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blocks |
| 33928 |
jsm28 author:jsm28 |
feat(Combinatorics/Tiling/TileSet): indexed families of tiles |
Define the type `TileSet` for indexed families of tiles (in a discrete context), and some associated definitions (including `symmetryGroup`) and API lemmas.
`TileSet` can be used for tilings of the whole space; for tilings of part of the space; for patches of tiles (extracted from a tiling by considering tiles meeting some set of points, or considered on their own without extracting from a tiling); for multiple tilings (covering the space more than once). In particular, the fact that people study multiple tilings provides a clear justification for using indexed families rather than sets of tiles, and basic definitions and API lemmas generally work for all these different uses of `TileSet` (sometimes with weak constraints such as tiles being finite, nonempty and only having finitely many tiles meeting any point of the space).
Definitions for saying e.g. "this `TileSet` is a tiling of the whole space" are to be included in subsequent files in subsequent PRs.
From AperiodicMonotilesLean.
---
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|
t-combinatorics |
460/0 |
Mathlib.lean,Mathlib/Combinatorics/Tiling/TileSet.lean |
2 |
23 |
['Parcly-Taxel', 'b-mehta', 'eric-wieser', 'github-actions', 'jsm28', 'vihdzp'] |
nobody |
151-5199 4 months ago |
276-22307 276 days ago |
276-22300 276 days |
0 |
| 35069 |
A-M-Berns author:A-M-Berns |
feat(Geometry/Polygon): simple polygons and boundary map |
This PR introduces Simple polygons with the predicate `IsSimple`, which captures the idea of a non-self-intersecting boundary, in the file Simple.lean. In the file Boundary.lean, a boundary map from `AddCircle n` is defined. I prove that the range of this map is the boundary and that this map is injective if and only if the polygon is simple. I kept Boundary.lean and Simple.lean separate because future results will include stuff just about the boundary map independent of simplicity (e.g. that it is continuous in the appropriate setting) and stuff just about simple polygons independent of the boundary map (e.g. that for n = 3, IsSimple iff HasNondegenerateVertices.) I used Claude Code to help generate some of the proof material, but I golfed and edited all AI contribution.
- [x] depends on: #34598
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new-contributor
t-euclidean-geometry
LLM-generated
|
360/0 |
Mathlib.lean,Mathlib/Geometry/Polygon/Boundary.lean,Mathlib/Geometry/Polygon/Simple.lean,Mathlib/Logic/Equiv/Fin/Rotate.lean |
4 |
30 |
['A-M-Berns', 'eric-wieser', 'github-actions', 'joneugster', 'jsm28', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp', 'wwylele'] |
nobody |
147-5200 4 months ago |
233-31055 233 days ago |
235-65334 235 days |
0 |
| 35669 |
SnirBroshi author:SnirBroshi |
feat(Mathlib/Data/Finset/Mex): `sInf sᶜ ≤ s.encard` |
---
It's in a separate file because I couldn't find a sensible place with the required imports, not because "mex" is particularly interesting.
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|
t-order |
59/0 |
Mathlib.lean,Mathlib/Data/Finset/Mex.lean |
2 |
14 |
['SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp'] |
nobody |
107-39660 3 months ago |
107-40206 107 days ago |
111-42653 111 days |
0 |
| 36813 |
AlexeyMilovanov author:AlexeyMilovanov |
feat(Computability.Encoding): add self-delimiting unary and pair encodings |
Adds self-delimiting boolean encodings to `Mathlib.Computability.Encoding`.
**Key changes:**
* **`unaryPrefixEncodingNat`**: A self-delimiting unary `Encoding ℕ Bool`, using the code $1^n0$.
* **`encodingProdBool`**: Builds an `Encoding (α × β) Bool` from boolean encodings of `α` and `β`, by prefixing the length of the first encoded component.
* **`encodingListBool`**: Builds an `Encoding (List α) Bool` from a boolean encoding of `α`, using self-delimiting element encodings.
* **`UnaryPrefix` helpers**: Internal-style helper API for the underlying length-prefixed boolean-list encoding and decoding. |
t-computability
new-contributor
|
98/0 |
Mathlib/Computability/Encoding.lean |
1 |
6 |
['AlexeyMilovanov', 'Komyyy', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts'] |
nobody |
100-38022 3 months ago |
100-38022 100 days ago |
116-80292 116 days |
0 |
| 41429 |
felixpernegger author:felixpernegger |
chore(Combinatorics): remove a `set_option backward.privateInPublic` |
Together with #41410 this removes all but one global `set_option backward.privateInPublic true`
---
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|
t-combinatorics |
8/7 |
Mathlib/Combinatorics/Matroid/Basic.lean,Mathlib/Combinatorics/Matroid/Dual.lean,Mathlib/Combinatorics/Matroid/Loop.lean,Mathlib/Combinatorics/Matroid/Minor/Restrict.lean |
4 |
13 |
['felixpernegger', 'github-actions', 'leanprover-radar', 'mathlib-bors', 'mathlib-merge-conflicts', 'vlad902'] |
nobody |
98-49452 3 months ago |
98-50320 98 days ago |
100-50422 100 days |
0 |
| 41629 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/Subgraph): `neighborSet` of `coe`/`spanningCoe` |
---
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|
t-combinatorics |
15/3 |
Mathlib/Combinatorics/SimpleGraph/Subgraph.lean |
1 |
1 |
['github-actions'] |
nobody |
96-84535 3 months ago |
96-85104 96 days ago |
96-85097 96 days |
0 |
| 41668 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/Decomp): `dropUntil` API to match existing `takeUntil` API |
---
Slightly more complicated theorems than usual "API" though.
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|
t-combinatorics |
56/9 |
Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean |
1 |
1 |
['github-actions'] |
nobody |
94-81162 3 months ago |
94-81730 94 days ago |
95-86013 95 days |
0 |
| 41722 |
SnirBroshi author:SnirBroshi |
feat(SimpleGraph/Connectivity/Subgraph): `mapToSubgraph` API |
---
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|
t-combinatorics |
36/0 |
Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean |
1 |
1 |
['github-actions'] |
nobody |
94-67075 3 months ago |
94-67681 94 days ago |
94-67674 94 days |
1 |
| 41793 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph): `fromEdgeSet edgeSet` for subgraphs and walks |
`fromEdgeSet G'.edgeSet = G'.spanningCoe` for a subgraph `G'`
`fromEdgeSet p.edgeSet = p.toSubgraph.spanningCoe` for a walk `p`
---
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|
t-combinatorics |
16/2 |
Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean |
3 |
1 |
['github-actions'] |
nobody |
93-21429 3 months ago |
93-22006 93 days ago |
93-21999 93 days |
0 |
| 36719 |
NoneMore author:NoneMore |
feat(ModelTheory): add `PartialType` for first-order theories |
This PR adds the definitions of partial types over theories and over parameter sets, and proves several equivalent characterizations.
---
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|
t-logic
new-contributor
|
432/17 |
Mathlib.lean,Mathlib/ModelTheory/PartialTypes.lean,Mathlib/ModelTheory/Semantics.lean |
3 |
7 |
['NoneMore', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp'] |
nobody |
93-2921 3 months ago |
93-3442 93 days ago |
100-72796 100 days |
0 |
| 41821 |
Timeroot author:Timeroot |
chore(Order/Basic): add grind _=_ to Subtype.coe_lt_coe, coe_le_coe |
Add grind annotations to Subtype.coe_le_coe and Subtype.coe_lt_coe.
As noted in [this zulip thread](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/grind.20failures/near/610812085), grind was failing to solve some fairly simple goals, and I think these are generally good annotations to have. (I think they will usually fire usefully.)
---
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[](https://gitpod.io/from-referrer/)
|
t-order |
2/2 |
Mathlib/Order/Basic.lean |
1 |
4 |
['Timeroot', 'github-actions', 'leanprover-radar'] |
nobody |
92-37534 3 months ago |
92-42937 92 days ago |
92-42930 92 days |
0 |
| 41583 |
kim-em author:kim-em |
chore: move simple_obj into Functor namespace, golf proofs, tidy docstring |
This PR moves `CategoryTheory.simple_obj` and `CategoryTheory.simple_obj_iff` into the `Functor` namespace (matching their sibling `Functor.simple_of_simple_obj` and enabling dot notation), golf `Functor.simple_obj` and the forward direction of `isSimpleModule_iff_eq_zero_or_injective` via the existing `LinearMap.injective_or_eq_zero`, remove unused `variable` binders in `RingTheory/SimpleRing/DivisionRing.lean`, and fix inverted heading levels and an "an unique" typo in that file's module docstring. The one call site of the renamed lemmas is updated; no deprecated aliases are added since the declarations merged a week ago.
Follow-up to [#41233 (feat(SimpleRing/DivisionRing): simple module is preserved by ModuleCat equivs)](https://github.com/leanprover-community/mathlib4/pull/41233).
🤖 Prepared with Claude Code
|
LLM-generated |
16/19 |
Mathlib/CategoryTheory/Simple.lean,Mathlib/RingTheory/SimpleRing/DivisionRing.lean |
2 |
1 |
['github-actions'] |
nobody |
90-37475 2 months ago |
90-37475 90 days ago |
90-37468 90 days |
0 |
| 41934 |
NickKobs author:NickKobs |
feat(Order/Nucleus): a nucleus on a Boolean algebra is closed |
Adds `Mathlib/Order/Nucleus/Boolean.lean` — the Boolean specialization of the nucleus API:
```lean
theorem Nucleus.apply_eq_sup_apply_bot [BooleanAlgebra X] (n : Nucleus X) (a : X) :
n a = a ⊔ n ⊥
theorem Nucleus.isClosed_of_booleanAlgebra [BooleanAlgebra X] (n : Nucleus X) :
⇑n = fun a => a ⊔ n ⊥
theorem Nucleus.eq_of_apply_bot_eq [BooleanAlgebra X] {m n : Nucleus X} (h : m ⊥ = n ⊥) :
m = n
```
**Why.** `Mathlib.Order.Nucleus` provides the frame / Heyting-algebra structure of `Nucleus X`, the closure-operator view (`toClosureOperator`), and the pointwise `le_apply` / `idempotent` / `map_inf` API, but no Boolean specialization. On a Boolean algebra every nucleus is *closed* — completely determined by its value at `⊥` — which is the pointwise algebraic core of the classical fact that the assembly `N(L)` is Boolean iff `L` is (Beazer–Macnab; Simmons; Johnstone, *Stone Spaces*, II.2). It is the natural companion to the existing frame structure and a common building block in point-free topology.
**Proof.** `n a = n a ⊓ (a ⊔ aᶜ) = (n a ⊓ a) ⊔ (n a ⊓ aᶜ)`; the left join-and is `a` (inflationarity), the right is `≤ n a ⊓ n aᶜ = n (a ⊓ aᶜ) = n ⊥` (inflationarity of `aᶜ` + `map_inf`). The reverse inequality is inflationarity plus monotonicity applied to `⊥ ≤ a`. No completeness is needed — the statement is pointwise, so `[BooleanAlgebra X]` (not a complete Boolean algebra) suffices.
**References.**
* R. Beazer, D. S. Macnab, *Modal extensions of Heyting algebras*.
* H. Simmons, *A framework for topology*, Logic Colloquium '77.
* P. T. Johnstone, *Stone Spaces*, CUP (1982), II.2.
**Provenance.** The theorem was first mechanized (Mathlib-free, over a finite Boolean frame) in the BETTI/Araksha refusal-algebra work; this PR is the generalization to an arbitrary `BooleanAlgebra` against Mathlib's own `Nucleus` API. The result is classical open mathematics, cited above. An earlier revision of the file was compiled clean against master `c81c5cbb` (Lean `v4.33.0-rc1`); this revision adapts the header to the module system (`module` / `public import` / `@[expose] public section`).
|
t-order
new-contributor
LLM-generated
|
71/0 |
Mathlib.lean,Mathlib/Order/Nucleus/Boolean.lean |
2 |
5 |
['felixpernegger', 'github-actions'] |
nobody |
89-5957 2 months ago |
89-19700 89 days ago |
89-19693 89 days |
0 |
| 42047 |
LegaSage author:LegaSage |
feat(RingTheory): add locally nilpotent derivations |
This introduces `Derivation.IsLocallyNilpotent` and basic iteration lemmas for locally nilpotent derivations. The main result is the method-style theorem `Derivation.IsLocallyNilpotent.apply_eq_zero_of_dvd`: over a characteristic-zero domain, if `f ∣ D f` for a locally nilpotent derivation `D`, then `D f = 0`.
The proof uses the iterated Leibniz rule and the top nonvanishing iterates of the two factors.
-----
The implementation and PR text were prepared with assistance from OpenAI Codex. |
t-ring-theory
new-contributor
LLM-generated
|
167/0 |
Mathlib.lean,Mathlib/RingTheory/Derivation/LocallyNilpotent.lean |
2 |
2 |
['github-actions'] |
nobody |
84-52297 2 months ago |
85-3886 85 days ago |
85-3879 85 days |
0 |
| 42226 |
espottesmith author:espottesmith |
feat(Combinatorics/Hypergraph): add restriction `x ≠ y` to hypergraph vertex and edge adjacency |
---
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This introduces a small change to the definitions of adjacency and edge-adjacency for undirected hypergraphs, based on a conversation with @Jun2M and @b-mehta in [#28613](https://github.com/leanprover-community/mathlib4/pull/28613).
Previously, any two vertices (edges) `x` and `y` could be adjacent, provided that there was an edge in the edge set containing both of them (there was a vertex contained in both of them). Now, we add the restriction that `x` is not equal to `y`.
This should allow `SimpleGraph` to be a clean specialization of `Hypergraph` and to ease the eventual implementation of walks.
This PR has no dependencies, but see also [42164](https://github.com/leanprover-community/mathlib4/pull/42162), @Jun2M's implementation of `HyperGraphLike` and formalization that `Hypergraph`s are `HyperGraphLike`, which includes this restriction on `Adj`.
[](https://gitpod.io/from-referrer/)
|
t-combinatorics
new-contributor
|
4/4 |
Mathlib/Combinatorics/Hypergraph/Basic.lean |
1 |
3 |
['github-actions'] |
nobody |
79-64746 2 months ago |
79-65312 79 days ago |
79-65305 79 days |
0 |
| 42223 |
cameronfreer author:cameronfreer |
feat(Computability/Reduce): the halting problem is many-one complete |
`Mathlib/Computability/Halting.lean` proves that the halting problem is recursively enumerable (`ComputablePred.halting_problem_re`) and not computable (`ComputablePred.halting_problem`), but not that it is complete: there is no `REPred R → R ≤₀ K`, and neither `Halting.lean` nor `RE.lean` mentions `≤₀`.
This PR adds three results:
```lean
theorem REPred.manyOneReducible_halting_problem {R : ℕ → Prop} (h : REPred R) (n : ℕ) :
R ≤₀ fun c : Code => (Code.eval c n).Dom
theorem halting_problem_manyOneEquiv_halting_problem₂ (n : ℕ) :
ManyOneEquiv (fun c : Code => (Code.eval c n).Dom)
(fun p : Code × ℕ => (Code.eval p.1 p.2).Dom)
theorem REPred.manyOneReducible_halting_problem₂ {R : ℕ → Prop} (h : REPred R) :
R ≤₀ fun p : Code × ℕ => (Code.eval p.1 p.2).Dom
```
(I've stated the results in `Reduce.lean` rather than alongside the other halting-problem results because `≤₀` is defined here, and `Reduce` imports `Halting` rather than the other way around.)
🤖 These proofs were written with the assistance of Claude Opus 5 high and reviewed by GPT Sol 5.6 xhigh.
|
t-computability
new-contributor
LLM-generated
|
41/0 |
Mathlib/Computability/Reduce.lean |
1 |
3 |
['cameronfreer', 'github-actions'] |
nobody |
78-41435 2 months ago |
79-69243 79 days ago |
79-69236 79 days |
0 |
| 42189 |
cameronfreer author:cameronfreer |
feat(ModelTheory/Basic): add characterization of languages with countably many symbols |
`Language.Countable.countable_functions` currently projects `Countable L.Symbols` onto the function symbols, but there is no counterpart for relations. This PR adds the missing instance; in doing so it relates the two ways that Mathlib already expresses "countable language": the bundled `Language.card ≤ ℵ₀` and the unbundled `Countable (Σ l, L.Functions l)` / `Countable (Σ l, L.Relations l)` hypotheses that model-theoretic statements tend to carry separately.
* `Countable.countable_relations`, `countable_symbols_iff`, and `card_le_aleph0_iff_countable` connect the bundled and unbundled formulations of symbol countability.
* `Countable.countable_sum`, `Countable.countable_constantsOn`, and `Countable.countable_withConstants` centralize countability instances for language constructors and remove the corresponding local instances from `Encoding.lean`.
## Motivation
Following review feedback from @NoneMore, this PR now also simplifies existing Mathlib code: generic countability instances for `Language.sum`, `constantsOn`, and `withConstants` live beside those constructors, so `Encoding.lean` no longer needs its own cardinal-arithmetic proofs for them.
The broader motivation comes from projects in infinitary model theory that build on Mathlib, in which one typically needs to carry around a hypothesis about countability of the set of symbols.
Specifically, in [cameronfreer/infinitary-logic](https://github.com/cameronfreer/infinitary-logic) the two sorts are carried unbundled and independently throughout; there are roughly 180 occurrences of the relation-symbol hypothesis and 24 of the function-symbol one. Here are a few examples:
* [`Methods/Henkin/ModelExistence.lean#L60`](https://github.com/cameronfreer/infinitary-logic/blob/1a478e80794080a536931c029281bb65266b3171/InfinitaryLogic/Methods/Henkin/ModelExistence.lean#L60): model existence, carrying both hypotheses side by side;
* [`Admissible/Compactness.lean#L90`](https://github.com/cameronfreer/infinitary-logic/blob/1a478e80794080a536931c029281bb65266b3171/InfinitaryLogic/Admissible/Compactness.lean#L90): Barwise completeness, likewise;
* [`Descriptive/Polish.lean#L46`](https://github.com/cameronfreer/infinitary-logic/blob/1a478e80794080a536931c029281bb65266b3171/InfinitaryLogic/Descriptive/Polish.lean#L46): a section variable assuming only the relation symbols are countable, which is where one notices the missing companion instance;
* [`Methods/LopezEscobar/CodeClass.lean#L29`](https://github.com/cameronfreer/infinitary-logic/blob/1a478e80794080a536931c029281bb65266b3171/InfinitaryLogic/Methods/LopezEscobar/CodeClass.lean#L29): a custom `Countable (Σ n, L.Functions n)` instance for relational languages, which is an example of the bookkeeping that arises from the two sorts not being related by a single lemma.
(Note that the `countable_functions` and `countable_relations` instances only project *out of* `Countable L.Symbols` into a summand; the converse direction is stated as a theorem rather than an instance, so there is no risk of an instance cycle.)
🤖 These proofs were written with the assistance of Claude Opus 5 high and reviewed by GPT Sol 5.6 xhigh.
|
t-logic
new-contributor
LLM-generated
|
33/12 |
Mathlib/ModelTheory/Basic.lean,Mathlib/ModelTheory/Encoding.lean,Mathlib/ModelTheory/LanguageMap.lean |
3 |
5 |
['NoneMore', 'cameronfreer', 'github-actions'] |
nobody |
78-41409 2 months ago |
79-68181 79 days ago |
79-71382 79 days |
0 |
| 42178 |
cameronfreer author:cameronfreer |
feat(Computability/Primrec/List): add theorems showing that List.all, List.any and List.sum are primitive recursive |
Add the parameterized `list_all`, `list_any` and natural-number `list_sum`, in the style of the existing `list_map`, `list_foldr` and `list_findIdx`.
Mathlib already has a parameterized core, but no direct lemmas for these standard list operations, so downstream developments tend to reconstruct them from `list_foldr` at each use site. In the course of writing [cameronfreer/computable-analysis](https://github.com/cameronfreer/computable-analysis) I ended up needing this in three places, all of which can now make use of the results here instead (see [a6898b5](https://github.com/cameronfreer/computable-analysis/commit/a6898b5), in particular `Weihrauch/Principles/Limit.lean:117`, `TypeTwo/PrefixTable.lean:334,351,369`, and `Measure/DisintegrateLower.lean:877,902`).
:robot: These proofs were written with the assistance of Claude Opus 5 high and reviewed by GPT Sol 5.6 xhigh. |
t-computability
new-contributor
LLM-generated
|
21/1 |
Mathlib/Computability/Primrec/List.lean |
1 |
4 |
['cameronfreer', 'github-actions'] |
nobody |
78-41402 2 months ago |
80-61327 80 days ago |
80-61320 80 days |
0 |
| 42113 |
LAC1213 author:LAC1213 |
feat(RingTheory/Noetherian): injective modules over a Noetherian ring… |
… surject onto localizations by powers of an element. [Hartshorne III.3.3]
Disclaimer: I used Claude to help me find the names of useful lemmas and definitions and explain lean errors to me.
---
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory
new-contributor
LLM-generated
|
114/0 |
Mathlib.lean,Mathlib/Algebra/Module/Torsion/Basic.lean,Mathlib/RingTheory/Noetherian/InjectiveModule.lean |
3 |
42 |
['LAC1213', 'NoahW314', 'github-actions', 'robin-carlier'] |
nobody |
76-11073 2 months ago |
81-45662 81 days ago |
81-70383 81 days |
0 |
| 42513 |
plp127 author:plp127 |
feat(ModelTheory): typeclass for theory to have nonempty models |
We add a typeclass for a theory to have nonempty models. We provide instances for `nonemptyTheory`, `infiniteTheory`, and `completeTheory`.
