Are you a maintainer with just a short amount of time? The following kinds of pull requests could be relevant for you.
| 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 |
| 34633 |
mitchell-horner author:mitchell-horner |
feat(Combinatorics/SimpleGraph): define the Zarankiewicz function |
Defines the Zarankiewicz function $z(m, n; s, t)$ in terms of bipartite graphs.
---
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This comes from splitting up #25841 into smaller PRs.
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|
t-combinatorics
maintainer-merge
blocked-by-other-PR
|
247/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Zarankiewicz.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean |
4 |
30 |
['SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mitchell-horner'] |
nobody |
132-77734 4 months ago |
34-4923 34 days ago |
79-22945 79 days |
| 31141 |
peabrainiac author:peabrainiac |
feat(Analysis/Calculus): parametric integrals over smooth functions are smooth |
Show that for any smooth function `f : H × ℝ → E`, the parametric integral `fun x ↦ ∫ t in a..b, f (x, t) ∂μ` is smooth too.
The argument proceeds inductively, using the fact that derivatives of parametric integrals can themselves be computed as parametric integrals. The necessary lemmas on derivatives of parametric integrals already existed, but took some work to apply due to their generality; we state some convenient special cases.
---
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[](https://gitpod.io/from-referrer/)
|
t-analysis
awaiting-author
maintainer-merge
|
470/12 |
Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/Analysis/Calculus/ParametricIntervalIntegral.lean,Mathlib/MeasureTheory/Integral/DominatedConvergence.lean,Mathlib/Topology/NhdsWithin.lean,Mathlib/Topology/Separation/Regular.lean |
5 |
36 |
['fpvandoorn', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'peabrainiac', 'sgouezel'] |
j-loreaux assignee:j-loreaux |
122-50495 4 months ago |
122-50495 122 days ago |
33-85043 33 days |
| 37057 |
erdOne author:erdOne |
feat(AlgebraicTopology): `SimplexCategory.toTop_map_δ_apply` |
---
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|
t-algebraic-topology
maintainer-merge
awaiting-author
merge-conflict
|
48/2 |
Mathlib/AlgebraicTopology/CechNerve.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/TopologicalSimplex.lean,Mathlib/Data/Fin/SuccPred.lean |
5 |
17 |
['Raph-DG', 'dagurtomas', 'erdOne', 'github-actions', 'joelriou', 'mathlib-merge-conflicts', 'riccardobrasca'] |
robin-carlier assignee:robin-carlier |
66-69385 2 months ago |
68-30625 68 days ago |
4-49805 4 days |
| 37420 |
artie2000 author:artie2000 |
refactor: change definitions to avoid `ConvexCone` |
Change the definitions of `PointedCone.positive` and `PointedCone.closure` to avoid mentioning `ConvexCone`.
This PR is part of a series deprecating `ConvexCone`: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Replacing.20.60ConvexCone.60.20with.20.60PointedCone.60/with/582738985
---
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[](https://gitpod.io/from-referrer/)
|
t-convex-geometry
maintainer-merge
|
10/4 |
Mathlib/Analysis/Convex/Cone/Closure.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean |
2 |
3 |
['YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'ooovi', 'vihdzp'] |
nobody |
58-48979 1 month ago |
58-48943 58 days ago |
73-69317 73 days |
| 37603 |
Parcly-Taxel author:Parcly-Taxel |
refactor: review of `SetSemiring` |
* Rename `Set.up` and `SetSemiring.down` to `SetSemiring.ofSet` and `SetSemiring.toSet` respectively. Unprotect both and make them equivalences, following `FreeMonoid`.
* Derive `CompleteAtomicBooleanAlgebra` for `SetSemiring` immediately.
* Add `imageHom_id` and `imageHom_comp`. The three existing lemmas about `imageHom` are coalesced into `imageHom_apply`.
Ultimately inspired by https://github.com/leanprover-community/mathlib4/pull/36934#issuecomment-4183475568. |
maintainer-merge
merge-conflict
|
120/165 |
Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Data/Set/Semiring.lean |
2 |
42 |
['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'sgouezel'] |
nobody |
45-4563 1 month ago |
45-4564 45 days ago |
22-62470 22 days |
| 38358 |
yuanyi-350 author:yuanyi-350 |
doc(1000.yaml): note more formalised theorems |
---
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[](https://gitpod.io/from-referrer/)
|
documentation
maintainer-merge
|
9/2 |
docs/1000.yaml |
1 |
12 |
['YaelDillies', 'github-actions', 'grunweg', 'vihdzp', 'yuanyi-350'] |
nobody |
41-55981 1 month ago |
41-56043 41 days ago |
52-57510 52 days |
| 37053 |
artie2000 author:artie2000 |
refactor(Analysis/Convex/Cone): use `PointedCone` in Riesz extension theorem |
Change the statement of the Riesz extension theorem to take a `PointedCone` rather than a `ConvexCone`.
This PR is part of a series replacing `ConvexCone` with `PointedCone`. https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Replacing.20.60ConvexCone.60.20with.20.60PointedCone.60/near/581184307
---
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|
t-convex-geometry
maintainer-merge
merge-conflict
|
15/12 |
Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean |
2 |
9 |
['YaelDillies', 'artie2000', 'github-actions', 'mathlib-merge-conflicts', 'ocfnash'] |
nobody |
33-12776 1 month ago |
33-12777 33 days ago |
46-71615 46 days |
| 37928 |
AlexeyMilovanov author:AlexeyMilovanov |
refactor(Computability.Encoding): unbundle Γ and remove FinEncoding |
This PR unbundles the alphabet `Γ` from the `Encoding` structure and completely removes `FinEncoding`.
`Encoding`: The alphabet `Γ` is now an explicit parameter: `structure Encoding (α : Type u) (Γ : Type v)`.
`FinEncoding`: Removed. Finiteness is now handled via standard typeclasses (e.g., `[Fintype Γ] (e : Encoding α Γ)`).
Combinators: Functions like `finEncodingPair` are simplified to `encodingPair`, dropping the `fin` prefix and `[Fintype]` requirements where no longer needed.
Downstream: Mechanically updated `Mathlib.Computability` and `Mathlib.ModelTheory` to pass the explicit `Γ` and use `[Fintype Γ]` where `FinEncoding` was previously required.
|
new-contributor
maintainer-merge
|
87/67 |
Mathlib/Computability/Encoding.lean,Mathlib/ModelTheory/Encoding.lean |
2 |
9 |
['AlexeyMilovanov', 'dagurtomas', 'github-actions', 'vihdzp'] |
nobody |
31-5122 1 month ago |
37-56100 37 days ago |
63-35767 63 days |
| 37722 |
SabrinaJewson author:SabrinaJewson |
feat(Order/Cover): intervals equal singletons iff |
To complement `Set.Icc_eq_singleton_iff`, this introduces:
- `Set.Ioc_eq_singleton_iff` / `Set.Ico_eq_singleton_iff`
- `Set.Ico_eq_singleton_left_iff` / `Set.Ioc_eq_singleton_right_iff`
- `Set.Ioi_eq_singleton_iff` / `Set.Iio_eq_singleton_iff`
- `Set.Ioi_eq_singleton_top_iff` / `Set.Iio_eq_singleton_bot_iff`
- `Set.Ioo_eq_singleton_iff`
---
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|
t-order
new-contributor
awaiting-author
maintainer-merge
|
39/0 |
Mathlib/Order/Atoms.lean,Mathlib/Order/Cover.lean |
2 |
16 |
['Komyyy', 'SabrinaJewson', 'github-actions', 'mathlib-merge-conflicts'] |
bryangingechen assignee:bryangingechen |
30-24613 30 days ago |
32-63970 32 days ago |
35-12445 35 days |
| 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`.
---
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- [x] depends on: #27597
- [x] depends on: #27599
- [x] depends on: #28443
- [x] depends on: #28445
- [x] depends on: #28446
- [x] depends on: #28447
This is the first of several pull requests towards the full Erdős-Stone(-Simonovits) theorem, hence the name of the file.
[](https://gitpod.io/from-referrer/) |
t-combinatorics
maintainer-merge
|
329/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean |
2 |
19 |
['YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'mitchell-horner', 'robin-carlier'] |
nobody |
20-1534 20 days ago |
41-1671 41 days ago |
101-10224 101 days |
| 39693 |
yuanyi-350 author:yuanyi-350 |
feat(Combinatorics/Enumerative/Bell): sum over partition shapes |
Kill TODO in `Mathlib/Combinatorics/Enumerative/Bell.lean` which proves `Nat.bell` as a sum of `Multiset.bell` over partition shapes
---
Migrated from #37690
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|
t-combinatorics
maintainer-merge
|
128/35 |
Mathlib/Combinatorics/Enumerative/Bell.lean |
1 |
6 |
['YaelDillies', 'github-actions'] |
nobody |
18-56356 18 days ago |
22-52067 22 days ago |
22-51878 22 days |
| 39202 |
FordUniver author:FordUniver |
feat(Analysis/Calculus/Gradient): add `toDual_gradient` and companions |
Add `toDual_gradient`, `toDual_gradientWithin`, and the composed variants `toDual_comp_gradient`, `toDual_comp_gradientWithin` — the natural inverse direction of the gradient's defining equation `∇ f x := (toDual 𝕜 F).symm (fderiv 𝕜 f x)`. These identify `(toDual 𝕜 F) (∇ f x)` with `fderiv 𝕜 f x` (and the `gradientWithin` and composed forms with the corresponding fderiv versions), making the Riesz isomorphism between the two derivative views explicit. The proofs of `DifferentiableAt.hasGradientAt` and `DifferentiableWithinAt.hasGradientWithinAt` in the same file are simplified to use them.
Co-authored-by: Sebastian Pokutta <23001135+pokutta@users.noreply.github.com>
---
Came up while formalizing the descent lemma for Lipschitz-smooth functions, where being able to switch between `LipschitzWith K (fderiv ℝ f)` and `LipschitzWith K (∇ f)` is helpful, which with this PR becomes `toDual_comp_gradient ▸ (toDual ℝ F).isometry.lipschitzWith_iff K`. Also slightly simplifies two call sites in mathlib. |
maintainer-merge |
20/5 |
Mathlib/Analysis/Calculus/Gradient/Basic.lean |
1 |
5 |
['FordUniver', 'Komyyy', 'github-actions'] |
nobody |
16-50797 16 days ago |
33-39078 33 days ago |
33-39053 33 days |
| 39720 |
vihdzp author:vihdzp |
feat: cofinality within order |
We introduce `Order.cofWithin x = Order.cof (Iio x)` for the cofinality of an element within a preorder. This generalizes `Ordinal.cof`, with the caveat that `cof o : Cardinal.{u}` for `o : Ordinal.{u}`, whereas `cofWithin o : Cardinal.{u + 1}`.
---
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t-set-theory
maintainer-merge
|
104/14 |
Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality/Ordinal.lean |
3 |
11 |
['SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp'] |
alreadydone assignee:alreadydone |
13-86125 13 days ago |
18-73122 18 days ago |
22-12402 22 days |
| 36376 |
jessealama author:jessealama |
feat(SimpleGraph): hamiltonian cycle from cyclic permutation |
This PR provides `IsHamiltonian.of_perm`, a bridge from `Equiv.Perm.IsCycle` to `SimpleGraph.IsHamiltonian`: if σ is a permutation that is a single cycle with full support on at least 3 elements, and each step `v → σ v` is an edge of `G`, then `G` is Hamiltonian.
### New definitions and lemmas
**`Mathlib/Data/List/Chain.lean`**:
- `IsChain.iterate`: `List.iterate f a n` is a chain under `r` whenever `r a (f a)` holds for all `a`
**`Mathlib/Data/List/Iterate.lean`**:
- `getLast_iterate`: the last element of `List.iterate f a n` is `f^[n - 1] a`
**`Mathlib/Combinatorics/SimpleGraph/Walk/Iterate.lean`** (new file):
- `Walk.iterate`: builds a walk of length `n` from `x` to `f^[n] x` for any function `f` with `G.Adj x (f x)` for all `x`, defined via `Walk.ofSupport`
- `Walk.length_iterate`, `Walk.support_iterate`, `Walk.edges_iterate`: basic API
**`Mathlib/GroupTheory/Perm/Cycle/Basic.lean`**:
- `IsCycleOn.injOn_pow_apply`: the map `n ↦ (f ^ n) a` is injective on `Finset.range #s`
**`Mathlib/GroupTheory/Perm/Cycle/Concrete.lean`**:
- `IsCycleOn.injOn_sym2_pow_apply`: the unordered-pair edge map `k ↦ s((f ^ k) a, (f ^ (k + 1)) a)` is injective on `[0, #s)` when `#s ≠ 2`
- `IsCycleOn.sym2_pow_apply_ne`: edge distinctness for cycle-on permutations — `s((f ^ k) a, (f ^ (k + 1)) a) ≠ s(a, f a)` when `k ≠ 0`, `k < #s`, and `#s ≠ 2`
- `Perm.toList_eq_range_map_pow`: expresses `toList` as a range map over powers
**`Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean`**:
- `cons_isHamiltonianCycle_iff`: a Hamiltonian path closed by an edge outside its support is a Hamiltonian cycle, and conversely
- `IsHamiltonian.of_perm`: the main theorem
---
- [x] depends on: #36307 |
t-combinatorics
maintainer-merge
|
182/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian/Perm.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Iterate.lean,Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Iterate.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean |
8 |
78 |
['SnirBroshi', 'YaelDillies', 'github-actions', 'jessealama', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
b-mehta assignee:b-mehta |
12-85897 12 days ago |
25-67726 25 days ago |
70-876 70 days |
| 39136 |
vihdzp author:vihdzp |
feat: more results on `Order.enum` |
Most importantly, we prove that the enumerator function of a cofinal set is normal iff the set is closed (under non-empty suprema).
