simp`, but if the hypothesis about denominators being nonzero are not present, it assumes them, and leaves them as new goals to prove. In that sense, it is an "unsafe" tactic (but can be useful nevertheless, for example when you can't find which exact hypothesis is missing). It also works with expressions of naturals and Euclidean domains, assuming the corresponding hypothesis about the denominators dividing the numerators. - `unify_denoms!` extends `unify_denoms` to work with (in)equalities, assuming also that the denominators, once in normal form, are positive. - `collect_signs` works similarly with expressions using sums and substractions: it tries to put them in a form of one sum minus other sum. In the case of working with naturals, it assumes that we never substract a bigger number from a smaller one. Both are implemented essentially as a macro that combines several rewriting rules. Some new lemmas with the corresponding rules are added. ---	new-contributor t-meta merge-conflict please-adopt modifies-tactic-syntax good first issue	407/0	Mathlib.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CollectSigns.lean,Mathlib/Tactic/UnifyDenoms.lean,MathlibTest/unify_denoms.lean,scripts/noshake.json	7	55	['Paul-Lez', 'YaelDillies', 'github-actions', 'joneugster', 'kbuzzard', 'mathlib4-merge-conflict-bot', 'miguelmarco']	nobody	49-61716 1 month ago	49-71472 1 month ago	22-16933 22 days
28150	Equilibris author:Equilibris	chore: clean up proofs typevec proofs	While adding variable universe corecs I found a lot of theorems in typevec that could do with a bit of a clean-up --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict	24/26	Mathlib/Data/TypeVec.lean	1	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	42-11323 1 month ago	42-11324 1 month ago	13-49738 13 days
27403	MoritzBeroRoos author:MoritzBeroRoos	fix: replace probably erroneous usage of ⬝ (with old \cdot) by · (with \centerdot)	Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations \cdot and \centerdot resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for center..). This pr replaces instances of ⬝ where · was probably meant. All of the replacement is in comments, except for the file bench_summary.lean which is used for priting the github benchmark results. Since this file is about scientific notation of numbers, sure · was meant to be used, not a rectangle. [Related](https://github.com/leanprover-community/mathlib4/pull/27399) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict	195/195	Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/DirectSum/Idempotents.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/Normed/Unbundled/InvariantExtension.lean,Mathlib/Analysis/SpecialFunctions/Complex/CircleAddChar.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/FieldTheory/PurelyInseparable/PerfectClosure.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/NumberTheory/SiegelsLemma.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Instances/Matrix.lean,scripts/bench_summary.lean	49	5	['eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	41-77043 1 month ago	64-52965 2 months ago	7-54661 7 days
27399	MoritzBeroRoos author:MoritzBeroRoos	chore: replace every usage of ⬝ᵥ (with old \cdot) by ·ᵥ (with \centerdot)	Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations `\cdot` and `\centerdot` resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for `center`..): - `\cdot` gives ⬝ [U+2B1D](https://www.compart.com/en/unicode/U+2B1D) "Black Very Small Square" - `\centerdot` gives · [U+00B7](https://www.compart.com/en/unicode/U+00B7) "Middle Dot" Mathlib mostly uses the `\centerdot` variant, except for the dotProduct notation and some probably unsuspecting people wanting \centerdot but getting \cdot in their comments and 6 uses of a notation using the raw `\cdot` without any subscript at `Mathlib\Topology\Homotopy\Product.lean`. This PR replaces the dot product `⬝ᵥ` with its `\centerdot` counterpart `·ᵥ`. The related PR [here](https://github.com/leanprover/vscode-lean4/pull/639) can then overwrite the `\cdot` abbreviation, to produce the same symbol as the `centerdot` abbreviation does. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict	133/133	Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/Topology/Instances/Matrix.lean	25	6	['MoritzBeroRoos', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	41-38875 1 month ago	64-52966 2 months ago	7-62439 7 days
28708	sjh227 author:sjh227	feat (Data) : edit DoublyStochastic, add Stochastic to matrix	edit DoublyStochastic add Stochastic --- Add the file Stochastic to matrix. Edit DoublyStochastic so that it depends on Stochastic along with a new lemma	t-data new-contributor merge-conflict	249/1	Mathlib.lean,Mathlib/Data/Matrix/DoublyStochastic.lean,Mathlib/Data/Matrix/Stochastic.lean	3	26	['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'sjh227']	nobody	37-29587 1 month ago	37-29587 1 month ago	0-78027 21 hours
28623	gilesgshaw author:gilesgshaw	feat(Logic/Basic): minor additions and simplification of proofs	Add new theorems and simplify proofs. Specifically, we add the family of related theorems `apply_dite_iff_exists`, `apply_dite_iff_forall`, `apply_ite_iff_and` and `apply_ite_iff_or`. For each other 'family' of theorems in the file that is analogous to the above, we do the following - Simplify proofs where possible, e.g. by appealing to the new theorems - Complete the family, if any of the corresponding four are missing - Rename to ensure consistency with the above pattern ---	new-contributor t-logic merge-conflict	83/55	Archive/Examples/IfNormalization/Result.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Notation/Indicator.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/Logic/Basic.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean,Mathlib/SetTheory/Ordinal/Notation.lean	9	12	['eric-wieser', 'gilesgshaw', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	awainverse assignee:awainverse	24-44906 24 days ago	24-44907 24 days ago	21-3001 21 days
29574	JarodUW author:JarodUW	Regular local rings are domains	We have added three new files in Mathlib/RingTheory/LocalRing * EmbeddingDimension.lean * LocalRingDimension.lean * RegularLocalRings.lean We have added two lemmas and an instance in Mathlib/RingTheory/LocalRing/RingHom/Basic.lean This work was done by Jarod Alper and Brian Nugent. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor merge-conflict	910/3	Mathlib.lean,Mathlib/RingTheory/LocalRing/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRing/LocalRingDimension.lean,Mathlib/RingTheory/LocalRing/RegularLocalRings.lean,Mathlib/RingTheory/LocalRing/RingHom/Basic.lean,lake-manifest.json	6	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	18-83255 18 days ago	18-83256 18 days ago	3-7974 3 days
14242	js2357 author:js2357	feat: Prove equivalence of `isDedekindDomain` and `isDedekindDomainDvr`	Prove that `isDedekindDomainDvr` is equivalent to both `isDedekindDomain` and `isDedekindDomainInv`. Specifically, prove `isDedekindDomainDvr A → isDedekindDomainInv A`, because `isDedekindDomain A → isDedekindDomainDvr A` and `IsDedekindDomain A ↔ IsDedekindDomainInv A` are already in Mathlib. - [x] depends on: #14099 - [x] depends on: #14216 - [ ] depends on: #14237 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	269/1	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Dvr.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean	4	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	374-29474 1 year ago	374-29474 1 year ago	0-0 0 seconds
16888	metinersin author:metinersin	feat(ModelTheory/Complexity): Define conjunctive and disjunctive normal forms	Define `FirstOrder.Language.BoundedFormula.IsDNF` and `FirstOrder.Language.BoundedFormula.IsCNF`. --- - [ ] depends on: #16887 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict blocked-by-other-PR	415/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	366-25452 1 year ago	366-25452 1 year ago	0-1045 17 minutes
16887	metinersin author:metinersin	feat(ModelTheory/Complexity): define conjunctive and disjunctive formulas	Defines `FirstOrder.Language.BoundedFormula.IsConjunctive` and `FirstOrder.Language.BoundedFormula.IsDisjunctive`. --- - [ ] depends on: #16885 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict blocked-by-other-PR	300/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	366-25452 1 year ago	366-25453 1 year ago	0-1299 21 minutes
16889	metinersin author:metinersin	feat(ModelTheory/Complexity): Normal forms	Defines `FirstOrder.Language.BoundedFormula.toDNF` and `FirstOrder.Language.BoundedFormula.toCNF` - given a quantifier-free formula, these construct a semantically equivalent formula in disjunctive normal form and conjunctive normal form, respectively. --- - [ ] depends on: #16888 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict blocked-by-other-PR	525/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	366-25451 1 year ago	366-25451 1 year ago	0-613 10 minutes
12750	Command-Master author:Command-Master	feat: define Gray code	--- Define binary reflected gray code, both as a permutation of `Nat` and as a permutation of `BitVec n`, and prove some theorems about them. Additionally, remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. - [ ] depends on: #12751 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict awaiting-author blocked-by-other-PR	226/0	Mathlib.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/GrayCode.lean,Mathlib/Data/Nat/Size.lean	5	5	['Rida-Hamadani', 'alreadydone', 'github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	348-48109 11 months ago	348-48109 11 months ago	6-8380 6 days
11156	smorel394 author:smorel394	feat(LinearAlgebra/{TensorProductBasis,Dual}): basis and dual of `PiTensorProduct`	Construct a basis of a `PiTensorProduct` of modules given bases of the modules, and relationship between the dual of a `PiTensorProduct` and the `PiTensorProduct` of the duals. Main results: * `Basis.piTensorProduct` (in `LinearAlgebra/TensorProductBasis.lean`): Let `ι` be a `Fintype` and `M` be a family of modules indexed by `ι`. If `b i : κ i → M i` is a basis for every `i` in `ι`, then `fun (p : Π i, κ i) ↦ ⨂ₜ[R] i, b i (p i)` is a basis of `⨂[R] i, M i`. * `PiTensorProduct.dualDistrib` (in `LinearAlgebra/Dual.lean`): The canonical linear map from `⨂[R] i, Dual R (M i)` to `Dual R (⨂[R] i, M i)`, sending `⨂ₜ[R] i, f i` to the composition of `PiTensorProduct.map f` with the linear equivalence `⨂[R] i, R →ₗ R` given by multiplication. * `PiTensorProduct.dualDistribEquiv` (also in `LinearAlgebra/Dual.lean`): A linear equivalence between `⨂[R] i, Dual R (M i)` and `Dual R (⨂[R] i, M i)` when all `M i` are finite free modules. If `f : (i : ι) → Dual R (M i)`, then this equivalence sends `⨂ₜ[R] i, f i` to the composition of `PiTensorProduct.map f` with the natural isomorphism `⨂[R] i, R ≃ R` given by multiplication. - [ ] depends on: #11155 (currently used as the base branch; do not merge without switching it back to `master`!) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra merge-conflict please-adopt blocked-by-other-PR label:t-algebra$	166/2	Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/LinearAlgebra/TensorProduct/Basis.lean	3	4	['eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	277-46186 9 months ago	322-61814 10 months ago	0-0 0 seconds
15720	znssong author:znssong	feat(SimpleGraph): The Bondy-Chvátal theorem	The proof of the Bondy-Chvátal theorem, with Dirac's theorem and Ore's theorem as its corollary. - [x] depends on: #15536 - [ ] depends on: #15711 - [ ] depends on: #15578	new-contributor t-combinatorics merge-conflict blocked-by-other-PR	903/3	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/BondyChvatal.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Increasing.lean	8	3	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	YaelDillies assignee:YaelDillies	260-48453 8 months ago	260-48453 8 months ago	0-1791 29 minutes
20248	peabrainiac author:peabrainiac	feat(Topology/Compactness): first-countable locally path-connected spaces are delta-generated	Shows that all first-countable locally path-connected spaces are delta-generated (so in particular all normed spaces and convex subsets thereof are), and that delta-generated spaces are equivalently generated by the unit interval or standard simplices. --- - [ ] depends on: #21616 In principle, this should be close to all that's required to show that all simplicial complexes and CW-complexes are delta-generated; I just haven't done it yet because I'm not sure which file to best do it in. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-topology merge-conflict awaiting-author blocked-by-other-PR	1189/813	Mathlib.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/Compactness/DeltaGeneratedSpace.lean,Mathlib/Topology/Connected/LocPathConnected.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/Homotopy/HSpaces.lean,Mathlib/Topology/Path.lean	9	22	['YaelDillies', 'github-actions', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'peabrainiac']	nobody	236-10689 7 months ago	236-10689 7 months ago	39-21495 39 days
14060	YnirPaz author:YnirPaz	feat(SetTheory/Ordinal/Clubs): define club sets and prove basic properties	Create a file where club sets are defined and their basic properties are proven. I also created a new recursion principle for ordinals, bounded recursion. --- - [ ] depends on: #19189 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict blocked-by-other-PR	315/3	Mathlib.lean,Mathlib/Order/SuccPred/Limit.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Club.lean,Mathlib/SetTheory/Ordinal/Topology.lean	6	93	['YaelDillies', 'YnirPaz', 'alreadydone', 'dupuisf', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp', 'zeramorphic']	nobody	213-82210 6 months ago	213-82210 6 months ago	92-44198 92 days
15654	TpmKranz author:TpmKranz	feat(Computability): language-preserving maps between NFA and RE	Map REs to NFAs via Thompson's construction and NFAs to REs using GNFAs Last chunk of #12648 --- - [ ] depends on: #15651 - [ ] depends on: #15649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict blocked-by-other-PR	985/2	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Data/FinEnum/Option.lean,docs/references.bib	7	3	['github-actions', 'leanprover-community-mathlib4-bot', 'meithecatte']	nobody	151-14978 4 months ago	151-14983 4 months ago	0-179 2 minutes
26168	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure) : variation defined as a supremum is equal to variation defined using the Hahn-Jordan decomposition.	Add `signedMeasure_totalVariation_eq`: if `μ` is a `SignedMeasure` then variation defined as a supremum is equal to variation defined using the Hahn-Jordan decomposition. Co-authored-by: @yoh-tanimoto - [ ] depends on: #26165 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability blocked-by-other-PR	680/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Equiv.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	90-62175 2 months ago	90-62704 2 months ago	15-65390 15 days
26165	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure): add lemma which shows that variation of a `ℝ≥0∞` VectorMeasure is equal to itself	Add a lemma for the variation of a VectorMeasure which tells that if `μ` is `VectorMeasure X ℝ≥0∞` then `variation μ = μ`. Co-authored-by: @yoh-tanimoto - [ ] depends on: #26160 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability blocked-by-other-PR	467/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	3	1	['github-actions']	nobody	90-62175 2 months ago	90-62731 2 months ago	15-66224 15 days
26160	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure): add several lemmas which characterize variation	Add the following lemmas concerning variation of a VectorMeasure: * `norm_measure_le_variation`: `‖μ E‖ₑ ≤ variation μ E`. * `variation_neg`: `(-μ).variation = μ.variation`. * `variation_zero`: `(0 : VectorMeasure X V).variation = 0`. * `absolutelyContinuous` Co-authored-by: @yoh-tanimoto - [ ] depends on: #26156 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability blocked-by-other-PR	432/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	90-62174 2 months ago	90-62783 2 months ago	15-68781 15 days
10006	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): homotopy in quasicategories	Defined a homotopy between two 1-simplicies in a quasicategories, and proved the property of being homotopic forms an equivalence relation. --- - [ ] depends on: #9935 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict awaiting-author blocked-by-other-PR	898/1	Mathlib.lean,Mathlib/AlgebraicTopology/Homotopy.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SimplicialSet.lean	4	3	['joelriou', 'leanprover-community-mathlib4-bot']	nobody	64-52366 2 months ago	64-52366 2 months ago	0-0 0 seconds
25486	VTrelat author:VTrelat	feat(SetTheory/ZFC/Integers): define integers in ZFC	Extend the model of ZFC with integers following the converse direction as for naturals. We first define a type and then build a set. We finally show that both representations have coercions in both direction: - define a proper type `ZFInt` representing integers based on `ZFNat × ZFNat` and following the usual construction of integers - add theorems on usual algebraic properties of integers - define a set `Int` and show that it matches-i.e. that it is isomorphic to-the type `ZFInt` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483 - [ ] depends on: #25485	t-set-theory new-contributor merge-conflict blocked-by-other-PR	2003/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Integers.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	60-58930 1 month ago	60-58930 1 month ago	0-2067 34 minutes
25484	VTrelat author:VTrelat	feat(SetTheory/ZFC/Booleans): define Boolean algebra in ZFC	Extend the model of ZFC with Boolean algebra: - define a set 𝔹 of booleans - define a proper type `ZFBool` representing booleans - add theorems on usual algebraic properties of booleans - provide usual boolean notations like `⊤`, `⊥`, `∧`, `∨`, etc. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483	t-set-theory new-contributor merge-conflict blocked-by-other-PR	619/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	60-58921 1 month ago	60-58921 1 month ago	0-1523 25 minutes
28152	Sebi-Kumar author:Sebi-Kumar	feat(AlgebraicTopology): characterize simply connectedness in terms of loops	Show that a space is simply connected if and only if all loops within that space are homotopic to the constant loop. To be used in a proof that the `n`-sphere is simply connected for `n > 1`. --- This code was written at the University of Western Ontario as a part of the Fields Undergraduate Summer Research Program under the supervision of Chris Kapulkin and Daniel Carranza. - [ ] depends on: #28126 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor blocked-by-other-PR	37/5	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	55-39067 1 month ago	55-39068 1 month ago	0-2854 47 minutes
28208	Sebi-Kumar author:Sebi-Kumar	feat(Topology): add the definition `foldTrans` to concatenate finite sequences of paths	Add `foldTrans`, which folds the function `Path.trans` across a sequence of paths with compatible endpoints, corresponding to the concatenation of a finite sequence of paths. This is implemented with `Fin.dfoldl` from the Batteries library. Prove basic properties about `foldTrans` (i.e., how it behaves with respect to `Path.refl`, `Path.subpath`, and homotopies). --- 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 prove that the `n`-sphere is simply connected for `n > 1`, following the proof from Hatcher's "Algebraic Topology." - [ ] depends on: #27261 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology blocked-by-other-PR	259/0	Mathlib.lean,Mathlib/Topology/FoldTrans.lean,Mathlib/Topology/Subpath.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	54-8707 1 month ago	54-8708 1 month ago	0-2340 39 minutes
27645	bjornsolheim author:bjornsolheim	feat(Geometry/Convex/Cone): add pointed cone tensor products	Define the minimal and maximal tensor product of pointed cones. Prove that the minimal tensor product is less than or equal to the maximal tensor product. --- - [ ] depends on: #25292 - [ ] depends on: #27578 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry new-contributor blocked-by-other-PR	316/0	Mathlib.lean,Mathlib/Geometry/Convex/Cone/ConicalHull.lean,Mathlib/Geometry/Convex/Cone/TensorProduct.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	52-23250 1 month ago	52-26899 1 month ago	0-1828 30 minutes
28530	nonisomorphiclinearmap author:nonisomorphiclinearmap	feat(Combinatorics/SimplicialComplex/Topology): add standard simplices and geometric realisation (colimit + functoriality)	Introduce the standard simplex on a finite vertex set and build the geometric realisation \|X\| of a simplicial complex. Prove that \|X\| is the colimit of the face diagram δ_X : X.faces ⥤ TopCat, and define the induced map on realisations \|φ\| : \|X\| ⟶ \|Y\| for a simplicial map φ. Show that the abstract map from colimit functoriality agrees with the concrete push-forward of barycentric coordinates. Package these into a functor SimplicialComplexCat ⥤ TopCat. --- 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 lays the groundwork to do this. 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. I would also like to thank our group members Sebastian Kumar, Tom Lindquist and Quang Minh Nguyen for our fruitful discussions. - [ ] depends on: #28125	new-contributor t-combinatorics blocked-by-other-PR	1826/0	Mathlib.lean,Mathlib/Combinatorics/SimplicialComplex/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Category.lean,Mathlib/Combinatorics/SimplicialComplex/FacePoset.lean,Mathlib/Combinatorics/SimplicialComplex/Hom.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Colimit.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Diagram.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Functor.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Map.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/Simplex.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/SimplexMap.lean	12	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	48-14511 1 month ago	48-21088 1 month ago	0-591 9 minutes
28502	gilesgshaw author:gilesgshaw	feat(Logic/Basic): avoid unnecessary uses of choice	Certain proofs are modified to remove a dependence on the axoim of choice --- - [ ] depends on: #28623	new-contributor t-logic merge-conflict awaiting-author blocked-by-other-PR	83/74	Mathlib/Logic/Basic.lean	1	7	['Ruben-VandeVelde', 'eric-wieser', 'gilesgshaw', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	45-75954 1 month ago	45-75955 1 month ago	0-35689 9 hours
19582	yu-yama author:yu-yama	feat(GroupExtension/Abelian): define `OfMulDistribMulAction.equivH2`	Mainly defines: - `structure GroupExtension.OfMulDistribMulAction N G [MulDistribMulAction G N]`: group extensions of `G` by `N` where the multiplicative action of `G` on `N` is the conjugation - `structure GroupExtension.OfMulDistribMulActionWithSection N G [MulDistribMulAction G N]`: group extensions with specific choices of sections - `def GroupExtension.OfMulDistribMulAction.equivH2`: a bijection between the equivalence classes of group extensions and $H^2 (G, N)$ --- - [x] depends on: #20802 (split PR: contains changes to the `Defs` file) - [x] depends on: #20998 (split PR: mainly adds the `Basic` file) - [ ] depends on: #26670 (split PR: adds the first part of the `Abelian` file) Here is a relevant TODO in Mathlib: https://github.com/leanprover-community/mathlib4/blob/4e9fa40d7c480937e09cd6e47a591bd6f3b8be42/Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean#L46-L48 I would appreciate your comments. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	750/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Abelian.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,docs/references.bib	4	5	['YaelDillies', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	43-26062 1 month ago	43-26063 1 month ago	43-26015 43 days
28246	Sebi-Kumar author:Sebi-Kumar	feat(AlgebraicTopology/FundamentalGroupoid): the n-sphere is simply connected for n > 1	Prove that the `n`-dimensional sphere (i.e., the unit sphere centered at the origin in `(n + 1)`-dimensional real Euclidean space) is a simply connected space for `n > 1`. This proof follows Hatcher's "Algebraic Topology"; we first prove a general lemma about decomposing loops and then exploit the fact that non-surjective loops in the sphere are homotopically trivial. Note: To get this file to build, I edited `Mathlib/Tactic/Linter/DirectoryDependency.lean` to remove the restrictions on AlgebraicTopology files importing Geometry, NumberTheory, and SetTheory files. Thank you to those who shared their expertise [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Warning.20that.20AlgebraicTopology.20can't.20import.20SetTheory/with/533833638). As I understand it, this is just a short-term solution, so I would appreciate feedback on what to do about this situation. Note: I am unsure where exactly the file `SimplyConnectedSphere.lean` should go or whether that is an appropriate name for the file, so feedback there would be appreciated. --- To provide additional context, this code was written 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. - [ ] depends on: #28208 - [ ] depends on: #28198 - [ ] depends on: #28185 - [ ] depends on: #28152 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor blocked-by-other-PR	639/6	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnectedSphere.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Topology/FoldTrans.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/Subpath.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	42-24670 1 month ago	53-21868 1 month ago	0-23 23 seconds
25488	VTrelat author:VTrelat	feat(SetTheory/ZFC/Rationals): define rationals in ZFC	Extend the model of ZFC with rationals: we define a proper type `ZFRat` representing integers based on pairs of `ZFInt` (enforcing the res to be nonzero) and following the usual construction of rationals. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483 - [ ] depends on: #25485 - [ ] depends on: #25486	t-set-theory new-contributor merge-conflict blocked-by-other-PR	2070/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Integers.lean,Mathlib/SetTheory/ZFC/Rationals.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	41-77080 1 month ago	41-77080 1 month ago	0-1808 30 minutes
27578	bjornsolheim author:bjornsolheim	feat(Geometry/Convex/Cone): add conical combinations and conical hull	- Prove closure properties of sequences with nonnegative coefficients - Define conical hull - Prove that the smallest pointed cone containing s is the conical hull of s - Implemented with Finsupp --- - [ ] depends on: #25292 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry new-contributor blocked-by-other-PR	188/0	Mathlib.lean,Mathlib/Geometry/Convex/Cone/ConicalHull.lean	2	8	['YaelDillies', 'bjornsolheim', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	38-36235 1 month ago	52-31935 1 month ago	0-254 4 minutes
26413	michaellee94 author:michaellee94	feat(Analysis/ODE/MaximalSolution): Existence of maximal solutions for ODE meeting Picard-Lindelöf conditions	Add existence proof for maximal solution of ODE using Picard-Lindelöf and a uniqueness theorem using Grönwall's lemma. --- - [x] depends on: #26382 - [ ] depends on: #29186 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict awaiting-author blocked-by-other-PR	746/1	Mathlib.lean,Mathlib/Analysis/ODE/MaximalSolution.lean,docs/undergrad.yaml	3	13	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'winstonyin']	nobody	33-22465 1 month ago	33-22466 1 month ago	0-5139 1 hour
28126	Sebi-Kumar author:Sebi-Kumar	feat(AlgebraicTopology/FundamentalGroupoid): relate equality in fundamental groupoid to homotopy	Prove the theorem `fromPath_eq_iff_homotopic` which shows that two paths are equal in the fundamental groupoid if and only if they are homotopic. Also add simp lemmas `fromPath_refl`, `fromPath_symm`, and `fromPath_trans`. Together, these allow one to prove two paths are homotopic by transferring to the fundamental groupoid and using the `aesop_cat` tactic. --- I would like to thank Kenny Lau for inspiring this code on Zulip at [#Is there code for X? > Using aesop_cat to prove paths are homotopic](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Using.20aesop_cat.20to.20prove.20paths.20are.20homotopic). Also, I would like to note that I am a newcomer when it comes to contributing to Mathlib, and that this code was written as a part of a formalization project at the University of Western Ontario under the supervision of Chris Kapulkin and Daniel Carranza (which is happening through the Fields Undergraduate Summer Research Program). - [ ] depends on: #28234 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor awaiting-author blocked-by-other-PR	121/141	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Product.lean	8	10	['Sebi-Kumar', 'alreadydone', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mattrobball']	mattrobball assignee:mattrobball	31-27213 1 month ago	31-27213 1 month ago	14-30316 14 days
29282	Jlh18 author:Jlh18	feat(CategoryTheory): HasColimits instance onGrpd	Show that the category of groupoids has all small colimits, as a coreflective subcategory of `Cat`, which has all small colimits. The right adjoint of the forgetful functor is the core functor `CategoryTheory.Core.functor`. - [ ] depends on: #29283 [Core of a category as a functor] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict blocked-by-other-PR	140/4	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Colimit.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Core.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-55828 16 days ago	16-55829 16 days ago	0-396 6 minutes
29283	Jlh18 author:Jlh18	feat(CategoryTheory): define forgetful-core adjunction between Cat and Grpd	* Define `CategoryTheory.Core.functor`: the functor `Cat ⥤ Grpd` that on objects takes the core of a category * Define `CategoryTheory.Core.adjunction`: the adjunction with the forgetful functor `Grpd.forgetToCat` on the left, and the core functor `Core.functor` on the right. * Hence provide an instance that `Grpd.forgetToCat` is coreflective. - [ ] depends on: #29284 [Extra lemmas in CategoryTheory.Core] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict blocked-by-other-PR	104/4	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Core.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-55827 16 days ago	16-55827 16 days ago	0-3572 59 minutes
27821	BGuillemet author:BGuillemet	feat(CategoryTheory/Sites/Sheaf): functorial version of Sheaf.homEquiv	Add two functorial versions of Sheaf.homEquiv, one using `yoneda` and the other using `coyoneda`. --- - [ ] depends on: #27819 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory blocked-by-other-PR	174/19	Mathlib/CategoryTheory/Sites/Sheaf.lean,Mathlib/CategoryTheory/Yoneda.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	14-40591 14 days ago	14-40618 14 days ago	0-2066 34 minutes
29812	Jlh18 author:Jlh18	refactor: weaken HasPullbacks to HasPullback in MorphismProperty.Limits	The `HasPullbacks` instance on a category `C` for defining the `baseChange` / pullback functor along a map `f : X -> Y` between their over categories can be weakened to just a `HasPullback` condition on `f`. - [ ] depends on: #29795 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory blocked-by-other-PR	31/22	Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean,Mathlib/CategoryTheory/MorphismProperty/Limits.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	14-33244 14 days ago	14-41744 14 days ago	0-1983 33 minutes
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: #xyz [optional extra text] --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor awaiting-author blocked-by-other-PR	70/3	Mathlib/Analysis/NormedSpace/HahnBanach/Separation.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/Topology/Order/OrderClosed.lean	3	14	['faenuccio', 'fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'mcdoll', 'themathqueen', 'yuanyi-350']	faenuccio assignee:faenuccio	8-69305 8 days ago	8-69307 8 days ago	21-29486 21 days

PRs not into the master branch

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
13158	erdOne author:erdOne	refactor(RingTheory/OreLocalization/Module): remove `LocalizedModule.mk`.	--- - [x] depends on: #13151 - [ ] depends on: #13156 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	49/48	Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Module.lean	2	1	['leanprover-community-mathlib4-bot']	nobody	451-46960 1 year ago	451-46983 1 year ago	0-0 0 seconds
11156	smorel394 author:smorel394	feat(LinearAlgebra/{TensorProductBasis,Dual}): basis and dual of `PiTensorProduct`	Construct a basis of a `PiTensorProduct` of modules given bases of the modules, and relationship between the dual of a `PiTensorProduct` and the `PiTensorProduct` of the duals. Main results: * `Basis.piTensorProduct` (in `LinearAlgebra/TensorProductBasis.lean`): Let `ι` be a `Fintype` and `M` be a family of modules indexed by `ι`. If `b i : κ i → M i` is a basis for every `i` in `ι`, then `fun (p : Π i, κ i) ↦ ⨂ₜ[R] i, b i (p i)` is a basis of `⨂[R] i, M i`. * `PiTensorProduct.dualDistrib` (in `LinearAlgebra/Dual.lean`): The canonical linear map from `⨂[R] i, Dual R (M i)` to `Dual R (⨂[R] i, M i)`, sending `⨂ₜ[R] i, f i` to the composition of `PiTensorProduct.map f` with the linear equivalence `⨂[R] i, R →ₗ R` given by multiplication. * `PiTensorProduct.dualDistribEquiv` (also in `LinearAlgebra/Dual.lean`): A linear equivalence between `⨂[R] i, Dual R (M i)` and `Dual R (⨂[R] i, M i)` when all `M i` are finite free modules. If `f : (i : ι) → Dual R (M i)`, then this equivalence sends `⨂ₜ[R] i, f i` to the composition of `PiTensorProduct.map f` with the natural isomorphism `⨂[R] i, R ≃ R` given by multiplication. - [ ] depends on: #11155 (currently used as the base branch; do not merge without switching it back to `master`!) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra merge-conflict please-adopt blocked-by-other-PR label:t-algebra$	166/2	Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/LinearAlgebra/TensorProduct/Basis.lean	3	4	['eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	277-46186 9 months ago	322-61814 10 months ago	0-0 0 seconds

PRs with an 'approved' review

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Approval(s)	Updated	Last status change	total time in review
9352	chenyili0818 author:chenyili0818	feat: arithmetic lemmas for `gradient`	This file is based on Mathlib.Analysis.Calculus.Gradient.Basic, and describes the calculation properties Co-authored-by: Ziyu Wang [tropicalfish910@gmail.com](mailto:tropicalfish910@gmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	404/0	Mathlib.lean,Mathlib/Analysis/Calculus/Gradient/Lemmas.lean	2	30	['chenyili0818', 'github-actions', 'jcommelin', 'sgouezel', 'winstonyin']	nobody	1	429-66280 1 year ago	591-47445 1 year ago	51-80670 51 days
11890	adomani author:adomani	feat: the terminal refine linter	A linter that warns on usages of `refine` and `refine'` as a finishing tactic. See this [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Usage.20of.20refine'). ### Conclusion of the experiment Systematic replacements of terminal `refine` with `exact` leads to an overall slow-down. --- - [ ] depends on: #15616 (disable the linter in downstream projects) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter awaiting-author	77/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TerminalRefineLinter.lean	3	14	['adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	1	410-66764 1 year ago	410-66766 1 year ago	18-13508 18 days
18461	hannahfechtner author:hannahfechtner	feat: left and right common multiples mixins	add mixins for left and right common multiples. These carry the data of what factors are used to create the common multiples --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	78/0	Mathlib/Algebra/Group/Defs.lean	1	13	['github-actions', 'hannahfechtner', 'jcommelin', 'kbuzzard', 'kim-em', 'trivial1711']	nobody	1	256-61952 8 months ago	256-61952 8 months ago	69-35596 69 days
22159	shetzl author:shetzl	feat: add definition of pushdown automata	Add the definition of pushdown automata and their two acceptance conditions: acceptance based on empty stack and acceptance based on final state. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	70/0	Mathlib.lean,Mathlib/Computability/PDA.lean	2	34	['YaelDillies', 'github-actions', 'madvorak', 'shetzl']	nobody	1	200-62302 6 months ago	200-62302 6 months ago	20-81771 20 days
18210	vihdzp author:vihdzp	feat(Order/Hom/Basic): `WithBot (Fin n) ≃o Fin (n + 1)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	16/0	Mathlib/Order/Hom/Basic.lean	1	8	['Command-Master', 'Ruben-VandeVelde', 'github-actions', 'urkud', 'vihdzp']	nobody	2	162-6177 5 months ago	333-10255 10 months ago	10-77913 10 days
21276	GabinKolly author:GabinKolly	feat(ModelTheory/Substructures): define equivalences between equal substructures	Define first-order equivalences between equal substructures, and prove related properties. --- This is some preparatory work for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic awaiting-author	62/0	Mathlib/ModelTheory/Substructures.lean	1	19	['GabinKolly', 'YaelDillies', 'fpvandoorn', 'github-actions', 'grunweg']	nobody	1	147-35013 4 months ago	147-35013 4 months ago	46-55730 46 days
21624	sinhp author:sinhp	feat(CategoryTheory): The (closed) monoidal structure on the product category of families of (closed) monoidal categories	Given a family of closed monoidal categories, we show that the product of these categories is a closed monoidal category with the pointwise monoidal structure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	144/0	Mathlib.lean,Mathlib/CategoryTheory/Pi/Basic.lean,Mathlib/CategoryTheory/Pi/Monoidal.lean,Mathlib/CategoryTheory/Pi/MonoidalClosed.lean	4	19	['TwoFX', 'YaelDillies', 'b-mehta', 'github-actions', 'jcommelin', 'sinhp']	nobody	1	136-68930 4 months ago	136-68930 4 months ago	54-54882 54 days
22919	plp127 author:plp127	feat(Data/Fintype/Pi): Make `Fintype` instance for `RelHom`s computable	Makes the `Fintype` instance for rel homs computable. See this [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Classical.20vs.20constructive.20logic.20in.20computation/near/496220816) message. --- - [x] depends on: #24748 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	178/44	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Data/Fintype/CardEmbedding.lean,Mathlib/Data/Fintype/Pi.lean	5	29	['IvanRenison', 'b-mehta', 'eric-wieser', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'plp127']	b-mehta assignee:b-mehta	1	127-81534 4 months ago	127-81534 4 months ago	73-73341 73 days
20924	tomaz1502 author:tomaz1502	feat(Computability/QueryComplexity): Oracle-based computation	This PR adds the types and lemmas for oracle-based computation. In this model, computations are run on a monad which also counts the number of oracle queries executed. With it, it becomes possible to reason about the upper bound of the query complexity of algorithms. In the future, we could extend this work to include the necessary bits from information theory and probability to also reason about lower bounds on query complexity, like the work in https://github.com/girving/debate. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2318629.20runtime.20complexity.20of.20sorting.20a.20list Co-authored-by: Geoffrey Irving --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability	305/0	Mathlib.lean,Mathlib/Computability/QueryComplexity/Basic.lean,Mathlib/Computability/QueryComplexity/Defs.lean	3	59	['eric-wieser', 'girving', 'github-actions', 'quangvdao', 'tomaz1502']	nobody	1	102-43829 3 months ago	254-37017 8 months ago	254-36995 254 days
22366	kim-em author:kim-em	feat: `check_equalities` tactic for diagnosing defeq problems	The `check_equalities` tactic, which checks the typing of equalities in the goal, reporting discrepancies between the implicit type argument of the equality, and the inferred types of the left and right hand sides, at "instances and reducible" transparency. Reports from this tactic do not necessarily indicate a problem, although typically `simp` should reduce rather than increase the reported discrepancies. `check_equalities` may be useful in diagnosing uses of `erw`.	t-meta delegated	118/3	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/CategoryTheory/CheckCompositions.lean,Mathlib/Tactic/CheckEqualities.lean,Mathlib/Tactic/Common.lean,MathlibTest/check_equalities.lean	7	16	['adomani', 'b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'kim-em', 'mathlib-bors']	nobody	1	63-48709 2 months ago	203-41278 6 months ago	15-14325 15 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	1	63-5858 2 months ago	94-13598 3 months ago	113-64174 113 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	2	59-61072 1 month ago	59-61072 1 month ago	146-18122 146 days
23669	erdOne author:erdOne	feat(FieldTheory): abelian extensions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	74/0	Mathlib.lean,Mathlib/FieldTheory/Galois/Abelian.lean,Mathlib/NumberTheory/Cyclotomic/Gal.lean	3	16	['acmepjz', 'alreadydone', 'chrisflav', 'erdOne', 'github-actions', 'mathlib-bors', 'riccardobrasca', 'xroblot']	riccardobrasca assignee:riccardobrasca	3	58-48886 1 month ago	87-53126 2 months ago	29-68817 29 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	1	56-56022 1 month ago	68-39319 2 months ago	68-39345 68 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	1	56-5864 1 month ago	90-67481 2 months ago	112-25840 112 days
27180	ADedecker author:ADedecker	feat: quotient of a monoid with zero by a multiplicative congruence	--- My motivation is getting a more conceptual construction of [ValuativeRel.ValueGroupWithZero](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Valuation/ValuativeRel.html#ValuativeRel.ValueGroupWithZero), but I think this is of independent interest. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	141/26	Mathlib.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/GroupWithZero.lean	5	31	['ADedecker', 'eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	ocfnash assignee:ocfnash	1	51-49485 1 month ago	51-62693 1 month ago	28-12053 28 days
27302	tristan-f-r author:tristan-f-r	feat(Fintype/Quotient): finLiftOn₂	The combination of [`Quotient.finLiftOn`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Data/Fintype/Quotient.html#Quotient.finLiftOn) and [`liftOn₂`](https://leanprover-community.github.io/mathlib4_docs/Init/Core.html#Quotient.liftOn%E2%82%82). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	19/0	Mathlib/Data/Fintype/Quotient.lean	1	10	['github-actions', 'kckennylau', 'tristan-f-r', 'vihdzp']	nobody	2	46-76930 1 month ago	76-2169 2 months ago	76-2203 76 days
24514	b-mehta author:b-mehta	chore(Int/GCD): use fuel in xgcd	Modify the definition of xgcd to use fuel recursion, to allow it to be reduced in the kernel. As a consequence, this means the evaluation of field operations in ZMod p become provable by `rfl` and `decide`. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/opaque.20recursion.20definitions.20break.20mergeSort.20decidability --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	44/22	Mathlib/Data/Int/GCD.lean	1	5	['astrainfinita', 'b-mehta', 'eric-wieser', 'github-actions', 'nomeata', 'urkud']	nobody	1	44-66302 1 month ago	97-8999 3 months ago	58-34020 58 days
26078	kckennylau author:kckennylau	feat(AlgebraicGeometry): add x, y, px, py for points on elliptic curves	--- Split from #25218. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry awaiting-author	44/0	Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean	1	12	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'dagurtomas', 'github-actions', 'kckennylau']	dagurtomas assignee:dagurtomas	1	43-41017 1 month ago	43-41017 1 month ago	64-11252 64 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	1	41-5144 1 month ago	42-71632 1 month ago	42-71675 42 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	1	37-39217 1 month ago	87-6924 2 months ago	87-6961 87 days
28441	euprunin author:euprunin	chore(GroupTheory/Perm): golf entire `mem_of_formPerm_ne_self`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory awaiting-author	2/5	Mathlib/GroupTheory/Perm/List.lean	1	2	['JonBannon', 'github-actions', 'tb65536']	tb65536 assignee:tb65536	1	36-30958 1 month ago	36-30958 1 month ago	13-75804 13 days
28390	euprunin author:euprunin	chore(Analysis/LocallyConvex): golf entire `polar_weak_closed`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	1/4	Mathlib/Analysis/LocallyConvex/Polar.lean	1	2	['JonBannon', 'github-actions', 'j-loreaux']	j-loreaux assignee:j-loreaux	1	34-1699 1 month ago	34-1699 1 month ago	16-76176 16 days
23940	YaelDillies author:YaelDillies	feat: polytopes	From Toric Co-authored-by: Matthew Johnson --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-analysis awaiting-author	65/0	Mathlib.lean,Mathlib/Geometry/Convex/Polytope.lean,Mathlib/Geometry/Convex/README.md	3	11	['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'j-loreaux', 'jsm28', 'leanprover-community-bot-assistant', 'ooovi']	j-loreaux assignee:j-loreaux	1	31-33656 1 month ago	31-33672 1 month ago	143-64212 143 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	1	31-5860 1 month ago	39-10138 1 month ago	39-15450 39 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	1	29-74533 29 days ago	90-37659 2 months ago	90-37697 90 days
26310	kckennylau author:kckennylau	Binary form	This PR provides the basic definition of binary forms, which are homogeneous polynomials in two variables. --- - [ ] depends on: #26312 - [ ] depends on: #26313 - [ ] depends on: #26314 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	73/0	Mathlib.lean,Mathlib/RingTheory/MvPolynomial/BinaryForm.lean	2	13	['MichaelStollBayreuth', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'ocfnash']	ocfnash assignee:ocfnash	1	29-47063 29 days ago	45-36734 1 month ago	57-1104 57 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	1	28-5860 28 days ago	37-12753 1 month ago	37-13190 37 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	1	25-31726 25 days ago	25-36730 25 days ago	95-39039 95 days
26462	PSchwahn author:PSchwahn	feat(LinearAlgebra/Projection): add results about inverse of `Submodule.prodEquivOfIsCompl`	Add two theorems `Submodule.prodEquivOfIsCompl_symm_apply` and `Submodule.prodEquivOfIsCompl_symm_add`, which are API for `Submodule.prodEquivOfIsCompl`. We believe these theorems are useful; for example, we have used their statements in a [classification formalization project](https://github.com/LieLean/LowDimSolvClassification). Co-authored by: - [Viviana del Barco](https://github.com/vdelbarc) - [Gustavo Infanti](https://github.com/GuQOliveira) - [Exequiel Rivas](https://github.com/erivas) --- I am not sure whether the `prodEquivOfIsCompl_symm_apply` theorem should be tagged with `@[simp]`; this might lead to confluence issues. Opinions are welcome! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	10/0	Mathlib/LinearAlgebra/Projection.lean	1	7	['PSchwahn', 'github-actions', 'joelriou', 'kckennylau']	joelriou assignee:joelriou	1	25-10004 25 days ago	25-41107 25 days ago	73-43225 73 days
26614	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): add more API for `take`/`drop`	These came up while proving the Girth-Diameter inequality. The main lemma proves that taking `n` vertices of a walk results in a sub-walk of taking `k` vertices when `n` is less than or equal to `k`. The sub-walk relation is represented as `p.support.Sublist q.support` where `p` and `q` are walks. - [ ] depends on: #26655 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics awaiting-author	74/0	Mathlib/Combinatorics/SimpleGraph/Walk.lean	1	18	['Rida-Hamadani', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1	24-13637 24 days ago	24-13669 24 days ago	4-83551 4 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	1	19-5838 19 days ago	26-60796 26 days ago	53-38152 53 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	1	18-45324 18 days ago	36-60996 1 month ago	131-27043 131 days
28487	euprunin author:euprunin	chore(RingTheory): golf entire `smul_eq_zero_of_mem`, `hasEval`, `eq_of_prod_eq_prod` and `isIntegral_of_mem_ringOfIntegers`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	7/16	Mathlib/RingTheory/Extension/Basic.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean,Mathlib/RingTheory/UniqueFactorizationDomain/FactorSet.lean,Mathlib/RingTheory/Valuation/AlgebraInstances.lean	4	2	['erdOne', 'github-actions']	erdOne assignee:erdOne	1	17-60808 17 days ago	17-60808 17 days ago	31-62497 31 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	1	16-73800 16 days ago	59-35693 1 month ago	73-53225 73 days
27937	madvorak author:madvorak	feat(Logic/Basic): `congr_heq₂`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic awaiting-author	6/0	Mathlib/Logic/Basic.lean	1	8	['YaelDillies', 'fpvandoorn', 'github-actions', 'madvorak', 'vihdzp']	fpvandoorn assignee:fpvandoorn	1	16-60343 16 days ago	42-61128 1 month ago	17-70200 17 days
28375	euprunin author:euprunin	chore(Analysis/SpecialFunctions/Pow): golf entire `rpow_lt_rpow_of_exponent_neg`, `rpow_le_rpow_of_exponent_nonpos`, `rpow_le_of_le_log` and `rpow_lt_of_lt_log`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	8/22	Mathlib/Analysis/SpecialFunctions/Pow/Real.lean	1	3	['JonBannon', 'Ruben-VandeVelde', 'github-actions', 'grunweg']	urkud assignee:urkud	1	16-34235 16 days ago	16-34235 16 days ago	34-46582 34 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 awaiting-author	8/2	Mathlib/Order/SuccPred/Basic.lean	1	3	['YaelDillies', 'github-actions', 'plp127', 'vihdzp']	bryangingechen assignee:bryangingechen	1	14-17958 14 days ago	14-17958 14 days ago	44-13238 44 days
29047	grunweg author:grunweg	chore(1000.yaml): add Fourier's theorem	Mathlib has some form of it already; while there is space for more advanced versions, let's surface the current progress already. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated	5/1	docs/1000.yaml	1	6	['Ruben-VandeVelde', 'bryangingechen', 'github-actions', 'mathlib-bors', 'mcdoll', 'riccardobrasca']	nobody	1	13-53319 13 days ago	36-48796 1 month ago	0-17788 4 hours
26660	strihanje01 author:strihanje01	feat(Combinatorics/Additive/VerySmallDoubling): weak non-commutative Kneser's theorem	add theorem about the structure of a doubling smaller than the golden ratio --- - [x] depends on: #28653 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import maintainer-merge new-contributor t-combinatorics	215/41	Mathlib/Algebra/Group/Action/Pointwise/Finset.lean,Mathlib/Combinatorics/Additive/VerySmallDoubling.lean	2	79	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'strihanje01']	YaelDillies assignee:YaelDillies	1	10-48371 10 days ago	10-81020 10 days ago	52-22996 52 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	29/15	Counterexamples/AharoniKorman.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/Topology/Separation/Hausdorff.lean	4	18	['NotWearingPants', 'eric-wieser', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	1	10-8868 10 days ago	21-29352 21 days ago	39-44291 39 days
28871	JaafarTanoukhi author:JaafarTanoukhi	feat(Combinatorics/Digraph): Tournaments	Define orientations and tournaments. Related to #26771. Co-authored-by: Rida Hamadani --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	62/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Digraph/Tournament.lean	3	5	['JaafarTanoukhi', 'NotWearingPants', 'Rida-Hamadani', 'github-actions']	kmill assignee:kmill	1	9-35507 9 days ago	40-25744 1 month ago	40-25778 40 days
25905	mans0954 author:mans0954	feat(RingTheory/Polynomial/SmallDegreeVieta): polynomial versions of results in Algebra.QuadraticDiscriminant	This PR continues the work from #25605. Original PR: https://github.com/leanprover-community/mathlib4/pull/25605	t-ring-theory awaiting-author	77/8	Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/RingTheory/Polynomial/SmallDegreeVieta.lean	2	46	['chrisflav', 'github-actions', 'kckennylau', 'mans0954', 'ocfnash']	chrisflav assignee:chrisflav	1	9-19669 9 days ago	10-61084 10 days ago	82-34290 82 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']	joneugster assignee:joneugster	1	9-5852 9 days ago	16-72191 16 days ago	22-35325 22 days
29798	Cyantain author:Cyantain	feat(FieldTheory/IsIntegrallyClosed): lemma to judge whether an element is integral	In this PR, we proved that an element is integral iff it's root of irreducible polynomial with unit leading coeff, which is an easy way to judge an element is integral or not, such as $\sqrt 5 / 4$, because it's root of $16x^2-5$ with not unit leading coeff, so it's not integral.	new-contributor t-algebra delegated label:t-algebra$	13/0	Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean	1	8	['Ruben-VandeVelde', 'adomani', 'github-actions', 'kckennylau', 'mathlib-bors', 'riccardobrasca']	nobody	1	8-49705 8 days ago	8-49705 8 days ago	6-29891 6 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 awaiting-author	71/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/CategoryTheory/Types/Monomorphisms.lean	3	7	['dagurtomas', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	TwoFX assignee:TwoFX	1	8-15110 8 days ago	8-15110 8 days ago	27-18061 27 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 maintainer-merge	451/3	Mathlib.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/PNat.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/GroupTheory/DivisibleHull.lean	6	106	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp', 'wwylele']	tb65536 assignee:tb65536	2	8-5852 8 days ago	15-31729 15 days ago	25-8929 25 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` stopped updating environment extensions since [lean4#6325](https://github.com/leanprover/lean4/pull/6325), and that is exactly what we use to store linter sets. At the time of writing, `importModules` might be a suitable replacement (but this is not very safe, and not documented to be stable). Instead, write a small elaborator returning the environment at the point of elaboration, and use that instead. --- - [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/)	maintainer-merge t-meta	28/12	scripts/lint-style.lean	1	13	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	1	6-46504 6 days ago	6-59821 6 days ago	15-46221 15 days
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']	chrisflav assignee:chrisflav	1	6-5839 6 days ago	17-46460 17 days ago	18-5961 18 days
10235	urkud author:urkud	feat: add `Decidable`, `Fintype`, `Encodable` linters	This PR ports the `decidableClassical`, `fintypeFinite` and `encodableCountable` linters from mathlib3: all three are environment linters which flag declarations that have a hypothesis `[Decidable p]` etc., but do not use the underlying assumption in this type. Restructuring the code can make the statement more general. The implementation is in fact quite general, and can easily adapt to include further types. PRs #17518 and #17519 are two examples of further such linters. --- Please don't fix the failures related to `HasFDerivWithinAt.pi`. Finiteness assumptions in these lemmas will be completely removed during porting to TVS. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench large-import t-linter t-meta awaiting-author	123/4	Mathlib.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/NumberTheory/JacobiSum/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Tactic.lean,Mathlib/Tactic/GeneralizeProofs.lean,Mathlib/Tactic/Linter/UnusedAssumptionInType.lean	11	n/a	['Command-Master', 'github-actions', 'grunweg', 'kmill', 'leanprover-bot', 'urkud']	nobody	1	6-5164 6 days ago	unknown	unknown
28925	grunweg author:grunweg	chore: remove `linear_combination'` tactic	When `linear_combination` was refactored in #15899, the old code was kept as the `linear_combination'` tactic, for easier migration. The consensus of the zulip discussion ([#mathlib4 > Narrowing the scope of `linear_combination` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Narrowing.20the.20scope.20of.20.60linear_combination.60/near/470237816)) was to wait, and "revisit this once people have experienced the various tactics in practice". One year later, the old tactic has almost no uses: it is unused in mathlib; [searching on github](https://github.com/search?q=linear_combination%27%20path%3A*.lean&type=code) yields 37 hits --- all of which are in various forks of mathlib. Thus, removing this tactic seems appropriate. --- Do not merge before the zulip discussion has concluded! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed awaiting-zulip	0/564	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LinearCombination'.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,MathlibTest/linear_combination'.lean	5	3	['euprunin', 'github-actions', 'grunweg']	nobody	1	5-32839 5 days ago	39-18747 1 month ago	0-1 1 second
29362	stepanholub author:stepanholub	feat:(Data/List) add the notion of period of List and prove the Periodicity Lemma	Add the concept of the period of a List (word, sequence) which is missing, and prove its basic nontrivial property describing under which conditions list can have two periods known as the Periodicity Lemma (aka Fine-Wilf Theorem). ---	t-data new-contributor	227/0	Mathlib.lean,Mathlib/Data/List/PeriodicityLemma.lean	2	125	['Ruben-VandeVelde', 'Timeroot', 'fpvandoorn', 'github-actions', 'madvorak', 'plp127', 'stepanholub', 'wwylele']	nobody	2	5-24487 5 days ago	9-27301 9 days ago	27-23498 27 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']	alreadydone assignee:alreadydone	1	4-5844 4 days ago	29-11912 29 days ago	29-31099 29 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']	YaelDillies assignee:YaelDillies	1	4-5843 4 days ago	28-52542 28 days ago	28-52577 28 days
26330	Timeroot author:Timeroot	feat: "Junk value" test file	This PR continues the work from #25173. Original PR: https://github.com/leanprover-community/mathlib4/pull/25173	t-data awaiting-author	360/0	MathlibTest/Junk.lean	1	17	['NotWearingPants', 'Timeroot', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak', 'pechersky', 'vihdzp']	pechersky assignee:pechersky	2	4-1184 4 days ago	4-1184 4 days ago	96-70055 96 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/)		332/331	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/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	73	5	['euprunin', 'github-actions', 'mathlib4-merge-conflict-bot']	dwrensha assignee:dwrensha	1	3-54374 3 days ago	18-60588 18 days ago	29-61732 29 days
29257	harahu author:harahu	doc: attach "pre", "pseudo", "semi" and "sub" as a prefixes where they are now free-standing	These are all examples of [bound morphemes](https://en.wikipedia.org/wiki/Bound_and_free_morphemes) and should be attached, either in closed form or by hyphen, to some other construct. Whether to write the resulting words with a hyphen or in closed form is a stylistic choice and I am open to discussing the specifics. I've made choices based on existing literature and what I personally found natural. --- [![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	1	3-53109 3 days ago	31-28211 1 month ago	31-28249 31 days
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 awaiting-author 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	9	['Ruben-VandeVelde', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	1	2-58512 2 days ago	2-58512 2 days ago	14-7845 14 days
26332	Timeroot author:Timeroot	feat(ModelTheory/Definability): TermDefinable functions	This PR continues the work from #23506. Original PR: https://github.com/leanprover-community/mathlib4/pull/23506	t-logic	145/0	Mathlib/Data/Rel.lean,Mathlib/ModelTheory/Definability.lean,scripts/noshake.json	3	28	['Timeroot', 'github-actions', 'mathlib4-merge-conflict-bot', 'staroperator']	fpvandoorn assignee:fpvandoorn	1	2-46750 2 days ago	18-37835 18 days ago	99-86022 99 days
27552	Equilibris author:Equilibris	chore: Move variables into `variable` declaration 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 awaiting-author	16/10	Mathlib/Data/TypeVec.lean	1	12	['Equilibris', 'eric-wieser', 'github-actions', 'pechersky', 'plp127']	pechersky assignee:pechersky	1	2-32202 2 days ago	3-85851 3 days ago	64-38904 64 days
27673	b-reinke author:b-reinke	feat(GroupTheory/FreeGroup): add cyclic reduction of words	This PR adds the definition of `reduceCyclically`. This function produces a subword of a word `w` by cancelling the first and last letters of `w` as long as possible. If `w` is reduced, the resulting word will be cyclically reduced. 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. - [x] depends on: #25966 - [x] depends on: #27672 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	76/0	Mathlib/GroupTheory/FreeGroup/CyclicallyReduced.lean	1	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	1	1-54378 1 day ago	2-68920 2 days ago	2-70232 2 days
29743	loefflerd author:loefflerd	feat(Topology/Algebra): discrete iff finite index subgroup discrete	Show that if G is a topological group and H is a finite-index subgroup, then H is discrete iff G is. --- - [x] depends on: #29648 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	153/9	Mathlib.lean,Mathlib/Data/Set/Constructions.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Algebra/IsUniformGroup/DiscreteSubgroup.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/DiscreteSubset.lean	6	8	['Ruben-VandeVelde', 'github-actions', 'loefflerd', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	j-loreaux assignee:j-loreaux	1	1-5860 1 day ago	8-41775 8 days ago	10-82107 10 days
27207	pechersky author:pechersky	feat(Topology/WithVal): ValuativeRel (WithVal v)	with a helper valuation defined that does not pierce defeq --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology label:t-algebra$	20/1	Mathlib/Topology/Algebra/Valued/WithVal.lean	1	8	['alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot', 'pechersky', 'smmercuri']	alreadydone assignee:alreadydone	1	0-70289 19 hours ago	39-85290 1 month ago	73-51564 73 days
27465	erdOne author:erdOne	feat: the definition of nonarchimedean local fields	--- - [x] depends on: #27430 - [x] depends on: #27412 - [x] depends on: #27213 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-number-theory	214/25	Mathlib.lean,Mathlib/NumberTheory/LocalField/Basic.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	5	61	['erdOne', 'faenuccio', 'github-actions', 'kbuzzard', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky', 'riccardobrasca']	tb65536 assignee:tb65536	1	0-48809 13 hours ago	1-58099 1 day ago	14-69165 14 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$	117/0	Mathlib.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Flat/Basic.lean,Mathlib/RingTheory/Nilpotent/Defs.lean,Mathlib/RingTheory/Nilpotent/GeometricallyReduced.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	6	72	['dleijnse', 'github-actions', 'joelriou', 'kckennylau']	joelriou assignee:joelriou	1	0-46214 12 hours ago	0-46251 12 hours ago	67-58063 67 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 maintainer-merge	192/1	Mathlib.lean,Mathlib/Analysis/Convex/StdSimplex.lean,Mathlib/LinearAlgebra/Finsupp/Pi.lean,Mathlib/Topology/Algebra/Monoid/FunOnFinite.lean	4	6	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	YaelDillies assignee:YaelDillies	1	0-44829 12 hours ago	0-67101 18 hours ago	34-38735 34 days
30154	YaelDillies author:YaelDillies	chore(Order/Filter/Finite): clean up	`protected alias` works now. Also write a module doc. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-order easy	4/11	Mathlib/Order/Filter/Finite.lean	1	2	['Ruben-VandeVelde', 'github-actions']	nobody	1	0-43313 12 hours ago	0-43313 12 hours ago	0-62133 17 hours
29759	NotWearingPants author:NotWearingPants	feat(Analysis/SpecificLimits/Fibonacci): prove that the ratio of consecutive Fibonacci numbers tends to the golden ratio	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge new-contributor t-analysis	36/0	Mathlib.lean,Mathlib/Analysis/SpecificLimits/Fibonacci.lean	2	7	['NotWearingPants', 'Ruben-VandeVelde', 'github-actions', 'kckennylau']	nobody	2	0-42952 11 hours ago	0-42953 11 hours ago	8-11929 8 days
25971	joelriou author:joelriou	feat(CategoryTheory): pseudofunctors to Cat	This PR adds convenience lemmas for pseudofunctors to `Cat`, mostly using the `to_app` attribute. The simp set for the `to_app` attribute is extended in order to take into account that in `Cat`, associators and unitors induce identities. --- - [x] depends on: #30134 This PR continues the work from #24384. Original PR: https://github.com/leanprover-community/mathlib4/pull/24384	t-category-theory	170/20	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Cat.lean,Mathlib/CategoryTheory/Bicategory/Grothendieck.lean,Mathlib/CategoryTheory/Bicategory/Strict/Pseudofunctor.lean,Mathlib/Tactic/CategoryTheory/ToApp.lean,MathlibTest/CategoryTheory/ToApp.lean	6	14	['callesonne', 'chrisflav', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'yuma-mizuno']	nobody	1	0-31079 8 hours ago	1-29424 1 day ago	1-49050 1 day
29820	wwylele author:wwylele	feat(RingTheory): {Mv}PowerSeries.{le_}{weighted}Order_prod	The big operator version of `{le}_{weighted}Order_mul` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory maintainer-merge	41/0	Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/MvPowerSeries/Order.lean,Mathlib/RingTheory/PowerSeries/Order.lean	3	4	['Ruben-VandeVelde', 'github-actions', 'wwylele']	mattrobball assignee:mattrobball	1	0-29425 8 hours ago	0-29460 8 hours ago	14-16572 14 days
26282	AntoineChambert-Loir author:AntoineChambert-Loir	feat: a theorem of Jordan on primitive subgroups of the permutation group	A theorem of Jordan on the primitive subgroups of a permutation group: * if it contains a swap, it is equal to the permutation group, * if it contains a 3-cycle, it contains the alternating group. This PR continues the work from #24131. --- - [x] depends on: #26281 - [x] depends on: #26280 - [x] depends on: #26279 Original PR: https://github.com/leanprover-community/mathlib4/pull/24131 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory large-import maintainer-merge	939/137	Mathlib.lean,Mathlib/Data/Set/Card.lean,Mathlib/GroupTheory/GroupAction/FixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/Jordan.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/Primitive.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/SetTheory/Cardinal/Embedding.lean	11	n/a	['AntoineChambert-Loir', 'adomani', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'tb65536']	nobody	1	0-28192 7 hours ago	unknown	unknown
30162	bryangingechen author:bryangingechen	ci(label_new_contributor.yml): only trigger when PR is opened	Currently, this is triggered even when new bots push a commit to a PR (e.g. the pre-commit.ci bot); adding the `types` filter will prevent the `new-contributor` label being added in such cases. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	8/1	.github/workflows/label_new_contributor.yml	1	4	['bryangingechen', 'github-actions', 'pechersky']	nobody	1	0-25403 7 hours ago	0-48137 13 hours ago	0-48116 13 hours
29924	pelicanhere author:pelicanhere	feat(RingTheory): local properties of semilocal rings	Proves local properties of semilocal rings, which wiil be used in Iwasawa theory. For a natural language proof, see [lean-iwasawa](https://acmepjz.github.io/lean-iwasawa/blueprint/sect0002.html#a0000000013) (slightly different from this PR). > > > > [![Open in Gitpod](https://camo.githubusercontent.com/b04f5659467d23b5109ba935a40c00decd264eea25c22d50a118021349eea94f/68747470733a2f2f676974706f642e696f2f627574746f6e2f6f70656e2d696e2d676974706f642e737667)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	183/6	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/PID.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/LocalProperties/IntegrallyClosed.lean,Mathlib/RingTheory/LocalProperties/Semilocal.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean	6	45	['github-actions', 'kckennylau', 'pelicanhere']	chrisflav assignee:chrisflav	1	0-5862 1 hour ago	9-82727 9 days ago	9-82767 9 days
29988	pechersky author:pechersky	chore(RingTheory/PrimitiveRoots): switch argument for `isUnit` from `0 < k` to `k ≠ 0`	Did not do this for all lemmas in `IsPrimitiveRoot` namespace which is still heterogeneous between - `NeZero k` - `0 < k` - `k ≠ 0` Note: there will always be some mismatch in hypotheses, because core has lemmas about divisibility in `0 < k` hypothesis form On the way to describing the torsion subgroup, as requested in #29517 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	26/26	Mathlib/FieldTheory/KummerExtension.lean,Mathlib/NumberTheory/Cyclotomic/CyclotomicCharacter.lean,Mathlib/NumberTheory/Cyclotomic/Rat.lean,Mathlib/NumberTheory/MulChar/Lemmas.lean,Mathlib/RingTheory/Frobenius.lean,Mathlib/RingTheory/RootsOfUnity/EnoughRootsOfUnity.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean	7	4	['Ruben-VandeVelde', 'github-actions']	riccardobrasca assignee:riccardobrasca	1	0-5859 1 hour ago	7-78536 7 days ago	7-78610 7 days
12608	eric-wieser author:eric-wieser	feat: allow `nsmul` / `zsmul` to be omitted again, with a warning	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-meta merge-conflict awaiting-author label:t-algebra$	118/2	Mathlib.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/DefaultFieldLinter.lean,scripts/noshake.json,test/default_field_linter.lean	6	12	['YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions']	nobody	1	429-66283 1 year ago	478-61347 1 year ago	5-72414 5 days
12934	grunweg author:grunweg	chore: replace more uses of > or ≥ by < or ≤	These were flagged by the linter in https://github.com/leanprover-community/mathlib4/pull/12879: it is easy to simple avoid > or ≥ in hypotheses or haves. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author help-wanted	41/42	Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2019Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib/Tactic/Linarith/Datatypes.lean,test/cancel_denoms.lean,test/congr.lean,test/interval_cases.lean,test/observe.lean	15	11	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'jcommelin', 'urkud']	nobody	1	429-66283 1 year ago	442-75880 1 year ago	1-73101 1 day
8519	eric-wieser author:eric-wieser	refactor(LinearAlgebra/TensorProduct): golf using `liftAddHom`	This new `TensorProduct.liftAddHom` doesn't require bilinearity, only that scalar multiplication can be moved between the arguments. While in theory we only need the `AddMonoidHom` version as it offers exactly the same generality, we first provide an unbundled `liftFun` as this seems to give a sizeable performance boost if used in downstream `lift` variants. --- - [x] depends on: #8571 - [x] depends on: #8584 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	53/50	Mathlib/Algebra/Category/AlgebraCat/Monoidal.lean,Mathlib/LinearAlgebra/TensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean	3	28	['bustercopley', 'eric-wieser', 'jcommelin', 'jjaassoonn', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib-bors']	nobody	1	429-66280 1 year ago	578-38595 1 year ago	5-6524 5 days
9146	laughinggas author:laughinggas	feat(Data/ZMod/Defs): Topological structure on `ZMod`	Added a discrete topology structure to `ZMod n` for all `n` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict awaiting-author label:t-algebra$	55/3	Mathlib.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Instances/ZMod.lean,Mathlib/Topology/Maps.lean	5	61	['YaelDillies', 'eric-wieser', 'github-actions', 'jcommelin', 'laughinggas', 'mo271', 'urkud']	nobody	1	429-66280 1 year ago	610-74408 1 year ago	7-6153 7 days
6777	adomani author:adomani	chore(CovariantClass): replace eta-expanded (· ·), (· + ·), (· ≤ ·), (· < ·)	Replace `CovariantClass X X (· * ·) (· ≤ ·)` with -> `CovariantClass X X HMul.hMul LE.le` and similarly for `HAdd`, `LT`, `Contravariant`. This PR is inspired by [Issue #6646](https://github.com/leanprover-community/mathlib4/issues/6646) and, more specifically, [this comment](https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1692792066). Note that https://github.com/leanprover/lean4/pull/2267 would make this unnecessary --- ```bash # First sed command: # the first captured pattern is `CovariantClass ` # the second captured pattern is `` # the third captured pattern is `+` or `` # the fourth captured pattern is `<` or `≤` # a match for `CovariantClass (· ·) (· ·)` becomes # `CovariantClass replaceop replaceop` # Second sed command: similar to the first, but looks for `(Function.swap (· ·))` sed -i ' s=$Co[ntra]variantClass \(..$ \2 \)(· $[+]$ ·) (· $[<≤]$ ·)=\1replaceop\3 replaceop\4=g s=$Co[ntra]variantClass \(..$ \2 \)($[Functio\.swap ]$(· $[+]$ ·)) (· $[<≤]$ ·)=\1(\3replaceop\4) replaceop\5=g s=replaceop+=HAdd.hAdd=g s=replaceop\=HMul.hMul=g s=replaceop<=LT.lt=g s=replaceop≤=LE.le=g s=$Co[ntra]variantClass N N$ (· \ ·) r=\1 HMul.hMul r=g s=$Co[ntra]variantClass N N (swap μ)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass N N$ (swap (· \* ·)) r=\1 (swap HMul.hMul) r=g s=$CovariantClass (Filter α) (Filter α)$ (· / ·) (· ≤ ·)=\1 HDiv.hDiv LE.le=g s=$CovariantClass (Filter α) (Filter α)$ (swap (· / ·)) (· ≤ ·)=\1 (swap HDiv.hDiv) LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· < ·)=\1 LT.lt=g s=$Co[ntra]variantClass [^}]$ (· ≤ ·)=\1 LE.le=g s=$CovariantClass .* (Filter β)$ (· • ·) LE.le=\1 HSMul.hSMul LE.le=g ' $(git ls-files '*.lean') ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	703/678	Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/Bounds.lean,Mathlib/Algebra/CovariantAndContravariant.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/GroupPower/Order.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Archimedean.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/MinMax.lean,Mathlib/Algebra/Order/Group/OrderIso.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Interval.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/LatticeGroup.lean,Mathlib/Algebra/Order/Module.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Cancel/Defs.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Lemmas.lean,Mathlib/Algebra/Order/Monoid/MinMax.lean,Mathlib/Algebra/Order/Monoid/NatCast.lean,Mathlib/Algebra/Order/Monoid/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Prod.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithZero/Basic.lean,Mathlib/Algebra/Order/Monoid/WithZero/Defs.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Pointwise.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Lemmas.lean,Mathlib/Algebra/Order/Sub/Basic.lean,Mathlib/Algebra/Order/Sub/Canonical.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Order/WithZero.lean,Mathlib/Algebra/Parity.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Normed/Order/Lattice.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/List/BigOperators/Basic.lean,Mathlib/Data/List/BigOperators/Lemmas.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Nat/Cast/Order.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/Real/ENNReal.lean,Mathlib/Data/Real/NNReal.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/Data/Sign.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/VectorMeasure.lean,Mathlib/Order/ConditionallyCompleteLattice/Group.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Martingale/Basic.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/PGame.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/NaturalOps.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Topology/ContinuousFunction/Algebra.lean,lean-toolchain,test/Recall.lean,test/propose.lean	81	36	['adomani', 'alreadydone', 'digama0', 'eric-wieser', 'ericrbg', 'jcommelin', 'leanprover-bot', 'sgouezel']	nobody	1	429-66279 1 year ago	451-46983 1 year ago	35-56459 35 days
6403	astrainfinita author:astrainfinita	chore: change instance priorities of `Ordered*` hierarchy	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-order t-algebra merge-conflict awaiting-author label:t-algebra$	253/79	Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Field/Canonical/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/WithZero/Defs.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Star.lean,Mathlib/Algebra/Order/WithZero.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/RingTheory/HahnSeries.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	18	39	['Vierkantor', 'astrainfinita', 'digama0', 'eric-wieser', 'j-loreaux', 'leanprover-bot']	nobody	1	429-66278 1 year ago	488-23348 1 year ago	13-18399 13 days
3757	thorimur author:thorimur	feat: config options for `fail_if_no_progress`	This PR creates config options for `fail_if_no_progress` that allow the user to tweak what exactly counts as "progress". This includes whether to use defeq or `BEq`, what transparency to use, and which parts of the goal and local context to check. It also splits off the comparison functionality into `Mathlib.Lean.Meta.Compare`, which provides fully configurable comparison functions for common complex metaprogramming types not specific to `fail_if_no_progress`. These types are `Expr`, `LocalDecl`, `LocalContext`, `MetavarDecl`, `MVarId`, and `List MVarId`. --- See [zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/progress.20on.20fail_if_no_progress) for a couple review questions. Status update: this PR is now basically done, save for some extra tests which should probably be included. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict WIP	603/54	Mathlib.lean,Mathlib/Lean/Meta.lean,Mathlib/Lean/Meta/Compare.lean,Mathlib/Tactic/FailIfNoProgress.lean,test/fail_if_no_progress.lean	5	38	['alexjbest', 'github-actions', 'joneugster', 'kim-em', 'thorimur']	nobody	1	429-66277 1 year ago	681-77463 1 year ago	45-49113 45 days
12751	Command-Master author:Command-Master	feat: add lemmas for Nat/Bits, Nat/Bitwise and Nat/Size	Remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict	66/7	Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Size.lean	4	26	['Command-Master', 'Rida-Hamadani', 'Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'jcommelin']	nobody	1	410-43580 1 year ago	415-59822 1 year ago	54-52408 54 days
15448	urkud author:urkud	chore(*): deprecate `Option.elim'`	Use `Option.elim` instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt merge-conflict awaiting-author	54/50	Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/Calculus/LagrangeMultipliers.lean,Mathlib/CategoryTheory/Category/PartialFun.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Data/Option/Defs.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/Logic/Embedding/Set.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/Topology/Compactness/Paracompact.lean,Mathlib/Topology/LocallyFinite.lean	17	12	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'grunweg', 'urkud']	nobody	1	410-32633 1 year ago	411-21780 1 year ago	7-18420 7 days
11800	JADekker author:JADekker	feat : Define KappaLindelöf spaces	Define KappaLindelöf spaces by following the first one-third of the API for Lindelöf spaces. The remainder will be added in a future PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-topology merge-conflict please-adopt	301/2	Mathlib.lean,Mathlib/Topology/Compactness/KappaLindelof.lean,Mathlib/Topology/Compactness/Lindelof.lean	3	38	['ADedecker', 'JADekker', 'PatrickMassot', 'StevenClontz', 'adomani', 'github-actions', 'grunweg', 'kim-em', 'urkud']	nobody	1	382-78451 1 year ago	383-14026 1 year ago	119-10687 119 days
11500	mcdoll author:mcdoll	refactor(Topology/Algebra/Module/WeakDual): Clean up	- Move `Dual` and `dualPairing` lower in the import-hierachy - deduplicate `dualPairing` - Bundle continuity statements to `CLM`s. - Make `WeakDual` and `WeakSpace` reducible - Remove `refine'` in favor of `refine` --- Cleaning up `Analysis/NormedSpace/WeakDual` will be done in a second PR [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict awaiting-author	227/179	Mathlib.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/NormedSpace/Dual.lean,Mathlib/Analysis/NormedSpace/WeakDual.lean,Mathlib/Analysis/VonNeumannAlgebra/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/Dual.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,docs/overview.yaml,docs/undergrad.yaml	15	14	['ADedecker', 'grunweg', 'j-loreaux', 'kkytola', 'mathlib-bors', 'mcdoll']	nobody	2	360-79415 11 months ago	360-79415 11 months ago	46-5572 46 days
12133	ADedecker author:ADedecker	feat: generalize instIsLowerProd to arbitrary products	Also change a bit the proof of the product case to match my own taste, feel free to tell if you prefer the old one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-topology merge-conflict awaiting-author	34/14	Mathlib/Topology/Constructions.lean,Mathlib/Topology/Order/LowerUpperTopology.lean	2	13	['Ruben-VandeVelde', 'TwoFX', 'github-actions', 'jcommelin', 'mans0954', 'mathlib-bors', 'riccardobrasca']	nobody	2	322-65485 10 months ago	322-65485 10 months ago	63-69206 63 days
17176	arulandu author:arulandu	feat: integrals and integrability with .re	Lemmas for swapping order of .re and integration/integrability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict awaiting-author	49/0	Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean	4	30	['EtienneC30', 'arulandu', 'github-actions', 'loefflerd']	nobody	1	247-27812 8 months ago	247-27812 8 months ago	9-73631 9 days
2605	eric-wieser author:eric-wieser	chore: better error message in linarith	On this mwe: ```lean import Mathlib.Tactic.Linarith example (s : Set ℕ) (h : s = s) : 0 ≤ 1 := by linarith ``` this now indicates where the internal error is coming from. Is there a better way of chaining errors than this? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author	12/1	Mathlib/Tactic/Linarith/Preprocessing.lean	1	3	['Vierkantor', 'harahu', 'kim-em', 'mo271']	nobody	1	246-43972 8 months ago	681-17259 1 year ago	4-7271 4 days
17005	YnirPaz author:YnirPaz	feat(SetTheory/Cardinal/Regular): define singular cardinals	Define singular cardinals and prove basic lemmas about them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict WIP	94/1	Mathlib.lean,Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/SetTheory/Ordinal/Basic.lean	3	28	['YaelDillies', 'YnirPaz', 'github-actions', 'vihdzp']	nobody	1	228-78144 7 months ago	304-71326 10 months ago	34-18388 34 days
18463	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Notation/FundamentalSequence): define type of fundamental sequences	We define `Sequence α` as the type of sequences with length 0, 1, or `ω`, and give a basic API. A subsequent PR will introduce the notion of a (countable and computable) fundamental sequence and establish basic results. The goal of this is to generalize [`ONote.fundamentalSequence`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/SetTheory/Ordinal/Notation.html#ONote.fundamentalSequence) to allow the construction of fundamental sequences for other ordinal notations. --- See [my ordinal notation repository](https://github.com/vihdzp/ordinal-notation/blob/a6fdd7fe7cb521e686ea271902e7e5496f1804d3/OrdinalNotation/Cantor.lean#L1218) for a demonstration of how this API looks in practice. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-order merge-conflict	174/1	Mathlib.lean,Mathlib/SetTheory/Ordinal/Notation/Cantor.lean,Mathlib/SetTheory/Ordinal/Notation/FundamentalSequence.lean	3	19	['YnirPaz', 'b-mehta', 'github-actions', 'vihdzp']	nobody	1	226-77521 7 months ago	226-77521 7 months ago	52-25108 52 days
15991	vihdzp author:vihdzp	feat(SetTheory/Ordinal/CantorNormalForm): alternate CNF recursion principle	The idea of this recursion principle is that you can build an ordinal by adding one power of `b` at a time, as long as `1 < b ≤ ω`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-logic merge-conflict awaiting-author	43/0	Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/CantorNormalForm.lean,Mathlib/SetTheory/Ordinal/Exponential.lean	3	8	['YaelDillies', 'eric-wieser', 'github-actions', 'vihdzp']	nobody	1	199-55473 6 months ago	199-55473 6 months ago	91-50443 91 days
19189	YnirPaz author:YnirPaz	feat(SetTheory/Ordinal/Arithmetic): order isomorphism between omega and the natural numbers	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict awaiting-author	44/0	Mathlib/Order/SuccPred/Limit.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean	2	21	['YaelDillies', 'YnirPaz', 'github-actions', 'vihdzp']	nobody	1	196-85355 6 months ago	196-85355 6 months ago	47-37012 47 days
19275	eric-wieser author:eric-wieser	fix: if nolint files change, do a full rebuild	Otherwise CI will succeed when removing entries from the file, but fail later when someone changes something unrelated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict delegated	8/0	lakefile.lean	1	20	['YaelDillies', 'adomani', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	1	182-43816 5 months ago	182-43816 5 months ago	0-214 3 minutes
23411	PatrickMassot author:PatrickMassot	chore: remove finiteness from Order.Filter.Lift	Co-authored-by: Anatole Dedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	longest-pole t-topology merge-conflict	48/21	Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Order/Filter/Lift.lean,Mathlib/Order/Filter/SmallSets.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Basic.lean	7	4	['Vierkantor', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	1	178-61883 5 months ago	178-81452 5 months ago	10-21608 10 days
19425	hrmacbeth author:hrmacbeth	perf: gcongr forward-reasoning adjustment	This PR changes the "forward-reasoning" component of `gcongr`, rendering it more efficient, particularly in problems with a large number of variables/hypotheses in the context. Previously `gcongr` attempted to match every `LocalDecl` against every node in the parse tree using each of the five implemented `@[gcongr_forward]` mini-tactics: matching directly, matching after applying `symm`, matching after applying `le_of_lt`, etc etc. The new algorithm filters out the non-Prop `LocalDecl`s, and also adjusts the `@[gcongr_forward]` extensions so that, rather than re-apply the relevant lemmas (`symm`, `le_of_lt`, etc) at every node in the parse tree, the lemmas are applied in advance to the `LocalDecl`s and the result (if successful) stored. The performance effect on mathlib as a whole is miniscule, but it speeds up the profiler's count of "tactic execution of Mathlib.Tactic.GCongr" in the newly-added test from 257 ms to 47 ms, and has a similar effect on real-life examples in an analysis project of mine. Co-authored-by: Mario Carneiro --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) (Note that Mario provided the ideas but not the code, so please review with appropriate diligence!)	merge-conflict awaiting-author	130/59	Mathlib/Order/Lattice.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GCongr/ForwardAttr.lean,MathlibTest/GCongr/inequalities.lean	4	17	['Vierkantor', 'github-actions', 'hrmacbeth', 'leanprover-bot', 'leanprover-community-bot-assistant']	Vierkantor assignee:Vierkantor	1	176-60334 5 months ago	176-60336 5 months ago	4-16654 4 days
12673	grunweg author:grunweg	feat: add ContDiff.lipschitzOnWith	A C¹ function is Lipschitz on each convex compact set. From sphere-eversion. -------- Commits can be reviewed independently. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict awaiting-author help-wanted	30/11	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean	1	6	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'sgouezel']	nobody	1	169-40412 5 months ago	169-40412 5 months ago	1-7552 1 day
8370	eric-wieser author:eric-wieser	refactor(Analysis/NormedSpace/Exponential): remove the `𝕂` argument from `exp`	This argument is still needed for almost all the lemmas, which means it can longer be found by unification. We keep around `expSeries 𝕂 A`, as it's needed for talking about the radius of convergence over different base fields. This is a prerequisite for #8372, as we can't merge the functions until they have the same interface.\ Zulip thread: [#mathlib4 > Real.exp @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Real.2Eexp/near/401602245) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This is started from the mathport output on https://github.com/leanprover-community/mathlib/pull/19244	awaiting-zulip t-analysis merge-conflict	432/387	Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/Analysis/Normed/Algebra/QuaternionExponential.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/NormedSpace/DualNumber.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean	11	29	['YaelDillies', 'eric-wieser', 'girving', 'github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-community-bot-assistant', 'urkud']	nobody	1	162-7078 5 months ago	173-35708 5 months ago	29-60989 29 days
19315	quangvdao author:quangvdao	feat(Data/Finsupp/Fin): Add `Finsupp` operations on `Fin` tuple	This PR adds more analogues of operations on `Fin` tuples to the `Finsupp` setting. Before, there were only `Finsupp.cons` and `Finsupp.tail`. Now there are also `Finsupp.snoc`, `Finsupp.insertNth`, `Finsupp.init`, and `Finsupp.removeNth`. These all come with supporting lemmas. I also removed the porting comment about `succAboveCases` in `Data/Fin/Basic`, and added a lemma about `succAbove` in `Data/Fin/Tuple/Basic`. --- - [x] depends on: #20361 - [x] depends on: #20771 - [x] depends on: #20770 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict awaiting-author	193/16	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Data/Finsupp/Fin.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,scripts/nolints_prime_decls.txt	6	44	['YaelDillies', 'github-actions', 'j-loreaux', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'quangvdao']	nobody	1	150-16939 4 months ago	150-16939 4 months ago	43-81255 43 days
7907	urkud author:urkud	feat: introduce `NthRoot` notation class	Also use it for `Real.sqrt`, and replace the few occurrences of `sqrt` that do not already use the notation. --- [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/.60Sqrt.60.20notation.20typeclass/near/400086502) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis awaiting-CI merge-conflict label:t-algebra$	193/156	Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1960Q2.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Mathlib.lean,Mathlib/Algebra/NthRoot.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Asymptotics.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Data/Real/GoldenRatio.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/ConvexBody.lean,Mathlib/NumberTheory/NumberField/ClassNumber.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/Probability/Distributions/Gaussian.lean,MathlibTest/positivity.lean	28	9	['eric-wieser', 'github-actions', 'kmill', 'urkud']	nobody	1	148-44053 4 months ago	402-57611 1 year ago	0-0 0 seconds
13685	niklasmohrin author:niklasmohrin	feat(Combinatorics): add definitions for network flows	Although we might not have any super-interesting results ready for mathlib yet, I feel that the definitions from this commit are already mature enough to include. These definitions are ported from last semester's work we did at https://github.com/niklasmohrin/lean-seminar-2023 and I have put some time in to refactor our code to `Int` and now to any parameter `R`. In the linked repository, there is some more stuff that I can send in. One obstacle without integer values is that it is not clear why a maximum flow would exist. I think the best way to tackle this would be to prove max-flow-min-cut theorem and implement the Ford-Fulkerson algorithm. It has been pointed out on Zulip that there is an [Isabelle formalization of the Edmonds Karp Algorithm](https://www.isa-afp.org/entries/EdmondsKarp_Maxflow.html). I feel that the definitions are pretty solid and it makes sense to include them, even if just for unifying definitions across downstream projects. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics merge-conflict awaiting-author	244/0	Mathlib.lean,Mathlib/Combinatorics/Flow/Basic.lean,docs/references.bib	3	57	['Shreyas4991', 'YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak', 'niklasmohrin']	nobody	1	142-7176 4 months ago	142-7178 4 months ago	86-21072 86 days
17129	joneugster author:joneugster	feat(Tactic/Linter): add unicode linter for unicode variant-selectors	Unicode characters can be followed by one of the two "variant-selectors" `\FE0E` (text) or `\FE0F` (emoji). These appear to the user as a single unicode character and they might copy them by accident. For example `✅️` (`\u2705\uFE0F`), `✅` (`\u2705`) and `✅︎` (`\u2705\uFE0E`) are three variants of the "same" unicode character. The one without variant-selector might display as either emoji or not, depending on the user's device and font. Add unicode linter ensuring variant-selector only appear on specified characters and also ensuring these characters always have the correct variant selector to avoid confusions. Everything flagged by this linter can be fixed fully automatically with `lake exe lint-style --fix` or by commenting `bot fix style` on the PR. --- - tracking PR: #16215 ## Zulip discussions: - https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F - https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Lean.20specific.20font ## Related PRs: - leanprover/lean4#5015 added some emoji-variant selectors to Emojis used in `Lean` itself. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict delegated awaiting-author	245/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnicodeLinter.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CongrM.lean,Mathlib/Tactic/Widget/Conv.lean,Mathlib/Tactic/Widget/GCongr.lean,Mathlib/Topology/ContinuousMap/Weierstrass.lean,MathlibTest/LintStyleTextBased.lean	11	25	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant']	nobody	1	140-37838 4 months ago	140-37840 4 months ago	82-54712 82 days
21476	grunweg author:grunweg	feat(lint-style): enable running on downstream projects	Enable lint-style to run on downstream projects, by making the following modifications: - allow passing an explicit list of libraries to lint: if nothing is passed, it lints `Mathlib`, `Archive` and `Counterexamples` (as before); otherwise, it lints precisely the passed modules - only check init imports, undocumented scripts and the errors from `lint-style.py` when linting Mathlib - make the style exceptions file configurable and optional: using the `nolints-file` flag, the exceptions file can be configured. If the flag is omitted, we try to find a file at `scripts/nolints-style.txt` --- and otherwise proceed with no style exceptions. This means mathlib can continue unchanged, and downstream projects can either add an explicit exceptions file, or proceed without any exceptions. After this PR, one should be able to run lint-style on a downstream project by `lake exe lint-style ProjectName`. Prompted by [this zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/lint-style.20for.20downstream.20libraries). --- - [ ] depends on: #24570 - [ ] depends on: #24953 (I did not test the last part.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	58/19	Mathlib/Tactic/Linter/TextBased.lean,scripts/lint-style.lean	2	19	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	joneugster assignee:joneugster	1	130-51168 4 months ago	130-51171 4 months ago	43-17409 43 days
24965	erdOne author:erdOne	refactor: Make `IsLocalHom` take unbundled map	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-algebra merge-conflict awaiting-author label:t-algebra$	16/7	Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace/HasColimits.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean	5	6	['alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	1	122-86279 4 months ago	122-86280 4 months ago	10-26015 10 days
17627	hrmacbeth author:hrmacbeth	feat: universal properties of vector bundle constructions	Characterizations for the smoothness of maps into the total spaces of (1) the direct sum of two vector bundles; (2) the pullback of a vector bundle. This gap in the library was exposed by #17358. --- - [x] depends on: #22804 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict delegated	311/9	Mathlib/Data/Bundle.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Pullback.lean,Mathlib/Topology/FiberBundle/Constructions.lean	4	24	['PatrickMassot', 'github-actions', 'grunweg', 'hrmacbeth', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'sgouezel']	grunweg assignee:grunweg	1	90-81726 2 months ago	90-81726 2 months ago	91-73632 91 days
26608	vihdzp author:vihdzp	feat(SetTheory/Cardinal/Aleph): `o.card ≤ ℵ_ o` and variants	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	24/0	Mathlib/SetTheory/Cardinal/Aleph.lean	1	3	['github-actions', 'kckennylau', 'leanprover-community-bot-assistant']	nobody	1	70-24909 2 months ago	70-24910 2 months ago	23-63406 23 days
25401	digama0 author:digama0	feat(Util): SuppressSorry option	See also leanprover/lean4#8611 and [#lean4 > Silent sorry @ 💬](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Silent.20sorry/near/503537964). This is a stop-gap solution while leanprover/lean4#8611 is underway, but it works about as well as any other built in option. Hooking declaration elaborators turns out to be a very powerful technique. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	342/0	Mathlib.lean,Mathlib/Util/CommandElabHook.lean,Mathlib/Util/SuppressSorry.lean,MathlibTest/suppressSorry.lean	4	15	['digama0', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	1	51-11401 1 month ago	51-11401 1 month ago	71-28549 71 days
28150	Equilibris author:Equilibris	chore: clean up proofs typevec proofs	While adding variable universe corecs I found a lot of theorems in typevec that could do with a bit of a clean-up --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict	24/26	Mathlib/Data/TypeVec.lean	1	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	1	42-11323 1 month ago	42-11324 1 month ago	13-49738 13 days
27437	kckennylau author:kckennylau	feat(RingTheory/Valuation): some lemmas about comparing with 1 and 0 and with each other	From the 2025 Local Class Field Theory Workshop. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict WIP	109/22	Mathlib/NumberTheory/Padics/ValuativeRel.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Extension.lean,Mathlib/RingTheory/Valuation/ValuativeRel.lean	4	20	['erdOne', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'matthewjasper', 'pechersky']	nobody	1	37-41456 1 month ago	37-41457 1 month ago	14-30610 14 days
26912	pechersky author:pechersky	chore(Algebra/Ring/Subring): simp tag `Subring.smul_def`	s-multiplying by a subtype is easiest to manipulate when both terms are in the ambient type. Many places that had to use the _def lemma for a rewrite, or to include it in a simp set, no longer have to. Ported from #25308 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) I found this being not-simp frustrating when talking about submodules over a valuation subring.	maintainer-merge t-algebra merge-conflict label:t-algebra$	68/67	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Exact.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Ring/Periodic.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/LinearAlgebra/RootSystem/Irreducible.lean,Mathlib/LinearAlgebra/RootSystem/RootPositive.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/RingTheory/Etale/Kaehler.lean,Mathlib/RingTheory/LocalProperties/Projective.lean,Mathlib/RingTheory/Localization/InvSubmonoid.lean,Mathlib/RingTheory/OreLocalization/Basic.lean	25	19	['artie2000', 'eric-wieser', 'github-actions', 'j-loreaux', 'linesthatinterlace', 'mathlib4-merge-conflict-bot', 'pechersky']	joelriou assignee:joelriou	1	32-47770 1 month ago	32-47771 1 month ago	51-74059 51 days
28737	astrainfinita author:astrainfinita	refactor: deprecate `MulEquivClass`	This PR continues the work from #18806. Original PR: https://github.com/leanprover-community/mathlib4/pull/18806	maintainer-merge t-algebra merge-conflict awaiting-author label:t-algebra$	67/77	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Irreducible/Lemmas.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/Algebra/GroupWithZero/Equiv.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Ring/Divisibility/Basic.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/Star/MonoidHom.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/GroupTheory/Submonoid/Center.lean,Mathlib/LinearAlgebra/FreeModule/Finite/CardQuotient.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean	26	20	['Vierkantor', 'alreadydone', 'astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	1	23-51630 23 days ago	23-51631 23 days ago	4-17723 4 days
21950	erdOne author:erdOne	feat(NumberTheory/Padics): the completion of `ℚ` at a finite place is `ℚ_[p]`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory merge-conflict	253/1	Mathlib.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroMulInt.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	7	33	['Ruben-VandeVelde', 'erdOne', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky', 'smmercuri', 'xroblot']	nobody	1	7-43857 7 days ago	88-43794 2 months ago	79-1228 79 days
13514	madvorak author:madvorak	feat(Computability/ContextFreeGrammar): closure under union	- [ ] depends on: #15895 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability merge-conflict blocked-by-other-PR	448/4	Mathlib/Computability/ContextFreeGrammar.lean	1	50	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'leanprover-community-mathlib4-bot', 'madvorak']	nobody	1	335-59437 11 months ago	335-59437 11 months ago	72-28392 72 days
29610	llllvvuu author:llllvvuu	feat(LinearAlgebra): define LinearMap.Eigenbasis	Some theorems are left TODO for follow-up work. The definition is from @eric-wieser ([#Is there code for X? > diagonalizable linear maps @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/diagonalizable.20linear.20maps/near/539163222)). Co-authored-by: Aristotle Harmonic --- - [x] depends on: #29420 (golfs some `[Nontrivial R]` assumptions) - [ ] depends on: #29791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	458/5	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/LinearAlgebra/Eigenbasis.lean,Mathlib/LinearAlgebra/FreeModule/PID.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/CompleteLattice/Basic.lean	6	29	['github-actions', 'kckennylau', 'llllvvuu', 'mathlib4-dependent-issues-bot']	nobody	1	8-34954 8 days ago	15-2819 15 days ago	3-22329 3 days

All open PRs

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
14444	digama0 author:digama0	fix(GeneralizeProofs): unreachable! bug	As [reported on Zulip](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/Unreachable.20code.20reached.20in.20Lean.204.2E8.2E0/near/449286780). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	1/1	Mathlib/Tactic/GeneralizeProofs.lean	1	4	['github-actions', 'jcommelin', 'kmill']	nobody	429-66285 1 year ago	445-17455 1 year ago	10-36842 10 days
14345	digama0 author:digama0	feat: the Dialectica category is monoidal closed	- [x] depends on: #14274 The monoidal closed structure of the Dialectica category. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	252/0	Mathlib.lean,Mathlib/CategoryTheory/Dialectica/Closed.lean	2	3	['github-actions', 'kim-em', 'leanprover-community-mathlib4-bot']	nobody	429-66285 1 year ago	445-34289 1 year ago	12-17890 12 days
12952	adomani author:adomani	test: length statistics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	test-ci WIP	124/0	.github/workflows/mathlib_stats.yml,.github/workflows/ml_stats_label.yaml,scripts/mathlib_stats.sh	3	9	['github-actions']	nobody	429-66284 1 year ago	458-38964 1 year ago	0-0 0 seconds
12984	adomani author:adomani	Adomani/periodic reports dev custom action	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	test-ci WIP	366/0	.github/workflows/mathlib_stats.yml,.github/workflows/ml_stats_label.yaml,scripts/count_decls.lean,scripts/mathlib_stats.sh	4	n/a	['github-actions']	nobody	429-66283 1 year ago	unknown	unknown
12452	JADekker author:JADekker	feat(Cocardinal) : add some more api	Just a small PR to add a bit more API for cocardinal filters. Not everything seems to generalise nicely from cofinite, so I didn't include such results. Currently the file has one `sorry`, I'm not sure how to complete this proof. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-CI	75/0	Mathlib/Order/Filter/Cocardinal.lean	1	0	[]	nobody	429-66283 1 year ago	451-46983 1 year ago	0-0 0 seconds
11991	adomani author:adomani	draft: syntax data linter	A linter that prints `SyntaxNodeKind`s and `Range`s for all the nodes of a command. See this [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/undocumented.20things). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	152/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SyntaxDataLinter.lean	3	0	[]	nobody	429-66282 1 year ago	458-38957 1 year ago	0-0 0 seconds
10998	hmonroe author:hmonroe	feat(Logic): Arithmetization of partial recursive functions (toward Gödel's first incompleteness theorem)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic awaiting-author	364/0	Mathlib.lean,Mathlib/Logic/Godel/PartArith.lean	2	3	['Ruben-VandeVelde', 'YaelDillies']	nobody	429-66281 1 year ago	484-37517 1 year ago	97-20483 97 days
10099	mcdoll author:mcdoll	feat: Integration by parts for higher dimensional spaces	--- - [x] depends on: #9987 - [x] depends on: #10105 - [x] depends on: #10107 - [x] depends on: #10115 - [x] depends on: #10118 - [x] depends on: #10182 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability t-analysis WIP	429/0	Mathlib/Analysis/InnerProductSpace/OrthoDecomp.lean,Mathlib/MeasureTheory/Integral/test2.lean	2	3	['alexjbest', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	429-66281 1 year ago	603-10298 1 year ago	0-0 0 seconds
9469	dupuisf author:dupuisf	feat: maximum modulus principle for functions vanishing at infinity	This PR adds versions of the maximum modulus principle for functions vanishing at infinity that parallel those we already had for functions over a bounded set. These will have applications in e.g. norm interpolation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	71/0	Mathlib/Analysis/Complex/AbsMax.lean	1	8	['dupuisf', 'j-loreaux']	nobody	429-66280 1 year ago	624-21126 1 year ago	12-86009 12 days
9352	chenyili0818 author:chenyili0818	feat: arithmetic lemmas for `gradient`	This file is based on Mathlib.Analysis.Calculus.Gradient.Basic, and describes the calculation properties Co-authored-by: Ziyu Wang [tropicalfish910@gmail.com](mailto:tropicalfish910@gmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	404/0	Mathlib.lean,Mathlib/Analysis/Calculus/Gradient/Lemmas.lean	2	30	['chenyili0818', 'github-actions', 'jcommelin', 'sgouezel', 'winstonyin']	nobody	429-66280 1 year ago	591-47445 1 year ago	51-80670 51 days
9510	eric-wieser author:eric-wieser	feat(Analysis/Calculus/DualNumber): Extending differentiable functions to dual numbers	This shows that this operation preserves multiplication and composition --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis awaiting-CI WIP label:t-algebra$	119/0	Mathlib/Analysis/Calculus/DualNumber.lean	1	4	['github-actions']	nobody	429-66280 1 year ago	635-54311 1 year ago	0-0 0 seconds
6859	MohanadAhmed author:MohanadAhmed	TryLean4Bundle: Windows Bundle Creator	# `TryLean4Bundle`: Windows Bundle Creator A Windows batch script and a CI yml file that create an self extracting archive. The user should 1. just download the archive, 2. double click the archive to expand 3. double click the `RunLean.bat` script in the expanded archive. The script currently downloads 7 dependencies into CI then unpacks them in the appropriate locations and finally packs them back. To try a bundle created using these scripts but from a different repo see (https://github.com/MohanadAhmed/TryLean4Bundle/releases) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI WIP help-wanted	114/0	.github/workflows/mk_windows_bundle.yml,scripts/windowsBundle.bat	2	0	[]	nobody	429-66279 1 year ago	766-9150 2 years ago	0-0 0 seconds
8224	Kha author:Kha	chore: add `lean4checker` benchmark		WIP	16/0	scripts/bench/temci-config.run.yml	1	3	['Kha', 'grunweg', 'kim-em', 'leanprover-bot']	nobody	429-66279 1 year ago	497-32808 1 year ago	0-0 0 seconds
7890	grhkm21 author:grhkm21	feat(Mathlib/Tactic/Setm): implement setm tactic	This is my first time doing metaprogramming in Lean 4, please provide feedback when you have them :) The `setm` tactic, which stands for `set` + matching, matches a given expression with the goal and introduces new local hypotheses for the named holes specified. One of the best usage is for rearrangement proofs. As a simple example, ```lean example : (1 + 1) + (4 * 3) - (1 + 1) = (3 * 4 : Rat) := by setm ?A + ?B - ?A = (?C : Rat) rw [show ∀ A B, A + B - A = B by intro A B ; ring_nf ] apply Rat.mul_comm ``` One can imagine replacing the three term expression with a 7 term algebraic expression. This was developed with tons of help from [Zulip](https://leanprover.zulipchat.com/#narrow/stream/239415-metaprogramming-.2F-tactics/topic/Help.20with.20writing.20tactic), especially from Thomas. Thanks! TODO: - [X] Support `setm ... at ...` syntax, see example 1 below - [X] Write docs - [ ] Use `withNewMCtxDepth` - [X] Rename the intermediate `MVar`s, see example 2 below - [ ] Use `elabTermWithHolesPostponing` in conjunction with `Term.synthesizeSyntheticMVarsNoPostPoning` after `isDefEq` to handle instances Example 1: ```lean /- Usage with `using` and `at` keywords -/ example (h1 : 1 + 1 = 3) (h2 : 1 + 3 = 5) (h3 : 2 + 2 = 5) : true := by setm ?A + _ = (?B : Nat) using h2 at h1 h2 h3 guard_hyp A := 1 guard_hyp B := 5 guard_hyp h1 : A + A = 3 guard_hyp h2 : A + 3 = B guard_hyp h3 : 2 + 2 = B trivial ``` Example 2: ```lean /- Test reusing named holes -/ example (h : b + a = c) : a + b = c := by /- setm 1-/ setm ?A + ?B = (_ : Nat) guard_hyp A := a guard_hyp B := b /- clean up -/ unfold_let A B clear hA hB A B /- setm 2 -/ rewrite [Nat.add_comm] setm ?A + ?B = (_ : Nat) at h ⊢ guard_hyp A := b guard_hyp B := a exact h ``` Co-authored-by: Jireh Loreaux [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	141/0	Mathlib.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/Setm.lean,test/Setm.lean	4	3	['thorimur']	nobody	429-66279 1 year ago	710-67803 1 year ago	0-0 0 seconds
5745	alexjbest author:alexjbest	feat: a tactic to consume type annotations, and make constructor nicer	During the copenhagen masterclass I found some situations where applying the constructor tactic left the goal in a difficult to read state when autoParams were present. We add a simple tactic to clean these up, and a macro for `constructor` to behave more like the constructor notation and do this automatically (constructor is in core) It seems that these things should be cleaned up by simp, but a simp lemma to remove these annotations is not accepted by lean as the types are too similar. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	41/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Consume.lean,test/consume.lean	4	4	['alexjbest', 'digama0', 'kim-em', 'kmill']	nobody	429-66278 1 year ago	514-29772 1 year ago	51-33797 51 days
4786	thorimur author:thorimur	feat: AppBuilder utils	This supplements `Lean.Meta.AppBuilder`, introducing variants of `mkAppN` and `mkAppM` which allow for more fine-grained management of existing and created metavariables. [Description pending] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	205/0	Mathlib.lean,Mathlib/Lean/Meta/AppBuilder.lean	2	0	[]	nobody	429-66278 1 year ago	849-66632 2 years ago	0-0 0 seconds
15224	AnthonyBordg author:AnthonyBordg	feat(CategoryTheory/Sites): covering families and their associated Grothendieck topology	Define covering families on a category and their associated Grothendieck topology by using the API for `Coverage`. Give an explicit characterization of the covering sieves of the said topology. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	112/0	Mathlib.lean,Mathlib/CategoryTheory/Sites/CoveringFamilies.lean	2	20	['AnthonyBordg', 'adamtopaz', 'dagurtomas', 'github-actions', 'joelriou']	nobody	424-41295 1 year ago	429-34960 1 year ago	1-48443 1 day
15453	tomaz1502 author:tomaz1502	Track formalization of runtime complexity	I finished porting https://github.com/leanprover-community/mathlib3/pull/14494/ to Lean 4 and made several small PRs, as suggested. This meta PR is used to track the progress of the smaller PRs. ## Pending PRs - [Formalization of List.insertionSort](https://github.com/leanprover-community/mathlib4/pull/15449) - [Lemmas about Split](https://github.com/leanprover-community/mathlib4/pull/15450) - [Formalization of List.merge](https://github.com/leanprover-community/mathlib4/pull/15451) - [Formalization of List.mergeSort](https://github.com/leanprover-community/mathlib4/pull/15452) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		525/0	Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean,Mathlib/Computability/Timed/MergeSort.lean,Mathlib/Computability/Timed/Split.lean	5	4	['joneugster', 'mergify']	nobody	415-60563 1 year ago	415-60617 1 year ago	0-0 0 seconds
14563	awueth author:awueth	feat: if-then-else of exclusive or statement	--- If `¬(P ∧ Q)` then `ite (P ∨ Q) a 1 = (ite P a 1) * (ite Q a 1)` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	5/0	Mathlib/Algebra/Group/Basic.lean	1	3	['eric-wieser', 'github-actions', 'kim-em']	nobody	414-58671 1 year ago	414-58671 1 year ago	6-38745 6 days
10387	adomani author:adomani	feat(Tactic/ComputeDegree): add `polynomial` tactic	Introducing the `polynomial` tactic, summing up `compute_degree, monicity` and adding support for `leadingCoeff`. This is more of a proof of concept: if there is interest in this tactic, I can polish it up. See [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Compute.20roots.20of.20polynomials/near/420713624). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	RFC t-meta WIP	24/0	Mathlib/Tactic/ComputeDegree.lean	1	0	[]	nobody	414-55819 1 year ago	414-55819 1 year ago	0-0 0 seconds
9693	madvorak author:madvorak	feat: Linear programming in the standard form	--- Zulip discussion: https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.237386.20Linear.20Programming Four PRs incompatible with each other: https://github.com/leanprover-community/mathlib4/pull/7386 (list of constraints) https://github.com/leanprover-community/mathlib4/pull/9693 (matrix form) https://github.com/leanprover-community/mathlib4/pull/10026 (Antoine Chambert-Loir's def; semirings, linear) https://github.com/leanprover-community/mathlib4/pull/10159 (Antoine Chambert-Loir's def; rings, affine) - [x] depends on: #9652 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC WIP label:t-algebra$	86/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/LinearProgramming.lean	2	14	['apurvanakade', 'github-actions', 'leanprover-community-mathlib4-bot', 'madvorak']	nobody	414-55734 1 year ago	414-55734 1 year ago	0-0 0 seconds
7386	madvorak author:madvorak	feat: Define linear programs	Linear programs over a general `Module` with constraints given in the form "aᵀx - b ≥ 0" and the objective function as an `AffineMap` to be minimized. --- Zulip discussion: https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.237386.20Linear.20Programming Four PRs incompatible with each other: https://github.com/leanprover-community/mathlib4/pull/7386 (list of constraints) https://github.com/leanprover-community/mathlib4/pull/9693 (matrix form) https://github.com/leanprover-community/mathlib4/pull/10026 (Antoine Chambert-Loir's def; semirings, linear) https://github.com/leanprover-community/mathlib4/pull/10159 (Antoine Chambert-Loir's def; rings, affine) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC WIP label:t-algebra$	87/0	Mathlib.lean,Mathlib/LinearAlgebra/LinearProgramming.lean	2	63	['Shreyas4991', 'YaelDillies', 'eric-wieser', 'github-actions', 'kim-em', 'madvorak']	nobody	414-55344 1 year ago	414-55344 1 year ago	66-6720 66 days
7219	Ruben-VandeVelde author:Ruben-VandeVelde	feat: Equivs for AddMonoidAlgebras	--- Extracted from #6718. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	113/0	Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/Equiv.lean	2	12	['Ruben-VandeVelde', 'alreadydone', 'eric-wieser']	eric-wieser assignee:eric-wieser	414-55306 1 year ago	414-55307 1 year ago	0-0 0 seconds
13163	erdOne author:erdOne	feat(.vscode/module-docstring.code-snippet): Prevent auto-complete from firing on `do`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	5/0	.vscode/module-docstring.code-snippets	1	5	['erdOne', 'grunweg', 'robertylewis', 'trivial1711']	nobody	414-54133 1 year ago	414-54133 1 year ago	50-50444 50 days
10026	madvorak author:madvorak	Linear programming according to Antoine Chambert-Loir's book	--- Zulip discussion: https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.237386.20Linear.20Programming Four PRs incompatible with each other: https://github.com/leanprover-community/mathlib4/pull/7386 (list of constraints) https://github.com/leanprover-community/mathlib4/pull/9693 (matrix form) https://github.com/leanprover-community/mathlib4/pull/10026 (Antoine Chambert-Loir's def; semirings, linear) https://github.com/leanprover-community/mathlib4/pull/10159 (Antoine Chambert-Loir's def; rings, affine) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC WIP label:t-algebra$	86/0	Mathlib.lean,Mathlib/LinearAlgebra/LinearProgramming.lean	2	9	['eric-wieser', 'madvorak', 'riccardobrasca']	nobody	413-33197 1 year ago	413-33197 1 year ago	0-0 0 seconds
10159	madvorak author:madvorak	Linear programming according to Antoine Chambert-Loir's book — affine version	--- Zulip discussion: https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.237386.20Linear.20Programming Four PRs incompatible with each other: https://github.com/leanprover-community/mathlib4/pull/7386 (list of constraints) https://github.com/leanprover-community/mathlib4/pull/9693 (matrix form) https://github.com/leanprover-community/mathlib4/pull/10026 (Antoine Chambert-Loir's def; semirings, linear) https://github.com/leanprover-community/mathlib4/pull/10159 (Antoine Chambert-Loir's def; rings, affine) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC WIP label:t-algebra$	83/0	Mathlib.lean,Mathlib/LinearAlgebra/LinearProgramming.lean	2	7	['eric-wieser', 'madvorak', 'riccardobrasca']	nobody	413-33183 1 year ago	413-33183 1 year ago	0-0 0 seconds
11890	adomani author:adomani	feat: the terminal refine linter	A linter that warns on usages of `refine` and `refine'` as a finishing tactic. See this [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Usage.20of.20refine'). ### Conclusion of the experiment Systematic replacements of terminal `refine` with `exact` leads to an overall slow-down. --- - [ ] depends on: #15616 (disable the linter in downstream projects) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter awaiting-author	77/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TerminalRefineLinter.lean	3	14	['adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	410-66764 1 year ago	410-66766 1 year ago	18-13508 18 days
11090	pangelinos author:pangelinos	feat: define spectral spaces and prove that a quasi-compact open of a spectral space is spectral	Define spectral spaces and prove that a quasi-compact open of a spectral space is spectral. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology please-adopt good first issue	69/0	Topology/Spectral/basic.lean	1	15	['YaelDillies', 'adomani', 'j-loreaux', 'jcommelin', 'kim-em', 'pangelinos']	nobody	410-42923 1 year ago	414-55849 1 year ago	16-44803 16 days
9795	sinhp author:sinhp	feat: the type `Fib` of fibre of a function at a point	This is the most basic file of the theory of fibred categories developed here: https://github.com/sinhp/LeanFibredCategories/tree/master --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	74/0	Mathlib.lean,Mathlib/Data/Fiber.lean	2	17	['adri326', 'joelriou', 'sinhp']	nobody	408-45699 1 year ago	623-65166 1 year ago	1-32924 1 day
15055	sinhp author:sinhp	feat: the category of pointed objects of a concrete category	This file defines the category of pointed objects of a concrete category. After this we will have the categories of pointed groups, pointed abelian groups, pointed groupoids, etc. To define `Pointed.functor`, we need to add the following "pullback" construction to the category of elements. ``` @[simps obj map] def pullback (F : D ⥤ Type w) (G : C ⥤ D) : (G ⋙ F).Elements ⥤ F.Elements where obj X := ⟨G.obj X.1, X.2⟩ map {X Y} f := ⟨G.map f.1, f.2⟩ ``` This is called pullback since the display map of `G ⋙ F` (i.e. `π (G ⋙ F)`) is a pullback of the display map of `F`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	185/0	Mathlib.lean,Mathlib/CategoryTheory/ConcreteCategory/Pointed.lean,Mathlib/CategoryTheory/Elements.lean	3	13	['dagurtomas', 'github-actions', 'kim-em']	nobody	407-53416 1 year ago	429-54072 1 year ago	7-80557 7 days
16253	Shreyas4991 author:Shreyas4991	feat: Basics of Discrete Fair Division in Mathlib	This PR adds the basics of discrete fair division in mathlib. We include the definitions of allocations, valuations, properties of valuations, and the following notions : Envy-Freeness (EF), Envy-Freeness upto 1 good (EF1), and envy freeness upto any good (EFX). We also include the various implications between these notions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author WIP	144/0	Mathlib/GameTheory/FairDivision/Discrete/Basic.lean	1	9	['Shreyas4991', 'eric-wieser', 'github-actions']	nobody	400-25465 1 year ago	400-25465 1 year ago	0-20853 5 hours
14669	Command-Master author:Command-Master	feat(Data/Nat/PartENat): add lemmas for PartENat	Add some missing lemmas for `PartENat`, as well as the additive homomorphism from it to `WithTop Int`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	90/0	Mathlib/Data/Nat/PartENat.lean	1	3	['erdOne', 'github-actions', 'urkud']	nobody	397-55470 1 year ago	397-55470 1 year ago	0-0 0 seconds
15121	Eloitor author:Eloitor	feat: iff theorems for IsSplitEpi and IsSplitMono in opposite category	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	40/0	Mathlib/CategoryTheory/EpiMono.lean	1	3	['github-actions', 'joelriou', 'mattrobball']	nobody	397-18415 1 year ago	428-64074 1 year ago	7-3203 7 days
15895	madvorak author:madvorak	feat(Computability/ContextFreeGrammar): mapping between two types of nonterminal symbols	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability WIP	172/0	Mathlib/Computability/ContextFreeGrammar.lean	1	43	['YaelDillies', 'github-actions', 'madvorak']	nobody	396-35208 1 year ago	400-68717 1 year ago	1-43047 1 day
16570	yuma-mizuno author:yuma-mizuno	chore(Tactic/CategoryTheory): change `TermElabM` to `MetaM`	Separated from #15335. To use `Qq`, we need to modify `Qq` to support universe matching. See [Zulip](https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.2315335.20meta.20code.20for.20monoidal.20categories). --- - [ ] depends on: #15335 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta WIP	26/15	Mathlib/Tactic/CategoryTheory/BicategoryCoherence.lean,Mathlib/Tactic/CategoryTheory/Coherence.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	389-42074 1 year ago	390-922 1 year ago	0-0 0 seconds
10591	adri326 author:adri326	feat(Topology/Algebra/ConstMulAction): properties of continuous actions in Hausdorff spaces	Defines some useful properties of `ContinuousConstSMul` group actions on Hausdorff spaces: - `MulAction.isClosed_fixedBy`, which proves that the `fixedBy α m` set is closed - `t2_separation_smul`, which constructs an open set `s` such that `s` and `g • s` are disjoint - `Set.InjOn.t2_separation_smul`, the extension of `t2_separation_smul` to a set of group elements whose action is injective --- This PR belongs my series of PR around the formalization of Rubin's theorem. `MulAction.isClosed_fixedBy` is used in several places along the proof, and the separation lemmas are primarily used in showing that `(fixedBy α g)ᶜ` and `(fixedBy α h)ᶜ` are disjoint under some intricate but fully group-theoretic condition. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology awaiting-author label:t-algebra$	57/0	Mathlib/Topology/Algebra/ConstMulAction.lean	1	9	['ADedecker', 'adri326', 'j-loreaux', 'jcommelin']	ADedecker assignee:ADedecker	388-34066 1 year ago	540-46804 1 year ago	55-82183 55 days
14704	Command-Master author:Command-Master	feat(FieldTheory): define typeclass for simple extensions, and prove some properties	Define `SimpleExtension F K`, which says that `K` is a simple field extension of `F`, and show that together with transcendentality it implies `IsFractionRing F[X] K`. --- - [x] depends on: #14710 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author WIP label:t-algebra$	120/0	Mathlib.lean,Mathlib/FieldTheory/SimpleExtension.lean	2	17	['Command-Master', 'acmepjz', 'github-actions', 'leanprover-community-mathlib4-bot', 'tb65536']	nobody	383-61516 1 year ago	383-61516 1 year ago	0-0 0 seconds
16773	arulandu author:arulandu	feat(Probability/Distributions): formalize Beta distribution	Formalize Beta distribution, using Gamma distribution as a reference. Added real-valued beta wrapper, in the manner of gamma. Thanks to @EtienneC30 for help with casting real <-> complex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	286/1	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Probability/Distributions/Beta.lean	3	48	['EtienneC30', 'arulandu', 'github-actions', 'vihdzp']	arulandu assignee:arulandu	378-65032 1 year ago	383-61750 1 year ago	1-21124 1 day
10796	mcdoll author:mcdoll	feat(Tactic/Positivity): non-negativity of functions	--- This makes the `Finset.sum` and `integral_nonneg` extensions even more useful. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta WIP	27/0	Mathlib/Tactic/Positivity/Core.lean	1	1	['YaelDillies']	nobody	348-65447 11 months ago	590-57516 1 year ago	0-0 0 seconds
14603	awueth author:awueth	feat: degree is invariant under graph isomorphism	--- Mathlib has the definition `SimpleGraph.Iso.mapNeighborSet` which is an equivalence between neighbor sets induced by an isomorphism. Would it be beneficial to add the same equivalence for `neighborFinset`? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics WIP	24/0	Mathlib/Combinatorics/SimpleGraph/Map/Finite.lean	1	11	['awueth', 'github-actions', 'jcommelin', 'kim-em', 'urkud']	nobody	346-37417 11 months ago	346-37417 11 months ago	31-44440 31 days
18630	tomaz1502 author:tomaz1502	feat(Computability.Timed): Formalization of runtime complexity of List.mergeSort	This PR adds the formalization of the runtime complexity of the merge sort algorithm, defined in `Data/List/Sort`. Requires: https://github.com/leanprover-community/mathlib4/pull/15451 References: - Previous PR on mathlib3: https://github.com/leanprover-community/mathlib3/pull/14494/ - First discussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/BSc.20Final.20Project/near/220647062 - Second disussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Formalization.20of.20Runtime.20Complexity.20of.20Sorting.20Algorithms/near/284184450 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	526/0	Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean,Mathlib/Computability/Timed/MergeSort.lean,Mathlib/Computability/Timed/Split.lean	5	8	['github-actions']	nobody	332-33976 10 months ago	332-33976 10 months ago	0-0 0 seconds
19329	adomani author:adomani	perf(CI): automatically benchmark PRs when they are opened	This action posts the comment ``` !bench This is an automated bench-marking that runs when a PR is opened. No need to repeat. ``` whenever a PR is opened. It then ignores any subsequent changes to the PR. The automatic benching should help in catching PRs that unknowingly introduce a high performance cost, as was the case for my PR #18033. ### Note. Running `!bench` strains the benchmarking system and it is not feasible to run it on every push. However, Sebastian, in private communication with Johan, approved of automatically benching every PR once, when it is opened. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI WIP	25/0	.github/workflows/first_bench_is_free.yml	1	12	['Ruben-VandeVelde', 'adomani', 'alreadydone', 'eric-wieser', 'github-actions', 'grunweg', 'jcommelin']	nobody	314-69470 10 months ago	316-58425 10 months ago	0-1356 22 minutes
19721	urkud author:urkud	feat (WIP): formalize Moreira's version of Sard's theorem	--- I'm in the process of migrating development to https://github.com/urkud/SardMoreira [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	427/1	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/Moreira2001.lean	5	1	['github-actions']	nobody	288-8150 9 months ago	293-4965 9 months ago	0-0 0 seconds
18236	joelriou author:joelriou	feat(Algebra/Category/ModuleCat/Presheaf): the endofunctor of presheaves of modules induced by an oplax natural transformation	An endomorphism of ` ModuleCat.restrictScalarsPseudofunctor`, i.e. a "compatible" family of functors `ModuleCat A ⥤ ModuleCat A` for all (commutative) rings `A` induces a functor `PresheafOfModules R ⥤ PresheafOfModules R` for any presheaf of (commutative) rings `R`. In #18262, this is applied to the construction of exterior powers of a presheaves of modules. --- - [x] depends on: #18197 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-category-theory WIP label:t-algebra$	180/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/FunctorOfNatTrans.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	287-30601 9 months ago	287-30639 9 months ago	0-0 0 seconds
20459	Ruben-VandeVelde author:Ruben-VandeVelde	chore: fix names of roots_C_mul_X_{add,sub}_C_of_IsUnit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	11/5	Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Roots.lean	2	2	['eric-wieser', 'github-actions']	nobody	268-35503 8 months ago	268-35503 8 months ago	4-64422 4 days
10977	grunweg author:grunweg	feat: germs of smooth functions	Define the space of germs of smooth functions (between manifolds). Endow it with a ring structure if the target manifold is a smooth ring (e.g., a Lie group or a field). From the sphere eversion project, rewritten by me. Co-authored-by: Patrick Massot ------- Particular questions for review - is the authorship/copyright information appropriate? (`PatrickMassot` created the file `SmoothGerm` which I adapted; I didn't trace this far back through sphere-eversion.) - is providing all the intermediate algebraic structures (such as, an additive subgroup) on the space of smooth germs useful in practice? (The sphere eversion project only needs a ring structure.) - any further particular API lemmas (e.g., around coercions) which would be good to add? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis t-topology t-differential-geometry awaiting-author	150/0	Mathlib.lean,Mathlib/Geometry/Manifold/Algebra/SmoothGerm.lean	2	33	['YaelDillies', 'github-actions', 'grunweg', 'jcommelin', 'kim-em', 'mcdoll']	fpvandoorn assignee:fpvandoorn	268-23260 8 months ago	402-44625 1 year ago	144-63944 144 days
19378	adamtopaz author:adamtopaz	feat: Explanation widgets	This adds some simple widgets, wrapped in a tactic, term and command elaborator, for displaying markdown explanations in the infoview. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	101/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Widget/Explain.lean	3	8	['adamtopaz', 'eric-wieser', 'github-actions', 'joneugster', 'kmill']	nobody	265-39538 8 months ago	265-39538 8 months ago	49-80804 49 days
19323	madvorak author:madvorak	feat: Function to Sum decomposition	--- Discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Function.20to.20Sum.20decomposition	t-data WIP	50/0	Mathlib.lean,Mathlib/Data/Sum/Decompose.lean	2	2	['github-actions', 'madvorak']	nobody	263-46200 8 months ago	273-48798 9 months ago	43-18005 43 days
18461	hannahfechtner author:hannahfechtner	feat: left and right common multiples mixins	add mixins for left and right common multiples. These carry the data of what factors are used to create the common multiples --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	78/0	Mathlib/Algebra/Group/Defs.lean	1	13	['github-actions', 'hannahfechtner', 'jcommelin', 'kbuzzard', 'kim-em', 'trivial1711']	nobody	256-61952 8 months ago	256-61952 8 months ago	69-35596 69 days
20797	vbeffara author:vbeffara	feat(Topology/Covering): CM version of eq_of_comp_eq	Add equivalents of the lemmas `IsCoveringMap.eq_of_comp_eq` and `IsCoveringMap.const_of_comp_CM` for the case of bundled `ContinuousMap` parameters. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology easy awaiting-author	9/1	Mathlib/Topology/Covering.lean	1	4	['github-actions', 'ocfnash', 'vbeffara']	nobody	256-48717 8 months ago	257-49670 8 months ago	2-77310 2 days
17589	joelriou author:joelriou	feat(Algebra/ModuleCat/Presheaf): composition of pushforwards and pullbacks and compatibilites	The composition of two pullback functors on presheaves of modules `pullback φ ⋙ pullback ψ` identifies to the pullback of the composition. We show compatibilites for these isomorphisms: they are deduced from similar identifies for pushforward (in which case they are `rfl`). --- - [x] depends on: #17366 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-category-theory WIP	166/2	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pullback.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean	4	4	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	253-29383 8 months ago	253-29402 8 months ago	0-0 0 seconds
21009	vihdzp author:vihdzp	feat(Logic/Relation): more `TransGen` lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic t-order awaiting-author	13/0	Mathlib/Logic/Relation.lean	1	2	['b-mehta', 'github-actions']	nobody	252-44355 8 months ago	252-44355 8 months ago	0-39342 10 hours
15443	YaelDillies author:YaelDillies	feat: The Marcinkiewicz-Zygmund inequality	Prove the Marcinkiewicz-Zygmund inequality. The Marcinkiewicz-Zygmund inequality states that, if `X₁, ... Xₐ ∈ L^p` are independent random variables of mean zero valued in some inner product space, then the `L^p`-norm of `X₁ + ... + Xₐ` is at most `Cₚ` times the `L^(p/2)`-norm of `\|X₁\|² + ... + \|Xₐ\|²`, where `Cₚ` is a constant depending on `p` alone. From LeanAPAP Co-authored-by: Bhavik Mehta --- - [x] depends on: #15832 - [x] depends on: #21033 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP	189/0	Mathlib.lean,Mathlib/Probability/MarcinkiewiczZygmund.lean	2	39	['Parcly-Taxel', 'YaelDillies', 'b-mehta', 'github-actions', 'hrmacbeth', 'mathlib4-dependent-issues-bot', 'sgouezel']	nobody	251-62697 8 months ago	251-67761 8 months ago	89-28229 89 days
20466	MohanadAhmed author:MohanadAhmed	feat: Sherman Morrison formula for rank 1 update of the matrix inverse	Provides the Sherman Morrison rank 1 update of the matrix inverse https://en.wikipedia.org/wiki/Sherman%E2%80%93Morrison_formula. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	37/0	Mathlib/Data/Matrix/Invertible.lean	1	4	['eric-wieser', 'github-actions']	nobody	249-42220 8 months ago	249-42220 8 months ago	23-30991 23 days
18749	GabinKolly author:GabinKolly	feat(ModelTheory): preparatory work for the existence of Fraïsse limits	Define the map of a PartialEquiv through an embedding, and related properties. Define embeddings and equivalences between equal structures or equal substructures, and related properties. Add miscellaneous lemmas which will be used to prove the existence of fraisse limits. --- This is preparation for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic awaiting-author	308/5	Mathlib/ModelTheory/Bundled.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/FinitelyGenerated.lean,Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/ModelTheory/Substructures.lean	5	9	['GabinKolly', 'YaelDillies', 'github-actions', 'vihdzp']	nobody	246-18677 8 months ago	256-31131 8 months ago	73-63475 73 days
20649	GabinKolly author:GabinKolly	feat(ModelTheory/Graph): prove characterization of the fraisse limit of finite simple graphs	Prove that a countable graph with the extension property must be the Fraisse limit of finite simple graphs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-logic t-combinatorics WIP	175/0	Mathlib/ModelTheory/Graph.lean,Mathlib/ModelTheory/Substructures.lean	2	1	['github-actions']	nobody	244-14536 8 months ago	266-12177 8 months ago	0-0 0 seconds
21384	alreadydone author:alreadydone	experiment: make submodule quotient reducibly defeq to additive group quotient	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	1/1	Mathlib/LinearAlgebra/Quotient/Defs.lean	1	1	['github-actions']	nobody	242-33119 8 months ago	242-33122 8 months ago	0-0 0 seconds
10660	eric-wieser author:eric-wieser	feat(LinearAlgebra/CliffordAlgebra): construction from a basis	This is adapted from https://github.com/eric-wieser/lftcm2023-clifford_algebra, which only worked for the special case of `Q = 0`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author WIP label:t-algebra$	573/0	Mathlib.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basis.lean	2	15	['github-actions']	nobody	240-79157 7 months ago	240-79157 7 months ago	0-0 0 seconds
15355	adomani author:adomani	feat: MiM PR report	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	153/0	.github/workflows/monthly_pr_report.yaml,scripts/find_labels.sh	2	n/a	['YaelDillies', 'adomani', 'github-actions']	nobody	239-59079 7 months ago	unknown	unknown
21495	alreadydone author:alreadydone	experiment: reducible HasQuotient.quotient'	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	bench-after-CI WIP	2/0	Mathlib/Algebra/Quotient.lean	1	1	['github-actions']	nobody	239-53169 7 months ago	239-53169 7 months ago	0-200 3 minutes
21496	alreadydone author:alreadydone	experiment: make SetLike.coe reducible	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	bench-after-CI t-data	1/1	Mathlib/Data/SetLike/Basic.lean	1	1	['github-actions']	nobody	239-52938 7 months ago	239-52938 7 months ago	0-0 0 seconds
21447	erdOne author:erdOne	feat(AlgebraicGeometry): the split algebraic torus	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry awaiting-author	419/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Torus.lean	2	4	['erdOne', 'github-actions', 'joelriou']	nobody	237-86343 7 months ago	238-18117 7 months ago	2-69252 2 days
22037	EtienneC30 author:EtienneC30	issues with Finset subtype coercion	[Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Finset.20subtype.20changes) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	7/1	Mathlib/Data/Finset/Defs.lean,Mathlib/MeasureTheory/Constructions/Projective.lean	2	1	['github-actions']	nobody	227-57966 7 months ago	227-58018 7 months ago	0-0 0 seconds
13442	dignissimus author:dignissimus	feat: mabel tactic for multiplicative abelian groups	Mabel tactic for multiplicative abelian groups (#10361) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta modifies-tactic-syntax awaiting-author help-wanted	439/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MAbel.lean,MathlibTest/mabel.lean	4	10	['BoltonBailey', 'dignissimus', 'github-actions', 'joneugster', 'kbuzzard']	joneugster assignee:joneugster	226-14480 7 months ago	230-82476 7 months ago	0-16 16 seconds
21501	sksgurdldi author:sksgurdldi	feat(List): add sum_zipWith_eq_finset_sum	### Description: This PR adds the lemma `List.sum_zipWith_eq_finset_sum` to `Mathlib.Algebra.BigOperators.Group.Finset.Basic`. #### Statement: The sum of the `zipWith` operation on two lists equals the sum of applying the operation to corresponding elements of the two lists, indexed over the minimum of their lengths. #### Formal Statement: ```lean lemma sum_zipWith_eq_finset_sum [Inhabited α] [Inhabited β] [AddCommMonoid γ] {op : α → β → γ} (l : List α) (m : List β) : (List.zipWith op l m).sum = ∑ x ∈ (Finset.range (Nat.min l.length m.length)), op (l[x]!) (m[x]!) ``` #### Remarks: - This lemma provides a useful equivalence between `List.zipWith` and summation over a `Finset.range` indexed by `Nat.min l.length m.length`. - It can be helpful in algebraic manipulations involving list-based summations. #### Dependencies: No additional dependencies. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	43/0	Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean	1	1	['github-actions', 'j-loreaux']	nobody	226-13559 7 months ago	226-13559 7 months ago	13-33168 13 days
22194	eric-wieser author:eric-wieser	feat: oracle computations (alternative)	This explores a simpler version of #20924 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability	698/0	Archive/Examples/SumOracle.lean,Mathlib.lean,Mathlib/Computability/QueryComplexity/Defs.lean,Mathlib/Computability/QueryComplexity/Sort.lean	4	4	['eric-wieser', 'girving', 'github-actions']	nobody	222-54816 7 months ago	223-9304 7 months ago	0-0 0 seconds
19062	hannahfechtner author:hannahfechtner	feat(Algebra/PresentedMonoid/Basic) : facts about rel	Add in a number of useful theorems (reflexivity, closure under multiplication) and lemmas about when the PresentedMonoid.rel holds as an API for users --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	38/0	Mathlib/GroupTheory/Congruence/Defs.lean	1	8	['github-actions', 'hannahfechtner', 'kbuzzard', 'riccardobrasca']	nobody	220-51128 7 months ago	220-51128 7 months ago	87-64575 87 days
22302	CharredLee author:CharredLee	feat: add `CategoryTheory.Topos.Power`	This is a continuation of #21281 with the end goal of defining topoi in Mathlib. It introduces the notion of a power object in a category with a subobject classifier, which is a special case of an internal hom. The definition `HasPowerObjects C` contained in this PR is all that remains before `IsTopos C` can be defined. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	312/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Power.lean	2	2	['github-actions', 'joelriou']	b-mehta assignee:b-mehta	220-14755 7 months ago	220-15882 7 months ago	0-1528 25 minutes
22416	JLimperg author:JLimperg	chore: fix benchmark script for precompilation	The benchmarking script used to fail when precompilation was enabled anywhere in the dependency graph. --- Fix courtesy of @Kha. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		2/0	scripts/bench/fake-root/lib/lean/libleanshared.so,scripts/bench/run	2	1	['github-actions']	nobody	217-10810 7 months ago	217-10873 7 months ago	0-0 0 seconds
22389	adomani author:adomani	feat: the variableVariable linter	The motivation comes from [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/style.20proposal.3A.20avoid.20.60variable.20.7BX.7D.20.2E.2E.2E.20variable.20.28X.29.60). Summarising, updating a variable binder for a single declaration can be confusing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter WIP	167/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/VariableVariable.lean,variableDeclarationVariable_replacements.py	5	1	['github-actions']	nobody	215-38277 7 months ago	217-59433 7 months ago	0-0 0 seconds
22497	adomani author:adomani	test: decl diff in lean	Testing branch for #22464. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	test-ci CI WIP	161/0	.github/workflows/PR_summary_lean.yml,Mathlib.lean,Mathlib/Test.lean,scripts/README.md,scripts/declarations_diff.lean,scripts/declarations_diff_lean_shell_glue.sh	6	7	['github-actions', 'mergify']	nobody	213-37855 6 months ago	214-49554 7 months ago	0-0 0 seconds
20636	eric-wieser author:eric-wieser	feat: multiplication of intervals in rings	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	36/1	Mathlib/Algebra/Order/Interval/Basic.lean	1	16	['Timeroot', 'YaelDillies', 'eric-wieser', 'github-actions']	nobody	213-26476 6 months ago	249-30253 8 months ago	17-17852 17 days
22648	adomani author:adomani	test: lean implementation decl diff quandle	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		210/1	.github/workflows/PR_summary_lean.yml,Mathlib/Algebra/Quandle.lean,scripts/README.md,scripts/declarations_diff.lean,scripts/declarations_diff_lean_shell_glue.sh	5	4	['adomani', 'eric-wieser', 'github-actions']	nobody	209-68635 6 months ago	211-37921 6 months ago	0-0 0 seconds
22784	grunweg author:grunweg	feat: add Diffeomorph.sumSumSumComm	This matches `{Equiv,Homeomorph.sumSumSumComm}`, and is needed to prove that addition in the cobordism group is commutatives. From my bordism theory project. --- - depends on #22783 (easy pre-requisites) The current proof is not complete yet, and feels very painful. I'm not yet sure what's the best way to write this. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry WIP	50/0	Mathlib/Geometry/Manifold/Diffeomorph.lean	1	1	['github-actions']	nobody	207-22308 6 months ago	207-45052 6 months ago	0-0 0 seconds
22846	mattrobball author:mattrobball	test		t-analysis	2/0	Mathlib/Analysis/Normed/Module/Basic.lean	1	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	206-26816 6 months ago	206-28756 6 months ago	0-0 0 seconds
22159	shetzl author:shetzl	feat: add definition of pushdown automata	Add the definition of pushdown automata and their two acceptance conditions: acceptance based on empty stack and acceptance based on final state. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	70/0	Mathlib.lean,Mathlib/Computability/PDA.lean	2	34	['YaelDillies', 'github-actions', 'madvorak', 'shetzl']	nobody	200-62302 6 months ago	200-62302 6 months ago	20-81771 20 days
23042	joneugster author:joneugster	feat(CategoryTheory/Enriched/Limits): add HasConicalLimitsOfSize.shrink	--- Note: I've marked this "WIP" because I'm not yet sure when this will be needed and I'd probably put the PR on the queue once I've created some follow-up needing it. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos t-category-theory WIP	22/1	Mathlib/CategoryTheory/Enriched/Limits/HasConicalLimits.lean	1	1	['github-actions']	nobody	199-60414 6 months ago	199-60569 6 months ago	0-1 1 second
17587	kmill author:kmill	feat: Sym2-as-Finset theory	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	105/3	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/RingTheory/Polynomial/Vieta.lean	4	10	['FordUniver', 'YaelDillies', 'github-actions', 'kmill']	nobody	198-72827 6 months ago	199-21907 6 months ago	0-0 0 seconds
16239	Rida-Hamadani author:Rida-Hamadani	feat(Geometry/Manifold): orientable manifolds	This module defines orientable manifolds. [This](https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/Orientable.20Surface) Zulip topic is related. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry awaiting-author	376/6	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/Orientable.lean	3	39	['Rida-Hamadani', 'github-actions', 'grunweg', 'ocfnash']	nobody	197-9074 6 months ago	216-47796 7 months ago	5-70530 5 days
23142	joneugster author:joneugster	feat(CategoryTheory/Enriched/Limits): add API for HasConicalLimit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos t-category-theory awaiting-author	52/9	Mathlib/CategoryTheory/Enriched/Limits/HasConicalLimits.lean	1	2	['github-actions', 'joelriou']	nobody	196-63560 6 months ago	196-63560 6 months ago	0-68906 19 hours
23285	AntoineChambert-Loir author:AntoineChambert-Loir	refactor: directed systems in terms of functors	This is a WIP aiming to refactor the work on directed systems using the category theory library. But there are universes nightmares. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra t-category-theory WIP label:t-algebra$	111/45	Mathlib/Order/DirectedInverseSystem.lean	1	1	['github-actions']	nobody	193-13951 6 months ago	193-13957 6 months ago	0-24 24 seconds
21829	Whysoserioushah author:Whysoserioushah	feat(LinearAlgebra/TensorProduct/HomTensor): Add TensorProduct of Hom-modules	Co-authored-by: Andrew Yang --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	174/0	Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/HomTensor.lean	2	26	['Whysoserioushah', 'YaelDillies', 'erdOne', 'github-actions', 'kbuzzard']	nobody	184-56574 6 months ago	185-63094 6 months ago	46-53384 46 days
22861	eric-wieser author:eric-wieser	feat: add the trace of a bilinear form	Following the steps at [#Is there code for X? > Laplacian @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Laplacian/near/450834505). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Some questions: * Does this generalize to multilinear maps? * Is there an `RCLike` generalization? * Does this generalize to `BilinMap` instead of just `BilinForm`? Perhaps the approach in [#mathlib4 > Stating Schrodinger's equation @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Stating.20Schrodinger's.20equation/near/500409890) of using `ContinuousLinearMap.adjoint'` is better.	t-algebra awaiting-author label:t-algebra$	100/0	Mathlib.lean,Mathlib/LinearAlgebra/BilinearForm/Trace.lean	2	3	['github-actions', 'jcommelin']	nobody	182-46413 5 months ago	182-46413 5 months ago	23-44995 23 days
22888	plp127 author:plp127	perf: replace `Lean.Expr.swapBVars` with a better? implementation	Replaces `Lean.Expr.swapBVars` with a version that traverses the expression. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	14/12	Mathlib/Tactic/FunProp/ToBatteries.lean	1	23	['eric-wieser', 'github-actions', 'joneugster', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'plp127']	eric-wieser and joneugster assignee:eric-wieser assignee:joneugster	179-58659 5 months ago	180-44958 5 months ago	4-80306 4 days
23772	SEU-Prime author:SEU-Prime	Create Amice.lean	i built amice equiv [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory WIP	283/0	Mathlib/NumberTheory/Padics/Amice.lean	1	2	['grunweg']	nobody	179-45107 5 months ago	179-45107 5 months ago	0-8688 2 hours
21903	yhtq author:yhtq	feat: add from/toList between `FreeSemigroup` and `List` with relative theorems	Add from/toList between `FreeSemigroup` and `List` with relative theorems, as well as an incidental definition of lexicographic order on `FreeSemigroup`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra awaiting-CI label:t-algebra$	169/0	Mathlib/Algebra/Free.lean	1	11	['YaelDillies', 'github-actions']	nobody	178-77628 5 months ago	178-77628 5 months ago	51-9403 51 days
22657	Xmask19 author:Xmask19	feat: a graph is maximally acyclic iff it is a tree	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	86/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	6	['Rida-Hamadani', 'b-mehta', 'github-actions', 'grunweg']	b-mehta assignee:b-mehta	178-43285 5 months ago	178-43306 5 months ago	200-33970 200 days
21342	YaelDillies author:YaelDillies	refactor(Normed/Group/Quotient): generalise to non-abelian groups	The goal is to apply this to the free group. --- - [x] depends on: #21341 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP	25/12	Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Quotient.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	175-68870 5 months ago	175-68889 5 months ago	0-352 5 minutes
24000	YaelDillies author:YaelDillies	feat: correspondence between Hopf algebras and affine group schemes	Construct `Spec` as a functor from `R`-Hopf algebras to group schemes over `Spec R`, show it is full and faithful and has affine group schemes as essential image. From Toric, FLT Co-authored-by: Andrew Yang Co-authored-by: Michał Mrugała Co-authored-by: Christian Merten --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric FLT t-algebraic-geometry WIP	127/0	Mathlib/AlgebraicGeometry/GroupScheme/HopfAffine.lean	1	3	['YaelDillies', 'github-actions', 'kbuzzard']	nobody	173-13867 5 months ago	173-51819 5 months ago	0-1 1 second
21270	GabinKolly author:GabinKolly	feat(ModelTheory/Bundled): first-order embeddings and equivalences from equalities	Add first-order embeddings and equivalences from equalities between bundled structures. --- Add two definitions to get embeddings and equivalences from equalities between bundled structures, and simple properties. This is some preparatory work for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-logic awaiting-author	102/0	Mathlib/ModelTheory/Bundled.lean	1	26	['GabinKolly', 'Vierkantor', 'YaelDillies', 'github-actions']	nobody	172-70240 5 months ago	172-70240 5 months ago	50-58472 50 days
24086	mattrobball author:mattrobball	perf(Normed.Field.Basic): change parent order for `Semifield` and `Field` and reduce priority `toComm(Semi)Ring`	Passing through the projection `toComm(Semi)Ring` should not be preferred. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	8/2	Mathlib/Algebra/Field/Defs.lean	1	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	171-36877 5 months ago	171-41677 5 months ago	0-0 0 seconds
13038	adomani author:adomani	feat: Mathlib weekly reports	This PR introduces a weekly cron job that computes a "global" report on the evolution of Mathlib in the previous week. It consists of * a CI workflow with a cron job that runs at minight on Sunday (`.github/workflows/mathlib_stats.yaml`); * a Lean file extracting a categorized list of "all" the declarations in Mathlib (`scripts/count_decls.lean`); * a bash file computing Git-diff-related information and collating the data from the Lean file (`scripts/mathlib_stats.sh`); * a convenience CI workflow that is triggered on adding the `test-ci` label and results in posting on the PR and on Zulip the report (`.github/workflows/mathlib_stats_label.yaml`). The second CI workflow is intended to be removed just before/right after the PR is ready to merge. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/113488-general) [Thread for the reports](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Mathlib.20weekly.20change.20report) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI t-meta awaiting-author	338/0	.github/workflows/mathlib_stats.yaml,.github/workflows/mathlib_stats_label.yaml,scripts/count_decls.lean,scripts/mathlib_stats.sh	4	10	['adomani', 'github-actions', 'grunweg', 'kim-em', 'kmill']	nobody	171-17831 5 months ago	445-35711 1 year ago	57-4216 57 days
24129	urkud author:urkud	feat: symmetry of Gateaux derivatives	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	190/1	Mathlib.lean,Mathlib/Analysis/Calculus/LineDeriv/Basic.lean,Mathlib/Analysis/Calculus/LineDeriv/Symmetric.lean	3	1	['github-actions']	nobody	169-71458 5 months ago	169-71458 5 months ago	0-0 0 seconds
19613	madvorak author:madvorak	refactor(Combinatorics/Optimization/ValuedCSP): make only valid `FractionalOperation` possible	Originally `FractionalOperation` was any multiset (possible empty). Then `FractionalOperation.IsValid` said it was nonempty. Instead, I would like to make it nonempty by definition. As a result, empty/invalid fractional operation couldn't be declared at all. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	14/17	Mathlib/Combinatorics/Optimization/ValuedCSP.lean	1	1	['github-actions']	nobody	169-21275 5 months ago	298-42848 9 months ago	308-30480 308 days
23600	mattrobball author:mattrobball	perf(Quiver.Basic): make `IsThin` a `class`	It seems problematic that `Quiver.IsThin` is an `abbrev` for (essentially) `Subsingleton`. We turn it in a one-field class. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated	27/21	Mathlib/CategoryTheory/Bicategory/Coherence.lean,Mathlib/CategoryTheory/Category/Preorder.lean,Mathlib/CategoryTheory/Generator/Basic.lean,Mathlib/CategoryTheory/Groupoid/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/WidePullbacks.lean,Mathlib/CategoryTheory/Limits/SmallComplete.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean,Mathlib/CategoryTheory/Thin.lean,Mathlib/Combinatorics/Quiver/Basic.lean	11	16	['b-mehta', 'github-actions', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	168-38410 5 months ago	183-37214 6 months ago	0-5717 1 hour
24219	Paul-Lez author:Paul-Lez	feat: linear independence of the tensor product of two linearly independent families	This is still WIP (the proofs are a little too long, and some lemmas need to be moved to other files!) From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra WIP label:t-algebra$	193/0	Mathlib/LinearAlgebra/LinearIndependent/Tprod.lean	1	1	['github-actions']	nobody	164-40108 5 months ago	164-40108 5 months ago	0-2221 37 minutes
13740	YaelDillies author:YaelDillies	feat: More robust ae notation	Make sure that, when `μ : FiniteMeasure Ω`, `f =ᵐ[μ] g` elaborates to `f =ᵐ[↑μ] g` instead of complaining about `OuterMeasureClass (FiniteMeasure Ω) (Set Ω) ℝ≥0∞` not existing. [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/ae.20of.20a.20finite.20measure) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-CI t-meta	56/2	Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/OuterMeasure/AE.lean,Mathlib/MeasureTheory/OuterMeasure/BorelCantelli.lean	3	16	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'urkud']	nobody	163-64580 5 months ago	163-64595 5 months ago	0-0 0 seconds
24161	urkud author:urkud	feat(Analysis/Calculus/Schwarzian): new file	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	190/3	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/Schwarzian/Basic.lean	3	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	163-51434 5 months ago	163-51452 5 months ago	0-0 0 seconds
20652	jjaassoonn author:jjaassoonn	feat: categorical description of center of a ring	We show the isomorphism between `Z(R)` and `End(1 Mod-R)` --- - [x] depends on:#20721 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-category-theory awaiting-author label:t-algebra$	212/21	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/Ring/Center.lean,Mathlib/CategoryTheory/Conj.lean,Mathlib/CategoryTheory/Endomorphism.lean,Mathlib/CategoryTheory/Preadditive/AdditiveFunctor.lean,Mathlib/CategoryTheory/Preadditive/Basic.lean	7	41	['alreadydone', 'github-actions', 'jcommelin', 'jjaassoonn', 'kbuzzard', 'qawbecrdtey']	nobody	163-7546 5 months ago	220-59627 7 months ago	20-7596 20 days
21616	peabrainiac author:peabrainiac	feat(Topology): concatenating countably many paths	Adds `Path.countableConcat`, the concatenation of a sequence of paths leading up to some point `x`. --- - [x] depends on: #21591 - [x] depends on: #21607 This work is a prerequisite to #20248, where it is used to show that the topology of first-countable locally path-connected spaces is coinduced by all the paths in that space. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	229/0	Mathlib.lean,Mathlib/Topology/Path/CountableConcat.lean	2	30	['YaelDillies', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'peabrainiac']	YaelDillies assignee:YaelDillies	162-59869 5 months ago	166-67803 5 months ago	56-56728 56 days
18210	vihdzp author:vihdzp	feat(Order/Hom/Basic): `WithBot (Fin n) ≃o Fin (n + 1)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	16/0	Mathlib/Order/Hom/Basic.lean	1	8	['Command-Master', 'Ruben-VandeVelde', 'github-actions', 'urkud', 'vihdzp']	nobody	162-6177 5 months ago	333-10255 10 months ago	10-77913 10 days
23585	plp127 author:plp127	feat: `Filter.atMax` and `Filter.atMin`	Adds `atMax` and `atMin`, filters. Making an analogy, `atMax` : `atTop` :: `IsMax` : `IsTop`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order WIP	148/0	Mathlib.lean,Mathlib/Order/Filter/AtMaxMin.lean	2	4	['github-actions', 'plp127', 'urkud']	nobody	161-83386 5 months ago	184-58044 6 months ago	0-0 0 seconds
12032	mcdoll author:mcdoll	feat: Delta distribution as a limit	--- - [x] depends on: #11496 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP	51/0	Mathlib/Analysis/Distribution/DiracDelta.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	159-11781 5 months ago	unknown	unknown
18861	YaelDillies author:YaelDillies	refactor: make `Set.mem_graphOn` defeq	The definition as an image is cute but not very useful. Also unsimp `graphOn_univ` since the RHS contains `f` more times than the LHS does. --- Later, I would like to introduce `Set.graph` to have a `Set` version with good defeqs of `LinearMap.graph` and alike [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	72/18	Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean	4	4	['YaelDillies', 'b-mehta', 'github-actions']	nobody	153-72854 5 months ago	194-26163 6 months ago	2-24624 2 days
23503	apnelson1 author:apnelson1	feat(Topology/Instances/ENat): ENat and tsum	We give API for the interactions between `tsum` and `ENat`. The type is especially nice, because every function is summable, and there are simplifying lemmas like the statement that a sum is infinite iff either some term is infinite, or the support is infinite. This provides one of the missing pieces for working painlessly with discrete objects, 'propositional' finiteness and cardinality. For instance, one can sum a function `f : a -> ENat` over an arbitrary set with the term `∑' a : s, 1`, and it will be provable that `∑' a : s, 1 = s.encard` and `(support f).encard ≤ ∑' a, f a` without ever having to split into finite/infinite cases. As is pointed out in the module docstring for `Data.ENat`, there are strong analogies between `ENat` and `ENNReal`, and the API runs parallel to the API for `tsum`/`ENNReal`. One could call it 'duplication', but I have yet to find a common generalization of the two that saves work, or a third example of a natural type with these same properties. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology WIP	205/2	Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Set/Card.lean,Mathlib/Topology/Instances/ENat.lean	3	2	['eric-wieser', 'github-actions']	nobody	153-68735 5 months ago	153-68735 5 months ago	14-6036 14 days
22809	b-reinke author:b-reinke	feat: Category algebras and path algebras	This PR defines the category algebra of a linear category and path algebras of quivers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra t-category-theory WIP label:t-algebra$	218/0	Mathlib/Algebra/Ring/Assoc.lean,Mathlib/CategoryTheory/Linear/CategoryAlgebra.lean,Mathlib/Combinatorics/Quiver/PathAlgebra.lean,Mathlib/Data/DFinsupp/BigOperators.lean	4	2	['b-reinke', 'github-actions']	nobody	153-68699 5 months ago	153-68699 5 months ago	0-0 0 seconds
19797	eric-wieser author:eric-wieser	refactor: use Qq in the nlinarith preprocessor	This also provides the machinery needed to Qq-ify linarith itself. This is still doing far more `synthInstanceQ`/`isDefEq`(`Q`) than should be needed, but at least drops the `mkAppM`s. Currently, this takes a different approach to the one used by `NormNum.Result`: * `NormNum.Result` deliberately avoids adding any `Expr` parameters to types, as this makes defeq problem at compile-time hard * This PR allows the Expr parameters, but adds casting helpers to easily transport along defeq(Q)s. A few `unsafeIntro`s are left, which correspond to either a Qq bug, or a flaw in the idea behind this approach. I don't know if this pattern is an improvement. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta	260/28	Mathlib/Data/Ineq.lean,Mathlib/Tactic/Linarith/Datatypes.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm.lean,Mathlib/Tactic/Linarith/Preprocessing.lean,Mathlib/Util/Qq.lean	5	8	['eric-wieser', 'github-actions', 'leanprover-bot']	nobody	153-68421 5 months ago	153-68421 5 months ago	0-0 0 seconds
14348	eric-wieser author:eric-wieser	perf: disable the `unusedVariables` linter for speed	I doubt we want to merge this, but it shaves two minutes of the lint time. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	performance-hack	1/0	lakefile.lean	1	3	['eric-wieser', 'github-actions', 'leanprover-bot']	nobody	153-67729 5 months ago	153-67729 5 months ago	0-0 0 seconds
22488	smmercuri author:smmercuri	fix: lower priority for `UniformSpace.Completion.instSMul`	Following the introduction of the `WithVal` type synonym in #22055 the following instance takes a long time to synthesise in FLT, and times out in the default heartbeats ```lean import Mathlib namespace IsDedekindDomain.HeightOneSpectrum variable (A K : Type*) [CommRing A] [Field K] [Algebra A K] [IsFractionRing A K] [IsDedekindDomain A] (v : HeightOneSpectrum A) #synth SMul (v.adicCompletionIntegers K) (v.adicCompletion K) ``` The issue is that `UniformSpace.Completion.instSMul (v.adicCompletionIntegers K) (v.adicCompletion K)` now fires during the start of instance search (because we now have `UniformSpace (WithVal (v.valuation K))` whereas previously this would be `UniformSpace K`, which was not automatic), and this takes a long time to fail (leading to ~1400 entries in the trace). The first few lines of the new trace is ```lean [Meta.synthInstance] [5.512418] ✅️ SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▼ [] [0.000118] new goal SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000537] ✅️ apply UniformSpace.Completion.instSMul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.004411] ✅️ apply @WithVal.instSMul to SMul (↥(adicCompletionIntegers K v)) (WithVal (valuation K v)) ▶ [] [0.000765] ❌️ apply @GradedMonoid.GradeZero.smul to SMul (↥(adicCompletionIntegers K v)) K ▶ [] [0.000378] ✅️ apply @Algebra.toSMul to SMul (↥(adicCompletionIntegers K v)) K ▶ ... [] 1339 more entries... ▶ ``` Lowering the priority of `UniformSpace.Completion.instSMul` fixes this particular issue, leading to a trace that matches that seen prior to the introduction of `WithVal`: ```lean [Meta.synthInstance] [0.016405] ✅️ SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▼ [] [0.000119] new goal SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000491] ❌️ apply @GradedMonoid.GradeZero.smul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000403] ✅️ apply @Algebra.toSMul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000134] ❌️ apply inst✝⁴ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000093] ❌️ apply inst✝⁵ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000077] ❌️ apply inst✝⁷ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000082] ❌️ apply inst✝⁹ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000075] ❌️ apply inst✝¹² to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000220] ❌️ apply Algebra.id to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.001015] ✅️ apply @ValuationSubring.instAlgebraSubtypeMem to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [resume] [0.000038] propagating Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) to subgoal Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) of SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [check] [0.013358] ✅️ Algebra.toSMul [] result Algebra.toSMul ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-topology awaiting-author	1/1	Mathlib/Topology/Algebra/UniformMulAction.lean	1	10	['github-actions', 'leanprover-bot', 'smmercuri', 'urkud']	nobody	152-51513 4 months ago	158-80065 5 months ago	55-70108 55 days
15161	adomani author:adomani	feat(Linter): flag `intros x y` which can be replaced by `intro x y`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter WIP	78/1	Mathlib/Tactic/Linter/Lint.lean,test/Lint.lean	2	4	['adomani', 'github-actions', 'grunweg']	nobody	152-22581 4 months ago	152-57195 4 months ago	0-0 0 seconds
15649	TpmKranz author:TpmKranz	feat(Computability): introduce Generalised NFA as bridge to Regular Expression	Lays the groundwork for a proof of equivalence of NFA and RE, w.r.t. described language. Actual connection to NFA comes later, after the groundwork for the opposite direction has been laid. Second chunk of #12648 --- - [x] depends on: #15647 [Data.FinEnum.Option unchanged since then] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor awaiting-author	298/0	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib	5	6	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'trivial1711']	nobody	151-15018 4 months ago	151-15027 4 months ago	23-54870 23 days
20648	anthonyde author:anthonyde	feat: formalize regular expression -> εNFA	The file `Computability/RegularExpressionsToEpsilonNFA.lean` contains a formal definition of Thompson's method for constructing an `εNFA` from a `RegularExpression` and a proof of its correctness. --- - [x] depends on: #20644 - [x] depends on: #20645 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	5	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'qawbecrdtey']	nobody	151-14329 4 months ago	151-14964 4 months ago	75-77754 75 days
23220	mattrobball author:mattrobball	refactor(Module.LinearMap.Defs): make `SemilinearMapClass` extend `AddMonoidHomClass`	Currently `SemilinearMapClass` extends `AddHomClass`. As both `SemilinearMapClass.toAddHomClass` and `AddMonoidHomClass.toAddHomClass` are projections, they have the same priority. With `SemilinearMapClass` declared later, it wins causing expensive failed searches in the algebraic hierarchy before `AddMonoidHomClass.toAddHomClass` is found. The current instance `SemilinearMapClass.toAddMonoidHomClass` has lower priority so we may need to downgrade the priority of the projection also. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	6/10	Mathlib/Algebra/Module/LinearMap/Defs.lean	1	9	['eric-wieser', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	150-16464 4 months ago	150-16464 4 months ago	45-6308 45 days
24665	Komyyy author:Komyyy	feat(Mathlib/Topology/Metrizable/Uniformity): every uniform space is generated by a family of pseudometrics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology WIP	54/0	Mathlib/Topology/Metrizable/Uniformity.lean	1	1	['github-actions']	nobody	149-25238 4 months ago	149-25238 4 months ago	0-1 1 second
23213	mattrobball author:mattrobball	chore(RingTheory.Derivation): add a `LinearMapClass` instance	Often we want `simp` to call `map_zero` or `map_add` for a `Derivation`. To find the `ZeroHomClass` or `AddHomClass` instance necessary it starts to climb up the type class hierarchy including looking for a `LinearMapClass` instance which didn't exist. Consequently, sythesis would look in a lot of crazy places trying to summon ring structures on the module or on derivations itself. Here we add the missing `LinearMapClass` instance so that `simp` is more efficient. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	5/3	Mathlib/RingTheory/Derivation/Basic.lean	1	8	['github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	148-15676 4 months ago	148-15676 4 months ago	47-39026 47 days
23214	mattrobball author:mattrobball	perf(Module.LinearMap.Defs): deprioritize projections to parents for `SemilinearMapClass`	Trying to figure out if a given type has a `SemilinearMapClass` instance when all we want is an `AddHomClass` or a `MulActionSemiHomClass` can be quite expensive since there are multiple ways to crawl the algebraic hierarchy to generate `LinearMapClass` instances. If these fail, then they fail slowly. We deprioritize the projections from `SemilinearMapClass` to `AddHomClass` and `MulActionSemiHomClass` to make this one of the last choices. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	6/0	Mathlib/Algebra/Module/LinearMap/Defs.lean	1	6	['github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	148-15442 4 months ago	148-15442 4 months ago	47-32152 47 days
24155	eric-wieser author:eric-wieser	feat: add a "rw_proc" for fin vectors	This seems a little nicer than an elaborator, since it means I can use the default elaboration rules to handle my first few variables. Ideally there would be something like ```lean rw_procQ {A : Type u} {B : A -> Type v} (a : A) (b : B a) : b = ?rhs => do /-- Context: u v : Level A : Q(Type u) B : Q($A -> Type v) a : Q($A) b : Q($B $a) rhs : Q($B $a) -- metavariable to assign \|- MetaM Q($b = ?rhs) -/ ``` or ```lean rw_proc {A : Type u} {B : A -> Type v} (a : A) (b : B a) : b = ?rhs => do /-- Context: u v : Level A B a b : Expr rhs : MVarId \|- MetaM Expr -/ ``` which would generate the code I wrote here --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data RFC t-meta awaiting-author	27/2	Mathlib/Data/Fin/Tuple/Reflection.lean	1	2	['github-actions', 'urkud']	nobody	148-12819 4 months ago	148-12819 4 months ago	20-83091 20 days
22314	shetzl author:shetzl	feat: add leftmost derivations for context-free grammars	Leftmost derivations are often easier to reason about than arbitrary derivations. This PR adds leftmost variants of Rewrites, Produces and Derives to the existing definition of context-free grammars and proves that a string of terminals can be derived iff it can be leftmost derived. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	383/0	Mathlib.lean,Mathlib/Computability/LeftmostDerivation.lean	2	54	['YaelDillies', 'github-actions', 'madvorak', 'shetzl']	YaelDillies assignee:YaelDillies	147-59693 4 months ago	147-59693 4 months ago	72-3718 72 days
21276	GabinKolly author:GabinKolly	feat(ModelTheory/Substructures): define equivalences between equal substructures	Define first-order equivalences between equal substructures, and prove related properties. --- This is some preparatory work for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic awaiting-author	62/0	Mathlib/ModelTheory/Substructures.lean	1	19	['GabinKolly', 'YaelDillies', 'fpvandoorn', 'github-actions', 'grunweg']	nobody	147-35013 4 months ago	147-35013 4 months ago	46-55730 46 days
23137	grunweg author:grunweg	chore(Topology): some more fun_prop tagging	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology delegated	8/4	Mathlib/Dynamics/Flow.lean,Mathlib/Topology/Algebra/Monoid.lean	2	10	['github-actions', 'grunweg', 'j-loreaux', 'mathlib-bors']	nobody	147-17891 4 months ago	147-17891 4 months ago	34-32727 34 days
24532	robertmaxton42 author:robertmaxton42	feat(LinearAlgebra/FreeProduct): fill out the `FreeProduct.asPowers` namespace	* Replicate the existing API for `LinearAlgebra.FreeProduct` under `FreeProduct.asPowers`, for convenience when working primarily with the power algebra representation * Adds convenience lemmas for using the corresponding quotient relation `rel'` (used in the above). --- - [x] depends on: #24531 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	122/5	Mathlib/LinearAlgebra/FreeProduct/Basic.lean	1	25	['YaelDillies', 'adomani', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robertmaxton42']	nobody	145-65373 4 months ago	145-65425 4 months ago	146-27317 146 days
24008	meithecatte author:meithecatte	chore(EpsilonNFA): replace manual lemmas with @[simps]	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	2/24	Mathlib/Computability/EpsilonNFA.lean	1	2	['YaelDillies', 'github-actions', 'urkud']	nobody	145-60557 4 months ago	145-60557 4 months ago	27-52316 27 days
24744	Timeroot author:Timeroot	Post's lattice	Draft PR for now so I can get CI checks. Eventually want to prove Post's Lattice --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	758/0	Mathlib.lean,Mathlib/Algebra/Clone/Basic.lean,Mathlib/Algebra/Clone/Defs.lean,Mathlib/Algebra/Clone/Instances.lean,Mathlib/Algebra/Clone/PostLattice.lean,Mathlib/Data/Fin/Basic.lean	6	1	['github-actions']	nobody	143-67026 4 months ago	143-67026 4 months ago	0-0 0 seconds
24618	b-mehta author:b-mehta	feat(Analysis): add Schur inequality and variants	Add Schur inequality and some of its common variants. TODO: - [x] add reference to source: https://www.cip.ifi.lmu.de/~grinberg/VornicuS.pdf - [ ] add other generalisations - [ ] move some of the lemmas elsewhere --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP	145/0	Mathlib/Analysis/Convex/Schur.lean	1	16	['b-mehta', 'eric-wieser', 'github-actions']	nobody	142-48090 4 months ago	151-28028 4 months ago	0-2 2 seconds
24957	eric-wieser author:eric-wieser	feat: use ` binderNameHint` in sum_congr	Zulip thread: [#new members > Choosing dummy variable inside summation @ 💬](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Choosing.20dummy.20variable.20inside.20summation/near/518492888) Co-authored-by: Joachim Breitner --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	23/16	Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/List/OfFn.lean,Mathlib/Data/Multiset/Count.lean,Mathlib/Data/Multiset/Filter.lean,Mathlib/Data/Multiset/MapFold.lean,Mathlib/Data/Option/Basic.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Sym/Basic.lean,Mathlib/Data/Sym/Sym2.lean	13	1	['github-actions']	nobody	140-47234 4 months ago	140-48684 4 months ago	140-48732 140 days
5919	MithicSpirit author:MithicSpirit	feat: implement orthogonality for AffineSubspace	Define `AffineSubspace.orthogonal` and `AffineSubspace.IsOrtho`, as well as develop an API emulating that of `Submodule.orthogonal` and `Submodule.IsOrtho`, respectively. Additionally, provide some relevant lemmas exclusive to affine subspaces, which are mostly to do with the relationship between orthogonality and `AffineSubspace.Parallel`. Closes #5539 --- Still WIP as I need to add more docstrings as well as notations for the new definitions. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis WIP help-wanted	287/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/AffineSubspace.lean	2	6	['MithicSpirit', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	MithicSpirit assignee:MithicSpirit	139-30703 4 months ago	139-30721 4 months ago	0-0 0 seconds
22539	joelriou author:joelriou	feat(Algebra/Homology): construction of left resolutions	Given a fully faithful functor `ι : C ⥤ A` to an abelian category, we introduce a structure `Abelian.LeftResolutions ι` which gives a functor `F : A ⥤ C` and a natural epimorphism `π.app X : ι.obj (F.obj X) ⟶ X` for all `X : A`. This is used in order to construct a resolution functor `LeftResolutions.chainComplexFunctor : A ⥤ ChainComplex C ℕ`. This shall be used in order to derive the tensor product of modules and sheaves of modules. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory WIP	271/19	Mathlib.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/LeftResolutions/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean	4	1	['github-actions']	nobody	138-52231 4 months ago	154-41049 5 months ago	59-17063 59 days
21624	sinhp author:sinhp	feat(CategoryTheory): The (closed) monoidal structure on the product category of families of (closed) monoidal categories	Given a family of closed monoidal categories, we show that the product of these categories is a closed monoidal category with the pointwise monoidal structure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	144/0	Mathlib.lean,Mathlib/CategoryTheory/Pi/Basic.lean,Mathlib/CategoryTheory/Pi/Monoidal.lean,Mathlib/CategoryTheory/Pi/MonoidalClosed.lean	4	19	['TwoFX', 'YaelDillies', 'b-mehta', 'github-actions', 'jcommelin', 'sinhp']	nobody	136-68930 4 months ago	136-68930 4 months ago	54-54882 54 days
11155	smorel394 author:smorel394	feat(LinearAlgebra/Multilinear/DirectSum, LinearAlgebra/DirectSum/{PiTensorProduct,Finsupp}): interaction between `MultilinearMap` and `DirectSum`, and between `PiTensorProduct` and `DirectSum`	This does three things: * `MultilinearMap.fromDirectSumEquiv` (in `LinearAlgebra/MultilinearMap/DirectSum.lean`) calculates `MultilinearMap`s on a family of `DirectSum`s. More precisely, if `ι` is a `Fintype`, if `κ i` is a family of types indexed by `ι` and we have a `R`-module `M i j` for every `i : ι` and `j : κ i`, this is the linear equivalence between `Π p : (i : ι) → κ i, MultilinearMap R (fun i ↦ M i (p i)) M'` and `MultilinearMap R (fun i ↦ ⨁ j : κ i, M i j) M'`. * `PiTensorProduct.directSum` (in `LinearAlgebra/DirectSum/PiTensorProduct.lean`): the distributivity property of a `PiTensorProduct` with respect to `DirectSum`s in all its arguments. * `finsuppPiTensorProduct` (in `LinearAlgebra/DirectSum/Finsupp.lean`): If `ι` is a `Fintype`, `κ i` is a family of types indexed by `ι` and `M i` is a family of `R`-modules indexed by `ι`, then the tensor product of the family `κ i →₀ M i` is linearly equivalent to `∏ i, κ i →₀ ⨂[R] i, M i`. - [x] depends on: #11152 - [x] depends on: #11196 - [x] depends on: #17881 - [x] depends on: #17932 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra please-adopt label:t-algebra$	322/0	Mathlib.lean,Mathlib/LinearAlgebra/DFinsupp/PiTensorProduct.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/DirectSum/PiTensorProduct.lean,Mathlib/LinearAlgebra/Multilinear/DFinsupp.lean,Mathlib/LinearAlgebra/Multilinear/DirectSum.lean	6	32	['Ruben-VandeVelde', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'smorel394']	nobody	133-6291 4 months ago	133-8496 4 months ago	6-23591 6 days
19456	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Data/Finsupp/MonomialOrder/DegRevLex): homogeneous reverse lexicographic order	Definition of the homogeneous reverse lexicographic order --- - [x] depends on: #19453 - [x] depends on: #19455 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-order t-algebraic-geometry WIP	362/0	Mathlib.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/Finsupp/MonomialOrder/DegRevLex.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	132-32348 4 months ago	132-32348 4 months ago	0-1720 28 minutes
24690	ScottCarnahan author:ScottCarnahan	feat (Data.Prod): Reverse lexicographic order	This PR implements the type synonym RevLex as a one-field structure, defines an order on products, and proves an order isomorphism with the Lex product with factors switched. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order WIP	141/0	Mathlib.lean,Mathlib/Data/Prod/RevLex.lean	2	4	['ScottCarnahan', 'YaelDillies', 'github-actions']	YaelDillies assignee:YaelDillies	128-73793 4 months ago	128-85486 4 months ago	19-33859 19 days
22919	plp127 author:plp127	feat(Data/Fintype/Pi): Make `Fintype` instance for `RelHom`s computable	Makes the `Fintype` instance for rel homs computable. See this [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Classical.20vs.20constructive.20logic.20in.20computation/near/496220816) message. --- - [x] depends on: #24748 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	178/44	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Data/Fintype/CardEmbedding.lean,Mathlib/Data/Fintype/Pi.lean	5	29	['IvanRenison', 'b-mehta', 'eric-wieser', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'plp127']	b-mehta assignee:b-mehta	127-81534 4 months ago	127-81534 4 months ago	73-73341 73 days
25170	eric-wieser author:eric-wieser	refactor: make basis computable	I claim that in the long run, `Basis.repr` should be a `DFinsupp` not `Finsupp`, so that it is computable. To make this change incrementally, we can store a `DFinsupp` internally today, and keep `repr` and `ofRepr` working with finsupp. This at least would allow building a large basis object, and then using `repr'` to compute with it. The cost of this intermediate state is a loss of many defeqs. --- - [ ] depends on: #25166 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	66/21	Mathlib/LinearAlgebra/Basis/Basic.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	127-10786 4 months ago	127-62184 4 months ago	0-0 0 seconds
24065	kim-em author:kim-em	chore: script to give topological sort of modules	This script is not useful by itself: it just gives a topological sort of Mathlib's import graph. But I've several times found it useful when I want to modify many files systematically with minimal rebuilding: just work backwards through the list.	awaiting-author	96/0	scripts/README.md,scripts/topological_sort.py	2	5	['github-actions', 'jcommelin', 'kim-em']	jcommelin assignee:jcommelin	123-72961 4 months ago	123-72961 4 months ago	48-7769 48 days
20238	maemre author:maemre	feat(Computability/DFA): Closure of regular languages under some set operations	This shows that regular languages are closed under complement and intersection by constructing DFAs for them. --- Closure under all other operations will be proved when someone adds the proof for DFA<->regular expression equivalence, so they are not part of this PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor awaiting-author	159/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	59	['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'meithecatte', 'urkud']	EtienneC30 assignee:EtienneC30	121-67189 3 months ago	151-14928 4 months ago	48-67492 48 days
25429	Paul-Lez author:Paul-Lez	feat(Analysis/PDE/Quasilinear/Defs): Add definitions about quasilinear first order PDEs	This PR introduces some basic definitions related to first order quasilinear PDEs. In a subsequent PR (I'm currently cleaning up the code), these will be used to state and prove some results about how solutions to quasilinear PDEs vary along characteristic curves. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	141/0	Mathlib.lean,Mathlib/Analysis/PDE/Quasilinear/Defs.lean	2	1	['github-actions']	nobody	121-48674 3 months ago	121-56844 3 months ago	0-0 0 seconds
25473	adomani author:adomani	feat(CI): check that Mathlib files have lean or md extension	Twice recently there have been files with an "intended" `.lean` extension in `Mathlib/`: * #24942, ending in `;lean`; * #25457, ending in `.Lean`. `mk_all` does not add these files to `Mathlib.lean`, since they do not end in `.lean` and this later causes problems. This CI step checks that all files in `Mathlib/` end with `.lean` or `.md`. See #25474 for a test where the new step [correctly fails](https://github.com/leanprover-community/mathlib4/actions/runs/15464097783/job/43532018379?pr=25474). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI delegated	10/0	.github/workflows/lint_and_suggest_pr.yml	1	10	['adomani', 'bryangingechen', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	120-49465 3 months ago	120-50355 3 months ago	0-11212 3 hours
24441	MrSumato author:MrSumato	feat(Data/List): add Lyndon-Schutzenberger theorem on list commutativity	Add Lyndon-Schutzenberger theorem on list commutativity. Included definition for List.repeatSelf that returns list repeated n times. --- This is my first mathlib PR, so any comments are highly appreciated. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	129/1	Mathlib.lean,Mathlib/Data/List/Commutativity.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/Lemmas.lean	4	35	['MrSumato', 'github-actions', 'grunweg', 'plp127']	grunweg assignee:grunweg	119-48966 3 months ago	119-48966 3 months ago	29-59355 29 days
23929	meithecatte author:meithecatte	feat(Computability/NFA): improve bound on pumping lemma	--- - [x] depends on: #25321 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor	101/10	Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean	2	41	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'meithecatte']	nobody	118-24580 3 months ago	118-24581 3 months ago	34-10595 34 days
25579	JovanGerb author:JovanGerb	feat(Order/Notation): only allow ⊔/⊓ for non-linear orders	⊔/⊓ is the same as max/min. The difference is that it is meant to be used if and only if there is no linear order. This PR implements a check for one of the two directions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	33/7	Mathlib/Order/Notation.lean	1	1	['github-actions']	nobody	117-57688 3 months ago	118-224 3 months ago	0-0 0 seconds
25035	ScottCarnahan author:ScottCarnahan	feat (Algebra/Module/Equiv/Defs): Linear equivalence between linear hom and semilinear hom.	Given a ring homomorphism `σ₂ : R →+* R₂`, an `R`-module `M`, and a module `M₂` for both `R` and `R₂` satisfying `SMulCommClass R R₂ M₂` and `(σ₂ r) • x = r • x`, we produce an `R₂`-linear equivalence between `M →ₗ[R] M₂` and `M →ₛₗ[σ₂] M₂`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	21/0	Mathlib/Algebra/Module/Equiv/Defs.lean	1	1	['github-actions']	nobody	116-70397 3 months ago	116-70397 3 months ago	20-7584 20 days
25034	ScottCarnahan author:ScottCarnahan	feat (Algebra/Module/Equiv/Basic): Restriction of scalars from a semilinear equivalence to a linear equivalence.	If `M` and `M₂` are both `R`-modules and modules for `S` and `S₂`, respectively, then for any ring isomorphism `e` between `S` and `S₂` and any `e`-semilinear equivalence between `M` and `M₂` that respects the `R`-action, we obtain an `R`-linear equivalence between `M` and `M₂`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	28/0	Mathlib/Algebra/Module/Equiv/Basic.lean	1	1	['github-actions']	nobody	116-70372 3 months ago	116-70372 3 months ago	20-11468 20 days
24540	robertmaxton42 author:robertmaxton42	feat(Quiv): add the empty, vertex, point, interval, and walking quivers	Add: * The empty quiver * The vertex quiver (one vertex, and no edges) and the point quiver (one vertex, one self-edge) * The interval quiver (two vertices with an edge between them) * The walking quiver (vertices `0` and `1` with two edges both `0 -> 1`. Functors from the walking quiver to `Type` define quivers, by interpreting `F.obj 0` as the type of vertices, `F.obj 1` as the type of edges, using one of the two edges to label the source of every edge and using the other to label the target.) - [x] depends on: #24538 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	370/0	Mathlib.lean,Mathlib/CategoryTheory/Category/Quiv/Shapes.lean,Mathlib/CategoryTheory/Category/Quiv/WalkingQuiver.lean,Mathlib/Logic/Small/Defs.lean	4	13	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robertmaxton42', 'robin-carlier']	nobody	115-49395 3 months ago	119-13408 3 months ago	0-80193 22 hours
22790	mhk119 author:mhk119	feat: Extend `taylor_mean_remainder_lagrange` to `x < x_0`	The `taylor_mean_remainder_lagrange` theorem has the assumption that $x_0 < x$. In many applications, we need $x < x_0$ and one cannot use the current version to obtain this (see [zulip](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Taylor's.20theorem)). This PR introduces a set of theorems that push negations through Taylor expansions so that one can extend `taylor_mean_remainder_lagrange` to the case when $x < x_0$. These theorems should also be useful elsewhere since they are quite general.	new-contributor t-analysis awaiting-author	111/1	Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/Taylor.lean	3	12	['Paul-Lez', 'github-actions', 'grunweg', 'mhk119']	nobody	115-9085 3 months ago	176-50781 5 months ago	30-77130 30 days
21344	kbuzzard author:kbuzzard	chore: attempt to avoid diamond in OreLocalization	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra please-adopt label:t-algebra$	16/5	Mathlib/RingTheory/OreLocalization/Basic.lean	1	6	['erdOne', 'github-actions', 'kbuzzard']	nobody	115-6663 3 months ago	115-8754 3 months ago	53-20069 53 days
25683	eric-wieser author:eric-wieser	feat: Enumeration of NonemptyInterval	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data	52/4	Mathlib/Data/Sym/Sym2/Fin.lean,Mathlib/Data/Sym/Sym2/Order.lean	2	1	['github-actions']	nobody	115-5689 3 months ago	115-5689 3 months ago	0-0 0 seconds
25746	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): `Cancelable` boilerplate for the `rotate_isos` WIP tactic	This PR adds some boilerplate that will be used in a forthcoming PR implementing a `rotate_isos` tactic that aims to provide easy ways of moving one or more morphisms that can be inferred to be isomorphisms (not necessarily through the `IsIso typeclass, but also directly by recognizing them as e.g components of natural isomorphisms, or functor application to such morphisms). The boilerplate in this PR abstracts the notion of a cancelable expression for a morphism in a composition of (iso)morphisms in a category, and records a global reference to a list of "cancelable factories", _i.e_ functions that try to recognize term in an expression as a "cancelable" morphism, and provides helper to register such functions. --- First part of a series of 3 PRs contributing the `rotate_isos` tactic to mathlib. Second part will actually implement the tactic, and provide a test suite. Please read the description of the second PR (#24454) to get more details. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24452. Original PR: https://github.com/leanprover-community/mathlib4/pull/24452	t-category-theory t-meta awaiting-author	162/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,scripts/noshake.json	4	1	['github-actions']	nobody	113-67146 3 months ago	113-67175 3 months ago	0-0 0 seconds
25585	Paul-Lez author:Paul-Lez	feat(Tactic/Linters/DeprecatedSimpLemma): lint for deprecated simp lemmas	The deprecated simp lemma linter flags declarations that have both the `deprecated` and `simp` attributes. See Zulip discussion: [#mathlib4 > Help with Mathlib.Order.Interval.Finset.Defs @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Help.20with.20Mathlib.2EOrder.2EInterval.2EFinset.2EDefs/near/505994843) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter awaiting-author	105/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/DeprecatedSimpLemma.lean,MathlibTest/DeprecatedSimpLemmaTest.lean	4	7	['adomani', 'github-actions', 'grunweg']	nobody	113-63259 3 months ago	117-19076 3 months ago	0-34675 9 hours
25802	dagurtomas author:dagurtomas	feat(AlgebraicTopology): anodyne morphisms of simplicial sets	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #20201. Original PR: https://github.com/leanprover-community/mathlib4/pull/20201	t-topology WIP	148/0	Mathlib.lean,Mathlib/AlgebraicTopology/Anodyne.lean,Mathlib/AlgebraicTopology/KanFibration.lean,Mathlib/CategoryTheory/MorphismProperty/WeakSaturation.lean	4	1	['github-actions']	nobody	113-55947 3 months ago	113-55964 3 months ago	0-2 2 seconds
25835	erdOne author:erdOne	WIP: Weierstrass elliptic functions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #21662. Original PR: https://github.com/leanprover-community/mathlib4/pull/21662	t-analysis WIP	1461/0	Mathlib/Analysis/Elliptic/Basic.lean	1	1	['github-actions']	nobody	112-62124 3 months ago	112-62166 3 months ago	0-33 33 seconds
25838	Bergschaf author:Bergschaf	feat(Order/Atoms): Finsets are Atomistic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-order	31/0	Mathlib/Order/Atoms.lean	1	1	['github-actions']	nobody	112-55406 3 months ago	112-55406 3 months ago	0-0 0 seconds
25765	JovanGerb author:JovanGerb	feat(gcongr): lemma for rewriting inside divisibility	TODO: add test to show that we can rewrite using `a ≡ b [ZMOD n]` inside `n ∣ 2 * a + 1`. edit: it's not yet entirely clear if this is the right thing to do. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data delegated	5/0	Mathlib/Data/Int/ModEq.lean	1	3	['fpvandoorn', 'github-actions', 'mathlib-bors']	nobody	112-7902 3 months ago	112-43440 3 months ago	1-19951 1 day
25871	eric-wieser author:eric-wieser	refactor: generalize rank lemmas to semirings	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	18/8	Mathlib/LinearAlgebra/Dimension/Finite.lean	1	1	['github-actions']	nobody	111-35363 3 months ago	111-35389 3 months ago	0-0 0 seconds
25911	BoltonBailey author:BoltonBailey	make `a / b` simp normal form	This PR continues the work from #25631. Original PR: https://github.com/leanprover-community/mathlib4/pull/25631	t-algebra label:t-algebra$	11/1	Mathlib/Algebra/Group/Defs.lean	1	2	['BoltonBailey', 'github-actions']	nobody	110-41153 3 months ago	110-41156 3 months ago	0-0 0 seconds
25918	BoltonBailey author:BoltonBailey	feat: one time pad string diagram	This PR continues the work from #10655. Original PR: https://github.com/leanprover-community/mathlib4/pull/10655		159/0	MathlibTest/StringDiagram.lean	1	2	['BoltonBailey', 'github-actions']	nobody	110-39297 3 months ago	110-39385 3 months ago	0-0 0 seconds
25990	Multramate author:Multramate	chore(NumberTheory/EllipticDivisibilitySequence): rename definitions	This PR continues the work from #25132. Original PR: https://github.com/leanprover-community/mathlib4/pull/25132	t-number-theory	265/45	Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	1	2	['Multramate', 'github-actions']	nobody	109-15202 3 months ago	109-15202 3 months ago	0-0 0 seconds
25987	Multramate author:Multramate	refactor(AlgebraicGeometry/EllipticCurve/Affine/*): some minor changes	This PR continues the work from #24571. Original PR: https://github.com/leanprover-community/mathlib4/pull/24571	t-algebraic-geometry	0/12	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean	2	n/a	['Multramate', 'github-actions', 'grunweg']	nobody	108-61763 3 months ago	unknown	unknown
25921	BoltonBailey author:BoltonBailey	feat: scripts to analyze overlap between namespaces	This PR continues the work from #11385. Original PR: https://github.com/leanprover-community/mathlib4/pull/11385	migrated-from-branch t-meta WIP	86/0	scripts/RecordNamespaces.lean,scripts/namespace-overlap.py	2	1	['github-actions']	nobody	108-27164 3 months ago	108-27164 3 months ago	2-11832 2 days
26085	grunweg author:grunweg	feat: disjoint unions distribute with products of manifolds	This PR continues the work from #22611. Original PR: https://github.com/leanprover-community/mathlib4/pull/22611	t-differential-geometry please-adopt WIP	75/6	Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean	2	2	['github-actions', 'grunweg']	nobody	107-49222 3 months ago	107-49224 3 months ago	0-74 1 minute
26174	grunweg author:grunweg	feat: split continuous linear maps	We define split linear maps and prove their basic properties. Manually migrated from #23186. --- There are two sorries left. One is `ClosedComplemented.prod`; the other relates to the composition of split maps. Help with both is welcome. [This zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Composition.20of.20immersions.20is.20an.20immersion.3A.20infinite-dimensio/with/507300190) contains a proof of the non-trivial sorry. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP help-wanted	249/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean	2	1	['github-actions']	nobody	106-15780 3 months ago	106-15807 3 months ago	0-0 0 seconds
25803	erdOne author:erdOne	feat: taylor expansion of `1 / z ^ r`	--- This might exist somewhere else but I couldn't find them. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #21693. Original PR: https://github.com/leanprover-community/mathlib4/pull/21693	t-analysis awaiting-author	95/0	Mathlib.lean,Mathlib/Analysis/SpecificLimits/InvPow.lean	2	5	['erdOne', 'github-actions', 'j-loreaux', 'vasnesterov']	nobody	105-22795 3 months ago	105-22795 3 months ago	8-29520 8 days
26239	BoltonBailey author:BoltonBailey	feat: add sample pre-commit git hook file	This PR adds a sample pre-commit git hook file that runs `mk_all` and `lint-style`. The script provides instructions on how to activate these as git hooks. Installing these would be optional, but hopefully people who would install them would find it easier to avoid commits that immediately fail linters. Discussion of hooks on [Zulip here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Automatic.20setup.20and.20distribution.20of.20git.20hooks/with/525103090). Some thoughts: - Perhaps it would be better, for speed, to attempt to avoid certain commands if the staged changes suggest they would be unnecessary. - i.e. only run linters on files that have been updated / only run `mk_all` if a file has been added or deleted. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	18/0	git_hooks/pre-commit	1	1	['github-actions']	nobody	105-18997 3 months ago	105-18997 3 months ago	0-1331 22 minutes
26231	chrisflav author:chrisflav	feat(CategoryTheory/Sites): sheaf condition and coproducts	We show that under suitable conditions, checking that a presheaf is a sheaf for a covering is equivalent to checking it on the single object covering by the coproduct. --- I am not sure this is the correct file, but I had no better idea. Happy to move it somewhere else. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	58/0	Mathlib/CategoryTheory/Sites/Sheaf.lean	1	3	['chrisflav', 'github-actions', 'joelriou']	nobody	103-61026 3 months ago	103-61684 3 months ago	1-60053 1 day
24395	rudynicolop author:rudynicolop	feat(Data/List): list splitting definitions and lemmas	Adds definitions and lemmas for obtaining all prefixes and suffixes of lists. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	143/2	Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/List/TakeDrop.lean	2	4	['BoltonBailey', 'github-actions']	ericrbg assignee:ericrbg	103-16925 3 months ago	103-16925 3 months ago	57-9536 57 days
21450	eric-wieser author:eric-wieser	feat: improve trace nodes for `positivity`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	25/7	Mathlib/Tactic/Positivity/Core.lean	1	1	['github-actions']	nobody	103-15776 3 months ago	240-72490 7 months ago	0-0 0 seconds
26292	RemyDegenne author:RemyDegenne	feat(MeasureTheory): tightness of the range of a sequence	* `isTightMeasureSet_range_iff_tendsto_limsup_measure_norm_gt`: in a proper normed group, the range of a sequence of measures `μ : ℕ → Measure E` is tight if and only if the function `r : ℝ ↦ limsup (fun n ↦ μ n {x \| r < ‖x‖}) atTop` tends to `0` at infinity. * `isTightMeasureSet_range_iff_tendsto_limsup_inner`: in a finite-dimensional inner product space, the range of a sequence of measures `μ : ℕ → Measure E` is tight if and only if the function `r : ℝ ↦ limsup (fun n ↦ μ n {x \| r < ‖⟪y, x⟫_𝕜‖}) atTop` tends to `0` at infinity for all `y`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24838. Original PR: https://github.com/leanprover-community/mathlib4/pull/24838	t-measure-probability awaiting-author	197/2	Mathlib/MeasureTheory/Measure/TightNormed.lean	1	1	['github-actions']	nobody	102-65023 3 months ago	102-65088 3 months ago	0-1 1 second
26293	RemyDegenne author:RemyDegenne	feat: tightness from convergence of characteristic functions	If the characteristic functions of a sequence of measures `μ : ℕ → Measure E` on a finite dimensional inner product space converge pointwise to a function which is continuous at 0, then `{μ n \| n}` is tight. --- - [x] depends on: #24838 - [x] depends on: #24846 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24949. Original PR: https://github.com/leanprover-community/mathlib4/pull/24949	t-measure-probability WIP	352/2	Mathlib.lean,Mathlib/MeasureTheory/Measure/TightCharFun.lean,Mathlib/MeasureTheory/Measure/TightNormed.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	102-64034 3 months ago	102-64035 3 months ago	0-2 2 seconds