---
- [x] depends on: #42508
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[](https://gitpod.io/from-referrer/)
|
t-logic |
51/0 |
Mathlib/ModelTheory/Algebra/Ring/Basic.lean,Mathlib/ModelTheory/Semantics.lean |
2 |
2 |
['github-actions', 'mathlib-dependent-issues'] |
nobody |
70-50639 2 months ago |
70-58118 70 days ago |
70-60661 70 days |
1 |
| 40741 |
AntoineduFresne author:AntoineduFresne |
feat(order): dilworth's and mirsky's theorems for finite orders |
I add Dilworth's theorem and its order dual, Mirsky's theorem, for finite subsets of a partial order, together with the order-theoretic lemmas they rest on.
A prior external formalization by Vlad Tsyrklevich is linked from `1000.yaml`; this is an independent `Finset`-based development using Galvin's proof, and I agreed the `1000.yaml` update with him.
I split the min-max content, as for Hall's marriage theorem, into a weak-duality inequality and a strong-duality existence of a matching pair, so I never define an extremal quantity over families of sets (no `Finset.min'` / `Finset.max'`):
- `dilworth` / `mirsky` — an antichain and a chain cover (resp. a chain and an antichain cover) of equal size;
- `antichain_le_chain_cover` / `chain_le_antichain_cover` — the weak-duality inequalities, for an arbitrary relation;
- `dilworth_partition` / `mirsky_partition` — the same with a pairwise-disjoint partition.
For Dilworth I use Galvin's induction (gluing step `chainCover_glue`); I avoid the König /
bipartite-matching route since König isn't in Mathlib yet (at least last time I checked). I prove Mirsky directly (peeling off minimal elements) rather than via `OrderDual`, since the direct induction seems simpler to me and the two proofs already share their foundations (the closure lemmas and the injective weak dualities).
Internally I work with an injection `f : α → Finset α` on the antichain rather than with the
`Finset (Finset α)` cover directly, so distinctness of the chains comes from the antichain property instead of a separate bookkeeping.
## Questions I'd like input on
1. Explicit min-max? I give weak duality plus a matching pair, from which "largest antichain = smallest chain cover" follows; I do not state that equality as a single theorem (doing so would, I think, mean defining the extremal quantities I wanted to avoid). Would you also like an explicit min-max statement?
2. Two layers of weak duality. I expose it twice: an injective form (`IsAntichain.exists_injOn_mem_chains`, over an arbitrary relation and an arbitrary index type, no finiteness) and a `Finset` cardinality form (`antichain_le_chain_cover`), the latter a one-line specialization of the former. I'm not sure whether exposing both is right, or whether one of them should be canonical. And is there appetite to push the general core to an `ℕ∞` / infinite version, or is the finite form the right scope here?
3. `[DecidableEq α]` on the main theorems. It comes only from writing the cover as
`s = 𝒞.biUnion id` (`Finset.biUnion` needs it); a membership-form coverage condition such as `∀ x, x ∈ s ↔ ∃ C ∈ 𝒞, x ∈ C` would drop the assumption, though it seems to me a bit less readable. Which do you prefer? (I think the injective-form weak dualities assume neither order, finiteness, nor `DecidableEq`.)
4. Naming. I use `C` / `A` for a chain / antichain and `𝒞` / `𝒜` for a chain / antichain cover (for hopefully obvious reason). Happy to change these if you would prefer something else.
## Open questions
- File placement (`Mathlib/Order/Dilworth.lean`?), and whether the general lemmas (the injective transversal and the weak dualities) should live in `Mathlib/Order/Antichain.lean` rather than in a new file.
The maximal-antichain closure lemma that was originally here has been split out into #42590.
Zulip: https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Antoine.20du.20Fresne.20von.20Hohenesche/with/604112426
AI use: I worked out all proofs on paper first and most of the design structure of the file. I then used Claude Code (Claude Opus) to transcribe my paper proofs into Lean, weaken hypotheses, reduce redundancy, and fix comment typos.
|
t-order
new-contributor
LLM-generated
|
568/3 |
Mathlib.lean,Mathlib/Order/Dilworth.lean,docs/1000.yaml |
3 |
18 |
['AntoineduFresne', 'SnirBroshi', 'github-actions', 'tdwag123'] |
nobody |
68-61316 2 months ago |
68-61948 68 days ago |
120-70406 120 days |
0 |
| 42624 |
xgenereux author:xgenereux |
perf(IntermediateField/Basic): algebra instance for IntermediateField.restrictScalars |
Add `Algebra` / `IsScalarTower` instance for `IntermediateField.restrictScalars`.
This simplifies a proof in `FunctionField.lean`.
I also tried to hunt for another similar application and found one in `Mathlib.FieldTheory.Extension`.
AI disclaimer: I asked an AI assistant to suggest an improvement to the proof in the FunctionField.lean file. This PR is the result of this discussion.
---
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|
t-algebra label:t-algebra$ |
9/12 |
Mathlib/FieldTheory/Extension.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/NumberTheory/FunctionField.lean |
3 |
6 |
['github-actions', 'leanprover-radar', 'xgenereux'] |
nobody |
67-13318 2 months ago |
67-16839 67 days ago |
67-16832 67 days |
0 |
| 42265 |
cameronfreer author:cameronfreer |
chore(RingTheory/PowerSeries): simplify coeff_inv_aux |
This replaces the hand-written `Finset.sum_nbij'` in `coeff_inv_aux` with `simp_rw` + `simp`, via `Finsupp.antidiagonal_single`, the same rewrite that `PowerSeries.coeff_mul` already uses.
:robot: Golfing target found by GPT Pro 5.6 Sol, initial version of code written by Opus 5 high, refined by GPT 5.6 Sol xhigh, then again by Opus 5 high following @felixpernegger's review suggestion. |
t-ring-theory
new-contributor
LLM-generated
|
2/19 |
Mathlib/RingTheory/PowerSeries/Inverse.lean |
1 |
8 |
['cameronfreer', 'felixpernegger', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts'] |
nobody |
66-33270 2 months ago |
66-33970 66 days ago |
78-61373 78 days |
0 |
| 42639 |
Raph-DG author:Raph-DG |
feat(Order): krullDimLE characterisation |
In this PR, we show that a preorder has krull dim at most n if and only if every element with coheight greater than n is minimal (+ the dual version and some small corollaries).
---
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|
t-order |
42/0 |
Mathlib/Order/KrullDimension.lean |
1 |
2 |
['github-actions'] |
nobody |
65-65216 2 months ago |
65-66944 65 days ago |
65-69970 65 days |
0 |
| 42629 |
SnirBroshi author:SnirBroshi |
feat(Order/RelSeries): `FiniteDimensionalOrder` implies `WellFoundedLT` |
and `WellFoundedGT`
---
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|
t-order |
13/0 |
Mathlib/Order/RelSeries.lean |
1 |
6 |
['SnirBroshi', 'github-actions', 'plp127', 'vihdzp'] |
nobody |
65-61787 2 months ago |
65-78394 65 days ago |
65-80425 65 days |
0 |
| 42718 |
justinhalford author:justinhalford |
feat(Combinatorics/SetFamily): the linear algebra method and the Oddtown theorem |
Adds the basic form of the **linear algebra method** for set families (Babai–Frankl) together with its standard first application, the **Oddtown theorem** (Berlekamp, 1969).
### What's here
- `linearIndependent_of_dotProduct_eq_ite` — a family of vectors whose pairwise dot products form the identity matrix is linearly independent. Stated over an arbitrary field, so it does not rely on positivity; this is the engine of the method.
- `Finset.charVec` — the characteristic vector of a finset, valued in a semiring, with `charVec_apply`.
- `Finset.charVec_dotProduct_charVec` — the dot product of two characteristic vectors is the cardinality of the intersection.
- `Finset.card_le_card_of_odd_card_of_even_card_inter` — **Oddtown**: a family of finsets of odd cardinality, any two of which meet in an even number of elements, has at most `Fintype.card α` members.
### Why
I could not find the linear algebra method anywhere in Mathlib. Searching for `Oddtown`, `Eventown`, Fisher's inequality, `RayChaudhuri` and `FranklWilson` returns nothing, and exactly one file under `Mathlib/Combinatorics/` uses `finrank`/`LinearIndependent` (`SimpleGraph/LapMatrix.lean`, for spectral graph theory). Since the technique underlies a large family of extremal results, the general lemma is stated separately from Oddtown so that Eventown, Fisher's inequality and Ray-Chaudhuri–Wilson can be added on top later.
If this does already exist under a formulation I did not think to search for, I would be glad to be pointed at it.
### Verification
Compiles against `master` (Lean 4.34.0-rc1) with no errors or warnings. `#print axioms` on each of the three results reports only `[propext, Classical.choice, Quot.sound]`. No `sorry`, no new axioms, no `set_option` overrides.
### Disclosure
This file was written with AI assistance (Claude Opus 5) and then checked against the Lean kernel; that is noted in the module docstring as well. Every statement, proof and docstring has been read through by me before submission. Happy to adjust naming, generality or placement to whatever the maintainers prefer.
### Process note
I am a first-time contributor and I am aware the usual convention is to raise a new file on Zulip before opening a PR. Apologies for going in the other order — I am glad to move the discussion to `#mathlib4` if that is preferred, or to close this if the material is not wanted.
---
[](https://gitpod.io/#https://github.com/leanprover-community/mathlib4)
|
t-combinatorics
new-contributor
|
144/0 |
Mathlib.lean,Mathlib/Combinatorics/SetFamily/Oddtown.lean |
2 |
3 |
['D-Thomine', 'github-actions'] |
nobody |
64-55267 2 months ago |
64-59751 64 days ago |
64-59744 64 days |
0 |
| 42343 |
brianrabern author:brianrabern |
feat(Combinatorics/SimpleGraph): extend a coloring to one more vertex |
Add `Colorable.of_induce_compl_singleton`: if deleting a vertex `v` leaves an `n`-colourable graph and `deg(v) < n`, then `G` itself is `n`-colourable.
This is a local colouring-extension / induction step (colour `G - v`, then assign `v` a free colour). It is useful for inductive arguments such as Brooks' theorem. The global greedy bound `χ ≤ Δ + 1` is developed separately in #38357.
AI assistance: LLM was used to smooth it out and put things in the expected style
---
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[](https://gitpod.io/from-referrer/) |
t-combinatorics
new-contributor
LLM-generated
|
35/0 |
Mathlib/Combinatorics/SimpleGraph/Coloring/Vertex.lean |
1 |
11 |
['Parcly-Taxel', 'SnirBroshi', 'bocowgill', 'brianrabern', 'github-actions'] |
nobody |
64-17229 2 months ago |
73-38662 73 days ago |
75-80175 75 days |
0 |
| 42471 |
mo271 author:mo271 |
feat(RingTheory/LaurentSeries): add Leibniz rule |
This adds `hasseDeriv_mul` and `derivative_mul`.
Written with the help of Gemini
---
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|
t-ring-theory
LLM-generated
|
101/0 |
Mathlib/RingTheory/LaurentSeries.lean |
1 |
10 |
['felixpernegger', 'github-actions', 'mathlib-bors', 'mo271', 'wwylele'] |
nobody |
63-66529 2 months ago |
63-66529 63 days ago |
69-64798 69 days |
0 |
| 42788 |
andreylukin author:andreylukin |
feat(Combinatorics/Sperner): define facet incidence data |
## Summary
Adds a small finite facet-ridge incidence interface intended as a prerequisite for the general Sperner lemma (#25231).
- defines finite facets, ridges, and their incidence relation;
- assumes every ridge has one or two cofacets;
- defines boundary and interior ridges and proves that they are disjoint and partition the ridges.
This deliberately does not claim the geometric Sperner theorem. A future development must connect finite triangulations of the standard simplex to this incidence interface and establish the required coface-count property.
## Validation
- `lake build Mathlib.Combinatorics.Sperner.Basic`
- `lake env lean -DwarningAsError=false Mathlib.lean`
Towards #25231
|
t-combinatorics
new-contributor
|
117/0 |
Mathlib.lean,Mathlib/Combinatorics/Sperner/Basic.lean |
2 |
2 |
['github-actions'] |
nobody |
62-36733 2 months ago |
62-39428 62 days ago |
62-39541 62 days |
0 |
| 42758 |
cameronfreer author:cameronfreer |
feat(ModelTheory): add syntax and semantics for infinitary logic |
Add basic syntax and semantics for infinitary model theory of L∞ω (and Lω₁ω).
The new `BoundedFormulaInf L ι α n` uses index type `ι` for all of a formula's infinitary conjunctions and disjunctions, and the definitional
```lean
abbrev BoundedFormulaω (α : Type u') (n : ℕ) := L.BoundedFormulaInf ℕ α n
```
lands in exactly the universe of the finitary `BoundedFormula`, as suggested by @plp127 in [#mathlib4 > ModelTheory: API for infinitary formulas of L_{∞,ω} @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/ModelTheory.3A.20API.20for.20infinitary.20formulas.20of.20L_.7B.E2.88.9E.2C.CF.89.7D/near/613390601).
This PR contains `iSup`/`iInf` constructors, derived connectives together with `alls`/`exs`, `Realize` with `simp` lemmas for every constructor and derived connective, and the embedding `BoundedFormula.toInf` with `realize_toInf`.
I developed this with extensive assistance from several Claude and GPT models along with [lean4-skills](https://github.com/cameronfreer/lean4-skills) and [lean-lsp-mcp](https://github.com/oOo0oOo/lean-lsp-mcp) as part of the ongoing project [cameronfreer/infinitary-logic](https://github.com/cameronfreer/infinitary-logic/). |
t-logic
LLM-generated
new-contributor
|
446/0 |
Mathlib.lean,Mathlib/ModelTheory/Infinitary/Semantics.lean,Mathlib/ModelTheory/Infinitary/Syntax.lean,MathlibTest/InfinitarySyntax.lean |
4 |
4 |
['cameronfreer', 'github-actions'] |
nobody |
62-21371 2 months ago |
64-4272 64 days ago |
64-4265 64 days |
0 |
| 42819 |
SnirBroshi author:SnirBroshi |
feat(Order/ConditionallyCompleteLattice/Indexed): a binary function achieves its minimum |
In a `ConditionallyCompleteLinearOrder` with `WellFoundedLT`.
Also spell the existing unary version as `∃ i, f i = ⨅ i, f i` instead of `iInf f ∈ range f`.
---
Dual theorems are blocked by #39438
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t-order |
16/10 |
Mathlib/Combinatorics/SimpleGraph/Girth.lean,Mathlib/Data/ENat/Lattice.lean,Mathlib/Dynamics/TopologicalEntropy/CoverEntropy.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean,Mathlib/SetTheory/Cardinal/Cofinality/Basic.lean,Mathlib/SetTheory/Ordinal/Basic.lean |
6 |
1 |
['github-actions'] |
nobody |
61-50673 2 months ago |
61-53141 61 days ago |
61-53952 61 days |
0 |
| 38055 |
felixpernegger author:felixpernegger |
feat(Topology/EMetricSpace): add r-variation |
Redoing #37007 (I had accidently deleted my fork which nuked the PR).
See https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/p-variation for discussion.
---
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|
t-topology
t-analysis
|
395/0 |
Mathlib.lean,Mathlib/Topology/EMetricSpace/RVariation.lean |
2 |
22 |
['felixpernegger', 'github-actions', 'luigi-massacci', 'luigimassacci-ax', 'mathlib-merge-conflicts'] |
nobody |
61-5201 2 months ago |
72-54063 72 days ago |
177-47298 177 days |
0 |
| 42540 |
shaikidris author:shaikidris |
feat(Combinatorics): asymptotic / natural density and linear-growth bridge |
Redefines asymptotic / natural density around a shared finite relative-density profile, instead of density along `SummationFilter`s.
* `Set.partialDensity S A b` — proportion of `A ∩ Iio b` in `S`
* `Set.lowerDensity` / `Set.upperDensity` — liminf / limsup of that profile
* `Set.HasDensity` — convergence of the profile; `Set.HasNaturalDensity` — `ℕ` case with `A = univ`
* Basic API: `[0,1]` bounds, empty/univ, finite sets have density `0`, `Finset.range` characterizations
* Drops the filter-parametric layer and the junk-valued `naturalDensity`
* Opt-in `Mathlib.Combinatorics.AsymptoticDensity.LinearGrowth`: exact lower/upper density equalities for the counting function `n ↦ #{x ∈ Finset.range n | x ∈ S}`, with no `LinearGrowth` dependency on the core density module
* Retargets the Schnirelmann TODO to this module; Schnirelmann-density comparison proofs are left for follow-up (the linear-growth bridge is proved here)
AI disclosure: this PR is primarily LLM-generated (OpenAI Codex). I reviewed the design (with review comments feedback), public APIs and edge-cases.
I primarily used these as part of my other project on quantitative descent and I think there is a merit in reusability.
---
---
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|
new-contributor
t-combinatorics
LLM-generated
|
358/2 |
Mathlib.lean,Mathlib/Combinatorics/AsymptoticDensity.lean,Mathlib/Combinatorics/AsymptoticDensity/LinearGrowth.lean,Mathlib/Combinatorics/Schnirelmann.lean |
4 |
16 |
['D-Thomine', 'b-mehta', 'github-actions', 'jcommelin', 'mathlib-bors', 'shaikidris', 'wwylele'] |
nobody |
60-59129 1 month ago |
66-62839 66 days ago |
69-81024 69 days |
0 |
| 42775 |
hawkrobe author:hawkrobe |
feat(RingTheory/HopfAlgebra): construct Hopf algebras from generators |
Upgrade a bialgebra to a Hopf algebra from antipode data on an algebra-generating set (`HopfAlgebra.ofGenerators`), plus the primitive-element form `HopfAlgebra.ofPrimitives`. Split out of #39841.
This looks more elegant using Sweedler notation (this proof was taken from a comment in #31898) but mathlib doesn't have the notation available as far as I know.
- [x] depends on: #39841 |
t-ring-theory
new-contributor
|
153/6 |
Mathlib.lean,Mathlib/RingTheory/HopfAlgebra/Generators.lean,Mathlib/RingTheory/HopfAlgebra/Primitive.lean |
3 |
3 |
['github-actions', 'mathlib-dependent-issues'] |
nobody |
59-60952 1 month ago |
60-73940 60 days ago |
61-2409 61 days |
1 |
| 42956 |
SnirBroshi author:SnirBroshi |
feat(SimpleGraph/Walk/Chord): chords of `Walk.map` |
---
Not sure if `Chord.lean` should import `Maps.lean` or vice versa.
Importing both from `Copy.lean` would avoid `large-import`, but I don't think that's right.
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t-combinatorics
large-import
|
38/2 |
Mathlib/Combinatorics/SimpleGraph/Walk/Chord.lean |
1 |
1 |
['github-actions'] |
nobody |
56-31198 1 month ago |
58-19746 58 days ago |
58-19739 58 days |
0 |
| 41522 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/Paths): existence of longest paths/trails/cycles/circuits |
We already have the existence of a longest path/trail. This adds:
- the existence of a longest cycle/circuit
- the existence of a longest path/trail from a specific vertex
- the existence of a longest path/trail between specific endpoints
- the existence of a longest cycle/circuit at a specific vertex
---
`exists_isTrail_forall_length_le_of_pred` is the common argument that works for any predicate on trails, which is then used to prove the 10 versions mentioned above.
I know this looks a bit ugly, but taking a longest path/trail/cycle/circuit is a useful proof technique.
Also, that predicate version might be useful to get Kempe chains, although I haven't tried it.
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t-combinatorics |
128/22 |
Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean |
3 |
1 |
['github-actions'] |
nobody |
56-31152 1 month ago |
56-35046 56 days ago |
99-78119 99 days |
0 |
| 42561 |
SnirBroshi author:SnirBroshi |
feat(Order/RelSeries): order series by refinement |
Define a partial order on `RelSeries`, add basic lemmas for the operations (e.g. `p < p.append q`), and relate to `IsChain` on sets.
This lets us spell "maximal chain" using series.
---
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|
tech debt
t-order
|
150/6 |
Mathlib/Order/RelSeries.lean |
1 |
1 |
['github-actions'] |
nobody |
55-69088 1 month ago |
69-66555 69 days ago |
69-79195 69 days |
0 |
| 43048 |
alreadydone author:alreadydone |
feat(Counterexamples): an invertible semimodule of different cardinality than the semiring |
example due to Sixuan Gu (CUHKSZ) and Wei Qi (Ohio State U)
---
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|
t-algebra label:t-algebra$ |
183/0 |
Counterexamples.lean,Counterexamples/CommSemiring7InvertibleModule6.lean,Mathlib/RingTheory/Spectrum/Maximal/Basic.lean |
3 |
1 |
['github-actions'] |
nobody |
55-23787 1 month ago |
55-25920 55 days ago |
55-25913 55 days |
0 |
| 43029 |
harahu author:harahu |
chore(RingTheory): tidy markdown headers |
This PR:
- ensures all files in `Mathlib/RingTheory` have one and only one H1 header,
- better aligns some H2 headers with the style guide.
For files missing a module header, new headers were authored by Claude Opus 5.