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|
t-set-theory
t-order
maintainer-merge
|
90/7 |
Mathlib/Order/Cofinal.lean,Mathlib/SetTheory/Cardinal/Cofinality/Club.lean,Mathlib/SetTheory/Cardinal/Cofinality/Enum.lean,Mathlib/SetTheory/Ordinal/Topology.lean |
4 |
7 |
['YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp'] |
nobody |
12-14015 12 days ago |
16-19150 16 days ago |
16-69275 16 days |
| 39975 |
gasparattila author:gasparattila |
chore: tag `(Continuous)LinearEquiv.prodCongr_symm` with `@[simp]` |
This is consistent with the other `prodCongr`s. Note that this also changes the type of `PiLp.sumPiLpEquivProdLpPiLp_symm_apply_ofLp`, which is now fully simplified.
---
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maintainer-merge |
5/5 |
Mathlib/LinearAlgebra/Prod.lean,Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean,Mathlib/Topology/Algebra/Module/Equiv.lean |
3 |
4 |
['github-actions', 'themathqueen'] |
nobody |
11-18840 11 days ago |
16-41146 16 days ago |
16-40957 16 days |
| 35753 |
Vilin97 author:Vilin97 |
feat(Topology/Algebra/Order): regular grid helpers and piecewise linear interpolation |
Make API for piecewise linear interpolation on regular grids. I need these to for ODE time-stepping methods, like forward Euler, and later Runge–Kutta methods.
Follow-up PR: #35755 (forward Euler method convergence).
I don't know if these numerical analysis ODE-solving methods even belong in mathlib. If someone could advise me on it, I would appreciate it.
---
The initial proof was produced by [Aristotle](https://aristotle.harmonic.fun). The code was iteratively refined (factoring out lemmas, golfing, simplifying proofs) using Claude Code.
- [ ] depends on: #38091 |
t-topology
new-contributor
LLM-generated
maintainer-merge
|
201/0 |
Mathlib.lean,Mathlib/Topology/Algebra/Order/PiecewiseLinear.lean |
2 |
59 |
['Vilin97', 'YanYablonovskiy', 'adomani', 'botbaki-review', 'copilot-pull-request-reviewer', 'dagurtomas', 'eric-wieser', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-dependent-issues', 'wwylele'] |
nobody |
10-1533 10 days ago |
43-12253 43 days ago |
75-61144 75 days |
| 39727 |
vihdzp author:vihdzp |
feat: stationary sets |
We define stationary sets as sets intersecting all club sets, and prove basic theorems about them.
---
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|
t-set-theory
maintainer-merge
|
154/22 |
Mathlib/Order/Cofinal.lean,Mathlib/SetTheory/Cardinal/Cofinality/Club.lean |
2 |
11 |
['YaelDillies', 'github-actions', 'plp127', 'vihdzp'] |
nobody |
9-54143 9 days ago |
9-54223 9 days ago |
22-6366 22 days |
| 37346 |
euprunin author:euprunin |
chore: golf using `grind` |
The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective.
Trace profiling results (differences <30 ms considered measurement noise):
* `✅️ SimpleGraph.Walk.IsPath.getVert_injOn`: unchanged 🎉
* `✅️ SimpleGraph.Walk.length_bypass_le`: unchanged 🎉
* `✅️ Rat.floor_intCast_div_natCast`: unchanged 🎉
* `✅️ InnerProductGeometry.norm_eq_of_angle_sub_eq_angle_sub_rev_of_angle_ne_pi`: unchanged 🎉
* `✅️ padicNorm.zero_of_padicNorm_eq_zero`: unchanged 🎉
Profiled using `set_option trace.profiler true in`.
---
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maintainer-merge
awaiting-zulip
merge-conflict
|
7/45 |
Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean |
4 |
23 |
['FernandoChu', 'bryangingechen', 'chenson2018', 'euprunin', 'faenuccio', 'github-actions', 'grunweg', 'mathlib-merge-conflicts'] |
nobody |
9-4129 9 days ago |
45-48258 45 days ago |
30-49603 30 days |
| 39122 |
justus-springer author:justus-springer |
feat(AlgebraicGeometry/Birational): Birationality and rationality of schemes |
This is a first step (of hopefully many) towards some basic birational geometry. This PR adds `Birational/Birational.lean`, which defines predicates `Birational`, `BirationalOver` and `IsRationalOver` for arbitrary schemes and provides basic API (e.g. that they are equivalence relations, and that affine space is rational).
Some notes on the choice of definitions: There are multiple ways to define what it means for
two schemes to be birational to each other. A common one is: "There exists a
rational map with a rational inverse". However, this would require defining composition of
rational maps, which is not always defined (In order to compose `f : X ⤏ Y` with `g : Y ⤏ Z`, you
need at least `X` preirreducible, `Y` nonempty and `f` dominant). On the other hand, I can define
"There exist dense subsets `U : Opens X` and `V : Opens Y` such that `U ≅ V` as schemes" for
any two schemes `X` and `Y`, with no conditions. Hence I chose that as a definition. I'm also
working on defining composition of rational maps (#39445), and once that's done, there should be a theorem
connecting the two definitions.
- [x] depends on: #39316
---
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|
t-algebraic-geometry
maintainer-merge
|
295/0 |
Mathlib.lean,Mathlib/AlgebraicGeometry/Birational/Birational.lean,Mathlib/AlgebraicGeometry/Restrict.lean |
3 |
31 |
['chrisflav', 'erdOne', 'github-actions', 'justus-springer', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
chrisflav and joelriou assignee:joelriou assignee:chrisflav |
8-24058 8 days ago |
8-43494 8 days ago |
30-11439 30 days |
| 37718 |
SabrinaJewson author:SabrinaJewson |
feat(Order): add conversions from `Std` order typeclasses to Mathlib ones |
`{Preorder, PartialOrder, LinearOrder}.ofStd` exist to facilitate convenient translation from `Std` order typeclasses to Mathlib ones.
The design is modelled closely after [`Init.Data.Order.PackageFactories`](https://leanprover-community.github.io/mathlib4_docs/Init/Data/Order/PackageFactories.html) (`Std.PreorderPackage` is equivalent-ish to Mathlib’s `Preorder`, and same for partial and linear orders). The `OfStdArgs` types allow conveniently bundling a whole bunch of default arguments together in a way that allows one default argument set to `extends` another.
---
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|
t-order
new-contributor
maintainer-merge
|
391/0 |
Mathlib.lean,Mathlib/Order/Std.lean,MathlibTest/OrderOfStd.lean |
3 |
9 |
['SabrinaJewson', 'YaelDillies', 'github-actions'] |
nobody |
7-30203 7 days ago |
23-8437 23 days ago |
68-2590 68 days |
| 40291 |
RemyDegenne author:RemyDegenne |
feat(Probability): add `HasCondDistrib` |
This PR adds a predicate that states that a random variable has a given conditional distribution given an other random variable.
From Lean Machine Learning.
Co-authored by: Paulo Rauber <pauloeduardorauber@gmail.com>
---
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|
t-measure-probability
LML
maintainer-merge
|
125/0 |
Mathlib.lean,Mathlib/Probability/HasCondDistrib.lean |
2 |
17 |
['EtienneC30', 'RemyDegenne', 'github-actions'] |
EtienneC30 assignee:EtienneC30 |
5-58101 5 days ago |
5-58881 5 days ago |
6-75096 6 days |
| 39956 |
SnirBroshi author:SnirBroshi |
feat(GroupTheory/IsPerfect): Grün's lemma |
Grün's lemma: In a perfect group (`commutator G = ⊤`), `center (G ⧸ center G) = ⊥`.
Also the `derivedSeries` and the `lowerCentralSeries` are a constant `⊤`, and the `upperCentralSeries` starts with `⊥` and afterwards is a constant `center G`.
---
[Wikipedia](https://en.wikipedia.org/wiki/Perfect_group#Gr.C3.BCn.27s_lemma)
[MathWorld](https://mathworld.wolfram.com/GruensLemma.html)
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|
t-group-theory
maintainer-merge
|
93/0 |
Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/GroupTheory/Commutator/Basic.lean,Mathlib/GroupTheory/IsPerfect.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/Subgroup/Centralizer.lean |
5 |
19 |
['SnirBroshi', 'github-actions', 'tb65536'] |
tb65536 assignee:tb65536 |
5-23461 5 days ago |
5-26016 5 days ago |
10-71471 10 days |
| 40074 |
TJHeeringa author:TJHeeringa |
feat(Analysis/InnerProductSpace/TensorProduct): Add TensorProduct.mapL |
This PR defines `TensorProduct.mapL`, the continuous version of `TensorProduct.map`.
---
`Analysis/innerProductSpace/TensorProduct` has a TODO for a continuous version of `TensorProduct.map`. One place which contains a proof for this is at [stack](https://math.stackexchange.com/a/3934668). #38755 was lemma 1 of that. This PR is the remainder.
AI:
Used to generate `exists_repr`.
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|
t-analysis
new-contributor
large-import
maintainer-merge
|
254/9 |
Mathlib/Analysis/InnerProductSpace/TensorProduct.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean |
2 |
70 |
['JonBannon', 'TJHeeringa', 'github-actions', 'themathqueen'] |
themathqueen assignee:themathqueen |
4-46184 4 days ago |
5-31397 5 days ago |
6-13307 6 days |
| 40327 |
grunweg author:grunweg |
perf: lower priority for IsSimpleGroup.toNontrivial instances |
These instances have very weak keys ([Nontrivial, *]), hence are always applied. Let's try lowering their priority.
---
Benchmarking results are [slightly positive](https://github.com/leanprover-community/mathlib4/pull/40304#issuecomment-4640304473), but could also be noise.
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|
t-group-theory
maintainer-merge
|
4/0 |
Mathlib/GroupTheory/Subgroup/Simple.lean |
1 |
5 |
['github-actions', 'grunweg', 'tb65536'] |
tb65536 assignee:tb65536 |
2-78560 2 days ago |
6-61864 6 days ago |
6-61675 6 days |
| 34909 |
SnirBroshi author:SnirBroshi |
feat(Data/Sym/Sym2): `fromRel` equivalence with `Sigma` over a `Quotient` |
Add a non-dependent recursor on members of a `fromRel` set, and the following `Equiv`s:
- The `fromRel` set of a symmetric relation `r` is equivalent to summing that set restricted to fibers of `f`.
- For a relation homomorphism `r →r r'` where `r` is symmetric, the `fromRel` set of `r` is equivalent to summing that set restricted to equivalence classes of `r'` using a `Subtype`.
---
I find this recursor pretty useful when dealing with `fromRel`, the idea came from a suggestion by @kmill [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Eq.2Erec.20with.20a.20constant.20does.20nothing.3A.20h.20.E2.96.B8.20c.20.3D.20c/near/565176948) for another `Sym2` conundrum.
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|
t-data
maintainer-merge
|
54/3 |
Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Data/Sym/Sym2.lean |
2 |
20 |
['SnirBroshi', 'bryangingechen', 'chrisflav', 'eric-wieser', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts'] |
eric-wieser assignee:eric-wieser |
2-77586 2 days ago |
2-79179 2 days ago |
101-53221 101 days |
| 39898 |
yuanyi-350 author:yuanyi-350 |
refactor(Analysis): golf `Mathlib/Analysis/Normed/Unbundled/AlgebraNorm` |
- refactors `Normed/Unbundled/AlgebraNorm` by using structure inheritance in `MulRingNorm.toRingNorm`
---
Extracted from #37968
[](https://gitpod.io/from-referrer/) |
codex
t-analysis
LLM-generated
maintainer-merge
|
2/5 |
Mathlib/Analysis/Normed/Unbundled/AlgebraNorm.lean |
1 |
10 |
['ADedecker', 'JonBannon', 'faenuccio', 'github-actions', 'j-loreaux', 'themathqueen', 'yuanyi-350'] |
nobody |
2-65186 2 days ago |
2-66000 2 days ago |
17-28608 17 days |
| 36155 |
grunweg author:grunweg |
feat: custom elaborators for TangentSpace and tangentMap(Within) |
And use these to golf the differential geometry files a bit further.