20924	tomaz1502 author:tomaz1502	feat(Computability/QueryComplexity): Oracle-based computation	This PR adds the types and lemmas for oracle-based computation. In this model, computations are run on a monad which also counts the number of oracle queries executed. With it, it becomes possible to reason about the upper bound of the query complexity of algorithms. In the future, we could extend this work to include the necessary bits from information theory and probability to also reason about lower bounds on query complexity, like the work in https://github.com/girving/debate. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2318629.20runtime.20complexity.20of.20sorting.20a.20list Co-authored-by: Geoffrey Irving --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability	305/0	Mathlib.lean,Mathlib/Computability/QueryComplexity/Basic.lean,Mathlib/Computability/QueryComplexity/Defs.lean	3	59	['eric-wieser', 'girving', 'github-actions', 'quangvdao', 'tomaz1502']	nobody	102-43829 3 months ago	254-37017 8 months ago	254-36995 254 days
26327	eric-wieser author:eric-wieser	chore: split the tests for positivity	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		528/2	MathlibTest/Positivity/basic.lean,MathlibTest/positivity.lean	2	1	['github-actions']	nobody	102-13793 3 months ago	102-13882 3 months ago	0-0 0 seconds
26087	grunweg author:grunweg	feat: a `SliceModel` typeclass for models with corners for embedded submanifolds	We define a new typeclass to denote a model with corners which "embeds" into another one: there are an embedding of the underlying topological spaces and a continuous linear inclusion between the normed spaces, which are compatible with the maps given by the models with corners. This condition is used for defining smooth (immersed and embedded) submanifolds: for `M` to be a submanifold of `N`, to boot their models with corners should be slice models. This will be defined in a future PR. To prove this definition is workable, we construct many basic instances of slice models - each model with corners is one over itself - slice models are transitive - each model with corners I embeds into two products `I.prod J` and `J.prod I` - Euclidean n-half-space embeds into Euclidean n-space - a Euclidean n-quadrant embeds into Euclidean half-space (hence into Euclidean n-space) - if n\leq m, Euclidean n-space embeds into Euclidean m-space [zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Infinite-dimensional.20manifolds/near/413117885) ----------- - [x] depends on: #26083 - [x] depends on: #26082 - [x] depends on: #26086 - [x] depends on: #25705 This PR continues the work from #25505.	t-differential-geometry	229/0	Mathlib.lean,Mathlib/Geometry/Manifold/SliceModel.lean	2	3	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	101-28294 3 months ago	101-38974 3 months ago	101-40429 101 days
26389	jjdishere author:jjdishere	feat(RingTheory): Perfectoid Field	This PR continues the work from #19972. Original PR: https://github.com/leanprover-community/mathlib4/pull/19972	t-algebra t-analysis t-topology WIP label:t-algebra$	150/0	Mathlib/RingTheory/Perfectoid.lean	1	2	['github-actions', 'jjdishere']	nobody	100-84737 3 months ago	100-84744 3 months ago	0-69 1 minute
26390	jjdishere author:jjdishere	feat(Topology/Algebra): Krasner's lemma	This PR continues the work from #18444. Original PR: https://github.com/leanprover-community/mathlib4/pull/18444	t-algebra t-topology t-number-theory WIP label:t-algebra$	440/0	Mathlib.lean,Mathlib/Topology/Algebra/Krasner.lean	2	n/a	['github-actions', 'jjdishere']	nobody	100-84530 3 months ago	unknown	unknown
26376	maddycrim author:maddycrim	Simons2025	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor WIP	29/0	Mathlib/RingTheory/Localization/Pi.lean	1	1	['github-actions']	faenuccio assignee:faenuccio	100-42915 3 months ago	101-21388 3 months ago	0-13 13 seconds
26432	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Data.Nat.LogFueled): fueled version of `clog`	This PR continues the work from #25557. Original PR: https://github.com/leanprover-community/mathlib4/pull/25557	t-data	201/0	Mathlib.lean,Mathlib/Data/Nat/LogFueled.lean	2	2	['AntoineChambert-Loir', 'github-actions']	nobody	99-58269 3 months ago	99-58271 3 months ago	99-58315 99 days
25739	literandltx author:literandltx	feat(NumberTheory/LegendreSymbol): Add sqrt‐of‐residue theorems for p=4k+3 and p=8k+5	Add a new file `QuadraticResidueRoots.lean` under `Mathlib/NumberTheory/LegendreSymbol/` that proves two explicit “square-root of quadratic residue” theorems for primes of the specific form. - `exists_sqrt_of_residue_mod4_eq3` for primes `p = 4k + 3` - `exists_sqrt_of_residue_mod8_eq5`* for primes `p = 8*k + 5` It also introduces the helper lemmas `euler_criterion_traditional` and `legendreSym.at_two_mod8_eq_5`. Import lines in `Mathlib.lean` and `Mathlib/NumberTheory/LegendreSymbol/Basic.lean` have been updated accordingly.	new-contributor t-number-theory awaiting-author	217/0	Mathlib.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticReciprocity.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticResidueRoots.lean	4	2	['github-actions', 'kckennylau']	literandltx assignee:literandltx	95-62442 3 months ago	96-5128 3 months ago	17-63153 17 days
25993	Multramate author:Multramate	feat(Algebra/Group/Units/Hom): add map lemmas	This PR continues the work from #25609. Original PR: https://github.com/leanprover-community/mathlib4/pull/25609	t-algebra awaiting-author label:t-algebra$	27/10	Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Hom.lean	2	5	['Multramate', 'Ruben-VandeVelde', 'github-actions']	nobody	94-64194 3 months ago	94-64194 3 months ago	14-37502 14 days
26013	tsuki8 author:tsuki8	feat(Data/Finset/Card,Data/Set/Finite/Basic)	add `card_bijOn` and `finset_subset_preimage_of_finite_image` Add `card_bijOn`: proves that for a bijection between finsets, their cardinalities are equal Add `finset_subset_preimage_of_finite_image`: constructs a finset subset preserving image cardinality Co-authored-by: Junyu Guo --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	15/0	Mathlib/Data/Finset/Card.lean,Mathlib/Data/Set/Finite/Basic.lean	2	5	['Ruben-VandeVelde', 'github-actions']	nobody	94-50817 3 months ago	94-63109 3 months ago	13-85893 13 days
26348	mans0954 author:mans0954	WIP: feature(Analysis/LocallyConvex/Prime): The prime map	This PR continues the work from #24385. Original PR: https://github.com/leanprover-community/mathlib4/pull/24385	t-analysis WIP	125/0	Mathlib.lean,Mathlib/Analysis/LocallyConvex/Prime.lean	2	2	['github-actions', 'mans0954']	nobody	93-21267 3 months ago	96-25498 3 months ago	5-43062 5 days
26346	mans0954 author:mans0954	feature(LinearAlgebra/QuadraticForm/TensorProduct): Extend `baseChange_ext` to work over a free module	This PR continues the work from #21814. Original PR: https://github.com/leanprover-community/mathlib4/pull/21814	t-algebra WIP label:t-algebra$	105/5	Mathlib/LinearAlgebra/Basis/Bilinear.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct.lean	2	2	['github-actions', 'mans0954']	nobody	93-21191 3 months ago	96-25322 3 months ago	0-0 0 seconds
26283	kckennylau author:kckennylau	(WIP) Resultant	--- This is a WIP PR for resultant for me to get cache. PRs produced: * [x] #25139 (migrated to #26091) * [x] #25270 * [x] #25279 * [x] #25293 * [x] #25294 * [x] #25305 * [x] #26285 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	1190/0	Mathlib.lean,Mathlib/Algebra/Polynomial/Resultant/Basic.lean,Mathlib/Algebra/Polynomial/Resultant/MvPolynomial.lean,Mathlib/RingTheory/Polynomial/Discriminant.lean	4	1	['github-actions']	nobody	93-5722 3 months ago	102-79539 3 months ago	0-19 19 seconds
26743	grunweg author:grunweg	WIP: product rule for Lie bracket on manifolds	On the path towards geodesics and the Levi-Civita connection. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry WIP	119/22	Mathlib/Geometry/Manifold/VectorField/LieBracket.lean,Mathlib/Geometry/Manifold/VectorField/Pullback.lean	2	1	['github-actions']	nobody	91-23878 2 months ago	91-45352 2 months ago	0-1 1 second
16303	grunweg author:grunweg	feat(CI): check for badly formatted titles or missing/contradictory labels	--- The zulip workflow is entirely cargo-culted from #16296; please review carefully. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI awaiting-author	325/0	.github/build.in.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ValidatePRTitle.lean,MathlibTest/ValidatePRTitle.lean,lakefile.lean,scripts/README.md,scripts/check-title-labels.lean	8	44	['Command-Master', 'adomani', 'bryangingechen', 'edegeltje', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant']	bryangingechen assignee:bryangingechen	90-81729 2 months ago	90-81729 2 months ago	78-54824 78 days
20784	eric-wieser author:eric-wieser	fix: prevent `exact?` recursing forever on `n = 55`	Test case thanks to @llllvvuu: ```lean import Mathlib.SetTheory.Ordinal.Basic theorem natCast_inj {m n : ℕ} : (m : Ordinal) = n ↔ m = n := sorry example (n : Nat) : n = 55 := by exact? ``` This is surely a workaround for some unreported lean bug. The bug still exists for `n = 71` or higher, so we can still track down the bug after merging this patch. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	22/3	Mathlib/SetTheory/Ordinal/Basic.lean,MathlibTest/LibrarySearchRecDepth.lean	2	15	['Command-Master', 'eric-wieser', 'github-actions', 'kbuzzard', 'kim-em', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	90-49250 2 months ago	90-49285 2 months ago	123-36550 123 days
26561	b-mehta author:b-mehta	feat(LiminfLimsup): liminf of an antitone function is its supremum	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #26560	t-topology	24/0	Mathlib/Topology/Order/LiminfLimsup.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	89-25278 2 months ago	89-25489 2 months ago	0-6 6 seconds
26449	faenuccio author:faenuccio	feat(NumberTheory/LocalFields/Basic): provide the definition of (valued) Local Field	In this PR we give the first definition of a local field, scoped in the namespace `Valued`, as a field endowed with a `Valued` structure such that the valuation is discrete, it is complete with respect to the topology induced by the valuation, and the residue field is finite. In future PR's we'll provide an analogous charcterizations (in purely topological terms) and the theory of extensions of local fields. A first version was in #23730, now closed. Co-authored-by: María Inés de Frutos-Fernández @mariainesdff - [x] depends on: #23727 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory WIP label:t-algebra$	78/0	Mathlib.lean,Mathlib/NumberTheory/LocalFields/Basic.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	88-61810 2 months ago	88-61817 2 months ago	0-91 1 minute
26878	adomani author:adomani	feat: declaration diff script in Lean	Although, it is still text-based, the parsing of the output of `git diff` is now done in Lean. The new script already performed better than the old one in a couple of situations: * #26877 See [this comment](https://github.com/leanprover-community/mathlib4/pull/26847#issuecomment-3045308885) * #26849 See [this comment](https://github.com/leanprover-community/mathlib4/pull/26849#issuecomment-3045092965) --- This is still work in progress: the parsing should be more or less done, but I have not yet hooked this into the action workflow. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		497/0	scripts/DeclarationDiff_text_based.lean	1	4	['adomani', 'bryangingechen', 'github-actions']	bryangingechen assignee:bryangingechen	87-63777 2 months ago	88-27328 2 months ago	0-0 0 seconds
26990	joelriou author:joelriou	feat(CategoryTheory/Abelian): Noetherian objects form a Serre class	This PR continues the work from #22367. Original PR: https://github.com/leanprover-community/mathlib4/pull/22367	t-category-theory WIP	311/14	Mathlib.lean,Mathlib/CategoryTheory/Abelian/SerreClass/NoetherianObject.lean,Mathlib/CategoryTheory/Abelian/Subobject.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean	5	1	['github-actions']	nobody	84-56022 2 months ago	84-56041 2 months ago	0-45 45 seconds
26994	Paul-Lez author:Paul-Lez	feat(Topology/MetricSpace/Pseudo/Defs): add easy lemma about opens in topological spaces	Split from #26992 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology easy awaiting-author	9/0	Mathlib/Topology/MetricSpace/Pseudo/Defs.lean	1	4	['Paul-Lez', 'github-actions', 'grunweg']	nobody	84-42434 2 months ago	84-43856 2 months ago	0-11233 3 hours
27069	FrankieNC author:FrankieNC	feat(Analysis/MetricSpace/HausdorffDimension): prove dimH of intervals and segments is 1	Add theorems `dimH_Icc01` and `dimH_segment` showing that the Hausdorff dimension of the unit interval [0,1] and of any non-degenerate real segment is 1. The key idea is that the segment is the image of [0,1] under a bi-Lipschitz map. We explicitly construct this map and prove it is both Lipschitz and antilipschitz, allowing us to transfer the dimension result from the unit interval. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology awaiting-author	63/0	Mathlib/Topology/MetricSpace/HausdorffDimension.lean	1	10	['AntoineChambert-Loir', 'FrankieNC', 'github-actions', 'grunweg']	nobody	82-22867 2 months ago	82-35351 2 months ago	0-13398 3 hours
27135	JovanGerb author:JovanGerb	feat: `gconvert` tactic	The `gconvert` tactic calls `gcongr` internally, and it can be used as replacement/generalization of `peel`. One drawback is that `peel` can unfold definitions until they are a binder, while `gconvert` cannot, but I think this is acceptable. TODO: replace all uses of `peel` with either `gconvert` or `congr!` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	320/17	Mathlib/Tactic/GCongr/Core.lean,MathlibTest/GConvert.lean	2	1	['github-actions']	nobody	81-41549 2 months ago	81-41549 2 months ago	0-0 0 seconds
27206	grhkm21 author:grhkm21	feat(CategoryTheory/Adjunction): partial adjoints are adjoints	Partial adjunctions `F.partial{Left,Right}Adjunction` are adjunctions when fully defined i.e. `F.{left,right}AdjointObjIsDefined = ⊤`.	t-category-theory	48/2	Mathlib/CategoryTheory/Adjunction/PartialAdjoint.lean	1	1	['github-actions']	nobody	79-52219 2 months ago	79-52237 2 months ago	79-52264 79 days
18230	digama0 author:digama0	feat(Tactic/ScopedNS): extend `scoped[NS]` to more commands	refactor `ScopedNS` to remove error prone repetitiveness and extend it to other commands such as `syntax`, `macro`, `elab`, etc. Co-authored-by: Jon Eugster --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	201/26	Mathlib/Tactic/ScopedNS.lean,MathlibTest/scopedNS.lean	2	7	['adomani', 'digama0', 'eric-wieser', 'github-actions', 'joneugster', 'kbuzzard']	nobody	78-56913 2 months ago	221-56418 7 months ago	41-32344 41 days
26962	themathqueen author:themathqueen	feat(Data/Nat/Fib/Basic): some API for `Nat.fib`	Added some helpful lemmas for `Nat.fib`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	24/0	Mathlib/Data/Nat/Fib/Basic.lean	1	7	['Ruben-VandeVelde', 'github-actions', 'themathqueen', 'vihdzp']	nobody	77-25409 2 months ago	77-25410 2 months ago	8-31586 8 days
27187	Komyyy author:Komyyy	feat: `NONote` represents ordinals < ε₀	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory WIP	186/12	Mathlib/SetTheory/Ordinal/Notation.lean	1	2	['github-actions', 'vihdzp']	nobody	74-7573 2 months ago	79-84421 2 months ago	0-2 2 seconds
27330	BoltonBailey author:BoltonBailey	feat(Tactic/Linter): add TacticMs for natural subtraction and division	This is a (pair of) short tactic scripts I wrote for Project Numina while vetting formal formal statements (thanks to [this guide](https://github.com/mirefek/lean-tactic-programming-guide) for the primer). The scripts check for the presence of natural subtraction and natural division, which can often lead to mistakes. Of course, Mathlib allows natural subtraction freely, so it's not obvious this could be made useful to Mathlib itself. Still, maybe it's of use to some other project, so I'll leave it here. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter	66/0	Mathlib/Tactic/Linter/TruncatedNat.lean	1	2	['BoltonBailey', 'eric-wieser', 'github-actions']	nobody	74-1038 2 months ago	74-21363 2 months ago	0-0 0 seconds
26803	bjoernkjoshanssen author:bjoernkjoshanssen	feat: second partial derivatives test	We prove that if `f` is a real-valued function on `n`-dimensional Euclidean space with vanishing gradient at `x₀`, having a power series on a ball of positive radius around `x₀`, whose second Frechét derivative is positive definite at `x₀`, then `f` has local minimum at `x₀`. This project was started at the Lean for Mathematicians workshop hosted by the Simons Foundation in June 2025 in a group consisting of Bjørn Kjos-Hanssen, Erin Griffin, Asaf Kapota, and Janani Lakshmanan, see repo at https://github.com/bjoernkjoshanssen/secondpartial --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	325/0	Mathlib.lean,Mathlib/Analysis/Calculus/PartialDerivativeTest.lean	2	11	['bjoernkjoshanssen', 'github-actions', 'j-loreaux', 'themathqueen']	nobody	73-76626 2 months ago	84-83385 2 months ago	5-11006 5 days
12006	adomani author:adomani	feat: the `suffa` tactic	The `suffa` tactic. `suffa tac` runs the tactic sequence `tac` and returns a `Try this:` suggestion of the form `suffices [target_after_tac] by tac; assumption`. For example ```lean example {m n : Nat} (h : m = n) : 0 + m = n := by suffa rewrite [Nat.zero_add] assumption ``` suggests the replacement ```lean example {m n : Nat} (h : m = n) : 0 + m = n := by suffices m = n by rewrite [Nat.zero_add] assumption assumption ``` See [this thread](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Try.20this.3A.20suffices.20simpa) as well as [this message](https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.2311822.20flexible.20tactics.20linter/near/431895664). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	161/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Suffa.lean,test/Suffa.lean	4	3	['MoritzBeroRoos', 'YaelDillies']	nobody	72-32000 2 months ago	484-54240 1 year ago	58-85902 58 days
27435	callesonne author:callesonne	feat(Normed/Algebra/Logarithm): add FormalMultilinearSeries of logarithm around `1`	This PR adds the `FormalMultilinearSeries` corresponding to `log` around `1` (or rather, corresponding to `log(1 + x)`. For now, this PR just adds the definition, and copies over as many (easy) results as possible from the corresponding exponential file. In a follow up PR, we will add a criterion for when the logarithm converges on the unit disk (based on the growth of the inverse norms of naturals in the given algebra), and show that this holds for any Q_p algebra. This work has been done as part of the workshop "Formalizing Class Field Theory" in Oxford. Since much of this is copy-pasting the Exponential file, I have kept Anatole Dedecker and Eric Wieser as coauthors. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP	311/0	Mathlib/Analysis/Normed/Algebra/Logarithm.lean	1	1	['github-actions']	nobody	71-38146 2 months ago	71-38484 2 months ago	0-29 29 seconds
26393	winstonyin author:winstonyin	feat: solutions to $C^n$ vector fields are $C^n$ in time	I prove that solutions to $C^n$ vector fields are also $C^n$ in time, where $n ≤ \infty$. This PR continues the work from #21286. --- - [x] depends on: #26392 [technically only depends on #26382 but I'm writing these as incremental PRs] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics t-analysis awaiting-author	93/2	Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/ODE/PicardLindelof.lean	2	19	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'winstonyin']	grunweg assignee:grunweg	70-64924 2 months ago	70-64924 2 months ago	2-8489 2 days
27434	plp127 author:plp127	test: `AlgEquiv.inv_apply`	For testing a new `@[simp]` lemma. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	20/1	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/FieldTheory/KrullTopology.lean	4	6	['eric-wieser', 'github-actions', 'plp127']	nobody	70-56330 2 months ago	71-38610 2 months ago	0-0 0 seconds
21915	YaelDillies author:YaelDillies	feat: simproc for `Int.divisorsAntidiag`	Co-authored-by: Paul Lezeau --- - [x] depends on: #21912 - [x] depends on: #21991 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta WIP	73/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/DivisorsAntidiag.lean	3	8	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	70-45377 2 months ago	70-45396 2 months ago	0-260 4 minutes
26196	adomani author:adomani	fix: silence commandStart on attribute	This is only a temporary fix, the linter should be able to ignore more granularly individual attributes. Note: this PR is prompted by "future" changes to mathlib and may not be needed after all! See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/commandStart.20linter.20broken.20with.20.60grind.60/with/524980336) and also [#mathlib4 > `grind` is available. What should Mathlib users expect? @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60grind.60.20is.20available.2E.20What.20should.20Mathlib.20users.20expect.3F/near/526547091) and [lean4#9128](https://github.com/leanprover/lean4/pull/9128) that should be the final attempt to resolve pretty-printing of `grind`, instead of silencing the linter. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter	9/0	Mathlib/Tactic/Linter/CommandStart.lean,MathlibTest/CommandStart.lean	2	3	['adomani', 'github-actions', 'grunweg']	kim-em assignee:kim-em	70-14495 2 months ago	105-74539 3 months ago	0-0 0 seconds
27507	grunweg author:grunweg	wip(commandStart): check the indentation of declaration keywords also	Check that e.g. a `lemma` keyword always starts on column 1 (unless preceded by an attribute). --- TODO: - make this work for other declarations also - the position reported for the lemma column is not helpful (it might be the absolute column in the file, but that's missing line information) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter WIP	84/1	Mathlib/Tactic/Linter/CommandStart.lean,MathlibTest/CommandStart.lean	2	2	['github-actions', 'grunweg']	nobody	69-55379 2 months ago	69-55450 2 months ago	0-2 2 seconds
26594	metakunt author:metakunt	feat(Algebra/Polynomial/ZMod): Add Polynomial.equiv_of_nat_of_polynomial_zmod	This adds an explicit bijection between the naturals and $$\mathbb{Z}/n\mathbb{Z}[X]$$ in a canonical way. --- I feel that some API is missing to make the theorem shorter, I have no idea what lemmas to extract though. Also I don't know when to use spaces and when not, so I did it best effort.	new-contributor t-algebra awaiting-author label:t-algebra$	465/0	Mathlib.lean,Mathlib/Algebra/Polynomial/ZMod.lean	2	2	['Ruben-VandeVelde', 'github-actions']	nobody	69-24963 2 months ago	69-24963 2 months ago	25-6199 25 days
25945	adomani author:adomani	feat: the empty line in commands linter	This linter flags empty lines within a command. It allows empty lines within doc-strings, module-docs and a couple of other "sensible" places. It also skips files that are likely to contain meta-code, since there the use of empty lines in definition is more widespread. This PR continues the work from #25236.	large-import t-linter maintainer-merge awaiting-author	375/7	Mathlib.lean,Mathlib/Analysis/Meromorphic/FactorizedRational.lean,Mathlib/CategoryTheory/Comma/StructuredArrow/CommaMap.lean,Mathlib/Init.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/EmptyLine.lean,MathlibTest/EmptyLine.lean	8	12	['adomani', 'bryangingechen', 'eric-wieser', 'github-actions']	bryangingechen assignee:bryangingechen	67-43692 2 months ago	67-43692 2 months ago	42-26074 42 days
22464	adomani author:adomani	feat(CI): declarations diff in Lean	Rewrites the `declaration_diff` script in Lean. You can see the effect of the new script in the testing branch #22497. The new CI step runs in approximately 5mins, but is separate from the `build` step. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI awaiting-author	151/0	.github/workflows/PR_summary_lean.yml,scripts/README.md,scripts/declarations_diff.lean,scripts/declarations_diff_lean_shell_glue.sh	4	7	['bryangingechen', 'github-actions', 'grunweg', 'j-loreaux']	robertylewis assignee:robertylewis	67-11020 2 months ago	67-11020 2 months ago	146-23504 146 days
27422	vihdzp author:vihdzp	feat: relate images to pointwise negation/inverses	These lemmas kept coming up in the CGT repo. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-algebra awaiting-author label:t-algebra$	13/0	Mathlib/Algebra/Group/Pointwise/Set/Basic.lean	1	7	['YaelDillies', 'github-actions', 'vihdzp']	nobody	66-84676 2 months ago	66-84676 2 months ago	4-29607 4 days
26307	j-loreaux author:j-loreaux	refactor: make `IsIdempotentElem` a one-field structure	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	29/22	Mathlib/Algebra/Group/Idempotent.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/GroupWithZero/Idempotent.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Ring/Idempotent.lean	5	1	['github-actions']	nobody	66-29917 2 months ago	102-40457 3 months ago	0-0 0 seconds
27677	jkpjkpjkp author:jkpjkpjkp	extend tactic `observe` as syntax sugar for `grind`	--- The `observe` tactic now attempts to use the `grind` tactic as a fallback when library search (exact?) fails. cc. https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/.22Missing.20Tactics.22.20list/near/531764184 this drafty version does not update doc or `observe?`, as details and decisions may need further discussion.	new-contributor t-meta	31/8	Mathlib/Tactic/Observe.lean	1	2	['euprunin', 'github-actions']	nobody	64-23595 2 months ago	65-56843 2 months ago	0-0 0 seconds
27297	hugh-fox author:hugh-fox	feat: add an equality between sums and products of cartesian products	Adds `prod_mul_eq_prod_product` and a version for Finsets `prod_range_mul_eq_prod_product` with to show an equality between `Fin (i * j)` and `Fin a × Fin b`. It is likely `prod_range_mul_eq_prod_product` belongs in a different file, in which case only the first commit should be considered. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	12/0	Mathlib/Algebra/BigOperators/Fin.lean	1	6	['Ruben-VandeVelde', 'github-actions', 'hugh-fox', 'j-loreaux', 'kckennylau']	nobody	65-25487 2 months ago	69-17475 2 months ago	7-6727 7 days
25864	plp127 author:plp127	feat(Nat/Digits): use fuel in `Nat.digits`	Add a `fuel` parameter to `Nat.digitsAux` to make it structurally recursive. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	47/14	Mathlib/Data/Nat/Digits/Defs.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	ericrbg assignee:ericrbg	65-25025 2 months ago	76-15701 2 months ago	96-62251 96 days
27704	vihdzp author:vihdzp	feat: link `Minimal` and `IsLeast` together	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	24/0	Mathlib/Order/Bounds/Basic.lean	1	3	['b-mehta', 'github-actions']	nobody	64-49792 2 months ago	64-49792 2 months ago	0-52136 14 hours
14237	js2357 author:js2357	feat: Define the localization of a fractional ideal at a prime ideal	Define the localization of a fractional ideal at a prime ideal, and prove some basic properties. --- This PR is part 3 out of 4 of a proof of `isDedekindDomain_iff_isDedekindDomainDvr`. Part 4 is available here: #14242 - [x] depends on: #14099 Part 1 - [x] depends on: #14216 Part 2 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	230/0	Mathlib.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean	3	21	['Vierkantor', 'YaelDillies', 'github-actions', 'js2357', 'kbuzzard', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	Vierkantor assignee:Vierkantor	64-35289 2 months ago	64-35321 2 months ago	26-39463 26 days
27756	grunweg author:grunweg	feat: `Weak(Pseudo)EMetricSpace`, generalises `(Pseudo)EMetricSpace`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson t-topology WIP	142/36	Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean	2	1	['github-actions']	nobody	64-18202 2 months ago	64-39771 2 months ago	0-2 2 seconds
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	64-15496 2 months ago	82-61823 2 months ago	82-61843 82 days
25989	Multramate author:Multramate	feat(NumberTheory/EllipticDivisibilitySequence): add elliptic nets	This PR continues the work from #25030. Original PR: https://github.com/leanprover-community/mathlib4/pull/25030	t-number-theory awaiting-author	259/37	Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	1	8	['MichaelStollBayreuth', 'Multramate', 'github-actions', 'tb65536']	tb65536 assignee:tb65536	64-14672 2 months ago	64-14672 2 months ago	45-1019 45 days
27813	javra author:javra	feat: IMO 2025 Q1	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO WIP	882/0	Archive/Imo/Imo2025Q1.lean	1	1	['github-actions']	nobody	63-53573 2 months ago	63-54771 2 months ago	0-14 14 seconds
22366	kim-em author:kim-em	feat: `check_equalities` tactic for diagnosing defeq problems	The `check_equalities` tactic, which checks the typing of equalities in the goal, reporting discrepancies between the implicit type argument of the equality, and the inferred types of the left and right hand sides, at "instances and reducible" transparency. Reports from this tactic do not necessarily indicate a problem, although typically `simp` should reduce rather than increase the reported discrepancies. `check_equalities` may be useful in diagnosing uses of `erw`.	t-meta delegated	118/3	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/CategoryTheory/CheckCompositions.lean,Mathlib/Tactic/CheckEqualities.lean,Mathlib/Tactic/Common.lean,MathlibTest/check_equalities.lean	7	16	['adomani', 'b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'kim-em', 'mathlib-bors']	nobody	63-48709 2 months ago	203-41278 6 months ago	15-14325 15 days
27683	dupuisf author:dupuisf	feat: grind tags for set operations	This PR adds `grind` tags for various set operations (union, intersection, complement, etc). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	29/9	Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Operations.lean	2	4	['dupuisf', 'euprunin', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	63-42709 2 months ago	63-42739 2 months ago	65-15821 65 days
27753	YunkaiZhang233 author:YunkaiZhang233	feat(CategoryTheory): implemented proofs for factorisation categories being equivalent to iterated comma categories in two ways	--- Completed one of the tasks in TODOs, shown and implemented the details for (X/C)/f ≌ Factorisation f ≌ f/(C/Y). This is migrated from my previous PR #22390 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	70/1	Mathlib/CategoryTheory/Category/Factorisation.lean	1	12	['YunkaiZhang233', 'b-mehta', 'github-actions', 'robin-carlier']	nobody	63-42690 2 months ago	64-38571 2 months ago	0-3448 57 minutes
25481	kbuzzard author:kbuzzard	chore: refactor Algebra.TensorProduct.rightAlgebra	The declaration `Algebra.TensorProduct.rightAlgebra` makes `A ⊗[R] B` into a `B`-algebra (here `R` is a `CommSemiring`, `A` is a `Semiring` and an `R`-algebra, and `B` is a `CommSemiring` and an `R`-algebra). It is not an instance because if A = B it causes a diamond. However in the many cases where A isn't B, it can occasionally be useful. However one could imagine that in the many cases where an R-module `M` also isn't `B`, it might occasionally be useful to make `M ⊗[R] B` into a `B`-module (and indeed I am finding this in FLT). With the current definition of `Algebra.TensorProduct.rightAlgebra` this is difficult to do without causing diamonds in the case when `M` happens to be an `R`-algebra (by which I mean "I failed to do this in finite time"). One fix for this is just to redefine `Algebra.TensorProduct.rightAlgebra` so that the `smul` field is ``` smul b ab := TensorProduct.comm _ _ _ (b • (TensorProduct.comm _ _ _ ab)) ``` i.e. literally "swap the product around, use mathlib's instance making `B ⊗[R] A` into a `B`-algebra, and then swap back". Then the same definition can be used to make `M ⊗[R] B` into a `B`-module and on the odd occasion where this point of view is useful, there is no diamond. This is what we do in this PR. After adding one simp lemma there is no breakage at all in mathlib. Furthermore, for those who have observed that we want to build on this algebra instance sometimes and, for example, add instances of the form "if M is finite over R then M ⊗[R] B is finite over B" -- these instances are really easy to add now with this new definition, because you simply pull back the analogous finite left module instance along the isomorphism M ⊗[R] B = B ⊗[R] M. Examples (from FLT, where the right action is put in a scope): ``` scoped instance [Module.Finite R M] : Module.Finite A (M ⊗[R] A) := Module.Finite.equiv (Module.TensorProduct.comm R A M) scoped instance [Module.Free R M] : Module.Free A (M ⊗[R] A) := Module.Free.of_equiv (Module.TensorProduct.comm R A M) ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	33/6	Mathlib/RingTheory/TensorProduct/Basic.lean	1	7	['adomani', 'github-actions', 'kbuzzard', 'leanprover-bot', 'mathlib-bors']	adomani assignee:adomani	63-40902 2 months ago	63-48031 2 months ago	56-85445 56 days
27826	Louddy author:Louddy	feat(Subsemiring): mk_eq_zero	Add a `mk_eq_zero` lemma for `Subsemiring`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	4/0	Mathlib/Algebra/Ring/Subsemiring/Defs.lean	1	3	['Louddy', 'eric-wieser', 'github-actions']	nobody	63-35055 2 months ago	63-38137 2 months ago	0-8982 2 hours
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	63-5858 2 months ago	94-13598 3 months ago	113-64174 113 days
27050	BoltonBailey author:BoltonBailey	doc(Control/Monad/Cont): add docstrings	Split of #25917. Adds docstrings to this file. Note: this documentation was written by asking Cursor (Claude 3.5 sonnet) to write the docstrings. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	183/0	Mathlib/Control/Monad/Cont.lean	1	8	['BoltonBailey', 'eric-wieser', 'github-actions']	nobody	62-83983 2 months ago	82-15266 2 months ago	0-85623 23 hours
25916	BoltonBailey author:BoltonBailey	feat: add `simp` lemma `coeff_eq_zero_of_not_mem_support`	Adds the forward direction of `not_mem_support_iff` as a simp lemma. Original PR: https://github.com/leanprover-community/mathlib4/pull/13026	t-algebra awaiting-author label:t-algebra$	4/0	Mathlib/Algebra/MvPolynomial/Basic.lean	1	2	['BoltonBailey', 'github-actions']	nobody	62-38707 2 months ago	110-39593 3 months ago	0-8 8 seconds
27225	eric-wieser author:eric-wieser	refactor(Tactic/Lift): deprecate the third with argument	We already have a number of tactics where the clearing happens all the time, and you have to opt out with `id h`. This also fixes a bug where `lift z to Nat with n hn this_is_unused` would silently ignore `this_is_unused`. --- - [ ] depends on: #27223 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	21/9	Mathlib/Tactic/Lift.lean,MathlibTest/lift.lean	2	8	['JovanGerb', 'adomani', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'vihdzp']	JovanGerb assignee:JovanGerb	62-1074 2 months ago	62-47974 2 months ago	15-64386 15 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	61-5832 2 months ago	108-7573 3 months ago	108-7611 108 days
27703	vihdzp author:vihdzp	feat: `le_of_forall_ne`	This form of `le_of_forall_lt` is a bit nicer when working with nimbers; they're minimum excludents, so to prove `a ≤ b` you have to prove `b` can't be equal to any smaller `a`! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order easy awaiting-author	7/0	Mathlib/Order/Basic.lean	1	6	['JovanGerb', 'eric-wieser', 'github-actions']	nobody	61-5220 2 months ago	61-11105 2 months ago	4-6136 4 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	60-59234 1 month ago	60-59234 1 month ago	101-68639 101 days
26341	mans0954 author:mans0954	feat(LinearAlgebra/QuadraticForm/Basis): Free Tensor product of Quadratic Maps	This PR continues the work from #19432. Original PR: https://github.com/leanprover-community/mathlib4/pull/19432	large-import t-algebra WIP label:t-algebra$	888/0	Mathlib.lean,Mathlib/Data/Sym/Sym2/Prod.lean,Mathlib/LinearAlgebra/QuadraticForm/Basis.lean	3	n/a	['github-actions', 'mans0954']	nobody	60-59225 1 month ago	unknown	unknown
26340	mans0954 author:mans0954	feat(Algebra/Module/NestAlgebra): Nest algebras	This PR continues the work from #18705. Original PR: https://github.com/leanprover-community/mathlib4/pull/18705	t-algebra label:t-algebra$	184/0	Mathlib.lean,Mathlib/Algebra/Module/NestAlgebra.lean,Mathlib/Order/Nest.lean,Mathlib/Order/Preorder/Chain.lean,docs/references.bib	5	2	['github-actions', 'mans0954']	nobody	60-59221 1 month ago	60-59221 1 month ago	101-70150 101 days
26298	adomani author:adomani	test: the commandStart linter only acts on modified files.	Test for #26299: should flag issues in the new file and also in the modified file `Mathlib/Data/Array/Extract.lean`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter awaiting-author WIP	63/1	Mathlib.lean,Mathlib/Data/Array/Extract.lean,Mathlib/New.lean,Mathlib/Tactic/Linter/CommandStart.lean	4	20	['adomani', 'bryangingechen', 'github-actions']	nobody	60-59182 1 month ago	60-59183 1 month ago	0-0 0 seconds
25992	Multramate author:Multramate	feat(RingTheory/Ideal/Span): add pair lemmas	This PR continues the work from #25323. Original PR: https://github.com/leanprover-community/mathlib4/pull/25323	t-ring-theory awaiting-author	131/31	Mathlib/Algebra/Module/PID.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Span.lean	5	9	['Multramate', 'Ruben-VandeVelde', 'github-actions']	nobody	60-59143 1 month ago	60-59143 1 month ago	39-76045 39 days
25986	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/NumberField/Height): define heights on Weierstrass curves	This PR continues the work from #15786. Original PR: https://github.com/leanprover-community/mathlib4/pull/15786	t-algebraic-geometry	650/0	Mathlib/AlgebraicGeometry/EllipticCurve/NumberField/Height.lean	1	2	['Multramate', 'github-actions']	nobody	60-59131 1 month ago	60-59131 1 month ago	0-0 0 seconds
26342	mans0954 author:mans0954	WiP: Expansion of the tensor product of quadratic maps over a linear combination	This PR continues the work from #19806. Original PR: https://github.com/leanprover-community/mathlib4/pull/19806	t-algebra WIP label:t-algebra$	483/0	Mathlib/Data/Sym/Sym2/Prod.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/Basis.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct.lean	4	n/a	['github-actions', 'mans0954']	nobody	60-59069 1 month ago	unknown	unknown
26158	upobir author:upobir	feat(NumberTheory/Divisors): add int divisors	This PR continues the work from #25209. Original PR: https://github.com/leanprover-community/mathlib4/pull/25209	t-number-theory awaiting-author	101/4	Mathlib/NumberTheory/Divisors.lean	1	36	['MichaelStollBayreuth', 'github-actions', 'upobir']	mariainesdff assignee:mariainesdff	60-44517 1 month ago	60-44517 1 month ago	46-1067 46 days
26483	metakunt author:metakunt	feat (RingTheory/RootsOfUnity/PrimitiveRoots) : Add equiv_primitiveRoots_of_coprimePow	Adds equivalence of r-th primitive roots by a coprime e.	t-ring-theory new-contributor awaiting-author	79/0	Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean	1	13	['Citronhat', 'Ruben-VandeVelde', 'github-actions', 'metakunt']	nobody	59-61391 1 month ago	59-61391 1 month ago	28-81831 28 days
26386	jjdishere author:jjdishere	feat(RingTheory/Perfection): lemmas for `frobeniusEquiv.symm`	This PR continues the work from #22330. Original PR: https://github.com/leanprover-community/mathlib4/pull/22330	t-ring-theory	321/5	Mathlib.lean,Mathlib/Algebra/Ring/Aut.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Perfectoid/Untilt.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/RingTheory/WittVector/Complete.lean,Mathlib/RingTheory/WittVector/TeichmullerSeries.lean	8	7	['eric-wieser', 'github-actions', 'jjdishere']	nobody	59-61331 1 month ago	59-61331 1 month ago	100-84580 100 days
26368	Whysoserioushah author:Whysoserioushah	feat(RingTheory/TwoSidedIdeal/SpanAsSum): span of set as finsum	Co-authored-by: Jujian Zhang --- Reopened after everything moved to fork (#23320). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	81/0	Mathlib.lean,Mathlib/RingTheory/TwoSidedIdeal/SpanAsSum.lean	2	5	['github-actions', 'kckennylau']	YaelDillies assignee:YaelDillies	59-61307 1 month ago	59-61307 1 month ago	37-40835 37 days
26387	jjdishere author:jjdishere	feat(RingTheory/WittVector): the Teichmuller series	This PR continues the work from #22320. Original PR: https://github.com/leanprover-community/mathlib4/pull/22320	t-ring-theory awaiting-author	204/2	Mathlib.lean,Mathlib/Algebra/Ring/Aut.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/RingTheory/WittVector/Complete.lean,Mathlib/RingTheory/WittVector/TeichmullerSeries.lean	6	2	['github-actions', 'jjdishere']	nobody	59-61264 1 month ago	59-61264 1 month ago	0-87 1 minute
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	59-61178 1 month ago	59-61178 1 month ago	108-29890 108 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	59-61072 1 month ago	59-61072 1 month ago	146-18122 146 days
14733	jjaassoonn author:jjaassoonn	feat(RingTheory/Flat/CategoryTheory): a module is flat iff tensoring preserves finite limits	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	99/1	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/RightExact.lean,Mathlib/RingTheory/Flat/CategoryTheory.lean	4	2	['github-actions', 'kim-em']	nobody	59-60905 1 month ago	59-60905 1 month ago	6-6256 6 days
14727	jjaassoonn author:jjaassoonn	feat(RingTheory/Flat/CategoryTheory): a flat module has vanishing higher Tor groups	[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	37/1	Mathlib/RingTheory/Flat/CategoryTheory.lean	1	3	['github-actions', 'kim-em']	nobody	59-60893 1 month ago	59-60893 1 month ago	3-28223 3 days
27309	kckennylau author:kckennylau	feat(CategoryTheory): a presheaf on `CostructuredArrow F d` can be extended to a presheaf on `C`	--- Depends on: * [ ] #27321 Zulip: [#Is there code for X? > over category via a functor](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/over.20category.20via.20a.20functor/with/529574191) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory WIP	218/0	Mathlib.lean,Mathlib/CategoryTheory/Comma/Presheaf/LeftExtension.lean	2	3	['erdOne', 'github-actions', 'robin-carlier']	erdOne assignee:erdOne	59-57607 1 month ago	59-57628 1 month ago	15-69033 15 days
27976	smmercuri author:smmercuri	feat: `ramificationIdx` for `NumberField.InfinitePlace`	This PR continues the work from #24884. Original PR: https://github.com/leanprover-community/mathlib4/pull/24884	t-number-theory WIP	22/0	Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	1	1	['github-actions']	nobody	59-57393 1 month ago	59-57405 1 month ago	0-57 57 seconds
27417	PierreQuinton author:PierreQuinton	feat: add `SigmaCompleteLattice`	A $\sigma$-complete lattice is a lattice in which every countable subset `s` has a least upper bound and a greatest lower bound, denoted below by `sSup s` and `sInf s`. This PR adds the classes `SigmaCompleteLattice` as well as some theorems (mainly adapted from `CompleteLattice` and `ConditionallyCompleteLattice`). This is an adaptation of #26318 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	394/0	Mathlib.lean,Mathlib/Order/SigmaCompleteLattice.lean	2	8	['PierreQuinton', 'YaelDillies', 'github-actions', 'vihdzp']	YaelDillies assignee:YaelDillies	59-35884 1 month ago	59-35884 1 month ago	12-33338 12 days
28032	grunweg author:grunweg	feat: support Partial{Homeomorph,Equiv} in differential geometry elaborators	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	852/0	Mathlib.lean,Mathlib/Geometry/Manifold/Elaborators.lean,Mathlib/Geometry/Manifold/Traces.lean,MathlibTest/DifferentialGeometry/Elaborators.lean,scripts/noshake.json	5	1	['github-actions']	nobody	58-59867 1 month ago	58-59867 1 month ago	58-59927 58 days
23669	erdOne author:erdOne	feat(FieldTheory): abelian extensions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	74/0	Mathlib.lean,Mathlib/FieldTheory/Galois/Abelian.lean,Mathlib/NumberTheory/Cyclotomic/Gal.lean	3	16	['acmepjz', 'alreadydone', 'chrisflav', 'erdOne', 'github-actions', 'mathlib-bors', 'riccardobrasca', 'xroblot']	riccardobrasca assignee:riccardobrasca	58-48886 1 month ago	87-53126 2 months ago	29-68817 29 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	58-5846 1 month ago	91-17324 2 months ago	91-17360 91 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	57-5845 1 month ago	64-41894 2 months ago	91-29730 91 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	56-56022 1 month ago	68-39319 2 months ago	68-39345 68 days
28075	tristan-f-r author:tristan-f-r	chore(Finsupp/Indicator): make non-classical	This was surprising to see on a data-carrying definition. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data easy awaiting-author	11/9	Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Indicator.lean	2	3	['github-actions', 'ocfnash', 'tristan-f-r']	nobody	56-19481 1 month ago	56-63300 1 month ago	0-85904 23 hours
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	56-5864 1 month ago	90-67481 2 months ago	112-25840 112 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	56-5856 1 month ago	65-82268 2 months ago	65-82254 65 days
27525	Hagb author:Hagb	(WIP) feat(Tactic/Linter/Indentation): add a linter for general indentation	--- todo: - [x] check whether some (direct or indirect) children of some kinds of parents are intended _strictly_ deeper than this parent. For example: ```lean example : Nat := Nat.add 1 -- should be strictly deeper than `Nat.add`? 2 ``` - [ ] check whether some (direct or indirect) children of some kinds of parents are intended exactly N spaces deeper than this parent. For example: ```lean example : True := trivial -- should be exact 2 spaces deeper than 0 space of `example` ``` - [ ] some special cases, such as `calc`. https://github.com/leanprover-community/mathlib4/blob/5ebccb65951c70539ba1c36e53e079ac28b3fd23/Mathlib/Geometry/Manifold/Riemannian/Basic.lean#L452-L454 - [ ] add test cases [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter WIP	1364/1	Mathlib/Init.lean,Mathlib/Tactic/Linter/Indentation.lean,Mathlib/Tactic/Linter/Indentation/Basic.lean,Mathlib/Tactic/Linter/Indentation/Defs.lean,Mathlib/Tactic/Linter/Indentation/Linters.lean,MathlibTest/IndentationLinter.lean,lakefile.lean	7	13	['Hagb', 'github-actions', 'grunweg']	nobody	55-22183 1 month ago	60-22440 1 month ago	0-0 0 seconds
28168	astrainfinita author:astrainfinita	feat: hensel's lemma for topological rings	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra t-topology WIP label:t-algebra$	616/0	Mathlib/RingTheory/Polynomial/Hensel.lean	1	1	['github-actions']	nobody	55-4916 1 month ago	55-4926 1 month ago	0-0 0 seconds
23758	erdOne author:erdOne	feat(Topology/Algebra): linearly topologized iff non-archimedean	...for topological modules over compact rings or `ℤ`-finite rings --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra t-topology awaiting-author label:t-algebra$	138/3	Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/Topology/Algebra/LinearTopology.lean	2	21	['ADedecker', 'AntoineChambert-Loir', 'erdOne', 'github-actions', 'grunweg']	ADedecker and AntoineChambert-Loir assignee:AntoineChambert-Loir assignee:ADedecker	54-79114 1 month ago	54-79114 1 month ago	124-78308 124 days
26901	5hv5hvnk author:5hv5hvnk	feat: a simproc version of `compute_degree`	Wrap `compute_degree` in a simproc for use by simp. Closes #22219. ---	new-contributor awaiting-CI t-meta awaiting-author	198/0	Mathlib.lean,Mathlib/Tactic/Simproc/PolynomialDegree.lean,MathlibTest/polynomial_degree_simproc.lean	3	18	['5hv5hvnk', 'YaelDillies', 'adomani', 'github-actions']	nobody	53-54809 1 month ago	53-54809 1 month ago	2-71043 2 days
27850	fyqing author:fyqing	feat: 0-dimensional manifolds are discrete and countable	This is the converse direction of the classification of 0-dimensional manifolds. The other direction was shown in #22105. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-differential-geometry awaiting-author	80/0	Mathlib.lean,Mathlib/Geometry/Manifold/ZeroDim.lean	2	13	['fyqing', 'github-actions', 'grunweg', 'tb65536']	grunweg assignee:grunweg	53-52417 1 month ago	63-13233 2 months ago	0-6418 1 hour
27444	grunweg author:grunweg	feat: generalise more lemmas to enorms	The selection of lemmas may seem eclectic, but follows a clear path: I'm working on generalising the last section of `IntegrableOn.lean` to enorms. (This will be continued in a later PR.) --- Commits can be reviewed independently. - [x] depends on: #27419 (first commits) - [x] depends on: #27456 (last commits) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson WIP	10/0	Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean	1	3	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	53-37977 1 month ago	53-38013 1 month ago	0-1886 31 minutes
26351	RemyDegenne author:RemyDegenne	feat: covering and packing numbers of sets in a metric space	We define covering numbers of sets in a pseudo-metric space, which are minimal cardinalities of `ε`-covers of sets. We also define the packing number, which is the maximal cardinality of an `ε`-separated set. From the Brownian motion project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	261/0	Mathlib.lean,Mathlib/Topology/MetricSpace/CoveringNumbers.lean	2	9	['ADedecker', 'RemyDegenne', 'YaelDillies', 'github-actions', 'j-loreaux']	j-loreaux assignee:j-loreaux	53-36289 1 month ago	56-23095 1 month ago	45-38108 45 days
27708	vihdzp author:vihdzp	feat: unions and intersections of ordinals are ordinals	As well as a bonus result `IsTransitive.empty_mem`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory awaiting-author	58/16	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Ordinal.lean	2	4	['alreadydone', 'b-mehta', 'github-actions', 'vihdzp']	alreadydone assignee:alreadydone	53-5877 1 month ago	53-5877 1 month ago	12-2927 12 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	53-5862 1 month ago	115-79572 3 months ago	131-25099 131 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	53-5857 1 month ago	84-44984 2 months ago	84-45028 84 days
27226	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): Add Subgraph.inclusion_edge_apply_coe and inclusion_edgeSet_apply_coe	This PR continues the work from #25248. Original PR: https://github.com/leanprover-community/mathlib4/pull/25248	new-contributor t-combinatorics awaiting-author	14/0	Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	1	3	['b-mehta', 'github-actions', 'xcloudyunx']	b-mehta assignee:b-mehta	52-80204 1 month ago	53-7884 1 month ago	25-83942 25 days
22925	ggranberry author:ggranberry	feat(Mathlib/PlaceHolder/ToeplitzHausdorff): Toeplitz-Hausdorff	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	will-close-soon new-contributor t-analysis awaiting-author WIP help-wanted	411/0	Mathlib/PlaceHolder/ToeplitzHausdorff.lean,Mathlib/PlaceHolder/ToeplitzHausdorff_v2.lean	2	11	['faenuccio', 'ggranberry', 'github-actions']	faenuccio assignee:faenuccio	51-56328 1 month ago	51-56531 1 month ago	4-24257 4 days
27180	ADedecker author:ADedecker	feat: quotient of a monoid with zero by a multiplicative congruence	--- My motivation is getting a more conceptual construction of [ValuativeRel.ValueGroupWithZero](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Valuation/ValuativeRel.html#ValuativeRel.ValueGroupWithZero), but I think this is of independent interest. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	141/26	Mathlib.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/GroupWithZero.lean	5	31	['ADedecker', 'eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	ocfnash assignee:ocfnash	51-49485 1 month ago	51-62693 1 month ago	28-12053 28 days
21031	YaelDillies author:YaelDillies	chore: get rid of generic hom coercions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	161/166	Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/RingTheory/Valuation/Basic.lean	13	13	['Vierkantor', 'YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	51-23396 1 month ago	51-23458 1 month ago	0-17 17 seconds
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	51-5848 1 month ago	64-40604 2 months ago	64-40650 64 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	50-5833 1 month ago	59-60518 1 month ago	60-25991 60 days
26125	faenuccio author:faenuccio	first commit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	dependency-bump WIP	56/1	Hammer/experiment1.lean,lake-manifest.json,lakefile.lean	3	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	49-65193 1 month ago	49-65193 1 month ago	0-19 19 seconds
27974	smmercuri author:smmercuri	feat: `Field`, `FiniteDimensional` and `Algebra.IsSeparable` instances for `WithAbs`	This PR continues the work from #24870. Original PR: https://github.com/leanprover-community/mathlib4/pull/24870	large-import t-analysis awaiting-author	14/1	Mathlib/Analysis/Normed/Field/WithAbs.lean	1	2	['github-actions', 'j-loreaux']	j-loreaux assignee:j-loreaux	48-78165 1 month ago	48-78165 1 month ago	10-66566 10 days
27196	YaelDillies author:YaelDillies	refactor(Polynomial/Bivariate): swap `X` and `Y` for improved notation	This way, `X` keeps on being `X`. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra WIP label:t-algebra$	3/3	Mathlib/Algebra/Polynomial/Bivariate.lean	1	3	['YaelDillies', 'alreadydone', 'github-actions']	nobody	48-50343 1 month ago	63-70883 2 months ago	15-75841 15 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	48-5836 1 month ago	55-69365 1 month ago	55-69356 55 days
26349	mans0954 author:mans0954	feat(Analysis/SpecialFunctions/Trigonometric/Basic): sin and cos of multiples of π / 3	This PR continues the work from #25009. Original PR: https://github.com/leanprover-community/mathlib4/pull/25009	t-analysis help-wanted	159/0	Mathlib/Algebra/Order/Monoid/NatCast.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Data/Nat/Cast/Defs.lean,MathlibTest/trigonometry.lean	4	3	['github-actions', 'mans0954', 'themathqueen']	nobody	47-21955 1 month ago	60-59240 1 month ago	5-42837 5 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	47-5837 1 month ago	54-19073 1 month ago	54-19111 54 days
27302	tristan-f-r author:tristan-f-r	feat(Fintype/Quotient): finLiftOn₂	The combination of [`Quotient.finLiftOn`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Data/Fintype/Quotient.html#Quotient.finLiftOn) and [`liftOn₂`](https://leanprover-community.github.io/mathlib4_docs/Init/Core.html#Quotient.liftOn%E2%82%82). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	19/0	Mathlib/Data/Fintype/Quotient.lean	1	10	['github-actions', 'kckennylau', 'tristan-f-r', 'vihdzp']	nobody	46-76930 1 month ago	76-2169 2 months ago	76-2203 76 days
5897	eric-wieser author:eric-wieser	feat: add a `MonadError` instance for `ContT`	We already have a `MonadExcept` instance; this promotes it to `MonadError`. Note the issue with the existing `MonadExcept` instance still applies. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	16/0	Mathlib/Control/Monad/Cont.lean	1	25	['Vierkantor', 'YaelDillies', 'eric-wieser', 'github-actions', 'kmill']	nobody	46-54956 1 month ago	442-75670 1 year ago	339-53816 339 days
28276	eric-wieser author:eric-wieser	refactor: tidy `lift_unique` lemmas	--- - [ ] depends on: #28275 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	37/20	Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Lie/UniversalEnveloping.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/ExteriorAlgebra/Basic.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	46-54227 1 month ago	46-54246 1 month ago	0-0 0 seconds
23881	YaelDillies author:YaelDillies	feat: `ℝ≥0`-valued Lᵖ norm	This is useful when inputting the Lp norm in places that expect a real number, like an exponent. From LeanAPAP --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	218/6	Mathlib.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Defs.lean,Mathlib/MeasureTheory/Function/LpSeminorm/NNLpNorm.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean	4	20	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'sgouezel']	nobody	46-44155 1 month ago	46-44174 1 month ago	13-15316 13 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	46-5852 1 month ago	56-27544 1 month ago	57-2041 57 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	46-5850 1 month ago	53-42361 1 month ago	54-20564 54 days
25692	Whysoserioushah author:Whysoserioushah	feat(RingTheory/MatrixAlgebra): add a more general version of `matrixEquivTensor`	This adds `tensorMatrixLinearEquiv : A ⊗[R] Matrix n n B ≃ₐ[S] Matrix n n (A ⊗[R] B)` which is a more general version of `matrixEquivTensor : Matrix n n A ≃ₐ[R] (A ⊗[R] Matrix n n R)`. The latter is then implemented as a trivial consequence of the former. Many internal implementation details are deleted without deprecation, although strictly these were not private. Co-authored-by: @erdOne Co-authored-by: Eric Wieser --- - [ ] depends on: #28367 - [ ] depends on: #28359 - [ ] depends on: #28368 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	129/110	Mathlib/RingTheory/MatrixAlgebra.lean	1	27	['Whysoserioushah', 'chrisflav', 'eric-wieser', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mattrobball']	chrisflav assignee:chrisflav	45-65578 1 month ago	45-65578 1 month ago	63-50556 63 days
28631	faenuccio author:faenuccio	feat(Data\Nat\ModEq.lean): add grind attribute to ModEq	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data WIP	7/0	Mathlib/Data/Nat/ModEq.lean	1	4	['faenuccio', 'github-actions', 'leanprover-bot']	nobody	45-60609 1 month ago	45-63128 1 month ago	0-22 22 seconds
26329	Timeroot author:Timeroot	feat: Definition of `Clone` notations and typeclasses	Definitions and notation typeclasses for #20051 --- This PR continues the work from #23459. Original PR: https://github.com/leanprover-community/mathlib4/pull/23459 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI awaiting-author label:t-algebra$	100/0	Mathlib.lean,Mathlib/Algebra/Clone/Defs.lean	2	3	['Timeroot', 'YaelDillies', 'github-actions']	nobody	45-58492 1 month ago	45-58492 1 month ago	0-21917 6 hours
27752	plp127 author:plp127	feat(Order): `NoBotOrder α` implies `NoMinOrder α` under `IsDirected α (· ≥ ·)`	This PR continues the work from #24266. Original PR: https://github.com/leanprover-community/mathlib4/pull/24266	t-order awaiting-author	14/0	Mathlib/Order/Directed.lean	1	4	['github-actions', 'j-loreaux', 'plp127']	nobody	45-23468 1 month ago	45-23468 1 month ago	19-20394 19 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	45-5860 1 month ago	56-24329 1 month ago	56-24366 56 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	45-5858 1 month ago	55-30600 1 month ago	55-30643 55 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	45-5857 1 month ago	54-37187 1 month ago	54-37227 54 days
24514	b-mehta author:b-mehta	chore(Int/GCD): use fuel in xgcd	Modify the definition of xgcd to use fuel recursion, to allow it to be reduced in the kernel. As a consequence, this means the evaluation of field operations in ZMod p become provable by `rfl` and `decide`. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/opaque.20recursion.20definitions.20break.20mergeSort.20decidability --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	44/22	Mathlib/Data/Int/GCD.lean	1	5	['astrainfinita', 'b-mehta', 'eric-wieser', 'github-actions', 'nomeata', 'urkud']	nobody	44-66302 1 month ago	97-8999 3 months ago	58-34020 58 days
26645	erdOne author:erdOne	feat(RingTheory/PowerSeries): Construction of `Q` such that `P(Q(X)) = X`	Co-authored-by: Junnosuke Koizumi Co-authored-by: Hyeon, Seung-Hyeon Co-authored-by: Yuichiro Taguchi This contribution was created as part of the ZMC conference 2025 "Anabelian Geometry and its Computer Formalization". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	133/0	Mathlib/RingTheory/PowerSeries/Substitution.lean	1	9	['chrisflav', 'erdOne', 'github-actions', 'kckennylau']	kbuzzard assignee:kbuzzard	44-66132 1 month ago	44-66132 1 month ago	48-29860 48 days
28680	vihdzp author:vihdzp	feat: set has cardinality one iff singleton	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory easy awaiting-author	11/1	Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Defs.lean	2	5	['b-mehta', 'github-actions', 'kckennylau']	nobody	44-46493 1 month ago	44-46493 1 month ago	0-24645 6 hours
26243	DavidLedvinka author:DavidLedvinka	feat(Topology): Add PairReduction.lean	Add file PairReduction.lean which proves the theorem `pair_reduction` which is needed for the proof of the general Kolmogorov-Chentsov theorem in the Brownian Motion project. Co-authored-by: @RemyDegenne - [x] depends on: #27239	t-topology awaiting-author	424/0	Mathlib.lean,Mathlib/Topology/EMetricSpace/PairReduction.lean	2	76	['DavidLedvinka', 'EtienneC30', 'RemyDegenne', 'github-actions', 'mathlib4-dependent-issues-bot', 'sgouezel']	nobody	44-12611 1 month ago	50-28335 1 month ago	39-560 39 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	43-48973 1 month ago	43-48973 1 month ago	99-63452 99 days
26078	kckennylau author:kckennylau	feat(AlgebraicGeometry): add x, y, px, py for points on elliptic curves	--- Split from #25218. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry awaiting-author	44/0	Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean	1	12	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'dagurtomas', 'github-actions', 'kckennylau']	dagurtomas assignee:dagurtomas	43-41017 1 month ago	43-41017 1 month ago	64-11252 64 days
28422	euprunin author:euprunin	chore(Data/Fin): deprecate `Fin.mul_one'` (duplicate)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	3/8	Mathlib/Data/Fin/Basic.lean,Mathlib/Data/ZMod/Defs.lean	2	2	['eric-wieser', 'github-actions']	nobody	42-18357 1 month ago	42-18357 1 month ago	8-10801 8 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	42-5866 1 month ago	50-65202 1 month ago	50-65241 50 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	42-5863 1 month ago	49-46437 1 month ago	49-46413 49 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	41-77351 1 month 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	41-41465 1 month ago	41-41621 1 month ago	41-41654 41 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	41-38654 1 month ago	77-67100 2 months ago	77-67135 77 days
27479	iu-isgood author:iu-isgood	feat: Abel's Binomial Theorem	We have formalized Abel's Binomial Theorem as part of an REU project. There are a few remaining sorrys, but we will finish them soon. I will edit this PR message later according to community rules. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	326/0	Mathlib/Data/Nat/Choose/AbelBinomial.lean	1	28	['ElifUskuplu', 'FrankieNC', 'github-actions', 'iu-isgood']	nobody	41-38636 1 month ago	65-16533 2 months ago	0-533 8 minutes
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	41-38616 1 month ago	110-51307 3 months ago	110-51348 110 days
25700	grunweg author:grunweg	feat: lint upon uses of the `mono` tactic	suggesting to use `gcongr` instead. In general, `mono` is unmaintained, was only partially ported --- and gcongr at this point is more featureful, actively developed and has a nicer user interface. The topic was also discussed [on zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Porting.20note.3A.20Fixing.20up.20.60mono.60/with/445125798). --- TODO: update the linter wording, fix its implementation and wait until tests pass - [ ] depends on: #25698 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter RFC please-adopt	15/0	MathlibTest/DeprecatedSyntaxLinter.lean,MathlibTest/Monotonicity.lean	2	3	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	41-38281 1 month ago	41-38323 1 month ago	72-55831 72 days
28215	5hv5hvnk author:5hv5hvnk	Draft PR, for Strong and Weak connectivity for Digraphs	strong and weak connectivity in Digraphs --- Should resolve a part of issue #26771 Main additions in the PR: 1. Walks in Digraphs (Walk.lean) - Basic walk structure with start and end vertices - Support for walk operations: append, reverse, length - Support functions: getVert, copy, support 2. Walk Decompositions (WalkDecomp.lean) - takeUntil and dropUntil functions to split walks - rotate operation for loop walks - Theorems relating to walk decomposition properties 3. Subgraphs (subgraph.lean) - Subgraph structure for digraphs - Induced and spanning subgraph predicates - Lattice structure (sup, inf, top, bot) - Coercion to standalone digraphs 4. Paths (Paths.lean) - Trail, Path, Circuit, Cycle definitions - Path structure with no repeating vertices - Theorems relating different path types - Basic connectivity definitions (reachable, weakly/strongly connected) 5. Connectivity (Connected.lean) - Reachability relations and properties - Strong and weak connectivity definitions - Connected component types: - StronglyConnectedComponent - WeaklyConnectedComponent - ConnectedComponent - Component properties and equivalence relations --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics awaiting-author	1216/0	Mathlib/Combinatorics/Digraph/Connected.lean,Mathlib/Combinatorics/Digraph/Paths.lean,Mathlib/Combinatorics/Digraph/Subgraph.lean,Mathlib/Combinatorics/Digraph/Walk.lean,Mathlib/Combinatorics/Digraph/WalkDecomp.lean	5	3	['github-actions', 'grunweg']	nobody	41-37219 1 month ago	41-37219 1 month ago	12-41939 12 days
28821	yury-harmonic author:yury-harmonic	feat(SimpleGraph/Finite): add lemmas	`simpNF` complains because `*Finset` are `abbrev`s. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	24/1	Mathlib/Combinatorics/SimpleGraph/Finite.lean	1	1	['github-actions']	nobody	41-21648 1 month ago	41-21698 1 month ago	0-0 0 seconds
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	41-5832 1 month ago	48-16684 1 month ago	48-16659 48 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	41-5144 1 month ago	42-71632 1 month ago	42-71675 42 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	40-69420 1 month ago	40-69430 1 month ago	40-69461 40 days
28868	yury-harmonic author:yury-harmonic	feat(Positive): add `OfNat` instance	Also fix defeq for `Div` in the `Group` instance. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	41/13	Mathlib/Algebra/Order/Positive/Field.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Data/PNat/Defs.lean	3	2	['github-actions', 'yury-harmonic']	nobody	40-25046 1 month ago	40-27869 1 month ago	40-27908 40 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	40-5837 1 month ago	49-2185 1 month ago	49-2161 49 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	40-5834 1 month ago	51-74450 1 month ago	51-77152 51 days
24333	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): cycle graph implementation for generic vertex types	The existing `cycleGraph` implementation under Combinatorics/SimpleGraph/Circulant.lean only operates over `Fin n`. This PR implements a cycle graph implementation over any generic vertex type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics awaiting-author	187/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Cycle.lean	2	41	['IvanRenison', 'github-actions', 'vlad902']	kmill assignee:kmill	39-66695 1 month ago	39-66695 1 month ago	123-22718 123 days
28376	euprunin author:euprunin	chore(Analysis/Calculus/Deriv): golf entire `differentiableAt_comp_const_add`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	2/6	Mathlib/Analysis/Calculus/Deriv/Add.lean	1	1	['github-actions', 'loefflerd']	nobody	39-23832 1 month ago	39-23832 1 month ago	11-56866 11 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	39-5866 1 month ago	46-49415 1 month ago	48-43441 48 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	39-5863 1 month ago	49-36063 1 month ago	53-53753 53 days
27155	Pjotr5 author:Pjotr5	feat: Shearer's bound on the independence number of triangle free graphs	I added the file IndependenceNumber.lean to the Mathlib.Combinatorics.SimpleGraph.Triangle folder. It contains a proof of a theorem by Shearer on the independence number of triangle-free graphs . I was told this might be useful to add to Mathlib a Zullip thread linked [here](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Convexity.20of.20a.20specific.20function/with/510469526). I tried to comply as much as I could with the Mathlib style guide, but I realise that there is probably still a significant amount of editing to be done. For one thing: there are probably some lemmas and theorems in there that might be better suited in other files, but since this is my first PR I though I would all put it in one file before starting to edit a bunch of files. I was also advised to split up the file into multiple smaller PRs, but since everything is basically serving this one proof I could not really find a natural way to do that. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics awaiting-author	1266/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/IndependenceNumber.lean	2	9	['Pjotr5', 'github-actions', 'grunweg']	nobody	38-69663 1 month ago	41-37872 1 month ago	39-17587 39 days
24719	madvorak author:madvorak	feat(LinearAlgebra/Matrix/NonsingularInverse): inverting `Matrix` inverts its `LinearEquiv`	--- Discussion: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2324719.20cannot.20find.20home/with/517142655	t-algebra awaiting-author label:t-algebra$	10/0	Mathlib/LinearAlgebra/Matrix/NonsingularInverse.lean	1	16	['eric-wieser', 'github-actions', 'madvorak', 'ocfnash']	nobody	38-63573 1 month ago	60-45550 1 month ago	86-39206 86 days
27242	hugh-fox author:hugh-fox	feat: add Gauss-like formula for sums of digit sums	Adds `sum_digit_sum_base_pow_eq` to show a Gauss-like formula across sums of digit sums. This relies on an additional two simp lemmas, named `digits_sum_eq_self`, `digits_sum_base_mul_cancel`. Lastly, includes a specialization (which is a good bit simpler than the general formula) to base 10 named `sum_digit_sum_ten_pow_eq`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data new-contributor awaiting-author	113/0	Mathlib/Data/Nat/Digits/Lemmas.lean	1	5	['github-actions', 'hugh-fox', 'kckennylau']	nobody	38-44632 1 month ago	38-44632 1 month ago	39-41606 39 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	38-18952 1 month ago	68-57795 2 months ago	106-9713 106 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	38-18089 1 month ago	41-77798 1 month ago	42-32477 42 days
26088	grunweg author:grunweg	chore(Linter/DirectoryDependency): move forbidden directories into a JSON file	This PR continues the work from #25406. Original PR: https://github.com/leanprover-community/mathlib4/pull/25406	t-linter	387/19	Mathlib/Tactic/Linter/DirectoryDependency.lean,scripts/README.md,scripts/forbiddenDirs.json	3	3	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	37-62222 1 month ago	37-62242 1 month ago	107-13179 107 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	37-54501 1 month ago	130-11627 4 months ago	130-11672 130 days
27261	Sebi-Kumar author:Sebi-Kumar	feat(Topology): add definition for subpaths	Define subpaths as restrictions of paths to subintervals, reparameterized to have domain `[0, 1]` and possibly with a reverse of direction. Prove their basic properties. This serves as an alternative to `Path.truncate` which is useful for the explicit construction of certain homotopies, in particular regarding the concatenation of subpaths. --- To provide additional context, this is my first time contributing to Mathlib, and I am doing so as a part of the Fields Undergraduate Summer Research Program hosted at Western University. My intention for this file is for it to be used when proving that the fundamental group of the sphere is trivial (following the proof from Hatcher's "Algebraic Topology"). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology awaiting-author	146/0	Mathlib.lean,Mathlib/Topology/Subpath.lean	2	24	['ADedecker', 'FrankieNC', 'Sebi-Kumar', 'github-actions', 'themathqueen', 'wwylele']	ADedecker assignee:ADedecker	37-46072 1 month ago	43-14563 1 month ago	34-15767 34 days
26644	kckennylau author:kckennylau	feat(SetTheory/ZFC): Define the language of sets and state the ZFC axioms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory awaiting-author	381/0	Mathlib.lean,Mathlib/SetTheory/ZFC/Axioms.lean,docs/references.bib	3	49	['b-mehta', 'digama0', 'github-actions', 'kckennylau', 'leanprover-community-bot-assistant', 'staroperator', 'vihdzp']	b-mehta assignee:b-mehta	37-40387 1 month ago	40-32466 1 month ago	40-53883 40 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	37-39217 1 month ago	87-6924 2 months ago	87-6961 87 days
29030	b-mehta author:b-mehta	feat(Combinatorics): prove the Rado selection lemma	Prove the Rado selection lemma, a generic result useful to prove a variety of compactness results in combinatorics. This generalises Konig's infinity lemma, and the de Bruijn-Erdos theorem, and allows the former to be conveniently stated in the language of sets rather than categories. This is a draft PR for now, since the imports are not correct and the names need fixing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	80/0	Mathlib/Combinatorics/SimpleGraph/DeBruijnErdos.lean	1	1	['github-actions']	nobody	37-34448 1 month ago	37-34619 1 month ago	0-0 0 seconds
26648	eric-wieser author:eric-wieser	chore(TensorProduct): remove more `suppress_compilation`s	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-core-PR label:t-algebra$	3/7	Mathlib/LinearAlgebra/CliffordAlgebra/Prod.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/External.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean	3	4	['eric-wieser', 'github-actions', 'leanprover-bot']	nobody	37-34310 1 month ago	37-34310 1 month ago	3-19989 3 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	37-33493 1 month ago	145-30858 4 months ago	192-83067 192 days
25804	erdOne author:erdOne	feat: `∑ z ∈ L, ‖z - x‖⁻ʳ` converges for lattices `L`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #21673. Original PR: https://github.com/leanprover-community/mathlib4/pull/21673	t-analysis awaiting-author	319/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Group/Finset/Disjoint.lean,Mathlib/Algebra/Module/ZLattice/Summable.lean,Mathlib/Order/Disjointed.lean	4	3	['github-actions', 'wwylele']	fpvandoorn assignee:fpvandoorn	37-33301 1 month ago	37-33301 1 month ago	76-21393 76 days
28056	grunweg author:grunweg	wip: existence of Riemannian metrics	Work in progress: will require the material of #26221 (orthonormal frames), hence first be developed there. --- - [x] depends on: #26875 - [x] depends on: #28046 (just nice to have, not strictly necessary) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry WIP	785/0	Mathlib.lean,Mathlib/Geometry/Manifold/ExistsRiemannianMetric.lean,Mathlib/Geometry/Manifold/ExistsRiemannianMetric2.lean,Mathlib/Geometry/Manifold/VectorBundle/Riemannian.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	37-29101 1 month ago	37-29174 1 month ago	0-0 0 seconds
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	37-26046 1 month ago	37-26067 1 month ago	80-3149 80 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	37-5623 1 month ago	145-10238 4 months ago	211-10211 211 days
24373	YaelDillies author:YaelDillies	refactor: golf `modularCharacter`	... using the lessons learned from `distribHaarChar`. Unfortunately, the two setups can't quite be unified because we are lacking an additive version of `MulDistribMulAction`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-CI	77/45	Mathlib/MeasureTheory/Group/MeasurableEquiv.lean,Mathlib/MeasureTheory/Group/Measure.lean,Mathlib/MeasureTheory/Group/ModularCharacter.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean	5	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	36-74805 1 month ago	36-74831 1 month ago	0-0 0 seconds
24383	YaelDillies author:YaelDillies	feat: distributive Haar characters of `ℝ` and `ℂ`	Compute `distribHaarChar` in the case of the actions of `ℝˣ` on `ℝ` and of `ℂˣ` on `ℂ`. The file I'm moving was added two days ago and is not yet used in FLT. From FLT --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed FLT t-measure-probability awaiting-CI WIP	205/78	Mathlib.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Action.lean,Mathlib/Algebra/Group/Action/BigOperators.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar/Complex.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar/Real.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean	8	21	['YaelDillies', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'sgouezel']	nobody	36-74619 1 month ago	36-74642 1 month ago	8-77637 8 days
16041	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Arithmetic): `Ordinal.toNat`	A simple function sending ordinals less than `ω` to themselves, and anything else to `0`. --- - [ ] depends on: #17758 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-logic awaiting-author WIP	58/0	Mathlib/SetTheory/Ordinal/Arithmetic.lean	1	4	['github-actions', 'mathlib4-dependent-issues-bot', 'urkud', 'vihdzp']	nobody	36-56647 1 month ago	36-56649 1 month ago	54-31491 54 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	36-36055 1 month ago	45-63218 1 month ago	45-63254 45 days
25500	eric-wieser author:eric-wieser	feat: delaborators for metadata	Being able to see these is very important when debugging tactic failures. Probably these could be upstreamed, but I don't think that's a reason not to merge them here first. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta delegated awaiting-author	75/3	Mathlib/Util/Delaborators.lean,Mathlib/Util/PPOptions.lean,MathlibTest/delaborators.lean	3	18	['JovanGerb', 'Rob23oba', 'eric-wieser', 'github-actions', 'kmill', 'mathlib-bors', 'plp127']	alexjbest assignee:alexjbest	36-34017 1 month ago	36-34899 1 month ago	83-71907 83 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	36-33153 1 month ago	59-19892 1 month ago	61-20554 61 days
28441	euprunin author:euprunin	chore(GroupTheory/Perm): golf entire `mem_of_formPerm_ne_self`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory awaiting-author	2/5	Mathlib/GroupTheory/Perm/List.lean	1	2	['JonBannon', 'github-actions', 'tb65536']	tb65536 assignee:tb65536	36-30958 1 month ago	36-30958 1 month ago	13-75804 13 days
28316	eric-wieser author:eric-wieser	feat(Tactic/NormNum): better trace nodes	Comparing the infoview on the first example in the test file \| Before \| After \| \|---\|---\| \| \| \| In the after version, the extension names are all clickable. Similar to #21450. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	136/5	Mathlib.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Util/Trace.lean,MathlibTest/norm_num_trace.lean	4	19	['JovanGerb', 'eric-wieser', 'github-actions', 'kmill', 'leanprover-bot', 'mathlib-bors', 'plp127']	JovanGerb assignee:JovanGerb	35-72439 1 month ago	52-13923 1 month ago	52-13904 52 days
29072	yury-harmonic author:yury-harmonic	feat({Nat,Int}/ModEq): add lemmas	--- I'm not sure that I named these lemmas correctly. Suggestions about better names are welcome! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-zulip	171/15	Mathlib/Data/Int/ModEq.lean,Mathlib/Data/Nat/ModEq.lean	2	5	['eric-wieser', 'github-actions', 'yury-harmonic']	nobody	35-68462 1 month ago	35-68462 1 month ago	0-55232 15 hours
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	35-63885 1 month ago	97-85101 3 months ago	98-3444 98 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	35-63641 1 month ago	105-14804 3 months ago	105-19407 105 days
26299	adomani author:adomani	perf: the `commandStart` linter only acts on modified files	Introduces an `IO.Ref` to allow the `commandStart` linter to only run on files that git considers modified with respect to `master`. The linter is also active on files that have had some error, as these are likely being modified! The PR should also mitigate the speed-up that the linter introduced: [#mathlib4 > A whitespace linter @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/A.20whitespace.20linter/near/525091877) Assuming that this goes well, a similar mechanism could be applied to several linters that do not need to run on all code, just on the modified code. Implementation detail: the linter is currently either on or off in "whole" files. It may be also a future development to make this more granular and only run the linter on "modifed commands in modified files", but this is not currently the plan for this modification! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter awaiting-author	48/0	Mathlib/Tactic/Linter/CommandStart.lean	1	7	['adomani', 'github-actions', 'grunweg', 'leanprover-bot']	joneugster assignee:joneugster	35-63493 1 month ago	35-63615 1 month ago	66-73556 66 days
28474	astrainfinita author:astrainfinita	feat: add `ContinuousSMul` instances for `ℚ≥0`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	bench-after-CI t-algebra t-topology awaiting-author label:t-algebra$	14/0	Mathlib/Topology/Instances/Rat.lean	1	11	['astrainfinita', 'github-actions', 'ocfnash', 'themathqueen']	ocfnash assignee:ocfnash	35-48446 1 month ago	49-39562 1 month ago	49-46356 49 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	35-40776 1 month ago	40-42495 1 month ago	66-33490 66 days
26913	Paul-Lez author:Paul-Lez	feat(NumberTheory/{*}): add a few lemmas about number field and cyclotomic extensions	The motivation for this PR is that the main statement in [this PR](https://github.com/google-deepmind/formal-conjectures/pull/297) shouldn't need to assume `p` has type `PNat` for the instances to work. This is still WIP as I need to clean up (currently waiting on the build!) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory awaiting-CI WIP label:t-algebra$	52/0	Mathlib/NumberTheory/ClassNumber/Temporary.lean,Mathlib/NumberTheory/Cyclotomic/Basic.lean,Mathlib/NumberTheory/Cyclotomic/Embeddings.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/TotallyRealComplex.lean	4	1	['github-actions']	nobody	35-23905 1 month ago	35-24031 1 month ago	0-28 28 seconds
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	35-5878 1 month ago	47-46008 1 month ago	47-77371 47 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	35-5871 1 month ago	47-34126 1 month ago	47-34168 47 days
28486	euprunin author:euprunin	chore(Order): golf entire `map_covBy`, `covBy_of_apply`, `map_wcovBy`, `wcovBy_of_apply`, `ne_bot_of_ne_top'`, `insert_Icc_left_eq_Icc_pred` and `insert_Icc_right_eq_Icc_succ`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	14/24	Mathlib/Order/Cover.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/Interval/Set/SuccPred.lean	3	6	['YaelDillies', 'bryangingechen', 'github-actions', 'mathlib4-merge-conflict-bot']	bryangingechen assignee:bryangingechen	34-69488 1 month ago	34-69488 1 month ago	14-50468 14 days
26455	ScottCarnahan author:ScottCarnahan	WIP - feat (LinearAlgebra/RootSystem): API for CartanMatrix	Some attempts at working out good ways to eliminate bad Cartan matrices. Very much WIP --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	815/26	Mathlib/Algebra/Group/Action/Faithful.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean,Mathlib/LinearAlgebra/RootSystem/Base.lean,Mathlib/LinearAlgebra/RootSystem/CartanMatrix.lean,Mathlib/LinearAlgebra/RootSystem/Finite/CanonicalBilinear.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Lemmas.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Relations.lean,Mathlib/LinearAlgebra/RootSystem/IsValuedIn.lean,Mathlib/LinearAlgebra/RootSystem/RootPositive.lean	9	7	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	34-68021 1 month ago	34-68039 1 month ago	0-17731 4 hours
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	34-67106 1 month ago	37-62353 1 month ago	37-62393 37 days
29145	JovanGerb author:JovanGerb	chore: use `to_additive` in more places	This PR addresses some comments about `to_additive` not working, by making it work more. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		61/177	Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Order/BigOperators/Group/LocallyFinite.lean,Mathlib/Combinatorics/Additive/DoublingConst.lean,Mathlib/Data/ZMod/Aut.lean,Mathlib/Topology/Algebra/InfiniteSum/Module.lean	5	3	['JovanGerb', 'github-actions']	nobody	34-10596 1 month ago	34-40535 1 month ago	34-40511 34 days
28390	euprunin author:euprunin	chore(Analysis/LocallyConvex): golf entire `polar_weak_closed`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	1/4	Mathlib/Analysis/LocallyConvex/Polar.lean	1	2	['JonBannon', 'github-actions', 'j-loreaux']	j-loreaux assignee:j-loreaux	34-1699 1 month ago	34-1699 1 month ago	16-76176 16 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	33-51864 1 month ago	34-19256 1 month ago	88-36789 88 days
26156	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure) : add a definition of total variation for VectorMeasure	This PR adds variation for any `VectorMeasure` using a supremum definition. Currently mathlib has `TotalVariation` defined for a signed measure using the Hahn-Jordan decomposition, but this doesn't generalise. Motivation: generally this is an important concept but specifically as a step for proving RMK in the complex case which in turn is a step to prove the spectral theorem. Co-authored-by: @yoh-tanimoto This PR was migrated from #25442. PR divided into smaller pieces, this is just the definition without additional lemmas. PRs adding further results related to variation are: * #26160 * #26165 * #26168 (shows that for `SignedMeasures` the two definitions of variation coincide) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	358/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean	2	32	['EtienneC30', 'github-actions', 'yoh-tanimoto']	EtienneC30 assignee:EtienneC30	33-45099 1 month ago	64-38219 2 months ago	42-9361 42 days
29186	winstonyin author:winstonyin	feat: IsIntegralCurve for solutions to ODEs	I define `IsIntegralCurve` etc. for solutions to ODEs on vector spaces. The translation and scaling lemmas are also included. This parallels `IsMIntegralCurve` etc. for manifolds. Moved from #26534. - [x] depends on: #26563 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics t-analysis t-differential-geometry	298/0	Mathlib.lean,Mathlib/Analysis/ODE/Basic.lean,Mathlib/Analysis/ODE/Transform.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	33-25607 1 month ago	33-25697 1 month ago	33-25834 33 days
28279	Equilibris author:Equilibris	feat: univ generic W	A simple change making `W.ind`'s motive universe generic. --- A theorem `w_ind_eq` will now be needed, but this will depend on getting `dcongr_heq` merged, and hence I will do this in a separate PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	16/21	Mathlib/Data/PFunctor/Multivariate/W.lean	1	8	['Equilibris', 'alexkeizer', 'github-actions']	nobody	33-23845 1 month ago	52-71511 1 month ago	0-0 0 seconds
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	33-19996 1 month ago	33-24712 1 month ago	102-51303 102 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	33-5832 1 month ago	43-49086 1 month ago	45-25928 45 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	32-71884 1 month ago	32-76930 1 month ago	97-47410 97 days
22231	pechersky author:pechersky	feat(Algebra/Valued): `AdicExpansion` initial defns	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology awaiting-author label:t-algebra$	299/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	7	['Thmoas-Guan', 'github-actions', 'grunweg', 'jcommelin']	jcommelin assignee:jcommelin	32-51566 1 month ago	32-51566 1 month ago	189-33553 189 days
28234	alreadydone author:alreadydone	chore(AlgebraicTopology): clean up FundamentalGroupoid	+ Extract `FundamentalGroupoid.map (f : C(X, Y)) : FundamentalGroupoid X ⥤ FundamentalGroupoid Y` from `fundamentalGroupoidFunctor : TopCat ⥤ CategoryTheory.Grpd` + Define `FundamentalGroup.map (f : C(X, Y)) (x : X) : FundamentalGroup X x →* FundamentalGroup Y (f x)` and `mapOfEq : FundamentalGroup X x →* FundamentalGroup Y y` that takes an assumption `f x = y`. + Redefine `FundamentalGroup` to be `End` rather than `Aut`: since `FundamentalGroupoid` is a groupoid, `End` already has a group structure. This requires fixing some proofs about `HomotopyGroup`s, so we take this opportunity to golf a few proofs and replace `=>` by `↦`. + Golf within the file FundamentalGroupoid/Basic. + Generalize `toArrow` up to `fromPath` in `FundamentalGroupoid/FundamentalGroup` from `X : TopCat` to `[TopologicalSpace X]`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology awaiting-author	104/141	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Product.lean	8	3	['github-actions', 'jcommelin', 'mathlib4-merge-conflict-bot']	mattrobball assignee:mattrobball	32-44831 1 month ago	32-44831 1 month ago	20-65201 20 days
29147	ocfnash author:ocfnash	feat: miscellaneous root system lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	73/34	Mathlib/LinearAlgebra/RootSystem/Defs.lean,Mathlib/LinearAlgebra/RootSystem/Finite/G2.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Nondegenerate.lean,Mathlib/LinearAlgebra/RootSystem/Reduced.lean	4	1	['github-actions']	nobody	32-36351 1 month ago	34-21011 1 month ago	0-2 2 seconds
26710	metakunt author:metakunt	feat (Data/Nat/Digits/Lemmas): Add digits_getD	Adds digits_getD, an explicit computation of the i-th digits of n in base b representation.	t-data new-contributor awaiting-author	48/0	Mathlib/Data/Nat/Digits/Lemmas.lean	1	8	['github-actions', 'pechersky', 'plp127']	nobody	32-24054 1 month ago	35-23245 1 month ago	56-72456 56 days
28070	grunweg author:grunweg	style: improve indentation of multi-linear enumerations in doc-strings	Per zulip discussion: [#mathlib4 > Style :bicycle: : indenting second lines in doc-strings @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Style.20.3Abicycle.3A.20.3A.20indenting.20second.20lines.20in.20doc-strings/near/533105734). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		111/108	Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Module/LinearMap/Polynomial.lean,Mathlib/CategoryTheory/Abelian/NonPreadditive.lean,Mathlib/CategoryTheory/EqToHom.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/Pi.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/Condensed/Discrete/Characterization.lean,Mathlib/FieldTheory/ChevalleyWarning.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,docs/Conv/Guide.lean	16	6	['github-actions', 'grunweg', 'kbuzzard']	kbuzzard assignee:kbuzzard	32-21994 1 month ago	57-68530 1 month ago	57-68505 57 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	32-5857 1 month ago	46-41333 1 month ago	46-41369 46 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	31-34587 1 month ago	102-79429 3 months ago	103-6936 103 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	31-34508 1 month ago	113-44444 3 months ago	113-44419 113 days
23940	YaelDillies author:YaelDillies	feat: polytopes	From Toric Co-authored-by: Matthew Johnson --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-analysis awaiting-author	65/0	Mathlib.lean,Mathlib/Geometry/Convex/Polytope.lean,Mathlib/Geometry/Convex/README.md	3	11	['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'j-loreaux', 'jsm28', 'leanprover-community-bot-assistant', 'ooovi']	j-loreaux assignee:j-loreaux	31-33656 1 month ago	31-33672 1 month ago	143-64212 143 days
25780	emilyriehl author:emilyriehl	feat: the homotopy category functor preserves products	This proves that the homotopy category construction defines a lax monoidal functor from simplicial sets to categories. In particular, simplicially enriched categories have quotient categorically enriched categories, which might be thought of as "homotopy bicategories." Co-authored-by: Dominic Verity , Bhavik Mehta , Thomas Murrills , and Andrew Yang . --- - [x] depends on: #27576 This PR continues the work from #25010. Original PR: https://github.com/leanprover-community/mathlib4/pull/25010	t-algebraic-topology infinity-cosmos large-import t-category-theory	253/11	Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialSet/Nerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/CategoryTheory/Category/ULift.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/Limits/Preserves/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/Order/Hom/Basic.lean	10	6	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	31-16914 1 month ago	46-46227 1 month ago	46-47266 46 days
28429	euprunin author:euprunin	chore(GroupTheory/Perm/Cycle): deprecate `Disjoint.cycleType_mul`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory awaiting-author	2/8	Mathlib/GroupTheory/Perm/Cycle/Type.lean	1	4	['euprunin', 'github-actions', 'tb65536']	tb65536 assignee:tb65536	31-16083 1 month ago	36-30917 1 month ago	12-12845 12 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	31-5860 1 month ago	39-10138 1 month ago	39-15450 39 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	30-66366 1 month ago	75-43190 2 months ago	75-43234 75 days
25927	jjdishere author:jjdishere	feat(RingTheory/AdicCompletion): more APIs for IsAdicComplete	This PR continues the work from #21582. Original PR: https://github.com/leanprover-community/mathlib4/pull/21582	t-ring-theory awaiting-author	452/11	Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/PowTransition.lean	3	5	['github-actions', 'jjdishere']	nobody	30-65534 1 month ago	59-61158 1 month ago	9-35950 9 days
29232	vihdzp author:vihdzp	feat: more theorems on `SuccAddOrder`	We make use of the (relatively) new `CanonicallyOrderedAdd` typeclass in order to generalize various theorems on `Ordinal` to `SuccAddOrder`. Later on we'll deprecate the `Ordinal` versions in favor of these. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra label:t-algebra$	54/1	Mathlib/Algebra/Order/SuccPred.lean	1	2	['github-actions', 'plp127']	nobody	30-38244 1 month ago	31-82114 1 month ago	31-82147 31 days
26935	Paul-Lez author:Paul-Lez	feat(Analysis/SpecialFunction/NthRoot): definition and basic API of Real.nthRoot	This PR continues the work from #25364. Original PR: https://github.com/leanprover-community/mathlib4/pull/25364 Co-authored-by: Eric Wieser	t-analysis	311/0	Mathlib/Analysis/SpecialFunctions/NthRoot.lean	1	10	['Paul-Lez', 'eric-wieser', 'github-actions', 'mo271', 'smmercuri', 'yury-harmonic']	nobody	30-11920 1 month ago	86-46994 2 months ago	86-47040 86 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	30-5864 1 month ago	40-86308 1 month ago	40-86342 40 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	30-5863 1 month ago	39-32430 1 month ago	39-32463 39 days
29120	eric-wieser author:eric-wieser	feat: add a typeclass for the indiscrete topology	Notably, this changes the assumptions of `theorem ContinuousLinearMap.norm_id : ‖id 𝕜 E‖ = 1` from `[NormedAddCommGroup E] [Nontrivial E]` to the more general `[SeminormedAddCommGroup E] [NontrivialTopology E]`. I've skipped the deprecations since #28102 hasn't made it to any release yet. As discussed in [#Is there code for X? > Typeclass for nontrivial topology @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Typeclass.20for.20nontrivial.20topology/near/533192558) and [#Is there code for X? > Typeclass for indiscrete topology @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Typeclass.20for.20indiscrete.20topology/near/512174181) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	250/76	Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Hom.lean,Mathlib/Analysis/Normed/Group/SeparationQuotient.lean,Mathlib/Analysis/Normed/Module/RCLike/Real.lean,Mathlib/Analysis/Normed/Operator/Basic.lean,Mathlib/Analysis/Normed/Operator/NormedSpace.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/Maps/Basic.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Sets/Opens.lean,Mathlib/Topology/Sheaves/PUnit.lean	14	4	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	30-3451 1 month ago	30-12750 1 month ago	34-83584 34 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	29-74533 29 days ago	90-37659 2 months ago	90-37697 90 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	29-71067 29 days ago	84-62219 2 months ago	84-62255 84 days
29339	kim-em author:kim-em	feat: add linter for deprecations on different dates not separated by a blank line	Written by claude. Seems to behave correctly, but I have no opinion on the implementation. I can't work out how to test the behaviour using `#guard_msgs`, however.	t-linter	198/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/DeprecatedDates.lean,MathlibTest/Linter/DeprecatedDates.lean	4	8	['adomani', 'github-actions']	nobody	29-69630 29 days ago	29-79691 29 days ago	29-79729 29 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	29-68734 29 days ago	unknown	unknown
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	29-58682 29 days ago	31-7948 1 month ago	64-69211 64 days
26310	kckennylau author:kckennylau	Binary form	This PR provides the basic definition of binary forms, which are homogeneous polynomials in two variables. --- - [ ] depends on: #26312 - [ ] depends on: #26313 - [ ] depends on: #26314 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	73/0	Mathlib.lean,Mathlib/RingTheory/MvPolynomial/BinaryForm.lean	2	13	['MichaelStollBayreuth', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'ocfnash']	ocfnash assignee:ocfnash	29-47063 29 days ago	45-36734 1 month ago	57-1104 57 days
27321	kckennylau author:kckennylau	feat(CategoryTheory): Colimit can be computed fiberwise	We consider category `J` equipped with a functor `F : J ⥤ D` to a discrete category `D`. Then the colimit of any diagram `diagram : J ⥤ C` can be computed using the following algorithm: 1. For each `d : D`, compute the colimit of the restricted diagram `F.fiberIncl d ⋙ diagram`. 2. Take the coproduct of these colimits over all `d : D`. We call this "computing the colimit fiberwise". --- Zulip: [#Is there code for X? > over category via a functor](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/over.20category.20via.20a.20functor/with/529574191) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-CI	136/0	Mathlib.lean,Mathlib/CategoryTheory/FiberedCategory/Fiber.lean,Mathlib/CategoryTheory/Limits/Shapes/Fiberwise.lean	3	24	['github-actions', 'kckennylau', 'robin-carlier']	nobody	29-44946 29 days ago	29-44946 29 days ago	19-15685 19 days
29108	JonBannon author:JonBannon	feat(MeasureTheory): add `LInfty.lean` with `Mul` and `const` related results.	Continuing to develop pieces needed for a `CStarAlgebra` instance for `Lp R ∞ μ`, we introduce a file `MeasureTheory.Function.LInfty.lean` that takes `MeasureTheory.Function.LpSpace.Basic` and `MeasureTheory.Function.Holder` as imports, and introduces the `Mul` instance on Linfty, and const-related results. In a future PR we will handle `One`, as this will require dealing with `AEEqFun` as well as `Lp` level objects and it's probably best to handle these together in a single PR. We opted to add this file to keep imports light, since adding the `Mul` results to `Basic` would require importing `Holder`, and including these results in `Holder` seemed too specific and would make `Holder` heavier. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	91/0	Mathlib.lean,Mathlib/MeasureTheory/Function/LInfty.lean	2	5	['JonBannon', 'github-actions', 'j-loreaux']	nobody	29-39947 29 days ago	31-32611 1 month ago	4-12126 4 days
29321	FormulaRabbit81 author:FormulaRabbit81	feat(Topology): obtain new distance structures on pseudo(e)metricspaces	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-CI WIP	130/65	Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Topology/MetricSpace/Basic.lean,Mathlib/Topology/MetricSpace/PiNat.lean,Mathlib/Topology/MetricSpace/Pseudo/Constructions.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean,Mathlib/Topology/MetricSpace/Pseudo/Pi.lean,Mathlib/Topology/MetricSpace/UniformConvergence.lean	8	7	['FormulaRabbit81', 'YaelDillies', 'github-actions']	nobody	29-12882 29 days ago	29-12882 29 days ago	0-76797 21 hours
22954	eric-wieser author:eric-wieser	feat(RingTheory/Congruence/Hom): copy from GroupTheory	This was motivated in review of #22355, but I no longer recall why. It also helps with #29357. Either way, this captures a definition that was inlined in a later file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	214/16	Mathlib/Algebra/RingQuot.lean,Mathlib/GroupTheory/Congruence/Hom.lean,Mathlib/RingTheory/Congruence/Defs.lean,Mathlib/RingTheory/Congruence/Hom.lean,Mathlib/RingTheory/TwoSidedIdeal/Kernel.lean	5	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	29-7787 29 days ago	29-7809 29 days ago	140-63070 140 days
27995	kckennylau author:kckennylau	feat(RingTheory/Valuation): alternate constructors for Valuation	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-CI	82/0	Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/FieldTheory/RatFunc/Degree.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/RingTheory/Valuation/Basic.lean	4	22	['YaelDillies', 'github-actions', 'grunweg', 'kckennylau', 'pechersky']	nobody	28-70195 28 days ago	28-70195 28 days ago	18-47707 18 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	28-68914 28 days ago	59-61300 1 month ago	103-17514 103 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	28-58310 28 days ago	28-58310 28 days ago	34-44492 34 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	28-36906 28 days ago	35-60795 1 month ago	37-31400 37 days
28836	yury-harmonic author:yury-harmonic	feat: add `norm_num` extensions	Add `norm_num` extensions for - `Int.negOfNat`; - `Nat.floor`, `Nat.ceil`, `Int.fract`, and `Int.round`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	319/7	Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Data/NNRat/Floor.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Tactic/NormNum/Basic.lean,MathlibTest/norm_num_ext.lean	5	8	['Ruben-VandeVelde', 'digama0', 'eric-wieser', 'github-actions']	j-loreaux assignee:j-loreaux	28-35754 28 days ago	28-35754 28 days ago	12-38307 12 days
26339	mans0954 author:mans0954	feat(Analysis/Normed/Module/WeakDual): Banach Dieudonné Lemma	This PR continues the work from #16316. Original PR: https://github.com/leanprover-community/mathlib4/pull/16316	large-import t-analysis WIP	377/3	Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Topology/UniformSpace/Cauchy.lean	4	n/a	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	28-31791 28 days ago	unknown	unknown
29355	girving author:girving	feat(Trigonometric): Taylor series bounds for sin and cos	Zulip discussion here: https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Better.20.60Real.2Esin.60.20bounds/near/535035576 We also include the full set of intervals on which sin and cos are monotone/antitone. --- Questions to resolve as part of review: 1. I've left the `Finset.sum_range_even` in the new `SeriesBounds` file, but presumably it should go somewhere else (unless you want me to inline it, but that seems worse). 2. Is putting the new Taylor series bounds in a new `SeriesBounds` file right, or should it go in the current `Bounds.lean` file? When I started writing the PR I thought the new bounds would need more imports via more analysis, but it turns out the only new import needed would be `Mathlib.Algebra.BigOperators.Field` which seems lightweight. I am happy with whatever the preference is in terms of file structure. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	158/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/SeriesBounds.lean	4	24	['Parcly-Taxel', 'Ruben-VandeVelde', 'girving', 'github-actions', 'llllvvuu']	nobody	28-26607 28 days ago	29-14832 29 days ago	29-20709 29 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	28-5866 28 days ago	36-22096 1 month ago	42-49380 42 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	28-5864 28 days ago	37-12520 1 month ago	44-65734 44 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	28-5860 28 days ago	37-12753 1 month ago	37-13190 37 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	28-5859 28 days ago	37-2501 1 month ago	37-2485 37 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	28-5857 28 days ago	36-24509 1 month ago	36-24540 36 days
26159	upobir author:upobir	feat(Algebra/QuadraticDiscriminant): Adding inequalities on quadratic from inequalities on discriminant	This PR continues the work from #24517. Original PR: https://github.com/leanprover-community/mathlib4/pull/24517 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	34/0	Mathlib/Algebra/QuadraticDiscriminant.lean	1	8	['chrisflav', 'github-actions', 'tb65536', 'upobir']	chrisflav assignee:chrisflav	27-43099 27 days ago	51-34627 1 month ago	55-10605 55 days
28389	euprunin author:euprunin	chore(Algebra/Group/Subgroup): golf entire `subgroupOf_sup`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	2/6	Mathlib/Algebra/Group/Subgroup/Ker.lean	1	3	['Ruben-VandeVelde', 'chrisflav', 'euprunin', 'github-actions']	chrisflav assignee:chrisflav	27-40683 27 days ago	27-40683 27 days ago	23-37322 23 days
28305	euprunin author:euprunin	chore(RingTheory/MvPolynomial): deprecate `weightedHomogeneousComponent_of_isWeightedHomogeneous_same` and golf entire `weightedHomogeneousComponent_of_isWeightedHomogeneous_ne`	--- Show trace profiling of `weightedHomogeneousComponent_of_isWeightedHomogeneous_same`: 12 ms before, <10 ms after 🎉 ### Trace profiling of `weightedHomogeneousComponent_of_isWeightedHomogeneous_same` before PR 28305 ```diff diff --git a/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean b/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean index 6490df8bf8..1bdb4d75ae 100644 --- a/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean +++ b/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean @@ -434,2 +434,3 @@ theorem weightedHomogeneousComponent_of_mem [DecidableEq M] {m n : M} +set_option trace.profiler true in theorem weightedHomogeneousComponent_of_isWeightedHomogeneous_same ``` ``` ℹ [1208/1208] Built Mathlib.RingTheory.MvPolynomial.WeightedHomogeneous info: Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean:436:0: [Elab.async] [0.012999] elaborating proof of MvPolynomial.weightedHomogeneousComponent_of_isWeightedHomogeneous_same [Elab.definition.value] [0.012383] MvPolynomial.weightedHomogeneousComponent_of_isWeightedHomogeneous_same [Elab.step] [0.012139] classical ext x rw [coeff_weightedHomogeneousComponent] by_cases zero_coeff : coeff x p = 0 · simp [zero_coeff] · rw [hp zero_coeff, if_pos rfl] [Elab.step] [0.012134] classical ext x rw [coeff_weightedHomogeneousComponent] by_cases zero_coeff : coeff x p = 0 · simp [zero_coeff] · rw [hp zero_coeff, if_pos rfl] [Elab.step] [0.012128] classical ext x rw [coeff_weightedHomogeneousComponent] by_cases zero_coeff : coeff x p = 0 · simp [zero_coeff] · rw [hp zero_coeff, if_pos rfl] [Elab.step] [0.012045] ext x rw [coeff_weightedHomogeneousComponent] by_cases zero_coeff : coeff x p = 0 · simp [zero_coeff] · rw [hp zero_coeff, if_pos rfl] [Elab.step] [0.012034] ext x rw [coeff_weightedHomogeneousComponent] by_cases zero_coeff : coeff x p = 0 · simp [zero_coeff] · rw [hp zero_coeff, if_pos rfl] Build completed successfully. ``` ### Trace profiling of `weightedHomogeneousComponent_of_isWeightedHomogeneous_same` after PR 28305 ```diff diff --git a/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean b/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean index 6490df8bf8..df101a703d 100644 --- a/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean +++ b/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean @@ -434,11 +434,7 @@ theorem weightedHomogeneousComponent_of_mem [DecidableEq M] {m n : M} +set_option trace.profiler true in theorem weightedHomogeneousComponent_of_isWeightedHomogeneous_same {m : M} {p : MvPolynomial σ R} (hp : IsWeightedHomogeneous w p m) : - weightedHomogeneousComponent w m p = p := by - classical - ext x - rw [coeff_weightedHomogeneousComponent] - by_cases zero_coeff : coeff x p = 0 - · simp [zero_coeff] - · rw [hp zero_coeff, if_pos rfl] + weightedHomogeneousComponent w m p = p := + IsWeightedHomogeneous.weightedHomogeneousComponent_same hp @@ -446,9 +442,4 @@ theorem weightedHomogeneousComponent_of_isWeightedHomogeneous_ne {m n : M} {p : MvPolynomial σ R} (hp : IsWeightedHomogeneous w p m) (hn : n ≠ m) : - weightedHomogeneousComponent w n p = 0 := by - classical - ext x - rw [coeff_weightedHomogeneousComponent] - by_cases zero_coeff : coeff x p = 0 - · simp [zero_coeff] - · rw [if_neg (by simp only [hp zero_coeff, hn.symm, not_false_eq_true]), coeff_zero] + weightedHomogeneousComponent w n p = 0 := + IsWeightedHomogeneous.weightedHomogeneousComponent_ne n hp hn ``` ``` ✔ [1208/1208] Built Mathlib.RingTheory.MvPolynomial.WeightedHomogeneous Build completed successfully. ``` --- Show trace profiling of `weightedHomogeneousComponent_of_isWeightedHomogeneous_ne`: 13 ms before, <10 ms after 🎉 ### Trace profiling of `weightedHomogeneousComponent_of_isWeightedHomogeneous_ne` before PR 28305 ```diff diff --git a/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean b/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean index 6490df8bf8..b83c5c6269 100644 --- a/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean +++ b/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean @@ -444,2 +444,3 @@ theorem weightedHomogeneousComponent_of_isWeightedHomogeneous_same +set_option trace.profiler true in theorem weightedHomogeneousComponent_of_isWeightedHomogeneous_ne ``` ``` ℹ [1208/1208] Built Mathlib.RingTheory.MvPolynomial.WeightedHomogeneous info: Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean:446:0: [Elab.async] [0.013611] elaborating proof of MvPolynomial.weightedHomogeneousComponent_of_isWeightedHomogeneous_ne [Elab.definition.value] [0.012857] MvPolynomial.weightedHomogeneousComponent_of_isWeightedHomogeneous_ne [Elab.step] [0.012517] classical ext x rw [coeff_weightedHomogeneousComponent] by_cases zero_coeff : coeff x p = 0 · simp [zero_coeff] · rw [if_neg (by simp only [hp zero_coeff, hn.symm, not_false_eq_true]), coeff_zero] [Elab.step] [0.012512] classical ext x rw [coeff_weightedHomogeneousComponent] by_cases zero_coeff : coeff x p = 0 · simp [zero_coeff] · rw [if_neg (by simp only [hp zero_coeff, hn.symm, not_false_eq_true]), coeff_zero] [Elab.step] [0.012508] classical ext x rw [coeff_weightedHomogeneousComponent] by_cases zero_coeff : coeff x p = 0 · simp [zero_coeff] · rw [if_neg (by simp only [hp zero_coeff, hn.symm, not_false_eq_true]), coeff_zero] [Elab.step] [0.012450] ext x rw [coeff_weightedHomogeneousComponent] by_cases zero_coeff : coeff x p = 0 · simp [zero_coeff] · rw [if_neg (by simp only [hp zero_coeff, hn.symm, not_false_eq_true]), coeff_zero] [Elab.step] [0.012443] ext x rw [coeff_weightedHomogeneousComponent] by_cases zero_coeff : coeff x p = 0 · simp [zero_coeff] · rw [if_neg (by simp only [hp zero_coeff, hn.symm, not_false_eq_true]), coeff_zero] Build completed successfully. ``` ### Trace profiling of `weightedHomogeneousComponent_of_isWeightedHomogeneous_ne` after PR 28305 ```diff diff --git a/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean b/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean index 6490df8bf8..066f4824e9 100644 --- a/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean +++ b/Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean @@ -436,19 +436,10 @@ theorem weightedHomogeneousComponent_of_isWeightedHomogeneous_same {m : M} {p : MvPolynomial σ R} (hp : IsWeightedHomogeneous w p m) : - weightedHomogeneousComponent w m p = p := by - classical - ext x - rw [coeff_weightedHomogeneousComponent] - by_cases zero_coeff : coeff x p = 0 - · simp [zero_coeff] - · rw [hp zero_coeff, if_pos rfl] + weightedHomogeneousComponent w m p = p := + IsWeightedHomogeneous.weightedHomogeneousComponent_same hp +set_option trace.profiler true in theorem weightedHomogeneousComponent_of_isWeightedHomogeneous_ne {m n : M} {p : MvPolynomial σ R} (hp : IsWeightedHomogeneous w p m) (hn : n ≠ m) : - weightedHomogeneousComponent w n p = 0 := by - classical - ext x - rw [coeff_weightedHomogeneousComponent] - by_cases zero_coeff : coeff x p = 0 - · simp [zero_coeff] - · rw [if_neg (by simp only [hp zero_coeff, hn.symm, not_false_eq_true]), coeff_zero] + weightedHomogeneousComponent w n p = 0 := + IsWeightedHomogeneous.weightedHomogeneousComponent_ne n hp hn ``` ``` ✔ [1208/1208] Built Mathlib.RingTheory.MvPolynomial.WeightedHomogeneous Build completed successfully. ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	6/17	Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean	1	4	['chrisflav', 'github-actions', 'mattrobball']	chrisflav assignee:chrisflav	27-40483 27 days ago	27-40483 27 days ago	24-72362 24 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	27-38391 27 days ago	27-38422 27 days ago	55-33309 55 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	27-37207 27 days ago	27-38555 27 days ago	38-39930 38 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	27-5851 27 days ago	38-40481 1 month ago	51-10696 51 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	27-5849 27 days ago	40-22590 1 month ago	40-24338 40 days
29212	Whysoserioushah author:Whysoserioushah	feat(Algebra/CrossProductAlgebra/Defs) : Define Cross Product Algebra	PS: All to-dos listed in the file has been fully sorry-freed and will be (slowly) upstreamed by either me or Yaël Co-authored-by: Yaël Dillies Co-authored-by: Jujian Zhang --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	270/0	Mathlib.lean,Mathlib/RepresentationTheory/CrossProductAlgebra/Defs.lean,docs/references.bib	3	8	['Whysoserioushah', 'YaelDillies', 'eric-wieser', 'github-actions']	nobody	26-66759 26 days ago	26-66759 26 days ago	5-63264 5 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	26-56944 26 days ago	48-63399 1 month ago	48-63432 48 days
24669	qawbecrdtey author:qawbecrdtey	feat(Analysis/Normed/Operator/LinearIsometry): added definition `LinearIsometryEquiv.prodComm`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This commit defines a `LinearIsometryEquiv`, and states some trivial theorems about it. ```lean def prodComm [Module R E₂] : E × E₂ ≃ₗᵢ[R] E₂ × E ```	maintainer-merge t-analysis awaiting-author	8/1	Mathlib/Analysis/Normed/Operator/LinearIsometry.lean	1	12	['Ruben-VandeVelde', 'eric-wieser', 'faenuccio', 'github-actions', 'j-loreaux', 'jcommelin', 'qawbecrdtey']	faenuccio assignee:faenuccio	26-3894 26 days ago	115-78126 3 months ago	32-83569 32 days
28384	euprunin author:euprunin	chore(Algebra/Order/Ring): golf entire `cast_natAbs`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	1/4	Mathlib/Algebra/Order/Ring/Cast.lean	1	2	['github-actions', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	25-46763 25 days ago	25-46763 25 days ago	25-31928 25 days
28385	euprunin author:euprunin	chore(Algebra/BigOperators/Finsupp): deprecate `Finsupp.sum_sum_index'`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	1/4	Mathlib/Algebra/BigOperators/Finsupp/Basic.lean	1	7	['euprunin', 'github-actions', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	25-46740 25 days ago	25-46740 25 days ago	25-31871 25 days
27701	vihdzp author:vihdzp	feat: `a < b + c ↔ a < b ∨ ∃ d < c, a = b + d`	...and analogous results on `CanonicallyOrderedAdd`. --- - [x] depends on: #29084 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	41/0	Mathlib/Algebra/Order/Monoid/Canonical/Basic.lean	1	5	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	25-45986 25 days ago	25-46026 25 days ago	0-42619 11 hours
26881	emo916math author:emo916math	feat(Analysis/Calculus/Deriv/Star) A formula for `deriv (conj ∘ f ∘ conj)`	Added a lemma that `deriv (conj ∘ f ∘ conj) = conj ∘ deriv f ∘ conj`, proved by cases on whether the derivative mathematically exists or not. This PR replaces [#26805](https://github.com/leanprover-community/mathlib4/pull/26805); see discussion there. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author	50/2	Mathlib/Analysis/Calculus/Deriv/Star.lean	1	15	['emo916math', 'github-actions', 'j-loreaux', 'kckennylau']	j-loreaux assignee:j-loreaux	25-39935 25 days ago	56-39489 1 month ago	31-70593 31 days
24533	robertmaxton42 author:robertmaxton42	feat (ULift): conjugation by ULift.up/down, misc cast/heq lemmas	* Adds the convenience def `ULift.conj x := `down (f (up x))`, and corresponding basic lemmas * Adds lemmas showing that `ULift.up` and `.down` commute with casts and preserve `HEq`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	31/0	Mathlib/Data/ULift.lean	1	23	['eric-wieser', 'github-actions', 'grunweg', 'robertmaxton42']	nobody	25-37744 25 days ago	36-67759 1 month ago	118-2181 118 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	25-31726 25 days ago	25-36730 25 days ago	95-39039 95 days
29435	sgouezel author:sgouezel	WIP: typeclass experiment	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	33/7	Mathlib/Algebra/QuadraticAlgebra.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/GroupTheory/GroupAction/Hom.lean	3	5	['eric-wieser', 'github-actions', 'leanprover-bot', 'sgouezel']	nobody	25-28167 25 days ago	25-59205 25 days ago	0-1 1 second
26462	PSchwahn author:PSchwahn	feat(LinearAlgebra/Projection): add results about inverse of `Submodule.prodEquivOfIsCompl`	Add two theorems `Submodule.prodEquivOfIsCompl_symm_apply` and `Submodule.prodEquivOfIsCompl_symm_add`, which are API for `Submodule.prodEquivOfIsCompl`. We believe these theorems are useful; for example, we have used their statements in a [classification formalization project](https://github.com/LieLean/LowDimSolvClassification). Co-authored by: - [Viviana del Barco](https://github.com/vdelbarc) - [Gustavo Infanti](https://github.com/GuQOliveira) - [Exequiel Rivas](https://github.com/erivas) --- I am not sure whether the `prodEquivOfIsCompl_symm_apply` theorem should be tagged with `@[simp]`; this might lead to confluence issues. Opinions are welcome! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	10/0	Mathlib/LinearAlgebra/Projection.lean	1	7	['PSchwahn', 'github-actions', 'joelriou', 'kckennylau']	joelriou assignee:joelriou	25-10004 25 days ago	25-41107 25 days ago	73-43225 73 days
28248	YaelDillies author:YaelDillies	feat: expectation and (conditional) variance of a Bernoulli random variable	Compute the expectation, variance, conditional variance of a Bernoulli random variable. From MiscYD --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	240/0	Mathlib.lean,Mathlib/MeasureTheory/Integral/Bochner/Set.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/Probability/Bernoulli.lean,Mathlib/Probability/HasLaw.lean,Mathlib/Probability/Moments/Variance.lean	6	34	['DavidLedvinka', 'RemyDegenne', 'YaelDillies', 'github-actions', 'kex-y', 'pfaffelh', 'themathqueen']	kex-y assignee:kex-y	24-69956 24 days ago	24-69956 24 days ago	28-39091 28 days
29434	ntapiam author:ntapiam	feat(NonAssoc/LieAdmissible): prove every ring/algebra is LieAdmissible	-awaiting-author	new-contributor t-algebra label:t-algebra$	27/6	Mathlib/Algebra/NonAssoc/LieAdmissible/Defs.lean	1	1	['github-actions']	nobody	24-67783 24 days ago	25-60559 25 days ago	25-60597 25 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	24-41574 24 days ago	38-60310 1 month ago	38-60287 38 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	24-37910 24 days ago	54-27433 1 month ago	68-20261 68 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	24-30828 24 days ago	87-23458 2 months ago	87-23498 87 days
28286	bwangpj author:bwangpj	feat(Geometry/Manifold/ContMDiff): basic lemmas for analytic (`C^ω`) functions	Add basic lemmas relating `ContMDiff` in the `C^ω` case to being `Analytic` on charts. This is upstreamed from [https://github.com/girving/ray](https://github.com/girving/ray). Co-authored-by: Geoffrey Irving --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-differential-geometry awaiting-author	36/0	Mathlib/Geometry/Manifold/ContMDiff/Defs.lean	1	13	['bwangpj', 'girving', 'github-actions', 'grunweg', 'kbuzzard', 'sgouezel']	sgouezel assignee:sgouezel	24-24759 24 days ago	24-65194 24 days ago	27-76128 27 days
26614	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): add more API for `take`/`drop`	These came up while proving the Girth-Diameter inequality. The main lemma proves that taking `n` vertices of a walk results in a sub-walk of taking `k` vertices when `n` is less than or equal to `k`. The sub-walk relation is represented as `p.support.Sublist q.support` where `p` and `q` are walks. - [ ] depends on: #26655 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics awaiting-author	74/0	Mathlib/Combinatorics/SimpleGraph/Walk.lean	1	18	['Rida-Hamadani', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	24-13637 24 days ago	24-13669 24 days ago	4-83551 4 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	23-82986 23 days ago	101-84969 3 months ago	101-85005 101 days
28124	kckennylau author:kckennylau	feat(Tactic): Call an arbitrary Simproc	In the current framework, `Simproc`s are declared by name, and can only be referred to by name. For example, [Nat.divisors_ofNat](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Tactic/Simproc/Divisors.html#Nat.divisors_ofNat) is declared as: ```lean dsimproc_decl Nat.divisors_ofNat (Nat.divisors _) := fun e => do ``` This declaration syntax does not allow for a `Simproc` to depend on any arguments, and even if one constructed a `Simproc` that depends on e.g. a natural number, such as `foo : ℕ → Simproc`, one still cannot call it using the syntax `by simp [foo 37]`. Therefore, this new function aims to solve this problem, by allowing an arbitrary `Simproc` to be executed, using the newly defined function `Lean.Meta.Simp.Simproc.apply (s : Simproc) : TacticM Unit`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	79/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/Apply.lean,MathlibTest/Simproc/Apply.lean	4	27	['JovanGerb', 'b-mehta', 'eric-wieser', 'github-actions', 'hrmacbeth', 'kckennylau']	JovanGerb assignee:JovanGerb	23-58679 23 days ago	29-30240 29 days ago	46-86299 46 days
29514	grunweg author:grunweg	More strict mode	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI WIP	192/33	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ValidatePRTitle.lean,lakefile.lean,scripts/README.md,scripts/check_title_labels.lean	10	1	['github-actions']	nobody	23-29041 23 days ago	23-29108 23 days ago	0-1 1 second
29527	kim-em author:kim-em	feat: script for checking Github URLs	This adds scripts/check_github_urls.py, which checks for links for closed github issues/prs, and shows the context at the link. Of course, many links are to closed pull requests because the discussion there provides useful context. Not sure how to best filter results.	CI WIP	475/0	scripts/README.md,scripts/check_github_urls.py	2	2	['github-actions', 'kim-em']	nobody	23-3383 23 days ago	23-4063 23 days ago	0-1 1 second
27098	Paul-Lez author:Paul-Lez	feat(Algebra/Category/ModuleCat/Sheaf/VectorBundle): define vector bundles	This PR defines vector bundles (upstreamed from [formal-conjectures](https://github.com/google-deepmind/formal-conjectures/pull/28/files)). I plan on adding some more API about the definition in this PR, but figured it would be nice to get some initial feedback about the definition before doing so! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	53/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/VectorBundle.lean	2	4	['Kiolt', 'Raph-DG', 'chrisflav', 'github-actions']	chrisflav assignee:chrisflav	22-56154 22 days ago	65-23835 2 months ago	16-82639 16 days
28266	euprunin author:euprunin	chore(RingTheory): golf entire `single_one_eq_pow` using `simp`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	1/5	Mathlib/RingTheory/LaurentSeries.lean	1	6	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	22-41090 22 days ago	22-41108 22 days ago	0-11379 3 hours
25778	thefundamentaltheor3m author:thefundamentaltheor3m	feat: Monotonicity of `setIntegral` for nonnegative functions	This PR makes it easier to prove monotonicity of the Bochner integral on sets for nonnegative functions by removing the stronger assumption required by the general monotonicity lemma that both of the functions being compared must be integrable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	8/0	Mathlib/MeasureTheory/Integral/Bochner/Set.lean	1	6	['RemyDegenne', 'github-actions', 'sgouezel', 'thefundamentaltheor3m']	nobody	22-40628 22 days ago	113-48461 3 months ago	0-11893 3 hours
26370	b-mehta author:b-mehta	chore(Archive): golf and generalise ascending-descending sequences	This proof was 5 years old, not in a good generality, and overly long. We fix the latter two points. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data delegated	96/120	Archive/Wiedijk100Theorems/AscendingDescendingSequences.lean	1	13	['b-mehta', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-bors']	ericrbg assignee:ericrbg	22-32461 22 days ago	22-32461 22 days ago	78-81111 78 days
26955	mariainesdff author:mariainesdff	feat(LinearAlgebra/OnSup): extend linear maps to sums of modules	Let `A` be a ring, `X, Y` be `A`-modules, and `M, N` be `A`-submodules of `X`. Given two linear maps `f : M →ₗ[A] Y` and `g : N →ₗ[A] Y` that agree on `M ∩ N`, there is a unique linear map `M + N →ₗ[A] Y` that simultaneously extends `f` and `g`. Co-authored-by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	153/0	Mathlib.lean,Mathlib/LinearAlgebra/OnSup.lean	2	16	['AntoineChambert-Loir', 'eric-wieser', 'github-actions', 'j-loreaux', 'wwylele']	alreadydone assignee:alreadydone	22-31923 22 days ago	22-31923 22 days ago	59-73968 59 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	22-28935 22 days ago	100-63123 3 months ago	100-63373 100 days
26039	tsuki8 author:tsuki8	feat(RingTheory/MvPolynomial/MonomialOrder): leadingTerm	define the leadingTerm and prove some lemmas related to the def `leadingTerm`: the leading term of `f` for the monomial ordering `m` some basic lemmas about leadingTerm including: 1. `leadingTerm_eq_zero_iff` 2. `leadingTerm_image_sdiff_singleton_zero` 3. `leadingTerm_image_insert_zero` 4. `leadingTerm_zero` 5. `leadingTerm_degree_eq` 6. `leadingTerm_degree_eq'` some lemmas about the degree of `f - m.leadingTerm f`: 1. `degree_sub_leadingTerm` 2. `degree_sub_leadingTerm_lt_degree` 3. `degree_sub_leadingTerm_lt_iff` Co-authored-by: Junyu Guo @Hagb --- - [ ] depends on: #24361 - [ ] depends on: #26148 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor awaiting-author	99/1	Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean	1	20	['Hagb', 'chrisflav', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	22-21851 22 days ago	22-21851 22 days ago	12-45707 12 days
29570	eric-wieser author:eric-wieser	fix: substitute infotrees in linters	I don't know whether this is necessary in these particular cases, but I've seen places where it is. There are a handful more of these cases in Batteries. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		2/2	Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/TacticAnalysis.lean	2	1	['github-actions']	nobody	22-11262 22 days ago	22-11328 22 days ago	0-0 0 seconds
29576	kim-em author:kim-em	chore: add grind annotations for homomorphisms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	7/7	Mathlib/Algebra/Group/Hom/Defs.lean	1	1	['github-actions']	nobody	21-77804 21 days ago	21-77818 21 days ago	0-0 0 seconds
28693	faenuccio author:faenuccio	feat(Analysis.Normed.Module.Milman-Pettis): add Milman-Pettis theorem	We add the Milman-Pettis theorem stating that an uniformly convex Banach space is reflexive. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP	279/0	Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/Normed/Module/Milman-Pettis.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean	4	3	['faenuccio', 'github-actions', 'grunweg']	nobody	21-42950 21 days ago	44-47574 1 month ago	0-1 1 second
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	21-5870 21 days ago	31-25529 1 month ago	31-28571 31 days
26920	yuma-mizuno author:yuma-mizuno	feat(Tactic.CategoryTheory): add associator inserting tactic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory t-meta WIP	714/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Associators.lean,MathlibTest/CategoryTheory/Associators.lean	4	1	['github-actions']	nobody	20-76166 20 days ago	86-69941 2 months ago	0-16 16 seconds
29615	eric-wieser author:eric-wieser	chore: add a computable shortcut for `AddCommMonoid ℂ`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	bench-after-CI t-analysis easy	9/1	Mathlib/Analysis/Complex/Basic.lean	1	1	['github-actions']	nobody	20-59072 20 days ago	20-59142 20 days ago	20-59131 20 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	20-27156 20 days ago	20-27181 20 days ago	168-14895 168 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	20-19423 20 days ago	20-26570 20 days ago	58-75852 58 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	20-5845 20 days ago	27-58270 27 days ago	28-64726 28 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	20-5843 20 days ago	36-58475 1 month ago	36-58492 36 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	19-60730 19 days ago	170-58962 5 months ago	226-19672 226 days
26777	unknown author:unknown	chore(Data/Set/Image): move `BooleanAlgebra` material to `Order`	unknown description	large-import t-data WIP	-1/-1		-1	n/a	[]	nobody	19-43771 19 days ago	unknown	unknown
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	19-20370 19 days ago	59-60692 1 month ago	82-4032 82 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	19-5838 19 days ago	26-60796 26 days ago	53-38152 53 days
29638	yuma-mizuno author:yuma-mizuno	feat(CategoryTheory): define descent data by presieves	--- Addendum: I realized that there is prior work in #24434. Since this PR uses a slightly different definition, I plan to make this PR a follow-up to #24434. Until then, I’ll keep it marked as WIP. See the comment: https://github.com/leanprover-community/mathlib4/pull/29638#issuecomment-3290041719 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory WIP	408/2	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Stack/Basic.lean,Mathlib/CategoryTheory/Stack/Descent.lean	6	4	['chrisflav', 'github-actions', 'yuma-mizuno']	nobody	18-76007 18 days ago	19-51530 19 days ago	0-74 1 minute
29634	YaelDillies author:YaelDillies	feat: missing instance `NonUnitalCommSemiring R → NonUnitalNonAssocCommSemiring R`	For some reason, this causes elaboration issues. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI help-wanted label:t-algebra$	16/7	Mathlib/Algebra/Ring/Defs.lean,Mathlib/RingTheory/Coalgebra/Basic.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/Tactic/Ring/Basic.lean	4	3	['YaelDillies', 'alreadydone', 'github-actions']	nobody	18-66696 18 days ago	19-60851 19 days ago	0-19 19 seconds
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	18-64651 18 days ago	142-47688 4 months ago	227-20712 227 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	18-60664 18 days ago	18-60672 18 days ago	18-60704 18 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	18-48978 18 days ago	31-84769 1 month ago	47-84127 47 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	18-45324 18 days ago	36-60996 1 month ago	131-27043 131 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	18-39639 18 days ago	18-39647 18 days ago	82-53949 82 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	18-38789 18 days ago	22-33220 22 days ago	106-33262 106 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	18-34529 18 days ago	26-3807 26 days ago	26-3784 26 days
29675	yury-harmonic author:yury-harmonic	feat(Wolstenholme): new file	Co-authored-by: @Aristotle-Harmonic --- I still need to cleanup the proof and write the docs. For now, it's just what the AI generated, forward-ported to the latest Mathlib. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author help-wanted	198/0	Mathlib.lean,Mathlib/Data/Nat/Choose/Wolstenholme.lean	2	3	['github-actions', 'yury-harmonic']	nobody	18-29295 18 days ago	18-29295 18 days ago	0-125 2 minutes
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	18-20119 18 days ago	18-20134 18 days ago	18-20170 18 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	18-5848 18 days ago	18-5866 18 days ago	39-60364 39 days
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	17-73626 17 days ago	18-6824 18 days ago	20-32669 20 days
28487	euprunin author:euprunin	chore(RingTheory): golf entire `smul_eq_zero_of_mem`, `hasEval`, `eq_of_prod_eq_prod` and `isIntegral_of_mem_ringOfIntegers`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	7/16	Mathlib/RingTheory/Extension/Basic.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean,Mathlib/RingTheory/UniqueFactorizationDomain/FactorSet.lean,Mathlib/RingTheory/Valuation/AlgebraInstances.lean	4	2	['erdOne', 'github-actions']	erdOne assignee:erdOne	17-60808 17 days ago	17-60808 17 days ago	31-62497 31 days
28772	chrisflav author:chrisflav	feat(RingTheory/IsTensorProduct): add `IsPushout.cancelBaseChange`	This is a cancel-on-the-left version of `AlgebraTensorModule.cancelBaseChange`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	49/0	Mathlib/RingTheory/IsTensorProduct.lean	1	2	['erdOne', 'github-actions']	erdOne assignee:erdOne	17-60798 17 days ago	17-60798 17 days ago	25-4293 25 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	17-47109 17 days ago	17-47587 17 days ago	17-63794 17 days
29720	javra author:javra	feat(CategoryTheory): `TransportEnrichment` and `ForgetEnrichment` as 2-functors	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory WIP	63/1	Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/Enriched/EnrichedCat.lean	2	1	['github-actions']	nobody	17-45582 17 days ago	17-45596 17 days ago	0-24 24 seconds
26357	javra author:javra	feat(CategoryTheory): linear categories as `ModuleCat R`-enriched categories	Continues #23826. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory awaiting-author	197/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/CategoryTheory/Enriched/Linear.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/CategoryTheory/Monoidal/Linear.lean	5	9	['adamtopaz', 'github-actions', 'javra']	adamtopaz assignee:adamtopaz	17-26672 17 days ago	17-26672 17 days ago	78-31643 78 days
29010	grunweg author:grunweg	chore: more tests for field_simp features and edge cases	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		135/0	MathlibTest/FieldSimp.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	17-23610 17 days ago	36-72947 1 month ago	37-56473 37 days
28100	themathqueen author:themathqueen	feat(LinearAlgebra/Matrix): algebra automorphisms on matrices are inner	Characterization of automorphisms on matrices: for any algebra automorphism `f : Matrix n n R ≃ₐ[R] Matrix n n R`, there exists an invertible matrix `T` such that `f a = T * a * T⁻¹` for all `a`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	74/0	Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Basic.lean	1	33	['Whysoserioushah', 'eric-wieser', 'github-actions', 'hrmacbeth', 'mathlib4-merge-conflict-bot', 'themathqueen']	Vierkantor assignee:Vierkantor	17-20513 17 days ago	21-33405 21 days ago	34-16869 34 days
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	17-5863 17 days ago	24-68533 24 days ago	24-69302 24 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	17-5861 17 days ago	31-43173 1 month ago	33-53630 33 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	16-73800 16 days ago	59-35693 1 month ago	73-53225 73 days
27937	madvorak author:madvorak	feat(Logic/Basic): `congr_heq₂`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic awaiting-author	6/0	Mathlib/Logic/Basic.lean	1	8	['YaelDillies', 'fpvandoorn', 'github-actions', 'madvorak', 'vihdzp']	fpvandoorn assignee:fpvandoorn	16-60343 16 days ago	42-61128 1 month ago	17-70200 17 days
29432	lecopivo author:lecopivo	feat: `data_synth` tactic to prove `HasFDerivAt 𝕜 f ?f' x` and similar	New tactic `data_synth` that can prove proposition with holes e.g. figure out what `?f'` is and prove `HasFDerivAt 𝕜 f ?f' x` --- Tactic `data_synth` is designed to synthesize some data that satisfies some proposition. The canonical example is `HasFDerivAt 𝕜 f ?f' x`, this tactic will figure out `f'` and provide proof of `HasFDerivAt 𝕜 f f' x`. Another examples: `HasBoundinbBall s ?center ?radius` or `IsPolynomial f ?p` ``` def HasBoundingBall (s : Set α) (center : α) (radius : ℝ) : Prop := s ⊆ Metric.closedBall center radius def IsPolynomial (f : R → R) (p : Polynomial R) := f = p.eval ```	t-meta WIP	1943/0	Mathlib/Tactic/DataSynth.lean,Mathlib/Tactic/DataSynth/Attr.lean,Mathlib/Tactic/DataSynth/Core.lean,Mathlib/Tactic/DataSynth/Decl.lean,Mathlib/Tactic/DataSynth/Elab.lean,Mathlib/Tactic/DataSynth/FDeriv.lean,Mathlib/Tactic/DataSynth/FDeriv/Basic.lean,Mathlib/Tactic/DataSynth/FDeriv/Dispatch.lean,Mathlib/Tactic/DataSynth/FDeriv/Init.lean,Mathlib/Tactic/DataSynth/FDeriv/Simproc.lean,Mathlib/Tactic/DataSynth/Tests/BoundingBall.lean,Mathlib/Tactic/DataSynth/Tests/Compilation.lean,Mathlib/Tactic/DataSynth/Tests/FDeriv.lean,Mathlib/Tactic/DataSynth/Tests/FDerivInit.lean,Mathlib/Tactic/DataSynth/Tests/FwdDeriv.lean,Mathlib/Tactic/DataSynth/Tests/Normalize.lean,Mathlib/Tactic/DataSynth/Tests/Polynomial.lean,Mathlib/Tactic/DataSynth/Theorems.lean,Mathlib/Tactic/DataSynth/ToBatteries.lean,Mathlib/Tactic/DataSynth/Types.lean	20	3	['JovanGerb', 'github-actions', 'lecopivo']	nobody	16-58463 16 days ago	25-52171 25 days ago	0-11559 3 hours
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	16-53044 16 days ago	16-53065 16 days ago	25-40554 25 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	16-41412 16 days ago	20-23949 20 days ago	116-8182 116 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	16-40584 16 days ago	43-47666 1 month ago	43-49075 43 days
28375	euprunin author:euprunin	chore(Analysis/SpecialFunctions/Pow): golf entire `rpow_lt_rpow_of_exponent_neg`, `rpow_le_rpow_of_exponent_nonpos`, `rpow_le_of_le_log` and `rpow_lt_of_lt_log`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	8/22	Mathlib/Analysis/SpecialFunctions/Pow/Real.lean	1	3	['JonBannon', 'Ruben-VandeVelde', 'github-actions', 'grunweg']	urkud assignee:urkud	16-34235 16 days ago	16-34235 16 days ago	34-46582 34 days
28987	euprunin author:euprunin	chore(Analysis/Distribution): remove redundant `have` in `ae_eq_zero_of_integral_smooth_smul_eq_zero`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	0/2	Mathlib/Analysis/Distribution/AEEqOfIntegralContDiff.lean	1	7	['euprunin', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	hrmacbeth assignee:hrmacbeth	16-34002 16 days ago	16-34002 16 days ago	14-71261 14 days
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	16-33881 16 days ago	29-10598 29 days ago	104-38389 104 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	16-30034 16 days ago	30-25976 1 month ago	30-25953 30 days
29756	Ruben-VandeVelde author:Ruben-VandeVelde	feat: Finsupp.comapDomain_surjective	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-data	9/0	Mathlib/Data/Finsupp/Basic.lean	1	1	['github-actions']	nobody	16-23772 16 days ago	16-23810 16 days ago	16-23845 16 days
25012	urkud author:urkud	refactor(*): migrate from `Matrix.toLin'` to `Matrix.mulVecLin`	or `Matrix.mulVec` whenever we don't need the `LinearEquiv.symm` part. See [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Matrix.2EtoLin'.20vs.20Matrix.2EmulVecLin/with/515188548). It makes sense to have only one normal form, and `Matrix.toLin'` has an extra `DecidableEq` assumption. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		165/126	Mathlib/Algebra/Lie/Matrix.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Finsupp/VectorSpace.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Minpoly.lean,Mathlib/LinearAlgebra/Matrix/Diagonal.lean,Mathlib/LinearAlgebra/Matrix/Gershgorin.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Matrix/ToLinearEquiv.lean,Mathlib/LinearAlgebra/UnitaryGroup.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean	19	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	16-2094 16 days ago	16-2115 16 days ago	31-77068 31 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 awaiting-author	199/0	Mathlib/NumberTheory/SelbergSieve.lean	1	33	['FLDutchmann', 'MichaelStollBayreuth', 'bryangingechen', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	MichaelStollBayreuth assignee:MichaelStollBayreuth	15-60714 15 days ago	15-60714 15 days ago	8-1328 8 days
26961	mariainesdff author:mariainesdff	feat(RingTheory/PowerSeries/Substitution): add API	Co-authored-by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	57/5	Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean	2	13	['Ruben-VandeVelde', 'github-actions', 'mariainesdff', 'mattrobball']	mattrobball assignee:mattrobball	15-54728 15 days ago	15-54728 15 days ago	62-74749 62 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	132/0	Mathlib.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Binomial.lean,Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean	5	13	['ScottCarnahan', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	kbuzzard assignee:kbuzzard	15-27916 15 days ago	50-15307 1 month ago	50-16762 50 days
29761	bwangpj author:bwangpj	feat: Chinese Remainder Theorem for `ZMod n`	Define `ZMod.equivPi`, the Chinese Remainder Theorem for `ZMod n`, decomposing it as a product of `ZMod` over its prime power factors. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	22/0	Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/ZMod/QuotientRing.lean	2	8	['Ruben-VandeVelde', 'bwangpj', 'github-actions', 'j-loreaux']	nobody	15-14517 15 days ago	15-14517 15 days ago	15-65900 15 days
26827	pechersky author:pechersky	feat(Analysis/Normed/ValuativeRel): helper instance for NormedField	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #26713 - [x] depends on: #26826	t-algebra t-analysis t-number-theory label:t-algebra$	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	15-10107 15 days ago	51-38747 1 month ago	88-18063 88 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']	jcommelin assignee:jcommelin	15-5852 15 days ago	22-18391 22 days ago	22-18747 22 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']	dupuisf assignee:dupuisf	15-5846 15 days ago	22-31679 22 days ago	22-32331 22 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']	mattrobball assignee:mattrobball	15-5841 15 days ago	22-12160 22 days ago	22-12278 22 days
29352	fpvandoorn author:fpvandoorn	refactor: simplify dictionary in fixAbbreviation	* Improve capitalization algorithm: you now don't have to give entries twice in `fixAbbreviation` (now `abbreviationDict`). * The new algorithm uses the fact that we can easily find the `lowerCamelCase` name from the `UpperCamelCase` name, namely by applying `String.decapitalizeSeq`. This means that both `nameDict` and `abbreviationDict` have as input `lowerCamelCase` and as output `UpperCamelCase`. * This removes the need to especially fix `NSMul`/`ZSMul` and similar. * `abbreviationDict` still needs two entries if both `snake_case` and either `camelCase` need to be translated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	149/162	Mathlib/Tactic/ToAdditive/GuessName.lean,MathlibTest/toAdditive.lean	2	21	['JovanGerb', 'fpvandoorn', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	bryangingechen assignee:bryangingechen	15-4591 15 days ago	15-4591 15 days ago	11-83619 11 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	810/2	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	12	['JovanGerb', 'github-actions', 'xyzw12345']	JovanGerb assignee:JovanGerb	14-78260 14 days ago	24-82849 24 days ago	72-49926 72 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 awaiting-author	453/1	Mathlib.lean,Mathlib/Data/Set/Accumulate.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/Topology/Compactness/CompactSystem.lean	5	26	['github-actions', 'pfaffelh', 'sgouezel']	PatrickMassot assignee:PatrickMassot	14-54264 14 days ago	14-54264 14 days ago	70-65301 70 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 awaiting-author	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	6	['github-actions', 'sgouezel']	kex-y assignee:kex-y	14-53778 14 days ago	14-53778 14 days ago	31-59168 31 days
26479	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Analysis/Complex/CauchyIntegral): Cauchy–Goursat for Unbounded Rectangles	In this PR, we prove versions of the Cauchy-Goursat theorem where the contours in question are rectangular and unbounded (ie, where the contours look like the $\bigsqcup$ symbol). I am not sure if I have formalised these in the best way, or if `Analysis.Complex.CauchyIntegral` is the best place for them (it might be prudent to reorganise the file into multiple files at some point), but I believe this is a useful result. Suggestions welcome. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	sphere-packing large-import new-contributor t-analysis	201/0	Mathlib/Analysis/Complex/CauchyIntegral.lean	1	1	['github-actions']	nobody	14-46954 14 days ago	14-50514 14 days ago	0-0 0 seconds
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	173/0	Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Integers.lean	2	7	['JovanGerb', 'github-actions', 'mariainesdff', 'mathlib4-merge-conflict-bot', 'pechersky']	mariainesdff assignee:mariainesdff	14-37806 14 days ago	56-28192 1 month ago	89-2704 89 days
26051	Komyyy author:Komyyy	feat(Mathlib/GroupTheory/SpecificGroups/Alternating): A_n is simple iff n = 3 or 5 ≤ n	--- - [x] depends on: #25299 - [x] depends on: #25314 - [x] depends on: #25367 - [x] depends on: #26098 - [x] depends on: #26552 - [x] depends on: #27498 - [x] depends on: #29234 This PR continues the work from #23555. Original PR: https://github.com/leanprover-community/mathlib4/pull/23555 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory large-import WIP	289/71	Mathlib.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/SpecificGroups/Alternating/Simple.lean,Mathlib/GroupTheory/Subgroup/Simple.lean	4	13	['Komyyy', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'tb65536']	nobody	14-32249 14 days ago	31-46564 1 month ago	10-66608 10 days
27500	Komyyy author:Komyyy	feat: the Riemann zeta function is meromorphic	Also proves that the Hurwitz zeta function is meromorphic. This PR is split from #27499 to leave a good git diff history. --- The `large-import` change occurs only in the new module, so it poses no problem. - [x] depends on: #27499 - [x] depends on: #29817 This PR continues the work from #25597. Original PR: https://github.com/leanprover-community/mathlib4/pull/25597	large-import t-analysis WIP	51/3	Mathlib.lean,Mathlib/Analysis/Meromorphic/Complex.lean,Mathlib/Analysis/Meromorphic/Gamma.lean	3	13	['Komyyy', 'github-actions', 'j-loreaux', 'loefflerd', 'mathlib4-dependent-issues-bot']	j-loreaux assignee:j-loreaux	14-25063 14 days ago	14-25485 14 days ago	30-62878 30 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 awaiting-author	8/2	Mathlib/Order/SuccPred/Basic.lean	1	3	['YaelDillies', 'github-actions', 'plp127', 'vihdzp']	bryangingechen assignee:bryangingechen	14-17958 14 days ago	14-17958 14 days ago	44-13238 44 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	6	['ShreckYe', 'bryangingechen', 'eric-wieser', 'github-actions']	bryangingechen assignee:bryangingechen	14-17690 14 days ago	26-53642 26 days ago	26-53685 26 days
27429	smorel394 author:smorel394	feat(RepresentationTheory/FinGroupCharZero): applications of Maschke's theorem	Prove some properties of representations that follow from Maschke's theorem: * If `G` is a finite group whose order is invertible in a field `k`, then every object of `Rep k G` (resp. `FDRep k G`) is injective and projective. * For an object `V` of `FDRep k G`, when `k` is an algebraically closed field in which the order of `G` is invertible: (1) `V` is simple if and only `V ⟶ V` is a `k`-vector space of dimension `1` (`FDRep.simple_iff_end_is_rank_one`); (2) When `k` is characteristic zero, `V` is simple if and only if `∑ g : G, V.character g * V.character g⁻¹ = Fintype.card G` (`FDRep.simple_iff_char_is_norm_one`). Note: This used to be #27165, but it was closed for some reason I don't understand. - [x] depends on: #27154 - [x] depends on: #27134 - [x] depends on: #27125 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	135/0	Mathlib.lean,Mathlib/RepresentationTheory/FinGroupCharZero.lean	2	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	jcommelin assignee:jcommelin	14-5863 14 days ago	21-38000 21 days ago	21-38350 21 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']	urkud assignee:urkud	14-5858 14 days ago	22-37100 22 days ago	22-37139 22 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']	dupuisf assignee:dupuisf	14-5857 14 days ago	21-52041 21 days ago	21-52017 21 days
29047	grunweg author:grunweg	chore(1000.yaml): add Fourier's theorem	Mathlib has some form of it already; while there is space for more advanced versions, let's surface the current progress already. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated	5/1	docs/1000.yaml	1	6	['Ruben-VandeVelde', 'bryangingechen', 'github-actions', 'mathlib-bors', 'mcdoll', 'riccardobrasca']	nobody	13-53319 13 days ago	36-48796 1 month ago	0-17788 4 hours
29235	yoh-tanimoto author:yoh-tanimoto	feat(Topology/Algebra/Module/ClosedSubmodule): add `mapEquiv`, a variation of `ClosedSubmodule.map` for CLE	add `ClosedSubmodule.mapEquiv` for continuous linear equivalence. In this case, a closed submodule is mapped to a closed submodule, 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']	fpvandoorn assignee:fpvandoorn	13-15592 13 days ago	21-35406 21 days ago	21-37692 21 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']	b-mehta assignee:b-mehta	13-5843 13 days ago	22-35271 22 days ago	22-35349 22 days
29776	yuanyi-350 author:yuanyi-350	chore(Functional Analysis) : refactor `ContinuousLinearMap.isOpenMap` by separating it into sublemmas	The open mapping theorem in mathlib proves A ⇒ C by first proving A ⇒ B and then B ⇒ C in one theorem. In my PR, I separated it into two theorems: A ⇒ B and B ⇒ C. And now B ⇒ C is more general, with weaker assumptions than A ⇒ C. The [open mapping theorem](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Normed/Operator/Banach.html#ContinuousLinearMap.isOpenMap) in mathlib need `f` to be surjective. However, this can be weakened to the condition `h : ∃ (n : ℕ) (x : _), x ∈ interior (closure (f '' ball 0 n))` . I need this stronger formulation to prove the closed range theorem c.f. Rudin Functional Analysis Thm 4.13 [zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/refactor.20.60ContinuousLinearMap.2EisOpenMap.60) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author WIP	44/24	Mathlib/Analysis/Normed/Operator/Banach.lean	1	12	['faenuccio', 'github-actions', 'kckennylau', 'leanprover-bot', 'themathqueen', 'yuanyi-350']	faenuccio assignee:faenuccio	12-49879 12 days ago	13-4014 13 days ago	2-46827 2 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 awaiting-author	31/0	Mathlib.lean,Mathlib/Order/UpperLower/WellFounded.lean	2	2	['github-actions', 'plp127']	bryangingechen assignee:bryangingechen	12-49480 12 days ago	12-49480 12 days ago	10-85553 10 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	5	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'themathqueen']	kbuzzard assignee:kbuzzard	12-19430 12 days ago	27-18773 27 days ago	29-41727 29 days
29870	mckoen author:mckoen	feat(CategoryTheory/Adhesive): subobjects in adhesive categories have binary coproducts	A formalization of Theorem 5.1 in https://www.ioc.ee/~pawel/papers/adhesivejournal.pdf. Given `A B Z : C` with `C` adhesive, and `a : A ⟶ Z`, ` b : B ⟶ Z` monomorphisms, then `pushout.desc a b pullback.condition` is also a monomorphism. This result will be useful in showing that the pushout-product of monomorphisms is also a monomorphism. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory WIP	118/0	Mathlib/CategoryTheory/Adhesive.lean	1	1	['github-actions']	nobody	12-13362 12 days ago	12-13409 12 days ago	0-9 9 seconds
29744	espottesmith author:espottesmith	feat(Combinatorics): define directed hypergraphs	This PR defines directed hypergraphs: ``` @[ext] structure DiHypergraph (α : Type*) where /-- The vertex set -/ vertexSet : Set α /-- The edge set -/ edgeSet : Set ((Set α) × (Set α)) /-- Each edge is a pair (s, d), where s ⊆ vertexSet and d ⊆ vertexSet -/ edge_src_dst_isSubset_vertexSet' : ∀ ⦃e⦄, e ∈ edgeSet → e.1 ⊆ vertexSet ∧ e.2 ⊆ vertexSet ``` Additional definitions: - tail/head stars and negative/positive stars - some special cases (B-Graph, F-Graph, BF-Graph, and what I'm calling a "non-endless" dihypergraph, where neither the source/tail nor the destination/head are empty) - Vertex and (hyper)edge adjacency - isolated vertices - empty and nonempty dihypergraphs The design employed here is based off of #28613, but this PR does not depend on that one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	391/0	Mathlib.lean,Mathlib/Combinatorics/DiHypergraph/Basic.lean	2	1	['github-actions']	nobody	11-48323 11 days ago	16-54856 16 days ago	16-54901 16 days
22151	alreadydone author:alreadydone	feat(RingTheory): a semiprimary ring is Noetherian/Artinian iff its Jacobson radical is fg	A key fact used is `Module.FG.smul`: if `I` is a two-sided ideal of `R` that is f.g. as a left ideal and `N` is a f.g. `R`-module, then `I • M` is also a f.g. `R`-module. Many lemmas about coprimality of ideals are also generalized to the noncommutative, two-sided setting. --- - [x] depends on: #21904 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	233/166	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	10	['alreadydone', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	eric-wieser assignee:eric-wieser	11-23194 11 days ago	11-23260 11 days ago	191-22314 191 days
29827	js2357 author:js2357	feat: define two (trivial) ContinuousMulEquivs	Define two trivial `ContinuousMulEquiv`s: `ContinuousMulEquiv.piUnique` is the topological version of `MulEquiv.piUnique`. `ContinuousMulEquiv.piEquivPiSubtypeProd` is the multiplicative version of `Homeomorph.piEquivPiSubtypeProd`. Done for the FLT project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import FLT new-contributor t-topology	25/0	Mathlib/Topology/Algebra/ContinuousMonoidHom.lean	1	2	['github-actions', 'grunweg']	nobody	11-20807 11 days ago	13-57944 13 days ago	14-127 14 days
29899	eric-wieser author:eric-wieser	chore: add `=Q` arguments to ring casting operations	This also detects an `isDefeq` which is unifying across universes and types, which I remember rumors about being sometimes a bad idea. I'm a little worried that the `=Q` design here runs into DTT hell, but it works in the one place that is "Qq-clean" right now, so I'd be inclined to apply it to help us learn more about the pattern in future. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	36/23	Mathlib/Tactic/Ring/Basic.lean	1	1	['github-actions']	nobody	11-8796 11 days ago	11-8807 11 days ago	0-0 0 seconds
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$	176/0	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	15	['github-actions', 'joelriou', 'kbuzzard', 'kckennylau', 'kim-em', 'xyzw12345']	joelriou assignee:joelriou	11-8182 11 days ago	11-8182 11 days ago	22-38383 22 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']	Vierkantor assignee:Vierkantor	11-5856 11 days ago	18-45415 18 days ago	20-23767 20 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	118/0	Mathlib.lean,Mathlib/Geometry/Euclidean/Angle/Bisector.lean	2	7	['eric-wieser', 'github-actions', 'jsm28']	JovanGerb assignee:JovanGerb	11-5854 11 days ago	19-5977 19 days ago	19-5954 19 days
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']	joneugster assignee:joneugster	11-5852 11 days ago	18-20568 18 days ago	18-20545 18 days
29582	YaelDillies author:YaelDillies	chore: rename `_root_.prop` to `Prop.finite`	This was a surprising name! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-zulip	1/1	Mathlib/Data/Fintype/EquivFin.lean	1	11	['YaelDillies', 'bryangingechen', 'eric-wieser', 'github-actions', 'grunweg', 'plp127']	nobody	10-80704 10 days ago	10-80705 10 days ago	3-1360 3 days
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 awaiting-author	312/0	Mathlib.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/Sites/BigAffineZariski.lean	3	32	['chrisflav', 'github-actions', 'joelriou', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	10-60124 10 days ago	10-60124 10 days ago	4-4834 4 days
29458	LiamSchilling author:LiamSchilling	feat(MvPolynomial/WeightedHomogenous): relate `weightedTotalDegree` to `degrees`, `totalDegree`, and `degreeOf`	`weightedTotalDegree` is the most general notion of multivariate degree in mathlib. These theorems show that it specializes to `degrees`, `totalDegree`, and `degreeOf` with specialized weights. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor awaiting-author	24/1	Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean	1	5	['chrisflav', 'github-actions']	chrisflav assignee:chrisflav	10-58892 10 days ago	10-58892 10 days ago	14-19311 14 days
26660	strihanje01 author:strihanje01	feat(Combinatorics/Additive/VerySmallDoubling): weak non-commutative Kneser's theorem	add theorem about the structure of a doubling smaller than the golden ratio --- - [x] depends on: #28653 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import maintainer-merge new-contributor t-combinatorics	215/41	Mathlib/Algebra/Group/Action/Pointwise/Finset.lean,Mathlib/Combinatorics/Additive/VerySmallDoubling.lean	2	79	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'strihanje01']	YaelDillies assignee:YaelDillies	10-48371 10 days ago	10-81020 10 days ago	52-22996 52 days
29806	adomani author:adomani	feat: add some name validation for authors	The check consists of verifying that each file has at least one Copyright holder and one Author. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter	64/5	Mathlib/Probability/HasLaw.lean,Mathlib/Tactic/Linter/Header.lean,MathlibTest/Header.lean	3	10	['adomani', 'github-actions', 'grunweg']	grunweg assignee:grunweg	10-45743 10 days ago	12-40474 12 days ago	13-40446 13 days
27323	kckennylau author:kckennylau	chore: make the arguments of fiberInclusion explicit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	18/17	Mathlib/CategoryTheory/FiberedCategory/Fiber.lean,Mathlib/CategoryTheory/FiberedCategory/HasFibers.lean	2	2	['github-actions', 'joelriou']	nobody	10-44840 10 days ago	74-61406 2 months ago	74-61407 74 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$	209/4	Mathlib.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/ENat/Pow.lean,Mathlib/SetTheory/Cardinal/Finite.lean	4	21	['D-Thomine', 'eric-wieser', 'github-actions', 'kbuzzard', 'mathlib4-merge-conflict-bot']	kbuzzard assignee:kbuzzard	10-44159 10 days ago	10-44186 10 days ago	73-17414 73 days
28175	dsfxcimk author:dsfxcimk	feat: exterior angle theorem	Add Exterior angle theorem --- The Exterior Angle Theorem states that the exterior angle of a triangle equals the sum of the two non-adjacent interior angles. I plan to place this in Mathlib.Geometry.Euclidean.Triangle [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-euclidean-geometry awaiting-author	10/0	Mathlib/Geometry/Euclidean/Triangle.lean,docs/1000.yaml	2	16	['FrankieNC', 'JovanGerb', 'dsfxcimk', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'themathqueen']	nobody	10-35715 10 days ago	24-48582 24 days ago	28-57160 28 days
25799	dagurtomas author:dagurtomas	feat(CategoryTheory): the universal property of localized monoidal categories	This PR provides a monoidal structure on any functor out of a localized monoidal category whose precomposition with the localization functor is monoidal --- - [x] depends on: #29564 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24727. Original PR: https://github.com/leanprover-community/mathlib4/pull/24727	file-removed t-category-theory	244/2	Mathlib.lean,Mathlib/CategoryTheory/Localization/Bifunctor.lean,Mathlib/CategoryTheory/Localization/Monoidal/Basic.lean,Mathlib/CategoryTheory/Localization/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Multifunctor.lean,Mathlib/CategoryTheory/Monoidal/NaturalTransformation.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean	8	20	['dagurtomas', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	TwoFX assignee:TwoFX	10-31596 10 days ago	10-34623 10 days ago	25-24296 25 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 awaiting-author	32/0	Mathlib/Analysis/SpecialFunctions/ExpDeriv.lean	1	4	['Paul-Lez', 'eric-wieser', 'github-actions', 'j-loreaux']	j-loreaux assignee:j-loreaux	10-30927 10 days ago	10-31206 10 days ago	15-76317 15 days
29624	mcdoll author:mcdoll	feat(LinearAlgebra/LinearPMap): add definition of resolvent and first resolvent identity	--- [![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']	kim-em assignee:kim-em	10-19620 10 days ago	18-30571 18 days ago	18-30548 18 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 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	597/276	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	13	['JovanGerb', 'bryangingechen', 'github-actions', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	10-13474 10 days ago	10-14211 10 days ago	35-44781 35 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	29/15	Counterexamples/AharoniKorman.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/Topology/Separation/Hausdorff.lean	4	18	['NotWearingPants', 'eric-wieser', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	10-8868 10 days ago	21-29352 21 days ago	39-44291 39 days
29920	urkud author:urkud	feat: separable but not second countable LOTS	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	55/0	Counterexamples.lean,Counterexamples/SeparableNotSecondCountable.lean,Mathlib/Data/Prod/Lex.lean	3	1	['github-actions']	nobody	10-6413 10 days ago	10-14897 10 days ago	10-14930 10 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']	grunweg assignee:grunweg	10-5850 10 days ago	17-51867 17 days ago	17-51905 17 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	5	['YaelDillies', 'github-actions', 'plp127']	mattrobball assignee:mattrobball	9-74532 9 days ago	22-73304 22 days ago	22-74706 22 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 `range p ≤ range q`, 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 awaiting-author	47/0	Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean	2	11	['github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen']	j-loreaux assignee:j-loreaux	9-72930 9 days ago	10-23630 10 days ago	39-54916 39 days
27817	zhuyizheng author:zhuyizheng	feat: add IMO2025P1	Add a solution to IMO2025P1, the original problem statement from https://github.com/jsm28/IMOLean --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO new-contributor	1310/0	Archive.lean,Archive/Imo/Imo2025Q1.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	dwrensha assignee:dwrensha	9-55374 9 days ago	14-74846 14 days ago	47-13552 47 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. ---	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	9-51869 9 days ago	30-37985 1 month ago	30-38020 30 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	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	9-51799 9 days ago	30-48767 1 month ago	66-53348 66 days
26396	xroblot author:xroblot	feat(RingTheory): define the dual of a basis for the trace and prove basic properties	Specialize the construction of `BilinForm.dualBasis` to the case of the trace and proves basic results about it. This will be useful for future works on the [Submodule.traceDual](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/DedekindDomain/Different.html#Submodule.traceDual) ---	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	9-51571 9 days ago	18-44873 18 days ago	99-12494 99 days
26155	xroblot author:xroblot	feat(DedekindDomain/Different): add the transitivity formula	This PR proves the transitivity formula for the different ideal. The PR also adds one new instance: - `FiniteDimensional (FractionRing A) (FractionRing B)` deduced from `Module.Finite A B` when `B` is a Dedekind domain. ---	t-algebra label:t-algebra$	177/10	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	9-51535 9 days ago	29-67112 29 days ago	101-73960 101 days
29588	Periecle author:Periecle	feat(Analysis/Complex/Residue): Implement residue theory for complex functions at isolated singularities	# Add basic residue theory for complex functions This PR introduces the residue theory implementation in mathlib. ## Main additions - `HasIsolatedSingularityAt f c`: Predicate for functions with isolated singularities at point `c` - `residue f c hf`: The residue of `f` at isolated singularity `c`, defined via circle integrals - Radius independence: `residue_eq_two_pi_I_inv_smul_circleIntegral` - residue equals normalized circle integral for any valid radius - Holomorphic residues: `residue_of_holomorphic` - functions holomorphic in a neighborhood have zero residue - Simple pole formula: `residue_simple_pole` - for `f(z) = (z-c)⁻¹ * g(z)`, residue equals `g(c)` ## Implementation notes - Builds on existing circle integral infrastructure in `CauchyIntegral.lean` - Uses `Classical.choose` to extract witness radius from isolated singularity condition - Comprehensive documentation with mathematical context and examples - Establishes foundation for residue theorem, argument principle, and other applications ## Examples included - `residue(1/z, 0) = 1` (canonical simple pole) - Radius independence demonstration - Zero residues for holomorphic functions This provides the essential building blocks for complex analysis and first step to formalize residue theory.	new-contributor t-analysis awaiting-author	383/0	Mathlib/Analysis/Complex/Residue/Basic.lean	1	17	['Periecle', 'github-actions', 'hrmacbeth', 'llllvvuu', 'loefflerd']	nobody	9-44106 9 days ago	20-46209 20 days ago	1-5255 1 day
26071	linesthatinterlace author:linesthatinterlace	feat: Add `id` and `comp` classes for `FunLike` and `refl`, `trans` and `symm` classes for `EquivLike`	Adds classes depending on `FunLike` that capture "this has an identity/this has a notion of composition". --- This is a prototype and comments on this are requested. I think a similar model could be used to create a generalisation for Equiv.symm. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor RFC WIP	314/23	Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/FunLike/Equiv.lean,Mathlib/Logic/Equiv/Defs.lean	3	21	['Rob23oba', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	9-40373 9 days ago	9-40429 9 days ago	0-1 1 second
28871	JaafarTanoukhi author:JaafarTanoukhi	feat(Combinatorics/Digraph): Tournaments	Define orientations and tournaments. Related to #26771. Co-authored-by: Rida Hamadani --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	62/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Digraph/Tournament.lean	3	5	['JaafarTanoukhi', 'NotWearingPants', 'Rida-Hamadani', 'github-actions']	kmill assignee:kmill	9-35507 9 days ago	40-25744 1 month ago	40-25778 40 days
28497	euprunin author:euprunin	chore: golf entire `isLocalHom_residue`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	2/7	Mathlib/RingTheory/LocalRing/ResidueField/Basic.lean	1	4	['Ruben-VandeVelde', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	9-29429 9 days ago	9-29465 9 days ago	1-84232 1 day
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	9-26821 9 days ago	25-20993 25 days ago	38-36905 38 days
29949	adomani author:adomani	test: remove deprecated declarations	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter awaiting-author WIP	180/0	Mathlib.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/RemoveDeprecations.lean,lakefile.lean	5	2	['adomani', 'github-actions']	bryangingechen assignee:bryangingechen	9-21603 9 days ago	9-21610 9 days ago	0-0 0 seconds
25905	mans0954 author:mans0954	feat(RingTheory/Polynomial/SmallDegreeVieta): polynomial versions of results in Algebra.QuadraticDiscriminant	This PR continues the work from #25605. Original PR: https://github.com/leanprover-community/mathlib4/pull/25605	t-ring-theory awaiting-author	77/8	Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/RingTheory/Polynomial/SmallDegreeVieta.lean	2	46	['chrisflav', 'github-actions', 'kckennylau', 'mans0954', 'ocfnash']	chrisflav assignee:chrisflav	9-19669 9 days ago	10-61084 10 days ago	82-34290 82 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	9	['chrisflav', 'eric-wieser', 'github-actions', 'ocfnash', 'xyzw12345']	mattrobball assignee:mattrobball	9-5854 9 days ago	60-32241 1 month ago	75-43556 75 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']	joneugster assignee:joneugster	9-5852 9 days ago	16-72191 16 days ago	22-35325 22 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']	kim-em assignee:kim-em	9-5850 9 days ago	16-45807 16 days ago	20-58728 20 days
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']	joneugster assignee:joneugster	9-5847 9 days ago	17-39744 17 days ago	17-39778 17 days
29955	qawbecrdtey author:qawbecrdtey	feat(Data/Set/Subsingleton): added new lemma `Subsingleton.union_subsingleton` along with some trivial code cleanup	--- Added a lemma which implies both sets are subsingleton if their union is subsingleton. ```lean lemma Subsingleton.union_subsingleton (h : (s ∪ t).Subsingleton) : s.Subsingleton ∧ t.Subsingleton ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	9/3	Mathlib/Data/Set/Subsingleton.lean	1	1	['github-actions']	nobody	8-86007 8 days ago	8-86020 8 days ago	8-86056 8 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 awaiting-author	53/0	Mathlib.lean,Mathlib/Topology/Algebra/Group/Units.lean	2	7	['Ruben-VandeVelde', 'github-actions', 'kim-em', 'plp127']	ADedecker assignee:ADedecker	8-64192 8 days ago	10-2538 10 days ago	7-43192 7 days
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/)	easy	0/3	Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Data/List/Range.lean	2	5	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	RemyDegenne assignee:RemyDegenne	8-64118 8 days ago	8-64118 8 days ago	31-71759 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 easy	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	8-64071 8 days ago	8-64071 8 days ago	47-33523 47 days
28490	euprunin author:euprunin	chore: golf entire `epi_of_cokernel_π_eq_zero`, `bottom_row_coprime`, `congr_of_eventuallyEq` and `Invertible.congr`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	easy	8/12	Mathlib/Algebra/Group/Invertible/Defs.lean,Mathlib/CategoryTheory/Abelian/Basic.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/Topology/ContinuousOn.lean	4	1	['github-actions']	kex-y assignee:kex-y	8-64038 8 days ago	8-64038 8 days ago	42-25804 42 days
28260	euprunin author:euprunin	chore(Analysis/Fourier): golf entire `fourier_zero` and `fourier_zero'` using `simp`	--- Show trace profiling of `fourier_zero` ### Trace profiling of `fourier_zero` before PR 28260 ```diff diff --git a/Mathlib/Analysis/Fourier/AddCircle.lean b/Mathlib/Analysis/Fourier/AddCircle.lean index 6238f58476..99dbb05621 100644 --- a/Mathlib/Analysis/Fourier/AddCircle.lean +++ b/Mathlib/Analysis/Fourier/AddCircle.lean @@ -126,2 +126,3 @@ theorem fourier_coe_apply' {n : ℤ} {x : ℝ} : -- simp normal form is `fourier_zero'` +set_option trace.profiler true in theorem fourier_zero {x : AddCircle T} : fourier 0 x = 1 := by ``` ``` ℹ [2482/2482] Built Mathlib.Analysis.Fourier.AddCircle info: Mathlib/Analysis/Fourier/AddCircle.lean:128:0: [Elab.async] [0.066690] elaborating proof of fourier_zero [Elab.definition.value] [0.066228] fourier_zero [Elab.step] [0.065930] induction x using QuotientAddGroup.induction_on simp only [fourier_coe_apply] norm_num [Elab.step] [0.065922] induction x using QuotientAddGroup.induction_on simp only [fourier_coe_apply] norm_num [Elab.step] [0.055636] simp only [fourier_coe_apply] Build completed successfully. ``` ### Trace profiling of `fourier_zero` after PR 28260 ```diff diff --git a/Mathlib/Analysis/Fourier/AddCircle.lean b/Mathlib/Analysis/Fourier/AddCircle.lean index 6238f58476..0542519008 100644 --- a/Mathlib/Analysis/Fourier/AddCircle.lean +++ b/Mathlib/Analysis/Fourier/AddCircle.lean @@ -126,10 +126,8 @@ theorem fourier_coe_apply' {n : ℤ} {x : ℝ} : -- simp normal form is `fourier_zero'` +set_option trace.profiler true in theorem fourier_zero {x : AddCircle T} : fourier 0 x = 1 := by - induction x using QuotientAddGroup.induction_on - simp only [fourier_coe_apply] - norm_num + simp -theorem fourier_zero' {x : AddCircle T} : @toCircle T 0 = (1 : ℂ) := by - have : fourier 0 x = @toCircle T 0 := by rw [fourier_apply, zero_smul] - rw [← this]; exact fourier_zero +theorem fourier_zero' : @toCircle T 0 = (1 : ℂ) := by + simp ``` ``` ℹ [2482/2482] Built Mathlib.Analysis.Fourier.AddCircle info: Mathlib/Analysis/Fourier/AddCircle.lean:128:0: [Elab.async] [0.041217] elaborating proof of fourier_zero [Elab.definition.value] [0.040843] fourier_zero [Elab.step] [0.040316] simp [Elab.step] [0.040305] simp [Elab.step] [0.040291] simp [Meta.isDefEq] [0.013042] ✅️ 0 • ?m =?= 0 • x [Meta.isDefEq] [0.010734] ✅️ instHSMul =?= instHSMul [Meta.isDefEq.delta] [0.010705] ✅️ instHSMul =?= instHSMul [Meta.synthInstance] [0.010613] ✅️ SMulWithZero ℤ (AddCircle T) [Meta.synthInstance] [0.010175] ✅️ apply @AddGroup.intSMulWithZero to SMulWithZero ℤ (AddCircle T) [Meta.synthInstance.tryResolve] [0.010141] ✅️ SMulWithZero ℤ (AddCircle T) ≟ SMulWithZero ℤ (AddCircle T) [Meta.isDefEq] [0.010882] ❌️ ↑1 =?= ↑1 Build completed successfully. ``` --- Show trace profiling of `fourier_zero'` ### Trace profiling of `fourier_zero'` before PR 28260 ```diff diff --git a/Mathlib/Analysis/Fourier/AddCircle.lean b/Mathlib/Analysis/Fourier/AddCircle.lean index 6238f58476..c97c6382dd 100644 --- a/Mathlib/Analysis/Fourier/AddCircle.lean +++ b/Mathlib/Analysis/Fourier/AddCircle.lean @@ -131,2 +131,3 @@ theorem fourier_zero {x : AddCircle T} : fourier 0 x = 1 := by +set_option trace.profiler true in theorem fourier_zero' {x : AddCircle T} : @toCircle T 0 = (1 : ℂ) := by ``` ``` ℹ [2482/2482] Built Mathlib.Analysis.Fourier.AddCircle info: Mathlib/Analysis/Fourier/AddCircle.lean:133:0: [Elab.command] [0.040228] theorem fourier_zero' {x : AddCircle T} : @toCircle T 0 = (1 : ℂ) := by have : fourier 0 x = @toCircle T 0 := by rw [fourier_apply, zero_smul] rw [← this]; exact fourier_zero [Elab.definition.header] [0.039678] fourier_zero' [Elab.step] [0.039292] expected type: Sort ?u.10460, term @toCircle T 0 = (1 : ℂ) [Elab.step] [0.039281] expected type: Sort ?u.10460, term binrel% Eq✝ (@toCircle T 0) (1 : ℂ) [Meta.synthInstance] [0.023079] ❌️ CoeT ℂ x Circle info: Mathlib/Analysis/Fourier/AddCircle.lean:133:0: [Elab.async] [0.050645] elaborating proof of fourier_zero' [Elab.definition.value] [0.049639] fourier_zero' [Elab.step] [0.049079] have : fourier 0 x = @toCircle T 0 := by rw [fourier_apply, zero_smul] rw [← this]; exact fourier_zero [Elab.step] [0.049067] have : fourier 0 x = @toCircle T 0 := by rw [fourier_apply, zero_smul] rw [← this]; exact fourier_zero [Elab.step] [0.047714] have : fourier 0 x = @toCircle T 0 := by rw [fourier_apply, zero_smul] [Elab.step] [0.047690] focus refine no_implicit_lambda% (have : fourier 0 x = @toCircle T 0 := ?body✝; ?_) case body✝ => with_annotate_state"by" (rw [fourier_apply, zero_smul]) [Elab.step] [0.047680] refine no_implicit_lambda% (have : fourier 0 x = @toCircle T 0 := ?body✝; ?_) case body✝ => with_annotate_state"by" (rw [fourier_apply, zero_smul]) [Elab.step] [0.047675] refine no_implicit_lambda% (have : fourier 0 x = @toCircle T 0 := ?body✝; ?_) case body✝ => with_annotate_state"by" (rw [fourier_apply, zero_smul]) [Elab.step] [0.016566] refine no_implicit_lambda% (have : fourier 0 x = @toCircle T 0 := ?body✝; ?_) [Elab.step] [0.016520] expected type: ↑(toCircle 0) = 1, term no_implicit_lambda% (have : fourier 0 x = @toCircle T 0 := ?body✝; ?_) [Elab.step] [0.016512] expected type: ↑(toCircle 0) = 1, term (have : fourier 0 x = @toCircle T 0 := ?body✝; ?_) [Elab.step] [0.016502] expected type: ↑(toCircle 0) = 1, term have : fourier 0 x = @toCircle T 0 := ?body✝; ?_ [Elab.step] [0.016409] expected type: Sort ?u.12245, term fourier 0 x = @toCircle T 0 [Elab.step] [0.016398] expected type: Sort ?u.12245, term binrel% Eq✝ (fourier 0 x) (@toCircle T 0) [Elab.step] [0.031091] case body✝ => with_annotate_state"by" (rw [fourier_apply, zero_smul]) [Elab.step] [0.031024] with_annotate_state"by" (rw [fourier_apply, zero_smul]) [Elab.step] [0.031018] with_annotate_state"by" (rw [fourier_apply, zero_smul]) [Elab.step] [0.031012] with_annotate_state"by" (rw [fourier_apply, zero_smul]) [Elab.step] [0.031006] (rw [fourier_apply, zero_smul]) [Elab.step] [0.031000] rw [fourier_apply, zero_smul] [Elab.step] [0.030995] rw [fourier_apply, zero_smul] [Elab.step] [0.030987] rw [fourier_apply, zero_smul] [Elab.step] [0.030977] (rewrite [fourier_apply, zero_smul]; with_annotate_state"]" (try (with_reducible rfl))) [Elab.step] [0.030972] rewrite [fourier_apply, zero_smul]; with_annotate_state"]" (try (with_reducible rfl)) [Elab.step] [0.030964] rewrite [fourier_apply, zero_smul]; with_annotate_state"]" (try (with_reducible rfl)) [Elab.step] [0.026599] rewrite [fourier_apply, zero_smul] [Meta.isDefEq] [0.016855] ✅️ 0 • x =?= 0 • ?m [Meta.isDefEq] [0.015512] ✅️ instHSMul =?= instHSMul [Meta.isDefEq.delta] [0.015494] ✅️ instHSMul =?= instHSMul [Meta.synthInstance] [0.015404] ✅️ SMulWithZero ℤ (AddCircle T) [Meta.synthInstance] [0.014948] ✅️ apply @AddGroup.intSMulWithZero to SMulWithZero ℤ (AddCircle T) [Meta.synthInstance.tryResolve] [0.014922] ✅️ SMulWithZero ℤ (AddCircle T) ≟ SMulWithZero ℤ (AddCircle T) [Meta.isDefEq] [0.014466] ✅️ SMulWithZero ℤ (AddCircle T) =?= SMulWithZero ℤ ?m.13159 [Meta.synthInstance] [0.010847] ✅️ Zero (AddCircle T) Build completed successfully. ``` ### Trace profiling of `fourier_zero'` after PR 28260 ```diff diff --git a/Mathlib/Analysis/Fourier/AddCircle.lean b/Mathlib/Analysis/Fourier/AddCircle.lean index 6238f58476..f13a398896 100644 --- a/Mathlib/Analysis/Fourier/AddCircle.lean +++ b/Mathlib/Analysis/Fourier/AddCircle.lean @@ -127,9 +127,7 @@ theorem fourier_coe_apply' {n : ℤ} {x : ℝ} : theorem fourier_zero {x : AddCircle T} : fourier 0 x = 1 := by - induction x using QuotientAddGroup.induction_on - simp only [fourier_coe_apply] - norm_num + simp -theorem fourier_zero' {x : AddCircle T} : @toCircle T 0 = (1 : ℂ) := by - have : fourier 0 x = @toCircle T 0 := by rw [fourier_apply, zero_smul] - rw [← this]; exact fourier_zero +set_option trace.profiler true in +theorem fourier_zero' : @toCircle T 0 = (1 : ℂ) := by + simp ``` ``` ℹ [2482/2482] Built Mathlib.Analysis.Fourier.AddCircle info: Mathlib/Analysis/Fourier/AddCircle.lean:131:0: [Elab.command] [0.045555] theorem fourier_zero' : @toCircle T 0 = (1 : ℂ) := by simp [Elab.definition.header] [0.044962] fourier_zero' [Elab.step] [0.044931] expected type: Sort ?u.10311, term @toCircle T 0 = (1 : ℂ) [Elab.step] [0.044920] expected type: Sort ?u.10311, term binrel% Eq✝ (@toCircle T 0) (1 : ℂ) [Meta.synthInstance] [0.031268] ❌️ CoeT ℂ x Circle info: Mathlib/Analysis/Fourier/AddCircle.lean:131:0: [Elab.async] [0.027859] elaborating proof of fourier_zero' [Elab.definition.value] [0.027542] fourier_zero' [Elab.step] [0.027179] simp [Elab.step] [0.027169] simp [Elab.step] [0.027156] simp [Meta.isDefEq] [0.011252] ❌️ ↑1 =?= ↑1 [Meta.isDefEq.delta] [0.010804] ❌️ ↑1 =?= ↑1 [Meta.isDefEq] [0.010774] ❌️ 1 =?= 1 [Meta.isDefEq] [0.010717] ❌️ { x // 0 ≤ x } =?= Circle [Meta.isDefEq] [0.010706] ❌️ { x // 0 ≤ x } =?= ↥(Submonoid.unitSphere ℂ) [Meta.isDefEq] [0.010684] ❌️ fun x ↦ 0 ≤ x =?= fun x ↦ x ∈ Submonoid.unitSphere ℂ [Meta.isDefEq] [0.010675] ❌️ 0 ≤ x =?= x ∈ Submonoid.unitSphere ℂ Build completed successfully. ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis easy delegated	3/6	Mathlib/Analysis/Fourier/AddCircle.lean	1	4	['eric-wieser', 'euprunin', 'github-actions', 'mathlib-bors']	nobody	8-64009 8 days ago	8-64009 8 days ago	0-15279 4 hours
29947	JaafarTanoukhi author:JaafarTanoukhi	feat(Combinatorics/Digraph): Maps	Ported `SimpleGraph/Maps.lean` to `Digraph/Maps.lean` for future PRs related to issue #[26771](https://github.com/leanprover-community/mathlib4/issues/26771) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	476/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Maps.lean	2	1	['github-actions']	nobody	8-62686 8 days ago	9-35789 9 days ago	9-35829 9 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 delegated	142/2	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramMatrix.lean,Mathlib/MeasureTheory/Function/L2Space.lean	3	42	['EtienneC30', 'eric-wieser', 'github-actions', 'mathlib-bors', 'pfaffelh', 'sgouezel']	hrmacbeth assignee:hrmacbeth	8-61141 8 days ago	8-61141 8 days ago	78-69916 78 days
29965	RemyDegenne author:RemyDegenne	feat(probability): define subtraction of kernels	This PR defines subtraction of kernels and uses it to prove `MeasurableSet {a \| κ a = η a}` for two finite kernels `κ, η`. From the LeanBandits project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability WIP	288/1	Mathlib.lean,Mathlib/MeasureTheory/Measure/Sub.lean,Mathlib/MeasureTheory/Measure/SubFinite.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Kernel/RadonNikodym.lean,Mathlib/Probability/Kernel/Sub.lean	6	1	['github-actions']	nobody	8-60583 8 days ago	8-63673 8 days ago	0-1 1 second
29855	eric-wieser author:eric-wieser	chore(Data/Finset/Sort): lemmas about `0 : Fin _` and `Fin.last _`	We already had these for `⟨0, ⋯⟩` and `⟨k - 1, ⋯⟩`. Moves: - `Finset.orderEmbOfFin_zero` -> `Finset.orderEmbOfFin_mk_zero` - `Finset.orderEmbOfFin_last` -> `Finset.orderEmbOfFin_mk_last` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-order easy delegated	17/7	Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Data/Finset/Sort.lean	2	4	['eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	nobody	8-57659 8 days ago	8-57659 8 days ago	3-79002 3 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 FLT new-contributor	97/0	Mathlib/GroupTheory/DoubleCoset.lean	1	16	['Ruben-VandeVelde', 'WilliamCoram', 'github-actions', 'mathlib4-merge-conflict-bot']	mariainesdff assignee:mariainesdff	8-56887 8 days ago	15-32532 15 days ago	74-12007 74 days
29798	Cyantain author:Cyantain	feat(FieldTheory/IsIntegrallyClosed): lemma to judge whether an element is integral	In this PR, we proved that an element is integral iff it's root of irreducible polynomial with unit leading coeff, which is an easy way to judge an element is integral or not, such as $\sqrt 5 / 4$, because it's root of $16x^2-5$ with not unit leading coeff, so it's not integral.	new-contributor t-algebra delegated label:t-algebra$	13/0	Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean	1	8	['Ruben-VandeVelde', 'adomani', 'github-actions', 'kckennylau', 'mathlib-bors', 'riccardobrasca']	nobody	8-49705 8 days ago	8-49705 8 days ago	6-29891 6 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/)	awaiting-author	90/50	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	17	['chrisflav', 'github-actions', 'grunweg', 'kim-em', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	8-41788 8 days ago	8-41788 8 days ago	48-60022 48 days
29933	smmercuri author:smmercuri	chore: fix `def` naming isses in `Normed/Field/WithAbs.lean`	--- - [x] depends on: #29932 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	33/23	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Completion.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	8-37467 8 days ago	8-37467 8 days ago	1-17350 1 day
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/)	maintainer-merge t-topology	38/0	Mathlib/Topology/LocallyFinsupp.lean	1	18	['Raph-DG', 'chrisflav', 'github-actions', 'jcommelin', 'kckennylau']	jcommelin assignee:jcommelin	8-36529 8 days ago	8-61845 8 days ago	97-25833 97 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	8-35561 8 days ago	26-18489 26 days ago	26-18482 26 days
29526	llllvvuu author:llllvvuu	feat: `Multiset.map f` identifies `f` up to permutation	Motivation: Reason about `Fintype`-indexed families via `Multiset` equality. Example use case 1: ```lean theorem Matrix.IsHermitian.cfc_eigenvalues {d : Type} [Fintype d] [DecidableEq d] {M : Matrix d d 𝕜} (hM : M.IsHermitian) (f : ℝ → ℝ) (hcfc : Matrix.IsHermitian (cfc f M) := cfc_predicate f M) : ∃ (e : d ≃ d), hcfc.eigenvalues = f ∘ hM.eigenvalues ∘ e := by have := hcfc.roots_charpoly_eq_eigenvalues.symm rw [hM.charpoly_cfc_eq f, Polynomial.roots_prod] at this; swap · simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero] simp_rw [Polynomial.roots_X_sub_C, Multiset.bind_singleton] at this have he := (Multiset.compTriple_equivOfMapUnivEq this).comp_eq simp_rw [← Function.comp_def RCLike.ofReal, ← Function.comp_def f, Function.comp_assoc] at he exact ⟨_, RCLike.ofReal_injective.comp_left he.symm⟩ ``` Example use case 2 (on top of https://github.com/leanprover-community/mathlib4/pull/29610): ```lean theorem LinearMap.Eigenbasis.μ_equiv {ι ι' R G : Type} [Fintype ι] [Fintype ι'] [CommRing R] [IsDomain R] [AddCommGroup G] [Module R G] [Module.Free R G] [Module.Finite R G] {f : Module.End R G} (B₁ : f.Eigenbasis ι) (B₂ : f.Eigenbasis ι') : ∃ e : ι ≃ ι', B₁.μ = B₂.μ ∘ e := by classical have := congr(Polynomial.roots $(B₁.charpoly_eq.symm.trans B₂.charpoly_eq)) rw [Polynomial.roots_prod, Polynomial.roots_prod] at this; rotate_left · simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero] · simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero] simp_rw [Polynomial.roots_X_sub_C, Multiset.bind_singleton] at this exact ⟨Multiset.equivOfMapUnivEq this, (Multiset.compTriple_equivOfMapUnivEq this).comp_eq.symm⟩ ``` Co-authored-by: Aristotle Harmonic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	35/0	Mathlib/Data/Multiset/Fintype.lean	1	8	['Ruben-VandeVelde', 'github-actions', 'llllvvuu', 'vihdzp', 'wwylele']	nobody	8-35229 8 days ago	23-4259 23 days ago	23-4252 23 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 awaiting-author	71/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/CategoryTheory/Types/Monomorphisms.lean	3	7	['dagurtomas', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	TwoFX assignee:TwoFX	8-15110 8 days ago	8-15110 8 days ago	27-18061 27 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 maintainer-merge	451/3	Mathlib.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/PNat.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/GroupTheory/DivisibleHull.lean	6	106	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp', 'wwylele']	tb65536 assignee:tb65536	8-5852 8 days ago	15-31729 15 days ago	25-8929 25 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/)	t-meta	40/0	Mathlib/Tactic/Linter/UnusedTactic.lean,Mathlib/Tactic/Linter/UnusedTacticExtension.lean,Mathlib/Tactic/Says.lean,MathlibTest/says.lean	4	3	['JovanGerb', 'MichaelStollBayreuth', 'github-actions']	JovanGerb assignee:JovanGerb	8-5851 8 days ago	15-64225 15 days ago	23-83772 23 days
29765	YaelDillies author:YaelDillies	feat: commutative monoids are internal monoids	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-category-theory	76/6	Mathlib/CategoryTheory/Monoidal/Cartesian/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Mon_.lean	2	3	['YaelDillies', 'eric-wieser', 'github-actions']	kim-em assignee:kim-em	8-5847 8 days ago	15-68810 15 days ago	15-68844 15 days
29769	Vierkantor author:Vierkantor	CI: run a weekly linter workflow	This PR adds a workflow analogous to the nightly regression lints, that reports possible refactors using the tactic analysis framework. Those would be too noisy or take too much time to run in regular CI. As a first linter, we have the `mergeWithGrind` linter that reports when a sequence of tactics followed by `grind` can become just `grind`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	102/1	.github/workflows/weekly-lints.yml,Mathlib/Init.lean	2	1	['github-actions']	bryangingechen assignee:bryangingechen	8-5846 8 days ago	15-56755 15 days ago	15-56733 15 days
29771	Vierkantor author:Vierkantor	refactor(TacticAnalysis): use full CommandElabM context in test	Running the `rwMerge` linter on the whole of Mathlib reveals that the tactic analysis framework did not always correctly pass the environment to the test step of a pass. By running the test in a full `CommandElabM` and adding a `ContextInfo` and `TacticInfo`, we can access the right environment (using the `ctxI.runTacticCode` function). There are still a few subtle issues to do with notation but I would like to get this fix in first, since it involves some larger refactors. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	44/17	Mathlib/Tactic/TacticAnalysis.lean,Mathlib/Tactic/TacticAnalysis/Declarations.lean,MathlibTest/TacticAnalysis.lean	3	7	['adomani', 'bryangingechen', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	kim-em assignee:kim-em	8-5845 8 days ago	15-39771 15 days ago	15-56300 15 days
29990	pechersky author:pechersky	feat(Algebra/Subgroup/Lattice): `mem_biSup_of_directedOn`	Generalization of existing `mem_iSup_of_directed` On the way to characterization of the torsion subgroup as the sup over all subgroups of roots of unity --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra label:t-algebra$	35/10	Mathlib/Algebra/Group/Subgroup/Lattice.lean	1	1	['github-actions']	nobody	7-78132 7 days ago	7-78186 7 days ago	7-78173 7 days
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	28/21	Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean	3	6	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	7-72134 7 days ago	7-72159 7 days ago	24-1696 24 days
29464	harahu author:harahu	doc(AkraBazzi): corrections to docs by way of LLM	Changes are due to Junie Pro and Codex, both ChatGPT-based agents, hence warrants somewhat careful review. I've tried to review these changes myself, but my limited lean experience is felt as a limiting factor. Changes include: - Fixing typos, spelling and grammar - Changing some docstring code to LaTex math, where that seemed to be the intention - Move some descriptions between files, in cases where definitions were promised in files they weren't defined - Fix inconsistencies between docstrings and code (these need special review attention) [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.23.2029464.20corrections.20to.20docs.20by.20way.20of.20LLM/with/538427193) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability awaiting-author	66/60	Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean	3	26	['chrisflav', 'github-actions', 'grunweg', 'harahu', 'mathlib4-merge-conflict-bot']	nobody	7-71836 7 days ago	7-71865 7 days ago	0-6688 1 hour
28728	or4nge19 author:or4nge19	feat(PerronFrobenius): introduce Irreducible and Primitive Matrices and relations to Quiver	This PR develops a graph-theoretic interface for studying nonnegative square matrices over `ℝ` through the quiver formed by their strictly positive entries. It shows the equivalence between positivity of suitable matrix powers and existence of directed paths in this quiver. ------------ - [ ] depends on: #28696 - [ ] depends on:#29754 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-author	289/0	Mathlib.lean,Mathlib/Combinatorics/Quiver/Path/StronglyConnected.lean,Mathlib/LinearAlgebra/Matrix/Irreducible/Defs.lean	3	6	['github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'or4nge19']	nobody	7-62867 7 days ago	20-27827 20 days ago	0-32474 9 hours
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 awaiting-author label:t-algebra$	54/2	Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	2	8	['github-actions', 'pechersky', 'smmercuri']	dagurtomas assignee:dagurtomas	7-62404 7 days ago	7-78638 7 days ago	44-43929 44 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	2	['github-actions', 'joelriou']	joneugster assignee:joneugster	7-62287 7 days ago	22-53028 22 days ago	22-53004 22 days
29995	vihdzp author:vihdzp	feat: more lemmas on `Concept`	These are used in the [`combinatorial-games`](https://github.com/vihdzp/combinatorial-games) repository. Note that `Concept α α (· ≤ ·)` is the Dedekind-McNeille completion, while `Concept α α (· < ·)` is a modified form of it that's used to define surreal cuts. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	40/0	Mathlib/Order/Concept.lean	1	10	['github-actions', 'linesthatinterlace', 'vihdzp']	nobody	7-61495 7 days ago	7-66432 7 days ago	7-66467 7 days
28944	linesthatinterlace author:linesthatinterlace	refactor(Order/Hom/Basic): reorder definitions	Reorder and disentangle definitions for OrderHom, OrderEmbedding and OrderIso. --- This is a preamble to making all of these `def` and consistently defined - the aim is to first disentangle the definitions as it will make it more straightforward to perform these later PRs. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	216/184	Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/Order.lean	2	9	['YaelDillies', 'github-actions', 'linesthatinterlace', 'mathlib4-merge-conflict-bot']	YaelDillies, b-mehta, linesthatinterlace assignee:YaelDillies assignee:b-mehta assignee:linesthatinterlace	7-42449 7 days ago	9-40188 9 days ago	24-68186 24 days
29687	vihdzp author:vihdzp	feat: standard part of ratio in non-Archimedean field	We define `ArchimedeanClass.standardPart x` as the unique real number with an infinitesimal difference from `x`. This generalizes `Hyperreal.st` for a general (non-)archimedean field. --- - [x] #29611 - [x] #29685 - [ ] #29735 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		457/1	Mathlib.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Ring/Archimedean.lean,Mathlib/Data/Real/CompleteField.lean,Mathlib/Data/Real/StandardPart.lean,Mathlib/Order/Quotient.lean	6	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	7-39048 7 days ago	7-39071 7 days ago	0-0 0 seconds
23920	YaelDillies author:YaelDillies	feat: relation-separated sets	Define a notion of separation of a set relative to a relation. This will be used to unify metric and dynamical separation. From MiscYD and LeanAPAP --- - [x] depends on: #26988 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	66/0	Mathlib.lean,Mathlib/Data/Rel/Separated.lean	2	21	['ADedecker', 'D-Thomine', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	ADedecker assignee:ADedecker	7-37543 7 days ago	7-37565 7 days ago	38-15093 38 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$	527/484	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/GelfandFormula.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/UnitizationL1.lean,Mathlib/Analysis/Normed/Lp/LpEquiv.lean,Mathlib/Analysis/Normed/Module/Basic.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/NumberTheory/NumberField/Discriminant/Defs.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	96	25	['fpvandoorn', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot', 'themathqueen']	joelriou assignee:joelriou	7-33629 7 days ago	7-36250 7 days ago	21-7625 21 days
26338	mans0954 author:mans0954	feat(Order/ScottContinuity): Scott continuity on product spaces	Some further results on Scott Continuity: - `scottContinuous_iff_map_sSup`: `f` is Scott continuous if and only if it commutes with `sSup` on directed sets - `ScottContinuous_prod_of_ScottContinuous`: `f` is Scott continuous on a product space if it is Scott continuous in each variable - `ScottContinuousOn.inf₂`: For complete linear orders, the meet operation is Scott continuous --- - [x] depends on: #13201 - I think this is due to the move of the definition of Scott Continuity into its own file rather than a hard dependency. - [x] depends on: #19150 - [x] depends on: #19222 - [x] depends on:#20254 - [x] depends on: #21493 Original PR: https://github.com/leanprover-community/mathlib4/pull/15412 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	132/4	Mathlib.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/ScottContinuity.lean,Mathlib/Order/ScottContinuity/Complete.lean,Mathlib/Order/ScottContinuity/Prod.lean	5	n/a	['YaelDillies', 'github-actions', 'mans0954', 'mathlib4-dependent-issues-bot']	nobody	7-26185 7 days ago	unknown	unknown
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`	awaiting-author	191/0	Mathlib/Analysis/InnerProductSpace/Orthogonal.lean	1	7	['github-actions', 'mathlib4-dependent-issues-bot', 'sgouezel', 'yoh-tanimoto']	sgouezel assignee:sgouezel	7-25844 7 days ago	8-47952 8 days ago	12-74361 12 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/)	awaiting-zulip maintainer-merge new-contributor	158/0	Counterexamples.lean,Counterexamples/EulerSumOfPowers.lean	2	43	['MichaelStollBayreuth', 'NotWearingPants', 'eric-wieser', 'github-actions', 'tb65536', 'urkud']	MichaelStollBayreuth assignee:MichaelStollBayreuth	7-24820 7 days ago	7-24876 7 days ago	24-25032 24 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']	b-mehta assignee:b-mehta	7-5861 7 days ago	19-81261 19 days ago	19-84485 19 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']	b-mehta assignee:b-mehta	7-5860 7 days ago	30-24280 1 month ago	30-24300 30 days
29823	themathqueen author:themathqueen	feat(Algebra/Group/Submonoid): add `(Add)Submonoid.closure_pi`	This generalizes and moves some proofs from subgroups to submonoids in order to add `(Add)Submonoid.closure_pi`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	86/45	Mathlib.lean,Mathlib/Algebra/Group/Subgroup/Finite.lean,Mathlib/Algebra/Group/Submonoid/Finite.lean	3	6	['eric-wieser', 'github-actions', 'themathqueen']	dagurtomas assignee:dagurtomas	7-5854 7 days ago	14-16258 14 days ago	14-16299 14 days
29996	vihdzp author:vihdzp	chore(Order/Concept): `IsIntent` and `IsExtent`	We define predicates for a set to be an intent/extent, and use them to define alternate constructors for a concept. Using these, we golf the complete lattice instances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	161/95	Mathlib/Order/Concept.lean	1	17	['github-actions', 'linesthatinterlace', 'plp127', 'vihdzp']	nobody	6-80900 6 days ago	7-66362 7 days ago	7-66396 7 days
26138	xroblot author:xroblot	Development branch (2)	---	WIP	0/0	Mathlib/Sandbox.lean	1	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	6-67216 6 days ago	unknown	unknown
30026	ADedecker author:ADedecker	chore: new file for constructions of uniform groups	The split between `Defs` and `Basic` was a bit messy (e.g the `Prod` instance was in `Defs` but the `Pi` instance was in `Basic`), and I'm going to make these files longer when introducing left and right uniform groups, so I figured the best solution was to move everything in an intermediate `Constructions` file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	112/94	Mathlib.lean,Mathlib/Analysis/CStarAlgebra/Module/Synonym.lean,Mathlib/RingTheory/MvPowerSeries/PiTopology.lean,Mathlib/Topology/Algebra/IsUniformGroup/Basic.lean,Mathlib/Topology/Algebra/IsUniformGroup/Constructions.lean,Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean,Mathlib/Topology/Instances/TrivSqZeroExt.lean,Mathlib/Topology/UniformSpace/Matrix.lean	8	1	['github-actions']	nobody	6-46709 6 days ago	6-46709 6 days ago	6-46687 6 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` stopped updating environment extensions since [lean4#6325](https://github.com/leanprover/lean4/pull/6325), and that is exactly what we use to store linter sets. At the time of writing, `importModules` might be a suitable replacement (but this is not very safe, and not documented to be stable). Instead, write a small elaborator returning the environment at the point of elaboration, and use that instead. --- - [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/)	maintainer-merge t-meta	28/12	scripts/lint-style.lean	1	13	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	6-46504 6 days ago	6-59821 6 days ago	15-46221 15 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/)	awaiting-zulip t-analysis awaiting-author	580/9	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	42	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel', 'urkud']	j-loreaux assignee:j-loreaux	6-29401 6 days ago	6-29401 6 days ago	17-56980 17 days
30032	riccardobrasca author:riccardobrasca	feat: factorization of cyclotomic polynomial over finite fields	We compute the degree of the factors of the `n`-th cyclotomic polynomial over a finite field of characteristic `p` when `p` and `n` are coprime. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory label:t-algebra$	184/3	Mathlib.lean,Mathlib/Algebra/CharP/CharAndCard.lean,Mathlib/NumberTheory/GaussSum.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Factorization.lean	5	1	['github-actions']	nobody	6-21836 6 days ago	6-21843 6 days ago	6-37754 6 days
30038	JovanGerb author:JovanGerb	feat(push): `@[push]` annotations for `fun`	This PR adds the annotations for the tactics `push fun _ ↦ _` and `pull fun _ ↦ _` and the simprocs `pushFun` and `pullFun`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		28/6	Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Data/Nat/Cast/Basic.lean,Mathlib/Order/Lattice.lean,MathlibTest/push.lean	4	1	['github-actions']	nobody	6-9803 6 days ago	6-9871 6 days ago	6-9848 6 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']	chrisflav assignee:chrisflav	6-5840 6 days ago	19-47950 19 days ago	19-47934 19 days
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']	chrisflav assignee:chrisflav	6-5839 6 days ago	17-46460 17 days ago	18-5961 18 days
29791	llllvvuu author:llllvvuu	feat(Order): lemmas about `iSupIndep`	* generalize `Finset.SupIndep` "bind" operations from `DistribLattice` to `IsModularLattice` * new lemma `iSupIndep.iInf` * more characterizations of `iSupIndep` on submodules: * `iSupIndep_iff_finset_sum_eq_zero_imp_eq_zero` * `iSupIndep_iff_finset_sum_eq_imp_eq` * add `@[simp]` and `@[grind]` attributes which were helpful for these proofs Original motivation was to have the following fact: ```lean theorem iSupIndep_iInf_genEigenspace [NoZeroSMulDivisors R M] {α : Type*} (f : α → End R M) (k : ℕ∞) : iSupIndep fun μ : α → R ↦ ⨅ a : α, ((f a).genEigenspace (μ a)) k := .iInf (f · \|>.genEigenspace · k) (f · \|>.independent_genEigenspace k) ``` Co-authored-by: Aristotle Harmonic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	166/62	Mathlib/Data/Finset/Disjoint.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Finset/Lattice/Union.lean,Mathlib/Data/Finset/Sigma.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/Logic/Embedding/Basic.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/Partition/Finpartition.lean,Mathlib/Order/SupIndep.lean	11	12	['github-actions', 'leanprover-bot', 'llllvvuu']	bryangingechen assignee:bryangingechen	6-5839 6 days ago	14-2428 14 days ago	14-26048 14 days