---
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|
t-ring-theory |
48/36 |
Mathlib/RingTheory/AdicCompletion/LocalRing.lean,Mathlib/RingTheory/Algebraic/StronglyTranscendental.lean,Mathlib/RingTheory/DedekindDomain/GaussLemma.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,Mathlib/RingTheory/HopkinsLevitzki.lean,Mathlib/RingTheory/Ideal/IdempotentFG.lean,Mathlib/RingTheory/Jacobson/Radical.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/LocalRing/Quotient.lean,Mathlib/RingTheory/Localization/Away/AdjoinRoot.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean,Mathlib/RingTheory/MvPowerSeries/Expand.lean,Mathlib/RingTheory/MvPowerSeries/LinearTopology.lean,Mathlib/RingTheory/NoetherNormalization.lean,Mathlib/RingTheory/Perfectoid/BDeRham.lean,Mathlib/RingTheory/Perfectoid/FontaineTheta.lean,Mathlib/RingTheory/Perfectoid/Untilt.lean,Mathlib/RingTheory/Polynomial/ShiftedLegendre.lean,Mathlib/RingTheory/PowerSeries/Expand.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/SimpleModule/InjectiveProjective.lean,Mathlib/RingTheory/SimpleRing/DivisionRing.lean,Mathlib/RingTheory/SimpleRing/Matrix.lean,Mathlib/RingTheory/Spectrum/Prime/IsOpenComapC.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeRightExact.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/RingTheory/Trace/Quotient.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/Identities.lean,Mathlib/RingTheory/WittVector/Isocrystal.lean,Mathlib/RingTheory/WittVector/MulP.lean,Mathlib/RingTheory/WittVector/Verschiebung.lean |
33 |
11 |
['github-actions', 'grunweg', 'harahu'] |
nobody |
53-49431 1 month ago |
53-51372 53 days ago |
55-67989 55 days |
0 |
| 40470 |
gasparattila author:gasparattila |
feat(Order/Partition/Finpartition): generalize `atomise` to `GeneralizedBooleanAlgebra` |
---
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|
t-order |
141/66 |
Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Order/Partition/Finpartition.lean |
2 |
4 |
['gasparattila', 'github-actions', 'mathlib-dependent-issues'] |
nobody |
53-39707 1 month ago |
65-19397 65 days ago |
65-28129 65 days |
0 |
| 41481 |
SnirBroshi author:SnirBroshi |
feat(SimpleGraph/Connectivity/Connected): a preconnected graph with finitely many edges has finitely many vertices |
`Finite V ↔ Finite G.Dart ↔ G.support.Finite ↔ G.edgeSet.Finite`
---
`#G.Dart = 2 * #G.edgeSet` is also true (#36406) which could simplify the `edgeSet` proof, but it's in `DegreeSum.lean` and more complicated. Having `Finite` theorems seems useful.
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|
t-combinatorics
large-import
|
79/1 |
Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Dart.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean |
4 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
53-26354 1 month ago |
74-30869 74 days ago |
86-74045 86 days |
0 |
| 43036 |
SnirBroshi author:SnirBroshi |
feat(Order/RelSeries): a strict order on a finite domain is finite dimensional |
Bound the length of a `RelSeries r` by the cardinality of `α` when `r` is a strict order (irreflexive and transitive), and show:
- `Finite α → r.IsIrrefl → r.IsTrans → Finite (RelSeries r)`
- `Infinite α → Infinite (RelSeries r)`
- `Finite α → Nonempty α → r.IsIrrefl → r.IsTrans → r.FiniteDimensional`
- `r.IsIrrefl → r.IsTrans → r.InfiniteDimensional → Infinite α`
---
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t-order |
62/13 |
Mathlib.lean,Mathlib/Order/RelSeries.lean,Mathlib/Order/RelSeries/Lemmas.lean |
3 |
1 |
['github-actions'] |
nobody |
53-13137 1 month ago |
55-82048 55 days ago |
55-83415 55 days |
0 |
| 43023 |
SnirBroshi author:SnirBroshi |
feat(Order/RelSeries): change `FiniteDimensional` to allow empty types |
This also means that the zero ring is now `FiniteRingKrullDim`, and that `Empty` is `FiniteDimensionalOrder`.
[#mathlib4 > Should zero ring be finite-dimensional?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Should.20zero.20ring.20be.20finite-dimensional.3F/with/495871110)
---
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|
t-order |
67/55 |
Mathlib/Order/KrullDimension.lean,Mathlib/Order/RelSeries.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/KrullDimension/Basic.lean |
5 |
3 |
['SnirBroshi', 'github-actions', 'themathqueen'] |
nobody |
52-31331 1 month ago |
56-37857 56 days ago |
56-37850 56 days |
0 |
| 43102 |
tb65536 author:tb65536 |
chore(GroupTheory/PGroup): to_additivize most of the file |
This PR to_additivizes most of `GroupTheory/PGroup.lean`.
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|
t-algebra
t-group-theory
label:t-algebra$ |
82/16 |
Mathlib/Algebra/Module/ZMod.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/Tactic/Translate/ToAdditive.lean |
3 |
6 |
['SnirBroshi', 'acmepjz', 'github-actions', 'tb65536'] |
nobody |
52-20875 1 month ago |
52-37937 52 days ago |
52-37932 52 days |
0 |
| 40620 |
SnirBroshi author:SnirBroshi |
feat(Order/SuccPred/CompleteLinearOrder): `sSup s = ⊤` iff theorems for `WithTop` |
For a `[ConditionallyCompleteLinearOrderBot α]` with `(s : Set (WithTop α))`:
- `sSup s = ⊤ ↔ ∀ a : α, ∃ b ∈ s, a < b`
- `[NoMaxOrder α] → sSup s = ⊤ ↔ ∀ a : α, ∃ b ∈ s, a ≤ b`
and the matching `iSup` theorems.
These can't be dualized because `ConditionallyCompleteLinearOrderBot` has no dual.
---
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[](https://gitpod.io/from-referrer/)
|
t-order |
26/0 |
Mathlib/Order/SuccPred/CompleteLinearOrder.lean,Mathlib/Order/WithBot.lean |
2 |
2 |
['github-actions', 'mathlib-dependent-issues'] |
nobody |
52-13477 1 month ago |
52-16392 52 days ago |
52-23683 52 days |
1 |
| 43123 |
harahu author:harahu |
chore(Testing): tidy markdown headers |
This PR ensures files in `Mathlib/Testing` have one and only one H1 header.
In the cases where the file did not already have an obvious H1 header candidate, a new header was authored by Claude Opus 5.
---
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[](https://gitpod.io/from-referrer/)
|
|
5/1 |
Mathlib/Testing/Plausible/Functions.lean,Mathlib/Testing/Plausible/Sampleable.lean,Mathlib/Testing/Plausible/Testable.lean |
3 |
1 |
['github-actions'] |
nobody |
51-63053 1 month ago |
51-63787 51 days ago |
51-63780 51 days |
0 |
| 43122 |
harahu author:harahu |
chore(Tactic): tidy markdown headers |
This PR ensures files in `Mathlib/Tactic` have one and only one H1 header.
In the cases where the file did not already have an obvious H1 header candidate, a new header was authored by Claude Opus 5.
---
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[](https://gitpod.io/from-referrer/)
|
|
60/37 |
Mathlib/Tactic/Algebraize.lean,Mathlib/Tactic/ApplyCongr.lean,Mathlib/Tactic/Bound.lean,Mathlib/Tactic/CategoryTheory/CheckCompositions.lean,Mathlib/Tactic/Conv.lean,Mathlib/Tactic/CrossRefAttribute.lean,Mathlib/Tactic/DSimpPercent.lean,Mathlib/Tactic/DeclarationNames.lean,Mathlib/Tactic/DepRewrite.lean,Mathlib/Tactic/FunProp/Attr.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Elab.lean,Mathlib/Tactic/FunProp/FunctionData.lean,Mathlib/Tactic/FunProp/Mor.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/ToBatteries.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Tactic/GuardGoalNums.lean,Mathlib/Tactic/GuardHypNums.lean,Mathlib/Tactic/Inhabit.lean,Mathlib/Tactic/Linarith.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnusedTacticExtension.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/NormNum/OfScientific.lean,Mathlib/Tactic/NormNum/Pow.lean,Mathlib/Tactic/NormNum/Result.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Ring/NamePolyVars.lean,Mathlib/Tactic/Ring/NamePowerVars.lean,Mathlib/Tactic/SplitIfs.lean,Mathlib/Tactic/Tauto.lean,Mathlib/Tactic/ToAdditive.lean,Mathlib/Tactic/ToDual.lean,Mathlib/Tactic/Widget/CommDiag.lean |
37 |
1 |
['github-actions'] |
nobody |
51-62534 1 month ago |
51-65812 51 days ago |
51-65805 51 days |
0 |
| 43082 |
WenrongZou author:WenrongZou |
feat(RingTheory/Henselian): add Hensel lemma for non-monic polynomials |
In a ring `R` that is Henselian at an ideal `I`, a simple root modulo `I` lifts to a root in `R` even when the polynomial is not monic.
And for local ring, we prove two more equivalent description of the theorem [`HenselianLocalRing.TFAE`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Henselian.html#HenselianLocalRing.TFAE).
---
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory |
111/20 |
Mathlib/Algebra/Polynomial/Reverse.lean,Mathlib/RingTheory/Henselian.lean |
2 |
2 |
['github-actions'] |
nobody |
49-68917 1 month ago |
53-66489 53 days ago |
53-66482 53 days |
0 |
| 42283 |
YaelDillies author:YaelDillies |
feat(RingTheory): diagonalisable Hopf algebras |
Define diagonalisable Hopf algebras as those that are isomorphic to some group algebra. We will prove in a later PR that they are closed under tensor product.
From Toric
---
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory
toric
|
168/1 |
Mathlib.lean,Mathlib/LinearAlgebra/Finsupp/LinearCombination.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/RingTheory/HopfAlgebra/Basic.lean,Mathlib/RingTheory/HopfAlgebra/Diagonalisable.lean |
5 |
1 |
['github-actions'] |
nobody |
49-44434 1 month ago |
77-69819 77 days ago |
77-69864 77 days |
1 |
| 42377 |
norbsvr author:norbsvr |
doc(1000.yaml): add Brauer's theorem on induced characters |
Claims a proof of [Q4958218:](https://www.wikidata.org/wiki/Q4958218) Brauer's theorem on induced characters.
The formalization is in an <a href="https://github.com/norbsvr/BrauerInduction/">external Lean 4 repository</a>. Please see file `README.md` for further information.
---
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[](https://gitpod.io/from-referrer/)
|
new-contributor |
3/0 |
docs/1000.yaml |
1 |
3 |
['github-actions'] |
nobody |
48-19146 1 month ago |
75-25964 75 days ago |
75-25957 75 days |
0 |
| 43258 |
ScottCarnahan author:ScottCarnahan |
feat(Algebra/MonoidAlgebra/PointwiseSMul): add smulAntidiagonal and API |
Given actions of `R` on `V` and `G` on `P`, the `smulAntidiagonal` of `f : MonoidAlgebra R G` and `x : P → V` at `p : P` is the finset in `G × P` whose elements scalar-multiply to `p` and whose components lie in the support of `f` and `x`. This PR defines the `smulAntidiagonal` and shows that convolutional scalar multiplication coincides with monoid algebra multiplication when `V = R` and `P = G`.
---
[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
49/0 |
Mathlib/Algebra/MonoidAlgebra/PointwiseSMul.lean |
1 |
1 |
['github-actions'] |
nobody |
46-13224 1 month ago |
46-48019 46 days ago |
46-48012 46 days |
0 |
| 42590 |
AntoineduFresne author:AntoineduFresne |
feat(Order/UpperLower/Closure): the upper and lower closures of a maximal antichain cover the order |
I add `IsMaxAntichain.upperClosure_union_lowerClosure`. It says that the upper and lower closures of a maximal antichain cover the whole order.
I put it right after `ordConnected_iff_upperClosure_inter_lowerClosure`, next to `upperClosure_inter_lowerClosure`, which seems the right spot.
The lemma is about antichains, so `Mathlib/Order/Antichain.lean` would have looked like the natural file to modify, but `upperClosure` is defined in `Mathlib/Order/UpperLower/Closure.lean`, which imports `Mathlib.Order.Interval.Set.OrdConnected`, which imports `Mathlib.Order.Antichain`. So to avoid an import loop I put it in `Closure.lean`.
I split this out of #40741, where a reviewer suggested it. Nothing in that PR uses the lemma.
|
t-order
new-contributor
|
13/0 |
Mathlib/Order/Antichain.lean,Mathlib/Order/UpperLower/Closure.lean |
2 |
12 |
['AntoineduFresne', 'Ruben-VandeVelde', 'SnirBroshi', 'github-actions', 'tdwag123'] |
nobody |
45-64968 1 month ago |
46-17028 46 days ago |
61-60456 61 days |
0 |
| 43128 |
dannyhe652 author:dannyhe652 |
feat(SimpleGraph/Coloring): add edge colorings and missing colors |
## Summary
This PR starts the edge-coloring API needed for Vizing's theorem.
It defines edge colorings as vertex colorings of the line graph, introduces edge
colorability and the chromatic index, and adds the basic local color-set API around a
vertex.
Main additions:
- `vizing.edgeColoring`
- `vizing.edgeColorable`
- `vizing.chromaticIndex`
- `vizing.incidentEdges`
- `vizing.incidentColors`
- `vizing.missingColors`
It also proves the basic cardinality estimates relating incident colors to vertex degree,
including that with more available colors than the degree, some color is missing at the
vertex.
This is the first PR in a stacked development toward Vizing's theorem.
## Co-authors
Co-authored-by: Daniel Raggi <dr495@cam.ac.uk>
Co-authored-by: Aristotle (Harmonic) <aristotle-harmonic@harmonic.fun>
Co-authored-by: Claude Opus 4.5 & 4.6 <noreply@anthropic.com>
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics
new-contributor
LLM-generated
|
271/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/EdgeColoring.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/KempeChain.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/KempeChain/Basic.lean |
4 |
6 |
['SnirBroshi', 'dannyhe652', 'github-actions'] |
nobody |
45-48063 1 month ago |
51-58565 51 days ago |
51-58654 51 days |
4 |
| 42468 |
Cobord author:Cobord |
feat: added lambda rings |
Description:
This does lambda rings. It is mostly over rationals so we can concern ourselves only with the psi^n operations and not the more complicated lambda^n operations. Doing the more general case could be another PR. This also includes the Getzler type formulation as the map involving Lambda_R the ring of symmetric functions in countably many variables (which again because R is assumed as [Algebra Q R] is described with it's power sum generators). That is to say the Plethystic action. Homomorphisms of such lambda rings are also covered. In particular, those of inclusions of subrings closed under those psi^n operations. In addition, one of the primary motivating examples of K(GL(n)/P) otimes_Z Q is described as such an instance to provide an example that is not Lambda_R.
This was done with Claude Code for generating initial versions but I had not given a good full prompt about prefering psi^n over lambda^n or using a structure instead of a prop in AdamsHom so I ended up rewriting most of those parts by hand anyway. The exception is the PrimeExtend file which is about only giving the psi^p instead of all of the psi^n, but abstracted away from those particular details per clarifying instructions after an initial version.
Because PrimeExtend is so much, this has a tag of
LLM-generated
In addition even though it is in RingTheory it is highly relevant to
t-combinatorics
in the sense of algebraic combinatorics due to use of ring of symmetric functions in countably many variables. |
t-ring-theory
new-contributor
t-combinatorics
LLM-generated
|
898/0 |
Mathlib.lean,Mathlib/RingTheory/LambdaRing/AdamsHom.lean,Mathlib/RingTheory/LambdaRing/AdamsOperations.lean,Mathlib/RingTheory/LambdaRing/KFlagExample.lean,Mathlib/RingTheory/LambdaRing/PrimeExtend.lean,Mathlib/RingTheory/LambdaRing/SymmetricFunctions.lean |
6 |
4 |
['Cobord', 'github-actions'] |
nobody |
45-10260 1 month ago |
67-35851 67 days ago |
67-36615 67 days |
0 |
| 43374 |
plp127 author:plp127 |
chore: remove `WittVector.mk'` |
Override the structure constructor transparencies so that duplicating a `WittVector.mk'` is no longer necessary.
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|
t-ring-theory |
28/19 |
Mathlib/RingTheory/WittVector/Defs.lean,Mathlib/RingTheory/WittVector/DiscreteValuationRing.lean,Mathlib/RingTheory/WittVector/Domain.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/FrobeniusFractionField.lean,Mathlib/RingTheory/WittVector/InitTail.lean,Mathlib/RingTheory/WittVector/IsPoly.lean,Mathlib/RingTheory/WittVector/Teichmuller.lean,Mathlib/RingTheory/WittVector/Truncated.lean,Mathlib/RingTheory/WittVector/Verschiebung.lean |
10 |
1 |
['github-actions'] |
nobody |
43-53790 1 month ago |
43-54790 43 days ago |
43-54878 43 days |
0 |
| 43394 |
harahu author:harahu |
feat(Order/WithBot): add `WithBot.map_lt_map_iff` |
Add `WithBot.map_lt_map_iff`, the `<` analogue of `WithBot.map_le_iff`, for use in a follow-up.
Its natural home is the `LT` section. For symmetry, we also generalize `WithBot.map_le_iff`.
Also rename `map_le_iff` to `map_le_map_iff`, since the operation appears on both sides of the relation. The bare `X_le_iff` form is used throughout Mathlib for the one-sided shape `f a ≤ b ↔ ...`.
---
Developed with help from of Claude Opus 5.
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|
t-order
LLM-generated
|
12/5 |
Mathlib/Order/Hom/WithTopBot.lean,Mathlib/Order/WithBot.lean |
2 |
1 |
['github-actions'] |
nobody |
43-46610 1 month ago |
43-49272 43 days ago |
43-49265 43 days |
0 |
| 43095 |
plp127 author:plp127 |
chore(Data/PFunctor): reduce defeq abuse around `PFunctor.W` |
Reduce the defeq abuse around `PFunctor.W` by adding some API.
---
- [x] depends on: #43056
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|
t-data
tech debt
|
88/52 |
Mathlib/Data/PFunctor/Multivariate/W.lean,Mathlib/Data/PFunctor/Univariate/Basic.lean,Mathlib/Data/QPF/Univariate/Basic.lean |
3 |
2 |
['github-actions', 'mathlib-dependent-issues'] |
nobody |
43-26277 1 month ago |
43-37107 43 days ago |
43-37937 43 days |
0 |
| 43087 |
JX-Mo author:JX-Mo |
feat(RepresentationTheory): add Hecke/Basic.lean |
This file defines `HeckeModule` of a representation `ρ` as `Hom_G(k[G ⧸ H], ρ)` and identifies it
with the space of `H`-invariants. |
new-contributor
t-algebra
label:t-algebra$ |
87/0 |
Mathlib.lean,Mathlib/RepresentationTheory/Hecke/Basic.lean |
2 |
8 |
['JX-Mo', 'Whysoserioushah', 'github-actions'] |
nobody |
42-68115 1 month ago |
53-45058 53 days ago |
53-45153 53 days |
0 |
| 43407 |
thomaskwaring author:thomaskwaring |
feat(Order/Hom/CompleteLattice): order adjoints for `{sSup/sInf}Hom` |
This PR defines the order adjoint of a `sSup` or `sInf` preserving function, which defines an equivalence `sSupHom α β ≃ sInfHom β α`, and an order isomorphism `sSupHom α β ≃o (sInfHom β α)ᵒᵈ` (plus duals).
---
I'm not 100% certain on the naming here, and would very much appreciate any advice & help with `to_dual` — an alternative option is `upperAdj` and `lowerAdj`, which `to_dual`-ises automatically.
[](https://gitpod.io/from-referrer/)
|
t-order |
69/0 |
Mathlib/Order/Hom/CompleteLattice.lean |
1 |
4 |
['SnirBroshi', 'github-actions', 'thomaskwaring'] |
nobody |
42-55064 1 month ago |
43-38438 43 days ago |
43-38431 43 days |
0 |
| 42716 |
Raph-DG author:Raph-DG |
feat(CategoryTheory): module structure on ext groups |
In this PR, we construct an R module structure on Ext A G n given a ring homomorphism (φ : R →+* End G). We also show that this module structure agrees with the existing module structure on Ext A G n in the case where the ambient category is R linear.
The main motivation for doing this is that until we have some nice comparison lemmas going between cohomology taken in the category of sheaves of modules and cohomology taken in the category of sheaf of abelian groups, I think it will be more useful to work with the cohomology of the underlying sheaf of abelian groups of a sheaf of modules. However, the category of sheaves of abelian groups is not R linear for most R, so we do not immediately inherit R-module structure on the cohomology groups from this machinery.
AI disclosure: I had AI perform some cleanups and edits to some code originally written by me, as well as having it move things into the correct files. I also had it create this branch from another branch which I decided had too much content for a single PR.
---
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|
t-algebra label:t-algebra$ |
31/0 |
Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean |
1 |
3 |
['github-actions', 'mathlib-bors'] |
nobody |
42-47799 1 month ago |
49-49852 49 days ago |
64-51589 64 days |
1 |
| 43446 |
gasparattila author:gasparattila |
feat: `direction` of `AffineSubspace.comap` |
---
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|
t-algebra label:t-algebra$ |
19/0 |
Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Basic.lean |
1 |
2 |
['github-actions', 'wwylele'] |
nobody |
41-61641 1 month ago |
42-26170 42 days ago |
42-26163 42 days |
1 |
| 43461 |
mcdoll author:mcdoll |
feat(Analysis/SchwartzMap): missing lemmas about inverse Fourier transform |
Adds lemmas that are already present for the Fourier transform, plus a pair of lemmas for the relation to the `L1` Fourier transform.
---
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|
t-analysis |
54/0 |
Mathlib/Analysis/Distribution/SchwartzSpace/Fourier.lean |
1 |
1 |
['github-actions'] |
nobody |
41-52803 1 month ago |
41-54172 41 days ago |
41-54165 41 days |
1 |
| 43464 |
gasparattila author:gasparattila |
fix(LinearAlgebra/Projectivization/Subspace): fix non-defeq `Min` instances |
The `CompleteLattice` instance of `Projectivization.Subspace` is currently defined using `completeLatticeOfInf`, which conflicts with the `Min` instance defined earlier. This PR fixes this by overriding the `inf` field. To avoid possible issues with `⊥` and `⊤`, they are also redefined to have good defeqs.
---
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|
t-algebra label:t-algebra$ |
17/20 |
Mathlib/LinearAlgebra/Projectivization/Subspace.lean |
1 |
1 |
['github-actions'] |
nobody |
41-49042 1 month ago |
41-49820 41 days ago |
41-49813 41 days |
0 |
| 41633 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/Paths): length of closed a walk/trail isn't `1`/`2` |
For a closed walk `p`:
- `p.length ≠ 1`
- `p.IsTrail` → `p.length ≠ 2`
- `p.IsTrail` → `p.length ≤ 2` → `p.Nil`
---
Since a circuit is a closed non-nil trail, `IsTrail.nil_of_length_le_two` is basically the contrapositive of `IsCircuit.three_le_length`, but I think this form is useful.