---
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|
t-differential-geometry
t-meta
maintainer-merge
merge-conflict
|
161/106 |
Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/Geometry/Manifold/IntegralCurve/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/NormedSpace.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/MFDeriv/Tangent.lean,Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Geometry/Manifold/Riemannian/Basic.lean,Mathlib/Geometry/Manifold/Riemannian/PathELength.lean,Mathlib/Topology/FiberBundle/Constructions.lean,MathlibTest/DifferentialGeometry/Notation/Basic.lean |
11 |
24 |
['JovanGerb', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'ocfnash'] |
JovanGerb assignee:JovanGerb |
2-15456 2 days ago |
2-15456 2 days ago |
81-31050 81 days |
| 40138 |
faenuccio author:faenuccio |
doc: fix the doc of two files about group actions |
|
documentation
t-group-theory
maintainer-merge
|
146/144 |
Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Schreier.lean |
2 |
31 |
['adomani', 'b-mehta', 'eric-wieser', 'faenuccio', 'github-actions', 'grunweg', 'jcommelin', 'tb65536'] |
tb65536 assignee:tb65536 |
1-70851 1 day ago |
4-81880 4 days ago |
6-55863 6 days |
| 35394 |
HugLycan author:HugLycan |
feat(Tactic/Positivity): make positivity work for types that are not partial orders |
Make positivity work for types that are not partial orders
Most PositivityExt haven't been updated for non partial order cases yet. They will be updated in the later PR.
`Strictness` now depends on `Option Q(PartialOrder $α)` instead of `Q(PartialOrder $α)`, and the constructors `Strictness.positive`/`Strictness.nonnegative` now have their `Q(PartialOrder $α)` typeclass arguments.
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-meta
maintainer-merge
|
612/354 |
Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Algebra/Order/Algebra.lean,Mathlib/Algebra/Order/BigOperators/Expect.lean,Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Field/Power.lean,Mathlib/Algebra/Order/Floor/Extended.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Module/Field.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/Order.lean,Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Real/Sqrt.lean,Mathlib/Analysis/SpecialFunctions/Bernstein.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.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/DerivHyp.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Bound.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Removal.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Real.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/EReal/Inv.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/Factorial/DoubleFactorial.lean,Mathlib/Data/Nat/Totient.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/Geometry/Euclidean/Altitude.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Measure/Real.lean,Mathlib/NumberTheory/ArithmeticFunction/Misc.lean,Mathlib/NumberTheory/ArithmeticFunction/Zeta.lean,Mathlib/NumberTheory/Height/Basic.lean,Mathlib/NumberTheory/Height/NumberField.lean,Mathlib/NumberTheory/Height/Projectivization.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/NumberTheory/SelbergSieve.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Positivity/Finset.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean,MathlibTest/positivity.lean |
54 |
94 |
['HugLycan', 'JovanGerb', 'Vierkantor', 'fpvandoorn', 'github-actions', 'joneugster', 'leanprover-radar', 'mathlib-merge-conflicts'] |
dwrensha assignee:dwrensha |
1-16990 1 day ago |
1-45263 1 day ago |
64-45258 64 days |
| 39903 |
akiezun author:akiezun |
feat(NumberTheory): add almost prime numbers |
Adds Nat.IsAlmostPrime k n for natural numbers with exactly k prime factors counted with multiplicity, plus
Nat.IsAtMostAlmostPrime and Nat.IsSemiprime. The definitions reuse the existing arithmetic function Ω, and the initial
API proves the basic zero/one cases, prime examples, and closure under multiplication.
---
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|
new-contributor
t-number-theory
maintainer-merge
merge-conflict
|
87/0 |
Mathlib.lean,Mathlib/NumberTheory/AlmostPrime.lean |
2 |
9 |
['SnirBroshi', 'akiezun', 'github-actions', 'loefflerd', 'mathlib-merge-conflicts', 'riccardobrasca', 'vihdzp'] |
loefflerd assignee:loefflerd |
1-7647 1 day ago |
1-7648 1 day ago |
16-81193 16 days |
| 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 |
| 34633 |
mitchell-horner author:mitchell-horner |
feat(Combinatorics/SimpleGraph): define the Zarankiewicz function |
Defines the Zarankiewicz function $z(m, n; s, t)$ in terms of bipartite graphs.
---
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|
t-combinatorics
maintainer-merge
blocked-by-other-PR
|
247/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Zarankiewicz.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean |
4 |
30 |
['SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mitchell-horner'] |
nobody |
132-77734 4 months ago |
34-4923 34 days ago |
79-22945 79 days |
| 31141 |
peabrainiac author:peabrainiac |
feat(Analysis/Calculus): parametric integrals over smooth functions are smooth |
Show that for any smooth function `f : H × ℝ → E`, the parametric integral `fun x ↦ ∫ t in a..b, f (x, t) ∂μ` is smooth too.
The argument proceeds inductively, using the fact that derivatives of parametric integrals can themselves be computed as parametric integrals. The necessary lemmas on derivatives of parametric integrals already existed, but took some work to apply due to their generality; we state some convenient special cases.
---
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|
t-analysis
awaiting-author
maintainer-merge
|
470/12 |
Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/Analysis/Calculus/ParametricIntervalIntegral.lean,Mathlib/MeasureTheory/Integral/DominatedConvergence.lean,Mathlib/Topology/NhdsWithin.lean,Mathlib/Topology/Separation/Regular.lean |
5 |
36 |
['fpvandoorn', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'peabrainiac', 'sgouezel'] |
j-loreaux assignee:j-loreaux |
122-50495 4 months ago |
122-50495 122 days ago |
33-85043 33 days |
| 37057 |
erdOne author:erdOne |
feat(AlgebraicTopology): `SimplexCategory.toTop_map_δ_apply` |
---
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|
t-algebraic-topology
maintainer-merge
awaiting-author
merge-conflict
|
48/2 |
Mathlib/AlgebraicTopology/CechNerve.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/TopologicalSimplex.lean,Mathlib/Data/Fin/SuccPred.lean |
5 |
17 |
['Raph-DG', 'dagurtomas', 'erdOne', 'github-actions', 'joelriou', 'mathlib-merge-conflicts', 'riccardobrasca'] |
robin-carlier assignee:robin-carlier |
66-69385 2 months ago |
68-30625 68 days ago |
4-49805 4 days |
| 37420 |
artie2000 author:artie2000 |
refactor: change definitions to avoid `ConvexCone` |
Change the definitions of `PointedCone.positive` and `PointedCone.closure` to avoid mentioning `ConvexCone`.
This PR is part of a series deprecating `ConvexCone`: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Replacing.20.60ConvexCone.60.20with.20.60PointedCone.60/with/582738985
---
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|
t-convex-geometry
maintainer-merge
|
10/4 |
Mathlib/Analysis/Convex/Cone/Closure.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean |
2 |
3 |
['YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'ooovi', 'vihdzp'] |
nobody |
58-48979 1 month ago |
58-48943 58 days ago |
73-69317 73 days |
| 37603 |
Parcly-Taxel author:Parcly-Taxel |
refactor: review of `SetSemiring` |
* Rename `Set.up` and `SetSemiring.down` to `SetSemiring.ofSet` and `SetSemiring.toSet` respectively. Unprotect both and make them equivalences, following `FreeMonoid`.
* Derive `CompleteAtomicBooleanAlgebra` for `SetSemiring` immediately.
* Add `imageHom_id` and `imageHom_comp`. The three existing lemmas about `imageHom` are coalesced into `imageHom_apply`.
Ultimately inspired by https://github.com/leanprover-community/mathlib4/pull/36934#issuecomment-4183475568. |
maintainer-merge
merge-conflict
|
120/165 |
Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Data/Set/Semiring.lean |
2 |
42 |
['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'sgouezel'] |
nobody |
45-4563 1 month ago |
45-4564 45 days ago |
22-62470 22 days |
| 38358 |
yuanyi-350 author:yuanyi-350 |
doc(1000.yaml): note more formalised theorems |
---
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|
documentation
maintainer-merge
|
9/2 |
docs/1000.yaml |
1 |
12 |
['YaelDillies', 'github-actions', 'grunweg', 'vihdzp', 'yuanyi-350'] |
nobody |
41-55981 1 month ago |
41-56043 41 days ago |
52-57510 52 days |
| 37053 |
artie2000 author:artie2000 |
refactor(Analysis/Convex/Cone): use `PointedCone` in Riesz extension theorem |
Change the statement of the Riesz extension theorem to take a `PointedCone` rather than a `ConvexCone`.
This PR is part of a series replacing `ConvexCone` with `PointedCone`. https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Replacing.20.60ConvexCone.60.20with.20.60PointedCone.60/near/581184307
---
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|
t-convex-geometry
maintainer-merge
merge-conflict
|
15/12 |
Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean |
2 |
9 |
['YaelDillies', 'artie2000', 'github-actions', 'mathlib-merge-conflicts', 'ocfnash'] |
nobody |
33-12776 1 month ago |
33-12777 33 days ago |
46-71615 46 days |
| 37928 |
AlexeyMilovanov author:AlexeyMilovanov |
refactor(Computability.Encoding): unbundle Γ and remove FinEncoding |
This PR unbundles the alphabet `Γ` from the `Encoding` structure and completely removes `FinEncoding`.
`Encoding`: The alphabet `Γ` is now an explicit parameter: `structure Encoding (α : Type u) (Γ : Type v)`.
`FinEncoding`: Removed. Finiteness is now handled via standard typeclasses (e.g., `[Fintype Γ] (e : Encoding α Γ)`).
Combinators: Functions like `finEncodingPair` are simplified to `encodingPair`, dropping the `fin` prefix and `[Fintype]` requirements where no longer needed.
Downstream: Mechanically updated `Mathlib.Computability` and `Mathlib.ModelTheory` to pass the explicit `Γ` and use `[Fintype Γ]` where `FinEncoding` was previously required.
|
new-contributor
maintainer-merge
|
87/67 |
Mathlib/Computability/Encoding.lean,Mathlib/ModelTheory/Encoding.lean |
2 |
9 |
['AlexeyMilovanov', 'dagurtomas', 'github-actions', 'vihdzp'] |
nobody |
31-5122 1 month ago |
37-56100 37 days ago |
63-35767 63 days |
| 37722 |
SabrinaJewson author:SabrinaJewson |
feat(Order/Cover): intervals equal singletons iff |
To complement `Set.Icc_eq_singleton_iff`, this introduces:
- `Set.Ioc_eq_singleton_iff` / `Set.Ico_eq_singleton_iff`
- `Set.Ico_eq_singleton_left_iff` / `Set.Ioc_eq_singleton_right_iff`
- `Set.Ioi_eq_singleton_iff` / `Set.Iio_eq_singleton_iff`
- `Set.Ioi_eq_singleton_top_iff` / `Set.Iio_eq_singleton_bot_iff`
- `Set.Ioo_eq_singleton_iff`
---
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|
t-order
new-contributor
awaiting-author
maintainer-merge
|
39/0 |
Mathlib/Order/Atoms.lean,Mathlib/Order/Cover.lean |
2 |
16 |
['Komyyy', 'SabrinaJewson', 'github-actions', 'mathlib-merge-conflicts'] |
bryangingechen assignee:bryangingechen |
30-24613 30 days ago |
32-63970 32 days ago |
35-12445 35 days |
| 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`.
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- [x] depends on: #28445
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- [x] depends on: #28447
This is the first of several pull requests towards the full Erdős-Stone(-Simonovits) theorem, hence the name of the file.
[](https://gitpod.io/from-referrer/) |
t-combinatorics
maintainer-merge
|
329/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean |
2 |
19 |
['YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'mitchell-horner', 'robin-carlier'] |
nobody |
20-1534 20 days ago |
41-1671 41 days ago |
101-10224 101 days |
| 39693 |
yuanyi-350 author:yuanyi-350 |
feat(Combinatorics/Enumerative/Bell): sum over partition shapes |
Kill TODO in `Mathlib/Combinatorics/Enumerative/Bell.lean` which proves `Nat.bell` as a sum of `Multiset.bell` over partition shapes
---
Migrated from #37690
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t-combinatorics
maintainer-merge
|
128/35 |
Mathlib/Combinatorics/Enumerative/Bell.lean |
1 |
6 |
['YaelDillies', 'github-actions'] |
nobody |
18-56356 18 days ago |
22-52067 22 days ago |
22-51878 22 days |
| 39202 |
FordUniver author:FordUniver |
feat(Analysis/Calculus/Gradient): add `toDual_gradient` and companions |
Add `toDual_gradient`, `toDual_gradientWithin`, and the composed variants `toDual_comp_gradient`, `toDual_comp_gradientWithin` — the natural inverse direction of the gradient's defining equation `∇ f x := (toDual 𝕜 F).symm (fderiv 𝕜 f x)`. These identify `(toDual 𝕜 F) (∇ f x)` with `fderiv 𝕜 f x` (and the `gradientWithin` and composed forms with the corresponding fderiv versions), making the Riesz isomorphism between the two derivative views explicit. The proofs of `DifferentiableAt.hasGradientAt` and `DifferentiableWithinAt.hasGradientWithinAt` in the same file are simplified to use them.