24019	urkud author:urkud	feat(Analysis): Poincaré lemma for 1-forms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	984/22	Mathlib.lean,Mathlib/Analysis/Calculus/Poincare/OneForm.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Convex/PathConnected.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/MeasureTheory/Integral/DivergenceTheorem.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/ContDiff.lean,Mathlib/MeasureTheory/Integral/PathIntegral/Basic.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/UnitInterval.lean	11	4	['github-actions', 'leanprover-community-bot-assistant']	nobody	6-5683 6 days ago	17-40909 17 days ago	0-0 0 seconds
10235	urkud author:urkud	feat: add `Decidable`, `Fintype`, `Encodable` linters	This PR ports the `decidableClassical`, `fintypeFinite` and `encodableCountable` linters from mathlib3: all three are environment linters which flag declarations that have a hypothesis `[Decidable p]` etc., but do not use the underlying assumption in this type. Restructuring the code can make the statement more general. The implementation is in fact quite general, and can easily adapt to include further types. PRs #17518 and #17519 are two examples of further such linters. --- Please don't fix the failures related to `HasFDerivWithinAt.pi`. Finiteness assumptions in these lemmas will be completely removed during porting to TVS. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench large-import t-linter t-meta awaiting-author	123/4	Mathlib.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/NumberTheory/JacobiSum/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Tactic.lean,Mathlib/Tactic/GeneralizeProofs.lean,Mathlib/Tactic/Linter/UnusedAssumptionInType.lean	11	n/a	['Command-Master', 'github-actions', 'grunweg', 'kmill', 'leanprover-bot', 'urkud']	nobody	6-5164 6 days ago	unknown	unknown
29512	grunweg author:grunweg	feat: check for PR titles which do not start with "feat" etc.	We ignore draft PRs and PRs with the WIP label. The set of checks is intentionally kept small, and could be expanded in the future. --- More basic version of #16303: given that mathlib's statistics will use the PR kind, let's make sure PR kinds are somewhat appropriate. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		365/0	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ValidatePRTitle.lean,lakefile.lean,scripts/README.md,scripts/check_title_labels.lean	10	17	['bryangingechen', 'eric-wieser', 'github-actions', 'grunweg']	bryangingechen assignee:bryangingechen	5-73776 5 days ago	23-36211 23 days ago	23-36187 23 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 awaiting-author label:t-algebra$	101/2	Mathlib.lean,Mathlib/RepresentationTheory/Commutative.lean,Mathlib/RepresentationTheory/FDRep.lean,docs/undergrad.yaml	4	13	['github-actions', 'riccardobrasca', 'uniwuni']	riccardobrasca assignee:riccardobrasca	5-68423 5 days ago	5-68423 5 days ago	14-46245 14 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	5-62523 5 days ago	25-15604 25 days ago	25-15643 25 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	8	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mitchell-horner', 'vihdzp']	kmill assignee:kmill	5-62521 5 days ago	5-65852 5 days ago	32-84975 32 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	5-62509 5 days ago	30-41622 1 month ago	38-85358 38 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	5-62497 5 days ago	112-46609 3 months ago	112-46585 112 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	5-62471 5 days ago	67-31845 2 months ago	67-31887 67 days
29002	grunweg author:grunweg	chore: move Data/Real/Irrational to RingTheory	It certainly has nothing to do with data (structures). --- I'm less sure where to put it instead. [zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Cleaning.20up.20.60Data.60/with/536301893) suggested this place; in the future, this could also be split. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed awaiting-zulip	10/10	Counterexamples/IrrationalPowerOfIrrational.lean,Mathlib.lean,Mathlib/Analysis/Real/Pi/Irrational.lean,Mathlib/Data/Real/GoldenRatio.lean,Mathlib/NumberTheory/DiophantineApproximation/Basic.lean,Mathlib/NumberTheory/Rayleigh.lean,Mathlib/NumberTheory/Transcendental/Liouville/Basic.lean,Mathlib/RingTheory/Real/Irrational.lean,Mathlib/Tactic/NormNum/Irrational.lean,Mathlib/Topology/Instances/AddCircle/DenseSubgroup.lean,Mathlib/Topology/Instances/Irrational.lean	11	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	5-61275 5 days ago	5-61358 5 days ago	0-67 1 minute
30042	JovanGerb author:JovanGerb	feat(push): `@[push]` attributes for `∈` in `Set`, `Finset` and `Multiset`	This PR adds `@[push]` annotations for the membership relations, for `Set`, `Finset` and `Multiset`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		169/104	Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/ListOfFn.lean,Mathlib/Algebra/Order/Group/Multiset.lean,Mathlib/Data/DFinsupp/Interval.lean,Mathlib/Data/Finmap.lean,Mathlib/Data/Finset/BooleanAlgebra.lean,Mathlib/Data/Finset/Dedup.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Disjoint.lean,Mathlib/Data/Finset/Filter.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Insert.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Finset/Pi.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Finset/Range.lean,Mathlib/Data/Finset/SDiff.lean,Mathlib/Data/Finset/Sigma.lean,Mathlib/Data/Finset/Sum.lean,Mathlib/Data/Finset/Sups.lean,Mathlib/Data/Finset/Union.lean,Mathlib/Data/Fintype/Defs.lean,Mathlib/Data/Multiset/AddSub.lean,Mathlib/Data/Multiset/Antidiagonal.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Dedup.lean,Mathlib/Data/Multiset/Defs.lean,Mathlib/Data/Multiset/Filter.lean,Mathlib/Data/Multiset/FinsetOps.lean,Mathlib/Data/Multiset/MapFold.lean,Mathlib/Data/Multiset/Pi.lean,Mathlib/Data/Multiset/Range.lean,Mathlib/Data/Multiset/Replicate.lean,Mathlib/Data/Multiset/Sort.lean,Mathlib/Data/Multiset/Sum.lean,Mathlib/Data/Multiset/UnionInter.lean,Mathlib/Data/Multiset/ZeroCons.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/Interval/Multiset.lean,Mathlib/Order/Interval/Set/Defs.lean,Mathlib/Order/SetNotation.lean,MathlibTest/push.lean	48	1	['github-actions']	nobody	5-61106 5 days ago	6-6917 6 days ago	6-6894 6 days
30039	JovanGerb author:JovanGerb	feat(push): `@[push]` annotations for `Real.log`	This PR adds `push` annotations, and tests for `Real.log`. It also updates the `#push` and `#pull` commands so that they can take a discharger, and can take any head. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		45/18	Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Tactic/Push.lean,MathlibTest/push.lean	4	1	['github-actions']	nobody	5-60724 5 days ago	6-9808 6 days ago	6-9785 6 days
28052	EtienneC30 author:EtienneC30	feat: positive semidefinite sesquilinear forms	Define positive semidefinite sesquilinear forms and prove that a `SesquilinForm R M` is positive semidefinite if and only if the corresponding matrix is positive semidefinite. --- - [x] depends on: #27873 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	226/0	Mathlib.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean,Mathlib/LinearAlgebra/SesquilinearForm/IsPosSemidef.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-49805 5 days ago	5-50493 5 days ago	0-0 0 seconds
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$	88/5	Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/LinearAlgebra/Matrix/Kronecker.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean	4	9	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen']	joneugster assignee:joneugster	5-47453 5 days ago	8-54175 8 days ago	32-18723 32 days
29315	unknown author:unknown	chore: raise priority of `IsTopologicalSemiring.toIsModuleTopology`	unknown description	t-topology awaiting-author	-1/-1		-1	n/a	[]	nobody	5-44499 5 days ago	unknown	unknown
29789	robertmaxton42 author:robertmaxton42	feat (TopCat.Sphere) : add the open ball, instances	* Adds `𝔹 n`, the open `n`-ball, as a bundled object in `TopCat`, and accompanying notation and inclusion hom * Adds instances witnessing that both inclusions are mono and that the disk and disk-boundary are compact --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	40/3	Mathlib/Topology/Category/TopCat/Sphere.lean	1	7	['github-actions', 'ocfnash']	ocfnash assignee:ocfnash	5-43149 5 days ago	5-43149 5 days ago	9-51207 9 days
29361	FlAmmmmING author:FlAmmmmING	feat: Catalan generating function as a formal power series	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	71/0	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Catalan.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'wwylele']	kbuzzard assignee:kbuzzard	5-34539 5 days ago	28-64930 28 days ago	28-64960 28 days
27290	themathqueen author:themathqueen	feat: `Star`, `StarAddMonoid`, and `StarModule` instances for tensor products	This pr defines the `Star`, `StarAddMonoid` and `StarModule` instances on tensor product spaces. And the `StarRing` instance. --- - [x] depends on: #27288 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	55/0	Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/Star.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'themathqueen']	nobody	5-33635 5 days ago	5-36868 5 days ago	5-37682 5 days
28925	grunweg author:grunweg	chore: remove `linear_combination'` tactic	When `linear_combination` was refactored in #15899, the old code was kept as the `linear_combination'` tactic, for easier migration. The consensus of the zulip discussion ([#mathlib4 > Narrowing the scope of `linear_combination` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Narrowing.20the.20scope.20of.20.60linear_combination.60/near/470237816)) was to wait, and "revisit this once people have experienced the various tactics in practice". One year later, the old tactic has almost no uses: it is unused in mathlib; [searching on github](https://github.com/search?q=linear_combination%27%20path%3A*.lean&type=code) yields 37 hits --- all of which are in various forks of mathlib. Thus, removing this tactic seems appropriate. --- Do not merge before the zulip discussion has concluded! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed awaiting-zulip	0/564	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LinearCombination'.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,MathlibTest/linear_combination'.lean	5	3	['euprunin', 'github-actions', 'grunweg']	nobody	5-32839 5 days ago	39-18747 1 month ago	0-1 1 second
27228	themathqueen author:themathqueen	feat: defining the inner product on tensor products	This defines the inner product on tensor product spaces. Also defines `OrthonormalBasis.tensorProduct`. The implementation is based on [here](https://github.com/ocfnash/lean-shannon-lovasz/blob/e63e535599ffb3c2a7e995e1621847693dd68fab/src/to_mathlib/analysis/inner_product_space/tensor_product.lean#L404) (by @jjaassoonn), which defines the inner product on real tensor product spaces. The exact same implementation also applies for the general case. Closes #6020 --- - [x] depends on: #27288 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis label:t-algebra$	281/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/TensorProduct.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Basis.lean	4	5	['eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'themathqueen']	nobody	5-32667 5 days ago	5-32668 5 days ago	5-33967 5 days
29589	grunweg author:grunweg	feat: add mfderiv_prod and mfderiv_prodMap	Part of my bordism theory project: these will be needed for https://github.com/leanprover-community/mathlib4/pull/22059. Updated version of #22642. --- - [x] depends on: #30049 for ease of reviewing [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	81/0	Mathlib/Analysis/Calculus/FDeriv/Prod.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	5-29624 5 days ago	5-51255 5 days ago	5-51261 5 days
30009	ADedecker author:ADedecker	chore: rename `IsTopologicalGroup.toUniformSpace` to `IsTopologicalGroup.rightUniformSpace`	I have plans to finally do left and right uniformities properly, but I'd like to do some of the remaining before the fact to ease review. I also take this opportunity to remove a duplication of private lemmas `extend_Z_bilin_aux` and `extend_Z_bilin_key`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	104/184	Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/LocallyConvex/Bounded.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Group/Quotient.lean,Mathlib/Analysis/Normed/Operator/Compact.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Bernstein.lean,Mathlib/Topology/Algebra/Group/Defs.lean,Mathlib/Topology/Algebra/InfiniteSum/Group.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean,Mathlib/Topology/Algebra/IsUniformGroup/Basic.lean,Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/Algebra/Module/Multilinear/Topology.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Nonarchimedean/AdicTopology.lean,Mathlib/Topology/Algebra/UniformFilterBasis.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean,Mathlib/Topology/ContinuousMap/Algebra.lean	23	3	['github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	nobody	5-28623 5 days ago	5-28645 5 days ago	6-42051 6 days
30056	vlad902 author:vlad902	feat(GroupTheory): finitely generated groups are quotients of free groups on finite generators	This is equivalent to the formulation that finitely generated groups/monoids are quotients of FreeGroups/Monoids over the same generators, though I think the phrasing as a surjective homomorphism is more useful. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	31/0	Mathlib/GroupTheory/Finiteness.lean	1	1	['github-actions']	nobody	5-27240 5 days ago	5-27256 5 days ago	5-27289 5 days
29362	stepanholub author:stepanholub	feat:(Data/List) add the notion of period of List and prove the Periodicity Lemma	Add the concept of the period of a List (word, sequence) which is missing, and prove its basic nontrivial property describing under which conditions list can have two periods known as the Periodicity Lemma (aka Fine-Wilf Theorem). ---	t-data new-contributor	227/0	Mathlib.lean,Mathlib/Data/List/PeriodicityLemma.lean	2	125	['Ruben-VandeVelde', 'Timeroot', 'fpvandoorn', 'github-actions', 'madvorak', 'plp127', 'stepanholub', 'wwylele']	nobody	5-24487 5 days ago	9-27301 9 days ago	27-23498 27 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	231/0	Mathlib.lean,Mathlib/Order/BourbakiWitt.lean,docs/1000.yaml	3	7	['eric-wieser', 'fmortimore', 'github-actions', 'wwylele']	Vierkantor assignee:Vierkantor	5-21048 5 days ago	19-17778 19 days ago	19-17809 19 days
30062	plp127 author:plp127	chore(Order/Defs/PartialOrder): golf non-instance	Golf `decidableLTOfDecidableLE` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order easy	2/6	Mathlib/Order/Defs/PartialOrder.lean	1	1	['github-actions']	nobody	5-13999 5 days ago	5-14063 5 days ago	5-14052 5 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']	awainverse assignee:awainverse	5-5853 5 days ago	28-31330 28 days ago	28-31373 28 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']	awainverse assignee:awainverse	5-5852 5 days ago	27-69952 27 days ago	27-69986 27 days
29758	NotWearingPants author:NotWearingPants	feat(RingTheory/RootsOfUnity): exp(pi * i * q) is a root of unity for rational q	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	32/1	Mathlib/RingTheory/RootsOfUnity/Complex.lean	1	5	['NotWearingPants', 'Ruben-VandeVelde', 'github-actions', 'kckennylau']	chrisflav assignee:chrisflav	5-5851 5 days ago	15-10667 15 days ago	15-17667 15 days
29864	themathqueen author:themathqueen	chore(Algebra/Order/BigOperators/Group/{Finset, Multiset}): generalize results to `(Mul)(Add)LeftMono`	Generalize some stuff from `IsOrdered(Add)Monoid` to `(Mul)(Add)LeftMono`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	61/53	Mathlib/Algebra/Order/BigOperators/Group/Finset.lean,Mathlib/Algebra/Order/BigOperators/Group/Multiset.lean,Mathlib/Algebra/Order/Group/Int/Sum.lean,Mathlib/Data/NNRat/BigOperators.lean,Mathlib/Tactic/Positivity/Finset.lean	5	1	['github-actions']	dagurtomas assignee:dagurtomas	5-5847 5 days ago	12-26887 12 days ago	12-34106 12 days
30041	josephmckinsey author:josephmckinsey	feat(Algebra/Order/Floor): generalize mul_floor_div theorems to rings and semirings	Generalize `mul_cast_floor_div_cancel` from `Field` and `Semifield` to `Ring` and `Semiring`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	43/31	Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semifield.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Analysis/Real/OfDigits.lean	4	9	['Ruben-VandeVelde', 'github-actions', 'josephmckinsey']	nobody	5-3176 5 days ago	5-59146 5 days ago	0-35025 9 hours
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	4-66791 4 days ago	35-5518 1 month ago	35-5551 35 days
29501	Vierkantor author:Vierkantor	test(TacticAnalysis): ensure `classical`'s effects are picked up	This test case used to fail, and needed a fix to the `classical` tactic in the standard library: - [x] depends on: https://github.com/leanprover/lean4/pull/10332 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-meta	10/0	MathlibTest/TacticAnalysis.lean	1	6	['Vierkantor', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-65172 4 days ago	6-57649 6 days ago	8-64542 8 days
29946	smmercuri author:smmercuri	feat(InfinitePlace/Ramification): embeddings of unramified/ramified infinite places satisfy `IsUnmixed/IsMixed`	--- - [x] depends on: #29945 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-number-theory	52/1	Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-57747 4 days ago	4-57769 4 days ago	4-67849 4 days
29309	LLaurance author:LLaurance	feat(Combinatorics/SimpleGraph): Nontrivial connected graph contains a vertex that leaves the graph connected if removed	This shows that any nontrivial connected graph contains a vertex that, when removed, leaves the graph connected. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-combinatorics	156/10	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean	5	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	4-54205 4 days ago	4-54205 4 days ago	25-58822 25 days
29735	vihdzp author:vihdzp	feat: order instances on quotients	We define a `Preorder (Quotient s)` instance in the natural way, and prove that it can be strengthened to a `LinearOrder` when all equivalence classes are `OrdConnected`. --- See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Quotient.20of.20linear.20order.20is.20linear.20order/near/539915988) for some long-winded discussion about this. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	125/0	Mathlib.lean,Mathlib/Order/Quotient.lean	2	3	['github-actions', 'plp127']	bryangingechen assignee:bryangingechen	4-49046 4 days ago	16-76495 16 days ago	16-76529 16 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 RFC delegated	2/1	Mathlib/Algebra/Order/Ring/Defs.lean	1	32	['Vierkantor', 'YaelDillies', 'alreadydone', 'artie2000', 'erdOne', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib-bors']	erdOne assignee:erdOne	4-45558 4 days ago	4-45558 4 days ago	45-49533 45 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	t-algebra label:t-algebra$	121/12	Mathlib/NumberTheory/Cyclotomic/Basic.lean	1	8	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'ocfnash', 'xroblot']	ocfnash assignee:ocfnash	4-42186 4 days ago	4-42308 4 days ago	17-12284 17 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	58/68	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	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	4-38539 4 days ago	4-45047 4 days ago	12-55416 12 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 maintainer-merge	247/20	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	24	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier']	robin-carlier assignee:robin-carlier	4-37500 4 days ago	4-42846 4 days ago	23-14278 23 days
29425	pechersky author:pechersky	feat(NumberTheory/Padics/Torsion): `HasEnoughRootsOfUnity ℤ_[p] (p - 1)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #29403 - [x] depends on: #29404 - [x] depends on: #29405 - [x] depends on: #29408 - [x] depends on: #29424	t-ring-theory	179/0	Mathlib.lean,Mathlib/NumberTheory/Padics/Torsion.lean,Mathlib/RingTheory/ZMod/Torsion.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-36447 4 days ago	4-37123 4 days ago	4-37756 4 days
26104	xroblot author:xroblot	feat(NumberField/IsCM): compute ratio of regulators	This PR continues the work from #23696. Compute the ratio between the regulator of `K` and the regulator of its maximal real subfield. --- - [x] depends on: #23694 - [x] depends on: #26075 - [x] depends on: #26108	t-number-theory	75/4	Mathlib/GroupTheory/Index.lean,Mathlib/NumberTheory/NumberField/CMField.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/TotallyRealComplex.lean,Mathlib/NumberTheory/NumberField/Units/Regulator.lean	4	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'xroblot']	nobody	4-36114 4 days ago	4-38006 4 days ago	4-39389 4 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']	robin-carlier assignee:robin-carlier	4-35910 4 days ago	4-35910 4 days ago	18-30374 18 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	225/4	Mathlib.lean,Mathlib/CategoryTheory/Localization/Monoidal/Basic.lean,Mathlib/CategoryTheory/Localization/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Braided/Multifunctor.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean	6	15	['dagurtomas', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	mattrobball assignee:mattrobball	4-35285 4 days ago	4-36156 4 days ago	60-45306 60 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/)	t-algebra label:t-algebra$	51/13	Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Order/AddTorsor.lean	2	5	['ScottCarnahan', 'dagurtomas', 'github-actions']	dagurtomas assignee:dagurtomas	4-34475 4 days ago	4-34503 4 days ago	38-47327 38 days
30037	linesthatinterlace author:linesthatinterlace	feat: Fin.find update	We currently define `Fin.find` in a way that is redundant (in the sense that it is just equivalent to `Fin.find?` in batteries). This PR replaces it with a definition that works closer to `Nat.find`, and links the new definition of `Fin.find` to `Fin.find?` in the natural way. --- - [ ] depends on: batteries#1431 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		137/103	Mathlib/Data/Fin/Tuple/Basic.lean,lake-manifest.json	2	6	['github-actions', 'linesthatinterlace', 'llllvvuu', 'mathlib4-merge-conflict-bot']	nobody	4-33080 4 days ago	4-33098 4 days ago	6-2604 6 days
28224	joelriou author:joelriou	feat(AlgebraicTopology): the type of non degenerate simplices of a simplicial set	In this PR, we introduce the ordered type `X.N` of nondegenerate simplices in a simplicial set `X`. --- - [x] depends on: #27968 - [x] depends on: #28034 - [x] depends on: #26076 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology	217/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/CategoryTheory/EpiMono.lean	5	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-29981 4 days ago	4-29994 4 days ago	4-29971 4 days
26985	agjftucker author:agjftucker	feat(Analysis/Calculus/Implicit): define implicitFunOfProdDomain	This PR continues the work from #16743. Original PR: https://github.com/leanprover-community/mathlib4/pull/16743 --- - [x] depends on: #28352 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	107/4	Mathlib/Analysis/Calculus/Implicit.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-29341 4 days ago	4-66346 4 days ago	4-67925 4 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	15	['MichaelStollBayreuth', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-27771 4 days ago	16-54193 16 days ago	16-55790 16 days
29860	mcdoll author:mcdoll	feat(Analysis/Fourier): Parseval identity	The Plancherel theorem states that the Fourier transform is unitary on L^2. We prove the main step which is that the Fourier transform on Schwartz space preserves the L^2-norm. --- The extension of the Fourier transform to L^2 will be proved in a subsequent PR. - [x] depends on: #29852 - [x] depends on: #29853 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	144/26	Mathlib/Analysis/Distribution/FourierSchwartz.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Fourier/FourierTransform.lean,docs/undergrad.yaml	4	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-15495 4 days ago	4-15514 4 days ago	10-18519 10 days
27258	JovanGerb author:JovanGerb	Imo2020 q6	Original PR: #23431 This PR adds a solution to IMO 2020 Q6. It follows the solution that I found when I was participating in the IMO. I used the statement formalization that was given by @jsm28. TODO: The function `project a b p` that is defined here should be replaced with `signedDist a p (b -ᵥ a)`. --- - [x] depends on: #27257 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO	346/0	Archive.lean,Archive/Imo/Imo2020Q6.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	dwrensha assignee:dwrensha	4-5853 4 days ago	11-37940 11 days ago	11-39221 11 days
27416	joelriou author:joelriou	feat(Algebra/Homology): Ext modules	In this PR, we show that if `C` is a `R`-linear abelian category, then there is a `R`-module structure on the groups `Ext X Y n` for `X` and `Y` in `C` and `n : ℕ`. --- - [x] depends on: #26031 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra t-category-theory label:t-algebra$	164/12	Mathlib.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean	5	6	['Thmoas-Guan', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	dagurtomas assignee:dagurtomas	4-5852 4 days ago	11-37953 11 days ago	11-38073 11 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']	pechersky assignee:pechersky	4-5850 4 days ago	64-56268 2 months ago	64-56306 64 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']	pechersky assignee:pechersky	4-5849 4 days ago	62-40578 2 months ago	63-7710 63 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']	pechersky assignee:pechersky	4-5848 4 days ago	59-5435 1 month ago	59-33481 59 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']	pechersky assignee:pechersky	4-5847 4 days ago	57-58325 1 month ago	57-58365 57 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']	pechersky assignee:pechersky	4-5846 4 days ago	56-45050 1 month ago	56-45485 56 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']	alreadydone assignee:alreadydone	4-5844 4 days ago	29-11912 29 days ago	29-31099 29 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']	YaelDillies assignee:YaelDillies	4-5843 4 days ago	28-52542 28 days ago	28-52577 28 days
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$	187/268	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	4	['github-actions', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	4-5842 4 days ago	11-67471 11 days ago	21-30083 21 days
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$	128/27	Mathlib.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Eigenspace/Charpoly.lean,Mathlib/LinearAlgebra/Eigenspace/Matrix.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Eigs.lean	5	15	['github-actions', 'llllvvuu', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen']	ocfnash assignee:ocfnash	4-5841 4 days ago	11-12904 11 days ago	21-9689 21 days
29861	themathqueen author:themathqueen	feat(LinearAlgebra/Matrix/PosDef): `vecMulVec a (star a)` is positive semi-definite	The matrices `vecMulVec a (star a)` and `vecMulVec (star a) a` are always positive semi-definite. And in a nontrivial commutative ring with nontrivial index, they are never positive definite. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	64/0	Mathlib/Data/Matrix/Mul.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean	2	7	['eric-wieser', 'github-actions', 'themathqueen']	ocfnash assignee:ocfnash	4-5838 4 days ago	11-49946 11 days ago	12-37783 12 days
29877	Komyyy author:Komyyy	feat: inner product of the gradient	Also, this PR enables the `conj` notation in the file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	37/10	Mathlib/Analysis/Calculus/Gradient/Basic.lean	1	1	['github-actions']	hrmacbeth assignee:hrmacbeth	4-5837 4 days ago	11-51101 11 days ago	11-51080 11 days
29888	mcdoll author:mcdoll	feat(Analysis/Normed): Extend densely defined LinearMaps to CLM	This PR both adds a new and more user-friendly way to extend a CLM defined on a dense subspace. It also moves the old definition to the same file and as a side effect, we reduce the import tree. The moved parts are not modified except for adapting the sections and imports. Original definition of `ContinuousLinearMap.extend` was by Zhouhang Zhou in 2019 (mathlib3 PR #1649) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	254/86	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/Normed/Operator/Completeness.lean,Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean	5	2	['github-actions', 'mcdoll']	hrmacbeth assignee:hrmacbeth	4-5836 4 days ago	11-18304 11 days ago	11-36055 11 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 awaiting-author	7/4	Mathlib/Data/Finsupp/Pointwise.lean	1	8	['Paul-Lez', 'eric-wieser', 'github-actions', 'kckennylau', 'pechersky']	pechersky assignee:pechersky	4-2694 4 days ago	4-2933 4 days ago	168-19511 168 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 awaiting-author label:t-algebra$	137/16	Mathlib/Data/DFinsupp/Defs.lean,Mathlib/LinearAlgebra/DFinsupp.lean	2	12	['github-actions', 'mathlib4-dependent-issues-bot', 'pechersky']	pechersky assignee:pechersky	4-1967 4 days ago	4-1967 4 days ago	19-26510 19 days
26330	Timeroot author:Timeroot	feat: "Junk value" test file	This PR continues the work from #25173. Original PR: https://github.com/leanprover-community/mathlib4/pull/25173	t-data awaiting-author	360/0	MathlibTest/Junk.lean	1	17	['NotWearingPants', 'Timeroot', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak', 'pechersky', 'vihdzp']	pechersky assignee:pechersky	4-1184 4 days ago	4-1184 4 days ago	96-70055 96 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 awaiting-author	2/3	Mathlib/Data/ZMod/Defs.lean	1	2	['github-actions', 'jcommelin']	pechersky assignee:pechersky	4-403 4 days ago	4-403 4 days ago	46-561 46 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/)		332/331	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/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	73	5	['euprunin', 'github-actions', 'mathlib4-merge-conflict-bot']	dwrensha assignee:dwrensha	3-54374 3 days ago	18-60588 18 days ago	29-61732 29 days
30073	JovanGerb author:JovanGerb	feat: new `by_cases!` tactic	This PR defines the `by_cases! h : p` tactic, which is a macro for `by_cases h : p` followed by a `try push_neg at h` in the second goal. We use `try push_neg` instead of `push_neg` to make the tactic also succeed when no negation is pushed. Should this maybe throw an warning? This PR also refactors many proofs to use `by_cases!` The tactic implementation can be found in the first commit. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	574/717	Archive/Imo/Imo2024Q6.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Mathlib.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/Category/Grp/Adjunctions.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/GCDMonoid/Multiset.lean,Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Homology/Embedding/TruncGE.lean,Mathlib/Algebra/Homology/HomotopyCofiber.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Algebra/Polynomial/Degree/TrailingDegree.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/OfFn.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/AlgebraicTopology/DoldKan/Decomposition.lean,Mathlib/AlgebraicTopology/DoldKan/Faces.lean,Mathlib/AlgebraicTopology/DoldKan/Projections.lean,Mathlib/AlgebraicTopology/SimplicialObject/II.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unique.lean,Mathlib/Analysis/CStarAlgebra/Unitization.lean,Mathlib/Analysis/Calculus/FDeriv/Extend.lean,Mathlib/Analysis/Calculus/FDeriv/Norm.lean,Mathlib/Analysis/Calculus/LocalExtr/Rolle.lean,Mathlib/Analysis/Calculus/SmoothSeries.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Analysis/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Convex/EGauge.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Hofer.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/Meromorphic/NormalForm.lean,Mathlib/Analysis/Normed/Group/Ultra.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Unbundled/RingSeminorm.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromBounded.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Analysis/Polynomial/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/Log.lean,Mathlib/Analysis/SpecialFunctions/Log/PosLog.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Complex.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Analysis/SumOverResidueClass.lean,Mathlib/CategoryTheory/Limits/Shapes/Preorder/WellOrderContinuous.lean,Mathlib/Combinatorics/Additive/RuzsaCovering.lean,Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Combinatorics/HalesJewett.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/Matroid/IndepAxioms.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/Combinatorics/SetFamily/Intersecting.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Equitabilise.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Control/LawfulFix.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/Int/Order/Basic.lean,Mathlib/Data/List/Intervals.lean,Mathlib/Data/Nat/Choose/Factorization.lean,Mathlib/Data/Nat/Digits/Lemmas.lean,Mathlib/Data/Nat/Nth.lean,Mathlib/Data/Real/Embedding.lean,Mathlib/Data/Set/Card/Arithmetic.lean,Mathlib/Data/Set/Equitable.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/FieldTheory/JacobsonNoether.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/Basic.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Geometry/Manifold/IntegralCurve/UniformTime.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/LinearAlgebra/Basis/Defs.lean	203	2	['JovanGerb', 'github-actions']	nobody	3-53929 3 days ago	4-34683 4 days ago	4-34725 4 days
29257	harahu author:harahu	doc: attach "pre", "pseudo", "semi" and "sub" as a prefixes where they are now free-standing	These are all examples of [bound morphemes](https://en.wikipedia.org/wiki/Bound_and_free_morphemes) and should be attached, either in closed form or by hyphen, to some other construct. Whether to write the resulting words with a hyphen or in closed form is a stylistic choice and I am open to discussing the specifics. I've made choices based on existing literature and what I personally found natural. --- [![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	3-53109 3 days ago	31-28211 1 month ago	31-28249 31 days
30022	ADedecker author:ADedecker	feat: theory of `IsRightUniformGroup` and `IsLeftUniformGroup`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	1003/367	Mathlib/Topology/Algebra/IsUniformGroup/Basic.lean,Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	3-52200 3 days ago	5-28230 5 days ago	0-0 0 seconds
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/) - [x] depends on: #29917	t-meta delegated	219/7	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Field.lean,Mathlib/Tactic/FieldSimp.lean,MathlibTest/FieldSimp.lean	5	47	['Vierkantor', 'adomani', 'fpvandoorn', 'github-actions', 'grunweg', 'hrmacbeth', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	grunweg assignee:grunweg	3-50607 3 days ago	3-51802 3 days ago	28-66972 28 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	462/3	Mathlib.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/OrderOfVanishing/Basic.lean,Mathlib/RingTheory/OrderOfVanishing/Properties.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	erdOne assignee:erdOne	3-42954 3 days ago	3-42981 3 days ago	19-55363 19 days
19668	YaelDillies author:YaelDillies	refactor: define `≤`/`<` on `WithBot`/`WithTop` by induction	The motivation for this change is that it is really confusing to run `intro r s shouldnthaveintroedthat` on a goal of the form `∀ r s : ℝ≥0∞, r ≤ s` and get the nonsense-looking goal `r = ↑shouldnthaveintroedthat → ∃ b : α, s = ↑b ∧ shouldnthaveintroedthat ≤ b⟩` instead of an error, and similarly when destructing something of the form `∃ r s : ℝ≥0∞, r < s`. Furthermore, I suspect this improves performance. --- - [x] depends on: #20317 - [x] depends on: #20318 - [x] depends on: #21274 - [x] depends on: #22109 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	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	29	['JovanGerb', 'Vierkantor', '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	3-39940 3 days ago	18-20686 18 days ago	188-78287 188 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	291/0	Mathlib.lean,Mathlib/Topology/Convenient/GeneratedBy.lean,docs/references.bib	3	10	['github-actions', 'joelriou', 'peabrainiac']	jcommelin assignee:jcommelin	3-35435 3 days ago	29-61503 29 days ago	29-61479 29 days
29837	jsm28 author:jsm28	feat(Geometry/Euclidean/Incenter): touchpoints in `interior` and `Sbtw`	Add lemmas showing that touchpoints for the incenter are in the interior of a face, as is the touchpoint opposite a vertex for the excenter opposite that vertex, and corresponding `Sbtw` statements in the case of a triangle including `Sbtw` statements about the other touchpoints (not in the interior of a side) for an excenter in that case. The `Sbtw` statements are expected to be used in followups together with #29656 to give statements about the incenter and excenters lying on angle bisectors as expressed in terms of angles involving vertices rather than touchpoints. --- - [ ] depends on: #29410 - [ ] depends on: #29418 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	102/1	Mathlib/Geometry/Euclidean/Incenter.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-34732 3 days ago	3-36054 3 days ago	3-37224 3 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 awaiting-author label:t-algebra$	28/0	Mathlib/Algebra/Ring/Invertible.lean	1	10	['eric-wieser', 'github-actions', 'izanbf1803', 'ocfnash']	ocfnash assignee:ocfnash	3-29525 3 days ago	5-40124 5 days ago	18-75864 18 days
30089	loefflerd author:loefflerd	feat(NumberTheory/ModularForms): WIP on widths of cusps	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory WIP	458/17	Mathlib.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Data/Set/Constructions.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/FinTwo.lean,Mathlib/NumberTheory/ModularForms/ArithmeticSubgroups.lean,Mathlib/NumberTheory/ModularForms/Cusps.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Algebra/IsUniformGroup/DiscreteSubgroup.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/DiscreteSubset.lean	10	n/a	['github-actions']	nobody	3-24103 3 days ago	unknown	unknown
25822	ScottCarnahan author:ScottCarnahan	WIP: experiments with vertex algebras	This is a testbed for various attempts at things. Please don't bother reviewing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #25821. Original PR: https://github.com/leanprover-community/mathlib4/pull/25821	large-import WIP	8040/293	Mathlib.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Lie/Abelian.lean,Mathlib/Algebra/Lie/ChevalleyEilenberg.lean,Mathlib/Algebra/Lie/Cochain.lean,Mathlib/Algebra/Lie/Cocycle.lean,Mathlib/Algebra/Lie/Extension.lean,Mathlib/Algebra/Lie/Extension/CentralExtension.lean,Mathlib/Algebra/Lie/Loop.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Algebra/Order/Monoid/Prod.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/Nusmeval.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/Algebra/Vertex/Affine.lean,Mathlib/Algebra/Vertex/Basic.lean,Mathlib/Algebra/Vertex/Defs.lean,Mathlib/Algebra/Vertex/HVertexOperator.lean,Mathlib/Algebra/Vertex/VertexOperator.lean,Mathlib/Data/Finset/SMulAntidiagonal.lean,Mathlib/Data/Finsupp/PointwiseSMul.lean,Mathlib/Data/FunLike/Equiv.lean,Mathlib/Data/Prod/RevLex.lean,Mathlib/Data/Set/SMulAntidiagonal.lean,Mathlib/GroupTheory/GroupAction/Equiv.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/RingTheory/Binomial.lean,Mathlib/RingTheory/DividedPowers/Cauchy.lean,Mathlib/RingTheory/FormalSeries.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Basic.lean,Mathlib/RingTheory/HahnSeries/Binomial.lean,Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/HahnSeries/Summable.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/PowerSeries/Binomial.lean,Mathlib/RingTheory/PowerSeries/Eval.lean	41	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	3-14022 3 days ago	unknown	unknown
29207	YaelDillies author:YaelDillies	chore(MonoidAlgebra/Defs): reorder, rename variables	Sort the declarations according to typeclass assumptions, and according to the order in which we need them to be for #25273. Rename the semiring variable to `R` and the monoid one to `M`. Simultaneously golf. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	461/588	Mathlib/Algebra/Category/Ring/Adjunctions.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/MonoidAlgebra/Module.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/Polynomial/Laurent.lean	9	6	['JovanGerb', 'YaelDillies', 'github-actions']	dagurtomas assignee:dagurtomas	3-5835 3 days ago	10-35181 10 days ago	10-35164 10 days
29729	Ruben-VandeVelde author:Ruben-VandeVelde	feat: Ideal.ramificationIdx_mul_inertiaDeg_of_isLocalRing	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-number-theory	27/0	Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/RingTheory/DedekindDomain/Basic.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean	3	8	['Ruben-VandeVelde', 'github-actions', 'mathlib4-merge-conflict-bot', 'tb65536', 'xroblot']	MichaelStollBayreuth assignee:MichaelStollBayreuth	3-5834 3 days ago	10-69304 10 days ago	16-63234 16 days
29772	ScottCarnahan author:ScottCarnahan	feat (RingTheory/HahnSeries/Multiplication): Add group instances to HahnModule	This PR adds `Zero` and `AddCommGroup` instances to `HahnModule` when appropriate. We also add comparison lemmas for subtraction in the `AddCommGroup` case, and reorganize some `variables`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	18/9	Mathlib/RingTheory/HahnSeries/Multiplication.lean	1	1	['github-actions']	erdOne assignee:erdOne	3-5833 3 days ago	15-54019 15 days ago	15-54054 15 days
29781	chrisflav author:chrisflav	feat(RingTheory/Finiteness): a finite and finitely presented algebra is finitely presented	We show that if `S` is finite as a module over `R` and finitely presented as an algebra over `R`, then it is finitely presented as a module over `R`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	357/36	Mathlib.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Finiteness/ModuleFinitePresentation.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Quotient.lean	9	1	['github-actions']	erdOne assignee:erdOne	3-5832 3 days ago	15-34501 15 days ago	15-34480 15 days
29800	YaelDillies author:YaelDillies	chore: rename `MonoidHom.toAdditive''` to `MonoidHom.toAdditiveLeft`	and alike --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	118/80	Mathlib/Algebra/Group/Action/End.lean,Mathlib/Algebra/Group/Equiv/TypeTags.lean,Mathlib/Algebra/Group/Nat/Hom.lean,Mathlib/Algebra/Group/TypeTags/Hom.lean,Mathlib/Algebra/Order/Hom/TypeTags.lean,Mathlib/Data/Finsupp/Ext.lean,Mathlib/Data/Int/Cast/Lemmas.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/FiniteAbelian/Basic.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RingTheory/FreeCommRing.lean,Mathlib/RingTheory/Valuation/RankOne.lean	14	1	['github-actions']	dagurtomas assignee:dagurtomas	3-5831 3 days ago	10-81351 10 days ago	14-71663 14 days
29871	zach1502 author:zach1502	feat(Matrix/Transvection): Gauss pivot determinant identity and pivot preservation	This PR adds two lemmas formalizing standard Gaussian pivot identities: * `Matrix.Transvection.listTransvecCol_mul_mul_listTransvecRow_pivot`: After applying the canonical left/right transvection products that clear the last column and row, the pivot (bottom-right) entry of a matrix is unchanged. Marked `@[simp]`. * `Matrix.Transvection.det_eq_detTopLeft_mul_pivot`: If the pivot entry is nonzero, then the determinant of the matrix factors as the determinant of the top-left block times the pivot entry, after performing the canonical transvections. This is the usual Gauss–pivot determinant identity. * Added simple usage tests in `MathlibTest/matrix.lean` to check that the new lemmas are usable by `simp`/`simpa`. --- --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	94/0	Mathlib/LinearAlgebra/Matrix/Transvection.lean,MathlibTest/matrix.lean	2	2	['github-actions', 'zach1502']	riccardobrasca assignee:riccardobrasca	3-5830 3 days ago	11-22140 11 days ago	12-1204 12 days
29909	Vierkantor author:Vierkantor	feat(CI): add build output to CI workflows	This PR uses the Zulip build report script (originally developed for the nightly-regression-report workflow) to add a summary of build output to other Zulip posts about workflow results. This allows us to more easily see the origin of a failure. This requires redoing the script a little to make it a bit more flexible, and the output is slightly reformatted to become consistent across the various workflows (4 of them that post to Zulip). We don't do so for the nightly-testing failures, since those run in a different workflow, and it would be a lot of work to access the command output from another workflow. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	93/69	.github/workflows/daily.yml,.github/workflows/nightly-docgen.yml,.github/workflows/nightly-regression-report.yml,scripts/zulip_build_report.sh	4	1	['github-actions']	robertylewis assignee:robertylewis	3-5829 3 days ago	10-43604 10 days ago	10-43583 10 days
29953	slashbade author:slashbade	feat: add reap for experiment	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	44/6	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,Cache/IO.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,lake-manifest.json,lakefile.lean	9	1	['github-actions']	nobody	2-81761 2 days ago	9-5815 9 days ago	0-0 0 seconds
29154	ScottCarnahan author:ScottCarnahan	feat (Algebra/Lie): Define low-degree cochains and differentials	This PR defines 1-cochains and 2-cochains of a Lie algebra `L` with coefficients in an `L`-module `M`. 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$	199/0	Mathlib.lean,Mathlib/Algebra/Lie/Abelian.lean,Mathlib/Algebra/Lie/Cochain.lean	3	7	['ScottCarnahan', 'github-actions', 'ocfnash']	ocfnash assignee:ocfnash	2-75568 2 days ago	4-79247 4 days ago	30-52301 30 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	12	['FernandoChu', 'github-actions', 'joelriou']	joelriou assignee:joelriou	2-63538 2 days ago	2-63542 2 days ago	29-62178 29 days
30088	FernandoChu author:FernandoChu	feat(CategoryTheory): `Exists` gives images	We show that (the underlying arrow of) `(exists f.obj) x` is an image. This is a prerequisite of the [MTT project](https://github.com/kyoDralliam/model-theory-topos), which aims to use the internal language of toposes to reason about e.g. sheaves.	t-category-theory	147/2	Mathlib/CategoryTheory/Limits/Shapes/Images.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/CategoryTheory/Subobject/Basic.lean	3	6	['FernandoChu', 'github-actions', 'joelriou']	nobody	2-62875 2 days ago	2-62875 2 days ago	2-77867 2 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	174/5	Mathlib/Topology/Compactness/CompactlyCoherentSpace.lean	1	4	['github-actions', 'joelriou', 'scholzhannah']	ADedecker assignee:ADedecker	2-62486 2 days ago	3-48208 3 days ago	102-28619 102 days
30109	scholzhannah author:scholzhannah	feat: the subcomplexes of a (relative classical) CW complex form a completely distributive lattice	In this PR we prove that the space of subcomplexes `Subcomplex C` of a (relative classical) CW complex `C` is a `CompletelyDistribLattice`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	390/1	Mathlib/Topology/CWComplex/Classical/Subcomplex.lean	1	1	['github-actions']	nobody	2-58688 2 days ago	2-60719 2 days ago	2-60752 2 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	6	['faenuccio', 'github-actions', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	2-58574 2 days ago	26-31844 26 days ago	77-48607 77 days
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 awaiting-author 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	9	['Ruben-VandeVelde', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	2-58512 2 days ago	2-58512 2 days ago	14-7845 14 days
30105	slashbade author:slashbade	feat: add `reap` as internal tactic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-meta	664/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/Reap.lean,Mathlib/Tactic/Reap/Basic.lean,Mathlib/Tactic/Reap/Future/Basic.lean,Mathlib/Tactic/Reap/Future/PP.lean,Mathlib/Tactic/Reap/OpenAIClient/Basic.lean,Mathlib/Tactic/Reap/OpenAIClient/Test.lean,Mathlib/Tactic/Reap/OpenAIClient/Types.lean,Mathlib/Tactic/Reap/Options.lean,Mathlib/Tactic/Reap/PremiseSelection/API.lean,Mathlib/Tactic/Reap/PremiseSelection/Syntax.lean,Mathlib/Tactic/Reap/PremiseSelection/Test.lean,Mathlib/Tactic/Reap/Requests/Basic.lean,Mathlib/Tactic/Reap/Requests/Future.lean,Mathlib/Tactic/Reap/Requests/Test.lean,Mathlib/Tactic/Reap/Tactic/Generator.lean,Mathlib/Tactic/Reap/Tactic/Search.lean,Mathlib/Tactic/Reap/Tactic/Syntax.lean,Mathlib/Tactic/Reap/Tactic/Test.lean	21	1	['github-actions']	nobody	2-58404 2 days ago	2-69828 2 days ago	0-0 0 seconds
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	8	['YaelDillies', 'eric-wieser', 'github-actions', 'riccardobrasca']	eric-wieser assignee:eric-wieser	2-57617 2 days ago	26-69438 26 days ago	30-30781 30 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']	riccardobrasca assignee:riccardobrasca	2-57555 2 days ago	30-57643 1 month ago	30-57668 30 days
29314	Louddy author:Louddy	feat(SkewMonoidAlgebra): Lifts for skew monoid algebras	Lemmas about different kinds of "lifts" to `SkewMonoidAlgebra` - Similar in spirit to the MonoidAlgebra.Lift file. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [x] depends on: #29310 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		238/2	Mathlib.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/SkewMonoidAlgebra/Lift.lean	3	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	riccardobrasca assignee:riccardobrasca	2-57507 2 days ago	4-25355 4 days ago	4-30773 4 days
29143	RemyDegenne author:RemyDegenne	feat(Probability/Decision): basic properties of the Bayes risk	- Comparison of the Bayes risk and the minimax risk - Maximal value of the Bayes risk and particular cases where it equals that value - Data-processing inequality --- - [x] depends on: #29137 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	262/1	Mathlib.lean,Mathlib/Probability/Decision/Risk/Basic.lean,Mathlib/Probability/Decision/Risk/Defs.lean	3	14	['EtienneC30', 'RemyDegenne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	EtienneC30 assignee:EtienneC30	2-54748 2 days ago	2-54748 2 days ago	4-70640 4 days
30029	ADedecker author:ADedecker	feat: define IsRightUniformGroup and IsLeftUniformGroup	This mostly contains the definition and additional documentation. Future PRs will take care of expanding the theory, and proving in particular that `IsUniformGroup` is precisely the conjuction of these two typeclasses. --- - [x] depends on: #30025 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	199/36	Mathlib/Topology/Algebra/IsUniformGroup/Basic.lean,Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean	2	9	['ADedecker', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-54053 2 days ago	5-28523 5 days ago	5-39755 5 days
30085	riccardobrasca author:riccardobrasca	feat: add Mathlib.RingTheory.RootsOfUnity.Units	We abb basic results about cyclotomic units. From `flt-regular`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra t-number-theory awaiting-author label:t-algebra$	112/0	Mathlib.lean,Mathlib/RingTheory/RootsOfUnity/Units.lean	2	14	['faenuccio', 'github-actions', 'riccardobrasca']	faenuccio assignee:faenuccio	2-51539 2 days ago	2-55903 2 days ago	0-78074 21 hours
28349	kckennylau author:kckennylau	feat(Meta): add notation for naming stacked polynomials	This PR changes the notation for naming formal variables associated to recursive polynomial-like objects. Registration is done only once per each polynomial-like functor. Usage: ```lean register_poly_vars "[" "]" Polynomial Polynomial.C Polynomial.X register_poly_vars (mv := true) "[" "]" MvPolynomial MvPolynomial.C MvPolynomial.X name_poly_vars R[a,b][C] name_poly_vars _[x,y,z] ``` `_[[x,y,z]]` allows for the hole to be substituted by any base ring, so `(x : R[[x,y,z]])` will be valid syntax. --- I have not mass deployed the new syntax at every possible location, I plan to do that in a future PR following this. Zulip: [#mathlib4 > Notation for polynomial variables](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Notation.20for.20polynomial.20variables) This is a refactor of the currently existing [Mathlib.Tactic.namePolyVarsOver](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Tactic/Ring/NamePolyVars.html#Mathlib.Tactic.namePolyVarsOver). More explicitly, the current invocation `name_poly_vars x,y over R` is now `poly_variable R[x,y]`. The behaviours inherited from `name_poly_vars` are: * We do not synthesize the necessary instances (such as `[CommRing R]`) at the point of declaration, but only when the new notations are used. * We refer to an explicit term (`R` in the examples) which is "fixed", in the sense that: * it is only valid for `R` explicitly, and not any other `variable` such as `S`. * it has built-in hygiene, so if you shadow the variable by declaring a new `variable (R : Type)`, it will still refer to the old one. And the new behaviours are: Currently only `x` and `y` are new notations, but in the new tactic the whole ring `R[x,y]` is also available as notation. * Currently only the forward direction (i.e. elaboration, going from `x` to `MvPolynomial.X 0`) is implemented, but in the new tactic we also implement the backward direction, printing `MvPolynomial.X 0` back as `x` (and `MvPolynomial (Fin 2) R` is printed as `R[x,y]`). * Support beyond just `MvPolynomial`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	652/88	Counterexamples/CliffordAlgebraNotInjective.lean,Mathlib.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/PolyVariable.lean,Mathlib/Tactic/Ring/NamePolyVars.lean,MathlibTest/PolyVariable.lean,scripts/noshake.json	10	80	['JovanGerb', 'adamtopaz', 'eric-wieser', 'github-actions', 'j-loreaux', 'kckennylau', 'kim-em', 'plp127', 'robertmaxton42', 'sgouezel']	adamtopaz assignee:adamtopaz	2-50108 2 days ago	10-42421 10 days ago	50-22343 50 days
30107	grunweg author:grunweg	chore: track occurrences of 'nonrec' as technical debt	Matches leanprover-community/leanprover-community.github.io#689: only merge when that is deemed a good idea. -------- TODO: make the count more robust, for instance count all occurrences of "^nonrec " plus those of "^[private\|protected] nonrec ". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt CI	1/0	scripts/technical-debt-metrics.sh	1	1	['github-actions']	nobody	2-47887 2 days ago	2-65137 2 days ago	2-65116 2 days
26332	Timeroot author:Timeroot	feat(ModelTheory/Definability): TermDefinable functions	This PR continues the work from #23506. Original PR: https://github.com/leanprover-community/mathlib4/pull/23506	t-logic	145/0	Mathlib/Data/Rel.lean,Mathlib/ModelTheory/Definability.lean,scripts/noshake.json	3	28	['Timeroot', 'github-actions', 'mathlib4-merge-conflict-bot', 'staroperator']	fpvandoorn assignee:fpvandoorn	2-46750 2 days ago	18-37835 18 days ago	99-86022 99 days
27819	BGuillemet author:BGuillemet	feat(CategoryTheory/Yoneda): add curried version of Yoneda lemma for heterogeneous universes, and other version of homNatIso	Prove a curried version of `yonedaCompUliftFunctorEquiv`, ie a completely functorial version of the Yoneda lemma with heterogeneous universes. Dually, prove a curried version of `coyonedaCompUliftFunctorEquiv`, ie a completely functorial version of the coYoneda lemma with heterogeneous universes. In addition, prove a functorial version of `FullyFaithful.natEquiv` using `coyoneda` instead of `yoneda` (previously, the only functorial version of `FullyFaithful.natEquiv` were `homNatIso`, which is written using `yoneda`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory	159/66	Mathlib/CategoryTheory/Abelian/GrothendieckCategory/EnoughInjectives.lean,Mathlib/CategoryTheory/Filtered/Final.lean,Mathlib/CategoryTheory/Limits/IndYoneda.lean,Mathlib/CategoryTheory/Limits/Indization/FilteredColimits.lean,Mathlib/CategoryTheory/Limits/Yoneda.lean,Mathlib/CategoryTheory/Monoidal/Braided/Reflection.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/Basic.lean,Mathlib/CategoryTheory/Yoneda.lean	8	12	['BGuillemet', 'github-actions', 'joelriou', 'mathlib4-merge-conflict-bot']	nobody	2-43505 2 days ago	2-43505 2 days ago	15-5813 15 days
26287	mbkybky author:mbkybky	feat(Data/ENat/Lattice): coercion to `WithBot ℕ∞` commutes with `biSup`	The coercion from `ℕ∞` to `WithBot ℕ∞` commutes with `biSup` and `biInf`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	24/0	Mathlib/Data/ENat/Lattice.lean	1	5	['github-actions', 'kckennylau', 'mbkybky']	ericrbg assignee:ericrbg	2-42579 2 days ago	2-42579 2 days ago	82-43802 82 days
27971	smmercuri author:smmercuri	feat: weak approximation theorems for infinite places of a number field	Under the diagonal embedding into infinite places, a number field $K$ is dense inside both the product $\prod_{v \mid \infty} (K, v)$, where $(K, v)$ denotes $K$ equipped with $v$'s topology, and the infinite adele ring $\prod_v K_v$. This PR continues the work from #22153. Original PR: https://github.com/leanprover-community/mathlib4/pull/22153 --- - [x] depends on: #27969	large-import FLT t-algebra t-number-theory label:t-algebra$	98/2	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean	3	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'smmercuri']	nobody	2-42141 2 days ago	2-46944 2 days ago	2-49594 2 days
29020	grunweg author:grunweg	chore: squeeze a few non-terminal simps	Founds by the flexible linter in #28962. --- - [ ] depends on : #29027 - [ ] depends on: #30106 - [ ] depends on: #30091 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	91/70	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/Field/GeomSum.lean,Mathlib/Analysis/CStarAlgebra/SpecialFunctions/PosPart.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Complex/ValueDistribution/FirstMainTheorem.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/Meromorphic/NormalForm.lean,Mathlib/Analysis/Meromorphic/TrailingCoefficient.lean,Mathlib/Analysis/NormedSpace/MultipliableUniformlyOn.lean,Mathlib/Analysis/ODE/Gronwall.lean,Mathlib/Analysis/Real/Pi/Irrational.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/IntegralRepresentation.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSq.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSqIntegral.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean,Mathlib/CategoryTheory/SmallObject/Construction.lean,Mathlib/Combinatorics/Additive/VerySmallDoubling.lean,Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SetFamily/KruskalKatona.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkDecomp.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Data/Nat/Digits/Lemmas.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/Geometry/Manifold/Riemannian/Basic.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/LinearAlgebra/TensorProduct/Associator.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Periodic.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean,Mathlib/NumberTheory/Zsqrtd/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/OrderIsoNat.lean,Mathlib/Probability/ProbabilityMassFunction/Constructions.lean,Mathlib/RingTheory/HahnSeries/Lex.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/MvPowerSeries/Substitution.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean,Mathlib/Tactic/NormNum/Irrational.lean,Mathlib/Topology/Algebra/InfiniteSum/UniformOn.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/PartitionOfUnity.lean	49	33	['YaelDillies', 'b-mehta', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	2-41997 2 days ago	2-42534 2 days ago	0-1958 32 minutes
30101	wwylele author:wwylele	feat(Algebra/HahnEmbedding): ArchimedeanStrata is non-empty	This is a small part of #27268 (Hahn embedding theorem). Separated out for easy review while waiting for the other dependency. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	8/0	Mathlib/Algebra/Order/Module/HahnEmbedding.lean	1	1	['github-actions']	nobody	2-38807 2 days ago	3-15024 3 days ago	3-15067 3 days
27552	Equilibris author:Equilibris	chore: Move variables into `variable` declaration 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 awaiting-author	16/10	Mathlib/Data/TypeVec.lean	1	12	['Equilibris', 'eric-wieser', 'github-actions', 'pechersky', 'plp127']	pechersky assignee:pechersky	2-32202 2 days ago	3-85851 3 days ago	64-38904 64 days
30114	euprunin author:euprunin	chore(Data/Finset): golf entire `powersetCard_zero` using `grind`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	1/5	Mathlib/Data/Finset/Powerset.lean	1	1	['github-actions']	nobody	2-29204 2 days ago	2-29204 2 days ago	2-29275 2 days
25969	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupHomology/Functoriality): the degree 1 part of the corestriction-coinflation exact sequence	Given a `G`-representation `A` and a normal subgroup `S` of `G`, this PR defines the corestriction-coinflation short complex `H₁(S, A) ⟶ H₁(G, A) ⟶ H₁(G ⧸ S, A_S)` induced by the natural inclusion `S → G` and projections `G → G / S, A → A_S`. We prove it's exact, and that the righthand map is an epimorphism. --- - [x] depends on: #21652 - [x] depends on: #21732 - [x] depends on: #21733 - [x] depends on: #21735 - [x] depends on: #21736 - [x] depends on: #21738 - [x] depends on: #25868 - [x] depends on: #25873 - [x] depends on: #25880 - [x] depends on: #25884 - [x] depends on: #25888 - [x] depends on: #25939 - [x] depends on: #25952 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- Earlier version at #22656.	t-algebra label:t-algebra$	262/9	Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Functoriality.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean	5	n/a	['101damnations', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-23454 2 days ago	unknown	unknown
30108	EtienneC30 author:EtienneC30	refactor: generalize LinearMap.toMatrix₂ and Matrix.toLinearMap₂ to sesquilinear forms	Generalize [LinearMap.toMatrix₂](https://leanprover-community.github.io/mathlib4_docs/Mathlib/LinearAlgebra/Matrix/SesquilinearForm.html#LinearMap.toMatrix%E2%82%82) to take a sesquilinear map as input. Create `Matrix.toLinearMapₛₗ₂` to generalize [Matrix.toLinearMap₂](https://leanprover-community.github.io/mathlib4_docs/Mathlib/LinearAlgebra/Matrix/SesquilinearForm.html#Matrix.toLinearMap%E2%82%82) to sesquilinear maps, while still keeping [Matrix.toLinearMap₂](https://leanprover-community.github.io/mathlib4_docs/Mathlib/LinearAlgebra/Matrix/SesquilinearForm.html#Matrix.toLinearMap%E2%82%82) to avoid specifying `RingHom.id R` in the bilinear case. Only do so for maps which are semilinear in the first coordinate to avoid specifying `RingHom.id R` for the second homomorphism. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	56/12	Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean	1	1	['github-actions']	nobody	2-22578 2 days ago	2-60980 2 days ago	0-0 0 seconds
30116	FormulaRabbit81 author:FormulaRabbit81	feat(Measure): proof that a relatively compact set of measures is tight	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-measure-probability	196/2	Mathlib/MeasureTheory/Measure/Tight.lean	1	1	['github-actions']	nobody	2-16068 2 days ago	2-16105 2 days ago	2-16139 2 days
28604	alreadydone author:alreadydone	chore(Algebra/Ring/Defs): add two classes (minimally invasive version)	Add the missing `NonAssocComm(Semi)ring` classes and add some missing instances between existing classes. Contrary to #28532, the approach here doesn't add any new `extends`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	59/17	Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean	3	19	['alreadydone', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	2-10052 2 days ago	2-10052 2 days ago	2-69069 2 days
29956	NotWearingPants author:NotWearingPants	feat(Algebra/Polynomial): small and useful lemmas	feat(Algebra/Polynomial): added many small and useful lemmas about polynomials --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra label:t-algebra$	299/74	Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/Eval/Coeff.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/Eval/Degree.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/FieldTheory/IsAlgClosed/Basic.lean,Mathlib/FieldTheory/NormalizedTrace.lean,Mathlib/RingTheory/SimpleRing/Basic.lean,Mathlib/RingTheory/Trace/Basic.lean	16	44	['NotWearingPants', 'erdOne', 'github-actions', 'kckennylau', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	2-7761 2 days ago	2-10769 2 days ago	8-80121 8 days
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	14	['fweth', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	2-5865 2 days ago	26-43028 26 days ago	46-15189 46 days
27978	smmercuri author:smmercuri	feat: `InfinitePlace.Extension` API for extensions of infinite places.	If `L / K` are fields and `v : InfinitePlace K`, then we define and add basic API for `v.Extension L` : the subtype of `w : InfinitePlace L` whose restriction to `K` matches `v`. This PR continues the work from #24881. Original PR: https://github.com/leanprover-community/mathlib4/pull/24881 --- - [x] depends on: #27977	FLT t-number-theory	49/0	Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	MichaelStollBayreuth assignee:MichaelStollBayreuth	2-5863 2 days ago	9-37040 9 days ago	9-64941 9 days
29941	themathqueen author:themathqueen	feat(Algebra/Star): define the convolution star on linear maps	This pr defines the _convolution_ star operation on linear maps `E →ₗ F` where `(star f) x = star (f (star x))`. This corresponds to a map being star-preserving, i.e., a map is self-adjoint iff it is star-preserving. The name "convolution star" is just to match the naming of the _convolution_ product in #25183. This is scoped to `ConvolutionStar` as to not conflict with the global instance on `E →ₗ[𝕜] E` on finite-dimensional Hilbert spaces, where `star` is defined as `LinearMap.adjoint`. In a finite-dimensional C⋆-algebra with a positive linear functional, which induces the GNS Hilbert space (TODO) and a coalgebra given by the adjoint of the multiplication map and the algebra unit map (TODO), we get a star ring where multiplication is given by the convolution product and star is given by the convolution star. In such a space, we can then define the isomorphism `(E →ₗ[ℂ] F) ≃⋆ₐ (F ⊗[ℂ] Eᵐᵒᵖ)`, which is an important identification in the theory of non-commutative graphs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	94/0	Mathlib.lean,Mathlib/Algebra/Star/Convolution.lean	2	1	['github-actions']	ocfnash assignee:ocfnash	2-5855 2 days ago	9-49479 9 days ago	9-50240 9 days
30117	euprunin author:euprunin	chore(Data/Rat): golf entire `inv_intCast_num_of_pos` and `den_inv_of_ne_zero` using `simp`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	2/9	Mathlib/Data/Rat/Lemmas.lean	1	1	['github-actions']	nobody	1-78128 1 day ago	1-78143 1 day ago	1-78176 1 day
27370	euprunin author:euprunin	chore(Tactic/CancelDenoms): golf entire `cancel_factors_eq` using `grind`	--- 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 easy	1/11	Mathlib/Tactic/CancelDenoms/Core.lean	1	7	['euprunin', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	alexjbest assignee:alexjbest	1-75794 1 day ago	8-63982 8 days ago	73-12368 73 days
29661	euprunin author:euprunin	chore(Data): golf entire `tail_cons` using `rfl`. fix `coe_eq_image_val` theorem statement.	--- Show trace profiling of `tail_cons`: <10 ms before, <10 ms after 🎉 ### Trace profiling of `tail_cons` before PR 29661 ```diff diff --git a/Mathlib/Data/Seq/Defs.lean b/Mathlib/Data/Seq/Defs.lean index fc03ab5f49..aba7137487 100644 --- a/Mathlib/Data/Seq/Defs.lean +++ b/Mathlib/Data/Seq/Defs.lean @@ -229,6 +229,7 @@ theorem head_cons (a : α) (s) : head (cons a s) = some a := by theorem tail_nil : tail (nil : Seq α) = nil := rfl +set_option trace.profiler true in @[simp] theorem tail_cons (a : α) (s) : tail (cons a s) = s := by obtain ⟨f, al⟩ := s ``` ``` ✔ [428/428] Built Mathlib.Data.Seq.Defs (3.8s) Build completed successfully (428 jobs). ``` ### Trace profiling of `tail_cons` after PR 29661 ```diff diff --git a/Mathlib/Data/Seq/Defs.lean b/Mathlib/Data/Seq/Defs.lean index fc03ab5f49..ad65ea7a8f 100644 --- a/Mathlib/Data/Seq/Defs.lean +++ b/Mathlib/Data/Seq/Defs.lean @@ -229,11 +229,9 @@ theorem head_cons (a : α) (s) : head (cons a s) = some a := by theorem tail_nil : tail (nil : Seq α) = nil := rfl +set_option trace.profiler true in @[simp] -theorem tail_cons (a : α) (s) : tail (cons a s) = s := by - obtain ⟨f, al⟩ := s - apply Subtype.eq - dsimp [tail, cons] +theorem tail_cons (a : α) (s) : tail (cons a s) = s := rfl theorem head_eq_some {s : Seq α} {x : α} (h : s.head = some x) : s = cons x s.tail := by diff --git a/Mathlib/Data/Set/Functor.lean b/Mathlib/Data/Set/Functor.lean index 35063a2feb..7b52b24536 100644 --- a/Mathlib/Data/Set/Functor.lean +++ b/Mathlib/Data/Set/Functor.lean @@ -139,10 +139,7 @@ as was defined in `Data.Set.Notation`. -/ attribute [local instance] Set.monad in /-- The coercion from `Set.monad` as an instance is equal to the coercion in `Data.Set.Notation`. -/ theorem coe_eq_image_val (t : Set s) : - @Lean.Internal.coeM Set s α _ _ t = (t : Set α) := by - change ⋃ (x ∈ t), {x.1} = _ - ext - simp + @Lean.Internal.coeM Set s α _ _ t = (t : Set α) := rfl variable {β : Set α} {γ : Set β} {a : α} ``` ``` ✔ [428/428] Built Mathlib.Data.Seq.Defs (1.0s) Build completed successfully (428 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	2/5	Mathlib/Data/Seq/Defs.lean,Mathlib/Data/Set/Functor.lean	2	7	['Ruben-VandeVelde', 'eric-wieser', 'euprunin', 'github-actions']	nobody	1-75097 1 day ago	1-75144 1 day ago	4-20515 4 days
26464	joelriou author:joelriou	feat(LinearAlgebra): generators of pi tensor products	In this PR, we show that the `R`-module `⨂[R] i, M i` is finitely generated if the index type is finite and all `M i` are finitely generated. This follows from a more precise result about generators of `⨂[R] i, M i`. --- This PR continues the work from #18725. Original PR: https://github.com/leanprover-community/mathlib4/pull/18725	file-removed t-algebra label:t-algebra$	270/5	Mathlib.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/SubtypeNeLift.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/LinearAlgebra/TensorPower/Symmetric.lean,Mathlib/RingTheory/PiTensorProduct.lean,Mathlib/SetTheory/Cardinal/Finite.lean	10	21	['eric-wieser', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	mattrobball assignee:mattrobball	1-70919 1 day ago	13-27741 13 days ago	79-77113 79 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.boundedEulerChar`: The Euler characteristic over a finite set * `ChainComplex.eulerChar`: The Euler characteristic as an infinite sum * `ChainComplex.homologyBoundedEulerChar`: The homological Euler characteristic over a finite set * `ChainComplex.homologyEulerChar`: The homological Euler characteristic as an infinite sum Both bounded and infinite definitions work with ℤ-indexed complexes over any ring R. The file also includes theorems relating the formally infinite sums to finite sums when there is finite support: * `ChainComplex.eulerChar_eq_boundedEulerChar`: The infinite Euler characteristic equals the bounded one when the chain complex vanishes outside a finite set * `ChainComplex.homologyEulerChar_eq_homologyBoundedEulerChar`: The infinite homological Euler characteristic equals the bounded one when homology vanishes outside a finite set ### Main result (in `EulerPoincare.lean`) * `ChainComplex.eulerChar_eq_homology_eulerChar`: For ℤ-indexed bounded chain complexes of finite-dimensional modules over a division ring, the alternating sum of chain dimensions equals the alternating sum of homology dimensions. --- Related to: #29639, #29643, #29646	new-contributor t-algebra label:t-algebra$	444/0	Mathlib.lean,Mathlib/Algebra/Homology/EulerCharacteristic.lean,Mathlib/Algebra/Homology/EulerPoincare.lean	3	19	['github-actions', 'jessealama', 'joelriou', 'kim-em']	dagurtomas assignee:dagurtomas	1-70864 1 day ago	16-44650 16 days ago	17-54499 17 days
28162	EtienneC30 author:EtienneC30	feat: define positive semidefinite sesquilinear maps	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	34/0	Mathlib/LinearAlgebra/SesquilinearForm.lean	1	6	['EtienneC30', 'github-actions', 'mathlib4-merge-conflict-bot', 'themathqueen']	nobody	1-66786 1 day ago	4-57443 4 days ago	15-19168 15 days
30119	Ruben-VandeVelde author:Ruben-VandeVelde	feat: WithTop/Bot.mapD	To replace Option.elim; working towards #27918 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	32/4	Mathlib/Order/Hom/WithTopBot.lean,Mathlib/Order/WithBot.lean	2	1	['github-actions']	nobody	1-65479 1 day ago	1-65663 1 day ago	1-65706 1 day
28793	grunweg author:grunweg	feat: smooth immersions	Define smooth immersions between manifolds. We use a definition which allows for corners, infinite dimension and arbitrary fields. Future PRs will - prove that immersions are C^n (#28796), - prove another characterisation of immersions: f is immersed at x iff the differential df_x splits, i.e. is injective, has closed range and its image has a closed complement, and in particular that a map between finite-dimensional manifolds over a complete field is an immersion iff its differential is injective, - use this to prove that the product (#28853) and composition of immersions is an immersion, - use this theory to give more conceptual proofs of half of `Manifold/Instances/Icc.lean` (#29077) - define smooth embeddings and immersed and embedded smooth submanifolds --- - [x] depends on: #28701 Most of the above has been done at https://github.com/grunweg/mathlib4/tree/MR-define-immersions. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry awaiting-author	469/0	Mathlib.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,docs/references.bib	4	42	['chrisflav', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'sgouezel']	sgouezel assignee:sgouezel	1-62784 1 day ago	1-62784 1 day ago	7-84139 7 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	13	['D-Thomine', 'github-actions', 'leanprover-community-bot-assistant', 'lua-vr', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	urkud assignee:urkud	1-59763 1 day ago	38-78606 1 month ago	45-48074 45 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	18	['github-actions', 'loefflerd', 'mariainesdff', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	loefflerd and mattrobball assignee:loefflerd assignee:mattrobball	1-56539 1 day ago	17-45762 17 days ago	74-78772 74 days
30123	erdOne author:erdOne	feat(Topology): add `IsCompact.closure_eq_nhdsKer`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	11/0	Mathlib/Topology/Separation/Regular.lean	1	1	['github-actions']	nobody	1-56318 1 day ago	1-56328 1 day ago	1-56362 1 day
30124	erdOne author:erdOne	feat(RingTheory): `IsAdicComplete I R ↔ CompleteSpace R ∧ T2Space R`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology label:t-algebra$	40/0	Mathlib/Order/Filter/Bases/Basic.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Topology.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Separation/Basic.lean	5	1	['github-actions']	nobody	1-55265 1 day ago	1-55265 1 day ago	1-55369 1 day
27673	b-reinke author:b-reinke	feat(GroupTheory/FreeGroup): add cyclic reduction of words	This PR adds the definition of `reduceCyclically`. This function produces a subword of a word `w` by cancelling the first and last letters of `w` as long as possible. If `w` is reduced, the resulting word will be cyclically reduced. 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. - [x] depends on: #25966 - [x] depends on: #27672 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	76/0	Mathlib/GroupTheory/FreeGroup/CyclicallyReduced.lean	1	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	1-54378 1 day ago	2-68920 2 days ago	2-70232 2 days
27270	EtienneC30 author:EtienneC30	chore: turn WithLp into a structure	Turn `WithLp` into a one field structure, as was suggested many times on Zulip and discussed here: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/defeq.20abuse.20in.20.60WithLp.60/near/526234806. Here is what this PR does: - The instances on `WithLp p α` which were defeq to those on `α` (algebraic instances, topology, uniformity, bornology) are now pulled back from `α` along `WithLp.equiv p α`. A few declarations are added to ease the process, such as versions of `WithLp.equiv` as a homeomorphism or a uniform isomorphism. - It introduces some definitions to equip `α × β` with the Lp distance, and similarly for `Π i, α i`. This is then used to define relevant instances on type synonyms, such as for matrix norms. - The PR fixes all the defeq abuses (which break obviously). --- - [x] depends on: #28469 - [x] depends on: #28470 - [x] depends on: #28471 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis	624/408	Archive/Hairer.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Calculus/FDeriv/WithLp.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/InnerProductSpace/ProdL2.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/Normed/Algebra/UnitizationL1.lean,Mathlib/Analysis/Normed/Lp/LpEquiv.lean,Mathlib/Analysis/Normed/Lp/MeasurableSpace.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/Analysis/RCLike/Inner.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/CrossProduct.lean,Mathlib/Geometry/Manifold/Instances/Icc.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/Spectrum.lean,Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean,Mathlib/MeasureTheory/Measure/Haar/OfBasis.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/MeasureTheory/SpecificCodomains/WithLp.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/NumberTheory/NumberField/Ideal/Asymptotics.lean	33	46	['EtienneC30', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	j-loreaux assignee:j-loreaux	1-53938 1 day ago	1-55579 1 day ago	49-61090 49 days
29935	ineol author:ineol	fix: cache fails when Mathlib is a nightly dependency	Cache should on check for the nightly-testing remote when it is run from the Mathlib root and not from a repo which depends on Mathlib. Fixes #28594 --- I don't know how to test this fix since it would need to be in a nightly release, but at least it is working when ran from from tip of master. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor CI	3/3	Cache/Requests.lean	1	3	['github-actions', 'ineol', 'robin-carlier']	kim-em assignee:kim-em	1-49923 1 day ago	1-49923 1 day ago	9-60566 9 days
29959	DavidLedvinka author:DavidLedvinka	feat(Probability): existence of independent random variables with a given sequence of distributions	In some sense none of these are necessary, especially `exists_hasLaw`, because one could just use the identity or the projections of the product explicitly, but I think using these lemmas when one wants to introduce random variables in probabilistic proofs will be much more natural. Also added needed `fun_prop` tags to `aemeasurable_id` lemmas which randomly generalized `charFun_map_smul` to not need `SecondCountableTopology` (detected by the linter).	large-import t-measure-probability awaiting-author	37/5	Mathlib/MeasureTheory/Measure/CharacteristicFunction.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/Probability/HasLaw.lean	3	4	['github-actions', 'mathlib4-merge-conflict-bot', 'sgouezel']	nobody	1-44573 1 day ago	1-44573 1 day ago	5-76048 5 days
29851	joelriou author:joelriou	feat(CategoryTheory): limits of objects satisfying a property	This PR dualises #29843. --- - [x] depends on: #29849 - [x] depends on: #29843 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	141/5	Mathlib.lean,Mathlib/CategoryTheory/ObjectProperty/ColimitsOfShape.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsOfShape.lean	3	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-42473 1 day ago	5-42695 5 days ago	5-42673 5 days
27364	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupCohomology): cohomology of finite cyclic groups	Let `k` be a commutative ring, `G` a group and `A` a `k`-linear `G`-representation. Given endomorphisms `φ, ψ : A ⟶ A` such that `φ ∘ ψ = ψ ∘ φ = 0`. Denote by `Chains(A, φ, ψ)` the periodic chain complex `... ⟶ A --φ--> A --ψ--> A --φ--> A --ψ--> A ⟶ 0` and by `Cochains(A, φ, ψ)` the periodic cochain complex `0 ⟶ A --ψ--> A --φ--> A --ψ--> A --φ--> A ⟶ ...`. When `G` is finite and generated by `g : G`, then `P := Chains(k[G], N, ρ(g) - Id)` (with `ρ` the left regular representation) is a projective resolution of `k` as a trivial representation. In this PR we show that for `A : Rep k G`, `Hom(P, A)` is isomorphic to `Cochains(A, N, ρ_A(g) - Id)` as a complex of `k`-modules, and hence the cohomology of this complex computes group cohomology. --- - [x] depends on: #27362 - [x] depends on: #27361 - [x] depends on: #27363 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	142/1	Mathlib.lean,Mathlib/RepresentationTheory/Homological/FiniteCyclic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/FiniteCyclic.lean	3	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-38942 1 day ago	1-39276 1 day ago	1-41844 1 day
27365	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupHomology): homology of finite cyclic groups	Let `k` be a commutative ring, `G` a group and `A` a `k`-linear `G`-representation. Given endomorphisms `φ, ψ : A ⟶ A` such that `φ ∘ ψ = ψ ∘ φ = 0`. Denote by `Chains(A, φ, ψ)` the periodic chain complex `... ⟶ A --φ--> A --ψ--> A --φ--> A --ψ--> A ⟶ 0`. When `G` is finite and generated by `g : G`, then `P := Chains(k[G], N, ρ(g) - Id)` (with `ρ` the left regular representation) is a projective resolution of `k` as a trivial representation. In this PR we show that for `A : Rep k G`, `(A ⊗ P)_G` is isomorphic to `Chains(A, N, ρ_A(g) - Id)` as a complex of `k`-modules, and hence the homology of this complex computes group homology. --- - [x] depends on: #27362 - [x] depends on: #27361 - [x] depends on: #27363 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	142/1	Mathlib.lean,Mathlib/RepresentationTheory/Homological/FiniteCyclic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/FiniteCyclic.lean	3	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-38934 1 day ago	1-39162 1 day ago	1-41610 1 day
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	1-38173 1 day ago	78-29979 2 months ago	78-34288 78 days
30131	fpvandoorn author:fpvandoorn	feat: alias_in attribute	* A small wrapper for adding an alias of a declaration in another namespace. * application time `.afterCompilation` is necessary for `#eval` to work correctly * Docstrings are copied, jump-to-definition works (no test in the test file, but tested locally) * To be used for CW-complexes, where lemmas are frequently duplicated between `RelCWComplex` and `CWComplex`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) cc @scholzhannah	t-meta	93/0	Mathlib.lean,Mathlib/Util/AliasIn.lean,MathlibTest/Util/AliasIn.lean	3	1	['github-actions']	nobody	1-35840 1 day ago	1-35840 1 day ago	1-35819 1 day
30133	smmercuri author:smmercuri	feat: `WithVal v` and `WithVal w` are isomorphic as uniform spaces when `v` and `w` are equivalent valuations	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		93/0	Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	2	1	['github-actions']	nobody	1-33668 1 day ago	1-33740 1 day ago	1-33717 1 day
25603	callesonne author:callesonne	feat(Bicategory/InducedBicategory): add induced bicategories	This PR adds a way of inducing a full bicategory structure on given type of objects with a map to the objects of some bicategory (i.e. with all 1-morphisms and all 2-morphisms). I have not tried to implement "locally induced bicategories" which should allow for a sub-class of 1-morphisms as well. This is because copying the naive approach and replacing the map `F` as for induced categories with a functor, one runs into issues when the equalities in `F.map_comp` and `F.map_id` are not defeq equalities. One could probably define locally full sub-bicategories using a pair of `ObjectProperty` + `MorphismProperty` to ensure that the inclusions are actually defeq, but I did not want to get into this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	68/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/InducedBicategory.lean	2	5	['callesonne', 'github-actions', 'robin-carlier']	robin-carlier assignee:robin-carlier	1-33323 1 day ago	103-64468 3 months ago	13-48345 13 days
30135	erdOne author:erdOne	feat(RingTheory): `ValuativeRel` on subrings	--- @pechersky do we want this? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	15/0	Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean	1	1	['github-actions']	nobody	1-31340 1 day ago	1-31349 1 day ago	1-31383 1 day
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/)	file-removed new-contributor t-measure-probability awaiting-author	236/18	Mathlib.lean,Mathlib/MeasureTheory/Function/EssSup.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Basic.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/NNReal.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/Probability/Moments/IntegrableExpMul.lean,Mathlib/Probability/UniformOn.lean,Mathlib/Topology/ContinuousMap/CompactlySupported/Basic.lean,Mathlib/Topology/ContinuousMap/CompactlySupported/Integral.lean,Mathlib/Topology/UrysohnsLemma.lean	11	29	['CoolRmal', 'EtienneC30', 'FormulaRabbit81', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	RemyDegenne assignee:RemyDegenne	1-28647 1 day ago	1-28647 1 day ago	22-16948 22 days
30126	YaelDillies author:YaelDillies	feat: characterise when `Set.rangeFactorization` is injective	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	4/0	Mathlib/Data/Set/Operations.lean	1	2	['github-actions', 'plp127']	nobody	1-26838 1 day ago	1-26838 1 day ago	0-17414 4 hours
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/)	awaiting-author	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	8	['github-actions', 'j-loreaux', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'sgouezel']	dupuisf assignee:dupuisf	1-24037 1 day ago	1-24037 1 day ago	29-76762 29 days
28492	euprunin author:euprunin	chore(Data/Finite): deprecate `card_le_of_injective`, `card_le_of_surjective` and `card_sum`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	14/27	Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkCounting.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.lean,Mathlib/Data/Finite/Card.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/GroupTheory/Index.lean	6	3	['euprunin', 'github-actions', 'tb65536']	nobody	1-23976 1 day ago	1-42006 1 day ago	13-27739 13 days
30130	Bergschaf author:Bergschaf	feat(GroupTheory/FreeGroup/Orbit): The orbit of a point generated by parts of a free group can be "duplicated"	Applying `w⁻¹` to the orbit generated by all elements of a free group that start with `w` yields the orbit generated by all the words that start with every letter execpt `w⁻` (and the original point) The orbit of a point `x` generated by a set of group elements `s` defined as all the points that can be reached by applying the elements of `s` to `x`. A special case of this result is needed for the banach tarski theorem. --- I tried my best to shorten the proof of orbit.duplicate, but is quite long. There are some aspects that are duplicated due to case splits but I don't konw if it is possible to avoid that. I'd apprectiate some tips on that. And I'm not quite sure about the naming of the theorems and definitions, please let me know if you have other (better) ideas! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	135/0	Mathlib.lean,Mathlib/GroupTheory/FreeGroup/Orbit.lean	2	1	['github-actions']	nobody	1-23851 1 day ago	1-39059 1 day ago	1-39102 1 day
28488	euprunin author:euprunin	chore(SetTheory): golf entire `cast_succ`, `mk_multiset_of_countable` and `iSup_succ`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory awaiting-author	6/11	Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Finsupp.lean,Mathlib/SetTheory/Ordinal/Family.lean	3	7	['github-actions', 'mathlib4-merge-conflict-bot', 'vihdzp']	nobody	1-23694 1 day ago	2-29649 2 days ago	13-23224 13 days
29833	vlad902 author:vlad902	feat(Set): helper lemmas about set cardinality	A few lemmas I needed in formalizing Dilworth's theorem and vertex covers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	22/0	Mathlib/Data/Set/Card.lean	1	11	['Ruben-VandeVelde', 'github-actions', 'j-loreaux', 'themathqueen', 'vlad902']	nobody	1-21629 1 day ago	1-24257 1 day ago	13-53334 13 days
30141	shalliso author:shalliso	fix(Topology/Baire/Lemmas): fix index type in isMeagre_iUnion	The index set ι needs to be of type Sort* instead of type Type* in isMeagre_iUnion otherwise I get the following message when I try to use it: typeclass instance problem is stuck, it is often due to metavariables Countable ?m.27 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	1/1	Mathlib/Topology/GDelta/Basic.lean	1	1	['github-actions']	nobody	1-18571 1 day ago	1-18584 1 day ago	1-18619 1 day
30071	Jlh18 author:Jlh18	feat: dualize Pseudofunctor.CoGrothendieck results to Pseudofunctor.Grothendieck	Continuing from #29681, dualize all definitions and lemmas in the namespace `Pseudofunctor.CoGrothendieck` to results in the namespace `Pseudofunctor.Grothendieck`. - [ ] depends on: #29681 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	121/9	Mathlib/CategoryTheory/Bicategory/Grothendieck.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-16632 1 day ago	2-24994 2 days ago	2-35500 2 days
30140	chrisflav author:chrisflav	feat(AlgebraicGeometry): locally directed colimits in `P.Over ⊤ S`	We lift the colimit properties of `Scheme` to `P.Over ⊤ S` if `IsLocalAtSource P`. In particular, `P.Over ⊤ S` has pushouts along open immersions and (small) coproducts. We also add two instances, that make ``` example [IsLocalAtSource P] {U X Y : Scheme.{u}} (f : U ⟶ X) (g : U ⟶ Y) [IsOpenImmersion f] [IsOpenImmersion g] : HasPushout f g := inferInstance ``` work. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	164/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/LimitsOver.lean,Mathlib/CategoryTheory/Limits/MorphismProperty.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean	5	1	['github-actions']	nobody	1-16470 1 day ago	1-19768 1 day ago	1-19746 1 day
30142	shalliso author:shalliso	feat(Topology/Baire): define IsNonMeagre	non-meagre sets (also known as "of the second category") are worthy of their own definition and API. This was useful to me for formalizing a result of "automatic continuity", that is, a Baire-measurable homomorphism between Polish groups must be continuous. Simply working with the negation of IsMeagre quickly became cumbersome, and non-meagre sets have an important role in the study of Polish (e.g. locally compact) groups. From https://github.com/shalliso/automatic_continuity [ ] depends on: #30141 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	83/1	Mathlib/Topology/Baire/NonMeagre.lean,Mathlib/Topology/GDelta/Basic.lean	2	1	['github-actions']	nobody	1-16237 1 day ago	1-16239 1 day ago	1-16280 1 day
30143	Jlh18 author:Jlh18	feat(CategoryTheory/Adjunction/PartialAdjunction): add symm naturality lemmas for HomEquiv and lift functor	Add two lemmas for `partialRightAdjointHomEquiv` to help work with `partialRightAdjointHomEquiv.symm`. Add a definition `Functor.PartialRightAdjointSource.lift` to help with defining functors into the category `PartialRightAdjointSource`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	369/0	3,Mathlib/CategoryTheory/Adjunction/PartialAdjoint.lean	2	1	['github-actions']	nobody	1-15431 1 day ago	1-15609 1 day ago	1-15650 1 day
30139	janemms author:janemms	feat(Topology/Metrizable): embed a countably separated space inside a space of sequences	Add lemma on metrizability of a compact space with a sequence of continuous functions to metric spaces separating points on it. This result is needed for proving the sequential Banach-Alaoglu theorem, which is to be pull requested next. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	236/0	Mathlib.lean,Mathlib/Topology/Metrizable/CountableSeparating.lean	2	2	['github-actions', 'themathqueen']	nobody	1-14752 1 day ago	1-21488 1 day ago	1-21524 1 day
30030	JonBannon author:JonBannon	feat(MeasureTheory): add `MemLp.Const` class and instances to unify `p = ∞` and `μ.IsFiniteMeasure` cases	Although it is possible to ensure that, for example, the `One` instances for `p=∞` and `μ.IsFiniteMeasure` are defeq, introducing an `MemLp.Const` typeclass removes the need to unfold extensively to check this definitional equality, improving performance. cf. https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Lp.20constant.20function.20issue/with/537563137 This PR introduces the requisite class and associated instances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	85/55	Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Indicator.lean	6	13	['JonBannon', 'github-actions', 'j-loreaux']	nobody	1-13375 1 day ago	4-6182 4 days ago	6-12638 6 days
30079	dagurtomas author:dagurtomas	feat(CategoryTheory): IsSheafFor as a multiequalizer condition	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory WIP	112/0	Mathlib/CategoryTheory/Sites/Multifork.lean	1	3	['chrisflav', 'github-actions', 'joelriou']	nobody	1-12401 1 day ago	3-77549 3 days ago	0-1 1 second
27262	Timeroot author:Timeroot	feat(Tactic/Bound): bound? for proof scripts	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	24/9	Mathlib/Tactic/Bound.lean	1	10	['JovanGerb', 'Timeroot', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot']	nobody	1-8709 1 day ago	1-8709 1 day ago	69-47369 69 days
29728	ADA-Projects author:ADA-Projects	feat(Topology/KrullDimension): add subspace dimension inequality	This PR extends topological Krull dimension theory with basic results about subspaces. - Add mapIrreducibleClosed function for canonical maps between irreducible closed sets - Prove injectivity and strict monotonicity of these maps - Establish partial order structure on IrreducibleCloseds - Prove topKrullDim_subspace_le theorem showing dim(Y) ≤ dim(X) for subspaces Update (per reviewer feedback): Reorganized code structure as requested: - Moved `IrreducibleCloseds` extensions from `KrullDimension.lean` to `Sets/Closeds.lean` - This includes `PartialOrder` instance, `map` functions, and embedding lemmas - Better modularity: other files can now use `IrreducibleCloseds` without importing Krull dimension theory The main result `topologicalKrullDim_subspace_le` remains the same - any subspace Y has dim(Y) ≤ dim(X). Some sections of this code (and documentation) were generated with the help of Gemini. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	146/20	Mathlib/Topology/KrullDimension.lean,Mathlib/Topology/Sets/Closeds.lean	2	9	['ADA-Projects', 'fpvandoorn', 'github-actions', 'kim-em']	PatrickMassot assignee:PatrickMassot	1-5861 1 day ago	8-61701 8 days ago	8-78421 8 days
29743	loefflerd author:loefflerd	feat(Topology/Algebra): discrete iff finite index subgroup discrete	Show that if G is a topological group and H is a finite-index subgroup, then H is discrete iff G is. --- - [x] depends on: #29648 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	153/9	Mathlib.lean,Mathlib/Data/Set/Constructions.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Algebra/IsUniformGroup/DiscreteSubgroup.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/DiscreteSubset.lean	6	8	['Ruben-VandeVelde', 'github-actions', 'loefflerd', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	j-loreaux assignee:j-loreaux	1-5860 1 day ago	8-41775 8 days ago	10-82107 10 days
29954	kckennylau author:kckennylau	feat(RingTheory): an algebra that is an invertible module is isomorphic to the base ring	This PR considers the case where we have an `R`-algebra `A` which is also an invertible `R`-module, then constructs an isomorphism between `R` and `A` as `R`-algebras: ```lean variable (R A : Type*) [CommSemiring R] [Semiring A] [Algebra R A] [Module.Invertible R A] def algEquivOfRing : R ≃ₐ[R] A := ``` --- Zulip: https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/an.20algebra.20that.20is.20module-invertible.20is.20the.20base.20ring/with/541351797 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	90/0	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/RingTheory/PicardGroup.lean	2	1	['github-actions']	ocfnash assignee:ocfnash	1-5856 1 day ago	8-42227 8 days ago	9-1813 9 days
29957	urkud author:urkud	feat(NormedSpace/Alternating/Uncurry/Fin): new file	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	231/32	Mathlib.lean,Mathlib/Analysis/NormedSpace/Alternating/Uncurry/Fin.lean,Mathlib/LinearAlgebra/Alternating/Uncurry/Fin.lean	3	12	['PatrickMassot', 'github-actions', 'urkud']	hrmacbeth assignee:hrmacbeth	1-5855 1 day ago	8-75710 8 days ago	8-75745 8 days
29964	Vierkantor author:Vierkantor	feat(TacticAnalysis): check if we are in a `try`/`anyGoals` context	This PR adds a check if the tactic is being run in a `try` or `anyGoals` call, so that we do not add a warning for the original tactic failing in this context. This was the source of a few "original tactic failed" in the `grind` regression reports. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	71/31	Mathlib/Tactic/TacticAnalysis.lean,Mathlib/Tactic/TacticAnalysis/Declarations.lean,MathlibTest/TacticAnalysis.lean	3	1	['github-actions']	adamtopaz assignee:adamtopaz	1-5854 1 day ago	8-64650 8 days ago	8-64629 8 days
29967	kim-em author:kim-em	chore: fix longest pole utilities, and verify in CI	We should consider outright deleting these. The fact that they were broken is good evidence they haven't been used recently. Sebastian also has a good replacement available (that is aware of the module system), although I'm not sure it's deployed yet.	CI	26/22	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,LongestPole/Main.lean,LongestPole/Unused.lean	6	2	['bryangingechen', 'github-actions']	bryangingechen assignee:bryangingechen	1-5853 1 day ago	8-55855 8 days ago	8-55892 8 days
29976	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Topology/Semicontinuous): lower bounds on compact sets	Prove that lower semicontinuous functions attain their lower bound on nonempty compact sets, and the analogous lemma for upper semicontinuous functions. By the way, add several basic results for semicontinuous functions, relating the WithinAt, At, On versions. Co-authored with @ADedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		300/1	Mathlib/Order/Filter/Extr.lean,Mathlib/Topology/Semicontinuous.lean	2	1	['github-actions']	TwoFX assignee:TwoFX	1-5851 1 day ago	8-25216 8 days ago	8-25193 8 days
30138	fgdorais author:fgdorais	chore: adaptations for batteries#1441	--- After [batteries#1441](https://github.com/leanprover-community/batteries/pull/1441) is merged: - [ ] Edit the lakefile to point to `leanprover-community/batteries:main` - [ ] Run `lake update batteries` - [ ] Merge `leanprover-community/mathlib4:master` - [ ] Wait for CI and merge [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-batt-PR	18/34	Mathlib/Data/Nat/Bitwise.lean,Mathlib/SetTheory/Nimber/Basic.lean,lake-manifest.json,lakefile.lean	4	1	['github-actions']	nobody	1-4873 1 day ago	1-21280 1 day ago	0-31 31 seconds
29866	euprunin author:euprunin	chore(Topology/ContinuousMap): golf 30 lines from `exists_add_nnrealPart_add_eq` using `grind`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	1/31	Mathlib/Topology/ContinuousMap/CompactlySupported.lean	1	5	['JovanGerb', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	j-loreaux assignee:j-loreaux	1-1692 1 day ago	1-1692 1 day ago	11-30512 11 days
26219	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory/KrullDimension): Krull Dimension of quotient regular sequence	We show that if M is a finite module over a Noetherian local ring R, [r₁, …, rₙ] is an M-sequence, then dim M⧸(r₁, …, rₙ)M + n = dim M. Co-authored-by: Yongle Hu @mbkybky --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	225/15	Mathlib.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Support.lean	9	n/a	['Thmoas-Guan', 'chrisflav', 'github-actions', 'leanprover-community-bot-assistant', 'mbkybky']	chrisflav assignee:chrisflav	1-1685 1 day ago	unknown	unknown
26210	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): associated primes of localized module	We prove that `Ass(S^{-1}M)` is equal to the preimage of `Ass(M)` under `Ideal.comap` if the base ring is Noetherian. From this we conclude that every minimal prime over `Module.annihilator R M` is in `Ass(M)` when `M` is finitely generated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import awaiting-author	85/22	Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Depth.lean	2	30	['Thmoas-Guan', 'chrisflav', 'github-actions', 'mathlib4-merge-conflict-bot', 'mbkybky']	chrisflav assignee:chrisflav	1-1633 1 day ago	38-85779 1 month ago	36-71207 36 days
28599	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory) : polynomial over CM ring is CM	polynomial over Cohen Macaulay ring is Cohen Macaulay --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import WIP	2577/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Polynomial.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/Support.lean	21	n/a	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	1-1269 1 day ago	unknown	unknown
28241	alreadydone author:alreadydone	chore(Data): `SetLike Finset`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	56/65	Counterexamples/AharoniKorman.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/Algebra/Squarefree/Basic.lean,Mathlib/Combinatorics/Additive/RuzsaCovering.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkCounting.lean,Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/Finset/Attach.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Insert.lean,Mathlib/Data/Finset/Union.lean,Mathlib/FieldTheory/Finite/GaloisField.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/GroupTheory/Perm/Centralizer.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Supported.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/Order/CountableDenseLinearOrder.lean,Mathlib/Probability/Independence/Kernel.lean,Mathlib/RingTheory/Ideal/Quotient/Index.lean,Mathlib/RingTheory/IntegralClosure/IsIntegral/Basic.lean,Mathlib/RingTheory/Spectrum/Prime/Polynomial.lean,Mathlib/Topology/Separation/Basic.lean	27	5	['alreadydone', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot']	nobody	1-927 1 day ago	1-927 1 day ago	33-74299 33 days
28682	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): definition of regular local ring	In this PR, we give the definition of regular local ring. The class `IsRegularLocalRing` is defined as `(maximalIdeal R).spanFinrank = ringKrullDim R` We also established the lemma `IsRegularLocalRing.iff_finrank_cotangentSpace` proving this definition is equivalent to the cotangent space version. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	117/0	Mathlib.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean	2	35	['Thmoas-Guan', 'chrisflav', 'github-actions', 'mbkybky']	chrisflav assignee:chrisflav	1-652 1 day ago	42-75056 1 month ago	1-63449 1 day
29558	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): definition of global dimension	In this PR, we define projective dimension and global dimension using `CategoryTheory.HasProjectiveDimensionLT` --- - [ ] depends on: #29882 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	212/0	Mathlib.lean,Mathlib/RingTheory/GlobalDimension.lean	2	7	['Thmoas-Guan', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	erdOne assignee:erdOne	0-85892 23 hours ago	9-49989 9 days ago	10-52245 10 days
30148	mbkybky author:mbkybky	chore(RingTheory/Spectrum/Prime/Module): golf `stableUnderSpecialization_support` using `mem_support_mono`	Golf [Module.stableUnderSpecialization_support](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Spectrum/Prime/Module.html#Module.stableUnderSpecialization_support) using [Module.mem_support_mono](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Support.html#Module.mem_support_mono). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	2/6	Mathlib/RingTheory/Spectrum/Prime/Module.lean	1	1	['github-actions']	nobody	0-83547 23 hours ago	0-83560 23 hours ago	0-83596 23 hours
28484	euprunin author:euprunin	chore(Data): golf entire `toReal_eq_toReal`, `count_eq_of_nodup` and `smul_mat_cons`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data maintainer-merge	6/11	Mathlib/Data/ENNReal/Real.lean,Mathlib/Data/List/Nodup.lean,Mathlib/LinearAlgebra/Matrix/Notation.lean	3	11	['bryangingechen', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot', 'pechersky', 'qawbecrdtey']	pechersky assignee:pechersky	0-79060 21 hours ago	1-2951 1 day ago	48-78658 48 days
30003	vlad902 author:vlad902	feat(Order): helper lemmas for `IsChain`/`IsAntichain`	These were useful in formalizing Dilworth's theorem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	16/0	Mathlib/Order/Antichain.lean,Mathlib/Order/Preorder/Chain.lean	2	6	['github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'vlad902']	nobody	0-73318 20 hours ago	0-73347 20 hours ago	7-29690 7 days
29835	vlad902 author:vlad902	feat(Order): add `IsMaxAntichain` and some lemmas for `IsMaxChain`	Define `IsMaxAntichain` to be the antichain analogue of `IsMaxChain` and add some useful lemmas to both that I needed for proving Mirsky's theorem. - [ ] depends on: #29834 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	51/0	Mathlib/Order/Antichain.lean,Mathlib/Order/Preorder/Chain.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-72855 20 hours ago	1-22555 1 day ago	1-22882 1 day
30136	vlad902 author:vlad902	feat(SimpleGraph): lemmas characterizing graphs that are not complete/empty	Two helper lemmas that I've found useful in several other PRs that characterize graphs that are neither complete nor empty. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	8/0	Mathlib/Combinatorics/SimpleGraph/Basic.lean	1	1	['github-actions']	nobody	0-72081 20 hours ago	1-25172 1 day ago	1-25209 1 day
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	8	['alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot', 'pechersky', 'smmercuri']	alreadydone assignee:alreadydone	0-70289 19 hours ago	39-85290 1 month ago	73-51564 73 days
30059	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Mathlib/Algebra/QuadraticAlgebra): norm, star structure on quadratic alg.	Define the norm and the star structure on a quadratic algebra. Application to the units and the zero divisors. The file `Mathlib.Algebra.QuadraticAlgebra.lean` has been renamed to `Mathlib.Algebra.QuadraticAlgebra/Defs.lean`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	416/1	Mathlib.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/QuadraticAlgebra.lean,Mathlib/Algebra/QuadraticAlgebra/Basic.lean	4	29	['AntoineChambert-Loir', 'eric-wieser', 'github-actions', 'j-loreaux']	riccardobrasca assignee:riccardobrasca	0-69069 19 hours ago	1-12408 1 day ago	5-4168 5 days
30069	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): add lemma `IsTree.dist_ne_of_adj` and necessary lemmas	This contribution was created as part of the Utrecht Summerschool "Formalizing Mathematics in Lean" in July 2025. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	34/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	7	['github-actions', 'themathqueen', 'vlad902']	nobody	0-65953 18 hours ago	4-39048 4 days ago	4-44800 4 days
30103	kebekus author:kebekus	feat: first main theorem of value distribution theory	Establish the first main theorem of value distribution theory in full. This PR completes a major milestone in [Project VD](https://github.com/kebekus/ProjectVD), which aims to formalize Value Distribution Theory for meromorphic functions on the complex plane. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis awaiting-author	71/7	Mathlib/Analysis/Complex/ValueDistribution/FirstMainTheorem.lean,docs/overview.yaml	2	6	['github-actions', 'grunweg', 'kebekus', 'sgouezel']	nobody	0-62948 17 hours ago	0-63245 17 hours ago	2-8406 2 days
30023	jeremypparker author:jeremypparker	feat(Analysis/Fourier): Parseval for FourierCoeffOn	`tsum_sq_fourierCoeffOn` proved via the existing `tsum_sq_fourierCoeff`. The lemmas I needed, particularly `memLp_liftIoc_of_memLp` which shows that the lift of an Lp function on the interval is Lp on AddCircle, turned out to be much messier than I anticipated. Hopefully someone can suggest improvements. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author	91/14	Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Topology/Instances/AddCircle/Defs.lean	2	6	['github-actions', 'j-loreaux', 'jeremypparker']	j-loreaux assignee:j-loreaux	0-62317 17 hours ago	1-16920 1 day ago	5-40103 5 days
30120	FernandoChu author:FernandoChu	feat(CategoryTheory): Pullback of equalizer is an equalizer	We show that the pullback of an equalizer (seen as a subobject) along some morphism `h` is the subobject that comes from the equalizer of the two original arrows precomposed with `h`. A `TODO` was completed in the process. This is a prerequisite of the [MTT project](https://github.com/kyoDralliam/model-theory-topos), which aims to use the internal language of toposes to reason about e.g. sheaves.	large-import t-category-theory	112/2	Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/PullbackCone.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Limits.lean	5	3	['FernandoChu', 'github-actions', 'joelriou']	nobody	0-59246 16 hours ago	0-59246 16 hours ago	0-64885 18 hours
30152	YaelDillies author:YaelDillies	feat(Filter): a finite set is eventually a subset of any exhaustion	This will be used to prove a sort of compactness result for finite minors of a graph. From the ProofBench workshop --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	4/0	Mathlib/Order/Filter/Finite.lean	1	2	['github-actions', 'kckennylau']	nobody	0-58511 16 hours ago	0-68569 19 hours ago	0-68564 19 hours
30113	vlad902 author:vlad902	feat(Order): generalize `Finset.exists_maximalFor` to transitive orders	Currently `exists_maximalFor` and it's related analogs are only defined for Preorders. I generalize the results where it is possible to do so to transitive relations without requiring reflexivity. This was necessary for work where I needed to work with < and find maximums. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	23/5	Mathlib/Order/Basic.lean,Mathlib/Order/Preorder/Finite.lean	2	4	['YaelDillies', 'github-actions', 'vlad902']	nobody	0-58311 16 hours ago	2-44440 2 days ago	2-44478 2 days
30158	nicolaviolette author:nicolaviolette	feat: combinatorics simplegraph basic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	9/4	Mathlib/Combinatorics/SimpleGraph/Basic.lean	1	1	['github-actions']	nobody	0-57995 16 hours ago	0-58003 16 hours ago	0-58038 16 hours
30111	sgouezel author:sgouezel	feat: composing a continuous multilinear map with continuous linear maps is analytic in both variables	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-analysis	133/0	Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean	2	15	['github-actions', 'loefflerd', 'sgouezel']	nobody	0-57599 15 hours ago	0-57599 15 hours ago	1-767 1 day
30155	grunweg author:grunweg	chore(Lean/Elab/Term): reduce import to match file name	This file only requires importing Lean.Elab.Term, and it's good practice anyway for the file name and only import to match. Discovering in #26221. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta easy	1/1	Mathlib/Lean/Elab/Term.lean	1	1	['github-actions']	nobody	0-57344 15 hours ago	0-57344 15 hours ago	0-57323 15 hours
30121	idontgetoutmuch author:idontgetoutmuch	Principal fiber bundle core	A structure capturing what it means to be a principal fibre bundle. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-differential-geometry	227/0	Mathlib.lean,Mathlib/Geometry/Manifold/PrincipalFiberBundle/PrincipalGBundle.lean	2	5	['github-actions', 'grunweg']	nobody	0-56943 15 hours ago	0-69917 19 hours ago	1-62870 1 day
30034	yonggyuchoimath author:yonggyuchoimath	feat(Mathlib/AlgebraicGeometry/AffineScheme): add preservation of limits of affine schemes	This PR adds simple results about affine schemes. Main changes: * `forgetToSchemeCreatesLimits`: The forgetful functor `AffineScheme ⥤ Scheme` creates small limits. * `forgetToSchemeCreatesColimits`: The dual statement * (written by @erdOne) `preservesLimit_rightOp_Γ`: Shows that `Scheme.Γ.rightOp : Scheme ⥤ CommRingCatᵒᵖ` preserves limits of diagrams consisting of affine schemes. * `preservesColimit_Γ`: The dual statement. This PR reopens #30015, which was acidentally closed by myself. --- - [ ] depends on: #30014		33/0	Mathlib/AlgebraicGeometry/AffineScheme.lean	1	16	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'yonggyuchoimath']	nobody	0-54325 15 hours ago	5-38174 5 days ago	5-47765 5 days
30149	NotWearingPants author:NotWearingPants	feat(Combinatorics/SimpleGraph/Hamiltonian): `p.support.get` and `p.getVert` define equivalences with `Fin`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	38/2	Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Data/List/NodupEquivFin.lean	3	1	['github-actions']	nobody	0-54119 15 hours ago	0-82426 22 hours ago	0-82411 22 hours
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	160/8	Mathlib.lean,Mathlib/Probability/Kernel/Composition/Comp.lean,Mathlib/Probability/Kernel/Composition/CompMap.lean,Mathlib/Probability/Kernel/Irreducible.lean,docs/references.bib	5	6	['RemyDegenne', 'bwangpj', 'github-actions']	RemyDegenne assignee:RemyDegenne	0-51790 14 hours ago	10-40948 10 days ago	16-79986 16 days
30156	grunweg author:grunweg	chore(Lean/Expr/Basic): move material about rewriting to a new file	These methods should go into Lean.Meta.Tactic.Rewrite instead, so move them to a new file. I credit Kim, Kyle and Patrick from #3801 for this; Kim's final clean-up eventually introduced these methods. With this moved, the imports for Lean.Expr.Basic can be reduced to just Lean.Expr, which we do. Noticed during work on #26221. ------- I expect this to not pass CI right away yet, e.g. the linarith imports might need fixing. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta easy	48/25	Mathlib.lean,Mathlib/Lean/Expr/Basic.lean,Mathlib/Lean/Meta/Tactic/Rewrite.lean,Mathlib/Order/Defs/PartialOrder.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/DeprecateTo.lean,Mathlib/Tactic/Linarith/Preprocessing.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,MathlibTest/Lint.lean	9	1	['github-actions']	nobody	0-51442 14 hours ago	0-51442 14 hours ago	0-51431 14 hours
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 been partially reviewed by `fpvandoorn` (in person). It has been tested in the branch in #26221 (uncovering minor issues, but not substantial ones --- the worst of which have been fixed). 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. From the path towards geodesics and the Levi-Civita connection. 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	1360/1	Mathlib.lean,Mathlib/Geometry/Manifold/Elaborators.lean,Mathlib/Geometry/Manifold/Traces.lean,Mathlib/Lean/Elab/Term.lean,Mathlib/Lean/Expr/Basic.lean,MathlibTest/DifferentialGeometry/Elaborators.lean,scripts/noshake.json	7	35	['adamtopaz', 'github-actions', 'grunweg', 'sgouezel']	robertylewis assignee:robertylewis	0-50261 13 hours ago	3-61027 3 days ago	83-14260 83 days
27443	yuanyi-350 author:yuanyi-350	doc: Stacks tags	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis label:t-algebra$	6/3	Mathlib/Analysis/NormedSpace/HahnBanach/Separation.lean,Mathlib/RingTheory/Adjoin/Tower.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/Noetherian/Basic.lean	4	9	['YaelDillies', 'github-actions', 'kbuzzard', 'kckennylau', 'mathlib4-merge-conflict-bot', 'yuanyi-350']	nobody	0-49206 13 hours ago	0-59549 16 hours ago	0-60828 16 hours
27465	erdOne author:erdOne	feat: the definition of nonarchimedean local fields	--- - [x] depends on: #27430 - [x] depends on: #27412 - [x] depends on: #27213 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-number-theory	214/25	Mathlib.lean,Mathlib/NumberTheory/LocalField/Basic.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	5	61	['erdOne', 'faenuccio', 'github-actions', 'kbuzzard', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky', 'riccardobrasca']	tb65536 assignee:tb65536	0-48809 13 hours ago	1-58099 1 day ago	14-69165 14 days
29447	j-loreaux author:j-loreaux	chore(Analysis/NormedSpace/HahnBanach): move and split files	This moves or splits the files in `Analysis/NormedSpace/HahnBanach/` accordingly: - `Separation` → `Analysis/LocallyConvex/Separation` - `Extension` → `Analysis/Normed/Module/HahnBanach/Extension` - `SeparatingDual`: split, mostly in `Analysis/LocallyConvex/SeparatingDual`, but a few completeness results are sent to `Analysis/Normed/Module/HahnBanach/Completeness`. The split allows us to significantly reduce the imports of `SeparatingDual`, albeit with a new proof that a normed space over `RCLike 𝕜` has a separating dual. Here we use the geometric Hahn-Banach theorem instead of the analytic one. This is part of #28698 to migrate the material in `Analysis/NormedSpace/` to other locations. --- - [ ] depends on: #29445 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed	102/77	Counterexamples/Phillips.lean,Mathlib.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/Analysis/Convex/Cone/Dual.lean,Mathlib/Analysis/Convex/KreinMilman.lean,Mathlib/Analysis/LocallyConvex/SeparatingDual.lean,Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/Normed/Module/HahnBanach/Completeness.lean,Mathlib/Analysis/Normed/Module/HahnBanach/Extension.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Integral/Bochner/ContinuousLinearMap.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean	17	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-47954 13 hours ago	0-48790 13 hours ago	2-28301 2 days
30163	NotWearingPants author:NotWearingPants	feat(Data/Set/Lattice): useful equivalences of `biUnion` and `biInter`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	25/0	Mathlib/Data/Set/Lattice.lean	1	1	['github-actions']	nobody	0-47109 13 hours ago	0-47109 13 hours ago	0-47160 13 hours
30165	j-loreaux author:j-loreaux	chore(Analysis/NormedSpace/Extend): deprecate module	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-analysis easy	4/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/Extend.lean	2	1	['github-actions']	nobody	0-46532 12 hours ago	0-46554 12 hours ago	0-46587 12 hours
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$	117/0	Mathlib.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Flat/Basic.lean,Mathlib/RingTheory/Nilpotent/Defs.lean,Mathlib/RingTheory/Nilpotent/GeometricallyReduced.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	6	72	['dleijnse', 'github-actions', 'joelriou', 'kckennylau']	joelriou assignee:joelriou	0-46214 12 hours ago	0-46251 12 hours ago	67-58063 67 days
26588	faenuccio author:faenuccio	feat(Algebra/GroupWithZero/WithZero): add the multiplicative embedding with zero from the range	We extend the embedding of the range of a `MonoidWithZeroHom` to the codomain by enriching it with the structure of an ordered, multiplicative embedding. In passing, we extend some results about the embedding of `WithZero` of the units of a group with zero, to the group itself. Co-authored by: María Inés de Frutos Fernández @mariainesdff --- - [x] depends on: #29594 - [x] depends on: #29644 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra label:t-algebra$	111/3	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean	4	74	['YaelDillies', 'eric-wieser', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	YaelDillies assignee:YaelDillies	0-45722 12 hours ago	10-31940 10 days ago	29-81217 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	45/5	Mathlib/NumberTheory/ArithmeticFunction.lean	1	13	['MichaelStollBayreuth', 'NotWearingPants', 'b-mehta', 'eric-wieser', 'github-actions', 'sun123zxy']	MichaelStollBayreuth assignee:MichaelStollBayreuth	0-45174 12 hours ago	44-79422 1 month ago	44-80385 44 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 maintainer-merge	192/1	Mathlib.lean,Mathlib/Analysis/Convex/StdSimplex.lean,Mathlib/LinearAlgebra/Finsupp/Pi.lean,Mathlib/Topology/Algebra/Monoid/FunOnFinite.lean	4	6	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	YaelDillies assignee:YaelDillies	0-44829 12 hours ago	0-67101 18 hours ago	34-38735 34 days
30159	joelriou author:joelriou	chore: make Opposite.small an instance	If `X` is small, so is `Xᵒᵖ`. It no longer seems to be dangerous to have such an instance. (Which shall be convenient for #30160.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-category-theory easy	2/3	Mathlib/Data/Opposite.lean	1	5	['github-actions', 'joelriou', 'leanprover-bot']	nobody	0-44680 12 hours ago	0-44680 12 hours ago	0-44659 12 hours
29116	scholzhannah author:scholzhannah	chore(Topology/PartialHomeomorph): add module deprecation	This is the follow-up PR of #29113 adding the deprecated module after the file was renamed. --- - [ ] depends on: #29113 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated	4/0	Mathlib.lean,Mathlib/Topology/PartialHomeomorph.lean	2	13	['fpvandoorn', 'github-actions', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-44503 12 hours ago	0-45320 12 hours ago	0-2683 44 minutes
30167	RemyDegenne author:RemyDegenne	feat: Fernique's theorem for Gaussian distributions	For a Gaussian measure on a second-countable normed space, there exists `C > 0` such that the function `x ↦ exp (C * ‖x‖ ^ 2)` is integrable. As a consequence, a Gaussian measure in a second-countable Banach space has finite moments of all orders. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	275/0	Mathlib.lean,Mathlib/Probability/Distributions/Gaussian/Basic.lean,Mathlib/Probability/Distributions/Gaussian/Fernique.lean,docs/1000.yaml	4	2	['RemyDegenne', 'github-actions']	nobody	0-44293 12 hours ago	0-44323 12 hours ago	0-44363 12 hours
27414	staroperator author:staroperator	feat(ModelTheory): Semilinear sets in `ℕ ^ k` are closed under intersection and complement	Separated from #27100. This PR proves that semilinear sets in `ℕ ^ k` are closed under intersection, complement and set difference. We will soon generalize them in #27789. --- - [x] depends on: #27082 - [x] depends on: #27086 - [x] depends on: #27088 - [x] depends on: #27096 - [x] depends on: #27342 - [x] depends on: #28670 - [x] depends on: #29032 - [x] depends on: #29749 - [x] depends on: #29784 - [x] depends on: #29793 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic awaiting-author	628/4	Mathlib.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Defs.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Nat.lean	3	10	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'staroperator']	fpvandoorn assignee:fpvandoorn	0-43741 12 hours ago	0-58627 16 hours ago	10-71159 10 days
30122	xroblot author:xroblot	Development branch (1)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import WIP	1696/87	Mathlib.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean,Mathlib/KroneckerWeber_Blueprint.lean,Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/Misc.lean,Mathlib/NumberTheory/Cyclotomic/Basic.lean,Mathlib/NumberTheory/Cyclotomic/Rat.lean,Mathlib/NumberTheory/NumberField/Discriminant/Different.lean,Mathlib/Riccardo.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/DedekindDomain/LinearDisjoint.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/Ideal/GoingUp.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Trace/Basic.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean,Mathlib/Stickelberger.lean	24	1	['github-actions']	nobody	0-43484 12 hours ago	0-43681 12 hours ago	0-12 12 seconds
30154	YaelDillies author:YaelDillies	chore(Order/Filter/Finite): clean up	`protected alias` works now. Also write a module doc. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-order easy	4/11	Mathlib/Order/Filter/Finite.lean	1	2	['Ruben-VandeVelde', 'github-actions']	nobody	0-43313 12 hours ago	0-43313 12 hours ago	0-62133 17 hours
29759	NotWearingPants author:NotWearingPants	feat(Analysis/SpecificLimits/Fibonacci): prove that the ratio of consecutive Fibonacci numbers tends to the golden ratio	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge new-contributor t-analysis	36/0	Mathlib.lean,Mathlib/Analysis/SpecificLimits/Fibonacci.lean	2	7	['NotWearingPants', 'Ruben-VandeVelde', 'github-actions', 'kckennylau']	nobody	0-42952 11 hours ago	0-42953 11 hours ago	8-11929 8 days
30147	NotWearingPants author:NotWearingPants	feat(NumberTheory/ArithmeticFunction): add some lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-number-theory	23/1	Mathlib/NumberTheory/ArithmeticFunction.lean	1	2	['github-actions', 'kckennylau']	nobody	0-42343 11 hours ago	1-2477 1 day ago	1-2510 1 day
29960	yonggyuchoimath author:yonggyuchoimath	feat(Algebra/Category/Ring): equalizers of pushout maps of tensor product inclusions	This PR defines a ring map `S →ₗ[R] S ⊗[R] S : s ↦ (s ⊗ₜ[R] 1) - (1 ⊗ₜ[R] s)` for an `R`-algebra `S`, and show that its kernel is exactly (the image of) `R` if `S` is faithfully flat over `R`. Changes: * `TensorProduct.AlgebraTensorModule.distribBaseChange`: Origianlly takes `M` and `N`, where `M` is an `R`-module with an additional instance `IsScalarTower R A M`. This is unnecessary, so I changed the `M` and `N` into `N` and `Q`, now both of which are merely modules over `R`. Main results : * Add compatibility of `Algebra.TensorProduct.includeLeft` (or `Algebra.TensorProduct.includeRight`) with `TensorProduct.AlgebraTensorModule.distribBaseChange` and `LinearMap.lTensor` * Define `Algebra.TensorProduct.includeLeftSubRight`, which is the `R`-linear map `S →ₗ[R] S ⊗[R] S` sending `s : S` to `(s ⊗ₜ[R] 1) - (1 ⊗ₜ[R] s)`. * `Algebra.TensorProduct.exactIncludeLeftSubRight_of_faithfullyFlat`: the pair `algebraMap : R → S` and `includeLeftSubRight R S : S → S ⊗[R] S` is exact if `S` is a faithfully flat `R`-algebra.	new-contributor	229/1	Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/IncludeLeftSubRight.lean	4	3	['erdOne', 'github-actions', 'yonggyuchoimath']	nobody	0-42252 11 hours ago	3-26138 3 days ago	5-60608 5 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	8	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	alreadydone assignee:alreadydone	0-41909 11 hours ago	37-26198 1 month ago	87-11205 87 days
29507	zhuyizheng author:zhuyizheng	feat(MeasureTheory): derivative integrable functions	Part of originally planned #29092. We prove that: * If `f` is monotone on `a..b`, then `f'` is interval integrable on `a..b`. * If `f` has bounded variation on `a..b`, then `f'` is interval integrable on `a..b`. * If `f` is absolutely continuous on `a..b`, then `f'` exists a.e. on `a..b` and is interval integrable on `a..b`. --- - [ ] depends on: #29504 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability	257/1	Mathlib.lean,Mathlib/MeasureTheory/Function/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/DerivIntegrable.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-41723 11 hours ago	1-46429 1 day ago	0-0 0 seconds
28797	xroblot author:xroblot	feat(DedekindDomain/Ideal): `relNorm` of a prime ideal	The relative norm of the maximal ideal `P` above the maximal ideal `p` is equal to `p ^ p.inertiaDeg P`. --- - [x] depends on: #27105 - [x] depends on: #27157 - [x] depends on: #28169 - [x] depends on: #28738 - [x] depends on: #28724 - [x] depends on: #29068 - [x] depends on: #29069 - [x] depends on: #29907	t-ring-theory	166/1	Mathlib/RingTheory/Ideal/GoingUp.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean	3	17	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'riccardobrasca', 'xroblot']	riccardobrasca assignee:riccardobrasca	0-40557 11 hours ago	2-54889 2 days ago	2-62850 2 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 awaiting-author	102/0	Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/Defs.lean,Mathlib/Data/Nat/Factorization/PrimePow.lean	3	8	['Ruben-VandeVelde', 'github-actions']	pechersky assignee:pechersky	0-40373 11 hours ago	0-40373 11 hours ago	46-80571 46 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	6	['MichaelStollBayreuth', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib4-merge-conflict-bot']	j-loreaux assignee:j-loreaux	0-40309 11 hours ago	7-40025 7 days ago	19-23245 19 days
28451	yapudpill author:yapudpill	feat(RingTheory/Noetherian): add `IsNoetherianRing.of_prime`	This PR introduces the first usage of `Ideal.IsOka` introduced in #27200 to prove that if all prime ideals of a `CommRing` are finitely generated then this ring is Noetherian. To do so, we also added the lemma `Ideal.mem_span_range_self`. --- - [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 awaiting-author	100/29	Mathlib.lean,Mathlib/RingTheory/Ideal/Span.lean,Mathlib/RingTheory/Noetherian/OfPrime.lean,docs/references.bib	4	18	['github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'riccardobrasca', 'yapudpill']	riccardobrasca assignee:riccardobrasca	0-39400 10 hours ago	21-25508 21 days ago	6-62492 6 days
30004	luigi-massacci author:luigi-massacci	feat(MeasureTheory/Integral/TestAgainst): integrating BCFs against a finite measure or an L1Loc map as CLMs	This PR merges #29511 and #29748. Create a new file `TestAgainst.lean` with definitions wrapping integration against a finite measure or a locally integrable map as continuous linear maps on bounded continuous functions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability t-analysis	113/1	Mathlib.lean,Mathlib/MeasureTheory/Integral/BoundedContinuousFunction.lean,Mathlib/MeasureTheory/Integral/TestAgainst.lean	3	38	['EtienneC30', 'github-actions', 'j-loreaux', 'luigi-massacci']	EtienneC30 assignee:EtienneC30	0-39388 10 hours ago	0-39569 10 hours ago	6-57920 6 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	0-38492 10 hours ago	44-43051 1 month ago	91-27919 91 days
30170	smmercuri author:smmercuri	feat: `Rat.padicValuation` is surjective	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	13/0	Mathlib/NumberTheory/Padics/PadicNumbers.lean	1	1	['github-actions']	nobody	0-37885 10 hours ago	0-37899 10 hours ago	0-37935 10 hours
29754	or4nge19 author:or4nge19	feat(Combinatorics/Quiver): add strongly connected quivers	Define strongly connected quivers and their components. Add both standard strong connectivity (allowing length-0 paths) and positive-path strong connectivity. Establish basic properties and relationships to weak connectivity via symmetrification. This is part of Perron Frobenius theorem and grounds its characterization/def of Irreducible matrices and Markov chain analysis in subsequent PRs. split from #28728 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	210/5	Mathlib/Combinatorics/Quiver/ConnectedComponent.lean	1	13	['github-actions', 'ocfnash', 'or4nge19']	ocfnash assignee:ocfnash	0-37147 10 hours ago	3-23909 3 days ago	14-4702 14 days
30171	smmercuri author:smmercuri	feat(DedekindDomain/AdicValuation): `le_one` lemmas for `HeightOneSpectrum.valuation` and specialisations to `Rat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	53/0	Mathlib/RingTheory/DedekindDomain/AdicValuation.lean	1	1	['github-actions']	nobody	0-36680 10 hours ago	0-36797 10 hours ago	0-36829 10 hours
30172	b-mehta author:b-mehta	chore(SpecialFunctions/Pow/Real): adjust intCast lemma to use int	The old statement was identical to the natCast one, and did not mention int or intCast at all, so we correct the statement. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis easy	1/1	Mathlib/Analysis/SpecialFunctions/Pow/Real.lean	1	1	['github-actions']	nobody	0-36649 10 hours ago	0-36653 10 hours ago	0-36695 10 hours
29981	mans0954 author:mans0954	feat(Algebra/Polynomial/Degree/SmallDegree): eq_quadratic_of_degree_le_two	Expansion of a polynomial of degree 2. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #30046	t-algebra label:t-algebra$	7/0	Mathlib/RingTheory/Polynomial/SmallDegreeVieta.lean	1	9	['JovanGerb', 'github-actions', 'mans0954', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vihdzp']	nobody	0-36102 10 hours ago	4-35254 4 days ago	7-29491 7 days
29856	mans0954 author:mans0954	feat(Analysis/Normed/Ring/Basic): Add NonUnitalNonAssocSeminormedRing and NonUnitalNonAssocNormedRing	Adds the classes `NonUnitalNonAssocSeminormedRing` and `NonUnitalNonAssocNormedRing` and relaxes the `NonUnitalSeminormedRing` section to `NonUnitalNonAssocSeminormedRing`. Examples of non-unital non-associative normed rings include non-untial JB-algebras and non-unital JB*-algebras. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	110/11	Mathlib/Analysis/Normed/Ring/Basic.lean,MathlibTest/TCSynth.lean	2	1	['github-actions']	ADedecker assignee:ADedecker	0-36044 10 hours ago	12-45819 12 days ago	12-45830 12 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 awaiting-author	334/93	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	0-35977 9 hours ago	unknown	unknown
30070	adomani author:adomani	CI: remove deprecations automatically	This workflow automates the removal of deprecated declarations. The action is currently configured to run once a week to automatically remove all deprecations older than 6 months. This is managed by the `remove_deprecated_decls` action and depends on the two files `Mathlib/Tactic/Linter/CommandRanges.lean` and `Mathlib/Tactic/Linter/FindDeprecations.lean`. The action can be manually triggered and there is the option of passing two dates in `YYYY-MM-DD` format or also the more human "3 months ago", as long as it is a valid input for `date -d`. The lean files take care of identifying the declarations with the deprecated attribute whose `since` field is between the given ranges. Those declarations then get automatically removed and, if there are no errors, the bot creates a PR with the changes. These PRs then go, naturally, through CI, where issues related to having removed the deprecated declarations will be picked up. The bot also posts a comment on Zulip mentioning when the PR has been opened. Co-authored-by: Bryan Gin-ge Chen --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	595/0	.github/workflows/remove_deprecated_decls.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/CommandRanges.lean,Mathlib/Tactic/Linter/FindDeprecations.lean,MathlibTest/FindDeprecations.lean	6	26	['Vierkantor', 'adomani', 'bryangingechen', 'github-actions']	nobody	0-34633 9 hours ago	2-84970 2 days ago	3-27927 3 days
29342	mans0954 author:mans0954	refactor(Analysis/LocallyConvex/AbsConvex): Redefine AbsConvex to use a single ring of scalars	Currently the definition of Absolutely Convex in Mathlib is a little unexpected: ``` def AbsConvex (s : Set E) : Prop := Balanced 𝕜 s ∧ Convex ℝ s ``` At the time this definition was formulated, Mathlib's definition of `Convex` required the scalars to be an `OrderedSemiring` whereas the definition of `Balanced` required the scalars to be a `SeminormedRing`. Mathlib didn't have a concept of a semi-normed ordered ring, so a set was defined as `AbsConvex` if it is balanced over a `SeminormedRing` `𝕜` and convex over `ℝ`. Recently the requirements for the definition of `Convex` have been relaxed (#24392, #20595) so it is now possible to use a single scalar ring in common with the liturature. Previous discussion: - https://github.com/leanprover-community/mathlib4/pull/17029#discussion_r1782249323 - https://github.com/leanprover-community/mathlib4/pull/26345#discussion_r2287535746 --- - [ ] depends on: #29248 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	51/67	Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/AbsConvexOpen.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/Normed/Module/Dual.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	j-loreaux assignee:j-loreaux	0-33266 9 hours ago	1-26284 1 day ago	1-26272 1 day
30174	mcdoll author:mcdoll	feat: The Hölder conjugate of a ENNReal	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	4/0	Mathlib/Data/Real/ConjExponents.lean	1	1	['github-actions']	nobody	0-32710 9 hours ago	0-32710 9 hours ago	0-32765 9 hours
30175	mcdoll author:mcdoll	feat(Analysis/Distribution): A smooth function with compact support is a Schwartz function	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	23/0	Mathlib/Analysis/Distribution/SchwartzSpace.lean	1	1	['github-actions']	nobody	0-32666 9 hours ago	0-32675 9 hours ago	0-32709 9 hours
30176	mcdoll author:mcdoll	feat(Analysis/Distribution): Multiplication of two functions of temperate growth is of temperate growth	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	33/1	Mathlib/Analysis/Distribution/SchwartzSpace.lean	1	1	['github-actions']	nobody	0-32611 9 hours ago	0-32621 9 hours ago	0-32659 9 hours
30161	EtienneC30 author:EtienneC30	feat: currying as a measurable equivalence	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	89/0	Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/MeasureTheory/MeasurableSpace/Embedding.lean	2	1	['github-actions']	nobody	0-32424 9 hours ago	0-52894 14 hours ago	0-52872 14 hours
30178	EtienneC30 author:EtienneC30	feat: preimage of Set.pi by uncurry	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	10/0	Mathlib/Data/Set/Prod.lean,Mathlib/Data/Set/Sigma.lean	2	1	['github-actions']	nobody	0-32223 8 hours ago	0-32375 8 hours ago	0-32353 8 hours
30180	mcdoll author:mcdoll	feat(Analysis/Calculus): add a version of bounding iterated derivatives of compositions with fewer assumptions on differentiability	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	17/3	Mathlib/Analysis/Calculus/ContDiff/Bounds.lean	1	1	['github-actions']	nobody	0-31887 8 hours ago	0-31893 8 hours ago	0-31932 8 hours
25971	joelriou author:joelriou	feat(CategoryTheory): pseudofunctors to Cat	This PR adds convenience lemmas for pseudofunctors to `Cat`, mostly using the `to_app` attribute. The simp set for the `to_app` attribute is extended in order to take into account that in `Cat`, associators and unitors induce identities. --- - [x] depends on: #30134 This PR continues the work from #24384. Original PR: https://github.com/leanprover-community/mathlib4/pull/24384	t-category-theory	170/20	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Cat.lean,Mathlib/CategoryTheory/Bicategory/Grothendieck.lean,Mathlib/CategoryTheory/Bicategory/Strict/Pseudofunctor.lean,Mathlib/Tactic/CategoryTheory/ToApp.lean,MathlibTest/CategoryTheory/ToApp.lean	6	14	['callesonne', 'chrisflav', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'yuma-mizuno']	nobody	0-31079 8 hours ago	1-29424 1 day ago	1-49050 1 day
26014	CBirkbeck author:CBirkbeck	feat: define the Eisenstein Series E2	This PR continues the work from #24822. Original PR: https://github.com/leanprover-community/mathlib4/pull/24822 - [ ] depends on : #27606	t-number-theory	2364/482	Mathlib.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/IntegerCompl.lean,Mathlib/Analysis/Complex/SummableUniformlyOn.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/Geometry/Manifold/VectorBundle/MDifferentiable.lean,Mathlib/Geometry/Manifold/VectorBundle/SmoothSection.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/NumberTheory/EulerProduct/Basic.lean,Mathlib/NumberTheory/IccSums.lean,Mathlib/NumberTheory/LSeries/RiemannZeta.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Defs.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Summable.lean,Mathlib/NumberTheory/TsumDivsorsAntidiagonal.lean,Mathlib/RingTheory/MvPowerSeries/PiTopology.lean,Mathlib/RingTheory/MvPowerSeries/Substitution.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/Constructions.lean,Mathlib/Topology/Algebra/InfiniteSum/Defs.lean,Mathlib/Topology/Algebra/InfiniteSum/Group.lean,Mathlib/Topology/Algebra/InfiniteSum/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/Module.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean,Mathlib/Topology/Algebra/InfiniteSum/Ring.lean,Mathlib/Topology/Algebra/InfiniteSum/SummationFilter.lean,Mathlib/Topology/Algebra/Monoid/Defs.lean,Mathlib/Topology/ContinuousMap/Algebra.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean,Mathlib/Topology/Instances/Matrix.lean,Mathlib/Topology/Instances/NNReal/Lemmas.lean	37	5	['CBirkbeck', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	0-30669 8 hours ago	0-52588 14 hours ago	0-0 0 seconds
29914	loefflerd author:loefflerd	feat(Topology/Algebra/InfiniteSum): generalise to allow summation filters	We introduce a notion of a "summation filter" on a type, which is (a structure wrapper around) a filter on the finsets of that type. Then we can define tsums / tprods "along L" for any summation filter L, giving a formalism that specializes to the existing notion of unconditional summation, but also covers conditional summation on `ℕ` etc. This is implemented using an optional parameter to `HasSum`, `tsum` etc which defaults to the standard unconditional sum, so the vast majority of existing code using unconditional summation will work without change. Co-authored by Chris Birkbeck. --- Alternative take on #29602, using the optional-parameter mechanism. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	967/477	Mathlib.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/Geometry/Manifold/VectorBundle/SmoothSection.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/NumberTheory/EulerProduct/Basic.lean,Mathlib/NumberTheory/TsumDivsorsAntidiagonal.lean,Mathlib/RingTheory/MvPowerSeries/PiTopology.lean,Mathlib/RingTheory/MvPowerSeries/Substitution.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/Constructions.lean,Mathlib/Topology/Algebra/InfiniteSum/Defs.lean,Mathlib/Topology/Algebra/InfiniteSum/Group.lean,Mathlib/Topology/Algebra/InfiniteSum/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/Module.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean,Mathlib/Topology/Algebra/InfiniteSum/Ring.lean,Mathlib/Topology/Algebra/InfiniteSum/SummationFilter.lean,Mathlib/Topology/ContinuousMap/Algebra.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean,Mathlib/Topology/Instances/Matrix.lean,Mathlib/Topology/Instances/NNReal/Lemmas.lean	25	50	['CBirkbeck', 'github-actions', 'kckennylau', 'loefflerd', 'sgouezel']	nobody	0-30445 8 hours ago	0-42380 11 hours ago	5-28335 5 days
29820	wwylele author:wwylele	feat(RingTheory): {Mv}PowerSeries.{le_}{weighted}Order_prod	The big operator version of `{le}_{weighted}Order_mul` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory maintainer-merge	41/0	Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/MvPowerSeries/Order.lean,Mathlib/RingTheory/PowerSeries/Order.lean	3	4	['Ruben-VandeVelde', 'github-actions', 'wwylele']	mattrobball assignee:mattrobball	0-29425 8 hours ago	0-29460 8 hours ago	14-16572 14 days
26282	AntoineChambert-Loir author:AntoineChambert-Loir	feat: a theorem of Jordan on primitive subgroups of the permutation group	A theorem of Jordan on the primitive subgroups of a permutation group: * if it contains a swap, it is equal to the permutation group, * if it contains a 3-cycle, it contains the alternating group. This PR continues the work from #24131. --- - [x] depends on: #26281 - [x] depends on: #26280 - [x] depends on: #26279 Original PR: https://github.com/leanprover-community/mathlib4/pull/24131 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory large-import maintainer-merge	939/137	Mathlib.lean,Mathlib/Data/Set/Card.lean,Mathlib/GroupTheory/GroupAction/FixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/Jordan.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/Primitive.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/SetTheory/Cardinal/Embedding.lean	11	n/a	['AntoineChambert-Loir', 'adomani', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'tb65536']	nobody	0-28192 7 hours ago	unknown	unknown
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	178/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/LocallyGroupoid.lean,Mathlib/CategoryTheory/Core.lean	3	8	['b-mehta', 'github-actions', 'joelriou', 'robin-carlier']	joelriou assignee:joelriou	0-27572 7 hours ago	2-56581 2 days ago	105-16095 105 days
30132	callesonne author:callesonne	feat(Bicategory/Functor/Strict): add `IsStrict` for pseudofunctors	This PR adds the notion of a strict pseudofunctor (the class `IsStrict`), where the coherence isomorphisms are equalities. This will be useful for #25561 where I define the bicategory of groupoids. --- - [x] depends on: #30134 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	56/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean	2	5	['callesonne', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	0-26877 7 hours ago	0-26886 7 hours ago	1-6037 1 day
30047	ooovi author:ooovi	feat(Combinatorics/SimpleGraph): Add `EdgeLabelling`	Add edge labellings for `SimpleGraph` as well as some basic lemmata. --- This is mostly a cleaned up part of @b-mehta's lean4 port of their [formalisation of an exponentially better upper bound on Ramsey numbers ](https://github.com/b-mehta/ExponentialRamsey/). I need these definitions for another project on Ramsey theory. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-combinatorics awaiting-author	229/5	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/EdgeLabelling.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Increment.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Counting.lean	5	14	['b-mehta', 'github-actions', 'ooovi', 'vlad902']	nobody	0-26652 7 hours ago	0-60035 16 hours ago	5-359 5 days
30162	bryangingechen author:bryangingechen	ci(label_new_contributor.yml): only trigger when PR is opened	Currently, this is triggered even when new bots push a commit to a PR (e.g. the pre-commit.ci bot); adding the `types` filter will prevent the `new-contributor` label being added in such cases. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	8/1	.github/workflows/label_new_contributor.yml	1	4	['bryangingechen', 'github-actions', 'pechersky']	nobody	0-25403 7 hours ago	0-48137 13 hours ago	0-48116 13 hours
30137	vlad902 author:vlad902	feat(SimpleGraph): subsingleton/nontrivial helper lemmas	Helper lemmas I found useful in mutliple PRs for dispatching trivial cases. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	22/0	Mathlib/Combinatorics/SimpleGraph/Basic.lean	1	1	['github-actions']	nobody	0-25358 7 hours ago	1-22948 1 day ago	1-22984 1 day
30173	kckennylau author:kckennylau	chore: generalise extensionality lemmas for localization	This PR generalises some extensionality lemmas for morphisms from localization. The codomains are generalised from `CommMonoid` to `Monoid`, and from `CommSemiring` to `Semiring`. Then two new extensionality lemmas for algebra morphisms are added. Currently `Submonoid.LocalizationMap.epic_of_localizationMap` says that if `M` and `P` are commutative monoids, and `f : M →* N` is a localization map for a submonoid `S`, then two monoid homs `j k : N →* P` are equal if they are equal after composing with `f`. This PR relaxes the assumption on `P` from `CommMonoid` to `Monoid`. Similar generalisations are made in other places, and then two new lemmas for `AlgHom` are added. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	37/18	Mathlib/Algebra/Category/Ring/Instances.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean	5	1	['github-actions']	nobody	0-25142 6 hours ago	0-34241 9 hours ago	0-34227 9 hours
29705	llllvvuu author:llllvvuu	feat(LinearAlgebra/Matrix): formula for charpoly of an inverse matrix	Co-authored-by: Aristotle Harmonic --- - [x] depends on: #29709 to re-organized some imports [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	14/0	Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean	1	7	['github-actions', 'llllvvuu', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen']	Vierkantor assignee:Vierkantor	0-24025 6 hours ago	8-38653 8 days ago	8-48210 8 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 awaiting-author	717/0	Mathlib.lean,Mathlib/Dynamics/SymbolicDynamics/Basic.lean	2	62	['Sfgangloff', 'eric-wieser', 'github-actions', 'kckennylau', 'sgouezel']	sgouezel assignee:sgouezel	0-23745 6 hours ago	1-65208 1 day ago	33-71082 33 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	152/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Probability/Distributions/Beta.lean	3	49	['EtienneC30', 'RemyDegenne', 'TOMILO87', 'github-actions']	EtienneC30 assignee:EtienneC30	0-19176 5 hours ago	9-63661 9 days ago	70-6733 70 days
29284	Jlh18 author:Jlh18	feat(CategoryTheory): naturality lemmas for Core construction	Lemmas for PR #29283 to prove that `Core` is the right adjoint to the forgetful functor from `Cat` to `Grpd`. These lemmas are more general than that setting, and need not be stated in the bundled format. - [ ] depends on: #29250 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	62/0	Mathlib/CategoryTheory/Core.lean	1	14	['Jlh18', 'adomani', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-18996 5 hours ago	0-18996 5 hours ago	14-32817 14 days
29033	faenuccio author:faenuccio	feat(Analysis.LocallyConvex): a linear map is surjective iff its image contains a ball, or a closed ball, or a sphere	Prove that a linear map is surjective if and only if its image contains either a ball or a sphere. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis awaiting-author	104/7	Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Analysis/Normed/Operator/Basic.lean	3	23	['ADedecker', 'eric-wieser', 'faenuccio', 'github-actions', 'j-loreaux', 'yuanyi-350']	nobody	0-18961 5 hours ago	0-18961 5 hours ago	0-75134 20 hours
30181	alreadydone author:alreadydone	feat(Data/Nat): reducible strong recursion	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	43/25	Mathlib/Data/Int/GCD.lean,Mathlib/Data/Nat/Init.lean	2	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	0-18838 5 hours ago	0-18847 5 hours ago	0-24897 6 hours
29979	jano-wol author:jano-wol	feat: invariant dual submodules define Lie ideals	Invariant dual submodules define Lie ideals --- PR shows that Invariant dual submodules define Lie ideals. This work is part of the framework: https://github.com/orgs/leanprover-community/projects/17 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	425/166	Mathlib.lean,Mathlib/Algebra/Lie/Weights/IsSimple.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Lemmas.lean	4	7	['github-actions', 'jano-wol', 'ocfnash']	ocfnash assignee:ocfnash	0-18832 5 hours ago	0-21033 5 hours ago	2-60752 2 days
30182	urkud author:urkud	feat(Calculus): derivative of `ContinuousMultilinearMap.compContinuousLinearMap`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	137/0	Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousMultilinearMap.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean	3	1	['github-actions']	nobody	0-18476 5 hours ago	0-18484 5 hours ago	0-18521 5 hours
29795	Jlh18 author:Jlh18	refactor: weaken HasPullbacks to HasPullback in Over.Pullback	Add an abbreviation `HasPullbackAlong f` to mean that all maps into the codomain of `f` have pullbacks along `f`. As discussed in zulip [#mathlib4 > Hom.HasPullback](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Hom.2EHasPullback/with/541055666) The `HasPullbacks` instance on a category `C` for defining the pullback functor along a map `f : X -> Y` between their over categories can be weakened to just a `HasPullbackAlong` condition on `f`. Dually, for `HasPushout` and undercategories. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory	31/14	Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/HasPullback.lean	2	22	['Jlh18', 'chrisflav', 'github-actions', 'kckennylau', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'peabrainiac']	kim-em assignee:kim-em	0-18442 5 hours ago	0-18465 5 hours ago	14-45572 14 days
29004	euprunin author:euprunin	chore: change from `:= by rfl` to `:= rfl`	For `@[simp]` lemmas this makes them usable by `dsimp`; others are stylistic cleanup (but they're now "`dsimp`-ready" if tagged later). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		138/242	Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/Group/AddChar.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/GroupWithZero/ProdHom.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/ShortComplex/LeftHomology.lean,Mathlib/Algebra/Homology/Single.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Order/Hom/MonoidWithZero.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Derivation.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Algebra/Vertex/HVertexOperator.lean,Mathlib/Algebra/Vertex/VertexOperator.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/Analysis/Asymptotics/ExpGrowth.lean,Mathlib/Analysis/CStarAlgebra/GelfandDuality.lean,Mathlib/Analysis/Calculus/FDeriv/Prod.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/Normed/Module/Span.lean,Mathlib/Analysis/SpecialFunctions/Complex/CircleAddChar.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/CategoryTheory/Closed/Monoidal.lean,Mathlib/CategoryTheory/Distributive/Monoidal.lean,Mathlib/CategoryTheory/Limits/Presheaf.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Cospan.lean,Mathlib/CategoryTheory/Monoidal/Comon_.lean,Mathlib/CategoryTheory/Monoidal/Mod_.lean,Mathlib/CategoryTheory/Yoneda.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/Data/Nat/Factorization/PrimePow.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/PFunctor/Multivariate/Basic.lean,Mathlib/Data/Real/Embedding.lean,Mathlib/Data/Rel.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/Data/Set/Pairwise/Lattice.lean,Mathlib/Data/Subtype.lean,Mathlib/Geometry/Manifold/Bordism.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/GroupTheory/SpecificGroups/Quaternion.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean,Mathlib/LinearAlgebra/Dual/Defs.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Defs.lean,Mathlib/LinearAlgebra/Multilinear/TensorProduct.lean,Mathlib/LinearAlgebra/Projectivization/Action.lean,Mathlib/LinearAlgebra/RootSystem/Hom.lean,Mathlib/LinearAlgebra/RootSystem/Reduced.lean,Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Pi.lean,Mathlib/MeasureTheory/MeasurableSpace/Embedding.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/NumberTheory/FLT/Polynomial.lean,Mathlib/NumberTheory/FactorisationProperties.lean,Mathlib/NumberTheory/Harmonic/ZetaAsymp.lean,Mathlib/NumberTheory/Padics/WithVal.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Functoriality.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/SetTheory/Surreal/Basic.lean,Mathlib/SetTheory/ZFC/Class.lean,Mathlib/Tactic/Module.lean,Mathlib/Tactic/NormNum/PowMod.lean,Mathlib/Topology/Algebra/Algebra/Equiv.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,Mathlib/Topology/Category/Profinite/Nobeling/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling/ZeroLimit.lean,Mathlib/Topology/Category/TopCat/Opens.lean,Mathlib/Topology/ContinuousMap/Units.lean,Mathlib/Topology/LocallyFinsupp.lean,Mathlib/Topology/PartitionOfUnity.lean,Mathlib/Topology/Sets/Closeds.lean	95	21	['eric-wieser', 'euprunin', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	TwoFX assignee:TwoFX	0-18261 5 hours ago	0-18284 5 hours ago	10-4551 10 days
27918	kim-em author:kim-em	wip: refactor WithBot/WithTop as structures	For now we are still relying on `WithBot` and `WithTop` being defeq, but there is no impossible obstacle to converting them both to the same structure. This PR begins this effort; the modified files are all compiling, but there are more files that still have problems. Help on this (either ask to push to my branch, PR to my branch, or just adopt the whole thing!) very much appreciated.	file-removed	955/354	Mathlib.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Monoid/ToMulBot.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/BoxIntegral/Partition/SubboxInduction.lean,Mathlib/Analysis/Meromorphic/Order.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Data/Countable/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENat/Defs.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Finset/WithBot.lean,Mathlib/Data/Fintype/WithTopBot.lean,Mathlib/Data/List/MinMax.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Ordmap/Invariants.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/Sum/Order.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/Logic/Embedding/WithBot.lean,Mathlib/Logic/Equiv/WithBot.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Real.lean,Mathlib/MeasureTheory/Group/Measure.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/Order/Category/BddLat.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Hom/WithTopBot.lean,Mathlib/Order/Interval/Basic.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/Interval/Set/WithBotTop.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/Set.lean,Mathlib/Order/SuccPred/Basic.lean,Mathlib/Order/TypeTags.lean,Mathlib/Order/WithBot/Basic.lean,Mathlib/Order/WithBot/BooleanAlgebra.lean,Mathlib/Order/WithBot/NAry.lean,Mathlib/RingTheory/UniqueFactorizationDomain/FactorSet.lean,Mathlib/SetTheory/Cardinal/ENat.lean,Mathlib/Topology/Algebra/Ring/Real.lean,Mathlib/Topology/Category/LightProfinite/Sequence.lean,Mathlib/Topology/Compactification/OnePoint/Basic.lean,Mathlib/Topology/Instances/ENat.lean,MathlibTest/lift.lean	56	11	['eric-wieser', 'github-actions', 'kim-em', 'mathlib4-merge-conflict-bot']	nobody	0-18119 5 hours ago	1-66788 1 day ago	48-77812 48 days
29279	Jlh18 author:Jlh18	feat: free groupoid on a category, free-forgetful adjunction	- define `CategoryTheory.Category.FreeGroupoid` in a file of the same name - show the universal property of this construction, as the initial category localizing all maps in the category. These are the defs `of`, `lift`, and their related theorems - Show that this construction is functorial `CategoryTheory.Category.FreeGroupoid.map` - Convert this to a functor `CategoryTheory.Category.Grpd.free` from `Cat` to `Grpd`, and show that it is left adjoint to the forgetful functor - `CategoryTheory.Grpd.freeForgetAdjunction` - [ ] depends on: #29278 - [ ] depends on: #30115 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory	236/1	Mathlib.lean,Mathlib/CategoryTheory/Category/FreeGroupoid.lean,Mathlib/CategoryTheory/Groupoid/FreeGroupoid.lean	3	10	['Jlh18', 'MichaelStollBayreuth', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-17686 4 hours ago	0-18660 5 hours ago	11-18706 11 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 ready-to-merge delegated	189/7	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	1	16	['bryangingechen', 'github-actions', 'jcommelin', 'joelriou', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'robin-carlier']	mattrobball assignee:mattrobball	0-17004 4 hours ago	0-17004 4 hours ago	106-27684 106 days
30183	NotWearingPants author:NotWearingPants	chore(Algebra/BigOperators): move factorial theorem to `Data/Nat/Factorial/BigOperators`	--- I think it makes sense to place it next to similar theorems about `ascFactorial` and `descFactorial`, but I've left the original because it's tagged `@[simp]`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor	9/6	Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Data/Nat/Factorial/BigOperators.lean	2	1	['github-actions']	nobody	0-14524 4 hours ago	0-18070 5 hours ago	0-18117 5 hours
27844	CBirkbeck author:CBirkbeck	Add q-expansion identities for Eisenstein series.	This is PR contains some q-expansion identities that are needed to give the q-expansions of Eisenstein series, which will be added as part of #27606. --- - [x] depends on: #27212 - [x] depends on: #27837 - [x] depends on: #27839 - [x] depends on: #27840 - [x] depends on: #27841 - [x] depends on: #26016 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-number-theory	257/0	Mathlib.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/SummableUniformlyOn.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/NumberTheory/LSeries/RiemannZeta.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Defs.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean	7	44	['CBirkbeck', 'MichaelStollBayreuth', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-13233 3 hours ago	0-24822 6 hours ago	0-59336 16 hours
29936	ineol author:ineol	fix(LinearAlgebra/AffineSpace/Simplex): update `setInterior` docstring	The coefficients range over the parameter `I`, not the open interval `(0,1)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	1/2	Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean	1	2	['github-actions', 'joelriou']	joelriou assignee:joelriou	0-12588 3 hours ago	0-34698 9 hours ago	9-24700 9 days
27053	tb65536 author:tb65536	(WIP) Galois group of `x^n - x - 1`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra WIP label:t-algebra$	377/7	Mathlib/RingTheory/Polynomial/Selmer.lean	1	3	['AntoineChambert-Loir', 'github-actions']	nobody	0-10255 2 hours ago	83-8763 2 months ago	0-1 1 second
30150	imbrem author:imbrem	feat(CategoryTheory/Monoidal): to_additive for MonoidalCategory	Added `AddMonoidalCategory`, the additive version of `MonoidalCategory`. --- As discussed in #28718; I added an `AddMonoidalCategory` struct and tagged `MonoidalCategory` with `to_additive`, along with the lemmas in `Category.lean`. To get this to work, I needed to _remove_ the `to_additive` attributes in `Discrete.lean`, since otherwise the instances and lemmas within would be ill-typed (as MonoidalCategory would be replaced with AddMonoidalCategory). We simply implement the additive variants by hand instead. I think this is the right approach, since under this framework the "correct" additive version of `Discrete.lean` would be mapping an `AddMonoid` to an `AddMonoidalCategory`. Next steps would be to: - Make `monoidal_coherence` and `coherence` support `AddMonoidalCategory` - Add `CocartesianMonoidalCategory` extending `AddMonoidalCategory` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor	408/126	Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/Tactic/ToAdditive/GuessName.lean	3	5	['JovanGerb', 'YaelDillies', 'github-actions', 'imbrem']	nobody	0-8867 2 hours ago	0-81284 22 hours ago	0-81321 22 hours
27273	xroblot author:xroblot	feat(IntermediateField/LinearDisjoint): Two fields are linearly disjoint iff they are disjoint in the Galois case	--- - [x] depends on: #26841	t-algebra label:t-algebra$	73/1	Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/FieldTheory/LinearDisjoint.lean	3	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	mattrobball assignee:mattrobball	0-5869 1 hour ago	7-60567 7 days ago	7-62177 7 days
23181	YaelDillies author:YaelDillies	refactor(Topology/UniformSpace): use `SetRel`	What's left in `UniformSpace.Defs` is precisely the theory of the uniformity filter. The motivation is that the theory of coverings and packings in both high dimensional probability and dynamics can be based on entourages, while they have little to do with the uniformity filter (indeed, entourages are in a sense a quantitative version of the uniformity filter). --- - [x] depends on: #25587 - [x] depends on: #26988 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	660/618	Mathlib/Data/Rel.lean,Mathlib/Dynamics/TopologicalEntropy/CoverEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Dynamics/TopologicalEntropy/NetEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/Semiconj.lean,Mathlib/Dynamics/TopologicalEntropy/Subset.lean,Mathlib/InformationTheory/Hamming.lean,Mathlib/MeasureTheory/Measure/RegularityCompacts.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/MetricSpace/PiNat.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/UniformSpace/Ascoli.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Cauchy.lean,Mathlib/Topology/UniformSpace/Compact.lean,Mathlib/Topology/UniformSpace/CompactConvergence.lean,Mathlib/Topology/UniformSpace/Completion.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/DiscreteUniformity.lean,Mathlib/Topology/UniformSpace/Equicontinuity.lean,Mathlib/Topology/UniformSpace/HeineCantor.lean,Mathlib/Topology/UniformSpace/OfCompactT2.lean,Mathlib/Topology/UniformSpace/OfFun.lean,Mathlib/Topology/UniformSpace/Separation.lean,Mathlib/Topology/UniformSpace/Ultra/Basic.lean,Mathlib/Topology/UniformSpace/Ultra/Completion.lean,Mathlib/Topology/UniformSpace/Ultra/Constructions.lean,Mathlib/Topology/UniformSpace/UniformApproximation.lean,Mathlib/Topology/UniformSpace/UniformConvergence.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	30	35	['ADedecker', 'PatrickMassot', 'YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	ADedecker assignee:ADedecker	0-5869 1 hour ago	7-45650 7 days ago	83-22169 83 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']	pechersky assignee:pechersky	0-5868 1 hour ago	29-28704 29 days ago	45-3930 45 days
28582	Thmoas-Guan author:Thmoas-Guan	feat(Data): some lemmas about WithBot ENat	Add some lemma about withBot ENat discovered when dealing with `ringKrullDim` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	25/0	Mathlib/Data/ENat/Basic.lean	1	5	['Ruben-VandeVelde', 'Thmoas-Guan', 'github-actions']	pechersky assignee:pechersky	0-5867 1 hour ago	10-62275 10 days ago	35-39745 35 days
29356	Paul-Lez author:Paul-Lez	feat(Mathlib/FieldTheory/RatFunc/Basic): add characteristic instances for `RatFunc`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	63/17	Mathlib.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Field.lean,Mathlib/Algebra/Algebra/IsSimpleRing.lean,Mathlib/Algebra/CharP/Algebra.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/FieldTheory/Differential/Liouville.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Finite/GaloisField.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean	11	8	['Paul-Lez', 'eric-wieser', 'github-actions']	kim-em assignee:kim-em	0-5866 1 hour ago	29-15711 29 days ago	29-15741 29 days
29463	HugLycan author:HugLycan	feat(Positivity): add positivity extensions for `NNReal.rpow` and `ENNReal.rpow`	--- This PR adds positivity extensions for `NNReal.rpow` and `ENNReal.rpow`. related issue #6038 @fpvandoorn [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	70/3	Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,MathlibTest/positivity.lean	2	10	['HugLycan', 'fpvandoorn', 'github-actions', 'grunweg']	hrmacbeth assignee:hrmacbeth	0-5865 1 hour ago	7-43622 7 days ago	7-45302 7 days
29863	FernandoChu author:FernandoChu	feat(CategoryTheory): Colimits in `Subobject X`	Adds colimits to `Subobject X`. Together with https://github.com/leanprover-community/mathlib4/pull/29253, this will show existence of lubs in the poset of subobjects. This is a prerequisite of the [MTT project](https://github.com/kyoDralliam/model-theory-topos), which aims to use the internal language of toposes to reason about e.g. sheaves.	t-category-theory	71/0	Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	riccardobrasca assignee:riccardobrasca	0-5864 1 hour ago	7-67536 7 days ago	12-34705 12 days
29896	themathqueen author:themathqueen	chore(LinearAlgebra/Matrix/PosDef): deprecate `PosSemidef.sqrt` in favour of `CFC`	We deprecate `PosSemidef.sqrt` and all related results in favour of using more general results (i.e., `CFC.sqrt` and results in C*-algebras). This also defines the partial order and `StarOrderedRing` instances on matrices. This also moves all results related to `PosSemidef.sqrt` to `Analysis/Matrix/Order` to minimize imports. The partial order instance on matrices is scoped to `MatrixOrder` (analogous to `ComplexOrder`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed large-import	295/278	Mathlib.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/Matrix/Order.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,MathlibTest/PosDef.lean	7	49	['github-actions', 'j-loreaux', 'loefflerd', 'mathlib4-merge-conflict-bot', 'themathqueen']	tb65536 assignee:tb65536	0-5863 1 hour ago	7-44691 7 days ago	9-7573 9 days
29916	themathqueen author:themathqueen	chore: move some results from `Analysis/Normed/Algebra/Spectrum` to `Analysis/{Real, Complex}/Spectrum`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	130/74	Mathlib.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/Complex/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Real/Spectrum.lean	5	4	['Ruben-VandeVelde', 'github-actions', 'mathlib4-merge-conflict-bot', 'themathqueen']	ADedecker assignee:ADedecker	0-5862 1 hour ago	7-38533 7 days ago	10-28154 10 days
29924	pelicanhere author:pelicanhere	feat(RingTheory): local properties of semilocal rings	Proves local properties of semilocal rings, which wiil be used in Iwasawa theory. For a natural language proof, see [lean-iwasawa](https://acmepjz.github.io/lean-iwasawa/blueprint/sect0002.html#a0000000013) (slightly different from this PR). > > > > [![Open in Gitpod](https://camo.githubusercontent.com/b04f5659467d23b5109ba935a40c00decd264eea25c22d50a118021349eea94f/68747470733a2f2f676974706f642e696f2f627574746f6e2f6f70656e2d696e2d676974706f642e737667)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	183/6	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/PID.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/LocalProperties/IntegrallyClosed.lean,Mathlib/RingTheory/LocalProperties/Semilocal.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean	6	45	['github-actions', 'kckennylau', 'pelicanhere']	chrisflav assignee:chrisflav	0-5862 1 hour ago	9-82727 9 days ago	9-82767 9 days
29969	smmercuri author:smmercuri	refactor: use isometry extensions for completions at infinite places of number fields	The API for `InfinitePlace.Completion` currently makes use of abstract results defined on absolute values, which all depend on the hypothesis of the form `∀ x, ‖f x‖ = v x`. This is equivalent to `f` being an isometry, and so many of these results can be bypassed and deprecated by using `Isometry.completion_extension` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		72/47	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Completion.lean,Mathlib/Topology/MetricSpace/Completion.lean	4	1	['github-actions']	RemyDegenne assignee:RemyDegenne	0-5861 1 hour ago	8-37491 8 days ago	8-37476 8 days
29982	hrmacbeth author:hrmacbeth	feat: new `isolate` tactic	This PR adds a new tactic, `isolate`, which "solves for x" in an equation or relation. For example: ```lean example (a b : ℝ) (f : ℝ → ℝ) : 5 * f a - 3 < b := by isolate f a -- new goal: `⊢ f a < (b + 3) / 5` ``` The `isolate` tactic may generate side goals, if these are necessary to justify the transformation. The tactic will attempt to justify such side goals using `positivity` (as in the above example), unification, or type class inference, but if unsuccessful will present them to the user. For example: ```lean example (a b c : ℝ) (f : ℝ → ℝ) : c * f a - 3 < b := by isolate f a -- new goal: `⊢ f a < (b + 3) / c` -- second (side) new goal: `⊢ 0 < c` ``` The `isolate` tactic is extensible. Coverage may be extended to new relations and new operations-to-be-undone by tagging appropriate lemmas with the new `@[isolate]` attribute. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta	863/3	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Isolate.lean,Mathlib/Tactic/Isolate/Core.lean,Mathlib/Tactic/Isolate/Tagging.lean,Mathlib/Tactic/Relation/Symm.lean,MathlibTest/Isolate/Heavyweight.lean,MathlibTest/Isolate/Lightweight.lean,scripts/noshake.json	12	23	['JovanGerb', 'PatrickMassot', 'github-actions', 'hrmacbeth', 'kim-em']	JovanGerb assignee:JovanGerb	0-5860 1 hour ago	7-18003 7 days ago	7-17987 7 days
29988	pechersky author:pechersky	chore(RingTheory/PrimitiveRoots): switch argument for `isUnit` from `0 < k` to `k ≠ 0`	Did not do this for all lemmas in `IsPrimitiveRoot` namespace which is still heterogeneous between - `NeZero k` - `0 < k` - `k ≠ 0` Note: there will always be some mismatch in hypotheses, because core has lemmas about divisibility in `0 < k` hypothesis form On the way to describing the torsion subgroup, as requested in #29517 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	26/26	Mathlib/FieldTheory/KummerExtension.lean,Mathlib/NumberTheory/Cyclotomic/CyclotomicCharacter.lean,Mathlib/NumberTheory/Cyclotomic/Rat.lean,Mathlib/NumberTheory/MulChar/Lemmas.lean,Mathlib/RingTheory/Frobenius.lean,Mathlib/RingTheory/RootsOfUnity/EnoughRootsOfUnity.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean	7	4	['Ruben-VandeVelde', 'github-actions']	riccardobrasca assignee:riccardobrasca	0-5859 1 hour ago	7-78536 7 days ago	7-78610 7 days
29999	jeremypparker author:jeremypparker	chore(Analysis/Fourier/AddCircle): remove stale comment	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	0/1	Mathlib/Analysis/Fourier/AddCircle.lean	1	2	['Ruben-VandeVelde', 'github-actions', 'jeremypparker']	sgouezel assignee:sgouezel	0-5858 1 hour ago	7-61006 7 days ago	7-61040 7 days
30000	themathqueen author:themathqueen	refactor(Analysis/InnerProductSpace/Positive): generalize definition to use `IsSymmetric` instead of `IsSelfAdjoint` and `CompleteSpace`	The definition remains the same in complete spaces, but this allows us to use positivity and the partial order without needing completeness. To use the old definition (i.e., `IsSelfAdjoint` and ...), instead of unfolding, use `ContinuousLinearMap.isPositive_def`. `isPositive_iff` is renamed to `isPositive_iff'`, and `isPositive_iff` points to the same thing but with `IsSymmetric` instead of `IsSelfAdjoint`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	64/54	Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/InnerProductSpace/StarOrder.lean	2	3	['github-actions', 'themathqueen']	sgouezel assignee:sgouezel	0-5857 1 hour ago	7-55225 7 days ago	7-60973 7 days
30144	alreadydone author:alreadydone	feat(Data/Nat): reducible binaryRec	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-algebra label:t-algebra$	77/55	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/Data/Nat/BinaryRec.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Size.lean	7	1	['github-actions']	nobody	0-5679 1 hour ago	0-5679 1 hour ago	0-5718 1 hour
29788	robertmaxton42 author:robertmaxton42	feat (Topology): adds bundled continuous maps for sum, sigma, subtype, mapsto, inclusion	Adds a collection of bundled continuous maps and homeomorphisms, and helper lemmas for working with their compositions. Bundling of existing continuity lemmas: * `ContinuousMap.subtypeVal` * `ContinuousMap.inl` and `.inr`; `ContinuousMap.sum` bundles `Continuous.sumElim`; `ContinuousMap.sumMap`, which is a quotient map when both components are quotient maps * `ContinuousMap.sigmaMap`, which is a quotient map when given a family of quotient maps * `ContinuousMap.mapsTo` bundles `ContinuousOn.restrict_mapsTo` New functions: * `ContinuousMap.preimageValIncl : C(s ↓∩ t, t)` and `.inclPreimageVal C(s, t ↓∩ s)`, and their unbundled functions in `Set` * `Homeomorph.Set.preimageVal` witnesses that the two are opposite directions of a homeomorphism * Descending from a coherent set of subspaces is a quotient map The primary use for these bundled maps is easy composition and the ability to introduce them by rewriting right-to-left: it is much more convenient to write `subtypeVal.comp _` than to use either the anonymous constructor (which doesn't work in any position without an expected type) or `ContinuousMap.mk` (which will disappear as soon as it is coerced to a function, making it difficult to use in mixed-categorical contexts where many maps can only be reduced by introducing a composition with some other map.) This PR is part of a family of PRs that ultimately construct transformations in both directions between the concrete `Topology.RelCWComplex` and abstract `TopCat.RelativeCWComplex`. `.mapsTo` in particular bundles together a couple of potentially nontrivial proofs in a way that makes them easy to refer to later; I use it and `.subtypeVal` particularly heavily later in a dependent PR to build the cell inclusion maps on both sides of the equivalence. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	226/3	Mathlib/Data/Set/Subset.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Coherent.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Basic.lean,scripts/noshake.json	7	6	['adamtopaz', 'github-actions', 'robertmaxton42']	adamtopaz assignee:adamtopaz	0-3341 55 minutes ago	0-3361 55 minutes ago	14-85842 14 days
14720	eric-wieser author:eric-wieser	refactor: change `CliffordAlgebra.lift` to use quadratic maps	This works towards addressing a footnote on [page 152](https://eric-wieser.github.io/thesis/eric-wieser-thesis.pdf#page=164) of my thesis. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	200/167	Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Equivs.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Prod.lean,Mathlib/LinearAlgebra/QuadraticForm/Complex.lean,Mathlib/LinearAlgebra/QuadraticForm/Dual.lean,Mathlib/LinearAlgebra/QuadraticForm/Isometry.lean,Mathlib/LinearAlgebra/QuadraticForm/IsometryEquiv.lean,Mathlib/LinearAlgebra/QuadraticForm/Prod.lean,Mathlib/LinearAlgebra/QuadraticForm/QuadraticModuleCat.lean,Mathlib/LinearAlgebra/QuadraticForm/Real.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct/Isometries.lean	11	1	['github-actions']	nobody	429-66286 1 year ago	443-57281 1 year ago	0-0 0 seconds
14426	adomani author:adomani	dev: `#min_imps` command	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	142/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MinImports.lean,test/MinImports.lean	4	2	['adomani', 'github-actions']	nobody	429-66286 1 year ago	442-62667 1 year ago	0-0 0 seconds
14167	alreadydone author:alreadydone	feat: Group scheme structure on Weierstrass curve	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	workshop-AIM-AG-2024 t-algebraic-geometry merge-conflict WIP	727/41	Mathlib.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Scheme.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Universal.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/MvPolynomial/Basic.lean	12	3	['Multramate', 'github-actions', 'jcommelin']	nobody	429-66285 1 year ago	442-53896 1 year ago	0-0 0 seconds
13847	alreadydone author:alreadydone	feat(EllipticCurve): the universal elliptic curve	+ Define the universal Weierstrass curve (`Universal.curve`) over the polynomial ring `ℤ[A₁,A₂,A₃,A₄,A₆]`, and the universal pointed elliptic curve (`Universal.pointedCurve`) over the field of fractions (`Universal.Field`) of the universal ring `ℤ[A₁,A₂,A₃,A₄,A₆,X,Y]/⟨P⟩ = Universal.Poly/⟨P⟩` (`Universal.Ring`, where `P` is the Weierstrass polynomial) with distinguished point `(X,Y)`. + Given a Weierstrass curve `W` over a commutative ring `R`, we define the specialization homomorphism `W.specialize : ℤ[A₁,A₂,A₃,A₄,A₆] →+* R`. If `(x,y)` is a point on the affine plane, we define `W.polyEval x y : Universal.Poly →+* R`, which factors through `W.ringEval x y : Universal.Ring →+* R` if `(x,y)` is on `W`. + Introduce the cusp curve `Y² = X³`, on which lies the rational point `(1,1)`, with the nice property that `ψₙ(1,1) = n`, making it easy to prove nonvanishing of the universal `ψₙ` when `n ≠ 0` by specializing to the cusp curve, which shows that `(X,Y)` is a point of infinite order on the universal pointed elliptic curve. --- - [x] depends on: #13845 - [x] depends on: #12883 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-algebraic-geometry merge-conflict awaiting-author label:t-algebra$	543/208	Mathlib.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Universal.lean	6	4	['Multramate', 'alreadydone', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	429-66285 1 year ago	463-6582 1 year ago	0-0 0 seconds
14036	adomani author:adomani	Test/decl diff in lean	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	465/1040	.github/workflows/Lean_decl_diff.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,.github/workflows/mk_build_yml.sh,scripts/decls_diff_hybrid.sh,scripts/list_decls.lean	8	1	['github-actions']	nobody	429-66285 1 year ago	467-64576 1 year ago	0-0 0 seconds
13297	urkud author:urkud	feat(Semicontinuous): add `comp` lemma	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-topology merge-conflict awaiting-author	31/13	Mathlib/Topology/Semicontinuous.lean	1	3	['sgouezel', 'urkud']	nobody	429-66284 1 year ago	441-44015 1 year ago	0-18175 5 hours
13372	adomani author:adomani	dev: generic replacement	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	446/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ReplaceRefine.lean,Mathlib/Tactic/Replacements.lean	4	4	['adomani', 'github-actions']	nobody	429-66284 1 year ago	471-61193 1 year ago	0-0 0 seconds
13512	adomani author:adomani	test: count all	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	85/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/Tally.lean	4	0	[]	nobody	429-66284 1 year ago	471-61066 1 year ago	0-0 0 seconds
12416	adomani author:adomani	chore: remove some cdots	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	3830/3239	Archive/Imo/Imo1972Q5.lean,Archive/Imo/Imo2006Q5.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2021Q1.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BirthdayProblem.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/Partition.lean,Counterexamples/Cyclotomic105.lean,Counterexamples/DirectSumIsInternal.lean,Mathlib.lean,Mathlib/Algebra/Algebra/Spectrum.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/List/Basic.lean,Mathlib/Algebra/Category/GroupCat/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Images.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/CharP/Quotient.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/DirectLimit.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/GroupPower/Order.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Homology/Exact.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/Triangulated.lean,Mathlib/Algebra/Homology/LocalCohomology.lean,Mathlib/Algebra/Homology/TotalComplex.lean,Mathlib/Algebra/Lie/DirectSum.lean,Mathlib/Algebra/Lie/IdealOperations.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/Weights/Basic.lean,Mathlib/Algebra/Module/DedekindDomain.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LocalizedModule.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/Module/Zlattice/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/MonoidAlgebra/Ideal.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Order/Archimedean.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Int.lean,Mathlib/Algebra/Order/Group/MinMax.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Pointwise.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Algebra/Polynomial/PartialFractions.lean,Mathlib/Algebra/Polynomial/Reverse.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/Algebra/Polynomial/UnitTrinomial.lean,Mathlib/Algebra/Quandle.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/FunctionField.lean,Mathlib/AlgebraicGeometry/Gluing.lean,Mathlib/AlgebraicGeometry/Morphisms/Basic.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiCompact.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiSeparated.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/AlgebraicGeometry/Pullbacks.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SplitSimplicialObject.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Extend.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ApproximatesLinearOn.lean,Mathlib/Analysis/Calculus/LocalExtr/Basic.lean,Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/Analysis/Calculus/TangentCone.lean	608	0	[]	nobody	429-66283 1 year ago	521-68281 1 year ago	0-0 0 seconds
12528	adomani author:adomani	test: autotranslations Bot --> Top	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	350/294	Mathlib.lean,Mathlib/Order/WithBot.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MinMax.lean,test/MinMax.lean	5	0	[]	nobody	429-66283 1 year ago	499-66425 1 year ago	0-0 0 seconds
12679	MichaelStollBayreuth author:MichaelStollBayreuth	perf(NumberTheory/RamificationInertia): speed up slow file	A repetition of the earlier experiment at [#12412](https://github.com/leanprover-community/mathlib4/pull/12412) with Lean 4.8.0-rc1. This time, I tried not to introduce local instances if possible, but instead to tweak instance priorities. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	57/14	Mathlib/NumberTheory/RamificationInertia.lean	1	3	['MichaelStollBayreuth', 'github-actions', 'leanprover-bot']	nobody	429-66283 1 year ago	487-25428 1 year ago	0-0 0 seconds
12933	grunweg author:grunweg	chore: replace some use of > or ≥ by < or ≤	These were flagged by the linter in #12879: it is easy to simple avoid > or ≥ in hypotheses or `have`s. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	123/123	Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q5.lean,Archive/Imo/Imo2019Q4.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Star/CHSH.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Group/ControlledClosure.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Nat/Dist.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/Parity.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/UInt.lean,Mathlib/GroupTheory/Coxeter/Length.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/Rayleigh.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/Tactic/CancelDenoms/Core.lean,Mathlib/Tactic/IntervalCases.lean,Mathlib/Tactic/Linarith/Lemmas.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/NormNum/GCD.lean,Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean,Mathlib/Topology/MetricSpace/CauSeqFilter.lean,Mathlib/Topology/Sequences.lean,test/LibrarySearch/basic.lean,test/Use.lean,test/cancel_denoms.lean,test/linarith.lean,test/norm_cast.lean	64	6	['YaelDillies', 'github-actions', 'grunweg']	nobody	429-66283 1 year ago	442-75874 1 year ago	0-55655 15 hours
12608	eric-wieser author:eric-wieser	feat: allow `nsmul` / `zsmul` to be omitted again, with a warning	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-meta merge-conflict awaiting-author label:t-algebra$	118/2	Mathlib.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/DefaultFieldLinter.lean,scripts/noshake.json,test/default_field_linter.lean	6	12	['YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions']	nobody	429-66283 1 year ago	478-61347 1 year ago	5-72414 5 days
12934	grunweg author:grunweg	chore: replace more uses of > or ≥ by < or ≤	These were flagged by the linter in https://github.com/leanprover-community/mathlib4/pull/12879: it is easy to simple avoid > or ≥ in hypotheses or haves. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author help-wanted	41/42	Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2019Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib/Tactic/Linarith/Datatypes.lean,test/cancel_denoms.lean,test/congr.lean,test/interval_cases.lean,test/observe.lean	15	11	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'jcommelin', 'urkud']	nobody	429-66283 1 year ago	442-75880 1 year ago	1-73101 1 day
12588	adomani author:adomani	remove trailingDegree	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1280/979	Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/TrailingDegree.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/Mirror.lean,Mathlib/Order/WithBot.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MinMax.lean,Mathlib/Tactic/MinMaxTwo.lean,test/MinMax.lean	11	0	[]	nobody	429-66283 1 year ago	517-69859 1 year ago	0-0 0 seconds
12637	adomani author:adomani	translation: MonoidAlgebra to AddMonoidAlgebra	[Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/merge.20Add-MonoidAlgebra) * #12646 was found as a consequence of unification. * #12659 the typo `single 1 1` for `single 0 1`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-meta merge-conflict label:t-algebra$	615/986	Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MinMaxTwo.lean,scripts/noshake.json	7	0	[]	nobody	429-66283 1 year ago	451-46983 1 year ago	0-0 0 seconds
12465	rosborn author:rosborn	style: Change Subtype.val to (↑)	--- This is a test to see replacing `Subtype.val` with `(↑)` where appropriate. After performing the rewrite, some of the types subtly changed in a difficult to detect manner. Before the change, `openEmbedding' _` had type `OpenEmbedding Subtype.val` where `Subtype.val` expanded as `@Subtype.val α fun x ↦ x ∈ U : ↥U → α`. After the change, `Subtype.val` expands to `@Subtype.val α fun x ↦ x ∈ ↑U : { x // x ∈ ↑U } → α`. This caused some later proofs to fail due to the different definition. In a similar case, within the proof of `mfderiv_coe_sphere_injective` on line 553 `Subtype.val` expanded as `@Subtype.val E fun x ↦ x ∈ (Submodule.span ℝ {↑(-v)})ᗮ : ↥(Submodule.span ℝ {↑(-v)})ᗮ → E`. After changing to `(↑)`, it expanded to `@Subtype.val E fun x ↦ x ∈ ↑(Submodule.span ℝ {↑(-v)})ᗮ : { x // x ∈ ↑(Submodule.span ℝ {↑(-v)})ᗮ } → E`. One benefit to using `(↑)` was that it lead to a shorter proof as `ContinuousLinearEquiv.coe_coe` could be removed on line 559. In general, this subtle change in types is basically impossible to detect without a tool like leaff. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	50/50	Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/Normed/Group/Hom.lean,Mathlib/CategoryTheory/Generator.lean,Mathlib/CategoryTheory/Limits/Shapes/Types.lean,Mathlib/CategoryTheory/Subobject/Types.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/GroupTheory/Subsemigroup/Operations.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/Order/Directed.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/Order/RelIso/Set.lean,Mathlib/RingTheory/Artinian.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/PGame.lean,Mathlib/SetTheory/Surreal/Basic.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/Germ.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	28	1	['eric-wieser', 'rosborn']	nobody	429-66283 1 year ago	518-42074 1 year ago	0-0 0 seconds
12936	mattrobball author:mattrobball	chore(Quiver.Opposite): make `Quiver.Hom.op/unop` `abbrev`'s	These are wrappers around the constructor and projection for `Opposite Quiver.Hom _ _`. The projection itself is reducible and with structure eta built in to defeq it seems like we might be making Lean work harder than is necessary. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	39/34	Mathlib/Algebra/Homology/ShortComplex/Homology.lean,Mathlib/Algebra/Homology/ShortComplex/RightHomology.lean,Mathlib/CategoryTheory/Idempotents/Basic.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Sites/CoverLifting.lean,Mathlib/CategoryTheory/Subobject/Comma.lean,Mathlib/CategoryTheory/Triangulated/Opposite.lean,Mathlib/Combinatorics/Quiver/Basic.lean	10	9	['YaelDillies', 'kim-em', 'leanprover-bot', 'mattrobball']	nobody	429-66283 1 year ago	497-32275 1 year ago	0-0 0 seconds
12473	adomani author:adomani	first translations	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	424/265	Mathlib.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/WithBot.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MinMax.lean	5	0	[]	nobody	429-66283 1 year ago	499-66426 1 year ago	0-0 0 seconds
12192	Ruben-VandeVelde author:Ruben-VandeVelde	feat: generalize isLittleO_const_id_atTop/atBot	From PNT+. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict awaiting-author	10/4	Mathlib/Analysis/Asymptotics/Asymptotics.lean	1	6	['Ruben-VandeVelde', 'llllvvuu', 'urkud']	nobody	429-66282 1 year ago	441-44149 1 year ago	1-21749 1 day
11617	urkud author:urkud	refactor(Finset): redefine Finset.diag, review API	Redefine `Finset.diag` using `Finset.map`. The new definition doesn't rely on `DecidableEq` and is much more computationally efficient. Also review API and golf proofs here and there. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict awaiting-author	187/181	Archive/Imo/Imo1998Q2.lean,Mathlib.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Energy.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Increment.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Data/Finset/Diag.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Prod.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/Sym/Card.lean,Mathlib/Data/Sym/Sym2.lean	13	7	['YaelDillies', 'eric-wieser', 'urkud']	nobody	429-66282 1 year ago	552-18012 1 year ago	1-12270 1 day
11100	eric-wieser author:eric-wieser	feat(CategoryTheory/Limits): add `Functor.mapBinaryBiconeInv`	--- - [ ] depends on: #11130 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) It's tempting to try to prove something like ```lean theorem Functor.mapBinaryBiconeInv_toCone [Limits.HasZeroMorphisms C] [Limits.HasZeroMorphisms D] (e : D ⥤ C) [IsEquivalence e] {X Y : D} (b : BinaryBicone (e.obj X) (e.obj Y)) : (e.mapBinaryBiconeInv b).toCone = (e.mapConeInv <\| (Cones.postcompose (pairComp X Y e).symm.hom).obj b.toCone) := by simp sorry theorem Functor.mapBinaryBiconeInv_toCocone [Limits.HasZeroMorphisms C] [Limits.HasZeroMorphisms D] (e : D ⥤ C) [IsEquivalence e] {X Y : D} (b : BinaryBicone (e.obj X) (e.obj Y)) : (e.mapBinaryBiconeInv b).toCocone = (e.mapCoconeInv <\| (Cocones.precompose (pairComp X Y e).hom).obj b.toCocone) := by sorry ``` but maybe equality is evil here	t-category-theory awaiting-CI merge-conflict	52/0	Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Biproducts.lean	3	6	['TwoFX', 'eric-wieser', 'leanprover-community-mathlib4-bot']	nobody	429-66281 1 year ago	451-46983 1 year ago	0-0 0 seconds
10845	Shamrock-Frost author:Shamrock-Frost	Refactor: Make MonoidalFunctor carry the data of an inverse	We change the definition of a strong monoidal functor from a lax monoidal functor for which the unitor and tensorator are `IsIso` to a lax monoidal functor with the data of inverses for the unitor and tensorator. This requires fixing a lot of knock on effects. --- This is a draft PR. I would like to talk with people on zulip before merging it, and plan ahead to when we have oplax/colax monoidal functors as well. I'm not sure the approach I took here where `MonoidalFunctor` inherits from `LaxMonoidalFunctor` is a good choice if we want to be lax/oplax symmetric. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory RFC merge-conflict WIP	3799/1589	Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Homology/HomotopyCategory/DegreewiseSplit.lean,Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Adjunction/Mates.lean,Mathlib/CategoryTheory/Adjunction/Opposites.lean,Mathlib/CategoryTheory/Adjunction/Prod.lean,Mathlib/CategoryTheory/Adjunction/Whiskering.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/Bicategory/SingleObj.lean,Mathlib/CategoryTheory/CatCommSq.lean,Mathlib/CategoryTheory/CatSquares.lean,Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Monoidal/Adjunction.lean,Mathlib/CategoryTheory/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/NaturalTransformation.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Rigid/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Rigid/OfEquivalence.lean,Mathlib/CategoryTheory/Monoidal/Subcategory.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Products/Associator.lean,Mathlib/CategoryTheory/Products/Basic.lean,Mathlib/CategoryTheory/Shift/Basic.lean,Mathlib/CategoryTheory/Shift/Pullback.lean,Mathlib/CategoryTheory/Whiskering.lean,Mathlib/RepresentationTheory/Action/Monoidal.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Rep.lean	41	7	['Shamrock-Frost', 'joelriou']	nobody	429-66281 1 year ago	585-4414 1 year ago	0-0 0 seconds
10594	lecopivo author:lecopivo	feat: `fun_trans` function transformation tactic e.g. for computing derivatives	feat: `fun_trans` function transformation tactic e.g. for computing derivatives Function transformation tactic/simproc. For example it can be used for computing derivatives. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict WIP	1819/56	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Elab.lean,Mathlib/Tactic/FunProp/FunctionData.lean,Mathlib/Tactic/FunProp/MorExt.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunTrans/Attr.lean,Mathlib/Tactic/FunTrans/Core.lean,Mathlib/Tactic/FunTrans/Decl.lean,Mathlib/Tactic/FunTrans/Elab.lean,Mathlib/Tactic/FunTrans/Theorems.lean,Mathlib/Tactic/FunTrans/Types.lean,test/fun_prop2.lean,test/fun_prop_dev.lean,test/fun_trans_dev.lean	17	11	['github-actions']	nobody	429-66281 1 year ago	491-3540 1 year ago	0-0 0 seconds
10721	urkud author:urkud	feat(Order/FunLike): define `PointwiseLE`	- introduce a mixin class `DFunLike.PointwiseLE`, use it to define `DFunLike.instPartialOrder`; - add a generic `DFunLike.orderEmbeddingCoe` - add `DFunLike.PointwiseLE` instances here and there. With this refactor and #13022, I'm going to generalize lemmas like `MeasureTheory.ae_mono` to `OuterMeasureClass`. --- - [x] depends on: #12983 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic t-order merge-conflict	123/50	Mathlib.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/GroupTheory/Congruence.lean,Mathlib/Order/FunLike.lean,Mathlib/Order/Heyting/Hom.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/Bounded.lean,Mathlib/Order/Hom/CompleteLattice.lean,Mathlib/Topology/Order/Hom/Basic.lean	13	48	['YaelDillies', 'dupuisf', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	429-66281 1 year ago	451-46983 1 year ago	64-12826 64 days
10521	eric-wieser author:eric-wieser	chore: generalize `IsBoundedLinearMap` to modules	Most of the lemmas don't actually need the normed on the scalars at all. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict awaiting-author	58/42	Mathlib/Analysis/NormedSpace/BoundedLinearMaps.lean	1	3	['github-actions', 'j-loreaux', 'urkud']	nobody	429-66281 1 year ago	536-80343 1 year ago	1-29105 1 day
10024	ADedecker author:ADedecker	feat: rename `connectedComponentOfOne` to `identityComponent`, prove that it is normal and open	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-CI merge-conflict	58/24	Mathlib/FieldTheory/AbsoluteGaloisGroup.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Group/TopologicalAbelianization.lean,Mathlib/Topology/Algebra/OpenSubgroup.lean,Mathlib/Topology/Connected/Basic.lean	5	0	[]	nobody	429-66281 1 year ago	441-44738 1 year ago	0-832 13 minutes
8582	eric-wieser author:eric-wieser	wip	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	3/7	Mathlib/Algebra/Category/AlgebraCat/Monoidal.lean,Mathlib/LinearAlgebra/TensorProduct.lean	2	4	['eric-wieser', 'leanprover-bot']	nobody	429-66280 1 year ago	680-53136 1 year ago	0-0 0 seconds
8503	thorimur author:thorimur	feat: meta utils for `refine?`	This PR introduces some metaprogramming infrastructure and utilities that are necessary for `refine?` (#8364). * `elabTermWithHoles'` (and `withCollectingNewGoalsFrom'`): a more configurable version of `elabTermWithHoles`, which allows: preserving the initial mvar type; not tagging untagged goals; and postponing mvars. * Some `Syntax` and `TSyntax` functionality, including: * `TSyntax.map`(`M`), for acting on `TSyntax` with functions `f : Syntax -> (m) Syntax` * Range operations: `includes` and `isEqByRange` * `setTrailingInfoBy?` and `unsetOriginalTrailing`, which is like `unsetTrailing`, but behaves as expected. * `Term.withoutModifyingState`, which does not allow unknown mvarIds to escape via the infotree * `hasNewErrors`, which runs a monad computation and returns the value along with `true` or `false` depending on whether new error messages have been logged * the option `pp.anonymousMVarSuffixes`, which can be set to `false` to replace all numeric suffixes of anonymous mvars with `✝`, which is useful in tandem with `#guard_msgs` for tests (but is essentially a workaround—although it can make some tactic states more legible). --- I'm open to suggestions on the location and name of the option/delaborator used for trimming the numeric suffixes of anonymous mvar names (which is used in the tests)—including whether or not it should exist in the first place, as it's essentially just a workaround. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author	312/5	Mathlib.lean,Mathlib/Lean/CoreM.lean,Mathlib/Lean/Elab/Tactic/ElabTerm.lean,Mathlib/Lean/Elab/Term.lean,Mathlib/Util/Delaborators.lean,Mathlib/Util/Syntax.lean	6	2	['kmill', 'thorimur']	kmill assignee:kmill	429-66280 1 year ago	631-76578 1 year ago	38-46649 38 days
8616	eric-wieser author:eric-wieser	feat(Algebra/FreeAlgebra): add right action and `IsCentralScalar`	--- - [ ] depends on: #8652 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict label:t-algebra$	30/8	Mathlib/Algebra/FreeAlgebra.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	429-66280 1 year ago	451-46983 1 year ago	0-0 0 seconds