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|
t-combinatorics |
11/4 |
Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean |
2 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
41-43335 1 month ago |
41-44107 41 days ago |
92-63206 92 days |
0 |
| 43478 |
plp127 author:plp127 |
feat(Data/PFunctor): pointfree lemmas for map |
Prove `PFunctor.map_id` and `PFunctor.map_comp_map`, pointfree analogues of `PFunctor.id_map` and `PFunctor.map_map`. The names are chosen to match the corresponding lemmas for `LawfulFunctor`.
---
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|
t-data |
5/0 |
Mathlib/Data/PFunctor/Univariate/Basic.lean |
1 |
1 |
['github-actions'] |
nobody |
40-82403 1 month ago |
40-83148 40 days ago |
40-83283 40 days |
0 |
| 42370 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/Maps): more `map`/`comap` API |
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics |
114/9 |
Mathlib/Combinatorics/SimpleGraph/Maps.lean |
1 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
40-19445 1 month ago |
40-20247 40 days ago |
74-65437 74 days |
1 |
| 43507 |
SnirBroshi author:SnirBroshi |
fix(Combinatorics/SimpleGraph): namespace `completeBipartiteGraph` under `SimpleGraph` |
and fix the names of `CompleteBipartiteGraph.bicoloring` and `CompleteBipartiteGraph.chromaticNumber`.
---
Moved the `namespace SimpleGraph` in `Basic.lean` to right after the definition of `SimpleGraph`, to avoid putting things outside of the namespace.
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics |
29/20 |
Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Vertex.lean |
2 |
1 |
['github-actions'] |
nobody |
39-73649 1 month ago |
40-2149 40 days ago |
40-2142 40 days |
0 |
| 43519 |
harahu author:harahu |
chore(Order/Interval/Set/SuccPred): generalize lemmas |
We generalize five lemmas from `LinearOrder` to `Preorder` and three to `PartialOrder`.
The motivation for the `Preorder` generalizations is to enable deprecation of the almost identical results in `Mathlib/Order/SuccPred/Basic.lean`. The results in that file are stated more generally, so we need to generalize in order to subsume them properly.
---
We're aiming to keep the statements in the touched file rather than those in `SuccPred/Basic.lean` based on [this discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/duplicate.20succ.20interval.20lemmas/with/621955635).
This PR has significant overlap with #23810, but does not cover `Finset/SuccPred.lean`. The touched file in this PR asks to be kept in sync with the `Finset` sibling, but there is already a lot of divergence since the `Finset` file hasn't been treated with `to_dual` yet. I therefore suggest that `Finset/SuccPred.lean` and the other sibling files be brought up to date in a subsequent PR.
The generalizations were performed by Claude Code, and thereafter reviewed and somewhat cleaned up by me.
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|
t-order |
61/19 |
Mathlib/Order/Interval/Set/SuccPred.lean |
1 |
3 |
['github-actions', 'harahu', 'vihdzp'] |
vihdzp assignee:vihdzp |
39-53765 1 month ago |
39-60807 39 days ago |
39-60800 39 days |
0 |
| 43526 |
vihdzp author:vihdzp |
chore(Topology/CantorBendixson): cleanup + more basic API |
We perform various small golfs, make some variables explicit, and add a few trivial lemmas.
---
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I would've suggested all of this in #37375, but somehow that PR went under my radar.
[](https://gitpod.io/from-referrer/)
|
t-topology |
58/57 |
Mathlib/SetTheory/Ordinal/FixedPointApproximants.lean,Mathlib/Topology/CantorBendixson.lean,Mathlib/Topology/DerivedSet.lean |
3 |
1 |
['github-actions'] |
nobody |
39-53595 1 month ago |
39-57572 39 days ago |
39-57565 39 days |
0 |
| 43360 |
metakunt author:metakunt |
feat(RingTheory/AdjoinRoot/MapCyclotomic): define algebra isomorphism isAdjoinRoot for roots of unity |
From #43343
Section is deliberately not exposed. I think the API developed should be enough. But if needed it can always be exposed later. |
t-ring-theory
LLM-generated
|
111/7 |
Mathlib.lean,Mathlib/RingTheory/AdjoinRoot/MapCyclotomic.lean,Mathlib/RingTheory/IsAdjoinRoot.lean |
3 |
19 |
['github-actions', 'mathlib-bors', 'metakunt', 'tb65536'] |
nobody |
39-33859 1 month ago |
39-35846 39 days ago |
41-28415 41 days |
0 |
| 43549 |
JovanGerb author:JovanGerb |
chore(Algebra/Homology/HasNoLoop): use `to_dual` |
---
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|
t-algebra label:t-algebra$ |
4/16 |
Mathlib/Algebra/Homology/HasNoLoop.lean |
1 |
1 |
['github-actions'] |
nobody |
39-31015 1 month ago |
39-31861 39 days ago |
39-31854 39 days |
0 |
| 43309 |
YaelDillies author:YaelDillies |
refactor(Geometry/Convex): make `StdSimplex` extend `Finsupp` |
Among other things, this lets users write `w.support` for `w : StdSimplex _ _` instead of `w.weights.support`. It prints the same, however.
From the Polytopes in Berlin workshop, where participants requested that they could write `w.support` instead of `w.weights.support`.
---
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[](https://gitpod.io/from-referrer/)
|
t-convex-geometry |
6/4 |
Mathlib/Geometry/Convex/ConvexSpace/Barycenter.lean,Mathlib/Geometry/Convex/ConvexSpace/Defs.lean |
2 |
4 |
['YaelDillies', 'b-mehta', 'github-actions'] |
nobody |
38-17376 1 month ago |
43-37497 43 days ago |
43-38304 43 days |
0 |
| 43401 |
thomaskwaring author:thomaskwaring |
feat(Order): counterparts of `iSupIndep.disjoint_biSup_biSup{'}` for `sSup` |
Transfer `iSupIndep.disjoint_biSup_biSup'` and `iSupIndep.disjoint_biSup_biSup` to `sSupIndep.disjoint_sSup_sSup'` and `sSupIndep.disjoint_sSup_sSup`. Also add the supporting rewrite lemma `biSup_preimage`, roughly dual to `sSup_image`.
---
Used downstream for working with `Partition`, whose fields are stated in terms of `sSupIndep`.
[](https://gitpod.io/from-referrer/)
|
t-order |
22/0 |
Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/SupIndep.lean |
3 |
5 |
['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
37-68272 1 month ago |
37-71383 37 days ago |
42-76696 42 days |
0 |
| 43608 |
SnirBroshi author:SnirBroshi |
chore(Order/RelClasses): remove redundant instances |
Some instances can be synthesized but are necessary to help `to_dual`, so they are kept.
---
Also remove instance names using `to_dual none`.
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|
t-order |
31/70 |
Mathlib/Order/Quotient.lean,Mathlib/Order/RelClasses.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/SetTheory/ZFC/Basic.lean |
4 |
3 |
['SnirBroshi', 'github-actions', 'leanprover-radar'] |
nobody |
37-48462 1 month ago |
37-56376 37 days ago |
37-58852 37 days |
0 |
| 43626 |
mathlib-splicebot author:mathlib-splicebot |
chore(Algebra/GroupWithZero/Basic): automated extraction from #43343 |
This PR was automatically created from PR #43343 by @metakunt via a [review comment](https://github.com/leanprover-community/mathlib4/pull/43343#discussion_r3969323130) by @metakunt. |
t-algebra label:t-algebra$ |
21/1 |
Mathlib/Algebra/GroupWithZero/Basic.lean |
1 |
1 |
['github-actions'] |
nobody |
37-41753 1 month ago |
37-44512 37 days ago |
37-44505 37 days |
1 |
| 43637 |
gasparattila author:gasparattila |
feat(Topology/Sets): `ClosedIciTopology` and `OrderClosedTopology` instances for `Compacts` |
---
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|
t-topology |
41/0 |
Mathlib/Topology/Sets/VietorisTopology.lean |
1 |
1 |
['github-actions'] |
nobody |
37-34431 1 month ago |
37-35791 37 days ago |
37-35784 37 days |
0 |
| 42724 |
kim-em author:kim-em |
feat(RingTheory/Polynomial/Hermite): derivatives and the generating function |
This PR adds the classical derivative identities, three-term recurrence, parity, and exponential generating function for the probabilists' Hermite polynomials. The algebraic results include `derivative_hermite`, `iterate_derivative_hermite`, `hermite_add_two`, and polynomial and evaluated forms of parity; the analytic results prove `∑' n, Hₙ(x) * tⁿ / n! = exp (x * t - t² / 2)` in complex and real `HasSum` forms, with a real `tsum` corollary. The algebraic and analytic developments live in separate files.
This contribution originated in the [Tau Ceti project](https://github.com/TauCetiProject/TauCeti), an AI-written mathematics repository; it was adapted for Mathlib with Claude Code and reviewed with OpenAI Codex, supervised by Kim Morrison.
:robot: Prepared with OpenAI Codex
|
t-ring-theory
LLM-generated
TauCeti
|
259/0 |
Mathlib.lean,Mathlib/RingTheory/Polynomial/Hermite/Derivative.lean,Mathlib/RingTheory/Polynomial/Hermite/GeneratingFunction.lean |
3 |
3 |
['b-mehta', 'github-actions', 'kim-em'] |
nobody |
36-77577 1 month ago |
43-84415 43 days ago |
43-84408 43 days |
0 |
| 43327 |
JX-Mo author:JX-Mo |
feat(GroupTheory): add `LeftDecomposition` of double coset |
This PR is the first piece of #43286 for adding `Hecke/LeftFiniteDoubleCoset`. The main motivation is to describe the intertwining space `Hom_G(k[G/H₁], k[G/H₂])` as the free module double cosets with finite left-coset decomposition. In this PR we introduce only the left decomposition.
We deliberately design two indexing types for the left-coset decomposition: the intrinsic LeftDecomposition and the computational LeftDecompQuotient. They are equivalent via toLeftDecompositionEquiv. The first is useful for coordinate-free definitions and proofs, which saves us from abusing Quotient.out everywhere (note that we have three quotients in Hecke theory: `G/H₂, H₁/H₁∩gH₂g⁻¹, H₁\G/H₂`) and avoids "choosing representative from decomposition in the def => proving the def does not depend the choice + repeating this kind of argument for comparing different representatives in many downstream proofs" pattern. The second LeftDecompQuotient carries a fixed base point `gH₂` and remains useful for concrete convolution product computation. |
t-algebra label:t-algebra$ |
119/0 |
Mathlib.lean,Mathlib/RepresentationTheory/Hecke/LeftFiniteDoubleCoset.lean |
2 |
1 |
['github-actions'] |
nobody |
36-70877 1 month ago |
36-71586 36 days ago |
44-85957 44 days |
4 |
| 43305 |
WenrongZou author:WenrongZou |
feat(PowerSeries/Derivative): add some lemmas |
In this PR, I migrated some results from Polynomial/Derivative.lean to PowerSeries/Derivative.lean.
---
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory |
59/0 |
Mathlib/RingTheory/PowerSeries/Derivative.lean |
1 |
2 |
['WenrongZou', 'github-actions'] |
nobody |
36-69317 1 month ago |
36-70002 36 days ago |
45-40116 45 days |
0 |
| 43166 |
WenrongZou author:WenrongZou |
feat(MvPowerSeries/pderiv): add `pderiv_map` and `pderiv_rename` |
In this PR, we prove `MvPowerSeries.map` and `MvPowerSeries.rename` commute with taking derivative.
---
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[](https://gitpod.io/from-referrer/)
|
large-import
t-ring-theory
|
29/2 |
Mathlib/RingTheory/MvPowerSeries/Derivative.lean |
1 |
1 |
['github-actions'] |
nobody |
36-68198 1 month ago |
39-4978 39 days ago |
50-60143 50 days |
1 |
| 43672 |
javgomzar author:javgomzar |
chore(LinearAlgebra/Matrix): add push tags to transpose lemmas |
---
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[](https://gitpod.io/from-referrer/)
|
t-algebra
new-contributor
label:t-algebra$ |
6/5 |
Mathlib/LinearAlgebra/Matrix/Defs.lean |
1 |
3 |
['github-actions'] |
nobody |
36-43123 1 month ago |
36-45657 36 days ago |
36-45650 36 days |
0 |
| 42424 |
lydia-schiff author:lydia-schiff |
feat(Order/Partition/Finpartition): transport a set partition along a type equivalence |
- Adds `Finpartition.congr` to transport a `Finpartition` along a type equivalence.
- We can use `Finpartition.map` if we have an order-iso, and the equivalence induces one via the new `Finset.congrOrderIso` which is based on `Equiv.finsetCongr`.
- Includes parts, card, refl, and round-trip lemmas.
---
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- `Equiv.finsetCongr` already gives us an equivalence of Finsets, so the new `Finset.congrOrderIso` just adds that the power-set lattice structure is also preserved.
- Includes lemmas showing that the parts are e-images of the old ones, card is preserved, and refl + round-trip for the equivalence.
- The cardinality lemma was the original motivation from some work on Stirling numbers, but I thought that `Finpartition.congr` and `Finset.congrOrderIso` seemed reusable and hopefully useful in their own right, and thought it would make a good first contribution.
- Zulip thread about naming and placement [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60Finpartition.2Econgr.60.20.E2.80.94.20naming.20.26.20placement)
- I used Claude Opus 4.8 to help draft the proofs and explore the API. I have spent several weeks making sure I understand and can justify every line and I've learned a lot which is great.
[](https://gitpod.io/from-referrer/)
|
t-order
LLM-generated
new-contributor
|
61/0 |
Mathlib/Data/Finset/Image.lean,Mathlib/Order/Partition/Finpartition.lean |
2 |
6 |
['github-actions', 'lydia-schiff', 'mathlib-merge-conflicts'] |
nobody |
36-26280 1 month ago |
36-30737 36 days ago |
63-15292 63 days |
0 |
| 41523 |
Harmenszoon author:Harmenszoon |
feat(Analysis/SpecialFunctions): add the Chase-Lovett diagonal reduction for binEntropy |
This PR adds the two-variable entropy inequality of Chase and Lovett ([arXiv:2211.11689](https://arxiv.org/abs/2211.11689), Lemma 2.2): for `x, y ∈ [0, 1]`,
```
x * binEntropy y + y * binEntropy x ≤ 2 * sqrt (x * y) * binEntropy (sqrt (x * y))
```
in a new leaf file `Mathlib/Analysis/SpecialFunctions/BinaryEntropy/Diagonal.lean`, together with its `negMulLog (1 - ·)` half (`Real.mul_negMulLog_one_sub_add_le`) and a `private` concavity layer for the comparison function `η u = exp u * negMulLog (1 - exp (-u))`. Two entries are added to `docs/references.bib` (Chase–Lovett arXiv:2211.11689, Boppana arXiv:2301.09664).
**Motivation.** This inequality is the reusable reduction step behind the recent entropic lower bounds for Frankl's union-closed sets conjecture (Gilmer; Alweiss–Huang–Sellke; Chase–Lovett; Sawin; Boppana): it reduces two-variable inequalities of Boppana type `K * (x * h y + y * h x) ≤ h (x * y)` to one-variable inequalities `2 * K * t * h t ≤ h (t ^ 2)`. `Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean` currently contains calculus basics for `binEntropy` only, and no inequality of this family; I checked current master for collisions before opening this. A kernel-checked downstream application — a complete Lean formalization of the union-closed lower bound at the constant `(3 - √5)/2` that uses exactly this reduction — is public at https://github.com/demonstrandum-research/artifacts (the `UCFrankl` development), which I maintain.
**Proof shape** (one page of calculus): substituting `x = exp (-u)`, the inequality becomes midpoint concavity of `η` on `[0, ∞)`; the `negMulLog (x * y)` parts of the two sides cancel exactly, the `negMulLog (1 - ·)` parts transfer to `η` via the identity `x * η (-log x) = negMulLog (1 - x)`, and `η'' ≤ 0` reduces to `log t ≤ t - 1`. Stating `η` through `negMulLog` absorbs the `0 * log 0` boundary behaviour, so no separate edge-case argument is needed at `x = 1`.
**Design notes / open questions for reviewers.**
- Hypotheses are stated as `0 ≤ x`/`x ≤ 1` pairs rather than `x ∈ Set.Icc 0 1`; happy to convert if the membership form is preferred.
- The `η`-machinery is `private`; it could be exposed if judged independently useful.
- File placement: a new `BinaryEntropy/Diagonal.lean` leaf keeps the import footprint of `BinaryEntropy.lean` unchanged (the proof needs `Analysis.Convex.Deriv`); merging into the main file is also possible if preferred.
- Naming: `mul_binEntropy_add_mul_binEntropy_le` / `mul_negMulLog_one_sub_add_le` follow the conclusion-based convention but I am glad to rename.
**AI disclosure** (per the [mathlib AI policy](https://leanprover-community.github.io/contribute/index.html)): the Lean code in this PR was generated by LLM agents (Anthropic's Claude, running in an agent pipeline that I operate under the name Demonstrandum), and was then compile-verified against mathlib and reviewed by me. This PR description was also prepared with AI assistance and reviewed by me. The proof is elementary calculus as summarized above; I understand it and take full responsibility for the contribution. I am adding the `LLM-generated` label as required. The downstream `UCFrankl` development linked above (kernel-checked, axioms `[propext, Classical.choice, Quot.sound]` only) is the evidence that the lemma carries real weight in applications.
---
- [x] depends on: nothing
|
t-analysis
LLM-generated
new-contributor
|
227/0 |
Mathlib.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy/Diagonal.lean,docs/references.bib |
3 |
5 |
['Harmenszoon', 'Timeroot', 'github-actions'] |
nobody |
36-5199 1 month ago |
99-80403 99 days ago |
99-80396 99 days |
0 |
| 43621 |
Whning0513 author:Whning0513 |
feat(Data/List): add basic API for toChunks |
Adds basic API lemmas for `List.toChunks`: flattening recovers the input, chunks are nonempty sublists, and their lengths are bounded by the chunk size.
This addresses the `Data/List/Basic: SP: toChunks` item in #7987.
Tests:
- `lake env lean Mathlib/Data/List/ToChunks.lean`
- `lake build Mathlib.Data.List.ToChunks`
- `lake exe runLinter Mathlib.Data.List.ToChunks`
AI use: OpenAI Codex was used to rebase the branch, run the checks above, and submit this pull request. The code and proofs were written and reviewed by the author. |
t-data
new-contributor
|
119/0 |
Mathlib.lean,Mathlib/Data/List/ToChunks.lean |
2 |
8 |
['copilot-pull-request-reviewer', 'github-actions', 'theebayuser'] |
nobody |
35-77319 1 month ago |
37-47149 37 days ago |
37-47142 37 days |
0 |
| 40050 |
ReemMelamed author:ReemMelamed |
feat(Algebra/Group/GreensRelations): add definitions for Green's relations |
This PR introduces the foundational definitions for Green's relations (L, R, H, D, and J) on semigroups.
This is the first in a series of PRs aimed at formalizing Green's relations for semigroups.
[Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Formalization.20of.20Green.27s.20Relations.20for.20semigroups/with/598557876)
---
- [x] depends on: #40843
|
t-algebra
new-contributor
label:t-algebra$ |
505/0 |
Mathlib.lean,Mathlib/Algebra/Group/GreensRelations/Basic.lean |
2 |
33 |
['ReemMelamed', 'YaelDillies', 'YanYablonovskiy', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues'] |
nobody |
35-55680 1 month ago |
35-56446 35 days ago |
55-47589 55 days |
1 |
| 43680 |
Jun2M author:Jun2M |
feat(Topology): add path interiors and connectivity lemmas |
This PR is part of PR chain leading to definition of drawing of graph on topological space. This PR introduces preliminary unit interval/path results needed for the later PRs.
In particular, this PR
* Defines `Path.interior` as the image of the open parameter interval.
* Proves that path ranges and nonempty open subintervals of the unit interval are path-connected
* Adds endpoint lemmas for analyzing path interiors.
Some of the lemmas in the PR chain was initially proven with codex then manually golfed.
---
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[](https://gitpod.io/from-referrer/)
|
t-topology |
39/0 |
Mathlib/Analysis/Convex/PathConnected.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/UnitInterval.lean |
4 |
3 |
['github-actions', 'mathlib-bors', 'vlad902'] |
nobody |
35-42939 1 month ago |
35-44821 35 days ago |
36-36621 36 days |
2 |
| 43702 |
theebayuser author:theebayuser |
feat(LinearAlgebra/AffineSpace): add Varignon's theorem |
Hello, this PR introduces Varignon's theorem.
Varignon's theorem states that the midpoints of the sides of a quadrilateral form a parallelogram. More precisely, `midpoint_midpoint_midpoint_rotate` states: the two diagonals of the midpoint quadrilateral have the same midpoint.
This PR was written with AI assistance (Claude Code)
|
t-algebra
new-contributor
LLM-generated
label:t-algebra$ |
22/2 |
Mathlib/LinearAlgebra/AffineSpace/Midpoint.lean,docs/1000.yaml |
2 |
7 |
['github-actions', 'theebayuser', 'wwylele'] |
nobody |
35-36697 1 month ago |
35-82769 35 days ago |
35-82762 35 days |
0 |
| 42313 |
deancureton author:deancureton |
feat(RingTheory): embDomain composition and range, Laurent series expansion |
Add to the Hahn series API:
- `embDomain_embDomain` (composition of domain embeddings)
- `mem_range_embDomain_iff` (range of `embDomain` is characterized by support containment)
Add to the Laurent series API:
- the expansion ring endomorphism `LaurentSeries.expand` with its monomial and `orderTop` lemmas
- follows the pattern of `Polynomial.expand`, `MvPolynomial.expand`, `PowerSeries.expand`
- its opposite `LaurentSeries.contract`, with the decomposition of a Laurent series by exponent residues mod `n` (`sum_single_mul_expand_contract`) and its uniqueness (`contract_eq_of_sum_eq`)
- `exists_ofPowerSeries_eq_of_orderTop_nonneg`
This is the first of a series of PRs formalizing Puiseux series and Puiseux's theorem (entry 41 of Freek Wiedijk's 100 theorems list). |
t-ring-theory
new-contributor
LLM-generated
|
116/0 |
Mathlib/RingTheory/HahnSeries/Basic.lean,Mathlib/RingTheory/LaurentSeries.lean |
2 |
16 |
['deancureton', 'github-actions', 'wwylele'] |
nobody |
35-30054 1 month ago |
65-9299 65 days ago |
77-13027 77 days |
0 |
| 41241 |
intgrah author:intgrah |
feat(Order/Category): cartesian closed and distributive structure on PartOrd and Preord |
Give `PartOrd` and `Preord` `CartesianMonoidalCategory`, `MonoidalClosed`, and `IsCartesianDistributive` instances.