Co-authored-by: Sebastian Pokutta <23001135+pokutta@users.noreply.github.com>
---
Came up while formalizing the descent lemma for Lipschitz-smooth functions, where being able to switch between `LipschitzWith K (fderiv ℝ f)` and `LipschitzWith K (∇ f)` is helpful, which with this PR becomes `toDual_comp_gradient ▸ (toDual ℝ F).isometry.lipschitzWith_iff K`. Also slightly simplifies two call sites in mathlib. |
maintainer-merge |
20/5 |
Mathlib/Analysis/Calculus/Gradient/Basic.lean |
1 |
5 |
['FordUniver', 'Komyyy', 'github-actions'] |
nobody |
16-50797 16 days ago |
33-39078 33 days ago |
33-39053 33 days |
| 39720 |
vihdzp author:vihdzp |
feat: cofinality within order |
We introduce `Order.cofWithin x = Order.cof (Iio x)` for the cofinality of an element within a preorder. This generalizes `Ordinal.cof`, with the caveat that `cof o : Cardinal.{u}` for `o : Ordinal.{u}`, whereas `cofWithin o : Cardinal.{u + 1}`.
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t-set-theory
maintainer-merge
|
104/14 |
Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality/Ordinal.lean |
3 |
11 |
['SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp'] |
alreadydone assignee:alreadydone |
13-86125 13 days ago |
18-73122 18 days ago |
22-12402 22 days |
| 36376 |
jessealama author:jessealama |
feat(SimpleGraph): hamiltonian cycle from cyclic permutation |
This PR provides `IsHamiltonian.of_perm`, a bridge from `Equiv.Perm.IsCycle` to `SimpleGraph.IsHamiltonian`: if σ is a permutation that is a single cycle with full support on at least 3 elements, and each step `v → σ v` is an edge of `G`, then `G` is Hamiltonian.
### New definitions and lemmas
**`Mathlib/Data/List/Chain.lean`**:
- `IsChain.iterate`: `List.iterate f a n` is a chain under `r` whenever `r a (f a)` holds for all `a`
**`Mathlib/Data/List/Iterate.lean`**:
- `getLast_iterate`: the last element of `List.iterate f a n` is `f^[n - 1] a`
**`Mathlib/Combinatorics/SimpleGraph/Walk/Iterate.lean`** (new file):
- `Walk.iterate`: builds a walk of length `n` from `x` to `f^[n] x` for any function `f` with `G.Adj x (f x)` for all `x`, defined via `Walk.ofSupport`
- `Walk.length_iterate`, `Walk.support_iterate`, `Walk.edges_iterate`: basic API
**`Mathlib/GroupTheory/Perm/Cycle/Basic.lean`**:
- `IsCycleOn.injOn_pow_apply`: the map `n ↦ (f ^ n) a` is injective on `Finset.range #s`
**`Mathlib/GroupTheory/Perm/Cycle/Concrete.lean`**:
- `IsCycleOn.injOn_sym2_pow_apply`: the unordered-pair edge map `k ↦ s((f ^ k) a, (f ^ (k + 1)) a)` is injective on `[0, #s)` when `#s ≠ 2`
- `IsCycleOn.sym2_pow_apply_ne`: edge distinctness for cycle-on permutations — `s((f ^ k) a, (f ^ (k + 1)) a) ≠ s(a, f a)` when `k ≠ 0`, `k < #s`, and `#s ≠ 2`
- `Perm.toList_eq_range_map_pow`: expresses `toList` as a range map over powers
**`Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean`**:
- `cons_isHamiltonianCycle_iff`: a Hamiltonian path closed by an edge outside its support is a Hamiltonian cycle, and conversely
- `IsHamiltonian.of_perm`: the main theorem
---
- [x] depends on: #36307 |
t-combinatorics
maintainer-merge
|
182/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian/Perm.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Iterate.lean,Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Iterate.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean |
8 |
78 |
['SnirBroshi', 'YaelDillies', 'github-actions', 'jessealama', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
b-mehta assignee:b-mehta |
12-85897 12 days ago |
25-67726 25 days ago |
70-876 70 days |
| 39136 |
vihdzp author:vihdzp |
feat: more results on `Order.enum` |
Most importantly, we prove that the enumerator function of a cofinal set is normal iff the set is closed (under non-empty suprema).
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t-set-theory
t-order
maintainer-merge
|
90/7 |
Mathlib/Order/Cofinal.lean,Mathlib/SetTheory/Cardinal/Cofinality/Club.lean,Mathlib/SetTheory/Cardinal/Cofinality/Enum.lean,Mathlib/SetTheory/Ordinal/Topology.lean |
4 |
7 |
['YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp'] |
nobody |
12-14015 12 days ago |
16-19150 16 days ago |
16-69275 16 days |
| 39975 |
gasparattila author:gasparattila |
chore: tag `(Continuous)LinearEquiv.prodCongr_symm` with `@[simp]` |
This is consistent with the other `prodCongr`s. Note that this also changes the type of `PiLp.sumPiLpEquivProdLpPiLp_symm_apply_ofLp`, which is now fully simplified.
---
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maintainer-merge |
5/5 |
Mathlib/LinearAlgebra/Prod.lean,Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean,Mathlib/Topology/Algebra/Module/Equiv.lean |
3 |
4 |
['github-actions', 'themathqueen'] |
nobody |
11-18840 11 days ago |
16-41146 16 days ago |
16-40957 16 days |
| 35753 |
Vilin97 author:Vilin97 |
feat(Topology/Algebra/Order): regular grid helpers and piecewise linear interpolation |
Make API for piecewise linear interpolation on regular grids. I need these to for ODE time-stepping methods, like forward Euler, and later Runge–Kutta methods.
Follow-up PR: #35755 (forward Euler method convergence).
I don't know if these numerical analysis ODE-solving methods even belong in mathlib. If someone could advise me on it, I would appreciate it.
---
The initial proof was produced by [Aristotle](https://aristotle.harmonic.fun). The code was iteratively refined (factoring out lemmas, golfing, simplifying proofs) using Claude Code.
- [ ] depends on: #38091 |
t-topology
new-contributor
LLM-generated
maintainer-merge
|
201/0 |
Mathlib.lean,Mathlib/Topology/Algebra/Order/PiecewiseLinear.lean |
2 |
59 |
['Vilin97', 'YanYablonovskiy', 'adomani', 'botbaki-review', 'copilot-pull-request-reviewer', 'dagurtomas', 'eric-wieser', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-dependent-issues', 'wwylele'] |
nobody |
10-1533 10 days ago |
43-12253 43 days ago |
75-61144 75 days |
| 39727 |
vihdzp author:vihdzp |
feat: stationary sets |
We define stationary sets as sets intersecting all club sets, and prove basic theorems about them.
---
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t-set-theory
maintainer-merge
|
154/22 |
Mathlib/Order/Cofinal.lean,Mathlib/SetTheory/Cardinal/Cofinality/Club.lean |
2 |
11 |
['YaelDillies', 'github-actions', 'plp127', 'vihdzp'] |
nobody |
9-54143 9 days ago |
9-54223 9 days ago |
22-6366 22 days |
| 37346 |
euprunin author:euprunin |
chore: golf using `grind` |
The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective.
Trace profiling results (differences <30 ms considered measurement noise):
* `✅️ SimpleGraph.Walk.IsPath.getVert_injOn`: unchanged 🎉
* `✅️ SimpleGraph.Walk.length_bypass_le`: unchanged 🎉
* `✅️ Rat.floor_intCast_div_natCast`: unchanged 🎉
* `✅️ InnerProductGeometry.norm_eq_of_angle_sub_eq_angle_sub_rev_of_angle_ne_pi`: unchanged 🎉
* `✅️ padicNorm.zero_of_padicNorm_eq_zero`: unchanged 🎉
Profiled using `set_option trace.profiler true in`.
---
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maintainer-merge
awaiting-zulip
merge-conflict
|
7/45 |
Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean |
4 |
23 |
['FernandoChu', 'bryangingechen', 'chenson2018', 'euprunin', 'faenuccio', 'github-actions', 'grunweg', 'mathlib-merge-conflicts'] |
nobody |
9-4129 9 days ago |
45-48258 45 days ago |
30-49603 30 days |
| 39122 |
justus-springer author:justus-springer |
feat(AlgebraicGeometry/Birational): Birationality and rationality of schemes |
This is a first step (of hopefully many) towards some basic birational geometry. This PR adds `Birational/Birational.lean`, which defines predicates `Birational`, `BirationalOver` and `IsRationalOver` for arbitrary schemes and provides basic API (e.g. that they are equivalence relations, and that affine space is rational).
Some notes on the choice of definitions: There are multiple ways to define what it means for
two schemes to be birational to each other. A common one is: "There exists a
rational map with a rational inverse". However, this would require defining composition of
rational maps, which is not always defined (In order to compose `f : X ⤏ Y` with `g : Y ⤏ Z`, you
need at least `X` preirreducible, `Y` nonempty and `f` dominant). On the other hand, I can define
"There exist dense subsets `U : Opens X` and `V : Opens Y` such that `U ≅ V` as schemes" for
any two schemes `X` and `Y`, with no conditions. Hence I chose that as a definition. I'm also
working on defining composition of rational maps (#39445), and once that's done, there should be a theorem
connecting the two definitions.
- [x] depends on: #39316
---
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|
t-algebraic-geometry
maintainer-merge
|
295/0 |
Mathlib.lean,Mathlib/AlgebraicGeometry/Birational/Birational.lean,Mathlib/AlgebraicGeometry/Restrict.lean |
3 |
31 |
['chrisflav', 'erdOne', 'github-actions', 'justus-springer', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
chrisflav and joelriou assignee:joelriou assignee:chrisflav |
8-24058 8 days ago |
8-43494 8 days ago |
30-11439 30 days |
| 37718 |
SabrinaJewson author:SabrinaJewson |
feat(Order): add conversions from `Std` order typeclasses to Mathlib ones |
`{Preorder, PartialOrder, LinearOrder}.ofStd` exist to facilitate convenient translation from `Std` order typeclasses to Mathlib ones.
The design is modelled closely after [`Init.Data.Order.PackageFactories`](https://leanprover-community.github.io/mathlib4_docs/Init/Data/Order/PackageFactories.html) (`Std.PreorderPackage` is equivalent-ish to Mathlib’s `Preorder`, and same for partial and linear orders). The `OfStdArgs` types allow conveniently bundling a whole bunch of default arguments together in a way that allows one default argument set to `extends` another.
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|
t-order
new-contributor
maintainer-merge
|
391/0 |
Mathlib.lean,Mathlib/Order/Std.lean,MathlibTest/OrderOfStd.lean |
3 |
9 |
['SabrinaJewson', 'YaelDillies', 'github-actions'] |
nobody |
7-30203 7 days ago |
23-8437 23 days ago |
68-2590 68 days |
| 40291 |
RemyDegenne author:RemyDegenne |
feat(Probability): add `HasCondDistrib` |
This PR adds a predicate that states that a random variable has a given conditional distribution given an other random variable.
From Lean Machine Learning.
Co-authored by: Paulo Rauber <pauloeduardorauber@gmail.com>
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|
t-measure-probability
LML
maintainer-merge
|
125/0 |
Mathlib.lean,Mathlib/Probability/HasCondDistrib.lean |
2 |
17 |
['EtienneC30', 'RemyDegenne', 'github-actions'] |
EtienneC30 assignee:EtienneC30 |
5-58101 5 days ago |
5-58881 5 days ago |
6-75096 6 days |
| 39956 |
SnirBroshi author:SnirBroshi |
feat(GroupTheory/IsPerfect): Grün's lemma |
Grün's lemma: In a perfect group (`commutator G = ⊤`), `center (G ⧸ center G) = ⊥`.
Also the `derivedSeries` and the `lowerCentralSeries` are a constant `⊤`, and the `upperCentralSeries` starts with `⊥` and afterwards is a constant `center G`.
---
[Wikipedia](https://en.wikipedia.org/wiki/Perfect_group#Gr.C3.BCn.27s_lemma)
[MathWorld](https://mathworld.wolfram.com/GruensLemma.html)
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|
t-group-theory
maintainer-merge
|
93/0 |
Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/GroupTheory/Commutator/Basic.lean,Mathlib/GroupTheory/IsPerfect.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/Subgroup/Centralizer.lean |
5 |
19 |
['SnirBroshi', 'github-actions', 'tb65536'] |
tb65536 assignee:tb65536 |
5-23461 5 days ago |
5-26016 5 days ago |
10-71471 10 days |
| 40074 |
TJHeeringa author:TJHeeringa |
feat(Analysis/InnerProductSpace/TensorProduct): Add TensorProduct.mapL |
This PR defines `TensorProduct.mapL`, the continuous version of `TensorProduct.map`.
---
`Analysis/innerProductSpace/TensorProduct` has a TODO for a continuous version of `TensorProduct.map`. One place which contains a proof for this is at [stack](https://math.stackexchange.com/a/3934668). #38755 was lemma 1 of that. This PR is the remainder.
AI:
Used to generate `exists_repr`.
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|
t-analysis
new-contributor
large-import
maintainer-merge
|
254/9 |
Mathlib/Analysis/InnerProductSpace/TensorProduct.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean |
2 |
70 |
['JonBannon', 'TJHeeringa', 'github-actions', 'themathqueen'] |
themathqueen assignee:themathqueen |
4-46184 4 days ago |
5-31397 5 days ago |
6-13307 6 days |
| 40327 |
grunweg author:grunweg |
perf: lower priority for IsSimpleGroup.toNontrivial instances |
These instances have very weak keys ([Nontrivial, *]), hence are always applied. Let's try lowering their priority.