8658	eric-wieser author:eric-wieser	feat: support right actions for `Con`	This adds a new `Con.CompatibleSMul` typeclass that captures exactly the condition when `smul` descends to the quotient. I was not quite able to merge this with `MulAction.QuotientAction`: * The imports are such that the congruence relation `QuotientGroup.con` is not yet available in that file * `QuotientGroup.con` requires the subgroup to be normal, while `MulAction.QuotientAction` does not --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	80/18	Mathlib/GroupTheory/Congruence.lean,Mathlib/RingTheory/Congruence.lean	2	6	['YaelDillies', 'eric-wieser']	nobody	429-66280 1 year ago	479-44934 1 year ago	29-65537 29 days
8961	eric-wieser author:eric-wieser	refactor: use the coinduced topology on ULift	--- - [x] depends on: #8958 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI merge-conflict please-adopt awaiting-author	46/14	Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/Constructions.lean	3	6	['eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	429-66280 1 year ago	617-58524 1 year ago	0-0 0 seconds
8788	FMLJohn author:FMLJohn	feat(Algebra/Module/GradeZeroModule): if `A` is a graded semiring and `M` is a graded `A`-module, then each grade of `M` is a module over the 0-th grade of `A`.	--- - [ ] depends on: #8187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	237/4	Mathlib.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Module/GradeZeroModule.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/Noetherian.lean	6	4	['FMLJohn', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	429-66280 1 year ago	463-54182 1 year ago	0-0 0 seconds
9487	eric-wieser author:eric-wieser	feat: the exponential of dual numbers over non-commutative rings	This is a work in progress, as I don't know my way around the measure theory library. --- - [x] depends on: #9489 - [x] depends on: #9486 - [x] depends on: #10427 - [ ] depends on: #10452 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability t-algebra t-analysis merge-conflict WIP label:t-algebra$	97/0	Mathlib/Analysis/NormedSpace/TrivSqZeroExt.lean	1	7	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	429-66280 1 year ago	434-61349 1 year ago	0-0 0 seconds
9564	AntoineChambert-Loir author:AntoineChambert-Loir	weaken commutativity assumptions for AdjoinRoot.lift and AdjoinRoot.liftHom	I weaken a commutativity assumption for docs#AdjoinRoot.liftHom that the target algebra be commutative. It is only assumed to be a Semiring. For that, I need to generalize docs#AdjoinRoot.lift which takes `i : R ->+* S`, `a : S` with `f.eval₂ i a = 0` and defines `AdjoinRoot f ->+* S` that extends `i ` and sends `AdjoinRoot.root f` to `a`. --- The initial version of the PR was to define `AdjoinRoot.lift'` where `S` is only a Semiring, with the additional assumption `hcomm : ∀ r, Commute (i r) a` that the element `a` commutes with the image of `i`. @jcommelin suggested to provide this argument as an `autoParam`, filled in by an ad hoc `commutativity` tactic. However, such an argument cannot be made implicit and a first version required to have this argument given each time, most of the time by `_`, even for all subsequent lemmas, `AdjoinRoot.lift_mk`, etc. To avoid this, I tried to make this assumption a `⦃hcomm : ∀ r, Commute (i r) a⦄`. This appears to have some side effects that proofs using an `exact` tactic or in term mode do not work well, but one can resort on `by simp […]`. Maybe @eric-wieser or @Vierkantor will have opinions on that. In some cases one can still give the argument as `(hcomm := by commutativity)`. (There are 3 options : - separate lemmas for the fully commutative case and for the case where a proof is needed - using the `commutativity` tactic, but with an argument `_` sometimes - using the optional argument.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	146/30	Mathlib.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Commutativity.lean,Mathlib/Tactic/Commutativity/Init.lean	8	14	['AntoineChambert-Loir', 'Vierkantor', 'eric-wieser', 'jcommelin']	nobody	429-66280 1 year ago	451-46983 1 year ago	16-24540 16 days
9504	alreadydone author:alreadydone	chore: remove some IsSeparable assumptions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	41/14	Mathlib/NumberTheory/NumberField/Norm.lean,Mathlib/RingTheory/Norm.lean	2	0	[]	nobody	429-66280 1 year ago	518-41064 1 year ago	0-0 0 seconds
8585	thorimur author:thorimur	chore: bench lean4#2944	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1/1	lean-toolchain	1	2	['leanprover-bot', 'thorimur']	nobody	429-66280 1 year ago	680-71458 1 year ago *	0-0 0 seconds *
9642	eric-wieser author:eric-wieser	refactor(Analysis/Normed/{Group/Field}/Basic): Let `extends` generate the repeated fields	New-style structure shenanigans mean that instance constructors randomly complain about a missing field that can be found with `__ : MetricSpace _ := infer_instance`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) I will write a longer PR description for this once CI is happy	t-analysis merge-conflict awaiting-author WIP help-wanted	122/202	Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Completion.lean,Mathlib/Analysis/Normed/Order/Basic.lean,Mathlib/Analysis/NormedSpace/ProdLp.lean,Mathlib/Analysis/NormedSpace/Star/Matrix.lean,Mathlib/Analysis/NormedSpace/Unitization.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/InformationTheory/Hamming.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean	17	11	['eric-wieser', 'leanprover-bot', 'urkud']	nobody	429-66280 1 year ago	607-46182 1 year ago	0-0 0 seconds
8519	eric-wieser author:eric-wieser	refactor(LinearAlgebra/TensorProduct): golf using `liftAddHom`	This new `TensorProduct.liftAddHom` doesn't require bilinearity, only that scalar multiplication can be moved between the arguments. While in theory we only need the `AddMonoidHom` version as it offers exactly the same generality, we first provide an unbundled `liftFun` as this seems to give a sizeable performance boost if used in downstream `lift` variants. --- - [x] depends on: #8571 - [x] depends on: #8584 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	53/50	Mathlib/Algebra/Category/AlgebraCat/Monoidal.lean,Mathlib/LinearAlgebra/TensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean	3	28	['bustercopley', 'eric-wieser', 'jcommelin', 'jjaassoonn', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib-bors']	nobody	429-66280 1 year ago	578-38595 1 year ago	5-6524 5 days
9356	alexjbest author:alexjbest	feat: assumption?	A little helper for replacing `assumption`s with `exact` statements quickly --- If this is approved I will add tests This begs the question of whether it might simply be better to add some sort of code action for "replace with trythis output" [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author	24/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/TryAssumption.lean	4	5	['alexjbest', 'j-loreaux', 'jcommelin']	nobody	429-66280 1 year ago	613-277 1 year ago	19-26304 19 days
9252	FR-vdash-bot author:FR-vdash-bot	chore: remove redundant covariance instances, add priority	I noticed that the following code is surprisingly slow. ``` lean import Mathlib count_heartbeats in example {n : ℕ} : CovariantClass (Fin (n + 1)) (Fin (n + 1)) (· + ·) (· < ·) := by try infer_instance sorry ``` This PR removed some redundant instances. The heartbeats have dropped from 19118 to 11450 (still too slow). Lean4 still seems to make some redundant attempts. See also https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1691792488. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-order t-algebra merge-conflict awaiting-author WIP label:t-algebra$	40/32	Mathlib/Algebra/CovariantAndContravariant.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/CategoryTheory/Abelian/DiagramLemmas/Four.lean	4	8	['FR-vdash-bot', 'leanprover-bot', 'urkud']	nobody	429-66280 1 year ago	488-23305 1 year ago	0-0 0 seconds
8906	jjaassoonn author:jjaassoonn	feat: add some missing lemmas about linear algebra	--- - [ ] depends on: #8905 [lifting injective modules to higher universe] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	45/1	Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/LinearAlgebra/Basic.lean,Mathlib/LinearAlgebra/BilinearMap.lean	4	21	['AntoineChambert-Loir', 'alreadydone', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	429-66280 1 year ago	531-16009 1 year ago	0-0 0 seconds
9570	eric-wieser author:eric-wieser	feat(Algebra/Star): Non-commutative generalization of `StarModule`	[Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Star.20modules.20over.20non-commutative.20scalars/near/383664005). Until we address #7152, we have to have both `StarModule` and `StarModule'`. To prove this generalization is useful, this shows that with it as an assumption, `TrivSqZeroExt` is a `StarRing`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict WIP label:t-algebra$	66/6	Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/Pi.lean,Mathlib/Algebra/Star/Prod.lean,Mathlib/Algebra/TrivSqZeroExt.lean	4	0	[]	nobody	429-66280 1 year ago	522-56486 1 year ago	0-0 0 seconds
9354	chenyili0818 author:chenyili0818	feat: monotonicity of gradient on convex real-valued functions	This file is based on Mathlib.Analysis.Calculus.Gradient.Basic, and describes the calculation properties co-authored-by: Ziyu Wang [tropicalfish910@gmail.com](mailto:tropicalfish910@gmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict awaiting-author	540/0	Mathlib.lean,Mathlib/Analysis/Convex/ConvexFunction.lean	2	15	['github-actions', 'winstonyin']	nobody	429-66280 1 year ago	560-32969 1 year ago	22-72922 22 days
9482	yuma-mizuno author:yuma-mizuno	refactor(CategoryTheory/Monoidal): add `LaxMonoidalStruct`	Add a `LaxMonoidalStruct` with only the unit morphism `ε` and the tensorator `μ`. This is used in #6307 to provide two different constructors for `LaxMonoidal` that have common `ε` and `μ` but use the tensor of morphisms or the whiskerings. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	21/8	Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/CategoryTheory/Monoidal/Functorial.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean	3	0	[]	nobody	429-66280 1 year ago	617-70129 1 year ago	0-0 0 seconds
9146	laughinggas author:laughinggas	feat(Data/ZMod/Defs): Topological structure on `ZMod`	Added a discrete topology structure to `ZMod n` for all `n` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict awaiting-author label:t-algebra$	55/3	Mathlib.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Instances/ZMod.lean,Mathlib/Topology/Maps.lean	5	61	['YaelDillies', 'eric-wieser', 'github-actions', 'jcommelin', 'laughinggas', 'mo271', 'urkud']	nobody	429-66280 1 year ago	610-74408 1 year ago	7-6153 7 days
9229	eric-wieser author:eric-wieser	refactor(Algebra/GradedMonoid): Use `HMul` to define `GMul`	This make the notation much nicer, but I'm pretty sure this is a bad idea for performance / ambiguity reasons. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	114/125	Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/GradedMulAction.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/LinearAlgebra/TensorAlgebra/ToTensorPower.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean	11	6	['eric-wieser', 'leanprover-bot']	nobody	429-66280 1 year ago	593-55997 1 year ago	0-0 0 seconds
6580	adomani author:adomani	chore: `move_add`-driven replacements	This PR accompanies #6576 and uses `move_add/mul` to simplify/streamline a selection of proofs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	12/13	Counterexamples/Monic_nonRegular.lean,Mathlib/Algebra/Associated.lean,Mathlib/Data/Polynomial/RingDivision.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean	4	0	[]	nobody	429-66279 1 year ago	546-54711 1 year ago	0-0 0 seconds
6630	MohanadAhmed author:MohanadAhmed	feat: Reduced Spectral Theorem	For A hermitian matrix $A : n \times n$ with rank $A.rank \leq n$, we can eliminate the zero eigenvalues and their corresponding eigenvectors from the (alternate) spectral theorem. As such the matrix $A$ can be written as: $$A = V₁ D V₁ᴴ$$ where - $V₁$ : $n \times r$ is the matrix of eigenvector with non-zero associated eigenvalues. - $D$ is $r \times r$ is the diagonal matrix containing only non-zero eigenvalues on its main diagonal. with $r = A.rank$ being the rank of the matrix Towards that goal we make several equivalence definitions: - `{i // hA.eigenvalues i ≠ 0} ≃ Fin (A.rank)` the set of non-zero eigenvalues can be indexed by the numbers from 0 to (r - 1). - `{i // ¬ hA.eigenvalues i ≠ 0} ≃ Fin (n - A.rank)` the set of non-zero eigenvalues can be indexed by the numbers from 0 to (n - r - 1). - `{i // hA.eigenvalues i ≠ 0} ⊕ {i // ¬hA.eigenvalues i ≠ 0} ≃ n`: the index set of the matrix (together with the associated eigenvector matrix and eigenvalues matrix ) can be partitioned into two complement groups the ones corresponding to non-zero eigenvalues and the ones corresponding to zero eigenvalues. - We can then put the previous definitions together to obtain a: `Fin (A.rank) ⊕ Fin (Fintype.card n - A.rank) ≃ n` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	31/0	Mathlib/LinearAlgebra/Matrix/Spectrum.lean	1	0	[]	nobody	429-66279 1 year ago	441-44996 1 year ago	0-0 0 seconds
6930	kmill author:kmill	feat: `resynth_instances` tactic for resynthesizing instances in the goal or local context	This tactic can be useful for debugging non-canonical instances or for fixing up goals and hypotheses after using the `classical` tactic. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict WIP	327/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ResynthInstances.lean,test/ResynthInstances.lean	4	0	[]	nobody	429-66279 1 year ago	760-40302 2 years ago	0-0 0 seconds
6931	urkud author:urkud	refactor(Analysis/Normed): use `RingHomIsometric` for `.norm_cast`	--- I don't understand why linter fails. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict help-wanted	78/68	Mathlib/Analysis/LocallyConvex/ContinuousOfBounded.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/NormedSpace/Basic.lean,Mathlib/Analysis/NormedSpace/Exponential.lean,Mathlib/Analysis/NormedSpace/Spectrum.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean	8	0	[]	nobody	429-66279 1 year ago	451-46983 1 year ago	0-0 0 seconds
7427	MohanadAhmed author:MohanadAhmed	Mohanad ahmed/sort eigenvalues abs	In the file `Analysis.InnerProductSpace.Spectrum` todo notes were left saying: > TODO Postcompose with a permutation so that these eigenvectors are listed in increasing order of eigenvalue. > TODO Postcompose with a permutation so that these eigenvalues are listed in increasing order. - This is a start in that direction --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	162/4	Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/NormedSpace/PiLp.lean,Mathlib/LinearAlgebra/Matrix/Spectrum.lean	3	0	[]	nobody	429-66279 1 year ago	607-6576 1 year ago	0-0 0 seconds
7467	ADedecker author:ADedecker	feat: spectrum of X →ᵇ ℂ is StoneCech X	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict WIP	121/23	Mathlib/Analysis/NormedSpace/Star/BoundedContinuousFunction.lean,Mathlib/Analysis/NormedSpace/Star/GelfandDuality.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean,Mathlib/Topology/ContinuousFunction/Compact.lean	4	1	['github-actions']	nobody	429-66279 1 year ago	591-15291 1 year ago	0-0 0 seconds
7351	shuxuezhuyi author:shuxuezhuyi	feat(Topology/Algebra/Order): extend function on `Ioo` to `Icc`	Extend a strictly monotone function defined on an open interval. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict awaiting-author	59/0	Mathlib.lean,Mathlib/Data/Set/Function.lean,Mathlib/Topology/Algebra/Order/IccExtendFromIoo.lean	3	7	['j-loreaux', 'shuxuezhuyi']	nobody	429-66279 1 year ago	559-29545 1 year ago	30-30522 30 days
7225	jjaassoonn author:jjaassoonn	some random stuff	- Consider two commutative rings `R` and `S` and `X` and `(R, S)`-bimodule. Consider the tensor functor `(X ⊗[R] .)` from the category of `R`-modules to the category of `S`-modules and the hom functor `X →ₗ[S] .` from the category of `S`-modules to the category of `R`-modules, they form an adjunction. - direct limits of modules commute with tensor product - A proof of ![00HD](https://stacks.math.columbia.edu/tag/00HD) Three definitions for flatness: 1. in terms of injectiveness ```lean def Flat.injective : Prop := ∀ ⦃N N' : ModuleCat.{u} R⦄ (L : N ⟶ N'), Function.Injective L → Function.Injective ((tensorRight (ModuleCat.of R M)).map L) ``` 2. in terms of ideals ```lean def Flat.ideal : Prop := ∀ (I : Ideal R), Function.Injective (TensorProduct.lift ((lsmul R M).comp I.subtype)) ``` 3. in terms of finitely generated ideal ```lean def Flat.fg_ideal : Prop := ∀ ⦃I : Ideal R⦄ (_ : I.FG), Function.Injective (TensorProduct.lift ((lsmul R M).comp I.subtype)) ``` and they are all equivalent: ```lean lemma tfae : List.TFAE [ Flat.injective R M, Flat.ideal R M, Flat.fg_ideal R M ] := by ``` The dependencies between these changed files are: ``` Algebra.Module.LinearMap--------------------------------- \| \| \| \| v v Algebra.Category.ModuleCat.TensorProduct -----> Algebra.Character \| \| \| v Algebra.DirectLimitAndTensorProduct -------------> RingTheory.Flat ``` to prove equivalence of other definitions, e.g. exact functor, tor, etc should be easier with this because the proof is will be categorical --- ------------- Some other stuff not about flatness 1. If $S$ is a submonoid and $I$ is maximally disjoint from $S$ then $I$ is prime 2. if $\mathfrak p$ is a minimal prime, then $x \in \mathfrak p$ implies that $x$ is a zero divisor 3. Noetherian rings has only finitely many minimal ideals 4. One version of [the prime avoidance lemma](https://en.wikipedia.org/wiki/Prime_avoidance_lemma): if $E$ is an addsubgroup of a ring and is mutiplicatively closed, and $\mathfrak p_i$ is some prime ideals, then not being any subset of the individual prime ideal implies that not being a subset of their union ---------- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1828/16	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/TensorProduct.lean,Mathlib/Algebra/Character.lean,Mathlib/Algebra/DirectLimitAndTensorProduct.lean,Mathlib/Algebra/Module/LinearMap.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/Basic.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/Noetherian.lean,Mathlib/CategoryTheory/Functor/Fin.lean,Mathlib/CategoryTheory/ShortExactSequence.lean,Mathlib/RingTheory/Flat.lean,Mathlib/RingTheory/Ideal/Basic.lean,Mathlib/RingTheory/Ideal/MinimalPrime.lean,Mathlib/RingTheory/Ideal/PrimeAvoidance.lean	13	6	['eric-wieser', 'jjaassoonn']	nobody	429-66279 1 year ago	623-45184 1 year ago	0-0 0 seconds
7615	eric-wieser author:eric-wieser	chore(LinearAlgebra/Basic): generalize compatibleMaps to semilinear maps	Spotted while reviewing #7611 --- - [x] depends on: #7611 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI easy merge-conflict label:t-algebra$	9/33	Mathlib/LinearAlgebra/Basic.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	429-66279 1 year ago	451-46983 1 year ago	0-0 0 seconds
7835	shuxuezhuyi author:shuxuezhuyi	feat(LinearAlgebra/Matrix): `lift` for projective special linear group	We provide converters to help with the use of "quotient.liftOn" on projective special linear groups. --- - [x] depends on: #7826 - [x] depends on: #7791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	52/0	Mathlib/LinearAlgebra/Matrix/ProjectiveSpecialLinearGroup.lean	1	3	['jcommelin', 'leanprover-community-mathlib4-bot', 'shuxuezhuyi']	jcommelin assignee:jcommelin	429-66279 1 year ago	450-19738 1 year ago	1-85757 1 day
6777	adomani author:adomani	chore(CovariantClass): replace eta-expanded (· ·), (· + ·), (· ≤ ·), (· < ·)	Replace `CovariantClass X X (· * ·) (· ≤ ·)` with -> `CovariantClass X X HMul.hMul LE.le` and similarly for `HAdd`, `LT`, `Contravariant`. This PR is inspired by [Issue #6646](https://github.com/leanprover-community/mathlib4/issues/6646) and, more specifically, [this comment](https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1692792066). Note that https://github.com/leanprover/lean4/pull/2267 would make this unnecessary --- ```bash # First sed command: # the first captured pattern is `CovariantClass ` # the second captured pattern is `` # the third captured pattern is `+` or `` # the fourth captured pattern is `<` or `≤` # a match for `CovariantClass (· ·) (· ·)` becomes # `CovariantClass replaceop replaceop` # Second sed command: similar to the first, but looks for `(Function.swap (· ·))` sed -i ' s=$Co[ntra]variantClass \(..$ \2 \)(· $[+]$ ·) (· $[<≤]$ ·)=\1replaceop\3 replaceop\4=g s=$Co[ntra]variantClass \(..$ \2 \)($[Functio\.swap ]$(· $[+]$ ·)) (· $[<≤]$ ·)=\1(\3replaceop\4) replaceop\5=g s=replaceop+=HAdd.hAdd=g s=replaceop\=HMul.hMul=g s=replaceop<=LT.lt=g s=replaceop≤=LE.le=g s=$Co[ntra]variantClass N N$ (· \ ·) r=\1 HMul.hMul r=g s=$Co[ntra]variantClass N N (swap μ)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass N N$ (swap (· \* ·)) r=\1 (swap HMul.hMul) r=g s=$CovariantClass (Filter α) (Filter α)$ (· / ·) (· ≤ ·)=\1 HDiv.hDiv LE.le=g s=$CovariantClass (Filter α) (Filter α)$ (swap (· / ·)) (· ≤ ·)=\1 (swap HDiv.hDiv) LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· < ·)=\1 LT.lt=g s=$Co[ntra]variantClass [^}]$ (· ≤ ·)=\1 LE.le=g s=$CovariantClass .* (Filter β)$ (· • ·) LE.le=\1 HSMul.hSMul LE.le=g ' $(git ls-files '*.lean') ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	703/678	Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/Bounds.lean,Mathlib/Algebra/CovariantAndContravariant.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/GroupPower/Order.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Archimedean.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/MinMax.lean,Mathlib/Algebra/Order/Group/OrderIso.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Interval.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/LatticeGroup.lean,Mathlib/Algebra/Order/Module.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Cancel/Defs.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Lemmas.lean,Mathlib/Algebra/Order/Monoid/MinMax.lean,Mathlib/Algebra/Order/Monoid/NatCast.lean,Mathlib/Algebra/Order/Monoid/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Prod.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithZero/Basic.lean,Mathlib/Algebra/Order/Monoid/WithZero/Defs.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Pointwise.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Lemmas.lean,Mathlib/Algebra/Order/Sub/Basic.lean,Mathlib/Algebra/Order/Sub/Canonical.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Order/WithZero.lean,Mathlib/Algebra/Parity.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Normed/Order/Lattice.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/List/BigOperators/Basic.lean,Mathlib/Data/List/BigOperators/Lemmas.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Nat/Cast/Order.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/Real/ENNReal.lean,Mathlib/Data/Real/NNReal.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/Data/Sign.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/VectorMeasure.lean,Mathlib/Order/ConditionallyCompleteLattice/Group.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Martingale/Basic.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/PGame.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/NaturalOps.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Topology/ContinuousFunction/Algebra.lean,lean-toolchain,test/Recall.lean,test/propose.lean	81	36	['adomani', 'alreadydone', 'digama0', 'eric-wieser', 'ericrbg', 'jcommelin', 'leanprover-bot', 'sgouezel']	nobody	429-66279 1 year ago	451-46983 1 year ago	35-56459 35 days
7227	kmill author:kmill	feat: flexible binders and integration into notation3	Introduces `flexibleBinders`, which is an extensible system for binder notations that allow destructuring, bounded domains, and other niceties. Integrates this into `notation3`, and makes `Finset.sum`/`Finset.prod` use it. --- - [ ] depends on: #6833 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict WIP	1215/131	Mathlib.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/NatAntidiagonal.lean,Mathlib/Mathport/Notation.lean,Mathlib/Util/FlexibleBinders.lean,Mathlib/Util/FlexibleBindersFinset.lean,Mathlib/Util/SyntaxFun.lean,test/FlexibleBinders.lean,test/notation3.lean	10	3	['eric-wieser', 'kmill', 'leanprover-community-mathlib4-bot']	nobody	429-66279 1 year ago	632-47715 1 year ago	0-0 0 seconds
7713	RemyDegenne author:RemyDegenne	feat: add_left/right_inj for measures	`μ + ν₁ = μ + ν₂ ↔ ν₁ = ν₂`, and similarly on the right. This is not true in general for measures, but is true when `μ` is mutually singular with the two other measures or when `μ` is finite. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict awaiting-author	53/1	Mathlib/MeasureTheory/Measure/MutuallySingular.lean,lean-toolchain	2	6	['RemyDegenne', 'digama0', 'eric-wieser', 'fpvandoorn']	nobody	429-66279 1 year ago	703-72119 1 year ago	0-62955 17 hours
7962	eric-wieser author:eric-wieser	feat: `DualNumber (Quaternion R)` as a `CliffordAlgebra`	This provides a clifford algebra isomorphic to the dual quaternions --- - [x] depends on: #7934 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	307/7	Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/QuaternionBasis.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Equivs.lean	3	16	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	429-66279 1 year ago	441-44868 1 year ago	0-0 0 seconds
7601	digama0 author:digama0	feat: ring hom support in `ring`	As [requested on Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/aroots/near/395750055). Adds support for distributing ring morphisms in `ring`: ```lean example (p : ℤ[X]) (r : ℤ) : C (2 * r) * p = C r * p + C r * p := by ring ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-meta merge-conflict awaiting-author label:t-algebra$	257/48	Mathlib/Tactic/Ring/Basic.lean,test/linear_combination.lean,test/ring.lean	3	1	['eric-wieser']	nobody	429-66279 1 year ago	486-77271 1 year ago	0-0 0 seconds
6791	eric-wieser author:eric-wieser	refactor: Use flat structures for morphisms	This restores the symmetry we had in Lean3, where we had `MonoidHom.mk f one mul` not `MonoidHom.mk (OneHom.mk f one) mul`, and `f.toFun` wasn't notation for `f.toMulHom.toFun`. The nesting provided by the previous inheritance is useless to us in the face of `MonoidHomClass.toMonoidHom`, which completely eta-expands the structure anyway. We call the class `FunLikeFlatHack._` because this means the field is called `to_` which uses up less space in the goal view than any alternative. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI merge-conflict awaiting-author help-wanted	174/201	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Category/GroupCat/ZModuleEquivalence.lean,Mathlib/Algebra/Category/GroupWithZeroCat.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/Hom/Equiv/Basic.lean,Mathlib/Algebra/Hom/Group/Defs.lean,Mathlib/Algebra/Hom/GroupAction.lean,Mathlib/Algebra/Hom/NonUnitalAlg.lean,Mathlib/Algebra/Hom/Ring/Defs.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Module/Equiv.lean,Mathlib/Algebra/Module/LinearMap.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Algebra/Order/Interval.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Analysis/Normed/Group/SemiNormedGroupCat.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/Rat/Cast/CharZero.lean,Mathlib/Data/Real/EReal.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/LinearAlgebra/Quotient.lean,Mathlib/LinearAlgebra/TensorProduct.lean,Mathlib/RingTheory/RingInvo.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/MetricSpace/Dilation.lean	32	0	[]	nobody	429-66279 1 year ago	746-34139 2 years ago	0-0 0 seconds
7909	mcdoll author:mcdoll	fix(Tactic/Continuity): remove npowRec and add new tag for Continuous.pow	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-meta merge-conflict WIP	14/9	Mathlib/Tactic/Continuity.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean,test/Continuity.lean	3	2	['eric-wieser']	nobody	429-66279 1 year ago	705-6320 1 year ago	0-72515 20 hours
7875	astrainfinita author:astrainfinita	chore: make `SMulCommClass A A B` and `SMulCommClass A B B` higher priority	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra merge-conflict label:t-algebra$	54/48	Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Lie/NonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/NormedSpace/lpSpace.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/GroupTheory/GroupAction/Prod.lean,Mathlib/GroupTheory/GroupAction/Ring.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/GroupTheory/Submonoid/Center.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/RingTheory/Ideal/Quotient.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/Topology/ContinuousFunction/ContinuousMapZero.lean,Mathlib/Topology/ContinuousFunction/StoneWeierstrass.lean,Mathlib/Topology/ContinuousFunction/ZeroAtInfty.lean	27	15	['Parcly-Taxel', 'astrainfinita', 'jcommelin', 'leanprover-bot']	nobody	429-66279 1 year ago	451-46983 1 year ago	1-47913 1 day
7932	eric-wieser author:eric-wieser	refactor(Algebra/TrivSqZeroExt): replace with a structure	This is dogfooding my claim that "one-field structures are the lesser evil in Lean 4". This runs into the `simp [(stupid_parens)]` bug; or rather, a particular nasty instance of it where the offending simp call is inside `@[simps]`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict label:t-algebra$	155/73	Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/Logic/Equiv/TransferInstance.lean,Mathlib/Topology/Instances/TrivSqZeroExt.lean	4	1	['github-actions']	nobody	429-66279 1 year ago	451-46983 1 year ago	0-0 0 seconds
3575	Kha author:Kha	perf: selectively enable precompilation	--- This is an initial performance test on Linux. TODO: - [ ] test on macOS and Windows as well - [ ] adapt caching	merge-conflict WIP	3/0	lakefile.lean	1	21	['Kha', 'kim-em', 'leanprover-bot', 'tydeu']	nobody	429-66278 1 year ago	461-39873 1 year ago	0-0 0 seconds
4775	thorimur author:thorimur	feat: `SubExpr` utilities	This file contains utilities for handling positions in expressions, including folding over subexpressions along with their positions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict WIP	148/0	Mathlib.lean,Mathlib/Lean/SubExpr.lean	2	0	[]	nobody	429-66278 1 year ago	849-77594 2 years ago	0-0 0 seconds
4771	thorimur author:thorimur	feat: Backtrack minimize	Utilities for backtracking in order to attain a minimum according to some arbitrary notion of size when generating lists of parts and alternatives in alternating fashion. Motivated by minimizing the number of generated subgoals under apply-like actions on the goal. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	482/1	Mathlib/Tactic/Backtracking.lean,test/Backtracking.lean	2	0	[]	nobody	429-66278 1 year ago	751-85653 2 years ago	0-0 0 seconds
5133	kmill author:kmill	feat: IntermediateField adjoin syntax for sets of elements	Adds support for both `F⟮S⟯` and `F⟮α⟯`. The term `x` in `F⟮x⟯` is elaborated, and if it has type `Set _` the first interpretation is used, and otherwise the second is. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	110/55	Mathlib/FieldTheory/Adjoin.lean	1	0	[]	nobody	429-66278 1 year ago	785-18142 2 years ago	0-0 0 seconds
3808	kim-em author:kim-em	feat: #formalize, backed by a choice of LLMs	This replaces * https://github.com/leanprover-community/mathlib4/pull/3785, which has essentially been moved to an [independent repository](https://github.com/leanprover-community/llm) and generalised to interface with a choice of OpenAI's GPT, a gpt4all model (running locally via their python binding), or a model compatible with `llama.cpp` (e.g. the 4-bit quantised versions of Meta's LLaMa models). * https://github.com/leanprover-community/mathlib4/pull/3786, which has been modified slightly but still adds code here in `Mathlib.Tactic.Formalize`. Typical output: ``` #formalize "There are infinitely many primes numbers ending with a 7." ``` produces: * GPT4 ``` -- /-- There are infinitely many prime numbers ending with a 7. -/ -- theorem infinitely_many_primes_ending_with_7 : ∀ N : Nat, ∃ p, N < p ∧ p.Prime ∧ p % 10 = 7 := -- sorry ``` * ggml-gpt4all-j-v1.3-groovy.bin: ``` -- There are infinitely many prime numbers that end with a 7. ``` * 7B/ggml-model-q4_0.bin: ``` -- ∀ p : nat, 7 < 7p + 1 := sorry -– \end{code} ``` There are other sample outputs in `test/formalize.lean` If you don't currently have a LLM that the `leanprover-community/llm` project can recognise, when you run `#formalize` you get an error message, which currently reads: ``` Could not find a usable chat bot! You can try one of the following: * Obtain an OpenAI API access key at https://platform.openai.com/account/api-keys, and store it in the environment variable OPENAI_API_KEY. This will enable you to use ChatGPT. * Download the GPT4All-J model `https://gpt4all.io/models/ggml-gpt4all-j-v1.3-groovy.bin`, and put it in either `$HOME/.models/` or `$LLM_MODELS`. Also install the gpt4all python bindings via `pip3 install pygpt4all`. * Clone the `llama.cpp` repository from https://github.com/ggerganov/llama.cpp. Set the environment variable `LLAMA_CPP_HOME` to this repository. Follow the instructions in the README to produce `7B/ggml-model-q4_0.bin` starting from the Meta LLaMa weights. You can store this file at one of * `$LLAMA_CPP_HOME/models/7B/ggml-model-q4_0.bin` * `$HOME/.models/7B/ggml-model-q4_0.bin` * `$LLM_MODELS/7B/ggml-model-q4_0.bin` ``` Currently there are not user-configurable hooks to pick which LLM to use: it checks the conditions described in those bullet points, and takes the first one it finds. (i.e. if you want to use the LLaMa `7B/ggml-model-q4_0.bin`, you have to remove your OpenAI API key!). However a tactic in a downstream project (e.g. mathlib) can specify which interface and model it wants to use, or just call `findChatBot` for the behaviour described in that message. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author	180/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Formalize.lean,lake-manifest.json,lakefile.lean,test/formalize.lean	6	2	['digama0', 'jcommelin']	nobody	429-66278 1 year ago	749-69406 2 years ago	124-45187 124 days
6328	FR-vdash-bot author:FR-vdash-bot	chore: make some instance about `Sub...Class` lower priority	Many similar instances have been marked as lower priority. I'd like to see if this would make things faster. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict WIP label:t-algebra$	14/14	Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/Subsemiring/Basic.lean,lean-toolchain	3	1	['digama0']	nobody	429-66278 1 year ago	703-72886 1 year ago	0-0 0 seconds
6268	eric-wieser author:eric-wieser	Fixups to #3838	This is an attempt to make #3838 universe polymorphic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) * Depends on #6271 * Depends on #8876	merge-conflict WIP	186/107	Mathlib/Control/Random.lean,Mathlib/Tactic/SlimCheck.lean,Mathlib/Testing/SlimCheck/Functions.lean,Mathlib/Testing/SlimCheck/Gen.lean,Mathlib/Testing/SlimCheck/Sampleable.lean,Mathlib/Testing/SlimCheck/Testable.lean,test/slim_check.lean	7	10	['github-actions', 'kim-em']	nobody	429-66278 1 year ago	656-11745 1 year ago	0-0 0 seconds
6210	MohanadAhmed author:MohanadAhmed	feat(Data/IsROrC/Basic): add a `StarOrderedRing` instance	This PR implements a suggestion by @urkud on [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/PartialOrder.20and.20StarOrderedRing.20on.20IsROrC) on how to get a `StarOrderedRing` on the `IsROrC` class. In that discussion the suggested step were: 1. Add PartialOrder K to the list of extends and add le_iff_re_im : z ≤ w ↔ re z ≤ re w ∧ im z = im w to the list of axioms. 2. Prove StarOrderedRing instance for any IsROrC. 3. Add (almost trivial) le_iff_re_im proofs to IsROrC instances for real and complex numbers. This PR does exactly these three steps --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis merge-conflict WIP label:t-algebra$	25/24	Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/IsROrC/Basic.lean	4	19	['MohanadAhmed', 'eric-wieser', 'j-loreaux']	nobody	429-66278 1 year ago	780-69415 2 years ago	0-4269 1 hour
6633	adomani author:adomani	feat(..Polynomial..): `MvPolynomial`s have no zero divisors	This PR continues #6627, placing the `NoZeroDivisors` instance on `MvPolynomial`s and removing auxiliary intermediate results that are no longer needed. Affected files: ``` Data/MvPolynomial/Basic.lean Data/Polynomial/RingDivision.lean RingTheory/Polynomial/Basic.lean ``` --- - [ ] depends on: #6227 for the `NoZeroDivisors` instance on `AddMonoidAlgebra`s [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	143/57	Mathlib/Algebra/MonoidAlgebra/NoZeroDivisors.lean,Mathlib/Data/MvPolynomial/Basic.lean,Mathlib/Data/Polynomial/RingDivision.lean,Mathlib/RingTheory/Polynomial/Basic.lean	4	4	['adomani', 'eric-wieser', 'leanprover-community-mathlib4-bot']	nobody	429-66278 1 year ago	776-27803 2 years ago	0-19160 5 hours
6330	FR-vdash-bot author:FR-vdash-bot	chore: make some instance about `Sub...Class` higher priority than `Sub...`	The opposite direction to #6328. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra merge-conflict WIP label:t-algebra$	123/128	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/FieldTheory/IsAlgClosed/Basic.lean,Mathlib/FieldTheory/Subfield.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/Polynomial/Quotient.lean,Mathlib/RingTheory/Subring/Basic.lean,Mathlib/RingTheory/Subsemiring/Basic.lean,lean-toolchain	11	13	['FR-vdash-bot', 'digama0', 'leanprover-bot']	nobody	429-66278 1 year ago	488-23368 1 year ago	0-0 0 seconds
4960	eric-wieser author:eric-wieser	chore: use `open scoped`	Earlier versions of mathport did not know about this. This was done by searching for all `open` commands referencing: * `Classical` * `BigOperators` * `Topology` * `Pointwise` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI merge-conflict	1026/981	Mathlib/Algebra/AddTorsor.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/NatAntidiagonal.lean,Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/BigOperators/Order.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring.lean,Mathlib/Algebra/BigOperators/RingEquiv.lean,Mathlib/Algebra/Bounds.lean,Mathlib/Algebra/Category/GroupCat/Biproducts.lean,Mathlib/Algebra/Category/GroupCat/FilteredColimits.lean,Mathlib/Algebra/Category/GroupCat/Injective.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Biproducts.lean,Mathlib/Algebra/Category/Mon/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Adjunctions.lean,Mathlib/Algebra/Category/Ring/FilteredColimits.lean,Mathlib/Algebra/CharP/Basic.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/DirectLimit.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/GCDMonoid/Div.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Commute.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Homology/Additive.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/Homology.lean,Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Algebra/Homology/HomotopyCategory.lean,Mathlib/Algebra/Homology/ImageToKernel.lean,Mathlib/Algebra/IndicatorFunction.lean,Mathlib/Algebra/LinearRecurrence.lean,Mathlib/Algebra/Module/BigOperators.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/Algebra/Module/LinearMap.lean,Mathlib/Algebra/Module/PointwisePi.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/Module.lean,Mathlib/Algebra/Order/Pointwise.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Order/SMul.lean,Mathlib/Algebra/Order/UpperLower.lean,Mathlib/Algebra/Periodic.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/GroupRingAction.lean,Mathlib/Algebra/Star/BigOperators.lean,Mathlib/Algebra/Star/Pointwise.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/Algebra/Support.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/Algebra/Tropical/BigOperators.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/Basic.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/Maximal.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/AlgebraicTopology/AlternatingFaceMapComplex.lean,Mathlib/AlgebraicTopology/ExtraDegeneracy.lean,Mathlib/AlgebraicTopology/TopologicalSimplex.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/Asymptotics.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Filter.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/BoxIntegral/Partition/SubboxInduction.lean,Mathlib/Analysis/BoxIntegral/Partition/Tagged.lean,Mathlib/Analysis/Calculus/ContDiffDef.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean	788	0	[]	nobody	429-66278 1 year ago	451-46983 1 year ago	0-0 0 seconds
7076	grunweg author:grunweg	feat: define measure zero subsets of a manifold	A topological manifold has no canonical measure, but there is a canonical notion of measure zero subsets. We show that these are closed under subsets and countable unions (hence define a filter, the almost everywhere filter) and that a closed nowhere dense has empty interior. This is necessary for stating the general version of Sard's theorem (in finite dimensions), and a first step towards its proof. This code was written at LftCM 2023. Thanks for @fpvandoorn for mentoring me! :heart: --- Unresolved questions/looking for feedback - Is "measure zero" a good name or would "null set" be better? I tend towards the former, but welcome input from a measure theorist (which I'm not). - What is the correct definition? One could also define "measure zero" using any `IsOpenPosMeasure` on the charted space. I think all results in this file still hold then, but for applications (e.g., Sard's theorem), this might be too general. - define custom notation, similar to the a.e. filter on a measure space? (We could include $J$ instead of $\mu$.) - what's the right syntax for formulas in docstrings --- use LaTeX or backticks? I don't know how to preview the generated docs, the guidelines are a bit ambiguous for me.	t-measure-probability t-differential-geometry merge-conflict WIP	165/0	Mathlib.lean,Mathlib/Geometry/Manifold/MeasureZero.lean,docs/references.bib	3	27	['ADedecker', 'github-actions', 'grunweg', 'mo271', 'sgouezel']	ADedecker assignee:ADedecker	429-66278 1 year ago	468-62089 1 year ago	43-56043 43 days
6993	jjaassoonn author:jjaassoonn	feat : lemmas about `AddMonoidAlgebra.{divOf, modOf}`	--- - [x] depends on: #7582 - [x] depends on: #8975 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	147/3	Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/MvPolynomial/Basic.lean,Mathlib/Data/MvPolynomial/CommRing.lean,Mathlib/Data/MvPolynomial/Division.lean	5	42	['YaelDillies', 'alreadydone', 'digama0', 'eric-wieser', 'github-actions', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	429-66278 1 year ago	451-46983 1 year ago	102-21189 102 days
4109	kim-em author:kim-em	feat: run library_search when the cursor is at a sorry	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	77/0	Mathlib.lean,Mathlib/Data/Nondet/Basic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/LibrarySearch.lean,Mathlib/Util/CodeAction/RunTactic.lean	5	0	[]	nobody	429-66278 1 year ago	638-70 1 year ago	0-0 0 seconds
5934	eric-wieser author:eric-wieser	feat: port Data.Rat.MetaDefs	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This needs some eyes from people familiar with Qq	t-meta merge-conflict mathlib-port help-wanted	183/0	Mathlib.lean,Mathlib/Data/Rat/MetaDefs.lean,test/rat.lean	3	4	['eric-wieser', 'gebner']	nobody	429-66278 1 year ago	599-53267 1 year ago	0-0 0 seconds
4871	j-loreaux author:j-loreaux	feat: define the additive submonoid of positive elements in a star ordered ring	This file defines the `AddSubmonoid` of nonegative elements `StarOrderedRing.positive R` in a star ordered ring `R` with carrier `{ x : R \| 0 ≤ x }` (in fact, the definition only requires `OrderedAddCommMonoid R` to allow for other use cases, but it is primarily intended for `StarOrderedRing R`). Equivalently, this is the `AddSubmonoid` generated by the elements of the form `star s * s`. Even though this technically corresponds to the nonnegative elements, the "positive" terminology is standard throughout the literature (at least in C⋆-algebra theory and operator theory), so we choose to prefer that. The advantage of using this over other definitions of positivity is that it allows us to unify several different concepts under a single umbrella. For example, one might be tempted to consider the collection of bounded linear operators on an Hilbert space and define positivity as `∀ x, 0 ≤ ⟪T x, x⟫`, but this doesn't generalize nicely to C⋆-algebras. Alternatively, one could define positivity as those self-adjoint elements with nonnegative spectrum, but this requires the algebra to be unital. Our definition herein conveniently sidesteps these issues. --- Note: I declared the `AddMonoidWithOne` and `AddGroupWithOne` instances for `selfAdjoint R` separately because it made the proof of the latter easier. - [x] depends on: #6229 - [x] depends on: #10209 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict label:t-algebra$	216/12	Mathlib.lean,Mathlib/Algebra/Order/Ring/CharZero.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Star/Positive.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/GroupTheory/Submonoid/Operations.lean	6	28	['eric-wieser', 'j-loreaux', 'leanprover-community-mathlib4-bot']	nobody	429-66278 1 year ago	451-46983 1 year ago	5-55287 5 days
6195	eric-wieser author:eric-wieser	chore(RingTheory/TensorProduct): golf the `mul` definition	--- - [x] depends on: #6211 - [x] depends on: #6187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Strangely this causes a timeout downstream	t-algebra awaiting-CI merge-conflict label:t-algebra$	4/29	Mathlib/RingTheory/TensorProduct.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	429-66278 1 year ago	451-46983 1 year ago	0-0 0 seconds
6002	slerpyyy author:slerpyyy	feat(Analysis.SpecialFunctions.Gaussian): add `integrable_fun_mul_exp_neg_mul_sq`	If `f : ℝ → ℝ` is bounded by a polynomial, `fun x : ℝ => f x * exp (-b * x ^ 2)` is integrable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict awaiting-author	26/0	Mathlib/Analysis/SpecialFunctions/Gaussian.lean	1	3	['ocfnash', 'slerpyyy', 'urkud']	nobody	429-66278 1 year ago	694-55875 1 year ago	9-67365 9 days
4127	kmill author:kmill	refactor: create HasAdj class, define Digraph, and generalize some SimpleGraph API	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict awaiting-author	1403/551	Mathlib.lean,Mathlib/Combinatorics/Digraph/Basic.lean,Mathlib/Combinatorics/Graph/Classes.lean,Mathlib/Combinatorics/Graph/Dart.lean,Mathlib/Combinatorics/Graph/Hom.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/Density.lean,Mathlib/Combinatorics/SimpleGraph/Ends/Defs.lean,Mathlib/Combinatorics/SimpleGraph/Finsubgraph.lean,Mathlib/Combinatorics/SimpleGraph/Hasse.lean,Mathlib/Combinatorics/SimpleGraph/Prod.lean,Mathlib/Combinatorics/SimpleGraph/StronglyRegular.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	18	0	[]	nobody	429-66278 1 year ago	470-63706 1 year ago	0-0 0 seconds
5912	ADedecker author:ADedecker	feat(Analysis.Distribution.ContDiffMapSupportedIn): space of smooth maps with support in a fixed compact	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict WIP	513/13	Mathlib.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/Set/Function.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean	8	0	[]	nobody	429-66278 1 year ago	780-33919 2 years ago	0-0 0 seconds
6491	eric-wieser author:eric-wieser	chore(Mathlib/Algebra/Hom/GroupAction): add `SMulHomClass.comp_smul`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	24/10	Mathlib/Algebra/Hom/GroupAction.lean	1	0	[]	nobody	429-66278 1 year ago	451-46983 1 year ago	83-76369 83 days
6307	yuma-mizuno author:yuma-mizuno	refactor(CategoryTheory/Monoidal): add whiskering operators	We introduce whiskering operators. This allows us to introduce a simp-normal form for morphisms in monoidal categories. Rewriting into simp-normal forms is especially useful when combined with the coherence tactic. --- - [x] depends on: #6420 - [x] depends on: #8191 - [x] depends on: #9988 - [x] depends on: #9991 - [x] depends on: #9995 - [x] depends on: #10061 - [x] depends on: #10078 - [x] depends on: #10898 - [x] depends on: #10912 - [x] depends on: #11223 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict awaiting-author	325/280	Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/Closed/Ideal.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/NaturalTransformation.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,test/CategoryTheory/Coherence.lean	15	38	['eric-wieser', 'github-actions', 'grunweg', 'jcommelin', 'kim-em', 'leanprover-community-mathlib4-bot', 'yuma-mizuno']	nobody	429-66278 1 year ago	444-79107 1 year ago	0-0 0 seconds
6403	astrainfinita author:astrainfinita	chore: change instance priorities of `Ordered*` hierarchy	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-order t-algebra merge-conflict awaiting-author label:t-algebra$	253/79	Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Field/Canonical/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/WithZero/Defs.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Star.lean,Mathlib/Algebra/Order/WithZero.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/RingTheory/HahnSeries.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	18	39	['Vierkantor', 'astrainfinita', 'digama0', 'eric-wieser', 'j-loreaux', 'leanprover-bot']	nobody	429-66278 1 year ago	488-23348 1 year ago	13-18399 13 days
6079	eric-wieser author:eric-wieser	fix: deduplicate variables	`variables {A} [Ring A]` meant "update the binder of `A`" in Lean 3, but now means "create a duplicate variable called `A`" (or at least, does so when inspecting the state within the variables line). This removes a number of porting notes that were stumbling over this behavior. [Related Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/unexpected.20.60variable.60.20behaviour.3F/near/360154080) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI merge-conflict	1012/443	Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/CharP/Basic.lean,Mathlib/Algebra/CovariantAndContravariant.lean,Mathlib/Algebra/DirectLimit.lean,Mathlib/Algebra/DirectSum/Finsupp.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Group/Pi.lean,Mathlib/Algebra/GroupPower/Basic.lean,Mathlib/Algebra/GroupPower/Lemmas.lean,Mathlib/Algebra/Hom/Aut.lean,Mathlib/Algebra/Hom/Equiv/Basic.lean,Mathlib/Algebra/Hom/Group.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory.lean,Mathlib/Algebra/Homology/ImageToKernel.lean,Mathlib/Algebra/Homology/ShortComplex/LeftHomology.lean,Mathlib/Algebra/IndicatorFunction.lean,Mathlib/Algebra/Jordan/Basic.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Algebra/Module/LinearMap.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Order/Ring/Lemmas.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/SMulWithZero.lean,Mathlib/Algebra/Star/Module.lean,Mathlib/Algebra/Support.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Point.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicTopology/DoldKan/Decomposition.lean,Mathlib/AlgebraicTopology/MooreComplex.lean,Mathlib/Analysis/Calculus/ContDiff.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Calculus/LocalExtr.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Extreme.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Hull.lean,Mathlib/Analysis/Convex/Independent.lean,Mathlib/Analysis/Convex/Intrinsic.lean,Mathlib/Analysis/Convex/Join.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/BalancedCoreHull.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/LocallyConvex/Bounded.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/Analysis/Normed/Group/Hom.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/NormedSpace/Completion.lean,Mathlib/Analysis/NormedSpace/LinearIsometry.lean,Mathlib/Analysis/NormedSpace/Multilinear.lean,Mathlib/Analysis/NormedSpace/OperatorNorm.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/CategoryTheory/Action.lean,Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation.lean,Mathlib/CategoryTheory/Closed/Ideal.lean,Mathlib/CategoryTheory/ConcreteCategory/UnbundledHom.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Endofunctor/Algebra.lean,Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/FullSubcategory.lean,Mathlib/CategoryTheory/Functor/Category.lean,Mathlib/CategoryTheory/Limits/Fubini.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Biproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Images.lean,Mathlib/CategoryTheory/Limits/Shapes/WidePullbacks.lean,Mathlib/CategoryTheory/Linear/LinearFunctor.lean,Mathlib/CategoryTheory/Localization/Construction.lean,Mathlib/CategoryTheory/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean	302	1	['timotree3']	nobody	429-66278 1 year ago	451-46983 1 year ago	0-0 0 seconds
3757	thorimur author:thorimur	feat: config options for `fail_if_no_progress`	This PR creates config options for `fail_if_no_progress` that allow the user to tweak what exactly counts as "progress". This includes whether to use defeq or `BEq`, what transparency to use, and which parts of the goal and local context to check. It also splits off the comparison functionality into `Mathlib.Lean.Meta.Compare`, which provides fully configurable comparison functions for common complex metaprogramming types not specific to `fail_if_no_progress`. These types are `Expr`, `LocalDecl`, `LocalContext`, `MetavarDecl`, `MVarId`, and `List MVarId`. --- See [zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/progress.20on.20fail_if_no_progress) for a couple review questions. Status update: this PR is now basically done, save for some extra tests which should probably be included. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict WIP	603/54	Mathlib.lean,Mathlib/Lean/Meta.lean,Mathlib/Lean/Meta/Compare.lean,Mathlib/Tactic/FailIfNoProgress.lean,test/fail_if_no_progress.lean	5	38	['alexjbest', 'github-actions', 'joneugster', 'kim-em', 'thorimur']	nobody	429-66277 1 year ago	681-77463 1 year ago	45-49113 45 days
12353	thorimur author:thorimur	feat: `conv%`	This PR introduces `conv% e => tac`, along with `simp%`, `norm_num%`, and `push_neg%`, which are defined in terms of `conv%`. It also introduces `conv%?` (and `simp%?`, `norm_num%?`, and `push_neg%?`) as shortcuts for `show_term ...`. This is a relatively straightforward refactor of code already present in the implementation of `#conv`, and otherwise relies entirely on simple macros. This PR also introduces some modifications to existing command syntax for `#conv`, `#simp`, and `#norm_num`: * The syntax for `#conv` was `#conv tac => e`; however, this is inconsistent with the tactic syntax, and so this has been flipped to `#conv e => tac`. Likewise, `conv%` uses the same (new) syntax `conv% e => tac`. * `#simp` and `#norm_num` separated their config and `only` syntax from the expression by an optional `=>` (for `#simp`) and an optional `:` (for `#norm_num`) (e.g. `#simp only [lem] => e`). These have both been replaced with an optional`on` (e.g. `#simp only [lem] on e`) which is also used for `simp%` and `norm_num%`. Although `#whnf` is implemented in terms of `#conv`, this PR doesn't introduce `whnf%` in the same way, as that's probably better off being implemented directly instead of through `conv`. --- WIP: needs tests. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict WIP	131/32	Mathlib/Tactic/Conv.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/PushNeg.lean,docs/Conv/Guide.lean	4	0	[]	nobody	425-42587 1 year ago	425-42587 1 year ago	0-0 0 seconds
7903	urkud author:urkud	feat: define `UnboundedSpace`	--- The new instances generate some timeouts, and I don't understand why. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict help-wanted	111/59	Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Topology/Bornology/Basic.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/GromovHausdorffRealized.lean	6	1	['github-actions']	nobody	422-54256 1 year ago	422-54256 1 year ago	0-0 0 seconds
14994	kim-em author:kim-em	profiling: skipKernelTC		merge-conflict	2/1	lakefile.lean	1	3	['github-actions', 'kim-em', 'leanprover-bot']	nobody	421-0 1 year ago	421-0 1 year ago	0-0 0 seconds
15400	grunweg author:grunweg	feat: "confusing variables" linter	This linter flags `variable` commands which both update an existing binder annotation and declare new variables: these can yield confusing or misleading error messages (see leanprover/lean4#2789). Instead, these should be split in several `variable` statements. ---------- Help fixing these errors is welcome! Currently, the linter only catches some cases, when the updated binder is from a previous scope. To make it catch all cases, the linter could insert a `section` before the `variable` command and use that scope instead. See [zulip](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Get.20scope.20before.20some.20syntax.20is.20evaluated) [discussions](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Determining.20variable.20binders.20from.20syntax). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict WIP	292/47	Cache/Requests.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Prod.lean,Mathlib/Dynamics/Ergodic/Ergodic.lean,Mathlib/FieldTheory/AbelRuffini.lean,Mathlib/FieldTheory/Adjoin.lean,Mathlib/FieldTheory/IntermediateField.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/Minpoly/MinpolyDiv.lean,Mathlib/FieldTheory/Normal.lean,Mathlib/FieldTheory/PurelyInseparable.lean,Mathlib/Geometry/Manifold/BumpFunction.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/Tactic/Linter/Lint.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,Mathlib/Topology/FiberBundle/Basic.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,test/Lint.lean	22	1	['github-actions']	nobody	417-47350 1 year ago	422-84372 1 year ago	0-0 0 seconds
14654	grunweg author:grunweg	feat(runLinter): allow only running certain linters	This adds a script `run_linter`, which is a fork of batteries' `runLinter` with extra features: - rewrite as a CLI app, so --help messages etc. come for free - add a `--list` option, which prints the list of linters it was about to run, and exists - add `--select`, `--ignore` and `--only` options which ensure certain linters are always run, never resp. that only a certain list of linters are run. (`add` takes priority over `exclude` or `only`.) - add an `update_only_remove` flag which only runs linters mentioned in the `nolints` file: this only removes entries (by design), but is often much faster. - renamed to `run_linter`: actually, per the [zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Naming.20convention/near/450896930), this should be `run-linter` --- and one could as well use the opportunity to rename this to e.g. `env-linter`. Asked [here](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/Configuring.2Fmodernizing.20runLinter). Intended use cases 1. Run `update_only_remove` when updating the nolints file. In fact, it is so fast that it could even run during regular CI, after the normal `lint` step... 2. Run the mathlib linters locally. The simpNF linters are slow enough (for a reason, but still) that doing so is currently annoying. On my notebook, they can easily take half an hour, during which my notebook is otherwise hardly usable. 3. You're developing a new linter and only want to run that one (as there was no change about the other ones). Probably, the nicest result would be this PR landing in batteries (perhaps in pieces) instead of here. --- Two CLI warts I'm unhappy about. - how can I have flag names with a hyphen? Currently, I have to write `--print_linters`, which is less pretty. - many options take an `Array String`: how can I pass this to the executable? This is not obvious to me... [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter RFC merge-conflict	320/146	Mathlib/Analysis/LocallyConvex/Bounded.lean,Mathlib/Analysis/Oscillation.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/MeasureTheory/Measure/EverywherePos.lean,Mathlib/SetTheory/Ordinal/Topology.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/Algebra/Monoid.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/Category/TopCat/Basic.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/CompactOpen.lean,Mathlib/Topology/Compactness/LocallyCompact.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/DenseEmbedding.lean,Mathlib/Topology/Gluing.lean,Mathlib/Topology/Homeomorph.lean,Mathlib/Topology/IndicatorConstPointwise.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/Irreducible.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/LocalAtTarget.lean,Mathlib/Topology/Maps/Basic.lean,Mathlib/Topology/MetricSpace/Isometry.lean,Mathlib/Topology/NoetherianSpace.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/Partial.lean,Mathlib/Topology/PartialHomeomorph.lean,Mathlib/Topology/PartitionOfUnity.lean,Mathlib/Topology/QuasiSeparated.lean,Mathlib/Topology/Separation.lean,Mathlib/Topology/TietzeExtension.lean,Mathlib/Topology/UniformSpace/Ascoli.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Cauchy.lean,Mathlib/Topology/UniformSpace/CompactConvergence.lean,Mathlib/Topology/UniformSpace/Completion.lean,Mathlib/Topology/UniformSpace/Equicontinuity.lean,Mathlib/Topology/UniformSpace/Matrix.lean,Mathlib/Topology/UniformSpace/Pi.lean,Mathlib/Topology/UnitInterval.lean,Mathlib/Topology/UrysohnsBounded.lean,Mathlib/Topology/UrysohnsLemma.lean,Mathlib/Topology/VectorBundle/Basic.lean,lakefile.lean,scripts/run_linter.lean	49	5	['github-actions', 'grunweg', 'rosborn']	nobody	417-24200 1 year ago	417-24200 1 year ago	13-61906 13 days
15679	adomani author:adomani	test: refactor in CI	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	213/5	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,Mathlib.lean,Mathlib/Algebra/Homology/HomotopyCategory/SingleFunctors.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unique.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/CategoryTheory/Bicategory/Adjunction.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/Order/Filter/Cocardinal.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/TestRefactor.lean,Refactor/Main.lean,lakefile.lean,lean-toolchain	21	1	['github-actions']	nobody	417-23432 1 year ago	417-23432 1 year ago	0-8 8 seconds
10629	madvorak author:madvorak	feat: List.cons_sublist_append_iff_right	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	11/0	Mathlib/Data/List/Basic.lean	1	1	['eric-wieser']	nobody	415-59823 1 year ago	415-59823 1 year ago	53-73442 53 days
9973	Ruben-VandeVelde author:Ruben-VandeVelde	feat: polynomials formed by lists	From https://github.com/leanprover-community/mathlib/pull/15476 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict please-adopt	311/0	Mathlib.lean,Mathlib/Data/Polynomial/OfList.lean	2	0	[]	nobody	415-59356 1 year ago	415-59356 1 year ago	0-0 0 seconds
12926	joelriou author:joelriou	feat(CategoryTheory): the monoidal category structure induced by a monoidal functor	In this PR, given a monoidal functor `F : MonoidalFunctor C D`, we define a monoidal category structure on the category `InducedCategory D F.obj`, which has the "same" objects as `C`, but the morphisms between `X` and `Y` identify to `F.obj X ⟶ F.obj Y`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	105/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Induced.lean	2	3	['eric-wieser', 'github-actions', 'joelriou']	nobody	415-57755 1 year ago	415-57755 1 year ago	0-0 0 seconds
12869	adomani author:adomani	feat: linter and script for `theorem` vs `lemma`	This PR contains a linter for flagging doc-string-less `theorem`s, as well as a bash script that, once the linter ran on Mathlib, automatically replaces every linter-offending `theorem` by `lemma`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict awaiting-author	106/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ThmLemma.lean,scripts/thmLemma.sh	4	13	['adomani', 'github-actions', 'grunweg', 'joneugster']	nobody	415-44519 1 year ago	415-44519 1 year ago	0-0 0 seconds
14308	grhkm21 author:grhkm21	feat(Algebra/Category): Direct construction of colimits in algebraic categories	(Below I only write about colimits since that's what I'm familiar with after working on it the last few days, but maybe it's the same for other categorical constructions) Main feature: Construct colimits in `AddCommGrp`/`ModuleCat`/`FGModuleCat`(/...) directly as coequalizer (i.e. cokernel i.e. quotient) of two maps, allowing one to say $\coprod_j M_j \cong $ Currently, if you look at how colimits are constructed for [AddCommGrp](https://github.com/leanprover-community/mathlib4/blob/master/Mathlib/Algebra/Category/Grp/Colimits.lean#L69-L92), you see this massive block of code of all relations generating the quotient relation, but that's kind of bad, you can't say anything concretely about it. Also as noted in the TODOs of a few files: ``` TODO: In fact, in `ModuleCat R` there is a much nicer model of colimits as quotients of finitely supported functions, and we really should implement this as well. ``` I wrote it down [here](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Braided.20left.20rigid.20categories.20are.20right.20rigid/near/447490672), and have formalised it* in a small file already [here](https://gist.github.com/grhkm21/5b2d938753c0ce0900d21c93a39e3b7d#file-addcommgrpcolimits-lean-L162-L163) (I also have a `ModuleCat` version, and proving existence of colimits in `FGModuleCat` from it). Usually I will try to merge the file into Mathlib directly (preferably in one sitting), but I have been trying for a while now and been struggling. One issue is I am struggling to understand universes, which I asked [here](https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Universe.20constraints!/near/448049266) along with many other places. A more concrete issue is that - [ ] FGModuleCat (and `FullSubcategory` in general) requires morphism and objects to be on the same universe, whereas generally `Category.{v, u}` don't. So that seems to limit what I can express, and maybe I have to fix it first. Here are a few more TODOs just so I don't forget, probably done before the one above: - [ ] Generalise `cokernelIsoQuotient` to other categories. - [ ] Also prove `coproductIsoDirectSum` - [ ] Also prove coequalizer (f + h) (g + h) ~ coequalizer f g ~ cokernel (f - g) 0 - [ ] Fix typo `FGModuleCatCat` If anyone is familiar with universe stuff and can answer my many questions that'll be great too. I need help understanding just [these five lines](https://github.com/leanprover-community/mathlib4/blob/master/Mathlib/Algebra/Category/Grp/Colimits.lean#L267-L271)	t-algebra merge-conflict WIP label:t-algebra$	10/3	Mathlib/Algebra/DirectSum/Module.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean	2	1	['github-actions']	nobody	414-56540 1 year ago	414-56540 1 year ago	0-0 0 seconds
13010	ADedecker author:ADedecker	feat: relax universe constraint in stoneCechExtend	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	33/3	Mathlib/Topology/StoneCech.lean	1	2	['ADedecker', 'erdOne']	nobody	414-56337 1 year ago	414-56337 1 year ago	0-0 0 seconds
12411	adomani author:adomani	feat: more linting of cdots	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	953/617	Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib.lean,Mathlib/Algebra/Category/GroupCat/Colimits.lean,Mathlib/Algebra/Homology/Exact.lean,Mathlib/Algebra/Homology/LocalCohomology.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/Order/Archimedean.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ApproximatesLinearOn.lean,Mathlib/Analysis/Calculus/LocalExtr/Basic.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Normed/Group/ControlledClosure.lean,Mathlib/Analysis/Normed/Group/Pointwise.lean,Mathlib/Analysis/NormedSpace/FiniteDimension.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Separation.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/NormedSpace/Star/Basic.lean,Mathlib/Analysis/NormedSpace/Star/Multiplier.lean,Mathlib/Analysis/NormedSpace/lpSpace.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Log/Monotone.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/CategoryTheory/Abelian/Basic.lean,Mathlib/CategoryTheory/Action.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation.lean,Mathlib/CategoryTheory/Category/Cat/Limit.lean,Mathlib/CategoryTheory/Category/PartialFun.lean,Mathlib/CategoryTheory/Category/TwoP.lean,Mathlib/CategoryTheory/Closed/Cartesian.lean,Mathlib/CategoryTheory/Functor/Flat.lean,Mathlib/CategoryTheory/Galois/GaloisObjects.lean,Mathlib/CategoryTheory/Limits/Over.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Localization/Predicate.lean,Mathlib/CategoryTheory/Monad/Coequalizer.lean,Mathlib/CategoryTheory/Monad/Monadicity.lean,Mathlib/CategoryTheory/Pi/Basic.lean,Mathlib/CategoryTheory/Sites/DenseSubsite.lean,Mathlib/CategoryTheory/Sites/InducedTopology.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/HalesJewett.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Computability/Reduce.lean,Mathlib/Data/Holor.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Pairing.lean,Mathlib/Data/Real/Cardinality.lean,Mathlib/Data/Real/Hyperreal.lean,Mathlib/Data/Real/Irrational.lean,Mathlib/Data/Set/Card.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/FieldTheory/Finite/Polynomial.lean,Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean,Mathlib/FieldTheory/PerfectClosure.lean,Mathlib/FieldTheory/RatFunc.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace/Gluing.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/GroupTheory/Perm/Finite.lean,Mathlib/GroupTheory/SpecificGroups/Quaternion.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/LinearAlgebra/Dimension/RankNullity.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/LinearAlgebra/Prod.lean,Mathlib/LinearAlgebra/QuadraticForm/Complex.lean,Mathlib/LinearAlgebra/Reflection.lean,Mathlib/MeasureTheory/Constructions/Pi.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean,Mathlib/MeasureTheory/Measure/Haar/Basic.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean,Mathlib/MeasureTheory/OuterMeasure/Basic.lean,Mathlib/ModelTheory/Skolem.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/Padics/RingHoms.lean,Mathlib/NumberTheory/RamificationInertia.lean,Mathlib/RingTheory/AdjoinRoot.lean	147	2	['adomani', 'leanprover-bot']	nobody	414-56200 1 year ago	414-56200 1 year ago	0-0 0 seconds
12279	casavaca author:casavaca	WIP: feat: Holder's inequality n-ary	--- - [x] depends on #12291 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict WIP	129/0	Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean	2	13	['github-actions']	nobody	414-56185 1 year ago	414-56185 1 year ago	0-0 0 seconds
12093	ADedecker author:ADedecker	feat: tweak the definition of semicontinuity to behave better in nonlinear orders	Summary of the changes: - change definitions to make [lowerSemicontinuous_iff_isClosed_preimage](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Semicontinuous.html#lowerSemicontinuous_iff_isClosed_preimage) true without assuming `LinearOrder`, so that semicontinuity corresponds to continuity for lower/upper order topology on the codomain. See discussion on [Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Semicontinuity.20definition.20for.20non-linear.20orders/near/432898278) - add new `iff` lemmas for unfolding the definition - add `iff` lemmas with the old definition in the linearly ordered case - some basic lemmas need to be changed in an easy way - minimize assumptions for continuity => semicontinuity - prove the semicontinuity criterion for indicators using "preimage of Ici/Iic" instead of a direct proof, because the proof is more natural (especially because we have no `filter_upwards` for `Frequently`) - in the rest of the file (which is about linear orders anyway), we don't touch the statements and just rewrite to the old definition. Some of these could be generalized, but we keep that for a later PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict WIP	274/130	Mathlib/Analysis/BoundedVariation.lean,Mathlib/MeasureTheory/Integral/FundThmCalculus.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Topology/Semicontinuous.lean	4	0	[]	nobody	414-56147 1 year ago	414-56147 1 year ago	0-0 0 seconds
11519	thorimur author:thorimur	feat: `syntax_rules`	--- Experimental. WIP. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	485/0	Mathlib.lean,Mathlib/Command/SyntaxRules.lean,Mathlib/Command/SyntaxRules/Attr.lean,Mathlib/Command/SyntaxRules/Elab.lean,Mathlib/Command/SyntaxRules/Header.lean,Mathlib/Command/SyntaxRules/Util.lean,scripts/noshake.json	7	0	[]	nobody	414-56123 1 year ago	414-56123 1 year ago	0-0 0 seconds
11393	mcdoll author:mcdoll	feat(Analysis/Distribution/SchwartzSpace): The Heine-Borel property	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict WIP	688/3	Mathlib.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/UniformSpace/Ascoli.lean,Mathlib/Topology/UniformSpace/Pi.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean	6	0	[]	nobody	414-56113 1 year ago	414-56113 1 year ago	0-0 0 seconds
9444	erdOne author:erdOne	feat: Various instances regarding `𝓞 K`.	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory merge-conflict help-wanted	27/0	Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/RingTheory/IntegralClosure.lean	2	9	['erdOne', 'leanprover-bot', 'mattrobball', 'riccardobrasca', 'xroblot']	nobody	414-56032 1 year ago	414-56032 1 year ago	0-0 0 seconds
8931	hmonroe author:hmonroe	feat(Computable): define P, NP, and NP-complete	Revised to focus on languages that are binary strings, given the issue of non-acceptable encodings of unspecified Types --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability merge-conflict awaiting-author	381/5	Mathlib.lean,Mathlib/Computability/Complexity copy.lean,Mathlib/Computability/Complexity.lean,Mathlib/Computability/Encoding.lean,Mathlib/Computability/TMComputable.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Computability/halting example.lean,docs/references.bib	8	3	['fpvandoorn', 'github-actions', 'hmonroe']	nobody	414-55997 1 year ago	414-55997 1 year ago	5-62479 5 days
10641	newell author:newell	feat(Topology/MetricSpace/WellSpaced): Define sets that are well-spaced.	Create a new file `Mathlib.Topology.MetricSpace.WellSpaced` that contains definitions of sets which are in some sense well-spaced. Some examples are Delone and Meyer sets, which find applications in Quasicrystals and Coding Theory, among others. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	1073/14	Mathlib.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/GMetric/Basic.lean,Mathlib/Topology/GMetric/GInfSep.lean,Mathlib/Topology/GMetric/WellSpaced.lean,Mathlib/Topology/GPseudoMetric/Basic.lean,Mathlib/Topology/MetricSpace/WellSpaced.lean	8	1	['edegeltje']	nobody	414-55965 1 year ago	414-55965 1 year ago	0-0 0 seconds
10428	dwrensha author:dwrensha	feat: add simp_digits tactic	With the introduction of the simprocs `reduceLE`, `reduceMod`, `reduceDiv` etc. in Lean v4.6.0, now `simp` can fully normalize typical `Nat.digits` calls that have concrete arguments. The situation is still a bit delicate however, as we want to avoid invoking kernel reduction on `Nat.digits`, because the `Acc`-based ("well founded") recursion in `digitsAux` can get bogged down. This PR introduces a new tactic `simp_digits` tactic that contains only the simp lemmas and simprocs needed to reduce `Nat.digits`. This allows proofs involving `Nat.digits` to be cleanly factored into two steps: 1. reduce `Nat.digits` via `simp_digits`, 2. do things that require kernel reduction such as `simp_arith`, `decide`, or `rfl`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	6/124	Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q1.lean,Mathlib/Data/Nat/Digits.lean	3	2	['dwrensha']	nobody	414-55819 1 year ago	414-55819 1 year ago	0-0 0 seconds
8608	eric-wieser author:eric-wieser	feat: multiplicativize `AddTorsor`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	268/199	Mathlib/Algebra/AddTorsor.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Data/Set/Pointwise/SMul.lean,Mathlib/Tactic/ToAdditive.lean	4	0	[]	nobody	414-55642 1 year ago	414-55642 1 year ago	0-0 0 seconds
6603	tydeu author:tydeu	feat: automatically try `cache get` before build	--- A quick proof-of-concept. With this, `lake build` will always try `cache get` before building mathlib. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict WIP	29/0	lakefile.lean	1	3	['kim-em', 'tydeu']	nobody	414-55584 1 year ago	414-55584 1 year ago	11-1960 11 days
6058	apurvnakade author:apurvnakade	feat: duality theory for cone programs	This PR tracks the development of duality theory for cone programs. [Reference](https://ti.inf.ethz.ch/ew/courses/ApproxSDP09/notes/conelp.pdf) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #6059 - [ ] define direct sum of cones - [ ] weak duality - [ ] regular duality - [ ] slater condition - [ ] strong duality	t-analysis merge-conflict WIP	159/0	Mathlib.lean,Mathlib/Analysis/Convex/Cone/ConeLinearProgram.lean	2	1	['leanprover-community-mathlib4-bot']	nobody	414-55529 1 year ago	414-55529 1 year ago	0-0 0 seconds
6449	ADedecker author:ADedecker	feat: functions with finite fibers	--- This has been discussed before on [Zulip](https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/.E2.9C.94.20Cofinite.20maps.3F) and it came up again while working with @kkytola's student. As explained in the docstring, we could absolutely just use `Tendsto f cofinite cofinite` all the time, but (1) we lack some API for it (2) the API is nicer to setup if we have a separate def (e.g for dot notation) and (3) mentioning filters for such a simple concept is really not beginner-friendly. I'm not sure at all about the name. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict awaiting-author	203/0	Mathlib.lean,Mathlib/Logic/Function/HasFiniteFibers.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Cofinite.lean	4	14	['ADedecker', 'YaelDillies', 'alexjbest', 'kkytola']	nobody	414-55523 1 year ago	414-55523 1 year ago	6-70040 6 days
8100	digama0 author:digama0	feat: add support for other types in norm_num	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	177/12	Mathlib/Tactic/NormNum/Basic.lean,Mathlib/Tactic/NormNum/Eq.lean,Mathlib/Tactic/NormNum/Ineq.lean,Mathlib/Tactic/NormNum/Pow.lean,Mathlib/Tactic/NormNum/Result.lean,Mathlib/Tactic/NormNum/Structural.lean,test/norm_num.lean	7	4	['dwrensha']	nobody	414-55391 1 year ago	414-55391 1 year ago	0-0 0 seconds
15586	astrainfinita author:astrainfinita	test make `HasQuotient` out put a `setoid`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	22/36	Mathlib/Algebra/Lie/CartanExists.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Lie/Weights/Basic.lean,Mathlib/Algebra/Quotient.lean,Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/GroupTheory/Commensurable.lean,Mathlib/GroupTheory/Coset.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/QuotientGroup.lean,Mathlib/LinearAlgebra/Quotient.lean,Mathlib/RingTheory/Ideal/Quotient.lean,Mathlib/Topology/Algebra/UniformRing.lean	14	5	['astrainfinita', 'github-actions', 'leanprover-bot']	nobody	413-1399 1 year ago	413-1399 1 year ago	0-0 0 seconds
15585	FR-vdash-bot author:FR-vdash-bot	test make `HasQuotient.quotient'` reducible	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	8/1	Mathlib/Algebra/Quotient.lean,Mathlib/GroupTheory/Coset.lean	2	1	['github-actions']	nobody	413-1399 1 year ago	413-1399 1 year ago	0-0 0 seconds
13791	digama0 author:digama0	refactor: Primrec and Partrec	General cleanup of the `Primrec` and `Partrec` files, to better adjust to lean 4 things. The main user-visible change is that `Primrec₂` is no longer a `def` but an `abbrev`, because it was causing inference issues in lean 4. I also removed all the nonterminal `simp`s in `PartrecCode.lean`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-computability merge-conflict	585/778	Mathlib/Computability/Ackermann.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/Primrec.lean	5	2	['github-actions', 'grunweg']	nobody	411-22668 1 year ago	451-46983 1 year ago	1-84718 1 day
11964	adamtopaz author:adamtopaz	feat: The functor of points of a scheme	We construct the functor of points functor, and prove that it's full and faithful. --- - [ ] depends on: #11947 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-category-theory merge-conflict	210/0	Mathlib.lean,Mathlib/AlgebraicGeometry/FunctorOfPoints.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean	3	4	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	411-22527 1 year ago	451-46983 1 year ago	0-1223 20 minutes
12418	rosborn author:rosborn	style: replace preimage_val with ↓∩ notation	--- This is a rough draft of what the new `↓∩` notation would look like within mathlib. I believe this is an improvement in clarity and would like to have `↓∩` as a standard notation (along with `''`, `⁻¹'`, `↑`, etc...). As `↓∩` is specialized for `Set`s, I have only changed `preimage_val` when the left-hand side of `↓∩` is a `Set`. The introduction of the `↓∩` notation to Data.Set.Image is temporary as it isn't possible to import Data.Set.Subset directly. If we want `↓∩` unscoped, where would be the best place to define it? An option is Data.Set.Defs, but the notation cannot be defined without additional imports as the file does not import `notation3`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	56/61	Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Subset.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/LocalAtTarget.lean,Mathlib/Topology/LocallyConstant/Basic.lean,Mathlib/Topology/Separation.lean,Mathlib/Topology/Sober.lean	18	3	['grunweg', 'rosborn']	nobody	411-22426 1 year ago	451-46983 1 year ago	29-14218 29 days
9978	FR-vdash-bot author:FR-vdash-bot	chore(FieldTheory/KummerExtension): move some lemmas earlier	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	197/177	Mathlib.lean,Mathlib/Data/Polynomial/FieldDivision.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Polynomial/Irreducible.lean	5	5	['alreadydone', 'grunweg', 'riccardobrasca']	nobody	411-22218 1 year ago	411-22218 1 year ago	8-83342 8 days
12429	adomani author:adomani	feat: toND -- auto-generating natDegree	This is an experiment to automatically translate theorems about `degree` to theorems about `natDegree`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC t-meta merge-conflict awaiting-author label:t-algebra$	167/132	Mathlib.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Algebra/Polynomial/Inductions.lean,Mathlib/Algebra/Polynomial/Mirror.lean,Mathlib/Algebra/Polynomial/Reverse.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ToNatDegree.lean,scripts/noshake.json	11	2	['adomani', 'grunweg']	nobody	411-21529 1 year ago	411-21529 1 year ago	0-0 0 seconds
15823	eric-wieser author:eric-wieser	Quotients of rings in model theory	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict	55/13	Mathlib/ModelTheory/Algebra/Ring/FreeCommRing.lean,Mathlib/ModelTheory/Syntax.lean	2	1	['github-actions']	nobody	411-92 1 year ago	411-92 1 year ago	0-0 0 seconds
12178	joneugster author:joneugster	feat(Data/Matrix/Basic): add notation for `m×n`-Matrices	Introduce the notation `Mat[m,n][R]` for `Matrix (Fin m) (Fin n) R`. [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Why.20does.20.60Matrix.2Erow.60.20use.20.20.60Unit.60.20instead.20of.20.60Fin.201.60.3F/near/427949223) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	139/135	Mathlib/Algebra/Lie/CartanMatrix.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Rank.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/LinearAlgebra/Matrix/Adjugate.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/LinearAlgebra/Matrix/Determinant.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/Matrix/Transvection.lean,Mathlib/LinearAlgebra/PID.lean,Mathlib/LinearAlgebra/Vandermonde.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/ModularForms/CongruenceSubgroups.lean,Mathlib/NumberTheory/ModularForms/SlashActions.lean,Mathlib/NumberTheory/ModularForms/SlashInvariantForms.lean,Mathlib/NumberTheory/RamificationInertia.lean,Mathlib/RingTheory/SimpleModule.lean,test/matrix.lean	22	9	['YaelDillies', 'eric-wieser', 'grunweg', 'joneugster']	nobody	410-63616 1 year ago	410-67530 1 year ago	0-0 0 seconds
12751	Command-Master author:Command-Master	feat: add lemmas for Nat/Bits, Nat/Bitwise and Nat/Size	Remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict	66/7	Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Size.lean	4	26	['Command-Master', 'Rida-Hamadani', 'Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'jcommelin']	nobody	410-43580 1 year ago	415-59822 1 year ago	54-52408 54 days
15448	urkud author:urkud	chore(*): deprecate `Option.elim'`	Use `Option.elim` instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt merge-conflict awaiting-author	54/50	Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/Calculus/LagrangeMultipliers.lean,Mathlib/CategoryTheory/Category/PartialFun.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Data/Option/Defs.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/Logic/Embedding/Set.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/Topology/Compactness/Paracompact.lean,Mathlib/Topology/LocallyFinite.lean	17	12	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'grunweg', 'urkud']	nobody	410-32633 1 year ago	411-21780 1 year ago	7-18420 7 days
10349	Shamrock-Frost author:Shamrock-Frost	refactor(CategoryTheory/MorphismProperty)	We make explicit some of the galois connections/closure operators in the existing MorphismProperty file, rewrite some proofs to take advantage of these structures, and change map/inverseImage by (1) swapping their argument order, for consistency with Set.range and Set.preimage and (2) making "map" perform the strict, evil map while "essMap" (previously called map) forms the closure of the image under isomorphisms. Finally we add `IsMultiplicative` instances for isos/epis/monos, with an eye towards constructing the wide subcategory on these classes of maps. --- - [x] depends on: #10347 - [ ] depends on: #10348 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	474/318	Mathlib/CategoryTheory/Localization/Composition.lean,Mathlib/CategoryTheory/Localization/LocalizerMorphism.lean,Mathlib/CategoryTheory/MorphismProperty.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/Order/Closure.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/CompleteLattice.lean,Mathlib/Order/RelIso/Basic.lean	8	1	['leanprover-community-mathlib4-bot']	nobody	408-45863 1 year ago	451-46983 1 year ago	0-418 6 minutes
10350	Shamrock-Frost author:Shamrock-Frost	feat(Data/Setoid): add the operations of taking the equivalence class of an element and of saturating a set wrt an equivalence relation	I'm open to suggestions about changing the name "saturate", someone on zulip rightly pointed out this is a very overloaded term in math. That said, I think it's unlikely to cause confusion and that there's only one reasonable interpretation in the context of setoids. --- - [x] depends on: #10347 - [x] depends on: #10348 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	169/3	Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/Order/Closure.lean	3	1	['leanprover-community-mathlib4-bot']	nobody	408-45854 1 year ago	415-59824 1 year ago	19-74514 19 days
13573	Shamrock-Frost author:Shamrock-Frost	feat: add multivariate polynomial modules	Add a type synonym for multivariate polynomials with coefficients in a module. --- Multivariate polynomials with module coefficients are sort of silly, but they sometimes show up in commutative algebra (eg in the definition of a quasi regular sequence). Writing this code involved a lot of copy and pasting from `PolynomialModule` and `MvPolynomial`. The API is definitely lacking at this stage but it's a start. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	691/6	Mathlib.lean,Mathlib/Algebra/MvPolynomial/Module/Basic.lean,Mathlib/Algebra/MvPolynomial/Module/MvAEval.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean	4	9	['Shamrock-Frost', 'erdOne', 'github-actions']	nobody	408-45834 1 year ago	414-56429 1 year ago	39-72739 39 days
6517	MohanadAhmed author:MohanadAhmed	feat: discrete Fourier transform of a finite sequence	# Discrete Fourier Transform (DFT) Matrix and DFT of a (finite) sequence This file defines the `dft` opertaion on a sequence (also a vecotr) and the DFT operation matrix ## Main definitions - `dft v`: given a sequence (v : (Fin n) → ℂ) we can transform it into a sequence (V : (Fin n) →ℂ) such that $$V [p] = ∑_{k = 0}^{N - 1} e^{-j2πkp/n} v [k]$$ - `idft V` : given a sequence (V : (Fin n) → ℂ) we can transform it into a sequence (v : (Fin n) → ℂ) such that $$v [k] = \frac{1}{N}∑_{p = 0}^{n - 1} e^{j2πkp/N} v [p]$$ - `dftMatrix n` : the dft matrix of dimensions $n \times n$ with the `k, p` entry equal to $$Wₙ[k, p] = e^{-j2πkp/n}$$ - `(dftMatrix n)⁻¹` : the idft matrix of dimensions $n \times n$ with the `k, p` entry equal to $$Wₙ[k, p] = (1/N) e^{j2πkp/n}$$ ## Main results - `dft v = (dftMatrix n) v` : the dft operation on a sequence is the same as the dft matrix applied to the vector - `idft V = (dftMatrix n)⁻¹ V` : the idft operation on a sequence is the same as the idft matrix applied to the vector - `dft (idft v) = dft ( idft v) = v` the dft and idft operations are inverses - `Wₙ = vandermonde (w)` : the dft matrix is vandermonde with `w` being the first row of the dft matrix - `circulant t = (dftMatrix n)⁻¹ ⬝ diagonal (dft t) ⬝ (dftMatrix n)` : a circulant matrix is diagonalizable by the dft and idft matrix pair. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	294/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/DFT.lean	2	26	['MohanadAhmed', 'ericrbg']	nobody	408-45672 1 year ago	487-35262 1 year ago	65-20427 65 days
13155	alreadydone author:alreadydone	feat(NumberTheory/EllipticDivisibilitySequence): show elliptic relations follow from even-odd recursion	This PR is centered around the (generalized) elliptic relations (`rel₄`) $E(a,b,c,d): W_{a+b}W_{a-b}W_{c+d}W_{c-d}=W_{a+c}W_{a-c}W_{b+d}W_{b-d}-W_{a+d}W_{a-d}W_{b+c}W_{b-c}$. For an integer-indexed sequence W valued in a commutative ring, the relation makes sense only when a,b,c,d are all integers or all half integers. For convenience of formalization, we instead consider integers a,b,c,d of the same parity and divide all subscripts by 2. We extract the subexpression $W_{(a+b)/2}W_{(a-b)/2}$ (which appear six times) as `addMulSub W a b`. The collection of all $E(a,b,c,d)$ is equivalent to Stange's axiom for elliptic nets (`net`), and the literature (e.g. Silverman) commonly consider only the three-index special case $E(m,n,r,0)$ (`Rel₃`). Important special cases of these relations are (i) $E(m+1,m,1,0): W_{2m+1}W_1^3=W_{m+2}W_m^3-W_{m+1}^3 W_{m-1}$ (`oddRec`) and (ii) $E(m+1,m-1,1,0): W_{2m}W_2 W_1^2=W_m(W_{m+2}W_{m-1}^2-W_{m-2}W_{m+1}^2)$ (`evenRec`), which suffice to uniquely specify $W$ on all positive integers recursively from four initial values $W_1, W_2, W_3, W_4$ (`IsEllSequence.ext`, if $W_1 W_2$ is not a zero divisor). In the usual setting where $W_1=1$ and $W_2\mid W_4$, there does exist a sequence (`normEDS`) satisfying (i) and (ii) given initial values $W_2, W_3$ and $W_4/W_2$. It turns out the same non-zerodivisor condition also guarantees that W is an odd function with $W_0=0$, which naturally extends W to all integers. The main result of this PR (`rel₄_of_oddRec_evenRec`, `IsEllSequence.of_oddRec_evenRec`) is a purely algebraic proof that the sequence W defined by the single-parameter elliptic relations (i) and (ii) implies all $E(a,b,c,d)$, based on my original argument first published on [Math.SE](https://math.stackexchange.com/a/4903422/12932). It's based on the observation that a nonzerodivisor-multiple of $E(a,b,c,d)$ can be expressed as a linear combination of various $E(a,b,c_\min,d_\min)$ with the two smallest indices fixed at their minimal possible values, which can be transformed (`transf`) to an elliptic relation with smaller `a` (which can be assumed to hold by induction), unless they are of the form (i) or (ii) which hold by assumption. For this argument it's necessary to assume `a > b > c > d ≥ 0` (see `StrictAnti₄` and `Rel₄OfValid`), but it's easy to extend to arbitrary a,b,c,d by symmetry properties of `rel₄` under negation and permutations of indices. In the subsequent PR #13057, we show all normalized EDSs (`normEDS`), defined using the even-odd recursion (i)-(ii), are elliptic (i.e. satisfy the elliptic relations) divisibility sequences. This PR doesn't directly apply because a normEDS doesn't always satisfy the nonzerodivisor condition, but they are specializations of the universal normEDS, which does satisfy the condition. The technique of reducing to the universal case will be applied many times, and relies on the naturality (`map`) lemmas. We also change the `ℕ` in the definition `IsDivSequence` to `ℤ` which is more natural given that W is a `ℤ`-indexed sequence. --- - [x] depends on: #13153 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory merge-conflict awaiting-author label:t-algebra$	565/12	Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	1	55	['Multramate', 'alreadydone', 'github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	402-59276 1 year ago	402-59276 1 year ago	26-39367 26 days
15600	adomani author:adomani	feat: lint also `let` vs `have`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict WIP	77/26	Mathlib/Tactic/Linter/HaveLetLinter.lean,test/HaveLetLinter.lean	2	1	['github-actions']	nobody	401-27552 1 year ago	401-27552 1 year ago	0-8 8 seconds
13970	adomani author:adomani	feat: a linter to flag unnecessary uses of `nolint simpNF`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict awaiting-author	230/0	Mathlib.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/CategoryTheory/Comma/Arrow.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Even.lean,Mathlib/LinearAlgebra/CliffordAlgebra/EvenEquiv.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/UnnecessarySyntax.lean,test/UnnecessarySyntax.lean	13	4	['adomani', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	399-50766 1 year ago	399-50767 1 year ago	0-0 0 seconds
15162	adomani author:adomani	feat: checkAsSorry linter	A very preliminary version of the `checkAsSorry` linter. It flags declarations whose type is not equal to the 'asSorry'ed one. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Running.20Mathlib.20under.20.60set_option.20debug.2EbyAsSorry.60) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	119/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/CheckAsSorry.lean,test/CheckAsSorry.lean	4	1	['github-actions']	nobody	399-49754 1 year ago	399-49754 1 year ago	0-0 0 seconds
14046	adomani author:adomani	test: diff of declarations in lean	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	231/2	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,.github/workflows/mk_build_yml.sh,Mathlib/Tactic/Eval.lean,scripts/decls_diff_hybrid.sh,scripts/list_decls.lean	8	2	['github-actions']	nobody	395-43268 1 year ago	395-43268 1 year ago	0-0 0 seconds
14038	adomani author:adomani	test/decl diff in lean dev	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	231/2	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,.github/workflows/mk_build_yml.sh,Mathlib/Tactic/Eval.lean,scripts/decls_diff_hybrid.sh,scripts/list_decls.lean	8	3	['github-actions']	nobody	395-43268 1 year ago	395-43268 1 year ago	0-0 0 seconds
12107	yuma-mizuno author:yuma-mizuno	feat(Mathlib/Tactic/Widget/StringDiagram): support 2-morphisms in bicategories	--- - [x] depends on: #11080 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory t-meta merge-conflict	1158/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Coherence.lean,Mathlib/Tactic/Widget/StringDiagram.lean,scripts/noshake.json,test/StringDiagram.lean,widget/src/penrose/monoidal.dsl,widget/src/penrose/monoidal.sty	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	390-38012 1 year ago	390-38015 1 year ago	0-0 0 seconds
15925	yuma-mizuno author:yuma-mizuno	feat(CategoryTheory/Monoida): proof producing coherence tactic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory t-meta merge-conflict	5018/265	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Adjunction.lean,Mathlib/CategoryTheory/Bicategory/Kan/Adjunction.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/CoherenceLemmas.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Basic.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Braided.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/BicategoricalComp.lean,Mathlib/Tactic/CategoryTheory/Bicategory/Normalize.lean,Mathlib/Tactic/CategoryTheory/Bicategory/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/Coherence.lean,Mathlib/Tactic/CategoryTheory/Coherence/Basic.lean,Mathlib/Tactic/CategoryTheory/Coherence/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Coherence/Normalize.lean,Mathlib/Tactic/CategoryTheory/Coherence/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/CoherenceNew.lean,Mathlib/Tactic/CategoryTheory/Monoidal.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Basic.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,Mathlib/Tactic/Widget/StringDiagram.lean,lake-manifest.json,scripts/noshake.json,test/CategoryTheory/Bicategory.lean,test/CategoryTheory/Coherence.lean,test/CategoryTheory/CoherenceNew.lean,test/CategoryTheory/Monoidal.lean,test/CategoryTheory/Monoidal/Basic.lean,test/CategoryTheory/Monoidal/Normalize.lean,test/CategoryTheory/MonoidalComp.lean,test/StringDiagram.lean	35	n/a	['github-actions']	nobody	389-84549 1 year ago	unknown	unknown
6475	joneugster author:joneugster	refactor(LinearAlgebra/Span): replace ∙ with • as notation for `span R {x}`	Change the notation for `Submodule.span R {x}` from `R ∙ x` to the bullet `R • x`, which is also used for scalar multiplication. --- (this was an experiment originating from a [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/.2E.C2.B7.E2.AC.9D.20.5Brant.5D), I don't have a clear opinion if this is actually a desired thing to do...) Generally this works and Lean seems to do fine figuring out the difference between `r • x` and `R • x` (The former is scalar multiplication in an `R`-module `M`, the latter is the `Submodule R M` generated by `x`). Encountered a few regressions that should be considered (the first two might be also bugs that could be looked at independently): 1. `(· • ·)`, and general simple function syntax, does not work as notation for `HSMul.hSMul` anymore. For this reason, I introduced the notation `scoped` to minimise the effect of this. Now it's only a problem if you `open Span`. Note that `fun x₁ x₂ ↦ x₁ • x₂` works flawlessly all the time. 4. `change` and `convert` have troubles to deal with the two competing notations. `have := _; convert this` works. 5. `R • x - y` is not valid anymore and needs parentheses: `R • (x - y)`. I do think this actually helps readability, so I don't mind. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC merge-conflict label:t-algebra$	323/240	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Lie/Engel.lean,Mathlib/Algebra/Lie/Normalizer.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/InnerProductSpace/TwoDim.lean,Mathlib/Analysis/NormedSpace/ContinuousLinearMap.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Extension.lean,Mathlib/Analysis/NormedSpace/OperatorNorm.lean,Mathlib/Data/ZMod/Quotient.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/Basic.lean,Mathlib/Geometry/Euclidean/Inversion/Calculus.lean,Mathlib/Geometry/Euclidean/MongePoint.lean,Mathlib/Geometry/Euclidean/PerpBisector.lean,Mathlib/Geometry/Euclidean/Sphere/SecondInter.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace.lean,Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean,Mathlib/LinearAlgebra/BilinearForm.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/Dimension.lean,Mathlib/LinearAlgebra/FiniteDimensional.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/ProjectiveSpace/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/Quotient.lean,Mathlib/LinearAlgebra/SesquilinearForm.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/MeasureTheory/Integral/Periodic.lean,Mathlib/RingTheory/Coprime/Ideal.lean,Mathlib/RingTheory/Finiteness.lean,Mathlib/RingTheory/Ideal/AssociatedPrime.lean,Mathlib/RingTheory/Ideal/IdempotentFG.lean,Mathlib/RingTheory/Noetherian.lean,Mathlib/Topology/Instances/AddCircle.lean	42	3	['eric-wieser', 'joneugster', 'leanprover-bot']	nobody	388-62905 1 year ago	388-62905 1 year ago	0-0 0 seconds
7545	shuxuezhuyi author:shuxuezhuyi	feat: APIs of `Function.extend f g e'` when `f` is injective	We characterizes `range g`, `Injective g`, `Surjective g` and `Bijective g` in terms of `extend f g e'`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict awaiting-author	50/0	Mathlib.lean,Mathlib/Logic/Function/ApiForExtend.lean	2	1	['fpvandoorn']	nobody	387-78441 1 year ago	387-78441 1 year ago	32-30254 32 days
12632	urkud author:urkud	feat(List/OffDiag): new file	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict awaiting-author	184/3	Mathlib.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Enum.lean,Mathlib/Data/List/EraseIdx.lean,Mathlib/Data/List/OffDiag.lean	5	3	['eric-wieser', 'github-actions', 'urkud']	nobody	384-49256 1 year ago	384-49256 1 year ago	0-0 0 seconds
16658	adomani author:adomani	add tips file	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	test-ci merge-conflict awaiting-author WIP	51/508	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,scripts/Tips.lean	5	1	['github-actions']	nobody	384-20974 1 year ago	384-20974 1 year ago	0-0 0 seconds
14078	Ruben-VandeVelde author:Ruben-VandeVelde	feat(CI): continue after mk_all fails	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict awaiting-author	43/0	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,Mathlib/Data/Nat/Test.lean	5	2	['bryangingechen', 'github-actions']	nobody	384-1274 1 year ago	384-1274 1 year ago	0-0 0 seconds
11800	JADekker author:JADekker	feat : Define KappaLindelöf spaces	Define KappaLindelöf spaces by following the first one-third of the API for Lindelöf spaces. The remainder will be added in a future PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-topology merge-conflict please-adopt	301/2	Mathlib.lean,Mathlib/Topology/Compactness/KappaLindelof.lean,Mathlib/Topology/Compactness/Lindelof.lean	3	38	['ADedecker', 'JADekker', 'PatrickMassot', 'StevenClontz', 'adomani', 'github-actions', 'grunweg', 'kim-em', 'urkud']	nobody	382-78451 1 year ago	383-14026 1 year ago	119-10687 119 days
11283	hmonroe author:hmonroe	feat(ModelTheory/Satisfiability): define theory with independent sentence	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict WIP	8/0	Mathlib/ModelTheory/Satisfiability.lean	1	2	['fpvandoorn', 'hmonroe']	nobody	381-58228 1 year ago	381-58228 1 year ago	3-5240 3 days
16914	siddhartha-gadgil author:siddhartha-gadgil	Loogle syntax with non-reserved	This is PR mainly to test that loogle syntax does not break stuff downstream --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	4/4	lake-manifest.json,lakefile.lean	2	1	['github-actions']	nobody	379-46837 1 year ago	379-46837 1 year ago	0-14835 4 hours
10991	thorimur author:thorimur	feat: `tfae` block tactic	This PR introduces `tfae` block tactic syntax: ```lean tfae 1 → 2 := /- proof of `P₁ → P₂` -/ 2 → 3 := /- proof of `P₂ → P₃` -/ 3 → 1 := /- proof of `P₃ → P₁` -/ ``` Like the recent change to `tfae_have`, this syntax also supports all sorts of matching that `have` itself supports: ```lean tfae 2 → 3 \| h₂ => /- proof of `P₃` -/ 3 → 1 -- given `P₁ := ∀(a : A), (b : B), (c : C), X`: \| h₃, a, b, c => /- proof of `X` -/ ⟨h_mp, h_mpr⟩ : 1 ↔ 2 := /- proof of `P₁ ↔ P₂`; puts `h_mp : P₁ → P₂`, `h_mpr : P₂ → P₁` in the lctx -/ ``` This initial implementation is currently very simple, and relies on `tfae_have` and `tfae_finish`. Although we intend to migrate away from that syntax, this PR does not remove support for it or deprecate `tfae_have`/`tfae_finish` in any way; migration (but not deprecation) is done in #11003. --- - [ ] depends on: #10653 - [x] depends on: #10994 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict modifies-tactic-syntax WIP	392/124	Mathlib/Tactic/TFAE.lean,scripts/noshake.json,test/tfae.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	378-70491 1 year ago	378-70491 1 year ago	0-0 0 seconds
16464	Parcly-Taxel author:Parcly-Taxel	chore: deprecate `Nat.(case_)strong_induction_on`	…in favour of the now-renamed `Nat.(case)strongInductionOn` in core.	tech debt merge-conflict	54/56	Archive/Imo/Imo1981Q3.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Hofer.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Derangements/Finite.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/SetFamily/AhlswedeZhang.lean,Mathlib/Computability/Primrec.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Nat/Defs.lean,Mathlib/Data/Nat/Digits.lean,Mathlib/Data/Nat/Log.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/LinearAlgebra/Eigenspace/Triangularizable.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/NumberTheory/BernoulliPolynomials.lean,Mathlib/NumberTheory/DiophantineApproximation.lean,Mathlib/NumberTheory/Pell.lean,Mathlib/NumberTheory/Primorial.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/RingTheory/Adjoin/PowerBasis.lean,Mathlib/RingTheory/LittleWedderburn.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean,Mathlib/RingTheory/Polynomial/Eisenstein/IsIntegral.lean,Mathlib/RingTheory/Polynomial/Nilpotent.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/QuotientNilpotent.lean,Mathlib/RingTheory/WittVector/Defs.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/StructurePolynomial.lean,Mathlib/SetTheory/Surreal/Dyadic.lean,Mathlib/Topology/Metrizable/Uniformity.lean	43	13	['Parcly-Taxel', 'b-mehta', 'github-actions', 'jcommelin']	nobody	378-32136 1 year ago	378-32136 1 year ago	8-1989 8 days
8118	iwilare author:iwilare	feat(CategoryTheory): add dinatural transformations	A starting point to define [dinatural transformations](https://ncatlab.org/nlab/show/dinatural+transformation). This is my first PR so style comments and improvements are very welcome! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict awaiting-author	147/7	Mathlib.lean,Mathlib/CategoryTheory/DinatTrans.lean,Mathlib/CategoryTheory/Functor/Category.lean,Mathlib/CategoryTheory/Products/Bifunctor.lean	4	49	['Shamrock-Frost', 'github-actions', 'iwilare', 'joelriou']	Shamrock-Frost assignee:Shamrock-Frost	374-69123 1 year ago	374-69124 1 year ago	21-9462 21 days
17171	FR-vdash-bot author:FR-vdash-bot	test extends carrier and property	--- We need https://github.com/leanprover/lean4/issues/2666 ... [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	433/309	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/Algebra/Field/Subfield.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/MulOpposite.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/MulOpposite.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Units.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/MulOpposite.lean,Mathlib/Algebra/Ring/Subsemiring/Order.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/Algebra/Star/Subsemiring.lean,Mathlib/Data/Complex/Module.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Deprecated/Subfield.lean,Mathlib/Deprecated/Subgroup.lean,Mathlib/Deprecated/Submonoid.lean,Mathlib/Deprecated/Subring.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/DoubleCoset.lean,Mathlib/GroupTheory/Finiteness.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/SetTheory/Cardinal/Subfield.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/OpenSubgroup.lean	42	1	['github-actions']	nobody	370-27816 1 year ago	370-27816 1 year ago	0-0 0 seconds
7516	ADedecker author:ADedecker	perf: use `abbrev` to prevent unifying useless data	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	4/3	Mathlib/Topology/ContinuousFunction/Bounded.lean	1	3	['ADedecker', 'leanprover-bot', 'mattrobball']	nobody	368-85876 1 year ago	368-85876 1 year ago	0-0 0 seconds
17127	FR-vdash-bot author:FR-vdash-bot	chore: remove global `Quotient.mk` `⟦·⟧` notation	--- Merge this PR when we are ready to migrate to `QuotLike` API (#16421). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	137/2	Counterexamples/Pseudoelement.lean,Mathlib/Algebra/Associated/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Order/CauSeq/Completion.lean,Mathlib/Algebra/Quandle.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Product.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/CategoryTheory/Abelian/Pseudoelements.lean,Mathlib/CategoryTheory/Limits/Shapes/SingleObj.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Fintype/List.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/QPF/Multivariate/Constructions/Fix.lean,Mathlib/Data/QPF/Univariate/Basic.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Set/Finite.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/ModelTheory/Quotients.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/RepresentationTheory/Action/Concrete.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Ordinal.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/Birthday.lean,Mathlib/SetTheory/Game/Impartial.lean,Mathlib/SetTheory/Game/Ordinal.lean,Mathlib/SetTheory/Game/State.lean,Mathlib/SetTheory/Lists.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Surreal/Basic.lean,Mathlib/SetTheory/Surreal/Dyadic.lean,Mathlib/SetTheory/Surreal/Multiplication.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Rank.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Homotopy/Product.lean,Mathlib/Topology/MetricSpace/GromovHausdorff.lean,Mathlib/Topology/UniformSpace/Separation.lean,test/interactiveUnfold.lean	68	1	['github-actions']	nobody	368-80919 1 year ago	368-80919 1 year ago	4-72805 4 days
14712	FR-vdash-bot author:FR-vdash-bot	perf: change instance priority and order about `OfNat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra merge-conflict delegated label:t-algebra$	49/20	Mathlib/Algebra/Group/Nat.lean,Mathlib/Algebra/Group/ZeroOne.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Data/BitVec.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Data/UInt.lean,Mathlib/NumberTheory/ArithmeticFunction.lean	9	24	['FR-vdash-bot', 'MichaelStollBayreuth', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors']	nobody	362-57472 11 months ago	364-80948 11 months ago	20-15089 20 days
11500	mcdoll author:mcdoll	refactor(Topology/Algebra/Module/WeakDual): Clean up	- Move `Dual` and `dualPairing` lower in the import-hierachy - deduplicate `dualPairing` - Bundle continuity statements to `CLM`s. - Make `WeakDual` and `WeakSpace` reducible - Remove `refine'` in favor of `refine` --- Cleaning up `Analysis/NormedSpace/WeakDual` will be done in a second PR [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict awaiting-author	227/179	Mathlib.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/NormedSpace/Dual.lean,Mathlib/Analysis/NormedSpace/WeakDual.lean,Mathlib/Analysis/VonNeumannAlgebra/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/Dual.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,docs/overview.yaml,docs/undergrad.yaml	15	14	['ADedecker', 'grunweg', 'j-loreaux', 'kkytola', 'mathlib-bors', 'mcdoll']	nobody	360-79415 11 months ago	360-79415 11 months ago	46-5572 46 days
5995	FR-vdash-bot author:FR-vdash-bot	feat: add APIs about `Quotient.choice`	Some docs in this PR refer to the definition in #5576. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data RFC merge-conflict awaiting-author	76/6	Mathlib/Data/Quot.lean	1	3	['FR-vdash-bot', 'YaelDillies', 'gebner']	eric-wieser assignee:eric-wieser	359-39661 11 months ago	359-39661 11 months ago	285-35716 285 days
8029	alreadydone author:alreadydone	refactor: Homotopy between Functions not ContinuousMaps	This allows talking about homotopies without needing to supply proofs of continuity for the two ends. This for example simplifies the definition of H-spaces. Of course, if a homotopy exists between two functions, those two functions are automatically continuous because they are restrictions of the homotopy (which is continuous) to subspaces. `Homotopy.refl` still needs a continuous map as input, and `Homotopic` is only an equivalence relation when restricted to ContinuousMap. --- TODO: fix docstrings [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology RFC merge-conflict	246/250	Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/Topology/Homotopy/Basic.lean,Mathlib/Topology/Homotopy/Contractible.lean,Mathlib/Topology/Homotopy/Equiv.lean,Mathlib/Topology/Homotopy/HSpaces.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Homotopy/Product.lean	8	3	['alreadydone', 'urkud']	nobody	359-23324 11 months ago	451-46983 1 year ago	9-20043 9 days
14619	Command-Master author:Command-Master	chore: Merge `Trunc` to `Squash`	Remove `Trunc` and use `Squash` instead --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict WIP	197/211	Mathlib/CategoryTheory/EpiMono.lean,Mathlib/CategoryTheory/Preadditive/Biproducts.lean,Mathlib/Data/DFinsupp/Basic.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Fintype/Option.lean,Mathlib/Data/Fintype/Perm.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Semiquot.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/Logic/Equiv/List.lean	13	3	['Command-Master', 'github-actions', 'vihdzp']	nobody	356-72002 11 months ago	441-43746 1 year ago	0-0 0 seconds
13156	erdOne author:erdOne	refactor(Algebra/Module/LocalizedModule): Redefine `LocalizedModule` in terms of `OreLocalization`.	--- - [x] depends on: #13151 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	519/628	Mathlib.lean,Mathlib/Algebra/Module/LocalizedModule.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Module.lean,Mathlib/RingTheory/OreLocalization/Ring.lean	8	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball']	nobody	354-46801 11 months ago	354-46801 11 months ago	51-84473 51 days
16348	urkud author:urkud	refactor(Topology): require `LinearOrder` with `OrderTopology`	While the definition formally makes sense for a preorder, this topology is usually not the right one for a non-linear order (e.g., `Real × Real`). See [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Open.20Ioi) --- This PR doesn't cleanup any API, I'm going to do it in a later PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-topology merge-conflict awaiting-author	33/46	Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Topology/Algebra/Order/LiminfLimsup.lean,Mathlib/Topology/Instances/Sign.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Order/Filter.lean,Mathlib/Topology/Order/MonotoneContinuity.lean	6	10	['YaelDillies', 'github-actions', 'jcommelin', 'urkud']	nobody	354-46425 11 months ago	354-46425 11 months ago	3-83049 3 days
16984	hrmacbeth author:hrmacbeth	feat: extend `module` tactic to handle multiple rings, not strictly ordered by inclusion	The `module` tactic currently in Mathlib handles scalars from multiple rings, but only if for any two rings `R` and `S` which appear, either `R` is an algebra over `S` or vice versa. This PR extends the tactic by providing a syntax `module T`, which will handle scalars from any ring `R` which `T` is an algebra over. For example, ```lean example : (2:ℤ) • x = (2:ℚ≥0) • x := by module ``` fails since `ℤ` is not a `ℚ≥0`-algebra and `ℚ≥0` is not a `ℤ`-algebra, but ```lean example : (2:ℤ) • x = (2:ℚ≥0) • x := by module ℚ ``` works since `ℚ` is both a `ℤ`-algebra and a `ℚ≥0`-algebra. This PR is a quick proof-of-concept implementation, just to record the desired approach and tactic syntax. It should not be merged as-is. It has with a lot of code duplication and should be rewritten more efficiently (for example, `parse` and `parseEnsuringType` should be merged to a single function, and the `some`/`none` cases in `matchScalarsAux` should be merged to a uniform treatment) before being considered for merging to Mathlib. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	158/35	Mathlib/Tactic/Module.lean,test/module.lean	2	1	['github-actions']	nobody	350-68865 11 months ago	350-68865 11 months ago	0-0 0 seconds
12414	adomani author:adomani	test: lint and unlint `·`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	64/14	Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Tactic/Linter/Multigoal.lean,test/Multigoal.lean	4	4	['adomani', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	346-44650 11 months ago	346-44650 11 months ago	0-0 0 seconds
16925	YnirPaz author:YnirPaz	feat(SetTheory/Cardinal/Cofinality): aleph index of singular cardinal has infinite cofinality	Prove `Ordinal.aleph0_le_cof_of_not_isRegular`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict WIP	6/0	Mathlib/SetTheory/Cardinal/Cofinality.lean	1	4	['YnirPaz', 'github-actions', 'vihdzp']	nobody	345-16232 11 months ago	345-16232 11 months ago	2-57220 2 days
16647	eric-wieser author:eric-wieser	feat: partitions of lists	The length of this list is the bell numbers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-combinatorics merge-conflict	311/0	Mathlib.lean,Mathlib/Data/List/Partition.lean	2	1	['github-actions']	nobody	343-65124 11 months ago	343-65124 11 months ago	0-0 0 seconds
9605	davikrehalt author:davikrehalt	feat(Data/Finset & List): Add Lemmas for Sorting and Filtering	This PR includes several useful lemmas to the Data/Finset and Data/List modules in Lean's mathlib: 1. `toFinset_filter` (List): Shows that filtering commutes with toFinset. 2. `toFinset_is_singleton_implies_replicate` (List): Shows a list with a singleton toFinset is a List.replicate. 3. `filter_sort_commute` (Finset): Sorting and filtering can be interchanged in Finsets. 4. `Sorted.filter` (List): A sorted list stays sorted after filtering. 5. `Sorted.append_largest` (List): Appending the largest element keeps a list sorted. 6. `sort_monotone_map` (Finset): Relates sorting of a Finset after mapping to sorting of a list. 7. `sort_insert_largest` (Finset): Sorting a Finset with an inserted largest element. 8. `sort_range` (Finset): Sorting a range in a Finset equals the corresponding range list. 9. ~~`filter_eval_true` (List): Filtering a list with a predicate always true keeps the list unchanged.~~ 10. ~~`filter_eval_false` (List): Filtering with an always-false predicate gives an empty list.~~ 11. ~~`pairwise_concat` (List): Iff condition for Pairwise relation in concatenated lists (similar to pairwise_join).~~ 12. `list_map_toFinset` (Finset): toFinset commutes with map under injection --- - [x] depends on: #15952 This is my first PR to mathlib, so I'm not too familiar with etiquette's and more specifically there are two proofs in the PR which uses aesop, and I am not sure if it's frowned upon. I kept the aesop in there for now as I couldn't construct very short proofs otherwise. The sort_range function proof was suggested in https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Computing.20Finset.20sort.20of.20Finset.20range/near/410346731 by Ruben Van de Velde. Thanks for your time for improving this PR.	t-data new-contributor merge-conflict please-adopt awaiting-author	71/0	Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Sort.lean	4	30	['YaelDillies', 'davikrehalt', 'eric-wieser', 'github-actions', 'jcommelin', 'leanprover-community-mathlib4-bot', 'urkud', 'vihdzp']	YaelDillies assignee:YaelDillies	338-19419 11 months ago	364-74610 11 months ago	12-48560 12 days
5364	thorimur author:thorimur	feat: `wlog ... replacing`	This allows hypotheses to be removed from the set of generalized hypotheses. E.g. `wlog h : P replacing h'` will remove `h'` from the hypotheses of the type of `this` and from the context of the goal that will suppose `h`. See [zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/wlog.20.2E.2E.2E.20replacing.20.2E.2E.2E.3F). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	125/18	Mathlib/Tactic/WLOG.lean,test/wlog.lean	2	2	['thorimur', 'urkud']	nobody	334-6076 11 months ago	334-6076 11 months ago	0-0 0 seconds
9654	urkud author:urkud	feat: add `@[mk_eq]` version of `@[mk_iff]`	The new attribute generates theorems like ```lean List.chain_eq : @List.Chain = fun {α} R a a_1 => a_1 = [] ∨ ∃ b l, R a b ∧ List.Chain R b l ∧ a_1 = b :: l ``` and is useful to rewrite in a theorem that argues about the properties of an unapplied inductive predicate. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author	63/9	Mathlib/Lean/Meta.lean,Mathlib/Tactic/MkIffOfInductiveProp.lean,test/MkIffOfInductive.lean	3	6	['Vierkantor', 'github-actions', 'urkud']	nobody	334-5830 11 months ago	334-5830 11 months ago	25-70815 25 days
16704	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Mathlib.Data.Ordering.Dickson): Dickson orders	Dickson orders are a particular class of well founded orders characterized by the fact that every nonempty set has finitely many minimal elements. They appear in the classical theory of Groebner bases because it is easier to prove that some sets are well founded using this property. WiP. In the `tfae` function, property 2 is exactly `Set.PartiallyWellOrderedOn`, so the PR should be rewritten so as to use that property (and not define `IsDickson`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict WIP	324/0	Mathlib.lean,Mathlib/Data/Ordering/Dickson.lean,scripts/noshake.json	3	9	['AntoineChambert-Loir', 'b-mehta', 'github-actions']	nobody	333-70787 10 months ago	333-70787 10 months ago	2-84515 2 days
16355	Ruben-VandeVelde author:Ruben-VandeVelde	feat: odd_{add,sub}_one	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory merge-conflict awaiting-author label:t-algebra$	12/0	Mathlib/Algebra/Ring/Int.lean,Mathlib/Algebra/Ring/Parity.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'urkud']	nobody	333-18584 10 months ago	333-18584 10 months ago	0-57608 16 hours
8479	alexjbest author:alexjbest	feat: use leaff in CI	[Leaff](https://github.com/alexjbest/leaff) is an experimental lean-diff tool, this PR is to experiment with adding it as a CI step. --- I'm not sure yet if it is best to have this always run or only run on request (like bench). If it is always run should it post a comment or simply leave its output it the actions log (maybe as a summary object) the current iteration runs and updates a sticky comment with the latest result [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author WIP	340/0	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml	4	11	['alexjbest', 'github-actions', 'grunweg', 'kim-em', 'mathlib-bors', 'urkud']	nobody	333-9338 10 months ago	333-9352 10 months ago	0-0 0 seconds
8638	alreadydone author:alreadydone	refactor: noncommutative tensor product	Co-authored-by: Eric Wieser Co-authored-by: Jujian Zhang This draft PR currently only generalizes a single file TensorProduct.lean; it allows TensorProduct to be taken over a non-commutative ring. Most of the declarations in TensorProduct.lean are now generalized to the non-commutative setting, and very few are deleted (their commutative version will be restored in another file). Next plans: + Change the namespace in TensorProduct.lean from TensorProduct to NonCommTensorProduct, and remove the #aligns + I plan to use the same notation for the non-commutative and the commutative TensorProduct, and the user will need to `open scoped` different namespaces to use the one of their choice. + Start a new file TensorProduct/Comm.lean, copy the content of TensorProduct.lean on master into it, change the definition TensorProduct to be semi-reducibly defeq to NonCommTensorProduct (in order to support more instances or unify non-defeq instances that become prop-eq in the commutative setting, e.g. we've chosen the R-action on a tensor product over commutative R to come from the left factor, since the action from the right factor is the same), and reuse the NonComm constructions as much as possible. We then change all files that imports TensorProduct.lean to import TensorProduct/Comm.lean instead. Once we do that, mathlib would compile and this PR would be complete. We can gradually generalize other files about tensor products this way. In this PR: `TensorProduct.map` is now defined in terms of `lTensor` and `rTensor` rather than the other way around, which requires moving `lTensor` and `rTensor` up from their original location. The definition of `rid` also becomes more challenging and is moved down. An evident observation is that actions on the domain of AddMonoidHom / LinearMap is really natural in the context of tensor products and Hom-tensor adjunction (`TensorProduct.lift`), not the default actions on the codomain. For example, it allows us to write the "balanced biadditive monoid homs" in #8536 as simply `N →ₗ[R] M →+ P` (where the right R-action on M turns into the left action on `M →+ P`). For this reason, we disable the default instances `AddMonoidHom/LinearMap.module` at the beginning of the file and enable the `AddMonoidHom/LinearMap.domModule` instances instead. (The action on the codomain would be necessary for the non-commutative version of [TensorProduct.lTensorHomToHomLTensor](https://leanprover-community.github.io/mathlib4_docs/Mathlib/LinearAlgebra/TensorProduct.html#TensorProduct.lTensorHomToHomLTensor) (in the form of `P ⊗[R] (M →+ Q) →+ M →+ P ⊗[R] Q`), but I've deleted it for now.) We register actions on the left factor of a tensor product as the default instance, but we also talk about actions on the right factor (`attribute [local instance] rightModule`). The Tensor-Hom adjunction #8495 is now `uncurryEquiv` in this PR. #8519 is now included in this PR and #8584 is now called `lift` in this PR. `CharacterModule.homEquiv` in #8559 can be obtained by combining `liftEquiv` and `flipMop` in this PR (except for a mop). To refactor the commutative tensor product, we'd need to transfer many R^mop-action to R-action and R^mop-LinearMaps to R-LinearMaps, which can be achieved via `Module.compHom` and `LinearMap.restrictScalars` (requires `LinearMap.CompatibleSMul` instance) given `RingEquiv.toOpposite`. `LinearMap.characterfy` and `CharacterModule.cong` could be obtained from `LinearMap.compAddMonoidHom` in this PR. TODO: + Move delarations that belong to other files. + Change docstrings that are no longer accurate. + Fix some argument order to be more natural. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	793/676	Mathlib/Algebra/Module/LinearMap.lean,Mathlib/GroupTheory/GroupAction/DomAct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct.lean	3	6	['alreadydone', 'eric-wieser', 'grhkm21', 'jjaassoonn']	nobody	332-44797 10 months ago	451-46983 1 year ago	0-0 0 seconds
14598	Command-Master author:Command-Master	chore: add typeclasses to unify various `add_top`, `add_eq_top`, etc.	Add the four typeclasses `IsTopAbsorbing`, `IsBotAbsorbing`, `NoTopSum`, `NoBotSum`, as additive equivalents for `MulZeroClass` and `NoZeroDivisors`. Add instances of these for `ENNReal`, `WithTop α`, `WithBot α`, `PUnit`, `EReal`, `PartENat`, `Measure`, `Interval` and `Filter`. Also split `Algebra/Order/AddGroupWithTop` to `Algebra/Order/Group/WithTop` and `Algebra/Order/Monoid/WithTop` --- Previous usages of lemmas with quantified names like `WithTop.add_top` have to be changed to just `add_top`. `add_lt_top` is `@[simp]`, in accordance with `ENNReal.add_lt_top` being `@[simp]`. This affects `WithTop.add_lt_top` which previously hadn't been `@[simp]`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order t-algebra merge-conflict label:t-algebra$	264/195	Archive/Wiedijk100Theorems/BallotProblem.lean,Mathlib.lean,Mathlib/Algebra/Order/Group/WithTop.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/PUnitInstances/Order.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Analytic/Meromorphic.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/NormedSpace/ENorm.lean,Mathlib/Analysis/SpecialFunctions/JapaneseBracket.lean,Mathlib/Analysis/SpecialFunctions/Log/ENNRealLog.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Nat/WithBot.lean,Mathlib/Data/Real/EReal.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Decomposition/Lebesgue.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSpace.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean,Mathlib/MeasureTheory/Integral/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Martingale/Convergence.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/UniqueFactorizationDomain.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/MetricSpace/Lipschitz.lean	57	30	['Command-Master', 'YaelDillies', 'github-actions']	nobody	331-76385 10 months ago	331-76385 10 months ago	7-45599 7 days
12778	MichaelStollBayreuth author:MichaelStollBayreuth	perf: decouple algebraic and order hierarchies in type class search	Based on the experience gained with [#12680](https://github.com/leanprover-community/mathlib4/pull/12680), this attempts to decouple the algebraic and order hierarchies in type class search. * We lower the priorities of instances like `OrderedSemiring.toSemiring` (which are generated by the `extends` clause with default priority 1000) to 50. * Additionally, we make the default priority available via `open scoped AlgebraOrderInstances` and use that where appropriate. Motivation: Looking at instance synthesization traces, it appears that when (e.g.) presented with the goal to find a `Semiring` instance, the algorithm frequently goes down a rabbit hole trying and failing to find order instances. This seems to be caused by the presence of instances like `OrderedSemiring.toSemiring` with default priority, which are tried early in the search, but lead nowhere (after a fairly long time). These instances are created by declarations of the form ```lean class OrderedSemiring (α : Type u) extends Semiring α, OrderedAddCommMonoid α where ... ``` which automatically sets up (among other things) an instance `OrderedSemiring.toSemiring` with default piority. It appears that these instances cannot be removed completely (only locally in a module), so the next best solution is to make them low priority (which is possible also for downstream modules). To provide for situations where these instances are desired, we put a default priority version in the scope `AlgebraOrderInstances`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-order t-algebra merge-conflict label:t-algebra$	306/27	Mathlib/Algebra/Algebra/Subalgebra/Order.lean,Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/Submodule/Order.lean,Mathlib/Algebra/Order/AbsoluteValue.lean,Mathlib/Algebra/Order/Algebra.lean,Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/BigOperators/Group/Finset.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/BigOperators/Group/Multiset.lean,Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/BigOperators/Ring/List.lean,Mathlib/Algebra/Order/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Field/Pi.lean,Mathlib/Algebra/Order/Floor.lean,Mathlib/Algebra/Order/Floor/Div.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/Units.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Interval/Set/Instances.lean,Mathlib/Algebra/Order/Invertible.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Module/Algebra.lean,Mathlib/Algebra/Order/Module/Defs.lean,Mathlib/Algebra/Order/Module/Pointwise.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Prod.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Order/Positive/Field.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/InjSurj.lean,Mathlib/Algebra/Order/Ring/Pow.lean,Mathlib/Algebra/Order/Sub/WithTop.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Analysis/Convex/Cone/Closure.lean,Mathlib/Analysis/Convex/Cone/Pointed.lean,Mathlib/Analysis/Convex/Cone/Proper.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convex/Extrema.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/GaugeRescale.lean,Mathlib/Analysis/Convex/Hull.lean,Mathlib/Analysis/Convex/Join.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/SpecificFunctions/Pow.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/Convex/Strict.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Polynomials.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Optimization/ValuedCSP.lean,Mathlib/Combinatorics/Pigeonhole.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/DFinsupp/Multiset.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/MulAntidiagonal.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Int/Log.lean,Mathlib/Data/Multiset/Antidiagonal.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Nat/Cast/Field.lean,Mathlib/Data/Nat/Cast/Order/Basic.lean,Mathlib/Data/Nat/Choose/Bounds.lean,Mathlib/Data/PNat/Factors.lean,Mathlib/Data/Rat/Denumerable.lean,Mathlib/Data/Set/Pointwise/Interval.lean	135	34	['MichaelStollBayreuth', 'YaelDillies', 'github-actions', 'leanprover-bot']	nobody	331-75288 10 months ago	331-75288 10 months ago	18-19513 18 days
18636	adomani author:adomani	Test/latest import report dev	This PR is a test accompanying #18631. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict	147/0	.github/workflows/latest_import.yml,lakefile.lean	2	1	['github-actions']	nobody	330-63656 10 months ago	330-63656 10 months ago	0-0 0 seconds
16885	metinersin author:metinersin	feat(ModelTheory/Complexity): define literals	Defines `FirstOrder.Language.BoundedFormula.IsLiteral` and `FirstOrder.Language.BoundedFormula.simpleNot` - an auxiliary operation that takes the negation of a formula and does some simplification. --- - [x] depends on: #16800 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict awaiting-author	148/5	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	4	20	['YaelDillies', 'awainverse', 'github-actions', 'mathlib4-dependent-issues-bot', 'metinersin']	nobody	329-32506 10 months ago	329-32506 10 months ago	0-19926 5 hours
9341	winstonyin author:winstonyin	feat: Naturality of integral curves	Let `v` and `v'` be sections of the tangent bundle of manifolds `M` and `M'`, respectively, and let `f : M → M'` be a differentiable map. Then `f` maps integral curves of `v` to integral curves of `v'` if and only if `v` and `v'` are `f`-related. - [x] depends on: #8483 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict awaiting-author	45/0	Mathlib/Geometry/Manifold/IntegralCurve.lean,Mathlib/Topology/Algebra/Module/Basic.lean	2	n/a	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot', 'winstonyin']	nobody	325-84329 10 months ago	unknown	unknown
13248	hcWang942 author:hcWang942	feat: basic concepts of auction theory	## Description Formalise some core concepts and results in auction theory: this includes definitions for first-price and second-price auctions, as well as several fundamental results and helping lemmas. This is the very first PR of the project formalizing core concepts and results in auction theory. Our group is working on more contributions on the formalization of game theory prefix. Co-authored-by: Ma Jiajun ## Reference Roughgarden, Tim. *Twenty Lectures on Algorithmic Game Theory*. Cambridge University Press, 2020. [Link](https://www.cambridge.org/core/books/twenty-lectures-on-algorithmic-game-theory/A9D9427C8F43E7DAEF8C702755B6D72B) --- - [x] Will depend on #14163 once that PR is merged. The Fintype lemmas introduced by this PR have been added in that PR and will be removed from here once that PR gets merged ## Current plan for formalization of Game Theory The current plan for the formalizing of Game Theory include: #### 1. Auction Theory. 🎉 _(200+ lines, this PR)_ - Essential definitions of Sealed-bid auction, First-price auction and Second-price auction. - First-price auction has no dominant strategy. - Second-price auction has dominant strategy. (Second-price auction is DSIC) #### 2. Mechanism design & Myerson's Lemma. 🎉 (400+ lines, pending for modification to Mathlib Standard) - Mechanism design An allocation rule is implementable if there exists - Dominant Strategy Incentive Compatible (DSIC) payment rule - An allocation rule is monotone if for every bidder’s gain is nondecreasing w.r.t. her/his bid - Myerson's Lemma Implementable ⇔ Monotone In the above case, the DSIC payment rule is unique. #### 3. von Neumann‘s Minimax Theorem. 🎉 (800+ lines, pending for modification to Mathlib Standard) - Equilibrium in zero sum game - Formalization strategy: via Loomis’s theorem. #### 4. Nash Equilibrium. 🎉 (pending for modification to Mathlib Standard) #### 5. Brouwer fixed-point theorem. (Work in Progress) #### 6. More Mechanism design. (Planning)	new-contributor t-logic merge-conflict awaiting-author	204/0	Mathlib.lean,Mathlib/GameTheory/Auction/Basic.lean,docs/references.bib	3	148	['Shreyas4991', 'YaelDillies', 'eric-wieser', 'faenuccio', 'github-actions', 'grunweg', 'hcWang942', 'tb65536', 'urkud', 'vihdzp']	hcWang942 assignee:hcWang942	324-71338 10 months ago	unknown	unknown
17675	FR-vdash-bot author:FR-vdash-bot	perf: do not search algebraic hierarchy when searching `FunLike` hierarchy	--- Unification is still very slow. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra merge-conflict label:t-algebra$	144/4	Mathlib.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/Rat.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Equiv.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Util/SetSynthOrder.lean,MathlibTest/TCSynth.lean,scripts/noshake.json	24	5	['FR-vdash-bot', 'github-actions', 'leanprover-bot']	nobody	324-46471 10 months ago	324-46471 10 months ago	0-0 0 seconds
9344	erdOne author:erdOne	feat: Add `AddGroup.FG` -> `Module.Finite ℤ` as instances	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	4/0	Mathlib/RingTheory/Finiteness.lean	1	4	['alreadydone', 'erdOne', 'leanprover-bot']	nobody	323-55731 10 months ago	323-55731 10 months ago	0-0 0 seconds
12133	ADedecker author:ADedecker	feat: generalize instIsLowerProd to arbitrary products	Also change a bit the proof of the product case to match my own taste, feel free to tell if you prefer the old one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-topology merge-conflict awaiting-author	34/14	Mathlib/Topology/Constructions.lean,Mathlib/Topology/Order/LowerUpperTopology.lean	2	13	['Ruben-VandeVelde', 'TwoFX', 'github-actions', 'jcommelin', 'mans0954', 'mathlib-bors', 'riccardobrasca']	nobody	322-65485 10 months ago	322-65485 10 months ago	63-69206 63 days
16637	FR-vdash-bot author:FR-vdash-bot	perf: reorder `extends` of `(Add)Monoid`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	46/51	Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Ring/SumsOfSquares.lean,Mathlib/CategoryTheory/Preadditive/FunctorCategory.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean	20	3	['FR-vdash-bot', 'github-actions', 'leanprover-bot']	nobody	322-64723 10 months ago	322-64723 10 months ago	1-49655 1 day
18765	FR-vdash-bot author:FR-vdash-bot	chore: changing `outParam` of `MulActionSemiHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	60/34	Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Category/ModuleCat/Limits.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/GroupTheory/GroupAction/Hom.lean	4	4	['FR-vdash-bot', 'github-actions', 'leanprover-bot']	nobody	322-20984 10 months ago	322-20984 10 months ago	0-0 0 seconds
14739	urkud author:urkud	feat(Measure): add `gcongr` lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict awaiting-author WIP help-wanted	12/8	Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/Probability/Kernel/Disintegration/Density.lean	5	3	['github-actions', 'kim-em', 'urkud']	nobody	321-64419 10 months ago	321-64419 10 months ago	0-66587 18 hours
15822	kmill author:kmill	feat: greedy colorings of finite graphs	Proves that the greedy coloring only takes `G.maxDegree + 1` colors. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict	159/0	Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean	1	1	['github-actions']	nobody	319-46177 10 months ago	319-46177 10 months ago	0-0 0 seconds
8661	joelriou author:joelriou	feat(CategoryTheory/Sites): descent of sheaves	In this PR, it is shown that the category of sheaves on a site `(C, J)` identifies as a full subcategory of a category of families of sheaves equipped with a descent data (for a family of objects which cover the final object). Under suitable conditions, it shall be shown that this is an equivalence of categories (TODO). --- This shall be split in small PRs later. - [x] depends on: #8622 - [x] depends on: #8632 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	1396/26	Mathlib.lean,Mathlib/CategoryTheory/Over.lean,Mathlib/CategoryTheory/Sites/CoverPreserving.lean,Mathlib/CategoryTheory/Sites/Descent.lean,Mathlib/CategoryTheory/Sites/EqualizerSheafCondition.lean,Mathlib/CategoryTheory/Sites/InducedTopology.lean,Mathlib/CategoryTheory/Sites/ObjectsCoverTop.lean,Mathlib/CategoryTheory/Sites/Over.lean,Mathlib/CategoryTheory/Sites/SheafHom.lean,Mathlib/CategoryTheory/Sites/Sieves.lean	10	3	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	319-41705 10 months ago	612-64178 1 year ago	0-0 0 seconds
19055	JLimperg author:JLimperg	Test precompilation (batteries + aesop) again		merge-conflict	9/8	lake-manifest.json,lakefile.lean	2	5	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	319-23348 10 months ago	319-23348 10 months ago	0-0 0 seconds
10476	shuxuezhuyi author:shuxuezhuyi	feat(Topology/UniformSpace): define uniform preordered space	We define the semi-uniform structure and the uniform preordered space. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict awaiting-author	94/0	Mathlib.lean,Mathlib/Topology/UniformSpace/UniformOrder.lean,docs/references.bib	3	2	['shuxuezhuyi']	nobody	318-28359 10 months ago	318-28359 10 months ago	10-33091 10 days
17623	FR-vdash-bot author:FR-vdash-bot	feat(Algebra/Order/GroupWithZero/Unbundled): add some lemmas	Some lemmas in `Algebra.Order.GroupWithZero.Unbundled` have incorrect or unsatisfactory names, or assumptions that can be omitted using `ZeroLEOneClass`. The lemmas added in this PR are versions of existing lemmas that use the correct or better name or `ZeroLEOneClass` to omit an assumption. The original lemmas will be deprecated in #17593. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `mul_le_one_left₀` \| `Left.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_le_of_lt_left₀` (`0 ≤ ·` version) / `mul_lt_one_of_le_of_lt_of_pos_left` \| `Left.mul_lt_of_le_of_lt_one_of_pos` \| \| `mul_lt_one_of_lt_of_le_left₀` \| `Left.mul_lt_of_lt_of_le_one_of_nonneg` \| \| `mul_le_one_right₀` \| `Right.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_lt_of_le_right₀` (`0 ≤ ·` version) / `mul_lt_one_of_lt_of_le_of_pos_right` \| `Right.mul_lt_one_of_lt_of_le_of_pos` \| \| `mul_lt_one_of_le_of_lt_right₀` \| `Right.mul_lt_one_of_le_of_lt_of_nonneg` \| The following lemmas use `ZeroLEOneClass`. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `(Left.)one_le_mul₀` \| `Left.one_le_mul_of_le_of_le` \| \| `Left.one_lt_mul_of_le_of_lt₀` \| `Left.one_lt_mul_of_le_of_lt_of_pos` \| \| `Left.one_lt_mul_of_lt_of_le₀` \| `Left.lt_mul_of_lt_of_one_le_of_nonneg` / `one_lt_mul_of_lt_of_le` (still there) \| \| `(Left.)one_lt_mul₀` \| \| \| `Right.one_le_mul₀` \| `Right.one_le_mul_of_le_of_le` \| \| `Right.one_lt_mul_of_lt_of_le₀` \| `Right.one_lt_mul_of_lt_of_le_of_pos` \| \| `Right.one_lt_mul_of_le_of_lt₀` \| `Right.one_lt_mul_of_le_of_lt_of_nonneg` / `one_lt_mul_of_le_of_lt` (still there) / `one_lt_mul` (still there) \| \| `Right.one_lt_mul₀` \| `Right.one_lt_mul_of_lt_of_lt` \| --- Split from #17593. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-order t-algebra merge-conflict label:t-algebra$	146/44	Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean	2	11	['FR-vdash-bot', 'YaelDillies', 'github-actions', 'j-loreaux']	nobody	317-51701 10 months ago	317-51701 10 months ago	33-64877 33 days
18969	alreadydone author:alreadydone	chore: generalize Module to NonUnitalSemiring	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	94/75	Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/End.lean,Mathlib/Algebra/Group/Action/Prod.lean,Mathlib/Algebra/Group/Action/TypeTags.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/Submodule/Defs.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/GroupTheory/CoprodI.lean,Mathlib/LinearAlgebra/FreeModule/IdealQuotient.lean,Mathlib/LinearAlgebra/LinearDisjoint.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/TensorProduct/Submodule.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Flat/FaithfullyFlat.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Defs.lean,Mathlib/RingTheory/Ideal/Lattice.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Prod.lean,Mathlib/RingTheory/Presentation.lean,Mathlib/RingTheory/Smooth/Kaehler.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean	31	11	['alreadydone', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	315-75353 10 months ago	315-75353 10 months ago	0-0 0 seconds
16361	vihdzp author:vihdzp	chore(SetTheory/Ordinal/FixedPointApproximants): golf + better variable management	We avoid making `f : α →o α` and `x : α` explicit arguments when not needed. We then golf most theorems in the file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-logic merge-conflict awaiting-author	68/101	Mathlib/SetTheory/Ordinal/FixedPointApproximants.lean	1	8	['PhoenixIra', 'YaelDillies', 'github-actions']	nobody	314-71095 10 months ago	314-71095 10 months ago	50-29942 50 days
17513	FR-vdash-bot author:FR-vdash-bot	perf: do not search algebraic hierarchies when using `map_*` lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench t-algebra merge-conflict WIP label:t-algebra$	5/3	Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/GroupTheory/GroupAction/Hom.lean	2	10	['FR-vdash-bot', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	312-47895 10 months ago	312-47895 10 months ago	4-72589 4 days
19212	Julian author:Julian	feat(LinearAlgebra): add a variable_alias for VectorSpace	Taken directly from the variable_alias docs. Zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/why.20.5Bvariable_alias.5D.20attribute.20is.20not.20used.20in.20Mathlib.3F --- This is the first actual variable alias added to mathlib. I haven't reviewed variable_alias fully, but it seems like there's at least 3 ways they could be distributed in Mathlib: * alongside whatever subfolder they "belong to" (which is what I've tentatively done here) * In a file called `Aliases` somewhere near the thing they alias (which seems less discoverable to me) * In a single file, a la `Mathlib.TrainingWheels` (with some less playful name) which is meant to define a bunch of more "friendly" aliases all in one place. I kind of like the idea of the third thing as a future module but perhaps it can be synthesized if/when there are more aliases? For now as I say I've done the first one, but please let me know if someone prefers something else. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	25/0	Mathlib.lean,Mathlib/LinearAlgebra/VectorSpace.lean,scripts/noshake.json	3	10	['Julian', 'PieterCuijpers', 'github-actions', 'urkud']	nobody	311-53140 10 months ago	311-53140 10 months ago	7-68492 7 days
19337	zeramorphic author:zeramorphic	feat(Data/Finsupp): generalise `Finsupp` to any "zero" value	Remove the explicit dependence of `Finsupp` on `[Zero M]`, instead defining `Finsupp'` (better name pending) to be functions that are equal to a fixed value `z : M` cofinitely often. This PR is intended to do the initial work of replacing the definition of `Finsupp` with an instantiation of the more general definition, without adding any appropriate API. If accepted, the API development will follow in later PRs. Issues to consider: - Naming of `Finsupp'.` - Where should `Finsupp'` lemmas go? Do they need their own file/folder under `Data/`? Relevant Zulip threads: - https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Finsupp.20generalisations - https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Finsupp-like.20partial.20function Comments are welcome. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	203/83	Archive/Wiedijk100Theorems/Partition.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Rename.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/Defs.lean,Mathlib/RingTheory/PowerBasis.lean,scripts/nolints_prime_decls.txt	13	5	['github-actions', 'vihdzp', 'zeramorphic']	nobody	309-29217 10 months ago	309-29217 10 months ago	4-60621 4 days
19420	vihdzp author:vihdzp	feat: AM-HM inequality	We prove the weighted and unweighted AM-HM inequalities in linearly ordered semifields. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author WIP label:t-algebra$	36/2	Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Analysis/MeanInequalities.lean	2	7	['YaelDillies', 'github-actions', 'vihdzp']	nobody	305-84617 10 months ago	305-84617 10 months ago	0-46682 12 hours
10332	adri326 author:adri326	feat(Topology/Sets): define regular open sets and their boolean algebra	Introduces a new module, `Mathlib.Topology.Sets.RegularOpens`, which defines the `IsRegularOpen s` predicate (`interior (closure s) = s`) and `TopologicalSpace.RegularOpens`, the type of bundled regular open sets (defined as `Heyting.Regular (Opens X)`). A few properties of regular open sets (bundled and unbundled) and `interior (closure s)` are proven, and a pointwise instance of `MulAction` is provided for regular open sets. --- This PR belongs to my series of PRs around my formalization of Rubin's theorem. There are two possible ways to implement `RegularOpens`: - either construct them by hand and show that they form a boolean algebra (better def-eq but more boilerplate code required) - or use `Heyting.Regular` on the heyting algebra of `Opens` inherited from the `Frame` instance on them I first chose to use the former approach, but using the latter cuts the length of the construction of the boolean algebra of regular open sets by 100 lines of code, and allows us to inherit all of the helper lemmas defined for `Heyting.Regular`. The big downside, though, is that an element of `RegularOpens` isn't defined as a bundled regular open set anymore, but rather as an `Opens` set `s` for which `Opens.interior ↑(Opens.interior ↑sᶜ)ᶜ = s`, so I added an alternative constructor `RegularOpens.of` that instead accepts any set `s` for which `IsRegularOpen s` holds. Another minor downside is that coercion to a set takes two coercions instead of one. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict WIP	434/0	Mathlib.lean,Mathlib/Data/Set/Pointwise/SMul.lean,Mathlib/Topology/Sets/Opens.lean,Mathlib/Topology/Sets/RegularOpens.lean,docs/references.bib	5	1	['adri326']	YaelDillies assignee:YaelDillies	305-56564 10 months ago	414-55754 1 year ago	0-0 0 seconds
14501	jjaassoonn author:jjaassoonn	feat: module structure of filtered colimit of abelian groups over filtered colimit of rings	This helps defining the module structure of stalks This contribution was inspired by the AIM workshop "Formalizing algebraic geometry" in June 2024. --- - [x] depends on: #15315 [I am going to move the result in the new file] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	workshop-AIM-AG-2024 t-algebra t-category-theory merge-conflict awaiting-author label:t-algebra$	439/2	Mathlib/CategoryTheory/Limits/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/Limits/ConcreteCategory/WithAlgebraicStructures.lean	2	48	['YaelDillies', 'adamtopaz', 'erdOne', 'github-actions', 'jjaassoonn', 'joelriou', 'kbuzzard', 'leanprover-community-mathlib4-bot']	joelriou assignee:joelriou	302-60222 9 months ago	302-60222 9 months ago	64-29952 64 days
18756	astrainfinita author:astrainfinita	refactor: deprecate `DistribMulActionSemiHomClass` `MulSemiringActionSemiHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	50/28	Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/GroupTheory/GroupAction/Hom.lean	3	4	['astrainfinita', 'github-actions', 'leanprover-bot']	nobody	297-81286 9 months ago	297-81286 9 months ago	31-75259 31 days
17071	ScottCarnahan author:ScottCarnahan	feat : (LinearAlgebra/RootSystem) : Separation, base, cartanMatrix	This PR defines an abstract separation structure for roots, together with the associated base and Cartan Matrix. In general, the good properties will follow from additional order hypotheses on the base ring (implemented in a future PR). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	111/0	Mathlib.lean,Mathlib/LinearAlgebra/RootSystem/Separation.lean	2	1	['github-actions']	nobody	297-71187 9 months ago	297-71187 9 months ago	20-56416 20 days
19125	yhtq author:yhtq	feat: add theorems to transfer `IsGalois` between pairs of fraction rings	feat: add theorems to transfer `IsGalois` between pairs of fraction rings. - [x] depends on: #18404 - [x] depends on: #19124 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict label:t-algebra$	121/0	Mathlib.lean,Mathlib/FieldTheory/Galois/IsFractionRing.lean,Mathlib/RingTheory/Localization/FractionRing.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	295-7355 9 months ago	301-42778 9 months ago	0-4534 1 hour
18841	hrmacbeth author:hrmacbeth	chore: change some `linarith`s to `linear_combination`s	Change 100 `linarith`s to `linear_combination`s; this is generally a slight speedup. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #18714 (not strictly blocked by this, but the speed comparison will be more informative after it)	merge-conflict WIP	106/107	Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2013Q5.lean,Archive/Imo/Imo2021Q1.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Convex/SpecificFunctions/Basic.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/Convex/Visible.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/Monotone.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/MeasureTheory/Covering/BesicovitchVectorSpace.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/Transcendental/Liouville/LiouvilleWith.lean,Mathlib/Probability/Distributions/Pareto.lean	30	29	['github-actions', 'grunweg', 'hrmacbeth', 'jcommelin', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	293-54681 9 months ago	293-54681 9 months ago	3-30853 3 days
18748	FR-vdash-bot author:FR-vdash-bot	refactor: deprecate `ContinuousLinearMapClass`	--- - [ ] depends on: #18689 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	115/49	Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,Mathlib/Topology/Homeomorph.lean	10	5	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	291-45299 9 months ago	291-45302 9 months ago	0-989 16 minutes
8686	j-loreaux author:j-loreaux	refactor: allow non-unital `AlgEquiv`	This refactors `AlgEquiv` (and `AlgEquivClass`) to incorporate a `map_smul` field instead of `commutes`. This allows us to weaken the type class assumptions on `AlgEquiv` from: ```lean structure AlgEquiv (R A B : Type) [CommSemiring R] [Semiring A] [Semiring B] [Algebra R A] [Algebra R B] ``` to: ```lean structure AlgEquiv (R A B : Type) [Add A] [Add B] [Mul A] [Mul B] [SMul R A] [SMul R B] ``` in accordance with the other `Equiv` structures (e.g., `MulEquiv`, `AddEquiv`, `RingEquiv`). This allows us to use `AlgEquiv` for both unital and non-unital (even non-associative) algebra homomorphisms. Note in addition that `StarAlgEquiv` already follows this paradigm. We supply the convenience constructor `AlgEquiv.ofCommutes`, which is marked `inline` and `reducible`, so that users can still provide go via the `commutes` route for constructing and `AlgEquiv` whenever it is more convenient. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	286/227	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Category/AlgebraCat/Basic.lean,Mathlib/Algebra/DualQuaternion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Star/Free.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Analysis/NormedSpace/LpEquiv.lean,Mathlib/Data/Complex/Module.lean,Mathlib/Data/IsROrC/Basic.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/Data/Matrix/DualNumber.lean,Mathlib/Data/MvPolynomial/Equiv.lean,Mathlib/Data/MvPolynomial/Rename.lean,Mathlib/Data/Polynomial/AlgebraMap.lean,Mathlib/LinearAlgebra/Matrix/Basis.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/LinearAlgebra/Matrix/Reindex.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/TensorProduct/Opposite.lean,Mathlib/Logic/Equiv/TransferInstance.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/Ideal/QuotientOperations.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/MatrixAlgebra.lean,Mathlib/RingTheory/Polynomial/Quotient.lean,Mathlib/RingTheory/PolynomialAlgebra.lean,Mathlib/RingTheory/TensorProduct.lean,Mathlib/Topology/LocallyConstant/Algebra.lean	35	2	['eric-wieser', 'j-loreaux']	nobody	288-57094 9 months ago	668-19871 1 year ago	0-0 0 seconds
11142	hmonroe author:hmonroe	feat(ProofTheory): Define logical symbols abstractly; opens new top-level section, drawing from lean4-logic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict awaiting-author	468/1	Mathlib.lean,Mathlib/Data/Fin/VecNotation.lean,Mathlib/ProofTheory/LogicSymbol.lean	3	19	['PatrickMassot', 'YaelDillies', 'avigad', 'fpvandoorn', 'github-actions']	nobody	287-64501 9 months ago	287-64501 9 months ago	92-18232 92 days
11210	hmonroe author:hmonroe	Test commit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	1950/1	Mathlib.lean,Mathlib/Data/Fin/VecNotation.lean,Mathlib/ProofTheory/Calculus.lean,Mathlib/ProofTheory/FirstOrder/Arith/Language.lean,Mathlib/ProofTheory/FirstOrder/Basic/Syntax/Term.lean,Mathlib/ProofTheory/LogicSymbol.lean,Mathlib/ProofTheory/Matrix.lean,Mathlib/ProofTheory/Semantics.lean,Mathlib/ProofTheory/System.lean,docs/references.bib	10	100	['github-actions']	nobody	287-64500 9 months ago	287-64500 9 months ago	0-0 0 seconds
18294	FR-vdash-bot author:FR-vdash-bot	perf: make `Mul.toSMul` higher priority	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench t-algebra merge-conflict label:t-algebra$	2/5	Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Order/Field/Pointwise.lean,Mathlib/Combinatorics/Additive/AP/Three/Defs.lean,Mathlib/Topology/Algebra/Module/WeakBilin.lean	4	4	['FR-vdash-bot', 'github-actions', 'leanprover-bot']	nobody	282-45693 9 months ago	282-45694 9 months ago	0-0 0 seconds
19699	vihdzp author:vihdzp	chore(SetTheory/Cardinal/Basic): tweak `#α = 0`, `#α = 1`, etc. lemmas	We rename `le_one_iff_subsingleton` → `mk_le_one_iff` and `mk_le_one_iff_set_subsingleton` → `mk_set_le_one_iff` to match the names of other lemmas in this section. We also add `mk_eq_one_iff` and `mk_set_eq_one_iff`. --- These last two lemmas can probably be golfed somehow. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory awaiting-CI merge-conflict	48/16	Mathlib/SetTheory/Cardinal/Basic.lean	1	1	['github-actions']	nobody	280-51127 9 months ago	280-51127 9 months ago	0-5976 1 hour
15773	kkytola author:kkytola	feat: Add type class for ENat-valued floor functions	This PR adds a type class for extended natural number -valued floor functions. This is split off from #15269, where the suggestions were to make the floor function on ENNReal ENat-valued and to have an API mimicling FloorSemirings. Besides ENNReal, at least ENNRat would naturally satisfy the general type class. --- Two things are worth noting: * To fully mimic `FloorSemiring` API, also ceiling functions need to be added. The plan is to do that in a later PR. * The PR introduces the class `CastNatENatClass` to ensure that `natCast` and a coercion from `ENat` behave in the natural and order-respecing manner. This feels a little ad hoc, but such assumptions are needed for general `ENat`-valued floor functions to behave well. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict awaiting-author	231/0	Mathlib.lean,Mathlib/Algebra/Order/EFloor.lean,Mathlib/Data/ENat/Basic.lean	3	5	['YaelDillies', 'github-actions', 'kkytola', 'urkud']	nobody	274-18867 9 months ago	274-18867 9 months ago	66-24436 66 days
3251	kmill author:kmill	feat: deriving `LinearOrder` for simple enough inductive types	Uses the same machinery underlying the `Fintype` derive handler to derive a lexicographical `LinearOrder` for non-recursive inductive types that have no indices. In principle more complicated types can have `LinearOrder`s, but that would require a more sophisticated implementation. --- - [x] depends on: #3198 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author WIP	82/0	Mathlib.lean,Mathlib/Tactic/DeriveLinearOrder.lean	2	5	['ChrisHughes24', 'kim-em', 'kmill', 'vihdzp']	nobody	271-79920 8 months ago	271-79920 8 months ago	1-80342 1 day
3610	TimothyGu author:TimothyGu	feat: derive Infinite automatically for inductive types	Deals with recursive types, but not mutually recursive types or types with indices right now. See docstring for details. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author	517/0	Mathlib.lean,Mathlib/Tactic/DeriveInfinite.lean,test/DeriveInfinite.lean	3	11	['TimothyGu', 'digama0', 'eric-wieser', 'grunweg', 'kim-em', 'kmill']	kmill assignee:kmill	271-79919 8 months ago	271-79919 8 months ago	8-36622 8 days
16120	awainverse author:awainverse	feat(ModelTheory/Algebra/Ring/Basic): Ring homomorphisms are a `StrongHomClass` for the language of rings	Adds an `IsAlgebraic` instance to the language of rings Adds a `StrongHomClass` instance to the type of ring homomorphisms between rings with `CompatibleRing` structures --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic t-algebra RFC merge-conflict label:t-algebra$	34/13	Mathlib/ModelTheory/Algebra/Ring/Basic.lean	1	10	['ChrisHughes24', 'YaelDillies', 'awainverse', 'github-actions', 'jcommelin']	nobody	270-11060 8 months ago	270-11060 8 months ago	135-29017 135 days
15045	Command-Master author:Command-Master	fix(LinearAlgebra/Alternating/Basic): fix `MultilinearMap.alternatization`	See https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/kernel.20deep.20recursion.20detected. Fix ```lean import Mathlib.LinearAlgebra.Determinant example : (1 : Matrix (Fin 8) (Fin 8) ℚ).det = 1 := by rw [Matrix.det_one] ``` causing a `(kernel) deep recursion detected` error. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	51/21	Mathlib/Data/Nat/Factorial/SuperFactorial.lean,Mathlib/LinearAlgebra/Alternating/Basic.lean,test/DetOne.lean	3	12	['Command-Master', 'PatrickMassot', 'eric-wieser', 'github-actions', 'grhkm21', 'grunweg', 'kbuzzard', 'kim-em']	nobody	269-64749 8 months ago	269-64750 8 months ago	0-8789 2 hours
20527	trivial1711 author:trivial1711	refactor(Topology/UniformSpace/Completion): more descriptive names for `α → Completion α`	- We rename the various maps `α → Completion α` in order to make their names more consistent. - Let `α` be a uniform space. We rename the uniformly continuous function `α → Completion α` from `UniformSpace.Completion.coe'` to `UniformSpace.Completion.coe`. - Let `α` be a uniform additive group. We rename the additive group homomorphism `α →+ Completion α` from `UniformSpace.Completion.toCompl` to `UniformSpace.Completion.coeAddHom`. - Let `α` be a uniform ring. The ring homomorphism `α →+* Completion α` is called `UniformSpace.Completion.coeRingHom`; its name is unchanged. - Let `α` be a normed space over a field `𝕜`. We rename the linear isometry `α →ₗᵢ[𝕜] Completion α` from `UniformSpace.Completion.toComplₗᵢ` to `UniformSpace.Completion.coeₗᵢ`. - Let `α` be a normed space over a field `𝕜`. We rename the continuous linear map `α →L[𝕜] Completion α` from `UniformSpace.Completion.toComplL` to `UniformSpace.Completion.coeL`. - Let `α` be a normed additive group. We rename the norm preserving homomorphism `NormedAddGroupHom α (Completion α)` from `NormedAddCommGroup.toCompl` to `UniformSpace.Completion.coeNormedAddGroupHom`. - We analogously rename some other theorems. - We add some trivial theorems (all of which are proved by `rfl`) that state that the functions considered above are equal. We give all of them the `simp` and `norm_cast` attributes. - We add a new theorem `UniformSpace.Completion.coeAddHom_eq_coe` that states that `UniformSpace.Completion.coeAddHom` and `UniformSpace.Completion.coe` are equal as functions. - We similarly add a new theorem `UniformSpace.Completion.coeRingHom_eq_coe`. - We rename the theorem `UniformSpace.Completion.coe_toComplₗᵢ` to `UniformSpace.Completion.coeₗᵢ_eq_coe`. - We rename the theorem `UniformSpace.Completion.coe_toComplL` to `UniformSpace.Completion.coeL_eq_coe`. - We similarly add a new theorem `UniformSpace.Completion.coeNormedAddGroupHom_eq_coe`. - We change all occurrences of the string `((↑) : α → Completion α)` to `(coe : α → Completion α)` or just `coe`. - We put the statements of some theorems into simp normal form by using the plain function `coe` rather than the homomorphisms that carry more structure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	130/92	Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Complex/AbsMax.lean,Mathlib/Analysis/Complex/Liouville.lean,Mathlib/Analysis/InnerProductSpace/Completion.lean,Mathlib/Analysis/Normed/Group/HomCompletion.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/Analysis/SpecialFunctions/NonIntegrable.lean,Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/Nonarchimedean.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Algebra/UniformRing.lean,Mathlib/Topology/Category/UniformSpace.lean,Mathlib/Topology/MetricSpace/Completion.lean,Mathlib/Topology/UniformSpace/Completion.lean	17	4	['eric-wieser', 'github-actions', 'trivial1711']	nobody	263-42092 8 months ago	263-42092 8 months ago	6-66637 6 days
17739	Aaron1011 author:Aaron1011	feat(Topology/Order/DenselyOrdered): prove Not (IsOpen) for intervals	Prove that Iic/Ici/Ioc/Ico/Icc intervals are not open in densely ordered topologies with no min/max element --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology merge-conflict awaiting-author	27/0	Mathlib/Topology/Order/DenselyOrdered.lean	1	8	['github-actions', 'vihdzp']	nobody	261-29367 8 months ago	261-29367 8 months ago	0-4704 1 hour
18474	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `WithOne.to` instances	--- From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data slow-typeclass-synthesis t-algebra merge-conflict label:t-algebra$	9/2	Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean	3	7	['FR-vdash-bot', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	261-29122 8 months ago	261-29122 8 months ago	76-67978 76 days
20656	Komyyy author:Komyyy	feat(Mathlib/Geometry/Manifold/VectorBundle/Sphere): convert orthogonal smooth `M → 𝕊ⁿ` & `M → ℝⁿ⁺¹` to smooth `M → T𝕊ⁿ`	Current Mathlib has no easy way to define function from a manifold to tangent bundles of sphere: `T𝕊ⁿ`. This PR gives this: `sphereTangentMap`. This convert orthogonal smooth `M → 𝕊ⁿ` & `M → ℝⁿ⁺¹` to smooth `M → T𝕊ⁿ`. I also proved that if `f : M → 𝕊ⁿ` & `g : M → ℝⁿ⁺¹` are smooth then `sphereTangentMap` of `f` & `g` is smooth too. --- ⚠ CAUTION I formalized this in my spare time. I don't have the energy to maintain the PR, but I create this PR so this may helps everyone. The only one thing to do is proof cleanup. TODO: - [x] `contDiff_uncurry_stereoInvFunAux` & `coe_sphere_comp_stereoInvFun` may have to be moved to `Mathlib.Geometry.Manifold.Instances.Sphere`. - [ ] Proof cleanup. Current proof may be redundant and ugly. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict please-adopt	246/6	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/VectorBundle/Sphere.lean	3	1	['github-actions']	nobody	260-64056 8 months ago	260-64056 8 months ago	0-0 0 seconds
15711	znssong author:znssong	feat(Combinatorics/SimpleGraph): Some lemmas about walk, cycle and Hamiltonian cycle	--- These lemmas are separated from the `meow-sister/BondyChvatal` branch and will be needed for the proof of the Bondy-Chvátal theorem. - [x] depends on: #15536 - [x] depends on: #16294	new-contributor t-combinatorics merge-conflict awaiting-author	407/3	Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean	4	22	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'znssong']	nobody	260-48453 8 months ago	260-48453 8 months ago	9-13962 9 days
18629	tomaz1502 author:tomaz1502	feat(Computability.Timed): Formalization of runtime complexity of List.merge	This PR adds the formalization of the runtime complexity of the merge function, defined in `Data/List/Sort`. Requires: https://github.com/leanprover-community/mathlib4/pull/15450 References: - Previous PR on mathlib3: https://github.com/leanprover-community/mathlib3/pull/14494/ - First discussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/BSc.20Final.20Project/near/220647062 - Second disussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Formalization.20of.20Runtime.20Complexity.20of.20Sorting.20Algorithms/near/284184450 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor merge-conflict awaiting-author	186/0	Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean	3	2	['github-actions', 'trivial1711']	nobody	260-14372 8 months ago	260-14372 8 months ago	33-11262 33 days
8362	urkud author:urkud	feat(Asymptotics): define `ReflectsGrowth`	--- - [x] depends on: #8349 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict awaiting-author	268/0	Mathlib.lean,Mathlib/Analysis/Asymptotics/ReflectsGrowth.lean	2	14	['YaelDillies', 'fpvandoorn', 'github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	258-21626 8 months ago	258-21626 8 months ago	1-41158 1 day
6692	prakol16 author:prakol16	feat: disjoint indexed union of local homeomorphisms	Add disjoint indexed union of local equivs and local homeomorphisms --- This is leading up to PRing some things related to covering spaces that I wrote a long time ago in lean 3 but never submitted a PR for. Note that this was converted using mathport. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict awaiting-author	126/0	Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/Topology/PartialHomeomorph.lean	2	4	['alreadydone', 'github-actions', 'winstonyin']	nobody	258-6222 8 months ago	258-6222 8 months ago	117-22351 117 days
19291	PieterCuijpers author:PieterCuijpers	feat(Algebra/Order/Hom): add quantale homomorphism	Definition of quantale homomorphisms as functions that are both semigroup homomorphisms and complete lattice homomorphisms. --- - [x] depends on: #19810 - [x] depends on: #19811 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict awaiting-author label:t-algebra$	209/0	Mathlib.lean,Mathlib/Algebra/Order/Hom/Quantale.lean,scripts/noshake.json	3	29	['PieterCuijpers', 'YaelDillies', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot']	nobody	255-36031 8 months ago	255-36032 8 months ago	36-2255 36 days
19352	hrmacbeth author:hrmacbeth	chore: change some `nlinarith`s to `linear_combination`s	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	13/13	Archive/Imo/Imo2021Q1.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Increment.lean,Mathlib/NumberTheory/Modular.lean	8	4	['github-actions', 'hrmacbeth', 'leanprover-bot']	nobody	253-65242 8 months ago	253-65242 8 months ago	0-8636 2 hours
20372	jvlmdr author:jvlmdr	feat(MeasureTheory/Function): Add ContinuousLinearMap.bilinearCompLp(L)	Introduce ContinuousLinearMap.bilinearCompLp and bilinearCompLpL. Generalize eLpNorm_le_eLpNorm_mul_eLpNorm theorems to include constant C in bound condition. --- Expect this may be useful for defining tempered distributions from functions in `L^p`. The definitions more or less follow `ContinuousLinearMap.compLp...`. Names are loosely analogous to `ContinuousLinearMap.bilinearComp` and `SchwartzMap.bilinLeftCLM`. Note: I preferred the spelling `hpqr : p⁻¹ + q⁻¹ = r⁻¹` with `f` in `L^p` and `g` in `L^q` to `hpqr : 1 / p = 1 / q + 1 / r`. It's easier to obtain from `ENNReal.IsConjExponent` too. A few questions: - [ ] I defined `bilinear{Left,Right}LpL` in addition to `bilinearCompLpL` because `LinearMap.mkContinuous₂` is marked as `noncomputable` and `LinearMap.mkContinuous` is not. Is this worth the extra definitions? (Note: This is not visible in the source due to `noncomputable section`.) - [ ] Should I use `C : ℝ` instead of `C : NNReal` for `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'`? - [ ] Is it going to be painful to have `[Fact (1 ≤ p)] [Fact (1 ≤ q)] [Fact (1 ≤ r)]`? I don't think there's a way to avoid it though. Maybe providing specialized versions for `p.IsConjExponent q` with `L^1`? Naming: - [ ] Is it satisfactory to add a `'` to the `eLpNorm_le_eLpNorm_mul_eLpNorm ` definitions in `CompareExp.lean` where `≤ ‖f x‖ * ‖g x‖` has been replaced with `≤ C * ‖f x‖ * ‖g x‖`? These could replace the existing theorems, although I don't want to break backwards compatibility. There are 5 instances: `eLpNorm_le_eLpNorm_top_mul_eLpNorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm_top'`, `eLpNorm'_le_eLpNorm'_mul_eLpNorm''`, `eLpNorm_le_eLpNorm_mul_eLpNorm_of_nnnorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'` (I'm not sure why the existing theorem `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm` has an internal `'`) - [ ] Is `bilinearLeftLpL` a suitable name? Other options: `bilinearCompLpLeftL`, `bilinearCompLeftLpL`, `bilinLeftLpL` (analogous to `SchwartzMap.bilinLeftCLM`) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict	203/40	Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace.lean	2	1	['github-actions']	nobody	248-53379 8 months ago	248-53379 8 months ago	27-43617 27 days
17176	arulandu author:arulandu	feat: integrals and integrability with .re	Lemmas for swapping order of .re and integration/integrability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict awaiting-author	49/0	Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean	4	30	['EtienneC30', 'arulandu', 'github-actions', 'loefflerd']	nobody	247-27812 8 months ago	247-27812 8 months ago	9-73631 9 days
20872	grunweg author:grunweg	feat: lint against the tactic.skipAssignedInstances option in mathlib	This means we can remove the corresponding technical debt entry. We also correct some outdated details in the Linter/Style.lean docstring. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-linter merge-conflict awaiting-author	63/7	Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Topology/Separation/Regular.lean,MathlibTest/LintStyle.lean,scripts/technical-debt-metrics.sh	5	17	['adomani', 'github-actions', 'grunweg']	nobody	247-21842 8 months ago	247-21842 8 months ago	0-9411 2 hours
2605	eric-wieser author:eric-wieser	chore: better error message in linarith	On this mwe: ```lean import Mathlib.Tactic.Linarith example (s : Set ℕ) (h : s = s) : 0 ≤ 1 := by linarith ``` this now indicates where the internal error is coming from. Is there a better way of chaining errors than this? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author	12/1	Mathlib/Tactic/Linarith/Preprocessing.lean	1	3	['Vierkantor', 'harahu', 'kim-em', 'mo271']	nobody	246-43972 8 months ago	681-17259 1 year ago	4-7271 4 days
11837	trivial1711 author:trivial1711	feat: completion of a uniform multiplicative group	Multiplicativize `Topology.Algebra.GroupCompletion`. That is, rewrite it in the multiplicative setting and recover the original results using `@[to_additive]`. - Because `@[to_additive]` doesn't work with `noncomputable section` (https://github.com/leanprover/lean4/pull/2610), some instances with `@[to_additive]` need to be explicitly marked with `noncomputable instance`. - One might be tempted to multiplicativize this definition from `Topology.Algebra.GroupCompletion`: ```lean instance [UniformSpace α] [Add α] : Add (Completion α) := ⟨Completion.map₂ (· + ·)⟩ ``` to this: ```lean @[to_additive] instance [UniformSpace α] [Mul α] : Mul (Completion α) := ⟨Completion.map₂ (· * ·)⟩ ``` However, as Eric Wieser pointed out, doing so would create a bad diamond with the definition ```lean instance [UniformSpace α] [TopologicalRing α] [UniformAddGroup α] [Ring α] : Mul (Completion α) := ⟨curry <\| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))⟩ ``` in `Topology.Algebra.UniformRing`. How should this diamond be resolved? Well, the definition of multiplication that uses `curry <\| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))` is the "correct" one. For example, it yields the correct result if `α` is `ℚ`, unlike the definition that uses `Completion.map₂ (· * ·)`. (This is because `Completion.map₂` yields junk values if used on a function which is not uniformly continuous. Note, however, that if multiplication on `α` is uniformly continuous, then `Completion.map₂ (· * ·)` and `curry <\| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))` are propositionally equal.) So, following Eric's suggestion, we remove the definition that uses `Completion.map₂ (· * ·)`, and generalize the other definition to any uniform space with a multiplication operation: ```lean @[to_additive] noncomputable instance [UniformSpace α] [Mul α] : Mul (Completion α) := ⟨curry <\| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))⟩ ``` This requires slightly modifying some of the proofs in `Topology.Algebra.GroupCompletion`. For example, suppose that `α` is a uniform group. Since we can no longer use `Completion.continuous_map₂`, it becomes more efficient to prove that the multiplication, inversion, and division operations on `Completion α` are uniformly continuous before we prove that `Completion α` is a group. - Previously, `Topology.Algebra.GroupCompletion` had an instance: ```lean instance [UniformSpace α] [Sub α] : Sub (Completion α) := ... ``` Naively multiplicativizing this would yield ```lean @[to_additive] instance [UniformSpace α] [Inv α] : Inv (Completion α) := ... ``` Unfortunately, this would conflict with `Topology.Algebra.UniformField`, which already instantiates `Inv (Completion α)` when `α` is a uniform field. Instead, we use two different `instance` declarations. (If `α` is an additive group, then this instantiates `Neg (Completion α)` twice, and the instances are syntactically equal.) ```lean @[to_additive] noncomputable instance [UniformSpace α] [Group α] : Inv (Completion α) := ... instance [UniformSpace α] [Neg α] : Neg (Completion α) := ... ``` This avoids the bad diamond (because a uniform field can never be a `Group`) while remaining backward compatible. Note that the `@[to_additive]` is necessary here, because it maintains the link between the additive setting and multiplicative setting. We use a similar method to instantiate `Div (Completion α)`. - Some definitions in this file involve a module structure on `α`. We leave these as is and do not attempt to multiplicativize them at all. - The instance of `DistribMulAction` must be multiplicativized to an instance of `MulDistribMulAction` manually. Zulip thread: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Completion.20of.20a.20uniform.20multiplicative.20group --- # (Small) Issue Recall the following trick that this pull request uses to define inversion and negation on uniform spaces. The idea is that we define negation on the completion of any uniform space that has a negation operation, but we define inversion on only the completion of a uniform space that has the structure of a multiplicative group. We do this to avoid creating a bad diamond with the inversion operation on a uniform field. ```lean @[to_additive] noncomputable instance {α : Type} [UniformSpace α] [Group α] : Inv (Completion α) := ... instance {α : Type} [UniformSpace α] [Neg α] : Neg (Completion α) := ... ``` Now, suppose that we want to prove `coe_inv_of_group` (resp. `coe_neg`), which states that the coercion `α → Completion α` commutes with inversion (resp. negation). In the current version of this pull request, `coe_inv_of_group` (resp. `coe_neg`) only applies to uniform multiplicative (resp. additive) groups. However, we do not use the fact that multiplication (resp. addition) on `α` is uniformly continuous to prove it. We only use the fact that inversion (resp. negation) is continuous. So, what we really want is to have more general statements that look like this: ```lean theorem coe_inv_of_group {α : Type} [UniformSpace α] [Group α] [ContinuousInv α] : ... theorem coe_neg {α : Type} [UniformSpace α] [Neg α] [ContinuousNeg α] : ... ``` Note that `coe_inv_of_group` needs the assumption `[Group α]`, because otherwise inversion is not defined on `Completion α` at all. However, `coe_neg` does not need the analogous assumption `[AdditiveGroup α]`. The question is: If `coe_inv_of_group` and `coe_neg` are written in this more general form, how can we link them using `@[to_additive]`? Here is one option, but it obviously leaves something to be desired. ```lean @[to_additive coe_neg_do_not_use_this_use_the_more_general_version] theorem coe_inv_of_group {α : Type} [UniformSpace α] [Group α] [ContinuousInv α] : ... theorem coe_neg {α : Type} [UniformSpace α] [Neg α] [ContinuousNeg α] : ... ``` Co-authored-by: Eric Wieser --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict WIP help-wanted label:t-algebra$	342/217	Mathlib/Analysis/InnerProductSpace/Completion.lean,Mathlib/Analysis/Normed/Group/HomCompletion.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/GroupCompletion.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Algebra/UniformField.lean,Mathlib/Topology/Algebra/UniformMulAction.lean,Mathlib/Topology/Algebra/UniformRing.lean	9	14	['eric-wieser', 'github-actions', 'trivial1711']	nobody	246-21477 8 months ago	246-21477 8 months ago	101-64856 101 days
14686	smorel394 author:smorel394	feat (AlgebraicGeometry/Grassmannian): define the Grassmannian scheme	# The Grassmannian scheme Define the Grassmannian scheme by gluing affine charts. We fix a commutative ring `K`, a free `K`-module of finite type `V` and two natural numbers `r` and `c`. The scheme we define should parametrize surjective `K`-linear maps `V →ₗ[K] (Fin r → K)`, assuming that `V` is of rank `r + c`. We actually define the scheme without assuming the condition on the rank of `V`, but it is empty unless the rank of `V` is `r + c`. Main definitions: * `Grassmannian.glueData K V r c`: the `AlgebraicGeometry.Scheme.GlueData` defining the Grassmannian scheme. * `Grassmannian K V r c`: the Grassmannian scheme, defined as `(Grassmannian.glueData K V r c).glued`. * `Grassmannian.structMorphism K V r c`: the structural morphism from `Grassmannian K V r c` to `Spec K`. # Implementation We use as index type for the charts the type `Basis (Fin (r + c)) K V` (so this is empty unless `V` is free of rank `r + c`). All the charts are the same and equal to the affine space with coordinates indexed by `Fin c × Fin r`, that is, to `Spec (MvPolynomial (Fin c × Fin r) K)`. The idea is that, for `i` in `Basis (Fin (r + c)) K V`, the corresponding chart will parametrize all surjective `K`-linear maps `φ : V →ₗ[K] (Fin r → K)` that become isomorphisms when restricted to the `K`-submodule generated by the first `r` vectors of the basis `i`. To get the point of the chart corresponding to `φ`, we take the matrix of `φ` in the basis `i` of `V` and the canonical basis of `Fin r → K`, we divide it on the right by its top `r × r` square submatrix (which is invertible by assumption), and we taken the botton `c × r` submatrix. This is almost the usual description of the Grassmannian by charts, with three differences: * We consider the Grassmannian parametrizing `r`-dimensional quotients of `V` instead of `r`-dimensional subspaces of `V`, because this is more natural when working over a general ring (or scheme). * In the usual description, we fix a basis of `V` and index the chart by its subsets `I` of cardinality `r`. Here, to avoid making a choice, we instead index charts by the set of bases of `V` and always choose the subset `I` to consist of the first `r` vectors. * Instead of working with `FiniteDimensional.finrank K V - r`, which would cause technical trouble because of the way subtraction works on `ℕ`, we introduce the codimension `c` as an auxiliary variable, and our constructions are only interesting when `r + c` is equal to `FiniteDimensional.finrank K V`. # Why is this a WIP * There a bunch of lemmas in the file `AlgebraicGeometry/Grassmannian/Lemmas.lean` that either should not be necessary or should be put in another PR for some other part of mathlib. * The proofs in `AlgebraicGeometry/Grassmannian/Basic.lean` are probably too complicated, and the names suck. # Notes. This contribution was created as part of the AIM workshop "Formalizing algebraic geometry" in June 2024. --- - [x] depends on: #14711 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	workshop-AIM-AG-2024 t-algebraic-geometry merge-conflict please-adopt WIP	1002/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Grassmannian/Basic.lean,Mathlib/AlgebraicGeometry/Grassmannian/Lemmas.lean	3	15	['erdOne', 'github-actions', 'joelriou', 'leanprover-community-mathlib4-bot', 'smorel394']	nobody	241-68303 7 months ago	241-68303 7 months ago	0-201 3 minutes
9449	hmonroe author:hmonroe	feat: Add Turing machine with the quintet definition (TMQ) and a chainable step function for each TM type	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability merge-conflict awaiting-author	458/1	Mathlib/Computability/TuringMachine.lean,Mathlib/Logic/PartArith.lean	2	8	['eric-wieser', 'github-actions', 'hmonroe']	nobody	240-72556 7 months ago	240-72556 7 months ago	14-19968 14 days
18719	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `SemilinearMapClass.toAddHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench slow-typeclass-synthesis t-algebra merge-conflict label:t-algebra$	14/7	Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unique.lean,MathlibTest/TCSynth.lean	3	4	['FR-vdash-bot', 'github-actions', 'leanprover-bot']	nobody	239-47373 7 months ago	239-47373 7 months ago	0-0 0 seconds
20663	EtienneC30 author:EtienneC30	feat: `PFunLike` typeclass for partial homomorphisms and `LinearPMapClass`	A test PR implementing a typeclass `PFunLike` to represent partial homomorphisms and building a `LinearPMapClass` typeclass. Started from [this](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/ContinuousLinearPMap) discussion. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-algebra merge-conflict WIP label:t-algebra$	278/49	Mathlib.lean,Mathlib/Algebra/Group/PHom.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Data/PFunLike.lean,Mathlib/GroupTheory/GroupAction/PHom.lean,Mathlib/LinearAlgebra/LinearPMap.lean	7	1	['github-actions']	nobody	238-39821 7 months ago	238-39821 7 months ago	0-0 0 seconds
19697	quangvdao author:quangvdao	feat(BigOperators/Fin): Sum/product over `Fin` intervals	This PR adds new theorems about the sum/product of some vector over `Fin` intervals. One example is: ``` @[to_additive] theorem prod_Iic_succ (i : Fin n) : ∏ j ∈ Iic i.succ, v j = (∏ j ∈ Iic i.castSucc, v j) * v i.succ ``` --- - [x] depends on: #20360 This is in preparation for reworking `finSigmaFinEquiv` and `finProdFinEquiv` in #19013. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict awaiting-author	87/12	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Data/Fintype/Fin.lean,Mathlib/Order/Interval/Finset/Fin.lean	3	20	['Ruben-VandeVelde', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'quangvdao']	nobody	238-28574 7 months ago	238-28574 7 months ago	6-25961 6 days
19353	hrmacbeth author:hrmacbeth	chore: golf some term/rw proofs using `linear_combination`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	47/102	Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/Zsqrtd/Basic.lean,Mathlib/Topology/ContinuousMap/ZeroAtInfty.lean	7	5	['github-actions', 'grunweg', 'hrmacbeth', 'leanprover-bot']	grunweg assignee:grunweg	237-27695 7 months ago	237-27695 7 months ago	0-7781 2 hours
21196	vihdzp author:vihdzp	chore: make argument of `zero_le` implicit	This simplifies our expressions probably 95% of the time, and the remaining 5% we can simply use the Lean 4 implicit argument notation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-CI merge-conflict	10/10	Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean	1	1	['github-actions']	nobody	237-3817 7 months ago	237-3817 7 months ago	0-0 0 seconds
21610	JLimperg author:JLimperg	Aesop forward benchmark: forward precomp	Not a real PR, just for benchmarking.	merge-conflict	30/27	Mathlib/Data/List/InsertIdx.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	7	3	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	235-46580 7 months ago	236-34943 7 months ago *	0-0 0 seconds *
21611	JLimperg author:JLimperg	Aesop forward benchmark: master no-precomp	Not a real PR, just for benchmarking.	merge-conflict	30/27	Mathlib/Data/List/InsertIdx.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	7	4	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	235-46579 7 months ago	236-34899 7 months ago *	0-0 0 seconds *
21612	JLimperg author:JLimperg	Aesop forward benchmark: master precomp	Not a real PR, just for benchmarking.	merge-conflict	30/27	Mathlib/Data/List/InsertIdx.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	7	3	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	235-46578 7 months ago	236-34780 7 months ago *	0-0 0 seconds *
10678	adri326 author:adri326	feat(Topology/UniformSpace): prove that a uniform space is completely regular	Provides the pseudometric definition of a uniform space (for any open set `s` and `x ∈ s`, there exists a finite family of pseudometric spaces on `X` and an `ε > 0`, such that the intersection of the balls of these pseudometric spaces is a subset of `s`), and uses it to prove that `UniformSpace X` implies `CompletelyRegularSpace X`. --- This PR aims to close the gap of pi-base's theorem [T345](https://topology.pi-base.org/theorems/T000345), which says that topological groups are completely regular. We already have a proof that topological groups are uniform, but it turns out that we do not have any connection between `UniformSpace X` and `CompletelyRegularSpace X`. There is an equivalence between `UniformSpace X` and `CompletelyRegularSpace X`: the former implies the latter, and the latter implies the existence of the former. This PR provides the first half of this equivalence. The construction of the pseudometric definition is based on N. Bourbaki, Chapter 9, Theorem 4.1 The proof that a uniform space is completely regular is based on [the outline on mathexchange](https://math.stackexchange.com/questions/494718/how-to-prove-that-every-uniform-space-is-completely-regular). I tried to outline the major steps of the different proofs inside of comments; I can happily be more verbose to clear up any confusion. See [the corresponding Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Some.20missing.2C.20accessible.2C.20topology.20results) for more context. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict awaiting-author	332/0	Mathlib.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/CompletelyRegular.lean	3	6	['ADedecker', 'adri326']	ADedecker assignee:ADedecker	235-22106 7 months ago	235-22106 7 months ago	17-44773 17 days
20030	vihdzp author:vihdzp	refactor: avoid ordinals in Nöbeling's theorem	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict WIP help-wanted	356/428	Mathlib/Topology/Category/Profinite/Nobeling.lean	1	1	['github-actions']	nobody	233-78091 7 months ago	233-78091 7 months ago	0-0 0 seconds
18785	erdOne author:erdOne	feat(CategoryTheory): command that generates instances for `MorphismProperty`	Co-authored-by: Calle Sönne --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory t-meta merge-conflict awaiting-author	369/0	Mathlib.lean,Mathlib/CategoryTheory/MorphismProperty/Tactic.lean,MathlibTest/AddMorphismPropertyInstances.lean,scripts/noshake.json	4	19	['alexjbest', 'chrisflav', 'erdOne', 'github-actions', 'grunweg', 'jcommelin', 'joelriou']	nobody	233-38616 7 months ago	233-38616 7 months ago	52-4682 52 days
15942	grunweg author:grunweg	chore: move style linters into their own file; document all current linters	Just to show the overall direction: this PR is just a tracking PR; it is easier to re-do the remaining pieces individually. - [x] depends on: #19529 (and needs a merge afterwards) --- The documenting of items should move into Tactic.Linter... [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict awaiting-author	634/287	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/AdmitLinter.lean,Mathlib/Tactic/Linter/GlobalAttributeIn.lean,Mathlib/Tactic/Linter/HashCommandLinter.lean,Mathlib/Tactic/Linter/HaveLetLinter.lean,Mathlib/Tactic/Linter/Lint.lean,Mathlib/Tactic/Linter/OldObtain.lean,Mathlib/Tactic/Linter/RefineLinter.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,Mathlib/Util/SleepHeartbeats.lean,lakefile.lean,test/AdmitLinter.lean,test/Change.lean,test/Check.lean,test/Clear!.lean,test/ClearExcept.lean,test/Clear_.lean,test/DefEqTransformations.lean,test/DeriveToExpr.lean,test/ExtractGoal.lean,test/ExtractLets.lean,test/GuardGoalNums.lean,test/GuardHypNums.lean,test/HashCommandLinter.lean,test/Lint.lean,test/LintStyle.lean,test/MfldSetTac.lean,test/MinImports.lean,test/SimpRw.lean,test/SplitIfs.lean,test/TermBeta.lean,test/TypeCheck.lean,test/UnsetOption.lean,test/Use.lean,test/basicTactics.lean,test/casesm.lean,test/convert.lean,test/fail_if_no_progress.lean,test/fun_prop_dev.lean,test/itauto.lean,test/meta.lean,test/notation3.lean,test/recover.lean,test/says.lean,test/symm.lean,test/trace.lean,test/trans.lean	54	5	['github-actions', 'grunweg', 'joneugster', 'mathlib4-dependent-issues-bot']	nobody	231-65240 7 months ago	231-65240 7 months ago	0-36287 10 hours
16311	madvorak author:madvorak	feat(Computability): regular languages are context-free	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability merge-conflict WIP	72/0	Mathlib.lean,Mathlib/Computability/Chomsky.lean,Mathlib/Computability/ContextFreeGrammar.lean	3	7	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'madvorak']	nobody	231-45035 7 months ago	231-45035 7 months ago	0-0 0 seconds
19943	AlexLoitzl author:AlexLoitzl	feat(Computability): Add Chomsky Normal Form Grammar and translation	- Define Chomsky normal form grammars - Add language-preserving translation between context-free grammars and Chomsky normal form grammars Co-authored-by: Martin Dvorak martin.dvorak@matfyz.cz --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor merge-conflict awaiting-author	3151/0	Mathlib.lean,Mathlib/Computability/ChomskyNormalForm/Basic.lean,Mathlib/Computability/ChomskyNormalForm/EmptyElimination.lean,Mathlib/Computability/ChomskyNormalForm/LengthRestriction.lean,Mathlib/Computability/ChomskyNormalForm/TerminalRestriction.lean,Mathlib/Computability/ChomskyNormalForm/Translation.lean,Mathlib/Computability/ChomskyNormalForm/UnitElimination.lean,Mathlib/Computability/ContextFreeGrammar.lean	8	59	['AlexLoitzl', 'YaelDillies', 'github-actions', 'kim-em', 'madvorak']	nobody	231-44788 7 months ago	231-44788 7 months ago	37-29014 37 days
19616	adamtopaz author:adamtopaz	fix: Fix the definition of the absolute Galois group of a field	Previously it was defined as the Galois group of the algebraic closure, as opposed to the separable closure. Also, this adds some missing instances for this group. Still missing is compactness, but that seems like a bigger project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory merge-conflict awaiting-author label:t-algebra$	23/8	Mathlib/FieldTheory/AbsoluteGaloisGroup.lean,Mathlib/FieldTheory/KrullTopology.lean	2	4	['acmepjz', 'alreadydone', 'github-actions']	nobody	231-43023 7 months ago	231-43023 7 months ago	3-64280 3 days
17005	YnirPaz author:YnirPaz	feat(SetTheory/Cardinal/Regular): define singular cardinals	Define singular cardinals and prove basic lemmas about them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict WIP	94/1	Mathlib.lean,Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/SetTheory/Ordinal/Basic.lean	3	28	['YaelDillies', 'YnirPaz', 'github-actions', 'vihdzp']	nobody	228-78144 7 months ago	304-71326 10 months ago	34-18388 34 days
18952	Command-Master author:Command-Master	chore: deprecate `Trunc`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict WIP	283/57	Mathlib/CategoryTheory/EpiMono.lean,Mathlib/CategoryTheory/Preadditive/Biproducts.lean,Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Option.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Semiquot.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/Logic/Equiv/List.lean	12	8	['eric-wieser', 'github-actions', 'vihdzp']	nobody	228-29361 7 months ago	228-29361 7 months ago	0-0 0 seconds
18463	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Notation/FundamentalSequence): define type of fundamental sequences	We define `Sequence α` as the type of sequences with length 0, 1, or `ω`, and give a basic API. A subsequent PR will introduce the notion of a (countable and computable) fundamental sequence and establish basic results. The goal of this is to generalize [`ONote.fundamentalSequence`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/SetTheory/Ordinal/Notation.html#ONote.fundamentalSequence) to allow the construction of fundamental sequences for other ordinal notations. --- See [my ordinal notation repository](https://github.com/vihdzp/ordinal-notation/blob/a6fdd7fe7cb521e686ea271902e7e5496f1804d3/OrdinalNotation/Cantor.lean#L1218) for a demonstration of how this API looks in practice. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-order merge-conflict	174/1	Mathlib.lean,Mathlib/SetTheory/Ordinal/Notation/Cantor.lean,Mathlib/SetTheory/Ordinal/Notation/FundamentalSequence.lean	3	19	['YnirPaz', 'b-mehta', 'github-actions', 'vihdzp']	nobody	226-77521 7 months ago	226-77521 7 months ago	52-25108 52 days
12054	adomani author:adomani	feat: auto-bugs	This PR introduces a linter for suggesting bugs in tactics. See * #12077 * #12083 * #12084 for some bugs exposed by the test suite. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author	737/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/MetaTesting.lean,scripts/noshake.json,test/MetaTesting.lean	5	20	['adomani', 'eric-wieser', 'github-actions', 'joneugster', 'kim-em']	joneugster assignee:joneugster	226-1216 7 months ago	226-1216 7 months ago	45-6057 45 days
5062	adomani author:adomani	feat(Tactic/Prune + test/Prune): add `prune` tactic, for removing unnecessary hypotheses	This tactic removes very conservatively all local declarations that 1. do not appear in the main goal, 2. do not appear in a declaration that appears in the main goal, 3. ... and so on recursively. The main motivation for this tactic is that all available variables in the current `namespace/section` appear in the goal state, not just the ones that are needed for the statement to type-check. Using `prune` mitigates this situation. The tactic also admits an optional natural number argument: `prune n` removes all variables that have not appeared at the `(n+1)`-st stage in the above list. Thus, `prune 0` only leaves the variables needed for the statement to type-check. Also, for sufficiently large `n`, `prune n` is a synonym for `prune`. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/substitute.20for.20.60include.2Fomit.60.3F) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict modifies-tactic-syntax awaiting-author	181/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Prune.lean,test/Prune.lean	4	5	['adomani', 'j-loreaux', 'kmill']	nobody	225-54923 7 months ago	225-54923 7 months ago	195-56460 195 days
22169	JLimperg author:JLimperg	Aesop forward benchmark: forward no-precomp naive	Not a real PR, just for benchmarking.	merge-conflict	31/27	Mathlib/Data/List/InsertIdx.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	7	6	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	224-20587 7 months ago	224-32641 7 months ago *	0-0 0 seconds *
21433	grunweg author:grunweg	chore: change more lemmas to be about enorm instead of nnnorm	--- - [x] depends on: #21782 - [x] depends on: #21783 (and this PR modifies the file split, and file splits are painful to merge over) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson t-measure-probability merge-conflict awaiting-author	172/71	Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/ContinuousFunctions.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean	9	18	['RemyDegenne', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib4-dependent-issues-bot']	nobody	224-19776 7 months ago	226-53260 7 months ago	2-42743 2 days
22171	JLimperg author:JLimperg	Aesop forward benchmark: forward no-precomp naive rpinf pr-release	Not a real PR, just for benchmarking.	merge-conflict	31/27	Mathlib/Data/List/InsertIdx.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	7	5	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	223-28460 7 months ago	224-32204 7 months ago *	0-0 0 seconds *
21099	chrisflav author:chrisflav	chore(RingTheory/Generators): use unification hints for variables and relations	When working with generators and presentations, we rely on the `MvPolynomial` API, but since the type of variables is bundled in `Generators R S`, many lemmas don't apply with `rw` or `simp`, because they can't see through the definition of `vars` in constructions such as `Generators.comp` and `Generators.localizationAway`. A possible approach is to make all of these constructions `abbrev`s, but this causes `simp` to also unfold `val` which is not always desirable. More generally, it is then harder to predict how instance search and `simp` behave. This approach is tried in #21050, but causes many regressions. This approach is less invasive, as it uses `unif_hint` to unify the `vars` (and `rels`) fields of constructions with the correct type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	231/91	Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/RingTheory/Generators.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/Presentation.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean	5	16	['chrisflav', 'erdOne', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	222-36357 7 months ago	222-36357 7 months ago	27-75210 27 days