---
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[](https://gitpod.io/from-referrer/)
|
new-contributor
t-order
|
267/0 |
Mathlib.lean,Mathlib/Order/Category/PartOrd/CartesianClosed.lean,Mathlib/Order/Category/PartOrd/Colimits.lean,Mathlib/Order/Category/PartOrd/Reflective.lean,Mathlib/Order/Category/Preord/CartesianClosed.lean,Mathlib/Order/Category/Preord/Colimits.lean,Mathlib/Order/Category/Preord/Reflective.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean |
8 |
7 |
['github-actions', 'intgrah', 'thomaskwaring'] |
nobody |
35-28996 1 month ago |
37-10877 37 days ago |
107-47098 107 days |
0 |
| 43766 |
hawkrobe author:hawkrobe |
feat(LinearAlgebra/SymmetricAlgebra): functoriality |
---
Add `SymmetricAlgebra` functoriality (parallel to `TensorAlgebra` and `ExteriorAlgebra`)
[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
31/0 |
Mathlib/LinearAlgebra/SymmetricAlgebra/Basic.lean |
1 |
1 |
['github-actions'] |
nobody |
33-64537 1 month ago |
33-66054 33 days ago |
33-66047 33 days |
0 |
| 43767 |
hawkrobe author:hawkrobe |
feat(LinearAlgebra/SymmetricAlgebra): symmetric algebra is graded |
---
I also followed `TensorAlgebra` and `ExteriorAlgebra` here.
I used Claude to initialize the proof.
[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
55/0 |
Mathlib.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Grading.lean |
2 |
1 |
['github-actions'] |
nobody |
33-63157 1 month ago |
33-63936 33 days ago |
33-63929 33 days |
0 |
| 43781 |
vlad902 author:vlad902 |
chore(AffineSpace/Independent): remove two `backward.isDefEq.respectTransparency` |
---
<!-- Your PR title will become the first line of the commit message.
In this box, the text above the `---` (if not empty) will be appended
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t-algebra
tech debt
label:t-algebra$ |
3/7 |
Mathlib/LinearAlgebra/AffineSpace/Independent.lean |
1 |
1 |
['github-actions'] |
nobody |
33-22731 1 month ago |
33-25092 33 days ago |
33-25085 33 days |
0 |
| 42363 |
ghseeli author:ghseeli |
feat(Combinatorics): card_le_card_biUnion_of_card_le_card |
This PR contributes a lemma to combinatorics, `card_le_card_biUnion_of_card_le_card`. this is a set theoretic corollary of a double counting result proved for bipartite graphs (`Finset.sum_card_bipartiteAbove_eq_sum_card_bipartiteBelow`). This result was needed for our Latin Square PR https://github.com/leanprover-community/mathlib4/pull/36698. This result was proved in less general terms in that PR, but is independent of Latin Square considerations and so we have generalized and moved it into this file.
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|
t-combinatorics
new-contributor
|
38/0 |
Mathlib/Combinatorics/Enumerative/DoubleCounting.lean |
1 |
16 |
['cjrl', 'github-actions', 'vlad902', 'wwylele'] |
nobody |
33-16058 1 month ago |
63-5799 63 days ago |
75-83710 75 days |
1 |
| 40782 |
tb65536 author:tb65536 |
feat(Combinatorics/SimpleGraph/Coloring/EdgeLabeling): add predicates for monochromatic subsets |
This PR adds predicates for monochromatic subsets, in preparation for Ramsey theory.
Co-authored-by: Bhavik Mehta <bhavikmehta8@gmail.com>
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|
t-combinatorics |
143/0 |
Mathlib/Combinatorics/SimpleGraph/Coloring/EdgeLabeling.lean |
1 |
28 |
['SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'tb65536'] |
nobody |
32-25252 1 month ago |
32-26053 32 days ago |
108-67660 108 days |
0 |
| 43820 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/Maps): dualize `Embedding.completeGraph` and `Copy.topEmbedding` |
Also `Copy.topEmbedding` doesn't need a `Copy`, it can use a `Hom`, unlike its dual `Copy.botEmbedding`.
---
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|
t-combinatorics |
115/15 |
Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean |
3 |
1 |
['github-actions'] |
nobody |
32-3194 1 month ago |
32-5392 32 days ago |
32-5385 32 days |
0 |
| 38434 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/Maps): `map` lemmas about support/top/bot |
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics |
16/0 |
Mathlib/Combinatorics/SimpleGraph/Maps.lean |
1 |
3 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
31-82238 1 month ago |
36-28346 36 days ago |
36-29184 36 days |
0 |
| 42960 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/Trails): an Eulerian walk is chordless |
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|
t-combinatorics |
4/0 |
Mathlib/Combinatorics/SimpleGraph/Trails.lean |
1 |
4 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
31-81279 1 month ago |
31-82052 31 days ago |
54-65157 54 days |
0 |
| 41623 |
SnirBroshi author:SnirBroshi |
feat(SimpleGraph/Trails): a walk is Eulerian iff it is a trail of length `G.edgeSet.encard` |
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|
t-combinatorics |
38/3 |
Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Trails.lean |
2 |
3 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
31-80672 1 month ago |
31-81469 31 days ago |
93-79587 93 days |
0 |
| 41524 |
SnirBroshi author:SnirBroshi |
feat(SimpleGraph/Trails): in a preconnected Eulerian graph there exists an Eulerian circuit from any vertex |
This lets us take a circuit at a specific vertex, much like [`IsHamiltonian.exists_isHamiltonianCycle`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Combinatorics/SimpleGraph/Hamiltonian.html#SimpleGraph.IsHamiltonian.exists_isHamiltonianCycle) in Hamiltonian graphs.
---
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|
t-combinatorics |
21/0 |
Mathlib/Combinatorics/SimpleGraph/Trails.lean |
1 |
6 |
['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vlad902'] |
nobody |
31-80589 1 month ago |
31-81302 31 days ago |
96-31667 96 days |
1 |
| 38499 |
SnirBroshi author:SnirBroshi |
feat(Order/Hom/Basic): `Relation.Map`/`Function.bicompl` form an order isomorphism between relations |
For injective functions `f` and `g`, `Relation.Map · f g` is an order embedding between relations.
For surjective functions `f` and `g`, `Function.bicompl · f g` is an order embedding between relations.
For bijective functions `f` and `g`, `Relation.Map · f g` and `Function.bicompl · f g` form an order isomorphism between relations.
---
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[](https://gitpod.io/from-referrer/)
|
t-order |
46/0 |
Mathlib/Order/Hom/Basic.lean |
1 |
7 |
['SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'plp127', 'wwylele'] |
nobody |
31-77273 1 month ago |
36-28350 36 days ago |
40-39347 40 days |
0 |
| 43793 |
justus-springer author:justus-springer |
doc(Algebra/Group/SelfInv): extend module docstring |
Follow-up to #42611. Explains the original motivation for this.
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|
t-algebra label:t-algebra$ |
7/0 |
Mathlib/Algebra/Group/SelfInv.lean |
1 |
8 |
['SnirBroshi', 'YaelDillies', 'eric-wieser', 'github-actions', 'justus-springer'] |
nobody |
31-72037 1 month ago |
32-34734 32 days ago |
32-43986 32 days |
0 |
| 37878 |
YaelDillies author:YaelDillies |
chore(Combinatorics/SimpleGraph): avoid structure relation predicates |
Relation predicates used to be `def`s over a `forall`, which was optimal for usability in fields of other structures. This changed in #35591 and #35192 as a byproduct of reducing apparent code duplication. Unfortunately, the usability issue was overlooked.
This PR restores usability by dropping the use of those relation classes that are `structure`s, ie `Std.Irrefl` and `Std.Transitive`.
---
- [x] depends on: #38554
I would also be happy to revert #35591 and #35192 since this demonstrates a good use case for the `def` versions of the relation predicates.
[](https://gitpod.io/from-referrer/)
|
t-combinatorics |
111/117 |
Archive/Wiedijk100Theorems/Konigsberg.lean,Mathlib/Combinatorics/Graph/Simple.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Dart.lean,Mathlib/Combinatorics/SimpleGraph/Density.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean,Mathlib/Combinatorics/SimpleGraph/FiveWheelLike.lean,Mathlib/Combinatorics/SimpleGraph/Hall.lean,Mathlib/Combinatorics/SimpleGraph/LineGraph.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Operations.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Prod.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Sum.lean,Mathlib/Combinatorics/SimpleGraph/Trails.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Tripartite.lean,Mathlib/ModelTheory/Graph.lean,Mathlib/Order/Cover.lean,Mathlib/Order/RelClasses.lean |
25 |
27 |
['SnirBroshi', 'Vierkantor', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
31-47156 1 month ago |
31-52228 31 days ago |
136-58187 136 days |
0 |
| 43846 |
tb65536 author:tb65536 |
feat(GroupTheory/Finiteness): instances for `IsMulFG (closure s)` |
This PR adds missing instances for `IsMulFG (closure s)` that will replace the existing instances for the old finiteness definitions.
---
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|
t-algebra
t-group-theory
label:t-algebra$ |
21/25 |
Mathlib/GroupTheory/Commutator/Finite.lean,Mathlib/GroupTheory/Finiteness.lean |
2 |
1 |
['github-actions'] |
nobody |
31-22385 1 month ago |
31-22465 31 days ago |
31-22459 31 days |
0 |
| 41304 |
plp127 author:plp127 |
chore(Data/Set/Lattice): `Sort*` polymorphism |
Generalize some theorems from `Type*` to `Sort*`.
---
- [x] depends on: #39857
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|
t-order |
30/25 |
Mathlib/Data/Set/Lattice/Bounded.lean,Mathlib/Data/Set/Lattice/Indexed.lean |
2 |
6 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
31-21560 1 month ago |
31-23673 31 days ago |
31-37604 31 days |
0 |
| 43850 |
tb65536 author:tb65536 |
feat(GroupTheory/Finiteness): `IsMulFG iSup` |
This PR adds missing theorems for `IsMulFG iSup` that will replace the existing theorems for the old finiteness definitions.
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|
t-algebra
t-group-theory
label:t-algebra$ |
74/22 |
Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/GroupTheory/Finiteness.lean |
2 |
1 |
['github-actions'] |
nobody |
31-21136 1 month ago |
31-21187 31 days ago |
31-21182 31 days |
0 |
| 43819 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/DeleteEdges): morphisms between `deleteEdges` graphs |
Accepting two sets and a proof of `Sym2.map f ⁻¹' t ⊆ s` lets us use the morphisms with `Set.preimage` or `Set.image` or anything else that's convenient.
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|
t-combinatorics |
74/1 |
Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/DeleteEdges.lean |
2 |
5 |
['SnirBroshi', 'b-mehta', 'github-actions'] |
nobody |
30-68141 1 month ago |
30-68335 30 days ago |
31-26500 31 days |
2 |
| 43861 |
SnirBroshi author:SnirBroshi |
chore(Algebra/Order/Achimedean/Class): use `inferInstanceAs%` for `LinearOrder MulArchimedeanClass` |
---
The motivation is the `TODO`; I don't know if core's `inferInstanceAs` elaborator would be better here.
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|
t-algebra label:t-algebra$ |
1/2 |
Mathlib/Algebra/Order/Archimedean/Class.lean |
1 |
1 |
['github-actions'] |
nobody |
30-66704 1 month ago |
30-67514 30 days ago |
30-67507 30 days |
0 |
| 43857 |
vihdzp author:vihdzp |
feat: split `transfiniteIterate` into `sup` and `inf` versions |
We deprecate `transfiniteIterate` and create `supTransfiniteIterate` and `infTransfiniteIterate` in its place. One of them uses suprema to compute the value at limit points, and the other uses infima.
The plan is to then use both of these definitions to deprecate `OrdinalApprox.lfpApprox` and `OrdinalApprox.gfpApprox`, which are simply specializations of these.
---
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|
tech debt
t-order
|
177/139 |
Mathlib/CategoryTheory/Abelian/GrothendieckCategory/EnoughInjectives.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsClosure.lean,Mathlib/CategoryTheory/Presentable/SharplyLT/Basic.lean,Mathlib/Order/TransfiniteIteration.lean |
4 |
1 |
['github-actions'] |
nobody |
29-72208 29 days ago |
30-78241 30 days ago |
30-79125 30 days |
0 |
| 43770 |
vlad902 author:vlad902 |
feat(AffineSpace/FiniteDimensional): generalize typeclasses |
A number of theorems/instances are stated at the top of the file for `DivisionRing`, but the assumption could be weakened to `Ring` with some theorems further requiring
`Nontrivial`/`StrongRankCondition`/`OrzechProperty`. Weakening to `Ring` also requires renaming some `FiniteDimensional` assumptions to `Module.Finite`.
This PR weakens moves around some theorems/instances to fit their new sections assumptions and renames some theorems/instances to match their new conclusions. No theorems are added/removed.
---
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|
t-algebra label:t-algebra$ |
164/106 |
Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean |
1 |
7 |
['github-actions', 'grunweg', 'leanprover-radar', 'mathlib-merge-conflicts', 'vlad902'] |
nobody |
29-34114 29 days ago |
30-67115 30 days ago |
33-40731 33 days |
0 |
| 42766 |
harahu author:harahu |
chore(Order): tidy markdown headers |
This PR:
- Ensures all files in `Mathlib/Order` have an H1 header.
- Aligns some H2 headers with the examples in the documentation style guide.
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|
t-order |
8/5 |
Mathlib/Order/Comparable.lean,Mathlib/Order/CompleteSublattice.lean,Mathlib/Order/Completion.lean,Mathlib/Order/Interval/Set/OrdConnectedLinear.lean,Mathlib/Order/Quotient.lean,Mathlib/Order/Types/Arithmetic.lean |
6 |
1 |
['Multramate', 'github-actions'] |
nobody |
29-33582 29 days ago |
63-49993 63 days ago |
63-49986 63 days |
0 |
| 42670 |
harahu author:harahu |
chore(Combinatorics): tidy markdown headers |
Ensure files in `Mathlib/Combinatorics` have one and only one H1 header, thus enforcing the style guide.
Newly created headers in this PR were authored by Claude Opus 5.
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|
t-combinatorics |
11/5 |
Mathlib/Combinatorics/Enumerative/Catalan/Tree.lean,Mathlib/Combinatorics/Quiver/ConnectedComponent.lean,Mathlib/Combinatorics/Quiver/Subquiver.lean,Mathlib/Combinatorics/Quiver/Symmetric.lean,Mathlib/Combinatorics/SimpleGraph/Cayley.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean |
6 |
1 |
['Multramate', 'github-actions'] |
nobody |
29-33528 29 days ago |
65-60602 65 days ago |
65-62158 65 days |
0 |
| 27050 |
BoltonBailey author:BoltonBailey |
doc(Control/Monad/Cont): add docstrings |
Split of #25917. This PR adds docstrings to this file.
This documentation was written by a few versions of Claude (Claude 3.5 Sonnet and Fable 5) , with human supervision.
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|
t-data
LLM-generated
tech debt
|
64/22 |
Mathlib/Control/Monad/Cont.lean,scripts/nolints.json |
2 |
10 |
['BoltonBailey', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
29-14631 29 days ago |
29-18176 29 days ago |
30-16210 30 days |
0 |
| 35881 |
astrainfinita author:astrainfinita |
chore: do not use `inf` `sup` in `LinearOrder` lemmas |
`max` and `sup` have been unified into the same function. It is no longer necessary to create lemmas about `sup` for `LinearOrder`.
This PR moves `max` lemmas to an earlier file to ensure that files importing deprecated `sup` lemmas can use them.
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- [ ] depends on: #35841
- [ ] depends on: #35880
- [ ] depends on: #42373
[](https://gitpod.io/from-referrer/)
|
t-order |
71/62 |
Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Group/PosPart.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/AlgebraicGeometry/OrderOfVanishing.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/ConvergenceRadius.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Analysis/Complex/UpperHalfPlane/ProperAction.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/Normed/Module/Seminorm/Basic.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Nat/Factorization/LCM.lean,Mathlib/MeasureTheory/Measure/PreVariation.lean,Mathlib/MeasureTheory/Measure/Stieltjes.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/NumberTheory/AbelSummation.lean,Mathlib/NumberTheory/LSeries/PrimesInAP.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Summable.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/Order/BoundedOrder/Lattice.lean,Mathlib/Order/BourbakiWitt.lean,Mathlib/Order/Filter/ENNReal.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Interval/Set/LinearOrder.lean,Mathlib/Order/Lattice.lean,Mathlib/Probability/Moments/Basic.lean,Mathlib/Probability/Moments/IntegrableExpMul.lean,Mathlib/Probability/Process/LocalProperty.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean,Mathlib/RingTheory/MvPowerSeries/GaussNorm.lean,Mathlib/RingTheory/Polynomial/HilbertPoly.lean,Mathlib/RingTheory/PowerSeries/WeierstrassPreparation.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/Topology/MetricSpace/Algebra.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/MetricSpace/Infsep.lean,Mathlib/Topology/Semicontinuity/Basic.lean,Mathlib/Topology/Sion.lean |
39 |
5 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
28-55129 28 days ago |
28-58822 28 days ago |
28-59632 28 days |
0 |
| 43902 |
seewoo5 author:seewoo5 |
feat(Trigonometric): define coth and prove basic properties |
---
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Define `Complex.coth`, `Real.coth` and prove basic theorems (almost same as those of `tanh`). I found that there's `cot` but no `coth` yet.
[](https://gitpod.io/from-referrer/)
|
t-analysis |
37/0 |
Mathlib/Analysis/Complex/Trigonometric.lean |
1 |
8 |
['SnirBroshi', 'github-actions', 'luigi-massacci', 'seewoo5'] |
nobody |
27-63430 27 days ago |
28-69962 28 days ago |
29-21338 29 days |
0 |
| 43958 |
kebekus author:kebekus |
feat: simplify computations in complex analysis by extracting frequently-used lemmas |
Simplify several computations in complex analysis by extracting lemmas that are used more than once. At present, the gain is real but modest. It will become more visible as more computations are added.
---
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[](https://gitpod.io/from-referrer/)
|
t-analysis
LLM-generated
|
57/56 |
Mathlib/Analysis/Complex/JensenFormula.lean,Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/SpecialFunctions/Complex/CircleMap.lean,Mathlib/Analysis/SpecialFunctions/Integrals/PosLog.lean |
4 |
1 |
['github-actions'] |
nobody |
27-59523 27 days ago |
27-59523 27 days ago |
27-59516 27 days |
0 |
| 43957 |
thomaskwaring author:thomaskwaring |
feat(Order/Hom): congruence of order homs by order isos |
Order isomorphisms between domains and codomains induce equivalences between types of order homomorphisms: `{Sup/Inf/Lattice/SupBot/InfTop/BoundedLattice/sSup/sInf/Frame/CompleteLattice}Hom`.
[](https://gitpod.io/from-referrer/)
|
t-order |
78/0 |
Mathlib/Order/Hom/BoundedLattice.lean,Mathlib/Order/Hom/CompleteLattice.lean,Mathlib/Order/Hom/Lattice.lean |
3 |
1 |
['github-actions'] |
nobody |
27-59460 27 days ago |
27-64144 27 days ago |
27-64164 27 days |
1 |
| 43963 |
vihdzp author:vihdzp |
chore(Topology/CantorBendixson): minor cleanup |
`CantorBendixson` is not a type, and the names in this file shouldn't clash with anything else, so we un-namespace the material in this file.
We also rewrap some lines and perform minor golfs.
---
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I haven't added deprecations since the material here is quite new, but I can add them if they're nevertheless wanted.
[](https://gitpod.io/from-referrer/)
|
t-topology |
18/38 |
Mathlib/Topology/CantorBendixson.lean |
1 |
1 |
['github-actions'] |
nobody |
27-52481 27 days ago |
27-53747 27 days ago |
27-53826 27 days |
0 |
| 42833 |
YaelDillies author:YaelDillies |
feat(Combinatorics/SimpleGraph/Connectivity): efficient decidability instances |
Currently, the `DecidableRel G.Reachable` instance provided by mathlib works by enumerating *all* walks from `u` to `v` of length less than `Fintype.card V`, which takes time exponential in the number of vertices. Currently also, the `Decidable G.Preconnected` and `Decidable G.Connected` instances build on the `DecidableRel G.Reachable` one and suffer from the same exponential slowdown.
This PR reworks those instances to use breadth-first search, which is polynomial in the number of vertices. Since the BFS doesn't depend on the starting vertex, we wrap it in `Trunc` to cut down an unnecessary factor of `Fintype.card V` (this makes a difference only if the graph is NOT preconnected).
This showed up in FormalConjectures because a contributor used `decide +native` to prove that some concrete graph on 11 vertices was connected. Their proof timed out while I was bumping the repo to v4.30.
Also make `G` implicit in a bunch of non-rewriting lemmas.
From FormalConjectures
Generated by Claude Opus following my idea, largely rewritten manually afterwards.