---
Benchmarking results are [slightly positive](https://github.com/leanprover-community/mathlib4/pull/40304#issuecomment-4640304473), but could also be noise.
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|
t-group-theory
maintainer-merge
|
4/0 |
Mathlib/GroupTheory/Subgroup/Simple.lean |
1 |
5 |
['github-actions', 'grunweg', 'tb65536'] |
tb65536 assignee:tb65536 |
2-78560 2 days ago |
6-61864 6 days ago |
6-61675 6 days |
| 34909 |
SnirBroshi author:SnirBroshi |
feat(Data/Sym/Sym2): `fromRel` equivalence with `Sigma` over a `Quotient` |
Add a non-dependent recursor on members of a `fromRel` set, and the following `Equiv`s:
- The `fromRel` set of a symmetric relation `r` is equivalent to summing that set restricted to fibers of `f`.
- For a relation homomorphism `r →r r'` where `r` is symmetric, the `fromRel` set of `r` is equivalent to summing that set restricted to equivalence classes of `r'` using a `Subtype`.
---
I find this recursor pretty useful when dealing with `fromRel`, the idea came from a suggestion by @kmill [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Eq.2Erec.20with.20a.20constant.20does.20nothing.3A.20h.20.E2.96.B8.20c.20.3D.20c/near/565176948) for another `Sym2` conundrum.
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|
t-data
maintainer-merge
|
54/3 |
Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Data/Sym/Sym2.lean |
2 |
20 |
['SnirBroshi', 'bryangingechen', 'chrisflav', 'eric-wieser', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts'] |
eric-wieser assignee:eric-wieser |
2-77586 2 days ago |
2-79179 2 days ago |
101-53221 101 days |
| 39898 |
yuanyi-350 author:yuanyi-350 |
refactor(Analysis): golf `Mathlib/Analysis/Normed/Unbundled/AlgebraNorm` |
- refactors `Normed/Unbundled/AlgebraNorm` by using structure inheritance in `MulRingNorm.toRingNorm`
---
Extracted from #37968
[](https://gitpod.io/from-referrer/) |
codex
t-analysis
LLM-generated
maintainer-merge
|
2/5 |
Mathlib/Analysis/Normed/Unbundled/AlgebraNorm.lean |
1 |
10 |
['ADedecker', 'JonBannon', 'faenuccio', 'github-actions', 'j-loreaux', 'themathqueen', 'yuanyi-350'] |
nobody |
2-65186 2 days ago |
2-66000 2 days ago |
17-28608 17 days |
| 36155 |
grunweg author:grunweg |
feat: custom elaborators for TangentSpace and tangentMap(Within) |
And use these to golf the differential geometry files a bit further.
---
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|
t-differential-geometry
t-meta
maintainer-merge
merge-conflict
|
161/106 |
Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/Geometry/Manifold/IntegralCurve/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/NormedSpace.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/MFDeriv/Tangent.lean,Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Geometry/Manifold/Riemannian/Basic.lean,Mathlib/Geometry/Manifold/Riemannian/PathELength.lean,Mathlib/Topology/FiberBundle/Constructions.lean,MathlibTest/DifferentialGeometry/Notation/Basic.lean |
11 |
24 |
['JovanGerb', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'ocfnash'] |
JovanGerb assignee:JovanGerb |
2-15456 2 days ago |
2-15456 2 days ago |
81-31050 81 days |
| 40138 |
faenuccio author:faenuccio |
doc: fix the doc of two files about group actions |
|
documentation
t-group-theory
maintainer-merge
|
146/144 |
Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Schreier.lean |
2 |
31 |
['adomani', 'b-mehta', 'eric-wieser', 'faenuccio', 'github-actions', 'grunweg', 'jcommelin', 'tb65536'] |
tb65536 assignee:tb65536 |
1-70851 1 day ago |
4-81880 4 days ago |
6-55863 6 days |
| 35394 |
HugLycan author:HugLycan |
feat(Tactic/Positivity): make positivity work for types that are not partial orders |
Make positivity work for types that are not partial orders
Most PositivityExt haven't been updated for non partial order cases yet. They will be updated in the later PR.
`Strictness` now depends on `Option Q(PartialOrder $α)` instead of `Q(PartialOrder $α)`, and the constructors `Strictness.positive`/`Strictness.nonnegative` now have their `Q(PartialOrder $α)` typeclass arguments.
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-meta
maintainer-merge
|
612/354 |
Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Algebra/Order/Algebra.lean,Mathlib/Algebra/Order/BigOperators/Expect.lean,Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Field/Power.lean,Mathlib/Algebra/Order/Floor/Extended.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Module/Field.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/Order.lean,Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Real/Sqrt.lean,Mathlib/Analysis/SpecialFunctions/Bernstein.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.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/DerivHyp.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Bound.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Removal.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Real.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/EReal/Inv.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/Factorial/DoubleFactorial.lean,Mathlib/Data/Nat/Totient.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/Geometry/Euclidean/Altitude.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Measure/Real.lean,Mathlib/NumberTheory/ArithmeticFunction/Misc.lean,Mathlib/NumberTheory/ArithmeticFunction/Zeta.lean,Mathlib/NumberTheory/Height/Basic.lean,Mathlib/NumberTheory/Height/NumberField.lean,Mathlib/NumberTheory/Height/Projectivization.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/NumberTheory/SelbergSieve.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Positivity/Finset.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean,MathlibTest/positivity.lean |
54 |
94 |
['HugLycan', 'JovanGerb', 'Vierkantor', 'fpvandoorn', 'github-actions', 'joneugster', 'leanprover-radar', 'mathlib-merge-conflicts'] |
dwrensha assignee:dwrensha |
1-16990 1 day ago |
1-45263 1 day ago |
64-45258 64 days |
| 39903 |
akiezun author:akiezun |
feat(NumberTheory): add almost prime numbers |
Adds Nat.IsAlmostPrime k n for natural numbers with exactly k prime factors counted with multiplicity, plus
Nat.IsAtMostAlmostPrime and Nat.IsSemiprime. The definitions reuse the existing arithmetic function Ω, and the initial
API proves the basic zero/one cases, prime examples, and closure under multiplication.
---
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|
new-contributor
t-number-theory
maintainer-merge
merge-conflict
|
87/0 |
Mathlib.lean,Mathlib/NumberTheory/AlmostPrime.lean |
2 |
9 |
['SnirBroshi', 'akiezun', 'github-actions', 'loefflerd', 'mathlib-merge-conflicts', 'riccardobrasca', 'vihdzp'] |
loefflerd assignee:loefflerd |
1-7647 1 day ago |
1-7648 1 day ago |
16-81193 16 days |
| 40560 |
eric-wieser author:eric-wieser |
feat: tag map_mono and comap_mono with gcongr |
---
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[](https://gitpod.io/from-referrer/)
|
easy
maintainer-merge
|
20/2 |
Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/CategoryTheory/Groupoid/Subgroupoid.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Data/Multiset/MapFold.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/GroupTheory/FiniteIndexNormalSubgroup.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Basic.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/Topology/Sets/Opens.lean |
15 |
2 |
['YaelDillies', 'github-actions'] |
nobody |
0-70164 19 hours ago |
1-19060 1 day ago |
1-18871 1 day |
| 39703 |
YaelDillies author:YaelDillies |
chore: create a `Basic` top folder |
Move a select few folders from `Logic` to a new `Basic` folder.
The goal is to finally move the material misplaced in the `Data` and `Logic` folder and to clarify the various expectations of each folder. Ultimately:
* the `Basic` folder will be about basic predicates on types and basic mathematical types not fitting in any other folder;
* the `Data` folder will be about data structures, instead of the current mix of data structures and basic mathematical types not fitting in any other folder;
* the `Logic` folder will be about advanced logic results not fitting in either `ModelTheory` or `SetTheory`, instead of the current mix of basic predicates on types and advanced logic results.
Many more files (~1000) could be moved, so I will do it in several PRs. Not all files should move to `Basic`. Some files should go to `Algebra.Order` instead (eg `Data.Nat.Lattice`) and some should be straight out deprecated (eg `Data.Analysis`).
[Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/345428-mathlib-reviewers/topic/Basic.20folder/with/597151406)
---
This PR stems from discussions at the MI retreat 2026.
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file-removed
t-data
maintainer-merge
|
148/96 |
Counterexamples/Girard.lean,Mathlib.lean,Mathlib/Algebra/CharZero/Defs.lean,Mathlib/Algebra/Group/Irreducible/Defs.lean,Mathlib/Algebra/Group/Nat/Units.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/Module/Presentation/Free.lean,Mathlib/Algebra/Module/Projective.lean,Mathlib/Algebra/NeZero.lean,Mathlib/Basic/Denumerable.lean,Mathlib/Basic/ExistsUnique.lean,Mathlib/Basic/IsEmpty.lean,Mathlib/Basic/IsEmpty/Basic.lean,Mathlib/Basic/IsEmpty/Defs.lean,Mathlib/Basic/Logic/Basic.lean,Mathlib/Basic/Logic/Lemmas.lean,Mathlib/Basic/Nonempty.lean,Mathlib/Basic/Nontrivial/Basic.lean,Mathlib/Basic/Nontrivial/Defs.lean,Mathlib/Basic/README.md,Mathlib/Basic/Unique.lean,Mathlib/Basic/UnivLE.lean,Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/Limits/Types/Colimits.lean,Mathlib/CategoryTheory/Limits/Types/Limits.lean,Mathlib/CategoryTheory/UnivLE.lean,Mathlib/Combinatorics/Quiver/Path.lean,Mathlib/Computability/Primrec/Basic.lean,Mathlib/Data/Bool/Basic.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/GetD.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/MaxPowDiv.lean,Mathlib/Data/Option/Basic.lean,Mathlib/Data/Quot.lean,Mathlib/Data/README.md,Mathlib/Data/Rat/Denumerable.lean,Mathlib/Data/TwoPointing.lean,Mathlib/Lean/Meta/CongrTheorems.lean,Mathlib/LinearAlgebra/Matrix/Defs.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/Logic/Equiv/List.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Logic/README.md,Mathlib/Order/OrderIsoNat.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/WithBot.lean,Mathlib/RingTheory/Coprime/Basic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/UnivLE.lean,Mathlib/SetTheory/ZFC/Rank.lean,Mathlib/Tactic/CancelDenoms/Core.lean,Mathlib/Tactic/CongrExclamation.lean,Mathlib/Tactic/ITauto.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Nontriviality/Core.lean,Mathlib/Tactic/Push.lean,Mathlib/Tactic/Subsingleton.lean,Mathlib/Tactic/Tauto.lean,Mathlib/Testing/Plausible/Testable.lean,Mathlib/Topology/Order/UpperLowerSetTopology.lean,MathlibTest/Linter/PrivateModule/ImportOnly.lean,scripts/autolabel.lean,scripts/noshake.json |
69 |
27 |
['SnirBroshi', 'YaelDillies', 'github-actions', 'grunweg', 'joneugster', 'mathlib-merge-conflicts', 'themathqueen'] |
joneugster assignee:joneugster |
0-69869 19 hours ago |
0-73290 20 hours ago |
17-5362 17 days |
| 40456 |
YaelDillies author:YaelDillies |
chore(Algebra): use `Even.pow_of_ne_zero` |
Also use `Even.pow_of_ne_zero` wherever possible.
From APAP
---
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|
maintainer-merge
t-algebra
label:t-algebra$ |
2/2 |
Mathlib/NumberTheory/Fermat.lean |
1 |
9 |
['YaelDillies', 'eric-wieser', 'github-actions', 'themathqueen'] |
nobody |
0-67911 18 hours ago |
3-56142 3 days ago |
3-55953 3 days |
| 37870 |
Jun2M author:Jun2M |
feat(Combinatorics/Graph): `Simple` typeclass for `Graph` |
This PR introduces two type classes on `Graph`: `Loopless` and `Simple`.
---
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|
t-combinatorics
maintainer-merge
|
92/0 |
Mathlib.lean,Mathlib/Combinatorics/Graph/Simple.lean |
2 |
6 |
['YaelDillies', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
0-67900 18 hours ago |
43-84844 43 days ago |
63-32688 63 days |
| 31361 |
alreadydone author:alreadydone |
feat(Algebra/Order): convex subgroups |
---
- [x] depends on: #32886
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|
t-algebra
t-order
maintainer-merge
label:t-algebra$ |
318/0 |
Mathlib.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/Group/Convex.lean,Mathlib/Order/Birkhoff.lean,Mathlib/Order/Quotient.lean |
5 |
66 |
['Vierkantor', 'YaelDillies', 'alreadydone', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vihdzp', 'wwylele'] |
nobody |
0-66848 18 hours ago |
7-22670 7 days ago |
36-49992 36 days |
| 37598 |
IvanRenison author:IvanRenison |
feat(Combinatorics/SimpleGraph/Coloring): add lemmas about coloring and maps |
---
Idea from this Zulip thread: [graph theory>Second Order Monadic Logic for Graph](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Second.20Order.20Monadic.20Logic.20for.20Graph/with/583013775)
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|
t-combinatorics
maintainer-merge
merge-conflict
|
32/11 |
Mathlib/Combinatorics/SimpleGraph/Coloring/Vertex.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean |
2 |
34 |
['IvanRenison', 'SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts'] |
nobody |
0-65829 18 hours ago |
0-65829 18 hours ago |
63-70840 63 days |
| 39491 |
Yu-Misaka author:Yu-Misaka |
feat: a Cartan matrix of a reduced crystallographic root system cannot have eigenvalue 4 |
This proves the TODO that a Cartan matrix of a reduced crystallographic root system cannot have eigenvalue 4.