21269	CharredLee author:CharredLee	(WIP) feat (CategoryTheory/Topos): Add topos theory content	This code contains basic definitions and results in topos theory, including the definition of a subobject classifier, power objects, and topoi. It is proved that every topos has exponential objects, i.e. "internal homs". The mathematical content follows chapter IV sections 1-2 of Mac Lane and Moerdijk's text "Sheaves in Geometry and Logic". --- - [x] depends on: #21281 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory merge-conflict awaiting-author WIP	1269/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Basic.lean,Mathlib/CategoryTheory/Topos/Classifier.lean,Mathlib/CategoryTheory/Topos/Exponentials.lean,Mathlib/CategoryTheory/Topos/Power.lean	5	10	['CharredLee', 'gio256', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	221-11060 7 months ago	221-11060 7 months ago	0-13879 3 hours
12394	JADekker author:JADekker	feat : define pre-tight and tight measures	Define tight measures (by first defining separable and pre-tight measures). Define some api for all three concepts Prove Ulam's tightness theorem and a strengthened version of this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict please-adopt awaiting-author	503/0	Mathlib.lean,Mathlib/MeasureTheory/Measure/Tight.lean	2	34	['EtienneC30', 'JADekker', 'github-actions', 'sgouezel']	nobody	220-39953 7 months ago	220-39953 7 months ago	2-604 2 days
20454	urkud author:urkud	chore(TangentCone): review names	Also add some `@[simp]` attrs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	201/139	Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/Deriv/Abs.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/FDeriv/RestrictScalars.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Calculus/VectorField.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/InverseDeriv.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/UniqueDifferential.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/MeasureTheory/Integral/FundThmCalculus.lean	25	3	['github-actions', 'sgouezel', 'urkud']	nobody	219-66356 7 months ago	219-66356 7 months ago	12-11675 12 days
21608	JLimperg author:JLimperg	Aesop forward benchmark: forward no-precomp rpinf pr-release	Not a real PR, just for benchmarking.	merge-conflict	38/29	Mathlib/Data/List/InsertIdx.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	8	13	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	219-41089 7 months ago	236-35153 7 months ago *	0-0 0 seconds *
21609	JLimperg author:JLimperg	Aesop forward benchmark: forward no-precomp	Not a real PR, just for benchmarking.	merge-conflict	38/29	Mathlib/Data/List/InsertIdx.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	8	13	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	219-39453 7 months ago	236-35017 7 months ago *	0-0 0 seconds *
16550	awainverse author:awainverse	feat(ModelTheory): A typeclass for languages expanding other languages	Defines `L.Expands L'` to consist of a privileged injective inclusion, `L'.Inclusion L`, from `L'` to `L`, corresponding to one language being a subset of the other in set-theoretic foundations. Replaces `L.IsOrdered` with `L.Expands Language.order` and `L.OrderLHom` with `Language.order.Inclusion L` Redefines `leSymb` in terms of `Language.order.Inclusion L` Deletions: - `FirstOrder.Language.IsOrdered` - `FirstOrder.Language.OrderLHom` - `instance : IsOrdered Language.order` - `sum.instIsOrdered` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict awaiting-author	97/43	Mathlib/ModelTheory/LanguageMap.lean,Mathlib/ModelTheory/Order.lean	2	9	['YaelDillies', 'awainverse', 'github-actions']	nobody	219-18824 7 months ago	219-18825 7 months ago	0-61590 17 hours
13686	fpvandoorn author:fpvandoorn	feat: some finset lemmas	* From the Sobolev inequality project * The increase in imports in `Mathlib.Data.Finset.Update` is not problematic: it is only imported in MeasureTheory files. Co-authored-by: Heather Macbeth 25316162+hrmacbeth@users.noreply.github.com --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict awaiting-author	69/7	Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Lattice/Lemmas.lean,Mathlib/Data/Finset/Update.lean	3	7	['YaelDillies', 'fpvandoorn', 'github-actions', 'urkud']	nobody	218-18455 7 months ago	218-18455 7 months ago	98-49006 98 days
14313	grhkm21 author:grhkm21	feat(RepresentationTheory/FdRep): FdRep is a full subcategory of Rep	``` /-- Equivalence between `FDRep` and the full subcategory of finite dimensional `Rep`. -/ def equivFiniteDimensional : FDRep k G ≌ FullSubcategory (fun V : Rep k G ↦ FiniteDimensional k V) ```	new-contributor t-algebra t-category-theory merge-conflict label:t-algebra$	47/8	Mathlib/RepresentationTheory/FDRep.lean	1	19	['github-actions', 'grhkm21', 'joelriou', 'kim-em', 'mathlib-bors']	nobody	217-53386 7 months ago	217-53386 7 months ago	125-12755 125 days
18626	hannahfechtner author:hannahfechtner	feat : define Artin braid groups	Define the Artin braid group on infinitely many strands. Includes a toGroup function which defines a function out of the braid group to any other group (given a function which satisfies the braid relations) (more to come in this file; next up: Artin braid groups on finitely many strands) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict awaiting-author label:t-algebra$	91/0	Mathlib.lean,Mathlib/GroupTheory/SpecificGroups/BraidGroup/Basic.lean	2	22	['github-actions', 'hannahfechtner', 'jcommelin', 'joelriou']	nobody	216-37697 7 months ago	216-37697 7 months ago	15-40648 15 days
10823	alexkeizer author:alexkeizer	feat: convert curried type functions into uncurried type functions	Adds a conversion `TypeFun.ofCurried : CurriedTypeFun.{u, v} n -> TypeFun.{u, v} n`, where `CurriedTypeFun.{u,v} n` is a (def-eq) abbreviation for `Type u -> ... -> Type u -> Type v`, i.e., the type of curried functions taking `n` arguments of type `Type u` to return an element of `Type v`, and `TypeFun.{u, v} n` is an abbreviation for `TypeVec.{u} n -> Type v`. It is generally more idiomatic to define type functions with multiple arguments in the curried style, but in the QPF development we use the uncurried equivalent `TypeVec n -> Type _`. Thus, having a canonical conversion from curried functions to uncurried gives us a canonical way to ask if a curried type function, say `Sum` is a QPF (namely, "is there an instance of `MvQPF (TypeFun.ofCurried Sum)`"). --- This is code ported from https://github.com/alexkeizer/QpfTypes, where this conversion is crucial in presenting a high-level interface, in terms of idiomatic, curried, type functions to users, while being built on QPFs (and thus, uncurried typefunctions) underneath. There is also a conversion in the other direction, from uncurried to curried, which I've decided to PR later, to keep this PR smaller and hopefully easier to review. - [x] depends on: #10818 (all changes to `Fin2.lean` are part of 10818, not the current PR) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict awaiting-author	66/0	Mathlib.lean,Mathlib/Data/TypeFun.lean	2	9	['YaelDillies', 'alexkeizer', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	216-31417 7 months ago	unknown	unknown
13648	urkud author:urkud	feat(Topology/Module): generalize `ContinuousLinearMap.compSL`	Generalize `ContinuousLinearMap.compSL` to topological vector spaces. --- - [ ] depends on: #15217 This PR is not polished yet, but the main statement is there. @ADedecker This answers a question I asked you on Zulip a few months ago. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis t-topology merge-conflict awaiting-author label:t-algebra$	23/18	Mathlib/Analysis/NormedSpace/OperatorNorm/Bilinear.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean	2	5	['fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	214-54507 7 months ago	214-54507 7 months ago	0-0 0 seconds
21684	mattrobball author:mattrobball	draft		merge-conflict	13/11	Mathlib/CategoryTheory/Category/Cat/AsSmall.lean,Mathlib/CategoryTheory/Closed/FunctorToTypes.lean,Mathlib/CategoryTheory/Closed/Types.lean,Mathlib/FieldTheory/IsAlgClosed/Classification.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/Topology/Category/LightProfinite/Basic.lean,lean-toolchain	7	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	214-48077 7 months ago	214-48077 7 months ago	0-0 0 seconds
21722	mattrobball author:mattrobball	test		merge-conflict	76/23	Mathlib/CategoryTheory/Category/Cat/AsSmall.lean,Mathlib/CategoryTheory/Closed/FunctorToTypes.lean,Mathlib/CategoryTheory/Closed/Types.lean,Mathlib/FieldTheory/IsAlgClosed/Classification.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/Topology/Category/LightProfinite/Basic.lean,lean-toolchain,scratch.lean	9	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	214-48076 7 months ago	214-48076 7 months ago	0-0 0 seconds
22408	JLimperg author:JLimperg	Aesop forward bench: precomp only rpinf	--- Not a real PR (yet), just for benchmarking. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	dependency-bump merge-conflict	5/3	lake-manifest.json,lakefile.lean,scripts/bench/fake-root/lib/lean/libleanshared.so,scripts/bench/run	4	6	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	214-42911 7 months ago	214-42911 7 months ago	0-0 0 seconds
21339	vihdzp author:vihdzp	fix(Data/List/Lex): remove duplicate `List.LE` instance	Mathlib currently duplicates the Lean core instance for `≤` in lists in an incompatible way. We delete this duplicate instance. See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Two.20.60List.2ELE.60.20instances.3F/near/497241115). --- This is a very quick and dirty fix. Core Lean provides all of the theorems we need to prove `≤` forms a linear order, but it provides them in terms of `Std` relation typeclasses which currently see no use in Mathlib. I've added the instances that were required to get the list theorems working. In the future, we really ought to unify the core and Mathlib relation typeclasses. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	24/22	Mathlib/Data/List/Lex.lean,Mathlib/Data/String/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean	3	1	['github-actions']	nobody	214-35249 7 months ago	214-35249 7 months ago	16-65973 16 days
16421	FR-vdash-bot author:FR-vdash-bot	feat: `QuotLike`	This typeclass is primarily for use by type synonyms of `Quot` and `Quotient`. Using `QuotLike` API for type synonyms of `Quot` and `Quotient` will avoid defeq abuse caused by directly using `Quot` and `Quotient` APIs. --- Some of the naming may need to be discussed. For example, `⟦·⟧` is currently called `mkQ` in names. This distinguishes it from other `.mk`s and makes it possible to write the quotient map as `mkQ` `mkQ'` `mkQ_ h`. But this will also require changing the old lemma names. [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/migrate.20to.20.60QuotLike.60.20API) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data RFC merge-conflict awaiting-author	735/1	Mathlib.lean,Mathlib/Data/QuotLike.lean,Mathlib/Logic/Relation.lean,test/QuotLike.lean	4	7	['FR-vdash-bot', 'YaelDillies', 'github-actions', 'urkud']	nobody	213-81964 6 months ago	213-81964 6 months ago	58-8650 58 days
16837	vihdzp author:vihdzp	feat(Data/List/SplitBy): characterization of `List.splitBy`	--- - [x] depends on: #16818 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict awaiting-author	151/9	Mathlib/Data/List/Flatten.lean,Mathlib/Data/List/SplitBy.lean	2	13	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	213-81964 6 months ago	213-81964 6 months ago	9-85039 9 days
19700	vihdzp author:vihdzp	chore(SetTheory/Ordinal/Basic): tweak `type r = 0`, `type r = 1`, etc. lemmas	We give shorter names to these lemmas (e.g. `type_eq_zero` instead of `type_eq_zero_of_empty`), and deprecate a bunch of duplicates. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory awaiting-CI merge-conflict	51/38	Mathlib/SetTheory/Ordinal/Basic.lean	1	1	['github-actions']	nobody	213-81717 6 months ago	213-81717 6 months ago	0-0 0 seconds
21959	BGuillemet author:BGuillemet	feat(Topology/ContinuousMap): Stone-Weierstrass theorem for MvPolynomial	Add the subalgebra of multivariate polynomials and prove it separates points, on the same model as `ContinuousMap/Polynomial.lean`. Prove the Stone-Weierstrass theorem and some variations for multivariate polynomials. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology merge-conflict	285/1	Mathlib.lean,Mathlib/Topology/ContinuousMap/MvPolynomial.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	3	1	['github-actions']	nobody	212-39400 6 months ago	212-39400 6 months ago	16-76141 16 days
19177	adomani author:adomani	test: the findDefEqAbuse linter	This is a prototype, as per [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Locating.20defeq.20abuse) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	126/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/FindDefEqAbuse.lean,MathlibTest/FindDefEqAbuse.lean	5	1	['github-actions']	nobody	210-41413 6 months ago	210-41413 6 months ago	0-0 0 seconds
20750	adomani author:adomani	feat: the envLinter syntax linter	The `envLinter` syntax linter emits a warning at the end of a file if `#lint` reports an error. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict	69/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/EnvLinter.lean,MathlibTest/EnvLinter.lean	5	15	['adomani', 'github-actions', 'grunweg']	nobody	210-41167 6 months ago	210-41167 6 months ago	51-71438 51 days
22359	adomani author:adomani	feat(whitespace): do not allow indented doc-strings	In a doc-string, Do not allow the first character after the first line break to be a space. --- There are approximately 2.5k exceptions. I think that they should be unindented, judging from the sample that I looked at, but won't act on it, unless there is a clear plan to fix and merge this modification! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict WIP	222/70	Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Mathlib.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/Analysis/Asymptotics/ExpGrowth.lean,Mathlib/Data/Matroid/Circuit.lean,Mathlib/Init.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Encode.lean,Mathlib/LinearAlgebra/Dimension/StrongRankCondition.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/DocString.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/UnitInterval.lean,MathlibTest/LintDocstring.lean,lakefile.lean	20	1	['github-actions']	nobody	210-40332 6 months ago	210-40332 6 months ago	0-0 0 seconds
18470	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `Normed.to` instances	--- From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra t-analysis merge-conflict label:t-algebra$	28/0	Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean	2	9	['FR-vdash-bot', 'github-actions', 'jcommelin', 'leanprover-bot']	nobody	208-10827 6 months ago	208-10827 6 months ago	130-5197 130 days
16944	YnirPaz author:YnirPaz	feat(SetTheory/Cardinal/Cofinality): lemmas about limit ordinals and cofinality	Prove that a singular cardinal has a limit aleph index and that a limit ordinal and positive cofinality. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict WIP	18/0	Mathlib/SetTheory/Cardinal/Cofinality.lean	1	8	['YnirPaz', 'github-actions', 'vihdzp']	nobody	207-3703 6 months ago	207-3703 6 months ago	1-84890 1 day
17368	Felix-Weilacher author:Felix-Weilacher	feat(Topology/Baire/BaireMeasurable): add the Kuratowski-Ulam theorem	Add the Kuratowski-Ulam theorem, which one can think of as a "Fubini" for Baire category. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	187/1	Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Topology/Baire/BaireMeasurable.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/GDelta/Basic.lean	5	6	['Felix-Weilacher', 'github-actions', 'urkud']	nobody	206-34896 6 months ago	206-34896 6 months ago	72-13986 72 days
8767	eric-wieser author:eric-wieser	refactor(Cache): tidy lake-manifest parsing in Cache	This now respects local copies of Mathlib dependencies (though in practice these invalidate the online cache because to point to local copies of Mathlib, the hash for `lakefile.lean` and `lake-manifest.json` is first invalidated). --- - [x] depends on: #11492 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	49/49	Cache/Hashing.lean,Cache/IO.lean,lake-manifest.json	3	8	['digama0', 'eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	205-10559 6 months ago	386-62909 1 year ago	119-35643 119 days
22434	qawbecrdtey author:qawbecrdtey	feat(Mathlib/Analysis/Normed/Lp/WithLp): Added more instances for `WithLp`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict awaiting-author	51/22	Mathlib/Analysis/Normed/Lp/WithLp.lean	1	11	['eric-wieser', 'github-actions', 'leanprover-bot', 'qawbecrdtey']	nobody	204-39998 6 months ago	204-39998 6 months ago	1-79072 1 day
15578	znssong author:znssong	feat(Function): Fixed points of function `f` with `f(x) >= x`	We added some lemmas of fixed points of function `f` with `f(x) >= x`, where `f : α → α` is a function on a finite type `α`. This will be needed in proof of Bondy-Chvátal theorem. --- See also branch `meow-sister/BondyChvatal`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict awaiting-author	82/0	Mathlib.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Increasing.lean	3	32	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'urkud', 'vihdzp', 'znssong']	nobody	204-35226 6 months ago	204-35226 6 months ago	29-48368 29 days
22805	ScottCarnahan author:ScottCarnahan	feat (FieldTheory/Finite): fixed points of frobenius	This PR identifies the prime field with the fixed points of frobenius. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	325/7	Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Finite/GaloisField.lean	4	1	['github-actions']	nobody	202-45938 6 months ago	202-45938 6 months ago	0-0 0 seconds
22660	Ruben-VandeVelde author:Ruben-VandeVelde	chore: follow naming convention around Group.IsNilpotent	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	133/67	Mathlib/GroupTheory/Frattini.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/SpecificGroups/ZGroup.lean	3	1	['github-actions']	nobody	200-61655 6 months ago	200-61655 6 months ago	10-48025 10 days
13999	adomani author:adomani	feat: a linter to flag potential confusing conventions	Currently, the linter flags all uses of * `a - b` where `a b : Nat`; * `a / b` where `a b : Nat` or `a b : Int`; * `a / 0` more or less whenever the type of `a` has a `0` and a division. This comes up often when starting to use Lean and hopefully the flag can help mitigate initial confusions. When the local context contains the relevant inequality/divisibility hypothesis, the linter is quiet. A recent [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/not.20understanding.20deliberate.20error.20with.20.60ring.60.20over.20.E2.84.95/near/445879310) --- To make sure that the linter does not produce errors, #14007 activates the linter on "all" of mathlib. The expectation is that no error is thrown, just warnings. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict awaiting-author	251/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/Papercut.lean,MathlibTest/Papercut.lean	4	24	['Julian', 'YaelDillies', 'adomani', 'eric-wieser', 'github-actions']	nobody	200-7289 6 months ago	200-7289 6 months ago	7-47472 7 days
15991	vihdzp author:vihdzp	feat(SetTheory/Ordinal/CantorNormalForm): alternate CNF recursion principle	The idea of this recursion principle is that you can build an ordinal by adding one power of `b` at a time, as long as `1 < b ≤ ω`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-logic merge-conflict awaiting-author	43/0	Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/CantorNormalForm.lean,Mathlib/SetTheory/Ordinal/Exponential.lean	3	8	['YaelDillies', 'eric-wieser', 'github-actions', 'vihdzp']	nobody	199-55473 6 months ago	199-55473 6 months ago	91-50443 91 days
19698	vihdzp author:vihdzp	refactor(SetTheory/Cardinal/Cofinality): redefine `Order.cof`	We redefine `Order.cof` as a function on preorders, rather than one well-ordered relations. This allows us to use the `IsCofinal` API, alongside all the other goodies that come from a proper order structure. Finally, we clean up the `Ordinal.cof` API by relying on order results, rather than trying to haphazardly treat ordinals as sets. --- - [ ] depends on: #21972 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict WIP	502/583	Mathlib/Order/Cofinal.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Ordinal/Basic.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	199-53013 6 months ago	199-53013 6 months ago	0-0 0 seconds
20967	joneugster author:joneugster	tracking(CategoryTheory/Enriched/Limits): add conical limits	Tracking PR for adding conical limits Co-authored-by: Emily Riehl Co-authored-by: Dagur Asgeirsson --- - [x] depends on: #20904 - [x] depends on: #20907 - [x] depends on: #20959 - [x] depends on: #20963 - [x] depends on: #20964 - [x] depends on: #20965 - content source: emilyriehl/infinity-cosmos#78 New implementation (not reflected on this branch yet): - [x] depends on: #22917 - [x] depends on: #22921 - [ ] depends on: #22923 - [ ] depends on: #22924 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos t-category-theory merge-conflict WIP	619/1	Mathlib.lean,Mathlib/CategoryTheory/Enriched/Limits/HasConicalLimits.lean,Mathlib/CategoryTheory/Enriched/Limits/HasConicalProducts.lean,Mathlib/CategoryTheory/Enriched/Limits/HasConicalPullbacks.lean,Mathlib/CategoryTheory/Enriched/Limits/HasConicalTerminal.lean,Mathlib/CategoryTheory/Enriched/Limits/IsConicalLimit.lean,Mathlib/CategoryTheory/Enriched/Limits/IsConicalTerminal.lean,Mathlib/CategoryTheory/Enriched/Ordinary/Basic.lean	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	199-12895 6 months ago	199-12897 6 months ago	0-0 0 seconds
19013	quangvdao author:quangvdao	feat(Algebra/BigOperators/Fin): Add `finSigmaFinEquiv`	This PR adds `finSigmaFinEquiv` which is the equivalence `(i : Fin m) × Fin (n i) ≃ Fin (∑ i, n i)`. This is the dependent version of `finProdFinEquiv`. CI should be passing, but there are two things I'd like feedback on: 1. When defining the mappings, I have to consider `m = 0` separately. Is there a more uniform definition? 2. I'm proving this as a step toward defining `Fin.join`, which is the analogue of `List.join`. I can now technically define `Fin.join` as: ``` variable {a : Fin n → ℕ} {α : (i : Fin n) → (j : Fin (a i)) → Sort*} def join (v : (i : Fin n) → (j : Fin (a i)) → α i j) (k : Fin (∑ i, a i)) : α (finSigmaFinEquiv.invFun k).1 (finSigmaFinEquiv.invFun k).2 := v (finSigmaFinEquiv.invFun k).1 (finSigmaFinEquiv.invFun k).2 ``` but this looks horrible. This highly motivates refactoring `invFun` as two new definitions: ``` def func1 {n : ℕ} (a : Fin n → ℕ) (k : Fin (∑ i, a i)) : Fin n := sorry def func2 {n : ℕ} (a : Fin n → ℕ) (k : Fin (∑ i, a i)) : Fin (a (func1 a k)) := sorry ``` I'm not sure what to call these functions. The analogues in the non-dependent case are `divNat` and `modNat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	92/16	Mathlib/Algebra/BigOperators/Fin.lean	1	14	['YaelDillies', 'eric-wieser', 'github-actions', 'quangvdao']	nobody	198-29322 6 months ago	198-29322 6 months ago	3-28829 3 days
20389	eric-wieser author:eric-wieser	feat: generalize results to `WithLp 0`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	116/53	Mathlib/Analysis/Normed/Lp/PiLp.lean	1	1	['github-actions']	nobody	197-17870 6 months ago	197-17870 6 months ago	0-0 0 seconds
19189	YnirPaz author:YnirPaz	feat(SetTheory/Ordinal/Arithmetic): order isomorphism between omega and the natural numbers	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict awaiting-author	44/0	Mathlib/Order/SuccPred/Limit.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean	2	21	['YaelDillies', 'YnirPaz', 'github-actions', 'vihdzp']	nobody	196-85355 6 months ago	196-85355 6 months ago	47-37012 47 days
19227	adomani author:adomani	fix(CI): unwrap `lake test` in problem matcher	... and also add a `#guard_msgs` in `AssertImported` test, so that `lake test` properly fails. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/CI.3A.20noisy.20.22test.20mathlib.22/near/483126955) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict awaiting-author	9/20	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,MathlibTest/AssertImported.lean	5	2	['bryangingechen', 'github-actions']	nobody	195-48358 6 months ago	195-48359 6 months ago	22-71271 22 days
20874	grunweg author:grunweg	chore(nolint.yml): use shallow clones	This should be sufficient, and be slightly faster on CI. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict awaiting-author	0/3	.github/workflows/nolints.yml	1	2	['bryangingechen', 'github-actions']	nobody	195-48113 6 months ago	195-48113 6 months ago	0-15573 4 hours
15774	kkytola author:kkytola	feat: Topology on `ENat`	This PR may contain some results that are not in the PR that adds a toppology on `ENat`. --- The immediate motivation is to be able to make the right continuity statement of the extended floor function on `ENNReal`, when this floor function is made `ENat`valued as suggested in the PR review of #15269. The API here is modelled on the early parts of [the corresponding ENNReal file](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Instances/ENNReal.html#top), although much of this case is more trivial. - [x] depends on: #15380 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-topology merge-conflict WIP	161/9	Mathlib/Data/ENat/Basic.lean,Mathlib/Topology/Instances/ENat.lean	2	4	['YaelDillies', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	191-5890 6 months ago	191-5890 6 months ago	0-6819 1 hour
18284	chrisflav author:chrisflav	feat(AlgebraicGeometry): relative gluing of schemes	We show https://stacks.math.columbia.edu/tag/01LH using #14208. This shall be used to construct the relative spectrum of a quasi-coherent algebra. --- - [ ] depends on: #14208 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict WIP	1393/7	Mathlib.lean,Mathlib/AlgebraicGeometry/Gluing.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/RelativeGluing.lean,Mathlib/AlgebraicGeometry/Sites/Representability.lean,Mathlib/CategoryTheory/Functor/FullyFaithful.lean,Mathlib/CategoryTheory/Limits/Shapes/Types.lean,Mathlib/CategoryTheory/MorphismProperty/Representable.lean	8	n/a	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	190-28642 6 months ago	unknown	unknown
16810	urkud author:urkud	feat: define `(a : ENat) ^ (b : ENat)`	The definition agrees with `Cardinal.toENat`, i.e., `#(α → β) = #β ^ #α`, where `#` is the not-yet-defined `ENat.card α = Cardinal.toENat (Cardinal.mk α)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-data merge-conflict	51/0	Mathlib.lean,Mathlib/Data/ENat/Pow.lean	2	1	['github-actions']	nobody	189-71483 6 months ago	189-71483 6 months ago	0-0 0 seconds
16009	Command-Master author:Command-Master	acyclic graph	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict WIP	232/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	1	['github-actions']	nobody	189-40439 6 months ago	189-40439 6 months ago	0-0 0 seconds
20613	grunweg author:grunweg	chore: golf using `List.toArrayMap`	--- Depends on batteries#1090 landing in mathlib. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	27/21	Cache/Main.lean,Cache/Requests.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Lookup.lean,Mathlib/Tactic/DeriveTraversable.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/MoveAdd.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,Mathlib/Util/CompileInductive.lean,Mathlib/Util/GetAllModules.lean,Mathlib/Util/Notation3.lean,scripts/autolabel.lean	11	2	['github-actions', 'vihdzp']	nobody	187-4856 6 months ago	187-4856 6 months ago	22-82622 22 days
15989	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Principal): golf theorems on additively principal ordinals	We add some new results on additively principal ordinals and use them to simplify existing theorems. --- - [x] depends on: #15990 - [x] depends on: #17740 - [x] depends on: #17741 - [x] depends on: #17742 - [x] depends on: #17842 - [x] depends on: #18902 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-logic merge-conflict awaiting-author	64/59	Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/SetTheory/Ordinal/Principal.lean	3	8	['YaelDillies', 'github-actions', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	185-83099 6 months ago	185-83099 6 months ago	60-46576 60 days
22682	grunweg author:grunweg	chore(Topology/Homeomorph): split out various constructions	This makes `Homeomorph.lean` slightly more manageable, and also is a mild import reduction. edit: also split out IsHomeomorph, as this allows removing the dependencies on Constructions. Let's see if this gains much --- I don't feel strongly about this PR, but we might as well take it. - [ ] depends on: #22681 - [ ] depends on #22827 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-topology RFC merge-conflict	341/290	Mathlib.lean,Mathlib/Topology/Category/TopCat/ULift.lean,Mathlib/Topology/Homeomorph/Constructions.lean,Mathlib/Topology/Homeomorph/IsHomeomorph.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/NoetherianSpace.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	185-80862 6 months ago	185-80862 6 months ago	14-35834 14 days
21018	markimunro author:markimunro	feat(Data/Matrix): add file with key definitions and theorems about elementary row operations	Prove that each elementary row operation is equivalent to a multiplication by an elementary matrix, has another row operation which inverts it, and that each elementary matrix has a left inverse. This is a very large PR and I understand it will take time. This is my first one and will likely have issues but I will be ready to answer questions/fix them as soon as possible. Co-authored-by: Christopher Lynch --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict awaiting-author enhancement	1230/0	Mathlib.lean,Mathlib/Data/Matrix/ElementaryRowOperations.lean,Mathlib/Data/Matrix/GaussianElimination.lean,Mathlib/Data/Matrix/GaussianEliminationOld,Mathlib/Data/Matrix/oldnames,et --hard 18533caba32,lean-toolchain	7	n/a	['chrisflav', 'eric-wieser', 'github-actions', 'j-loreaux', 'markimunro']	nobody	185-70625 6 months ago	unknown	unknown
23514	eric-wieser author:eric-wieser	refactor: smooth over Lattice/LinearOrder inheritance	This fixes the forgetful inheritance in `CompleteLinearOrder` and `ConditionallyCompleteLinearOrder`, which previously did not carry `compare` fields. (edit: moved to #23515) The following is the inheritance diagram before, where the dotted lines are manual instances. Note that every lattice typeclass that extends `LinearOrder` has to implement another dotted line edge, and remember to copy all the necessary data fields. ```mermaid graph TD LinearOrder --> Min,Max; LinearOrder --> PartialOrder; Lattice --> PartialOrder; CompleteLinearOrder --> Lattice; ConditionallyCompleteLinearOrder --> Lattice; LinearOrder-.-> Lattice; CompleteLinearOrder -.-> LinearOrder; ConditionallyCompleteLinearOrder -.-> LinearOrder; ``` This change introduces two new auxiliary typeclasses, to encapsulate these troublesome edges. `LinearOrderedLattice` can be thought of as `LinearOrder`, but with `sup`/`inf` instead of `min`/`max`. This is crucial, because it ensures the duplicate fields are merged in `extends CompleteLattice X, LinearOrderedLattice X`, which would not be the case for `extends CompleteLattice X, LinearOrder X`. The result is: ```mermaid graph TD LinearOrder --> Min,Max; LinearOrder --> LinearOrderBase; LinearOrderBase --> PartialOrder; Lattice --> PartialOrder; LinearOrderedLattice -.-> LinearOrder; LinearOrderedLattice --> LinearOrderBase; LinearOrderedLattice --> Lattice; CompleteLinearOrder --> LinearOrderedLattice; ConditionallyCompleteLinearOrder --> LinearOrderedLattice; ``` --- - [ ] depends on: #23515 - [ ] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	85/66	Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Order/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Lattice.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	185-10055 6 months ago	185-10055 6 months ago	0-3019 50 minutes
20746	JLimperg author:JLimperg	Aesop forward branch test	--- This is not a real PR; I just want to benchmark this Aesop branch. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	14/6	.github/workflows/build.yml,Mathlib/Data/Nat/Prime/Defs.lean,lake-manifest.json,lakefile.lean,scripts/bench/fake-root/lib/lean/libleanshared.so,scripts/bench/run	6	11	['JLimperg', 'Kha', 'github-actions', 'leanprover-bot']	nobody	184-53861 6 months ago	242-36814 8 months ago	0-0 0 seconds
22810	pechersky author:pechersky	feat(Counterexamples): metric space not induced by norm	Because the distance is not homogeneous --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #22845	t-analysis t-topology merge-conflict WIP	202/1	Counterexamples.lean,Counterexamples/NotBoundedSMulMetricSpace.lean,Mathlib.lean,Mathlib/Analysis/Normed/PiNat.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/MetricSpace/Polish.lean	6	21	['eric-wieser', 'github-actions', 'loefflerd', 'mathlib4-dependent-issues-bot', 'pechersky']	nobody	184-46517 6 months ago	184-46545 6 months ago	0-84180 23 hours
13124	FR-vdash-bot author:FR-vdash-bot	chore: remove `CovariantClass` and `ContravariantClass`	Lean cannot handle `CovariantClass` and `ContravariantClass` correctly - TC slowness - [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/TC.20slowness) - https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1691792488 - It may also have made #6326 fail. - Needs a weird hack to find instance: #9252 --- - [x] depends on: #13154 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	602/486	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/Group/Subgroup/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Algebra/Order/Group/Action.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/Units.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Ring/Subring/Pointwise.lean,Mathlib/Algebra/Ring/Subsemiring/Pointwise.lean,Mathlib/Analysis/SumOverResidueClass.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/Order/Filter/IsBounded.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/RingTheory/Ideal/Pointwise.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/Order/LiminfLimsup.lean	37	6	['FR-vdash-bot', 'MichaelStollBayreuth', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	183-74494 6 months ago	183-74494 6 months ago	0-1769 29 minutes
20401	RemyDegenne author:RemyDegenne	feat: add sigmaFinite_iUnion	```lean lemma sigmaFinite_iUnion (μ : Measure α) {s : ℕ → Set α} (h_meas : MeasurableSet (⋃ n, s n)) [∀ n, SigmaFinite (μ.restrict (s n))] : SigmaFinite (μ.restrict (⋃ n, s n)) ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict awaiting-author	37/28	Mathlib/MeasureTheory/Decomposition/Exhaustion.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean	2	4	['RemyDegenne', 'github-actions', 'sgouezel']	nobody	182-79648 5 months ago	182-79649 5 months ago	0-73190 20 hours
19275	eric-wieser author:eric-wieser	fix: if nolint files change, do a full rebuild	Otherwise CI will succeed when removing entries from the file, but fail later when someone changes something unrelated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict delegated	8/0	lakefile.lean	1	20	['YaelDillies', 'adomani', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	182-43816 5 months ago	182-43816 5 months ago	0-214 3 minutes
12251	ScottCarnahan author:ScottCarnahan	refactor(RingTheory/HahnSeries) : several generalizations	This PR is a container for several smaller PRs that refactor and generalize the existing Hahn series theory. It is (I think) all we need from Hahn series to get a palatable theory of vertex algebras off the ground (other prerequisites from Lie algebras will eventually come in a different PR). Major changes include: - equivalence between iterated Hahn series and Hahn series on Lex products. - introduce `orderTop` and `leadingCoeff` functions. Here, `orderTop` is a `WithTop Γ`-valued version of `order` that does not need `[Zero Γ]` and `leadingCoeff` returns the coefficient of the minimal element of support (or zero if empty). - introduce ordered and cancellative vector addition classes together with some basic theory e.g., finiteness of antidiagonals for partially well-ordered sets. - `HahnSeries Γ R`-module structure on `HahnModule Γ' R V`, when `Γ` is an `OrderedCancelAddCommMonoid`, `Γ'` is a `PartialOrder` with `OrderedCancelVAdd Γ Γ'`, `R` is a semiring, and `V` is an `R`-module. - Move `AddVal` to a separate file - the underlying function is just `orderTop`, but the description of the valuation needs an additional import and an `IsDomain` hypothesis. Results that depended on `AddVal` are changed to use `orderTop` and generalized. --- - [x] depends on: #10781 [HahnSeries on Lex product] - [x] depends on: #10846 [HahnModule] - [x] depends on: #11965 [orderTop] - [x] depends on: #11979 [OrderedVAdd] - [x] depends on: #12996 [leadingTerm] - [x] depends on: #16649 - [x] depends on: #16701 - [x] depends on: #17004 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra merge-conflict WIP label:t-algebra$	1059/97	Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Basic.lean,Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/HahnSeries/Summable.lean	6	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	182-30237 5 months ago	unknown	unknown
22727	grunweg author:grunweg	feat: rewrite the isolated by and colon linters in Lean	--- - depends on #22726 - depends on: #22728 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict awaiting-author	128/96	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Basic.lean,Mathlib/Data/Finsupp/AList.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/TFAE.lean,Mathlib/Data/Matroid/Circuit.lean,Mathlib/Data/Matroid/Minor/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/LinearAlgebra/TensorProduct/Vanishing.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Probability/Kernel/WithDensity.lean,Mathlib/RingTheory/NoetherNormalization.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Topology/Sets/OpenCover.lean,scripts/lint-style.py	15	3	['adomani', 'github-actions', 'grunweg']	nobody	181-19534 5 months ago	181-19534 5 months ago	10-50342 10 days
22027	vihdzp author:vihdzp	chore(SetTheory/Ordinal/FixedPoint); review `Ordinal.nfp` API	This PR does the following: - add `iff` variants of various theorems, renaming some in the process - weaken some assumptions slightly - golf throughout --- - [x] depends on: #22017 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	64/61	Mathlib/Logic/Equiv/List.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean	2	3	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	181-19407 5 months ago	183-72767 6 months ago	43-68322 43 days
15212	victorliu5296 author:victorliu5296	feat: Add fundamental theorem of calculus-2 for Banach spaces	add the Mean Value Theorem for Banach spaces to the library and include reference for the theorem statement This theorem states that if `f : X → Y` is differentiable along the line segment from `a` to `b`, then the change in `f` equals the integral of its derivative along this path. This extends the mean value theorem to Banach spaces. This can be used for the eventual proof of the Newton-Kantorovich theorem with 1 constant contained inside the added reference. Here is the discussion on Zulipchat: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Contributing.20FTC-2.20for.20Banach.20spaces	new-contributor t-measure-probability t-analysis merge-conflict awaiting-author	60/1	Mathlib/MeasureTheory/Integral/FundThmCalculus.lean	1	3	['github-actions', 'hrmacbeth', 'victorliu5296']	nobody	180-65614 5 months ago	180-65614 5 months ago	51-85104 51 days
22701	ctchou author:ctchou	feat(Combinatorics): the Katona circle method	This file formalizes the Katona circle method. From PlainCombi (LeanCamCombi): https://github.com/YaelDillies/LeanCamCombi/blob/master/LeanCamCombi/PlainCombi/KatonaCircle.lean Co-authored-by: Yaël Dillies	new-contributor t-combinatorics merge-conflict	121/0	Mathlib.lean,Mathlib/Combinatorics/KatonaCircle.lean	2	1	['github-actions']	nobody	180-15169 5 months ago	180-15169 5 months ago	30-8337 30 days
23402	mattrobball author:mattrobball	refactor(LinearAlgebra.TensorProduct): make `TensorProduct` irreducible	Mathematicians generally do not reason about tensor products using a particular model, precisely because the universal properties are more natural and the precise instantiations are too complicated for most purposes. Similarly, we shouldn't allow Lean to look inside `TensorProduct` and encourage building API on top of it to avoid definitional abuse. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	124/69	Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct/Isometries.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Subalgebra.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/Bialgebra/TensorProduct.lean,Mathlib/RingTheory/Coalgebra/TensorProduct.lean,Mathlib/RingTheory/Kaehler/CotangentComplex.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/LocalRing/Module.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	15	8	['eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	179-69874 5 months ago	179-69875 5 months ago	0-0 0 seconds
15943	urkud author:urkud	feat: add `ProdQuotientMapSpace`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	731/11	Mathlib.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Maps/ProdQuotient.lean	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	178-83986 5 months ago	178-83989 5 months ago	0-0 0 seconds
23786	grunweg author:grunweg	Mr librarynote def 2b	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict WIP	510/484	Archive/Imo/Imo2019Q2.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Algebra/Colimit/Ring.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/Field/MinimalAxioms.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/End.lean,Mathlib/Algebra/Group/Action/Hom.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/MinimalAxioms.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Scalar.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Equiv.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Module/ZMod.lean,Mathlib/Algebra/NoZeroSMulDivisors/Basic.lean,Mathlib/Algebra/NoZeroSMulDivisors/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/InjSurj.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Module/Defs.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/ExistsOfLE.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Star.lean,Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Order/Sub/Basic.lean,Mathlib/Algebra/Ring/Action/Basic.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/MinimalAxioms.lean,Mathlib/Algebra/Ring/Subring/Defs.lean,Mathlib/Algebra/Ring/Subsemiring/Defs.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Algebra/Star/StarRingHom.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Note.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/InnerProductSpace/Convex.lean,Mathlib/Analysis/InnerProductSpace/OfNorm.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Constructions.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Analysis/Normed/Order/Lattice.lean,Mathlib/Analysis/Normed/Ring/Basic.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/CategoryTheory/Comma/Over/OverClass.lean,Mathlib/CategoryTheory/Monoidal/Skeleton.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/FunLike/Fintype.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Init.lean	180	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	178-76087 5 months ago	178-76089 5 months ago	0-0 0 seconds
23411	PatrickMassot author:PatrickMassot	chore: remove finiteness from Order.Filter.Lift	Co-authored-by: Anatole Dedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	longest-pole t-topology merge-conflict	48/21	Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Order/Filter/Lift.lean,Mathlib/Order/Filter/SmallSets.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Basic.lean	7	4	['Vierkantor', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	178-61883 5 months ago	178-81452 5 months ago	10-21608 10 days
22579	kvanvels author:kvanvels	doc(Topology/Defs/Induced): fix comments on three functions related to RestrictGenTopology	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict awaiting-author documentation	10/9	Mathlib/Topology/Defs/Induced.lean,Mathlib/Topology/RestrictGen.lean	2	4	['github-actions', 'kvanvels', 'leanprover-community-bot-assistant', 'urkud']	nobody	177-72517 5 months ago	177-72519 5 months ago	12-18679 12 days
19771	robertylewis author:robertylewis	perf: qqify two functions in linarith	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	17/24	Mathlib/Tactic/Linarith/Frontend.lean,Mathlib/Tactic/Linarith/Verification.lean	2	5	['github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'robertylewis']	nobody	177-52023 5 months ago	177-52024 5 months ago	0-0 0 seconds
22308	plp127 author:plp127	feat (Analysis/Convex): Generalize `Convex` lemmas to `StarConvex`	This PR generalizes many lemmas assuming `Convex 𝕜 s` to assume `StarConvex 𝕜 0 s`. --- - [x] depends on: #22421 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict WIP	30/18	Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/GaugeRescale.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/LocallyConvex/AbsConvexOpen.lean	4	5	['Paul-Lez', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	177-51534 5 months ago	177-51536 5 months ago	0-0 0 seconds
21488	imbrem author:imbrem	feat(CategoryTheory/Monoidal): premonoidal categories	Add support for premonoidal categories --- Still want to add support for: - Premonoidal braided/symmetric categories - The monoidal coherence theorem, which I've already ported in my `discretion` library - The `coherence` tactic, which should work fine for premonoidal categories too but wanted to get this in front of reviewers ASAP to make sure my general approach was alright [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory merge-conflict	900/361	Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/CoherenceLemmas.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,MathlibTest/StringDiagram.lean	21	9	['YaelDillies', 'github-actions', 'grunweg', 'imbrem', 'kim-em', 'leanprover-community-bot-assistant']	nobody	177-47802 5 months ago	177-47803 5 months ago	58-20339 58 days
21525	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Prelim)	This PR defines the basic preliminaries for defining locally cartesian closed categories (LCCCs). In particular, using the calculus of mates we define certain natural isomorphisms involving `Over.star` and `Over.pullback` which will be crucial in defining the right adjoint to the pullback functor in the development of LCCCs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict	338/24	Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Galois/Examples.lean	3	13	['b-mehta', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'sinhp']	nobody	177-47800 5 months ago	177-47802 5 months ago	43-83249 43 days
13653	adomani author:adomani	feat: the unusedSetOptionIn linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict	199/0	Mathlib.lean,Mathlib/Algebra/Homology/HomotopyCategory/Triangulated.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/UnnecessarySetOptionIn.lean,MathlibTest/UnnecessarySetOptionIn.lean	6	15	['adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	176-78638 5 months ago	176-78640 5 months ago	0-0 0 seconds
19425	hrmacbeth author:hrmacbeth	perf: gcongr forward-reasoning adjustment	This PR changes the "forward-reasoning" component of `gcongr`, rendering it more efficient, particularly in problems with a large number of variables/hypotheses in the context. Previously `gcongr` attempted to match every `LocalDecl` against every node in the parse tree using each of the five implemented `@[gcongr_forward]` mini-tactics: matching directly, matching after applying `symm`, matching after applying `le_of_lt`, etc etc. The new algorithm filters out the non-Prop `LocalDecl`s, and also adjusts the `@[gcongr_forward]` extensions so that, rather than re-apply the relevant lemmas (`symm`, `le_of_lt`, etc) at every node in the parse tree, the lemmas are applied in advance to the `LocalDecl`s and the result (if successful) stored. The performance effect on mathlib as a whole is miniscule, but it speeds up the profiler's count of "tactic execution of Mathlib.Tactic.GCongr" in the newly-added test from 257 ms to 47 ms, and has a similar effect on real-life examples in an analysis project of mine. Co-authored-by: Mario Carneiro --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) (Note that Mario provided the ideas but not the code, so please review with appropriate diligence!)	merge-conflict awaiting-author	130/59	Mathlib/Order/Lattice.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GCongr/ForwardAttr.lean,MathlibTest/GCongr/inequalities.lean	4	17	['Vierkantor', 'github-actions', 'hrmacbeth', 'leanprover-bot', 'leanprover-community-bot-assistant']	Vierkantor assignee:Vierkantor	176-60334 5 months ago	176-60336 5 months ago	4-16654 4 days
20873	vbeffara author:vbeffara	feat(Topology/Covering): path lifting and homotopy lifting	This proves the existence and uniqueness of path and homotopy lifts through covering maps. --- I tried to separate as much of the proof as possible into separate PRs (which are already in Mathlib now), but the proof here relies on a monolithic construction of an explicit lift along a well-chosen subdivision, in `partial_lift`, with associated definitions. Only one standalone lean file added. An older WIP PR #10084 by Junyan Xu @alreadydone proves similar results using a very similar construction for path lifting, with a different argument to obtain continuity for homotopy lifting. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology merge-conflict awaiting-author	281/1	Mathlib.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Lift.lean	3	9	['alreadydone', 'github-actions', 'grunweg', 'vbeffara']	nobody	176-50530 5 months ago	176-50530 5 months ago	55-53553 55 days
22817	peabrainiac author:peabrainiac	feat(CategoryTheory/Sites): local sites	Defines local sites and shows that sheaves of types on them form a local topos, in that the global sections functor `Sheaf.Γ` has a right adjoint `Sheaf.codisc` that is fully faithful. --- - [x] depends on: #22816 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	263/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/FunctorCategory/Shapes/Products.lean,Mathlib/CategoryTheory/Limits/Types.lean,Mathlib/CategoryTheory/Sites/GlobalSections.lean,Mathlib/CategoryTheory/Sites/LocalSite.lean,Mathlib/CategoryTheory/Sites/Sheaf.lean	6	4	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	175-70539 5 months ago	175-74062 5 months ago	0-568 9 minutes
6252	michaellee94 author:michaellee94	feat(Geometry/Manifolds/Instances/Homeomorph): Homeomorphism maps `C^k` manifolds to `C^k` manifolds	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict WIP	116/0	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Graph.lean	2	2	['leanprover-community-bot-assistant', 'michaellee94']	nobody	175-44995 5 months ago	175-44997 5 months ago	1-44375 1 day
16314	FR-vdash-bot author:FR-vdash-bot	chore(Data/Quot): deprecate `ind*'` APIs	--- - [x] depends on: #16264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	247/287	Counterexamples/CliffordAlgebraNotInjective.lean,Mathlib/Algebra/Colimit/Module.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/CategoryTheory/ConnectedComponents.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Computability/Reduce.lean,Mathlib/Computability/Tape.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/Multiset/MapFold.lean,Mathlib/Data/Multiset/ZeroCons.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/FieldTheory/Fixed.lean,Mathlib/GroupTheory/Complement.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/Hom.lean,Mathlib/GroupTheory/Coset/Basic.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/GroupTheory/PresentedGroup.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/GroupTheory/SchurZassenhaus.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Category/PartOrd.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Hilbert90.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Functoriality.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Valuation/Quotient.lean,Mathlib/Topology/Algebra/Group/TopologicalAbelianization.lean,Mathlib/Topology/Algebra/InfiniteSum/Module.lean,Mathlib/Topology/Separation/Basic.lean	65	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	171-72766 5 months ago	171-72768 5 months ago	55-52030 55 days
23509	eric-wieser author:eric-wieser	refactor: Make ENNReal an abbrev	The `Coe` instance becomes `CoeTC` to match what we do for `WithTop` (such that the priority kicks in) Probably we could have both copies and things would be ok. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This includes part of #23750	t-data merge-conflict	22/66	Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/BigOperators.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/MeasureTheory/Measure/Sub.lean,Mathlib/MeasureTheory/Measure/TightNormed.lean,Mathlib/Topology/MetricSpace/PartitionOfUnity.lean	7	22	['eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'mattrobball', 'urkud']	nobody	171-56419 5 months ago	171-56421 5 months ago	14-12910 14 days
24060	eric-wieser author:eric-wieser	chore(MeasureTheory): use `0` instead of `const _ 0`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict	30/20	Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Function/SimpleFuncDense.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Countable.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/Probability/StrongLaw.lean	7	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	171-46114 5 months ago	171-46116 5 months ago	0-0 0 seconds
11455	adomani author:adomani	fix: unsqueeze simp, re Yaël's comments on #11259	This PR reverts/simplifies some of the "squeeze `simp`" changes in #11259. See #11259 for context. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	3/6	Mathlib/Algebra/Group/Conj.lean,Mathlib/Data/Seq/WSeq.lean	2	8	['Ruben-VandeVelde', 'YaelDillies', 'grunweg', 'loefflerd', 'robertylewis', 'urkud']	nobody	171-18019 5 months ago	441-44609 1 year ago	91-14162 91 days
7325	eric-wieser author:eric-wieser	chore: use preimageIso instead of defeq abuse for InducedCategory	This makes a few things slightly more verbose, but the type casts are now explicit in those places. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-CI merge-conflict	22/21	Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/Subcategory.lean	3	1	['grunweg']	nobody	171-17898 5 months ago	451-46983 1 year ago	0-0 0 seconds
7874	astrainfinita author:astrainfinita	chore: make `IsScalarTower A A B` and `IsScalarTower A B B` higher priority	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra awaiting-CI merge-conflict label:t-algebra$	10/9	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Data/Rat/Cast/Defs.lean,Mathlib/GroupTheory/GroupAction/Ring.lean	4	3	['astrainfinita', 'grunweg', 'leanprover-bot']	nobody	171-17873 5 months ago	441-44868 1 year ago	0-0 0 seconds
5952	eric-wieser author:eric-wieser	feat: add Qq wrappers for ToExpr	--- - [ ] depends on: #6699 (to appease the linter) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI t-meta merge-conflict	247/150	Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/VecNotation.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Tactic/DeriveToExpr.lean,Mathlib/Tactic/FBinop.lean,Mathlib/Tactic/ToExpr.lean,Mathlib/Util/Qq.lean,test/DeriveToExpr.lean,test/vec_notation.lean	9	7	['eric-wieser', 'gebner', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	171-17699 5 months ago	451-46983 1 year ago	29-67421 29 days
15483	FR-vdash-bot author:FR-vdash-bot	chore(GroupTheory/Coset): reduce defeq abuse	--- - [x] depends on: #15482 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	114/60	Mathlib/GroupTheory/Commensurable.lean,Mathlib/GroupTheory/Coset.lean,Mathlib/GroupTheory/QuotientGroup.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/MeasureTheory/Measure/Haar/Quotient.lean,Mathlib/Topology/Algebra/Group/Compact.lean	6	14	['FR-vdash-bot', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball', 'mergify', 'urkud']	nobody	171-17659 5 months ago	419-55989 1 year ago	4-79214 4 days
16594	FR-vdash-bot author:FR-vdash-bot	perf: reorder `extends` and remove some instances in algebra hierarchy	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra merge-conflict label:t-algebra$	240/92	Mathlib.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Associated/Basic.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Prod.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Field/Canonical/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/Rat.lean,Mathlib/Algebra/Ring/SumsOfSquares.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean,Mathlib/CategoryTheory/Preadditive/FunctorCategory.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/Interval/Finset/Box.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/RingTheory/Ideal/Quotient.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/Util/NoInstances.lean,scripts/noshake.json	50	8	['FR-vdash-bot', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	171-17435 5 months ago	375-56982 1 year ago	14-58900 14 days
13780	adomani author:adomani	deprecate injective	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	31/9	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,Mathlib/Init/Function.lean,lake-manifest.json,lakefile.lean	7	2	['github-actions', 'grunweg']	nobody	170-71349 5 months ago	466-54693 1 year ago	0-0 0 seconds
11297	mattrobball author:mattrobball	mrb/cover data fields	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	949/657	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Associated.lean,Mathlib/Algebra/Category/MonCat/Colimits.lean,Mathlib/Algebra/Category/Ring/Colimits.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Group/Aut.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/TypeTags.lean,Mathlib/Algebra/Group/Units.lean,Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/Lie/NonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Module/Basic.lean,Mathlib/Algebra/Module/Equiv.lean,Mathlib/Algebra/Module/LocalizedModule.lean,Mathlib/Algebra/Order/Group/Cone.lean,Mathlib/Algebra/Order/Interval.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/PEmptyInstances.lean,Mathlib/Algebra/Quandle.lean,Mathlib/Algebra/Ring/Aut.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/Opposite.lean,Mathlib/Algebra/Ring/Pi.lean,Mathlib/Algebra/Ring/ULift.lean,Mathlib/Algebra/SMulWithZero.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/NormedSpace/ContinuousAffineMap.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Extension.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Basic.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Deriv.lean,Mathlib/CategoryTheory/Endomorphism.lean,Mathlib/CategoryTheory/Groupoid/VertexGroup.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/Combinatorics/Quiver/SingleObj.lean,Mathlib/Combinatorics/Quiver/Symmetric.lean,Mathlib/Combinatorics/Young/YoungDiagram.lean,Mathlib/Control/Applicative.lean,Mathlib/Control/Basic.lean,Mathlib/Control/Functor.lean,Mathlib/Control/Monad/Cont.lean,Mathlib/Control/ULift.lean,Mathlib/Data/Erased.lean,Mathlib/Data/Int/Basic.lean,Mathlib/Data/Int/Cast/Prod.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Order/Basic.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/PSigma/Order.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/Data/Sigma/Order.lean,Mathlib/Data/Sign.lean,Mathlib/Data/Sum/Lattice.lean,Mathlib/Data/Sum/Order.lean,Mathlib/Data/TwoPointing.lean,Mathlib/Data/ZMod/Defs.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/Opposite.lean,Mathlib/GroupTheory/GroupAction/Option.lean,Mathlib/GroupTheory/GroupAction/Prod.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/Pointwise.lean,Mathlib/GroupTheory/GroupAction/Units.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/GroupTheory/Perm/Basic.lean,Mathlib/GroupTheory/Subgroup/Basic.lean,Mathlib/GroupTheory/Submonoid/Operations.lean,Mathlib/GroupTheory/Submonoid/Pointwise.lean,Mathlib/GroupTheory/Subsemigroup/Operations.lean,Mathlib/Init/Data/Int/Order.lean,Mathlib/Init/Data/List/Instances.lean,Mathlib/Init/Data/Nat/Lemmas.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/Logic/Nontrivial/Basic.lean,Mathlib/Logic/Unique.lean,Mathlib/MeasureTheory/Integral/Bochner.lean	120	13	['YaelDillies', 'grunweg', 'leanprover-bot', 'mattrobball']	nobody	170-70901 5 months ago	569-15173 1 year ago	0-0 0 seconds
12673	grunweg author:grunweg	feat: add ContDiff.lipschitzOnWith	A C¹ function is Lipschitz on each convex compact set. From sphere-eversion. -------- Commits can be reviewed independently. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict awaiting-author help-wanted	30/11	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean	1	6	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'sgouezel']	nobody	169-40412 5 months ago	169-40412 5 months ago	1-7552 1 day
20567	grunweg author:grunweg	feat(Cache): two small features	- add an informational message to the get command (when run without arguments): when more than 80% of all cache files present were not used in the last command, tell the user about the `clean` command --- - [ ] depends on #20568 (for the first feature) - [ ] TODO: re-design this feature and the clean command: if there are N local copies of mathlib, cache should have a pointer to all of them - to avoid clearing all N-1 from inside the last local copy [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	38/2	Cache/Main.lean	1	11	['Julian', 'arthurpaulino', 'fpvandoorn', 'github-actions', 'grunweg']	nobody	169-21762 5 months ago	169-21762 5 months ago	1-17369 1 day
20313	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Data/Complex/Exponential): prove some useful results about the complex exponential.	This PR proves two basic results about the complex exponential: * `abs_exp_mul_I (x : ℂ) : abs (Complex.exp (I * x)) = Real.exp (-x.im)` * `one_sub_rexp_re_le_abs_one_sub_cexp (x : ℂ) : 1 - Real.exp x.re ≤ Complex.abs (1 - Complex.exp x)` Both results were proved as part of the sphere packing project. There's a chance they're too specific for mathlib, but I thought they were worth PRing anyway. Would it also be a good idea to tag `abs_exp_mul_I` with `simp`? Feedback/suggestions welcome. Note: `one_sub_rexp_re_le_abs_one_sub_cexp` was proved by Bhavik Mehta @b-mehta --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict	167/141	Mathlib.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/ERealExp.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev.lean,Mathlib/Data/Complex/Exponential/Defs.lean,Mathlib/Data/Complex/Exponential/Lemmas.lean,Mathlib/Data/Complex/ExponentialBounds.lean,Mathlib/Tactic/FunProp.lean,MathlibTest/Recall.lean,MathlibTest/positivity.lean	10	12	['b-mehta', 'github-actions', 'kim-em', 'thefundamentaltheor3m', 'trivial1711']	nobody	169-21728 5 months ago	169-21728 5 months ago	25-60481 25 days
22698	Kiolt author:Kiolt	feat: notation for whisker(Left/Right)Iso	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-category-theory merge-conflict	175/113	Mathlib/Algebra/Homology/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Bicategory/Basic.lean,Mathlib/CategoryTheory/Bicategory/Coherence.lean,Mathlib/CategoryTheory/Bicategory/Extension.lean,Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Strong.lean,Mathlib/CategoryTheory/Bicategory/SingleObj.lean,Mathlib/CategoryTheory/Closed/Functor.lean,Mathlib/CategoryTheory/Closed/Ideal.lean,Mathlib/CategoryTheory/Enriched/FunctorCategory.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Braided/Reflection.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Monoidal/Preadditive.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/Tactic/CategoryTheory/BicategoricalComp.lean,Mathlib/Tactic/CategoryTheory/Bicategory/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Bicategory/Normalize.lean,Mathlib/Tactic/CategoryTheory/Bicategory/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean	27	21	['Kiolt', 'YaelDillies', 'b-mehta', 'github-actions', 'leanprover-bot']	nobody	169-21557 5 months ago	169-21557 5 months ago	3-36238 3 days
21714	mattrobball author:mattrobball	test		t-order merge-conflict	13/13	Mathlib/Order/Hom/Lattice.lean,lean-toolchain	2	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	169-20406 5 months ago	169-20406 5 months ago	0-0 0 seconds
20730	kuotsanhsu author:kuotsanhsu	feat(LinearAlgebra/Matrix/SchurTriangulation): prove Schur decomposition/triangulation	`Matrix.schur_triangulation` shows that a matrix over an algebraically closed field is unitarily similar to an upper triangular matrix --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict awaiting-author label:t-algebra$	317/2	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/LinearAlgebra/Matrix/SchurTriangulation.lean,Mathlib/Logic/Equiv/Basic.lean	4	14	['eric-wieser', 'github-actions', 'kim-em', 'kuotsanhsu']	nobody	169-17860 5 months ago	169-17860 5 months ago	13-60072 13 days
19117	eric-wieser author:eric-wieser	feat: derivatives of matrix operations	These are finally possible to state after #19108. However, a lot of bundled `ContinuousLinearMap`s are missing. --- - [x] depends on: #19108 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict WIP	336/22	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Matrix.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Matrix.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	167-40238 5 months ago	167-40240 5 months ago	0-0 0 seconds
12605	FR-vdash-bot author:FR-vdash-bot	chore: attribute [induction_eliminator]	Add attribute [induction_eliminator] to `AdjoinRoot.induction_on` `ENat.recTopCoe` `ENNReal.recTopCoe` `Finset.induction` `Magma.AssocQuotient.induction_on` `ManyOneDegree.ind_on` `Module.Ray.ind` (and add `Orientation.ind` for `Orientation`, an abbrev of it. I wish that we do not need to add it in the future.) `Multiset.induction` `MvPolynomial.induction_on` `OnePoint.rec` `Opposite.rec'` `Ordinal.limitRecOn` `PartENat.casesOn` `Polynomial.induction_on'` `QuotientAddGroup.induction_on'` (and add `AddCircle.induction_on` for `AddCircle`, an abbrev of it. I wish that we do not need to add it in the future.) `QuotientGroup.induction_on'` (doesn't actually work) `Real.Angle.induction_on` `SimplexCategory.rec` `Trunc.induction_on` --- - [x] depends on: #13476 - [x] depends on: #13264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	354/342	Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Group/Finset.lean,Mathlib/Algebra/BigOperators/Group/Multiset.lean,Mathlib/Algebra/BigOperators/Ring.lean,Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/GCDMonoid/Multiset.lean,Mathlib/Algebra/Group/Subgroup/Finite.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/Weights/Basic.lean,Mathlib/Algebra/Module/BigOperators.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Derivation.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Eval.lean,Mathlib/Algebra/Polynomial/Induction.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Algebra/Polynomial/PartialFractions.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/Algebra/Tropical/BigOperators.lean,Mathlib/AlgebraicTopology/DoldKan/NCompGamma.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SplitSimplicialObject.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Asymptotics/Asymptotics.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/Deriv/Polynomial.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Analysis/NormedSpace/Exponential.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/PolynomialExp.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/SetFamily/Compression/Down.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SetFamily/HarrisKleitman.lean,Mathlib/Computability/Reduce.lean,Mathlib/Data/DFinsupp/Basic.lean,Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Lattice.lean,Mathlib/Data/Finset/NAry.lean,Mathlib/Data/Fintype/Sum.lean,Mathlib/Data/Multiset/Antidiagonal.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Fold.lean,Mathlib/Data/Multiset/Lattice.lean,Mathlib/Data/Multiset/Pi.lean,Mathlib/Data/Multiset/Powerset.lean,Mathlib/Data/Multiset/Sections.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Set/Pointwise/BigOperators.lean,Mathlib/FieldTheory/IntermediateField.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/RingedSpace/Basic.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace/Gluing.lean,Mathlib/GroupTheory/Coset.lean,Mathlib/GroupTheory/NoncommPiCoprod.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/LinearAlgebra/FiniteDimensional.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/Logic/Hydra.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/Lebesgue.lean,Mathlib/MeasureTheory/Integral/Marginal.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean,Mathlib/MeasureTheory/Measure/AddContent.lean	140	14	['FR-vdash-bot', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	167-34853 5 months ago	453-48779 1 year ago	4-46495 4 days
15099	joelriou author:joelriou	feat(CategoryTheory/Sites): the Mayer-Vietoris long exact sequence in sheaf cohomology	In this PR, we obtain the long exact Mayer-Vietoris sequence in sheaf cohomology `... ⟶ H^n₀(S.X₄, F) ⟶ H^n₀(S.X₂, F) ⊞ H^n₀(S.X₃, F) ⟶ H^n₀(S.X₁, F) ⟶ H^n₁(S.X₄, F) ⟶ ...` when `n₀ + 1 = n₁`. It is attached to any "Mayer-Vietoris square", which includes the typical case of a covering by two open subsets in a topological space. (This API shall also apply to the case of Nisnevich distinguished squares of schemes.) --- - [x] depends on: #15770 - [x] depends on: #14793 - [x] depends on: #14515 - [x] depends on: #15092 - [x] depends on: #15053 - [x] depends on: #14867 - [x] depends on: #14959 - [x] depends on: #14957 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	348/4	Mathlib.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Biprod.lean,Mathlib/CategoryTheory/Preadditive/Opposite.lean,Mathlib/CategoryTheory/Shift/Basic.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/Basic.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/MayerVietoris.lean	8	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	164-64700 5 months ago	unknown	unknown
23859	urkud author:urkud	feat(Topology/../Order/Field): generalize to `Semifield`	.. from a linear ordered field to a linear ordered semifield--- - [ ] depends on: #23857 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	245/219	Mathlib/Algebra/Order/Group/Pointwise/Interval.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Topology/Algebra/Order/Field.lean,Mathlib/Topology/Order/Basic.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	164-60676 5 months ago	164-60679 5 months ago	0-265 4 minutes
23810	b-reinke author:b-reinke	chore(Order/Interval): generalize succ/pred lemmas to partial orders	Many lemmas in `Mathlib/Order/Interval/Set/SuccPred.lean`and `Mathlib/Order/Interval/Finset/SuccPred.lean` also work for partial orders. They are generalized in this PR by introducing different sections for `PartialOrder` and `LinearOrder` assumptions in the respective files. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	231/89	Mathlib/Order/Interval/Finset/SuccPred.lean,Mathlib/Order/Interval/Set/SuccPred.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	162-37451 5 months ago	162-37453 5 months ago	16-29623 16 days
24285	madvorak author:madvorak	chore(Algebra/*-{Category,Homology}): remove unnecessary universe variables	Discussions: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Call.20for.20help.3A.20technical.2F.20organisational.20debt/with/513620128 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Algebra.20and.20.60Type.60/with/513558902 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Task.2026.3A.20Replace.20Type.20u.20by.20Type.20wherever.20possible/with/513592993 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	542/916	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Field.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Central/Basic.lean,Mathlib/Algebra/Central/Defs.lean,Mathlib/Algebra/Central/TensorProduct.lean,Mathlib/Algebra/CharP/Pi.lean,Mathlib/Algebra/CharP/Quotient.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Finsupp.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/Algebra/Field/MinimalAxioms.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/FreeNonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Finite.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Invertible/Defs.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/TypeTags/Finite.lean,Mathlib/Algebra/Group/TypeTags/Hom.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/Group/WithOne/Basic.lean,Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Pi.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/NeZero.lean,Mathlib/Algebra/Lie/Abelian.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/CartanMatrix.lean,Mathlib/Algebra/Lie/CartanSubalgebra.lean,Mathlib/Algebra/Lie/Character.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/DirectSum.lean,Mathlib/Algebra/Lie/Free.lean,Mathlib/Algebra/Lie/Ideal.lean,Mathlib/Algebra/Lie/IdealOperations.lean,Mathlib/Algebra/Lie/Matrix.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/NonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Solvable.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/Algebra/Lie/UniversalEnveloping.lean,Mathlib/Algebra/Module/Basic.lean,Mathlib/Algebra/Module/CharacterModule.lean,Mathlib/Algebra/Module/DedekindDomain.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/Equiv/Opposite.lean,Mathlib/Algebra/Module/Lattice.lean,Mathlib/Algebra/Module/LinearMap/Basic.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/MinimalAxioms.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Module/Opposite.lean,Mathlib/Algebra/Module/Pi.lean,Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/CommRing.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean	182	22	['erdOne', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'madvorak', 'mattrobball']	nobody	162-26148 5 months ago	162-26149 5 months ago	2-12022 2 days
8370	eric-wieser author:eric-wieser	refactor(Analysis/NormedSpace/Exponential): remove the `𝕂` argument from `exp`	This argument is still needed for almost all the lemmas, which means it can longer be found by unification. We keep around `expSeries 𝕂 A`, as it's needed for talking about the radius of convergence over different base fields. This is a prerequisite for #8372, as we can't merge the functions until they have the same interface.\ Zulip thread: [#mathlib4 > Real.exp @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Real.2Eexp/near/401602245) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This is started from the mathport output on https://github.com/leanprover-community/mathlib/pull/19244	awaiting-zulip t-analysis merge-conflict	432/387	Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/Analysis/Normed/Algebra/QuaternionExponential.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/NormedSpace/DualNumber.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean	11	29	['YaelDillies', 'eric-wieser', 'girving', 'github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-community-bot-assistant', 'urkud']	nobody	162-7078 5 months ago	173-35708 5 months ago	29-60989 29 days
14931	eric-wieser author:eric-wieser	feat: volume of a simplex	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry merge-conflict	207/0	Mathlib/Geometry/Euclidean/Basic.lean,Mathlib/Geometry/Euclidean/Circumcenter.lean,Mathlib/Geometry/Euclidean/Volume.lean	3	3	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	160-38605 5 months ago	160-38607 5 months ago	0-0 0 seconds
22583	imathwy author:imathwy	feat: affinespace homeomorphism	There exists a homeomorphism (a continuous bijection with a continuous inverse) between an affine subspace s of a vector space V over a field 𝕜 and its direction s.direction , given a chosen point z ∈ s . --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	64/2	Mathlib/Analysis/Normed/Group/AddTorsor.lean,Mathlib/LinearAlgebra/AffineSpace/ContinuousAffineEquiv.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/MulAction.lean	4	6	['JovanGerb', 'eric-wieser', 'github-actions', 'grunweg']	nobody	160-36323 5 months ago	200-81416 6 months ago	0-18122 5 hours
24243	Timeroot author:Timeroot	feat(Analysis/Calculus/FDeriv): Fderiv on torsors	Experiment to see how this goes for now, see [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Upgrade.20.60fderiv.60.20to.20.60AddTorsor.60) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	539/447	Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Prod.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Bilinear.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/FDeriv/Linear.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/Gradient/Basic.lean,Mathlib/Analysis/Calculus/LineDeriv/Basic.lean,Mathlib/Analysis/Calculus/LocalExtr/Basic.lean,Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/Analysis/Calculus/Rademacher.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Periodic.lean,Mathlib/Analysis/Complex/RealDeriv.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/SpecialFunctions/ExpDeriv.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/EulerSineProd.lean,Mathlib/Geometry/Manifold/IntegralCurve/Transform.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/NumberTheory/EulerProduct/ExpLog.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean,Mathlib/NumberTheory/LSeries/Nonvanishing.lean,MathlibTest/Recall.lean	37	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	159-19461 5 months ago	159-19462 5 months ago	0-0 0 seconds
24322	mattrobball author:mattrobball	chore: merge repeated `Type*` binders	Per the discussion on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Task.2026.3A.20Replace.20Type.20u.20by.20Type.20wherever.20possible), this PR merges `(A : Type) (B : Type u)` into `(A B : Type*)` and similarly for `{}`. NOTE: the Python script used it currently in the `/scripts` folder. It is there for inspection and should be removed before merging this PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	685/591	Archive/Imo/Imo2019Q2.lean,Archive/Wiedijk100Theorems/HeronsFormula.lean,Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/Faithful.lean,Mathlib/Algebra/Group/Action/Sigma.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Algebra/Group/Support.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/Prod.lean,Mathlib/Algebra/Module/Prod.lean,Mathlib/Algebra/Module/Submodule/EqLocus.lean,Mathlib/Algebra/Module/Submodule/Equiv.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/LinearMap.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Comap.lean,Mathlib/Algebra/MvPolynomial/Monad.lean,Mathlib/Algebra/Notation/Prod.lean,Mathlib/Algebra/Order/Quantale.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Quandle.lean,Mathlib/Algebra/QuaternionBasis.lean,Mathlib/Algebra/Ring/CompTypeclasses.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/Star/Module.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/Algebra/Vertex/HVertexOperator.lean,Mathlib/Algebra/Vertex/VertexOperator.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Convex/Cone/Proper.lean,Mathlib/Analysis/Convex/EGauge.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Defs.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/InnerProductSpace/Orthonormal.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/WeakOperatorTopology.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Algebra/Basic.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Ring/InfiniteSum.lean,Mathlib/Analysis/Normed/Ring/Lemmas.lean,Mathlib/Analysis/NormedSpace/ConformalLinearMap.lean,Mathlib/Analysis/NormedSpace/ENormedSpace.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Bilinear.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/GradedObject.lean	343	3	['github-actions', 'leanprover-community-bot-assistant', 'urkud']	nobody	159-18939 5 months ago	159-18941 5 months ago	2-7052 2 days
23138	grunweg author:grunweg	feat: (unoriented) bordism groups	We define the unoriented bordism group of a topological space and prove that it is an abelian group: we don't prove transitivity of bordisms yet, as that requires the collar neighbourhood theorem and gluing of smooth manifolds, which are both not in mathlib and a sizable piece of work. --- This PR is not ready for review yet; I'm merely opening this to track this branch' state better. In particular, this PR depends on several preliminary PRs: - depends on: #15906 for defining singular n-manifolds - depends on: #23040: define immersions and smooth embeddings: in finite dimensions, these are easy to describe; for mathlib, we will want a correct definition for e.g. Banach manifolds also. - depends on: #22059 defines manifolds with smooth boundary. That PR has two open dependencies; one is slowly getting merged, that other has a few sorries I still need to prove (not difficult). - depends on: #22874 for some constructions - defining unoriented bordisms, and proving some basic constructions about them: will be another PR [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict WIP	1316/3	Mathlib.lean,Mathlib/Geometry/Manifold/Bordisms.lean,Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/HasSmoothBoundary.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean	7	0	[]	nobody	158-53833 5 months ago	196-30114 6 months ago	0-1 1 second
23593	erdOne author:erdOne	feat(AlgebraicGeometry): the tilde construction is functorial	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict awaiting-author	95/38	Mathlib/AlgebraicGeometry/Modules/Sheaf.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean	2	4	['chrisflav', 'github-actions', 'leanprover-community-bot-assistant']	nobody	158-53519 5 months ago	158-53521 5 months ago	0-71091 19 hours
21065	eric-wieser author:eric-wieser	feat: generalize `tangentConeAt.lim_zero` to TVS	... and then adjust the `variable`s down the rest of the file to make use of the generality. There are two key lemmas that this does not generalize, which would probably unlock the rest of the file: * `subset_tangentCone_prod_left` (and `_right`) * `zero_mem_tangentCone` --- - [ ] depends on: #20859 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict WIP	55/28	Mathlib/Analysis/Calculus/TangentCone.lean	1	16	['ADedecker', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	158-45923 5 months ago	158-45925 5 months ago	23-20319 23 days
22721	grunweg author:grunweg	chore(MeasureTheory/Function/LpSeminorm/Basic): generalise more results to enorm classes	Done for the Carleson project. --- - depends on #22708 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson t-measure-probability merge-conflict WIP	134/10	Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	157-38591 5 months ago	157-38593 5 months ago	0-6 6 seconds
24354	grunweg author:grunweg	chore(HasFiniteIntegral): rename three lemmas	Discovered in #24343. --- - [ ] depends on: #24343 (to avoid merge conflicts) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict	108/30	Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	157-30552 5 months ago	157-30553 5 months ago	0-4604 1 hour
23791	SEU-Prime author:SEU-Prime	Create AmiceTrans.lean	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-number-theory merge-conflict WIP	2963/0	Mathlib.lean,Mathlib/Analysis/Normed/Ring/Lemmas2.lean,Mathlib/NumberTheory/Padics/AmiceTrans.lean,Mathlib/NumberTheory/Padics/PSAC.lean,Mathlib/NumberTheory/Padics/PSAC2.lean,Mathlib/NumberTheory/Padics/PSAC3.lean,Mathlib/NumberTheory/Padics/PiGammainPS.lean,Mathlib/NumberTheory/Padics/PsiandVar.lean,Mathlib/RingTheory/AdicCompletion/Lemma.lean,Mathlib/RingTheory/PowerSeries/Comp.lean,Mathlib/Topology/ContinuousMap/ZeroAtBot.lean	11	3	['SEU-Prime', 'github-actions', 'leanprover-community-bot-assistant']	nobody	156-77872 5 months ago	163-56878 5 months ago	0-0 0 seconds
24091	mattrobball author:mattrobball	test		merge-conflict	97/46	Mathlib/Algebra/Field/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/Normed/Affine/AddTorsor.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/Span.lean,Mathlib/Analysis/Normed/MulAction.lean,Mathlib/Analysis/NormedSpace/Pointwise.lean,Mathlib/Dynamics/BirkhoffSum/NormedSpace.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/Topology/ContinuousMap/Compact.lean,Mathlib/Topology/MetricSpace/Holder.lean,Mathlib/Topology/MetricSpace/HolderNorm.lean,docs/overview.yaml,docs/undergrad.yaml	15	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	156-67290 5 months ago	156-67292 5 months ago	0-0 0 seconds
14731	adomani author:adomani	feat: the repeated typeclass assumption linter	[#mathlib4 > recyclable variables @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/recyclable.20variables/near/451167963) also [#mathlib4 > Normed modules @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Normed.20modules/near/512242167) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict WIP	178/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/DependentTypeclass.lean,MathlibTest/DependentTypeclass.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	156-43830 5 months ago	168-61232 5 months ago	0-109 1 minute
24140	mattrobball author:mattrobball	test		merge-conflict	176/91	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Data/Complex/Module.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/RingTheory/Algebraic/Integral.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/RingHom/Unramified.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	17	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	156-42293 5 months ago	156-42295 5 months ago	0-0 0 seconds
13649	FR-vdash-bot author:FR-vdash-bot	chore: redefine `Nat.div2` `Nat.bodd`	The new definitions are faster than the old ones. `Nat.binaryRec` will be moved to batteries (https://github.com/leanprover-community/batteries/pull/799) or core (https://github.com/leanprover/lean4/pull/3756), so relevant contents are moved to a new file temporarily. --- - [x] depends on: #15567 - [x] depends on: #19666 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	63/88	Mathlib/Computability/Primrec.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Size.lean,Mathlib/Logic/Denumerable.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Nat.lean	8	15	['FR-vdash-bot', 'digama0', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	digama0 assignee:digama0	154-9698 5 months ago	154-9700 5 months ago	87-51692 87 days
22856	mattrobball author:mattrobball	test		merge-conflict	8/2	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/RCLike/Inner.lean,Mathlib/FieldTheory/Galois/Profinite.lean	4	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	153-83659 5 months ago	153-83661 5 months ago	0-0 0 seconds
23921	alreadydone author:alreadydone	Jyxu/projective trace	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	157/123	Mathlib/FieldTheory/CardinalEmb.lean,Mathlib/FieldTheory/Relrank.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/RingTheory/LocalProperties/Projective.lean	5	1	['leanprover-community-bot-assistant']	nobody	153-68875 5 months ago	153-68875 5 months ago	0-0 0 seconds
21252	ADedecker author:ADedecker	feat: redefine uniformly convex normed spaces with filters instead of epsilons	And conceptualize some proofs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	301/87	Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Topology/Algebra/UniformGroup/Defs.lean,Mathlib/Topology/Algebra/UniformMulAction.lean	6	1	['github-actions']	nobody	153-68614 5 months ago	153-68614 5 months ago	0-0 0 seconds
19821	eric-wieser author:eric-wieser	feat: add a Qq version of AtomM that groups by type	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta merge-conflict WIP	332/30	Mathlib/Data/Ineq.lean,Mathlib/Tactic/Linarith/Datatypes.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm.lean,Mathlib/Tactic/Linarith/Preprocessing.lean,Mathlib/Util/AtomM.lean,Mathlib/Util/Qq.lean	6	1	['github-actions']	nobody	153-68427 5 months ago	153-68427 5 months ago	0-0 0 seconds
19520	erdOne author:erdOne	refactor(Algebra/Module): Redefine `LocalizedModule` in terms of `OreLocalization`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	610/493	Mathlib.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Module.lean,Mathlib/RingTheory/OreLocalization/Ring.lean	10	1	['github-actions']	nobody	153-68416 5 months ago	153-68416 5 months ago	8-56155 8 days
19120	hrmacbeth author:hrmacbeth	feat: stop `ring`/`abel` from seeing algebraic operations inside `let`s	This draft PR illustrates a feature I would like to see in core: a variant of `whnf` which allows particular kinds of reduction, such as zeta-delta reduction, to be turned off. Here it is used to make ring-normalization and abelian-group-normalization a bit more responsive to what (I think) users expect: these normalizations would no longer look inside user-defined lets to see algebraic operations in those expressions. Note: In Lean/Mathlib 3, `ring` matched for algebraic operations on an algebraic expression `e` itself, not on `← whnfR e`. So mathlib3 `ring` didn't see algebraic operations inside `let`s -- but it also didn't see algebraic operations requiring beta-reduction (like `(fun t ↦ t + 1) x`) or see inside abbreviations. [Zulip](https://leanprover.zulipchat.com/#narrow/channel/239415-metaprogramming-.2F-tactics/topic/whnf.20variant.20which.20preserves.20let-bindings) Update: fortuitously, it looks like the new core PR https://github.com/leanprover/lean4/pull/6053 will provide this feature! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict blocked-by-core-PR	137/15	Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Mathlib.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Integrals.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Data/Real/Pi/Irrational.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaOdd.lean,Mathlib/NumberTheory/SumPrimeReciprocals.lean,Mathlib/RingTheory/WittVector/DiscreteValuationRing.lean,Mathlib/Tactic/Abel.lean,Mathlib/Tactic/Polyrith.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Tactic/Ring/RingNF.lean,Mathlib/Topology/MetricSpace/GromovHausdorff.lean,Mathlib/Util/WHNF.lean,MathlibTest/abel.lean,MathlibTest/ring.lean	21	5	['JovanGerb', 'github-actions', 'grunweg', 'hrmacbeth']	nobody	153-68407 5 months ago	153-68407 5 months ago	0-0 0 seconds
17069	yuma-mizuno author:yuma-mizuno	chore(CategoryTheory/Functor/Basic): put `simp` at `Functor.id_comp`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	41/30	Mathlib/CategoryTheory/Adjunction/Mates.lean,Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/CategoryTheory/GuitartExact/VerticalComposition.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Shift/CommShift.lean	5	3	['github-actions', 'leanprover-bot', 'yuma-mizuno']	nobody	153-68397 5 months ago	153-68397 5 months ago	0-0 0 seconds
15024	mattrobball author:mattrobball	chore(Algebra.Basic): scope and rename universal `Nat`-algebra and `Int`-algebra instances	We rename `algebraNat` to `Nat.instAlgebraOfSemiring` and `algebraInt` to `Int.instAlgebraOfRing` to be consistent with existing naming conventions. We also scope them to avoid typeclass search tripping over them unnecessarily. --- Moves: - algebraNat -> Nat.instAlgebraOfSemiring - algebraInt -> Int.instAlgebraOfRing [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	178/27	Archive/Wiedijk100Theorems/AbelRuffini.lean,Counterexamples/Pseudoelement.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Unitization.lean,Mathlib/Algebra/Category/ModuleCat/Injective.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Module/Bimodule.lean,Mathlib/Algebra/Module/Zlattice/Basic.lean,Mathlib/Algebra/MvPolynomial/Counit.lean,Mathlib/Algebra/MvPolynomial/Supported.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/DenomsClearable.lean,Mathlib/Algebra/Polynomial/UnitTrinomial.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Data/Matrix/Kronecker.lean,Mathlib/Data/Real/Irrational.lean,Mathlib/FieldTheory/IsAlgClosed/Classification.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/LinearAlgebra/FreeModule/IdealQuotient.lean,Mathlib/LinearAlgebra/FreeProduct/Basic.lean,Mathlib/LinearAlgebra/Matrix/Adjugate.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/TensorAlgebra/Basic.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleCardPowDegree.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/Cyclotomic/Basic.lean,Mathlib/NumberTheory/Cyclotomic/Discriminant.lean,Mathlib/NumberTheory/Cyclotomic/Rat.lean,Mathlib/NumberTheory/FLT/Three.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticChar/GaussSum.lean,Mathlib/NumberTheory/Liouville/Basic.lean,Mathlib/NumberTheory/Liouville/LiouvilleNumber.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Defs.lean,Mathlib/NumberTheory/ModularForms/Identities.lean,Mathlib/NumberTheory/ModularForms/JacobiTheta/OneVariable.lean,Mathlib/NumberTheory/ModularForms/SlashActions.lean,Mathlib/NumberTheory/ModularForms/SlashInvariantForms.lean,Mathlib/NumberTheory/MulChar/Lemmas.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/NumberTheory/NumberField/ClassNumber.lean,Mathlib/NumberTheory/NumberField/Discriminant.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/FractionalIdeal.lean,Mathlib/NumberTheory/NumberField/Norm.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/RepresentationTheory/Maschke.lean,Mathlib/RingTheory/Adjoin/Basic.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/Discriminant.lean,Mathlib/RingTheory/FractionalIdeal/Norm.lean,Mathlib/RingTheory/Ideal/Norm.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Expand.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Roots.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/Polynomial/Hermite/Gaussian.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean,Mathlib/RingTheory/RootsOfUnity/Lemmas.lean,Mathlib/RingTheory/RootsOfUnity/Minpoly.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/Trace/Basic.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/RingTheory/WittVector/Defs.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/InitTail.lean,Mathlib/RingTheory/WittVector/IsPoly.lean,Mathlib/RingTheory/WittVector/MulP.lean,Mathlib/RingTheory/WittVector/StructurePolynomial.lean,Mathlib/RingTheory/WittVector/Verschiebung.lean	80	6	['eric-wieser', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	153-68386 5 months ago	153-68386 5 months ago	0-0 0 seconds
14803	StevenClontz author:StevenClontz	chore: use `Disjoint` nhd filters for all separation axioms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	157/122	Mathlib/Topology/Separation.lean	1	1	['github-actions']	nobody	153-68381 5 months ago	153-68382 5 months ago	0-0 0 seconds
14675	adomani author:adomani	dev: the repeated variable linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict WIP	71/0	Mathlib/Tactic/Linter/Lint.lean	1	1	['github-actions']	nobody	153-68376 5 months ago	153-68376 5 months ago	0-8 8 seconds
14330	Ruben-VandeVelde author:Ruben-VandeVelde	chore: split Mathlib.Algebra.Star.Basic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	446/331	Mathlib.lean,Mathlib/Algebra/Module/LinearMap/Star.lean,Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/BigOperators.lean,Mathlib/Algebra/Star/Defs.lean,Mathlib/Algebra/Star/Lemmas.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Star/Pi.lean,Mathlib/Algebra/Star/Pointwise.lean,Mathlib/Algebra/Star/Rat.lean,Mathlib/Algebra/Star/Regular.lean,Mathlib/Algebra/Star/StarRingHom.lean,Mathlib/Analysis/NormedSpace/LinearIsometry.lean,Mathlib/Data/Complex/Basic.lean,scripts/noshake.json	15	3	['github-actions', 'grunweg', 'j-loreaux']	nobody	153-68336 5 months ago	153-68362 5 months ago	0-45204 12 hours
14023	mattrobball author:mattrobball	perf(RingTheory.OreLocalization): make data irreducible	We generally do not want to unfold operations passing through `Quotient` if we can avoid it for performance reasons. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	43/32	Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Ring.lean	3	5	['github-actions', 'grunweg', 'leanprover-bot', 'mattrobball']	nobody	153-68231 5 months ago	461-58054 1 year ago	0-0 0 seconds
14007	adomani author:adomani	test: papercut linter working on all mathlib	This PR is a testing ground for potential issues with the papercut linter #13999. It is not intended to be merged. The linter is active on all of mathlib, to make sure that the linter does not throw errors, but only emits warnings! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict WIP	249/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/Papercut.lean,test/Papercut.lean	5	1	['github-actions']	nobody	153-68221 5 months ago	153-68221 5 months ago	0-0 0 seconds
20354	eric-wieser author:eric-wieser	feat: generalize `ContinuousLinearMap.curry` to TVS	Follow on from #10777 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	57/25	Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean	1	3	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	153-68156 5 months ago	153-68156 5 months ago	0-0 0 seconds
11523	thorimur author:thorimur	bench: test syntax linter	--- The purpose of this PR is just to bench the "best-case scenario" for a linter which iterates through syntax, updating and checking a simple counter along the way. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	22/0	Mathlib.lean,Mathlib/Command/Linter.lean,Mathlib/Tactic/Common.lean	3	3	['grunweg', 'leanprover-bot', 'thorimur']	nobody	153-68065 5 months ago	153-68065 5 months ago	0-0 0 seconds
8511	eric-wieser author:eric-wieser	refactor(MeasureTheory/Measure/Haar/Basic): partially generalize to the affine case	Without a `Mul` version of `AddTorsor`, this generalization can only go so far. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict awaiting-author	52/46	Mathlib/MeasureTheory/Measure/Haar/Basic.lean	1	0	[]	nobody	153-67967 5 months ago	153-67967 5 months ago	0-0 0 seconds
7994	ericrbg author:ericrbg	chore: generalize `LieSubalgebra.mem_map_submodule`	--- Not sure if we should rename to something like `mem_map_iff_mem_map_submodule` or not. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict please-adopt label:t-algebra$	16/4	Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Subalgebra.lean	2	3	['eric-wieser', 'ericrbg']	nobody	153-67955 5 months ago	153-67955 5 months ago	0-0 0 seconds
6317	eric-wieser author:eric-wieser	refactor(Data/Finsupp/Defs): make Finsupp.single defeq to Pi.single	By adding a `DecidableEq ι` argument to `Finsupp.single`, we remove the reference to `Classical.decEq ι` in the definition, which in turn means that when coerced to a function it is now defeq to `Pi.single`. This also brings it in line with `DFinsupp.single`. This does not go as far as making `Finsupp.single` computable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict WIP	269/226	Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Data/Finsupp/AList.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Fintype.lean,Mathlib/Data/Finsupp/Indicator.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Finsupp/ToDFinsupp.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/LinearAlgebra/Finsupp.lean	12	0	[]	nobody	153-67949 5 months ago	153-67949 5 months ago	0-0 0 seconds
6277	jjaassoonn author:jjaassoonn	Dimension theory	Some results are - The ring Krull dimension and the topological dimension of the prime spectrum of a ring are the same - A field is zero-dimensional and a PID that is not a field is one dimensional - An Artinian ring is zero-dimensional - The Krull dimension of ring $R$ is equal to the supremum of heights of maximal ideals [00KG](https://stacks.math.columbia.edu/tag/00KG) - two definitions of module length agree - A module is finite length iff both artinian and noetherian - length of module $M$ is equal to the sum of length of $N$ and length of $M / N$ where $N$ is a submodule of $M$. - Noetherian ring has only finitely many minimal primes #9088 - In a zero dimensional ring, prime ideals are maximal - Artinian rings has finitely many maximal ideals #9087 - zero-dimensional rings with finitely many prime ideals are products of its localizations: $R \cong \prod_{\mathfrak{p}}R_{\mathfrak{p}}$ - Let $M_0 \le ... \le M_n$, then $l(M_n/ M_0) = l(M_1/M_0) + l(M_2/M_1) + ... + l(M_n/M_{n-1})$ where $l$ denotes module length. - If $f : R \to S$ is a ring homomorphism and $M$ an $S$-module, then $l_R(M) \le l_S(M)$, when $f$ is surjective then they are equal. (Note that this is expressed using `[Algebra R S]` and `RestrictScalars R S M`, instead of a literal ring hom) - Artinian rings are noetherian ring of dimension 0. - For 0-dimensional local ring, its maximal ideal is locally nilpotent - In notherian ring, $I \le \sqrt{J}$ implies $I ^ n \le J$ for some $n$ --- - [x] depends on: #6309 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	3289/459	Mathlib.lean,Mathlib/Algebra/Module/Length.lean,Mathlib/Algebra/Module/Submodule/JordanHolder.lean,Mathlib/Algebra/PUnitInstances.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/ArtinianAndNoetherian.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Dedup.lean,Mathlib/Data/List/Nodup.lean,Mathlib/LinearAlgebra/Quotient.lean,Mathlib/Order/Cover.lean,Mathlib/Order/JordanHolder.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/ListOnPartialOrderTypes.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Order/RelSeries.lean,Mathlib/RingTheory/Artinian.lean,Mathlib/RingTheory/Finiteness.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Pi.lean,Mathlib/RingTheory/KrullDimension.lean,Mathlib/RingTheory/Noetherian.lean,Mathlib/RingTheory/SimpleModule.lean,Mathlib/Topology/KrullDimension.lean,Mathlib/Topology/Sheaves/SheafCondition/EqualizerProducts.lean	24	11	['alreadydone', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	153-67944 5 months ago	585-37957 1 year ago *	0-0 0 seconds *
4979	mhk119 author:mhk119	doc(Data/Nat/Bitblast): initial commit	Initial commit of Bitblast.lean where we prove equivalence of bitblast unsigned less than and bitblast addition. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	202/4	Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Pow.lean	3	49	['ChrisHughes24', 'digama0', 'goens', 'grunweg', 'j-loreaux', 'kim-em', 'mhk119']	nobody	153-67933 5 months ago	153-67933 5 months ago	7-68358 7 days
8536	jjaassoonn author:jjaassoonn	characteristic predicate of tensor product	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	399/7	Mathlib/Algebra/Category/AlgebraCat/Monoidal.lean,Mathlib/LinearAlgebra/IsTensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean	4	12	['alreadydone', 'eric-wieser', 'jjaassoonn']	nobody	153-67897 5 months ago	153-67897 5 months ago	0-0 0 seconds
11524	mcdoll author:mcdoll	refactor: Introduce type-class for SchwartzMap	--- There are a lot of other refactors to do (`seminormAux` should have a nicer name and gobble up more theorems from `seminorm`), then one can prove `integrable` and friends with only `SchwartzMapClass`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict WIP	139/137	Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Topology/ContinuousFunction/ZeroAtInfty.lean	3	0	[]	nobody	153-67863 5 months ago	153-67863 5 months ago	0-0 0 seconds
9819	jjaassoonn author:jjaassoonn	fg graded ring	1. if $A$ is a noetherian graded ring, then $A_0$ is a noetherian subring of $A$ and $A$ is a finitely generated algebra over $A_0$, if $M$ is a finitely generated graded module over $A$, then each $M_n$ is a finitely generated module over $A_0$. 2. Definition of additive functions over any abelian category: if $C$ is an abelian category, a function $f : C \to \mathbb Z$ is said to be additive, if $f(y) = f(x) + f(z)$ whenever $0\to x \to y \to z \to 0$ is exact. proved some basic properties such as $f(0) = 0$ and $f(x) = f(y)$ whenever $x \cong y$ and interaction of $f$ with longer exact sequences 3. The category of finitely generated module over noetherian ring is abelian 4. A proof of Hilbert-Serre theorem: the Poincare series is actually of the form $\frac{p}{\prod(1- X^i)}$ where $p$ is polynomial The code works, but poorly written. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	6745/217	Mathlib.lean,Mathlib/Algebra/Category/FGModuleCat/Abelian.lean,Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/FGModuleCat/EpiMono.lean,Mathlib/Algebra/Category/FGModuleCat/Kernels.lean,Mathlib/Algebra/Category/FGModuleCat/Limits.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/HilbertSerre/AdditiveFunction.lean,Mathlib/Algebra/HilbertSerre/FiniteInstances.lean,Mathlib/Algebra/HilbertSerre/HilbertPolynomial.lean,Mathlib/Algebra/HilbertSerre/Theorem.lean,Mathlib/Algebra/Module/GradeZeroModule.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Finiteness.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousIdeal.lean,Mathlib/RingTheory/GradedAlgebra/Noetherian.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,Mathlib/RingTheory/GradedAlgebra/Subgrading.lean,Mathlib/RingTheory/Polynomial/Hilbert.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/WellKnown.lean	25	n/a	['FMLJohn', 'github-actions']	nobody	153-67845 5 months ago	unknown	unknown
13543	adomani author:adomani	test: automatically undeprecate	A test for `update_deprecations`. There are two files with deprecated declarations, but CI automatically fixes them, so that they pass the noisy tests (as well as passing fail-on-warning `lake build`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	345/4	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/UpdateDeprecations.lean,Mathlib/test_depr.lean,Mathlib/test_depr_no_change.lean,lakefile.lean,scripts/update_deprecations.lean,test/UpdateDeprecations.lean	12	0	[]	nobody	153-67696 5 months ago	153-67696 5 months ago	0-0 0 seconds
14932	eric-wieser author:eric-wieser	chore: add nndist versions of lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	108/1	Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Geometry/Euclidean/Basic.lean	2	1	['github-actions']	nobody	153-67509 5 months ago	153-67509 5 months ago	0-0 0 seconds
22269	Thmoas-Guan author:Thmoas-Guan	chore(Algebra): replace Submodule.quotient.mk with Submodule.mkQ	Replace Submodule.quotient.mk with Submodule.mkQ as much as possible as it have better composition property and more direct lemmas, making it more similarly with `Ideal.Quotient.mk` (except Algebra.Lie.Quotient.Basic for ones more familiar with these area) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	431/218	Mathlib/Algebra/Exact.lean,Mathlib/Algebra/Module/CharacterModule.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/LinearAlgebra/Dimension/Constructions.lean,Mathlib/LinearAlgebra/Dimension/RankNullity.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/LinearAlgebra/Quotient/Pi.lean,Mathlib/LinearAlgebra/SModEq.lean,Mathlib/LinearAlgebra/Semisimple.lean,Mathlib/LinearAlgebra/TensorProduct/Quotient.lean,Mathlib/LinearAlgebra/TensorProduct/RightExactness.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Exactness.lean,Mathlib/RingTheory/AdicCompletion/Functoriality.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/Ideal/Colon.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/PowerBasis.lean,Mathlib/RingTheory/QuotSMulTop.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/TensorProduct/Quotient.lean	33	10	['Thmoas-Guan', 'alreadydone', 'erdOne', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	152-60248 4 months ago	152-60248 4 months ago	16-61571 16 days
18202	ADedecker author:ADedecker	chore: refactor algebraic filter bases	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	1086/1315	Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/Barrelled.lean,Mathlib/Analysis/LocallyConvex/WeakDual.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Operator/WeakOperatorTopology.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/Module/UniformConvergence.lean,Mathlib/Topology/Algebra/Nonarchimedean/AdicTopology.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/UniformFilterBasis.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean	14	1	['github-actions']	nobody	152-60180 4 months ago	152-60180 4 months ago	0-0 0 seconds
23546	JovanGerb author:JovanGerb	feat(LinearAlgebra/AffineSpace/AffineSubspace): rename `AffineSubspace.mk'` to `Submodule.shift`	In addition to renaming, I've refactored the code a bit: - `mem_mk'_iff_vsub_mem` was obsolete since it was the same as `mem_mk'`, so I removed it (this is due to a change in the definition I made recently) - I added a nonempty instance for `shift` - I added a simp lemma that `shift` isn't equal to `⊥` (the empty affine subspace). I need this for the next point. - Edit: I'll leave this for a later PR. ~I proved a simp lemma that a `shift` is parallel to a `shift` if and only if the linear subspaces are the same.~ - I renamed `mk'_eq` to `shift_direction_eq_self `. - I renamed `eq_or_eq_secondInter_of_mem_mk'_span_singleton_iff_mem` to `eq_or_eq_secondInter_iff_mem_of_mem_shift_span_singleton`. I think it is better to put the `of_mem_mk'_span_singleton` at the end of the name. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry merge-conflict	128/99	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Geometry/Euclidean/Basic.lean,Mathlib/Geometry/Euclidean/MongePoint.lean,Mathlib/Geometry/Euclidean/PerpBisector.lean,Mathlib/Geometry/Euclidean/Sphere/SecondInter.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean	7	4	['JovanGerb', 'github-actions', 'leanprover-community-bot-assistant']	nobody	152-42680 4 months ago	152-42681 4 months ago	26-25420 26 days
19315	quangvdao author:quangvdao	feat(Data/Finsupp/Fin): Add `Finsupp` operations on `Fin` tuple	This PR adds more analogues of operations on `Fin` tuples to the `Finsupp` setting. Before, there were only `Finsupp.cons` and `Finsupp.tail`. Now there are also `Finsupp.snoc`, `Finsupp.insertNth`, `Finsupp.init`, and `Finsupp.removeNth`. These all come with supporting lemmas. I also removed the porting comment about `succAboveCases` in `Data/Fin/Basic`, and added a lemma about `succAbove` in `Data/Fin/Tuple/Basic`. --- - [x] depends on: #20361 - [x] depends on: #20771 - [x] depends on: #20770 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict awaiting-author	193/16	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Data/Finsupp/Fin.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,scripts/nolints_prime_decls.txt	6	44	['YaelDillies', 'github-actions', 'j-loreaux', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'quangvdao']	nobody	150-16939 4 months ago	150-16939 4 months ago	43-81255 43 days
19464	adomani author:adomani	test: removed merge-conflict	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict delegated WIP	22/1	.github/workflows/PR_summary.yml,scripts/zulip_emoji_merge_delegate.py	2	10	['adomani', 'github-actions', 'leanprover-community-bot-assistant']	nobody	149-28263 4 months ago	149-28265 4 months ago	0-0 0 seconds
7907	urkud author:urkud	feat: introduce `NthRoot` notation class	Also use it for `Real.sqrt`, and replace the few occurrences of `sqrt` that do not already use the notation. --- [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/.60Sqrt.60.20notation.20typeclass/near/400086502) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis awaiting-CI merge-conflict label:t-algebra$	193/156	Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1960Q2.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Mathlib.lean,Mathlib/Algebra/NthRoot.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Asymptotics.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Data/Real/GoldenRatio.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/ConvexBody.lean,Mathlib/NumberTheory/NumberField/ClassNumber.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/Probability/Distributions/Gaussian.lean,MathlibTest/positivity.lean	28	9	['eric-wieser', 'github-actions', 'kmill', 'urkud']	nobody	148-44053 4 months ago	402-57611 1 year ago	0-0 0 seconds
9273	grunweg author:grunweg	feat: extended charts are local diffeomorphisms on their source	--- TODO: I think this should hold at any interior point - as the inverse of the extended chart, restricted to the interior of its source, will be a local inverse. The analogous result for un-extended charts is shown in #8160. Unresolved questions - are all the tiny API lemmas useful; are any more missing? - do I want similar results for `extChartAt`? (In any case, they are easy to deduce.) - [ ] depends on: #8738 for simplicity [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict	225/12	Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Topology/Algebra/Module/Basic.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	148-18088 4 months ago	unknown	unknown
24642	grunweg author:grunweg	WIP-feat: add layercake formula for ENNReal-valued functions	Not much to see here yet; some significant amount of work remains. --- - [ ] depends on: #24643 - [ ] depends on: #24640 (based on that PR for simplicity) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson t-analysis merge-conflict WIP	189/24	Mathlib/Analysis/SpecialFunctions/Pow/Integral.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Integral/Layercake.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	144-36938 4 months ago	144-36941 4 months ago	0-0 0 seconds
21712	grunweg author:grunweg	chore: generalise more lemmas to `ContinuousENorm`	--- - [x] depends on: #21781 (minor drive-by clean-up) - [x] depends on: #21670 - [x] depends on: #22708 (extracted from this) - some parts depend on #21433 (or better: #22175); when the dependent PR has landed, I will re-assess whether to split these into a separate PR [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson t-measure-probability awaiting-CI merge-conflict	76/31	Mathlib/Analysis/Normed/MulAction.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/ContinuousFunctions.lean	4	5	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	143-58622 4 months ago	153-68656 5 months ago	0-0 0 seconds
21375	grunweg author:grunweg	WIP: generalise lemmas to ENorm	This work is part of (and a necessary pre-requisite for) the Carleson project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson t-measure-probability awaiting-CI merge-conflict WIP	471/221	Mathlib/Analysis/NormedSpace/IndicatorFunction.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/ChebyshevMarkov.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Trim.lean,Mathlib/MeasureTheory/Function/LpSpace.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/Probability/Independence/Integrable.lean	13	2	['fpvandoorn', 'grunweg']	nobody	143-52997 4 months ago	153-68651 5 months ago	0-0 0 seconds
24378	urkud author:urkud	feat(Algebra/Order/Field/Basic): generalize lemmas	... from linear ordered semifields to (commutative) groups with zero. --- I'm going to do another round of generalizing today or tomorrow, so making it a draft PR for now. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	183/181	Archive/OxfordInvariants/Summer2021/Week3P1.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/CStarAlgebra/ApproximateUnit.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/BumpFunction/InnerProduct.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Convex/SpecificFunctions/Basic.lean,Mathlib/Analysis/Convex/SpecificFunctions/Pow.lean,Mathlib/Analysis/Convex/StrictConvexSpace.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/Convex/Visible.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Normed/Field/Lemmas.lean,Mathlib/Analysis/Normed/Field/Ultra.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/Analysis/NormedSpace/HomeomorphBall.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean,Mathlib/Analysis/NormedSpace/Pointwise.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSqIntegral.lean,Mathlib/Analysis/SpecialFunctions/SmoothTransition.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Combinatorics/Schnirelmann.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Data/Nat/Cast/Order/Field.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Real/Cardinality.lean,Mathlib/Data/Real/Pi/Wallis.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/RightAngle.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/PeakFunction.lean,Mathlib/MeasureTheory/Measure/SeparableMeasure.lean,Mathlib/NumberTheory/Bertrand.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleAbs.lean,Mathlib/NumberTheory/DiophantineApproximation/Basic.lean,Mathlib/NumberTheory/LSeries/Injectivity.lean,Mathlib/NumberTheory/LSeries/ZMod.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/MahlerBasis.lean,Mathlib/NumberTheory/Pell.lean,Mathlib/NumberTheory/Transcendental/Liouville/LiouvilleNumber.lean,Mathlib/Order/Filter/AtTopBot/Floor.lean,Mathlib/Order/Interval/Set/IsoIoo.lean,Mathlib/Probability/StrongLaw.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/Topology/ContinuousMap/Polynomial.lean,Mathlib/Topology/Instances/AddCircle.lean,Mathlib/Topology/UrysohnsLemma.lean	72	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	143-37327 4 months ago	143-37329 4 months ago	0-0 0 seconds
13685	niklasmohrin author:niklasmohrin	feat(Combinatorics): add definitions for network flows	Although we might not have any super-interesting results ready for mathlib yet, I feel that the definitions from this commit are already mature enough to include. These definitions are ported from last semester's work we did at https://github.com/niklasmohrin/lean-seminar-2023 and I have put some time in to refactor our code to `Int` and now to any parameter `R`. In the linked repository, there is some more stuff that I can send in. One obstacle without integer values is that it is not clear why a maximum flow would exist. I think the best way to tackle this would be to prove max-flow-min-cut theorem and implement the Ford-Fulkerson algorithm. It has been pointed out on Zulip that there is an [Isabelle formalization of the Edmonds Karp Algorithm](https://www.isa-afp.org/entries/EdmondsKarp_Maxflow.html). I feel that the definitions are pretty solid and it makes sense to include them, even if just for unifying definitions across downstream projects. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics merge-conflict awaiting-author	244/0	Mathlib.lean,Mathlib/Combinatorics/Flow/Basic.lean,docs/references.bib	3	57	['Shreyas4991', 'YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak', 'niklasmohrin']	nobody	142-7176 4 months ago	142-7178 4 months ago	86-21072 86 days
15115	kkytola author:kkytola	feat: Generalize assumptions in liminf and limsup results in ENNReals	In a [review comment](https://github.com/leanprover-community/mathlib4/pull/13938#discussion_r1649744441) it was pointed out that results about liminf and limsup in ENNReal hold under milder assumptions. This PR does the generalization. --- This PR is split off from #13938, where the review comment was made. The changes needed for the suggested generalization were of different kind than the simple PR's content, justifying a separate PR. - [x] depends on: #13938 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-topology merge-conflict awaiting-author help-wanted	215/27	Mathlib/MeasureTheory/Measure/Portmanteau.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Topology/Instances/ENNReal.lean	3	8	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'j-loreaux', 'kkytola', 'leanprover-community-mathlib4-bot']	nobody	141-49332 4 months ago	166-33636 5 months ago	21-25493 21 days
17129	joneugster author:joneugster	feat(Tactic/Linter): add unicode linter for unicode variant-selectors	Unicode characters can be followed by one of the two "variant-selectors" `\FE0E` (text) or `\FE0F` (emoji). These appear to the user as a single unicode character and they might copy them by accident. For example `✅️` (`\u2705\uFE0F`), `✅` (`\u2705`) and `✅︎` (`\u2705\uFE0E`) are three variants of the "same" unicode character. The one without variant-selector might display as either emoji or not, depending on the user's device and font. Add unicode linter ensuring variant-selector only appear on specified characters and also ensuring these characters always have the correct variant selector to avoid confusions. Everything flagged by this linter can be fixed fully automatically with `lake exe lint-style --fix` or by commenting `bot fix style` on the PR. --- - tracking PR: #16215 ## Zulip discussions: - https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F - https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Lean.20specific.20font ## Related PRs: - leanprover/lean4#5015 added some emoji-variant selectors to Emojis used in `Lean` itself. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict delegated awaiting-author	245/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnicodeLinter.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CongrM.lean,Mathlib/Tactic/Widget/Conv.lean,Mathlib/Tactic/Widget/GCongr.lean,Mathlib/Topology/ContinuousMap/Weierstrass.lean,MathlibTest/LintStyleTextBased.lean	11	25	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant']	nobody	140-37838 4 months ago	140-37840 4 months ago	82-54712 82 days
17131	joneugster author:joneugster	feat(Tactic/Linter): add unicode linter for unwanted characters	Add unicode linter flagging bad unicode characters. In this first form, the linter only flags `\u00A0` (non-breaking space) and replaces it with a normal space. Non-breaking space has been chosen because they keep reappearing in mathlib and it seems to be uncontroversial to lint for these. The whitelist/blacklist could then be refined in future PRs. Everything flagged by this linter can be fixed fully automatically with `lake exe lint-style --fix` or by commenting `bot fix style` on the PR. --- - tracking PR: #16215 ## Zulip discussions: - https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F - https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Lean.20specific.20font [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict awaiting-author	112/8	Mathlib.lean,Mathlib/Algebra/Lie/Semisimple/Lemmas.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/CategoryTheory/Category/ReflQuiv.lean,Mathlib/LinearAlgebra/Vandermonde.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnicodeLinter.lean	8	6	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	adomani and grunweg assignee:grunweg assignee:adomani	140-37837 4 months ago	140-37839 4 months ago	52-18594 52 days
8495	jjaassoonn author:jjaassoonn	feat : Tensor-Hom adjunction in the category of modules	# Tensor-Hom adjunction Let $R$ be a commutative ring and $S$ any ring. Let $X$ be an $(S,R)$-bimoule. Then the tensor functor $(X \otimes_R \cdot)$ is a functor from left $R$-modules to left $S$-modules; and the hom-functor $Hom_S(X, \cdot)$ is a functor from left $S$-modules to left $R$-modules. For another left $S$-module $Y$, the left $R$-module structure of $Hom_S(X, Y)$ is given by $s \cdot f := x \mapsto f(s \cdot x)$. These two functors are adjoint.. In particular we have that ```math {\rm Hom}_{S}(X\otimes_R Y, Z) \cong {\rm Hom}_R (Y, {\rm Hom}_S (X, Z)) ``` ## Implementation notes 1. Why not use the `Mathlib/LinearAlgebra/TensorProduct/Tower.lean` In our setting `X` is an `(R, S)` bimodule and `Y` an `R`-module and `Z` an `S`-module so to use the `Tower` file, we need `S` to be an `R`-algebra which is a luxury we do not have. But note that in `Tower` file, `curry` and `uncurry` are both tri-linear maps. So `Tower` file allows interplay of 3 rings which is not allowed in this file. 2. We require `R` to be commutative but we never used anything commutative. This is because of tensor product requires commutativity, but thanks to @alreadydone, this assumption could be removed soon. I think this PR should wait for Junyan's attempt on removing commutativity, so it is marked as draft and wip for now --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author WIP label:t-algebra$	214/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/TensorHomAdjunction.lean	2	88	['alreadydone', 'bustercopley', 'eric-wieser', 'github-actions', 'jjaassoonn', 'kbuzzard', 'kim-em', 'leanprover-community-bot-assistant']	eric-wieser assignee:eric-wieser	139-43868 4 months ago	139-43869 4 months ago	0-0 0 seconds
19284	adomani author:adomani	test: commit a change only to the "master" CI build action	This PR should fail CI, since the main CI build file is incompatible with the autogenerated ones. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict awaiting-author	3/3	.github/build.in.yml,.github/workflows/actionlint.yml	2	12	['adomani', 'bryangingechen', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant']	bryangingechen assignee:bryangingechen	137-75272 4 months ago	137-75273 4 months ago	0-0 0 seconds
15651	TpmKranz author:TpmKranz	feat(Computability/NFA): operations for Thompson's construction	Lays the groundwork for a proof of equivalence of RE and NFA, w.r.t. described language. Actual connection to REs comes later, after the groundwork for the opposite direction has been laid. Third chunk of #12648 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	307/5	Mathlib/Computability/NFA.lean	1	15	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte']	nobody	137-37584 4 months ago	137-37585 4 months ago	45-84611 45 days
22361	rudynicolop author:rudynicolop	feat(Computability/NFA): nfa closure properties	Add the closure properties union, intersection and reversal for NFA. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	218/2	Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean	2	90	['EtienneC30', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	EtienneC30 assignee:EtienneC30	137-36658 4 months ago	137-36660 4 months ago	39-67601 39 days
15254	yuma-mizuno author:yuma-mizuno	feat(CategoryTheory/Monoidal): replace `Mon_` lemmas with `Mon_Class` lemmas	We redefine algebras internal to monoidal categories, which were defined by full-bundled structures, in terms of semi-bundled type classes. The original full-bundled structure `X` is renamed to `X_Cat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	3982/96	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Bimod_Class.lean,Mathlib/CategoryTheory/Monoidal/Bimon_.lean,Mathlib/CategoryTheory/Monoidal/Bimon_Class copy.lean,Mathlib/CategoryTheory/Monoidal/Bimon_Class.lean,Mathlib/CategoryTheory/Monoidal/Braided/Opposite.lean,Mathlib/CategoryTheory/Monoidal/CommMon_Class.lean,Mathlib/CategoryTheory/Monoidal/Comon_.lean,Mathlib/CategoryTheory/Monoidal/Comon_Class.lean,Mathlib/CategoryTheory/Monoidal/Internal/ModuleClass.lean,Mathlib/CategoryTheory/Monoidal/Mod_Class.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Mon_Class.lean,Mathlib/CategoryTheory/Monoidal/mwe.lean	14	n/a	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'yuma-mizuno']	nobody	134-14443 4 months ago	unknown	unknown
22837	joneugster author:joneugster	feat(Data/Set/Basic): add subset_iff and not_mem_subset_iff	Add `Set.subset_iff` for consistent API with `Finset.subset_iff`. Add `Set.not_mem_subset_iff` and `Finset.not_mem_subset_iff`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-data merge-conflict	9/0	Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Set/Basic.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant']	nobody	131-45680 4 months ago	131-45682 4 months ago	30-35190 30 days
23489	plp127 author:plp127	chore: fix recursors	Replace motive with `motive` and other improvements. Will probably split this PR after fixing is done. 4013 recursors left --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	4255/172	Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Lie/BaseChange.lean,Mathlib/Algebra/Lie/IdealOperations.lean,Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/SubboxInduction.lean,Mathlib/CategoryTheory/Quotient.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/BubbleSortInduction.lean,Mathlib/Data/Fin/Tuple/NatAntidiagonal.lean,Mathlib/Data/FinEnum/Option.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/Fintype/CardEmbedding.lean,Mathlib/Data/Fintype/Option.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Nat/BinaryRec.lean,Mathlib/Data/PFun.lean,Mathlib/Data/PFunctor/Multivariate/W.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Coprod/Basic.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaEven.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaOdd.lean,Mathlib/Order/DirectedInverseSystem.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/SetTheory/Cardinal/Defs.lean,Mathlib/SetTheory/PGame/Algebra.lean,done.csv,print.lean,working.csv	42	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	131-45161 4 months ago	131-45162 4 months ago	0-0 0 seconds
24100	eric-wieser author:eric-wieser	feat: restore some explicit binders from Lean 3	Part of #24099 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt merge-conflict awaiting-author	39/42	Mathlib/Data/FinEnum.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Compactness/CompactlyGeneratedSpace.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/Metrizable/CompletelyMetrizable.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	10	3	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	131-45036 4 months ago	131-45038 4 months ago	34-33204 34 days
21476	grunweg author:grunweg	feat(lint-style): enable running on downstream projects	Enable lint-style to run on downstream projects, by making the following modifications: - allow passing an explicit list of libraries to lint: if nothing is passed, it lints `Mathlib`, `Archive` and `Counterexamples` (as before); otherwise, it lints precisely the passed modules - only check init imports, undocumented scripts and the errors from `lint-style.py` when linting Mathlib - make the style exceptions file configurable and optional: using the `nolints-file` flag, the exceptions file can be configured. If the flag is omitted, we try to find a file at `scripts/nolints-style.txt` --- and otherwise proceed with no style exceptions. This means mathlib can continue unchanged, and downstream projects can either add an explicit exceptions file, or proceed without any exceptions. After this PR, one should be able to run lint-style on a downstream project by `lake exe lint-style ProjectName`. Prompted by [this zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/lint-style.20for.20downstream.20libraries). --- - [ ] depends on: #24570 - [ ] depends on: #24953 (I did not test the last part.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	58/19	Mathlib/Tactic/Linter/TextBased.lean,scripts/lint-style.lean	2	19	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	joneugster assignee:joneugster	130-51168 4 months ago	130-51171 4 months ago	43-17409 43 days
24163	urkud author:urkud	refactor(TangentCone): redefine for TVS	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	421/284	Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Topology/Algebra/ConstMulAction.lean	3	4	['github-actions', 'leanprover-community-bot-assistant']	nobody	129-82885 4 months ago	129-82886 4 months ago	0-0 0 seconds
23349	BGuillemet author:BGuillemet	feat: add LocallyLipschitzOn.lipschitzOnWith_of_isCompact and two small lemmas about Lipschitz functions	Main feat (in Mathlib/Topology/EMetricSpace/Basic.lean): if a function `f` from an extended pseudometric space to a pseudometric space is locally Lipschitz on a compact subset `s`, then `f` is Lipschitz on `s`. The theorem is true only when the codomain of `f` is a pseudometric space, so it needs imports from Mathlib/Topology/MetricSpace. Other small feat (in Mathlib/Analysis/Calculus/ContDiff/RCLike.lean): a function that is continuously differentiable on an open subset is locally Lipschitz on this subset. --- - [ ] depends on: #22890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-topology merge-conflict	59/4	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	PatrickMassot assignee:PatrickMassot	129-32898 4 months ago	129-32900 4 months ago	35-30364 35 days
23767	grunweg author:grunweg	refactor: make library notes a definition	Make library notes a definition of `Unit` type, whose doc-string is the note's content. As a consequence, - doc-gen will display all library notes without any custom logic, - library notes are shown upon hover (via the use of the doc-string), - go do definition for library notes is easy Automate this using a macro, which also enforces that all library notes are inside the Mathlib.LibraryNote namespace. Temporarily, we use the `library_note2` name; if/when the batteries version is changed, we can reclaim the original name. This PR does not address how to refer to library notes nicely (in a way that is shown in the documentation, checked for typos, with sufficient imports ensured etc.). That is left to a future PR. This is proposal 2a from this [zulip discussion]([#mathlib4 > library notes @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/library.20notes/near/510614740)) ------------ Open questions/TODOs: - should this go in batteries instead? can the old definition just be overwritten? - otherwise, what's the best place for the `LibraryNote` definition? A single file just for this feels overkill; I put it in Mathlib.Tactic.Basic for now. I could use Mathlib.Init, of course (but that might be excessive) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta merge-conflict	48/48	Archive/Imo/Imo2019Q2.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Scalar.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Note.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Logic/Basic.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/NormNum/Basic.lean,Mathlib/Tactic/Simps/Basic.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Continuous.lean	26	9	['adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	127-45993 4 months ago	127-45995 4 months ago	51-69759 51 days
12438	jjaassoonn author:jjaassoonn	feat: some APIs for flat modules	Need horseshoe lemma --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	1674/3	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Exact.lean,Mathlib/CategoryTheory/Abelian/Basic.lean,Mathlib/CategoryTheory/Abelian/DiagramLemmas/Horseshoe.lean,Mathlib/CategoryTheory/Abelian/LeftDerived.lean,Mathlib/RingTheory/Flat/Basic.lean	8	21	['erdOne', 'github-actions', 'jjaassoonn', 'joelriou']	nobody	124-45524 4 months ago	510-62941 1 year ago	0-0 0 seconds
24965	erdOne author:erdOne	refactor: Make `IsLocalHom` take unbundled map	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-algebra merge-conflict awaiting-author label:t-algebra$	16/7	Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace/HasColimits.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean	5	6	['alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	122-86279 4 months ago	122-86280 4 months ago	10-26015 10 days
8740	digama0 author:digama0	fix: improve `recall` impl / error reporting	Simplifies the implementation of `recall`, fixing a bug [reported on Zulip](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/.60recall.60.20strangeness/near/405076713) and also eliminating a use of `open private`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI t-meta merge-conflict awaiting-author	27/39	Mathlib/Tactic/Recall.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	122-62785 4 months ago	122-62787 4 months ago	0-0 0 seconds
21182	joneugster author:joneugster	fix(Util/CountHeartbeats): move elaboration in #count_heartbeats inside a namespace	Currently the `#count_heartbeat` linter reported the heartbeats until it concluded `error: [declaration] has already been declared` instead of re-elaborating the declaration. --- [Zulip report](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/count_heartbeats.20for.20all.20declarations.20in.20a.20file.3F/near/496303652) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	72/5	Mathlib/Util/CountHeartbeats.lean,MathlibTest/CountHeartbeats.lean	2	17	['adomani', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib-bors']	adomani assignee:adomani	122-61646 4 months ago	122-61647 4 months ago	64-19141 64 days
17715	adomani author:adomani	feat: the unusedVariableCommand linter	This is still work-in-progress, but also help-wanted! The linter reliably flags unused variables: so far, only `example`s fool it (and that is simply because I did not implement a fix, as there are very few `variable`s that are only used in `example`s in mathlib). The work-in-progress part refers to the fact that the linter uses an `IO.Ref` to keep track of variables and this does not work well with editing the file. The linter works on a fresh parse of a file, but becomes out-of-sync with every edit. The help-wanted is to ask for help to make mathlib compliant with the linter, by checking out this branch and PR-ing a few variable removals! [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Unused.20variables) --- Known issues: * automatic namespacing and `nonrec` may cause difficulty when the newly introduced declaration is preferred in the term, rather than the original one (see examples here ```bash code -r -g ././././Mathlib/Analysis/SpecialFunctions/Arsinh.lean:183 code -r -g ././././Mathlib/Probability/Independence/Basic.lean:368 ``` where, for instance, `ContinuousOn.arsinh` is used internally instead of `Real.arsinh`). * `mutual` declarations confuse the linter ```bash code -r -g ././././Mathlib/SetTheory/Lists.lean:313 ``` * `code -r -g Mathlib/CategoryTheory/EffectiveEpi/Comp.lean:133:29` * universe annotations confuse the linter: ```bash code -r -g ././././Mathlib/Topology/Category/CompactlyGenerated.lean:53 code -r -g ././././Mathlib/AlgebraicTopology/CechNerve.lean:46 ``` * `inductive`s confusing the linter ```bash code -r -g ././././Mathlib/Deprecated/Subgroup.lean:389 code -r -g ././././Mathlib/FieldTheory/PerfectClosure.lean:55 ``` * `def`s confusing the linter ```bash code -r -g ././././Mathlib/Data/MLList/BestFirst.lean:104 ``` * special typeclass assumptions ```code code -r -g ././././Mathlib/RingTheory/WittVector/Truncated.lean:273 code -r -g ././././Mathlib/Topology/Category/Profinite/Product.lean:79 ``` * not sure what is going on here: ```bash code -r -g ././././Mathlib/RingTheory/WittVector/IsPoly.lean:95 code -r -g ././././Mathlib/Probability/Independence/Basic.lean:368 code -r -g ././././Mathlib/Analysis/Calculus/FDeriv/Star.lean:30 ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict	695/22	Mathlib.lean,Mathlib/Algebra/Group/Idempotent.lean,Mathlib/Algebra/GroupWithZero/Idempotent.lean,Mathlib/Data/Finite/Defs.lean,Mathlib/Data/Int/Cast/Field.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Init.lean,Mathlib/MeasureTheory/Function/LpSpace/DomAct/Continuous.lean,Mathlib/NumberTheory/LSeries/PrimesInAP.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/BoundedOrder/Lattice.lean,Mathlib/Order/BoundedOrder/Monotone.lean,Mathlib/Order/Monotone/Monovary.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/UnusedVariableCommand.lean,MathlibTest/UnusedVariableCommand.lean,lakefile.lean	17	n/a	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	122-40282 4 months ago	unknown	unknown
23371	grunweg author:grunweg	chore: mark `Disjoint.{eq_bot, inter_eq}` simp	And add the analogous lemma to `Finset`. Spun out from #22964, hence transitively part of my bordism theory project. Some lemmas there are more conveniently stated with `Disjoint`, which requires tagging at least `inter_eq` with simp. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict awaiting-author	12/11	Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finset/Lattice/Lemmas.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Disjoint.lean,Mathlib/Order/Disjoint.lean,Mathlib/Topology/Compactification/OnePoint.lean,Mathlib/Topology/Order/OrderClosed.lean	7	31	['YaelDillies', 'eric-wieser', 'github-actions', 'grunweg', 'j-loreaux', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	nobody	121-46007 3 months ago	121-46010 3 months ago	32-65400 32 days
16020	adomani author:adomani	feat: compare PR `olean`s size with `master`	Adds two CI steps: * `print the sizes of the oleans` that prints the sizes of all the folders containing `Mathlib` `.olean`s; * `compare oleans` that compares the sizes of the previous step with the corresponding sizes on `master`. In the test runs, the two steps have taken at most 3 seconds combined (the first is virtually instantaneous, the second one depends on `curl` to find a job id and on `gh` to retrieve the logs of a previous CI run -- everything else appears to be negligible). This hopefully helps finding out if some PR is bloating up the `.olean`s. See [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Error.3A.20No.20space.20left.20on.20device/near/463792355) for a PR of mine that prompted this check. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict	120/0	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,scripts/olean_comparison.sh	5	50	['Vtec234', 'YaelDillies', 'adomani', 'bryangingechen', 'github-actions', 'grunweg', 'kim-em', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	119-82905 3 months ago	119-82907 3 months ago	285-26861 285 days
16062	adomani author:adomani	Test/ci olean size	Tests for oleans --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict awaiting-author WIP	114/0	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,scripts/olean_comparison.sh	5	4	['Parcly-Taxel', 'adomani', 'github-actions', 'leanprover-community-bot-assistant']	nobody	119-82905 3 months ago	119-82906 3 months ago	0-16 16 seconds
25507	eric-wieser author:eric-wieser	chore(RingTheory/Valuation): golf using `Con`	This has no particular motivation besides seeing if `Con` is a performant substitute. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	bench-after-CI t-algebra merge-conflict label:t-algebra$	20/35	Mathlib/RingTheory/Valuation/ValuationRing.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	119-74384 3 months ago	119-74385 3 months ago	0-0 0 seconds
12799	jstoobysmith author:jstoobysmith	feat(LinearAlgebra/UnitaryGroup): Add properties of Special Unitary Group	Add properties of the special unitary group, mirroring the properties of found in Algebra/Star/Unitary.lean. In particular, I add an instance of `specialUnitaryGroup` as a `Group`, `Star`, `InvolutiveStar`, and `StarMul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict please-adopt awaiting-author label:t-algebra$	78/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	8	['chrisflav', 'jcommelin', 'leanprover-community-bot-assistant']	nobody	119-4851 3 months ago	119-4853 3 months ago	9-22007 9 days
23709	plp127 author:plp127	feat: `Nat.findFrom`	This PR adds `Nat.findFrom`, which is like `Nat.find`, but starting from an arbitrary `k` instead of `0`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	190/47	Mathlib/Data/Nat/Find.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	118-56540 3 months ago	118-56542 3 months ago	62-25661 62 days
25340	dupuisf author:dupuisf	chore(Analysis/Convex): move files pertaining to convex/concave functions to their own folder	This PR creates a new folder under `Analysis/Convex` called `Analysis/Convex/Function`, which includes files that are mostly or entirely about convex/concave functions (as opposed to convex sets). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry merge-conflict	4264/4155	Mathlib.lean,Mathlib/Analysis/Convex/Continuous.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convex/Extrema.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Function/Basic.lean,Mathlib/Analysis/Convex/Function/Continuous.lean,Mathlib/Analysis/Convex/Function/Deriv.lean,Mathlib/Analysis/Convex/Function/Extrema.lean,Mathlib/Analysis/Convex/Function/Integral.lean,Mathlib/Analysis/Convex/Function/Jensen.lean,Mathlib/Analysis/Convex/Function/Mul.lean,Mathlib/Analysis/Convex/Function/Piecewise.lean,Mathlib/Analysis/Convex/Function/Quasiconvex.lean,Mathlib/Analysis/Convex/Function/Slope.lean,Mathlib/Analysis/Convex/Function/Strong.lean,Mathlib/Analysis/Convex/Integral.lean,Mathlib/Analysis/Convex/Jensen.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/Piecewise.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Convex/SpecificFunctions/Basic.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/Convex/Strong.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Log/NegMulLog.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/MeasureTheory/Measure/Decomposition/IntegralRNDeriv.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean	34	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	118-55725 3 months ago	118-55727 3 months ago	6-40169 6 days
13994	grunweg author:grunweg	chore(Topology): replace continuity -> fun_prop	Addresses a few porting notes; I expect also a substantial speed-up of some proofs. Change a few default values of proof fields from `continuity` to `fun_prop`; this required a few fix-ups downstream. (I checked a few instances; the failure seems related to `Continuous.subtype_mk` not always firing.) This is almost (but not fully) exhaustive. ---------- One proof gets partially un-automated (cont. -> partial fun_prop); if desired, I can revert this change. - [x] depends on: #11092 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	105/20	Mathlib/Analysis/Distribution/FourierSchwartz.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Dynamics/Flow.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/Topology/Algebra/Field.lean,Mathlib/Topology/Algebra/Monoid.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean,Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean,Mathlib/Topology/ContinuousMap/Basic.lean,Mathlib/Topology/ContinuousMap/Bounded/Basic.lean,Mathlib/Topology/ContinuousMap/Compact.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean,Mathlib/Topology/ExtremallyDisconnected.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Instances/RealVectorSpace.lean,Mathlib/Topology/MetricSpace/Perfect.lean,Mathlib/Topology/UnitInterval.lean	18	12	['MichaelStollBayreuth', 'github-actions', 'grunweg', 'j-loreaux', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	117-74398 3 months ago	393-7629 1 year ago	28-21477 28 days
21734	adomani author:adomani	fix(PR summary): checkout GITHUB_SHA	This should make the version of the script that is used on PRs more stable. Suggested by Eric Wieser on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/messageFile.2Emd/near/498941855). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict awaiting-author WIP	2/1	.github/workflows/PR_summary.yml	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	117-72392 3 months ago	117-72394 3 months ago	0-6023 1 hour
13483	adomani author:adomani	feat: automatically replace deprecations	This PR introduces `lake exe update_deprecations` that uses the cache to automatically replace deprecated declarations with the corresponding un-deprecated one. The script handles namespacing, replacing a possibly non-fully-qualified, deprecated name with the fully-qualified non-deprecated name. It is also possible to use ```bash lake exe update_deprecations --mods One.Two.Three,Dd.Ee.Ff ``` to limit the scope of the replacements to the modules `One.Two.Three` and `Dd.Ee.Ff`. This is intended to be a first step in automating updates: combining this with a linter that emits appropriate warnings, the functionality of `lake exe update_deprecations` can be extended to perform more complicated updates. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict delegated awaiting-author	306/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/UpdateDeprecations.lean,MathlibTest/UpdateDeprecations.lean,lakefile.lean,scripts/README.md,scripts/update_deprecations.lean	7	16	['YaelDillies', 'adomani', 'github-actions', 'j-loreaux', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib-bors', 'sgouezel']	joneugster assignee:joneugster	115-4727 3 months ago	115-4728 3 months ago	34-82472 34 days
8949	sebzim4500 author:sebzim4500	Add `by_approx` tactic for proving real inequalities using rational approximation	feat: Add `by_approx` tactic for proving real inequalities by finding rational approximations --- ```lean example : \|sqrt 2 - 1.414\| < 0.001 := by by_approx ``` This is a work in progress, the code is messy and the tactic is often very slow. It also depends on some other PRs that haven't been merged yet. It currently supports basic operations (`+`, `-`, `*`, `/`, `abs`) and has approximation extensions for `sqrt` and `exp`. - [ ] depends on: #8167 - [x] depends on: #8832 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict modifies-tactic-syntax	1670/3	Mathlib.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ByApprox.lean,Mathlib/Tactic/ByApprox/Basic.lean,Mathlib/Tactic/ByApprox/Core.lean,Mathlib/Tactic/ByApprox/Exp.lean,Mathlib/Tactic/ByApprox/Lemmas.lean,Mathlib/Tactic/ByApprox/Test.lean,Mathlib/Tactic/ByApprox/Util.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GRW.lean,Mathlib/Tactic/GRW/Core.lean,Mathlib/Tactic/GRW/Lemmas.lean,Mathlib/Tactic/NormNum/NatFactorial.lean,test/ByApprox.lean,test/GRW.lean,test/norm_num_ext.lean	18	1	['mathlib4-dependent-issues-bot']	nobody	114-10039 3 months ago	114-10041 3 months ago	0-0 0 seconds
20334	miguelmarco author:miguelmarco	feat: allow polyrith to use a local Singular/Sage install	Try to call a local install of Singular (either standalone or inside Sage) to find the witness for polyrith before trying to call the online sage cell server. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta merge-conflict awaiting-author	171/48	Mathlib/Tactic/Polyrith.lean,scripts/polyrith_sage.py	2	16	['eric-wieser', 'github-actions', 'hanwenzhu', 'kim-em', 'miguelmarco', 'mkoeppe']	nobody	111-83804 3 months ago	231-61766 7 months ago	27-65384 27 days
23953	b-reinke author:b-reinke	feat(Data/Matroid/Tutte): define the Tutte polynomial of a matroid	This PR defines the Tutte polynomial of a matroid and shows basic properties. - [x] depends on: #23926 - [ ] depends on #24336 - [ ] depends on: #23951 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict WIP	111/0	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Matroid/Tutte/Basic.lean,Mathlib/Data/Set/Image.lean	3	7	['apnelson1', 'b-reinke', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	109-38884 3 months ago	109-38886 3 months ago	0-0 0 seconds
18441	ADedecker author:ADedecker	refactor(AdicTopology): use new API for algebraic filter bases, and factor some code	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	847/159	Mathlib.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/AdicTopology.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	3	['ADedecker', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	106-47466 3 months ago	106-47468 3 months ago	0-679 11 minutes
18439	ADedecker author:ADedecker	refactor: use new algebraic filter bases API in `FiniteAdeleRing`	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	699/21	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	106-47464 3 months ago	106-47466 3 months ago	0-619 10 minutes
18438	ADedecker author:ADedecker	refactor: adapt `KrullTopology` to the new algebraic filter bases API	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	771/168	Mathlib.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	5	['ADedecker', 'AntoineChambert-Loir', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	106-47463 3 months ago	106-47464 3 months ago	0-638 10 minutes
13964	pechersky author:pechersky	feat(Data/DigitExpansion): begin defining variant of reals without rationals	Based on a de Bruijn 1976 paper. This file is just the basic definition of a digit expansion. Will be followed up with further constructions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	518/0	Mathlib.lean,Mathlib/Data/DigitExpansion/Defs.lean,docs/references.bib	3	11	['eric-wieser', 'github-actions', 'kim-em', 'pechersky']	dupuisf assignee:dupuisf	103-29754 3 months ago	341-55970 11 months ago	129-57991 129 days
26581	nomeata author:nomeata	ignore this: Lean pr testing 9124	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1723/1362	Archive/Arithcc.lean,Archive/Examples/Eisenstein.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Archive/Imo/Imo1972Q5.lean,Archive/Imo/Imo1975Q1.lean,Archive/Imo/Imo1987Q1.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo1998Q2.lean,Archive/Imo/Imo2006Q5.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2024Q1.lean,Archive/Imo/Imo2024Q3.lean,Archive/Imo/Imo2024Q5.lean,Archive/MiuLanguage/DecisionNec.lean,Archive/MiuLanguage/DecisionSuf.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/AscendingDescendingSequences.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/Partition.lean,Archive/Wiedijk100Theorems/PerfectNumbers.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Archive/ZagierTwoSquares.lean,Cache/Lean.lean,Counterexamples/AharoniKorman.lean,Counterexamples/CanonicallyOrderedCommSemiringTwoMul.lean,Counterexamples/CliffordAlgebraNotInjective.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Counterexamples/MapFloor.lean,Counterexamples/MonicNonRegular.lean,Counterexamples/Phillips.lean,Counterexamples/Pseudoelement.lean,Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Homology.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Epi.lean,Mathlib/Algebra/Category/Ring/FinitePresentation.lean,Mathlib/Algebra/Category/Ring/Topology.lean,Mathlib/Algebra/CharP/Basic.lean,Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/Colimit/Module.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Equiv/TransferInstance.lean,Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/Group/Action/Basic.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Finset/Scalar.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Lie/CartanExists.lean,Mathlib/Algebra/Lie/LieTheorem.lean,Mathlib/Algebra/Lie/Weights/Chain.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/Presentation/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/NoZeroSMulDivisors/Defs.lean,Mathlib/Algebra/Order/Antidiag/Pi.lean,Mathlib/Algebra/Order/CauSeq/Completion.lean,Mathlib/Algebra/Order/Field/Power.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Polynomial/Degree/CardPowDegree.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Regular/Pi.lean,Mathlib/Algebra/Ring/Basic.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Algebra/Ring/GrindInstances.lean,Mathlib/Algebra/Ring/Int/Defs.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean	567	n/a	[]	nobody	94-45579 3 months ago	unknown	unknown
14752	AntoineChambert-Loir author:AntoineChambert-Loir	fix(Topology/Algebra/Valued): repair definition of Valued	Following a [discussion on Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Question.20about.20.60Valued.2Eis_topological_valuation.60), we modify the definition of the field `is_topological_valuation` of `Valued` insisting that the element $\gamma$ showing up there is in the subgroup generated by the image of the valuation map. Co-authored-by: @faenuccio - [ ] depends on: #25496	t-algebra t-topology merge-conflict WIP label:t-algebra$	1166/301	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean,Mathlib/Topology/UniformSpace/AbstractCompletion.lean,docs/references.bib	12	28	['AntoineChambert-Loir', 'faenuccio', 'github-actions', 'jcommelin', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	92-36723 3 months ago	92-36725 3 months ago	1-33784 1 day
15213	adomani author:adomani	dev: add Mathlib.Tactic.Linter.ForallIntro	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict WIP	608/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/ForallIntro.lean,MathlibTest/ForallIntro.lean	5	5	['adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	90-83951 2 months ago	90-83952 2 months ago	0-0 0 seconds
16074	Rida-Hamadani author:Rida-Hamadani	feat: combinatorial maps and planar graphs	We define combinatorial maps, then we define planar graph using combinatorial maps. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict	243/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Planar.lean,Mathlib/Data/CombinatorialMap.lean	3	28	['Parcly-Taxel', 'Rida-Hamadani', 'github-actions', 'lambda-fairy', 'leanprover-community-bot-assistant']	kmill assignee:kmill	90-81729 2 months ago	90-81730 2 months ago	72-51453 72 days
16801	awainverse author:awainverse	feat(ModelTheory/Equivalence): The quotient type of formulas modulo a theory	Defines `FirstOrder.Language.Theory.Formula`: `T.Formula α` is the quotient of `L.Formula α` by equivalence modulo a theory `T`. Puts a boolean algebra instance on `T.Formula α`, with `≤` corresponding to implication. --- - [x] depends on: #16799 - [x] depends on: #16800 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict awaiting-author	174/60	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Types.lean	3	30	['YaelDillies', 'awainverse', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'metinersin']	YaelDillies assignee:YaelDillies	90-81728 2 months ago	90-81728 2 months ago	29-26213 29 days
17458	urkud author:urkud	refactor(Algebra/Group): make `IsUnit` a typeclass	Also change some lemmas to assume `[IsUnit _]` instead of `[Invertible _]`. Motivated by potential non-defeq diamonds in #14986, see also [Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Invertible.20and.20data) I no longer plan to merge this PR, but I'm going to cherry-pick some changes to a new PR before closing this one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-algebra merge-conflict label:t-algebra$	82/72	Mathlib/Algebra/CharP/Invertible.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Units.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/GroupTheory/Submonoid/Inverses.lean,Mathlib/LinearAlgebra/AffineSpace/AffineEquiv.lean,Mathlib/LinearAlgebra/AffineSpace/Combination.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Contraction.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Inversion.lean,Mathlib/LinearAlgebra/CliffordAlgebra/SpinGroup.lean,Mathlib/LinearAlgebra/Eigenspace/Minpoly.lean,Mathlib/NumberTheory/MulChar/Basic.lean,Mathlib/RingTheory/Localization/NumDen.lean,Mathlib/RingTheory/Polynomial/Content.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/Valuation/Basic.lean	26	12	['MichaelStollBayreuth', 'acmepjz', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'urkud']	nobody	90-81727 2 months ago	90-81727 2 months ago	0-66650 18 hours
17627	hrmacbeth author:hrmacbeth	feat: universal properties of vector bundle constructions	Characterizations for the smoothness of maps into the total spaces of (1) the direct sum of two vector bundles; (2) the pullback of a vector bundle. This gap in the library was exposed by #17358. --- - [x] depends on: #22804 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict delegated	311/9	Mathlib/Data/Bundle.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Pullback.lean,Mathlib/Topology/FiberBundle/Constructions.lean	4	24	['PatrickMassot', 'github-actions', 'grunweg', 'hrmacbeth', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'sgouezel']	grunweg assignee:grunweg	90-81726 2 months ago	90-81726 2 months ago	91-73632 91 days
19444	joelriou author:joelriou	feat(CategoryTheory/Sites): Equivalence of categories of sheaves with a dense subsite that is 1-hypercover dense	The main result is that if `F : C₀ ⥤ C` is a dense subsite (relatively to topologies `J₀` and `J`) and `F.IsOneHypercoverDense J₀ J` (for a certain universe `w`), then if a coefficient category `A` has limits of size `w`, the pushforward functor induces an equivalence `Sheaf J A ≌ Sheaf J₀ A`. We deduce that if `HasSheafify J₀ A`, then `HasSheafify J A` also holds. This was previously known (see `IsDenseSubsite.sheafEquiv` in `Sites.DenseSubsite`) under a somewhat stronger condition about the existence of limits in `A`. --- - [x] depends on: #19517 - [x] depends on: #19519 This is very much a draft. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	937/2	Mathlib.lean,Mathlib/CategoryTheory/Sites/Continuous.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/Basic.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/OneHypercoverDense.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/SheafEquiv.lean,Mathlib/CategoryTheory/Sites/OneHypercover.lean	6	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	90-81603 2 months ago	90-81603 2 months ago	0-0 0 seconds
19796	peakpoint author:peakpoint	feat: L'Hopital's rule from within a convex set	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict	190/19	Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Convex/Topology.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Order/Interval/Set/Basic.lean	5	15	['RemyDegenne', 'github-actions', 'leanprover-community-bot-assistant', 'peakpoint', 'sgouezel']	sgouezel assignee:sgouezel	90-81602 2 months ago	90-81602 2 months ago	80-57750 80 days
22928	javra author:javra	feat(CategoryTheory): infrastructure for inclusion morphisms into products in categories with 0-morphisms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	52/14	Mathlib/CategoryTheory/Limits/Shapes/BinaryBiproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Biproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/ZeroMorphisms.lean	3	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	90-81221 2 months ago	90-81222 2 months ago	112-51866 112 days
22952	eric-wieser author:eric-wieser	refactor: reimplement `RingQuot` in terms of `RingCon.Quotient`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	157/184	Mathlib/Algebra/RingQuot.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Congruence/Defs.lean	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	90-81220 2 months ago	90-81221 2 months ago	0-0 0 seconds
23763	grunweg author:grunweg	feat(Linter.openClassical): also lint for Classical declarations as …	…a local or scoped instance. --- - [ ] depends on: #23750 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	138/33	Mathlib/RingTheory/Perfection.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Topology/MetricSpace/GromovHausdorffRealized.lean,MathlibTest/GeneralizeProofs.lean,MathlibTest/LintStyle.lean	5	6	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	90-81213 2 months ago	90-81213 2 months ago	82-7297 82 days
23637	kirilvino author:kirilvino	feat(Combinatorics/SimpleGraph): every circuit contains a cycle proof	circuit to cycle proof --- This PR uses the bypass definition in a new function for closed walks that removes repeated vertices. Then proves if the closed walk given is a circuit, that the result from this function is a cycle. This is then packaged up similar to the existing ToPath definition, creating a way of transforming a circuit into a cycle. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics merge-conflict awaiting-author	26/0	Mathlib/Combinatorics/SimpleGraph/Path.lean	1	9	['b-mehta', 'github-actions', 'kirilvino', 'leanprover-community-bot-assistant']	nobody	90-81213 2 months ago	90-81214 2 months ago	13-19789 13 days
24350	erdOne author:erdOne	feat(FieldTheory): fg extension over perfect field is separably generated	Co-authored-by: Christian Merten --- - [x] depends on: #24344 - [x] depends on: #24346 - [x] depends on: #24347 - [x] depends on: #24348 - [x] depends on: #24349 - [x] depends on: #25062 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	466/0	Mathlib.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/FieldTheory/SeparableClosure.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/RingTheory/AlgebraicIndependent/Basic.lean,Mathlib/RingTheory/AlgebraicIndependent/TranscendenceBasis.lean	6	30	['alreadydone', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	90-80824 2 months ago	90-80825 2 months ago	21-66961 21 days
24489	mattrobball author:mattrobball	test		merge-conflict	185/152	Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Eval/Degree.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Isometric.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unique.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Complex/Polynomial/Basic.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Choose/Vandermonde.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/FieldTheory/IsAlgClosed/Spectrum.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/KummerPolynomial.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/GroupTheory/SpecificGroups/Dihedral.lean,Mathlib/GroupTheory/Subgroup/Center.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Grading.lean,Mathlib/LinearAlgebra/ExteriorAlgebra/Grading.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/LinearAlgebra/RootSystem/Finite/CanonicalBilinear.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/Tactic/Ring/Basic.lean	38	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	90-80819 2 months ago	90-80820 2 months ago	0-0 0 seconds
24558	mattrobball author:mattrobball	test		merge-conflict	32/30	Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Data/Matroid/Circuit.lean,Mathlib/Data/Matroid/Closure.lean,Mathlib/Data/Matroid/Loop.lean,Mathlib/Data/Set/Insert.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean,Mathlib/Order/Cover.lean	12	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	90-80818 2 months ago	90-80818 2 months ago	0-0 0 seconds
24614	JovanGerb author:JovanGerb	chore: rename field `inf` to `min` in `Lattice`	As suggested by @eric-wieser, this PR renames the `sup` and `inf` fields in `Lattice` to `max` and `min`. This means that we now can extend `Lattice` and `LinearOrder` simultaneously without ending up with duplicate fields. This should be implemented in a future PR for existing classes like `CompleteLinearOrder`. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60sup.60.2F.60inf.60.20or.20.60max.60.2F.60min.60.20for.20set.20interval.20lemmas.3F) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict awaiting-author	179/185	Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Ring/Idempotent.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Tropical/Lattice.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/Convex/SimplicialComplex/Basic.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/NormedSpace/ENormedSpace.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/CategoryTheory/Groupoid/Subgroupoid.lean,Mathlib/CategoryTheory/Sites/Coverage.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/CategoryTheory/Sites/Sieves.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/CategoryTheory/Subpresheaf/Basic.lean,Mathlib/Combinatorics/Digraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Computability/Reduce.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Multiset/UnionInter.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/PEquiv.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Semiquot.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Sum/Lattice.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/Geometry/Convex/Cone/Basic.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/ModelTheory/Substructures.lean,Mathlib/Order/BooleanSubalgebra.lean,Mathlib/Order/Booleanisation.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/Concept.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/Copy.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/FixedPoints.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Hom/Order.lean,Mathlib/Order/Ideal.lean,Mathlib/Order/Interval/Basic.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/Partition/Finpartition.lean,Mathlib/Order/PropInstances.lean,Mathlib/Order/Sublattice.lean,Mathlib/Order/WithBot.lean,Mathlib/Probability/Process/Filtration.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Finiteness/Small.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/TwoSidedIdeal/Lattice.lean,Mathlib/RingTheory/UniqueFactorizationDomain/FactorSet.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/Group/GroupTopology.lean,Mathlib/Topology/Category/TopCat/OpenNhds.lean,Mathlib/Topology/LocallyFinsupp.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/UniformSpace/Basic.lean	82	14	['JovanGerb', 'bryangingechen', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	nobody	90-80817 2 months ago	90-80817 2 months ago	1-85670 1 day
24710	chrisflav author:chrisflav	chore(Data/Set): `tsum` version of `Set.encard_iUnion_of_finite` for non-finite types	As requested here: https://github.com/leanprover-community/mathlib4/pull/23849#discussion_r2081070200 --- - [ ] depends on: #23849 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	163/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Set/Card/Arithmetic.lean,Mathlib/Data/Set/Card/InfiniteArithmetic.lean,Mathlib/Data/Set/Finite/Lattice.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean,Mathlib/Topology/Instances/ENat/Lemmas.lean	7	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	90-80815 2 months ago	90-80815 2 months ago	1-80465 1 day
24823	eric-wieser author:eric-wieser	refactor: add `hom` lemmas for the `MonoidalCategory` structure on `ModuleCat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	148/164	Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Generator.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/Rep.lean	11	21	['101damnations', 'YaelDillies', 'eric-wieser', 'github-actions', 'joelriou', 'kbuzzard', 'leanprover-community-bot-assistant']	101damnations assignee:101damnations	90-80814 2 months ago	90-80814 2 months ago	43-42841 43 days
25071	erdOne author:erdOne	feat(EllipticCurve): basic API for singular cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict	320/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	3	35	['Multramate', 'acmepjz', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant']	nobody	90-80568 2 months ago	90-80569 2 months ago	45-4961 45 days
25197	eric-wieser author:eric-wieser	feat: Finset.sum induction for tensor products.	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict label:t-algebra$	81/0	Mathlib/LinearAlgebra/TensorProduct/Basic.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	90-80566 2 months ago	90-80567 2 months ago	0-0 0 seconds
25218	kckennylau author:kckennylau	feat(AlgebraicGeometry): Tate normal form of elliptic curves	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip new-contributor t-algebraic-geometry merge-conflict	291/26	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Modular/TateNormalForm.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	5	31	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'github-actions', 'grunweg', 'kckennylau', 'leanprover-community-bot-assistant']	nobody	90-80565 2 months ago	90-80566 2 months ago	6-51040 6 days
25247	alreadydone author:alreadydone	Projective contraction	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	160/31	Mathlib/Data/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/RingTheory/Finiteness/Finsupp.lean	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	90-80562 2 months ago	90-80563 2 months ago	0-30 30 seconds
25283	Brian-Nugent author:Brian-Nugent	feat: regular local rings	Adds regular local rings and proves they are integral domains. --- - [ ] depends on: #25280 - [ ] depends on: #25282 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict label:t-algebra$	871/0	.vscode/settings.json,Mathlib.lean,Mathlib/RingTheory/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRingDimension.lean,Mathlib/RingTheory/RegularLocalRing.lean	5	6	['Brian-Nugent', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'yuanyi-350']	nobody	90-80561 2 months ago	90-80561 2 months ago	11-84822 11 days
25561	callesonne author:callesonne	feat(Category/Grpd): define the bicategory of groupoids	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict awaiting-author	179/25	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Category/Grpd.lean	6	6	['callesonne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'robin-carlier']	nobody	90-80550 2 months ago	90-80551 2 months ago	11-11653 11 days
25573	JovanGerb author:JovanGerb	feat: define `∃ x > y, ...` notation to mean `∃ x, y < x ∧ ...`	This PR changes the elaboration of the binders `∃ x > y,` and `∀ x > y,` to use `<` instead of `>`, because we want to avoid working with `>` as much as possible (and similarly for `≥` vs `≤` ). The advantage is that we don't need to worry about rewriting with lemmas like `gt_iff_lt`. The disadvantage is that people might find this confusing. [#mathlib4 > naming convention for ≤ and < @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/naming.20convention.20for.20.E2.89.A4.20and.20.3C/near/522910464) The main changes are in `Mathlib.Init`, `Mathlib.Util.Delaborators` and `MathlibTest.delaborators`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	59/52	Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/BoxIntegral/Integrability.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Liouville.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Dynamics/Ergodic/Conservative.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Init.lean,Mathlib/MeasureTheory/Covering/LiminfLimsup.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Egorov.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Integral/DivergenceTheorem.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/NumberTheory/LSeries/SumCoeff.lean,Mathlib/Order/Filter/AtTopBot/Finite.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/Topology/CWComplex/Classical/Finite.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/EMetricSpace/Paracompact.lean,Mathlib/Topology/LocallyFinite.lean,Mathlib/Topology/MetricSpace/Ultra/Basic.lean,Mathlib/Util/Delaborators.lean,MathlibTest/delaborators.lean	32	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	90-80549 2 months ago	90-80550 2 months ago	26-17604 26 days
25622	eric-wieser author:eric-wieser	refactor: overhaul instances on LocalizedModule	This: * Generalizes the `SMul`, `Module`, and `Algebra` instances via appropriate compatibility conditions * Generalizes the `Mul` instance to the non-unital setting * Fixes instances diamonds for the `Nat`- and `Int`-actions --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	167/111	Mathlib/Algebra/Module/LocalizedModule/Basic.lean	1	4	['erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	90-80423 2 months ago	90-80424 2 months ago	25-53155 25 days
25671	eric-wieser author:eric-wieser	refactor: generalize `OreSet` to work for bimodules	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	243/256	Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/GroupTheory/OreLocalization/OreSet.lean,Mathlib/RingTheory/OreLocalization/Ring.lean,Mathlib/RingTheory/TensorProduct/Nontrivial.lean	6	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	90-80421 2 months ago	90-80422 2 months ago	0-0 0 seconds
25816	sgouezel author:sgouezel	chore: kill coercion from EquivLike to Equiv	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict WIP	35/37	Mathlib/Logic/Equiv/Defs.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	90-80407 2 months ago	90-80407 2 months ago	0-1 1 second
25887	eric-wieser author:eric-wieser	feat: add `IsSMulTorsionFree`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict label:t-algebra$	130/12	Mathlib/Algebra/Group/Action/TorsionFree.lean,Mathlib/Algebra/NoZeroSMulDivisors/Basic.lean,Mathlib/Algebra/Regular/Opposite.lean	3	4	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant']	nobody	90-80273 2 months ago	90-80274 2 months ago	0-0 0 seconds
25901	callesonne author:callesonne	feat(Bicategory/Opposites): add 1-cell opposite bicategory	This PR adds the 1-cell opposite bicategory, where only the 1-morphisms are reversed. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict awaiting-author	219/1	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Opposites.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/Tactic/CategoryTheory/Reassoc.lean	4	10	['callesonne', 'github-actions', 'joelriou', 'leanprover-bot', 'leanprover-community-bot-assistant']	nobody	90-80270 2 months ago	90-80270 2 months ago	0-14913 4 hours
25963	artie2000 author:artie2000	refactor: Abstract out the substructure lattice construction and SetLike closure operators	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Original PR: https://github.com/leanprover-community/mathlib4/pull/20836	merge-conflict	354/179	Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Data/SetLike/Closure.lean	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	90-80258 2 months ago	90-80259 2 months ago	0-0 0 seconds
25988	Multramate author:Multramate	refactor(AlgebraicGeometry/EllipticCurve/*): replace Fin 3 with products	This PR continues the work from #24593. Original PR: https://github.com/leanprover-community/mathlib4/pull/24593	t-algebraic-geometry merge-conflict	1000/1022	Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean	6	3	['Multramate', 'github-actions', 'leanprover-community-bot-assistant']	nobody	90-80256 2 months ago	90-80256 2 months ago	18-21880 18 days
26002	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/Action): action of `Type` on categories with coproducts	We show that if a category admits coproducts of size `w`, then `Type w` acts on the left on that category. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	213/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Action/ChosenTypeCopowers.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	90-80254 2 months ago	90-80255 2 months ago	0-0 0 seconds
26011	linesthatinterlace author:linesthatinterlace	feat: add elementary lifts for `OneHom`, `MulHom`, `MonoidHom` and `RingHom`.	This PR continues the work from #25264. Original PR: https://github.com/leanprover-community/mathlib4/pull/25264	migrated-from-branch t-algebra merge-conflict label:t-algebra$	414/10	Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Ring/Hom/Basic.lean,Mathlib/Algebra/Ring/Hom/Defs.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	90-80252 2 months ago	90-80253 2 months ago	17-68825 17 days
26012	linesthatinterlace author:linesthatinterlace	feat: Low-level derivatives of lifts on `OneHom`, `MulHom` and `MonoidHom`	This PR continues the work from #25290. Original PR: https://github.com/leanprover-community/mathlib4/pull/25290	migrated-from-branch t-algebra merge-conflict label:t-algebra$	785/34	Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Ring/Hom/Basic.lean,Mathlib/Algebra/Ring/Hom/Defs.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	90-80251 2 months ago	90-80252 2 months ago	17-68773 17 days
26090	grunweg author:grunweg	chore: make `finiteness` a default tactic	Opening for discussion. This PR continues the work from #25119.	merge-conflict	423/366	Archive/Wiedijk100Theorems/BallotProblem.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Asymptotics/ExpGrowth.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Convex/Integral.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Analysis/Fourier/AddCircleMulti.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Holder.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENNReal/Real.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/InformationTheory/KullbackLeibler/Basic.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Egorov.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/L1Space/AEEqFun.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/ChebyshevMarkov.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Defs.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Complete.lean,Mathlib/MeasureTheory/Function/LpSpace/Indicator.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/Prod.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean,Mathlib/MeasureTheory/Measure/Decomposition/IntegralRNDeriv.lean,Mathlib/MeasureTheory/Measure/Decomposition/Lebesgue.lean,Mathlib/MeasureTheory/Measure/Haar/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar.lean,Mathlib/MeasureTheory/Measure/Haar/Quotient.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/MeasureTheory/Measure/Real.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/Tilted.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Finite.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/Probability/BorelCantelli.lean,Mathlib/Probability/Independence/Conditional.lean,Mathlib/Probability/Integration.lean,Mathlib/Probability/Kernel/Composition/IntegralCompProd.lean,Mathlib/Probability/Kernel/Disintegration/CondCDF.lean,Mathlib/Probability/Kernel/Disintegration/Density.lean,Mathlib/Probability/Martingale/Convergence.lean,Mathlib/Probability/Martingale/OptionalStopping.lean,Mathlib/Probability/Moments/CovarianceBilin.lean,Mathlib/Probability/Moments/Tilted.lean,Mathlib/Probability/Moments/Variance.lean,Mathlib/Probability/UniformOn.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/Perfect.lean,scripts/noshake.json	73	3	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	90-78266 2 months ago	90-78267 2 months ago	16-56825 16 days
26384	jjdishere author:jjdishere	feat(RingTheory/Perfectoid): Fontaine's theta map is surjective	This PR continues the work from #22332. Original PR: https://github.com/leanprover-community/mathlib4/pull/22332	t-algebra t-number-theory merge-conflict WIP label:t-algebra$	1109/15	Mathlib.lean,Mathlib/Algebra/Ring/Aut.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/PowTransition.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Perfectoid/BDeRham.lean,Mathlib/RingTheory/Perfectoid/FontaineTheta.lean,Mathlib/RingTheory/Perfectoid/Untilt.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/RingTheory/WittVector/Complete.lean,Mathlib/RingTheory/WittVector/TeichmullerSeries.lean,docs/references.bib	15	3	['github-actions', 'jjdishere', 'leanprover-community-bot-assistant']	nobody	90-78120 2 months ago	90-78120 2 months ago	0-135 2 minutes
26388	jjdishere author:jjdishere	feat(RingTheory/Perfectoid): Fontaine's theta map and the de Rham period rings	This PR continues the work from #21564. Original PR: https://github.com/leanprover-community/mathlib4/pull/21564	t-algebra t-number-theory merge-conflict label:t-algebra$	1026/15	Mathlib.lean,Mathlib/Algebra/Ring/Aut.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/PowTransition.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Perfectoid/BDeRham.lean,Mathlib/RingTheory/Perfectoid/FontaineTheta.lean,Mathlib/RingTheory/Perfectoid/Untilt.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/RingTheory/WittVector/Complete.lean,Mathlib/RingTheory/WittVector/TeichmullerSeries.lean,docs/references.bib	15	n/a	['github-actions', 'jjdishere', 'leanprover-community-bot-assistant', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	90-78118 2 months ago	unknown	unknown
26436	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Mathlib/Data/Nat/Prime/Defs): fuel Nat.minFac	This is a fueled version of docs#Nat.minFacAux that can now be checked by `decide`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	53/48	Mathlib/Data/Nat/Prime/Defs.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	90-78114 2 months ago	90-78114 2 months ago	8-58125 8 days
26776	sgouezel author:sgouezel	refactor: make `I` an outparam, and use forgetful inheritance in products	I consider this as a failed experiment, so it's not for merging. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	RFC merge-conflict WIP	2411/1664	Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ApproximatesLinearOn.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Calculus/TangentConeDef.lean,Mathlib/Analysis/Complex/Circle.lean,Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/Prod.lean,Mathlib/Analysis/NormedSpace/HomeomorphBall.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Basic.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/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/Manifold/AnalyticManifold.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/Complex.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Constructions.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/ContMDiff/NormedSpace.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/ModelWithCornersDef.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/FDeriv.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/MFDeriv/UniqueDifferential.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/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/Algebra/PontryaginDual.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/CWComplex/Classical/Basic.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/Connected/TotallyDisconnected.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Bounded/Basic.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/ContinuousOnMore.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/Defs/Basic.lean,Mathlib/Topology/Defs/Filter.lean,Mathlib/Topology/FiberBundle/Basic.lean,Mathlib/Topology/FiberBundle/Constructions.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/Instances/AddCircle.lean,Mathlib/Topology/Instances/Shrink.lean,Mathlib/Topology/Instances/TrivSqZeroExt.lean,Mathlib/Topology/Irreducible.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/LocallyFinite.lean,Mathlib/Topology/OmegaCompletePartialOrder.lean,Mathlib/Topology/Order/LeftRight.lean,Mathlib/Topology/PartialHomeomorph.lean,Mathlib/Topology/PartialHomeomorphMore.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Regular.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Cauchy.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean,Mathlib/Topology/VectorBundle/Basic.lean,Mathlib/Topology/VectorBundle/Hom.lean	88	0	[]	nobody	90-68199 2 months ago	90-68199 2 months ago	0-1 1 second
7596	alreadydone author:alreadydone	feat: covering maps from properly discontinuous actions and discrete subgroups	--- - [x] depends on: #23236 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-topology merge-conflict	350/21	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Pointwise.lean,Mathlib/Topology/Covering/AddCircle.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Galois.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Instances/AddCircle/Defs.lean	9	18	['ADedecker', 'alreadydone', 'digama0', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	90-32432 2 months ago	90-32433 2 months ago	73-67280 73 days
24405	mcdoll author:mcdoll	refactor(Topology/Algebra/Module/WeakDual): Clean up	- Move `Dual` and `dualPairing` lower in the import-hierachy - deduplicate `dualPairing` - Make `WeakDual` and `WeakSpace` reducible --- New version of #11500 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology merge-conflict	146/162	Mathlib.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Analysis/VonNeumannAlgebra/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/Topology/Algebra/Module/Dual.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,docs/overview.yaml,docs/undergrad.yaml	14	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	89-45685 2 months ago	89-45686 2 months ago	69-52361 69 days
26647	b-mehta author:b-mehta	feat(Data/Sym/Sym2): lift commutative operations to sym2	While we have `Sym2.lift`, it's often useful to lift operations which are known to be commutative to the typeclass system. Indeed, the existing `Sym2.mul` witnesses this already. Thus, this PR can also be seen as generalising `Sym2.mul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict WIP	48/28	Mathlib/Data/Sym/Sym2.lean,Mathlib/Data/Sym/Sym2/Finsupp.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/Basis.lean	4	12	['b-mehta', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	88-83846 2 months ago	88-83847 2 months ago	3-73380 3 days
26067	mapehe author:mapehe	feat(Topology/StoneCech): exists_continuous_surjection_from_StoneCech_to_dense_range	This lemma formalises the following version of the maximality property of the Stone–Čech compactification: If `f : α → β` is a continuous map from a topological space `α` to a Hausdorff space `β` with dense range, then there exists a continuous surjection from `StoneCech α` to `β` extending `f`. In particular, `StoneCech α` is the “largest” compact Hausdorff space into which `α` densely embeds, in the sense that any other such space is a continuous image of it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	18/0	Mathlib/Topology/StoneCech.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	87-61634 2 months ago	87-61634 2 months ago	20-8582 20 days
23990	robertmaxton42 author:robertmaxton42	feat (Types.Colimits): Quot is functorial and colimitEquivQuot is natural	Add `Functor.quotFunctor` to parallel `Functor.sectionsFunctor`, witnessing that `Quot` is functorial; add `colimNatIsoQuotFunctor` to parallel `limNatIsoSectionsFunctor`, witnessing that `colimitEquivQuot` is natural in the diagram $F$. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory merge-conflict awaiting-author	33/0	Mathlib/CategoryTheory/Limits/Types/Colimits.lean	1	5	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'robertmaxton42']	nobody	87-1977 2 months ago	87-1978 2 months ago	8-28043 8 days
10541	Louddy author:Louddy	feat(Algebra/SkewMonoidAlgebra/Basic): add SkewMonoidAlgebra	# Skew Monoid algebras This file presents a skewed version of `Mathlib.Algebra.MonoidAlgebra.Basic`. ## Definition We define `SkewMonoidAlgebra k G := G →₀ k` attached with a skewed convolution product. Here, the product of two elements `f g : SkewMonoidAlgebra k G` is the finitely supported function whose value at `a` is the sum of `f x * (x • g y)` over all pairs `x, y` such that `x * y = a`. This will be used in a later PR to define skew polynomial rings. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [x] depends on: #15878 - [x] depends on: #19084 - [x] depends on: #22078 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict WIP label:t-algebra$	1624/0	Mathlib.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/SkewMonoidAlgebra/Lift.lean	4	105	['AntoineChambert-Loir', 'Louddy', 'YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions', 'mariainesdff', 'mathlib4-dependent-issues-bot', 'mattrobball']	AntoineChambert-Loir assignee:AntoineChambert-Loir	86-49643 2 months ago	86-49645 2 months ago	179-12934 179 days
24103	plp127 author:plp127	feat(Topology/UniformSpace/OfCompactT2): generalize theorem	Generalize `uniformSpaceOfCompactT2` to `uniformSpaceOfCompactR1`. --- - [ ] depends on: #24098 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	48/24	Mathlib/Topology/Separation/Regular.lean,Mathlib/Topology/UniformSpace/OfCompactT2.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	86-37409 2 months ago	86-37410 2 months ago	76-65641 76 days
25999	bjoernkjoshanssen author:bjoernkjoshanssen	feat(Topology/Compactification): projective line over ℝ is homeomorphic to the one-point compactification of ℝ	This PR continues the work from #18306. Original PR: https://github.com/leanprover-community/mathlib4/pull/18306	t-topology merge-conflict	920/0	Mathlib.lean,Mathlib/Topology/Compactification/OnePointHomeomorph.lean,Mathlib/Topology/Compactification/OnePointRealLemmas.lean	3	3	['bjoernkjoshanssen', 'github-actions', 'leanprover-community-bot-assistant']	nobody	85-67708 2 months ago	87-61636 2 months ago	21-20473 21 days
24096	plp127 author:plp127	feat(Topology): Completely Regular Space iff Uniformizable	Proves that `CompletelyRegularSpace`s are uniformizable and that `UniformSpace`s are completely regular. --- - [x] depends on: #24179 - [x] depends on: #24173 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	339/1	Mathlib.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/Uniformizable.lean	5	10	['alreadydone', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'plp127']	nobody	84-34936 2 months ago	84-80353 2 months ago	2-8297 2 days
25710	Paul-Lez author:Paul-Lez	feat(Mathlib/Analysis/PDE/Quasilinear/Characteristics): the method of characteristics for first order quasilinear PDEs	--- - [x] depends on: #25708 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict WIP	531/0	Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/ODE/Gronwall.lean,Mathlib/Analysis/PDE/Quasilinear/Characteristics.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean,Mathlib/Topology/Separation/Basic.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	84-33129 2 months ago	84-33130 2 months ago	0-1343 22 minutes
21039	eric-wieser author:eric-wieser	hack: override `instance` to insert `fast_instance%`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict please-adopt	40/4	Mathlib/Algebra/Equiv/TransferInstance.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/Tactic/FastInstance.lean,Mathlib/Topology/FiberBundle/Basic.lean	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	84-24336 2 months ago	84-24336 2 months ago	0-0 0 seconds
26911	JovanGerb author:JovanGerb	chore: fix naming of `mono` and `monotone`	The naming convention says: "We use `_mono` for `a ≤ b → f a ≤ f b` and `_anti` for `a ≤ b → f b ≤ f a`, so we also use `_monotone` for `Monotone f`, `_antitone` for `Antitone f`, `_strictMono` for `StrictMono f`, `_strictAnti` for `StrictAnti f`, etc..." This PR swaps `mono`/`anti` and `monotone`/`antitone` where required so that `monotone` refers to `Monotone`, while `mono` refers to a lemma that might be tagged with `@[gcongr]` This PR does not address - `mul_left_monotone` and `mul_right_monotone` are exactly the wrong way around - `monotone_right`/`mono_right` vs `right_monotone`/`right_mono` - `monotone_arcsin` vs `arcsin_monotone` edit: TODO: `ideal_mono` and friends --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict delegated	238/171	Archive/Imo/Imo1962Q1.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Group/Finset.lean,Mathlib/Algebra/Order/Group/PosPart.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/Degree/CardPowDegree.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Normed/Order/UpperLower.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Combinatorics/SetFamily/Kleitman.lean,Mathlib/Combinatorics/SimpleGraph/Girth.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Lemma.lean,Mathlib/Computability/Ackermann.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/Nat/Choose/Factorization.lean,Mathlib/Data/Real/Pi/Bounds.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Constructions/Polish/Basic.lean,Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean,Mathlib/MeasureTheory/OuterMeasure/Operations.lean,Mathlib/NumberTheory/Bertrand.lean,Mathlib/NumberTheory/FermatPsp.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/Order/Concept.lean,Mathlib/Order/Filter/AtTopBot/Defs.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Heyting/Boundary.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Order/Hom/Set.lean,Mathlib/Order/Interval/Set/Fin.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/UpperLower/Closure.lean,Mathlib/Probability/StrongLaw.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/FractionalIdeal/Basic.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/MetricSpace/Antilipschitz.lean,Mathlib/Topology/MetricSpace/Holder.lean	59	8	['JovanGerb', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace', 'mathlib-bors']	bryangingechen assignee:bryangingechen	84-3041 2 months ago	84-32065 2 months ago	2-60107 2 days
21838	joneugster author:joneugster	feat(Cache): Allow arguments of the form `Mathlib.Data` which correspond to a folder but not a file	--- - [x] depends on: #21834 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI t-meta merge-conflict awaiting-author	34/11	Cache/IO.lean,Cache/Main.lean	2	11	['eric-wieser', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	82-25193 2 months ago	82-25194 2 months ago	50-67617 50 days
25611	erdOne author:erdOne	chore(RingTheory): add `Algebra (FractionRing R) (FractionRing S)`	Co-authored-by: Yakov Pechersky --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	152/108	Mathlib.lean,Mathlib/Algebra/Algebra/NonZeroDivisors.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/IntegralClosure/IntegralRestrict.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Localization/FractionRingAlgebra.lean,Mathlib/RingTheory/Localization/Integral.lean	10	20	['alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky']	nobody	80-50452 2 months ago	80-50453 2 months ago	36-35321 36 days
27310	ADedecker author:ADedecker	chore: semilinearize LinearAlgebra.TensorProduct.Basic	This PR continues the work from #24208. Original PR: https://github.com/leanprover-community/mathlib4/pull/24208	t-algebra merge-conflict label:t-algebra$	191/138	Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/LinearAlgebra/BilinearForm/TensorProduct.lean,Mathlib/LinearAlgebra/BilinearMap.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Associator.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/Coalgebra/Hom.lean	12	0	[]	nobody	75-38050 2 months ago	75-38050 2 months ago	0-49 49 seconds
25284	alreadydone author:alreadydone	feat(LinearAlgebra/Contraction): bijectivity of `dualTensorHom` + generalize to CommSemiring	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	167/32	Mathlib/Data/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/LinearAlgebra/Trace.lean,Mathlib/RingTheory/Finiteness/Finsupp.lean	5	16	['alreadydone', 'eric-wieser', 'github-actions', 'kckennylau', 'leanprover-bot', 'leanprover-community-bot-assistant']	nobody	73-14992 2 months ago	73-14992 2 months ago	47-45899 47 days
22749	joelriou author:joelriou	feat(CategoryTheory/Abelian): the Gabriel-Popescu theorem as a localization with respect to a Serre class	This PR introduces a structure `GabrielPopescuPackage C` which contains the information to say that the abelian category `C` is a localization of a category of modules with respect to a suitable Serre class. --- - [x] depends on: #26033 - [ ] depends on: #26663 - [x] depends on: #22733 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	202/6	Mathlib.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/ModuleEmbedding/GabrielPopescu.lean,Mathlib/CategoryTheory/Abelian/SerreClass/Bousfield.lean,Mathlib/CategoryTheory/Abelian/SerreClass/MorphismProperty.lean,Mathlib/CategoryTheory/ObjectProperty/ContainsZero.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	72-58278 2 months ago	72-58280 2 months ago	0-10930 3 hours
26784	eric-wieser author:eric-wieser	chore: remove suppress_compilation	Still not exhaustive. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	0/37	Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/Colimit/Module.lean,Mathlib/Algebra/Colimit/Ring.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/Analysis/Normed/Algebra/Unitization.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Basic.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Bilinear.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Completeness.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Mul.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NNNorm.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean,Mathlib/CategoryTheory/Abelian/Projective/Resolution.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean	18	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	72-30539 2 months ago	72-30540 2 months ago	0-0 0 seconds
26804	kckennylau author:kckennylau	(WIP) feat(SetTheory): ZFSet is a model of ZFC	--- Depends on: * [ ] #26644 `Mathlib/SetTheory/ZFC/Model.lean` is the main file, and it starts at Line 346. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict WIP	1245/0	Mathlib.lean,Mathlib/SetTheory/ZFC/Axioms.lean,Mathlib/SetTheory/ZFC/Model.lean,docs/references.bib	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	71-68397 2 months ago	71-68398 2 months ago	0-163 2 minutes
20428	madvorak author:madvorak	feat(Data/Sign): lemmas about `∈ Set.range SignType.cast`	--- Perhaps `in_set_range_singType_cast_iff_abs` needs to be moved somewhere downstream.	t-data merge-conflict WIP	40/0	Mathlib/Data/Sign.lean	1	10	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak']	nobody	71-60890 2 months ago	71-60891 2 months ago	0-0 0 seconds
26608	vihdzp author:vihdzp	feat(SetTheory/Cardinal/Aleph): `o.card ≤ ℵ_ o` and variants	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	24/0	Mathlib/SetTheory/Cardinal/Aleph.lean	1	3	['github-actions', 'kckennylau', 'leanprover-community-bot-assistant']	nobody	70-24909 2 months ago	70-24910 2 months ago	23-63406 23 days
20029	FrederickPu author:FrederickPu	Allow for Config attributes to be set directly	Allow for Config attributes to be set directly when using initialize_simp_projection as per issue #19895 Basically modified initialize_simp_projection so that the user has the option of specifying a tuple of config option values. Ex: ``` initialize_simp_projection MulEquiv (toFun → apply, invFun → symm_apply) (fullyApplied := false) ``` These config options are then converted into projections. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta merge-conflict WIP	34/4	Mathlib/Tactic/Simps/Basic.lean	1	11	['FrederickPu', 'YaelDillies', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant']	nobody	70-21590 2 months ago	70-21591 2 months ago	0-34081 9 hours
13973	digama0 author:digama0	feat: lake exe refactor, initial framework	This is the initial framework code for `lake exe refactor`. To use it, you add your refactoring to `Refactor/Main.lean` (note, you have to actually write some metaprogramming code here for the refactoring itself), and the harness will run it on specified files and apply the generated edits. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author	139/0	Refactor/Main.lean,lakefile.lean	2	11	['adomani', 'digama0', 'eric-wieser', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	66-42451 2 months ago	66-42452 2 months ago	4-80741 4 days