Assisted-by: Claude Opus 4.8
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics
LLM-generated
|
343/31 |
Mathlib/Combinatorics/SimpleGraph/Connectivity/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/List/Nodup.lean,MathlibTest/SimpleGraph.lean |
5 |
9 |
['SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions'] |
nobody |
27-44094 27 days ago |
27-48978 27 days ago |
29-65856 29 days |
0 |
| 43901 |
vlad902 author:vlad902 |
feat(AffineSpace): characterize affine subspaces of dimension 0 and 1 |
---
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[](https://gitpod.io/from-referrer/)
|
t-convex-geometry |
94/10 |
Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/LinearAlgebra/AffineSpace/Dimension.lean,Mathlib/Order/WithBot.lean |
3 |
2 |
['github-actions', 'vlad902'] |
nobody |
27-35035 27 days ago |
28-78446 28 days ago |
28-83750 28 days |
0 |
| 42188 |
arcaputo3 author:arcaputo3 |
feat(Combinatorics/SimpleGraph): the line graph signature identity |
For a finite simple graph `G` with `n` vertices and `m` edges, we prove the classical identity
`s(A(L(G))) = n - m + p - q`
where `s` is the signature of the (real) adjacency matrix of the line graph `L(G)`, and `(p, q)` are the numbers of positive/negative eigenvalues of `Q(G) - 2•1`, with `Q(G) = D(G) + A(G)` the signless Laplacian, all counted with multiplicity.
The proof is the Gram-pairing argument: the `V × E(G)` incidence matrix `B` satisfies `Bᵀ * B = A(L(G)) + 2•1` and `B * Bᵀ = Q(G)`, and the two products have equal nonzero spectra by `Matrix.charpoly_mul_comm'`. Eigenvalue counts are transported along the resulting root-multiset identity.
New declarations:
- `Mathlib/Analysis/Matrix/Inertia.lean`: the inertia indices `Matrix.IsHermitian.posInertia` / `negInertia` / `signature` of a real symmetric matrix, and `Matrix.IsHermitian.charpoly_add_smul_one` / `roots_charpoly_add_smul_one` (the characteristic polynomial of `A + c • 1` splits over the shifted eigenvalues).
- `Mathlib/Combinatorics/SimpleGraph/LineGraphSignature.lean`: `SimpleGraph.signlessLapMatrix`, `SimpleGraph.edgeIncMatrix` (the `V × E(G)`-indexed incidence matrix) together with the two Gram identities above (stated over an arbitrary (non-assoc) semiring), a `DecidableRel` instance for `lineGraph.Adj`, and the main theorem `SimpleGraph.signature_adjMatrix_lineGraph`.
---
**AI disclosure** (per the mathlib policy on AI-assisted contributions): this PR was formalized end-to-end with Claude Code (Anthropic model Claude Fable 5). The choice of statement and the decision to contribute are mine; the Lean proofs were authored by the tool and verified by compilation. `#print axioms SimpleGraph.signature_adjMatrix_lineGraph` reports `[propext, Classical.choice, Quot.sound]`.
Notes for reviewers:
- `signlessLapMatrix` could alternatively live in `Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean`, and the `DecidableRel G.lineGraph.Adj` instance in `LineGraph.lean`; happy to move them.
- The inertia API is deliberately minimal (what the main theorem needs); extensions (e.g. rank/inertia relations, congruence invariance / Sylvester's law) would be natural follow-ups.
- I do not yet have push access to non-master mathlib branches, so this PR comes from a fork; happy to move the branch onto the main repository once access is granted.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
new-contributor
LLM-generated
t-combinatorics
|
326/0 |
Mathlib.lean,Mathlib/Analysis/Matrix/Inertia.lean,Mathlib/Combinatorics/SimpleGraph/LineGraphSignature.lean |
3 |
2 |
['github-actions'] |
nobody |
27-7890 27 days ago |
80-43905 80 days ago |
80-43898 80 days |
0 |
| 42971 |
ashebson author:ashebson |
fix(ProfiniteGrp): simplify explicit limit projections |
The naturality proof for `ProfiniteCompletion.lift` previously needed a brittle pointwise `change`. The underlying problem was that simplification crossed several semireducible diagram/forgetful-functor boundaries at once, producing terms that are definitionally equal but no longer type-correct at implicit transparency.
This PR:
- makes the two finite-quotient diagram composites reducible abbreviations;
- states `quotientMap` using the diagram object types and maps it through the existing `FiniteGrp ⥤ ProfiniteGrp` forgetful functor;
- adds a pointwise rewrite lemma for an explicit limit projection followed by a mapped finite-group morphism (with its additive counterpart); and
- rewrites `ProfiniteCompletion.lift` naturality through that API while keeping the limit point bundled, removing the problematic pointwise `change`.
--------
## AI disclosure
AI (OpenAI Codex) was used extensively for this PR. It was used to:
- investigate the original TODO and reproduce why `dsimp` failed;
- explore and discard several possible fixes;
- identify the semireducible diagram/forgetful-functor boundaries involved;
- design and implement the final `ProfiniteGrp` API simplification and `ProfiniteCompletion.lift` proof changes;
- run the relevant Lean builds and direct compilation checks; and
- draft the commit message and PR description.
The final changes were reviewed through the resulting diff and verified locally.
|
t-topology
new-contributor
LLM-generated
|
29/12 |
Mathlib/Topology/Algebra/Category/ProfiniteGrp/Basic.lean,Mathlib/Topology/Algebra/Category/ProfiniteGrp/Completion.lean,Mathlib/Topology/Algebra/Category/ProfiniteGrp/Limits.lean |
3 |
9 |
['ashebson', 'github-actions', 'grunweg', 'mathlib-bors', 'mathlib-merge-conflicts'] |
nobody |
26-68190 26 days ago |
26-69412 26 days ago |
40-28192 40 days |
0 |
| 43985 |
kebekus author:kebekus |
feat: API for working with canonical factors |
To prepare for upcoming work in Value Distribution Theory, add three elementary lemmas on canonical factors and their derivatives.
This material is used in [Project VD](https://github.com/kebekus/ProjectVD), formalizing Value Distribution Theory for meromorphic functions on the complex plane. Claude Code was used to create this PR.
---
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[](https://gitpod.io/from-referrer/)
|
t-analysis
LLM-generated
|
86/0 |
Mathlib/Analysis/Complex/CanonicalDecomposition.lean |
1 |
1 |
['github-actions'] |
nobody |
26-61657 26 days ago |
26-61657 26 days ago |
26-61650 26 days |
0 |
| 42136 |
mitchell-horner author:mitchell-horner |
feat(Combinatorics/SimpleGraph): API for `labelledCopyCount` |
Add API for `SimpleGraph.labelledCopyCount`.
---
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using the following format:
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- [ ] depends on: #xyz [optional extra text]
-->
[](https://gitpod.io/from-referrer/)
|
t-combinatorics |
63/1 |
Mathlib/Combinatorics/SimpleGraph/Copy.lean |
1 |
1 |
['github-actions'] |
nobody |
26-59537 26 days ago |
81-50568 81 days ago |
81-50561 81 days |
1 |
| 42137 |
mitchell-horner author:mitchell-horner |
feat(Combinatorics/SimpleGraph): bounds for `extremalNumber` and `turanDensity` |
Add bounds for `extremalNumber` and `turanDensity`.
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics |
35/0 |
Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/TuranDensity.lean |
2 |
7 |
['SnirBroshi', 'b-mehta', 'github-actions', 'mitchell-horner'] |
nobody |
26-58940 26 days ago |
48-55402 48 days ago |
81-49590 81 days |
1 |
| 43886 |
gabriel-turinici author:gabriel-turinici |
feat(Analysis/Asymptotics): add Filter.Tendsto.weighted_cesaro_smul |
Adds `Filter.Tendsto.weighted_cesaro_smul`, a weighted (Toeplitz-type) generalization of `Filter.Tendsto.cesaro_smul`: if `S k → L` and `w k ≥ 0` has divergent partial sums, the weighted running average of `S` w.r.t. `w` also tends to `L`. Recovers `cesaro_smul` as the `w ≡ 1` case. Also adds `weighted_cesaro`, the real-valued convenience wrapper mirroring `cesaro`.
This is a small building block toward a planned follow-up PR formalizing Kronecker's lemma, at its turn needed in some stochastic analysis setting.
---
**AI disclosure**: this proof was developed using formatting assistance, library search and code corrections from Claude Code (Claude Sonnet 5) and a personal LLM automation. Alternative, shorter, proofs can be obtained with `IsLittleO`-style but that style seems too recent for me now.
[](https://gitpod.io/from-referrer/) |
t-analysis
new-contributor
LLM-generated
|
81/0 |
Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean |
1 |
2 |
['github-actions'] |
nobody |
26-47499 26 days ago |
30-16478 30 days ago |
30-16471 30 days |
0 |
| 34078 |
joneugster author:joneugster |
feat(scripts/autolabel): add more label dependencies |
Add more label dependencies.
---
- [x] depends on: #34948
- [x] depends on: #34949
- [x] depends on: #34066
- [x] depends on: #34079
- [x] depends on: #34677
- [x] depends on: #34678
- [x] depends on: #34952
- [x] depends on: #36242
[](https://gitpod.io/from-referrer/)
|
CI |
31/11 |
scripts/autolabel.lean |
1 |
4 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
26-39084 26 days ago |
59-13898 59 days ago |
59-14176 59 days |
0 |
| 44005 |
seewoo5 author:seewoo5 |
feat(MonotoneConvergence): strict versions of `ge_of_tendsto` |
---
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Strict versions of `Monotone.ge_of_tendsto` and similar theorems: `StrictMono.gt_of_tendsto`, `StrictMono.lt_of_tendsto`, `StrictAnti.lt_of_tendsto`, `StrictAnti.gt_of_tendsto`. These require extra hypothesis such as `NoMaxOrder β` or `NoMinOrder β`. Claude is used to find the hypothesis and write initial proofs.
Context: In Sphere packing project, there is an inequality of the form $f(t) < L$ for a strictly decreasing function $f$ on $(0, \infty)$ with $\lim_{t \to 0^+} f(t) = L$. Currently, this is proved by $f(t) < f(t/2) \le L$, where the last step uses `ge_of_tendsto`. With new theorems in this PR, we don't need to consider $f(t/2)$ anymore (by using `StrictAnti.gt_of_tendsto`).
[](https://gitpod.io/from-referrer/)
|
t-topology
LLM-generated
sphere-packing
|
28/0 |
Mathlib/Topology/Order/MonotoneConvergence.lean |
1 |
1 |
['github-actions'] |
nobody |
26-38494 26 days ago |
26-41136 26 days ago |
26-41129 26 days |
0 |
| 29744 |
espottesmith author:espottesmith |
feat(Combinatorics): define directed hypergraphs |
This PR defines directed hypergraphs:
```
@[ext]
structure DiHypergraph (α : Type*) where
/-- The vertex set -/
vertexSet : Set α
/-- The edge set -/
edgeSet : Set ((Set α) × (Set α))
/-- Each edge is a pair (s, d), where s ⊆ vertexSet and d ⊆ vertexSet -/
edge_src_dst_isSubset_vertexSet' : ∀ ⦃e⦄, e ∈ edgeSet → e.1 ⊆ vertexSet ∧ e.2 ⊆ vertexSet
```
Additional definitions:
- tail/head stars and negative/positive stars
- some special cases (B-Graph, F-Graph, BF-Graph, and what I'm calling a "non-endless" dihypergraph, where neither the source/tail nor the destination/head are empty)
- Vertex and (hyper)edge adjacency
- isolated vertices
- empty and nonempty dihypergraphs
The design employed here is based off of #28613, but this PR does not depend on that one.
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics
new-contributor
|
290/0 |
Mathlib.lean,Mathlib/Combinatorics/DiHypergraph/Basic.lean |
2 |
12 |
['SnirBroshi', 'b-mehta', 'espottesmith', 'github-actions', 'mathlib4-merge-conflict-bot', 'pimotte'] |
nobody |
26-32417 26 days ago |
117-40639 117 days ago |
254-44380 254 days |
1 |
| 43780 |
SashaIr author:SashaIr |
feat: q-analogs |
An implementation of q-analogs, q-binomials, and counting results.
---
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[](https://gitpod.io/from-referrer/)
|
new-contributor
t-combinatorics
|
965/0 |
Mathlib.lean,Mathlib/Combinatorics/QAnalog/Basic.lean,Mathlib/Combinatorics/QAnalog/Binomial.lean,Mathlib/Combinatorics/QAnalog/Counting.lean,Mathlib/Combinatorics/QAnalog/Subspace.lean |
5 |
7 |
['SashaIr', 'SnirBroshi', 'b-mehta', 'github-actions'] |
nobody |
26-23160 26 days ago |
33-21130 33 days ago |
33-21479 33 days |
0 |
| 38334 |
8e7 author:8e7 |
feat(Combinatorics/SimpleGraph/TreeDecomp): define tree decompositions |
Add definition for tree decompositions on simple graphs. Define the tree width of a simple graph and prove basic statements and conversions.
```lean
structure TreeDecomp (G : SimpleGraph V) (W : Type) where
/-- The set of vertices in each bag. -/
bag : W → Finset V
/-- The graph adjacency relation of bags. -/
tree : SimpleGraph W
/-- T must be a tree. -/
isTree : IsTree tree
/-- All vertices in G must appear in some bag. -/
vertexCover : ∀ v : V, ∃ w : W, v ∈ bag w
/-- For any edge (u, v) in G, there is a bag containing both u and v. -/
edgeCover ⦃u v : V⦄ : G.Adj u v → ∃ w : W, u ∈ bag w ∧ v ∈ bag w
/-- For any vertex v in G, the set of bags that contain v is preconnected. -/
connectedBags : ∀ v : V, (tree.induce ({w | v ∈ bag w})).Preconnected
```
AI Usage: Some proofs are written with the help of Claude Code, and everything has been manually reviewed.
---
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- [x] depends on: #38027
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-combinatorics
LLM-generated
|
395/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/TreeDecomp.lean |
2 |
42 |
['8e7', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
26-5201 26 days ago |
82-79639 82 days ago |
106-62967 106 days |
1 |
| 44027 |
kim-em author:kim-em |
chore(RingTheory/Unramified/LocalRing): explain the backward.inferInstanceAs.wrap.data option |
This PR adds a comment explaining why `FormallyUnramified.isField_quotient_map_maximalIdeal` needs `set_option backward.inferInstanceAs.wrap.data false`, and that the option can be removed once https://github.com/leanprover/lean4/issues/13408 (Kernel error for `inferInstanceAs` with let declarations) is fixed. A fix is proposed in https://github.com/leanprover/lean4/pull/15245.
🤖 Prepared with Claude Code |
t-ring-theory |
3/0 |
Mathlib/RingTheory/Unramified/LocalRing.lean |
1 |
1 |
['github-actions'] |
nobody |
25-73048 25 days ago |
25-74415 25 days ago |
25-74408 25 days |
0 |
| 44026 |
kim-em author:kim-em |
chore: remove backward.privateInPublic in category theory, topology and analysis |
This PR removes the `backward.privateInPublic` option in 6 files across category theory, topology and analysis. In each case a private definition appeared in the statement of a public declaration, so it was already part of the public interface in all but name. The fix is to drop `private` from those definitions (and from the auxiliary definitions their bodies depend on in exposed sections), adding docstrings where they were missing. In `Analysis/InnerProductSpace/OfNorm` the auxiliary inner product `inner_` moves into the `InnerProductSpaceable` namespace rather than becoming a root-level name; the public lemmas `inner_.norm_sq`, `inner_.conj_symm` and `Continuous.inner_` already carried its name. In `Topology/Category/Compactum` the helper `cl` gets a mathematical docstring, and the two lemmas about it that are only used in proofs stay private.
Files where a private *lemma* appeared in a public statement, and the files with file-wide `public section` restructuring, are handled in #44032. Names are otherwise kept as they were; suggestions for better names are welcome but are not needed for this PR.
🤖 Prepared with Claude Code |
tech debt |
19/63 |
Mathlib/Analysis/InnerProductSpace/OfNorm.lean,Mathlib/CategoryTheory/Monoidal/Internal/FunctorCategory.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/Topology/Category/Compactum.lean,Mathlib/Topology/Category/TopCat/Limits/Konig.lean,Mathlib/Topology/MetricSpace/GromovHausdorff.lean |
6 |
1 |
['github-actions'] |
nobody |
25-60992 25 days ago |
25-75724 25 days ago |
25-75717 25 days |
0 |
| 44024 |
kim-em author:kim-em |
chore: remove backward.privateInPublic in algebra, combinatorics and number theory |
This PR removes the `backward.privateInPublic` option in 9 files across algebra, combinatorics, number theory, order theory and set theory. In each case a private definition appeared in the statement of a public declaration, so it was already part of the public interface in all but name. The fix is to drop `private` from those definitions, adding docstrings where they were missing. In `Algebra/EuclideanDomain/Basic` the opposite direction is cleaner: the only consumer `xgcdAux_P` becomes private as well, matching the existing setup in `Data/Int/GCD`. In `Combinatorics/SetFamily/FourFunctions` the definition becomes `Finset.collapse` rather than a root-level name. In `Combinatorics/SetFamily/KruskalKatona` the predicate is marked `@[expose]`, since the file's `public section` is not exposed and the `DecidableRel` instance needs to unfold it.
Files where a private *lemma* appeared in a public statement are handled by wrapping the use site instead, in #44032. Names are kept as they were (for example `Pell.d`); suggestions for better names are welcome but are not needed for this PR.
🤖 Prepared with Claude Code |
tech debt |
14/107 |
Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SetFamily/KruskalKatona.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Increment.lean,Mathlib/GroupTheory/FreeGroup/NielsenSchreier.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/SetTheory/Ordinal/Notation.lean |
9 |
2 |
['github-actions', 'grunweg'] |
nobody |
25-59330 25 days ago |
25-59378 25 days ago |
25-64280 25 days |
0 |
| 44031 |
kim-em author:kim-em |
chore: apply mergeWithGrind suggestions from the weekly linting report |
This PR applies the `linter.tacticAnalysis.mergeWithGrind` suggestions from the weekly linting report of 2026-09-21 (https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Weekly.20linting.20log/near/625644995): in each flagged proof the tactic preceding a terminal `grind` call is redundant and is removed. In `Combinatorics/SimpleGraph/Acyclic.lean` this also restores the original proof recorded in an adaptation note, which now works again.
Three of the 22 suggestions were false positives and are not applied: under `all_goals tac; grind` the linter only tests the first goal, and the other goals still need `tac` (`Combinatorics/SimpleGraph/Extremal/Turan.lean` and two lemmas in `Analysis/SpecialFunctions/Log/Basic.lean`).
🤖 Prepared with Claude Code |
tech debt |
10/46 |
Mathlib/Algebra/QuadraticAlgebra/Discriminant.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/AlgebraicTopology/SimplexCategory/ToMkOne.lean,Mathlib/AlgebraicTopology/SimplicialObject/ChainHomotopy.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/SpecialFunctions/Integrability/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/Multiset/Find.lean,Mathlib/MeasureTheory/VectorMeasure/IntegrationByParts.lean,Mathlib/NumberTheory/FundamentalDiscriminant.lean,Mathlib/NumberTheory/Height/EllipticCurve.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/Topology/Instances/AddCircle/Defs.lean |
16 |
3 |
['github-actions', 'grunweg', 'leanprover-radar'] |
nobody |
25-57788 25 days ago |
25-61277 25 days ago |
25-61570 25 days |
0 |
| 43953 |
hasjack author:hasjack |
feat(Combinatorics/SimpleGraph/LapMatrix): bound Laplacian eigenvalues by `|V|` |
Prove that every Laplacian eigenvalue of a finite simple graph is at most
the number of vertices, via comparison of the Rayleigh quotient with the
complete graph. Also record the underlying quadratic-form bound
`xᵀ L x ≤ |V| · ‖x‖²`.
---
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[](https://gitpod.io/from-referrer/)
Adds `dotProduct_mulVec_lapMatrix_le_card` and `eigenvalues_lapMatrix_le_card`
in `LapMatrix.lean` only. The claim is the uniform bound `λ ≤ |V|` for every
indexed eigenvalue; it does not assert `|V| ∈ spectrum` for every graph.
Searched existing LapMatrix API (PSD, `zero_mem_spectrum_lapMatrix`,
`lapMatrix_top`) and did not find a card upper bound under another name.
Happy to rename if a preferred lemma already exists. |
new-contributor
t-combinatorics
LLM-generated
|
37/1 |
Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Mul.lean |
2 |
61 |
['Parcly-Taxel', 'SnirBroshi', 'github-actions', 'hasjack'] |
nobody |
25-49513 25 days ago |
26-10132 26 days ago |
28-4261 28 days |
0 |
| 43434 |
Parcly-Taxel author:Parcly-Taxel |
refactor: remove `set_option` in `ZagierTwoSquares` |
I refactor one of my very first non-porting contributions to mathlib by changing `zagierSet` to a structure `Zagier.Triple` and rewriting the whole proof to avoid `set_option`s. This required changing the type of `card_fixedPoints_modEq` to accept just `α → α` rather than `Function.End α`.
No deprecations are added since this a leaf file in Archive. |
t-number-theory
tech debt
t-group-theory
|
112/169 |
Archive/ZagierTwoSquares.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean |
2 |
3 |
['Parcly-Taxel', 'github-actions', 'jcommelin'] |
nobody |
25-48163 25 days ago |
38-71378 38 days ago |
42-48820 42 days |
0 |
| 41947 |
hawkrobe author:hawkrobe |
feat(Order/Antisymmetrization): comparable minimal elements are equivalent |
a minimal element is antisymmetrically equivalent to every comparable element satisfying the predicate, so two comparable minimal elements are equivalent in a preorder and equal in a partial order (Mathlib has the partial-order form `Minimal.eq_of_ge` but not the preorder form.)