---
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|
new-contributor
t-algebra
codex
LLM-generated
maintainer-merge
label:t-algebra$ |
20/7 |
Mathlib/LinearAlgebra/RootSystem/CartanMatrix.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Basis.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Semisimple.lean |
3 |
11 |
['Yu-Misaka', 'copilot-pull-request-reviewer', 'github-actions', 'mathlib-bors', 'ocfnash'] |
ocfnash assignee:ocfnash |
0-40897 11 hours ago |
1-41110 1 day ago |
18-55079 18 days |
| 40558 |
ChiCubed author:ChiCubed |
feat(NumberTheory/Padics/PadicVal): remove redundant hypotheses + add `padicValRat.zpow` |
We remove redundant hypotheses q != 0 on pow / inv theorems (which can now be simp), and add the missing theorem `padicValRat.zpow`
---
Note that some theorems have had signatures changed accordingly, and some simp theorems (`padicValRat.self_pow_inv`, `padicValNat.prime_pow`) are "redundant" now.
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|
t-number-theory
new-contributor
maintainer-merge
|
18/11 |
Mathlib/NumberTheory/Padics/PadicVal/Basic.lean |
1 |
6 |
['MichaelStollBayreuth', 'github-actions', 'leanprover-radar'] |
MichaelStollBayreuth assignee:MichaelStollBayreuth |
0-34940 9 hours ago |
1-20493 1 day ago |
1-20773 1 day |
| 35812 |
khwilson author:khwilson |
feat(MeasureTheory/Group/GeometryOfNumbers): successive minima and existence of a directional basis |
Define the successive minima of a discrete subgroup of a real vector space with respect to a convex set. These invariants show up throughout the geometry of numbers and are the focus of Minkowski's Second Theorem (whose statement is left here with a `proof_wanted`).
Note: The key lemma is that the "gauge set" of the convex set is closed. I took the approach of showing that it is sequentially closed. There's an alternative approach via showing it's the union of a finite number of closed sets. I personally thought this approach was more intuitive, but the union approach may result in a slightly shorter proof.
Co-authored-by: Yaël Dillies <yael.dillies@gmail.com>
---
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[](https://gitpod.io/from-referrer/)
|
new-contributor
t-measure-probability
maintainer-merge
|
350/36 |
Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Body.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/MeasureTheory/Group/GeometryOfNumbers.lean,Mathlib/NumberTheory/NumberField/Units/Regulator.lean |
7 |
91 |
['Vierkantor', 'YaelDillies', 'github-actions', 'joneugster', 'khwilson', 'mathlib-merge-conflicts', 'ocfnash'] |
sgouezel assignee:sgouezel |
0-33964 9 hours ago |
0-35841 9 hours ago |
49-46998 49 days |
| 39307 |
FordUniver author:FordUniver |
feat(Combinatorics/SimpleGraph/Copy): introduce `UnlabeledCopy` carrier subtype |
Adds `abbrev UnlabeledCopy A B := {B' : B.Subgraph // Nonempty (A ≃g B'.coe)}` and uses it to replace the previous inline filter-set body of `copyCount G H`. Drops the now unused legacy Finset-image bridge `copyCount_eq_card_image_copyToSubgraph`. Adds `uniqueUnlabeledCopyBot` instance so `copyCount_bot` is a one-liner via `Fintype.card_unique`.
Co-authored-by: Malte Jackisch <45597826+MaltyBlanket@users.noreply.github.com>
---
**Step 1/5 of the `Copy` / `InducedCopy` refactor-feat stack.**
This PR isolates the `UnlabeledCopy` type introduction and the count's type-form redefinition from the larger rename/convention work in the rest of the stack. Note that resolving the current clash in naming (`Copy` and `UnlabeledCopy` vs `labelledCopyCount` and `copyCount`) is part of #38745.
|
t-combinatorics
maintainer-merge
|
32/30 |
Mathlib/Combinatorics/SimpleGraph/Copy.lean |
1 |
8 |
['FordUniver', 'YaelDillies', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'mitchell-horner'] |
nobody |
0-18928 5 hours ago |
19-66057 19 days ago |
29-75007 29 days |
| 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 |
| 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` |
---
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Split from #17593.
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-algebra
awaiting-zulip
t-order
label:t-algebra$ |
146/44 |
Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean |
2 |
11 |
['YaelDillies', 'astrainfinita', 'github-actions', 'j-loreaux'] |
nobody |
570-47317 1 year ago |
577-39876 577 days ago |
33-64877 33 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
---
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- [ ] depends on: #15651
- [ ] depends on: #15649
[](https://gitpod.io/from-referrer/)
|
blocked-by-other-PR
new-contributor
t-computability
merge-conflict
awaiting-zulip
|
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 |
404-10594 1 year ago |
673-33779 673 days ago |
0-179 2 minutes |
| 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.
---
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[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-algebra
awaiting-zulip
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 |
343-77343 11 months ago |
615-24986 615 days ago |
0-66650 18 hours |
| 25218 |
kckennylau author:kckennylau |
feat(AlgebraicGeometry): Tate normal form of elliptic curves |
---
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[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-algebraic-geometry
awaiting-zulip
new-contributor
|
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 |
343-76181 11 months ago |
376-51298 376 days ago |
6-47693 6 days |
| 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 |
t-algebra
merge-conflict
slow-typeclass-synthesis
awaiting-zulip
t-analysis
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 |
284-5426 9 months ago |
292-42980 292 days ago |
0-20585 5 hours |
| 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!
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|
merge-conflict
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 |
4 |
['euprunin', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot'] |
nobody |
240-69036 7 months ago |
292-14433 292 days ago |
0-1 1 second |
| 30150 |
imbrem author:imbrem |
feat(CategoryTheory/Monoidal): to_additive for MonoidalCategory |
Add `AddMonoidalCategory`, the additive version of `MonoidalCategory`.
To get this to work, I needed to _remove_ the `to_additive` attributes in `Discrete.lean`, since existing code relies on the `AddMonoid M → MonoidalCategory M` instance. For now, we simply implement the additive variants by hand instead.
---
As discussed in #28718; I added an `AddMonoidalCategory` struct and tagged `MonoidalCategory` with `to_additive`, along with the lemmas in `Category.lean`.
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`
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|
t-category-theory
large-import
new-contributor
merge-conflict
awaiting-zulip
t-meta
|
444/125 |
Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/Tactic/ToAdditive/GuessName.lean |
3 |
22 |
['JovanGerb', 'YaelDillies', 'github-actions', 'imbrem', 'mathlib4-merge-conflict-bot'] |
nobody |
212-79910 7 months ago |
252-58576 252 days ago |
1-160 1 day |
| 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
---
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|
new-contributor
t-computability
merge-conflict
awaiting-author
awaiting-zulip
|
307/5 |
Mathlib/Computability/NFA.lean |
1 |
27 |
['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop'] |
nobody |
208-10642 6 months ago |
627-38030 627 days ago |
45-84611 45 days |
| 15649 |
TpmKranz author:TpmKranz |
feat(Computability): introduce Generalised NFA as bridge to Regular Expression |
Lays the groundwork for a proof of equivalence of NFA and RE, w.r.t. described language. Actual connection to NFA comes later, after the groundwork for the opposite direction has been laid.
Second chunk of #12648
---
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- [x] depends on: #15647 [Data.FinEnum.Option unchanged since then]
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-computability
merge-conflict
awaiting-author
awaiting-zulip
|
298/0 |
Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib |
5 |
7 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'meithecatte', 'trivial1711'] |
nobody |
207-26883 6 months ago |
552-76813 552 days 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.
---
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|
merge-conflict
t-computability
awaiting-zulip
new-contributor
|
490/0 |
Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib |
3 |
7 |
['anthonyde', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'meithecatte', 'qawbecrdtey'] |
nobody |
206-64051 6 months ago |
404-10580 404 days ago |
75-77754 75 days |
| 11800 |
JADekker author:JADekker |
feat: 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.
---
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|
please-adopt
merge-conflict
t-topology
awaiting-zulip
|
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 |
206-35917 6 months ago |
681-56199 681 days ago |
123-25636 123 days |
| 30668 |
astrainfinita author:astrainfinita |
feat: `QuotType` |
This typeclass is primarily for use by type synonyms of `Quot` and `Quotient`. Using `QuotType` API for type synonyms of `Quot` and `Quotient` will avoid defeq abuse caused by directly using `Quot` and `Quotient` APIs.
This PR also adds some typeclasses to support different ways to find the quotient map that should be used. See the documentation comments of these typeclasses for examples of usage.
---
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It's not a typical design to use these auxiliary typeclasses and term elaborators, but I haven't found a better way to support these notations.
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.
- It would be helpful if the names of new type classes explained their functionality better.
[Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/migrate.20to.20.60QuotLike.60.20API)
This PR continues the work from #16421.
Original PR: https://github.com/leanprover-community/mathlib4/pull/16421 |
RFC
t-data
awaiting-zulip
awaiting-author
|
629/0 |
Mathlib.lean,Mathlib/Data/QuotType.lean,MathlibTest/QuotType.lean |
3 |
22 |
['SnirBroshi', 'YaelDillies', 'astrainfinita', 'dagurtomas', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp'] |
nobody |
185-17763 6 months ago |
237-73016 237 days ago |
0-81 1 minute |
| 33368 |
urkud author:urkud |
feat: define `Complex.UnitDisc.shift` |
Also review the existing API
UPD: I'm going to define a `PSL(2, Real)` action instead.
---
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[](https://gitpod.io/from-referrer/) |
t-analysis
awaiting-zulip
merge-conflict
|
273/39 |
Mathlib.lean,Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/Complex/UnitDisc/Shift.lean |
3 |
7 |
['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'sgouezel', 'urkud'] |
j-loreaux assignee:j-loreaux |
157-72476 5 months ago |
158-32809 158 days ago |
7-10690 7 days |
| 33031 |
chiyunhsu author:chiyunhsu |
feat(Combinatorics/Enumerative/Partition): add combinatorial proof of Euler's partition theorem |
The new file EulerComb.lean contains the combinatorial proof of Euler's partition theorem. The analytic proof of the theorem and its generalization of Glaisher's Theorem has already been formalized in [Glaisher.lean](https://github.com/leanprover-community/mathlib4/blob/master/Mathlib/Combinatorics/Enumerative/Partition/Glaisher.lean). The generalization of the combinatorial proof from this file to Glaisher's Theorem is within reach.
---
Zulip discussion: [#mathlib4 > Glaisher’s Bijection on integer partitions](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Glaisher.E2.80.99s.20Bijection.20on.20integer.20partitions/with/570808111)
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|
t-combinatorics
new-contributor
awaiting-zulip
awaiting-author
|
531/0 |
Mathlib.lean,Mathlib/Combinatorics/Enumerative/Partition/EulerComb.lean |
2 |
7 |
['chiyunhsu', 'dagurtomas', 'github-actions', 'tb65536', 'vihdzp'] |
b-mehta assignee:b-mehta |
135-39729 4 months ago |
135-39729 135 days ago |
42-21618 42 days |
| 32742 |
LTolDe author:LTolDe |
feat(MeasureTheory/Constructions/Polish/Basic): add class SuslinSpace |
add new class `SuslinSpace` for a topological space that is an analytic set in itself
This will be useful to prove the **Effros Theorem**, see [zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Effros.20Theorem/with/558712441).
---
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|
new-contributor
awaiting-zulip
t-measure-probability
awaiting-author
|
4/0 |
Mathlib/MeasureTheory/Constructions/Polish/Basic.lean |
1 |
10 |
['ADedecker', 'LTolDe', 'dagurtomas', 'dupuisf', 'github-actions', 'jcommelin'] |
PatrickMassot assignee:PatrickMassot |
132-52139 4 months ago |
169-50297 169 days ago |
14-69429 14 days |
| 26299 |
adomani author:adomani |
perf: the `whitespace` 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!
---
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|
t-linter
awaiting-zulip
awaiting-author
|
55/7 |
Mathlib/Tactic/Linter/Whitespace.lean |
1 |
20 |
['adomani', 'eric-wieser', 'github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-bot', 'leanprover-radar', 'mathlib-bors', 'mathlib4-merge-conflict-bot'] |
grunweg assignee:grunweg |
115-62913 3 months ago |
288-59231 288 days ago |
66-73556 66 days |
| 35524 |
grunweg author:grunweg |
feat: text-based linter against \t followed by tactic mode |
Wait for the zulip discussion to converge. **If** there is consensus in favour of this change, summarise the motivation here.
[zulip discuss](https://leanprover.zulipchat.com/#narrow/channel/345428-mathlib-reviewers/topic/proposal.3A.20no.20more.20use.20of.20.60.E2.96.B8.60.20in.20Mathlib.3F/with/574680826)
---
There are currently 80 remaining exceptions in mathlib: ideally, these would get fixed before merging this.