26498	EtienneC30 author:EtienneC30	feat: projections and injections for WithLp	Introduce `WithLp.fst` and `WithLp.snd` to avoid defeq abuse by writing `x.1` when `x : WithLp p (α × β)`. Also add a `ContinuousLinearMap` version. Introduce `WithLp.inl` (resp. `WithLp.inr`) as a linear isometry from `α` (resp. β) to `WithLp p (α × β)`. Introduce `PiLp.single` as a linear isometry from `β i` to `PiLp p β`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	107/7	Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/LinearAlgebra/Pi.lean	4	11	['EtienneC30', 'b-mehta', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	64-53337 2 months ago	64-53337 2 months ago	5-313 5 days
12181	adomani author:adomani	lint also `let` vs `have`	This PR is symmetrical to #12157: here we lint for non-`Type`-valued `let`s. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	797/544	Archive/Imo/Imo1962Q1.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Mathlib.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/DirectLimit.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/Homology/HomologicalComplexBiprod.lean,Mathlib/Algebra/Homology/HomologySequence.lean,Mathlib/Algebra/Homology/HomotopyCategory/Pretriangulated.lean,Mathlib/Algebra/Homology/Localization.lean,Mathlib/Algebra/Homology/ShortComplex/Abelian.lean,Mathlib/Algebra/Homology/ShortComplex/ConcreteCategory.lean,Mathlib/Algebra/Homology/ShortComplex/Exact.lean,Mathlib/Algebra/Homology/ShortComplex/ExactFunctor.lean,Mathlib/Algebra/Homology/ShortComplex/Homology.lean,Mathlib/Algebra/Homology/ShortComplex/LeftHomology.lean,Mathlib/Algebra/Homology/ShortComplex/Linear.lean,Mathlib/Algebra/Homology/ShortComplex/Preadditive.lean,Mathlib/Algebra/Homology/ShortComplex/PreservesHomology.lean,Mathlib/Algebra/Homology/ShortComplex/QuasiIso.lean,Mathlib/Algebra/Homology/ShortComplex/RightHomology.lean,Mathlib/Algebra/Lie/Engel.lean,Mathlib/Algebra/Lie/Killing.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Module/Submodule/Localization.lean,Mathlib/Algebra/Module/Zlattice.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiCompact.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiSeparated.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/Pullbacks.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicTopology/DoldKan/Homotopies.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/Rademacher.lean,Mathlib/Analysis/Complex/Tietze.lean,Mathlib/Analysis/Convex/Between.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/Rayleigh.lean,Mathlib/Analysis/NormedSpace/ContinuousAffineMap.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Completeness.lean,Mathlib/Analysis/NormedSpace/Spectrum.lean,Mathlib/Analysis/SpecialFunctions/Integrals.lean,Mathlib/CategoryTheory/Abelian/Basic.lean,Mathlib/CategoryTheory/Abelian/Exact.lean,Mathlib/CategoryTheory/Abelian/Pseudoelements.lean,Mathlib/CategoryTheory/Abelian/Transfer.lean,Mathlib/CategoryTheory/Adhesive.lean,Mathlib/CategoryTheory/Closed/Cartesian.lean,Mathlib/CategoryTheory/Closed/Monoidal.lean,Mathlib/CategoryTheory/Comma/Arrow.lean,Mathlib/CategoryTheory/EffectiveEpi/Extensive.lean,Mathlib/CategoryTheory/Extensive.lean,Mathlib/CategoryTheory/Functor/EpiMono.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/CategoryTheory/Galois/Decomposition.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/GradedObject/Trifunctor.lean,Mathlib/CategoryTheory/IsConnected.lean,Mathlib/CategoryTheory/Limits/ConcreteCategory.lean,Mathlib/CategoryTheory/Limits/Constructions/EpiMono.lean,Mathlib/CategoryTheory/Limits/Constructions/WeaklyInitial.lean,Mathlib/CategoryTheory/Limits/FilteredColimitCommutesFiniteLimit.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/FintypeCat.lean,Mathlib/CategoryTheory/Limits/Fubini.lean,Mathlib/CategoryTheory/Limits/IsLimit.lean,Mathlib/CategoryTheory/Limits/Preserves/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/FiniteLimits.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Localization/LocalizerMorphism.lean,Mathlib/CategoryTheory/Localization/Pi.lean,Mathlib/CategoryTheory/Localization/Resolution.lean,Mathlib/CategoryTheory/Monad/Monadicity.lean,Mathlib/CategoryTheory/PUnit.lean,Mathlib/CategoryTheory/Sites/Coherent/CoherentSheaves.lean,Mathlib/CategoryTheory/Sites/Coherent/RegularSheaves.lean,Mathlib/CategoryTheory/Sites/Coverage.lean,Mathlib/CategoryTheory/Sites/LeftExact.lean,Mathlib/CategoryTheory/Sites/Preserves.lean,Mathlib/CategoryTheory/Sites/Pullback.lean,Mathlib/CategoryTheory/Sites/Sheaf.lean,Mathlib/CategoryTheory/Triangulated/Pretriangulated.lean,Mathlib/Combinatorics/Colex.lean,Mathlib/Combinatorics/SetFamily/Kleitman.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity.lean	271	0	[]	nobody	64-52767 2 months ago	64-52767 2 months ago	0-0 0 seconds
11021	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology) : add join of augmented SSets	This pull-request adds the definition of the join of augmented SSets defined as contravariant functors from `WithInitial SimplexCategory` to `Type u`. In addition it shows that the join of two standard augmented SSets is again an augmented SSets. From this the definition of the join of simplicial sets should follow easily. To aid the above theory, an api for `WithInitial SimplexCategory` has been created, with the notion of the `join` and `split` (forming a sort of inverse to join) of objects in this category are defined. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict WIP	2137/1	.gitignore,Mathlib.lean,Mathlib/AlgebraicTopology/Join.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SimplexCategoryWithInitial.lean,Mathlib/AlgebraicTopology/SimplicialSet.lean	6	47	['github-actions', 'jcommelin']	nobody	64-52749 2 months ago	64-52749 2 months ago	1-20125 1 day
10190	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): add Augmented Simplex Category	- Added the definition of the category FinLinOrd of finite linear ordered sets. - Added the definition of the augmented simplex category `AugmentedSimplexCategory`, and showed it is the Skeleton of FinLinOrd. - Showed that the category of augmented simplicial objects defined as a comma category is equivalent to the category of functors from `AugmentedSimplexCategory^\op` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor t-category-theory merge-conflict WIP	720/0	Mathlib.lean,Mathlib/AlgebraicTopology/AugmentedSimplexCategory.lean,Mathlib/AlgebraicTopology/SimplicialObject.lean,Mathlib/Order/Category/FinLinOrd.lean	4	5	['TwoFX', 'YaelDillies', 'joelriou', 'jstoobysmith']	nobody	64-52705 2 months ago	64-52705 2 months ago	7-63215 7 days
10084	alreadydone author:alreadydone	draft for Van Kampen	The part about the homotopy lifting property for covering maps has been extracted to #22649 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology merge-conflict WIP	91/24	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/VanKampen.lean	2	1	['leanprover-community-bot-assistant']	nobody	64-52614 2 months ago	64-52614 2 months ago	0-0 0 seconds
26303	joelriou author:joelriou	feat(AlgebraicTopology): the fundamental lemma of homotopical algebra	Given a model category `C`, the fundamental lemma of homotopical algebra (Quillen) shows that it is possible to compute morphisms in the homotopy category of `C` (the localized category with respect to weak equivalences) from `X` to `Y` as a quotient of the type of morphisms from `X` to `Y` in `C` modulo an homotopy relation, when `X` is cofibrant and `Y` is fibrant. In particular, we obtain a version of the Whitehead theorem: a weak equivalence between bifibrant objects (both cofibrant and fibrant) is a homotopy equivalence. We also show that we obtain equivalent categories if we localize `C` or various fullsubcategories (cofibrant objetss, fibrant objects, bifibrant objects) with respect to weak equivalences. (This improves the first formalization I made in 2022 in Lean 3.) (This is sorry-free, but still WIP. In order to do clean proofs, we shall also need the refactor of fullsubcategories...) --- - [x] depends on: #26171 - [x] depends on: #26166 - [x] depends on: #26365 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology large-import t-category-theory merge-conflict WIP	3174/31	Mathlib.lean,Mathlib/AlgebraicTopology/ModelCategory/Basic.lean,Mathlib/AlgebraicTopology/ModelCategory/Bifibrant.lean,Mathlib/AlgebraicTopology/ModelCategory/BrownLemma.lean,Mathlib/AlgebraicTopology/ModelCategory/CategoryWithCofibrations.lean,Mathlib/AlgebraicTopology/ModelCategory/Cylinder.lean,Mathlib/AlgebraicTopology/ModelCategory/DerivabilityStructure.lean,Mathlib/AlgebraicTopology/ModelCategory/FundamentalLemma1.lean,Mathlib/AlgebraicTopology/ModelCategory/FundamentalLemma2.lean,Mathlib/AlgebraicTopology/ModelCategory/FundamentalLemma3.lean,Mathlib/AlgebraicTopology/ModelCategory/Homotopy.lean,Mathlib/AlgebraicTopology/ModelCategory/Instances.lean,Mathlib/AlgebraicTopology/ModelCategory/IsCofibrant.lean,Mathlib/AlgebraicTopology/ModelCategory/PathObject.lean,Mathlib/CategoryTheory/Localization/CalculusOfFractions/OfAdjunction.lean,Mathlib/CategoryTheory/Localization/Opposite.lean,Mathlib/CategoryTheory/Localization/Predicate.lean,Mathlib/CategoryTheory/Localization/Quotient.lean,Mathlib/CategoryTheory/MorphismProperty/Quotient.lean	19	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	64-52540 2 months ago	unknown	unknown
20719	gio256 author:gio256	feat(AlgebraicTopology): delaborators for truncated simplicial notations	We add delaborators for the following notations, introduced in #20688: - `⦋m⦌ₙ`, which denotes the `m`-dimensional simplex in the `n`-truncated simplex category. - `X _⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated simplicial object `X`. - `X ^⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated cosimplicial object `X`. If `pp.proofs` is set to `true`, we also pretty-print the proof `p : m ≤ n` for all three notations as `⦋m, p⦌ₙ`, `X _⦋m, p⦌ₙ`, and `X ^⦋m, p⦌ₙ`, respectively. Credit to @kmill for one piece of code and much metaprogramming inspiration. --- - [x] depends on: #20688 - [x] depends on: #23018 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology infinity-cosmos t-meta merge-conflict	525/33	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SimplexCategory.lean,Mathlib/Util/Superscript.lean,MathlibTest/SimplexCategory.lean,MathlibTest/SimplicialObject.lean,MathlibTest/superscript.lean,scripts/noshake.json	11	23	['eric-wieser', 'gio256', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	eric-wieser assignee:eric-wieser	64-52511 2 months ago	64-52511 2 months ago	88-84229 88 days
26926	adomani author:adomani	draft: `commandStart` more	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict awaiting-author WIP	3160/1085	Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Algebra/Divisibility/Basic.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/Commute/Units.lean,Mathlib/Algebra/Group/Hom/CompTypeclasses.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Semiconj/Basic.lean,Mathlib/Algebra/Group/Semiconj/Units.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/Embedding/Boundary.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexShift.lean,Mathlib/Algebra/Lie/LieTheorem.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Notation/Lemmas.lean,Mathlib/Algebra/Notation/Pi.lean,Mathlib/Algebra/Order/Antidiag/Pi.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/Sequence.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/AlgebraicTopology/DoldKan/Degeneracies.lean,Mathlib/AlgebraicTopology/DoldKan/FunctorGamma.lean,Mathlib/AlgebraicTopology/DoldKan/Homotopies.lean,Mathlib/AlgebraicTopology/DoldKan/HomotopyEquivalence.lean,Mathlib/AlgebraicTopology/DoldKan/NCompGamma.lean,Mathlib/AlgebraicTopology/DoldKan/Normalized.lean,Mathlib/AlgebraicTopology/DoldKan/Projections.lean,Mathlib/AlgebraicTopology/DoldKan/SplitSimplicialObject.lean,Mathlib/Analysis/InnerProductSpace/Laplacian.lean,Mathlib/Analysis/Normed/Field/Lemmas.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/Extensive.lean,Mathlib/CategoryTheory/FiberedCategory/Cocartesian.lean,Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/CategoryTheory/Functor/KanExtension/Preserves.lean,Mathlib/CategoryTheory/Functor/OfSequence.lean,Mathlib/CategoryTheory/Limits/Bicones.lean,Mathlib/CategoryTheory/Limits/Constructions/Over/Products.lean,Mathlib/CategoryTheory/Limits/Final/ParallelPair.lean,Mathlib/CategoryTheory/Limits/Preserves/Bifunctor.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Pullbacks.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/FiniteLimits.lean,Mathlib/CategoryTheory/Limits/Shapes/Multiequalizer.lean,Mathlib/CategoryTheory/Limits/Shapes/WideEqualizers.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/CategoryTheory/Localization/Construction.lean,Mathlib/CategoryTheory/Localization/Pi.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Sites/MayerVietorisSquare.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Removal.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Control/ULiftable.lean,Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Fin/Fin2.lean,Mathlib/Data/Finmap.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Finset/Insert.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finsupp/Option.lean,Mathlib/Data/Fintype/Fin.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Destutter.lean,Mathlib/Data/List/Indexes.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/Perm/Basic.lean,Mathlib/Data/List/Rotate.lean,Mathlib/Data/List/TakeWhile.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/UnionInter.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Order/Ring.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/Data/Nat/Factorial/SuperFactorial.lean,Mathlib/Data/Nat/Fib/Basic.lean,Mathlib/Data/Nat/Find.lean,Mathlib/Data/Nat/Init.lean	266	18	['MichaelStollBayreuth', 'adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	64-52376 2 months ago	64-52376 2 months ago	0-0 0 seconds
9935	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): add constructors for horns	Added a function that given a simplicial set S and a set of n-1 simplexes satisfying certain conditions, creates a morphism in SSet from a n horn to a simplicial set S. Included also are a series of lemmas and definitions used in this construction. In particular I define a function that takes a m-simplex in a horn, and returns the smallest 'index' of face it factors through, and give a series of lemmas related to this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict awaiting-author	462/2	Mathlib/AlgebraicTopology/SimplicialSet.lean	1	15	['YaelDillies', 'jcommelin', 'jstoobysmith', 'kim-em', 'linesthatinterlace']	nobody	64-52106 2 months ago	64-52106 2 months ago	14-58814 14 days
25914	eric-wieser author:eric-wieser	feat: add an ext lemma for the opposite category	This powers up `aesop_cat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-CI merge-conflict awaiting-author	18/56	Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/CategoryTheory/Abelian/Opposite.lean,Mathlib/CategoryTheory/Category/RelCat.lean,Mathlib/CategoryTheory/GuitartExact/Opposite.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Triangulated/Opposite/Functor.lean,Mathlib/Combinatorics/Quiver/Basic.lean	9	7	['eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'robin-carlier']	nobody	64-50348 2 months ago	90-80268 2 months ago	1-77289 1 day
20208	js2357 author:js2357	feat: Define the localization of a fractional ideal at a prime ideal	Define the localization of a fractional ideal at a prime ideal, and prove some basic properties. --- Alternate version of #14237 generalized to use `IsLocalization` and `IsFractionRing` rather than `Localization.AtPrime` and `FractionRing` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	248/0	Mathlib.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	64-35591 2 months ago	64-35592 2 months ago	0-21 21 seconds
19415	vihdzp author:vihdzp	chore: move results on `Σ i : Fin n, f i` earlier	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-CI merge-conflict	131/145	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Order/Antidiag/Pi.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/AlgebraicTopology/AlternatingFaceMapComplex.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/Optimization/ValuedCSP.lean,Mathlib/Data/Fin/Tuple/NatAntidiagonal.lean,Mathlib/Data/Fin/Tuple/Reflection.lean,Mathlib/Data/Fintype/BigOperators.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/LinearAlgebra/LinearIndependent.lean	13	4	['YaelDillies', 'github-actions', 'grunweg', 'vihdzp']	nobody	64-25893 2 months ago	305-64031 10 months ago	0-0 0 seconds
24260	plp127 author:plp127	feat(Topology): add API for Hereditarily Lindelof spaces	Copies the stuff about Lindelof spaces to Hereditarily Lindelof spaces. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict awaiting-author	222/42	Mathlib/Topology/Compactness/Lindelof.lean	1	15	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'urkud']	urkud assignee:urkud	64-5163 2 months ago	64-5164 2 months ago	29-42365 29 days
27181	ADedecker author:ADedecker	chore: more conceptual definition of `ValuativeRel.ValueGroupWithZero`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict label:t-algebra$	685/467	Mathlib.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/GroupWithZero.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/NonZeroDivisors.lean,Mathlib/RingTheory/OreLocalization/Ring.lean,Mathlib/RingTheory/Valuation/ValuativeRel.lean	9	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	64-5152 2 months ago	64-5153 2 months ago	0-0 0 seconds
27608	RemyDegenne author:RemyDegenne	feat(MeasureTheory): typeclasses for measures with finite moments	WIP because it seems useful for #26291 but I want to investigate more. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict WIP	97/17	Mathlib.lean,Mathlib/MeasureTheory/Measure/Typeclasses/FiniteMoments.lean,Mathlib/Probability/Moments/CovarianceBilin.lean	3	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	63-40028 2 months ago	63-40029 2 months ago	0-1 1 second
26306	j-loreaux author:j-loreaux	refactor: make `IsSelfAdjoint` and `IsIdempotentElem` one-field structures.	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	222/224	Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/DirectSum/Idempotents.lean,Mathlib/Algebra/Group/Idempotent.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/GroupWithZero/Idempotent.lean,Mathlib/Algebra/Order/Ring/Idempotent.lean,Mathlib/Algebra/Order/Ring/Star.lean,Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Ring/Idempotent.lean,Mathlib/Algebra/Star/Module.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/Algebra/Star/StarProjection.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/Morphisms/FormallyUnramified.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/CStarAlgebra/Module/Defs.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Data/Complex/Module.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/LinearAlgebra/Matrix/HermitianFunctionalCalculus.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/NumberTheory/NumberField/Completion.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/IdempotentFG.lean,Mathlib/RingTheory/Ideal/Span.lean,Mathlib/RingTheory/Idempotents.lean,Mathlib/RingTheory/Localization/Away/Basic.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/RingTheory/Unramified/Field.lean,Mathlib/RingTheory/Unramified/Finite.lean,Mathlib/RingTheory/Unramified/Pi.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	48	6	['github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'themathqueen']	nobody	63-39794 2 months ago	64-72273 2 months ago	37-45446 37 days
25726	tb65536 author:tb65536	(WIP) Galois group of `x ^ n - x - 1`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict WIP label:t-algebra$	512/145	Archive/Wiedijk100Theorems/AbelRuffini.lean,Mathlib/RingTheory/Polynomial/Selmer.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	61-61118 2 months ago	61-61118 2 months ago	0-1 1 second
26344	mans0954 author:mans0954	feature(Analysis/NormedSpace/MStructure): The component projections on WithLp 1 (α × β) are L-projections	This PR continues the work from #20380. Original PR: https://github.com/leanprover-community/mathlib4/pull/20380	file-removed t-analysis merge-conflict WIP	20/1	Mathlib.lean,Mathlib/Analysis/Normed/Lp/MStructure.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean	3	3	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	61-60870 2 months ago	61-60871 2 months ago	5-43696 5 days
27870	grunweg author:grunweg	draft: commandStart more --- fixing grounds	A version of #26926 where I can slowly work towards fixing some violations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict WIP	2981/906	Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Divisibility/Basic.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/Hom/CompTypeclasses.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Semiconj/Basic.lean,Mathlib/Algebra/Group/Semiconj/Units.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexShift.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Notation/Pi.lean,Mathlib/Algebra/Order/Antidiag/Pi.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/Sequence.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Analysis/InnerProductSpace/Laplacian.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/CategoryTheory/FiberedCategory/Cocartesian.lean,Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/CategoryTheory/Functor/KanExtension/Preserves.lean,Mathlib/CategoryTheory/Limits/Preserves/Bifunctor.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Removal.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Control/ULiftable.lean,Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Fin/Fin2.lean,Mathlib/Data/Finmap.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Fintype/Fin.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Destutter.lean,Mathlib/Data/List/Indexes.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/Perm/Basic.lean,Mathlib/Data/List/Rotate.lean,Mathlib/Data/List/TakeWhile.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/UnionInter.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/Data/Nat/Factorial/SuperFactorial.lean,Mathlib/Data/Nat/Log.lean,Mathlib/Data/Option/Basic.lean,Mathlib/Data/PSigma/Order.lean,Mathlib/Data/Part.lean,Mathlib/Data/Prod/Basic.lean,Mathlib/Data/Real/Pi/Bounds.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Seq/Seq.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Defs.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Sigma/Order.lean,Mathlib/Data/Stream/Init.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/Data/TypeVec.lean,Mathlib/Data/Vector/Basic.lean,Mathlib/Geometry/Manifold/PoincareConjecture.lean,Mathlib/Geometry/Manifold/VectorBundle/SmoothSection.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/CoprodI.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/Coxeter/Inversion.lean,Mathlib/GroupTheory/Coxeter/Length.lean,Mathlib/GroupTheory/FixedPointFree.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/Primitive.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/HNNExtension.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/GroupTheory/Perm/Centralizer.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/GroupTheory/Perm/DomMulAct.lean,Mathlib/GroupTheory/PushoutI.lean,Mathlib/GroupTheory/SpecificGroups/Dihedral.lean,Mathlib/GroupTheory/SpecificGroups/Quaternion.lean,Mathlib/LinearAlgebra/BilinearForm/TensorProduct.lean,Mathlib/LinearAlgebra/CliffordAlgebra/EvenEquiv.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Prod.lean,Mathlib/LinearAlgebra/Eigenspace/Matrix.lean	202	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	61-57027 2 months ago	61-57028 2 months ago	0-0 0 seconds
27445	erdOne author:erdOne	chore(RingTheory/LocalRing): fix problematic instance	We shouldn't use `RingHom.toAlgebra` for `Algebra (ResidueField R) (ResidueField S)`. The smul should come from the smul field in `Algebra`. - Redefined `Algebra (ResidueField R) (ResidueField S)` via `Ideal.Quotient.algebraOfLiesOver`, and provided missing `IsScalarTower` instances for it. - Added missing `IsScalarTower` for `Localization.AtPrime`. - Removed `Algebra p.ResidueField q.ResidueField` and the `IsScalarTower` instances coming with it (because there are `inferInstance` now) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	37/37	Mathlib/Algebra/Order/Archimedean/Submonoid.lean,Mathlib/RingTheory/LocalRing/ResidueField/Algebraic.lean,Mathlib/RingTheory/LocalRing/ResidueField/Basic.lean,Mathlib/RingTheory/LocalRing/ResidueField/Ideal.lean,Mathlib/RingTheory/LocalRing/ResidueField/Instances.lean,Mathlib/RingTheory/Localization/AtPrime.lean,Mathlib/RingTheory/Unramified/LocalRing.lean	7	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	61-25160 2 months ago	61-25160 2 months ago	9-82484 9 days
27267	JovanGerb author:JovanGerb	chore(Order): refactor in preparation for `to_dual`	WIP --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	60/52	Mathlib/Data/Nat/Find.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Defs/PartialOrder.lean,Mathlib/Tactic/Linarith/Frontend.lean,Mathlib/Tactic/Positivity/Core.lean	6	2	['github-actions', 'leanprover-community-bot-assistant']	bryangingechen assignee:bryangingechen	60-59724 1 month ago	60-59729 1 month ago	0-0 0 seconds
26383	eric-wieser author:eric-wieser	feat: `Real.sin_eq_one_iff` and similar	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	155/101	Mathlib/Algebra/ModEq.lean,Mathlib/Analysis/SpecialFunctions/Complex/Log.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Complex.lean	5	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	60-59256 1 month ago	60-59256 1 month ago	0-0 0 seconds
25991	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve): generalise nonsingular condition	This PR continues the work from #25219. Original PR: https://github.com/leanprover-community/mathlib4/pull/25219	t-algebraic-geometry merge-conflict	2127/1561	Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Span.lean	15	n/a	['github-actions', 'leanprover-community-bot-assistant']	nobody	60-59138 1 month ago	unknown	unknown
25985	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/Jacobian): add equivalences between points and explicit WithZero types	This PR continues the work from #14923. Original PR: https://github.com/leanprover-community/mathlib4/pull/14923	t-algebraic-geometry merge-conflict	262/66	Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,scripts/style-exceptions.txt	4	1	['Multramate']	nobody	60-59126 1 month ago	60-59126 1 month ago	0-48 48 seconds
25984	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/Affine): add equivalences between points and explicit WithZero types	This PR continues the work from #14627. Original PR: https://github.com/leanprover-community/mathlib4/pull/14627	t-algebraic-geometry merge-conflict	159/52	Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean	2	1	['Multramate']	nobody	60-59122 1 month ago	60-59122 1 month ago	0-55 55 seconds
25983	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/Scheme): define the affine scheme associated to an elliptic curve	This PR continues the work from #14130. Original PR: https://github.com/leanprover-community/mathlib4/pull/14130	t-algebraic-geometry merge-conflict	557/22	Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Scheme.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean	6	1	['Multramate']	nobody	60-59117 1 month ago	60-59117 1 month ago	0-0 0 seconds
25982	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/Group): compute range of baseChange	This PR continues the work from #10142. Original PR: https://github.com/leanprover-community/mathlib4/pull/10142	t-algebraic-geometry merge-conflict	421/212	Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Weierstrass.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/Subgroup/Basic.lean,Mathlib/GroupTheory/Submonoid/Operations.lean	6	1	['Multramate']	nobody	60-59112 1 month ago	60-59112 1 month ago	0-57 57 seconds
25981	Multramate author:Multramate	feat(GroupTheory/GroupAction/Basic): define homomorphisms of fixed subgroups induced by homomorphisms of groups	This PR continues the work from #10126. Original PR: https://github.com/leanprover-community/mathlib4/pull/10126	t-group-theory merge-conflict	81/12	Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/Subgroup/Basic.lean,Mathlib/GroupTheory/Submonoid/Operations.lean	3	0	[]	nobody	60-59106 1 month ago	60-59106 1 month ago	0-52 52 seconds
25980	Multramate author:Multramate	feat(GroupTheory/Submonoid/Operations): define homomorphisms of subgroups induced by homomorphisms of groups	This PR continues the work from #10113. Original PR: https://github.com/leanprover-community/mathlib4/pull/10113	t-group-theory merge-conflict	29/6	Mathlib/GroupTheory/Subgroup/Basic.lean,Mathlib/GroupTheory/Submonoid/Operations.lean	2	0	[]	nobody	60-59101 1 month ago	60-59101 1 month ago	0-54 54 seconds
25485	VTrelat author:VTrelat	feat(SetTheory/ZFC/Naturals): define natural numbers in ZFC	Extend the model of ZFC with naturals: - define a set `Nat` of naturals following the usual construction (∅, {∅}, {∅, {∅}}, ...) - define a proper type `ZFNat` representing naturals - add theorems on usual algebraic properties of naturals - provide a recursor and induction schemes to define/prove by induction --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depend on: #25483	t-set-theory new-contributor merge-conflict	2095/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Naturals.lean	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	60-58926 1 month ago	60-58926 1 month ago	29-51653 29 days
25474	adomani author:adomani	test for .lean/.md check	A test PR for #25473. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-linter merge-conflict	10/1	.github/workflows/lint_and_suggest_pr.yml,Mathlib.lean,Mathlib/NumberTheory/NumberField/CMField.Lean	3	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	60-58915 1 month ago	60-58915 1 month ago	29-67280 29 days
25425	Paul-Lez author:Paul-Lez	feat(LinearAlgebra/Basis/HasCanonicalBasis): propose `HasCanonicalBasis` class	Context: in some cases, e.g. writing down PDEs, having a notion of partial derivatives can be useful. In an ideal world (as mentioned by @ocfnash in [this Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Partial.20derivatives/with/463936246)), one could write something along the lines of `open scoped PartialDerivatives` in order to access nice notation for this. This PR introduces a notion of a canonical basis for a module in order to allow taking partial derivatives with respect to it. A later PR (which I am about open) would then propose a notation for taking partial derivatives (defined using `lineDeriv` in order to avoid requiring Frechet-differentiability assumptions). The goal here is to have notation that works equally well on e.g. `𝕜 × 𝕜` and `EuclideanSpace 𝕜 (Fin 2)` and so on. I've opened this PR as a draft in order to get some initial feedback on the content (and whether this is considered appropriate for Mathlib!); the file itself would need to be split (e.g. the instances defined should probably go in different files) Co-authored-by: Eric Wieser --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	105/0	Mathlib.lean,Mathlib/LinearAlgebra/Basis/HasCanonicalBasis.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	60-58906 1 month ago	60-58906 1 month ago	0-0 0 seconds
25362	adomani author:adomani	feat: a linter for duplicated `open`	This linter warns when a namespace is repeated. It makes an effort to report only the problematic namespaces, but is not especially robust. The linter has some awareness of the `namespace` command, so ```lean def X.Y := 0 open X namespace X open Y ``` will flag both `namespace X` and `open Y` as problematic, even though it was the `open `X` that became redundant with `namespace X`. However, I will not have much time to devote to polishing this and there are quite a few exception in Mathlib before a better version could be seriously considered for adoption. [#mathlib4 > linter requests @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/linter.20requests/near/520273644) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict please-adopt	191/94	Mathlib.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/GroupWithZero/Pi.lean,Mathlib/Algebra/Order/Ring/InjSurj.lean,Mathlib/CategoryTheory/Functor/ReflectsIso/Basic.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Finite/Defs.lean,Mathlib/Data/Ineq.lean,Mathlib/Data/List/Lemmas.lean,Mathlib/Data/List/NatAntidiagonal.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/Data/Nat/Prime/Basic.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Init.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Embedding/Set.lean,Mathlib/Logic/Pairwise.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/WithBot.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ApplyFun.lean,Mathlib/Tactic/Bound.lean,Mathlib/Tactic/CongrM.lean,Mathlib/Tactic/Find.lean,Mathlib/Tactic/Lift.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/DupOpen.lean,Mathlib/Tactic/NormNum/PowMod.lean,Mathlib/Tactic/Recover.lean,Mathlib/Tactic/ReduceModChar.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/SelectInsertParamsClass.lean,Mathlib/Tactic/Widget/StringDiagram.lean,Mathlib/Topology/CWComplex/Abstract/Basic.lean,Mathlib/Topology/ContinuousMap/Interval.lean,Mathlib/Topology/Germ.lean,Mathlib/Topology/Homotopy/HSpaces.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/Order/PartialSups.lean,Mathlib/Topology/Separation/DisjointCover.lean,Mathlib/Topology/Sheaves/Sheafify.lean,Mathlib/Util/CountHeartbeats.lean,MathlibTest/DupOpen.lean	47	14	['adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	60-58901 1 month ago	60-58901 1 month ago	0-0 0 seconds
25238	Hagb author:Hagb	feat(Tactic/ComputeDegree): add support for scalar multiplication with different types	It would be able to deal with `a • (X : R[X])` where `a : S` is in a different type `S` with `[SMulZeroClass S R]`. --- - [x] depends on: #25237 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta merge-conflict	17/5	Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	60-58896 1 month ago	60-58896 1 month ago	38-26044 38 days
17145	Command-Master author:Command-Master	feat(Archive/Ioi/Ioi2024Q2): a proof of the solution of question 2 from IOI 2024.	--- - [x] depends on: #17189 - [x] depends on: #17190 - [x] depends on: #17191 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import IMO merge-conflict WIP	1013/1	Archive.lean,Archive/Ioi/Ioi2024Q2.lean,Mathlib.lean,Mathlib/Combinatorics/Orbits.lean,Mathlib/Data/List/SplitLengths.lean,Mathlib/Data/List/Transpose.lean,Mathlib/Data/List/Zip.lean,Mathlib/Data/Vector/Basic.lean,Mathlib/Data/Vector/Defs.lean,Mathlib/Data/Vector/MapLemmas.lean,Mathlib/Data/Vector/Transpose.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/Logic/Function/Iterate.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Partition/Finpartition.lean	15	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	60-58856 1 month ago	60-58856 1 month ago	0-0 0 seconds
14137	mattrobball author:mattrobball	chore(Algebra.Basic): postpone importing algebra instances for `Nat`, `Int`, and `Rat`	This should help typeclass synthesis by avoiding these instances unless absolutely necessary. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	678/356	Counterexamples/Pseudoelement.lean,Mathlib.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom/Basic.lean,Mathlib/Algebra/Algebra/Hom/Int.lean,Mathlib/Algebra/Algebra/Hom/Nat.lean,Mathlib/Algebra/Algebra/Hom/Rat.lean,Mathlib/Algebra/Algebra/Int.lean,Mathlib/Algebra/Algebra/Nat.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Rat.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Int.lean,Mathlib/Algebra/Algebra/Subalgebra/Nat.lean,Mathlib/Algebra/Algebra/Subalgebra/Unitization.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Group/AddChar.lean,Mathlib/Algebra/Module/Bimodule.lean,Mathlib/Algebra/Module/Zlattice/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MvPolynomial/Counit.lean,Mathlib/Algebra/MvPolynomial/NatInt.lean,Mathlib/Algebra/MvPolynomial/Supported.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/DenomsClearable.lean,Mathlib/Algebra/Polynomial/Int.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Analysis/NormedSpace/Basic.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/Data/Complex/Module.lean,Mathlib/Data/Real/Irrational.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/LinearAlgebra/Matrix/Adjugate.lean,Mathlib/LinearAlgebra/Prod.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleAbs.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/RingTheory/Adjoin/Basic.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Adjoin/NatInt.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/RingTheory/IntegralClosure.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Localization/FractionRingInt.lean,Mathlib/RingTheory/Localization/Int.lean,Mathlib/RingTheory/Localization/Nat.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean,Mathlib/RingTheory/PowerSeries/WellKnown.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/WittVector/MulCoeff.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Instances/Real.lean,test/infer_instance.lean,test/instance_diamonds.lean	64	7	['fpvandoorn', 'github-actions', 'grunweg', 'leanprover-bot', 'mattrobball']	nobody	60-58852 1 month ago	60-58852 1 month ago	0-0 0 seconds
11632	mattrobball author:mattrobball	chore(Group/RingTheory.Congruence): make `Quotient`'s reducible	These are essentially wrappers and should not expose any data when made reducible. Their use in constructing typeclass instances makes reducible transparency desirable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory merge-conflict	16/35	Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/RingTheory/Congruence/Basic.lean	2	14	['eric-wieser', 'fpvandoorn', 'github-actions', 'grunweg', 'kmill', 'leanprover-bot', 'mattrobball']	nobody	60-58843 1 month ago	60-58843 1 month ago	2-10495 2 days
3171	eric-wieser author:eric-wieser	refactor: make the algebra hierarchy use flat structures	By introducing a `FlatHack` base class and using it as the first parent of every algebra typeclass, it causes the typeclasses to all overlap and so we emulate flat structures. Most of the pain here comes from `to_additive` not generating any of the ancestor projections properly; this was already a bug present for `n + 1` parents, but now the `1` is taken up This is one workaround for leanprover/lean4#2074: don't let the eta-diamonds appear in the first place. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	328/240	.github/workflows/build.yml,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Category/GroupCat/Basic.lean,Mathlib/Algebra/Category/GroupCat/EquivalenceGroupAddGroup.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/GroupPower/Lemmas.lean,Mathlib/Algebra/Hom/Group.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Module.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Quandle.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/CategoryTheory/Endomorphism.lean,Mathlib/CategoryTheory/Preadditive/Basic.lean,Mathlib/CategoryTheory/Preadditive/SingleObj.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Int/LeastGreatest.lean,Mathlib/Data/Int/Order/Basic.lean,Mathlib/Data/Int/Order/Lemmas.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/Data/Real/CauSeqCompletion.lean,Mathlib/Data/ZMod/Defs.lean,Mathlib/LinearAlgebra/AffineSpace/Ordered.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/RingTheory/Ideal/Quotient.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Ring/Basic.lean	42	14	['eric-wieser', 'gebner', 'harahu']	nobody	60-58838 1 month ago	60-58838 1 month ago	0-0 0 seconds
27643	ADedecker author:ADedecker	Ad bdd unif conv	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	111/26	Mathlib/Analysis/LocallyConvex/Bounded.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/UniformConvergence.lean,Mathlib/Topology/Bornology/Absorbs.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	60-37615 1 month ago	60-37615 1 month ago	0-0 0 seconds
26385	jjdishere author:jjdishere	feat(RingTheory/Perfectoid): define integral perfectoid rings	This PR continues the work from #22331. Original PR: https://github.com/leanprover-community/mathlib4/pull/22331	t-ring-theory merge-conflict WIP	1081/15	Mathlib.lean,Mathlib/Algebra/Ring/Aut.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/PowTransition.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Perfectoid/BDeRham.lean,Mathlib/RingTheory/Perfectoid/FontaineTheta.lean,Mathlib/RingTheory/Perfectoid/IntergalPerfectoid.lean,Mathlib/RingTheory/Perfectoid/Untilt.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/RingTheory/WittVector/Complete.lean,Mathlib/RingTheory/WittVector/TeichmullerSeries.lean,docs/references.bib	16	3	['github-actions', 'jjdishere', 'leanprover-community-bot-assistant']	nobody	59-61323 1 month ago	59-61324 1 month ago	0-79 1 minute
22898	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/TensorProduct/DirectLimit/FG): direct limit of finitely generated submodules and tensor product	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict WIP	399/0	Mathlib.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/FG.lean	5	9	['AntoineChambert-Loir', 'alreadydone', 'github-actions', 'leanprover-community-bot-assistant']	nobody	59-60983 1 month ago	59-60983 1 month ago	11-9349 11 days
21255	chrisflav author:chrisflav	feat(RingTheory/Smooth): smooth is equivalent to locally standard smooth	This is only a container to not lose the branch name. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	1740/11	Mathlib.lean,Mathlib/RingTheory/Kaehler/Localization.lean,Mathlib/RingTheory/Presentation.lean,Mathlib/RingTheory/Smooth/FreeKaehler.lean,Mathlib/RingTheory/Smooth/StandardSmoothCotangent.lean,Mathlib/RingTheory/Smooth/StandardSmoothSmooth.lean	6	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	59-60946 1 month ago	59-60946 1 month ago	0-0 0 seconds
20431	erdOne author:erdOne	feat(RingTheory/AdicCompletion): monotonicity of adic-completeness	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict awaiting-author	206/16	Mathlib.lean,Mathlib/Algebra/Module/Submodule/Defs.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Mono.lean,Mathlib/RingTheory/Finiteness/Ideal.lean	7	13	['chrisflav', 'erdOne', 'github-actions']	nobody	59-60939 1 month ago	59-60939 1 month ago	35-86379 35 days
20424	erdOne author:erdOne	feat(RingTheory): evaluation of power series	--- - [ ] depends on: #20425 - [x] depends on: #20426 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	425/8	Mathlib.lean,Mathlib/RingTheory/AdicCompletion/Noetherian.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Eval.lean,Mathlib/RingTheory/PowerSeries/Trunc.lean	6	11	['AntoineChambert-Loir', 'alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	59-60932 1 month ago	59-60932 1 month ago	0-3944 1 hour
19596	Command-Master author:Command-Master	feat(RingTheory/Valuation/PrimeMultiplicity): define `WithTop ℤ`-valued prime multiplicity on a fraction field	Moves: - `multiplicity_addValuation` -> `AddValuation.multiplicity` - `multiplicity_addValuation_apply` -> `AddValuation.multiplicity_apply` --- - [x] depends on: #19149 - [x] depends on: #18786 - [x] depends on: #19122 - [x] depends on: #18954 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import merge-conflict awaiting-author	101/37	Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/Valuation/PrimeMultiplicity.lean	3	11	['ChrisHughes24', 'Command-Master', 'Vierkantor', 'faenuccio', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	59-60924 1 month ago	59-60924 1 month ago	8-2214 8 days
18646	jxjwan author:jxjwan	feat(RingTheory): isotypic components	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor merge-conflict	308/0	Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/RingTheory/Isotypic.lean,Mathlib/RingTheory/SimpleModule.lean	3	1	['github-actions']	nobody	59-60917 1 month ago	59-60917 1 month ago	20-16585 20 days
17246	pechersky author:pechersky	feat(RingTheory/PrimaryDecomposition): PIR of Noetherian under jacobson condition	--- - [x] depends on: #17634 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict awaiting-author	653/1	Mathlib.lean,Mathlib/NumberTheory/KummerDedekind.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/PrimaryDecomposition.lean,docs/references.bib	8	8	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot']	erdOne assignee:erdOne	59-60911 1 month ago	59-60911 1 month ago	13-7138 13 days
12744	chrisflav author:chrisflav	feat(RingTheory/Smooth): Noetherian ring of definition	We show that given a smooth `A`-algebra `B`, there exists a subring `A₀` of `A` of finite type over `ℤ` and a smooth `A₀`-algebra `B₀` such that `B = A ⊗[A₀] B₀`. A reference is https://stacks.math.columbia.edu/tag/00TP. This is also a test case for the ring of definition API. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	1212/0	Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,Mathlib/RingTheory/RingOfDefinition/BaseChange.lean,Mathlib/RingTheory/RingOfDefinition/Basic.lean,Mathlib/RingTheory/RingOfDefinition/Relations.lean,Mathlib/RingTheory/Smooth/Descent.lean,Mathlib/ToBeMoved.lean	10	0	[]	nobody	59-60886 1 month ago	59-60886 1 month ago	0-0 0 seconds
12743	chrisflav author:chrisflav	feat(RingTheory/RingOfDefinition): basic API	Given a finitely presented algebra `A` over a ring `R`, we may descend to a Noetherian subring `R₀` of `R` and a model of `A` over `R₀`. In this PR we provide basic API for working with polynomial rings over subrings. In particular we provide infrastructure for producing `R₀` and descending polynomials in `R` to polynomials in `R₀` given containment of the coefficients. Notation: `R` is a ring, `R₀` a subring, `p : MvPolynomial ι R` and `s : Set (MvPolynomial ι R)`. ## Main definitions For producing subrings containing a set of polynomials of interest, we provide the following: - `HasCoefficients p R₀`: typeclass expressing that the coefficients of `p` are contained in `R₀`. - `core s`: adjoin the coefficients of a set of polynomials `s` to `ℤ`. - `adjoinCoefficients s R₀`: adjoin the coefficients of a set of polynomials `s` to `R₀`. - `repr p R₀`: Given `[HasCoefficients p R₀]` and a polynomial `p`, this is the representative of `p` as a polynomial over `R₀`. Instances for `HasCoefficients` are provided to ensure that the following facts are automatically inferred: - the coefficients of any polynomial in `s` are contained in `core s`. - if the coefficients of `p` are in `R₀` and we adjoin the coefficients of `s`, then the coefficients of `p` are also in `adjoinCoefficients s R₀`. Now, given a (finitely) presented `R` algebra, expressed through an ideal `I : Ideal R`, a `Model` of `I` is a structure containing - a set `s` of generators of `I` - a subring `R₀` - a proof that the coefficients of `s` are contained in `R₀` Given such a model `M`, we expose: - `M.s₀`: the intersection of `s` with `MvPolynomial ι R₀`. Informally this is simply `s`. - `M.I₀`: the ideal generated by `M.s₀` - `M.A₀`: the quotient `MvPolynomial ι M.R₀ ⧸ MvPolynomial ι M.I₀` In `RingOfDefinition/BaseChange` we show that `R ⊗[R₀] M.A₀` is `R`-isomorphic to `MvPolynomial ι R ⧸ I` (this is done in a more general setting and then specialized to this situation). Since `M.I₀` is not equal to `I` intersected with `R₀`, more technical difficulties arise. To work around these, we introduce - `Relation A`: For an arbitrary `A : Set R`, this is simply `MvPolynomial A R`. In the following we are particularly interested in the case where `A = s = Set (MvPolynomial ι R)` is a set of generators of `I`. An equation `x = y` in `MvPolynomial ι R ⧸ I` can be expressed as `x - y ∈ I`. In this case there exists a `r : Relation s` such that `eval r = x - y`. Here `eval` is a shortcut for `MvPolynomial.eval Subtype.val`, i.e. we evaluate the formal expression `r` in the ring `MvPolynomial ι R`. To preserve this equation in `MvPolynomial ι R₀ ⧸ I₀`, we need to adjoin the coefficients of `r` to `R₀`. For this a similar API is provided, in particular: - `HasRelation r R₀`: a typeclass expressing that the coefficients of `r` are contained in `R₀`. - `adjoinRelations rs R₀`: adjoin the coefficients of a set of relations to `R₀`. - `repr r M`: Given `[HasRelation r M.R₀]`, this is the representative of `r` over `R₀`, i.e. an element of `Relation M.s₀` that is mapped to `r` under the canonical map `Relation M.s₀ → Relation M.s`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	797/0	Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,Mathlib/RingTheory/RingOfDefinition/BaseChange.lean,Mathlib/RingTheory/RingOfDefinition/Basic.lean	7	0	[]	nobody	59-60878 1 month ago	59-60878 1 month ago	0-0 0 seconds
12695	chrisflav author:chrisflav	feat(RingTheory/Smooth): smooth morphisms are flat	We show that smooth ring homomorphisms are flat. The strategy for a smooth `A`-algebra `B` is the following: - first we find a model of `B` over a Noetherian base ring - if `A` is Noetherian, we identify `B` as a retract of the adic completion of a polynomial ring over `A`, which is flat This is the summary PR which will be split in several parts. Co-authored-by: Judith Ludwig --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	2767/1	Mathlib.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/LinearAlgebra/SModEq.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/AsTensorProduct.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Exactness.lean,Mathlib/RingTheory/AdicCompletion/Functoriality.lean,Mathlib/RingTheory/RingOfDefinition.lean,Mathlib/RingTheory/RingOfDefinition/RingModel.lean,Mathlib/RingTheory/RingOfDefinition/Utils.lean,Mathlib/RingTheory/RingOfDefinitionIdeal.lean,Mathlib/RingTheory/Smooth/Descent.lean,Mathlib/RingTheory/Smooth/Flat.lean	16	0	[]	nobody	59-60870 1 month ago	59-60870 1 month ago	0-0 0 seconds
12294	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Mathlib.RingTheory.TensorProduct.Polynomial) : tensor product of a (univariate) polynomial ring	We define a linear equivalence of a polynomial ring by a module with a finsupp type. We prove lemmas that allow to manipulate this equivalence. This is adapted from the content of #12293, but since `Polynomial` is a structure containing a `Finsupp`, these functions can't be applied directly to `Polynomial`. Some linear equivs need to be added to mathlib for that. --- - [x] depends on: #12293 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict WIP	484/0	Mathlib.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/RingTheory/TensorProduct/Polynomial.lean	7	1	['leanprover-community-mathlib4-bot']	nobody	59-60863 1 month ago	59-60863 1 month ago	0-79429 22 hours
21474	erdOne author:erdOne	feat(RingTheory): replace `Ring.DimensionLEOne` with `Ring.KrullDimLE`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import merge-conflict	285/170	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Basic.lean,Mathlib/RingTheory/DedekindDomain/Dvr.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/DiscreteValuationRing/TFAE.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/KrullDimension/Localization.lean,Mathlib/RingTheory/KrullDimension/Polynomial.lean,Mathlib/RingTheory/KrullDimension/Quotient.lean,Mathlib/RingTheory/LocalRing/ResidueField/Basic.lean,Mathlib/RingTheory/Nilpotent/End.lean,Mathlib/RingTheory/Nilpotent/Lemmas.lean,Mathlib/RingTheory/PID/Quotient.lean,Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/Spectrum/Maximal/Localization.lean	16	1	['github-actions']	nobody	59-60855 1 month ago	59-60855 1 month ago	2-7106 2 days
12292	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Mathlib.RingTheory.TensorProduct.MonoidAlgebra) : tensor product of a monoid algebra	* `MonoidAlgebra.rTensorAlgEquiv`: the tensor product of `MonoidAlgebra M α` with `N` is `R`-linearly equivalent to `MonoidAlgebra (M ⊗[R] N) α` * `MonoidAlgebra.scalarRTensorAlgEquiv`, the tensor product of `MonoidAlgebra R α` with `N` is `R`-linearly equivalent to `MonoidAlgebra N α` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict WIP	447/0	Mathlib.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/RingTheory/TensorProduct/MonoidAlgebra.lean	3	23	['AntoineChambert-Loir', 'eric-wieser', 'github-actions']	nobody	59-60832 1 month ago	59-60832 1 month ago	6-28213 6 days
11575	ScottCarnahan author:ScottCarnahan	feat (RingTheory/HahnSeries/Addition): Lemmas on leading terms	The main result of this PR is that when the exponent set is linearly ordered, then removing the leading term in a Hahn series `x` yields a Hahn series `y` that is, if nonzero, of strictly higher order. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict WIP	39/0	Mathlib/RingTheory/HahnSeries/Addition.lean	1	0	[]	nobody	59-60825 1 month ago	59-60825 1 month ago	10-75677 10 days
9820	jjaassoonn author:jjaassoonn	feat(RingTheory/GradedAlgebra/HomogeneousIdeal): generalize to homogeneous submodule	The definitions, constructions and theorems in `HomogeneousIdeal.lean` are generalized to a homogeneous submodules. So say $R$ is a ring and $M \cong \bigoplus_{i} M_i$ is an $R$-module. Then a homogeneous $R$-submodule of $M$ is an $R$-submodule $N$ such that for all $i$ and $n \in N$, $n_i \in N$. Note that this notion doesn't actually require $R$ to be graded and $M$ is a graded module. But for more interesting lemmas, we do need that $M$ is graded $R$-module. We bake the fact $R$ is graded into the definition of homogeneous submodule, otherwise, `CompleteLattice HomogeneousSubmodule` cannot find the order of synthesis (the proof depends on that $R$ is graded) All definitions/constructions/theorems have a copy for ideals as well, this is to make sure dot notation still works. The motivation of this generalization is graded quotient module --- - [ ] depends on:#18728 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	516/185	Mathlib/Algebra/Module/GradedModule.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,scripts/nolints_prime_decls.txt	7	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	59-60818 1 month ago	59-60818 1 month ago	172-57747 172 days
9339	FMLJohn author:FMLJohn	feat (RingTheory/GradedAlgebra/HomogeneousIdeal): given a finitely generated homogeneous ideal of a graded semiring, construct a finite spanning set for the ideal which only contains homogeneous elements	--- - [ ] depends on: #8187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	402/4	Mathlib.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Module/GradeZeroModule.lean,Mathlib/RingTheory/Finiteness.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousIdeal.lean,Mathlib/RingTheory/GradedAlgebra/Noetherian.lean	8	11	['FMLJohn', 'github-actions', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	59-60811 1 month ago	59-60811 1 month ago	0-0 0 seconds
8195	newell author:newell	feat: add a group presentation of the `DihedralGroup n`	Add group presentation $\< a, b\ \|\ a ^ 2 = 1, b ^ 2 = 1, (a * b) ^ n = 1 \>$ for `DihedralGroup n`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory merge-conflict WIP	206/2	Mathlib/GroupTheory/PresentedGroup.lean,Mathlib/GroupTheory/SpecificGroups/Dihedral.lean	2	6	['kbuzzard', 'newell']	nobody	59-60654 1 month ago	59-60654 1 month ago	0-0 0 seconds
11212	shuxuezhuyi author:shuxuezhuyi	feat(GroupTheory/GroupAction): instance `MulAction (β ⧸ H) α`	We instance this naturally from `MulAction β α` when `H` is a normal subgroup and acts trivially on `α`. We also instance `IsometricSMul (M ⧸ N) X` in this way. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory large-import merge-conflict awaiting-author	53/1	Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean	2	6	['YaelDillies', 'github-actions', 'grunweg', 'urkud']	eric-wieser assignee:eric-wieser	59-60647 1 month ago	59-60647 1 month ago	193-70524 193 days
27886	alreadydone author:alreadydone	feat(Algebra): (Mv)Polynomial.X is irreducible assuming NoZeroDivisors	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	178/66	Archive/Examples/Eisenstein.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Domain.lean,Mathlib/Algebra/Polynomial/Degree/Units.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/RingTheory/MvPolynomial/Groebner.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder/DegLex.lean,Mathlib/RingTheory/Polynomial/Content.lean,Mathlib/RingTheory/Polynomial/Eisenstein/Criterion.lean	13	3	['alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	59-58382 1 month ago	59-58383 1 month ago	1-36700 1 day
26200	adomani author:adomani	fix: add label when landrun fails	Adds the `permission-denied` label on PRs that get blocked by landrun. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict	68/8	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	59-9849 1 month ago	59-9849 1 month ago	46-52210 46 days
17469	joelriou author:joelriou	feat(Algebra/ModuleCat/Differentials/Presheaf): the presheaf of relative differentials	Given a functor `F : C ⥤ D`, presheaves of commutative rings `S`, `R` and a morphism `φ : S ⟶ F.op ⋙ R`, we show that derivations relative to `φ` are representable by a presheaf of `R`-modules. This is obtained by reducing to the case of absolute differentials. The construction shall allow to deduce the presheaf version of the cokernel sequence $$f^\star \Omega_{Y/S} ⟶ \Omega_{X/S} ⟶ \Omega_{X/Y} ⟶ 0$$ when `f : X ⟶ Y` and `g : Y ⟶ S` are morphisms of schemes. --- - [x] depends on: #17366 - [x] depends on: #19507 - [x] depends on: #17388 - [x] depends on: #16755 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebraic-geometry t-category-theory merge-conflict WIP	391/10	Mathlib/Algebra/Category/ModuleCat/Differentials/Presheaf.lean	1	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	59-5198 1 month ago	59-5199 1 month ago	0-530 8 minutes
18254	callesonne author:callesonne	feat(Bicategory/Modification/Pseudo): define modifications between strong natural transformations of pseudofunctors	This PR adds modifications between strong natural transformations of pseudofunctors. At the same time, it improves the existing code on modifications between oplax natural tranformations of oplax functors (by removing some simp lemmas). --- - [x] depends on: #18250 - [x] depends on: #18252 - [x] depends on: #18253 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict awaiting-author	335/55	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Modification/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean	5	26	['callesonne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier', 'yuma-mizuno']	nobody	59-5197 1 month ago	59-5198 1 month ago	36-5602 36 days
24620	mattrobball author:mattrobball	chore(CategoryTheory.Basic): change `aesop_cat`'s intro transparency level to `instances` from `default`	Let's see if this helps much. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	93/88	Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Algebra/Homology/ShortComplex/Preadditive.lean,Mathlib/Algebra/Homology/Single.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/ModuleEmbedding/GabrielPopescu.lean,Mathlib/CategoryTheory/Adjunction/Comma.lean,Mathlib/CategoryTheory/Adjunction/Mates.lean,Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/CategoryTheory/Category/GaloisConnection.lean,Mathlib/CategoryTheory/CodiscreteCategory.lean,Mathlib/CategoryTheory/CommSq.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Discrete/Basic.lean,Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/FintypeCat.lean,Mathlib/CategoryTheory/Functor/EpiMono.lean,Mathlib/CategoryTheory/Functor/FullyFaithful.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/HomCongr.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/LiftingProperties/Adjunction.lean,Mathlib/CategoryTheory/Limits/ConeCategory.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/IsLimit.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Terminal.lean,Mathlib/CategoryTheory/Limits/Shapes/ZeroMorphisms.lean,Mathlib/CategoryTheory/MorphismProperty/OverAdjunction.lean,Mathlib/CategoryTheory/Preadditive/Opposite.lean,Mathlib/CategoryTheory/SingleObj.lean,Mathlib/Topology/Sheaves/Sheaf.lean	31	8	['github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'mattrobball']	nobody	58-82402 1 month ago	58-82402 1 month ago	0-0 0 seconds
25288	robertmaxton42 author:robertmaxton42	feat(CategoryTheory): generalize `Discrete` to arbitrary morphism levels	Using an unused `let`, add an 'anchor' to the definition of `Discrete`, allowing it to carry a second universe level that is then used to permit discrete categories to live in any `Cat.{v, u}`. (This trick was borrowed from the code of `ULiftHom`.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	38/32	Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Discrete/Basic.lean,Mathlib/CategoryTheory/IsConnected.lean	3	3	['github-actions', 'joelriou', 'mathlib4-merge-conflict-bot']	nobody	58-80957 1 month ago	58-80958 1 month ago	0-0 0 seconds
27709	kckennylau author:kckennylau	chore: fix links	--- See https://github.com/leanprover-community/mathlib4/pull/27545#discussion_r2238206933 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	269/256	Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/GCDMonoid/Multiset.lean,Mathlib/Algebra/Group/Even.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Module/Hom.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Algebra/Order/Field/Pi.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Order/Monovary.lean,Mathlib/Algebra/Order/Ring/Unbundled/Basic.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Ring/Basic.lean,Mathlib/Algebra/Squarefree/Basic.lean,Mathlib/Algebra/Star/BigOperators.lean,Mathlib/Algebra/Star/Free.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/Analysis/Analytic/RadiusLiminf.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Calculus/Conformal/NormedSpace.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Calculus/Deriv/Linear.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Complex/Circle.lean,Mathlib/Analysis/Complex/OperatorNorm.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Jensen.lean,Mathlib/Analysis/Meromorphic/IsolatedZeros.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/EulerSineProd.lean,Mathlib/CategoryTheory/Abelian/Opposite.lean,Mathlib/CategoryTheory/Adjunction/Opposites.lean,Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Closed/Monoidal.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean,Mathlib/CategoryTheory/Localization/Equivalence.lean,Mathlib/CategoryTheory/Localization/Trifunctor.lean,Mathlib/CategoryTheory/ObjectProperty/Basic.lean,Mathlib/CategoryTheory/Sites/Coherent/SheafComparison.lean,Mathlib/Combinatorics/Colex.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/Pigeonhole.lean,Mathlib/Combinatorics/Quiver/Covering.lean,Mathlib/Combinatorics/Quiver/Path.lean,Mathlib/Control/LawfulFix.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/Fin/Pigeonhole.lean,Mathlib/Data/FinEnum/Option.lean,Mathlib/Data/Finset/Filter.lean,Mathlib/Data/Finsupp/Fin.lean,Mathlib/Data/Fintype/BigOperators.lean,Mathlib/Data/Fintype/Defs.lean,Mathlib/Data/Int/Basic.lean,Mathlib/Data/Int/Cast/Basic.lean,Mathlib/Data/Int/Cast/Lemmas.lean,Mathlib/Data/Int/Lemmas.lean,Mathlib/Data/Int/Order/Lemmas.lean,Mathlib/Data/Int/Range.lean,Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Dedup.lean,Mathlib/Data/List/Destutter.lean,Mathlib/Data/List/Forall2.lean,Mathlib/Data/List/Lattice.lean,Mathlib/Data/List/Lemmas.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/Pairwise.lean,Mathlib/Data/List/Permutation.lean,Mathlib/Data/List/ProdSigma.lean,Mathlib/Data/List/Sections.lean,Mathlib/Data/List/Sublists.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matroid/Minor/Restrict.lean,Mathlib/Data/Multiset/FinsetOps.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Cast/WithTop.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/LCM.lean,Mathlib/Data/PSigma/Order.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Data/Rat/Encodable.lean,Mathlib/Data/Set/Card.lean,Mathlib/Data/Set/Defs.lean,Mathlib/Data/Set/Finite/Basic.lean,Mathlib/Data/Set/Finite/Lattice.lean,Mathlib/Data/Set/Functor.lean,Mathlib/Data/Set/Notation.lean,Mathlib/Data/Set/Pairwise/Basic.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/Sigma/Lex.lean	157	87	['github-actions', 'kbuzzard', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	58-79168 1 month ago	58-79168 1 month ago	0-9 9 seconds
10345	newell author:newell	feat(Algebra.Module.Zlattice): Add Voronoi Domain	Adds the definition for a Voronoi Domain in regards to the $\mathbb{Z}$-lattice: $$C := \lbrace\mathbf{w} \in \mathbb{V}^n\ :\ \|\mathbf{w}\| \leq \|\mathbf{w} - \mathbf{v}\|\ \text{for all}\ \mathbf{v} \in \mathbf{L} \rbrace$$ where $\mathbf{L}\$ is the $\mathbb{Z}$-lattice. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	17/0	Mathlib/Algebra/Module/Zlattice.lean	1	3	['alreadydone', 'newell']	nobody	58-10656 1 month ago	58-10656 1 month ago	0-0 0 seconds
27286	edegeltje author:edegeltje	refactor(OrderDual): make a one-field structure and remove defeq abuse	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict WIP	683/426	Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Order/Group/Action/Synonym.lean,Mathlib/Algebra/Order/Group/Synonym.lean,Mathlib/Algebra/Order/GroupWithZero/Action/Synonym.lean,Mathlib/Algebra/Order/GroupWithZero/Synonym.lean,Mathlib/Algebra/Order/Module/Synonym.lean,Mathlib/Algebra/Order/Monoid/Unbundled/OrderDual.lean,Mathlib/Algebra/Order/Ring/Synonym.lean,Mathlib/Data/Nat/Cast/Synonym.lean,Mathlib/Logic/Function/Iterate.lean,Mathlib/Order/Basic.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/BoundedOrder/Lattice.lean,Mathlib/Order/BoundedOrder/Monotone.lean,Mathlib/Order/Circular.lean,Mathlib/Order/Compare.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/GaloisConnection/Defs.lean,Mathlib/Order/Iterate.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/Max.lean,Mathlib/Order/MinMax.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/Synonym.lean,Mathlib/Order/WithBot.lean	26	2	['alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	58-10378 1 month ago	58-10379 1 month ago	0-0 0 seconds
27378	peakpoint author:peakpoint	refactor(Geometry/Euclidean/Projection): redefine projection and reflection for affine subspaces	This PR continues the work from #25578. Original PR: https://github.com/leanprover-community/mathlib4/pull/25578	new-contributor t-euclidean-geometry merge-conflict	316/317	Mathlib/Analysis/Normed/Affine/ContinuousAffineMap.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Geometry/Euclidean/Circumcenter.lean,Mathlib/Geometry/Euclidean/Projection.lean	4	7	['github-actions', 'jsm28', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'peakpoint']	nobody	56-35059 1 month ago	56-35060 1 month ago	15-31164 15 days
20671	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Analysis/Asymptotics/SpecificAsymptotics): Proving that 𝛔ₖ(n) = O(nᵏ⁺¹)	This PR proves a result about the $\sigma_k(n)$ arithmetic function, namely, that it is $O\left(n^{k+1}\right)$. Main theorem: `theorem sigma_asymptotic (k : ℕ) : (fun n ↦ (σ k n : ℝ)) =O[atTop] (fun n ↦ (n ^ (k + 1) : ℝ))` This result was proved as part of the sphere packing project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-number-theory merge-conflict awaiting-author	29/0	Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean	1	3	['b-mehta', 'github-actions', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	54-64458 1 month ago	54-64458 1 month ago	9-59130 9 days
20267	joelriou author:joelriou	feat(CategoryTheory): comma categories are accessible	--- (I shall probably not work on this PR in the near future.) - [ ] depends on: #19937 - [ ] depends on: #19945 - [ ] depends on: #19959 - [ ] depends on: #20005 - [ ] depends on: #19955 - [x] depends on: #20263 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict awaiting-author WIP	1513/7	Mathlib.lean,Mathlib/CategoryTheory/Comma/Arrow.lean,Mathlib/CategoryTheory/Comma/CardinalArrow.lean,Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/Limits/Comma.lean,Mathlib/CategoryTheory/Limits/TypesFiltered.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/Comma.lean,Mathlib/CategoryTheory/Presentable/IsCardinalFiltered.lean,Mathlib/CategoryTheory/Presentable/Limits.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/CategoryTheory/Presentable/ParallelMaps.lean,Mathlib/SetTheory/Cardinal/HasCardinalLT.lean,docs/references.bib	15	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	54-57425 1 month ago	54-57426 1 month ago	0-0 0 seconds
27451	kckennylau author:kckennylau	feat(RingTheory/Valuation): define ball, closed ball, and sphere	From the 2025 Local Class Field Theory Workshop. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	27/0	Mathlib/RingTheory/Valuation/Basic.lean	1	13	['JovanGerb', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky', 'wwylele']	nobody	53-42352 1 month ago	53-42353 1 month ago	17-52359 17 days
27987	kckennylau author:kckennylau	feat(RingTheory/Valuation): define ball, closed ball, and sphere	--- The pullback PR of #26827 and #27451. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import merge-conflict	73/0	Mathlib/RingTheory/Valuation/Basic.lean	1	4	['JovanGerb', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	53-41981 1 month ago	53-41982 1 month ago	6-6455 6 days
24862	grunweg author:grunweg	feat(LocallyIntegrable): generalise more to enorms	--- Note: github's diff is very confused; it includes changes which very clearly are already on the master branch. I'll see which of the remaining changes after the dependencies have landed is already polished enough. - [x] depends on: #24352 - [x] depends on: #27457 (this half is settled already) - [ ] open question: filter lemmas; IsBoundedUnder is not the right condition as-is; need to think (or just not generalise) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson t-measure-probability merge-conflict WIP	171/88	Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	53-35702 1 month ago	53-35703 1 month ago	0-1 1 second
25978	Bergschaf author:Bergschaf	feat(Order/Sublocale): Open Sublocales	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25089	t-order merge-conflict	377/8	Mathlib.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/Nucleus.lean,Mathlib/Order/Sublocale.lean,Mathlib/Order/Synonym.lean,docs/references.bib	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	52-73543 1 month ago	52-73544 1 month ago	0-1908 31 minutes
27197	alreadydone author:alreadydone	feat(Topology): `IsCoveringMapOn` open set	--- - [x] depends on: #25044 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict WIP	282/28	Mathlib/Topology/Covering.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Maps/Basic.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	52-49252 1 month ago	52-49957 1 month ago	0-0 0 seconds
25133	erdOne author:erdOne	feat(Tactic/NormNum): support positive characteristic	Co-authored-by: Heather Macbeth --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta merge-conflict WIP	250/39	Mathlib/Tactic/NormNum/CharP.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/NormNum/Eq.lean,Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/NormNum/Test.lean	5	5	['erdOne', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	51-57141 1 month ago	51-57142 1 month ago	0-0 0 seconds
27003	eric-wieser author:eric-wieser	chore: use `Simp.ResultQ` more often	Also uses `~q` in place of manual `isDefEq` matching. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	18/22	Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/NormNum/Result.lean,Mathlib/Tactic/ReduceModChar.lean	3	7	['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	JovanGerb assignee:JovanGerb	51-56605 1 month ago	51-56606 1 month ago	32-70098 32 days
26374	joelriou author:joelriou	feat(CategoryTheory): existence of right derived functors using derivability structures	In this PR, we formalize an existence theorem for right derived functors which appeared in the article _Structures de dérivabilité_ by Bruno Kahn and Georges Maltsiniotis, Adv. Math. 218 (2008). --- - [ ] depends on: #26036 This PR continues the work from #22508. Original PR: https://github.com/leanprover-community/mathlib4/pull/22508	t-category-theory merge-conflict WIP	326/2	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/PointwiseRightDerived.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/Basic.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/PointwiseRightDerived.lean	6	4	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	51-47439 1 month ago	51-47439 1 month ago	0-53 53 seconds
25483	VTrelat author:VTrelat	chore(Data/Set/Prod, SetTheory/ZFC/Basic): add theorem prod_subset_of_prod and extend ZFC model	Required by @eric-wieser in #24281 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict	103/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean	2	10	['Ruben-VandeVelde', 'VTrelat', 'github-actions', 'leanprover-community-bot-assistant']	nobody	51-46248 1 month ago	90-80555 2 months ago	29-56208 29 days
16150	urkud author:urkud	feat(Dynamics): Hopf decomposition	Prove Hopf decomposition. - [ ] rewrite to work with the saturations right away, not with a wandering set. - [ ] generalize to an action of a countable group, use fundamental domains. --- - [ ] depends on: #16146 - [ ] depends on: #16126 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics t-measure-probability merge-conflict	212/0	Mathlib.lean,Mathlib/Dynamics/Ergodic/Dissipative.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean	3	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	51-24577 1 month ago	51-24578 1 month ago	0-0 0 seconds
25401	digama0 author:digama0	feat(Util): SuppressSorry option	See also leanprover/lean4#8611 and [#lean4 > Silent sorry @ 💬](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Silent.20sorry/near/503537964). This is a stop-gap solution while leanprover/lean4#8611 is underway, but it works about as well as any other built in option. Hooking declaration elaborators turns out to be a very powerful technique. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	342/0	Mathlib.lean,Mathlib/Util/CommandElabHook.lean,Mathlib/Util/SuppressSorry.lean,MathlibTest/suppressSorry.lean	4	15	['digama0', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	51-11401 1 month ago	51-11401 1 month ago	71-28549 71 days
26394	winstonyin author:winstonyin	feat: existence of local flows on manifolds	This PR continues the work from #21777. Original PR: https://github.com/leanprover-community/mathlib4/pull/21777 Transfer the existence theorem of local flows on vector spaces to manifolds. The precise statement is: > If a vector field `v` on a manifold `M` is continuously differentiable at an interior point `x₀`, then for a given `t₀` there exists a neighbourhood `u` of `x₀`, a positive `ε`, and `γ : M → ℝ → M` such that `γ x` is an integral curve of `v` on `(t₀ - ε, t₀ + ε)` for all `x ∈ u`. This is powerful because all curves `γ x` (each with initial condition `x ∈ u`) share the same existence time interval `(t₀ - ε, t₀ + ε)`, rather than each curve having its own `ε`. This will allow us to show that $C^1$ vector fields on compact manifolds always have global integral curves / global flows. Any suggestions to shorten the proof or split out useful lemmas are welcome! - [x] depends on: #26392 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict WIP	154/52	Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Order/Filter/Prod.lean	3	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'winstonyin']	nobody	51-10962 1 month ago	51-10963 1 month ago	0-70 1 minute
26446	joelriou author:joelriou	refactor(CategoryTheory): make morphisms in full subcategories a 1-field structure	This PR refactors the definition of morphisms in full subcategories (and induced categories), by making them a 1-field structure. This prevents certain defeq abuse, and improves automation. (The only issue is that this adds an extra layer: `f` sometimes becomes `f.hom`, etc.) --- (This time, I will try to complete this refactor. I very much need this for application to homotopical algebra, where full subcategories of cofibrant/fibrant/bifibrant are used.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	1741/1418	Mathlib/Algebra/Category/CommAlgCat/FiniteType.lean,Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/FGModuleCat/EssentiallySmall.lean,Mathlib/Algebra/Category/Grp/FiniteGrp.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/ModuleCat/Tannaka.lean,Mathlib/Algebra/Homology/LocalCohomology.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/Cover/Open.lean,Mathlib/AlgebraicGeometry/FunctionField.lean,Mathlib/AlgebraicGeometry/GammaSpecAdjunction.lean,Mathlib/AlgebraicGeometry/Gluing.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiSeparated.lean,Mathlib/AlgebraicGeometry/Morphisms/Separated.lean,Mathlib/AlgebraicGeometry/Noetherian.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/AlgebraicGeometry/Spec.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplexCategory/MorphismProperty.lean,Mathlib/AlgebraicTopology/SimplicialNerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/Coskeletal.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/Path.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/ColimCoyoneda.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/EnoughInjectives.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/Subobject.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Adjunction/PartialAdjoint.lean,Mathlib/CategoryTheory/Category/TwoP.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/ConnectedComponents.lean,Mathlib/CategoryTheory/Countable.lean,Mathlib/CategoryTheory/Endomorphism.lean,Mathlib/CategoryTheory/EqToHom.lean,Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/Filtered/Small.lean,Mathlib/CategoryTheory/FinCategory/AsType.lean,Mathlib/CategoryTheory/FintypeCat.lean,Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/CategoryTheory/Galois/Decomposition.lean,Mathlib/CategoryTheory/Galois/Equivalence.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/GaloisObjects.lean,Mathlib/CategoryTheory/Galois/IsFundamentalgroup.lean,Mathlib/CategoryTheory/Galois/Prorepresentability.lean,Mathlib/CategoryTheory/Galois/Topology.lean,Mathlib/CategoryTheory/InducedCategory.lean,Mathlib/CategoryTheory/Limits/ExactFunctor.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/Indization/LocallySmall.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/CategoryTheory/Localization/Construction.lean,Mathlib/CategoryTheory/Localization/LocallySmall.lean,Mathlib/CategoryTheory/Localization/Predicate.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/CommGrp_.lean,Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Internal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Internal/Types/Basic.lean,Mathlib/CategoryTheory/Monoidal/Internal/Types/CommGrp_.lean,Mathlib/CategoryTheory/Monoidal/Internal/Types/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Subcategory.lean,Mathlib/CategoryTheory/MorphismProperty/IsInvertedBy.lean,Mathlib/CategoryTheory/ObjectProperty/FullSubcategory.lean,Mathlib/CategoryTheory/Preadditive/AdditiveFunctor.lean,Mathlib/CategoryTheory/Preadditive/Basic.lean,Mathlib/CategoryTheory/Preadditive/CommGrp_.lean,Mathlib/CategoryTheory/Simple.lean,Mathlib/CategoryTheory/Sites/Coherent/RegularSheaves.lean,Mathlib/CategoryTheory/Sites/EffectiveEpimorphic.lean,Mathlib/CategoryTheory/Sites/Sheaf.lean,Mathlib/CategoryTheory/Sites/SheafHom.lean,Mathlib/CategoryTheory/Sites/SheafOfTypes.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/Comma.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean,Mathlib/CategoryTheory/Subobject/NoetherianObject.lean,Mathlib/CategoryTheory/Subobject/Types.lean,Mathlib/CategoryTheory/Subpresheaf/Subobject.lean,Mathlib/CategoryTheory/Subterminal.lean,Mathlib/CategoryTheory/Topos/Classifier.lean,Mathlib/Condensed/Discrete/Colimit.lean,Mathlib/Condensed/Discrete/LocallyConstant.lean,Mathlib/Condensed/Discrete/Module.lean,Mathlib/Condensed/Light/TopCatAdjunction.lean,Mathlib/Condensed/TopCatAdjunction.lean,Mathlib/Condensed/TopComparison.lean	141	7	['erdOne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'smorel394']	nobody	50-75346 1 month ago	70-1968 2 months ago	0-2 2 seconds
28298	thorimur author:thorimur	chore: dedent `to_additive` docstrings	This PR uses automation to dedent `to_additive` docstrings throughout Mathlib. It does not lint against indentation or in any way enforce indentation standards for future docstrings. The convention was chosen in accordance with the discussion and polls at [this Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Poll.3A.20Indentation.20style.20for.20.60to_additive.60.20docstrings/with/534285603). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip merge-conflict documentation	949/949	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/Grp/FilteredColimits.lean,Mathlib/Algebra/Category/Grp/Limits.lean,Mathlib/Algebra/Category/Grp/Ulift.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/MonCat/Limits.lean,Mathlib/Algebra/Category/Semigrp/Basic.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/Pi.lean,Mathlib/Algebra/Group/Action/Pointwise/Finset.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Embedding.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Equiv/Opposite.lean,Mathlib/Algebra/Group/Even.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Indicator.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/Pi/Units.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Group/Subgroup/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/BigOperators.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/Group/Units/Opposite.lean,Mathlib/Algebra/Notation/Pi/Basic.lean,Mathlib/Algebra/Opposites.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Group/Cone.lean,Mathlib/Algebra/Order/Group/OrderIso.lean,Mathlib/Algebra/Order/Group/Units.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Submonoid.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Monoid/Units.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Regular/Defs.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Fintype/BigOperators.lean,Mathlib/Data/Set/MulAntidiagonal.lean,Mathlib/Data/Set/SMulAntidiagonal.lean,Mathlib/Data/Vector/Basic.lean,Mathlib/Dynamics/Ergodic/Action/OfMinimal.lean,Mathlib/Dynamics/FixedPoints/Prufer.lean,Mathlib/Geometry/Manifold/Algebra/SmoothFunctions.lean,Mathlib/GroupTheory/Complement.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Coprod/Basic.lean,Mathlib/GroupTheory/Coset/Basic.lean,Mathlib/GroupTheory/Divisible.lean,Mathlib/GroupTheory/EckmannHilton.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/FreeGroup/Reduce.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/FixedPoints.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/Primitive.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean	141	10	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'thorimur']	nobody	50-22659 1 month ago	51-10031 1 month ago	0-61617 17 hours
27953	CoolRmal author:CoolRmal	feat(ProbabilityTheory): Conditional Jensen's Inequality	This PR adds conditional Jensen's inequality. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict	526/14	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Separation.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondJensen.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean	5	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	50-20644 1 month ago	50-20645 1 month ago	8-36460 8 days
27759	plp127 author:plp127	chore(FreeAbelianGroup): deprecate multiplication	Deprecate multiplication on `FreeAbelianGroup` in favor of using `MonoidAlgebra`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict label:t-algebra$	176/86	Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/RingTheory/FreeCommRing.lean,Mathlib/RingTheory/FreeRing.lean	5	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	49-64247 1 month ago	49-64248 1 month ago	14-59974 14 days
8102	miguelmarco author:miguelmarco	feat(Tactic): add `unify_denoms` and `collect_signs` tactics	This PR adds four new tactics: - `unify_denoms` tries to put expressions with several divisions in a form with only one division. In the case of fields, it works similarly to `field_simp`, but if the hypothesis about denominators being nonzero are not present, it assumes them, and leaves them as new goals to prove. In that sense, it is an "unsafe" tactic (but can be useful nevertheless, for example when you can't find which exact hypothesis is missing). It also works with expressions of naturals and Euclidean domains, assuming the corresponding hypothesis about the denominators dividing the numerators. - `unify_denoms!` extends `unify_denoms` to work with (in)equalities, assuming also that the denominators, once in normal form, are positive. - `collect_signs` works similarly with expressions using sums and substractions: it tries to put them in a form of one sum minus other sum. In the case of working with naturals, it assumes that we never substract a bigger number from a smaller one. Both are implemented essentially as a macro that combines several rewriting rules. Some new lemmas with the corresponding rules are added. ---	new-contributor t-meta merge-conflict please-adopt modifies-tactic-syntax good first issue	407/0	Mathlib.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CollectSigns.lean,Mathlib/Tactic/UnifyDenoms.lean,MathlibTest/unify_denoms.lean,scripts/noshake.json	7	55	['Paul-Lez', 'YaelDillies', 'github-actions', 'joneugster', 'kbuzzard', 'mathlib4-merge-conflict-bot', 'miguelmarco']	nobody	49-61716 1 month ago	49-71472 1 month ago	22-16933 22 days
14203	dagurtomas author:dagurtomas	feat(Algebra/ModuleCat): descent data	Co-authored-by: Jack McKoen Co-authored-by: Christian Merten Co-authored-by: Joël Riou Co-authored-by: Adam Topaz --- - [ ] depends on: #24530 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	workshop-AIM-AG-2024 t-algebra t-algebraic-geometry t-category-theory merge-conflict WIP label:t-algebra$	253/15	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Descent.lean,Mathlib/Algebra/Homology/ShortComplex/ExactFunctor.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/LocalProperties/Basic.lean,Mathlib/RingTheory/RingHom/FaithfullyFlat.lean,Mathlib/RingTheory/RingHom/Finite.lean,Mathlib/RingTheory/RingHom/Flat.lean,Mathlib/RingTheory/RingHom/Integral.lean,Mathlib/RingTheory/RingHom/Locally.lean,Mathlib/RingTheory/RingHom/Surjective.lean,Mathlib/RingTheory/RingHom/Unramified.lean,Mathlib/RingTheory/RingHomProperties.lean	16	4	['dagurtomas', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	49-34817 1 month ago	49-34819 1 month ago	0-0 0 seconds
21776	alreadydone author:alreadydone	Invertible modules	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	571/26	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Module/Submodule/Equiv.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/PicardGroup.lean	5	3	['alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	48-63796 1 month ago	48-63797 1 month ago	0-0 0 seconds
20722	ctchou author:ctchou	feat(Counterexamples): the Vitali set is non-measurable	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict please-adopt awaiting-author	258/3	Counterexamples.lean,Counterexamples/VitaliSetNotMeasurable.lean,Mathlib/MeasureTheory/Measure/NullMeasurable.lean,docs/1000.yaml	4	76	['ctchou', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'vihdzp']	vihdzp assignee:vihdzp	48-54142 1 month ago	48-69030 1 month ago	0-0 0 seconds
27446	grunweg author:grunweg	chore: more enorm lemmas	Nothing to see yet: this is a big mess! Start unrolling at `eLpNorm_le_eLpNorm_top_mul_eLpNorm_enorm`; that proof could be a good next target. Need a version of `eLpNorm'_const_smul' which applies to NNReal (or ENNReal, I guess): need to generalise a bunch of lemmas for that. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson merge-conflict WIP	107/9	Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	48-45656 1 month ago	48-45657 1 month ago	0-172 2 minutes
14583	lecopivo author:lecopivo	fix: make concrete cycle notation local	fix: make c[...] notation for concrete cycles local --- The notation for concrete cycles prevents you using `c[i]` notation for `c : Array _` This currently does not work ``` import Mathlib variable (c : Array Nat) (i : Fin c.size) #check c[i] -- breaks because of notation for concrete cycles ``` This PR just marks it as local to prevent this issue. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	1/1	Mathlib/GroupTheory/Perm/Cycle/Concrete.lean	1	3	['eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	46-64970 1 month ago	46-64971 1 month ago	0-12793 3 hours
19097	Vierkantor author:Vierkantor	chore(Algebra.Polynomial): split `Polynomial/Basic.lean` into smaller files	This PR splits `Mathlib.Algebra.Polynomial.Basic` into the following files: * `Polynomial/Defs.lean`: definition and ring structure on `R[X]` * `Polynomial/Module.lean`: module structure on `R[X]` * `Polynomial/Monomial.lean`: merged definition of `monomial`, `X`, `C` into the existing file (this is probably the file you want to import from now on) * `Polynomial/EraseUpdate.lean`: definition of `erase` and `update` * `Polynomial/Sum.lean`: definition of `sum` Initially I added the monomial results to a new file, but ended up merging it with `Monomial.lean` since the two of them merge cleanly. --- - [x] depends on: #28030 (going to resurrect this PR on top of that one later) - [x] depends on: #19095 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	3109/2500	Mathlib.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/MonoidAlgebra/Lift.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/MonoidAlgebra/Module.lean,Mathlib/Algebra/MonoidAlgebra/Opposite.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Cardinal.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Defs.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/TrailingDegree.lean,Mathlib/Algebra/Polynomial/EraseUpdate.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/Eval/Degree.lean,Mathlib/Algebra/Polynomial/Module.lean,Mathlib/Algebra/Polynomial/Monomial.lean,Mathlib/Algebra/Polynomial/Sum.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Ext.lean,Mathlib/Data/Finsupp/Fintype.lean,Mathlib/Data/Finsupp/Indicator.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Finsupp/Pointwise.lean,Mathlib/Data/Finsupp/SMulWithZero.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/List/ToFinsupp.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Eigs.lean,Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/Polynomial/Opposites.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/Tactic/ExtractGoal.lean,MathlibTest/Polynomial.lean,MathlibTest/instance_diamonds.lean,scripts/noshake.json	40	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	45-54402 1 month ago	51-47187 1 month ago	0-0 0 seconds
28054	EtienneC30 author:EtienneC30	feat: an abbreviation for sesquilinear forms	Define `SesquilinForm R M := M →ₗ⋆[R] M →ₗ[R] R`. Prove that a `SesquilinForm R M` is symmetric if and only if the corresponding matrix is Hermitian. --- - [ ] depends on: #27873 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	181/39	Counterexamples/QuadraticForm.lean,Mathlib.lean,Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/LinearAlgebra/BilinearForm/TensorProduct.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/Dual.lean,Mathlib/LinearAlgebra/RootSystem/Finite/CanonicalBilinear.lean,Mathlib/LinearAlgebra/RootSystem/OfBilinear.lean,Mathlib/LinearAlgebra/RootSystem/RootPositive.lean,Mathlib/LinearAlgebra/SesquilinearForm.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean	12	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	45-51730 1 month ago	45-51731 1 month ago	0-0 0 seconds
28622	alreadydone author:alreadydone	chore(Mathlib): replace `=>` by `↦`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	51792/51792	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Hom/Rat.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Rat.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Spectrum/Pi.lean,Mathlib/Algebra/Algebra/Spectrum/Quasispectrum.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Centralizer.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/Algebra/Subalgebra/IsSimpleOrder.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Matrix.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Subalgebra/Prod.lean,Mathlib/Algebra/Algebra/Subalgebra/Unitization.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/AlgebraicCard.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Finsupp/Fin.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/Finset/Sigma.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/Limits.lean,Mathlib/Algebra/Category/AlgCat/Monoidal.lean,Mathlib/Algebra/Category/BialgCat/Basic.lean,Mathlib/Algebra/Category/BoolRing.lean,Mathlib/Algebra/Category/CoalgCat/Basic.lean,Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/Algebra/Category/FGModuleCat/Limits.lean,Mathlib/Algebra/Category/Grp/AB.lean,Mathlib/Algebra/Category/Grp/Adjunctions.lean,Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/Grp/Biproducts.lean,Mathlib/Algebra/Category/Grp/CartesianMonoidal.lean,Mathlib/Algebra/Category/Grp/Colimits.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/Grp/FilteredColimits.lean,Mathlib/Algebra/Category/Grp/Images.lean,Mathlib/Algebra/Category/Grp/Kernels.lean,Mathlib/Algebra/Category/Grp/LargeColimits.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/Grp/Limits.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Category/Grp/ZModuleEquivalence.lean,Mathlib/Algebra/Category/Grp/Zero.lean,Mathlib/Algebra/Category/GrpWithZero.lean,Mathlib/Algebra/Category/HopfAlgCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Biproducts.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/Images.lean,Mathlib/Algebra/Category/ModuleCat/Injective.lean,Mathlib/Algebra/Category/ModuleCat/Kernels.lean,Mathlib/Algebra/Category/ModuleCat/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Abelian.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafify.lean,Mathlib/Algebra/Category/ModuleCat/Products.lean	3838	4	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	45-14881 1 month ago	45-14882 1 month ago	0-83357 23 hours
24793	tristan-f-r author:tristan-f-r	feat: trace of unitarily similar matrices	adds a theorem relating trace to unitarily similar matrices used in the easy direction of specht's theorem --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	7/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	4	['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'tristan-f-r']	nobody	45-10520 1 month ago	45-10521 1 month ago	1-55872 1 day
28532	alreadydone author:alreadydone	chore(Algebra/Ring/Defs): add two classes and extend more	Add the missing `NonAssocComm(Semi)ring` and modify existing classes to `extends` more to remove some manual instances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	89/70	Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/NumberTheory/SelbergSieve.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/PowerSeries/GaussNorm.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/Tactic/Ring/Basic.lean,MathlibTest/TCSynth.lean	10	17	['alreadydone', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	44-34744 1 month ago	44-34745 1 month ago	2-77063 2 days
28675	vihdzp author:vihdzp	chore: deprecate `bsup`, `lsub`, `blsub`	This PR formally deprecates `Ordinal.bsup`, `Ordinal.lsub`, and `Ordinal.blsub`. These arose as ways to construct suprema of ordinals, before we realized it was a much better idea to simply work with the `ConditionallyCompleteLinearOrderBot` structure of `Ordinal`. As a consequence, it gets rid of some longstanding non-deprecated material depending on deprecated material. --- - [x] depends on: #28677 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	315/130	Mathlib/Order/IsNormal.lean,Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/SetTheory/Game/Birthday.lean,Mathlib/SetTheory/Ordinal/Family.lean,Mathlib/SetTheory/Ordinal/NaturalOps.lean,Mathlib/SetTheory/Ordinal/Topology.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	44-28692 1 month ago	44-42365 1 month ago	0-0 0 seconds
27872	JovanGerb author:JovanGerb	chore(gcongr): clean up imports	This PR removes redundant `gcongr` imports. And when we do import `gcongr`, we now also import the core `@[gcongr]` tags, and also `grw`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict delegated	7/23	Archive/Imo/Imo2019Q4.lean,Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/MvPolynomial/SchwartzZippel.lean,Mathlib/Algebra/Order/BigOperators/Expect.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SimpleGraph/Density.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Basic.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/NumberTheory/FLT/Polynomial.lean,Mathlib/NumberTheory/FermatPsp.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Filter/AtTopBot/Archimedean.lean,Mathlib/Tactic/GCongr/CoreAttrs.lean,Mathlib/Topology/EMetricSpace/Paracompact.lean	21	11	['JovanGerb', 'bryangingechen', 'github-actions', 'grunweg', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	nobody	43-77462 1 month ago	43-77462 1 month ago	4-34325 4 days
28626	alreadydone author:alreadydone	chore(Archive, Counterexamples): replace => by ↦	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	288/288	Archive/Arithcc.lean,Archive/Examples/IfNormalization/Result.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Archive/Examples/PropEncodable.lean,Archive/Imo/Imo1959Q1.lean,Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q4.lean,Archive/Imo/Imo1972Q5.lean,Archive/Imo/Imo1977Q6.lean,Archive/Imo/Imo1981Q3.lean,Archive/Imo/Imo1987Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo1998Q2.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2006Q5.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q3.lean,Archive/Imo/Imo2013Q1.lean,Archive/Imo/Imo2019Q1.lean,Archive/Imo/Imo2024Q5.lean,Archive/MiuLanguage/Basic.lean,Archive/MiuLanguage/DecisionSuf.lean,Archive/OxfordInvariants/Summer2021/Week3P1.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/AscendingDescendingSequences.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BirthdayProblem.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/Konigsberg.lean,Archive/Wiedijk100Theorems/Partition.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Archive/ZagierTwoSquares.lean,Counterexamples/AharoniKorman.lean,Counterexamples/CanonicallyOrderedCommSemiringTwoMul.lean,Counterexamples/CharPZeroNeCharZero.lean,Counterexamples/CliffordAlgebraNotInjective.lean,Counterexamples/DirectSumIsInternal.lean,Counterexamples/GameMultiplication.lean,Counterexamples/Girard.lean,Counterexamples/HomogeneousPrimeNotPrime.lean,Counterexamples/MapFloor.lean,Counterexamples/MonicNonRegular.lean,Counterexamples/Phillips.lean,Counterexamples/Pseudoelement.lean,Counterexamples/QuadraticForm.lean,Counterexamples/SorgenfreyLine.lean,Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean	54	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	43-44007 1 month ago	43-44008 1 month ago	2-48353 2 days
7300	ah1112 author:ah1112	feat: synthetic geometry	This is adding synthetic geometry using Avigad's axioms and formalizing Euclid Book I, through the Pythagorean theorem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry merge-conflict awaiting-author help-wanted	2661/0	Mathlib.lean,Mathlib/Geometry/Synthetic/Avigad/Axioms.lean,Mathlib/Geometry/Synthetic/Avigad/EuclidBookI.lean,Mathlib/Geometry/Synthetic/Avigad/Tactics.lean	4	74	['ah1112', 'alreadydone', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'plp127', 'tb65536', 'urkud']	nobody	43-2693 1 month ago	72-37651 2 months ago	0-0 0 seconds
13795	astrainfinita author:astrainfinita	perf(Algebra/{Group, GroupWithZero, Ring}/InjSurj): reduce everything	--- - [ ] depends on: #15192 - [ ] depends on: #15476 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	340/194	Mathlib/Algebra/Equiv/TransferInstance.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Ring/InjSurj.lean,scripts/noshake.json	9	37	['MichaelStollBayreuth', 'astrainfinita', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mattrobball']	nobody	42-50078 1 month ago	171-65083 5 months ago	52-31623 52 days
24095	lecopivo author:lecopivo	feat: `fun_prop` for Is(Bounded)LinearMap + notation `fun x ↦L[R] f x`	Sets up `fun_prop` for `IsLinearMap` and `IsBoundedLinearMap` also adds notation `fun x ↦ₗ[R] f x` and `fun x ↦L[R] f x` to write bundled versions like lambda function instead of the currently used pointfree notation.	large-import t-algebra merge-conflict label:t-algebra$	352/22	Mathlib.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LinearMap/Pi.lean,Mathlib/Algebra/Module/LinearMap/Prod.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,scripts/noshake.json	8	24	['dagurtomas', 'eric-wieser', 'github-actions', 'lecopivo', 'mathlib4-merge-conflict-bot']	dagurtomas assignee:dagurtomas	42-29079 1 month ago	42-29080 1 month ago	85-19916 85 days
25775	emilyriehl author:emilyriehl	feat(AlgebraicTopology/SimplicialSet/NerveAdjunction): to Strict Segal 2	Under a suitable hypothesis, a map of 2-truncated simplicial sets can be generated from a refl prefunctor between the underlying reflexive quivers --- provided the codomain is `StrictSegal`. This abstracts a previously formalized result that requires the codomain to be the 2-truncated nerve of a category. Co-authored-by: Aaron Liu --- The current draft displays the old code for comparison with new versions labeled ALT. After initial review this will be cut. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #23848. Original PR: https://github.com/leanprover-community/mathlib4/pull/23848	t-algebraic-topology infinity-cosmos t-category-theory merge-conflict awaiting-author	457/206	Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/EqToHom.lean	7	38	['emilyriehl', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'robin-carlier']	robin-carlier assignee:robin-carlier	42-21706 1 month ago	42-21707 1 month ago	17-16247 17 days
28095	Equilibris author:Equilibris	Univ generic corec	Draft PR: Adding variable universe corecursor for PFunctor --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict	321/70	Mathlib/Data/PFunctor/Multivariate/Basic.lean,Mathlib/Data/PFunctor/Multivariate/M.lean,Mathlib/Data/TypeVec.lean	3	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	42-11324 1 month ago	42-11325 1 month ago	0-0 0 seconds
28150	Equilibris author:Equilibris	chore: clean up proofs typevec proofs	While adding variable universe corecs I found a lot of theorems in typevec that could do with a bit of a clean-up --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict	24/26	Mathlib/Data/TypeVec.lean	1	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	42-11323 1 month ago	42-11324 1 month ago	13-49738 13 days
26478	JovanGerb author:JovanGerb	chore(LibraryRewrite): replace `rw??` with `rw?`	As suggested by @YaelDillies, now `rw?` overwrites Lean core's implementation of `rw?`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	56/49	Mathlib/Tactic/Widget/LibraryRewrite.lean,MathlibTest/LibraryRewrite.lean,MathlibTest/rewrites.lean	3	6	['YaelDillies', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	41-81478 1 month ago	41-81478 1 month ago	41-80687 41 days
27868	grunweg author:grunweg	linter indentation playground	--- Trying out the changes in #27525. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict WIP	413/0	Mathlib/AlgebraicTopology/SimplexCategory/Augmented.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Basic.lean,Mathlib/CategoryTheory/Sites/Coherent/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/Init.lean,Mathlib/ModelTheory/Algebra/Ring/Basic.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Basic.lean,Mathlib/ModelTheory/Basic.lean,Mathlib/ModelTheory/Graph.lean,Mathlib/ModelTheory/Order.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Util/Notation3.lean	15	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	41-80917 1 month ago	41-80918 1 month ago	0-1 1 second
27403	MoritzBeroRoos author:MoritzBeroRoos	fix: replace probably erroneous usage of ⬝ (with old \cdot) by · (with \centerdot)	Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations \cdot and \centerdot resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for center..). This pr replaces instances of ⬝ where · was probably meant. All of the replacement is in comments, except for the file bench_summary.lean which is used for priting the github benchmark results. Since this file is about scientific notation of numbers, sure · was meant to be used, not a rectangle. [Related](https://github.com/leanprover-community/mathlib4/pull/27399) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict	195/195	Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/DirectSum/Idempotents.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/Normed/Unbundled/InvariantExtension.lean,Mathlib/Analysis/SpecialFunctions/Complex/CircleAddChar.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/FieldTheory/PurelyInseparable/PerfectClosure.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/NumberTheory/SiegelsLemma.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Instances/Matrix.lean,scripts/bench_summary.lean	49	5	['eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	41-77043 1 month ago	64-52965 2 months ago	7-54661 7 days
28042	kckennylau author:kckennylau	feat(Topology/ValuativeRel): a topological basis indexed by pairs of elements	--- The pullback PR of #27314 and #27163. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	140/23	Mathlib/RingTheory/Valuation/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	2	3	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	41-76997 1 month ago	41-76997 1 month ago	7-4998 7 days
26015	linesthatinterlace author:linesthatinterlace	feat: Add high-level generalizations from `MonoidHom` lifts	This PR continues the work from #25296. Original PR: https://github.com/leanprover-community/mathlib4/pull/25296	migrated-from-branch t-algebra merge-conflict label:t-algebra$	1251/156	Mathlib/Algebra/Category/Ring/FinitePresentation.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/Ring/Hom/Basic.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/NumberTheory/DirichletCharacter/Basic.lean,Mathlib/RingTheory/Ideal/Maps.lean	12	3	['github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	41-38900 1 month ago	41-38900 1 month ago	17-68720 17 days
27399	MoritzBeroRoos author:MoritzBeroRoos	chore: replace every usage of ⬝ᵥ (with old \cdot) by ·ᵥ (with \centerdot)	Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations `\cdot` and `\centerdot` resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for `center`..): - `\cdot` gives ⬝ [U+2B1D](https://www.compart.com/en/unicode/U+2B1D) "Black Very Small Square" - `\centerdot` gives · [U+00B7](https://www.compart.com/en/unicode/U+00B7) "Middle Dot" Mathlib mostly uses the `\centerdot` variant, except for the dotProduct notation and some probably unsuspecting people wanting \centerdot but getting \cdot in their comments and 6 uses of a notation using the raw `\cdot` without any subscript at `Mathlib\Topology\Homotopy\Product.lean`. This PR replaces the dot product `⬝ᵥ` with its `\centerdot` counterpart `·ᵥ`. The related PR [here](https://github.com/leanprover/vscode-lean4/pull/639) can then overwrite the `\cdot` abbreviation, to produce the same symbol as the `centerdot` abbreviation does. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict	133/133	Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/Topology/Instances/Matrix.lean	25	6	['MoritzBeroRoos', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	41-38875 1 month ago	64-52966 2 months ago	7-62439 7 days
27835	edegeltje author:edegeltje	feat(Tactic): ring modulo a given characteristic	This PR extends the `ring` tactic with a new config argument `char` which will try to reduce all constant terms modulo the given characteristic. This allows `ring` to prove e.g. `(x + y)^3 = x^3 + y^3` in characteristic 3. This is a simpler and faster way to do so than what we had before: `repeat { ring; reduce_mod_char }` becomes `ring (config := { char := 3 })`. The first step is to split off the required `CharP` definitions, since `Mathlib.Algebra.CharP.Basic` already requires the `ring` tactic. To perform the reduction modulo the given characteristic, I implemented `reduceCast` which reduces a raw integer, and wrapped it in `reduceResult` that takes a `NormNum.Result` for easy use. We need to pass through quite a few parameters into `reduceResult` so maybe it's worth defining a structure, or reusing `Cache` for this. Then it's basically a case of replacing every place where `ring` constructs a numeral with a call to `reduceResult`. Limitations: * `ring` doesn't attempt to detect the characteristic by itself, you need to pass it in explicitly. Trying to infer a `CharP` instance at each point sounds quite expensive. * Since the support for `%` in `NormNum` only exists for integers, I implemented the reduction only when a `Ring` instance is available. It is still sound in the semiring case, just not complete. * We could optimize exponentiation in the specific case where the characteristic `p` is a prime that divides the exponent `n`: `(x + y)^n = x^n + y^n`. I'll leave that to future work. --- This used to be #10765 by Anne Baanen before the great forkening. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	migrated-from-branch large-import t-meta merge-conflict	312/133	Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/RingTheory/MvPolynomial/Basic.lean,Mathlib/Tactic/LinearCombination.lean,Mathlib/Tactic/Module.lean,Mathlib/Tactic/Polyrith.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Tactic/Ring/Compare.lean,Mathlib/Tactic/Ring/RingNF.lean,MathlibTest/ring_compare.lean,MathlibTest/ring_mod_char.lean	10	4	['edegeltje', 'github-actions', 'mathlib4-merge-conflict-bot']	joneugster assignee:joneugster	40-42711 1 month ago	51-10468 1 month ago	11-83928 11 days
25889	plp127 author:plp127	fix(Tactic/Widget/Conv): fix various issues	Fixes various issues with the `conv?` widget. Closes #25162. ([Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/bug.20in.20.60conv.3F.60)) Specifically, fixes issues with `conv?` where - when converting a `SubExpr.Pos` to conv directions, it always uses the goal expression as reference, even when working on a hypothesis, this often leads to bad results and makes it unusable on hypotheses - it refuses to go all the way in to a function (for example in `Nat.succ 0`, you can't access `Nat.succ`) - it refuses to enter binders where the name of the bound variable contains the character `0` (try it on `∀ (x0 : Nat), x0 = x0`) - it panics if it can't find a binder name instead of just coming up with one itself, this also means usually you can't enter either side of a non-dependent arrow since those usually don't have binder names (try it on `False → False`) - you can't enter the type of a binder, you end up going into the body instead (try it on `fun (x : False) => (x.elim : False → Nat) x.elim`) - you can't partially enter a function, you end up going to the top argument after instead (for example, in the expression `id (id id) 0`, when you click on `id (id id)`, you end up going to `id id`) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	419/84	Mathlib/Tactic/Widget/Conv.lean,MathlibTest/conv?.lean	2	5	['bryangingechen', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	bryangingechen and kmill assignee:kmill assignee:bryangingechen	40-27168 1 month ago	40-27169 1 month ago	70-58775 70 days
23621	astrainfinita author:astrainfinita	chore: deprecate `LinearOrderedComm{Monoid, Group}WithZero`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #20676	t-order t-algebra merge-conflict label:t-algebra$	261/205	Archive/Imo/Imo1998Q2.lean,Counterexamples/LinearOrderWithPosMulPosEqZero.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/NNRat/Lemmas.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Defs.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean,Mathlib/NumberTheory/FunctionField.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/RingTheory/Valuation/Archimedean.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/ExtendToLocalization.lean,Mathlib/RingTheory/Valuation/Integers.lean,Mathlib/RingTheory/Valuation/Integral.lean,Mathlib/RingTheory/Valuation/Minpoly.lean,Mathlib/RingTheory/Valuation/Quotient.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/RingTheory/Valuation/ValExtension.lean,Mathlib/RingTheory/Valuation/ValuationRing.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean,Mathlib/Topology/UnitInterval.lean,MathlibTest/instance_diamonds.lean,scripts/noshake.json	44	n/a	['astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	kbuzzard assignee:kbuzzard	40-22165 1 month ago	unknown	unknown
28863	yury-harmonic author:yury-harmonic	ignore: make CI build oleans	It looks like CI doesn't build oleans unless I open a PR. Or I can't see this workflow. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	1123/100	Mathlib.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Nat/Defs.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Torsion.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/MvPolynomial/Expand.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Positive/Field.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Ring/Periodic.lean,Mathlib/Algebra/Ring/Torsion.lean,Mathlib/AlgebraicTopology/DoldKan/Decomposition.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Data/DFinsupp/NeLocus.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Filter.lean,Mathlib/Data/Finset/Option.lean,Mathlib/Data/Finsupp/NeLocus.lean,Mathlib/Data/Multiset/Defs.lean,Mathlib/Data/Multiset/Filter.lean,Mathlib/Data/NNRat/Floor.lean,Mathlib/Data/Nat/Count.lean,Mathlib/Data/Nat/Factorial/Basic.lean,Mathlib/Data/Nat/NthRoot/Defs.lean,Mathlib/Data/Nat/NthRoot/Lemmas.lean,Mathlib/Data/Nat/Totient.lean,Mathlib/Data/PNat/Factors.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Data/Rat/Lemmas.lean,Mathlib/Data/ZMod/ValMinAbs.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean,Mathlib/LinearAlgebra/Matrix/SemiringInverse.lean,Mathlib/Logic/Function/Defs.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/Order/Partition/Finpartition.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Expand.lean,Mathlib/Tactic/NormNum/Basic.lean,Mathlib/Tactic/Positivity/Basic.lean,MathlibTest/norm_num_ext.lean,MathlibTest/positivity.lean	49	3	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	39-61998 1 month ago	39-61999 1 month ago	0-0 0 seconds
28933	artie2000 author:artie2000	WIP chore(Data): correct definition for `single_apply`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	101/98	Counterexamples/DirectSumIsInternal.lean,Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/DFinsupp/Sigma.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Finsupp/SMul.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/Finsupp/ToDFinsupp.lean,Mathlib/LinearAlgebra/Basis/Basic.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/Basis/Prod.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Finsupp/LinearCombination.lean,Mathlib/LinearAlgebra/Finsupp/Supported.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean,Mathlib/LinearAlgebra/FreeModule/Finite/CardQuotient.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Multilinear/DFinsupp.lean,Mathlib/LinearAlgebra/StdBasis.lean,Mathlib/RingTheory/MvPolynomial/Groebner.lean	31	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	38-10669 1 month ago	38-10670 1 month ago	0-75271 20 hours
27437	kckennylau author:kckennylau	feat(RingTheory/Valuation): some lemmas about comparing with 1 and 0 and with each other	From the 2025 Local Class Field Theory Workshop. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict WIP	109/22	Mathlib/NumberTheory/Padics/ValuativeRel.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Extension.lean,Mathlib/RingTheory/Valuation/ValuativeRel.lean	4	20	['erdOne', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'matthewjasper', 'pechersky']	nobody	37-41456 1 month ago	37-41457 1 month ago	14-30610 14 days
28708	sjh227 author:sjh227	feat (Data) : edit DoublyStochastic, add Stochastic to matrix	edit DoublyStochastic add Stochastic --- Add the file Stochastic to matrix. Edit DoublyStochastic so that it depends on Stochastic along with a new lemma	t-data new-contributor merge-conflict	249/1	Mathlib.lean,Mathlib/Data/Matrix/DoublyStochastic.lean,Mathlib/Data/Matrix/Stochastic.lean	3	26	['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'sjh227']	nobody	37-29587 1 month ago	37-29587 1 month ago	0-78027 21 hours
6042	MohanadAhmed author:MohanadAhmed	feat(LinearAlgebra/Matrix/SVD): Singular Value Decomposition of R or C Matrices	This file provides proves the SVD theorem which decomposes a real/complex matrix into left eigenvectors, singular values block diagonal matrix and right eigenvectors. Any matrix A (M × N) with rank r = A.rank and with elements in ℝ or ℂ fields can be decompsed into the product of three matrices: $$A = USV$$ * The three matrices are defined as - $U$: an M × M matrix containing the left eigenvectors of the matrix - $S$: an M × N matrix with an r × r block in the upper left corner with nonzero singular values - $V$: an N × N matrix containing the right eigenvectors of the matrix Note that * $S$ is a block matrix $S = [S₁₁, S₁₂; S₂₁, S₂₂]$ with - $S₁₁$: a diagonal r × r matrix and - $S₁₂$ : r × (N - r) zero matrix, S₂₁ : (M - r) × r zero matrix and - $S₂₂$: (M - r) × (N - r) zero matrix * $U$ is a block column matrix U = [U₁ U₂] with - $U₁$ : a M × r containing left eigenvectors with nonzero singular values. - $U₂$ : a M × (M - r) containing left eigenvectors with zero singular values. * $V$ is a block column matrix V = [V₁ V₂] with - $V₁$ : a N × r containing right eigenvectors with nonzero singular values. - $V₂$ : a M × (M - r) containing right eigenvectors with zero singular values. Since in mathlib the eigenvalues of hermitian matrices are defined in an "arbitrary" undetermined order, we begin by partition the singular values into zero and non-zero values. We partition the corresponding eigenvectors from AᴴA and AAᴴ using similar rearrangements. These are included in `SVD.svdReindex`. The basic API for Column and Row partitioned matrices is from `ColumnRowPartitioned`. We then proceed to transfer some of the lemmas we need about eigenvector matrices (for example that they are unitary: i.e. inverse is conjugate transpose.). Note that since invertibility in mathlib is defined for square matrices while our matrices are partitioned i.e. N × (N₁ ⊕ N₂) and N ≃ (N ⊕ N₂), Lean cannot apply the Invertible definition. We workaround this were necessary. Lemma `reduced_spectral_theorem` (`reduced_spectral_theorem'`) shows that AᴴA and AAᴴ, can be reduced to products containing only the non-zero singular eigenvectors. This is later used in proving the main SVD theroem. A few lemmas are provided about the invertibility of the non-zero singular values matrix: `svdσ_inv`, `σ_inv_μ_σ_inv_eq_one`, `IsUnit_det_svdσ`, `IsUnit_det_svdσ_mapK` and `svdσ_inv_mapK`. To make relating left eigenvectors to right eigenvectors easier we define U₁ = AV₁σ⁻¹ while U₂ is obtained from the eigenvectors of (AAᴴ). This avoid a lengthy reindexing operation with many proofs. The vectors in U₂ have no such issue since they are multiplied by zero singular values anyway. Co-authored-by: Mohanad Ahmed --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict please-adopt WIP label:t-algebra$	588/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/SVD/Defs.lean,Mathlib/LinearAlgebra/Matrix/SVD/Reindex.lean	3	115	['MohanadAhmed', 'Vierkantor', 'alexjbest', 'eric-wieser', 'j-loreaux', 'jcommelin', 'mathlib4-merge-conflict-bot', 'sgouezel']	nobody	37-12596 1 month ago	37-12597 1 month ago	181-72917 181 days
28826	alreadydone author:alreadydone	feat(Category): add `SemimoduleCat`	+ introduce Presemiadditive categories, which generalizes Preadditive categories: the Hom sets are commutative monoids rather than groups, and `comp_zero` and `zero_comp` is no longer automatic. The new file Preadditive/Semi.lean is adapted from Preadditive/Basic.lean, though many contents can't be generalized. + generalize Functor.Additive and Functor.Linear to take Presemiadditive categories instead. The former needs a `map_zero` field since it's not automatic for Presemiadditive categories. + introduce SemimoduleCat, the category of semimodules (mathlib's Module) over a Semiring. The new file ModuleCat/Semi.lean is copied from ModuleCat/Basic.lean. TODOs: additive/linear equivalence between SemimoduleCat and ModuleCat and use it to transfer results; monoidal structure on SemimoduleCat; change `CommRing.Pic` to use SemimoduleCat. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-CI merge-conflict	978/123	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Semi.lean,Mathlib/Algebra/Category/MonCat/Presemiadditive.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/CategoryTheory/Preadditive/AdditiveFunctor.lean,Mathlib/CategoryTheory/Preadditive/Basic.lean,Mathlib/CategoryTheory/Preadditive/Biproducts.lean,Mathlib/CategoryTheory/Preadditive/FunctorCategory.lean,Mathlib/CategoryTheory/Preadditive/Semi.lean	9	4	['alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	nobody	37-7235 1 month ago	37-21474 1 month ago	0-1 1 second
27785	staroperator author:staroperator	chore(Algebra/Group/Submonoid): golf `Nat.addSubmonoidClosure_one` using `simp`	This should improve the proof readability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict label:t-algebra$	8/15	Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Order/Star/Basic.lean	3	9	['github-actions', 'joneugster', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'staroperator']	joneugster assignee:joneugster	36-82338 1 month ago	36-82339 1 month ago	26-34065 26 days
28148	kckennylau author:kckennylau	feat(Matrix): Simproc and Rw-proc for Matrix Transpose	Co-authored by Aaron Liu. ```lean example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by rw [transpose_of% 2 3] example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by rw [transpose_of] example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by simp only [matrix_transpose] ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	267/8	Mathlib.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/LinearAlgebra/UnitaryGroup.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/Matrix.lean,MathlibTest/Simproc/Matrix.lean,MathlibTest/matrix.lean,scripts/noshake.json	8	32	['eric-wieser', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'plp127']	eric-wieser assignee:eric-wieser	36-82209 1 month ago	36-82210 1 month ago	16-54453 16 days
20850	vihdzp author:vihdzp	chore(Logic/Equiv/Basic): extend `sumCompl` API	We make a couple of redundant arguments implicit, rename two misnamed theorems, and add two new ones. --- I'm not sure if the theorems I renamed actually had the correct name; if they did, then [`Equiv.Set.sumCompl_symm_apply_of_mem`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Logic/Equiv/Set.html#Equiv.Set.sumCompl_symm_apply_of_mem) and [`Equiv.Set.sumCompl_symm_apply_of_not_mem`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Logic/Equiv/Set.html#Equiv.Set.sumCompl_symm_apply_of_not_mem) should be renamed instead to match. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-logic merge-conflict awaiting-author	21/6	Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/Fintype.lean	2	6	['eric-wieser', 'github-actions', 'grunweg', 'kbuzzard', 'vihdzp']	nobody	36-82204 1 month ago	197-77011 6 months ago	28-73677 28 days
26510	alreadydone author:alreadydone	feat(Matroid): exchange lemmas involving closure	--- for #24350 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-combinatorics merge-conflict	37/0	Mathlib/Data/Matroid/Closure.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	kmill assignee:kmill	36-17985 1 month ago	36-17986 1 month ago	60-26324 60 days
26097	adomani author:adomani	dev: the relative linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict awaiting-author WIP	316/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/Local.lean,Mathlib/Util/ParseGit.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	35-80905 1 month ago	35-80906 1 month ago	0-0 0 seconds
26337	mans0954 author:mans0954	feat(Analysis/NormedSpace/MStructure): M-ideals	This PR continues the work from #14369. Original PR: https://github.com/leanprover-community/mathlib4/pull/14369	large-import t-analysis merge-conflict WIP	857/40	Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/Hom.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Analysis/Normed/Module/Complemented.lean,Mathlib/Analysis/NormedSpace/MStructure.lean	5	n/a	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	35-14343 1 month ago	unknown	unknown
26343	mans0954 author:mans0954	feat(Analysis/Normed/Module/Complemented): The idempotent associated with a complemented subspace	Given a complemented subspace `p` of a Banach space `E`, with complement `q`, there exists an idempotent `P` in the ring `E →L[𝕜] E` such that `P` has range `p` and kernel `q`. Similarly `1-P` has range `q` and kernel `p`. See Rudin, Functional Analysis, Theorem 5.16. --- This PR continues the work from #20330. Original PR: https://github.com/leanprover-community/mathlib4/pull/20330 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis awaiting-CI merge-conflict WIP	185/3	Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/Hom.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Analysis/Normed/Module/Complemented.lean,Mathlib/RingTheory/Idempotents.lean	5	3	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	35-14342 1 month ago	35-14343 1 month ago	0-0 0 seconds
28743	vihdzp author:vihdzp	refactor: `Ordinal.IsNormal` → `Order.IsNormal`	We deprecate `Ordinal.IsNormal` in favor of the more general `Order.IsNormal`. --- - [ ] depends on: #28740 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	280/156	Mathlib.lean,Mathlib/Order/IsNormal.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Enum.lean,Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/SetTheory/Ordinal/Family.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Topology.lean,Mathlib/SetTheory/Ordinal/Veblen.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Order/IsNormal.lean	12	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	34-13861 1 month ago	34-13863 1 month ago	0-0 0 seconds
26931	javra author:javra	feat(CategoryTheory/Enriched): `V`-enriched isomorphisms	Defines isomorphisms in `V`-enriched categories and relate them to ordinary isomorphisms in the case of ordinary enriched categories. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos t-category-theory merge-conflict awaiting-author	211/14	Mathlib.lean,Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/Enriched/Iso.lean,Mathlib/CategoryTheory/Enriched/Opposite.lean,Mathlib/CategoryTheory/Enriched/Ordinary/Basic.lean,Mathlib/CategoryTheory/Enriched/Ordinary/Iso.lean	6	21	['emilyriehl', 'github-actions', 'javra', 'joelriou', 'mathlib4-merge-conflict-bot', 'mckoen']	nobody	32-57315 1 month ago	32-57316 1 month ago	19-77946 19 days
26912	pechersky author:pechersky	chore(Algebra/Ring/Subring): simp tag `Subring.smul_def`	s-multiplying by a subtype is easiest to manipulate when both terms are in the ambient type. Many places that had to use the _def lemma for a rewrite, or to include it in a simp set, no longer have to. Ported from #25308 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) I found this being not-simp frustrating when talking about submodules over a valuation subring.	maintainer-merge t-algebra merge-conflict label:t-algebra$	68/67	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Exact.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Ring/Periodic.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/LinearAlgebra/RootSystem/Irreducible.lean,Mathlib/LinearAlgebra/RootSystem/RootPositive.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/RingTheory/Etale/Kaehler.lean,Mathlib/RingTheory/LocalProperties/Projective.lean,Mathlib/RingTheory/Localization/InvSubmonoid.lean,Mathlib/RingTheory/OreLocalization/Basic.lean	25	19	['artie2000', 'eric-wieser', 'github-actions', 'j-loreaux', 'linesthatinterlace', 'mathlib4-merge-conflict-bot', 'pechersky']	joelriou assignee:joelriou	32-47770 1 month ago	32-47771 1 month ago	51-74059 51 days
22782	alreadydone author:alreadydone	feat(Topology): étalé space associated to a predicate on sections	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	886/160	Mathlib.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Geometry/Manifold/Sheaf/Smooth.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Topology/EtaleSpace.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/Sheaves/LocalPredicate.lean,Mathlib/Topology/Sheaves/Sheafify.lean,Mathlib/Topology/Sheaves/Stalks.lean	10	16	['AntoineChambert-Loir', 'alreadydone', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	PatrickMassot assignee:PatrickMassot	32-46139 1 month ago	59-10495 1 month ago	30-3459 30 days
25208	erdOne author:erdOne	feat(LinearAlgebra): `tensor_induction` macro	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC merge-conflict WIP label:t-algebra$	87/116	Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Central/TensorProduct.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/RingTheory/Flat/Equalizer.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/Finite.lean,Mathlib/RingTheory/Unramified/Finite.lean	8	8	['chrisflav', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	31-78682 1 month ago	31-78682 1 month ago	0-600 10 minutes
28803	astrainfinita author:astrainfinita	refactor: unbundle algebra from `ENormed*`	Further speed up the search in the algebraic typeclass hierarchy by avoiding searching for `TopologicalSpace`. This PR continues the work from #23961. - Change `ESeminormed(Add)Monoid` and `ENormed(Add)Monoid` so they no longer carry algebraic data. - Deprecate `ESeminormed(Add)CommMonoid` and `ENormed(Add)CommMonoid` in favor of `ESeminormed(Add)Monoid` and `ENormed(Add)Monoid` with a commutative algebraic typeclass. \|Old\|New\| \|---\|---\| \| `[ESeminormed(Add)(Comm)Monoid E]` \| `[(Add)(Comm)Monoid E] [ESeminormed(Add)Monoid E]` \| \| `[ENormed(Add)(Comm)Monoid]` \| `[(Add)(Comm)Monoid E] [ENormed(Add)Monoid]` \| See [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2328803.20refactor.3A.20unbundle.20algebra.20from.20.60ENormed*.60/with/536024350) ------------ - [x] depends on: #28813	awaiting-zulip slow-typeclass-synthesis t-algebra t-analysis merge-conflict label:t-algebra$	80/63	Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/Normed/Group/InfiniteSum.lean,Mathlib/Analysis/NormedSpace/IndicatorFunction.lean,Mathlib/MeasureTheory/Function/L1Space/AEEqFun.lean,Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean	14	28	['astrainfinita', 'bryangingechen', 'github-actions', 'grunweg', 'kbuzzard', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	grunweg assignee:grunweg	31-9810 1 month ago	31-9811 1 month ago	0-20585 5 hours
26603	vihdzp author:vihdzp	refactor(SetTheory/Ordinal/FixedPoint): redefine `Ordinal.deriv`	We previously defined the [ordinal derivative](https://en.wikipedia.org/wiki/Normal_function#Properties) of a function as the unique normal function satisfying `deriv f 0 = nfp f 0` and `deriv f (o + 1) = nfp f (deriv f o)` (where `nfp f a` is the next fixed point of `f` that's `≥ a`). The motivation here was to give a "nice" junk value on non-normal functions (the derivative is normal no matter what). However, in practice, this definition makes it unwieldy to prove things, by either requiring a tedious zero/successor/limit argument, or requiring one to rewrite `deriv f = enumOrd (fixedPoints f)`. We can instead define `deriv f = enumOrd (fixedPoints f)`. At the cost of giving "worse" junk values (which we have no legitimate uses of), we're able to much more easily prove all the expected properties in the standard case where `f` is a normal function. Finally, we do some drive-by API cleanup. --- The GitHub diff is a bit messy, I made my best to clean it up. Moved from #21858. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	173/200	Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Veblen.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	30-81898 1 month ago	30-81899 1 month ago	12-50686 12 days
25662	erdOne author:erdOne	chore: redefine `LocalizedModule`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	196/228	Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/GroupTheory/OreLocalization/OreSet.lean,Mathlib/RingTheory/OreLocalization/Ring.lean,Mathlib/RingTheory/TensorProduct/Nontrivial.lean	6	14	['erdOne', 'eric-wieser', 'github-actions', 'kckennylau', 'leanprover-bot', 'leanprover-community-bot-assistant', 'vihdzp']	nobody	30-78622 1 month ago	30-79305 1 month ago	45-34308 45 days
29345	adomani author:adomani	test: automatically remove deprecations from before 2025-02-31	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	201/1358	Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/InnerProductSpace/Projection/Basic.lean,Mathlib/Combinatorics/Matroid/Circuit.lean,Mathlib/Combinatorics/Matroid/Closure.lean,Mathlib/Combinatorics/Matroid/Minor/Restrict.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/Primrec.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/SuccPred.lean,Mathlib/Data/Finite/Card.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Fintype/BigOperators.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/List/GetD.lean,Mathlib/Data/List/MinMax.lean,Mathlib/Data/List/ModifyLast.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/NodupEquivFin.lean,Mathlib/Data/List/OfFn.lean,Mathlib/Data/List/ReduceOption.lean,Mathlib/Data/List/Rotate.lean,Mathlib/Data/List/Scan.lean,Mathlib/Data/List/TakeDrop.lean,Mathlib/Data/List/Zip.lean,Mathlib/Data/Matrix/ColumnRowPartitioned.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Seq/Defs.lean,Mathlib/Data/Set/Finite/Basic.lean,Mathlib/Data/Set/List.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/Stream/Init.lean,Mathlib/Data/String/Lemmas.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Constructions.lean,Mathlib/Geometry/RingedSpace/Basic.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/Pointwise.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Basic.lean,Mathlib/LinearAlgebra/Dimension/Constructions.lean,Mathlib/LinearAlgebra/Dimension/RankNullity.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/Spectrum.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/List.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/AEMeasurable.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/LpSeminorm/ChebyshevMarkov.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Defs.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Trim.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Complete.lean,Mathlib/MeasureTheory/Function/LpSpace/Indicator.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Lp.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/CircleTransform.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Countable.lean,Mathlib/MeasureTheory/Measure/Content.lean,Mathlib/MeasureTheory/Measure/Count.lean,Mathlib/ModelTheory/Basic.lean,Mathlib/ModelTheory/Definability.lean,Mathlib/ModelTheory/ElementarySubstructures.lean,Mathlib/ModelTheory/LanguageMap.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Substructures.lean,Mathlib/ModelTheory/Syntax.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/IsBoundedAtImInfty.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/NumberTheory/NumberField/House.lean,Mathlib/Order/Filter/AtTopBot/Monoid.lean,Mathlib/Order/Filter/AtTopBot/Ring.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Max.lean,Mathlib/Order/WithBot.lean,Mathlib/Probability/IdentDistrib.lean,Mathlib/Probability/Independence/Integrable.lean,Mathlib/Probability/Kernel/Composition/IntegralCompProd.lean,Mathlib/Probability/Kernel/Invariance.lean	132	0	[]	nobody	29-43206 29 days ago	29-43206 29 days ago	0-49 49 seconds
27566	wwylele author:wwylele	feat(Data/Real): Archimedean.embedReal is a ring hom when M is an ordered ring	Also shows that this ends up the same as `LinearOrderedField.inducedOrderRingHom` for fields --- This is a spin-off from #27268 ~~because I got bored~~ . This is not in a high priority as I don't need it for anything yet, but the last lemma shows that `embedReal` is a generalization of `LinearOrderedField.inducedOrderRingHom` (which is only stated for field, and I didn't find when I was making the group embedding). Perhaps we should refactor `Mathlib/Algebra/Order/CompleteField.lean` with the definition here. Indeed, if we replace every `ℝ` with `(R : Type*)[ConditionallyCompleteLinearOrderedField R]` in `Data/Real/Embedding.lean`, the proof still works. What do you think? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data merge-conflict	220/3	Mathlib/Data/Real/Embedding.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	27-75328 27 days ago	27-75329 27 days ago	40-32085 40 days
28151	iehality author:iehality	feat(Computability): r.e. sets are closed under inter/union/projection/composition	Prove that r.e. sets are closed under intersections, unions, projection and composition. --- This PR continues the work from #16705. Original PR: https://github.com/leanprover-community/mathlib4/pull/16705	t-computability merge-conflict awaiting-author	120/0	Mathlib/Computability/Halting.lean	1	13	['YaelDillies', 'github-actions', 'iehality', 'mathlib4-merge-conflict-bot']	YaelDillies assignee:YaelDillies	25-61873 25 days ago	25-61874 25 days ago	9-70671 9 days
12143	adomani author:adomani	feat: generic linter, absorbing `cdot` linter and `attribute [instance] in` linter	A "generic" syntax linter that can be configured using a function `Syntax → Array Syntax`. The expectations is that the function returns sub-syntax extracted from the input that should be flagged by the linter. This PR provides two examples. * Flags uses of `cdot` that are not typed as `·`. * #12137 is a PR that inspired this one. * Flag uses of `attribute [instance] in` that is not limited to the next declaration * Inspired by the existing PR by Michael Rothgang #13190 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	210/2	Mathlib.lean,Mathlib/Combinatorics/Colex.lean,Mathlib/NumberTheory/LegendreSymbol/AddCharacter.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/GenericSyntaxLinter.lean,test/GenericSyntaxLinter.lean	7	19	['adomani', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	25-50462 25 days ago	417-38597 1 year ago	41-49960 41 days
26908	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): alternative ext principle for unitors	Currently, our infrastructure for left/right unitors for Day convolution of functors `C ⥤ V` do not have satisfactory extensionality principle: the current way to characterize morphisms out of `U ⊛ F` is the default extensionality principle for Day convolution, which characterizes first such functors via functors out of `U ⊠ F`. Left unitors are then obtained using the fact `U ⊠ F` is a left Kan extension of a functor from `PUnit × C` (which is equivalent to `C`) but we did not record on its own this principle. Using the transitivity of left Kan extensions proved in #26899, we directly exhibit `U ⊛ F` as a left Kan extension of `F ⋙ tensorLeft (𝟙_ V)` along `tensorLeft (𝟙_ C)`. The unit of this Kan extension is composed exactly of the morphisms that appear in the [characterization of left unitors](https://leanprover-community.github.io/mathlib4_docs/Mathlib/CategoryTheory/Monoidal/DayConvolution.html#CategoryTheory.MonoidalCategory.DayConvolutionUnit.leftUnitor_hom_unit_app). We also slightly generalize the instances that express that external products with unitors are left Kan extensions, so that they can be used when taking external products with more complicated functors than currently. This is again useful when chaining extensionality lemmas for morphisms out of terms of the form `(F ⊛ U) ⊛ G`. We prove a similar thing for right unitors With this, it should be possible to have a much more satisfactory way of working with Day convolutions: this allows to "elimiinate" units without ending up with terms in an external product. --- - [ ] depends on: #26899 - [ ] depends on: #26906 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	307/18	Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	25-42155 25 days ago	25-42156 25 days ago	0-1812 30 minutes
27150	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): constructors for braided and symmetric structure on day convolutions monoidal categories	Following the pattern in #27119, we give API to construct `BraidedCategory` and `SymmetricCategory` structures on a monoidal category equipped with a `LawfulDayConvolutionMonoidalCategoryStruct`. To achieve this, we introduce an other type class `LawfulDayConvolutionBraidedCategoryStruct` that bundles an associator isomorphism that behaves like the one constructed for functors in #27067. We provide a noncomputable constructor for this typeclass that takes as input fullness of the "realization" functor to a category of functors, and we show that the typeclasses are sufficient to define the desired structures. --- - [x] depends on: #27067 - [x] depends on: #26820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	826/9	Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean	2	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	25-37194 25 days ago	25-37982 25 days ago	0-1002 16 minutes
27119	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): constructors for closed monoidal day convolution monoidal structures	Following the pattern introduced in #26798 and #26820 and using results of #26879, we introduce a typeclass `LawfulDayConvolutionClosedMonoidalCategoryStruct` that encodes the data needed on a `LawfulDayConvolutionMonoidalCategoryStruct` to define well-behaved internal homs. We give a constructor assuming existence of relevant ends, and prove that this data defines a `MonoidalClosed` instance on the monoidal category structures one can deduce from `LawfulDayConvolutionMonoidalCategoryStruct`. --- - [x] depends on: #27079 - [x] depends on: #27091 - [x] depends on: #26879 - [x] depends on: #26820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	900/9	Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Closed.lean	2	6	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	24-51045 24 days ago	25-37979 25 days ago	0-1 1 second
28411	zcyemi author:zcyemi	feat(LinearAlgebra/AffineSpace/Simplex/Centroid): define centroid and medians	--- This file proves several lemmas involving the centroids and medians of a simplex in affine space. definitions: - `centroid` is the centroid of a simplex, defined as abbreviation of the `Finset.univ.centroid`. - `faceOppositeCentroid` is the centroid of the facet obtained as `(Simplex.faceOpposite i).centroid` - `median` is the line connecting a vertex to the faceOppositeCentroid. Main Results: - Commandino's theorem - The medians of a simplex are concurrent at the centroid - [ ] depends on #29128	large-import t-algebra merge-conflict label:t-algebra$	463/5	Mathlib/Geometry/Euclidean/MongePoint.lean,Mathlib/Geometry/Euclidean/Simplex.lean,Mathlib/LinearAlgebra/AffineSpace/Independent.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Centroid.lean,docs/1000.yaml	5	9	['github-actions', 'jsm28', 'mathlib4-merge-conflict-bot', 'zcyemi']	nobody	24-45030 24 days ago	24-45031 24 days ago	25-79919 25 days
28623	gilesgshaw author:gilesgshaw	feat(Logic/Basic): minor additions and simplification of proofs	Add new theorems and simplify proofs. Specifically, we add the family of related theorems `apply_dite_iff_exists`, `apply_dite_iff_forall`, `apply_ite_iff_and` and `apply_ite_iff_or`. For each other 'family' of theorems in the file that is analogous to the above, we do the following - Simplify proofs where possible, e.g. by appealing to the new theorems - Complete the family, if any of the corresponding four are missing - Rename to ensure consistency with the above pattern ---	new-contributor t-logic merge-conflict	83/55	Archive/Examples/IfNormalization/Result.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Notation/Indicator.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/Logic/Basic.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean,Mathlib/SetTheory/Ordinal/Notation.lean	9	12	['eric-wieser', 'gilesgshaw', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	awainverse assignee:awainverse	24-44906 24 days ago	24-44907 24 days ago	21-3001 21 days
24692	ScottCarnahan author:ScottCarnahan	feat (RingTheory/HahnSeries/Basic): isomorphism of Hahn series induced by order isomorphism	This PR introduces an isomorphism of Hahn series induced by an order isomorphism on the exponent posets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict WIP	35/0	Mathlib/RingTheory/HahnSeries/Basic.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	24-21286 24 days ago	24-21287 24 days ago	31-47622 31 days
28737	astrainfinita author:astrainfinita	refactor: deprecate `MulEquivClass`	This PR continues the work from #18806. Original PR: https://github.com/leanprover-community/mathlib4/pull/18806	maintainer-merge t-algebra merge-conflict awaiting-author label:t-algebra$	67/77	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Irreducible/Lemmas.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/Algebra/GroupWithZero/Equiv.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Ring/Divisibility/Basic.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/Star/MonoidHom.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/GroupTheory/Submonoid/Center.lean,Mathlib/LinearAlgebra/FreeModule/Finite/CardQuotient.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean	26	20	['Vierkantor', 'alreadydone', 'astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	23-51630 23 days ago	23-51631 23 days ago	4-17723 4 days
13036	joelriou author:joelriou	feat(CategoryTheory/Sites): under certain conditions, cover preserving functors preserve 1-hypercovers	Previously, in order to show that a functor between Grothendieck sites was continuous, it was necessary to show that it was "cover preserving" and "compatible preserving". There were two lemmas which could be used in order to show that a functor was "compatible preserving". Since #13012, the better condition of "1-hypercover preserving" functor was introduced and it implies that the functor is continuous. In this PR, under the same assumptions as in the two lemmas mentionned above, we show that cover preserving functors are 1-hypercover preserving functors. This gives slightly better criteria in order to show that a functor is continuous. --- - [x] depends on: #13004 - [x] depends on: #13011 - [x] depends on: #13012 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	94/7	Mathlib/CategoryTheory/Sites/Continuous.lean,Mathlib/CategoryTheory/Sites/CoverPreserving.lean,Mathlib/CategoryTheory/Sites/Over.lean,Mathlib/CategoryTheory/Sites/Sieves.lean	4	3	['github-actions', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	nobody	23-14230 23 days ago	23-14231 23 days ago	0-0 0 seconds
27335	eric-wieser author:eric-wieser	chore(Data/List): use simp-normal-form for boolean equalities	This replaces `¬(p x = true)` with `p x = false`. It also makes explicit some adjacent `h : p x` spellings for symmetry, but the `= true`s were already implied by the coercion. Zulip: [#lean4 > `h : ¬(b = true)` vs `h : b = false` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.60h.20.3A.20.C2.AC.28b.20.3D.20true.29.60.20vs.20.60h.20.3A.20b.20.3D.20false.60/near/529976237) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	38/32	Mathlib/Data/List/DropRight.lean,Mathlib/Data/List/SplitOn.lean,Mathlib/Data/List/TakeWhile.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	22-84272 22 days ago	22-84273 22 days ago	4-31215 4 days
29499	chrisflav author:chrisflav	feat(CategoryTheory/Sites): sheafification via hypercovers	This is very much WIP, but I need a fresh cache. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	2121/1	Mathlib.lean,Mathlib/CategoryTheory/Sites/HomotopyOneHypercover.lean,Mathlib/CategoryTheory/Sites/Hypercover/Refinement.lean,Mathlib/CategoryTheory/Sites/Hypercover/Sheafification.lean,Mathlib/CategoryTheory/Sites/OneHypercover.lean,Mathlib/CategoryTheory/Sites/ZeroHypercover.lean	6	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	22-54778 22 days ago	22-54779 22 days ago	0-0 0 seconds
29484	eric-wieser author:eric-wieser	refactor: switch to [] notation for Stream'	I'll continue fixing this only if people agree this is a good use of this notation. [#mathlib4 > Changing `Stream.Seq` to use `GetElem` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Changing.20.60Stream.2ESeq.60.20to.20use.20.60GetElem.60/near/538548680) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data merge-conflict	195/173	Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/ContinuedFractions/Computation/Basic.lean,Mathlib/Algebra/ContinuedFractions/Translations.lean,Mathlib/Combinatorics/Hindman.lean,Mathlib/Control/Fix.lean,Mathlib/Control/LawfulFix.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Seq/Defs.lean,Mathlib/Data/Stream/Defs.lean,Mathlib/Data/Stream/Init.lean,Mathlib/Data/WSeq/Basic.lean,Mathlib/Data/WSeq/Productive.lean	12	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	22-12891 22 days ago	22-54780 22 days ago	0-0 0 seconds
22517	j-loreaux author:j-loreaux	feat: `ℕ+` powers in semigroups	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict WIP	275/28	Mathlib.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/PNatPowAssoc.lean,Mathlib/Algebra/Group/PPow.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/ULift.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/ZMod/Defs.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/Tactic/ToAdditive/Frontend.lean	14	6	['eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-bot', 'mattrobball']	nobody	21-18213 21 days ago	203-69823 6 months ago	0-27 27 seconds
26857	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): define associated graded structure for abelian group	In this PR we define the associated graded structure for abelian group when given a filtration and only give some basic lemmas about it. Further results would be given in #26858 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #22631	t-algebra merge-conflict awaiting-author label:t-algebra$	153/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	12	['Thmoas-Guan', 'chrisflav', 'github-actions', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	20-83933 20 days ago	20-83934 20 days ago	18-81638 18 days
27933	grunweg author:grunweg	chore(OrdNode): format code example in code blocks	Wrap them in code blocks (and unindent them; that indentation is not needed any more). This also avoids warnings from the linter in #27898. ------- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	459/212	Mathlib/Data/Ordmap/Ordnode.lean	1	4	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	20-81939 20 days ago	20-81940 20 days ago	39-69478 39 days
28802	grunweg author:grunweg	feat: a tactic linter for continuity/measurability which can be `fun_prop`	--- Let's see if this finds further locations in mathlib :tada: This PR also runs the linter in mathlib by default. I strongly think this is a good idea --- but leaves all kinds of fun questions around "where do you import this linter best". Opinions on this welcome; this PR is a first start (but no more). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import awaiting-CI t-meta merge-conflict	144/26	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/TacticAnalysis/Declarations.lean,Mathlib/Tactic/TacticAnalysis/FunProp.lean,MathlibTest/TacticAnalysis2.lean	6	12	['Vierkantor', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	20-44197 20 days ago	20-44198 20 days ago	0-260 4 minutes
27508	chrisflav author:chrisflav	feat(RingTheory): height under ring homomorphism	We show that if `P` lies over `p`, the height of `P` is bounded by the height of `p` plus the height of the image of `P` in `S ⧸ p S`. In a follow-up PR, we show that equality holds if `S` satisfies going-down as an `R`-algebra. Co-authored by: Sihan Su Co-authored by: Yi Song --- - [x] depends on: #28520 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import merge-conflict	118/1	Mathlib/Data/Set/Finite/Basic.lean,Mathlib/Data/Set/Function.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Basic.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean	7	13	['YaelDillies', 'chrisflav', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	20-24241 20 days ago	37-27162 1 month ago	1-25924 1 day
29633	sgouezel author:sgouezel	Just for bench	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1046/690	.github/actionlint.yml,.github/workflows/nightly-docgen.yml,.github/workflows/nightly_detect_failure.yml,.github/workflows/report-grind-regressions.yml,Cache/Requests.lean,Mathlib.lean,Mathlib/Algebra/Field/Rat.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Order/Ring/Rat.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/Eval/SMul.lean,Mathlib/Algebra/Ring/Rat.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Data/DFinsupp/Notation.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Int/GCD.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Nat/GCD/Basic.lean,Mathlib/Data/Nat/GCD/BigOperators.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Data/Rat/Cast/Defs.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Data/Rat/Lemmas.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/Data/UInt.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/GroupTheory/Perm/Centralizer.lean,Mathlib/Init.lean,Mathlib/Lean/Expr/Rat.lean,Mathlib/Lean/Meta/CongrTheorems.lean,Mathlib/LinearAlgebra/PID.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Vandermonde.lean,Mathlib/Logic/Equiv/Prod.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/NumberTheory/Padics/PadicVal/Basic.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Defs/PartialOrder.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/Filter/Defs.lean,Mathlib/Probability/Distributions/Pareto.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Reassoc.lean,Mathlib/Tactic/CategoryTheory/Refs.lean,Mathlib/Tactic/DeriveFintype.lean,Mathlib/Tactic/FieldSimp.lean,Mathlib/Tactic/Hint.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm/Datatypes.lean,Mathlib/Tactic/Linter/DeprecatedModule.lean,Mathlib/Tactic/Linter/Header.lean,Mathlib/Tactic/Linter/Lint.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/NormNum/GCD.lean,Mathlib/Tactic/StacksAttribute.lean,Mathlib/Tactic/SuppressCompilation.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,Mathlib/Tactic/WLOG.lean,Mathlib/Testing/Plausible/Sampleable.lean,Mathlib/Util/Notation3.lean,Mathlib/Util/ParseCommand.lean,Mathlib/Util/Superscript.lean,MathlibTest/AssertExists.lean,MathlibTest/CalcQuestionMark.lean,MathlibTest/Change.lean,MathlibTest/DeprecateTo.lean,MathlibTest/FieldSimp.lean,MathlibTest/FindSyntax.lean,MathlibTest/LibrarySearch/basic.lean,MathlibTest/LibrarySearch/mathlib.lean,MathlibTest/LibrarySearch/observe.lean,MathlibTest/MinImports.lean,MathlibTest/RewriteSearch/Basic.lean,MathlibTest/RewriteSearch/Polynomial.lean,MathlibTest/StacksAttribute.lean,MathlibTest/Subsingleton.lean,MathlibTest/Use.lean,MathlibTest/Variable.lean,MathlibTest/hint.lean,MathlibTest/lift.lean,MathlibTest/linarith.lean,MathlibTest/notation3.lean,MathlibTest/propose.lean,MathlibTest/renameBvar.lean,MathlibTest/rewrites.lean,MathlibTest/ring.lean,MathlibTest/says.lean,MathlibTest/success_if_fail_with_msg.lean,MathlibTest/toAdditive.lean,lake-manifest.json	103	1	['sgouezel']	nobody	19-66181 19 days ago	19-66233 19 days ago *	0-0 0 seconds *
25069	erdOne author:erdOne	feat(EllipticCurve): rational points of singular nodal cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict awaiting-author	251/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Node.lean	3	14	['Multramate', 'acmepjz', 'chrisflav', 'erdOne', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	19-33414 19 days ago	19-33414 19 days ago	100-22151 100 days
25070	erdOne author:erdOne	feat(EllipticCurve): rational points on singular cuspidal cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict awaiting-author	123/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Cusp.lean	2	12	['Multramate', 'acmepjz', 'adamtopaz', 'erdOne', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	19-33413 19 days ago	19-33413 19 days ago	90-52970 90 days
29574	JarodUW author:JarodUW	Regular local rings are domains	We have added three new files in Mathlib/RingTheory/LocalRing * EmbeddingDimension.lean * LocalRingDimension.lean * RegularLocalRings.lean We have added two lemmas and an instance in Mathlib/RingTheory/LocalRing/RingHom/Basic.lean This work was done by Jarod Alper and Brian Nugent. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor merge-conflict	910/3	Mathlib.lean,Mathlib/RingTheory/LocalRing/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRing/LocalRingDimension.lean,Mathlib/RingTheory/LocalRing/RegularLocalRings.lean,Mathlib/RingTheory/LocalRing/RingHom/Basic.lean,lake-manifest.json	6	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	18-83255 18 days ago	18-83256 18 days ago	3-7974 3 days
26670	yu-yama author:yu-yama	feat(GroupExtension/Abelian): define `conjClassesEquivH1`	This PR continues the work from #21837. Original PR: https://github.com/leanprover-community/mathlib4/pull/21837	t-algebra merge-conflict awaiting-author label:t-algebra$	162/5	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Abelian.lean,Mathlib/GroupTheory/GroupExtension/Basic.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,docs/references.bib	5	3	['erdOne', 'github-actions', 'mathlib4-merge-conflict-bot', 'yu-yama']	erdOne assignee:erdOne	18-61707 18 days ago	18-61707 18 days ago	49-15167 49 days
26154	ADedecker author:ADedecker	refactor: add refactored APIs for algebraic filter bases	This PR continues the work from #18437. Original PR: https://github.com/leanprover-community/mathlib4/pull/18437	t-topology merge-conflict	651/0	Mathlib.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	5	3	['ADedecker', 'github-actions', 'mathlib4-merge-conflict-bot']	PatrickMassot assignee:PatrickMassot	18-57150 18 days ago	18-57151 18 days ago	87-79752 87 days
27024	grunweg author:grunweg	feat: Gram-Schmidt orthonormalisation for sections of a vector bundle	Add a parametrised version of Gram-Schmidt, for sections of a topological vector bundle with a bundle metric. This will be used to define orthonormal local frames. From the path towards geodesics and the Levi-Civita connection. Co-authored-by: Patrick Massot --- - [x] depends on: #27023 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict awaiting-author	279/11	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Topology/VectorBundle/GramSchmidtOrtho.lean,scripts/noshake.json	4	71	['faenuccio', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	18-47807 18 days ago	18-47808 18 days ago	28-73015 28 days
28580	kmill author:kmill	refactor: simplify implementation of `filter_upwards`	This PR makes a few changes to `filter_upwards`: - it uses `focus`, which prevents multiGoalLinter from ever blaming the tactics used inside its implementation - it constructs the whole proof syntax and elaborates it at once using `evalTactic` and `refine`, rather than using the lower-level TermElab API, which can lose track of goals - it's written in a way that doesn't require goals to be in some particular order This was motivated by some multiGoalLinter issues I ran into when working on https://github.com/leanprover/lean4/pull/9942 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-meta merge-conflict	14/16	Mathlib/Order/Filter/Defs.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	18-45766 18 days ago	18-45767 18 days ago	28-42873 28 days
29605	alreadydone author:alreadydone	experiment(Algebra): unbundle npow/zpow from Monoid/InvDivMonoid	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict label:t-algebra$	1527/1020	Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Category/MonCat/ForgetCorepresentable.lean,Mathlib/Algebra/Divisibility/Basic.lean,Mathlib/Algebra/Divisibility/Units.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/Power.lean,Mathlib/Algebra/Field/Rat.lean,Mathlib/Algebra/Group/Action/Basic.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Commute/Basic.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/Commute/Units.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Even.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Idempotent.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Irreducible/Lemmas.lean,Mathlib/Algebra/Group/Nat/Defs.lean,Mathlib/Algebra/Group/Nat/Hom.lean,Mathlib/Algebra/Group/NatPowAssoc.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/PUnit.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Semiconj/Basic.lean,Mathlib/Algebra/Group/Semiconj/Defs.lean,Mathlib/Algebra/Group/Semiconj/Units.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Subgroup/ZPowers/Basic.lean,Mathlib/Algebra/Group/Submonoid/BigOperators.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Support.lean,Mathlib/Algebra/Group/Torsion.lean,Mathlib/Algebra/Group/TransferInstance.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/ULift.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Commute.lean,Mathlib/Algebra/GroupWithZero/Conj.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Divisibility.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/GroupWithZero/Indicator.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Semiconj.lean,Mathlib/Algebra/GroupWithZero/ULift.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/GroupWithZero/Units/Lemmas.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/NoZeroSMulDivisors/Defs.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/BigOperators/Group/Multiset.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/List.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/Multiset.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Action.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/Finset.lean,Mathlib/Algebra/Order/Group/Lattice.lean,Mathlib/Algebra/Order/Group/Multiset.lean,Mathlib/Algebra/Order/Group/PosPart.lean,Mathlib/Algebra/Order/Group/Synonym.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean	162	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	18-36401 18 days ago	18-36402 18 days ago	0-2 2 seconds
29614	sgouezel author:sgouezel	Sg test4	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	2788/3328	.github/actionlint.yml,.github/workflows/nightly-docgen.yml,.github/workflows/nightly_detect_failure.yml,.github/workflows/report-grind-regressions.yml,Cache/Requests.lean,Mathlib.lean,Mathlib/Algebra/Algebra/RestrictScalars.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Field/Rat.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Order/Ring/Rat.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/Eval/SMul.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/Rat.lean,Mathlib/Algebra/Ring/Subring/Defs.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/CStarAlgebra/ApproximateUnit.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Analysis/CStarAlgebra/CompletelyPositiveMap.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/CStarAlgebra/ContinuousLinearMap.lean,Mathlib/Analysis/CStarAlgebra/ContinuousMap.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Defs.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/CStarAlgebra/Unitization.lean,Mathlib/Analysis/CStarAlgebra/lpSpace.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/CompMul.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/DiffContOnCl.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/LineDeriv/QuadraticMap.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/Calculus/SmoothSeries.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/Norm.lean,Mathlib/Analysis/Complex/Tietze.lean,Mathlib/Analysis/Fourier/FourierTransform.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Analysis/InnerProductSpace/Completion.lean,Mathlib/Analysis/InnerProductSpace/Defs.lean,Mathlib/Analysis/InnerProductSpace/MulOpposite.lean,Mathlib/Analysis/InnerProductSpace/OfNorm.lean,Mathlib/Analysis/InnerProductSpace/Orthonormal.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/ProdL2.lean,Mathlib/Analysis/InnerProductSpace/Projection/Minimal.lean,Mathlib/Analysis/InnerProductSpace/Subspace.lean,Mathlib/Analysis/InnerProductSpace/l2Space.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/Meromorphic/Basic.lean,Mathlib/Analysis/Normed/Affine/ContinuousAffineMap.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/Normed/Algebra/Unitization.lean,Mathlib/Analysis/Normed/Algebra/UnitizationL1.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Completion.lean,Mathlib/Analysis/Normed/Group/Constructions.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/Normed/Group/Hom.lean,Mathlib/Analysis/Normed/Group/Int.lean,Mathlib/Analysis/Normed/Group/Quotient.lean,Mathlib/Analysis/Normed/Group/Rat.lean,Mathlib/Analysis/Normed/Group/SemiNormedGrp.lean,Mathlib/Analysis/Normed/Group/Subgroup.lean,Mathlib/Analysis/Normed/Group/Submodule.lean,Mathlib/Analysis/Normed/Group/Ultra.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/Normed/Order/Hom/Basic.lean,Mathlib/Analysis/Normed/Order/Hom/Ultra.lean	251	1	['sgouezel']	nobody	17-47328 17 days ago	20-65970 20 days ago *	0-0 0 seconds *
27843	JovanGerb author:JovanGerb	chore(Algebra/Order/Sub/Defs): `@[gcongr low]` for `tsub_le_tsub`	This PR explicitly lowers the `gcongr` priority of `tsub_le_tsub`. It also golfs some proofs using this `gcongr` lemma --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	33/36	Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Degree.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Nat/Squarefree.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean,Mathlib/Topology/ContinuousMap/Polynomial.lean	14	10	['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	17-44045 17 days ago	17-44046 17 days ago	0-0 0 seconds
29741	JovanGerb author:JovanGerb	trying #28803 using lean#10178	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1111/718	.github/actionlint.yml,.github/workflows/nightly-docgen.yml,.github/workflows/nightly_detect_failure.yml,.github/workflows/report-grind-regressions.yml,Cache/Requests.lean,Mathlib.lean,Mathlib/Algebra/Field/Rat.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Order/Ring/Rat.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/Eval/SMul.lean,Mathlib/Algebra/Ring/Rat.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Data/DFinsupp/Notation.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Int/GCD.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Nat/GCD/Basic.lean,Mathlib/Data/Nat/GCD/BigOperators.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Data/Rat/Cast/Defs.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Data/Rat/Lemmas.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/Data/UInt.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/GroupTheory/Perm/Centralizer.lean,Mathlib/Init.lean,Mathlib/Lean/Expr/Rat.lean,Mathlib/Lean/Meta/CongrTheorems.lean,Mathlib/LinearAlgebra/PID.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Vandermonde.lean,Mathlib/Logic/Equiv/Prod.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/NumberTheory/Padics/PadicVal/Basic.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Defs/PartialOrder.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/Filter/Defs.lean,Mathlib/Probability/Distributions/Pareto.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Reassoc.lean,Mathlib/Tactic/CategoryTheory/Refs.lean,Mathlib/Tactic/DeriveFintype.lean,Mathlib/Tactic/FieldSimp.lean,Mathlib/Tactic/Hint.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm/Datatypes.lean,Mathlib/Tactic/Linter/DeprecatedModule.lean,Mathlib/Tactic/Linter/Header.lean,Mathlib/Tactic/Linter/Lint.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/NormNum/GCD.lean,Mathlib/Tactic/StacksAttribute.lean,Mathlib/Tactic/SuppressCompilation.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,Mathlib/Tactic/WLOG.lean,Mathlib/Testing/Plausible/Sampleable.lean,Mathlib/Util/Notation3.lean,Mathlib/Util/ParseCommand.lean,Mathlib/Util/Superscript.lean,MathlibTest/AssertExists.lean,MathlibTest/CalcQuestionMark.lean,MathlibTest/Change.lean,MathlibTest/DeprecateTo.lean,MathlibTest/FieldSimp.lean,MathlibTest/FindSyntax.lean,MathlibTest/LibrarySearch/basic.lean,MathlibTest/LibrarySearch/mathlib.lean,MathlibTest/LibrarySearch/observe.lean,MathlibTest/MinImports.lean,MathlibTest/RewriteSearch/Basic.lean,MathlibTest/RewriteSearch/Polynomial.lean,MathlibTest/StacksAttribute.lean,MathlibTest/Subsingleton.lean,MathlibTest/Use.lean,MathlibTest/Variable.lean,MathlibTest/hint.lean,MathlibTest/lift.lean,MathlibTest/linarith.lean,MathlibTest/notation3.lean,MathlibTest/propose.lean,MathlibTest/renameBvar.lean,MathlibTest/rewrites.lean,MathlibTest/ring.lean,MathlibTest/says.lean,MathlibTest/success_if_fail_with_msg.lean	105	n/a	['JovanGerb', 'leanprover-bot']	nobody	16-55952 16 days ago	unknown	unknown
29750	sgouezel author:sgouezel	Branch just before the class_abbrev core PR, just for benching	Branch just before the class_abbrev core PR, just for benching --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1041/684	.github/actionlint.yml,.github/workflows/nightly-docgen.yml,.github/workflows/nightly_detect_failure.yml,.github/workflows/report-grind-regressions.yml,Cache/Requests.lean,Mathlib.lean,Mathlib/Algebra/Field/Rat.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Order/Ring/Rat.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/Eval/SMul.lean,Mathlib/Algebra/Ring/Rat.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Data/DFinsupp/Notation.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Int/GCD.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Nat/GCD/Basic.lean,Mathlib/Data/Nat/GCD/BigOperators.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Data/Rat/Cast/Defs.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Data/Rat/Lemmas.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/Data/UInt.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/GroupTheory/Perm/Centralizer.lean,Mathlib/Init.lean,Mathlib/Lean/Expr/Rat.lean,Mathlib/LinearAlgebra/PID.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Vandermonde.lean,Mathlib/Logic/Equiv/Prod.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/NumberTheory/Padics/PadicVal/Basic.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Defs/PartialOrder.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/Filter/Defs.lean,Mathlib/Probability/Distributions/Pareto.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Reassoc.lean,Mathlib/Tactic/CategoryTheory/Refs.lean,Mathlib/Tactic/DeriveFintype.lean,Mathlib/Tactic/FieldSimp.lean,Mathlib/Tactic/Hint.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm/Datatypes.lean,Mathlib/Tactic/Linter/DeprecatedModule.lean,Mathlib/Tactic/Linter/Header.lean,Mathlib/Tactic/Linter/Lint.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/NormNum/GCD.lean,Mathlib/Tactic/StacksAttribute.lean,Mathlib/Tactic/SuppressCompilation.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,Mathlib/Tactic/WLOG.lean,Mathlib/Testing/Plausible/Sampleable.lean,Mathlib/Util/Notation3.lean,Mathlib/Util/ParseCommand.lean,Mathlib/Util/Superscript.lean,MathlibTest/AssertExists.lean,MathlibTest/CalcQuestionMark.lean,MathlibTest/Change.lean,MathlibTest/DeprecateTo.lean,MathlibTest/FieldSimp.lean,MathlibTest/FindSyntax.lean,MathlibTest/LibrarySearch/basic.lean,MathlibTest/LibrarySearch/mathlib.lean,MathlibTest/LibrarySearch/observe.lean,MathlibTest/MinImports.lean,MathlibTest/RewriteSearch/Basic.lean,MathlibTest/RewriteSearch/Polynomial.lean,MathlibTest/StacksAttribute.lean,MathlibTest/Subsingleton.lean,MathlibTest/Use.lean,MathlibTest/Variable.lean,MathlibTest/hint.lean,MathlibTest/lift.lean,MathlibTest/linarith.lean,MathlibTest/notation3.lean,MathlibTest/propose.lean,MathlibTest/renameBvar.lean,MathlibTest/rewrites.lean,MathlibTest/ring.lean,MathlibTest/says.lean,MathlibTest/success_if_fail_with_msg.lean,MathlibTest/toAdditive.lean,lake-manifest.json,lakefile.lean,lean-toolchain	101	1	['sgouezel']	nobody	16-42554 16 days ago	16-42613 16 days ago *	0-0 0 seconds *
26890	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution) : more API for `DayFunctor`	We provide some lemmas that helps characterizing the monoidal structure on `DayFunctor`, they are special cases of the lemmas for `LawfulDayConvolutionMonoidalCategoryStruct`. --- - [ ] depends on: #26824 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	1372/19	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean	4	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-20942 16 days ago	unknown	unknown
7125	eric-wieser author:eric-wieser	feat: additive monoid structure via biproducts	I suspect I'm missing a trick with these transport lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-CI merge-conflict WIP	237/0	Mathlib/CategoryTheory/Limits/Skeleton.lean	1	3	['alreadydone', 'eric-wieser', 'mathlib4-merge-conflict-bot']	nobody	16-18871 16 days ago	16-18872 16 days ago	0-0 0 seconds
28769	chrisflav author:chrisflav	feat(RingTheory/Extension/Cotangent): presentation is submersive if `I/I²` has a suitable basis	Let `P` be a presentation of an algebra with kernel `I`. We show that if `I/I²` has a basis given by the images of the relations and the module of Kaehler differentials has a basis given by the differentials of the free generators (those that don't appear in the Jacobian matrix), then `P` is submersive. We will later deduce from this a presentation-independent characterization of standard smooth algebras. From Pi1. --- - [ ] depends on: #28767 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import merge-conflict	917/561	Mathlib.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/LinearMap.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/LinearAlgebra/Basis/Exact.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Finsupp/Span.lean,Mathlib/LinearAlgebra/Finsupp/Supported.lean,Mathlib/LinearAlgebra/Finsupp/VectorSpace.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/RingTheory/Extension/Cotangent/Basic.lean,Mathlib/RingTheory/Extension/Cotangent/Free.lean,Mathlib/RingTheory/Extension/Presentation/Submersive.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean	19	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	15-59660 15 days ago	15-59662 15 days ago	0-655 10 minutes
25138	chrisflav author:chrisflav	chore(RingTheory/Ideal): make `RingHom.ker` take a `RingHom` instead of `RingHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	105/95	Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/Algebra/Category/CommAlgCat/FiniteType.lean,Mathlib/Algebra/Polynomial/Module/AEval.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/FieldTheory/Minpoly/Field.lean,Mathlib/LinearAlgebra/TensorProduct/RightExactness.lean,Mathlib/RingTheory/Algebraic/Basic.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Localization/Algebra.lean,Mathlib/RingTheory/Nilpotent/Lemmas.lean,Mathlib/RingTheory/NoetherNormalization.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	18	6	['chrisflav', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	15-36299 15 days ago	15-36300 15 days ago	16-338 16 days
26983	mans0954 author:mans0954	feat(Order/LatticeElements): distributive, standard and neutral elements of a lattice	Defines distributive, standard and neutral elements of a lattice and gives equivalent conditions. --- - [ ] depends on: #26836 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	287/0	Mathlib.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/LatticeElements.lean,docs/references.bib	4	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	14-24331 14 days ago	14-24332 14 days ago	0-1136 18 minutes
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 merge-conflict	2/3	Mathlib/Data/Fin/Embedding.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	12-49443 12 days ago	12-49444 12 days ago	18-38918 18 days
27972	smmercuri author:smmercuri	refactor: make `Valuation.Completion` a `def` and refactor more of `AdicValuation.lean`	This PR continues the work from #24590. Original PR: https://github.com/leanprover-community/mathlib4/pull/24590	t-algebra t-number-theory merge-conflict WIP label:t-algebra$	186/93	Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	5	7	['github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'smmercuri']	nobody	12-12760 12 days ago	12-12761 12 days ago	3-83441 3 days
28908	joelriou author:joelriou	feat(CategoryTheory): Pullback functors on `Over` categories in `Type` have right adjoints	Given a map `f : E → B`, in order to show that `Over.pullback f : Over B ⥤ Over E` commutes with colimits, we show that it admits a right adjoint. In order to do that, we first construct a functor `overPullback f : Over B ⥤ Over E` whose definition involves explicit types rather than categorical pullbacks, and we define its right adjoint `overPushforward f : Over E ⥤ Over B`. (In a future PR, it will be shown that the `Over.pullback` also commutes with colimits in categories of presheaves, and hopefully this will be used in the construction of the Quillen model category structure on simplicial sets.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict awaiting-author	103/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Types/OverPullback.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean	3	10	['emilyriehl', 'github-actions', 'joelriou', 'mathlib4-merge-conflict-bot', 'robin-carlier', 'sinhp']	nobody	11-28436 11 days ago	11-28436 11 days ago	13-55990 13 days
25480	ocfnash author:ocfnash	feat: define a concrete model of the `𝔤₂` root system	This is a bit of an experiment to test API but it should also make it easier to prove some properties of `𝔤₂`. --- - [x] depends on: #25477 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict WIP label:t-algebra$	120/15	Mathlib/LinearAlgebra/RootSystem/Defs.lean,Mathlib/LinearAlgebra/RootSystem/Finite/G2.lean,Mathlib/LinearAlgebra/RootSystem/Reduced.lean	3	9	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'ocfnash']	nobody	9-70636 9 days ago	9-70637 9 days ago	0-1 1 second
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 merge-conflict	61/68	Mathlib/GroupTheory/Perm/Fin.lean	1	10	['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'tb65536']	nobody	9-68747 9 days ago	9-68748 9 days ago	20-39203 20 days
29430	RemyDegenne author:RemyDegenne	refactor(Probability): change stopping times to take values in `WithTop`	This PR changes stopping times to have type `Ω → WithTop ι` instead of `Ω → ι`. Previously, a stopping time for a filtration indexed by Nat had to have value in Nat. That's not representative of the way stopping times are used in probability. A typical stopping time is the first time at which we see a head in an infinite sequence of coin flips. That time could be infinite (although it is almost surely finite). We can't represent it with a `Ω → Nat` stopping time: if we choose an arbitrary value in Nat for the event that it is infinite, we destroy the stopping time property. We faced that issue in the `BorelCantelli` file, in which we avoided such a possibly infinite stopping time by introducing a sequence of bounded stopping times. We had to prove additional lemmas about them since we could not directly use the API for stopped processes. With the new type, that file is greatly simplified as the API is directly usable, and we can write the proof as we would on paper. The issue with the previous stopping time implementation was noted in [Ying and Degenne, A Formalization of Doob’s Martingale Convergence Theorems in mathlib, CPP 2023, https://dl.acm.org/doi/pdf/10.1145/3573105.3575675]. Other changes: - the sigma-algebra generated by a stopping time is now a sub-sigma algebra by definition - `measurableSet_eq_stopping_time` is generalized and the now useless `measurableSet_eq_stopping_time_of_countable` is removed - `hitting` is renamed to `hittingBtwn` - a new `hittingAfter` is introduced and used in the Borel-Cantelli proof. That proof is now much simpler since we can use a stopped process as intended instead of going around the limitations of the previous stopping time implementation. --- - [ ] depends on: #29466 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict WIP	1090/556	Mathlib/Probability/Martingale/Basic.lean,Mathlib/Probability/Martingale/BorelCantelli.lean,Mathlib/Probability/Martingale/OptionalSampling.lean,Mathlib/Probability/Martingale/OptionalStopping.lean,Mathlib/Probability/Martingale/Upcrossing.lean,Mathlib/Probability/Process/HittingTime.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/Topology/Order/WithTop.lean	8	11	['RemyDegenne', 'github-actions', 'kex-y', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	9-68745 9 days ago	9-68746 9 days ago	0-1 1 second
29829	vihdzp author:vihdzp	draft: more stuff on `standardPart`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	549/10	Mathlib.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/Archimedean/Hom.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Ring/Archimedean.lean,Mathlib/Data/Real/StandardPart.lean,Mathlib/Order/Quotient.lean	7	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	9-65187 9 days ago	9-65188 9 days ago	0-0 0 seconds
29118	edegeltje author:edegeltje	chore(CategoryTheory): align `refl` and `rfl` declarations in CategoryTheory	In general, theorems and declarations named `refl` take an explicit argument and prove/construct something of type `r X X`, whereas the `rfl` versions take the argument implicitly. This PR adds missing `rfl` declarations to the CategoryTheory library, and makes sure `Equivalence.refl` takes an explicit argument. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	will-close-soon t-category-theory merge-conflict awaiting-author	37/18	Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Enriched/Ordinary/Basic.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/IsConnected.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Retract.lean,Mathlib/CategoryTheory/Shift/Adjunction.lean,Mathlib/CategoryTheory/Sums/Products.lean,Mathlib/CategoryTheory/Triangulated/Adjunction.lean,Mathlib/RingTheory/Morita/Basic.lean	11	7	['Ruben-VandeVelde', 'edegeltje', 'github-actions', 'joelriou', 'mathlib4-merge-conflict-bot']	TwoFX assignee:TwoFX	8-79129 8 days ago	8-79130 8 days ago	11-13051 11 days
29482	mattrobball author:mattrobball	refactor (Algebra.Group.Defs): add npow/zpow/nsmul/zsmul as fields of new parents classes	Adds ZPow G class and makes this a parent to DivInvMonoid and the corresponding additive versions. Updates zpow/zsmul operations to use the integrated power/scalar multiplication syntax. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	177/122	Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Ring/Unbundled/Basic.lean,Mathlib/Algebra/Ring/ULift.lean,Mathlib/Data/BitVec.lean,Mathlib/Tactic/Abel.lean,Mathlib/Tactic/NormNum/Pow.lean	21	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	8-79005 8 days ago	8-79006 8 days ago	0-0 0 seconds
29657	jcreinhold author:jcreinhold	feat(CategoryTheory/MarkovCategory): add Markov categories	This PR adds Markov categories to the category theory library. A Markov category is a symmetric monoidal category where every object has canonical copy and delete morphisms that form commutative comonoids. ## What this gives mathlib In a Markov category, morphisms model probabilistic processes. The copy morphism `X → X ⊗ X` creates perfect correlation (both outputs always equal). The delete morphism `X → I` marginalizes (sums/integrates out variables). This structure captures probability theory categorically. The same theorem proves results for: - Finite probability (stochastic matrices) - Measure theory (Markov kernels) - Kleisli categories of probability monads Fritz (2020) used this to prove categorical versions of Fisher-Neyman, Basu's theorem, and other core statistics results. ## Implementation - `MarkovCategory`: Extends `SymmetricCategory` with canonical comonoid structure - `copyMor X : X ⟶ X ⊗ X` and `delMor X : X ⟶ I` for each object - Coherence axioms: commutativity, counitality, coassociativity - Compatibility with tensor products Key design point: The comonoid structure is canonical (fields of the typeclass), not chosen. This matches the probability interpretation where there's exactly one way to copy/marginalize. ## Examples included 1. Cartesian categories: Every cartesian monoidal category forms a Markov category where copy is the diagonal `x ↦ (x,x)` and delete is the terminal morphism. All morphisms are deterministic. 2. FinStoch: Objects are finite types. Morphisms are stochastic matrices (rows sum to 1). This models finite probability spaces with the usual matrix multiplication for composition. ## Scope and review notes This PR provides the basic structure only. Future PRs would add: - Conditional independence - Sufficient statistics - Connection to measure-theoretic probability - More examples (Kleisli categories, Gaussian categories) I'm neither an expert in this material nor in Lean; I've only read a few papers on Markov categories and have gone through tutorial material in Lean. Please review for mathematical correctness and idiomatic Lean. I kept this PR small to check if mathlib wants this addition and to ensure it meets repository standards. ## Why add this now Markov categories provide a useful abstraction level for probability in type theory. Adding it to mathlib enables future work on categorical probability and statistics. In particular, I'm working on a probabilistic programming library and would like to write some proofs using these constructs. ## References - Fritz, T. (2020). [A synthetic approach to Markov kernels, conditional independence and theorems on sufficient statistics](https://arxiv.org/abs/1908.07021). Advances in Mathematics, 370, 107239. - Cho, K., & Jacobs, B. (2019). [Disintegration and Bayesian inversion via string diagrams](https://arxiv.org/abs/1709.00322). Mathematical Structures in Computer Science, 29(7), 938-971. --- All definitions include docstrings. The PR has tests for the core functionality. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory merge-conflict awaiting-author	2414/7	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Monad/Basic.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Basic.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Deterministic.lean,Mathlib/CategoryTheory/MarkovCategory/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/Cartesian.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Braided.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/CopyDiscard.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Markov.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Bimon_.lean,Mathlib/CategoryTheory/Monoidal/CommComon_.lean,Mathlib/CategoryTheory/Monoidal/Comon_.lean,MathlibTest/CategoryTheory/MarkovCategory.lean,docs/references.bib	16	28	['github-actions', 'jcreinhold', 'joelriou', 'mathlib4-merge-conflict-bot']	nobody	8-44937 8 days ago	8-44938 8 days ago	0-0 0 seconds
29390	harahu author:harahu	doc(Computability): documentation improvement suggestions from Junie Pro (LLM)	I'm still in the process of self-reviewing the details here, but please shout out if there are any changes you don't like. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability merge-conflict	235/237	.gitignore,Mathlib/Computability/Ackermann.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean,Mathlib/Computability/ContextFreeGrammar.lean,Mathlib/Computability/DFA.lean,Mathlib/Computability/Encoding.lean,Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/MyhillNerode.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/PostTuringMachine.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Computability/TMComputable.lean,Mathlib/Computability/TMConfig.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Computability/Tape.lean,Mathlib/Computability/TuringDegree.lean,Mathlib/Computability/TuringMachine.lean	22	9	['github-actions', 'harahu', 'mathlib4-merge-conflict-bot']	nobody	7-85542 7 days ago	7-85543 7 days ago	0-0 0 seconds
21847	smmercuri author:smmercuri	feat: `v.adicCompletionIntegers K` is compact	--- - [x] depends on: #21844 - [x] depends on: #24872 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-number-theory merge-conflict WIP	459/4	Mathlib.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/UniformRing.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	11	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	7-61534 7 days ago	59-56575 1 month ago	0-0 0 seconds
27829	dupuisf author:dupuisf	feat: modify `cfc_tac` to use `grind`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	60/50	Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/NonUnital.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/PosPart/Basic.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean,Mathlib/Tactic/ContinuousFunctionalCalculus.lean	9	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	7-46848 7 days ago	7-46849 7 days ago	0-1 1 second
21950	erdOne author:erdOne	feat(NumberTheory/Padics): the completion of `ℚ` at a finite place is `ℚ_[p]`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory merge-conflict	253/1	Mathlib.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroMulInt.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	7	33	['Ruben-VandeVelde', 'erdOne', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky', 'smmercuri', 'xroblot']	nobody	7-43857 7 days ago	88-43794 2 months ago	79-1228 79 days
27668	IvanRenison author:IvanRenison	feat(Analysis/InnerProductSpace): define outer product of linear maps	Co-authored-by: Jam Kabeer Ali Khan --- I'm not completely sure if this is a good addition or not, and also, I was not sure if to call the definition `outerProduct` or only `outer`. - [ ] depends on: #28350 - [ ] depends on: #28344 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	205/8	Mathlib.lean,Mathlib/Algebra/Module/LinearMap/Lemmas.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/InnerProductSpace/Trace.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	10	70	['IvanRenison', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen']	themathqueen assignee:themathqueen	6-45687 6 days ago	6-45688 6 days ago	2-57966 2 days
12278	Rida-Hamadani author:Rida-Hamadani	feat(Combinatorics/SimpleGraph): Provide iff statements for distance equal and greater than 2	I need these lemmas to prove that Moore graphs of girth 5 are strongly regular. --- - [x] depends on: #11945 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict awaiting-author	76/0	Mathlib/Combinatorics/SimpleGraph/Metric.lean	1	3	['github-actions', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	nobody	5-45819 5 days ago	5-45820 5 days ago	1-68738 1 day
27353	themathqueen author:themathqueen	chore(LinearAlgebra/TensorProduct/Basic): more semi-linearizing	Co-authored-by: @ADedecker --- This continues the work from: #27310 (original PR: #24208). - [x] depends on: #27467 - [x] depends on: #27288 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	230/187	Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/LinearAlgebra/BilinearForm/TensorProduct.lean,Mathlib/LinearAlgebra/Coevaluation.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/LinearAlgebra/DirectSum/TensorProduct.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/LinearAlgebra/Trace.lean,Mathlib/RepresentationTheory/Rep.lean,Mathlib/RingTheory/Coalgebra/Hom.lean	15	15	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen']	nobody	5-35834 5 days ago	5-36873 5 days ago	2-62342 2 days
28001	daefigueroa author:daefigueroa	feat(Dynamics): add results on topologically transitive flows	We define topological transitivity for a flow and show that a factor of a topologically transitive flow is topologically transitive. --- This contribution was created as part of the Utrecht Summerschool "Formalizing Mathematics in Lean" in July 2025. - [ ] depends on: #28000 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-dynamics merge-conflict	68/3	Mathlib.lean,Mathlib/Dynamics/Flow.lean,Mathlib/Dynamics/Transitive.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-17375 5 days ago	5-17376 5 days ago	0-4581 1 hour
29092	zhuyizheng author:zhuyizheng	feat(MeasureTheory): add absolutely continuous functions, FTC and integration by parts	Add the ε-δ definition of absolutely continuous functions on a closed interval in ℝ. Prove Fundamental Theorem of Calculus and integration by parts for absolutely continuous functions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict awaiting-author	1376/0	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/MeasureTheory/Function/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/AbsContFunc.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/DerivIntegrable.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/LebesgueDifferetiationThm.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean	7	6	['Ruben-VandeVelde', 'fpvandoorn', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	5-17005 5 days ago	5-17006 5 days ago	0-24361 6 hours
26300	igorkhavkine author:igorkhavkine	feat(Analysis/Calculus/FDeriv): continuous differentiability from continuous partial derivatives on an open domain in a product space	If a function `f : E × F → G` is continuously differentiable, then its partial derivatives along `E` and `F` are also continuous. The non-trivial converse implication holds when the partial derivatives are continuous on an open domain, and they can be added together to give the total derivative of `f`. See this [#mathlib4 > Partial derivatives @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Partial.20derivatives/near/520995477) and the containing thread for some discussion. The PR creates a new import (`Mathlib.Analysis.Calculus.FDeriv.Partial`), where other results about partial derivatives could go in the future. --- this is the migration of #25304 to the PR-from-fork workflow - [x] depends on: #25564 - [x] depends on: #26273 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict awaiting-author WIP	497/0	Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean,Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean	4	20	['YaelDillies', 'agjftucker', 'github-actions', 'igorkhavkine', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	4-67652 4 days ago	4-67653 4 days ago	50-22679 50 days
19860	YaelDillies author:YaelDillies	refactor: review the `simps` projections of `OneHom`, `MulHom`, `MonoidHom`	Make `simps` generate `coe_concreteHom` rather than`concreteHom_apply`. From FLT --- In fact, I would love to have both the `coe_` and `_apply` projections simultaneously and also to not have to specify ` simps (config := .asFn))` every single time we want to generate the `coe_` projection, but `simps ` seems to not be able to do that? cc @fpvandoorn I must say, after four years of working on mathlib, I still don't understand how one is supposed to use `simps`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	104/119	Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/WithOne/Basic.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Module/End.lean,Mathlib/GroupTheory/NoncommCoprod.lean	8	11	['fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	4-59316 4 days ago	4-59317 4 days ago	0-17 17 seconds
21035	mattrobball author:mattrobball	draft	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	3/3	Mathlib/RingTheory/Kaehler/JacobiZariski.lean	1	5	['github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'mattrobball']	nobody	4-59315 4 days ago	4-59315 4 days ago	0-0 0 seconds
26178	ppls-nd-prs author:ppls-nd-prs	feat(CategoryTheory/Limits): Fubini for products	We show that the product of products is a product indexed by the sigma type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory merge-conflict awaiting-author	17/0	Mathlib/CategoryTheory/Limits/Shapes/Products.lean	1	6	['chrisflav', 'github-actions', 'leanprover-community-bot-assistant', 'ppls-nd-prs', 'robin-carlier']	nobody	4-59150 4 days ago	90-78256 2 months ago	0-47665 13 hours
30066	Vierkantor author:Vierkantor	for benchmarking: No cancellation inheritance for concrete subobjects	Remove Is[Left,Right]Cancel[Add,Mul][Zero,] instances that can be inferred automatically. This is intended mostly to be benchmarked, for comparison with #27992 which keeps these instances. Our hypothesis is that this commit will see performance regressions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	47/27	Mathlib.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/AlgebraicTopology/FundamentalGroupoid/Basic.lean	6	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	4-53130 4 days ago	4-53130 4 days ago	0-0 0 seconds
27214	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): Categorical pullback squares	In this PR, we give the definition and first basic properties of categorical pullback squares. Using our previous work on `CategoricalPullback`, we define a typeclass `CatPullbackSquare T L R B` that asserts that a given `CatCommSq T L R B` is a "pullback square": this is the data of a chosen adjoint equivalence to the canonical functor from the top left corner of the square to the categorical pulback of its leg. Using this equivalence, be derive a universal property for functors from `X`with values in the top left corner of the square: they are equivalent to `CatCommSqOver R B X`, the category of categorical commutative squares over the cospan `R, B` with top left corner `X`. We prove some coherence result for this equivalence, most notably an isomorphism that, given `S : CatCommSqOver R B X`, bundles the two commutative triangles formed by the induced functor, and the coherence between the squares that these isomorphisms satisfy: this is conveniently bundled in the data of a single isomorphisms of `CatCommSqOver R B X`. Finally, we provide a `Prop`-class `IsCatPullbackSquare` that merely asserts the existence (via `Nonempty`) of the relevant data: we show that it is tautotogically equivalent to the propopsition that the canonical functor to the categorical pullback is an equivalence. --- - [ ] depends on: #26679 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	786/1	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-33939 4 days ago	4-33940 4 days ago	0-5521 1 hour
28807	alreadydone author:alreadydone	experiment: Submodule with SMul only (no Semiring)	--- `SubMulAction` already takes `SMul`. TODO: relax typeclass requirements of `Ideal` as well. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	bench-after-CI t-algebra awaiting-CI merge-conflict label:t-algebra$	54/42	Mathlib/Algebra/Module/Submodule/Defs.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	3-83373 3 days ago	3-83373 3 days ago	0-0 0 seconds
25930	loefflerd author:loefflerd	WIP towards Hecke bound for q-expansions	The aim of this PR is to prove various statements about boundedness properties of modular forms. --- - [x] depends on: #29640 This PR continues the work from #24962.	migrated-from-branch large-import t-number-theory merge-conflict WIP	710/143	Mathlib.lean,Mathlib/NumberTheory/ModularForms/Bounds.lean,Mathlib/NumberTheory/ModularForms/CongruenceSubgroups.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/IsBoundedAtImInfty.lean,Mathlib/NumberTheory/ModularForms/Identities.lean,Mathlib/NumberTheory/ModularForms/LevelOne.lean,Mathlib/NumberTheory/ModularForms/Petersson.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean	8	9	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-61352 3 days ago	3-61353 3 days ago	0-77 1 minute
26466	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/Augmented): the canonical monoid object in the augmented simplex category	Show that in the augmented simplex category, `⦋0⦌` is an internal monoid object. Future work will show that this is in fact the universal monoid object: for any monoidal category `C`, evaluation at `⦋0⦌` induces an equivalence of categories between `Mon_ C` and the category of monoidal functors from `AugmentedSimplexCategory` to `C`. The resulting augmented cosimplicial object one gets from this construction is sometimes called the "monoidal bar construction" attached to a monoid. This PR was split from #25743. --- - [ ] depends on: #25743 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology t-category-theory merge-conflict	571/111	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Mon_.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Monoidal.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean	6	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-53341 3 days ago	3-53343 3 days ago	0-1708 28 minutes