---
[](https://gitpod.io/from-referrer/) |
new-contributor
t-order
|
25/4 |
Mathlib/Logic/Relation.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Bounds/Basic.lean |
3 |
3 |
['github-actions', 'hawkrobe'] |
nobody |
25-38776 25 days ago |
88-82824 88 days ago |
88-82817 88 days |
0 |
| 43187 |
gaetanserre author:gaetanserre |
chore: tag some measurability lemmas with `fun_prop` |
Tag some measurability lemma with `fun_prop`. These lemmas were not tagged most likely because one of the subgoals was of the form `MeasurableSet ...`. However, tagging them and using `fun_prop (disch := measurability)` can close goals that require these lemmas.
---
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|
|
3/0 |
Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/Probability/Kernel/Defs.lean |
3 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
25-34778 25 days ago |
25-36828 25 days ago |
49-27646 49 days |
0 |
| 41484 |
FernandoChu author:FernandoChu |
feat(CategoryTheory): kan extensions from isos |
This PR constructs lifts out of isomorphisms of 1-cells, and shows that being (abs) Kan is preserved by this. This is done for all four notions of left/right lifts/extensions.
This is needed for the oo-cosmos project.
----
**AI disclosure**. Claude was used in defining the API for the left extension case. After manually fixing its bad proofs/definitions/docstrings, Claude was later asked to replicate this for the other three cases, which I again finetuned. |
t-category-theory
LLM-generated
large-import
maintainer-merge
tech debt
|
413/79 |
Mathlib/CategoryTheory/Bicategory/Extension.lean,Mathlib/CategoryTheory/Bicategory/Kan/IsKan.lean |
2 |
24 |
['FernandoChu', 'github-actions', 'grunweg', 'robin-carlier'] |
nobody |
25-5199 25 days ago |
46-49395 46 days ago |
98-55672 98 days |
1 |
| 43785 |
kim-em author:kim-em |
chore: point Order/Atoms deprecations at the right replacements |
This PR corrects the replacement named by three deprecations in `Mathlib/Order/Atoms.lean`. `IsStronglyCoatomic.of_wellFounded_gt`, `isAtomic_of_orderBot_wellFounded_lt` and `isCoatomic_of_orderTop_gt_wellFounded` all named `instIsStronglyAtomicOfWellFoundedLT`, which is neither coatomic nor the `IsAtomic`/`IsCoatomic` instance a user of those lemmas wants; they now name `instIsStronglyCoatomicOfWellFoundedGT`, `IsStronglyAtomic.isAtomic` and `IsStronglyCoatomic.toIsCoatomic`.
A Lean nightly has grown a check comparing the type of a deprecated declaration against its replacement, which is how these surfaced.
🤖 Prepared with Claude Code
https://claude.ai/code/session_01FEhDfMiCzEAX4QJdrALfQC |
t-order |
3/3 |
Mathlib/Order/Atoms.lean |
1 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
25-1623 25 days ago |
25-5979 25 days ago |
27-24210 27 days |
0 |
| 41823 |
tb65536 author:tb65536 |
feat(Combinatorics/Design/Defs): definitions of combinatorial designs |
This PR adds the definitions of combinatorial designs.
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|
t-combinatorics |
141/0 |
Mathlib.lean,Mathlib/Combinatorics/Design/Defs.lean |
2 |
1 |
['Parcly-Taxel', 'github-actions'] |
nobody |
25-849 25 days ago |
92-20188 92 days ago |
92-20182 92 days |
1 |
| 41541 |
felixpernegger author:felixpernegger |
chore: prefer `classical` over `open scoped Classical` in proofs |
In #41423 it came up that it is preferable to use `classical` in proofs instead of `open (scoped) Classical`, as its slightly easier to maintain. This PR replaces all such occurences where it can be reasonably done.
This is likely my last PR about this topic.
(I used Claude to fix some git issue, which is why it shows up in the commit)
---
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|
|
111/58 |
Mathlib/Basic/Logic/Basic.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Defs/PartialOrder.lean |
4 |
5 |
['felixpernegger', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts'] |
nobody |
24-66849 24 days ago |
24-72428 24 days ago |
70-37278 70 days |
0 |
| 43465 |
TJHeeringa author:TJHeeringa |
feat(Analysis/InnerProductSpace/Reproducing): add bilinearform for Mercer's theorem |
Mercer's theorem provides a spectral representation to kernels satisfying an integrability condition. The proof builds on a Hilbert-Schmidt operator. This PR introduces the bilinear form used to define that operator.
---
PR #42003 introduces the corresponding integral operator.
AI:
Claude and Mistral have helped me get up to speed with how to do the measurability proofs in lean.
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|
t-analysis |
157/0 |
Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Reproducing/Mercer.lean |
2 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
24-47597 24 days ago |
36-70800 36 days ago |
40-43110 40 days |
1 |
| 40955 |
tb65536 author:tb65536 |
feat(NumberTheory/NumberField/ExistsRamified): galois groups are generated by inertia subgroups |
This PR uses Minkowski's theorem to prove that a Galois group of a number field is generated by its inertia subgroups.
---
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t-ring-theory
t-algebra
label:t-algebra$ |
50/9 |
Mathlib/NumberTheory/NumberField/ExistsRamified.lean |
1 |
4 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
24-33930 24 days ago |
59-43077 59 days ago |
59-43072 59 days |
1 |
| 43848 |
plp127 author:plp127 |
chore(Data/Nat/Init): rename recursor arguments |
Name the motive `motive` and name the minor premises according to their contents.
---
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t-data
tech debt
|
149/149 |
Archive/Imo/Imo1981Q3.lean,Archive/Imo/Imo2024Q3.lean,Mathlib/Algebra/ContinuedFractions/Euler.lean,Mathlib/Algebra/Polynomial/Sequence.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Hofer.lean,Mathlib/Combinatorics/Enumerative/Catalan/Tree.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Nat/Init.lean,Mathlib/FieldTheory/IsRealClosed/Basic.lean,Mathlib/GroupTheory/GroupAction/Jordan.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/LinearAlgebra/Eigenspace/Triangularizable.lean,Mathlib/LinearAlgebra/Finsupp/Pi.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/NumberTheory/DiophantineApproximation/Basic.lean,Mathlib/NumberTheory/FLT/Polynomial.lean,Mathlib/NumberTheory/ModularForms/LevelOne/DimensionFormula.lean,Mathlib/NumberTheory/Pell.lean,Mathlib/NumberTheory/Primorial.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Probability/Kernel/IonescuTulcea/Traj.lean,Mathlib/RingTheory/Adjoin/PowerBasis.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Etale/QuasiFinite.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/IntegralClosure/IsIntegral/AlmostIntegral.lean,Mathlib/RingTheory/Polynomial/Eisenstein/IsIntegral.lean,Mathlib/RingTheory/Polynomial/IsIntegral.lean,Mathlib/RingTheory/Polynomial/Resultant/Basic.lean,Mathlib/RingTheory/WittVector/Defs.lean,Mathlib/RingTheory/WittVector/StructurePolynomial.lean,Mathlib/RingTheory/ZariskisMainTheorem.lean,Mathlib/Topology/CWComplex/Classical/Basic.lean,Mathlib/Topology/Metrizable/Uniformity.lean |
36 |
1 |
['Parcly-Taxel', 'github-actions'] |
nobody |
24-22524 24 days ago |
30-84011 30 days ago |
31-15491 31 days |
0 |
| 44099 |
xiahongchi author:xiahongchi |
feat: maximize concave functions at stationary points |
Adds two first-order maximum principles for real concave functions:
* `ConcaveOn.le_of_hasDerivAt_eq_zero`
* `ConcaveOn.isGreatest_of_hasDerivAt_eq_zero`
They use the existing secant-slope bounds and require differentiability only at the candidate maximizer.
Tested by compiling `Mathlib/Analysis/Convex/Deriv.lean` locally. |
t-analysis
new-contributor
|
31/0 |
Mathlib/Analysis/Convex/Deriv.lean |
1 |
3 |
['github-actions'] |
nobody |
24-5967 24 days ago |
24-7197 24 days ago |
24-7190 24 days |
0 |
| 44103 |
xiahongchi author:xiahongchi |
feat: equate derivatives of ordered functions at contact points |
This adds Fréchet-derivative and scalar-derivative lemmas saying that two everywhere-ordered real-valued functions have equal derivatives wherever they agree. The proof applies Fermat’s theorem to their nonnegative difference.
This packages and generalizes the scalar envelope argument from Bryan Sanchez’s `NSBlwChain/Caveats/C2_Envelope.lean` at `Brsanch/ns-lean-proofs@b73f537d1646165fbdc0993c5b2e223355dc3469` (MIT).
The new declarations elaborate under the released toolchain; compiling the current master file there reports only one pre-existing current-Lean field-notation incompatibility before the new code. Current-toolchain CI is authoritative. |
t-analysis
new-contributor
|
20/0 |
Mathlib/Analysis/Calculus/LocalExtr/Basic.lean |
1 |
2 |
['github-actions'] |
nobody |
24-4282 24 days ago |
24-5541 24 days ago |
24-5831 24 days |
0 |
| 42825 |
wwylele author:wwylele |
feat(Analysis/SpecialFunctions): derivative of Bessel function of the first kind |
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|
t-analysis |
213/3 |
Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/SpecialFunctions/Bessel.lean,Mathlib/Analysis/SpecialFunctions/RegularizedHypergeometric.lean |
3 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
23-85142 23 days ago |
27-46400 27 days ago |
27-46393 27 days |
1 |
| 42128 |
SnirBroshi author:SnirBroshi |
feat(Order/UpperLower/CompleteLattice): induce the `PartialOrder` for `LowerSet`s from `SetLike` |
Now `#synth IsConcreteLE (LowerSet α) α` works so `SetLike.coe_subset_coe` and the like can be used with `LowerSet`s.
---
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|
t-order |
2/2 |
Mathlib/Order/Birkhoff.lean,Mathlib/Order/UpperLower/CompleteLattice.lean |
2 |
1 |
['github-actions'] |
nobody |
23-83237 23 days ago |
77-23849 77 days ago |
77-25052 77 days |
0 |
| 41728 |
vaca22 author:vaca22 |
feat(GroupTheory): prove uniqueness of ℤᵐ⁰ automorphisms |
Prove that every order-preserving multiplicative automorphism of ℤᵐ⁰ is the identity. This also gives a Unique instance for its automorphism type and a Subsingleton instance for order-preserving multiplicative normalizations from G to ℤᵐ⁰.
The proof transports an automorphism through WithZero.exp and WithZero.log to an additive automorphism of ℤ, then excludes negation by monotonicity.
------------
**AI disclosure**: this PR is primarily LLM-generated (Claude Code).
|
t-group-theory
new-contributor
LLM-generated
|
58/0 |
Mathlib/GroupTheory/ArchimedeanDensely.lean |
1 |
16 |
['github-actions', 'grunweg', 'tb65536', 'vaca22', 'wwylele'] |
nobody |
23-81508 23 days ago |
41-40495 41 days ago |
55-85030 55 days |
0 |
| 44064 |
mcdoll author:mcdoll |
chore: tag definitions with `fun_prop` |
No new lemmas are being tagged yet, just the definitions.
To fix the build, some `measurability` attributes had to be changed to `fun_prop` and a test had to be adjusted.
Only slightly controversial change could be the import of `FunProp` in `Mathlib/Logic/Function/Defs.lean`.
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|
large-import |
30/9 |
Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/Calculus/ContDiffHolder/Pointwise.lean,Mathlib/Logic/Function/Defs.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Defs.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/AEStronglyMeasurable.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/Tactic/FunProp.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/MetricSpace/Holder.lean,MathlibTest/FunPropMinimal.lean |
11 |
1 |
['github-actions'] |
nobody |
23-77671 23 days ago |
23-82043 23 days ago |
24-5557 24 days |
0 |
| 43348 |
tb65536 author:tb65536 |
chore(GroupTheory/Nilpotent): split off material on lower central series |
`GroupTheory/Nilpotent.lean` is getting rather long and messy. This PR splits off the material on lower central series to a new file.
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|
t-algebra
t-group-theory
label:t-algebra$ |
250/201 |
Mathlib.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/Nilpotent/LowerCentralSeries.lean |
3 |
3 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
23-62238 23 days ago |
23-63650 23 days ago |
41-23075 41 days |
0 |
| 44124 |
joelriou author:joelriou |
feat(Algebra/Homology/Embedding): more API for the stupid truncations |
We define the monomorphism `K.stupidTrunc e ⟶ K` when the embedding of complex shapes `e` satisfies `e.IsTruncGE`. (We also proceed to the dual definition.)
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|
t-category-theory
t-algebra
tech debt
label:t-algebra$ |
205/13 |
Mathlib/Algebra/Homology/Embedding/Restriction.lean,Mathlib/Algebra/Homology/Embedding/StupidTrunc.lean |
2 |
3 |
['github-actions', 'joelriou', 'themathqueen'] |
nobody |
23-38363 23 days ago |
23-47481 23 days ago |
23-47571 23 days |
1 |
| 44137 |
MrBrain295 author:MrBrain295 |
chore(Combinatorics/SimpleGraph): golf `Coloring.odd_length_iff_not_c… |
…ongr`
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|
t-combinatorics
new-contributor
|
1/2 |
Mathlib/Combinatorics/SimpleGraph/Coloring/Constructions.lean |
1 |
2 |
['github-actions'] |
nobody |
23-37786 23 days ago |
23-39029 23 days ago |
23-39022 23 days |
0 |
| 44138 |
pechersky author:pechersky |
chore(Topology/Instances/PNat): move topology into its own file, explicitly DiscreteTopology |
Previously, the topology on `PNat` was a by-product of the "subspace metric space" instance, as a subtype of `Nat`. Instead, we now declare the topology independently as the "bot" discrete topology, prior to the `MetricSpace` declaration, and then show the topology agrees to the "subspace metric space" one.
In the future, we will be able to move the topology declaration even earlier, to where the topologies of `Nat` and `Int` live.
Factored out #40785, as requested by
https://github.com/leanprover-community/mathlib4/pull/40785/changes#r3574283818
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Could be somewhat cleaner if #43876 is merged. |
t-topology |
19/5 |
Mathlib/Topology/Instances/PNat.lean |
1 |
4 |
['Ruben-VandeVelde', 'github-actions', 'pechersky'] |
nobody |
23-26790 23 days ago |
23-36939 23 days ago |
23-36932 23 days |
1 |
| 34094 |
Brian-Nugent author:Brian-Nugent |
feat(Topology/Sheaves): use `abbrev` for `Presheaf`, `IsSheaf`, and 'Sheaf' |
Changing `TopCat.Presheaf`, `TopCat.Presheaf.IsSheaf`, and 'TopCat.Sheaf' from defs to abbrevs.
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t-topology |
6/7 |
Mathlib/Topology/Sheaves/AddCommGrpCat.lean,Mathlib/Topology/Sheaves/Flasque.lean,Mathlib/Topology/Sheaves/LocallySurjective.lean,Mathlib/Topology/Sheaves/Sheaf.lean |
4 |
5 |
['Brian-Nugent', 'github-actions', 'leanprover-radar', 'robin-carlier'] |
nobody |
23-25459 23 days ago |
23-26706 23 days ago |
27-1026 27 days |
0 |
| 41565 |
grunweg author:grunweg |
chore: specify doc-strings of auto-generated additive declarations di… |
…rectly
There's no need for add_decl_doc any more.
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|
64/107 |
Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Group/Action/Basic.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/Hom.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Order/BigOperators/Group/Finset.lean,Mathlib/GroupTheory/Finiteness.lean,Mathlib/MeasureTheory/Group/Action.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/Topology/Algebra/ConstMulAction.lean |
12 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
23-10650 23 days ago |
23-13666 23 days ago |
43-53656 43 days |
0 |
| 42921 |
tb65536 author:tb65536 |
chore(RingTheory/RamificationInertia/Ramification): reorganize proofs |
This PR reorganizes the proofs in `RingTheory/RamificationInertia/Ramification.lean` so that `ramificationIdx_eq_normalizedFactors_count` is proved directly rather than relying on `IsDedekindDomain.ramificationIdx'_eq_normalizedFactors_count` which will soon be deprecated.
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t-ring-theory
t-algebra
label:t-algebra$ |
43/40 |
Mathlib/RingTheory/RamificationInertia/Ramification.lean |
1 |
3 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
22-64326 22 days ago |
22-65362 22 days ago |
58-50804 58 days |
0 |
| 43419 |
JovanGerb author:JovanGerb |
feat: tag `Metric.closedBall_subset_ball` with `@[gcongr strict]` |
This PR uses `@[gcongr strict]` on `Metric.closedBall_subset_ball` so that it can be used by `gcongr` and `grw`. This means that we will be able to rewrite with a strict inequality to turn a closed ball into an open ball or vice versa.
I golfed away some uses of `Metric.closedBall_subset_ball` using `grw`. To aid this, I also added some more `@[gcongr]` attributes.
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t-analysis |
50/45 |
Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/CStarAlgebra/SpecialFunctions/PosPart.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Complex/Harmonic/MeanValue.lean,Mathlib/Analysis/Complex/Harmonic/Poisson.lean,Mathlib/Analysis/Complex/Schwarz.lean,Mathlib/Analysis/Complex/TaylorSeries.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/InnerProductSpace/Harmonic/Basic.lean,Mathlib/Analysis/InnerProductSpace/Harmonic/HarmonicContOnCl.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Group/AddCircle.lean,Mathlib/MeasureTheory/Measure/Doubling.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean,Mathlib/MeasureTheory/Measure/Prokhorov.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/MetricSpace/ProperSpace/Lemmas.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean |
22 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
22-46632 22 days ago |
22-48677 22 days ago |
31-47049 31 days |
0 |
| 43099 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph): `IsSubwalk` is a partial order and more relation properties |
---
The instances for `Symm` and `Irrefl` let us use `symm`/`irrefl` and any other mathlib theorems that expect these properties as typeclass arguments.
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t-combinatorics |
31/4 |
Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Subwalks.lean |
6 |
1 |
['github-actions', 'vlad902'] |
nobody |
22-31059 22 days ago |
22-32097 22 days ago |
51-64864 51 days |
1 |
| 44136 |
SnirBroshi author:SnirBroshi |
chore: clean up a few `have : Std.Symm`s |
and some other relation properties
---
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|
t-order |
10/26 |
Mathlib/Algebra/Group/Basic.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/List/MinMax.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/Order/Preorder/Chain.lean,Mathlib/Topology/NatEmbedding.lean |
9 |
1 |
['Parcly-Taxel', 'github-actions'] |
nobody |
22-31028 22 days ago |
23-38455 23 days ago |
23-39070 23 days |
0 |
| 43856 |
BoltonBailey author:BoltonBailey |
chore: rename `ENNReal.toReal_mono'` |
This PR addresses tech debt by renaming `ENNReal.toReal_mono'` to `ENNReal.toReal_mono_of_top_imp_top` (and similarly renaming the related `ENNReal.toReal_le_add'`). This change makes the naming scheme more similar to `ENNReal.le_of_top_imp_top_of_toNNReal_le`
I chose these names myself, but used LLM assistance to scan the library for instances of the lemmas.
---
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|
t-topology
tech debt
|
16/10 |
Mathlib/Basic/ENNReal/Operations.lean,Mathlib/Basic/ENNReal/Real.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/MetricSpace/Thickening.lean,scripts/nolints_prime_decls.txt |
6 |
4 |
['BoltonBailey', 'github-actions', 'themathqueen'] |
nobody |
22-30163 22 days ago |
31-4483 31 days ago |
31-4476 31 days |
0 |
| 41380 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/Girth): relate `girth` and `egirth` |
Also add `le_girth` to match `le_egirth`, which is the only `egirth` lemma that's missing a `girth` counterpart.
---
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|
t-combinatorics |
39/8 |
Mathlib/Combinatorics/SimpleGraph/Girth.lean |
1 |
3 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
22-29203 22 days ago |
22-30229 22 days ago |
101-61372 101 days |
1 |
| 43197 |
SnirBroshi author:SnirBroshi |
feat(Order/Basic): relation properties of complement relations |
The complement turns `Refl` into `Irrefl`, `Total` into `Asymm`, and `Trichotomous` into `Antisymm`.
---
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|
t-order |
60/14 |
Mathlib/Basic/Rel/Separated.lean,Mathlib/Order/Antichain.lean,Mathlib/Order/Basic.lean,Mathlib/Topology/MetricSpace/MetricSeparated.lean |
4 |
5 |
['SnirBroshi', 'chenson2018', 'github-actions'] |
nobody |
22-27105 22 days ago |
22-31646 22 days ago |
47-79198 47 days |
0 |
| 25981 |
Multramate author:Multramate |
feat(GroupTheory/GroupAction/Basic): define homomorphisms of fixed subgroups induced by homomorphisms of groups |
This PR continues the work from #10126.
Original PR: https://github.com/leanprover-community/mathlib4/pull/10126 |
t-group-theory
large-import
|
68/21 |
Mathlib/Algebra/Ring/Action/Submonoid.lean,Mathlib/GroupTheory/GroupAction/Defs.lean |
2 |
8 |
['copilot-pull-request-reviewer', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
22-25740 22 days ago |
30-48948 30 days ago |
35-41631 35 days |
0 |
| 43287 |
SnirBroshi author:SnirBroshi |
chore: avoid `Subrelation` where possible |
Following the trend of avoiding `Subrelation` (e.g. #41450) in favor of `_ ≤ _`, this replaces most of its uses in Mathlib.
---
The only ones remaining are `subrelation_iff_le` (`Subrelation r s ↔ r ≤ s`) / `Acc.anti` / `WellFounded.anti` which make sense, and `Subrelation.antisymm` in `Logic/Relation.lean` because it's too early in the import hierarchy.
We could replace it with a `local instance : Std.Antisymm (α := α → α → Prop) LE.le`, but that seems a bit weird.