Works best when combined with #35523.
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|
t-linter
awaiting-zulip
merge-conflict
|
23/2 |
Mathlib/Tactic/Linter/TextBased.lean |
1 |
5 |
['github-actions', 'grunweg', 'joneugster', 'mathlib-merge-conflicts', 'vihdzp'] |
nobody |
113-33532 3 months ago |
114-56304 114 days ago |
0-3308 55 minutes |
| 35578 |
Shreyas4991 author:Shreyas4991 |
fix: writer monad should use an additive logging type |
The Writer monad's w type is supposed to be additive, not multiplicative. This is how it is conceptually used in Haskell (as a logging type). Haskell uses `Monoid` because it doesn't make a distinction between `AddMonoid` and `Monoid`.
[#mathlib4 > Writer should use an additive monoid @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Writer.20should.20use.20an.20additive.20monoid/near/574990415)
---
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|
t-data
awaiting-zulip
merge-conflict
|
10/10 |
Mathlib/Control/Monad/Cont.lean,Mathlib/Control/Monad/Writer.lean |
2 |
5 |
['Shreyas4991', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
113-12046 3 months ago |
113-12047 113 days ago |
0-18707 5 hours |
| 20238 |
maemre author:maemre |
feat(Computability/DFA): Closure of regular languages under some set operations |
This shows that regular languages are closed under complement and intersection by constructing DFAs for them.
---
Closure under all other operations will be proved when someone adds the proof for DFA<->regular expression equivalence, so they are not part of this PR.
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|
new-contributor
t-computability
merge-conflict
awaiting-author
awaiting-zulip
|
159/0 |
Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean |
2 |
60 |
['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'mathlib4-merge-conflict-bot', 'meithecatte', 'urkud'] |
nobody |
107-57285 3 months ago |
453-35224 453 days ago |
48-67492 48 days |
| 22361 |
rudynicolop author:rudynicolop |
feat(Computability/NFA): nfa closure properties |
Add the closure properties union, intersection and reversal for NFA.
---
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|
new-contributor
t-computability
merge-conflict
awaiting-author
awaiting-zulip
|
218/2 |
Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean |
2 |
91 |
['EtienneC30', 'b-mehta', 'ctchou', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop'] |
nobody |
107-57269 3 months ago |
404-39163 404 days ago |
39-60525 39 days |
| 23929 |
meithecatte author:meithecatte |
feat(Computability/NFA): improve bound on pumping lemma |
---
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- [x] depends on: #25321
[](https://gitpod.io/from-referrer/)
|
t-computability
awaiting-zulip
new-contributor
awaiting-author
|
101/10 |
Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean |
2 |
42 |
['YaelDillies', 'dagurtomas', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'meithecatte'] |
nobody |
106-77298 3 months ago |
371-20197 371 days ago |
34-10092 34 days |
| 34963 |
Parcly-Taxel author:Parcly-Taxel |
feat(Archive): proof of the Robbins conjecture |
Cf. [#mathlib4 > Alternative axiomatization of boolean algebras @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Alternative.20axiomatization.20of.20boolean.20algebras/near/558900960) and #31924. |
t-algebra
awaiting-zulip
label:t-algebra$ |
610/0 |
Archive.lean,Archive/Robbins.lean |
2 |
2 |
['chrisflav', 'github-actions'] |
chrisflav assignee:chrisflav |
105-29339 3 months ago |
54-29314 54 days ago |
71-52253 71 days |
| 30750 |
SnirBroshi author:SnirBroshi |
feat(Data/Quot): `toSet` and `equivClassOf` |
Define `toSet` which gets the set corresponding to an element of a quotient, and `equivClassOf` which gets the equivalence class of an element under a quotient.
---
I found these definitions helpful when working with quotients, specifically `ConnectedComponents` of a `TopologicalSpace`.
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|
t-data
awaiting-author
awaiting-zulip
|
162/0 |
Mathlib/Data/Quot.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Data/Setoid/Basic.lean |
4 |
8 |
['SnirBroshi', 'TwoFX', 'eric-wieser', 'github-actions', 'linesthatinterlace', 'mathlib-merge-conflicts'] |
TwoFX assignee:TwoFX |
102-59499 3 months ago |
198-62839 198 days ago |
36-69524 36 days |
| 36890 |
vihdzp author:vihdzp |
chore(SetTheory): `le_mul_left` → `le_mul_of_pos_left` |
The new theorem names/statements match [`Nat.le_mul_of_pos_left`](https://leanprover-community.github.io/mathlib4_docs/Init/Data/Nat/Lemmas.html#Nat.le_mul_of_pos_left). The cardinal one has also been moved to an earlier file.
---
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|
t-set-theory
awaiting-zulip
merge-conflict
|
28/23 |
Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Free.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/SetTheory/Ordinal/Notation.lean |
6 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
82-67454 2 months ago |
85-54194 85 days ago |
0-10825 3 hours |
| 32608 |
PrParadoxy author:PrParadoxy |
feat(LinearAlgebra/PiTensorProduct): API for PiTensorProducts indexed by sets |
This PR addresses a TODO item in LinearAlgebra/PiTensorProduct.lean:
* API for the various ways ι can be split into subsets; connect this
with the binary tensor product
-- specifically by describing tensors of type ⨂ (i : S), M i, for S : Set ι.
Our primary motivation is to formalise the notion of "restricted tensor
products". This will be the content of a follow-up PR.
Beyond that, the Set API is natural in contexts where the index type has
an independent interpretation. An example is quantum physics, where ι
ranges over distinguishable degrees of freedom, and where its is common
practice to annotate objects by the set of indices they are defined on.
---
Stub file with preliminary definition of the restricted tensor product as a direct limit of tensors indexed by finite subsets of an index type:
https://github.com/PrParadoxy/mathlib4/blob/restricted-stub/Mathlib/LinearAlgebra/PiTensorProduct/Restricted.lean
---
- [x] depends on: #32598
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|
new-contributor
awaiting-zulip
t-algebra
WIP
label:t-algebra$ |
300/2 |
Mathlib.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Set.lean |
3 |
31 |
['PrParadoxy', 'dagurtomas', 'eric-wieser', 'github-actions', 'goliath-klein', 'leanprover-radar', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
33-18514 1 month ago |
173-29236 173 days ago |
10-66980 10 days |
| 39026 |
fpvandoorn author:fpvandoorn |
feat: add assume tactic |
Teaching tactic: `assume p, q, r` is short for `intro (_ : p) (_ : q) (_ : r)`.
---
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[Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Assume.20tactic/with/593477478)
[](https://gitpod.io/from-referrer/)
|
awaiting-zulip
t-meta
awaiting-author
|
123/0 |
Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Assume.lean,MathlibTest/Assume.lean |
4 |
9 |
['fpvandoorn', 'github-actions', 'joneugster'] |
joneugster assignee:joneugster |
15-53737 15 days ago |
37-55810 37 days ago |
0-1 1 second |
| 39233 |
linesthatinterlace author:linesthatinterlace |
feat: `Pi.map` rename to `Function.map` |
This PR renames `Pi.map` to `Function.map` and makes the changes necessary to support this. In particular this means that Mathlib.Logic.Function.Defs now only contains the Function namespace.
A future PR may update the names of *.piMap in line with this.
Zulip thread: [#PR reviews > #39233 - rename Pi.map to Function.map @ 💬](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2339233.20-.20rename.20Pi.2Emap.20to.20Function.2Emap/near/594605689)
General discussion regarding the Pi namespace: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/The.20Pi.20namespace/near/594782721
---
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|
awaiting-zulip |
130/121 |
Mathlib/Algebra/Category/Grp/AB.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Order/Antidiag/Nat.lean,Mathlib/Algebra/Regular/Pi.lean,Mathlib/Analysis/InnerProductSpace/Coalgebra.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Condensed/Discrete/LocallyConstant.lean,Mathlib/Control/Bifunctor.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Prod/Basic.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Dynamics/Ergodic/MeasurePreserving.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/Dynamics/TopologicalEntropy/Semiconj.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/GroupTheory/MonoidLocalization/Lemmas.lean,Mathlib/LinearAlgebra/Multilinear/Basis.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Logic/Function/Defs.lean,Mathlib/Logic/Function/Iterate.lean,Mathlib/Order/Filter/Cofinite.lean,Mathlib/Order/Filter/Pi.lean,Mathlib/RingTheory/Coalgebra/Basic.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/Module/ContinuousLinearMap/PiProd.lean,Mathlib/Topology/Algebra/RestrictedProduct/TopologicalSpace.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Maps/Basic.lean,Mathlib/Topology/MetricSpace/HausdorffAlexandroff.lean,Mathlib/Topology/MetricSpace/Isometry.lean,Mathlib/Topology/NhdsWithin.lean |
37 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
15-27672 15 days ago |
32-35350 32 days ago |
0-7302 2 hours |
| 37346 |
euprunin author:euprunin |
chore: golf using `grind` |
The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective.
Trace profiling results (differences <30 ms considered measurement noise):
* `✅️ SimpleGraph.Walk.IsPath.getVert_injOn`: unchanged 🎉
* `✅️ SimpleGraph.Walk.length_bypass_le`: unchanged 🎉
* `✅️ Rat.floor_intCast_div_natCast`: unchanged 🎉
* `✅️ InnerProductGeometry.norm_eq_of_angle_sub_eq_angle_sub_rev_of_angle_ne_pi`: unchanged 🎉
* `✅️ padicNorm.zero_of_padicNorm_eq_zero`: unchanged 🎉
Profiled using `set_option trace.profiler true in`.
---
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|
maintainer-merge
awaiting-zulip
merge-conflict
|
7/45 |
Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean |
4 |
23 |
['FernandoChu', 'bryangingechen', 'chenson2018', 'euprunin', 'faenuccio', 'github-actions', 'grunweg', 'mathlib-merge-conflicts'] |
nobody |
9-4129 9 days ago |
45-48258 45 days ago |
30-49603 30 days |
| 39311 |
felixpernegger author:felixpernegger |
refactor: redefine `eLpNorm` at `p = 0` |
For Zulip discussion see https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/eLpNorm.20junk.20value/with/576356442. In partuclar this change is suggestion 2 in [#mathlib4 > eLpNorm junk value @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/eLpNorm.20junk.20value/near/576340531)
This redefined [MeasureTheory.eLpNorm](https://leanprover-community.github.io/mathlib4_docs/Mathlib/MeasureTheory/Function/LpSeminorm/Defs.html#MeasureTheory.eLpNorm) at `p = 0`. Previously it was always `0` but now it is the measure of the support of the function (technical detail: In order to avoid having to add additional arguments to `eLpNorm`, we define it as the measure of the support of the norm of the function, but this is almost always the same)
The motivation for this comes from the counting measure, in particular this then unifies with https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Normed/Lp/lpSpace.html#Mem%E2%84%93p. In any case, it is "closer" to the actual mathematical definition
Unfortunately, since `eLpNorm` is widely used, the diff is very large and a lot of theorems break (i.e. now require `p != 0`). Oftentimes `p != 0` is still not required (sometimes with nontrivial arguments), I tried to avoid adding extra hypothesis whenever I could but I almost certainly missed some.
There now may also be places where we dont need `p != 0` as a hypothesis anymore (i.e. for `[Memℓp](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Normed/Lp/lpSpace.html#Mem%E2%84%93p)`), but this is not included in this PR.
---
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|
awaiting-zulip |
950/595 |
Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/Distribution/TemperateGrowth.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Analysis/Fourier/LpSpace.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/Normed/Lp/SmoothApprox.lean,Mathlib/Data/ENNReal/Holder.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Holder.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Defs.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Indicator.lean,Mathlib/MeasureTheory/Function/LpSeminorm/LpNorm.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Monotonicity.lean,Mathlib/MeasureTheory/Function/LpSeminorm/SMul.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Trim.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Complete.lean,Mathlib/MeasureTheory/Function/LpSpace/CompleteOfCompleteLp.lean,Mathlib/MeasureTheory/Function/LpSpace/ContinuousFunctions.lean,Mathlib/MeasureTheory/Function/LpSpace/Indicator.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/Probability/CentralLimitTheorem.lean,Mathlib/Probability/Distributions/Gaussian/Basic.lean,Mathlib/Probability/Distributions/Gaussian/Fernique.lean,Mathlib/Probability/Distributions/Gaussian/HasGaussianLaw/Basic.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Probability/IdentDistrib.lean,Mathlib/Probability/Kernel/Disintegration/CDFToKernel.lean,Mathlib/Probability/Kernel/Disintegration/Density.lean,Mathlib/Probability/Martingale/Convergence.lean,Mathlib/Probability/Moments/CovarianceBilinDual.lean,Mathlib/Probability/Moments/IntegrableExpMul.lean,Mathlib/Probability/Moments/SubGaussian.lean,Mathlib/Probability/Process/Filtration.lean,MathlibTest/congr.lean |
45 |
40 |
['felixpernegger', 'github-actions', 'mathlib-merge-conflicts', 'sgouezel'] |
nobody |
8-42515 8 days ago |
8-44171 8 days ago |
5-67427 5 days |
| 38546 |
yhx-12243 author:yhx-12243 |
fix(Algebra/Module/Injective): changing the universe from the module's to the ring's |
Change the definition of
```lean
class Module.Injective : Prop where
out : ∀ ⦃X Y : Type v⦄ [AddCommGroup X] [AddCommGroup Y] [Module R X] [Module R Y]
(f : X →ₗ[R] Y) (_ : Function.Injective f) (g : X →ₗ[R] Q),
∃ h : Y →ₗ[R] Q, ∀ x, h (f x) = g x
```
into
```lean
class Module.Injective : Prop where
out : ∀ ⦃X Y : Type u⦄ [AddCommGroup X] [AddCommGroup Y] [Module R X] [Module R Y]
(f : X →ₗ[R] Y) (_ : Function.Injective f) (g : X →ₗ[R] Q),
∃ h : Y →ₗ[R] Q, ∀ x, h (f x) = g x
```
where `u` is the universe of ring, `v` is the universe of module,
to make it agree with `Module.Baer` and real mathematical definition, **without universe issues** (make the theorem [`Module.Baer.of_injective`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Module/Injective.html#Module.Baer.of_injective) not require `Small.{v, u} R` issue).