28074	grunweg author:grunweg	Isbilinearmap	TODO see if it builds, move everything to the right place, add docs. update Pr description - written by Patrick, part of #26221 (and prereq for #28056) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	64/0	Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/LinearAlgebra/BilinearMap.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	3-19708 3 days ago	3-19709 3 days ago	0-2 2 seconds
26578	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Pullbacks/Categorical/CatCospanTransform): adjunctions of categorical cospans	We build upon the bicategory-like structure developed in #26447 and #26412 to define the notion of adjunctions of categorical cospans. This is a structure encoding the data of two `CatCospanTransform`s, along with the usual unit and counit morphisms as part of the data, satisfying the usual left and right triangle identities. We provide basic API for these, such as extracting adjunctions between individual components. We also provide a proof that the notion satisfies a "coherence": with our chosen constructor, the forward direction of the structure `CatCommSq` on the left adjoints correspond to the inverse of the square for the right adjoints through `mateEquiv`. These adjunctions will be used as a substrate for defining equivalences of categorical cospans in a future PR: such an equivalence will be a structure extending a `CatCospanAdjunction` with isomorphisms data on the unit and co-unit (we will however provide alternative constructors in sync with the constructor for equivalences of categories). --- - [x] depends on: #26447 - [x] depends on: #26547 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict	205/0	Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean	1	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-56566 2 days ago	2-59538 2 days ago	0-625 10 minutes
27970	smmercuri author:smmercuri	feat: collections of distinct infinite places contain values that diverge around 1	This PR continues the work from #22147. Original PR: https://github.com/leanprover-community/mathlib4/pull/22147 --- - [ ] depends on: #27969	FLT t-algebra t-number-theory merge-conflict WIP label:t-algebra$	461/44	Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Analysis/AbsoluteValue/Equivalence.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean,Mathlib/NumberTheory/Ostrowski.lean	4	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-54820 2 days ago	2-54823 2 days ago	0-2827 47 minutes
22089	sgouezel author:sgouezel	feat: composing a continuous multilinear map with continuous linear maps is analytic in both variables	Also prove that the composition of continuously polynomial functions is continuously polynomial. --- - [x] depends on: #22102 - [x] depends on: #22789 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict awaiting-author	277/80	Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Data/Multiset/DershowitzManna.lean,Mathlib/Order/KrullDimension.lean	5	14	['github-actions', 'grunweg', 'loefflerd', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel', 'urkud']	loefflerd assignee:loefflerd	2-53563 2 days ago	2-71505 2 days ago	122-9676 122 days
28962	grunweg author:grunweg	chore: enable the flexible linter in mathlib	Let's see what has regressed in the mean-time, and how many exceptions remain. We're somewhat liberal with disabling the linter when this doesn't make sense: let's see how close we are. --- TODO: should the `bicategory` tactic be considered flexible/normalising? - [x] depends on: #29027 - [x] depends on: #29174 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	389/133	Archive/Arithcc.lean,Archive/Examples/Eisenstein.lean,Archive/Examples/IfNormalization/Result.lean,Archive/Imo/Imo1997Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2019Q4.lean,Archive/Imo/Imo2024Q5.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Counterexamples/MapFloor.lean,Counterexamples/Phillips.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/Category/ModuleCat/Subobject.lean,Mathlib/Algebra/Field/GeomSum.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Homology/Augment.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/Algebra/LinearRecurrence.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicGeometry/Gluing.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicGeometry/ValuativeCriterion.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/Analysis/AbsoluteValue/Equivalence.lean,Mathlib/Analysis/Analytic/Binomial.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/CStarAlgebra/SpecialFunctions/PosPart.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/FDeriv/Pow.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Complex/Arg.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/ValueDistribution/FirstMainTheorem.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/InnerProductSpace/Rayleigh.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/Meromorphic/NormalForm.lean,Mathlib/Analysis/Meromorphic/TrailingCoefficient.lean,Mathlib/Analysis/NormedSpace/MultipliableUniformlyOn.lean,Mathlib/Analysis/ODE/Gronwall.lean,Mathlib/Analysis/Real/Pi/Irrational.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/PosPart/Basic.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/IntegralRepresentation.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/Analysis/SpecialFunctions/Log/PosLog.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSq.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSqIntegral.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Complex.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Inverse.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Mate.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Dialectica/Monoidal.lean,Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/CategoryTheory/Limits/Constructions/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Grothendieck.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean,Mathlib/CategoryTheory/Products/Basic.lean,Mathlib/CategoryTheory/SmallObject/Construction.lean,Mathlib/Combinatorics/Additive/Corner/Roth.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/Combinatorics/Additive/SmallTripling.lean,Mathlib/Combinatorics/Additive/VerySmallDoubling.lean,Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SetFamily/KruskalKatona.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/Primrec.lean,Mathlib/Computability/TMConfig.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Control/EquivFunctor/Instances.lean,Mathlib/Data/Bool/Count.lean,Mathlib/Data/ENNReal/BigOperators.lean	168	19	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-41354 2 days ago	2-41355 2 days ago	3-66115 3 days
30081	adomani author:adomani	test: remove deprecated declarations in Archive and Counterexamples	Checks that the latest modifications in #30070 still work and allow the removal of deprecated declarations in `Archive` and `Counterexamples`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	test-ci merge-conflict	667/0	.github/workflows/remove_deprecated_decls.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/CommandRanges.lean,Mathlib/Tactic/Linter/FindDeprecations.lean,MathlibTest/FindDeprecations.lean,scripts/README.md,scripts/remove_deprecated_decls_CI.sh	8	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	2-40435 2 days ago	2-40436 2 days ago	0-0 0 seconds
27882	euprunin author:euprunin	chore: golf using `grind [Nat.cast_*]`		merge-conflict	6/18	Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/EulerSineProd.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/RingTheory/ZMod/UnitsCyclic.lean	4	12	['github-actions', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	urkud assignee:urkud	1-62590 1 day ago	1-62591 1 day ago	60-4294 60 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 merge-conflict	148/2	Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Maps/Basic.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	ADedecker assignee:ADedecker	1-59010 1 day ago	1-59011 1 day ago	134-68375 134 days
26115	grunweg author:grunweg	WIP/proof of concept,feat: the inverse function theorem for manifolds	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict WIP	348/0	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Geometry/Manifold/InverseFunctionTheorem.lean,Mathlib/Topology/PartialHomeomorph.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	1-58453 1 day ago	1-58454 1 day ago	0-0 0 seconds
28243	robin-carlier author:robin-carlier	chore(CategoryTheory/Bicategory): move some `eqToHom` lemmas	The file `CategoryTheory/Bicategory/EqToHom.lean` introduced in #28242 is a more suitable hom for the lemmas `CategoryTheory.Bicategory.whiskerLeft_eqToHom` and `CategoryTheory.Bicategory.eqToHom_whiskerRight` than the current `CategoryTheory/Bicategory/Strict.lean`. We move these lemmas to the new file, and make `CategoryTheory/Bicategory/Strict` import these lemmas. --- - [ ] depends on: #28242 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	165/23	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/EqToHom.lean,Mathlib/CategoryTheory/Bicategory/Strict.lean,Mathlib/CategoryTheory/EqToHom.lean,scripts/noshake.json	5	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier']	nobody	1-25079 1 day ago	1-25080 1 day ago	0-9063 2 hours
29012	grunweg author:grunweg	chore: reduce `Topology` imports in `Data`	Move Data.Real.Sqrt to Analysis. --- - [ ] depends on: #28966 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed merge-conflict	25/21	Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1960Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Sensitivity.lean,Mathlib.lean,Mathlib/Algebra/Star/CHSH.lean,Mathlib/Analysis/Complex/Norm.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Module/Ball/Homeomorph.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/Real/Sqrt.lean,Mathlib/Data/Rat/NatSqrt/Real.lean,Mathlib/Data/Real/CompleteField.lean,Mathlib/Data/Real/Irrational.lean,Mathlib/Data/Real/StarOrdered.lean,Mathlib/NumberTheory/Zsqrtd/ToReal.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/NormNum/RealSqrt.lean,MathlibTest/positivity.lean	20	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-51879 14 hours ago	0-51880 14 hours ago	6-26396 6 days
26601	yuma-mizuno author:yuma-mizuno	feat(CategoryTheory): make `Functor.comp` irreducible	[#mathlib4 > Functor identity `𝟭 _ ⋙ F = F` is definitional equality](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Functor.20identity.20.60.F0.9D.9F.AD.20_.20.E2.8B.99.20F.20.3D.20F.60.20is.20definitional.20equality/with/523978659) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	514/261	Mathlib/AlgebraicTopology/DoldKan/Compatibility.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/CatCommSq.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Category/RelCat.lean,Mathlib/CategoryTheory/Category/ULift.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Discrete/Basic.lean,Mathlib/CategoryTheory/EqToHom.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/CategoryTheory/Functor/Category.lean,Mathlib/CategoryTheory/Functor/Const.lean,Mathlib/CategoryTheory/Functor/Currying.lean,Mathlib/CategoryTheory/Functor/CurryingThree.lean,Mathlib/CategoryTheory/Functor/FullyFaithful.lean,Mathlib/CategoryTheory/Functor/Functorial.lean,Mathlib/CategoryTheory/Functor/ReflectsIso/Basic.lean,Mathlib/CategoryTheory/Functor/TwoSquare.lean,Mathlib/CategoryTheory/Groupoid/FreeGroupoid.lean,Mathlib/CategoryTheory/Join/Basic.lean,Mathlib/CategoryTheory/Limits/Cones.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/ObjectProperty/FullSubcategory.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/PathCategory/Basic.lean,Mathlib/CategoryTheory/Pi/Basic.lean,Mathlib/CategoryTheory/Products/Associator.lean,Mathlib/CategoryTheory/Products/Basic.lean,Mathlib/CategoryTheory/Quotient.lean,Mathlib/CategoryTheory/Sigma/Basic.lean,Mathlib/CategoryTheory/Whiskering.lean,Mathlib/CategoryTheory/Yoneda.lean	34	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	0-39680 11 hours ago	0-39681 11 hours ago	0-10 10 seconds
29136	YaelDillies author:YaelDillies	feat(CategoryTheory/Monoidal): `mapMon` of a lax-braided functor is lax-braided	Also move the `BraidedCategory (Mon_ C)` instance earlier in the file to avoid splitting up the functor material. I think it makes more sense like this (defining `Mon_Class`, then `Mon_`, then `Functor.mapMon`). From Toric --- - [ ] depends on: #30157 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-category-theory merge-conflict	466/404	Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/CategoryTheory/Monoidal/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean	3	12	['YaelDillies', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	TwoFX assignee:TwoFX	0-38979 10 hours ago	0-38980 10 hours ago	29-76830 29 days
29925	jcreinhold author:jcreinhold	feat(CategoryTheory/MarkovCategory): Add Markov category	This PR introduces Markov categories, extending copy-discard categories with natural discard to model categorical probability theory. This PR builds on #29939 and #29919 and was split up from #29657. ## Main additions ### 1. Markov categories (`MarkovCategory`) Extends `CopyDiscardCategory` where discard is natural: `f ≫ ε[Y] = ε[X]` for all morphisms `f : X → Y`. This forces a probabilistic interpretation where morphisms preserve normalization (probability measures sum to 1). ### 2. Cartesian categories as Markov categories Proves that every cartesian monoidal category forms a Markov category where: - Copy is the diagonal morphism `x ↦ (x, x)` - Discard is the unique morphism to terminal - All morphisms are deterministic (preserve copying perfectly) This shows cartesian categories model deterministic computation within the probability framework. ## Mathematical significance Markov categories capture probability theory categorically: - Morphisms: Stochastic processes/Markov kernels - Copy: Perfect correlation (both outputs always equal) - Discard: Marginalization (integrating out variables) - Natural discard: Preservation of total probability The same framework handles finite probability (stochastic matrices), measure-theoretic probability (Markov kernels), and quantum probability (completely positive maps). ## Design decisions - Terminal unit follows from axioms. We prove `unit_terminal` and `unit_isTerminal` rather than assuming them - Cartesian instance automation: The braiding, symmetric, copy-discard, and Markov instances for cartesian categories work automatically via type class inference ## Implementation notes - Built on top of `CopyDiscardCategory` per suggestion [#mathlib4 > Markov categories PR @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Markov.20categories.20PR/near/539656225) - Includes both computational (`unit_terminal`) and categorical (`unit_isTerminal`) characterizations of the terminal object ## References Cho & Jacobs (2019) and Fritz (2020) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #29939	new-contributor t-category-theory merge-conflict	476/0	Mathlib.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Basic.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Cartesian.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Deterministic.lean,Mathlib/CategoryTheory/MarkovCategory/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/Cartesian.lean,MathlibTest/CategoryTheory/MarkovCategory.lean,docs/references.bib	8	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-26293 7 hours ago	0-26294 7 hours ago	0-0 0 seconds
13158	erdOne author:erdOne	refactor(RingTheory/OreLocalization/Module): remove `LocalizedModule.mk`.	--- - [x] depends on: #13151 - [ ] depends on: #13156 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	49/48	Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Module.lean	2	1	['leanprover-community-mathlib4-bot']	nobody	451-46960 1 year ago	451-46983 1 year ago	0-0 0 seconds
14889	yuma-mizuno author:yuma-mizuno	feat(CategoryTheory/Bicategory/Monad): define monad in bicategory	--- - [ ] depends on: #12107 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR WIP	1566/12	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Oplax.lean,Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Bicategory/Monad/Adjunction.lean,Mathlib/CategoryTheory/Bicategory/Monad/Basic.lean,Mathlib/CategoryTheory/Bicategory/Monad/Cat.lean,Mathlib/CategoryTheory/Monad/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Coherence.lean,Mathlib/Tactic/Widget/StringDiagram.lean,scripts/noshake.json,test/StringDiagram.lean,widget/src/penrose/monoidal.dsl,widget/src/penrose/monoidal.sty	14	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	429-66286 1 year ago	441-77524 1 year ago	0-0 0 seconds
12879	grunweg author:grunweg	feat: port ge_or_gt linter from mathlib3	Code works and is essentially green: next step is to split up into separate PRs. Feedback welcome on whether: - all the test changes are good, or I should simply allow it in more cases - if calc blocks need to be explicitly exempt --- - [ ] depends on: #12933 - [ ] depends on: #12934 - [ ] depends on: #12931 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-linter merge-conflict blocked-by-other-PR	736/319	Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q5.lean,Archive/Imo/Imo2019Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BirthdayProblem.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Star/CHSH.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Group/ControlledClosure.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Int/Lemmas.lean,Mathlib/Data/Nat/Dist.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/Parity.lean,Mathlib/Data/Nat/Upto.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/UInt.lean,Mathlib/GroupTheory/Coxeter/Length.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/Rayleigh.lean,Mathlib/Order/Filter/AtTopBot.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/RingTheory/Adjoin/Basic.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CancelDenoms/Core.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/IntervalCases.lean,Mathlib/Tactic/Linarith/Datatypes.lean,Mathlib/Tactic/Linarith/Lemmas.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linter/GeOrGt.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/NormNum/GCD.lean,Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean,Mathlib/Topology/MetricSpace/CauSeqFilter.lean,Mathlib/Topology/MetricSpace/Cauchy.lean,Mathlib/Topology/MetricSpace/Closeds.lean,Mathlib/Topology/Sequences.lean,scripts/lint-style.py,test/Explode.lean,test/GCongr/inequalities.lean,test/GeOrGt.lean,test/LibrarySearch/IsCompact.lean,test/LibrarySearch/basic.lean,test/Recall.lean,test/Rify.lean,test/Use.lean,test/cancel_denoms.lean,test/congr.lean,test/delabLinearIndependent.lean,test/delaborators.lean,test/interval_cases.lean,test/linarith.lean	109	3	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	429-66283 1 year ago	451-46983 1 year ago	0-15202 4 hours
13057	alreadydone author:alreadydone	feat(NumberTheory): characterize elliptic divisibility sequences	Main results: + Every `normEDS` is an elliptic divisibility sequence (EDS). The key proof is `rel₄_of_anti_oddRec_evenRec`, based on my original argument first published on [MathSE](https://math.stackexchange.com/a/4903422/12932) + Conversely, every EDS is equal to some `normEDS` (assuming that the first two terms are not zero divisors) --- - [ ] depends on: #13155 - [x] depends on: #13153 - [x] depends on: #10843 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory merge-conflict blocked-by-other-PR label:t-algebra$	1032/55	Mathlib/Algebra/Ring/NegOnePow.lean,Mathlib/Data/Int/Defs.lean,Mathlib/Data/Int/Parity.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	5	6	['Multramate', 'alreadydone', 'kbuzzard', 'leanprover-community-mathlib4-bot']	nobody	429-66283 1 year ago	480-21271 1 year ago	0-34665 9 hours
10842	mcdoll author:mcdoll	chore: simplify proofs using new positivity extensions and tests	--- - [x] depends on: #10661 - [ ] depends on: #10796 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR WIP	98/50	Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/SpecialFunctions/Gaussian.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Real.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Unique.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Measure/Tilted.lean,Mathlib/Probability/Martingale/Upcrossing.lean,Mathlib/Probability/Moments.lean,Mathlib/Probability/Variance.lean,Mathlib/Tactic/Positivity/Core.lean,test/positivity.lean	14	1	['leanprover-community-mathlib4-bot']	nobody	429-66281 1 year ago	493-69502 1 year ago	0-0 0 seconds
7564	shuxuezhuyi author:shuxuezhuyi	feat(Topology/Algebra/Order): extend strictly monotone function on `Ioo` to homeomorphism on `Icc`	A strictly monotone function between open intervals can be extended to a homeomorphism between the closed intervals. --- - [ ] depends on: #7351 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict blocked-by-other-PR	162/0	Mathlib.lean,Mathlib/Topology/Algebra/Order/IccExtendFromIoo.lean	2	1	['leanprover-community-mathlib4-bot']	nobody	429-66279 1 year ago	451-46983 1 year ago	0-0 0 seconds
8364	thorimur author:thorimur	feat: `refine?`	This PR adds `refine? e`, which suggests replacing unsynthesized `_`'s in `e` with `?_` in order to make `refine e'` work: ```lean example : Nat → Nat := by refine? fun (_ : _) => _ -- Try this: refine fun (_ : _) => ?_ ``` Note that this only suggests replacements for `_`'s present in the syntax; to create goals for implicit or instance arguments, the user is expected to use `refine'`. --- I'm especially open to suggestions on the filename (currently `RefineFix`). I'm also curious if this behaves as expected! Feel free to try it out "in real life" and comment here on edge cases. - [ ] depends on: #8503 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict blocked-by-other-PR	684/5	Mathlib.lean,Mathlib/Lean/CoreM.lean,Mathlib/Lean/Elab/Tactic/ElabTerm.lean,Mathlib/Lean/Elab/Term.lean,Mathlib/Tactic.lean,Mathlib/Tactic/RefineFix.lean,Mathlib/Util/Delaborators.lean,Mathlib/Util/Syntax.lean,test/RefineFix.lean	9	5	['j-loreaux', 'leanprover-community-mathlib4-bot', 'thorimur']	nobody	429-66279 1 year ago	451-46983 1 year ago	6-59794 6 days
7512	Komyyy author:Komyyy	perf: override the data structures of coinductive types	The data structures of the model of coinductive types (`Stream'`, `Computation`, `Stream'.Seq`) are inefficient, so we override their data structures. --- - [x] depends on: #7514 - [ ] depends on: leanprover/lean4#2292 - [x] depends on: leanprover/std4#371 - [x] depends on: #8460 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict blocked-by-core-PR blocked-by-other-PR WIP	6919/3700	Mathlib.lean,Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/Basic.lean,Mathlib/Algebra/ContinuedFractions/Computation/CorrectnessTerminating.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/ContinuedFractions/ContinuantRecurrence.lean,Mathlib/Algebra/ContinuedFractions/EvalEquiv.lean,Mathlib/Algebra/ContinuedFractions/Real.lean,Mathlib/Algebra/ContinuedFractions/TerminatedStable.lean,Mathlib/Algebra/ContinuedFractions/Translations.lean,Mathlib/Combinatorics/Hindman.lean,Mathlib/Control/Fix.lean,Mathlib/Control/LawfulFix.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Seq/Parallel.lean,Mathlib/Data/Seq/Seq.lean,Mathlib/Data/Seq/WSeq.lean,Mathlib/Data/Stream.lean,lean-toolchain	22	2	['digama0', 'leanprover-community-mathlib4-bot']	nobody	429-66279 1 year ago	491-43920 1 year ago	0-0 0 seconds
4785	thorimur author:thorimur	feat: ExprWithLevels	This introduces `ExprWithLevels`, a means of emulating universe polymorphism for non-constants during metaprogramming. [Description pending] - [ ] depends on: #4786 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict blocked-by-other-PR	491/1	Mathlib.lean,Mathlib/Lean/Meta/AppBuilder.lean,Mathlib/Lean/Meta/Basic.lean,Mathlib/Lean/Meta/ExprWithLevels.lean	4	1	['kim-em']	nobody	429-66278 1 year ago	493-69502 1 year ago	0-0 0 seconds
13852	FR-vdash-bot author:FR-vdash-bot	perf: skip some typeclasses in TC search	--- - [ ] depends on: #7873 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis merge-conflict blocked-by-other-PR	45/33	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/RingTheory/Norm.lean	3	21	['FR-vdash-bot', 'MichaelStollBayreuth', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	425-36267 1 year ago	425-36268 1 year ago	0-0 0 seconds
7565	shuxuezhuyi author:shuxuezhuyi	feat(Topology/Algebra/Order): extend homeomorphism of `Ioo` to `Icc`	We extend the homeomorphisms between open intervals to homeomorphisms between the closed intervals. --- - [ ] depends on: #7018 - [ ] depends on: #7351 - [ ] depends on: #7564 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-topology merge-conflict blocked-by-other-PR	389/5	Mathlib.lean,Mathlib/Data/Set/Intervals/Image.lean,Mathlib/Order/Directed.lean,Mathlib/Topology/Algebra/Order/IccExtendFromIoo.lean,Mathlib/Topology/Algebra/Order/IntermediateValue.lean	5	1	['leanprover-community-mathlib4-bot']	nobody	415-59932 1 year ago	415-59932 1 year ago	0-0 0 seconds
11520	thorimur author:thorimur	feat: `linting_rules` and deprecated syntax	--- Experimental. WIP. Might not be performance-viable. - [ ] depends on: #11519 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict blocked-by-other-PR	1016/0	Mathlib.lean,Mathlib/Command/Linter.lean,Mathlib/Command/Linter/Deprecated.lean,Mathlib/Command/Linter/LintingRules.lean,Mathlib/Command/SyntaxRules.lean,Mathlib/Command/SyntaxRules/Attr.lean,Mathlib/Command/SyntaxRules/Elab.lean,Mathlib/Command/SyntaxRules/Header.lean,Mathlib/Command/SyntaxRules/Util.lean,Mathlib/Tactic/Common.lean,scripts/noshake.json	11	11	['leanprover-bot', 'leanprover-community-mathlib4-bot', 'thorimur']	nobody	414-56137 1 year ago	414-56137 1 year ago	0-0 0 seconds
9154	FR-vdash-bot author:FR-vdash-bot	feat: `npow` / `nsmul` / `Nat.cast`/ `zpow` / `zsmul` implemented using `Nat.binaryRec`	--- - [ ] depends on: https://github.com/leanprover/lean4/pull/3756 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author blocked-by-other-PR label:t-algebra$	168/359	Mathlib/Algebra/Group/Defs.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/Primrec.lean,Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Digits.lean,Mathlib/Data/Nat/EvenOddRec.lean,Mathlib/Data/Nat/Fib/Basic.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Order/Basic.lean,Mathlib/Data/Nat/Parity.lean,Mathlib/Data/Nat/Size.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Init/Data/Nat/Bitwise.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Denumerable.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/Nat.lean,lake-manifest.json,lakefile.lean,test/zmod.lean	25	7	['FR-vdash-bot', 'eric-wieser', 'kim-em', 'leanprover-community-mathlib4-bot']	nobody	414-55610 1 year ago	414-55610 1 year ago	0-0 0 seconds
7026	mo271 author:mo271	feat: toMonoidHom_coe	- [ ] depends on: #6791 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory merge-conflict blocked-by-other-PR	16/0	Mathlib/NumberTheory/LegendreSymbol/MulCharacter.lean	1	3	['leanprover-community-mathlib4-bot', 'mo271']	nobody	414-55573 1 year ago	414-55573 1 year ago	0-0 0 seconds
7861	shuxuezhuyi author:shuxuezhuyi	feat(Geometry/Hyperbolic/UpperHalfPlane): instance IsometricSMul PSL(2, ℝ) ℍ	--- - [ ] depends on: #7835 - [ ] depends on: #7791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry merge-conflict blocked-by-other-PR	98/0	Mathlib.lean,Mathlib/Geometry/Hyperbolic/UpperHalfPlane/Basic.lean,Mathlib/LinearAlgebra/Matrix/ProjectiveSpecialLinearGroup.lean	3	1	['leanprover-community-mathlib4-bot']	nobody	389-65609 1 year ago	389-65609 1 year ago	0-0 0 seconds
12087	JADekker author:JADekker	feat : complete API for K-Lindelöf spaces	--- - [ ] depends on: #11800 (which is now awaiting a design decision) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict please-adopt blocked-by-other-PR	789/17	Mathlib.lean,Mathlib/Order/Filter/CardinalInter.lean,Mathlib/Topology/Compactness/KLindelof.lean,Mathlib/Topology/Compactness/Lindelof.lean	4	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	382-78193 1 year ago	382-78193 1 year ago	1-72084 1 day
13782	alreadydone author:alreadydone	feat(EllipticCurve): ZSMul formula in terms of division polynomials	The formula $[n]P = (\phi_n(x,y) : \omega_n(x,y) : \psi_n(x,y))$ in Jacobian coordinates for $P=(x,y)$ a nonsingular point on a Weierstrass/elliptic curve. --- - [x] depends on: #12883 - [x] depends on: #13399 - [ ] depends on: #13057 - [ ] depends on: #13155 - [x] depends on: #13845 - [x] depends on: #13846 - [ ] depends on: #13847 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-algebraic-geometry t-number-theory merge-conflict blocked-by-other-PR label:t-algebra$	2462/232	Mathlib.lean,Mathlib/Algebra/MvPolynomial/PDeriv.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/ZSMul.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Universal.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	10	n/a	['Multramate', 'alreadydone', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	377-9802 1 year ago	unknown	unknown
14242	js2357 author:js2357	feat: Prove equivalence of `isDedekindDomain` and `isDedekindDomainDvr`	Prove that `isDedekindDomainDvr` is equivalent to both `isDedekindDomain` and `isDedekindDomainInv`. Specifically, prove `isDedekindDomainDvr A → isDedekindDomainInv A`, because `isDedekindDomain A → isDedekindDomainDvr A` and `IsDedekindDomain A ↔ IsDedekindDomainInv A` are already in Mathlib. - [x] depends on: #14099 - [x] depends on: #14216 - [ ] depends on: #14237 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	269/1	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Dvr.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean	4	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	374-29474 1 year ago	374-29474 1 year ago	0-0 0 seconds
16215	adomasbaliuka author:adomasbaliuka	feat(Tactic/Linter): lint unwanted unicode	Add a text-based style linter that checks all unicode characters. - Only allow whitelisted characters, with a suggestion to add the flagged character to the whitelist - Some characters are specified to use emoji-variant or text-variant. The linter ensures these variant-selectors only appear in the correct places and provides an auto-fix to clean them up. --- Discussed at [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F/near/448721083) The current proposal checks each character against a whitelist. There is also the question of what the whitelist should contain. A reasonable whitelist might be "all unicode currently in Mathlib" ∪ [Wikipedia/Mathematical_operators_and_symbols_in_Unicode](https://en.wikipedia.org/wiki/Mathematical_operators_and_symbols_in_Unicode) ∪ [EdAyers/mathlib3/docs/unicode.md](https://github.com/EdAyers/mathlib/blob/fb5c2ffe917049959597b0a93b872e91f4004922/docs/unicode.md). Currently implemented is a subset of this list closer to what's currently present in mathlib. - [x] depends on: #17068 - [x] depends on: #17116 - [ ] depends on: #17129 (part 1 of this PR) - [ ] depends on: #17131 (part 2 of this PR) - Future note: @adomasbaliuka says: "we might add something to the Mathlib 4 docs about this as well?" [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict blocked-by-other-PR	462/15	Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnicodeLinter.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CongrM.lean,Mathlib/Tactic/Widget/Conv.lean,Mathlib/Tactic/Widget/GCongr.lean,Mathlib/Topology/ContinuousFunction/Weierstrass.lean,test/LintStyle.lean	9	51	['adomasbaliuka', 'eric-wieser', 'github-actions', 'grunweg', 'joneugster', 'mathlib4-dependent-issues-bot']	nobody	368-83883 1 year ago	368-83883 1 year ago	12-19694 12 days
16888	metinersin author:metinersin	feat(ModelTheory/Complexity): Define conjunctive and disjunctive normal forms	Define `FirstOrder.Language.BoundedFormula.IsDNF` and `FirstOrder.Language.BoundedFormula.IsCNF`. --- - [ ] depends on: #16887 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict blocked-by-other-PR	415/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	366-25452 1 year ago	366-25452 1 year ago	0-1045 17 minutes
16887	metinersin author:metinersin	feat(ModelTheory/Complexity): define conjunctive and disjunctive formulas	Defines `FirstOrder.Language.BoundedFormula.IsConjunctive` and `FirstOrder.Language.BoundedFormula.IsDisjunctive`. --- - [ ] depends on: #16885 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict blocked-by-other-PR	300/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	366-25452 1 year ago	366-25453 1 year ago	0-1299 21 minutes
16889	metinersin author:metinersin	feat(ModelTheory/Complexity): Normal forms	Defines `FirstOrder.Language.BoundedFormula.toDNF` and `FirstOrder.Language.BoundedFormula.toCNF` - given a quantifier-free formula, these construct a semantically equivalent formula in disjunctive normal form and conjunctive normal form, respectively. --- - [ ] depends on: #16888 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict blocked-by-other-PR	525/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	366-25451 1 year ago	366-25451 1 year ago	0-613 10 minutes
13965	pechersky author:pechersky	feat(Data/DigitExpansion): reals via digit expansion are complete	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #13964	t-data merge-conflict blocked-by-other-PR	3876/0	Mathlib.lean,Mathlib/Data/DigitExpansion/Add.lean,Mathlib/Data/DigitExpansion/Defs.lean,Mathlib/Data/DigitExpansion/Hensel.lean,Mathlib/Data/DigitExpansion/Integer/Basic.lean,Mathlib/Data/DigitExpansion/Integer/Mul.lean,Mathlib/Data/DigitExpansion/Real/Basic.lean,Mathlib/Data/DigitExpansion/Real/CompleteSpace.lean,Mathlib/Data/DigitExpansion/Real/ConditionallyComplete.lean,docs/references.bib	10	4	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	352-83593 11 months ago	352-83593 11 months ago	0-0 0 seconds
17519	grunweg author:grunweg	feat: the `metrisableSpace` linter	Similar to #10235, lint on occurrences of `MetricSpace` which should be `MetrisableSpace`. --- - [ ] depends on: #10235 (for all the details) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict blocked-by-other-PR	155/21	Mathlib.lean,Mathlib/Algebra/MvPolynomial/PDeriv.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/MLList/Split.lean,Mathlib/GroupTheory/Perm/DomMulAct.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean,Mathlib/MeasureTheory/Measure/Doubling.lean,Mathlib/NumberTheory/JacobiSum/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp/RefinedDiscrTree.lean,Mathlib/Tactic/Linter/UnusedAssumptionInType.lean,Mathlib/Util/Superscript.lean,scripts/noshake.json	19	4	['github-actions', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	352-20107 11 months ago	361-20581 11 months ago *	361-20545 361 days *
12750	Command-Master author:Command-Master	feat: define Gray code	--- Define binary reflected gray code, both as a permutation of `Nat` and as a permutation of `BitVec n`, and prove some theorems about them. Additionally, remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. - [ ] depends on: #12751 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict awaiting-author blocked-by-other-PR	226/0	Mathlib.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/GrayCode.lean,Mathlib/Data/Nat/Size.lean	5	5	['Rida-Hamadani', 'alreadydone', 'github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	348-48109 11 months ago	348-48109 11 months ago	6-8380 6 days
13514	madvorak author:madvorak	feat(Computability/ContextFreeGrammar): closure under union	- [ ] depends on: #15895 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability merge-conflict blocked-by-other-PR	448/4	Mathlib/Computability/ContextFreeGrammar.lean	1	50	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'leanprover-community-mathlib4-bot', 'madvorak']	nobody	335-59437 11 months ago	335-59437 11 months ago	72-28392 72 days
17518	grunweg author:grunweg	feat: lint on declarations mentioning `Invertible` or `Unique`	Using the same infrastructure as for #10235. Depends on that PR to land first, and also (for the first lint) a zulip discussion if that change is desired/about the best way to enact it. --- - [ ] depends on: #10235	awaiting-zulip t-linter merge-conflict blocked-by-other-PR	149/7	Mathlib.lean,Mathlib/Algebra/MvPolynomial/PDeriv.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/GroupTheory/Perm/DomMulAct.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/NumberTheory/JacobiSum/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/FundamentalTheorem.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/UnusedAssumptionInType.lean	13	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	335-32170 11 months ago	361-20692 11 months ago *	0-0 0 seconds *
16428	FR-vdash-bot author:FR-vdash-bot	test use `QuotLike` APIs	--- - [ ] depends on: #16421 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict blocked-by-other-PR	1501/564	Mathlib.lean,Mathlib/Algebra/Associated/Basic.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Order/CauSeq/Completion.lean,Mathlib/Algebra/Quandle.lean,Mathlib/CategoryTheory/IsomorphismClasses.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/Data/Finmap.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/Functor.lean,Mathlib/Data/QPF/Multivariate/Constructions/Fix.lean,Mathlib/Data/QPF/Univariate/Basic.lean,Mathlib/Data/Quot.lean,Mathlib/Data/QuotLike.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/Coset/Basic.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/GroupTheory/Subgroup/Center.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Relation.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Finite.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Lists.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/Topology/Inseparable.lean,test/QuotLike.lean	43	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	333-47249 10 months ago	333-47249 10 months ago	0-0 0 seconds
18716	jjaassoonn author:jjaassoonn	feat(Algebra/Module/GradedModule): quotient and subgrading	- [ ] depends on: #9820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict blocked-by-other-PR WIP label:t-algebra$	997/191	Counterexamples/HomogeneousPrimeNotPrime.lean,Mathlib.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Module/GradedModule/Basic.lean,Mathlib/Algebra/Module/GradedModule/QuotientGrading.lean,Mathlib/Algebra/Module/GradedModule/Subgrading.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean,Mathlib/RingTheory/GradedAlgebra/Quotient.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,scripts/no_lints_prime_decls.txt	12	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	329-32137 10 months ago	329-32137 10 months ago	0-0 0 seconds
18784	erdOne author:erdOne	feat(AlgebraicGeometry) use `addMorphismPropertyInstances`	--- - [ ] depends on: #18785 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict blocked-by-other-PR	435/91	Mathlib.lean,Mathlib/AlgebraicGeometry/Cover/Open.lean,Mathlib/AlgebraicGeometry/Morphisms/Affine.lean,Mathlib/AlgebraicGeometry/Morphisms/ClosedImmersion.lean,Mathlib/AlgebraicGeometry/Morphisms/FinitePresentation.lean,Mathlib/AlgebraicGeometry/Morphisms/FiniteType.lean,Mathlib/AlgebraicGeometry/Morphisms/OpenImmersion.lean,Mathlib/AlgebraicGeometry/Morphisms/Proper.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiCompact.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiSeparated.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicGeometry/Morphisms/Smooth.lean,Mathlib/AlgebraicGeometry/Morphisms/UniversallyClosed.lean,Mathlib/AlgebraicGeometry/Restrict.lean,Mathlib/CategoryTheory/MorphismProperty/Composition.lean,Mathlib/CategoryTheory/MorphismProperty/Limits.lean,Mathlib/CategoryTheory/MorphismProperty/Tactic.lean,MathlibTest/AddMorphismPropertyInstances.lean	18	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	328-57558 10 months ago	328-57558 10 months ago	0-1869 31 minutes
16014	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Principal): even more lemmas on additively principal ordinals	--- These are useful for my work on Cantor normal forms. - [ ] depends on: #15989 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-logic merge-conflict blocked-by-other-PR	99/60	Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/SetTheory/Ordinal/Principal.lean	2	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	325-55600 10 months ago	325-55600 10 months ago	0-664 11 minutes
17593	FR-vdash-bot author:FR-vdash-bot	chore(Algebra/Order/GroupWithZero/Unbundled): deprecate useless lemmas, use `ZeroLEOneClass`	There are still some useless lemmas that were simply ported from `Algebra.Order.Monoid.Lemmas`, such as just chain an existing lemma with an assumption and lemmas whose assumptions imply `1 ≤ 0`. This PR removes them. Also, some lemmas have both assumptions like `1 < a` `0 < a`. This PR uses `ZeroLEOneClass` to remove redundant assumptions. --- - [ ] depends on: #17623 Ported from https://github.com/leanprover-community/mathlib/pull/16525 and https://github.com/leanprover-community/mathlib/pull/18158 Adapted from #9250. This version is easier to review. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	188/48	Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Counting.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/Order/Field.lean	6	n/a	['FR-vdash-bot', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	317-51701 10 months ago	unknown	unknown
17624	FR-vdash-bot author:FR-vdash-bot	feat(Algebra/Order/GroupWithZero/Unbundled): generalize lemmas	--- - [ ] depends on: #17623 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	121/26	Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	314-2473 10 months ago	314-2473 10 months ago	0-465 7 minutes
17515	FR-vdash-bot author:FR-vdash-bot	perf: do not need `simp low` now	--- - [ ] depends on: #17513 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	12/10	Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Analysis/SpecialFunctions/Bernstein.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/NumberTheory/LucasLehmer.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	312-47894 10 months ago	312-47894 10 months ago	0-380 6 minutes
16210	FR-vdash-bot author:FR-vdash-bot	Clean up quotient APIs	~~We may migrate to `Quot` and `IsEquiv` APIs in the future, but it might be a good start to clean up `Quotient` APIs anyway.~~ The diffs in this PR did not include `QuotLike` APIs, but eventually I decided to migrate to `QuotLike` before deprecating some old APIs. This is because some lemmas don't have alternatives that don't use `· ≈ ·`, and the alternatives that use `· ≈ ·` are in the core. See [Zulip](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/.60.28.C2.B7.20.E2.89.88.20.C2.B7.29.60.20in.20.60Quotient.60.20APIs/near/466970386). --- - [x] depends on: #16254 - [x] depends on: #16256 - [x] depends on: #16258 - [x] depends on: #16260 - [x] depends on: #16264 - [x] depends on: #16267 - [ ] depends on: #16314 - [x] depends on: #16410 - [x] depends on: #17588 - [x] depends on: #17594 - [x] depends on: #17940 - [ ] depends on: #17941 --- `QuotLike` - [ ] depends on: #16421 - [ ] depends on: #16428 --- [remaining diffs](https://github.com/leanprover-community/mathlib4/compare/FR_quot_now..FR_quot) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data tech debt merge-conflict blocked-by-other-PR	1015/1114	Counterexamples/CliffordAlgebraNotInjective.lean,Mathlib/Algebra/Associated/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset.lean,Mathlib/Algebra/CharZero/Quotient.lean,Mathlib/Algebra/DirectLimit.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Lie/Free.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/Module/Zlattice/Basic.lean,Mathlib/Algebra/Order/CauSeq/Completion.lean,Mathlib/Algebra/Periodic.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/Analysis/Normed/Group/Quotient.lean,Mathlib/Analysis/Normed/Group/SemiNormedGrp/Kernels.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/CategoryTheory/ConnectedComponents.lean,Mathlib/CategoryTheory/Limits/Shapes/SingleObj.lean,Mathlib/CategoryTheory/Limits/Types.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Combinatorics/Quiver/ConnectedComponent.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Computability/Reduce.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Countable/Defs.lean,Mathlib/Data/FinEnum.lean,Mathlib/Data/Finite/Basic.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/FieldTheory/PerfectClosure.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/GroupTheory/Abelianization.lean,Mathlib/GroupTheory/Commensurable.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/GroupTheory/Complement.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/Coprod/Basic.lean,Mathlib/GroupTheory/Coset/Basic.lean,Mathlib/GroupTheory/DoubleCoset.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/SchurZassenhaus.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/GroupTheory/Transfer.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/LinearAlgebra/Dimension/Constructions.lean,Mathlib/LinearAlgebra/InvariantBasisNumber.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/Quotient.lean,Mathlib/LinearAlgebra/QuotientPi.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/MeasureTheory/Constructions/Polish/Basic.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Group/FundamentalDomain.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/Quotient.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/ModelTheory/Ultraproducts.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/RamificationInertia.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Category/PartOrd.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/Partition/Finpartition.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Hilbert90.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Functoriality.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Flat/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean	134	6	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	308-36358 10 months ago	396-25439 1 year ago	0-0 0 seconds
19414	vihdzp author:vihdzp	feat: Nesbitt's inequality	We prove [Nesbitt's inequality](https://en.wikipedia.org/wiki/Nesbitt%27s_inequality) `3 / 2 ≤ a / (b + c) + b / (c + a) + c / (b + a)` for a linearly ordered semifield, by reduction to the AM-HM inequality. --- - [ ] depends on: #19415 - [ ] depends on: #19420 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict awaiting-author blocked-by-other-PR WIP label:t-algebra$	192/142	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/Order/Antidiag/Pi.lean,Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Data/Fin/Tuple/NatAntidiagonal.lean,Mathlib/Data/Fin/Tuple/Reflection.lean,Mathlib/Data/Fintype/BigOperators.lean	10	8	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	305-84618 10 months ago	305-84618 10 months ago	0-481 8 minutes
18876	GabinKolly author:GabinKolly	feat(ModelTheory/Fraisse): add proof that Fraïssé limits exist	Fraïssé limits exist. --- All the preparatory work done in other files is contained in the pull request #18749, this pull request adds the work done in ModelTheory/Fraisse, the definition of the sequence of structures whose limit will be the Fraïssé limit, lemmas about this sequence, and then the proof that the limit is indeed a Fraïssé limit. - [ ] depends on: #18749 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic blocked-by-other-PR	666/5	Mathlib/ModelTheory/Bundled.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/FinitelyGenerated.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/ModelTheory/Substructures.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	300-49933 9 months ago	326-39903 10 months ago	0-37 37 seconds
19281	Vierkantor author:Vierkantor	chore(Algebra/{MonoidAlgebra,Polynomial}): algebra structure in `Basic.lean`	[As discussed in PR 19205](https://github.com/leanprover-community/mathlib4/pull/19205#discussion_r1848539148) the Algebra structure on `Polynomial` and `MonoidAlgebra` is very fundamental and shouldn't be hidden away. So let's refactor the import hierarchy to make them available in `Basic.lean`. In addition to #19097, this moves the algebra structure on polynomials into `Algebra/Polynomial/Basic.lean` (which will import the other important instances on polynomials), and moves the algebra structure on `MonoidAlgebra`s into `Algebra/MonoidAlgebra/Basic.lean` (moving most of the existing results in that file into `Lemmas.lean`). --- - [ ] depends on: #19097 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	3506/2792	Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/FreeNonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/MonoidAlgebra/Lemmas.lean,Mathlib/Algebra/MonoidAlgebra/Lift.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/MonoidAlgebra/Module.lean,Mathlib/Algebra/MonoidAlgebra/Opposite.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Cardinal.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Defs.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/TrailingDegree.lean,Mathlib/Algebra/Polynomial/EraseUpdate.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/Eval/Degree.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/Module.lean,Mathlib/Algebra/Polynomial/Monomial.lean,Mathlib/Algebra/Polynomial/Sum.lean,Mathlib/Algebra/Polynomial/Taylor.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Ext.lean,Mathlib/Data/Finsupp/Fintype.lean,Mathlib/Data/Finsupp/Indicator.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Finsupp/Pointwise.lean,Mathlib/Data/Finsupp/SMulWithZero.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/List/ToFinsupp.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Eigs.lean,Mathlib/RepresentationTheory/Maschke.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/MvPolynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Opposites.lean,Mathlib/RingTheory/Polynomial/Wronskian.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/Tactic/ExtractGoal.lean,MathlibTest/Polynomial.lean,MathlibTest/instance_diamonds.lean,scripts/noshake.json	52	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	297-50063 9 months ago	307-27193 10 months ago	0-0 0 seconds
19621	Command-Master author:Command-Master	feat: Multiplicity and prime-adic valuation of derivations	--- - [ ] depends on: #19596 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	397/13	Mathlib.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Order/WithBot.lean,Mathlib/RingTheory/Derivation/Multiplicity.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/PrimeMultiplicity.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	287-46761 9 months ago	287-46761 9 months ago	0-666 11 minutes
18262	joelriou author:joelriou	feat(Algebra/Category/ModuleCat/Presheaf): exterior powers of presheaves of modules	--- - [x] depends on: #18261 - [ ] depends on: #18236 - [ ] depends on: #18197 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-category-theory merge-conflict blocked-by-other-PR WIP label:t-algebra$	874/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/ExteriorPower.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/ExteriorPower.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/FunctorOfNatTrans.lean,Mathlib/Algebra/Category/ModuleCat/Pseudofunctor.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	287-38056 9 months ago	323-18121 10 months ago	0-0 0 seconds
11156	smorel394 author:smorel394	feat(LinearAlgebra/{TensorProductBasis,Dual}): basis and dual of `PiTensorProduct`	Construct a basis of a `PiTensorProduct` of modules given bases of the modules, and relationship between the dual of a `PiTensorProduct` and the `PiTensorProduct` of the duals. Main results: * `Basis.piTensorProduct` (in `LinearAlgebra/TensorProductBasis.lean`): Let `ι` be a `Fintype` and `M` be a family of modules indexed by `ι`. If `b i : κ i → M i` is a basis for every `i` in `ι`, then `fun (p : Π i, κ i) ↦ ⨂ₜ[R] i, b i (p i)` is a basis of `⨂[R] i, M i`. * `PiTensorProduct.dualDistrib` (in `LinearAlgebra/Dual.lean`): The canonical linear map from `⨂[R] i, Dual R (M i)` to `Dual R (⨂[R] i, M i)`, sending `⨂ₜ[R] i, f i` to the composition of `PiTensorProduct.map f` with the linear equivalence `⨂[R] i, R →ₗ R` given by multiplication. * `PiTensorProduct.dualDistribEquiv` (also in `LinearAlgebra/Dual.lean`): A linear equivalence between `⨂[R] i, Dual R (M i)` and `Dual R (⨂[R] i, M i)` when all `M i` are finite free modules. If `f : (i : ι) → Dual R (M i)`, then this equivalence sends `⨂ₜ[R] i, f i` to the composition of `PiTensorProduct.map f` with the natural isomorphism `⨂[R] i, R ≃ R` given by multiplication. - [ ] depends on: #11155 (currently used as the base branch; do not merge without switching it back to `master`!) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra merge-conflict please-adopt blocked-by-other-PR label:t-algebra$	166/2	Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/LinearAlgebra/TensorProduct/Basis.lean	3	4	['eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	277-46186 9 months ago	322-61814 10 months ago	0-0 0 seconds
15269	kkytola author:kkytola	feat: Add ENNReal.floor	A right-continuous floor function on `ENNReal`. --- - [x] depends on: #13938 - [ ] depends on: #15773 (general type class for `ENat`-valued floor functions) - [x] depends on: #15380 (topology on `ENat` is needed to state right continuity of the floor function) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra merge-conflict awaiting-author blocked-by-other-PR label:t-algebra$	445/0	Mathlib.lean,Mathlib/Algebra/Order/EFloor.lean,Mathlib/Data/ENNReal/Floor.lean,Mathlib/Data/Nat/Lattice.lean	4	18	['YaelDillies', 'github-actions', 'kkytola', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	274-18990 9 months ago	274-18990 9 months ago	0-3440 57 minutes
17471	joelriou author:joelriou	feat(Algebra/ModuleCat/Differentials/Sheaf): the sheaf of relative differentials	--- - [ ] depends on: #17366 - [x] depends on: #17388 - [x] depends on: #16755 - [ ] depends on: #17469 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebraic-geometry t-category-theory merge-conflict blocked-by-other-PR WIP	740/10	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Differentials/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Differentials/Sheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pullback.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/AlgebraicGeometry/Modules/Differentials.lean,Mathlib/Geometry/RingedSpace/SheafedSpace.lean	9	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	265-33407 8 months ago	unknown	unknown
19462	joelriou author:joelriou	feat(AlgebraicGeometry): étale sheafification	After #19096 and #18945 are merged, if `S : Scheme.{u}`, we shall get instances like `HasSheafify (smallEtaleTopology S) (Type (u + 1))` which means that in order to sheafify preshaves over the small étale site of `S`, we need to assume a certain bump in the universe in the target category. With the main result in this PR (there are still a few sorries), we shall get `HasSheafify (smallEtaleTopology S) (Type u)`. Then, in the subsequent development of étale formalism, we can work in `Type u` (or `Ab.{u}`, etc). --- This is a draft. - [ ] depends on: #19444 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict blocked-by-other-PR WIP	1336/2	Mathlib.lean,Mathlib/AlgebraicGeometry/Sites/EtaleSheafification.lean,Mathlib/CategoryTheory/Sites/Continuous.lean,Mathlib/CategoryTheory/Sites/DenseSubsite.lean,Mathlib/CategoryTheory/Sites/LocallyFullyFaithful.lean,Mathlib/CategoryTheory/Sites/OneHypercover.lean,Mathlib/CategoryTheory/Sites/OneHypercoverDense.lean,Mathlib/CategoryTheory/Sites/Sieves.lean	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	263-45865 8 months ago	310-54002 10 months ago	0-200 3 minutes
15720	znssong author:znssong	feat(SimpleGraph): The Bondy-Chvátal theorem	The proof of the Bondy-Chvátal theorem, with Dirac's theorem and Ore's theorem as its corollary. - [x] depends on: #15536 - [ ] depends on: #15711 - [ ] depends on: #15578	new-contributor t-combinatorics merge-conflict blocked-by-other-PR	903/3	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/BondyChvatal.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Increasing.lean	8	3	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	YaelDillies assignee:YaelDillies	260-48453 8 months ago	260-48453 8 months ago	0-1791 29 minutes
14412	jjaassoonn author:jjaassoonn	feat: show stalk of presheaf of modules is a module over stalk of ring	--- - [x] depends on: #14413 - [ ] depends on: #14501 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	workshop-AIM-AG-2024 t-algebraic-geometry merge-conflict blocked-by-other-PR	966/2	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/OverColimitsRing'.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/OverColimitsRing.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Limits/ConcreteCategory.lean,Mathlib/Geometry/RingedSpace/Basic.lean,Mathlib/Geometry/RingedSpace/Module.lean,Mathlib/Topology/Sheaves/Stalks.lean	8	5	['github-actions', 'jjaassoonn', 'leanprover-community-mathlib4-bot', 'smorel394']	nobody	258-32955 8 months ago	414-56575 1 year ago	0-0 0 seconds
12670	trivial1711 author:trivial1711	feat: completion of a nonarchimedean multiplicative group	We prove that the completion of a nonarchimedean multiplicative group is a nonarchimedean multiplicative group. --- - [x] depends on: #12669 - [ ] depends on: #11837 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict blocked-by-other-PR label:t-algebra$	358/228	Mathlib/Analysis/InnerProductSpace/Completion.lean,Mathlib/Analysis/Normed/Group/HomCompletion.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/GroupCompletion.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Algebra/UniformField.lean,Mathlib/Topology/Algebra/UniformMulAction.lean,Mathlib/Topology/Algebra/UniformRing.lean	9	n/a	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	246-21354 8 months ago	unknown	unknown
21277	GabinKolly author:GabinKolly	feat(ModelTheory/PartialEquiv): Define the mapping of a self-partialEquiv through an embedding	Define the mapping of a self-partialEquiv through an embedding and the notion of fully extendable partialEquiv. --- This is some preparatory work for #18876 - [ ] depends on: #21276 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic blocked-by-other-PR	215/5	Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/ModelTheory/Substructures.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	246-18401 8 months ago	246-18403 8 months ago	0-668 11 minutes
20248	peabrainiac author:peabrainiac	feat(Topology/Compactness): first-countable locally path-connected spaces are delta-generated	Shows that all first-countable locally path-connected spaces are delta-generated (so in particular all normed spaces and convex subsets thereof are), and that delta-generated spaces are equivalently generated by the unit interval or standard simplices. --- - [ ] depends on: #21616 In principle, this should be close to all that's required to show that all simplicial complexes and CW-complexes are delta-generated; I just haven't done it yet because I'm not sure which file to best do it in. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-topology merge-conflict awaiting-author blocked-by-other-PR	1189/813	Mathlib.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/Compactness/DeltaGeneratedSpace.lean,Mathlib/Topology/Connected/LocPathConnected.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/Homotopy/HSpaces.lean,Mathlib/Topology/Path.lean	9	22	['YaelDillies', 'github-actions', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'peabrainiac']	nobody	236-10689 7 months ago	236-10689 7 months ago	39-21495 39 days
20956	tomaz1502 author:tomaz1502	feat(Computability/QueryComplexity/Sort.lean): Formalization of upper bound of queries for merge sort	This PR builds on top of #20924 to prove that merge sort (as defined in Lean's library) never executes more than `3 * n * ceil_log2 n` comparisons, where `n` is the size of the input list and `ceil_log2` is the ceil of the logarithm in base 2, which is defined in this PR. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2318629.20runtime.20complexity.20of.20sorting.20a.20list - [ ] depends on: #20924 Co-authored-by: Geoffrey Irving --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability blocked-by-other-PR	676/0	Mathlib.lean,Mathlib/Computability/QueryComplexity/Basic.lean,Mathlib/Computability/QueryComplexity/Defs.lean,Mathlib/Computability/QueryComplexity/Sort.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	225-23477 7 months ago	254-36990 8 months ago	0-41 41 seconds
22233	pechersky author:pechersky	feat(Algebra/Valued): `AdicExpansion.evalAt`	--- - [ ] depends on: #22231 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	488/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	221-84575 7 months ago	221-84577 7 months ago	0-412 6 minutes
22232	pechersky author:pechersky	feat(Algebra/Valued): `AdicExpansion.apprUpto`	--- - [ ] depends on: #22231 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	399/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	221-84573 7 months ago	221-84576 7 months ago	0-414 6 minutes
19372	Command-Master author:Command-Master	find defeq abuse using diagnostics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #19177	large-import merge-conflict blocked-by-other-PR	169/1	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/FindDefEqAbuse.lean,MathlibTest/FindDefEqAbuse.lean,lakefile.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	214-54007 7 months ago	214-54007 7 months ago	0-0 0 seconds
14060	YnirPaz author:YnirPaz	feat(SetTheory/Ordinal/Clubs): define club sets and prove basic properties	Create a file where club sets are defined and their basic properties are proven. I also created a new recursion principle for ordinals, bounded recursion. --- - [ ] depends on: #19189 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict blocked-by-other-PR	315/3	Mathlib.lean,Mathlib/Order/SuccPred/Limit.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Club.lean,Mathlib/SetTheory/Ordinal/Topology.lean	6	93	['YaelDillies', 'YnirPaz', 'alreadydone', 'dupuisf', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp', 'zeramorphic']	nobody	213-82210 6 months ago	213-82210 6 months ago	92-44198 92 days
17105	vihdzp author:vihdzp	feat(Data/List/RunLength): run-length encoding	We define the run-length encoding of a list. We provide a basic API, as well as a recursion principle. --- - [ ] depends on: #16837 - [x] depends on: #17106 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict blocked-by-other-PR	286/1	Mathlib/Data/List/Flatten.lean,Mathlib/Data/List/RunLength.lean,Mathlib/Data/List/SplitBy.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	213-81963 6 months ago	213-81963 6 months ago	0-0 0 seconds
16000	YaelDillies author:YaelDillies	feat: Croot-Sisask Almost Periodicity	Almost periodicity is nowadays a standard tool in additive combinatorics. From LeanAPAP --- - [ ] depends on: #15443 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis t-combinatorics blocked-by-other-PR	0/0		0	4	['github-actions', 'leanprover-community-mathlib4-bot', 'mergify']	nobody	212-55797 6 months ago	212-55802 6 months ago	0-159 2 minutes
22340	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Beck-Chevalley Conditions)	Building on top of the API of `ExponentiableMorphism` in #22321, we state and prove Beck-Chevalley conditions. This will be crucial for our development of polynomial functors along exponentiable morphisms. Co-authored-by: Emily Riehl --- - [ ] depends on: #22321 - [ ] depends on: #22319 - [ ] depends on: #21525 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict blocked-by-other-PR WIP	1144/24	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Comma/Over/Sections.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Basic.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/BeckChevalley.lean,docs/references.bib	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	212-43058 6 months ago	212-43058 6 months ago	0-17 17 seconds
21275	joneugster author:joneugster	feat(Cache): decompress downloaded files directly	Extract downloaded files directly. This increases parallelism as files are downloaded in parallel and downloading/decompressing use different hardware (network/cpu) --- - [ ] depends on: #21238 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI t-meta merge-conflict blocked-by-other-PR WIP	66/15	Cache/IO.lean,Cache/Lean.lean,Cache/Requests.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	210-57654 6 months ago	210-57654 6 months ago	0-0 0 seconds
20410	vihdzp author:vihdzp	refactor: redefine `Equiv.Set.sumCompl = Equiv.sumCompl`	It's still useful to have `Equiv.Set.sumCompl` around, as `simp` can't otherwise see through the def-eq `{x // x ∈ s} ⊕ {x // ¬ x ∈ s} = s ⊕ sᶜ`. --- - [ ] depends on: #20850 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-CI merge-conflict blocked-by-other-PR WIP	33/21	Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/Fintype.lean,Mathlib/Logic/Equiv/Set.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	197-77135 6 months ago	197-77135 6 months ago	0-0 0 seconds
23145	joneugster author:joneugster	feat(CategoryTheory/Enriched/Limits): add IsConicalLimits	--- - [ ] depends on: #23142 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos t-category-theory merge-conflict blocked-by-other-PR	221/9	Mathlib.lean,Mathlib/CategoryTheory/Enriched/Limits/HasConicalLimits.lean,Mathlib/CategoryTheory/Enriched/Limits/IsConicalLimit.lean	3	3	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	196-30113 6 months ago	196-30113 6 months ago	0-806 13 minutes
20222	eric-wieser author:eric-wieser	feat: generalize lemmas about derivatives	Rather than creating a huge diff by shuffling things around, this generalizes everything in-place and swaps between `section`s for topological and normed vector spaces. The rationale for this approach is that: * we may further generalize the results of this file, and this avoids us jumbling up the order multiple times unnecessarily. * this greatly reduces the chance of merge conflicts --- - [ ] depends on: #21065 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict blocked-by-other-PR	554/50	Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,MathlibTest/Recall.lean	3	8	['adomani', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	186-62558 6 months ago	186-62558 6 months ago	16-16341 16 days
22321	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Definition)	This PR defines locally cartesian closed categories in terms of existence of the pushforward functors (right adjoint to the pullback functor) for all morphisms. We develop basic API and prove the following: 1. Existence of the pushforward functors is equivalent to cartesian closed slices. 2. Any locally cartesian closed category with a terminal object is cartesian closed. 3. The slices of a locally cartesian closed category are locally cartesian closed. Some of the content is based on the project of formalization of polynomial functors at the Trimester "Prospect of Formal Mathematics" at the Hausdorff Institute (HIM) in Bonn. https://github.com/sinhp/Poly I found this implementation of locally cartesian closed categories amenable to polynomial functors formalization. Co-authored-by: Emily Riehl --- - [ ] depends on: #21525 - [ ] depends on: #22319 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict blocked-by-other-PR	812/24	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Comma/Over/Sections.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Basic.lean	6	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	177-47273 5 months ago	177-47274 5 months ago	0-336 5 minutes
22319	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Sections Right Adjoint)	we define the `Over.sections` functor in the file `CategoryTheory.Comma.Over.Sections` and prove that it is a right adjoint to the `Over.star`, thereby solving an existing TODO in `Over.pullback` file. The `sections` functor is used to define the right adjoint to the pullback functor `Over.pullback` in the development of LCCCs. Moreover, the rest of added lemmas and theorems to `CategoryTheory.Comma.Over.Pullback` are crucial for the development of LCCCs in the next PR. --- - [ ] depends on: #21525 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict blocked-by-other-PR	547/24	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Comma/Over/Sections.lean,Mathlib/CategoryTheory/Galois/Examples.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	177-47273 5 months ago	177-47275 5 months ago	0-2084 34 minutes
19475	YaelDillies author:YaelDillies	feat: group markings	From LeanCamCombi --- - [ ] depends on: #21342 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR WIP label:t-algebra$	196/12	Mathlib.lean,Mathlib/Geometry/Group/Marking.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Quotient.lean	4	12	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	175-68804 5 months ago	175-68823 5 months ago	22-16818 22 days
24010	grunweg author:grunweg	feat(Counterexamples): a non-negative function, not a.e. zero, with vanishing lowe…	…r Lebesgue integral. Came up in #23707, let's document this while we're at it. --- - [ ] depends on: #20722 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability please-adopt blocked-by-other-PR WIP	110/0	Counterexamples.lean,Counterexamples/LIntegralZero.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	173-22619 5 months ago	173-22621 5 months ago	0-22 22 seconds
24040	FR-vdash-bot author:FR-vdash-bot	refactor: unbundle algebra from `(NonUnital){Seminormed, Normed}(Comm)Ring`	--- - [ ] depends on: #23966 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra t-analysis merge-conflict blocked-by-other-PR label:t-algebra$	3775/3674	Archive/Imo/Imo1998Q2.lean,Counterexamples/LinearOrderWithPosMulPosEqZero.lean,Mathlib/Algebra/Algebra/RestrictScalars.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/CPolynomialDef.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Analytic/Linear.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Analytic/Polynomial.lean,Mathlib/Analysis/Analytic/RadiusLiminf.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Analytic/Within.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/BoxIntegral/Integrability.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Measure.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Isometric.lean,Mathlib/Analysis/CStarAlgebra/ContinuousLinearMap.lean,Mathlib/Analysis/CStarAlgebra/ContinuousMap.lean,Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/GelfandDuality.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Defs.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/CStarAlgebra/Unitization.lean,Mathlib/Analysis/CStarAlgebra/lpSpace.lean,Mathlib/Analysis/Calculus/AddTorsor/AffineMap.lean,Mathlib/Analysis/Calculus/AddTorsor/Coord.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/BumpFunction/Convolution.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/BumpFunction/InnerProduct.lean,Mathlib/Analysis/Calculus/BumpFunction/Normed.lean,Mathlib/Analysis/Calculus/Conformal/InnerProduct.lean,Mathlib/Analysis/Calculus/Conformal/NormedSpace.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/CPolynomial.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/ContDiff/FiniteDimension.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Analysis/Calculus/ContDiff/WithLp.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/Abs.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/AffineMap.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Comp.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Calculus/Deriv/Linear.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/Deriv/Prod.lean,Mathlib/Analysis/Calculus/Deriv/Shift.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/Deriv/Star.lean,Mathlib/Analysis/Calculus/Deriv/Support.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/DiffContOnCl.lean,Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Bilinear.lean	630	n/a	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	172-41233 5 months ago	unknown	unknown
24058	FR-vdash-bot author:FR-vdash-bot	refactor: unbundle algebra from `*NormedField`	--- - [ ] depends on: #24040 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra t-analysis merge-conflict blocked-by-other-PR label:t-algebra$	4602/4346	Archive/Hairer.lean,Archive/Imo/Imo1998Q2.lean,Counterexamples/LinearOrderWithPosMulPosEqZero.lean,Mathlib/Algebra/Algebra/RestrictScalars.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/CPolynomialDef.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Analytic/Linear.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Analytic/Polynomial.lean,Mathlib/Analysis/Analytic/RadiusLiminf.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Analytic/Within.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/BoxIntegral/Integrability.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Measure.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Isometric.lean,Mathlib/Analysis/CStarAlgebra/ContinuousLinearMap.lean,Mathlib/Analysis/CStarAlgebra/ContinuousMap.lean,Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/GelfandDuality.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Defs.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/CStarAlgebra/Unitization.lean,Mathlib/Analysis/CStarAlgebra/lpSpace.lean,Mathlib/Analysis/Calculus/AddTorsor/AffineMap.lean,Mathlib/Analysis/Calculus/AddTorsor/Coord.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/BumpFunction/Convolution.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/BumpFunction/InnerProduct.lean,Mathlib/Analysis/Calculus/BumpFunction/Normed.lean,Mathlib/Analysis/Calculus/Conformal/InnerProduct.lean,Mathlib/Analysis/Calculus/Conformal/NormedSpace.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/CPolynomial.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/ContDiff/FiniteDimension.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Analysis/Calculus/ContDiff/WithLp.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/Abs.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/AffineMap.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Comp.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Calculus/Deriv/Linear.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/Deriv/Pi.lean,Mathlib/Analysis/Calculus/Deriv/Polynomial.lean,Mathlib/Analysis/Calculus/Deriv/Pow.lean,Mathlib/Analysis/Calculus/Deriv/Prod.lean,Mathlib/Analysis/Calculus/Deriv/Shift.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/Deriv/Star.lean,Mathlib/Analysis/Calculus/Deriv/Support.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean	665	7	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	171-36024 5 months ago	172-11843 5 months ago *	0-0 0 seconds *
24106	FR-vdash-bot author:FR-vdash-bot	refactor: unbundle algebra from `*CStarAlgebra`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #24058	slow-typeclass-synthesis t-algebra t-analysis merge-conflict blocked-by-other-PR label:t-algebra$	4702/4459	Archive/Hairer.lean,Archive/Imo/Imo1998Q2.lean,Counterexamples/LinearOrderWithPosMulPosEqZero.lean,Mathlib/Algebra/Algebra/RestrictScalars.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/CPolynomialDef.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Analytic/Linear.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Analytic/Polynomial.lean,Mathlib/Analysis/Analytic/RadiusLiminf.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Analytic/Within.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/BoxIntegral/Integrability.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Measure.lean,Mathlib/Analysis/CStarAlgebra/ApproximateUnit.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Isometric.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/CStarAlgebra/ContinuousLinearMap.lean,Mathlib/Analysis/CStarAlgebra/ContinuousMap.lean,Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/GelfandDuality.lean,Mathlib/Analysis/CStarAlgebra/Hom.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Defs.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/CStarAlgebra/PositiveLinearMap.lean,Mathlib/Analysis/CStarAlgebra/SpecialFunctions/PosPart.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/CStarAlgebra/Unitization.lean,Mathlib/Analysis/CStarAlgebra/lpSpace.lean,Mathlib/Analysis/Calculus/AddTorsor/AffineMap.lean,Mathlib/Analysis/Calculus/AddTorsor/Coord.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/BumpFunction/Convolution.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/BumpFunction/InnerProduct.lean,Mathlib/Analysis/Calculus/BumpFunction/Normed.lean,Mathlib/Analysis/Calculus/Conformal/InnerProduct.lean,Mathlib/Analysis/Calculus/Conformal/NormedSpace.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/CPolynomial.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/ContDiff/FiniteDimension.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Analysis/Calculus/ContDiff/WithLp.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/Abs.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/AffineMap.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Comp.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Calculus/Deriv/Linear.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/Deriv/Pi.lean,Mathlib/Analysis/Calculus/Deriv/Polynomial.lean,Mathlib/Analysis/Calculus/Deriv/Pow.lean,Mathlib/Analysis/Calculus/Deriv/Prod.lean	670	5	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	170-75565 5 months ago	170-77872 5 months ago *	0-0 0 seconds *
24016	plp127 author:plp127	feat: fine uniformity	Adds the fine uniformity, and proves some properties. --- - [ ] depends on: #24096 for showing the induced topology is equal on completely regular spaces [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	283/0	Mathlib.lean,Mathlib/Topology/UniformSpace/FineUniformity.lean,Mathlib/Topology/UniformSpace/Uniformizable.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	170-8850 5 months ago	170-8852 5 months ago	2-85349 2 days
21238	joneugster author:joneugster	feat(Cache): enable partial cache in downstream projects	Add features to `cache` and cleanup code: * enable partial cache retrieval in downstream projects: `lake exe cache get MyProject.Basic` downloads only the relevant cache to build `MyProject/Basic.lean` * accept paths `Mathlib/Init.lean` and modules `Mathlib.Init` likewise #21822 * accept folders in the form `Mathlib/Data` or `Mathlib.Data` and does a directory walk to find all`.lean` files therein #21838 * throw error if sources contain a build loop. #21632 * cleanup * internally cache now works with the module names as keys (used paths before) #21834 * eliminate need of parsing the `lake_manifest.json`, use the Lean search path from `LEAN_SRC_PATH` instead. #21666 * eliminate most hard-coded file paths, generating them from the module name with `Lean.findLean` #21818 * add documentation --- - [x] depends on: #21834 - [ ] depends on: #21838 ### Follow-up PR: - #21842 ### Notes: - replaces: #21195 - should address: #8767 - should address: #20568 ### Completed: - [x] depends on: #21632 - [x] ~~depends on: #21663~~ - [x] depends on: #21666 - [x] depends on: #21701 - [x] depends on: #21703 - [x] depends on: #21704 - [x] depends on: #21705 - [x] depends on: #21707 - [x] depends on: #21711 - [x] depends on: #21750 - [x] depends on: #21815 - [x] depends on: #21816 - [x] depends on: #21817 - [x] depends on: #21818 - [x] depends on: #21822 - [x] depends on: #21830 - #21848 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI t-meta merge-conflict blocked-by-other-PR	231/118	Cache/Hashing.lean,Cache/IO.lean,Cache/Main.lean	3	n/a	['github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	169-27678 5 months ago	unknown	unknown
21842	joneugster author:joneugster	refactor(Cache): use module name for file hash instead of non-resolved file path	This invalidates cache once, similarly to when the `lean-toolchain` gets bumped or the `lakefile` modified. --- - [ ] depends on: #21238 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI t-meta merge-conflict blocked-by-other-PR	284/139	Cache/Hashing.lean,Cache/IO.lean,Cache/Lean.lean,Cache/Main.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	169-27554 5 months ago	232-24577 7 months ago *	0-0 0 seconds *
19467	quangvdao author:quangvdao	feat(MvPolynomial/Equiv): Add `MvPolynomial.finSuccEquivNth`	This PR adds `MvPolynomial.finSuccEquivNth`, which is the algebra isomorphism between `MvPolynomial (Fin (n + 1)) R` and `Polynomial (MvPolynomial (Fin n) R)` by identifying the `p`-th variable as the indeterminate. This generalizes `MvPolynomial.finSuccEquiv` which is only for the `0`-th variable. The supporting theorems for the `Nth` version are identical to the current version, with the `Nth` version deduced from the former. These changes require new definitions in `Finsupp/Fin`, which is a separate PR. Co-authored-by: Yaël Dillies --- - [ ] depends on: #19315 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	541/163	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Finsupp/Fin.lean,scripts/nolints_prime_decls.txt	7	9	['acmepjz', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'quangvdao']	nobody	169-21775 5 months ago	169-21775 5 months ago	0-790 13 minutes
22547	joelriou author:joelriou	feat(CategoryTheory/Abelian): construction of reduced left resolutions	The standard functorial free resolution of a `R`-module `M` does not directly extend to free resolutions of (bounded above) complexes because the free `R`-module functor does preserve zero morphisms. In this PR, we provide a general construction which takes functorial left resolutions and modify them by considering a suitable direct factor so that it preserves zero morphisms. --- - [ ] depends on: #22539 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	514/19	Mathlib.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/LeftResolutions/Basic.lean,Mathlib/Algebra/Homology/LeftResolutions/Reduced.lean,Mathlib/Algebra/Homology/LeftResolutions/Transport.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	159-26086 5 months ago	213-48401 6 months ago	0-358 5 minutes
22556	joelriou author:joelriou	feat(Algebra/Category/ModuleCat): a functorial projective resolution	--- - [ ] depends on: #22539 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	315/19	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/LeftResolutions.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/LeftResolutions/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	159-25956 5 months ago	213-42714 6 months ago	0-516 8 minutes
24549	grunweg author:grunweg	feat: define embedded submanifolds, attempt 1	Not meant to be merged (I think a different design is better); opening this so I can find this more easily. --- - [ ] depends on: #23040 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	1445/2	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean,Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/EmbeddedSubmanifold.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MSplits.lean,Mathlib/LinearAlgebra/Prod.lean	8	2	['leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	153-69043 5 months ago	153-69043 5 months ago	0-1 1 second
11003	thorimur author:thorimur	chore: migrate to `tfae` block tactic	Migrates to the `tfae` block tactic syntax, eliminating uses of `tfae_have` and `tfae_finish`. --- - [ ] depends on: #11000 - [ ] depends on: #10991 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict blocked-by-other-PR WIP	1267/1081	Mathlib/Algebra/Exact.lean,Mathlib/Algebra/Homology/ShortComplex/ExactFunctor.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/CategoryTheory/Abelian/Exact.lean,Mathlib/CategoryTheory/Bicategory/Kan/Adjunction.lean,Mathlib/FieldTheory/Galois.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/LinearAlgebra/Eigenspace/Zero.lean,Mathlib/MeasureTheory/Group/Action.lean,Mathlib/NumberTheory/FLT/Basic.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/Height.lean,Mathlib/Order/WellFoundedSet.lean,Mathlib/RingTheory/Bezout.lean,Mathlib/RingTheory/DiscreteValuationRing/TFAE.lean,Mathlib/RingTheory/Flat/EquationalCriterion.lean,Mathlib/RingTheory/Henselian.lean,Mathlib/RingTheory/LocalRing/RingHom/Basic.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/ValuationRing.lean,Mathlib/SetTheory/Ordinal/Topology.lean,Mathlib/Tactic/TFAE.lean,Mathlib/Topology/Algebra/Group/SubmonoidClosure.lean,Mathlib/Topology/Category/CompHaus/EffectiveEpi.lean,Mathlib/Topology/Category/Profinite/EffectiveEpi.lean,Mathlib/Topology/Category/Stonean/EffectiveEpi.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/LocallyClosed.lean,Mathlib/Topology/LocallyConstant/Basic.lean,Mathlib/Topology/NoetherianSpace.lean,Mathlib/Topology/Order/LeftRightNhds.lean,Mathlib/Topology/Separation.lean,Mathlib/Topology/UniformSpace/UniformConvergence.lean,scripts/noshake.json,test/tfae.lean	42	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	153-67859 5 months ago	153-67859 5 months ago	0-0 0 seconds
16186	joneugster author:joneugster	chore: use emoji-variant-selector `\uFE0F` for emojis ✅️,❌️,💥️,🟡️	Append the emoji-variant selector `\uFE0F` to these 4 unicode symbols which should always be rendered as emojis. --- This has been done in core, so it makes sense to do the same in Mathlib. - [x] depends on: leanprover/lean4#5173 - [ ] depends on: #16215 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict awaiting-author blocked-by-other-PR	28/28	.github/workflows/lean4checker.yml,.github/workflows/nightly_detect_failure.yml,.github/workflows/update_dependencies_zulip.yml,scripts/lean-pr-testing-comments.sh,test/AssertExists.lean	5	3	['github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	153-67543 5 months ago	153-67543 5 months ago	7-61243 7 days
21853	smmercuri author:smmercuri	feat: the adele ring of a number field is locally compact	--- - [ ] depends on: #21158 - [ ] depends on: #21847 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-number-theory merge-conflict blocked-by-other-PR WIP	398/3	Mathlib.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	151-33280 4 months ago	153-68681 5 months ago	0-0 0 seconds
15654	TpmKranz author:TpmKranz	feat(Computability): language-preserving maps between NFA and RE	Map REs to NFAs via Thompson's construction and NFAs to REs using GNFAs Last chunk of #12648 --- - [ ] depends on: #15651 - [ ] depends on: #15649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-computability new-contributor merge-conflict blocked-by-other-PR	985/2	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Data/FinEnum/Option.lean,docs/references.bib	7	3	['github-actions', 'leanprover-community-mathlib4-bot', 'meithecatte']	nobody	151-14978 4 months ago	151-14983 4 months ago	0-179 2 minutes
16553	grunweg author:grunweg	WIP: tinkering with orientable manifolds	- wait for Rida's PR to get merged - PR the "normed space" part separately - WIP: a linear isomorphism on a connected set is either orientation-preserving or orientation-preserving: this will require #8738, it seems - [ ] depends on: #16239 - [ ] depends on: #8738 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR WIP	287/0	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/Orientable.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	148-18156 4 months ago	386-67421 1 year ago	0-0 0 seconds
24550	grunweg author:grunweg	feat: define `SliceModel` typeclass for models with corners for embedded submanifolds	Still work in progress: TODO write a proper module doc-string and commit message. --- - [ ] depends on: #23040 (at least morally) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	1214/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MSplits.lean,Mathlib/Geometry/Manifold/SliceModel.lean	6	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	148-12241 4 months ago	148-12673 4 months ago	0-0 0 seconds
18755	FR-vdash-bot author:FR-vdash-bot	refactor: deprecate `LinearIsometryClass`	--- - [ ] depends on: #18748 - [ ] depends on: #18754 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis merge-conflict blocked-by-other-PR label:t-algebra$	243/116	Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,Mathlib/Topology/Homeomorph.lean,Mathlib/Topology/MetricSpace/Isometry.lean,scripts/no_lints_prime_decls.txt	13	5	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	147-21687 4 months ago	322-64348 10 months ago	0-602 10 minutes
5863	eric-wieser author:eric-wieser	feat: add elaborators for concrete matrices	--- - [x] depends on: #5866 - [ ] depends on: #5897 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta blocked-by-other-PR help-wanted	257/7	Mathlib/Control/Monad/Cont.lean,Mathlib/Data/Matrix/Auto.lean,MathlibTest/matrix_auto.lean	3	7	['eric-wieser', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	132-16482 4 months ago	132-16503 4 months ago	0-0 0 seconds
25141	eric-wieser author:eric-wieser	feat: basis for multilinear maps	This attempts to tease an intermediate result out of #11155, which lets us show that multilinear maps are free even if their codomain is not finite. I guess this continues from https://github.com/leanprover-community/mathlib3/pull/10504 and https://github.com/leanprover-community/mathlib3/pull/14199. --- - [ ] depends on: #11155 - [ ] depends on: #25142 - [ ] depends on: #25169 - [ ] depends on: #25166 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	507/45	Mathlib.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/DFinsupp/PiTensorProduct.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/DirectSum/PiTensorProduct.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basis.lean,Mathlib/LinearAlgebra/Multilinear/DFinsupp.lean,Mathlib/LinearAlgebra/Multilinear/DirectSum.lean,Mathlib/LinearAlgebra/Multilinear/FiniteDimensional.lean,Mathlib/LinearAlgebra/Multilinear/Pi.lean	11	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	127-36285 4 months ago	127-36286 4 months ago	0-0 0 seconds
25750	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): bicategory extension for `rotate_isos`	This PR registers some lemmas to the `rotate_isos` tactic so that it applies in bicategorical contexts. For instance, if `α : g ⟶ h` is an invertible 2-cells, the term `f ◁ α ` is also recognized as invertible, with inverse `f ◁ α' `, where `α'` is the expression for the inverse constructed by the tactic. Without this extension, the tactic would only construct the generic `inv (f ◁ α)` as inverse for this term. --- - [ ] depends on: #25747 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24633. Original PR: https://github.com/leanprover-community/mathlib4/pull/24633	t-category-theory t-meta blocked-by-other-PR	1206/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Bicategory.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Core.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,MathlibTest/CategoryTheory/RotateIsos.lean,scripts/noshake.json	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	113-65755 3 months ago	113-65924 3 months ago	0-0 0 seconds
25748	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): Initial lemmas for the `rotate_iso` tactic	This PR records an initial set of lemmas to be used by the WIP `rotate_isos` tactic. --- - [ ] depends on: #25746 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24506. Original PR: https://github.com/leanprover-community/mathlib4/pull/24506	t-meta blocked-by-other-PR	496/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,scripts/noshake.json	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	113-65754 3 months ago	113-65755 3 months ago	0-0 0 seconds
25747	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): the `rotate_isos` tactic	We define a `rotate_isos` tactic for category theory in mathlib. At its core, the tactic transform terms of type `α(1) ≫ ⋯ ≫ α(k) = β(1) ≫ ⋯ ≫ β(l)` where `α` and `β` are families of morphisms in whith the first `i` morphisms of the left-hand side and the last `j` morphisms of the right-hand side are isomorhisms, into terms of type `α(k-i) ≫ ⋯ ≫ α(k) ≫ inv β(l) ≫ ⋯ ≫ β(l-j+1) = inv α(j) ≫ ⋯ ≫ inv α(1) ≫⋯ ≫ β(l-j)`. The construction of the inverses of expression are caried at the `Expr` levels are built out of the expressions of the morphisms, for instance, for this tactic, the inverse of `F.map (G.map (H.map f.hom)))` will directly be `F.map (G.map (H.map f.inv)))` (which would have to be re-simplified), rather than an `inv` term form an `IsIso` instance. The tactic can be applied at a local hypothesis or at the main goal, or can be used through a `rotate_isos%` term elaborator if e.g one wants to add such a "rotated" form to a `simp` or `rw` call. We also support removing morphisms "from the right" of the lhs, rather than from the right. --- The motivations behind this tactic are the following : - This tactic can "autogenerate" lemmas and terms generalizing lemmas such as [CategoryTheory.Iso.hom_inv_id_app_app_app](https://leanprover-community.github.io/mathlib4_docs/Mathlib/CategoryTheory/NatIso.html#CategoryTheory.Iso.hom_inv_id_app_app_app). This can also generate lemmas `F.map (G.map f.hom) ≫F.map (G.map f.inv) = 𝟙 _`, and can be used to unlock a `simp` call that blocks at an expression of the form `F.map (G.map f.hom) ≫F.map (G.map f.inv) `. - Currently, cancelling morphisms "from the right" in an expression in category theory is a bit of a pain. You have to first reassociate the expression, perform multiple calls to `Iso.inv_comp_eq`, reassociate, etc. This at least automates this process in a fairly straightforward way. - There are expressions in category theory that have no "right forms", e.g the pentagon axiom for monoidal categories, which has many variations in the way one can read the diagram of isomorphisms that represents it. Elaborators such as `rotate_iso%` easily generates all possible forms of such identities from one single form, and avoids having to state multiple forms of the same equality as individual lemmas. - I have been playing with medium-sized diagrams of isomorphisms recently (think for example vertical/horizontal compositions of `CatCommSq`, whiskering a corner of such diagrams, etc.), and it made me wish a lot of time that such easy way to transforms equalities to equivalent forms were available. - [ ] depends on: #25746 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24454. Original PR: https://github.com/leanprover-community/mathlib4/pull/24454	t-category-theory t-meta awaiting-author blocked-by-other-PR WIP	871/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Core.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,MathlibTest/CategoryTheory/RotateIsos.lean,scripts/noshake.json	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	113-65754 3 months ago	113-66007 3 months ago	0-0 0 seconds
25751	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): monoidal extension of `rotate_isos`	This PR registers some lemmas to the `rotate_isos` tactic so that it applies in monoidal contexts. For instance, if α : y ⟶ z is an invertible morphism, the term x ◁ α is also recognized as invertible, with inverse x ◁ α' , where α' is the expression for the inverse constructed by the tactic. Without this extension, the tactic would only construct the generic inv (x ◁ α) as inverse for this term. We also take care of terms of the form `f ⊗ g` --- - [ ] depends on: #25747 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24634. Original PR: https://github.com/leanprover-community/mathlib4/pull/24634	t-category-theory t-meta blocked-by-other-PR	1362/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Core.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Monoidal.lean,MathlibTest/CategoryTheory/RotateIsos.lean,scripts/noshake.json	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	113-64773 3 months ago	113-65619 3 months ago	0-0 0 seconds
25752	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): whiskering lemmas for `rotate_isos`	This PR extends the base set of terms recognized by the `rotate_isos` tactic to include terms of the form `whiskerLeft F f`, `isoWhiskerLeft F e`, and `NatTrans.hcomp`/ `NatIso.hcomp`. --- - [ ] depends on: #25747 Technically, it could depend solely on #24506, but there’s not much point getting this merged if the base tactic is not there. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24650. Original PR: https://github.com/leanprover-community/mathlib4/pull/24650	t-meta blocked-by-other-PR	1365/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Core.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,MathlibTest/CategoryTheory/RotateIsos.lean,scripts/noshake.json	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	113-64774 3 months ago	113-64775 3 months ago	0-0 0 seconds
25912	BoltonBailey author:BoltonBailey	feat: add simp lemmas for trig functions on `π * 2⁻¹`	This PR adds a number of simp lemmas to reduce trig functions evaluated on `π * 2⁻¹`. This allows `simp` to reduce expressions such as `sin (π * (1 / 2))` --- - [ ] depends on: #25911 [experiment with simp normal form] Original PR: #24213	t-analysis awaiting-author blocked-by-other-PR	45/0	Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean	1	3	['BoltonBailey', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	110-39866 3 months ago	110-40462 3 months ago	0-136 2 minutes
18771	joelriou author:joelriou	feat(LinearAlgebra/ExteriorPower): exterior powers of free modules are free	Co-authored-by: sophie.morel@ens-lyon.fr --- - [ ] depends on: #18662 - [x] depends on: #18534 - [x] depends on: #18651 - [x] depends on: #18590 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR WIP label:t-algebra$	1185/160	Mathlib.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basis.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/ExteriorPower/Pairing.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/TensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/LinearAlgebra/TensorAlgebra/ToTensorPower.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/LinearAlgebra/TensorPower/Pairing.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean	19	3	['alreadydone', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	106-62021 3 months ago	322-64347 10 months ago	0-0 0 seconds
25926	BoltonBailey author:BoltonBailey	feat: add lemma about `degreeOf_eq_degree`	Adds MvPolynomial.degreeOf_eq_degree, which states that the degree of a particular variable in a multivariate polynomial is equal to the degree of the single-variable polynomial obtained by treating the multivariable polynomial as a single variable polynomial over multivariable polynomials in the remaining variables. This PR continues the work from #12664. - [ ] depends on: #25920 depends on https://github.com/leanprover-community/mathlib4/pull/25920	t-algebra blocked-by-other-PR label:t-algebra$	50/0	Mathlib/Algebra/MvPolynomial/Equiv.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	105-35976 3 months ago	105-35977 3 months ago	5-1720 5 days
25925	BoltonBailey author:BoltonBailey	feat: file for lemmas about MvPolynomials over NoZeroDivisors	This PR continues the work from #11106 and #11073 Original PR: https://github.com/leanprover-community/mathlib4/pull/11106 - [x] depends on: #11095 - [x] depends on: #11094 - [ ] depends on: #25926 [We need this lemma to establish fact about degreeOf n (p + q)]	t-algebra blocked-by-other-PR label:t-algebra$	85/0	Mathlib/Algebra/MvPolynomial/NoZeroDivisors.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	104-14577 3 months ago	104-14578 3 months ago	0-0 0 seconds
20051	Timeroot author:Timeroot	feat: `Clone` and some instances	Defines clones (`Clone`). And there is a file, `Instances.lean`, that gives several most important examples of Clones. In particular, it has all of the clones (in an appropriately general form) that occur in [Post's Lattice](https://en.wikipedia.org/wiki/Post%27s_lattice), and [later proving](https://github.com/leanprover-community/mathlib4/pull/24744) the completeness of Post's Lattice is why I'm making this PR. (Edit: Used to also say "Defined operads (`Operad`), symmetric operads (`SymmOperad`), and clones ... There is a proof that all clones have a natural operad structure.". This has been scrapped.) --- - [x] depends on: #20133 [basics and notations] - [x] depends on: #20134 [permutations] - [x] depends on: #20138 [operad] - [x] depends on: #20141 [clone] - [x] depends on: #23459 [defs] - [ ] depends on: #23460 [basic] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author blocked-by-other-PR label:t-algebra$	623/0	Mathlib.lean,Mathlib/Algebra/Clone/Basic.lean,Mathlib/Algebra/Clone/Defs.lean,Mathlib/Algebra/Clone/Instances.lean,Mathlib/Data/Fin/Basic.lean	5	32	['Timeroot', 'YaelDillies', 'eric-wieser', 'github-actions', 'jcommelin', 'kbuzzard', 'kim-em', 'mathlib4-dependent-issues-bot', 'wmacmil']	nobody	101-84246 3 months ago	187-25486 6 months ago	43-16103 43 days
26391	grunweg author:grunweg	feat: immersed submanifolds	Still under construction --- - [ ] depends on: #26087 - [ ] depends on: #23040 Better version of #24549. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR WIP	1418/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean,Mathlib/Geometry/Manifold/EmbeddedSubmanifold.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/MSplits.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	100-28405 3 months ago	100-80712 3 months ago	0-0 0 seconds
18662	joelriou author:joelriou	feat(LinearAlgebra/ExteriorPower): generators of the exterior powers	--- - [x] depends on: #18534 - [x] depends on: #18590 - [ ] depends on: #26464 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR WIP label:t-algebra$	818/158	Mathlib.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/TensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean	15	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	98-68476 3 months ago	322-64351 10 months ago	0-0 0 seconds
18735	joelriou author:joelriou	feat(Algebra/Module): presentation of the exterior power	Given a presentation of a `R`-module `M`, we obtain a presentation of `⋀[R]^n M`. --- (Still one sorry left.) - [ ] depends on: #18527 - [ ] depends on: #18432 - [ ] depends on: #26464 - [ ] depends on: #18534 - [ ] depends on: #18662 - [x] depends on: #18590 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR WIP label:t-algebra$	1856/157	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ExteriorPower.lean,Mathlib/Algebra/Module/Presentation/Basic.lean,Mathlib/Algebra/Module/Presentation/ExteriorPower.lean,Mathlib/Algebra/Module/Presentation/PiTensor.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/TensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean	20	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	98-64450 3 months ago	322-64349 10 months ago	0-0 0 seconds
18551	joelriou author:joelriou	feat(AlgebraicGeometry): the algebraic De Rham complex	If `B` is an `A`-algebra, we construct the algebraic De Rham complex of `B` over `A`: it is a cochain complex of `A`-modules. --- - [ ] depends on: #18735 - [ ] depends on: #18662 - [ ] depends on: #26464 - [ ] depends on: #18534 - [ ] depends on: #18527 - [x] depends on: #18440 - [ ] depends on: #18432 - [x] depends on: #18408 - [x] depends on: #18389 - [x] depends on: #18374 - [x] depends on: #18359 - [x] depends on: #18332 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-algebraic-geometry merge-conflict blocked-by-other-PR WIP label:t-algebra$	2836/156	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ExteriorPower.lean,Mathlib/Algebra/Module/Presentation/Basic.lean,Mathlib/Algebra/Module/Presentation/Cokernel.lean,Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/Algebra/Module/Presentation/DirectSum.lean,Mathlib/Algebra/Module/Presentation/ExteriorPower.lean,Mathlib/Algebra/Module/Presentation/PiTensor.lean,Mathlib/Algebra/Module/Presentation/RestrictScalars.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/TensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/DeRham/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean	26	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	98-64446 3 months ago	unknown	unknown
26149	vasnesterov author:vasnesterov	feat(Topology): continuous surjection from Cantor set to Hilbert cube	--- - [ ] depends on: #26136 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology merge-conflict blocked-by-other-PR	752/0	Mathlib.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Data/Nat/Cast/Order/Field.lean,Mathlib/Data/Real/OfDigits.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/Instances/CantorSet.lean,Mathlib/Topology/MetricSpace/HausdorffAlexandroff.lean,scripts/noshake.json	8	5	['alreadydone', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'vasnesterov']	nobody	90-78259 2 months ago	90-78260 2 months ago	0-2240 37 minutes
26184	vasnesterov author:vasnesterov	feat(Topology): every compact metric space is image of Cantor set	--- - [ ] depends on: #26027 - [ ] depends on: #26149 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology merge-conflict blocked-by-other-PR	869/0	Mathlib.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Data/Nat/Cast/Order/Field.lean,Mathlib/Data/Real/OfDigits.lean,Mathlib/Topology/Compactness/HilbertCubeEmbedding.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/Instances/CantorSet.lean,Mathlib/Topology/MetricSpace/HausdorffAlexandroff.lean,scripts/noshake.json	9	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	90-78254 2 months ago	90-78255 2 months ago	0-602 10 minutes
26185	vasnesterov author:vasnesterov	feat(Counterexamples): Peano curve	Prove the existence of a continuous surjection from `unitInterval` onto `unitInterval × unitInterval`. --- - [ ] depends on: #26184 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology merge-conflict blocked-by-other-PR	927/0	Counterexamples.lean,Counterexamples/PeanoCurve.lean,Mathlib.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Data/Nat/Cast/Order/Field.lean,Mathlib/Data/Real/OfDigits.lean,Mathlib/Topology/Compactness/HilbertCubeEmbedding.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/Instances/CantorSet.lean,Mathlib/Topology/MetricSpace/HausdorffAlexandroff.lean,scripts/noshake.json	11	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	90-78253 2 months ago	90-78254 2 months ago	0-1381 23 minutes
26395	winstonyin author:winstonyin	feat: $C^1$ vector fields on compact manifolds define global flows	This PR continues the work from #22254. Original PR: https://github.com/leanprover-community/mathlib4/pull/22254 Any $C^1$ vector field on a compact boundaryless manifold `M` defines a unique global flow `ℝ → M → M`. - [ ] depends on: #26394 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	841/406	Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Order/Filter/Prod.lean,docs/1000.yaml,docs/undergrad.yaml	7	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'winstonyin']	nobody	90-78117 2 months ago	90-78117 2 months ago	0-52 52 seconds
26465	joelriou author:joelriou	feat(Algebra/Module): presentation of the `PiTensorProduct`	Given a presentation of a finite number of `R`-modules `M i`, we obtain a presentation of the module `⨂[R] i, M i`. --- - [ ] depends on: #26464 This PR continues the work from #18527. Original PR: https://github.com/leanprover-community/mathlib4/pull/18527	file-removed t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	525/4	Mathlib.lean,Mathlib/Algebra/Module/Presentation/PiTensor.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Set/ComplSingletonLift.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean,Mathlib/SetTheory/Cardinal/Finite.lean	10	4	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	90-77987 2 months ago	90-77988 2 months ago	0-2063 34 minutes
26467	joelriou author:joelriou	feat(LinearAlgebra): the tensor product of a finite family of free modules is free	--- - [ ] depends on: #26464 - [ ] depends on: #26465 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-algebra merge-conflict blocked-by-other-PR WIP label:t-algebra$	607/7	Mathlib.lean,Mathlib/Algebra/Module/Presentation/Free.lean,Mathlib/Algebra/Module/Presentation/PiTensor.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Set/ComplSingletonLift.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basis.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean,Mathlib/SetTheory/Cardinal/Finite.lean	12	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	90-77985 2 months ago	90-77986 2 months ago	0-2 2 seconds
26168	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure) : variation defined as a supremum is equal to variation defined using the Hahn-Jordan decomposition.	Add `signedMeasure_totalVariation_eq`: if `μ` is a `SignedMeasure` then variation defined as a supremum is equal to variation defined using the Hahn-Jordan decomposition. Co-authored-by: @yoh-tanimoto - [ ] depends on: #26165 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability blocked-by-other-PR	680/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Equiv.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	90-62175 2 months ago	90-62704 2 months ago	15-65390 15 days
26165	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure): add lemma which shows that variation of a `ℝ≥0∞` VectorMeasure is equal to itself	Add a lemma for the variation of a VectorMeasure which tells that if `μ` is `VectorMeasure X ℝ≥0∞` then `variation μ = μ`. Co-authored-by: @yoh-tanimoto - [ ] depends on: #26160 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability blocked-by-other-PR	467/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	3	1	['github-actions']	nobody	90-62175 2 months ago	90-62731 2 months ago	15-66224 15 days
26160	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure): add several lemmas which characterize variation	Add the following lemmas concerning variation of a VectorMeasure: * `norm_measure_le_variation`: `‖μ E‖ₑ ≤ variation μ E`. * `variation_neg`: `(-μ).variation = μ.variation`. * `variation_zero`: `(0 : VectorMeasure X V).variation = 0`. * `absolutelyContinuous` Co-authored-by: @yoh-tanimoto - [ ] depends on: #26156 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability blocked-by-other-PR	432/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	90-62174 2 months ago	90-62783 2 months ago	15-68781 15 days
24912	YaelDillies author:YaelDillies	feat: affine monoids	Define affine monoids as finitely generated cancellative torsion-free commutative monoids and prove a few of their basic properties: * An affine monoid with no non-trivial unit is generated by its irreducible elements * An affine monoid embeds into `ℤⁿ` for some `n` * Let `M` be an affine monoid. If `R` is a domain, then so is `R[M]`. From Toric Co-authored-by: Patrick Luo --- - [x] depends on: #24913 - [x] depends on: #24914 - [ ] depends on: #26110 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra blocked-by-other-PR label:t-algebra$	214/0	Mathlib.lean,Mathlib/Algebra/AffineMonoid/Basic.lean,Mathlib/Algebra/AffineMonoid/Embedding.lean,Mathlib/Algebra/AffineMonoid/Irreducible.lean,Mathlib/Algebra/AffineMonoid/UniqueSums.lean	5	15	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'smorel394']	nobody	90-54671 2 months ago	107-36883 3 months ago	7-26907 7 days
24627	pechersky author:pechersky	feat(Topology/Algebra/Valued): `IsLinearTopology 𝒪[K] K` and `𝒪[K] 𝒪[K]`	as well as `IsLinearTopology ℤ_[p] ℤ_[p]` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #26829	t-topology merge-conflict awaiting-author blocked-by-other-PR	376/30	Mathlib.lean,Mathlib/NumberTheory/Padics/LinearTopology.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Integers.lean,Mathlib/Topology/Algebra/Valued/LinearTopology.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean	8	41	['ADedecker', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'loefflerd', 'mathlib4-dependent-issues-bot', 'pechersky']	nobody	89-17423 2 months ago	90-80816 2 months ago	19-50489 19 days
10654	smorel394 author:smorel394	feat(LinearAlgebra/{ExteriorPower,LinearIndependent,TensorPower}): define the exterior powers of a module and prove some of their basic properties	This introduces the exterior powers of a module and proves some of their basic properties, in `LinearAlgebra/ExteriorPower/Basic.lean` and `LinearAlgebra/ExteriorPower/Generators.lean`. It also adds a lemma in `LinearAlgebra/LinearIndependent.lean` (`linearIndependent_of_dualFamily` : if a family of vectors admits a "dual" family of linear forms, then it is linearly independent) and a construction in `LinearAlgebra/TensorPower.lean` (`linearFormOfFamily` : the linear form on the tensor power of `M` obtained by multiplying a family of linear forms on `M`). # Main definitions ## In `LinearAlgebra/ExteriorPower/Basic.lean`: * `ExteriorPower R n M` is the `n`th exterior power of a `R`-module `M`, defined as `LinearMap.range (ExteriorAlgebra.ι R : M →ₗ[R] ExteriorAlgebra R M) ^ n`. We also introduce the notation `Λ[R]^n M` for `ExteriorPower R n M`. * `ExteriorPower.ιMulti` is the canonical alternating map on `M` with values in `Λ[R]^n M`. * `ExteriorPower.map`: functoriality of exterior powers with respect to linear maps between modules. * `ExteriorPower.toTensorPower`: linear map from the `n`th exterior power to the `n`th tensor power (coming from `MultilinearMap.alternatization` via the universal property of exterior powers). ## In `LinearAlgebra/ExteriorPower/Generators.lean`: * `ExteriorPower.BasisOfBasis`: If `b` is a basis of `M` (indexed by a linearly ordered type), the basis of the `n`th exterior power of `M` formed by the `n`-fold exterior products of elements of `b`. # Main theorems ## In `LinearAlgebra/ExteriorPower/Basic.lean`: * The image of `ExteriorPower.ιMulti` spans `Λ[R]^n M`. * `ExteriorPower.liftAlternatingEquiv` (universal property of the `n`th exterior power of `M`): the linear equivalence between linear maps from `Λ[R]^n M` to a module `N` and `n`-fold alternating maps from `M` to `N`. * `ExteriorPower.map_injective_field`: If `f : M →ₗ[R] N` is injective and `R` is a field, then `ExteriorPower.map n f` is injective. * `ExteriorPower.map_surjective`: If `f : M →ₗ[R] N` is surjective, then `ExteriorPower.map n f` is surjective. * `ExteriorPower.mem_exteriorPower_is_mem_finite`: Every element of `Λ[R]^n M` is in the image of `Λ[R]^n P` for some finitely generated submodule `P` of `M`. ## In `LinearAlgebra/ExteriorPower/Generators.lean`: * `ExteriorPower.Finite`: The `n`th exterior power of a finite module is a finite module. * `ExteriorPower.span_top_of_span_top` and `ExteriorPower.span_top_of_span_top'`: If a family of vectors spans `M`, then the family of its `n`-fold exterior products spans `Λ[R]^n M`. (We give versions in the exterior algebra and in the exterior power.) * `ExteriorPower.FreeOfFree`: If `M` is a free module, then so is its `n`th exterior power. * `ExteriorPower.FinrankOfFiniteFree`: If `R` satisfies the strong rank condition and `M` is finite free of rank `r`, then the `n`th exterior power of `M` is of finrank `Nat.choose r n`. * `ExteriorPower.ιMulti_family_linearIndependent_field`: If `R` is a field, and if `v` is a linearly independent family of vectors (indexed by a linearly ordered type), then the family of its `n`-fold exterior products is also linearly independent. - [x] depends on: #10744 - [ ] depends on: #11156 - [x] depends on: #18590 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict please-adopt blocked-by-other-PR label:t-algebra$	739/0	Mathlib.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/LinearAlgebra/TensorPower.lean	5	46	['Ruben-VandeVelde', 'YaelDillies', 'bustercopley', 'eric-wieser', 'github-actions', 'joelriou', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball', 'pink10000', 'smorel394']	eric-wieser assignee:eric-wieser	80-76682 2 months ago	303-22064 9 months ago	22-67320 22 days
26884	alreadydone author:alreadydone	Universal cover	--- - [ ] depends on: #24983 - [ ] depends on: #22771 - [ ] depends on: #22782 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict blocked-by-other-PR WIP	1126/359	Mathlib.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Geometry/Manifold/Sheaf/Smooth.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/EtaleSpace.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Homotopy/Product.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/Sheaves/LocalPredicate.lean,Mathlib/Topology/Sheaves/Sheafify.lean,Mathlib/Topology/Sheaves/Stalks.lean	20	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	80-62079 2 months ago	86-35529 2 months ago	0-0 0 seconds
26950	alreadydone author:alreadydone	Primitives of holomorphic functions and path integral	--- - [ ] depends on: #22782 - [x] depends on: #24983 - [ ] depends on: #22771 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis t-topology merge-conflict blocked-by-other-PR WIP	1288/361	Mathlib.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/Analysis/Complex/Primitive.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Geometry/Manifold/Sheaf/Smooth.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/EtaleSpace.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Homotopy/Product.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/Sheaves/LocalPredicate.lean,Mathlib/Topology/Sheaves/Sheafify.lean,Mathlib/Topology/Sheaves/Stalks.lean	21	n/a	['mathlib4-dependent-issues-bot']	nobody	80-58520 2 months ago	unknown	unknown
27070	vasnesterov author:vasnesterov	golf: use `order`	--- - [ ] depends on: #26580 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR WIP	619/466	Mathlib.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/ContinuedFractions/Computation/CorrectnessTerminating.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Homology/ShortComplex/Ab.lean,Mathlib/Algebra/Lie/Ideal.lean,Mathlib/Algebra/Lie/IdealOperations.lean,Mathlib/Algebra/Lie/Semisimple/Basic.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Division.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Indicator.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Order/Ring/IsNonarchimedean.lean,Mathlib/Algebra/Order/Star/Prod.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/CoeffMem.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Inductions.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Polynomial/Sequence.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/ValuativeCriterion.lean,Mathlib/AlgebraicTopology/SimplicialObject/Split.lean,Mathlib/Analysis/Calculus/Deriv/MeanValue.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/ConstantSpeed.lean,Mathlib/Analysis/Convex/StrictConvexBetween.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Meromorphic/FactorizedRational.lean,Mathlib/Analysis/Meromorphic/NormalForm.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/CategoryTheory/SmallObject/Iteration/ExtendToSucc.lean,Mathlib/CategoryTheory/Subpresheaf/Equalizer.lean,Mathlib/Combinatorics/Additive/Corner/Roth.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Girth.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/Partrec.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/FinEnum/Option.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Fintype/Perm.lean,Mathlib/Data/Int/WithZero.lean,Mathlib/Data/List/MinMax.lean,Mathlib/Data/Matroid/Basic.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Nat/Factors.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Data/Set/MemPartition.lean,Mathlib/Data/Sign.lean,Mathlib/Dynamics/TopologicalEntropy/Subset.lean,Mathlib/FieldTheory/Relrank.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/RingedSpace/Basic.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean,Mathlib/LinearAlgebra/ExteriorPower/Pairing.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Real.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Covering/LiminfLimsup.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Function/AEEqOfLIntegral.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean	224	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	80-41933 2 months ago	80-41934 2 months ago	0-10 10 seconds
26886	pechersky author:pechersky	feat(NumberTheory/Padics/ValuativeRel): ValuativeRel ℚ_[p]	as well as instances for IsRankLeOne, IsNontrivial, IsDiscrete --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #26827	t-algebra t-analysis t-number-theory merge-conflict blocked-by-other-PR WIP label:t-algebra$	310/25	Mathlib.lean,Mathlib/Analysis/Normed/ValuativeRel.lean,Mathlib/NumberTheory/Padics/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	4	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	80-13550 2 months ago	80-13550 2 months ago	0-1386 23 minutes
25834	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): girth-diameter inequality	This is a useful inequality that comes up in proofs related to Moore graphs, cages, SRGs, and so on. --- - [x] depends on: #26380 - [x] depends on: #25650 - [ ] depends on: #26614 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR WIP	825/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/GirthDiam.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	77-57900 2 months ago	101-11294 3 months ago	0-28 28 seconds
26973	peabrainiac author:peabrainiac	feat(Geometry/Diffeology): diffeologies generated from sets of plots	Introduces diffeologies generated from sets of plots, shows that this defines a Galois insertion, and concludes that the diffeologies on a type form a complete lattice. --- This PR continues the work from #22724. - [ ] depends on: #26484	t-differential-geometry blocked-by-other-PR	629/0	Mathlib.lean,Mathlib/Geometry/Diffeology/Basic.lean,docs/references.bib	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'peabrainiac']	nobody	77-19516 2 months ago	85-35190 2 months ago	0-785 13 minutes
27274	peabrainiac author:peabrainiac	feat(Geometry/Diffeology): continuous diffeologies & D-topology-lemmas	Introduces the continuous diffeology on topological spaces and the Galois connection between it and the D-topology, and then uses it to prove a few more lemmas about the D-topology. --- Aside from being useful for defining a right adjoint of the D-topology functor later, this is a prerequisite for correctly defining coinduced diffeologies (namely in such a way that the D-topology is defeq to the coinduced topology) and thus also for most constructions of diffeological spaces. - [ ] depends on: #26973 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR	766/0	Mathlib.lean,Mathlib/Geometry/Diffeology/Basic.lean,Mathlib/Geometry/Diffeology/Continuous.lean,docs/references.bib	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	77-209 2 months ago	77-210 2 months ago	0-1796 29 minutes
25848	joelriou author:joelriou	feat/refactor: redefinition of homology + derived categories	This PR contains a redefinition of homology, theorems about localization of categories, including triangulated categories, a construction of the derived category of an abelian category, derived functors, spectral sequences, etc. (This is made a PR only to facilitate navigation in the code of this branch.) This formalization is outlined in the paper _Formalization of derived categories in Lean/mathlib_ https://hal.science/hal-04546712 The homology of `ShortComplex C` (diagrams of two composable morphisms whose composition is zero) is developed in `Algebra.Homology.ShortComplex`. The files in that folder have been added one by one in separate PRs, and then, the current definition of `homology` has been replaced by this new definition in a refactor PR. Homology refactor: * #4203 * #4204 * #4388 * #4609 * #4645 * #4787 * #4853 * #5250 * #5674 * #6008 * #6039 * #6089 * #6227 * #6230 * #6231 * #6245 * #6267 * #6279 * #6324 * #6443 * #6586 * #6994 * #7042 * #7047 * #7052 * #7192 * #7193 * #7194 * #7195 * #7197 * #7256 * #7262 * #7280 * #7623 * #7624 * #7806 * #7816 * #7817 * #7821 * #7954 * #7966 * #7993 * #7995 * #7996 * #7997 * #8058 * #8060 * #8069 * #8079 * #8081 * #8084 * #8091 * #8113 * #8114 * #8152 * #8159 * #8174 * #8200 * #8206 * #8208 * #8472 * #8468 * #8475 * #8490 * #8491 * #8507 * #8512 * #8593 * #8595 * #8706 * #8765 * #8766 * #8845 * #9022 * #12649 * #12638 Homological complexes: * #9333 * #9335 * #9331 Localization of categories: * #6233 * #6235 * #6236 * #6867 * #6869 * #6887 * #6882 * #8041 * #8055 * #8069 * #8516 * #8864 * #8865 * #9702 * #9692 * #10606 * #10607 * #11721 * #11728 * #11737 * #12728 Shifts on categories: * #4429 * #6652 * #6653 * #6655 * #7268 * #7270 * #9001 * #11764 Triangulated categories: * #6377 * #6688 * #6815 * #7053 * #7324 * #7327 * #7336 * #7626 * #7641 * #9049 * #9073 * #10527 * #11738 * #11740 * #11759 * #11786 * #11789 * #11805 * #12619 Construction of the derived category: * #6626 * #6701 * #6720 * #6894 * #7048 * #7049 * #7050 * #7201 * #7656 * #8937 * #8966 * #8969 * #8970 * #9054 * #9447 * #8951 * #9483 * #9508 * #9509 * #9592 * #9614 * #9615 * #9032 * #9370 * #9550 * #9686 * #9660 * #11760 * #11782 * #11806 Derived functors: * #10195 * #10270 * #10301 * #10384 * #10413 * #12168 * #12627 * #12631 * #12633 * #12785 * #12788 Refactor of Ext-groups: * #12607 - [ ] depends on: #24309 - [ ] depends on: #24275 - [x] depends on: #24191 - [ ] depends on: #23797 - [x] depends on: #22586 - [ ] depends on: #22556 - [ ] depends on: #22547 - [ ] depends on: #22539 - [ ] depends on: #22508 - [ ] depends on: #22450 - [ ] depends on: #23915 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #4197. Original PR: https://github.com/leanprover-community/mathlib4/pull/4197	large-import t-topology t-category-theory merge-conflict blocked-by-other-PR WIP	41795/490	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Free.lean,Mathlib/Algebra/Category/ModuleCat/LeftResolutions.lean,Mathlib/Algebra/Homology/Additive.lean,Mathlib/Algebra/Homology/BicomplexColumns.lean,Mathlib/Algebra/Homology/BicomplexRows.lean,Mathlib/Algebra/Homology/Bifunctor.lean,Mathlib/Algebra/Homology/BifunctorColimits.lean,Mathlib/Algebra/Homology/BifunctorCommShift.lean,Mathlib/Algebra/Homology/BifunctorFlip.lean,Mathlib/Algebra/Homology/BifunctorHomotopy.lean,Mathlib/Algebra/Homology/BifunctorMappingCone.lean,Mathlib/Algebra/Homology/BifunctorShift.lean,Mathlib/Algebra/Homology/BifunctorSingle.lean,Mathlib/Algebra/Homology/BifunctorTriangulated.lean,Mathlib/Algebra/Homology/CategoryWithHomology.lean,Mathlib/Algebra/Homology/CochainComplexMinus.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/ComplexShapeSigns.lean,Mathlib/Algebra/Homology/ConnectShortExact.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/DerivabilityStructureInjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Fractions.lean,Mathlib/Algebra/Homology/DerivedCategory/FullyFaithful.lean,Mathlib/Algebra/Homology/DerivedCategory/HomologySequence.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Minus.lean,Mathlib/Algebra/Homology/DerivedCategory/Monoidal.lean,Mathlib/Algebra/Homology/DerivedCategory/Plus.lean,Mathlib/Algebra/Homology/DerivedCategory/RightDerivedFunctorPlus.lean,Mathlib/Algebra/Homology/DerivedCategory/SingleTriangle.lean,Mathlib/Algebra/Homology/DerivedCategory/SpectralObject.lean,Mathlib/Algebra/Homology/DerivedCategory/TStructure.lean,Mathlib/Algebra/Homology/Double.lean,Mathlib/Algebra/Homology/DoubleHomology.lean,Mathlib/Algebra/Homology/Embedding/CochainComplex.lean,Mathlib/Algebra/Homology/Embedding/CochainComplexTrunc.lean,Mathlib/Algebra/Homology/Embedding/ComplementaryTrunc.lean,Mathlib/Algebra/Homology/Embedding/ExtendMap.lean,Mathlib/Algebra/Homology/Embedding/HomEquiv.lean,Mathlib/Algebra/Homology/Embedding/RestrictionHomology.lean,Mathlib/Algebra/Homology/Embedding/StupidFiltration.lean,Mathlib/Algebra/Homology/Embedding/StupidTrunc.lean,Mathlib/Algebra/Homology/Embedding/TruncGE.lean,Mathlib/Algebra/Homology/Embedding/TruncLE.lean,Mathlib/Algebra/Homology/Embedding/TruncLEHomology.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Homology/ExactSequenceFour.lean,Mathlib/Algebra/Homology/Factorizations/Basic.lean,Mathlib/Algebra/Homology/Factorizations/CM5a.lean,Mathlib/Algebra/Homology/Factorizations/CM5b.lean,Mathlib/Algebra/Homology/HomologicalBicomplex.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/HomologicalComplexFunctorEquiv.lean,Mathlib/Algebra/Homology/HomologicalComplexLimits.lean,Mathlib/Algebra/Homology/HomologicalComplexLimitsEventuallyConstant.lean,Mathlib/Algebra/Homology/Homology.lean,Mathlib/Algebra/Homology/HomologySequence.lean,Mathlib/Algebra/Homology/HomologySequenceLemmas.lean,Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Algebra/Homology/HomotopyCategory.lean,Mathlib/Algebra/Homology/HomotopyCategory/Cylinder.lean,Mathlib/Algebra/Homology/HomotopyCategory/DegreewiseSplit.lean,Mathlib/Algebra/Homology/HomotopyCategory/Devissage.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexShift.lean,Mathlib/Algebra/Homology/HomotopyCategory/KInjective.lean,Mathlib/Algebra/Homology/HomotopyCategory/MappingCone.lean,Mathlib/Algebra/Homology/HomotopyCategory/Minus.lean,Mathlib/Algebra/Homology/HomotopyCategory/Monoidal.lean,Mathlib/Algebra/Homology/HomotopyCategory/MonoidalTriangulated.lean,Mathlib/Algebra/Homology/HomotopyCategory/Plus.lean,Mathlib/Algebra/Homology/HomotopyCategory/PreservesQuasiIso.lean,Mathlib/Algebra/Homology/HomotopyCategory/Pretriangulated.lean,Mathlib/Algebra/Homology/HomotopyCategory/Shift.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShiftSequence.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomotopyCategory/SingleFunctors.lean,Mathlib/Algebra/Homology/HomotopyCategory/SpectralObject.lean,Mathlib/Algebra/Homology/HomotopyFiber.lean,Mathlib/Algebra/Homology/LeftResolutions/Basic.lean,Mathlib/Algebra/Homology/LeftResolutions/CochainComplex.lean,Mathlib/Algebra/Homology/LeftResolutions/CochainComplexMinus.lean,Mathlib/Algebra/Homology/LeftResolutions/Reduced.lean,Mathlib/Algebra/Homology/LeftResolutions/Transport.lean,Mathlib/Algebra/Homology/Localization.lean,Mathlib/Algebra/Homology/Monoidal.lean,Mathlib/Algebra/Homology/ObjectProperty.lean,Mathlib/Algebra/Homology/PreservesQuasiIso.lean,Mathlib/Algebra/Homology/QuasiIso.lean,Mathlib/Algebra/Homology/Refinements.lean,Mathlib/Algebra/Homology/ShortComplex/Abelian.lean,Mathlib/Algebra/Homology/ShortComplex/Basic.lean,Mathlib/Algebra/Homology/ShortComplex/Exact.lean,Mathlib/Algebra/Homology/ShortComplex/FiveLemma.lean,Mathlib/Algebra/Homology/ShortComplex/FourLemma.lean,Mathlib/Algebra/Homology/ShortComplex/HomologicalComplex.lean,Mathlib/Algebra/Homology/ShortComplex/Images.lean,Mathlib/Algebra/Homology/ShortComplex/Preadditive.lean	295	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	72-41561 2 months ago	unknown	unknown
19607	madvorak author:madvorak	Block matrix totally unimodular	--- Discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/TU.20block.20matrix.20.2319607 - [ ] depends on: #19323 - [ ] depends on: #20428 - [ ] depends on: #20433 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR WIP	156/0	Mathlib.lean,Mathlib/Data/Sum/Decompose.lean,Mathlib/LinearAlgebra/Matrix/Determinant/TotallyUnimodular.lean	3	11	['github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'madvorak', 'mathlib4-dependent-issues-bot']	nobody	71-60891 2 months ago	71-60892 2 months ago	0-0 0 seconds
26987	joelriou author:joelriou	chore: deprecating module LinearAlgebra.PiTensorProduct	--- - [ ] depends on: #26464 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR WIP label:t-algebra$	1209/934	Mathlib.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/SubtypeNeLift.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean,Mathlib/SetTheory/Cardinal/Finite.lean	10	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	71-59291 2 months ago	71-59291 2 months ago	0-2 2 seconds
24668	robertmaxton42 author:robertmaxton42	feat(LinearAlgebra): add inductive principle for the free product of algebras	* Add `FreeProduct.inductionOn` and `.asPowers.inductionOn`. - [ ] depends on: #24532 --- * `simp↓` on `empty_rel'_bot`: the LHS is indeed not in simp-normal form, but `simp` can't solve the full lemma (if only because `Function.onFun` isn't marked `@[simp]`) and the actual simp-normal form of `rel'` isn't terribly useful for humans. Since I do expect users to type `rel' R A` by hand, I claim this use of `simp↓` is justified. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	205/9	Mathlib/LinearAlgebra/FreeProduct/Basic.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	70-2460 2 months ago	70-2461 2 months ago	0-333 5 minutes
27025	grunweg author:grunweg	feat: Gram-Schmidt procedure on smooth vector bundles yields smooth sections	For the Gram-Schmidt process on a vector bundle, deduce that smoothness of the bundle metric implies smoothness of the resulting sections. From the path towards geodesics and the Levi-Civita connection. Co-authored-by: Patrick Massot --- A few sorries remain to prove the continuous case. - [ ] depends on: #27021 - [x] depends on: #27023 - [ ] depends on: #27024 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR	927/11	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Geometry/Manifold/Elaborators.lean,Mathlib/Geometry/Manifold/Traces.lean,Mathlib/Geometry/Manifold/VectorBundle/GramSchmidtOrtho.lean,scripts/noshake.json	6	5	['faenuccio', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	65-31613 2 months ago	66-44441 2 months ago	0-316 5 minutes
27694	grunweg author:grunweg	feat: Gram-Schmidt orthonormalisation preserves continuity of sections	provided the bundle metric used in the process is continuous. From the path towards geodesics and the Levi-Civita connection. Co-authored-by: Patrick Massot [patrickmassot@free.fr](mailto:patrickmassot@free.fr) --- - [ ] depends on: #27024 - [ ] depends on: #27021 Baby version of #27025. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR	390/11	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Geometry/Manifold/VectorBundle/GramSchmidtOrtho.lean,scripts/noshake.json	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	65-30884 2 months ago	65-30884 2 months ago	0-696 11 minutes
10006	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): homotopy in quasicategories	Defined a homotopy between two 1-simplicies in a quasicategories, and proved the property of being homotopic forms an equivalence relation. --- - [ ] depends on: #9935 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict awaiting-author blocked-by-other-PR	898/1	Mathlib.lean,Mathlib/AlgebraicTopology/Homotopy.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SimplicialSet.lean	4	3	['joelriou', 'leanprover-community-mathlib4-bot']	nobody	64-52366 2 months ago	64-52366 2 months ago	0-0 0 seconds
25740	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/GeneratorsRelations): `SimplexCategoryGenRel.toSimplexCategory` is an equivalence	We use the normal forms for morphisms in `SimplexCategoryGenRel` to prove that `SimplexCategoryGenRel.toSimplexCategory` is an equivalence. We prove in order that there exists unique lifts in `SimplexCategoryGenRel` of mono (resp. epis) in `SimplexCategory`, and use this to deduce fully faithfulness of `SimplexCategoryGenRel.toSimplexCategory` thanks to the existing epi-mono factorisation in `SimplexCategory`. Part of a series of PR formalising that `SimplexCategoryGenRel` is equivalent to `SimplexCategory`. --- - [ ] depends on: #25737 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #21747. Original PR: https://github.com/leanprover-community/mathlib4/pull/21747	t-algebraic-topology large-import blocked-by-other-PR	942/9	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Equivalence.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	64-52325 2 months ago	64-52326 2 months ago	0-2 2 seconds
26399	ChrisHughes24 author:ChrisHughes24	refactor(ModelTheory): tidy up proof of Ax-Grothendieck with definable functions	I migrated this 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: #20180 - [x] depends on: #21948 - [ ] depends on: #26398 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic blocked-by-other-PR	639/60	Mathlib.lean,Mathlib/FieldTheory/AxGrothendieck.lean,Mathlib/ModelTheory/FunctionalFormula.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	63-46567 2 months ago	63-46640 2 months ago	0-2300 38 minutes
20008	FLDutchmann author:FLDutchmann	feat(NumberTheory): Selberg sieve	This PR is a working draft of the full proof of the fundamental theorem of the Selberg sieve. I will create dependent PRs as I clean up the code. This work was used in the first proof of the prime number theorem in PNT+. --- - [x] depends on: #20025 - [x] depends on: #20026 - [x] depends on: #20779 - [x] depends on: #21880 - [ ] depends on: #27702 - [ ] depends on: #27707 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis t-number-theory merge-conflict awaiting-author blocked-by-other-PR	937/0	Mathlib/NumberTheory/SelbergSieve/Basic.lean,Mathlib/NumberTheory/SelbergSieve/Selberg.lean,docs/references.bib	3	3	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	63-37873 2 months ago	63-37874 2 months ago	0-0 0 seconds
25486	VTrelat author:VTrelat	feat(SetTheory/ZFC/Integers): define integers in ZFC	Extend the model of ZFC with integers following the converse direction as for naturals. We first define a type and then build a set. We finally show that both representations have coercions in both direction: - define a proper type `ZFInt` representing integers based on `ZFNat × ZFNat` and following the usual construction of integers - add theorems on usual algebraic properties of integers - define a set `Int` and show that it matches-i.e. that it is isomorphic to-the type `ZFInt` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483 - [ ] depends on: #25485	t-set-theory new-contributor merge-conflict blocked-by-other-PR	2003/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Integers.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	60-58930 1 month ago	60-58930 1 month ago	0-2067 34 minutes
25484	VTrelat author:VTrelat	feat(SetTheory/ZFC/Booleans): define Boolean algebra in ZFC	Extend the model of ZFC with Boolean algebra: - define a set 𝔹 of booleans - define a proper type `ZFBool` representing booleans - add theorems on usual algebraic properties of booleans - provide usual boolean notations like `⊤`, `⊥`, `∧`, `∨`, etc. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483	t-set-theory new-contributor merge-conflict blocked-by-other-PR	619/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	60-58921 1 month ago	60-58921 1 month ago	0-1523 25 minutes
25427	Paul-Lez author:Paul-Lez	feat(Analysis/Calculus/PartialDerivatives): Propose notation for partial derivatives.	This PR introduces a notation for partial derivatives, taken with respect to a canonical basis. The idea here is that this might be useful for e.g. writing down PDEs. The notation allows use to write things like ```lean -- The canonical basis for `ℝ × ℝ` is indexed by `Fin 0` so `∂₀[ℝ]` corresponds to taking -- the first partial derivative example : (∂₀[ℝ] fun (x : ℝ × ℝ) => x.1) 0 = 1 := by simp [Pi.zero_def, lineDeriv] ``` This has already been discussed on Zulip [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Partial.20derivatives). I've opened this PR as a draft in order to get preliminary feedback on the contents (e.g. is this appropriate for Mathlib?); the file contains some demos of the notation in action. Co-authored-by: Eric Wieser --- - [ ] depends on: #25425 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict blocked-by-other-PR	195/0	Mathlib.lean,Mathlib/Analysis/Calculus/PartialDerivatives/Notation.lean,Mathlib/LinearAlgebra/Basis/HasCanonicalBasis.lean	3	16	['Paul-Lez', 'github-actions', 'leanprover-community-bot-assistant', 'lecopivo', 'mathlib4-dependent-issues-bot', 'ocfnash']	nobody	60-58911 1 month ago	60-58911 1 month ago	0-0 0 seconds
25143	chrisflav author:chrisflav	feat(RingTheory): smooth algebras have smooth Noetherian models	Co-authored by: Judith Ludwig --- - [ ] depends on: #24794 - [ ] depends on: #25138 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict blocked-by-other-PR	596/45	Mathlib.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/RingTheory/AlgebraicIndependent/Transcendental.lean,Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/Kaehler.lean,Mathlib/RingTheory/Smooth/NoetherianDescent.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/RingTheory/Unramified/Basic.lean	21	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	59-61104 1 month ago	59-61104 1 month ago	0-713 11 minutes
22909	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/Pure): pure submodules	A submodule `N` of an `R`-module is pure if all maps `S ⊗[R] N → S ⊗[R] M` deduced by base change from the injection of `N` into `M` are injective, for all `R`-algebras `S`. This is expressed by the class `Submodule.IsPure`. For type theoretic reason, the definition of `Submodule.IsPure` only considers algebras `S` in the same universe as `R`, but `Submodule.IsPure.baseChange_injective` establishes the property for all universes. * `Submodule.IsComplemented.isPure` : a complemented submodule is pure. Co-authored with @mariainesdff --- - [ ] depends on: #22898 - [ ] depends on: #22908 - [x] depends on: #22911 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict blocked-by-other-PR	592/3	Mathlib.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Cardinality.lean,Mathlib/RingTheory/Finiteness/Small.lean,Mathlib/RingTheory/Pure.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/FG.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/Small.lean	11	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	59-61038 1 month ago	59-61038 1 month ago	0-1047 17 minutes
22908	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/Finiteness/Small): tensor product of the system of small submodules	The directed limit of a tensor product for the directed system of small submodules. Co-authored with @mariainesdff --- - [ ] depends on: #22898 - [x] depends on: #22911 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict blocked-by-other-PR	624/2	Mathlib.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Cardinality.lean,Mathlib/RingTheory/Finiteness/Small.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/FG.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/Small.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	59-60990 1 month ago	59-60990 1 month ago	0-3552 59 minutes
26377	Whysoserioushah author:Whysoserioushah	feat(Mathlib/RingTheory/SimpleRing/TensorProduct): Tensor product of a simple algebra and a central simple algebra is simple	co-authored-by: @jjaassoonn --- - [ ] depends on: #26368 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict blocked-by-other-PR	423/0	Mathlib.lean,Mathlib/RingTheory/SimpleRing/TensorProduct.lean,Mathlib/RingTheory/TwoSidedIdeal/SpanAsSum.lean	3	15	['Whysoserioushah', 'eric-wieser', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	59-48393 1 month ago	59-48394 1 month ago	0-2337 38 minutes
14089	callesonne author:callesonne	feat(Bicategory/Functorbicategory): define bicategory of pseudofunctors	This PR contains a definition of the bicategory of pseudofunctors, in the file `Bicategory/FunctorBicategory/Pseudo.lean`. It also moves the file `Bicategory/Functorbicategory.lean` to `Bicategory/FunctorBicategory/Oplax.lean`. --- - [x] depends on: #14028 - [x] depends on: #18250 - [x] depends on: #18252 - [x] depends on: #18253 - [ ] depends on: #18254 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR	385/70	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Oplax.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Modification/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean	7	6	['callesonne', 'github-actions', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	nobody	59-6886 1 month ago	59-6887 1 month ago	9-2320 9 days
25825	yuma-mizuno author:yuma-mizuno	feat(CategoryTheory/Bicategory): define lax transformations between oplax functors	and also define oplax transformations between lax functors. - [ ] depends on: #25779 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #25672. Original PR: https://github.com/leanprover-community/mathlib4/pull/25672	large-import t-category-theory blocked-by-other-PR	431/10	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Lax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,scripts/noshake.json	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	57-59334 1 month ago	57-59353 1 month ago	0-1 1 second
28152	Sebi-Kumar author:Sebi-Kumar	feat(AlgebraicTopology): characterize simply connectedness in terms of loops	Show that a space is simply connected if and only if all loops within that space are homotopic to the constant loop. To be used in a proof that the `n`-sphere is simply connected for `n > 1`. --- This code was written at the University of Western Ontario as a part of the Fields Undergraduate Summer Research Program under the supervision of Chris Kapulkin and Daniel Carranza. - [ ] depends on: #28126 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor blocked-by-other-PR	37/5	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	55-39067 1 month ago	55-39068 1 month ago	0-2854 47 minutes
28208	Sebi-Kumar author:Sebi-Kumar	feat(Topology): add the definition `foldTrans` to concatenate finite sequences of paths	Add `foldTrans`, which folds the function `Path.trans` across a sequence of paths with compatible endpoints, corresponding to the concatenation of a finite sequence of paths. This is implemented with `Fin.dfoldl` from the Batteries library. Prove basic properties about `foldTrans` (i.e., how it behaves with respect to `Path.refl`, `Path.subpath`, and homotopies). --- 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 prove that the `n`-sphere is simply connected for `n > 1`, following the proof from Hatcher's "Algebraic Topology." - [ ] depends on: #27261 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology blocked-by-other-PR	259/0	Mathlib.lean,Mathlib/Topology/FoldTrans.lean,Mathlib/Topology/Subpath.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	54-8707 1 month ago	54-8708 1 month ago	0-2340 39 minutes
27100	staroperator author:staroperator	feat(ModelTheory): Presburger definability and semilinear sets	This PR defines [semilinear sets](https://en.wikipedia.org/wiki/Semilinear_set) and formalizes their equivalence with Presburger definabilty. As an application of this result, we prove that the graph of multiplication is not Presburger definable in ℕ. --- - [x] depends on: #26896 - [x] depends on: #27081 - [x] depends on: #27087 - [ ] depends on: #27789 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict blocked-by-other-PR	1667/7	Mathlib.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Module/Submodule/Defs.lean,Mathlib/GroupTheory/Finiteness.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Definability.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Basic.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Defs.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Nat.lean,Mathlib/Order/WellFoundedSet.lean,Mathlib/RingTheory/Finiteness/Cardinality.lean,docs/references.bib	12	6	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	53-51901 1 month ago	53-51902 1 month ago	0-1811 30 minutes
27626	EtienneC30 author:EtienneC30	chore: turn covarianceBilin into a ContinuousBilinForm	From BrownianMotion --- - [ ] depends on: #26315 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-measure-probability merge-conflict blocked-by-other-PR	275/2	Mathlib.lean,Mathlib/Analysis/NormedSpace/ContinuousBilinForm.lean,Mathlib/LinearAlgebra/BilinearForm/IsPosSemidef.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/Probability/Moments/CovarianceBilin.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	52-78779 1 month ago	52-78779 1 month ago	0-384 6 minutes
27645	bjornsolheim author:bjornsolheim	feat(Geometry/Convex/Cone): add pointed cone tensor products	Define the minimal and maximal tensor product of pointed cones. Prove that the minimal tensor product is less than or equal to the maximal tensor product. --- - [ ] depends on: #25292 - [ ] depends on: #27578 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry new-contributor blocked-by-other-PR	316/0	Mathlib.lean,Mathlib/Geometry/Convex/Cone/ConicalHull.lean,Mathlib/Geometry/Convex/Cone/TensorProduct.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	52-23250 1 month ago	52-26899 1 month ago	0-1828 30 minutes
28328	pechersky author:pechersky	chore(Topology/Valued): golf using local finite order of WithZeroTopology	have to juggle in a version of `mrangeRestrict` which works on valuations, and also juggle the scoped topology over the subtype topology --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #28325	large-import t-algebra t-topology t-number-theory blocked-by-other-PR label:t-algebra$	187/88	Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean,Mathlib/Topology/Compactness/Compact.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	51-72914 1 month ago	51-72915 1 month ago	0-1600 26 minutes
23915	joelriou author:joelriou	feat(CategoryTheory): deriving functors using a right derivability structure	We develop the API for derived functors following the existence theorem obtained in #26374. If `Φ` is a localizer morphism, we introduce a predicate `Φ.Derives F` for a functor `F` saying that `Φ.functor ⋙ F` inverts the given class of morphisms, and in case `Φ` is a right derivability structure, we show that `F` admits a right derived functor, and we obtain a recognition lemma for this derived functor. (In the future, this will be applied to the injective/projective/flat derivability structures.) --- - [ ] depends on: #26374 - [ ] depends on: #22474 - [ ] depends on: #26036 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR WIP	599/10	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/PointwiseRightDerived.lean,Mathlib/CategoryTheory/Functor/Derived/RightDerived.lean,Mathlib/CategoryTheory/Functor/KanExtension/Pointwise.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/Basic.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/Derives.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/PointwiseRightDerived.lean	12	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	51-52208 1 month ago	145-20732 4 months ago	0-0 0 seconds
27897	grunweg author:grunweg	feat: check indentation of doc-strings	Likely will require further adaptations to mathlib. May land piece-wise. But at first, let's see how big the overall fallout actually is. (So far: 100 lines of implementation and tests, and 170 lines of fix-ups; which are probably mostly complete, but not entirely.) --- - [ ] depends on: #27898 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter awaiting-CI merge-conflict blocked-by-other-PR	339/20	Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/Inductions.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/Enriched/Opposite.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean,Mathlib/CategoryTheory/NatIso.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/List/EditDistance/Defs.lean,Mathlib/Data/PNat/Xgcd.lean,Mathlib/Data/Part.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Filter/Partial.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/RingTheory/DividedPowers/Basic.lean,Mathlib/Tactic/ComputeDegree.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Tactic/Linter/DocString.lean,Mathlib/Tactic/MinImports.lean,Mathlib/Tactic/MoveAdd.lean,Mathlib/Tactic/RewriteSearch.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,MathlibTest/DocString.lean,MathlibTest/slow_simp.lean	37	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	50-73296 1 month ago	50-73297 1 month ago	0-1 1 second
27996	grunweg author:grunweg	feat: check indentation in doc-strings, medium version	--- - [ ] depends on: #27898 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR WIP	816/505	Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Finite.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Module/LinearMap/Polynomial.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/Inductions.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/CategoryTheory/Abelian/Basic.lean,Mathlib/CategoryTheory/Adjunction/AdjointFunctorTheorems.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Comma/Arrow.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/Enriched/Opposite.lean,Mathlib/CategoryTheory/EpiMono.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Generator/Basic.lean,Mathlib/CategoryTheory/Limits/ConeCategory.lean,Mathlib/CategoryTheory/Limits/Filtered.lean,Mathlib/CategoryTheory/Limits/FullSubcategory.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Over.lean,Mathlib/CategoryTheory/Limits/Shapes/IsTerminal.lean,Mathlib/CategoryTheory/Limits/Shapes/WideEqualizers.lean,Mathlib/CategoryTheory/Limits/Types/Yoneda.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean,Mathlib/CategoryTheory/NatIso.lean,Mathlib/CategoryTheory/ObjectProperty/FullSubcategory.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/CategoryTheory/Sites/Sheaf.lean,Mathlib/CategoryTheory/Sites/Sieves.lean,Mathlib/CategoryTheory/Subobject/Comma.lean,Mathlib/CategoryTheory/Thin.lean,Mathlib/CategoryTheory/Yoneda.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/Quiver/Symmetric.lean,Mathlib/Condensed/Equivalence.lean,Mathlib/Data/Bracket.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Finset/NatAntidiagonal.lean,Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/EditDistance/Defs.lean,Mathlib/Data/List/Rotate.lean,Mathlib/Data/Matrix/Composition.lean,Mathlib/Data/Multiset/Antidiagonal.lean,Mathlib/Data/Multiset/NatAntidiagonal.lean,Mathlib/Data/Num/Basic.lean,Mathlib/Data/Num/Bitwise.lean,Mathlib/Data/Ordmap/Ordnode.lean,Mathlib/Data/PNat/Xgcd.lean,Mathlib/Data/Part.lean,Mathlib/Data/Vector/Basic.lean,Mathlib/Data/Vector/Defs.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace/Gluing.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/LinearAlgebra/Finsupp/LinearCombination.lean,Mathlib/LinearAlgebra/InvariantBasisNumber.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Group/Action.lean,Mathlib/NumberTheory/FLT/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Filter/Partial.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/RingTheory/DividedPowers/Basic.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Prod.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Localization/Defs.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Ordinal/Family.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/Tactic/Algebraize.lean,Mathlib/Tactic/Bound/Attribute.lean,Mathlib/Tactic/ComputeDegree.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Tactic/Linter/DocString.lean,Mathlib/Tactic/MinImports.lean,Mathlib/Tactic/MoveAdd.lean,Mathlib/Tactic/RewriteSearch.lean	107	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	50-73171 1 month ago	50-73172 1 month ago	0-1 1 second
7873	astrainfinita author:astrainfinita	perf: reorder `extends` and change instance priority in algebra hierarchy	There are no strict rules, but in general `Cancel` is dropped first, then `Comm`, then `Neg / Inv`, then `Assoc`. Not sure if there's a better way. --- - [ ] depends on: #14712 - [x] depends on: #16638 - [ ] depends on: #18464 - [ ] depends on: #18468 - [ ] depends on: #18470 - [ ] depends on: #18472 - [ ] depends on: #18474 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	494/204	Archive/Imo/Imo1998Q2.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Associated.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/EuclideanDomain/Field.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Prod.lean,Mathlib/Algebra/GroupWithZero/Semiconj.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Homology/HomotopyCategory/DegreewiseSplit.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShiftSequence.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Field/Canonical/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/Rat.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/NormedSpace/Star/Multiplier.lean,Mathlib/CategoryTheory/Preadditive/FunctorCategory.lean,Mathlib/CategoryTheory/Preadditive/SingleObj.lean,Mathlib/CategoryTheory/Triangulated/Functor.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/Rat/Denumerable.lean,Mathlib/Data/Real/ENatENNReal.lean,Mathlib/Dynamics/Ergodic/AddCircle.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/Init/ZeroOne.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/External.lean,Mathlib/MeasureTheory/Decomposition/Jordan.lean,Mathlib/MeasureTheory/Decomposition/SignedLebesgue.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/LegendreSymbol/GaussEisensteinLemmas.lean,Mathlib/NumberTheory/RamificationInertia.lean,Mathlib/NumberTheory/WellApproximable.lean,Mathlib/NumberTheory/Zsqrtd/QuadraticReciprocity.lean,Mathlib/Order/Filter/Germ.lean,Mathlib/Order/Interval/Finset/Box.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Henselian.lean,Mathlib/RingTheory/Ideal/IsPrincipal.lean,Mathlib/RingTheory/Ideal/LocalRing.lean,Mathlib/RingTheory/Ideal/Norm.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/MvPolynomial/Symmetric.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/RingTheory/UniqueFactorizationDomain.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Tactic/Positivity/Core.lean	104	84	['MichaelStollBayreuth', 'astrainfinita', 'github-actions', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball']	nobody	49-34751 1 month ago	445-6304 1 year ago	7-77799 7 days
28530	nonisomorphiclinearmap author:nonisomorphiclinearmap	feat(Combinatorics/SimplicialComplex/Topology): add standard simplices and geometric realisation (colimit + functoriality)	Introduce the standard simplex on a finite vertex set and build the geometric realisation \|X\| of a simplicial complex. Prove that \|X\| is the colimit of the face diagram δ_X : X.faces ⥤ TopCat, and define the induced map on realisations \|φ\| : \|X\| ⟶ \|Y\| for a simplicial map φ. Show that the abstract map from colimit functoriality agrees with the concrete push-forward of barycentric coordinates. Package these into a functor SimplicialComplexCat ⥤ TopCat. --- 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 lays the groundwork to do this. 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. I would also like to thank our group members Sebastian Kumar, Tom Lindquist and Quang Minh Nguyen for our fruitful discussions. - [ ] depends on: #28125	new-contributor t-combinatorics blocked-by-other-PR	1826/0	Mathlib.lean,Mathlib/Combinatorics/SimplicialComplex/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Category.lean,Mathlib/Combinatorics/SimplicialComplex/FacePoset.lean,Mathlib/Combinatorics/SimplicialComplex/Hom.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Colimit.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Diagram.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Functor.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Map.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/Simplex.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/SimplexMap.lean	12	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	48-14511 1 month ago	48-21088 1 month ago	0-591 9 minutes
27557	chrisflav author:chrisflav	feat(RingTheory/KrullDimension): dimension of `R / (x)` for a nonzerodivisor	We show that if `R` is Noetherian and `x` is a nonzerodivisor contained in the Jacobson radical of `R`, then `dim R / (x) + 1 = dim R`. --- - [ ] depends on: #27538 - [ ] depends on: #27510 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import merge-conflict blocked-by-other-PR	509/1	Mathlib/Algebra/Module/SpanRank.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/RingTheory/Ideal/GoingDown.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Basic.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/KrullDimension/NonZeroDivisors.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/Localization/AtPrime.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean	17	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	46-54228 1 month ago	60-32361 1 month ago	0-562 9 minutes
27542	chrisflav author:chrisflav	feat(RingTheory/KrullDimension): dimension of polynomial ring	We show that for a Noetherian ring `R`, `dim R[X] = dim R + 1`. Co-authored by: Sihan Su Co-authored by: Yi Song --- - [ ] depends on: #27520 - [ ] depends on: #27538 - [ ] depends on: #27510 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import merge-conflict blocked-by-other-PR	474/3	Mathlib/Algebra/Module/SpanRank.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/RingTheory/Ideal/GoingDown.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Basic.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/KrullDimension/Polynomial.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean	17	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	46-54227 1 month ago	unknown	unknown
28502	gilesgshaw author:gilesgshaw	feat(Logic/Basic): avoid unnecessary uses of choice	Certain proofs are modified to remove a dependence on the axoim of choice --- - [ ] depends on: #28623	new-contributor t-logic merge-conflict awaiting-author blocked-by-other-PR	83/74	Mathlib/Logic/Basic.lean	1	7	['Ruben-VandeVelde', 'eric-wieser', 'gilesgshaw', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	45-75954 1 month ago	45-75955 1 month ago	0-35689 9 hours
27198	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): the Yoneda embedding is monoidal (for Day convolution)	We show that the Yoneda embedding is monoidal when we interpret its target category as Day presheaves (i.e presheaves with the Day convolution monoidal structure). The actual way we prove it is by registering a `LawfulDayConvolutionMonoidalCategoryStruct Cᵒᵖ (Type v₁) C`, for which the "interpretation" functor `C ⥤ Cᵒᵖ ⥤ Type v₁` is the Yoneda embedding. This allows to state a result independently of any size constraint on `C`. Then, we specialize to the case of a small category `C`, in this case, using the fact that the relevant colimit of preseaves exist, we use the fact that the interpretation functor induces a monoidal functor to put a `Monoidal` instance on the functor `dayYoneda : C ⥤ (Cᵒᵖ ⊛⥤ Type v₁) := yoneda ⋙ (equiv Cᵒᵖ _).inverse`. --- I was unsure about which form of simp lemmas we want for characterization of the monoidal structure on `dayYoneda`. I opted for making the "fully applied" lemmas simp, but still leaves the "unapplied" ones as non-simp just in case. - [ ] depends on: #27175 - [ ] depends on: #25732 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-category-theory merge-conflict blocked-by-other-PR	1847/26	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Types.lean,Mathlib/CategoryTheory/Monoidal/Internal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Limits/Basic.lean,Mathlib/CategoryTheory/Monoidal/Limits/Preserves.lean	8	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	44-74487 1 month ago	44-74487 1 month ago	0-21 21 seconds
23831	vasnesterov author:vasnesterov	feat(Analysis): binomial series convergence	Prove * `one_add_cpow_hasFPowerSeriesOnBall_zero`: for complex `a` and `\|x\| < 1`, the binomial series converges to `(1 + x).cpow a`. * `one_add_rpow_hasFPowerSeriesOnBall_zero`: the variant of the above for reals. --- - [x] depends on: #27537 - [ ] depends on: #26267 - [x] depends on: #26268 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict blocked-by-other-PR	606/6	Mathlib.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/Binomial.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Defs.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/NormedSpace/Connected.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/RingTheory/Binomial.lean,scripts/noshake.json	12	2	['leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	44-60451 1 month ago	178-42269 5 months ago	0-822 13 minutes
26719	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/PolynomialLaw/Basic): extends polynomial laws to arbitrary universes	The definition of polynomial laws restricts its operations to a fixed universe. This PR constructs the extension to any universe. This is part of the project of studying divided powers on rings, in particular, for studying the universal divided power algebra of a module. Co-authored-by: María-Inés de Frutos Fernández @mariainesdff --- - [x] depends on: #26717 - [ ] depends on: #26277 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import blocked-by-other-PR	969/7	Mathlib.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Congruence/Defs.lean,Mathlib/RingTheory/Congruence/Hom.lean,Mathlib/RingTheory/PolynomialLaw/Basic.lean	8	4	['acmepjz', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	44-57757 1 month ago	59-61407 1 month ago	0-1757 29 minutes
28499	yoh-tanimoto author:yoh-tanimoto	feat(MeasureTheory/VectorMeasure): add integral of a vector-valued function against a vector measure	add `VectorMeasureWithPairing.integral` for normed vector spaces `E`, `F`, a Banach space `G` , a continuous linear pairing `B : E →L[ℝ] F →L[ℝ] → G` and an `F`-valued vector measure `μ`, which should be informally written as `∫ B (f x) ∂μ x`. motivation: there are natural vector measures such as signed measures and complex measures, and their integrals appear naturally e.g. in a proof of the spectral theorem for general bounded normal operators on a Hilbert space. - [ ] depends on: #26160 for the definition and lemmas about the total variation of a vector measure.	t-measure-probability blocked-by-other-PR	651/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Integral.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	44-49468 1 month ago	49-10285 1 month ago	0-3692 1 hour
18805	astrainfinita author:astrainfinita	refactor: deprecate `SemilinearMapClass`	--- I'm not sure if we want to do this, but let's see if we can get a speed up from it first. - [ ] depends on: #18755 - [ ] depends on: #18756 - [ ] depends on: #18806 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench t-algebra merge-conflict blocked-by-other-PR WIP label:t-algebra$	546/318	Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/Rat.lean,Mathlib/Algebra/BigOperators/Balance.lean,Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/Rat.lean,Mathlib/Algebra/Module/LocalizedModule/Int.lean,Mathlib/Algebra/Module/Submodule/EqLocus.lean,Mathlib/Algebra/Module/Submodule/Equiv.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Ring/Divisibility/Basic.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/CategoryTheory/Limits/ConcreteCategory/WithAlgebraicStructures.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/Data/Complex/BigOperators.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Flat/Basic.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/Ideal/Norm.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/Polynomial/Opposites.lean,Mathlib/RingTheory/RootsOfUnity/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,Mathlib/Topology/Algebra/MulAction.lean,Mathlib/Topology/Homeomorph.lean,Mathlib/Topology/MetricSpace/Isometry.lean,scripts/no_lints_prime_decls.txt	55	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	43-41389 1 month ago	324-46058 10 months ago	0-0 0 seconds
25797	dagurtomas author:dagurtomas	feat(Condensed): closed symmetric monoidal structure on light condensed modules	--- - [ ] depends on: #25794 - [x] depends on: #24490 - [x] depends on: #24522 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24523. Original PR: https://github.com/leanprover-community/mathlib4/pull/24523	t-condensed merge-conflict blocked-by-other-PR WIP	906/427	Mathlib.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal/Basic.lean,Mathlib/CategoryTheory/Localization/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Braided/Transport.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean,Mathlib/Condensed/Light/Monoidal.lean,Mathlib/Condensed/Light/Small.lean	9	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	43-33687 1 month ago	43-33688 1 month ago	0-3 3 seconds
19582	yu-yama author:yu-yama	feat(GroupExtension/Abelian): define `OfMulDistribMulAction.equivH2`	Mainly defines: - `structure GroupExtension.OfMulDistribMulAction N G [MulDistribMulAction G N]`: group extensions of `G` by `N` where the multiplicative action of `G` on `N` is the conjugation - `structure GroupExtension.OfMulDistribMulActionWithSection N G [MulDistribMulAction G N]`: group extensions with specific choices of sections - `def GroupExtension.OfMulDistribMulAction.equivH2`: a bijection between the equivalence classes of group extensions and $H^2 (G, N)$ --- - [x] depends on: #20802 (split PR: contains changes to the `Defs` file) - [x] depends on: #20998 (split PR: mainly adds the `Basic` file) - [ ] depends on: #26670 (split PR: adds the first part of the `Abelian` file) Here is a relevant TODO in Mathlib: https://github.com/leanprover-community/mathlib4/blob/4e9fa40d7c480937e09cd6e47a591bd6f3b8be42/Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean#L46-L48 I would appreciate your comments. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	750/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Abelian.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,docs/references.bib	4	5	['YaelDillies', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	43-26062 1 month ago	43-26063 1 month ago	43-26015 43 days
28246	Sebi-Kumar author:Sebi-Kumar	feat(AlgebraicTopology/FundamentalGroupoid): the n-sphere is simply connected for n > 1	Prove that the `n`-dimensional sphere (i.e., the unit sphere centered at the origin in `(n + 1)`-dimensional real Euclidean space) is a simply connected space for `n > 1`. This proof follows Hatcher's "Algebraic Topology"; we first prove a general lemma about decomposing loops and then exploit the fact that non-surjective loops in the sphere are homotopically trivial. Note: To get this file to build, I edited `Mathlib/Tactic/Linter/DirectoryDependency.lean` to remove the restrictions on AlgebraicTopology files importing Geometry, NumberTheory, and SetTheory files. Thank you to those who shared their expertise [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Warning.20that.20AlgebraicTopology.20can't.20import.20SetTheory/with/533833638). As I understand it, this is just a short-term solution, so I would appreciate feedback on what to do about this situation. Note: I am unsure where exactly the file `SimplyConnectedSphere.lean` should go or whether that is an appropriate name for the file, so feedback there would be appreciated. --- To provide additional context, this code was written 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. - [ ] depends on: #28208 - [ ] depends on: #28198 - [ ] depends on: #28185 - [ ] depends on: #28152 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor blocked-by-other-PR	639/6	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnectedSphere.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Topology/FoldTrans.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/Subpath.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	42-24670 1 month ago	53-21868 1 month ago	0-23 23 seconds
25488	VTrelat author:VTrelat	feat(SetTheory/ZFC/Rationals): define rationals in ZFC	Extend the model of ZFC with rationals: we define a proper type `ZFRat` representing integers based on pairs of `ZFInt` (enforcing the res to be nonzero) and following the usual construction of rationals. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483 - [ ] depends on: #25485 - [ ] depends on: #25486	t-set-theory new-contributor merge-conflict blocked-by-other-PR	2070/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Integers.lean,Mathlib/SetTheory/ZFC/Rationals.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	41-77080 1 month ago	41-77080 1 month ago	0-1808 30 minutes
23966	astrainfinita author:astrainfinita	refactor: unbundle algebra from `{Seminormed, Normed}(Add)(Comm)Group`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #23621 - [ ] depends on: #23961	slow-typeclass-synthesis t-algebra t-analysis merge-conflict blocked-by-other-PR label:t-algebra$	3233/2752	Archive/Imo/Imo1998Q2.lean,Counterexamples/LinearOrderWithPosMulPosEqZero.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/CPolynomialDef.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Analytic/Linear.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Analytic/Polynomial.lean,Mathlib/Analysis/Analytic/RadiusLiminf.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Analytic/Within.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/BoxIntegral/Integrability.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Measure.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousLinearMap.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Defs.lean,Mathlib/Analysis/Calculus/AddTorsor/AffineMap.lean,Mathlib/Analysis/Calculus/AddTorsor/Coord.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/BumpFunction/Convolution.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/BumpFunction/InnerProduct.lean,Mathlib/Analysis/Calculus/BumpFunction/Normed.lean,Mathlib/Analysis/Calculus/Conformal/InnerProduct.lean,Mathlib/Analysis/Calculus/Conformal/NormedSpace.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/CPolynomial.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/ContDiff/FiniteDimension.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Analysis/Calculus/ContDiff/WithLp.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/Abs.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/AffineMap.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Comp.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Calculus/Deriv/Linear.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/Deriv/Prod.lean,Mathlib/Analysis/Calculus/Deriv/Shift.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/Deriv/Star.lean,Mathlib/Analysis/Calculus/Deriv/Support.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/DiffContOnCl.lean,Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Bilinear.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/FDeriv/Extend.lean,Mathlib/Analysis/Calculus/FDeriv/Linear.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Norm.lean,Mathlib/Analysis/Calculus/FDeriv/Pi.lean,Mathlib/Analysis/Calculus/FDeriv/Prod.lean,Mathlib/Analysis/Calculus/FDeriv/RestrictScalars.lean,Mathlib/Analysis/Calculus/FDeriv/Star.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/FDeriv/WithLp.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean	579	7	['astrainfinita', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	41-52264 1 month ago	174-74214 5 months ago *	0-0 0 seconds *
22771	alreadydone author:alreadydone	feat(Homotopy/Lifting): monodromy of covering maps and lifting criterion	Define the monodromy of a covering map: given a path in the base space, lifting it through the covering map induces a bijection between the fibers at the two endpoints of the path. Definition 2.1 in https://ncatlab.org/nlab/show/monodromy. --- - [ ] depends on: #28234 - [x] depends on: #22649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology blocked-by-other-PR	193/146	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Homotopy/Product.lean	9	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	PatrickMassot assignee:PatrickMassot	41-48049 1 month ago	41-54571 1 month ago	144-35711 144 days
28787	alreadydone author:alreadydone	feat(Counterexamples): a domain whose ring of differences is not a domain	Example produced by Gemini 2.5 Pro: https://gemini.google.com/share/9558539e1309 --- - [ ] depends on: #28468 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	1200/204	Counterexamples.lean,Counterexamples/GrothendieckAddGroupIsDomain.lean,Mathlib.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/Algebra/Order/Nonneg/Basic.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Ring/Invertible.lean,Mathlib/GroupTheory/MonoidLocalization/Archimedean.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/Lemmas.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Localization/Additive.lean,Mathlib/RingTheory/Localization/Away/Basic.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean,Mathlib/RingTheory/Localization/Ideal.lean,Mathlib/RingTheory/Localization/StrongRankCondition.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean,Mathlib/RingTheory/Trace/Quotient.lean	23	6	['alreadydone', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	nobody	40-42086 1 month ago	40-42086 1 month ago	1-48447 1 day
28475	astrainfinita author:astrainfinita	chore(Analysis/SpecificLimits/Basic): generalize lemmas	--- - [ ] depends on: #28472 - [ ] depends on: #28474 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict blocked-by-other-PR	131/98	Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Analysis/SpecificLimits/RCLike.lean,Mathlib/Data/Real/Hyperreal.lean,Mathlib/Topology/Algebra/Order/Field.lean,Mathlib/Topology/Instances/Rat.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	38-45561 1 month ago	38-45562 1 month ago	0-2105 35 minutes
27578	bjornsolheim author:bjornsolheim	feat(Geometry/Convex/Cone): add conical combinations and conical hull	- Prove closure properties of sequences with nonnegative coefficients - Define conical hull - Prove that the smallest pointed cone containing s is the conical hull of s - Implemented with Finsupp --- - [ ] depends on: #25292 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry new-contributor blocked-by-other-PR	188/0	Mathlib.lean,Mathlib/Geometry/Convex/Cone/ConicalHull.lean	2	8	['YaelDillies', 'bjornsolheim', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	38-36235 1 month ago	52-31935 1 month ago	0-254 4 minutes
28596	CBirkbeck author:CBirkbeck	Dedekind eta e2	We show that the logarithmic derivative of the Dedekind eta function equals the the Eisenstein series E2 (up to a constant). --- - [ ] depends on: #27606 - [ ] depends on: #26014 - [x] depends on: #28400 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR	1236/22	Mathlib.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/LogDeriv.lean,Mathlib/Analysis/Calculus/LogDerivUniformlyOn.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/IntegerCompl.lean,Mathlib/Analysis/Complex/SummableUniformlyOn.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/LSeries/RiemannZeta.lean,Mathlib/NumberTheory/ModularForms/DedekindEta.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Defs.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Summable.lean,Mathlib/NumberTheory/TsumDivsorsAntidiagonal.lean,Mathlib/RingTheory/EuclideanDomain.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean	22	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	36-45775 1 month ago	unknown	unknown
28686	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): prove the Erdős-Stone theorem	Proves the Erdős-Stone theorem: If `G` has at least `(1 - 1 / r + o(1)) * card V ^ 2 / 2` many edges, then `G` contains a copy of a `completeEquipartiteGraph (r + 1) t`. --- - [ ] depends on: #28685 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict blocked-by-other-PR WIP	757/14	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Operations.lean,Mathlib/Data/Finset/Union.lean,Mathlib/Data/Nat/Cast/Order/Field.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	36-45649 1 month ago	36-45650 1 month ago	0-10 10 seconds
28687	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): prove the Erdős-Stone-Simonovits theorem	Proves the Erdős-Stone-Simonovits theorem: If the chromatic number of `H` equals `r + 1 > 0`, then the `extremalNumber` of `H` is greater than `(1 - 1 / r - o(1)) * card V ^ 2 / 2` and at most `(1 - 1 / r + o(1)) * card V ^ 2 / 2`. --- - [ ] depends on: #28686 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict blocked-by-other-PR WIP	879/14	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Operations.lean,Mathlib/Data/Finset/Union.lean,Mathlib/Data/Nat/Cast/Order/Field.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	36-45648 1 month ago	36-45649 1 month ago	0-74 1 minute
28689	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): prove well-known corollaries of the Erdős-Stone-Simonovits theorem	Proves well-known corollaries of the Erdős-Stone-Simonovits theorem: E.g., if the chromatic number of `H` equals `r + 1 > 1`, then `extremalNumber n H` is asymptotically equivalent to `(1 - 1 / r) * n.choose 2` as `n → ∞` --- - [ ] depends on: #28687 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict blocked-by-other-PR WIP	958/14	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Operations.lean,Mathlib/Data/Finset/Union.lean,Mathlib/Data/Nat/Cast/Order/Field.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	36-45647 1 month ago	36-45648 1 month ago	0-45 45 seconds
23460	Timeroot author:Timeroot	feat: Definition of `Clone`	Basics about Clones. Part of #20051 --- - [ ] depends on: #26329 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	326/0	Mathlib.lean,Mathlib/Algebra/Clone/Basic.lean,Mathlib/Algebra/Clone/Defs.lean,Mathlib/Data/Fin/Basic.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	dagurtomas assignee:dagurtomas	36-30625 1 month ago	36-30626 1 month ago	65-54988 65 days
29076	yury-harmonic author:yury-harmonic	feat(BigOperators/ModEq): new file	--- - [ ] depends on: #29072 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	319/15	Mathlib.lean,Mathlib/Algebra/BigOperators/ModEq.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Data/Nat/ModEq.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	36-24068 1 month ago	36-30906 1 month ago	0-726 12 minutes
26952	robin-carlier author:robin-carlier	feat(CategoryTheory/DayConvolution): monoid objects internal to day convolutions	In this file, given `F : C ⊛⥤ V`, we provide a bijective correspondence between lax monoidal structures on `F.functor` and `Mon_Class F` structures. We also prove that through this correspondance, monoidal natural transformations correspond to morphisms of internal monoid objects. --- - [ ] depends on: #26890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR	1574/19	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Mon_.lean	5	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	36-17858 1 month ago	36-17859 1 month ago	0-584 9 minutes
27133	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): `C ⊛⥤ V` is monoidal closed when `V` is	When `V` is a monoidal closed category admitting enough limits, we show that the type alias `C ⊛⥤ V` for functors `C ⥤ V` with Day convolution monoidal structure is monoidal closed using the API for `LawfulDayConvolutionClosedMonoidalCategoryStruct` developped in #27119. We expose the required data to exhibit (realization as a functor of) the internal hom as a suitable, and we port the lemmas that characterize its functoriality in that regard, as well as the evaluation and coevaluation morphisms. --- - [ ] depends on: #27119 - [ ] depends on: #26890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR	1706/20	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Closed.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean	5	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	36-17733 1 month ago	unknown	unknown
27151	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): `C ⊛⥤ V` is braided/symmetric when `C` and `V` are braided/symmetric	We use the machinery from #27150 to show that Day functors (the type alias for functors endowed with the Day convolution monoidal structure) are braided/symmetric when the base categories are. --- - [ ] depends on: #27150 - [ ] depends on: #26890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR	1591/20	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean	5	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	36-17731 1 month ago	unknown	unknown
27175	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): `LawfulDayConvolutionMonoidalCategoryStruct.ι C V D` is monoidal when the target is `C ⊛⥤ V`	We prove a "soundness" result for our notion of `LawfulDayConvolutionMonoidalCategoryStruct`, i.e that when be interpret its field `ι` as valued in Day functors (the type alias for functors endowed with the Day convolution monoidal structure), the data from `LawfulDayConvolutionMonoidalCategoryStruct` turn `ι` in a monoidal functor, proving that the categories endowed with such a structure are precisely those that can be identified to monoidal (not necessarily full) subcategories of Day functors. Implicitly, the structure isomorphisms for this monoidal structure bundle isomorphisms asserting unicity up to isomorphisms of day convolutions. --- - [ ] depends on: #26890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR	1585/24	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean	4	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	36-17730 1 month ago	unknown	unknown
28819	ScottCarnahan author:ScottCarnahan	feat (Data/Finsupp): define convolution smul for finsupps on formal functions	This is a generalization of the multiplication action of the ring of Laurent polynomials on the space of formal power series with unbounded pole terms. --- - [ ] depends on: #28876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	127/15	Mathlib.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Data/Finset/SMulAntidiagonal.lean,Mathlib/Data/Finsupp/PointwiseSMul.lean,Mathlib/Data/Set/SMulAntidiagonal.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	34-54933 1 month ago	34-60327 1 month ago	1-6093 1 day
28013	astrainfinita author:astrainfinita	feat: Lindemann-Weierstrass Theorem	This PR continues the work from #6718. -------- - [x] depends on: #18693 - [ ] depends on: #29121	t-algebra t-analysis merge-conflict blocked-by-other-PR WIP label:t-algebra$	1205/53	Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/NumberTheory/Transcendental/Lindemann/AlgebraicPart.lean,Mathlib/NumberTheory/Transcendental/Lindemann/AnalyticalPart.lean,Mathlib/NumberTheory/Transcendental/Lindemann/Basic.lean,Mathlib/NumberTheory/Transcendental/Lindemann/SumAEvalARoots.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/Eval.lean,docs/100.yaml,docs/1000.yaml	11	n/a	['astrainfinita', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	33-80925 1 month ago	unknown	unknown
26413	michaellee94 author:michaellee94	feat(Analysis/ODE/MaximalSolution): Existence of maximal solutions for ODE meeting Picard-Lindelöf conditions	Add existence proof for maximal solution of ODE using Picard-Lindelöf and a uniqueness theorem using Grönwall's lemma. --- - [x] depends on: #26382 - [ ] depends on: #29186 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict awaiting-author blocked-by-other-PR	746/1	Mathlib.lean,Mathlib/Analysis/ODE/MaximalSolution.lean,docs/undergrad.yaml	3	13	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'winstonyin']	nobody	33-22465 1 month ago	33-22466 1 month ago	0-5139 1 hour
29203	Hagb author:Hagb	(WIP) feat(RingTheory/MvPolynomial/Groebner) : Gröbner basis	WIP Co-authored-by: Hao Shen [3118181069@qq.com](mailto:3118181069@qq.com) --- CC @tsuki8 - [ ] depends on: #26039 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import blocked-by-other-PR	507/3	Mathlib/RingTheory/MvPolynomial/Groebner.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	32-62169 1 month ago	32-62170 1 month ago	0-0 0 seconds
28462	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): the relative cell complex attached to a rank function for a pairing	--- - [ ] depends on: #28351 - [ ] depends on: #28346 - [ ] depends on: #28336 - [ ] depends on: #28332 - [ ] depends on: #28330 - [ ] depends on: #28224 - [x] depends on: #27968 - [ ] depends on: #28034 - [ ] depends on: #26076 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology merge-conflict blocked-by-other-PR WIP	1442/5	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/IsUniquelyCodimOneFace.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Pairing.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/PairingCore.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Rank.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/RankNat.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/RelativeCellComplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplicesSubcomplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/Simplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/CategoryTheory/EpiMono.lean,docs/references.bib	15	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	32-61292 1 month ago	46-54165 1 month ago	0-1 1 second
28351	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): the rank function with values in natural numbers of a regular pairing	Given a regular pairing `P` for a subcomplex of a simplicial, following the work by Sean Moss, Another approach to the Kan-Quillen model structure, we show that the rank function relative to the well founded ancestrality relation has values in the type of natural numbers. --- - [ ] depends on: #28346 - [ ] depends on: #28336 - [ ] depends on: #28332 - [ ] depends on: #28330 - [ ] depends on: #28224 - [x] depends on: #27968 - [ ] depends on: #28034 - [ ] depends on: #26076 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology merge-conflict blocked-by-other-PR WIP	1316/5	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/IsUniquelyCodimOneFace.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Pairing.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/PairingCore.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Rank.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/RankNat.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplicesSubcomplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/Simplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/CategoryTheory/EpiMono.lean,docs/references.bib	14	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	32-61287 1 month ago	unknown	unknown
28346	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): rank functions for pairings	This PR introduces the type of (weak) rank functions for pairings, a notion introduced by Sean Moss, Another approach to the Kan-Quillen model structure. Rank functions can be used in order to show that certain pairings are regular (i.e. the ancestrality relation is well founded). In a future PR, it shall be shown that a regular pairing admits a rank function to the natural numbers, which shall be used to show that the corresponding inclusion of simplicial sets is a (strong) anodyne extension. --- - [ ] depends on: #28336 - [ ] depends on: #28332 - [ ] depends on: #28330 - [ ] depends on: #28224 - [x] depends on: #27968 - [ ] depends on: #28034 - [ ] depends on: #26076 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology merge-conflict blocked-by-other-PR WIP	1214/5	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/IsUniquelyCodimOneFace.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Pairing.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/PairingCore.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Rank.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplicesSubcomplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/Simplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/CategoryTheory/EpiMono.lean,docs/references.bib	13	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	32-61285 1 month ago	unknown	unknown
28336	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): a helper structure to construct pairings	In this PR, we introduce an helper structure `Subcomplex.PairingCore` in order to construct a pairing for a subcomplex of a simplicial set. The main differences with `Subcomplex.Pairing` are that we provide an index type `ι` in order to parametrize type (I) and type (II) simplices, and that the dimensions of these are definitionally `d` or `d + 1`. --- - [ ] depends on: #28332 - [ ] depends on: #28330 - [ ] depends on: #28224 - [x] depends on: #27968 - [ ] depends on: #28034 - [ ] depends on: #26076 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology merge-conflict blocked-by-other-PR WIP	1040/5	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/IsUniquelyCodimOneFace.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Pairing.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/PairingCore.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplicesSubcomplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/Simplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/CategoryTheory/EpiMono.lean,docs/references.bib	12	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	32-61284 1 month ago	46-54364 1 month ago	0-2 2 seconds
28332	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): pairings of non degenerate simplices, following Sean Moss	In this PR, we introduce the notion of pairing for a subcomplex of a simplicial set. Following the work of Sean Moss, Another approach to the Kan-Quillen model structure, this is an essential tool in the study of (inner) anodyne extensions. --- - [ ] depends on: #28330 - [ ] depends on: #28224 - [x] depends on: #27968 - [ ] depends on: #28034 - [ ] depends on: #26076 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology merge-conflict blocked-by-other-PR WIP	796/5	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/IsUniquelyCodimOneFace.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Pairing.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplicesSubcomplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/Simplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/CategoryTheory/EpiMono.lean,docs/references.bib	11	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	32-61283 1 month ago	46-54367 1 month ago	0-21 21 seconds
25741	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/SimplicialObject): definitions of simplicial objects by generators and relation	We leverage the equivalence between `SimplexCategory` and `SimplexCategoryGenRel` to give new constructors for (co)simplicial objects, as well as constructors for natural transformations (resp. isomorphism) between those. Final PR in the series of PR formalising the equivalence between `SimplexCategory` and `SimplexCategoryGenRel`. --- - [ ] depends on: #25740 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #21748. Original PR: https://github.com/leanprover-community/mathlib4/pull/21748	t-algebraic-topology large-import t-category-theory merge-conflict blocked-by-other-PR	1363/9	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Equivalence.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean,Mathlib/AlgebraicTopology/SimplicialObject/GeneratorsRelations.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	32-57925 1 month ago	32-57926 1 month ago	11-15676 11 days
25273	YaelDillies author:YaelDillies	refactor: make `MonoidAlgebra` into a one-field structure	From Toric --- - [x] depends on: #26732 - [x] depends on: #28407 - [x] depends on: #28460 - [ ] depends on: #28511 - [ ] depends on: #29207 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra blocked-by-other-PR WIP label:t-algebra$	547/588	Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean	6	36	['JovanGerb', 'YaelDillies', 'alreadydone', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	32-48793 1 month ago	33-50184 1 month ago	36-61320 36 days
27707	FLDutchmann author:FLDutchmann	feat(NumberTheory/SelbergSieve): define Selberg's weights and prove basic results.	This PR continues the work from #23635. Original PR: https://github.com/leanprover-community/mathlib4/pull/23635 - [ ] depends on: #27702	t-analysis t-number-theory merge-conflict blocked-by-other-PR	407/83	Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/SelbergSieve.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	32-24575 1 month ago	32-24576 1 month ago	3-375 3 days
27898	grunweg author:grunweg	feat: check indentation of doc-strings, basic version	Basic version of #27897 (which still has some false positives): let's land this before weeding out the other errors. --- - [x] depends on: #27895 - [x] depends on: #27901 - [ ] depends on: #27933 - a PR for adding clarifying newlines - some miscellaneous indentation changes [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict blocked-by-other-PR	510/268	Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Module/LinearMap/Polynomial.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/Inductions.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/Enriched/Opposite.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Limits/Basic.lean,Mathlib/CategoryTheory/NatIso.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Data/Bracket.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/EditDistance/Defs.lean,Mathlib/Data/List/Rotate.lean,Mathlib/Data/Num/Basic.lean,Mathlib/Data/Num/Bitwise.lean,Mathlib/Data/Ordmap/Ordnode.lean,Mathlib/Data/PNat/Xgcd.lean,Mathlib/Data/Part.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace/Gluing.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Group/Action.lean,Mathlib/NumberTheory/FLT/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Filter/Partial.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/RingTheory/DividedPowers/Basic.lean,Mathlib/Tactic/Bound/Attribute.lean,Mathlib/Tactic/ComputeDegree.lean,Mathlib/Tactic/Linter/DocString.lean,Mathlib/Tactic/MinImports.lean,Mathlib/Tactic/MoveAdd.lean,Mathlib/Tactic/RewriteSearch.lean,Mathlib/Tactic/Sat/FromLRAT.lean,Mathlib/Tactic/TermCongr.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,Mathlib/Util/Notation3.lean,Mathlib/Util/Superscript.lean,MathlibTest/DocString.lean,MathlibTest/slow_simp.lean	54	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	32-24574 1 month ago	32-24575 1 month ago	0-26 26 seconds
28126	Sebi-Kumar author:Sebi-Kumar	feat(AlgebraicTopology/FundamentalGroupoid): relate equality in fundamental groupoid to homotopy	Prove the theorem `fromPath_eq_iff_homotopic` which shows that two paths are equal in the fundamental groupoid if and only if they are homotopic. Also add simp lemmas `fromPath_refl`, `fromPath_symm`, and `fromPath_trans`. Together, these allow one to prove two paths are homotopic by transferring to the fundamental groupoid and using the `aesop_cat` tactic. --- I would like to thank Kenny Lau for inspiring this code on Zulip at [#Is there code for X? > Using aesop_cat to prove paths are homotopic](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Using.20aesop_cat.20to.20prove.20paths.20are.20homotopic). Also, I would like to note that I am a newcomer when it comes to contributing to Mathlib, and that this code was written as a part of a formalization project at the University of Western Ontario under the supervision of Chris Kapulkin and Daniel Carranza (which is happening through the Fields Undergraduate Summer Research Program). - [ ] depends on: #28234 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor awaiting-author blocked-by-other-PR	121/141	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Product.lean	8	10	['Sebi-Kumar', 'alreadydone', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mattrobball']	mattrobball assignee:mattrobball	31-27213 1 month ago	31-27213 1 month ago	14-30316 14 days
28017	eric-wieser author:eric-wieser	feat: generalize some opnorm lemmas to seminormed spaces	--- - [ ] depends on: #28014 - [ ] depends on: #28101 - [ ] depends on: #29120 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict blocked-by-other-PR WIP	60/24	Mathlib/Analysis/NormedSpace/OperatorNorm/NNNorm.lean,Mathlib/Analysis/NormedSpace/Real.lean	2	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	31-10057 1 month ago	31-10058 1 month ago	0-0 0 seconds
27675	EtienneC30 author:EtienneC30	feat: introduce `covInnerBilin`	`covInnerBilin` is the covariance bilinear form associated with a measure on an inner product space. from BrownianMotion --- - [ ] depends on: #27626 - [x] depends on: #27674 Co-authored-by: Rémy Degenne @RemyDegenne [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-measure-probability merge-conflict blocked-by-other-PR	695/2	Mathlib.lean,Mathlib/Analysis/NormedSpace/ContinuousBilinForm.lean,Mathlib/LinearAlgebra/BilinearForm/IsPosSemidef.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/MeasureTheory/Integral/Eval/Basic.lean,Mathlib/MeasureTheory/Integral/Eval/WithLp.lean,Mathlib/Probability/Moments/CovInnerBilin.lean,Mathlib/Probability/Moments/CovarianceBilin.lean	9	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	30-75801 1 month ago	52-78778 1 month ago	0-1309 21 minutes
25841	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): prove the Kővári–Sós–Turán theorem	Prove the Kővári–Sós–Turán theorem for simple graphs: The `(completeBipartiteGraph α β).Free` simple graphs for `card α ≤ card β` on the vertex type `V` have at most `(card β-1)^(1/(card α))(card V)^(2-1/(card α))/2 + (card V)(card α-1)/2` edges. The double-counting construction from the proof is available in `namespace KovariSosTuran`. --- - [x] depends on: #19865 - [x] depends on: #20738 - [ ] depends on: #27602 I've tried to make as much of the double-counting construction not private as possible. I figure it is useful to borrow constructions between proofs. If this is just considered garbage and bloat and better left private. Please let me know. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #20240. Original PR: https://github.com/leanprover-community/mathlib4/pull/20240	t-combinatorics blocked-by-other-PR WIP	283/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/KovariSosTuran.lean	3	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	30-40248 1 month ago	30-41656 1 month ago	45-15427 45 days