This type of adaption also appeared in the criterion `Module.Flat`, which also uses `Type u` on testing modules.
See discussions in https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Universe.20issue.20about.20injective.20module .
---
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|
t-algebra
new-contributor
awaiting-zulip
awaiting-author
label:t-algebra$ |
57/43 |
Mathlib/Algebra/Category/ModuleCat/Injective.lean,Mathlib/Algebra/Category/ModuleCat/Ulift.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/RepresentationTheory/FinGroupCharZero.lean,Mathlib/RingTheory/Flat/Tensor.lean,Mathlib/RingTheory/LocalProperties/Injective.lean |
6 |
10 |
['eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors', 'wwylele', 'yhx-12243'] |
nobody |
4-60747 4 days ago |
48-16014 48 days ago |
0-26133 7 hours |
| 40061 |
gasparattila author:gasparattila |
chore(MeasureTheory/SetSemiring): deprecate `disjointOfUnion` |
This definition was only used in the proof of `AddContent.addContent_sUnion_le_sum`. Since it is defined using choice with very specific properties, it is unlikely to be reusable elsewhere.
---
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|
t-measure-probability
awaiting-zulip
|
10/0 |
Mathlib/MeasureTheory/SetSemiring.lean |
1 |
5 |
['RemyDegenne', 'WojciechCzernous', 'gasparattila', 'github-actions', 'mathlib-dependent-issues'] |
EtienneC30 assignee:EtienneC30 |
2-21212 2 days ago |
11-47589 11 days ago |
1-10686 1 day |
| 39790 |
hawkrobe author:hawkrobe |
feat(RingTheory): quotients of coalgebra/bialgebra/Hopf algebras |
---
Adds the quotient constructions suggested [here](https://github.com/leanprover-community/mathlib4/pull/39579#issuecomment-4529401418).
Based on the [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Canonical.20way.20to.20quotient.20a.20ring/with/598586882), I used`I : Ideal A` with [I.IsTwoSided] (rather than RingQuot). I also added `HopfAlgebra.ofSurjective`to make it cleaner but that might be overreach in one PR, let me know if it would be better to split. |
t-ring-theory
new-contributor
awaiting-zulip
|
296/0 |
Mathlib.lean,Mathlib/RingTheory/Bialgebra/Quotient.lean,Mathlib/RingTheory/Coalgebra/Quotient.lean,Mathlib/RingTheory/HopfAlgebra/Quotient.lean |
4 |
13 |
['YaelDillies', 'eric-wieser', 'github-actions', 'hawkrobe'] |
nobody |
0-35635 9 hours ago |
12-63160 12 days ago |
6-20306 6 days |
| 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 |
| 39808 |
chenson2018 author:chenson2018 |
chore(Data): refactor proofs where `grind?` fails |
These are sources of technical debt as now reported in the [weekly linting report](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Weekly.20linting.20log/with/544658968). The idea is that a successful `grind` proof can fail to report the theorems it used via `grind?`, which means that if these proofs break across toolchains that it becomes significantly harder to repair.
Most of these are fixed by squeezing the call to `grind` and unsetting `linter.tacticAnalysis.verifyGrindOnly` so they no longer appear in the weekly report. Unfortunately, this can't be on by default for performance reasons, but I highly encourage using this linter when adding any `grind` proofs.
---
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|
t-data
tech debt
|
69/41 |
Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Bool/Set.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Fin/Tuple/NatAntidiagonal.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Finset/Range.lean,Mathlib/Data/Finset/SMulAntidiagonal.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Count.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/List/Induction.lean,Mathlib/Data/List/ReduceOption.lean,Mathlib/Data/List/Sigma.lean,Mathlib/Data/List/Sort.lean,Mathlib/Data/List/TakeDrop.lean,Mathlib/Data/List/Triplewise.lean,Mathlib/Data/Option/Basic.lean,Mathlib/Data/Set/Card.lean,Mathlib/Data/Set/Disjoint.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Sum/Order.lean |
24 |
1 |
['github-actions'] |
nobody |
19-59855 19 days ago |
19-73275 19 days ago |
19-73086 19 days |
| 39755 |
wwylele author:wwylele |
chore(GroupTheory): remove a defeq abuse |
---
I am not sure if this is the right change to make, so I'd like to start a discussion from this. The issue here seems to be that the simp lemma [MulAction.orbitRel.Quotient.orbit_mk](https://leanprover-community.github.io/mathlib4_docs/Mathlib/GroupTheory/GroupAction/Defs.html#MulAction.orbitRel.Quotient.orbit_mk) fired and changed the underlying type of variables in the expression, which is not defeq at instance transparency, and fails defeq check for `MulAction` ([MulAction.instElemOrbit](https://leanprover-community.github.io/mathlib4_docs/Mathlib/GroupTheory/GroupAction/Defs.html#MulAction.instElemOrbit) vs [MulAction.instElemOrbit_1](https://leanprover-community.github.io/mathlib4_docs/Mathlib/GroupTheory/GroupAction/Defs.html#MulAction.instElemOrbit_1)). The easy change here is to disable the offending simp, but it feels like a common language pitfall. Should we do either of the following instead?
- remove `MulAction.orbitRel.Quotient.orbit_mk` from default simp set
- Make the the orbit definition more transparent
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|
tech debt
t-group-theory
|
1/2 |
Mathlib/GroupTheory/GroupAction/Basic.lean |
1 |
1 |
['github-actions'] |
jcommelin assignee:jcommelin |
9-85549 9 days ago |
21-23636 21 days ago |
21-23447 21 days |
| 40404 |
felixpernegger author:felixpernegger |
chore(MeasureTheory/Constructions/BorelSpace): remove some `erw`'s |
Extracted from #40348
---
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|
tech debt
t-order
t-measure-probability
|
27/6 |
Mathlib/MeasureTheory/Constructions/BorelSpace/Order.lean,Mathlib/Order/Interval/Set/Basic.lean,Mathlib/Order/OrderDual.lean |
3 |
1 |
['github-actions'] |
nobody |
4-49486 4 days ago |
4-52784 4 days ago |
4-52595 4 days |
| 40420 |
sgouezel author:sgouezel |
chore: remove non-reducible diamond in splitting field |
Currently, `f.SplittingField` has two `K`-algebra structures. The PR fixes this.
---
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|
t-algebra
tech debt
label:t-algebra$ |
3/1 |
Mathlib/FieldTheory/SplittingField/Construction.lean |
1 |
3 |
['github-actions', 'grunweg', 'sgouezel'] |
nobody |
4-25621 4 days ago |
4-31481 4 days ago |
4-31330 4 days |
| 40228 |
thorimur author:thorimur |
chore: clean up `backward.privateInPublic` around `d₂₃` |
Moves a single-use private declaration into a let declaration.
This reduces instructions in that file by ~29% (but this gets swallowed in the overall noise).
Note: currently `LieModule.Cohomology.d₂₃_aux._proof_17` is the biggest proof in mathlib (counted with sharing) :) This PR changes it to `CategoryTheory.Functor.IsDenseSubsite.isIso_ranCounit_app_of_isDenseSubsite`.
---
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t-algebra
tech debt
label:t-algebra$ |
11/17 |
Mathlib/Algebra/Lie/Cochain.lean |
1 |
24 |
['JovanGerb', 'b-mehta', 'github-actions', 'grunweg', 'leanprover-radar', 'mathlib-merge-conflicts', 'thorimur'] |
nobody |
4-16733 4 days ago |
4-22399 4 days ago |
8-52332 8 days |
| 38957 |
wwylele author:wwylele |
chore(GroupTheory/DivisibleHull): remove `backward.privateInPublic` |
---
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|
tech debt
t-group-theory
|
5/12 |
Mathlib/GroupTheory/DivisibleHull.lean |
1 |
13 |
['Komyyy', 'github-actions', 'grunweg', 'jcommelin', 'wwylele'] |
nobody |
4-1534 4 days ago |
19-375 19 days ago |
32-78536 32 days |
| 40392 |
felixpernegger author:felixpernegger |
chore(MeasureTheory/Integral/Lebesgue/Basic): fix an `erw` |
Extracted from #40348.
---
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|
t-measure-probability
tech debt
|
11/1 |
Mathlib/Data/ENNReal/Operations.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Basic.lean |
2 |
1 |
['github-actions'] |
EtienneC30 assignee:EtienneC30 |
3-86207 3 days ago |
4-58846 4 days ago |
4-58657 4 days |
| 40394 |
mathlib-splicebot author:mathlib-splicebot |
chore(MeasureTheory/Measure/Haar/InnerProductSpace: remove an `erw` |
Extracted from #40348. |
t-measure-probability
tech debt
|
7/6 |
Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean |
1 |
4 |
['felixpernegger', 'github-actions'] |
RemyDegenne assignee:RemyDegenne |
3-86207 3 days ago |
4-58242 4 days ago |
4-58053 4 days |
| 40431 |
sgouezel author:sgouezel |
chore: fix non-reducible diamond in C^* algebras |
The following fails before the PR, succeeds after it
```
example : ((instCStarAlgebraSubtypeMemStarSubalgebraComplexElemental
x).toAlgebra : Algebra ℂ ↥(StarAlgebra.elemental ℂ x)) =
(StarAlgebra.elemental ℂ x).algebra := by
with_reducible_and_instances rfl
```
---
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|
t-algebra
tech debt
label:t-algebra$ |
1/0 |
Mathlib/Algebra/Ring/Subsemiring/Basic.lean |
1 |
9 |
['eric-wieser', 'github-actions', 'grunweg', 'leanprover-radar', 'mathlib-bors', 'sgouezel', 'themathqueen'] |
nobody |
3-64856 3 days ago |
4-19119 4 days ago |
4-18961 4 days |
| 40427 |
sgouezel author:sgouezel |
chore: fix non-reducible diamond in `ConjAct` |
The following fails before the PR, suceeds after it
```
example : (ConjAct.instGroupWithZero.toDivInvMonoid : DivInvMonoid (ConjAct G₀)) =
ConjAct.instDivInvMonoid := by
with_reducible_and_instances rfl
```
---
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|
t-group-theory
tech debt
|
20/6 |
Mathlib/Algebra/GroupWithZero/Action/ConjAct.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean |
2 |
2 |
['eric-wieser', 'github-actions'] |
nobody |
3-63655 3 days ago |
4-24738 4 days ago |
4-25605 4 days |
| 40429 |
sgouezel author:sgouezel |
chore: fix non-reducible diamond in AEval |
The following fails before the PR:
```example : ((Module.AEval.instAddCommGroup a).toAdd : Add (Module.AEval R M a)) =
(Module.AEval.instAddCommMonoid a).toAddCommSemigroup.toAddCommMagma.toAdd := by
with_reducible_and_instances rfl
```
It works after the PR, modulo the instance renaming.
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|
t-algebra
tech debt
label:t-algebra$ |
2/5 |
Mathlib/Algebra/Polynomial/Module/AEval.lean |
1 |
1 |
['github-actions'] |
nobody |
3-63639 3 days ago |
4-23385 4 days ago |
4-23196 4 days |
| 40457 |
sgouezel author:sgouezel |
chore: use more `inferInstanceAs` to define instances on type synonyms |
Otherwise, the instance functions are not declared on the right space.
---
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|
t-topology
tech debt
|
42/20 |
Mathlib/Topology/EMetricSpace/Weak.lean,Mathlib/Topology/VectorBundle/Constructions.lean |
2 |
2 |
['github-actions', 'sgouezel'] |
nobody |
3-41846 3 days ago |
3-55068 3 days ago |
3-54879 3 days |
| 40452 |
sgouezel author:sgouezel |
chore: fix non-reducible diamond in tensor product norms |
The following fails before the PR, succeeds after it:
```
example : (PiTensorProduct.instSeminormedAddCommGroup.toNorm : Norm (PiTensorProduct 𝕜 fun i => E i)) =
PiTensorProduct.instNorm := by
with_reducible_and_instances rfl
```
---
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|
tech debt
t-analysis
|
2/2 |
Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean |
1 |
4 |
['github-actions', 'metakunt', 'sgouezel'] |
nobody |
2-52295 2 days ago |
3-63819 3 days ago |
3-63630 3 days |