29357	eric-wieser author:eric-wieser	refactor: generalize IsSimpleRing to semirings	--- - [ ] depends on: #26277 - [ ] depends on: #22954 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	26/9	Mathlib/Data/Setoid/Basic.lean,Mathlib/RingTheory/SimpleRing/Basic.lean,Mathlib/RingTheory/SimpleRing/Defs.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	28-57767 28 days ago	28-57769 28 days ago	0-0 0 seconds
29393	staroperator author:staroperator	feat(SetTheory/ZFC): `card (V_ o) = preBeth o`	--- - [ ] depends on: #26544 - [ ] depends on: #29351 - [ ] depends on: #29365 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	231/41	Mathlib.lean,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,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Cardinal.lean,Mathlib/SetTheory/ZFC/VonNeumann.lean	14	4	['github-actions', 'mathlib4-dependent-issues-bot', 'staroperator', 'vihdzp']	nobody	26-48007 26 days ago	27-2826 27 days ago	0-0 0 seconds
28865	grunweg author:grunweg	feat: a map is smooth iff its post-composition with an immersion is	The continuous case is mostly solved --- except for one detail where I'm not even sure if this is true. Maybe!, I need to require continuity, at least in general. (Perhaps not for interior points... we'll see!) A future PR will use this to golf the results in `Icc/Instances.lean`. --- - [ ] depends on: #28793 - [ ] depends on: #28796 - [ ] depends on: #28853 (for simplicity) - [ ] depends on: #28905 history bifurcates here: merge that PR first, then rebase this one [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	1026/7	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Topology/PartialHomeomorph.lean,docs/references.bib,temp_.sh	12	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	25-18927 25 days ago	25-18928 25 days ago	0-11 11 seconds
28905	grunweg author:grunweg	feat: immersions are locally embeddings	Hopefully, this can be used for the topological portion of #28865. (That part is not certain yet, the rest works.) --- TODO: move two helper results about embeddings to their proper place; perhaps even PR separately - [ ] depends on: #28793 - [ ] depends on: #28796 - [ ] depends on: #28853 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	792/7	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Topology/PartialHomeomorph.lean,docs/references.bib,temp_.sh	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	25-18926 25 days ago	25-18927 25 days ago	0-617 10 minutes
29077	grunweg author:grunweg	feat(Manifold/Instances/Icc): golf smoothness proof using immersions	Prove that the inclusion of an interval into the real numbers is a smooth immersion, and use this to golf the proof that this inclusion is smooth. TODO: right now, the computation doesn't check out; I need to tweak the charts I have. But that is surely doable. A future PR will prove it is a smooth embedding. --- - [ ] depends on: #28865 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	1122/56	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/Instances/Icc.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Topology/PartialHomeomorph.lean,docs/references.bib,temp_.sh	13	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	25-18925 25 days ago	25-18925 25 days ago	0-309 5 minutes
25737	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms): Normal forms for `P_δ`s	We prove that admissible lists indeed provide a normal form for morphisms of satisfying `P_δ`. To this end, we introduce `standardδ`, a construction that takes a list and turn it into a composition of `δ i`s in `SimplexCategoryGenRel`. We then prove that, thanks to the first simplicial identity, composition on the left corresponds to simplicial insertion in the list. This gives existence of a normal form for every morphism satisfying `P_δ`. For unicity, we introduce an auxiliary function `simplicialEvalδ : (List ℕ) → ℕ → ℕ` and show that for admissible lists, it lifts to `ℕ` the `orderHom` attached to `toSimplexCategory.map standardδ`, and that we can recover elements of the list only by looking at values of this function. Part of a series of PR formalising that `SimplexCategoryGenRel` is equivalent to `SimplexCategory`. --- - [ ] depends on: #25736 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #21746. Original PR: https://github.com/leanprover-community/mathlib4/pull/21746	t-algebraic-topology large-import t-category-theory blocked-by-other-PR	380/9	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	24-64286 24 days ago	24-65292 24 days ago	0-2 2 seconds
28804	grunweg author:grunweg	feat: a few more tactic linters	All analysis passes in this list have been suggested [on zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Tactic.20analysis.20framework/with/535766713). --- Untested, so may not work yet. - [ ] depends on: #28802 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict blocked-by-other-PR	204/26	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/TacticAnalysis/Declarations.lean,Mathlib/Tactic/TacticAnalysis/FunProp.lean,Mathlib/Tactic/TacticAnalysis/Misc.lean,MathlibTest/TacticAnalysis2.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	23-64470 23 days ago	23-64471 23 days ago	0-705 11 minutes
28968	linesthatinterlace author:linesthatinterlace	refactor(Order/Hom/Basic): Replace `abbrev` with `def` in OrderEmbedding and OrderIso	--- - [ ] depends on: #28944 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	258/200	Mathlib/Data/Sum/Order.lean,Mathlib/Order/FixedPoints.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/Order.lean	4	5	['YaelDillies', 'github-actions', 'linesthatinterlace', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	b-mehta and linesthatinterlace assignee:b-mehta assignee:linesthatinterlace	23-35443 23 days ago	23-35444 23 days ago	0-0 0 seconds
29519	joelriou author:joelriou	feat(CategoryTheory): strong generators	In this PR, we introduce a condition `IsStrongGenerator S` on a set `S` of objects in a category `C` which is stronger than `IsSeparating S` as we also require that for any proper subobject `A ⊂ X`, there exists a morphism `G ⟶ X` from an object in `S` which does not factor through `A`. In case coproducts exists, we give a characterization of `IsStrongSeparator S` (resp. `IsSeparating S`) in terms of the existence, for each object `X : C` of an extremal epi (resp. epi) to `X` from a coproduct of objects in `S`. In future works, this shall be used in order to characterize locally `κ`-presentable categories as cocomplete categories that have a strong generator consisting of `κ`-presentable objects. --- - [ ] depends on: #29518 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	281/0	Mathlib.lean,Mathlib/CategoryTheory/ExtremalEpi.lean,Mathlib/CategoryTheory/Generator/StrongGenerator.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	22-66494 22 days ago	23-8846 23 days ago	0-2 2 seconds
29543	joelriou author:joelriou	feat(CategoryTheory): a set S of objects is a strong generator if any object is a colimit of objects in S	--- - [ ] depends on: #29519 - [ ] depends on: #29518 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR	337/2	Mathlib.lean,Mathlib/CategoryTheory/ExtremalEpi.lean,Mathlib/CategoryTheory/Generator/StrongGenerator.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	22-64909 22 days ago	22-64910 22 days ago	0-1700 28 minutes
29204	ShreckYe author:ShreckYe	feat(GroupTheory/OrderOfElement): `Pi.orderOf_eq` and its related and depended-upon theorems related to `Pi`, `minimalPeriod`, and `IsPeriodicPt`	The need for `Pi.orderOf_eq` comes in helping prove the value of the order of a `ZMod` number when used with `ZMod.prodEquivPi`. At first I was only trying to prove `(a : (i : Fin n) → α i) : orderOf a = Finset.univ.lcm (fun i => orderOf (a i))`, but after seeing the "Corresponding `pi` lemmas" comment, I realized that this could be generalized to Pi-types (`Pi`) and also some related and dependent theorems are not implemented yet, so I went on to add and prove these referring to those similar ones for product types (`Prod`). --- - [ ] depends on: #29530	t-group-theory large-import t-dynamics merge-conflict blocked-by-other-PR	153/10	Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Logic/Function/Iterate.lean	5	7	['ShreckYe', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	22-32165 22 days ago	22-32166 22 days ago	9-60153 9 days
29565	joelriou author:joelriou	feat(CategoryTheory): dense functors	A functor `F : C ⥤ D` is dense if any `Y : D` is a canonical colimit relatively to `F`. When `F` is full, we show that this is equivalent to saying that the restricted Yoneda functor `D ⥤ Cᵒᵖ ⥤ Type _` is fully faithful. We also show that the range of a dense functor is a strong generator. --- - [ ] depends on: #29556 - [ ] depends on: #29519 - [ ] depends on: #29518 - [ ] depends on: #29543 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	531/2	Mathlib.lean,Mathlib/CategoryTheory/ExtremalEpi.lean,Mathlib/CategoryTheory/Functor/Dense.lean,Mathlib/CategoryTheory/Generator/StrongGenerator.lean,Mathlib/CategoryTheory/Limits/Canonical.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	22-18520 22 days ago	22-18527 22 days ago	0-1 1 second
29243	yoh-tanimoto author:yoh-tanimoto	feat(Analysis/InnerProductSpace/Projection/Submodule): add `sup_orthogonal` for `ClosedSubmodules`	prove that the closed submodule generated by the orthogonal complements of two submodules is the orthogonal complement of the intersection. motivation: needed to define standard subspaces in a Hilbert space #29251 https://ems.press/content/serial-article-files/48171 - [ ] depends on: #29230 for `Lattice` `CompleteLattice` - [ ] depends on: #29241 for the definition of `orthogonal`	merge-conflict blocked-by-other-PR	354/1	Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/Projection/Submodule.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	21-33999 21 days ago	21-33999 21 days ago	0-2553 42 minutes
29251	yoh-tanimoto author:yoh-tanimoto	feat(Analysis/InnerProductSpace/): define standard subspaces of a complex Hilbert space	define standard subspaces of a complex Hilbert space: a standard subspace `S` of `H` is a closed real subspace `S` such that `S ⊓ i S = ⊥` and `S ⊔ i S = ⊤`. prove that the symplectic complement of `S` is again a standard subspace and the double symplectic complement is itself. motivation: one can define a closable operator `x + i y ↦ x - i y` and develop an analogue of the Tomita-Takesaki modular theory for von Neumann algebras. By considering inclusions of standard subspaces, one can obtain unitary representations of various Lie groups. https://ems.press/content/serial-article-files/48171 - [ ] depends on: #29230 for `Lattice` `CompleteLattice` - [ ] depends on: #29241 for the definition of `orthogonal` - [ ] depends on: #29243 for `sup_orthogonal` - [ ] depends on: #29235 for `mapEquiv`	merge-conflict blocked-by-other-PR	699/2	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/Projection/Submodule.lean,Mathlib/Analysis/InnerProductSpace/StandardSubspace.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	21-33876 21 days ago	21-33877 21 days ago	0-3098 51 minutes
28733	CBirkbeck author:CBirkbeck	E2 s transform	--- - [ ] depends on : #29115 - [ ] depends on: #27606 - [ ] depends on" #26014 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR	2068/19	Mathlib.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/IntegerCompl.lean,Mathlib/Analysis/Complex/Norm.lean,Mathlib/Analysis/Complex/SummableUniformlyOn.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/IccSums.lean,Mathlib/NumberTheory/LSeries/RiemannZeta.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Defs.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Summable.lean,Mathlib/NumberTheory/TsumDivsorsAntidiagonal.lean,Mathlib/Topology/Algebra/InfiniteConditionalSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean,Mathlib/Topology/Algebra/Monoid/Defs.lean,Mathlib/Topology/UniformSpace/LimUnder.lean	24	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	21-32364 21 days ago	unknown	unknown
26858	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Define the associated graded ring to filtered ring	Define the associated graded ring to a filtered ring. --- - [ ] depends on: #26857 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #20913	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	436/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	20-83932 20 days ago	unknown	unknown
26859	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Define associated graded algebra	Define the associated graded algebra of a filtered algebra, constructed from a special case of associated graded ring. --- - [ ] depends on: #26858 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #21806	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	547/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	20-83931 20 days ago	unknown	unknown
26860	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Define associated graded module	Define the associated graded module to a filtered module. --- - [ ] depends on: #26858 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #20940	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	651/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	20-83929 20 days ago	unknown	unknown
26861	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): define filtered add group hom	In this file we define filtered hom and the corresponding associated graded hom for abelian groups. Co-authored-by: Huanyu Zheng @Yu-Misaka Co-authored-by: Yi Yuan @yuanyi-350 Co-authored-by: Weichen Jiao @AlbertJ-314 --- - [ ] depends on: #26857 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #22632	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	376/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	20-83928 20 days ago	20-83929 20 days ago	0-1200 20 minutes
26862	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): define filtered ring homomorphism	In this PR, we define the filtered ring morphisms on rings and prove some basic properties of them. Co-authored-by: Huanyu Zheng @Yu-Misaka Co-authored-by: Yi Yuan @yuanyi-350 Co-authored-by: Weichen Jiao @AlbertJ-314 --- - [ ] depends on: #26858 - [ ] depends on: #26861 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #22208	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	806/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	20-83927 20 days ago	unknown	unknown
26863	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): define filtered alghom	In this PR, we define the filtered algebra homomorphisms on algebras and prove some basic properties of them. --- - [ ] depends on: #26859 - [ ] depends on: #26862 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #22454	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	1034/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	20-83926 20 days ago	unknown	unknown
26867	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): filtered module hom	In this PR we defined the filtered semi-linear map for filtered module and the associated graded module hom. --- - [ ] depends on: #26860 - [ ] depends on: #26862 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #22893	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	1182/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	20-83924 20 days ago	unknown	unknown
26868	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): associated graded exact of exact and strict	In this file, we define the concept of exhaustive filtrations. We also prove a AssociatedGradedRingHom sequence is exact iff each GradedPieceHom is exact. And when a sequence is strict exact, the corresponding AssociatedGradedRingHom sequence is also exact. Co-authored-by: Huanyu Zheng @Yu-Misaka Co-authored-by: Yi Yuan @yuanyi-350 Co-authored-by: Weichen Jiao @AlbertJ-314 --- - [ ] depends on: #26861 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #22707	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	532/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	20-83923 20 days ago	unknown	unknown
26869	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): exact of associated graded exact	We proved that a chain complex is exact if its associated graded complex is exact. Co-authored-by: Huanyu Zheng @Yu-Misaka Co-authored-by: Yi Yuan @yuanyi-350 Co-authored-by: Weichen Jiao @AlbertJ-314 --- - [ ] depends on: #26868 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #22972	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	723/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	20-83922 20 days ago	unknown	unknown
25903	pfaffelh author:pfaffelh	feat(MeasureTheory): finite unions of sets in a semi-ring (in terms of measure theory) form a ring	: Finite unions of sets in a semi-ring (in terms of measure theory) form a ring The set containing finite unions of sets in a semi-ring are a ring. Part of `MeasureTheory.SetSemiring` is moved to the new file `MeasureTheory.SetRing`. --- - [ ] depends on: #25902 [contains changes in `SetSemiring` as well] --- This PR continues the work from #23117. Original PR: https://github.com/leanprover-community/mathlib4/pull/23117	large-import t-measure-probability blocked-by-other-PR	648/131	Mathlib.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Module/Bimodule.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/Data/Set/Pairwise/Lattice.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/MeasurableSpace/Pi.lean,Mathlib/MeasureTheory/Measure/AddContent.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/MeasureTheory/SetAlgebra.lean,Mathlib/MeasureTheory/SetRing.lean,Mathlib/MeasureTheory/SetSemiring.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ExtractLets.lean,lake-manifest.json,lakefile.lean	16	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	17-48301 17 days ago	unknown	unknown
27510	chrisflav author:chrisflav	feat(RingTheory/Height): height of ideal is height of preimage plus height in quotient	If `S` has going-down over `R`, the height of a prime `P` lying over `p` equals the height of `p` plus the height of the image of `P` in `S / p S`. Co-authored by: Sihan Su Co-authored by: Yi Song --- - [ ] depends on: #22300 - [ ] depends on: #27508 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import blocked-by-other-PR	192/1	Mathlib/Data/Finset/Card.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/Ideal/GoingDown.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Basic.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean	10	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	17-46696 17 days ago	60-32343 1 month ago	0-1531 25 minutes
28972	themathqueen author:themathqueen	feat(LinearAlgebra/Matrix): star-algebra automorphisms on matrices are unitarily inner	Characterization of star-algebra automorphisms on matrices: for any star-algebra automorphism `f` on matrices, there exists a unitary matrix `U` such that `f x = U * x * star U`. --- - [ ] depends on: #28100 - [x] depends on: #28182 - [x] depends on: #28881 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	155/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Basic.lean,Mathlib/LinearAlgebra/Matrix/StarAlgEquiv.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'themathqueen']	nobody	17-41298 17 days ago	38-38974 1 month ago	0-412 6 minutes
28291	vasnesterov author:vasnesterov	feat(Tactic): tactic for computing asymptotics of real functions	It's an auxiliary PR which implements the entire `compute_asymptotics` tactic. I will split it into multiple small PRs if it is decided that we will merge it. --- In this PR I implement the `compute_asymptotics` tactic. Its purpose is to compute asymptotics of functions from `ℝ` to `ℝ`. So far it is able to compute the limit of any function constructed using arithmetic operations (`+`, `-`, ``, `/`, inversion), powers, logarithms, and exponents. ```lean import Mathlib.Tactic.ComputeAsymptotics open Real Filter Topology Asymptotics example : Tendsto (fun (x : ℝ) ↦ (1 + 6 x⁻¹) ^ (7 * x)) atTop (𝓝 (exp 42)) := by compute_asymptotics example : (fun x ↦ x - 1 - log x) ~[𝓝[≠] 1] (fun x ↦ (x - 1) ^ 2 / 2) := by compute_asymptotics example (a b : ℝ) (h : a < b) : (fun x ↦ (x + x * log x) ^ a) =O[atTop] (fun x ↦ (x / log x) ^ b) := by compute_asymptotics example : (fun x ↦ log x) =o[𝓝[>] 0] (fun x ↦ Real.pi / (exp (Real.log 2 * x) - 1)) := by compute_asymptotics ``` For more examples see `compute_asymptotics.lean` in tests. ### TODO * Support different domains in `compute_limit` as well. * Support trigonometric functions and Gamma-function. ### References I am basically implementing [this article](https://www21.in.tum.de/~eberlm/pdfs/real_asymp.pdf) about computing asymptotics in Isabelle by Manuel Eberl. - [ ] depends on: #23831 - [ ] depends on: #28874 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis t-meta merge-conflict blocked-by-other-PR WIP	17665/340	Mathlib.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Defs.lean,Mathlib/Analysis/SpecialFunctions/Complex/Analytic.lean,Mathlib/Data/Nat/Factorial/Basic.lean,Mathlib/Data/Seq/Parallel.lean,Mathlib/Data/Seq/Seq.lean,Mathlib/Data/Set/Pointwise/Interval.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ComputeAsymptotics.lean,Mathlib/Tactic/ComputeAsymptotics/Lemmas.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/BasisM.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/CompareMS.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/CompareReal.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/ConstSimp.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/ConstSimpAttribute.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/ConvertDomain.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/Defs.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/Exp.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/LeadingTerm.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/Log.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/MS.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/Misc.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/Normalization.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/Trimming.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Basic.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Basis.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Defs.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/LeadingTerm.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/LogBasis.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Add.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Basic.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Exp.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/ForPow.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Inv.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Log.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Merge.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Mul.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Pow.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Powser.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Term.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Trimming.lean,Mathlib/Tactic/NormNum/NatFactorial.lean,Mathlib/Topology/Algebra/Order/Field.lean,MathlibTest/compute_asymptotics.lean,scripts/README.md,scripts/migrate_to_fork.py,scripts/noshake.json	53	1	['mathlib4-dependent-issues-bot']	nobody	16-62983 16 days ago	52-47588 1 month ago	0-54 54 seconds
29282	Jlh18 author:Jlh18	feat(CategoryTheory): HasColimits instance onGrpd	Show that the category of groupoids has all small colimits, as a coreflective subcategory of `Cat`, which has all small colimits. The right adjoint of the forgetful functor is the core functor `CategoryTheory.Core.functor`. - [ ] depends on: #29283 [Core of a category as a functor] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict blocked-by-other-PR	140/4	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Colimit.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Core.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-55828 16 days ago	16-55829 16 days ago	0-396 6 minutes
29283	Jlh18 author:Jlh18	feat(CategoryTheory): define forgetful-core adjunction between Cat and Grpd	* Define `CategoryTheory.Core.functor`: the functor `Cat ⥤ Grpd` that on objects takes the core of a category * Define `CategoryTheory.Core.adjunction`: the adjunction with the forgetful functor `Grpd.forgetToCat` on the left, and the core functor `Core.functor` on the right. * Hence provide an instance that `Grpd.forgetToCat` is coreflective. - [ ] depends on: #29284 [Extra lemmas in CategoryTheory.Core] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict blocked-by-other-PR	104/4	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Core.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-55827 16 days ago	16-55827 16 days ago	0-3572 59 minutes
26136	vasnesterov author:vasnesterov	feat(Topology/Instances): Cantor set is homeomorphic to `ℕ → Bool`	* Prove that `Real.ofDigits` is a continuous map from `ℕ → Fin b` to `ℝ`. * Prove that the Cantor set is homeomorphic to `ℕ → Bool`. --- - [ ] depends on: #26096 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology merge-conflict blocked-by-other-PR	614/0	Mathlib.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Data/Nat/Cast/Order/Field.lean,Mathlib/Data/Real/OfDigits.lean,Mathlib/Topology/Instances/CantorSet.lean,scripts/noshake.json	6	8	['alreadydone', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'vasnesterov']	nobody	16-53032 16 days ago	90-78263 2 months ago	0-128 2 minutes
27950	alreadydone author:alreadydone	feat(MonoidAlgebra): criteria for `single` to be a unit, irreducible or prime	--- - [ ] depends on: #27936 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR WIP label:t-algebra$	714/192	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/Irreducible/Lemmas.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/GroupWithZero/Associated.lean,Mathlib/Algebra/MonoidAlgebra/Divisibility.lean,Mathlib/Algebra/MonoidAlgebra/NoZeroDivisors.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Prime/Defs.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Prime/Prod.lean,Mathlib/Data/Nat/Init.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/Frontend.lean	33	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	15-49935 15 days ago	58-9843 1 month ago	0-53 53 seconds
29764	ScottCarnahan author:ScottCarnahan	feat (Algebra/Vertex): API up to residue products (WIP)	This PR contains definitions leading up to the residue product of vertex operators and some basic properties. Parts will be split off as smaller PRs when I have time. --- - [ ] depends on: #25831 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	894/16	Mathlib.lean,Mathlib/Algebra/Vertex/HVertexOperator.lean,Mathlib/Algebra/Vertex/VertexOperator.lean,Mathlib/RingTheory/Binomial.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Binomial.lean,Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	15-42707 15 days ago	15-42709 15 days ago	0-25208 7 hours
29790	robertmaxton42 author:robertmaxton42	feat (IsCoherentWith) : families of maps from a coherent collection of subspaces lift uniquely to maps from the total space	* Adds `IsCoherentWith.liftCover`, which lifts a compatible family of continuous maps from each member of a coherent set of subspaces to a single continuous map on the whole space. * Adds `IsCoherentWith.liftCover'`, which does the same but for a set of coherent subspaces given as the range of a function into `Set X` rather than as an explicit `Set (Set X).` - [ ] depends on: #29788 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	350/3	Mathlib/Data/Set/Subset.lean,Mathlib/Data/Set/UnionLift.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Coherent.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Basic.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	15-1469 15 days ago	15-2837 15 days ago	0-4627 1 hour
27047	YaelDillies author:YaelDillies	feat: `MonoidHom.toAdditive''` as a `MulEquiv`	From Toric --- - [ ] depends on: #29800 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 blocked-by-other-PR label:t-algebra$	31/7	Mathlib/Algebra/Group/TypeTags/Hom.lean	1	5	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot']	adomani assignee:adomani	14-71177 14 days ago	14-71178 14 days ago	68-33171 68 days
27821	BGuillemet author:BGuillemet	feat(CategoryTheory/Sites/Sheaf): functorial version of Sheaf.homEquiv	Add two functorial versions of Sheaf.homEquiv, one using `yoneda` and the other using `coyoneda`. --- - [ ] depends on: #27819 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory blocked-by-other-PR	174/19	Mathlib/CategoryTheory/Sites/Sheaf.lean,Mathlib/CategoryTheory/Yoneda.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	14-40591 14 days ago	14-40618 14 days ago	0-2066 34 minutes
26872	faenuccio author:faenuccio	chore(RingTheory/Valuation/RankOne): modify the definition of Valuation.RankOne using its range rather than its codomain	We modify the definition of `RankOne` for a valuation in terms of its `valueGroup` rather than its codomain. Co-authored by María Inés de Frutos Fernández @mariainesdff - [ ] depends on: #26588 - [x] depends on: #26980 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author blocked-by-other-PR label:t-algebra$	257/34	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean	7	13	['faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	nobody	14-38913 14 days ago	14-38975 14 days ago	0-117 1 minute
29812	Jlh18 author:Jlh18	refactor: weaken HasPullbacks to HasPullback in MorphismProperty.Limits	The `HasPullbacks` instance on a category `C` for defining the `baseChange` / pullback functor along a map `f : X -> Y` between their over categories can be weakened to just a `HasPullback` condition on `f`. - [ ] depends on: #29795 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory blocked-by-other-PR	31/22	Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean,Mathlib/CategoryTheory/MorphismProperty/Limits.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	14-33244 14 days ago	14-41744 14 days ago	0-1983 33 minutes
29824	themathqueen author:themathqueen	feat(Algebra/Order/Star): add `StarOrderedRing (Π i, A i)`	--- - [ ] depends on: #29823 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	125/45	Mathlib.lean,Mathlib/Algebra/Group/Subgroup/Finite.lean,Mathlib/Algebra/Group/Submonoid/Finite.lean,Mathlib/Algebra/Order/Star/Pi.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	14-11723 14 days ago	14-15116 14 days ago	0-423 7 minutes
28067	grunweg author:grunweg	Docstring enumerations	Tracking PR; to be split. Audit all ocurrences of `^ \S`; exhaustive. --- - [x] depends on: #28068 - [x] depends on: #28069 - [ ] depends on: #28070 - [x] depends on: #28118 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	264/263	Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Module/LinearMap/Polynomial.lean,Mathlib/CategoryTheory/Abelian/NonPreadditive.lean,Mathlib/CategoryTheory/EqToHom.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/Pi.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/Condensed/Discrete/Characterization.lean,Mathlib/FieldTheory/ChevalleyWarning.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Basic.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/OuterMeasure/Basic.lean,Mathlib/MeasureTheory/OuterMeasure/Defs.lean,Mathlib/NumberTheory/FLT/Basic.lean,Mathlib/NumberTheory/LSeries/PrimesInAP.lean,Mathlib/RingTheory/Grassmannian.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean,Mathlib/RingTheory/WittVector/Teichmuller.lean,Mathlib/Tactic/Bound.lean,Mathlib/Tactic/Bound/Attribute.lean,Mathlib/Tactic/ENatToNat.lean,Mathlib/Tactic/FBinop.lean,Mathlib/Tactic/IntervalCases.lean,Mathlib/Tactic/TermCongr.lean,Mathlib/Util/Notation3.lean,Mathlib/Util/Superscript.lean,docs/Conv/Guide.lean	38	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	13-52070 13 days ago	13-52070 13 days ago	0-2904 48 minutes
29810	Jlh18 author:Jlh18	refactor: weaken HasPullbacks to HasPullback in MorphismProperty.OverAdjuction	- [ ] depends on: #29795 - [ ] depends on: #29812 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory blocked-by-other-PR	56/35	Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/MorphismProperty/Limits.lean,Mathlib/CategoryTheory/MorphismProperty/OverAdjunction.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	13-3303 13 days ago	13-3303 13 days ago	0-0 0 seconds
27789	staroperator author:staroperator	feat(ModelTheory): semilinear sets are closed under intersection and set difference	These are generalizations of the same results on `ℕ ^ k` (in #27414) to any cancellative monoid (e.g. `ℤ ^ k`). - [ ] depends on: #27414 - [x] depends on: #27786 - [x] depends on: #27787 - [x] depends on: #27955 - [x] depends on: #29034 - [x] depends on: #29035 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic blocked-by-other-PR	764/4	Mathlib.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Basic.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Defs.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Nat.lean	4	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	11-31187 11 days ago	11-31209 11 days ago	0-1510 25 minutes
29813	Jlh18 author:Jlh18	feat(CategoryTheory): define Over.pushforward	A morphism property `P` is stable under pushforward if `Over.pullback` also a left adjoint between the subcategory `P.Over ⊤ X` of the over category of objects satisfying the morphism-property. This definition makes sense when `HasPullacks T` is generalized to `[∀ {W : T} (h : W ⟶ Y), HasPullback h f]` just for the morphism we take pullbacks of. See Joyal's pi-clans (https://arxiv.org/pdf/1710.10238) - [ ] depends on: #29795 - [ ] depends on: #29812 - [ ] depends on: #29810 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory blocked-by-other-PR	84/35	Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/MorphismProperty/Limits.lean,Mathlib/CategoryTheory/MorphismProperty/OverAdjunction.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	10-55884 10 days ago	10-55884 10 days ago	0-0 0 seconds
29770	xroblot author:xroblot	feat(DedekindDomain): formulas for the different ideal in the compositum of disjoint extensions	Let `A ⊆ B` be a finite extension of Dedekind domains and assume that `A ⊆ R₁, R₂ ⊆ B` are two subrings such that `R₁ ⊔ R₂ = B`, their fractions fields are linearly disjoint (over the fraction field of `A`) and that `𝓓(R₁/A)` and `𝓓(R₂/A)` are coprime, where `𝓓` denote the different ideal. We prove in particular: `𝓓(B/A) = 𝓓(R₁/A) * 𝓓(R₂/A)` --- - [ ] depends on: #26155 - [ ] depends on: #26396	large-import t-algebra blocked-by-other-PR label:t-algebra$	430/44	Mathlib.lean,Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/LinearDisjoint.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Trace/Basic.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	9-51912 9 days ago	15-49671 15 days ago	0-1515 25 minutes
29940	xroblot author:xroblot	feat(NumberTheory): basic results about discriminants in an extension	--- - [ ] depends on: #26155 - [ ] depends on: #28797	t-number-theory blocked-by-other-PR	404/22	Mathlib/NumberTheory/NumberField/Discriminant/Different.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/Ideal/GoingUp.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	9-48414 9 days ago	9-48442 9 days ago	0-91 1 minute
27980	smmercuri author:smmercuri	feat: dimensions of completions at infinite place extensions	This PR continues the work from #24853. Original PR: https://github.com/leanprover-community/mathlib4/pull/24853 --- - [x] depends on: #27977 - [ ] depends on: #27978 - [ ] depends on: #27974 - [x] depends on: #27975 - [ ] depends on: #27976 - [ ] depends on: #29942 - [ ] depends on: #29946	large-import FLT t-number-theory merge-conflict blocked-by-other-PR	619/2	Mathlib.lean,Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/NumberTheory/NumberField/Completion.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Dimension.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	7	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	9-37024 9 days ago	9-37024 9 days ago	0-3752 1 hour
25900	pfaffelh author:pfaffelh	feat (Topology/Compactness/CompactSystem): Set system of finite unions of sets in a compact system is again a compact system	feat (Topology/Compactness/CompactSystem): The set system of finite unions of sets in a compact system is a compact system A compact system is a set system with the following property: If all finite intersections of a sequence in the set system is non-empty, the countable intersection is not empty. Starting with a compact system, consider the finite unions of sets in the copact system. Such sets again form a compact system (`IsCompactSystem.union.isCompactSystem`). --- - [x] depends on: #24906 - [ ] depends on: #25899 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24543. Original PR: https://github.com/leanprover-community/mathlib4/pull/24543	t-topology merge-conflict blocked-by-other-PR	996/66	Mathlib.lean,Mathlib/Data/Set/Accumulate.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/Constructions/Cylinders.lean,Mathlib/MeasureTheory/Constructions/ProjectiveFamilyContent.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/Topology/Compactness/CompactSystem.lean	8	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	9-2533 9 days ago	9-2533 9 days ago	0-850 14 minutes
25906	pfaffelh author:pfaffelh	feat (Topology/Compactness/CompactSystem): Closed and compact square cylinders form a compact system.	feat (Topology/Compactness/CompactSystem): Closed and compact square cylinders form a compact system. A square cylinder is a set of the form `s.pi t` in a product space. A closed compact square cylinder has `IsClosed (t i)` and `IsCompact (t i)` for all `i ∈ s`. This set system is a compact system (as introduced in PR #25899). Streamline the definition of square cylinders in MeasureTheory/Constructions/Cylinders on the way. Co-authors: Rémy Degenne remy.degenne@inria.fr --- - [ ] depends on: #25899 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24542. Original PR: https://github.com/leanprover-community/mathlib4/pull/24542	t-topology merge-conflict blocked-by-other-PR	716/65	Mathlib.lean,Mathlib/Data/Set/Accumulate.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/Constructions/Cylinders.lean,Mathlib/MeasureTheory/Constructions/ProjectiveFamilyContent.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/Topology/Compactness/CompactSystem.lean	8	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	9-2531 9 days ago	9-2532 9 days ago	0-383 6 minutes
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: #xyz [optional extra text] --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor awaiting-author blocked-by-other-PR	70/3	Mathlib/Analysis/NormedSpace/HahnBanach/Separation.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/Topology/Order/OrderClosed.lean	3	14	['faenuccio', 'fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'mcdoll', 'themathqueen', 'yuanyi-350']	faenuccio assignee:faenuccio	8-69305 8 days ago	8-69307 8 days ago	21-29486 21 days
26304	Raph-DG author:Raph-DG	feat(AlgebraicGeometry): Definition of algebraic cycles	In this PR we define algebraic cycles on a scheme X to be functions from the points of X to the integers with locally finite support. We introduce some API for this including grading by height in the specialization order, and a definition of the pushforward. - [ ] depends on: #26225 - [ ] depends on: #26259 --- Note there are a couple of things I'm not quite sure about which I've mentioned in the comments, like how I'm not sure how to make the proof of map_locally finite more manageable and so on. Any comment on these (or anything else!) would be greatly appreciated. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry RFC merge-conflict blocked-by-other-PR	439/22	Mathlib.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/AlgebraicCycle.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Topology/LocallyFinsupp.lean	6	6	['Raph-DG', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	8-62835 8 days ago	60-59188 1 month ago	0-366 6 minutes
27579	RemyDegenne author:RemyDegenne	feat: risk of an estimator, DeGroot statistical information, total variation distance	This is an overview PR and will be cut into several pieces. It contains definitions and properties of: - the risk and Bayes risk of an estimator, in general and then specialized to binary hypothesis testing - the DeGroot statistical information between two measures, as well as a generalization for a kernel on more than two outcomes - the total variation distance between measures, defined as a special case of the DeGroot statistical information Co-authored-by: Lorenzo Luccioli @LorenzoLuccioli From the TestingLowerBounds project --- - [x] depends on: #27583 - [x] depends on: #27584 - [x] depends on: #27585 - [x] depends on: #27586 - [x] depends on: #27587 - [x] depends on: #27591 - [x] depends on: #28081 - [x] depends on: #28082 - [x] depends on: #28117 - [x] depends on: #28341 - [x] depends on: #29137 - [ ] depends on: #29143 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict blocked-by-other-PR WIP	1956/17	Mathlib.lean,Mathlib/InformationTheory/TotalVariation/Basic.lean,Mathlib/Probability/Decision/AuxLemmas.lean,Mathlib/Probability/Decision/BayesEstimator.lean,Mathlib/Probability/Decision/Binary.lean,Mathlib/Probability/Decision/BoolMeasure.lean,Mathlib/Probability/Decision/DeGrootInfo.lean,Mathlib/Probability/Decision/Risk/Basic.lean,Mathlib/Probability/Decision/Risk/Countable.lean,Mathlib/Probability/Decision/RiskIncrease.lean,Mathlib/Probability/Decision/ZeroOneLoss.lean,Mathlib/Probability/Kernel/Composition/Comp.lean,Mathlib/Probability/Kernel/Composition/MapComap.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Kernel/RadonNikodym.lean	15	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	8-61010 8 days ago	21-34884 21 days ago	0-1 1 second
29610	llllvvuu author:llllvvuu	feat(LinearAlgebra): define LinearMap.Eigenbasis	Some theorems are left TODO for follow-up work. The definition is from @eric-wieser ([#Is there code for X? > diagonalizable linear maps @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/diagonalizable.20linear.20maps/near/539163222)). Co-authored-by: Aristotle Harmonic --- - [x] depends on: #29420 (golfs some `[Nontrivial R]` assumptions) - [ ] depends on: #29791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	458/5	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/LinearAlgebra/Eigenbasis.lean,Mathlib/LinearAlgebra/FreeModule/PID.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/CompleteLattice/Basic.lean	6	29	['github-actions', 'kckennylau', 'llllvvuu', 'mathlib4-dependent-issues-bot']	nobody	8-34954 8 days ago	15-2819 15 days ago	3-22329 3 days
29942	smmercuri author:smmercuri	feat(InfinitePlace/Completion): embeddings of `w.Completion` factor through embeddings of `v.Completion` when `w` extends `v`	If `w : v.Extension L` is an extension of `v : InfinitePlace K` to `L`, then `extensionEmbedding w : L →+* ℂ` factors through `extensionEmbedding v : K →+* ℂ`. --- - [ ] depends on: #27978 - [ ] depends on: #29969 - [x] depends on: #29944 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT blocked-by-other-PR	199/58	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Completion.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean,Mathlib/Topology/MetricSpace/Completion.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	8-33440 8 days ago	9-37076 9 days ago	0-1122 18 minutes
29934	smmercuri author:smmercuri	feat(Field/WithAbs): the lift of a ring homomorphism from `WithAbs v` to `WithAbs w` to their completions	If `σ` is a compatible ring homomomorphism between `WithAbs v` and `WithAbs w` then this extends to a natural ring homomorphism between completions `v.Completion` and `w.Completion`. Also fix some defeq abuse in `Field/WithAbs`. --- - [ ] depends on: #29969 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT blocked-by-other-PR WIP	104/48	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Completion.lean,Mathlib/Topology/MetricSpace/Completion.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	8-33439 8 days ago	8-36902 8 days ago	0-2230 37 minutes
29997	xroblot author:xroblot	feat(CyclotomicFields): general formula for the discriminant	Add the general formula for the (absolute value of the) discriminant of a cyclotomic field: ```lean theorem natAbs_absdiscr (n : ℕ) [hn : NeZero n] [hK : IsCyclotomicExtension {n} ℚ K] : (discr K).natAbs = (n ^ n.totient / ∏ p ∈ n.primeFactors, p ^ (n.totient / (p - 1))) ``` --- - [ ] depends on: #29665 - [ ] depends on: #29943	large-import t-number-theory blocked-by-other-PR	1165/69	Mathlib.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean,Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/NumberTheory/Cyclotomic/Basic.lean,Mathlib/NumberTheory/Cyclotomic/Rat.lean,Mathlib/NumberTheory/NumberField/Discriminant/Different.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/DedekindDomain/LinearDisjoint.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/Ideal/GoingUp.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Trace/Basic.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean	20	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	7-60707 7 days ago	7-60708 7 days ago	0-2027 33 minutes
29943	xroblot author:xroblot	feat(NumberField): discriminant in disjoint extensions	We prove the following results: - If `K₁` and `K₂` are linear disjoint number fields with coprime different ideals, then ``` (discr L).natAbs = (discr K₁).natAbs ^ Module.finrank ℚ K₂ * (discr K₂).natAbs ^ Module.finrank ℚ K₁ ``` where `L = K₁K₂`. - If `K₁` and `K₂` are number fields with coprime discriminant and `K₁/ℚ` Galois, then `K₁` and `K₂` are linear disjoint. --- - [ ] depends on: #29940 - [ ] depends on: #29885 - [ ] depends on: #27273	large-import t-number-theory merge-conflict blocked-by-other-PR	1022/67	Mathlib.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean,Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/NumberTheory/NumberField/Discriminant/Different.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/DedekindDomain/LinearDisjoint.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/Ideal/GoingUp.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Trace/Basic.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean	18	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	7-59347 7 days ago	7-59348 7 days ago	0-3930 1 hour
30001	vihdzp author:vihdzp	feat: concept generated by set of objects/attributes	--- - [ ] depends on: #29996 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order blocked-by-other-PR	270/99	Mathlib/Order/Concept.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	7-57103 7 days ago	7-57104 7 days ago	0-375 6 minutes
26966	vihdzp author:vihdzp	feat: the Dedekind-MacNeille completion	We define the type of Dedekind cuts `DedekindCut α` as an abbreviation for `Concept α α (· ≤ ·)`. We prove that it's the smallest complete lattice containing a given partial order, in the sense that any embedding from `α` into a complete lattice factors through it. --- The idea here is that one should be able to work with Dedekind cuts without knowing what a concept lattice is; whence the abbreviation. See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Dedekind-MacNeille.20completion.2E/near/528004148). - [ ] depends on: #30001 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order blocked-by-other-PR	500/104	Mathlib.lean,Mathlib/Order/Completion.lean,Mathlib/Order/Concept.lean	3	12	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	7-50782 7 days ago	7-52305 7 days ago	0-19769 5 hours
23124	YaelDillies author:YaelDillies	feat(MetricSpace): nets	Define nets, which are a quantitative notion of compactness in a metric space. From my PhD (MiscYD) --- - [x] depends on: #23180 - [ ] depends on: #23181 - [ ] depends on: #23920 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-CI blocked-by-other-PR	1011/695	Mathlib.lean,Mathlib/Data/Rel.lean,Mathlib/Data/Rel/Cover.lean,Mathlib/Data/Rel/Separated.lean,Mathlib/Dynamics/TopologicalEntropy/CoverEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Dynamics/TopologicalEntropy/NetEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/Semiconj.lean,Mathlib/Dynamics/TopologicalEntropy/Subset.lean,Mathlib/InformationTheory/Hamming.lean,Mathlib/MeasureTheory/Measure/RegularityCompacts.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/MetricSpace/Cover.lean,Mathlib/Topology/MetricSpace/MetricSeparated.lean,Mathlib/Topology/MetricSpace/PiNat.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/UniformSpace/Ascoli.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Cauchy.lean,Mathlib/Topology/UniformSpace/Compact.lean,Mathlib/Topology/UniformSpace/CompactConvergence.lean,Mathlib/Topology/UniformSpace/Completion.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/DiscreteUniformity.lean,Mathlib/Topology/UniformSpace/Equicontinuity.lean,Mathlib/Topology/UniformSpace/HeineCantor.lean,Mathlib/Topology/UniformSpace/OfCompactT2.lean,Mathlib/Topology/UniformSpace/OfFun.lean,Mathlib/Topology/UniformSpace/Separation.lean,Mathlib/Topology/UniformSpace/Ultra/Basic.lean,Mathlib/Topology/UniformSpace/Ultra/Completion.lean,Mathlib/Topology/UniformSpace/Ultra/Constructions.lean,Mathlib/Topology/UniformSpace/UniformApproximation.lean,Mathlib/Topology/UniformSpace/UniformConvergence.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	35	21	['D-Thomine', 'YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	7-35313 7 days ago	7-35334 7 days ago	1-52822 1 day
27314	pechersky author:pechersky	feat(TopologyValued): `Valued` based on a range topology	Switch from a topology based on `fun γ : Γ₀ˣ => (v.ltAddSubgroup γ : AddSubgroup R)` to ``` fun rs : {rs : R × R // v rs.1 ≠ 0 ∧ v rs.2 ≠ 0} ↦ (v.ltAddSubgroup (Units.mk0 (v rs.val.2 / v rs.val.1) (by simp [rs.prop])) : AddSubgroup R) ``` This is in preparation for using `IsValuativeTopology` instead. In fact, that basis is precisely what `ValuativeTopology` asserts. `Valued.mk'` is kept, we do not yet rely on `IsValuativeTopology` and `UniformSpace`. The new `Valued` behaves the same way as it did before for `MulArchimedean` valuation codomains, which are all of the current in-mathlib uses of `Valued`. This is, for rank-one valuations. For valuations which rank one, but do not pass to the whole codomain, there are helper lemmas to discuss open/closed/clopen sets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #27264 - [x] depends on: #27265 - [ ] depends on: #27163 - [ ] depends on: #27339	t-topology merge-conflict blocked-by-other-PR	733/259	Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/NumberTheory/FunctionField.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Valuation/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	12	9	['github-actions', 'kckennylau', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	7-18253 7 days ago	54-37735 1 month ago	0-22127 6 hours
29777	yuanyi-350 author:yuanyi-350	feat(Functional Analysis) : Closed Range Theorem	- [ ] depends on: #29151 [Corollary of Hahn-Banach theorem] - [ ] depends on: #29776 [refactor ContinuousLinearMap.isOpenMap by separating it into sublemmas] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-analysis awaiting-author blocked-by-other-PR WIP	250/27	Mathlib.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/ClosedRange.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Separation.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/Topology/Order/OrderClosed.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	faenuccio assignee:faenuccio	6-72779 6 days ago	13-3739 13 days ago	0-634 10 minutes
30010	xroblot author:xroblot	feat(CyclotomicFields): generalize `IsPrimitiveRoot.integralPowerBasis` to all (nonzero) integers	--- - [ ] depends on: #29997	large-import t-number-theory blocked-by-other-PR	1278/87	Mathlib.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean,Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/NumberTheory/Cyclotomic/Basic.lean,Mathlib/NumberTheory/Cyclotomic/Rat.lean,Mathlib/NumberTheory/NumberField/Discriminant/Different.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/DedekindDomain/LinearDisjoint.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/Ideal/GoingUp.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Trace/Basic.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean	20	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	6-67846 6 days ago	6-67847 6 days ago	0-1706 28 minutes
29992	vlad902 author:vlad902	feat(Order): finite (Max)Chains always contains a top/max element	- [ ] depends on: #29835 [optional extra text] - [ ] depends on: #29993 [optional extra text] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-order blocked-by-other-PR	35/0	Mathlib/Order/Preorder/Chain.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	6-30778 6 days ago	7-68765 7 days ago	0-466 7 minutes
29980	mans0954 author:mans0954	refactor(RingTheory/Polynomial/Resultant/Quadratic): Re-implement QuadraticDiscriminant for R[X]	Re-implement `Algebra/QuadraticDiscriminant` for polynomials. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/discriminants.20of.20low.20degree.20polynomials/with/538010519) --- - [ ] depends on: #29981 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	214/0	Mathlib.lean,Mathlib/RingTheory/Polynomial/Resultant/Quadratic.lean,Mathlib/RingTheory/Polynomial/SmallDegreeVieta.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	6-25642 6 days ago	8-12932 8 days ago	0-3907 1 hour
29921	mans0954 author:mans0954	refactor(RingTheory/Polynomial/SmallDegreeVieta) : Convert to {p : R[X]} (hp : p.natDegree = 2)	Convert `RingTheory/Polynomial/SmallDegreeVieta` from `{a b c : R} (C a * X ^ 2 + C b * X + C c)` to `{p : R[X]} (hp : p.natDegree = 2)` (see [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/discriminants.20of.20low.20degree.20polynomials/with/538010519)) --- - [ ] depends on: #29981 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	81/60	Mathlib/RingTheory/Polynomial/SmallDegreeVieta.lean	1	6	['JovanGerb', 'github-actions', 'kckennylau', 'mans0954', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	6-19860 6 days ago	8-12923 8 days ago	1-7032 1 day
29985	urkud author:urkud	feat: exterior derivative of a differential form	--- - [ ] depends on: #29957 - [x] depends on: #29984 - [x] depends on: #29986 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis blocked-by-other-PR	362/0	Mathlib.lean,Mathlib/Analysis/Calculus/EDeriv/Basic.lean,Mathlib/Analysis/NormedSpace/Alternating/Basic.lean,Mathlib/Analysis/NormedSpace/Alternating/Uncurry/Fin.lean	4	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	6-6448 6 days ago	6-6473 6 days ago	0-1264 21 minutes
28786	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): restate Turán's theorem in terms of `extremalNumber`	Restates the existing proof of Turán's theorem in terms of the extremal numbers of `⊤`: The `turanGraph` is, up to isomorphism, the unique extremal graph forbidding `⊤`. --- - [ ] depends on: #28719 - [x] depends on: #28785 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	63/46	Mathlib/Combinatorics/SimpleGraph/Extremal/Turan.lean	1	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-62516 5 days ago	5-65974 5 days ago	2-84097 2 days
29868	themathqueen author:themathqueen	feat(LinearAlgebra/Matrix/PosDef): add `posSemidef_sum`	--- - [x] depends on: #29862 - [ ] depends on: #29864 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	84/53	Mathlib/Algebra/Order/BigOperators/Group/Finset.lean,Mathlib/Algebra/Order/BigOperators/Group/Multiset.lean,Mathlib/Algebra/Order/Group/Int/Sum.lean,Mathlib/Data/NNRat/BigOperators.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/Tactic/Positivity/Finset.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'themathqueen']	nobody	5-53908 5 days ago	12-23000 12 days ago	0-24 24 seconds
30050	themathqueen author:themathqueen	chore(Analysis/Matrix/Order): `IsStrictlyPositive x` iff `x.PosDef`	--- - [ ] depends on: #29896 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed large-import t-algebra blocked-by-other-PR label:t-algebra$	311/278	Mathlib.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/Matrix/Order.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,MathlibTest/PosDef.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	5-51298 5 days ago	5-52432 5 days ago	0-12 12 seconds
26315	EtienneC30 author:EtienneC30	feat: continuous sesquilinear forms	Introduce an abbreviation `ContinuousSesquilinForm` for `E →L⋆[𝕜] E →L[𝕜] 𝕜`. This is needed in the Brownian motion project, as a Gaussian measure is represented by its mean and its covariance bilinear form, which is a positive semidefinite bilinear form. --- - [x] depends on: #26274 - [ ] depends on: #28052 From Brownian motion [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis blocked-by-other-PR	432/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/ContinuousSesquilinForm.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean,Mathlib/LinearAlgebra/SesquilinearForm/IsPosSemidef.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	7	10	['EtienneC30', 'RemyDegenne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-49768 5 days ago	5-49792 5 days ago	0-0 0 seconds
22059	grunweg author:grunweg	feat: manifolds with smooth boundary	Needs polish, and closing the remaining sorries (or deciding they can be postponed later). From my bordism theory project. --- - [x] depends on: #22070 - [x] depends on: #22128 - [x] depends on: #22131 - [x] depends on: #22082 - [x] depends on: #22113 - [x] depends on: #22105 - [x] depends on: #26099 - [x] depends on: #30049 (preliminary code clean-up) - [ ] depends on: #29589 - [ ] depends on the analogous result for direct sums, still to be written - [ ] depends on #23040 for the mathlib-level definition of smooth immersions and embeddings [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	603/0	Mathlib.lean,Mathlib/Geometry/Manifold/HasSmoothBoundary.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	5-49316 5 days ago	175-43251 5 months ago	0-0 0 seconds
27493	themathqueen author:themathqueen	feat(RingTheory/Coalgebra): define Frobenius algebra	A Frobenius algebra `A` has the structure of both an algebra and a coalgebra such that: `(mul ⊗ id) ∘ assoc.symm ∘ (id ⊗ comul) = comul ∘ mul = (id ⊗ mul) ∘ assoc ∘ (comul ⊗ id)`. In diagrams this law looks like: ![](https://ncatlab.org/nlab/files/frobenius_laws.jpg) It suffices to show that `(mul ⊗ id) ∘ assoc.symm ∘ (id ⊗ comul) = (id ⊗ mul) ∘ assoc ∘ (comul ⊗ id)` (the proof of this is ugly). --- - [ ] depends on: #27567 - [x] depends on: #27569 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	224/0	Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/Coalgebra/Frobenius.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	5-47418 5 days ago	60-32173 1 month ago	2-700 2 days
29274	Jlh18 author:Jlh18	feat(CategoryTheory): HasLimits instance on Grpd	- Show that the quotient of a groupoid is a groupoid in `CategoryTheory.Quotient`. - Define the free groupoid on a category in `CategoryTheory.Category.FreeGroupoid` and hence define the free-forgetful adjunction between `Grpd` and `Cat`. - Use the free-forgetful adjunction to show that `Grpd` has all limits in `CategoryTheory.Category.Grpd.Limit`, as a reflective subcategory of `Cat`. - [ ] depends on: #29250[Renamings in Grpd file] - [ ] depends on: #29278[Quotient of a groupoid is a groupoid] - [ ] depends on: #29279[Free forgetful adjunction] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor blocked-by-other-PR	246/1	Mathlib.lean,Mathlib/CategoryTheory/Category/FreeGroupoid.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Limit.lean,Mathlib/CategoryTheory/Quotient.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-55072 4 days ago	4-55080 4 days ago	0-340 5 minutes
28685	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): prove the minimal-degree version of the Erdős-Stone theorem	Proves the minimal degree-version of the Erdős-Stone theorem: If `G` has a minimal degree of at least `(1 - 1 / r + o(1)) * card V`, then `G` contains a copy of a `completeEquipartiteGraph` in `r + 1` parts each of size `t`. The double-counting construction from the proof is available in `namespace ErdosStone`. --- - [ ] depends on: #25843 - [x] depends on: #27597 - [ ] depends on: #27599 - [x] depends on: #28443 - [x] depends on: #28445 - [x] depends on: #28446 - [x] depends on: #28447 Similar to #25841 I've tried to make as much of the double-counting construction not private as possible. I figure it is useful to borrow constructions between proofs. If this is just considered garbage and bloat and better left private. Please let me know. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict blocked-by-other-PR WIP	582/14	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Operations.lean,Mathlib/Data/Finset/Union.lean,Mathlib/Data/Nat/Cast/Order/Field.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-53609 4 days ago	36-45652 1 month ago	0-46 46 seconds
27706	xroblot author:xroblot	feat(RingTheory/Localization/AtPrime): inertia degree and ramification index are preserved by localization	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 prove that the bijection between the (nonzero) prime ideals of `Sₚ` and the prime ideals of `S` above `p` preserves the residual degree and the ramification index. --- - [x] depends on: #27794 - [x] depends on: #27796 - [x] depends on: #27798 - [x] depends on: #28526 - [ ] depends on: #29322	t-ring-theory blocked-by-other-PR	508/122	Mathlib.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/RingTheory/DedekindDomain/Instances.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/Localization/AtPrime/Extension.lean,Mathlib/RingTheory/Trace/Quotient.lean	8	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-41167 4 days ago	4-41167 4 days ago	0-1400 23 minutes
28895	yury-harmonic author:yury-harmonic	feat(NumberTheory): prove Zsigmondy's theorem	--- - [x] depends on: #28879 - [x] depends on: #28825 - [ ] depends on: #28833 - [x] depends on: #28888 - [x] depends on: #28830 - [x] depends on: #28765 - [x] depends on: #28886 - [x] depends on: #28934 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	1412/18	Mathlib.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/MvPolynomial/Expand.lean,Mathlib/NumberTheory/Zsigmondy.lean	4	7	['dupuisf', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'yury-harmonic']	nobody	4-40188 4 days ago	35-60997 1 month ago	0-0 0 seconds
29000	JovanGerb author:JovanGerb	feat(Tactic/Push): add basic tags and tests	This PR adds basic `@[push]` tags, and expands the `push` test file. --- - [ ] depends on: #21965 - [ ] depends on: #30038 - [ ] depends on: #30039 - [ ] depends on: #30042 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	290/196	Archive/Imo/Imo1988Q6.lean,Archive/ZagierTwoSquares.lean,Counterexamples/Phillips.lean,Mathlib/Algebra/Group/Action/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/ListOfFn.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Order/Module/HahnEmbedding.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Oscillation.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/PosLog.lean,Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/Combinatorics/Colex.lean,Mathlib/Combinatorics/Enumerative/InclusionExclusion.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/Matroid/Dual.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Data/Analysis/Filter.lean,Mathlib/Data/Finset/BooleanAlgebra.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Empty.lean,Mathlib/Data/Finset/Filter.lean,Mathlib/Data/Finset/Insert.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Finset/SDiff.lean,Mathlib/Data/Finset/Sups.lean,Mathlib/Data/Finset/Union.lean,Mathlib/Data/Fintype/Defs.lean,Mathlib/Data/Nat/Cast/Basic.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/PrimeFin.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Data/Set/Prod.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/RootSystem/Base.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Order.lean,Mathlib/MeasureTheory/Constructions/Cylinders.lean,Mathlib/MeasureTheory/Constructions/Polish/Basic.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Finite.lean,Mathlib/MeasureTheory/SetAlgebra.lean,Mathlib/NumberTheory/AbelSummation.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/ModularForms/DedekindEta.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/CompleteLatticeIntervals.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/Interval/Set/Defs.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Order/PartialSups.lean,Mathlib/Order/SetNotation.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/Probability/Moments/ComplexMGF.lean,Mathlib/Probability/ProductMeasure.lean,Mathlib/RingTheory/HahnSeries/Summable.lean,Mathlib/RingTheory/Nilpotent/Defs.lean,Mathlib/Topology/Algebra/ProperAction/ProperlyDiscontinuous.lean,Mathlib/Topology/Bornology/BoundedOperation.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Compactness/Lindelof.lean,Mathlib/Topology/Connected/Clopen.lean,Mathlib/Topology/ContinuousMap/BoundedCompactlySupported.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean,Mathlib/Topology/GDelta/MetrizableSpace.lean,Mathlib/Topology/JacobsonSpace.lean,Mathlib/Topology/Order/Compact.lean,Mathlib/Topology/Order/HullKernel.lean,Mathlib/Topology/Perfect.lean,Mathlib/Topology/Sets/CompactOpenCovered.lean,MathlibTest/push.lean	87	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-33987 4 days ago	4-34259 4 days ago	4-45292 4 days
27391	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): pseudofunctoriality structure of categorical pullback squares	Using pseudofunctoriality of the construction `CatCommSqOver`, we show that categorical pullback squares have pseudofunctorial-like structures: given a `CatCommSq T L R B` and a `CatPullbackSq T' L' R' B'`, and a `CatCospanTransform R B R' B'`, there is a functor `CatPullbackSq.functorOfTransform` between the top left corners of the two squares. We give `CatCommSq` instances that relates this functor with other constructions such as `CatCommSqOver.transform`. Similarly, we construct `CatPullbackSq.functorOfTransform₂`, that maps morphisms of `CatCospanTransforms` to natural transformations. Finally, we show that `functorOfTransform` respects identities and compositions. We do not yet prove that all of this data satisfies all the expected properties of pseudofunctors: this will be the content of a follow-up PR. --- - [ ] depends on: #27214 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR	1090/1	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-33937 4 days ago	4-33938 4 days ago	0-264 4 minutes
27432	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): pseudofunctoriality of categorical pulback squares	In this PR, we show that the "unbundled pseudofunctor" data constructed in #27391 satisfy the axioms of an actual "unbundled pseudo-functor". This is intended to give all the required coherence for a formal bicategory-like proof of the fact that `CatCospanAdjunction`s from #26578 (resp. `CatCospanEquivalence`s from #26579) promote to adjunctions (resp. equivalences) between the top left corners of categorical pullback squares. --- - [ ] depends on: #27391 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR	1244/1	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-33935 4 days ago	4-33936 4 days ago	0-1056 17 minutes
27481	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): adjunctions and equivalences of categorical pullback squares	We show that a `CatCospanAdjunction` (resp `CatCospanEquivalence`) induces adjunctions (resp. equivalences) of the categories that sit at the top left corners of categorical pullback squares via the pseudofunctoriality proved in #27432. Thanks to the lemmas that proves that categorical pullback squares are fully pseudofunctorial, the proof is purely formal ("a pseudofunctor maps adjunctions (resp. equivalences) to adjunctions (resp. equivalences)"), rather than being a painful computation for the triangle equalities. In particular, the results here show that two categorical pullback squares with equivalent "underlying categorical cospan" are equivalent, which realizes the equivalence-invariance of the notion of categorical pullbacks. We do not yet show that a (not-necessarily pullback) `CatCommSq T L R B` equivalent to a `CatPullbackSquare T' L' R' B'` via a `CatCospanEquivalence R B R' B'` is also a `CatPullbackSquare`: this will be the content of a follow-up PR. --- - [ ] depends on: #27432 - [ ] depends on: #26579 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict blocked-by-other-PR	1829/1	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-33933 4 days ago	4-33934 4 days ago	0-49 49 seconds
27686	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical/Square): more API for `CatPullbackSquare`	In this PR, we provide more API around the notion of categorical pullback squares. Having established the pseudofunctoriality of the notion in #27432, we characterize the behaviour of the equivalence `CatPullbackSquare.functorEquiv (π₁ R B) (π₂ R B) R B X : X ⥤ R ⊡ B ≌ CatCommSqOver R B X` via various (d)simp lemmas. This ports all the pseudofunctoriality and equivalence-invariance results of `CatPullbackSquare` to `CategoricalPullback`. We also show this equivalence is isomorphic to the one from `CategoricalPullback.functorEquiv`. Unfortunately, this small duplication is necessary, as `CatPullbackSquare.functorEquiv` is bulit using `CategoricalPullback.functorEquiv`. The equivalence `CategoricalPullback.functorEquiv` is now an implementation detail, the idiomatic way is to use `CatPullbackSquare.functorEquiv`; docstrings are updated accordingly. This deprecates some constructions and lemmas for `CategoricalPullback`: they are now special case of the API that is available for any categorical pullback square. --- - [ ] depends on: #27481 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict blocked-by-other-PR	2245/74	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	4	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-33808 4 days ago	unknown	unknown
27687	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): squares equivalent to a `CatPullbackSquare`	We provide the last remaining piece of the "equivalence-invariance" of categorical pullback squares: given a `CatCommSq (T : C₁ ⥤ _) L R B`, a `CatPullbackSquare (T' : D₁ ⥤ _) L' R' B'`, a `ψ : CatCospanEquivalence R B R' B'` and an equivalence `C₁ ≌ D₁` that identifies to the functor induced by `ψ`, the `CatCommSq T L R B` can be promoted to a `CatPullbackSquare T L R B'`. In other words: a `CatCommSq` that is equivalent to a `CatPullbackSquare` is a `CatPullbackSquare`. --- - [ ] depends on: #27686 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict blocked-by-other-PR	2318/74	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	4	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-33806 4 days ago	unknown	unknown
27688	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): coherence statement for `CatPullbackSquare.inverse`	This PR records a "coherence" statement for `CatPullbackSquares`: it bridges the gap between the user-provided `inverse` field of the `CatPullbackSquare` structure, and the other way one can deduce an equivalence between the top left corner of the square and a categorical pullback (via the pseudofunctoriality of categorical pullback squares induced by the identity `CatCospanTransform`). We show the two possible natural isomorphisms on the inverses of the equivalences are in fact the same (hence the term "coherence"). --- - [ ] depends on: #27686 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict blocked-by-other-PR	2351/74	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	4	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-33805 4 days ago	unknown	unknown
27689	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): horizontal pasting calculus for `CatPullbackSquare`	Given two categorical commutative squares that can be horizontally pasted, we prove that if the rightmost square is a `CatPullbackSquare`, then the leftmost square is a `CatPullbackSquare` if and only if the horizontal composition of the squares is a `CatPullbackSquare`. This generalizes to `CatPullbackSquare` the well-known "pasting calculus" for pullback squares in a category. The statement is made available both in terms of the `Type`-class `CatPullbackSquare`, and in terms of the `Prop`-class `IsCatPullbackSquare`. --- - [ ] depends on: #27686 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict blocked-by-other-PR	2562/74	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Pasting.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	5	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-33803 4 days ago	unknown	unknown
27690	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): vertical pasting calculus for `CatPullbackSquare`	We mirror the constructions from #27689 to construct the vertical pasting calculus of `CatPullbackSquares`: given two vertically composable `CatCommSq` such that the bottom one is a `CatPullbackSquare`, the top square is a `CatPullbackSquare` if and only if the vertical composition (the "outer" square) is a `CatPullbackSquare`. --- - [ ] depends on: #27689 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict blocked-by-other-PR	2841/74	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Pasting.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	5	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-33801 4 days ago	unknown	unknown
27740	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): pasting calculus for `CategoricalPullback`	Specialize the pasting calculus for categorical pullback squares to `CategoricalPullback̀` by providing equivalences of categories `R ⊡ (B₁ ⋙ B₂) ≌ (π₂ R B₂) ⊡ B₁` and `(R₁ ⋙ R₂) ⊡ B ≌ R₁ ⊡ (π₁ R₂ B)`. The `@[simps!]` attribute works wonderfully on these equivalences so that their component all have the expected (d)simp lemmas. --- - [ ] depends on: #27690 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict blocked-by-other-PR	2872/75	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Pasting.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	5	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-33800 4 days ago	4-33801 4 days ago	0-1017 16 minutes
29885	xroblot author:xroblot	feat(DedekindDomain): lift a basis in a disjoint extension when the different ideals are coprime	--- - [ ] depends on: #29770	large-import t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	610/44	Mathlib.lean,Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean,Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/RingTheory/Adjoin/PowerBasis.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/LinearDisjoint.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/PowerBasis.lean,Mathlib/RingTheory/Trace/Basic.lean	11	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-32792 4 days ago	4-32793 4 days ago	0-330 5 minutes
30077	agjftucker author:agjftucker	feat(Analysis/Calculus/ImplicitFunOfBivariate): define implicitFunOfBivariate	In this specialization of the implicit function theorem, to an equation involving a curried bivariate function, we make assumptions on each of the partial derivatives individually. Consequently it requires import of results depending on the mean value theorem, and is sequestered to its own file apart from `Implicit.lean`. --- - [ ] depends on: #26985 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis blocked-by-other-PR	264/4	Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean,Mathlib/Analysis/Calculus/Implicit.lean,Mathlib/Analysis/Calculus/ImplicitFunOfBivariate.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-25874 4 days ago	4-26289 4 days ago	0-749 12 minutes
29948	mcdoll author:mcdoll	feat(Analysis/Fourier): The Fourier transform on L^2	--- - [ ] depends on: #29888 - [ ] depends on: #29860 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	600/118	Mathlib.lean,Mathlib/Analysis/Distribution/FourierSchwartz.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Fourier/FourierTransform.lean,Mathlib/Analysis/Fourier/L2Space.lean,Mathlib/Analysis/InnerProductSpace/Extend.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/Normed/Operator/Completeness.lean,Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,docs/undergrad.yaml	11	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-16884 4 days ago	4-16885 4 days ago	0-2667 44 minutes
29517	pechersky author:pechersky	feat(RingTheory/Torsion): torsion = union of roots of unity	with additional API for Associates and rootsOfUnity sups --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #29988 - [x] depends on: #29989 - [ ] depends on: #29990 - [x] depends on: #29991	t-algebra awaiting-author blocked-by-other-PR label:t-algebra$	216/43	Mathlib.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/NumberTheory/Cyclotomic/CyclotomicCharacter.lean,Mathlib/NumberTheory/Cyclotomic/Rat.lean,Mathlib/NumberTheory/MulChar/Lemmas.lean,Mathlib/RingTheory/Frobenius.lean,Mathlib/RingTheory/RootsOfUnity/Basic.lean,Mathlib/RingTheory/RootsOfUnity/EnoughRootsOfUnity.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean,Mathlib/RingTheory/Torsion.lean	11	8	['chrisflav', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	chrisflav assignee:chrisflav	4-3127 4 days ago	4-3253 4 days ago	12-51243 12 days
26942	pechersky author:pechersky	feat(RingTheory/Valuation/ValueGroupIso): isomorphism of value groups when compatible	and also to the ValuativeRel's value group by request from comment in https://github.com/leanprover-community/mathlib4/pull/26754#issuecomment-3051770901 - [ ] depends on: #26588 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #26939 - [x] depends on: #26940 - [x] depends on: #26941	t-ring-theory t-order blocked-by-other-PR	299/3	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/RingTheory/Valuation/ValueGroupIso.lean	6	9	['faenuccio', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	faenuccio assignee:faenuccio	4-992 4 days ago	4-3289 4 days ago	10-67838 10 days
28808	alreadydone author:alreadydone	experiment: Ideal with Mul only (no Semiring)	--- - [ ] depends on: #28807 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	bench-after-CI t-algebra awaiting-CI merge-conflict blocked-by-other-PR label:t-algebra$	172/120	Mathlib/Algebra/Module/Submodule/Defs.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/LinearAlgebra/Matrix/Ideal.lean,Mathlib/LinearAlgebra/TensorProduct/Subalgebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/RingTheory/Ideal/Defs.lean,Mathlib/RingTheory/Ideal/Lattice.lean,Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-83372 3 days ago	3-83372 3 days ago	0-0 0 seconds
29792	robertmaxton42 author:robertmaxton42	feat (RelCWComplex): a (relative, concrete) CW complex is the colimit of its skeleta	Adds: * `RelCWComplex.Subcomplex.isCoherentWith_cover`: a (relative) CW complex is coherent with any collection of subcomplexes that cover. * `RelCWComplex.descBySkeletonLT` and `descBySkeleton`: construct a continuous map from a complex by providing a family of compatible maps from each skeleton and the base. `CWComplex.descBySkeleton` skips the base. - [ ] depends on: #29788 - [ ] depends on: #29790 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	672/31	Mathlib/Data/Set/Subset.lean,Mathlib/Data/Set/UnionLift.lean,Mathlib/Topology/CWComplex/Classical/Basic.lean,Mathlib/Topology/CWComplex/Classical/Finite.lean,Mathlib/Topology/CWComplex/Classical/Subcomplex.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Coherent.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Basic.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'scholzhannah']	nobody	3-48079 3 days ago	15-5414 15 days ago	0-1375 22 minutes
29702	loefflerd author:loefflerd	feat(Topology): arithmetic subgroups of GL(2, R) are discrete	Show that arithmetic subgroups (subgroups of GL2R commensurable with SL2Z) are discrete --- - [x] depends on: #29648 - [x] depends on: #29707 - [ ] depends on: #29743 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR WIP	169/13	Mathlib.lean,Mathlib/Data/Set/Constructions.lean,Mathlib/NumberTheory/ModularForms/ArithmeticSubgroups.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Algebra/IsUniformGroup/DiscreteSubgroup.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/DiscreteSubset.lean	7	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-43753 3 days ago	11-24288 11 days ago	0-2 2 seconds
29774	Raph-DG author:Raph-DG	feat(AlgebraicGeometry): Order of vanishing of elements of the function field of locally noetherian, integral schemes	In this PR, we define the order of vanishing of elements of the function field of locally noetherian, integral schemes at points of codimension 1. This is essentially just a wrapper around the API for the order of vanishing for rings (i.e. Ring.ord and Ring.ordFrac), but I think it's good to have this too for usability. --- - [ ] depends on: #29550 - [ ] depends on: #26735 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed blocked-by-other-PR	770/4	Mathlib.lean,Mathlib/AlgebraicGeometry/OrderOfVanishing.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/Order/KrullDimension.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/OrderOfVanishing/Basic.lean,Mathlib/RingTheory/OrderOfVanishing/Properties.lean,Mathlib/Topology/KrullDimension.lean	8	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-43006 3 days ago	3-43028 3 days ago	0-1197 19 minutes
27679	b-reinke author:b-reinke	feat(GroupTheory/FreeGroup): add pow_left_inj	This PR shows that taking n-th powers is an injective function on the free group, using the theory of cyclical reduction. It is the last part of a series of PR on the theory of cyclically reduced words, that were split from #22639. Upstreamed from the [EquationalTheories](https://github.com/teorth/equational_theories) project. - [ ] depends on: #25966 - [ ] depends on: #27672 - [ ] depends on: #27673 - [ ] depends on: #27678 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory merge-conflict blocked-by-other-PR	364/0	Mathlib.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/FreeGroup/CyclicallyReduced.lean,Mathlib/GroupTheory/FreeGroup/Reduce.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-31727 3 days ago	51-36304 1 month ago	0-2410 40 minutes
27678	b-reinke author:b-reinke	feat(GroupTheory/FreeGroup): reduction theorem for powers	This PR adds the theorem `reduce_flatten_replicate`, it describes the reduction of a power of a reduced word in terms of its cyclic reduction. 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 - [ ] depends on: #27672 - [ ] depends on: #27673 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory merge-conflict blocked-by-other-PR	286/0	Mathlib.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/FreeGroup/CyclicallyReduced.lean,Mathlib/GroupTheory/FreeGroup/Reduce.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-31726 3 days ago	51-36305 1 month ago	0-19 19 seconds
26221	grunweg author:grunweg	Mr. Covariant Derivatives	This PR is a work in progress, and will land in individual pieces. Some contributions include - additional API for differentiability of vector bundle sections - finite sums, differences and scalar products of smooth sections are smooth - the same result for mdifferentiable - add missing mdifferentiable congruence lemmas - define smooth local frames of a vector bundle - a general tensoriality criterion (to be cleaned up!) - define covariant derivatives, proving their tensoriality and that convex combinations of these are covariant derivatives - the classification of covariant derivatives over a trivial bundle - additional API for the Lie bracket of vector fields: the product rule (one sorry left!), Lie bracket at zero vanishes - torsion of a connection, torsion-free connections - Gram-Schmidt procedure for sections of a Riemannian vector bundle - orthonormal frames on a Riemannian vector bundle - connections compatible with a metric; definition of the Levi-Civita connection - in progress: existence and uniqueness of the Levi-Civita connection - custom elaborators for sections in a vector bundle and for differentiability/smoothness in a mathlib (inferring the model with corners) --- experimental More to come soon! Joint work with @PatrickMassot; supported by the FMJH. --- - [x] depends on: #26360 - [x] depends on: #26672 - [x] depends on: #26673 - [x] depends on: #26674 - [x] depends on: #26864 (more of a by-product) - [x] depends on: #26865 - [x] depends on: #26866 - [x] depends on: #26870 - [x] depends on: #26871 - [x] depends on: #26671 - [x] depends on: #26676 - [x] depends on: #26677 - [x] depends on: #26678 - [x] depends on: #26686 - [x] depends on: #26687 - [x] depends on: #26688 - [x] depends on: #26702 - [x] depends on: #26709 - [x] depends on: #26734 - [ ] depends on: #26743 (still WIP) - [x] depends on: #26894 - [x] depends on: #26921 - [x] depends on: #26922 - [x] depends on: #27020 - [ ] depends on: #27021 - [x] depends on: #27023 - [ ] depends on: #27024 - [ ] depends on: #27025 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR	6132/26	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Geometry/Manifold/CheatSheet.md,Mathlib/Geometry/Manifold/Elaborators.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/Geometry/Manifold/Riemannian/ExistsRiemannianMetric.lean,Mathlib/Geometry/Manifold/Traces.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/LeviCivita.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Torsion.lean,Mathlib/Geometry/Manifold/VectorBundle/GramSchmidtOrtho.lean,Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean,Mathlib/Geometry/Manifold/VectorBundle/MDifferentiable.lean,Mathlib/Geometry/Manifold/VectorBundle/Misc.lean,Mathlib/Geometry/Manifold/VectorBundle/OrthonormalFrame.lean,Mathlib/Geometry/Manifold/VectorBundle/SmoothSection.lean,Mathlib/Geometry/Manifold/VectorBundle/Tensoriality.lean,Mathlib/Geometry/Manifold/VectorField/LieBracket.lean,Mathlib/Geometry/Manifold/VectorField/Pullback.lean,MathlibTest/DifferentialGeometry/Elaborators.lean	21	n/a	['github-actions', 'grunweg', 'idontgetoutmuch', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	3-28862 3 days ago	unknown	unknown
30083	grunweg author:grunweg	feat: local frames	TODO: write a detailed description (and update the module doc-string) From the path towards geodesics and the Levi-Civita connection. Co-authored-by: Patrick Massot [patrickmassot@free.fr](mailto:patrickmassot@free.fr) --- - [ ] depends on: #27021 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR	2120/0	Mathlib.lean,Mathlib/Geometry/Manifold/Elaborators.lean,Mathlib/Geometry/Manifold/Traces.lean,Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean,MathlibTest/DifferentialGeometry/Elaborators.lean,scripts/noshake.json	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-28753 3 days ago	3-59641 3 days ago	0-14 14 seconds
27268	wwylele author:wwylele	feat: Hahn embedding theorem	This proves [Hahn embedding theorem](https://en.wikipedia.org/wiki/Hahn_embedding_theorem), one among the 1000+ theorems project. --- This is migrated from #25140 to fork - [ ] depends on: #29275 - [ ] depends on: #30101 - [x] depends on: #26114 - [x] depends on: #27043 - [x] depends on: #29421 - [x] depends on: #29423 - [x] depends on: #29451 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	619/2	Mathlib.lean,Mathlib/Algebra/Order/Group/HahnEmbedding.lean,Mathlib/Algebra/Order/Module/HahnEmbedding.lean,Mathlib/Algebra/Order/Monoid/PNat.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/GroupTheory/DivisibleHull.lean,docs/1000.yaml,docs/references.bib	8	6	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-11723 3 days ago	19-44540 19 days ago	0-910 15 minutes
26579	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Pullbacks/Categorical/CatCospanTransform): equivalences of categorical cospans	Building on the notion of adjunctions of categorical cospans, we define equivalences of categorical cospans as a structure extending that of an adjunction, with the extra data of a chosen inverse of the unit and counit morphisms. To mirror the design for usual equivalences of categories, we provide an alternative constructor that requires the forward and inverse direction of the equivalence, as well as unit and counits already as isomorphisms, and only a proof of the left triangle identity. Finally, we also provide a third constructor that builds such an equivalence out of the data of 3 component equivalences of categories, as well as chosen `CatCommSq` on the functors of the these equivalences. This notion of equivalence of categorical cospans is intended to encode the required data to show the full equivalence invariance of the categorical pullback defined in #26366. --- - [ ] depends on: #26578 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict blocked-by-other-PR	438/0	Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean	1	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-60205 2 days ago	2-60206 2 days ago	0-838 13 minutes
29508	zhuyizheng author:zhuyizheng	feat(MeasureTheory): FTC and integration by parts for absolutely continuous functions	Prove Fundamental Theorem of Calculus and integration by parts for absolutely continuous functions. Part of originally planned #29092. --- - [ ] depends on: #29503 - [ ] depends on: #29507 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict blocked-by-other-PR	1378/0	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/MeasureTheory/Function/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/AbsContFunc.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/DerivIntegrable.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/LebesgueDifferetiationThm.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean	7	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-56934 2 days ago	2-56934 2 days ago	0-0 0 seconds
30110	ADedecker author:ADedecker	feat: IsUniformGroup ↔ IsRightUniformGroup ∧ IsLeftUniformGroup	--- - [ ] depends on: #30029 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	275/36	Mathlib/Topology/Algebra/IsUniformGroup/Basic.lean,Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	2-54334 2 days ago	2-59711 2 days ago	0-357 5 minutes
28796	grunweg author:grunweg	feat: immersions are smooth	The conventional textbook definition demands that an immersion be smooth. When asking for the immersion to have local slice charts (as we do), this implies smoothness automatically. --- - [x] depends on: #28701 - [ ] depends on: #28793 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR WIP	575/1	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,docs/overview.yaml,docs/references.bib	7	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-42885 2 days ago	2-43487 2 days ago	0-1 1 second
30092	grunweg author:grunweg	feat: enable the flexible linter	#28962 but with commits squashed: do not merge! --- - [x] depends on: #30091 - [x] depends on: #30106 - [ ] depends on: #28962 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	307/43	Archive/Arithcc.lean,Archive/Examples/Eisenstein.lean,Archive/Examples/IfNormalization/Result.lean,Archive/Imo/Imo1997Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2019Q4.lean,Archive/Imo/Imo2024Q5.lean,Counterexamples/MapFloor.lean,Mathlib/Algebra/Field/GeomSum.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Homology/Augment.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/LinearRecurrence.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Monoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/Analysis/AbsoluteValue/Equivalence.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Complex/Arg.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/JensenFormula.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/InnerProductSpace/Rayleigh.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/PosPart/Basic.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/IntegralRepresentation.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/Analysis/SpecialFunctions/Log/PosLog.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Complex.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Inverse.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Mate.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Dialectica/Monoidal.lean,Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/CategoryTheory/Limits/Constructions/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Grothendieck.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean,Mathlib/CategoryTheory/Products/Basic.lean,Mathlib/Combinatorics/Additive/Corner/Roth.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/Combinatorics/Additive/SmallTripling.lean,Mathlib/Combinatorics/Additive/VerySmallDoubling.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/Primrec.lean,Mathlib/Computability/TMConfig.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Control/EquivFunctor/Instances.lean,Mathlib/Data/Bool/Count.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Matrix/Basis.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Nat/Digits/Lemmas.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/PEquiv.lean,Mathlib/Data/Rat/Cast/CharZero.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/WSeq/Basic.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/Geometry/Manifold/ContMDiff/Constructions.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/GroupTheory/HNNExtension.lean,Mathlib/GroupTheory/Perm/Fin.lean,Mathlib/Init.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/Logic/Equiv/List.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Real.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Periodic.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Probability.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean	125	12	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	2-42622 2 days ago	3-24703 3 days ago	0-0 0 seconds
28330	joelriou author:joelriou	feat(AlgebraicTopology): the type of non degenerate simplices not in a given subcomplex	--- - [ ] depends on: #28224 - [x] depends on: #27968 - [ ] depends on: #28034 - [ ] depends on: #26076 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology blocked-by-other-PR WIP	303/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplicesSubcomplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/CategoryTheory/EpiMono.lean	6	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-34018 2 days ago	2-34049 2 days ago	0-2 2 seconds
28700	Timeroot author:Timeroot	feat(ModelTheory): Set.Definable is transitive	--- This PR continues the work from #19695. Original PR: https://github.com/leanprover-community/mathlib4/pull/19695 - [ ] depends on: #26332 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-logic blocked-by-other-PR	529/8	Mathlib/Data/Rel.lean,Mathlib/ModelTheory/Definability.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean,scripts/noshake.json	5	6	['Timeroot', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'staroperator']	nobody	2-30885 2 days ago	2-30910 2 days ago	3-12935 3 days
27606	CBirkbeck author:CBirkbeck	Eisenstein q exp identity	--- - [x] depends on: #26016 - [x] depends on: #27212 - [x] depends on: #27837 - [x] depends on: #27839 - [x] depends on: #27840 - [x] depends on: #28690 - [ ] depends on: #27838 - [ ] depends on: #27841 - [ ] depends on: #27844 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR	824/13	Mathlib.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/IntegerCompl.lean,Mathlib/Analysis/Complex/Norm.lean,Mathlib/Analysis/Complex/SummableUniformlyOn.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/LSeries/RiemannZeta.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Defs.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Summable.lean,Mathlib/NumberTheory/TsumDivsorsAntidiagonal.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean	19	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-64019 1 day ago	31-17013 1 month ago	0-0 0 seconds
23040	grunweg author:grunweg	feat: define immersions and smooth embeddings in infinite dimensions	Sadly, we cannot prove most nice things about them yet, as we don't have the inverse function theorem yet. TODO: prove the few things we can already say --- - [ ] depends on: #28796 - [ ] depends on: #28853 - [x] depends on: #23175 (preliminaries) - [x] depends on: #23186 - [ ] depends on: another PR, about `MSplitAt` (to be filed) - and perhaps some prerequisites about products of complemented modules etc. - [x] depends on: #23219 (preliminaries about local diffeomorphisms) - [ ] depends on: #8738 - in fact, #9273 is not a strict pre-requisite for this. It suffices to know "extended charts have invertible differentials", which [isInvertible_mfderiv_extChartAt](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Geometry/Manifold/MFDeriv/Atlas.html#isInvertible_mfderiv_extChartAt) mostly proves. (There's nothing wrong with completing that PR, for all interior points.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	967/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MSplits.lean	5	4	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	1-63859 1 day ago	1-66468 1 day ago	0-0 0 seconds
27634	agjftucker author:agjftucker	fix(Analysis/Calculus/Implicit): consistently rename {`map`, `fun`, `function`} to `fun`	There are several clear naming issues in the file Implicit.lean, such as ``` theorem prod_map_implicitFunction : ∀ᶠ p : F × G in 𝓝 (φ.prodFun φ.pt), φ.prodFun (φ.implicitFunction p.1 p.2) = p := ``` where `prod_map` and `prodFun` both refer to the same thing. In this PR I have done my best to resolve these as consistently as possible by renaming everything `map`, also everything `function`, to `fun`. This has the added benefit of making some long names a little shorter. In passing I rewrapped some comments and replaced `haveI` with `have` where it had been used like `haveI` in Lean 3. Moves: - ImplicitFunctionData -> ImplicitFunData - ImplicitFunctionData.implicitFunction -> ImplicitFunData.implicitFun - ImplicitFunctionData.prod_map_implicitFunction -> ImplicitFunData.prodFun_implicitFun - ImplicitFunctionData.left_map_implicitFunction -> ImplicitFunData.leftFun_implicitFun - ImplicitFunctionData.right_map_implicitFunction -> ImplicitFunData.rightFun_implicitFun - ImplicitFunctionData.implicitFunction_apply_image -> ImplicitFunData.implicitFun_apply_image - ImplicitFunctionData.implicitFunction_hasStrictFDerivAt -> ImplicitFunData.hasStrictFDerivAt_implicitFun - HasStrictFDerivAt.implicitFunctionDataOfComplemented -> HasStrictFDerivAt.implicitFunDataOfComplemented - HasStrictFDerivAt.implicitFunctionOfComplemented -> HasStrictFDerivAt.implicitFunOfComplemented - HasStrictFDerivAt.map_implicitFunctionOfComplemented_eq -> HasStrictFDerivAt.map_implicitFunOfComplemented_eq - HasStrictFDerivAt.eq_implicitFunctionOfComplemented -> HasStrictFDerivAt.eq_implicitFunOfComplemented - HasStrictFDerivAt.implicitFunctionOfComplemented_apply_image -> HasStrictFDerivAt.implicitFunOfComplemented_apply_image - HasStrictFDerivAt.to_implicitFunctionOfComplemented -> HasStrictFDerivAt.to_implicitFunOfComplemented - HasStrictFDerivAt.implicitFunction -> HasStrictFDerivAt.implicitFun - HasStrictFDerivAt.tendsto_implicitFunction -> HasStrictFDerivAt.tendsto_implicitFun - _root_.Filter.Tendsto.implicitFunction -> _root_.Filter.Tendsto.implicitFun - HasStrictFDerivAt.map_implicitFunction_eq -> HasStrictFDerivAt.map_implicitFun_eq - HasStrictFDerivAt.implicitFunction_apply_image -> HasStrictFDerivAt.implicitFun_apply_image - HasStrictFDerivAt.eq_implicitFunction -> HasStrictFDerivAt.eq_implicitFun - HasStrictFDerivAt.to_implicitFunction -> HasStrictFDerivAt.to_implicitFun --- - [ ] depends on: #26985 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict blocked-by-other-PR	271/123	Mathlib/Analysis/Calculus/Implicit.lean,docs/1000.yaml,docs/overview.yaml,docs/undergrad.yaml	4	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-55962 1 day ago	1-55963 1 day ago	23-28425 23 days
28853	grunweg author:grunweg	feat: product of immersions is an immersion	--- - [ ] depends on: #28793 - [x] depends on: #28840 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict blocked-by-other-PR	511/0	Mathlib.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Topology/PartialHomeomorph.lean,docs/references.bib	6	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-55716 1 day ago	1-55717 1 day ago	0-1911 31 minutes
29481	llllvvuu author:llllvvuu	feat(LinearAlgebra/Eigenspace): roots of matrix minpoly give spectrum	This is derived from the corresponding result on linear maps. --- - [ ] depends on: #29478 for some simp lemmas [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	28/0	Mathlib/LinearAlgebra/Eigenspace/Minpoly.lean	1	4	['github-actions', 'llllvvuu', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-55590 1 day ago	1-55591 1 day ago	0-0 0 seconds
30112	gaetanserre author:gaetanserre	feat(Probability.Kernel): add representation of kernel as a map of a uniform measure	Add results about isolation of kernels randomness. In particular, it shows that one can write a Markov kernel as the map by a deterministic of a uniform measure on `[0, 1]`. It corresponds to Lemma 4.22 in "[Foundations of Modern Probability](https://link.springer.com/book/10.1007/978-3-030-61871-1)" by Olav Kallenberg, 2021. --- I'm not 100% convinced by either the names of the entries or their placement. I imagine @RemyDegenne will have something to say about this. - [ ] depends on: #27516 For a rational approximation characterization of suprema in the unit interval [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability blocked-by-other-PR	172/0	Mathlib.lean,Mathlib/MeasureTheory/Constructions/UnitInterval.lean,Mathlib/Probability/Kernel/Representation.lean,Mathlib/Topology/UnitInterval.lean	4	4	['RemyDegenne', 'gaetanserre', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-47567 1 day ago	2-50154 2 days ago	0-318 5 minutes
29903	joelriou author:joelriou	chore(CategoryTheory): split Limits.Presentation	The part of the code involving "set theory" (via finitely presentable objects) is moved to `CategoryTheory.Presentable.Presentation`. As `ColimitPresentation` is going to be used more widely, this will reduce dependencies to set theory for some files. - [ ] depends on: #29851 - [x] depends on: #29849 - [x] depends on: #29843 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	295/138	Mathlib.lean,Mathlib/CategoryTheory/Limits/Presentation.lean,Mathlib/CategoryTheory/ObjectProperty/ColimitsOfShape.lean,Mathlib/CategoryTheory/ObjectProperty/Ind.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsOfShape.lean,Mathlib/CategoryTheory/Presentable/ColimitPresentation.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-42207 1 day ago	1-42228 1 day ago	0-2 2 seconds
27366	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupCohomology/Hilbert90): add Hilbert 90 for cyclic groups	Let `L/K` be a finite extension of fields. Before this PR, this file proves Noether's generalization of Hilbert's Theorem 90: that the 1st group cohomology $H^1(Aut_K(L), L^\times)$ is trivial. Hilbert's original statement was that if $L/K$ is Galois, and $Gal(L/K)$ is cyclic, generated by an element `σ`, then for every `x : L` such that $N_{L/K}(x) = 1,$ there exists `y : L` such that $x = y/σ(y).$ We prove that in this PR, using the fact that `H¹(G, A) ≅ Ker(N_A)/(ρ(g) - 1)(A)` for any finite cyclic group `G` with generator `g`, and then applying Noether's generalization. --- - [x] depends on: #27361 - [x] depends on: #27362 - [x] depends on: #27363 - [ ] depends on: #27364 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	417/8	Mathlib.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/RepresentationTheory/Homological/FiniteCyclic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/FiniteCyclic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	8	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-38920 1 day ago	41-38819 1 month ago	0-351 5 minutes
26831	AntoineChambert-Loir author:AntoineChambert-Loir	feat(GroupTheory/SpecificGroups/Alternating/MaximalSubgroups): maximal subgroups of the alternating group	This proves the first case (intransitive) of the O'Nan-Scott classification of maximal subgroups of the alternating group. --- - [ ] depends on: #26457 - [ ] depends on: #26282 - [x] depends on: #26281 - [x] depends on: #26280 - [x] depends on: #26279 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory large-import blocked-by-other-PR	2061/146	Mathlib.lean,Mathlib/Data/Set/Card.lean,Mathlib/GroupTheory/GroupAction/FixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/Jordan.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/Primitive.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/GroupTheory/Perm/MaximalSubgroups.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/SpecificGroups/Alternating/MaximalSubgroups.lean,Mathlib/SetTheory/Cardinal/Embedding.lean,docs/references.bib	16	n/a	['AntoineChambert-Loir', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-38355 1 day ago	unknown	unknown
26457	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Mathlib/GroupTheory/Perm/MaximalSubgroups): maximal subgroups of the permutation group	* `Equiv.Perm.isCoatom_stabilizer`: when `s : Set α` is not empty, nor its complementary subset, and if the cardinality of `s` is not half of that of `α`, then `MulAction.stabilizer (Equiv.Perm α) s` is a maximal subgroup of the symmetric group `Equiv.Perm α`. This is the intransitive case of the O'Nan-Scott classification. ## TODO * Appplication to primitivity of the action of `Equiv.Perm α` on finite combinations of `α`. * Finish the classification --- - [ ] depends on: #26282 - [x] depends on: #26281 - [x] depends on: #26280 - [x] depends on: #26279 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory large-import blocked-by-other-PR	1454/138	Mathlib.lean,Mathlib/Data/Set/Card.lean,Mathlib/GroupTheory/GroupAction/FixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/Jordan.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/Primitive.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/GroupTheory/Perm/MaximalSubgroups.lean,Mathlib/SetTheory/Cardinal/Embedding.lean,docs/references.bib	14	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-38342 1 day ago	unknown	unknown
29881	joelriou author:joelriou	refactor(CategoryTheory/ObjectProperty): IsClosedUnderLimitsOfShape	WIP. Rename `ClosedUnderLimitsOfShape` as `ObjectProperty.IsClosedUnderLimitsOfShape`, and make it a typeclass. --- - [ ] depends on: #29903 - [ ] depends on: #29851 - [x] depends on: #29843 - [x] depends on: #29849 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	552/304	Mathlib.lean,Mathlib/CategoryTheory/Limits/FullSubcategory.lean,Mathlib/CategoryTheory/Limits/Indization/Category.lean,Mathlib/CategoryTheory/Limits/Indization/Equalizers.lean,Mathlib/CategoryTheory/Limits/MorphismProperty.lean,Mathlib/CategoryTheory/Limits/Presentation.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/ObjectProperty/ColimitsOfShape.lean,Mathlib/CategoryTheory/ObjectProperty/Ind.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsOfShape.lean,Mathlib/CategoryTheory/Presentable/ColimitPresentation.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean	12	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-26961 1 day ago	1-28907 1 day ago	0-1 1 second
28244	robin-carlier author:robin-carlier	feat(CategoryTheory/Bicategory/NaturalTransformation): Icons	We define icons (short for Identity Component Oplax Natural transformations) between lax functors in bicategories. Such transformations bundle an oplax natural transformation, along with the assertion that the source and target functor agree on objects, and the fact that the app-component of the underlying natural transformation is the `eqToHom` morphism along that equality. We define vertical composition of such natural transformations. Strict associativity and strict unitality of the composition of icons will be the content of a follow-up PR. In future work, icons will constitute the 2-cells of a strict bicategory structure on bicategories, with 1-cells (strictly unitary) pseudofunctors. This bicategory structure will define a category structure on strictly unitary pseudofunctors from `LocallyDiscrete (Fin n)` to a bicategory `C` (i.e "pseudo-composable arrows" in `C`), which will be part of the definition of the 2-nerve of `C`, which is a simplicial category that encodes higher compositions within a bicategory `C`. --- - [ ] depends on: #25825 - [ ] depends on: #28243 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory awaiting-CI merge-conflict blocked-by-other-PR WIP	816/33	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/EqToHom.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Icon.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Lax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Strict.lean,Mathlib/CategoryTheory/EqToHom.lean,scripts/noshake.json	8	4	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-25078 1 day ago	1-25079 1 day ago	0-1160 19 minutes
28245	robin-carlier author:robin-carlier	feat(CategoryTheory/Bicategory/NaturalTransformation/Icon): strict associativity and unitality of icon composition	We show that the vertical composition of icons defined in #28244 satisfies strict associativity and strict unitality. This morally shows that icons are fit as the 2-cells of a bicategory structure on bicategories and lax functors, though we do not record an instance of this sort. --- - [ ] depends on: #28244 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory awaiting-CI merge-conflict blocked-by-other-PR WIP	975/33	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/EqToHom.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Icon.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Lax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Strict.lean,Mathlib/CategoryTheory/EqToHom.lean,scripts/noshake.json	8	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-25077 1 day ago	1-25077 1 day ago	0-537 8 minutes
28893	joelriou author:joelriou	refactor(AlgebraicTopology): redefine the topological simplex using the convexity API	Before this PR, the n-dimensional topological simplex (in the `AlgebraicTopology` hierarchy) was defined as a subtype of `Fin (n + 1) → ℝ≥0`, which did not interact well with the convexity API which assumes the ambient type is a vector space. In this PR, we redefine the topological simplex functor (as a cosimplicial object in `TopCat`) using the already existing `stdSimplex` from `Analysis.Convex`. --- - [ ] depends on: #28891 - [x] depends on: #28869 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology t-convex-geometry large-import blocked-by-other-PR	283/109	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SingularSet.lean,Mathlib/AlgebraicTopology/TopologicalSimplex.lean,Mathlib/Analysis/Convex/StdSimplex.lean,Mathlib/LinearAlgebra/Finsupp/Pi.lean,Mathlib/Topology/Algebra/Monoid/FunOnFinite.lean	7	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-23503 1 day ago	34-37532 1 month ago *	0-2609 43 minutes *
30129	vlad902 author:vlad902	feat(SimpleGraph): define and prove basic theory of vertex covers	Define a predicate `IsVertexCover G C` to state that `C` is a vertex cover of `G`. Furthermore, `G.minVertexCover` is the cardinality of the minimum vertex cover of G. Then prove the basic theory of how these definitions relate to the empty and complete graphs and their relationship with graph homs/isos. - [ ] depends on: #29833 - [ ] depends on: #30136 - [ ] depends on: #30137 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	198/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/VertexCover.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-22588 1 day ago	1-39096 1 day ago	0-1068 17 minutes
30053	vlad902 author:vlad902	feat(SimpleGraph): only the complete graph has chromatic number equal to its cardinality	Prove that only the (finite) complete graph has chromatic number equal to its cardinality, thereby finishing an iff fully characterizing graphs with chromatic number equal to their cardinality. - [ ] depends on: #30136 - [ ] depends on: #30137 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	49/0	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean	2	6	['eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'vlad902']	nobody	1-22577 1 day ago	1-22579 1 day ago	4-13647 4 days
29579	vlad902 author:vlad902	feat(SimpleGraph): characterize graphs with chromatic number 1 or 2	- [ ] depends on: #29578 - [ ] depends on: #30136	t-combinatorics blocked-by-other-PR	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	1-22528 1 day ago	1-22529 1 day ago	15-56462 15 days
26212	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): the Rees theorem for depth	In this PR we proved the Rees theorem for depth. Co-authored-by: Hu Yongle --- - [ ] depends on: #27416 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	409/22	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	9	n/a	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-3406 1 day ago	unknown	unknown
26213	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Ext iso quotient regular sequence	In this PR defined the `addequiv` between `Ext M N k` and `N =>[R] M/ rs * M` where `rs` is a regular sequence of length `k` Co-authored-by: Hu Yongle Co-authored-by: Wang Jingting --- - [ ] depends on: #26212 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	470/22	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	9	n/a	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-3224 1 day ago	unknown	unknown
26214	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): definition of depth	In this PR, we defined the depth of two modules as the minimal order of nonvanishing `Ext` and the `I-depth` for ideal `I` and some basic properties. Including the equivalence of the two in the condition of rees theorem. --- - [ ] depends on: #26212 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	829/22	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	9	n/a	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-1823 1 day ago	unknown	unknown
26215	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Auslander–Buchsbaum theorem	This PR mainly proved the Auslander-Buchsbaum theorem stating for a noetherian local ring `R` and a finitely generated `R` module `M` , `proj.dim(M) + depth(M) = depth(R)`. Co-authored-by: Yongle Hu --- - [ ] depends on: #26214 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	1314/22	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	10	n/a	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-1786 1 day ago	unknown	unknown
26216	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): depth of QuotSMulTop	In this PR, we proved for a local ring `R` and a finitely generated `R` module `M N`, `IsSMulRegular M x` and `x ∈ Module.annihilator R N`, then `depth(N, M/xM) + 1 = depth(N, M)`, and its corollary for quotient regular seqence. --- - [ ] depends on: #26214 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	1132/22	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	9	n/a	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-1775 1 day ago	unknown	unknown
26217	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Ischebeck theorem	This PR mainly proved the Ischbecke theorem, stating that `depth(N,M)` is greater or equal to `depth(M) - dim(N)` for finitely generated module `N, M` over local ring. --- - [ ] depends on: #26214 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	1150/22	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean	10	n/a	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-1731 1 day ago	unknown	unknown
26218	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): definition of cohen macaulay	In this PR, we added the definition of CM module, CM local ring (extending local ring), and CM ring. We also proved Theorem 30, Chater 6, _Commutative Algebra_, Matsumura. --- - [ ] depends on: #26219 - [ ] depends on: #26217 - [ ] depends on: #26216 - [ ] depends on: #28582 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	2365/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/Support.lean	20	n/a	['Thmoas-Guan', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-1452 1 day ago	unknown	unknown
26245	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): cohen macaulay local ring is catenary	We prove Cohen Macaulay local ring is catenary. Following Theorem 31, Chater 6, _Commutative Algebra_, Matsumura --- - [ ] depends on: #26218 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR WIP label:t-algebra$	2757/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Catenary.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/Support.lean	21	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-1044 1 day ago	unknown	unknown
26957	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): unmixed thm of Cohen-Macaulay ring	In this PR we proved for a (comm)ring `R`, `R` is Cohen-Macaulay ring iff the unmixed theorem holds (for every ideal `I` of height `r` generated by `r` elements, all associated primes of `R/I` have height `r` ) --- - [ ] depends on: #26245 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	2933/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Catenary.lean,Mathlib/RingTheory/CohenMacaulay/Unmixed.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/Support.lean	22	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-981 1 day ago	unknown	unknown
29937	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): `ringKrullDim` of quotient via supportDim	In this PR, we establish some lemma about `ringKrullDim` of quotient via lemmas of `supportDim`. Co-authored-by: Yongle Hu @mbkybky --- - [ ] depends on: #26219 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	297/15	Mathlib.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Support.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-735 1 day ago	9-46015 9 days ago	0-2070 34 minutes
28683	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory) : regular local ring is domain	In this PR, we proved for a regular local ring `R`, 1 : for a finite set `S` in the maximal Ideal of `R`, it can be extended to a regular system of parameters iff they are linear independent in the cotangent space iff `R/span S` is regular local ring of dimesion `dim R - \|S\|` 2 : is domain 3 : regular system of parameter form regular sequence. --- - [ ] depends on: #28682 - [ ] depends on: #28582 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR WIP	472/0	Mathlib.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean	4	3	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-601 1 day ago	44-64149 1 month ago	0-111 1 minute
28684	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory) : definition of regular ring	In this PR, we define regular ring as every localization is regular local ring, and proved polynomial over regular ring is regular. --- - [ ] depends on: #28682 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR WIP	158/0	Mathlib.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean	3	3	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-378 1 day ago	44-64150 1 month ago	0-153 2 minutes
29701	Thmoas-Guan author:Thmoas-Guan	feat(Algebra/RingTheory): polynomial over regular ring	In this PR, we proved that polynomial over regular ring is regular. --- - [ ] depends on: #28684 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	326/0	Mathlib.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Polynomial.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-293 1 day ago	17-64128 17 days ago	0-10179 2 hours
29670	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): projective dimension equal supremum of localized module	In this PR, we proved that for a finitely generated module `M` over a noetherian ring `R`, `projdim_R(M)` is equal to the supremum `projdim (M_p)` (viewed as `R_p` module) as `p` run over all prime/maximal ideals. We also proved that the global dimension of `R` is equal to the supremeum of global dimension of `R_p` as p run over all prime/maximal ideals. --- - [ ] depends on: #29558 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	564/0	Mathlib.lean,Mathlib/RingTheory/GlobalDimension.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-85832 23 hours ago	9-49940 9 days ago	0-56 56 seconds
29533	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): maximal Cohen Macaulay module	In this PR, we defined the concept of maximal Cohen Macaulay module, and proved that finitely generated maximal Cohen Macaulay module over regular local ring is free. --- - [ ] depends on: #28683 - [ ] depends on: #26218 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	3001/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/Support.lean	23	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-85165 23 hours ago	23-2842 23 days ago *	0-88 1 minute *
29557	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): finite projective dimension of regular	In this PR, we proved every finitely generated module over regular local ring has finite projective dimension. With this and Auslander Buchsbaum theorem, we can obtain the global dimension of regular local ring is equal to its krull dimension. --- - [ ] depends on: #29533 - [ ] depends on: #26215 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	3572/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/Support.lean	25	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-85124 23 hours ago	unknown	unknown
29534	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): global dimension of regular local ring	In this PR, we proved the global dimension of regular local ring is equal to its krull dimension via Auslander Buchsbaum theorem. --- - [ ] depends on: #29557 - [ ] depends on: #26215 - [ ] depends on: #29558 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	3832/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/Support.lean	26	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-84931 23 hours ago	unknown	unknown
29703	Thmoas-Guan author:Thmoas-Guan	feat(Algebra/RingTheory): Hilbert's Syzygy theorem (projective version)	In this PR, we proved for field `k`, `MvPolynomial (Fin n) k` has global dimension `n`. --- - [ ] depends on: #29701 - [ ] depends on: #29699 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	4532/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Polynomial.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Syzygy.lean,Mathlib/RingTheory/Support.lean	30	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-84615 23 hours ago	unknown	unknown
29699	Thmoas-Guan author:Thmoas-Guan	feat(Algebra/RingTheory) : Global dimension of regular ring	In this PR, we proved that the global (homological dimension) of regular ring is equal to its krull dimension. --- - [ ] depends on: #28684 - [ ] depends on: #29670 - [ ] depends on: #29534 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	4285/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/GlobalDimension.lean,Mathlib/RingTheory/Support.lean	28	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-83753 23 hours ago	unknown	unknown
29796	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory) : regular of finite global dimension	In this PR, we proved the other half of Auslander-Buchsbaum-Serre criterion, which states that a local ring is regular if it has finite global dimension, with results in #29557, we can obtain the full theorem. More APIs would be developed based on the two. --- - [ ] depends on: #26215 - [ ] depends on: #26217 - [ ] depends on: #29558 - [ ] depends on: #28683 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	3009/22	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/AuslanderBuchsbaumSerre.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean	16	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-83577 23 hours ago	unknown	unknown
29802	Thmoas-Guan author:Thmoas-Guan	feat(Algebra/RingTheory) : Auslander–Buchsbaum–Serre criterion and its corollaries	In this PR, we proved that: 1: The full version of Auslander–Buchsbaum–Serre criterion 2: Localization of regular local ring is regular 3: Global dimension finite implies regular (doesn't need local) 4: Regular ring only need to be verified at maximal ideals. --- - [ ] depends on: #29534 - [ ] depends on: #29699 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	5085/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/AuslanderBuchsbaumSerre.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/Localization.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Localization.lean,Mathlib/RingTheory/Support.lean	31	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-83555 23 hours ago	unknown	unknown
28718	imbrem author:imbrem	Added chosen finite coproducts	Added basic `ChosenFiniteCoproducts` class, and started porting some of the lemmas about `ChosenFiniteProducts` suitably translated --- This, combined with #20182 modified to use chosen finite coproducts and premonoidal categories (#21488), should be enough for me to formalize strong Elgot categories, and hence a lot of categorical iteration theory for my PhD thesis. Re-done from #21603 to deal with changes in #24399 and #24390 Eventually, if we really want to harmonize approaches, we could introduce an `AddMonoidalCategory` struct and do the analogous to #24399 and #24390 for additive monoidal structure, but that seems like a massive overcomplication for now. It would allow formalizing fun things like rig categories, though. - [ ] depends on: #30150	new-contributor t-category-theory awaiting-author blocked-by-other-PR	290/0	Mathlib.lean,Mathlib/CategoryTheory/ChosenFiniteCoproducts.lean	2	8	['YaelDillies', 'github-actions', 'imbrem', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	0-65678 18 hours ago	0-65679 18 hours ago	0-24930 6 hours
28468	alreadydone author:alreadydone	feat(Algebra): ring API for `AddLocalization`	Extract `Submonoid.IsLocalizationMap` from `LocalizationMap` and use it in `IsLocalization`. Develop basic API for AddLocalization at a two-sided ideal; in the case of the top AddSubmonoid, show the localization has a Ring structure (Grothendieck ring). Show that a commuative semiring with cancellative addition satisfies the strong rank condition. --- - [x] depends on: #27842 - [x] depends on: #27862 - [ ] depends on: #29596 - [x] depends on: #29597 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author blocked-by-other-PR label:t-algebra$	1000/120	Mathlib.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/Algebra/Order/Nonneg/Basic.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Ring/Invertible.lean,Mathlib/GroupTheory/MonoidLocalization/Archimedean.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/Lemmas.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Localization/Additive.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean,Mathlib/RingTheory/Localization/StrongRankCondition.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean	17	6	['alreadydone', 'chrisflav', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	0-46903 13 hours ago	20-81816 20 days ago	17-3113 17 days
23177	faenuccio author:faenuccio	feat: more lemmas about ordered groups with zero	We add some order properties (mainly some `lt`) for types of the form `WithZero α`. Co-authored-by: María Inés de Frutos Fernández --- - [x] depends on: #26665 - [x] depends on: #26724 - [x] depends on: #26761 - [x] depends on: #26762 - [x] depends on: #26763 - [ ] depends on: #26777	large-import t-order awaiting-CI blocked-by-other-PR WIP	13/1	Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean	1	46	['Vierkantor', 'YaelDillies', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-45760 12 hours ago	19-40436 19 days ago	5-22106 5 days
29854	joelriou author:joelriou	feat(CategoryTheory/ObjectProperty): closure of a property under certain limits	In this PR, given a property `P` of objects in a category `C` and family of categories `J : α → Type _`, we introduce the closure `P.limitsClosure J` of `P` under limits of shapes `J a` for all `a : α`, and under certain smallness circumstances, we show that its essentially small. - [ ] depends on: #29851 - [ ] depends on: #29881 - [ ] depends on: #29903 - [x] depends on: #29849 - [x] depends on: #29843 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	945/304	Mathlib.lean,Mathlib/CategoryTheory/Limits/FullSubcategory.lean,Mathlib/CategoryTheory/Limits/Indization/Category.lean,Mathlib/CategoryTheory/Limits/Indization/Equalizers.lean,Mathlib/CategoryTheory/Limits/MorphismProperty.lean,Mathlib/CategoryTheory/Limits/Presentation.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/ObjectProperty/ClosedUnderIsomorphisms.lean,Mathlib/CategoryTheory/ObjectProperty/ColimitsOfShape.lean,Mathlib/CategoryTheory/ObjectProperty/CompleteLattice.lean,Mathlib/CategoryTheory/ObjectProperty/Ind.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsClosure.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsOfShape.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean,Mathlib/CategoryTheory/Presentable/ColimitPresentation.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean	16	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-45509 12 hours ago	1-24262 1 day ago	0-1 1 second
30160	joelriou author:joelriou	feat(CategoryTheory/ObjectProperty): closure of a property under certain colimits	In this PR, we dualize a few notions about `ObjectProperty` and we use this to dualize the main result about limits in #29854 for colimits: given a property `P` of objects in a category `C` and family of categories `J : α → Type _`, we introduce the closure `P.colimitsClosure J` of `P` under colimits of shapes `J a` for all `a : α`, and under certain smallness circumstances, we show that its essentially small. --- - [ ] depends on: #29851 - [ ] depends on: #29881 - [ ] depends on: #29903 - [ ] depends on: #29854 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	1370/305	Mathlib.lean,Mathlib/CategoryTheory/Limits/FullSubcategory.lean,Mathlib/CategoryTheory/Limits/Indization/Category.lean,Mathlib/CategoryTheory/Limits/Indization/Equalizers.lean,Mathlib/CategoryTheory/Limits/MorphismProperty.lean,Mathlib/CategoryTheory/Limits/Presentation.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/ObjectProperty/ClosedUnderIsomorphisms.lean,Mathlib/CategoryTheory/ObjectProperty/ColimitsClosure.lean,Mathlib/CategoryTheory/ObjectProperty/ColimitsOfShape.lean,Mathlib/CategoryTheory/ObjectProperty/CompleteLattice.lean,Mathlib/CategoryTheory/ObjectProperty/Ind.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsClosure.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsOfShape.lean,Mathlib/CategoryTheory/ObjectProperty/Opposite.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean,Mathlib/CategoryTheory/Presentable/ColimitPresentation.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean	18	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-45281 12 hours ago	0-53507 14 hours ago	0-1 1 second
26291	RemyDegenne author:RemyDegenne	feat(Probability): Fernique's theorem and Cameron-Martin theorem	- invariance by rotation of Gaussian measures - Fernique's theorem - Corollary: the identity is in Lp for all finite p - Definition of the Cameron-Martin space of a Gaussian measure - The Cameron-Martin theorem: shifting a Gaussian measure by an element of the Cameron-Martin space gives an equivalent measure, and shifting by an element which is not in the Cameron-Martin space gives a mutually singular measure. --- - [x] depends on: #24975 - [x] depends on: #24969 - [x] depends on: #24930 - [x] depends on: #24925 - [x] depends on: #24900 - [x] depends on: #25532 - [x] depends on: #27022 - [x] depends on: #27027 - [x] depends on: #27029 - [x] depends on: #27123 - [x] depends on: #27610 - [x] depends on: #28342 - [x] depends on: #28343 - [ ] depends on: #30167 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24430. Original PR: https://github.com/leanprover-community/mathlib4/pull/24430	t-measure-probability blocked-by-other-PR WIP	2059/5	Mathlib.lean,Mathlib/MeasureTheory/Measure/Portmanteau.lean,Mathlib/Probability/Distributions/Gaussian/Basic.lean,Mathlib/Probability/Distributions/Gaussian/CameronMartin.lean,Mathlib/Probability/Distributions/Gaussian/CameronMartinThm.lean,Mathlib/Probability/Distributions/Gaussian/Fernique.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Probability/Moments/CovarianceBilin.lean,Mathlib/Probability/Moments/Variance.lean,Mathlib/Topology/MetricSpace/ThickenedIndicator.lean,docs/1000.yaml	11	6	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-43947 12 hours ago	0-43950 12 hours ago	0-2 2 seconds
30168	joelriou author:joelriou	feat(CategoryTheory): closure under bounded colimits	In this PR, given `P : ObjectProperty C` and `κ : Cardinal.{w}`, we introduce the closure `P.colimitsCardinalClosure κ` of `P` under colimits of shapes given by categories `J` such that `HasCardinalLT (Arrow J) κ` holds. If `C` is locally `w`-small and `P` is essentially `w`-small, we show that this closure `P.colimitsCardinalClosure κ` is also essentially `w`-small. (In particular, if `κ = ℵ₀`, this is the closure of `P` under finite colimits.) --- - [ ] depends on: #29851 - [ ] depends on: #29881 - [ ] depends on: #29903 - [ ] depends on: #29854 - [ ] depends on: #30160 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	1495/307	Mathlib.lean,Mathlib/CategoryTheory/Limits/FullSubcategory.lean,Mathlib/CategoryTheory/Limits/Indization/Category.lean,Mathlib/CategoryTheory/Limits/Indization/Equalizers.lean,Mathlib/CategoryTheory/Limits/MorphismProperty.lean,Mathlib/CategoryTheory/Limits/Presentation.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/ObjectProperty/ClosedUnderIsomorphisms.lean,Mathlib/CategoryTheory/ObjectProperty/ColimitsCardinalClosure.lean,Mathlib/CategoryTheory/ObjectProperty/ColimitsClosure.lean,Mathlib/CategoryTheory/ObjectProperty/ColimitsOfShape.lean,Mathlib/CategoryTheory/ObjectProperty/CompleteLattice.lean,Mathlib/CategoryTheory/ObjectProperty/Ind.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsClosure.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsOfShape.lean,Mathlib/CategoryTheory/ObjectProperty/Opposite.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean,Mathlib/CategoryTheory/Presentable/ColimitPresentation.lean,Mathlib/CategoryTheory/SmallRepresentatives.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean	20	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-37247 10 hours ago	0-38120 10 hours ago	0-1 1 second
29378	mans0954 author:mans0954	feature(Analysis/LocallyConvex/AbsConvex): Balanced and AbsConvex sets under linear maps	Provide `Balanced` and `AbsConvex` versions of `Convex.linear_image`, `Convex.linear_preimage` and the `is_linear` equivalents. --- - [ ] depends on: #29342 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis blocked-by-other-PR	133/68	Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/AbsConvexOpen.lean,Mathlib/Analysis/LocallyConvex/BalancedCoreHull.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/Normed/Module/Dual.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-36356 10 hours ago	1-23971 1 day ago	0-424 7 minutes
29387	mans0954 author:mans0954	feature(Analysis/LocallyConvex/WeakSpace): toWeakSpace_closedAbsConvexHull_eq	The closed absolutely convex hull taken in the weak topology coincides with the closed absolutely convex hull taken in the original topology. --- - [ ] depends on: #29378 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis blocked-by-other-PR	133/68	Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/AbsConvexOpen.lean,Mathlib/Analysis/LocallyConvex/BalancedCoreHull.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/Normed/Module/Dual.lean	6	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-33645 9 hours ago	0-36242 10 hours ago	0-2474 41 minutes
29819	mcdoll author:mcdoll	feat(Analysis/Distribution): Tempered distributions	--- This is mainly a tracking PR: Most features will be PR'd separately. - [x] depends on: #29818 - [x] depends on: #29821 - [x] depends on: #29846 - [ ] depends on: #29860 - [ ] depends on: #30174 - [ ] depends on: #30175 - [ ] depends on: #30176 - [ ] depends on: #30180 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict blocked-by-other-PR WIP	770/21	Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Distribution/FourierMultiplier.lean,Mathlib/Analysis/Distribution/FourierSchwartz.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-29712 8 hours ago	3-18815 3 days ago	0-2 2 seconds
30177	joelriou author:joelriou	feat(CategoryTheory): prestacks	Let `C` be a category and `F : Pseudofunctor (LocallyDiscrete Cᵒᵖ) Cat`. Given `S : C`, and objects `M` and `N` in `F.obj (.mk (op S))`, we define a presheaf of types `F.presheafHom M N` on the category `Over S`: its sections on a object `T : Over S` corresponding to a morphism `p : X ⟶ S` are the type of morphisms `p^* M ⟶ p^* N`. We shall say that `F` satisfies the descent of morphisms for a Grothendieck topology `J` (i.e. `F` is a prestack) if these presheaves are all sheaves (typeclass `F.HasDescentOfMorphisms J`). Co-authored-by: Christian Merten [christian@merten.dev](mailto:christian@merten.dev) --- - [x] depends on: #24382 - [ ] depends on: #25971 This PR continues the work from #24411. Original PR: https://github.com/leanprover-community/mathlib4/pull/24411	t-category-theory blocked-by-other-PR WIP	323/20	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Cat.lean,Mathlib/CategoryTheory/Bicategory/Grothendieck.lean,Mathlib/CategoryTheory/Bicategory/Strict/Pseudofunctor.lean,Mathlib/CategoryTheory/Sites/Descent/IsPrestack.lean,Mathlib/Tactic/CategoryTheory/ToApp.lean,MathlibTest/CategoryTheory/ToApp.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-29084 8 hours ago	0-29745 8 hours ago	0-208 3 minutes
24434	joelriou author:joelriou	feat(CategoryTheory): effectiveness of descent	Co-authored-by: Christian Merten [christian@merten.dev](mailto:christian@merten.dev) --- - [x] depends on: #24411 - [x] depends on: #24382 - [ ] depends on: #25971 - [x] depends on: #13539 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR WIP	4052/66	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Adj.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/BaseChange.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Mate.lean,Mathlib/CategoryTheory/Bicategory/Functor/Cat.lean,Mathlib/CategoryTheory/Bicategory/Functor/LocallyDiscrete.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean,Mathlib/CategoryTheory/Bicategory/Opposite.lean,Mathlib/CategoryTheory/CommSq.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean,Mathlib/CategoryTheory/Sites/Descent/DescentData.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataAsCoalgebra.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataDoublePrime.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataPrime.lean,Mathlib/CategoryTheory/Sites/Descent/IsPrestack.lean,Mathlib/CategoryTheory/Sites/Descent/IsStack.lean,Mathlib/CategoryTheory/Sites/Descent/ModuleCat.lean,Mathlib/CategoryTheory/Sites/Descent/PullbackStruct.lean	19	n/a	['callesonne', 'chrisflav', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'yuma-mizuno']	nobody	0-28937 8 hours ago	unknown	unknown
29926	jcreinhold author:jcreinhold	feat(CategoryTheory/MarkovCategory): add basic finite stochastic matrices definitions to Markov category	This PR introduces FinStoch, the category of finite stochastic matrices, as a concrete example of a Markov category. This PR builds on #29925, #29939, and #29919 and was split up from #29657. ## Main additions ### 1. Core definitions (`FinStoch/Basic.lean`) - `StochasticMatrix m n`: Matrices where rows sum to 1, representing conditional probabilities P(j\|i) - `FinStoch`: The category with finite types as objects and stochastic matrices as morphisms - `DetMorphism`: Deterministic matrices (exactly one 1 per row) with their underlying functions - Composition: Matrix multiplication preserves row-stochasticity via the Chapman-Kolmogorov equation Key design choices: - Row-stochastic convention: entry (i,j) is P(output=j \| input=i) - Deterministic morphisms tracked separately for structural isomorphisms ### 2. Monoidal structure (`FinStoch/Monoidal.lean`) Implements tensor products modeling independent parallel processes: - Tensor on objects: Cartesian product of finite types - Tensor on morphisms: Kronecker product P((j₁,j₂)\|(i₁,i₂)) = P(j₁\|i₁) × P(j₂\|i₂) - Structural morphisms: Associator, unitors use deterministic permutations - Coherence**: Pentagon and triangle identities verified computationally ## Mathematical significance FinStoch provides the canonical example of a Markov category: - Morphisms: Stochastic matrices/Markov chains - Composition: Chapman-Kolmogorov equation for multi-step transitions - Tensor: Independent parallel processes This models finite probability spaces categorically, where: - Objects represent sample spaces - Morphisms represent probabilistic transitions - Tensor products model independence ## References Fritz (2020) - [ ] depends on: #29925	new-contributor t-category-theory merge-conflict blocked-by-other-PR	1437/0	Mathlib.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Basic.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Deterministic.lean,Mathlib/CategoryTheory/MarkovCategory/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/Cartesian.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Monoidal.lean,MathlibTest/CategoryTheory/MarkovCategory.lean,docs/references.bib	9	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-26292 7 hours ago	0-26293 7 hours ago	0-0 0 seconds
30179	EtienneC30 author:EtienneC30	feat: uncurrying the product measure gives the product measure	--- - [ ] depends on: #30161 - [ ] depends on: #30178 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability blocked-by-other-PR	150/0	Mathlib/Data/Set/Prod.lean,Mathlib/Data/Set/Sigma.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/MeasureTheory/MeasurableSpace/Embedding.lean,Mathlib/Probability/ProductMeasure.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-22752 6 hours ago	0-22752 6 hours ago	0-5 5 seconds
30184	EtienneC30 author:EtienneC30	Indep uncurry	--- - [ ] depends on: #30179 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability blocked-by-other-PR	200/18	Mathlib/Data/Set/Prod.lean,Mathlib/Data/Set/Sigma.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/MeasureTheory/MeasurableSpace/Embedding.lean,Mathlib/Probability/Independence/InfinitePi.lean,Mathlib/Probability/ProductMeasure.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-16293 4 hours ago	0-17512 4 hours ago	0-0 0 seconds
30185	alreadydone author:alreadydone	feat(AlgebraicGeometry): computable/reducible nsmul on elliptic curve	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-algebraic-geometry t-number-theory awaiting-CI blocked-by-other-PR label:t-algebra$	144/80	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/Data/Int/GCD.lean,Mathlib/Data/Nat/BinaryRec.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/Nat/Size.lean,MathlibTest/EllipticCurve.lean	10	1	['github-actions']	nobody	0-2895 48 minutes ago	0-5017 1 hour ago	0-1 1 second

Other lists of PRs

Some other lists of PRs which could be useful:

all PRs without draft status or 'WIP' label whose title does not start with an abbreviation like 'feat', 'style' or 'perf'
all PRs without draft status or 'WIP' label without a 'CI' or 't-something' label
PRs whose labels are contradictory, such as 'WIP' and 'ready-to-merge'

PRs with non-conforming titles

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
28215	5hv5hvnk author:5hv5hvnk	Draft PR, for Strong and Weak connectivity for Digraphs	strong and weak connectivity in Digraphs --- Should resolve a part of issue #26771 Main additions in the PR: 1. Walks in Digraphs (Walk.lean) - Basic walk structure with start and end vertices - Support for walk operations: append, reverse, length - Support functions: getVert, copy, support 2. Walk Decompositions (WalkDecomp.lean) - takeUntil and dropUntil functions to split walks - rotate operation for loop walks - Theorems relating to walk decomposition properties 3. Subgraphs (subgraph.lean) - Subgraph structure for digraphs - Induced and spanning subgraph predicates - Lattice structure (sup, inf, top, bot) - Coercion to standalone digraphs 4. Paths (Paths.lean) - Trail, Path, Circuit, Cycle definitions - Path structure with no repeating vertices - Theorems relating different path types - Basic connectivity definitions (reachable, weakly/strongly connected) 5. Connectivity (Connected.lean) - Reachability relations and properties - Strong and weak connectivity definitions - Connected component types: - StronglyConnectedComponent - WeaklyConnectedComponent - ConnectedComponent - Component properties and equivalence relations --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics awaiting-author	1216/0	Mathlib/Combinatorics/Digraph/Connected.lean,Mathlib/Combinatorics/Digraph/Paths.lean,Mathlib/Combinatorics/Digraph/Subgraph.lean,Mathlib/Combinatorics/Digraph/Walk.lean,Mathlib/Combinatorics/Digraph/WalkDecomp.lean	5	3	['github-actions', 'grunweg']	nobody	41-37219 1 month ago	41-37219 1 month ago	12-41939 12 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	31-5860 1 month ago	39-10138 1 month ago	39-15450 39 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	29-58682 29 days ago	31-7948 1 month ago	64-69211 64 days
26310	kckennylau author:kckennylau	Binary form	This PR provides the basic definition of binary forms, which are homogeneous polynomials in two variables. --- - [ ] depends on: #26312 - [ ] depends on: #26313 - [ ] depends on: #26314 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	73/0	Mathlib.lean,Mathlib/RingTheory/MvPolynomial/BinaryForm.lean	2	13	['MichaelStollBayreuth', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'ocfnash']	ocfnash assignee:ocfnash	29-47063 29 days ago	45-36734 1 month ago	57-1104 57 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	28-5857 28 days ago	36-24509 1 month ago	36-24540 36 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 awaiting-author	71/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/CategoryTheory/Types/Monomorphisms.lean	3	7	['dagurtomas', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	TwoFX assignee:TwoFX	8-15110 8 days ago	8-15110 8 days ago	27-18061 27 days
29769	Vierkantor author:Vierkantor	CI: run a weekly linter workflow	This PR adds a workflow analogous to the nightly regression lints, that reports possible refactors using the tactic analysis framework. Those would be too noisy or take too much time to run in regular CI. As a first linter, we have the `mergeWithGrind` linter that reports when a sequence of tactics followed by `grind` can become just `grind`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	102/1	.github/workflows/weekly-lints.yml,Mathlib/Init.lean	2	1	['github-actions']	bryangingechen assignee:bryangingechen	8-5846 8 days ago	15-56755 15 days ago	15-56733 15 days
29501	Vierkantor author:Vierkantor	test(TacticAnalysis): ensure `classical`'s effects are picked up	This test case used to fail, and needed a fix to the `classical` tactic in the standard library: - [x] depends on: https://github.com/leanprover/lean4/pull/10332 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-meta	10/0	MathlibTest/TacticAnalysis.lean	1	6	['Vierkantor', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-65172 4 days ago	6-57649 6 days ago	8-64542 8 days
27258	JovanGerb author:JovanGerb	Imo2020 q6	Original PR: #23431 This PR adds a solution to IMO 2020 Q6. It follows the solution that I found when I was participating in the IMO. I used the statement formalization that was given by @jsm28. TODO: The function `project a b p` that is defined here should be replaced with `signedDist a p (b -ᵥ a)`. --- - [x] depends on: #27257 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO	346/0	Archive.lean,Archive/Imo/Imo2020Q6.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	dwrensha assignee:dwrensha	4-5853 4 days ago	11-37940 11 days ago	11-39221 11 days
30121	idontgetoutmuch author:idontgetoutmuch	Principal fiber bundle core	A structure capturing what it means to be a principal fibre bundle. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-differential-geometry	227/0	Mathlib.lean,Mathlib/Geometry/Manifold/PrincipalFiberBundle/PrincipalGBundle.lean	2	5	['github-actions', 'grunweg']	nobody	0-56943 15 hours ago	0-69917 19 hours ago	1-62870 1 day
30034	yonggyuchoimath author:yonggyuchoimath	feat(Mathlib/AlgebraicGeometry/AffineScheme): add preservation of limits of affine schemes	This PR adds simple results about affine schemes. Main changes: * `forgetToSchemeCreatesLimits`: The forgetful functor `AffineScheme ⥤ Scheme` creates small limits. * `forgetToSchemeCreatesColimits`: The dual statement * (written by @erdOne) `preservesLimit_rightOp_Γ`: Shows that `Scheme.Γ.rightOp : Scheme ⥤ CommRingCatᵒᵖ` preserves limits of diagrams consisting of affine schemes. * `preservesColimit_Γ`: The dual statement. This PR reopens #30015, which was acidentally closed by myself. --- - [ ] depends on: #30014		33/0	Mathlib/AlgebraicGeometry/AffineScheme.lean	1	16	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'yonggyuchoimath']	nobody	0-54325 15 hours ago	5-38174 5 days ago	5-47765 5 days
30070	adomani author:adomani	CI: remove deprecations automatically	This workflow automates the removal of deprecated declarations. The action is currently configured to run once a week to automatically remove all deprecations older than 6 months. This is managed by the `remove_deprecated_decls` action and depends on the two files `Mathlib/Tactic/Linter/CommandRanges.lean` and `Mathlib/Tactic/Linter/FindDeprecations.lean`. The action can be manually triggered and there is the option of passing two dates in `YYYY-MM-DD` format or also the more human "3 months ago", as long as it is a valid input for `date -d`. The lean files take care of identifying the declarations with the deprecated attribute whose `since` field is between the given ranges. Those declarations then get automatically removed and, if there are no errors, the bot creates a PR with the changes. These PRs then go, naturally, through CI, where issues related to having removed the deprecated declarations will be picked up. The bot also posts a comment on Zulip mentioning when the PR has been opened. Co-authored-by: Bryan Gin-ge Chen --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	595/0	.github/workflows/remove_deprecated_decls.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/CommandRanges.lean,Mathlib/Tactic/Linter/FindDeprecations.lean,MathlibTest/FindDeprecations.lean	6	26	['Vierkantor', 'adomani', 'bryangingechen', 'github-actions']	nobody	0-34633 9 hours ago	2-84970 2 days ago	3-27927 3 days
30162	bryangingechen author:bryangingechen	ci(label_new_contributor.yml): only trigger when PR is opened	Currently, this is triggered even when new bots push a commit to a PR (e.g. the pre-commit.ci bot); adding the `types` filter will prevent the `new-contributor` label being added in such cases. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	8/1	.github/workflows/label_new_contributor.yml	1	4	['bryangingechen', 'github-actions', 'pechersky']	nobody	0-25403 7 hours ago	0-48137 13 hours ago	0-48116 13 hours
27918	kim-em author:kim-em	wip: refactor WithBot/WithTop as structures	For now we are still relying on `WithBot` and `WithTop` being defeq, but there is no impossible obstacle to converting them both to the same structure. This PR begins this effort; the modified files are all compiling, but there are more files that still have problems. Help on this (either ask to push to my branch, PR to my branch, or just adopt the whole thing!) very much appreciated.	file-removed	955/354	Mathlib.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Monoid/ToMulBot.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/BoxIntegral/Partition/SubboxInduction.lean,Mathlib/Analysis/Meromorphic/Order.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Data/Countable/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENat/Defs.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Finset/WithBot.lean,Mathlib/Data/Fintype/WithTopBot.lean,Mathlib/Data/List/MinMax.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Ordmap/Invariants.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/Sum/Order.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/Logic/Embedding/WithBot.lean,Mathlib/Logic/Equiv/WithBot.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Real.lean,Mathlib/MeasureTheory/Group/Measure.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/Order/Category/BddLat.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Hom/WithTopBot.lean,Mathlib/Order/Interval/Basic.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/Interval/Set/WithBotTop.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/Set.lean,Mathlib/Order/SuccPred/Basic.lean,Mathlib/Order/TypeTags.lean,Mathlib/Order/WithBot/Basic.lean,Mathlib/Order/WithBot/BooleanAlgebra.lean,Mathlib/Order/WithBot/NAry.lean,Mathlib/RingTheory/UniqueFactorizationDomain/FactorSet.lean,Mathlib/SetTheory/Cardinal/ENat.lean,Mathlib/Topology/Algebra/Ring/Real.lean,Mathlib/Topology/Category/LightProfinite/Sequence.lean,Mathlib/Topology/Compactification/OnePoint/Basic.lean,Mathlib/Topology/Instances/ENat.lean,MathlibTest/lift.lean	56	11	['eric-wieser', 'github-actions', 'kim-em', 'mathlib4-merge-conflict-bot']	nobody	0-18119 5 hours ago	1-66788 1 day ago	48-77812 48 days
27844	CBirkbeck author:CBirkbeck	Add q-expansion identities for Eisenstein series.	This is PR contains some q-expansion identities that are needed to give the q-expansions of Eisenstein series, which will be added as part of #27606. --- - [x] depends on: #27212 - [x] depends on: #27837 - [x] depends on: #27839 - [x] depends on: #27840 - [x] depends on: #27841 - [x] depends on: #26016 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-number-theory	257/0	Mathlib.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/SummableUniformlyOn.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/NumberTheory/LSeries/RiemannZeta.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Defs.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean	7	44	['CBirkbeck', 'MichaelStollBayreuth', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-13233 3 hours ago	0-24822 6 hours ago	0-59336 16 hours
25474	adomani author:adomani	test for .lean/.md check	A test PR for #25473. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-linter merge-conflict	10/1	.github/workflows/lint_and_suggest_pr.yml,Mathlib.lean,Mathlib/NumberTheory/NumberField/CMField.Lean	3	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	60-58915 1 month ago	60-58915 1 month ago	29-67280 29 days
28933	artie2000 author:artie2000	WIP chore(Data): correct definition for `single_apply`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	101/98	Counterexamples/DirectSumIsInternal.lean,Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/DFinsupp/Sigma.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Finsupp/SMul.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/Finsupp/ToDFinsupp.lean,Mathlib/LinearAlgebra/Basis/Basic.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/Basis/Prod.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Finsupp/LinearCombination.lean,Mathlib/LinearAlgebra/Finsupp/Supported.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean,Mathlib/LinearAlgebra/FreeModule/Finite/CardQuotient.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Multilinear/DFinsupp.lean,Mathlib/LinearAlgebra/StdBasis.lean,Mathlib/RingTheory/MvPolynomial/Groebner.lean	31	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	38-10669 1 month ago	38-10670 1 month ago	0-75271 20 hours
29345	adomani author:adomani	test: automatically remove deprecations from before 2025-02-31	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	201/1358	Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/InnerProductSpace/Projection/Basic.lean,Mathlib/Combinatorics/Matroid/Circuit.lean,Mathlib/Combinatorics/Matroid/Closure.lean,Mathlib/Combinatorics/Matroid/Minor/Restrict.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/Primrec.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/SuccPred.lean,Mathlib/Data/Finite/Card.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Fintype/BigOperators.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/List/GetD.lean,Mathlib/Data/List/MinMax.lean,Mathlib/Data/List/ModifyLast.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/NodupEquivFin.lean,Mathlib/Data/List/OfFn.lean,Mathlib/Data/List/ReduceOption.lean,Mathlib/Data/List/Rotate.lean,Mathlib/Data/List/Scan.lean,Mathlib/Data/List/TakeDrop.lean,Mathlib/Data/List/Zip.lean,Mathlib/Data/Matrix/ColumnRowPartitioned.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Seq/Defs.lean,Mathlib/Data/Set/Finite/Basic.lean,Mathlib/Data/Set/List.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/Stream/Init.lean,Mathlib/Data/String/Lemmas.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Constructions.lean,Mathlib/Geometry/RingedSpace/Basic.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/Pointwise.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Basic.lean,Mathlib/LinearAlgebra/Dimension/Constructions.lean,Mathlib/LinearAlgebra/Dimension/RankNullity.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/Spectrum.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/List.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/AEMeasurable.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/LpSeminorm/ChebyshevMarkov.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Defs.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Trim.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Complete.lean,Mathlib/MeasureTheory/Function/LpSpace/Indicator.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Lp.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/CircleTransform.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Countable.lean,Mathlib/MeasureTheory/Measure/Content.lean,Mathlib/MeasureTheory/Measure/Count.lean,Mathlib/ModelTheory/Basic.lean,Mathlib/ModelTheory/Definability.lean,Mathlib/ModelTheory/ElementarySubstructures.lean,Mathlib/ModelTheory/LanguageMap.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Substructures.lean,Mathlib/ModelTheory/Syntax.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/IsBoundedAtImInfty.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/NumberTheory/NumberField/House.lean,Mathlib/Order/Filter/AtTopBot/Monoid.lean,Mathlib/Order/Filter/AtTopBot/Ring.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Max.lean,Mathlib/Order/WithBot.lean,Mathlib/Probability/IdentDistrib.lean,Mathlib/Probability/Independence/Integrable.lean,Mathlib/Probability/Kernel/Composition/IntegralCompProd.lean,Mathlib/Probability/Kernel/Invariance.lean	132	0	[]	nobody	29-43206 29 days ago	29-43206 29 days ago	0-49 49 seconds
29574	JarodUW author:JarodUW	Regular local rings are domains	We have added three new files in Mathlib/RingTheory/LocalRing * EmbeddingDimension.lean * LocalRingDimension.lean * RegularLocalRings.lean We have added two lemmas and an instance in Mathlib/RingTheory/LocalRing/RingHom/Basic.lean This work was done by Jarod Alper and Brian Nugent. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor merge-conflict	910/3	Mathlib.lean,Mathlib/RingTheory/LocalRing/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRing/LocalRingDimension.lean,Mathlib/RingTheory/LocalRing/RegularLocalRings.lean,Mathlib/RingTheory/LocalRing/RingHom/Basic.lean,lake-manifest.json	6	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	18-83255 18 days ago	18-83256 18 days ago	3-7974 3 days
29605	alreadydone author:alreadydone	experiment(Algebra): unbundle npow/zpow from Monoid/InvDivMonoid	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict label:t-algebra$	1527/1020	Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Category/MonCat/ForgetCorepresentable.lean,Mathlib/Algebra/Divisibility/Basic.lean,Mathlib/Algebra/Divisibility/Units.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/Power.lean,Mathlib/Algebra/Field/Rat.lean,Mathlib/Algebra/Group/Action/Basic.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Commute/Basic.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/Commute/Units.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Even.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Idempotent.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Irreducible/Lemmas.lean,Mathlib/Algebra/Group/Nat/Defs.lean,Mathlib/Algebra/Group/Nat/Hom.lean,Mathlib/Algebra/Group/NatPowAssoc.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/PUnit.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Semiconj/Basic.lean,Mathlib/Algebra/Group/Semiconj/Defs.lean,Mathlib/Algebra/Group/Semiconj/Units.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Subgroup/ZPowers/Basic.lean,Mathlib/Algebra/Group/Submonoid/BigOperators.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Support.lean,Mathlib/Algebra/Group/Torsion.lean,Mathlib/Algebra/Group/TransferInstance.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/ULift.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Commute.lean,Mathlib/Algebra/GroupWithZero/Conj.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Divisibility.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/GroupWithZero/Indicator.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Semiconj.lean,Mathlib/Algebra/GroupWithZero/ULift.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/GroupWithZero/Units/Lemmas.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/NoZeroSMulDivisors/Defs.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/BigOperators/Group/Multiset.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/List.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/Multiset.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Action.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/Finset.lean,Mathlib/Algebra/Order/Group/Lattice.lean,Mathlib/Algebra/Order/Group/Multiset.lean,Mathlib/Algebra/Order/Group/PosPart.lean,Mathlib/Algebra/Order/Group/Synonym.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean	162	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	18-36401 18 days ago	18-36402 18 days ago	0-2 2 seconds
28067	grunweg author:grunweg	Docstring enumerations	Tracking PR; to be split. Audit all ocurrences of `^ \S`; exhaustive. --- - [x] depends on: #28068 - [x] depends on: #28069 - [ ] depends on: #28070 - [x] depends on: #28118 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	264/263	Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Module/LinearMap/Polynomial.lean,Mathlib/CategoryTheory/Abelian/NonPreadditive.lean,Mathlib/CategoryTheory/EqToHom.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/Pi.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/Condensed/Discrete/Characterization.lean,Mathlib/FieldTheory/ChevalleyWarning.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Basic.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/OuterMeasure/Basic.lean,Mathlib/MeasureTheory/OuterMeasure/Defs.lean,Mathlib/NumberTheory/FLT/Basic.lean,Mathlib/NumberTheory/LSeries/PrimesInAP.lean,Mathlib/RingTheory/Grassmannian.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean,Mathlib/RingTheory/WittVector/Teichmuller.lean,Mathlib/Tactic/Bound.lean,Mathlib/Tactic/Bound/Attribute.lean,Mathlib/Tactic/ENatToNat.lean,Mathlib/Tactic/FBinop.lean,Mathlib/Tactic/IntervalCases.lean,Mathlib/Tactic/TermCongr.lean,Mathlib/Util/Notation3.lean,Mathlib/Util/Superscript.lean,docs/Conv/Guide.lean	38	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	13-52070 13 days ago	13-52070 13 days ago	0-2904 48 minutes
28718	imbrem author:imbrem	Added chosen finite coproducts	Added basic `ChosenFiniteCoproducts` class, and started porting some of the lemmas about `ChosenFiniteProducts` suitably translated --- This, combined with #20182 modified to use chosen finite coproducts and premonoidal categories (#21488), should be enough for me to formalize strong Elgot categories, and hence a lot of categorical iteration theory for my PhD thesis. Re-done from #21603 to deal with changes in #24399 and #24390 Eventually, if we really want to harmonize approaches, we could introduce an `AddMonoidalCategory` struct and do the analogous to #24399 and #24390 for additive monoidal structure, but that seems like a massive overcomplication for now. It would allow formalizing fun things like rig categories, though. - [ ] depends on: #30150	new-contributor t-category-theory awaiting-author blocked-by-other-PR	290/0	Mathlib.lean,Mathlib/CategoryTheory/ChosenFiniteCoproducts.lean	2	8	['YaelDillies', 'github-actions', 'imbrem', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	0-65678 18 hours ago	0-65679 18 hours ago	0-24930 6 hours

PRs without an area label

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
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	27-5849 27 days ago	40-22590 1 month ago	40-24338 40 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']	dupuisf assignee:dupuisf	15-5846 15 days ago	22-31679 22 days ago	22-32331 22 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	6	['ShreckYe', 'bryangingechen', 'eric-wieser', 'github-actions']	bryangingechen assignee:bryangingechen	14-17690 14 days ago	26-53642 26 days ago	26-53685 26 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']	dupuisf assignee:dupuisf	14-5857 14 days ago	21-52041 21 days ago	21-52017 21 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/)	awaiting-author	90/50	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	17	['chrisflav', 'github-actions', 'grunweg', 'kim-em', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	8-41788 8 days ago	8-41788 8 days ago	48-60022 48 days
28728	or4nge19 author:or4nge19	feat(PerronFrobenius): introduce Irreducible and Primitive Matrices and relations to Quiver	This PR develops a graph-theoretic interface for studying nonnegative square matrices over `ℝ` through the quiver formed by their strictly positive entries. It shows the equivalence between positivity of suitable matrix powers and existence of directed paths in this quiver. ------------ - [ ] depends on: #28696 - [ ] depends on:#29754 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-author	289/0	Mathlib.lean,Mathlib/Combinatorics/Quiver/Path/StronglyConnected.lean,Mathlib/LinearAlgebra/Matrix/Irreducible/Defs.lean	3	6	['github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'or4nge19']	nobody	7-62867 7 days ago	20-27827 20 days ago	0-32474 9 hours
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`	awaiting-author	191/0	Mathlib/Analysis/InnerProductSpace/Orthogonal.lean	1	7	['github-actions', 'mathlib4-dependent-issues-bot', 'sgouezel', 'yoh-tanimoto']	sgouezel assignee:sgouezel	7-25844 7 days ago	8-47952 8 days ago	12-74361 12 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/)	awaiting-zulip maintainer-merge new-contributor	158/0	Counterexamples.lean,Counterexamples/EulerSumOfPowers.lean	2	43	['MichaelStollBayreuth', 'NotWearingPants', 'eric-wieser', 'github-actions', 'tb65536', 'urkud']	MichaelStollBayreuth assignee:MichaelStollBayreuth	7-24820 7 days ago	7-24876 7 days ago	24-25032 24 days
30038	JovanGerb author:JovanGerb	feat(push): `@[push]` annotations for `fun`	This PR adds the annotations for the tactics `push fun _ ↦ _` and `pull fun _ ↦ _` and the simprocs `pushFun` and `pullFun`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		28/6	Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Data/Nat/Cast/Basic.lean,Mathlib/Order/Lattice.lean,MathlibTest/push.lean	4	1	['github-actions']	nobody	6-9803 6 days ago	6-9871 6 days ago	6-9848 6 days
29512	grunweg author:grunweg	feat: check for PR titles which do not start with "feat" etc.	We ignore draft PRs and PRs with the WIP label. The set of checks is intentionally kept small, and could be expanded in the future. --- More basic version of #16303: given that mathlib's statistics will use the PR kind, let's make sure PR kinds are somewhat appropriate. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		365/0	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ValidatePRTitle.lean,lakefile.lean,scripts/README.md,scripts/check_title_labels.lean	10	17	['bryangingechen', 'eric-wieser', 'github-actions', 'grunweg']	bryangingechen assignee:bryangingechen	5-73776 5 days ago	23-36211 23 days ago	23-36187 23 days
30042	JovanGerb author:JovanGerb	feat(push): `@[push]` attributes for `∈` in `Set`, `Finset` and `Multiset`	This PR adds `@[push]` annotations for the membership relations, for `Set`, `Finset` and `Multiset`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		169/104	Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/ListOfFn.lean,Mathlib/Algebra/Order/Group/Multiset.lean,Mathlib/Data/DFinsupp/Interval.lean,Mathlib/Data/Finmap.lean,Mathlib/Data/Finset/BooleanAlgebra.lean,Mathlib/Data/Finset/Dedup.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Disjoint.lean,Mathlib/Data/Finset/Filter.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Insert.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Finset/Pi.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Finset/Range.lean,Mathlib/Data/Finset/SDiff.lean,Mathlib/Data/Finset/Sigma.lean,Mathlib/Data/Finset/Sum.lean,Mathlib/Data/Finset/Sups.lean,Mathlib/Data/Finset/Union.lean,Mathlib/Data/Fintype/Defs.lean,Mathlib/Data/Multiset/AddSub.lean,Mathlib/Data/Multiset/Antidiagonal.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Dedup.lean,Mathlib/Data/Multiset/Defs.lean,Mathlib/Data/Multiset/Filter.lean,Mathlib/Data/Multiset/FinsetOps.lean,Mathlib/Data/Multiset/MapFold.lean,Mathlib/Data/Multiset/Pi.lean,Mathlib/Data/Multiset/Range.lean,Mathlib/Data/Multiset/Replicate.lean,Mathlib/Data/Multiset/Sort.lean,Mathlib/Data/Multiset/Sum.lean,Mathlib/Data/Multiset/UnionInter.lean,Mathlib/Data/Multiset/ZeroCons.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/Interval/Multiset.lean,Mathlib/Order/Interval/Set/Defs.lean,Mathlib/Order/SetNotation.lean,MathlibTest/push.lean	48	1	['github-actions']	nobody	5-61106 5 days ago	6-6917 6 days ago	6-6894 6 days
30039	JovanGerb author:JovanGerb	feat(push): `@[push]` annotations for `Real.log`	This PR adds `push` annotations, and tests for `Real.log`. It also updates the `#push` and `#pull` commands so that they can take a discharger, and can take any head. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		45/18	Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Tactic/Push.lean,MathlibTest/push.lean	4	1	['github-actions']	nobody	5-60724 5 days ago	6-9808 6 days ago	6-9785 6 days
30037	linesthatinterlace author:linesthatinterlace	feat: Fin.find update	We currently define `Fin.find` in a way that is redundant (in the sense that it is just equivalent to `Fin.find?` in batteries). This PR replaces it with a definition that works closer to `Nat.find`, and links the new definition of `Fin.find` to `Fin.find?` in the natural way. --- - [ ] depends on: batteries#1431 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		137/103	Mathlib/Data/Fin/Tuple/Basic.lean,lake-manifest.json	2	6	['github-actions', 'linesthatinterlace', 'llllvvuu', 'mathlib4-merge-conflict-bot']	nobody	4-33080 4 days ago	4-33098 4 days ago	6-2604 6 days
30073	JovanGerb author:JovanGerb	feat: new `by_cases!` tactic	This PR defines the `by_cases! h : p` tactic, which is a macro for `by_cases h : p` followed by a `try push_neg at h` in the second goal. We use `try push_neg` instead of `push_neg` to make the tactic also succeed when no negation is pushed. Should this maybe throw an warning? This PR also refactors many proofs to use `by_cases!` The tactic implementation can be found in the first commit. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	574/717	Archive/Imo/Imo2024Q6.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Mathlib.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/Category/Grp/Adjunctions.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/GCDMonoid/Multiset.lean,Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Homology/Embedding/TruncGE.lean,Mathlib/Algebra/Homology/HomotopyCofiber.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Algebra/Polynomial/Degree/TrailingDegree.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/OfFn.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/AlgebraicTopology/DoldKan/Decomposition.lean,Mathlib/AlgebraicTopology/DoldKan/Faces.lean,Mathlib/AlgebraicTopology/DoldKan/Projections.lean,Mathlib/AlgebraicTopology/SimplicialObject/II.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unique.lean,Mathlib/Analysis/CStarAlgebra/Unitization.lean,Mathlib/Analysis/Calculus/FDeriv/Extend.lean,Mathlib/Analysis/Calculus/FDeriv/Norm.lean,Mathlib/Analysis/Calculus/LocalExtr/Rolle.lean,Mathlib/Analysis/Calculus/SmoothSeries.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Analysis/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Convex/EGauge.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Hofer.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/Meromorphic/NormalForm.lean,Mathlib/Analysis/Normed/Group/Ultra.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Unbundled/RingSeminorm.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromBounded.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Analysis/Polynomial/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/Log.lean,Mathlib/Analysis/SpecialFunctions/Log/PosLog.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Complex.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Analysis/SumOverResidueClass.lean,Mathlib/CategoryTheory/Limits/Shapes/Preorder/WellOrderContinuous.lean,Mathlib/Combinatorics/Additive/RuzsaCovering.lean,Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Combinatorics/HalesJewett.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/Matroid/IndepAxioms.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/Combinatorics/SetFamily/Intersecting.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Equitabilise.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Control/LawfulFix.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/Int/Order/Basic.lean,Mathlib/Data/List/Intervals.lean,Mathlib/Data/Nat/Choose/Factorization.lean,Mathlib/Data/Nat/Digits/Lemmas.lean,Mathlib/Data/Nat/Nth.lean,Mathlib/Data/Real/Embedding.lean,Mathlib/Data/Set/Card/Arithmetic.lean,Mathlib/Data/Set/Equitable.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/FieldTheory/JacobsonNoether.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/Basic.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Geometry/Manifold/IntegralCurve/UniformTime.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/LinearAlgebra/Basis/Defs.lean	203	2	['JovanGerb', 'github-actions']	nobody	3-53929 3 days ago	4-34683 4 days ago	4-34725 4 days
29314	Louddy author:Louddy	feat(SkewMonoidAlgebra): Lifts for skew monoid algebras	Lemmas about different kinds of "lifts" to `SkewMonoidAlgebra` - Similar in spirit to the MonoidAlgebra.Lift file. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [x] depends on: #29310 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		238/2	Mathlib.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/SkewMonoidAlgebra/Lift.lean	3	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	riccardobrasca assignee:riccardobrasca	2-57507 2 days ago	4-25355 4 days ago	4-30773 4 days
30133	smmercuri author:smmercuri	feat: `WithVal v` and `WithVal w` are isomorphic as uniform spaces when `v` and `w` are equivalent valuations	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		93/0	Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	2	1	['github-actions']	nobody	1-33668 1 day ago	1-33740 1 day ago	1-33717 1 day
29976	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Topology/Semicontinuous): lower bounds on compact sets	Prove that lower semicontinuous functions attain their lower bound on nonempty compact sets, and the analogous lemma for upper semicontinuous functions. By the way, add several basic results for semicontinuous functions, relating the WithinAt, At, On versions. Co-authored with @ADedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		300/1	Mathlib/Order/Filter/Extr.lean,Mathlib/Topology/Semicontinuous.lean	2	1	['github-actions']	TwoFX assignee:TwoFX	1-5851 1 day ago	8-25216 8 days ago	8-25193 8 days
30149	NotWearingPants author:NotWearingPants	feat(Combinatorics/SimpleGraph/Hamiltonian): `p.support.get` and `p.getVert` define equivalences with `Fin`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	38/2	Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Data/List/NodupEquivFin.lean	3	1	['github-actions']	nobody	0-54119 15 hours ago	0-82426 22 hours ago	0-82411 22 hours
29960	yonggyuchoimath author:yonggyuchoimath	feat(Algebra/Category/Ring): equalizers of pushout maps of tensor product inclusions	This PR defines a ring map `S →ₗ[R] S ⊗[R] S : s ↦ (s ⊗ₜ[R] 1) - (1 ⊗ₜ[R] s)` for an `R`-algebra `S`, and show that its kernel is exactly (the image of) `R` if `S` is faithfully flat over `R`. Changes: * `TensorProduct.AlgebraTensorModule.distribBaseChange`: Origianlly takes `M` and `N`, where `M` is an `R`-module with an additional instance `IsScalarTower R A M`. This is unnecessary, so I changed the `M` and `N` into `N` and `Q`, now both of which are merely modules over `R`. Main results : * Add compatibility of `Algebra.TensorProduct.includeLeft` (or `Algebra.TensorProduct.includeRight`) with `TensorProduct.AlgebraTensorModule.distribBaseChange` and `LinearMap.lTensor` * Define `Algebra.TensorProduct.includeLeftSubRight`, which is the `R`-linear map `S →ₗ[R] S ⊗[R] S` sending `s : S` to `(s ⊗ₜ[R] 1) - (1 ⊗ₜ[R] s)`. * `Algebra.TensorProduct.exactIncludeLeftSubRight_of_faithfullyFlat`: the pair `algebraMap : R → S` and `includeLeftSubRight R S : S → S ⊗[R] S` is exact if `S` is a faithfully flat `R`-algebra.	new-contributor	229/1	Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/IncludeLeftSubRight.lean	4	3	['erdOne', 'github-actions', 'yonggyuchoimath']	nobody	0-42252 11 hours ago	3-26138 3 days ago	5-60608 5 days
30150	imbrem author:imbrem	feat(CategoryTheory/Monoidal): to_additive for MonoidalCategory	Added `AddMonoidalCategory`, the additive version of `MonoidalCategory`. --- As discussed in #28718; I added an `AddMonoidalCategory` struct and tagged `MonoidalCategory` with `to_additive`, along with the lemmas in `Category.lean`. To get this to work, I needed to _remove_ the `to_additive` attributes in `Discrete.lean`, since otherwise the instances and lemmas within would be ill-typed (as MonoidalCategory would be replaced with AddMonoidalCategory). We simply implement the additive variants by hand instead. I think this is the right approach, since under this framework the "correct" additive version of `Discrete.lean` would be mapping an `AddMonoid` to an `AddMonoidalCategory`. Next steps would be to: - Make `monoidal_coherence` and `coherence` support `AddMonoidalCategory` - Add `CocartesianMonoidalCategory` extending `AddMonoidalCategory` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor	408/126	Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/Tactic/ToAdditive/GuessName.lean	3	5	['JovanGerb', 'YaelDillies', 'github-actions', 'imbrem']	nobody	0-8867 2 hours ago	0-81284 22 hours ago	0-81321 22 hours
29788	robertmaxton42 author:robertmaxton42	feat (Topology): adds bundled continuous maps for sum, sigma, subtype, mapsto, inclusion	Adds a collection of bundled continuous maps and homeomorphisms, and helper lemmas for working with their compositions. Bundling of existing continuity lemmas: * `ContinuousMap.subtypeVal` * `ContinuousMap.inl` and `.inr`; `ContinuousMap.sum` bundles `Continuous.sumElim`; `ContinuousMap.sumMap`, which is a quotient map when both components are quotient maps * `ContinuousMap.sigmaMap`, which is a quotient map when given a family of quotient maps * `ContinuousMap.mapsTo` bundles `ContinuousOn.restrict_mapsTo` New functions: * `ContinuousMap.preimageValIncl : C(s ↓∩ t, t)` and `.inclPreimageVal C(s, t ↓∩ s)`, and their unbundled functions in `Set` * `Homeomorph.Set.preimageVal` witnesses that the two are opposite directions of a homeomorphism * Descending from a coherent set of subspaces is a quotient map The primary use for these bundled maps is easy composition and the ability to introduce them by rewriting right-to-left: it is much more convenient to write `subtypeVal.comp _` than to use either the anonymous constructor (which doesn't work in any position without an expected type) or `ContinuousMap.mk` (which will disappear as soon as it is coerced to a function, making it difficult to use in mixed-categorical contexts where many maps can only be reduced by introducing a composition with some other map.) This PR is part of a family of PRs that ultimately construct transformations in both directions between the concrete `Topology.RelCWComplex` and abstract `TopCat.RelativeCWComplex`. `.mapsTo` in particular bundles together a couple of potentially nontrivial proofs in a way that makes them easy to refer to later; I use it and `.subtypeVal` particularly heavily later in a dependent PR to build the cell inclusion maps on both sides of the equivalence. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	226/3	Mathlib/Data/Set/Subset.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Coherent.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Basic.lean,scripts/noshake.json	7	6	['adamtopaz', 'github-actions', 'robertmaxton42']	adamtopaz assignee:adamtopaz	0-3341 55 minutes ago	0-3361 55 minutes ago	14-85842 14 days
24100	eric-wieser author:eric-wieser	feat: restore some explicit binders from Lean 3	Part of #24099 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt merge-conflict awaiting-author	39/42	Mathlib/Data/FinEnum.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Compactness/CompactlyGeneratedSpace.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/Metrizable/CompletelyMetrizable.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	10	3	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	131-45036 4 months ago	131-45038 4 months ago	34-33204 34 days
29076	yury-harmonic author:yury-harmonic	feat(BigOperators/ModEq): new file	--- - [ ] depends on: #29072 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	319/15	Mathlib.lean,Mathlib/Algebra/BigOperators/ModEq.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Data/Nat/ModEq.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	36-24068 1 month ago	36-30906 1 month ago	0-726 12 minutes
28819	ScottCarnahan author:ScottCarnahan	feat (Data/Finsupp): define convolution smul for finsupps on formal functions	This is a generalization of the multiplication action of the ring of Laurent polynomials on the space of formal power series with unbounded pole terms. --- - [ ] depends on: #28876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	127/15	Mathlib.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Data/Finset/SMulAntidiagonal.lean,Mathlib/Data/Finsupp/PointwiseSMul.lean,Mathlib/Data/Set/SMulAntidiagonal.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	34-54933 1 month ago	34-60327 1 month ago	1-6093 1 day
28905	grunweg author:grunweg	feat: immersions are locally embeddings	Hopefully, this can be used for the topological portion of #28865. (That part is not certain yet, the rest works.) --- TODO: move two helper results about embeddings to their proper place; perhaps even PR separately - [ ] depends on: #28793 - [ ] depends on: #28796 - [ ] depends on: #28853 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	792/7	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Topology/PartialHomeomorph.lean,docs/references.bib,temp_.sh	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	25-18926 25 days ago	25-18927 25 days ago	0-617 10 minutes
29077	grunweg author:grunweg	feat(Manifold/Instances/Icc): golf smoothness proof using immersions	Prove that the inclusion of an interval into the real numbers is a smooth immersion, and use this to golf the proof that this inclusion is smooth. TODO: right now, the computation doesn't check out; I need to tweak the charts I have. But that is surely doable. A future PR will prove it is a smooth embedding. --- - [ ] depends on: #28865 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	1122/56	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/Instances/Icc.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Topology/PartialHomeomorph.lean,docs/references.bib,temp_.sh	13	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	25-18925 25 days ago	25-18925 25 days ago	0-309 5 minutes
29243	yoh-tanimoto author:yoh-tanimoto	feat(Analysis/InnerProductSpace/Projection/Submodule): add `sup_orthogonal` for `ClosedSubmodules`	prove that the closed submodule generated by the orthogonal complements of two submodules is the orthogonal complement of the intersection. motivation: needed to define standard subspaces in a Hilbert space #29251 https://ems.press/content/serial-article-files/48171 - [ ] depends on: #29230 for `Lattice` `CompleteLattice` - [ ] depends on: #29241 for the definition of `orthogonal`	merge-conflict blocked-by-other-PR	354/1	Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/Projection/Submodule.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	21-33999 21 days ago	21-33999 21 days ago	0-2553 42 minutes
29251	yoh-tanimoto author:yoh-tanimoto	feat(Analysis/InnerProductSpace/): define standard subspaces of a complex Hilbert space	define standard subspaces of a complex Hilbert space: a standard subspace `S` of `H` is a closed real subspace `S` such that `S ⊓ i S = ⊥` and `S ⊔ i S = ⊤`. prove that the symplectic complement of `S` is again a standard subspace and the double symplectic complement is itself. motivation: one can define a closable operator `x + i y ↦ x - i y` and develop an analogue of the Tomita-Takesaki modular theory for von Neumann algebras. By considering inclusions of standard subspaces, one can obtain unitary representations of various Lie groups. https://ems.press/content/serial-article-files/48171 - [ ] depends on: #29230 for `Lattice` `CompleteLattice` - [ ] depends on: #29241 for the definition of `orthogonal` - [ ] depends on: #29243 for `sup_orthogonal` - [ ] depends on: #29235 for `mapEquiv`	merge-conflict blocked-by-other-PR	699/2	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/Projection/Submodule.lean,Mathlib/Analysis/InnerProductSpace/StandardSubspace.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	21-33876 21 days ago	21-33877 21 days ago	0-3098 51 minutes
29282	Jlh18 author:Jlh18	feat(CategoryTheory): HasColimits instance onGrpd	Show that the category of groupoids has all small colimits, as a coreflective subcategory of `Cat`, which has all small colimits. The right adjoint of the forgetful functor is the core functor `CategoryTheory.Core.functor`. - [ ] depends on: #29283 [Core of a category as a functor] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict blocked-by-other-PR	140/4	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Colimit.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Core.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-55828 16 days ago	16-55829 16 days ago	0-396 6 minutes
29283	Jlh18 author:Jlh18	feat(CategoryTheory): define forgetful-core adjunction between Cat and Grpd	* Define `CategoryTheory.Core.functor`: the functor `Cat ⥤ Grpd` that on objects takes the core of a category * Define `CategoryTheory.Core.adjunction`: the adjunction with the forgetful functor `Grpd.forgetToCat` on the left, and the core functor `Core.functor` on the right. * Hence provide an instance that `Grpd.forgetToCat` is coreflective. - [ ] depends on: #29284 [Extra lemmas in CategoryTheory.Core] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict blocked-by-other-PR	104/4	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Core.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-55827 16 days ago	16-55827 16 days ago	0-3572 59 minutes
29790	robertmaxton42 author:robertmaxton42	feat (IsCoherentWith) : families of maps from a coherent collection of subspaces lift uniquely to maps from the total space	* Adds `IsCoherentWith.liftCover`, which lifts a compatible family of continuous maps from each member of a coherent set of subspaces to a single continuous map on the whole space. * Adds `IsCoherentWith.liftCover'`, which does the same but for a set of coherent subspaces given as the range of a function into `Set X` rather than as an explicit `Set (Set X).` - [ ] depends on: #29788 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	350/3	Mathlib/Data/Set/Subset.lean,Mathlib/Data/Set/UnionLift.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Coherent.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Basic.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	15-1469 15 days ago	15-2837 15 days ago	0-4627 1 hour
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: #xyz [optional extra text] --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor awaiting-author blocked-by-other-PR	70/3	Mathlib/Analysis/NormedSpace/HahnBanach/Separation.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/Topology/Order/OrderClosed.lean	3	14	['faenuccio', 'fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'mcdoll', 'themathqueen', 'yuanyi-350']	faenuccio assignee:faenuccio	8-69305 8 days ago	8-69307 8 days ago	21-29486 21 days
29942	smmercuri author:smmercuri	feat(InfinitePlace/Completion): embeddings of `w.Completion` factor through embeddings of `v.Completion` when `w` extends `v`	If `w : v.Extension L` is an extension of `v : InfinitePlace K` to `L`, then `extensionEmbedding w : L →+* ℂ` factors through `extensionEmbedding v : K →+* ℂ`. --- - [ ] depends on: #27978 - [ ] depends on: #29969 - [x] depends on: #29944 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT blocked-by-other-PR	199/58	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Completion.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean,Mathlib/Topology/MetricSpace/Completion.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	8-33440 8 days ago	9-37076 9 days ago	0-1122 18 minutes
29274	Jlh18 author:Jlh18	feat(CategoryTheory): HasLimits instance on Grpd	- Show that the quotient of a groupoid is a groupoid in `CategoryTheory.Quotient`. - Define the free groupoid on a category in `CategoryTheory.Category.FreeGroupoid` and hence define the free-forgetful adjunction between `Grpd` and `Cat`. - Use the free-forgetful adjunction to show that `Grpd` has all limits in `CategoryTheory.Category.Grpd.Limit`, as a reflective subcategory of `Cat`. - [ ] depends on: #29250[Renamings in Grpd file] - [ ] depends on: #29278[Quotient of a groupoid is a groupoid] - [ ] depends on: #29279[Free forgetful adjunction] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor blocked-by-other-PR	246/1	Mathlib.lean,Mathlib/CategoryTheory/Category/FreeGroupoid.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Limit.lean,Mathlib/CategoryTheory/Quotient.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-55072 4 days ago	4-55080 4 days ago	0-340 5 minutes
29000	JovanGerb author:JovanGerb	feat(Tactic/Push): add basic tags and tests	This PR adds basic `@[push]` tags, and expands the `push` test file. --- - [ ] depends on: #21965 - [ ] depends on: #30038 - [ ] depends on: #30039 - [ ] depends on: #30042 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	290/196	Archive/Imo/Imo1988Q6.lean,Archive/ZagierTwoSquares.lean,Counterexamples/Phillips.lean,Mathlib/Algebra/Group/Action/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/ListOfFn.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Order/Module/HahnEmbedding.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Oscillation.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/PosLog.lean,Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/Combinatorics/Colex.lean,Mathlib/Combinatorics/Enumerative/InclusionExclusion.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/Matroid/Dual.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Data/Analysis/Filter.lean,Mathlib/Data/Finset/BooleanAlgebra.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Empty.lean,Mathlib/Data/Finset/Filter.lean,Mathlib/Data/Finset/Insert.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Finset/SDiff.lean,Mathlib/Data/Finset/Sups.lean,Mathlib/Data/Finset/Union.lean,Mathlib/Data/Fintype/Defs.lean,Mathlib/Data/Nat/Cast/Basic.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/PrimeFin.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Data/Set/Prod.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/RootSystem/Base.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Order.lean,Mathlib/MeasureTheory/Constructions/Cylinders.lean,Mathlib/MeasureTheory/Constructions/Polish/Basic.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Finite.lean,Mathlib/MeasureTheory/SetAlgebra.lean,Mathlib/NumberTheory/AbelSummation.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/ModularForms/DedekindEta.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/CompleteLatticeIntervals.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/Interval/Set/Defs.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Order/PartialSups.lean,Mathlib/Order/SetNotation.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/Probability/Moments/ComplexMGF.lean,Mathlib/Probability/ProductMeasure.lean,Mathlib/RingTheory/HahnSeries/Summable.lean,Mathlib/RingTheory/Nilpotent/Defs.lean,Mathlib/Topology/Algebra/ProperAction/ProperlyDiscontinuous.lean,Mathlib/Topology/Bornology/BoundedOperation.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Compactness/Lindelof.lean,Mathlib/Topology/Connected/Clopen.lean,Mathlib/Topology/ContinuousMap/BoundedCompactlySupported.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean,Mathlib/Topology/GDelta/MetrizableSpace.lean,Mathlib/Topology/JacobsonSpace.lean,Mathlib/Topology/Order/Compact.lean,Mathlib/Topology/Order/HullKernel.lean,Mathlib/Topology/Perfect.lean,Mathlib/Topology/Sets/CompactOpenCovered.lean,MathlibTest/push.lean	87	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-33987 4 days ago	4-34259 4 days ago	4-45292 4 days
29948	mcdoll author:mcdoll	feat(Analysis/Fourier): The Fourier transform on L^2	--- - [ ] depends on: #29888 - [ ] depends on: #29860 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	600/118	Mathlib.lean,Mathlib/Analysis/Distribution/FourierSchwartz.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Fourier/FourierTransform.lean,Mathlib/Analysis/Fourier/L2Space.lean,Mathlib/Analysis/InnerProductSpace/Extend.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/Normed/Operator/Completeness.lean,Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,docs/undergrad.yaml	11	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-16884 4 days ago	4-16885 4 days ago	0-2667 44 minutes
29792	robertmaxton42 author:robertmaxton42	feat (RelCWComplex): a (relative, concrete) CW complex is the colimit of its skeleta	Adds: * `RelCWComplex.Subcomplex.isCoherentWith_cover`: a (relative) CW complex is coherent with any collection of subcomplexes that cover. * `RelCWComplex.descBySkeletonLT` and `descBySkeleton`: construct a continuous map from a complex by providing a family of compatible maps from each skeleton and the base. `CWComplex.descBySkeleton` skips the base. - [ ] depends on: #29788 - [ ] depends on: #29790 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	672/31	Mathlib/Data/Set/Subset.lean,Mathlib/Data/Set/UnionLift.lean,Mathlib/Topology/CWComplex/Classical/Basic.lean,Mathlib/Topology/CWComplex/Classical/Finite.lean,Mathlib/Topology/CWComplex/Classical/Subcomplex.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Coherent.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Basic.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'scholzhannah']	nobody	3-48079 3 days ago	15-5414 15 days ago	0-1375 22 minutes
29774	Raph-DG author:Raph-DG	feat(AlgebraicGeometry): Order of vanishing of elements of the function field of locally noetherian, integral schemes	In this PR, we define the order of vanishing of elements of the function field of locally noetherian, integral schemes at points of codimension 1. This is essentially just a wrapper around the API for the order of vanishing for rings (i.e. Ring.ord and Ring.ordFrac), but I think it's good to have this too for usability. --- - [ ] depends on: #29550 - [ ] depends on: #26735 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed blocked-by-other-PR	770/4	Mathlib.lean,Mathlib/AlgebraicGeometry/OrderOfVanishing.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/Order/KrullDimension.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/OrderOfVanishing/Basic.lean,Mathlib/RingTheory/OrderOfVanishing/Properties.lean,Mathlib/Topology/KrullDimension.lean	8	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-43006 3 days ago	3-43028 3 days ago	0-1197 19 minutes
29533	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): maximal Cohen Macaulay module	In this PR, we defined the concept of maximal Cohen Macaulay module, and proved that finitely generated maximal Cohen Macaulay module over regular local ring is free. --- - [ ] depends on: #28683 - [ ] depends on: #26218 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	3001/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/Support.lean	23	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-85165 23 hours ago	23-2842 23 days ago *	0-88 1 minute *
29557	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): finite projective dimension of regular	In this PR, we proved every finitely generated module over regular local ring has finite projective dimension. With this and Auslander Buchsbaum theorem, we can obtain the global dimension of regular local ring is equal to its krull dimension. --- - [ ] depends on: #29533 - [ ] depends on: #26215 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	3572/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/Support.lean	25	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-85124 23 hours ago	unknown	unknown
29534	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): global dimension of regular local ring	In this PR, we proved the global dimension of regular local ring is equal to its krull dimension via Auslander Buchsbaum theorem. --- - [ ] depends on: #29557 - [ ] depends on: #26215 - [ ] depends on: #29558 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	3832/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/Support.lean	26	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-84931 23 hours ago	unknown	unknown
29703	Thmoas-Guan author:Thmoas-Guan	feat(Algebra/RingTheory): Hilbert's Syzygy theorem (projective version)	In this PR, we proved for field `k`, `MvPolynomial (Fin n) k` has global dimension `n`. --- - [ ] depends on: #29701 - [ ] depends on: #29699 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	4532/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Polynomial.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Syzygy.lean,Mathlib/RingTheory/Support.lean	30	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-84615 23 hours ago	unknown	unknown
29699	Thmoas-Guan author:Thmoas-Guan	feat(Algebra/RingTheory) : Global dimension of regular ring	In this PR, we proved that the global (homological dimension) of regular ring is equal to its krull dimension. --- - [ ] depends on: #28684 - [ ] depends on: #29670 - [ ] depends on: #29534 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	4285/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/GlobalDimension.lean,Mathlib/RingTheory/Support.lean	28	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-83753 23 hours ago	unknown	unknown
29796	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory) : regular of finite global dimension	In this PR, we proved the other half of Auslander-Buchsbaum-Serre criterion, which states that a local ring is regular if it has finite global dimension, with results in #29557, we can obtain the full theorem. More APIs would be developed based on the two. --- - [ ] depends on: #26215 - [ ] depends on: #26217 - [ ] depends on: #29558 - [ ] depends on: #28683 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	3009/22	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/AuslanderBuchsbaumSerre.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean	16	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-83577 23 hours ago	unknown	unknown
29802	Thmoas-Guan author:Thmoas-Guan	feat(Algebra/RingTheory) : Auslander–Buchsbaum–Serre criterion and its corollaries	In this PR, we proved that: 1: The full version of Auslander–Buchsbaum–Serre criterion 2: Localization of regular local ring is regular 3: Global dimension finite implies regular (doesn't need local) 4: Regular ring only need to be verified at maximal ideals. --- - [ ] depends on: #29534 - [ ] depends on: #29699 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	5085/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/AuslanderBuchsbaumSerre.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/Localization.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Localization.lean,Mathlib/RingTheory/Support.lean	31	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-83555 23 hours ago	unknown	unknown

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