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t-order |
33/33 |
Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Finset/Dedup.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Multiset/Defs.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/WellFounded.lean,Mathlib/Order/WellFoundedSet.lean,Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/UniqueFactorizationDomain/Basic.lean,Mathlib/RingTheory/Valuation/Archimedean.lean |
14 |
3 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
22-25527 22 days ago |
22-30678 22 days ago |
42-43717 42 days |
0 |
| 42955 |
mpacholski author:mpacholski |
feat(diffgeo): add Hom-bundle support and fix pullback base points in T% elaborator |
# Changes
## `Mathlib/Geometry/Manifold/Notation.lean`
* **Add support for pullback bundles:** Replaced the hardcoded bound variable `x` with the dynamically extracted argument `arg`, which allows for using elaborator `T%` with pullback bundles, where the base point lies in a different manifold, e.g. `v : Π (m : M), E₁ (b m)`, where `b : M → B`.
* **Add support for Hom-bundles:** The elaborator now supports sections of Hom-bundles (`ContinuousLinearMap` between two fiber bundles, e.g. `ϕ : ∀ x, (E₁ x →L[𝕜] E₂ x`). It also supports the case where the base point lies in a different manifold (e.g. `ϕ : ∀ x, (E₁ (b x) →L[𝕜] E₂ (b x))`)
* **Support nested `TangentSpace`:** Modified `findModelFiber?` to natively intercept `TangentSpace` applications and extract the model fiber at index 2. This prevents typeclass synthesis failures when `TangentSpace` is used inside a Hom-bundle.
## `MathlibTest/DifferentialGeometry/Notation/Basic.lean`
* **Added tests for all the new usecases** this includes pullback bundles, Hom-bundles, pullback Hom-bundles, and Hom-bundles where one of the fibers is a `TangentSpace`.
## `Mathlib/Geometry/Manifold/VectorBundle/Hom.lean`
* **Refactor `Hom.lean`:** Replaced verbose `TotalSpace.mk'` boilerplate in with the newly supported `T%` syntax (e.g. `MDiffAt[s] T% ϕ x` instead of `MDiffAt[s] (fun m ↦ TotalSpace.mk' (F₁ →L[𝕜] F₂) (E := fun (x : B) ↦ (E₁ x →L[𝕜] E₂ x)) (b m) (ϕ m)) x)`
# Use of AI
The help of AI was used in writing the code in `Mathlib/Geometry/Manifold/Notation.lean`. It was hence manually edited to simplify the code as much as possible. While the author is not yet an expert in metaprogramming in Lean, he is willing to learn and receive feedback, and put all the effort to understand the presented code. The code was carefully tested with different parts of it changed and removed to make sure that every line serves a purpose to provide the expected functionality.
---
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t-differential-geometry
new-contributor
LLM-generated
|
127/36 |
Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Geometry/Manifold/VectorBundle/Hom.lean,MathlibTest/DifferentialGeometry/Notation/Basic.lean |
3 |
5 |
['github-actions', 'grunweg', 'mpacholski'] |
nobody |
22-5198 22 days ago |
57-40810 57 days ago |
57-40803 57 days |
3 |
| 43894 |
JX-Mo author:JX-Mo |
feat(RepresentationTheory): add Burnside's theorem for matrix algebras |
This PR adds Burnside's theorem: If `V` is simple module of a `k`-algebra `A` where `k` is an algebraically closed field `k`, then the algebra map `A → End_k(V)` is surjective. The proof is a combination of Schur's lemma and Jacobson density theorem, both of which are already in Mathlib. |
t-algebra label:t-algebra$ |
13/4 |
Mathlib/RepresentationTheory/AlgebraRepresentation/Basic.lean |
1 |
1 |
['github-actions'] |
nobody |
21-63556 21 days ago |
29-38318 29 days ago |
29-38409 29 days |
0 |
| 42402 |
justus-springer author:justus-springer |
refactor(AlgebraicGeometry/Birational): phase out `Scheme.Over` for rational maps |
Split off from #40871
We refactor `PartialMap.IsOver` to not use `Scheme.Hom.IsOver`, which is being phased out. We still keep it as class with one field for now (as opposed to making it an abbrev for the morphism equation directly). This is because I think it's still useful to have instances for `PartialMap.restrict` and `PartialMap.toRationalMap`. However, some things which used to be instances (`isOver_comp` and `IsOver.compHom`) now need to be lemmas.
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t-algebraic-geometry
tech debt
|
100/86 |
Mathlib/AlgebraicGeometry/Birational/Composition.lean,Mathlib/AlgebraicGeometry/Birational/RationalMap.lean |
2 |
3 |
['Brian-Nugent', 'github-actions', 'justus-springer'] |
nobody |
21-47232 21 days ago |
74-45576 74 days ago |
74-45569 74 days |
1 |
| 41946 |
Hilbert-beinghappy author:Hilbert-beinghappy |
feat(SetTheory/Descriptive/Tree): add infinite branches and bodies |
Motivation
The existing `tree A` API models trees as prefix-closed sets of finite
lists, together with some basic node operations (`take`, `subAt`,
`pullSub`). It had no notion of an infinite branch through such a
tree. Infinite branches and their collection, the body of a tree, are
basic vocabulary in descriptive set theory (e.g. to state that a tree
is well-founded iff its body is empty, or to talk about closed subsets
of Baire space as bodies of trees), so this is a natural extension of
the file.
Changes
* `initialSegment x n` is the list of the first `n` values of an
infinite sequence `x : ℕ → A`, with lemmas relating its length and
its behaviour when passing from `n` to `n + 1`.
* `IsBranch T x` says that `x : ℕ → A` is an infinite branch of `T`:
every finite initial segment of `x` lies in `T`.
* `body T` is the set of infinite branches of `T`, defined via
`IsBranch`.
* The auxiliary lemmas `nil_mem_of_isBranch` (a branch forces the root
`[]` to lie in `T`) and `body_mono` (`body` is monotone in the tree,
tagged `@[gcongr]`) round out the basic API.
Scope
This PR intentionally does not add closedness of `body T` (which
would require `A` to carry the discrete topology, so that `body T` is
closed in the product topology on `ℕ → A`), well-foundedness of trees
(which needs well-founded relations and descending chains), or rank
(which needs ordinal-valued rank API). These are left for follow-up
PRs, since each pulls in its own dependencies and deserves separate
review.
Verification
* `lake build Mathlib.SetTheory.Descriptive.Tree`
* `lake exe lint-style Mathlib.SetTheory.Descriptive.Tree`
* `lake build Mathlib`
AI use
I used Codex to help select this item from the
backlog, adapt the definitions to the existing `tree A` API and to the
`Descriptive.Tree` namespace and current module system (e.g. adding
the `public import` for `Mathlib.Data.List.OfFn`), draft the
implementation, and run the three verification commands above. I
checked every definition and lemma statement against its intended
mathematical meaning, and went through each proof term individually,
unfolding `initialSegment`, `IsBranch`, and `body` to confirm the
`simp`/`simpa` calls actually close the resulting goals rather than
just trusting that they compiled. |
t-set-theory |
42/1 |
Mathlib/SetTheory/Descriptive/Tree.lean |
1 |
1 |
['github-actions'] |
nobody |
20-80939 20 days ago |
89-2353 89 days ago |
89-2346 89 days |
0 |
| 44221 |
SamuelSchlesinger author:SamuelSchlesinger |
feat(Combinatorics/SetFamily): erdős–rado sunflower lemma |
Define `Set.IsSunflower`, a family of elements of a meet-semilattice whose distinct members pairwise meet in a fixed kernel, with a basic API around it, and then prove the Erdős–Rado sunflower lemma: a family of more than `(p - 1) ^ r * r !` finsets of size at most `r` contains a sunflower with `p` petals, together with the uniform special case.
I use this downstream to show circuit lower bounds on the clique language, but it is used in various areas of complexity and combinatorics.
This PR was assisted by Claude Opus 5.5. In particular, I extracted this from another formalization project that was also assisted by AI.
---
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|
t-combinatorics
new-contributor
LLM-generated
|
215/0 |
Mathlib.lean,Mathlib/Combinatorics/SetFamily/Sunflower.lean,docs/references.bib |
3 |
4 |
['SamuelSchlesinger', 'github-actions'] |
nobody |
20-73060 20 days ago |
20-75341 20 days ago |
20-75334 20 days |
0 |
| 44222 |
SamuelSchlesinger author:SamuelSchlesinger |
feat(Analysis/SpecialFunctions/Stirling): asymptotics of the central binomial coefficient |
Upstreaming `n.centralBinom ~ 4 ^ n / √(π * n)` and its `4 ^ n`-normalised corollaries,
needed for a Razborov–Smolensky `AC⁰[p]` lower bound in a circuit-complexity formalization,
together with the Catalan asymptotic `catalan n ~ 4 ^ n / (√π * n ^ (3 / 2))` as a first
application in Mathlib.
Drafted with Claude Code from my existing proof of the same statement, then revised by me
against Mathlib conventions.
---
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|
t-analysis
LLM-generated
new-contributor
|
85/1 |
Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Combinatorics/Enumerative/Catalan/Asymptotics.lean |
3 |
4 |
['SamuelSchlesinger', 'github-actions'] |
nobody |
20-72272 20 days ago |
20-73193 20 days ago |
20-73186 20 days |
0 |
| 43273 |
Raph-DG author:Raph-DG |
feat(AlgebraicGeometry): scheme level order of vanishing api |
In this PR, we develop some API for the order of vanishing of rational functions on schemes. We also change the file structure of order of vanishing in algebraic geometry to more closely mirror that of the ring theoretic order of vanishing results.
---
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[](https://gitpod.io/from-referrer/)
|
file-removed
t-algebraic-geometry
|
258/14 |
Mathlib.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/OrderOfVanishing/Basic.lean,Mathlib/AlgebraicGeometry/OrderOfVanishing/DVR.lean,Mathlib/AlgebraicGeometry/Restrict.lean |
5 |
3 |
['Brian-Nugent', 'Raph-DG', 'github-actions'] |
alreadydone assignee:alreadydone |
20-61748 20 days ago |
20-62985 20 days ago |
45-7415 45 days |
0 |
| 44183 |
kim-em author:kim-em |
feat(Topology/Homotopy): tube neighbourhoods of paths |
This PR adds tube neighbourhoods of paths: given a partition `0 = t₀ ≤ ⋯ ≤ tₙ = 1` (`unitInterval.Partition`) and open sets `Uᵢ` covering the segments of a path, with path-connected open sets `Vⱼ` around the vertices (`Path.Tube`), the paths lying in the tube (`Path.IsInTube`) form an open set in the compact-open topology (`Path.Tube.isOpen_setOf_isInTube`). When each `Uᵢ` is path-homotopy trivial (`IsPathHomotopyTrivial`), any two paths in a common tube are homotopic (`Path.IsInTube.homotopic`), and every path lies in such a tube in a locally path-connected space whenever its points have path-homotopy trivial neighbourhoods (`Path.exists_isInTube`).
Along the way it adds supporting path API: Lebesgue-number partitions of paths (`Path.exists_partition_in_cover`, `Path.exists_partition_with_property`), `Path.initialSegmentFamily`, cast and subpath lemmas, the quotient topology on `Path.Homotopic.Quotient`, and `Path.Homotopic.trans_left_of_nullhomotopic` / `trans_right_of_nullhomotopic`.
This is the first of four PRs constructing the universal cover (split from https://github.com/leanprover-community/mathlib4/pull/38292). It is independent of the second.
🤖 Prepared with Claude Code
|
t-topology
LLM-generated
|
420/1 |
Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Homotopy/TubeNeighborhood.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/Subpath.lean,Mathlib/Topology/UnitInterval.lean |
8 |
1 |
['github-actions'] |
nobody |
20-60221 20 days ago |
21-52968 21 days ago |
21-52961 21 days |
2 |
| 43264 |
riccardobrasca author:riccardobrasca |
feat: add Algebra.Polynomial.Laurent.Roots |
---
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[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
52/0 |
Mathlib.lean,Mathlib/Algebra/Polynomial/Laurent/Roots.lean |
2 |
1 |
['github-actions'] |
nobody |
20-47217 20 days ago |
46-31571 46 days ago |
46-31564 46 days |
0 |
| 44184 |
kim-em author:kim-em |
feat(AlgebraicTopology): semilocally simply connected spaces |
This PR defines semilocally simply connected spaces: `SemilocallySimplyConnectedAt x` says `x` has a neighbourhood `U` in which every loop at `x` is nullhomotopic in the ambient space, with `SemilocallySimplyConnectedOn` and the class `SemilocallySimplyConnectedSpace`. It proves the equivalent formulations via the fundamental group (`semilocallySimplyConnectedAt_iff_range_eq_bot`: `π₁(U, x) → π₁(X, x)` is trivial) and via paths (`semilocallySimplyConnectedAt_iff_paths`), and that simply connected spaces are semilocally simply connected.
Supporting additions: `Path.codRestrict`, groupoid lemmas relating homotopic paths to nullhomotopic loops (`Path.Homotopic.paths_homotopic_iff_loops_nullhomotopic` and friends), and `FundamentalGroup.map_fromPath` and `FundamentalGroup.map_range_eq_bot_iff`.
This is the second of four PRs constructing the universal cover (split from https://github.com/leanprover-community/mathlib4/pull/38292). It is independent of the first.
🤖 Prepared with Claude Code
|
t-topology
LLM-generated
|
270/0 |
Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SemilocallySimplyConnected.lean,Mathlib/Topology/Path.lean |
5 |
1 |
['github-actions'] |
nobody |
20-46302 20 days ago |
21-52963 21 days ago |
21-52956 21 days |
2 |
| 38489 |
Jun2M author:Jun2M |
feat(Topology/Algebra/InfiniteSum): Generalize ENNReal lemmas |
This PR generalizes many theorems in Topology/Algebra/InfiniteSum/ENNReal.lean from `ENNREal` to any type that satisfies a list of order-related instances, mostly
`[CommMonoid α] [CompleteLattice α] [CanonicallyOrderedMul α] [TopologicalSpace α] [SupConvergenceClass α]`
Deprecation of the original `ENNReal` lemmas are done in the next PR: #38193.
Related Zulip thread: [#Is there code for X? > Summing `ENat`s without topology](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Summing.20.60ENat.60s.20without.20topology/with/588756615)
---
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[](https://gitpod.io/from-referrer/)
|
t-topology |
239/5 |
Mathlib/MeasureTheory/Measure/CompleteLattice.lean,Mathlib/MeasureTheory/OuterMeasure/OfFunction.lean,Mathlib/Probability/ProbabilityMassFunction/Monad.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/ENNReal.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean |
6 |
12 |
['Jun2M', 'SnirBroshi', 'github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'wwylele'] |
urkud assignee:urkud |
20-6103 20 days ago |
28-9112 28 days ago |
145-59990 145 days |
1 |
| 39387 |
marcelolynch author:marcelolynch |
feat(Tactic/Linter): add superfluousExpose linter |
Dual of `privateModule`: lints against `@[expose] public section`s where no declaration benefits from exposure, and suggests that you remove the `@[expose]` modifier. Downstream code typechecks the same after the removal.
A section-level `@[expose]` exposes exactly the bodies of the `def` declarations of the section. The linter skips generated declarations (`isAutoDecl`) and counts a constant as one that benefits from exposure when all four conditions hold:
- It is a `def` and its body is exposed (`Environment.hasExposedBody`). This rules out theorems, `opaque` and `partial def`s, private declarations, propositional instances, `@[no_expose]` and `meta` defs, and the parser descriptors of `notation` and `syntax`.
- The declaring command is not an `abbrev`. Lean exposes the body of an `abbrev` by its keyword, not by its reducibility, so a `@[reducible] def` does not qualify.
- It is not an instance (`isInstanceCore`) that an `instance`, `deriving instance`, `inductive`, `class inductive`, or `structure` command declared. An `@[instance] def` therefore keeps the rules of a `def`.
- It is not a structure projection.
Lean exposes the bodies in the last three cases in every public section, with or without the modifier. The linter reads the command kind through `set_option … in` and `open … in` wrappers; a `mutual` block or a macro gets no exemption. Every other exposed `def` counts as one that benefits, so the linter stays silent when in doubt and a reported section is safe to change.
The linter is a stateful linter (leanprover/lean4#14357). It tracks the regions where the scope is public and carries `expose`, and it classifies the constants of each command while the scopes of that command are active. Each expose section gets its own verdict, `scoped` and `local` instances classify correctly, and the warning points at the section header.
The known limitations are false negatives only, and the module docstring lists them. The main case is a hand-written meta-code def, such as a `def` of type `Simproc`, which counts as an ordinary def.
Includes test files covering positive and negative cases, one file per case. The first cleanup sweep, #39388, applied an earlier version of these suggestions to 136 files.
Relevant Zulip thread: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Removing.20unnecessary.20.60.40.5Bexpose.5D.60/with/595180230
|
t-linter
LLM-generated
|
906/0 |
Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/SuperfluousExpose.lean,MathlibTest/Linter/SuperfluousExpose.lean,MathlibTest/Linter/SuperfluousExpose/Negative_DerivingDecidableEq.lean,MathlibTest/Linter/SuperfluousExpose/Negative_ExposeOnNonPublicSection.lean,MathlibTest/Linter/SuperfluousExpose/Negative_InstanceAttrDef.lean,MathlibTest/Linter/SuperfluousExpose/Negative_IrreducibleDef.lean,MathlibTest/Linter/SuperfluousExpose/Negative_NoExposeSection.lean,MathlibTest/Linter/SuperfluousExpose/Negative_PlainDef.lean,MathlibTest/Linter/SuperfluousExpose/Negative_ReducibleDef.lean,MathlibTest/Linter/SuperfluousExpose/Negative_ToAdditive.lean,MathlibTest/Linter/SuperfluousExpose/Negative_UnsafeDef.lean,MathlibTest/Linter/SuperfluousExpose/Positive_AbbrevOnly.lean,MathlibTest/Linter/SuperfluousExpose/Positive_ClassOnly.lean,MathlibTest/Linter/SuperfluousExpose/Positive_FileEndClose.lean,MathlibTest/Linter/SuperfluousExpose/Positive_Inductive.lean,MathlibTest/Linter/SuperfluousExpose/Positive_MultiSection.lean,MathlibTest/Linter/SuperfluousExpose/Positive_NestedExposeSection.lean,MathlibTest/Linter/SuperfluousExpose/Positive_NoExposeDef.lean,MathlibTest/Linter/SuperfluousExpose/Positive_Notation.lean,MathlibTest/Linter/SuperfluousExpose/Positive_PartialDef.lean,MathlibTest/Linter/SuperfluousExpose/Positive_ScopedLocalInstance.lean,MathlibTest/Linter/SuperfluousExpose/Positive_Structure.lean,MathlibTest/Linter/SuperfluousExpose/Positive_TheoremOnly.lean |
25 |
6 |
['eric-wieser', 'github-actions', 'joneugster', 'marcelolynch', 'ocfnash'] |
JovanGerb assignee:JovanGerb |
20-6099 20 days ago |
32-39293 32 days ago |
65-44168 65 days |
0 |
| 41258 |
ungatz author:ungatz |
feat(Analysis/Fourier/FiniteAbelian): add the Donoho-Stark support uncertainty principle |
This adds the Donoho–Stark support uncertainty inequality for the unitary Fourier transform on a finite abelian group, plus the supporting Fourier-inversion machinery indexed by the Pontryagin dual `AddChar G ℂ`.
The headline:
> **Theorem `AddChar.donoho_stark`.** For nonzero `f : G → ℂ`,
> `Fintype.card G ≤ (support f).ncard * (support (fourierTransform f)).ncard`,
> where `fourierTransform f ψ = |G|^(-1/2) * ∑ g, conj (ψ g) * f g` ranges over `ψ : AddChar G ℂ`.
The proof is the elementary (L¹, L∞) duality argument that any harmonic-analysis textbook gives for the classical `ZMod N` case; no Parseval or Cauchy–Schwarz is needed. The finite-abelian generalisation is folklore (stated in Tao–Vu *Additive Combinatorics* and Terras *Fourier Analysis on Finite Groups*); I did not find it formalised in Mathlib or any other major library.
### Why this belongs in Mathlib
Mathlib already has the supporting infrastructure — character theory of finite abelian groups (`Mathlib.Algebra.Group.AddChar`), character orthogonality and Pontryagin duality (`Mathlib.Analysis.Fourier.FiniteAbelian.{Orthogonality, PontryaginDuality}`). The Donoho–Stark inequality is the canonical application of all three, and its absence is a real gap: I needed it for a downstream operator-uncertainty result (a diagonal-operator `rank * Pauli-support` bound on the finite Heisenberg group reduces to it) and ended up proving it from scratch. Beyond that use, it is a standard tool in compressed sensing on finite abelian groups, additive combinatorics, and discrete signal recovery (the 1989 paper has ~3500 citations).
### What's in this PR
A single new file, `Mathlib/Analysis/Fourier/FiniteAbelian/DonohoStark.lean`:
- `AddChar.fourierTransform` — the unitary (symmetric) Fourier transform indexed by `AddChar G ℂ`;
- `AddChar.fourier_inversion` — the inversion formula;
- `AddChar.norm_fourierTransform_le`, `AddChar.norm_le_sum_norm_fourierTransform` — the two `L∞ ≤ |G|^(-1/2) · L¹` triangle bounds;
- `AddChar.donoho_stark` — the support uncertainty inequality.
Design choices I expect questions on, and my defaults:
- **`ℂ` rather than `RCLike`**: matches the cited literature and the cleanest home of `AddChar.norm_apply`; happy to generalise if preferred.
- **`Set.ncard` for support sizes**: avoids needing `DecidableEq ℂ` in the statement.
- **A new sibling file** of `Orthogonality.lean` / `PontryaginDuality.lean` rather than a subsection: orthogonality is the tool, Donoho–Stark is the application; can inline if preferred.
Deliberately *not* included: the diagonal-operator `rank * Pauli-support ≥ 2^n` corollary from my workspace — the Pauli-word machinery has no natural home in `Analysis/Fourier` yet; happy to factor it into a follow-up if there is interest.
### AI usage disclosure
Per the [AI contribution policy](https://leanprover-community.github.io/contribute/index.html): the original Lean proof was generated by **Aristotle** (Harmonic AI's automated proof system) from a dispatch containing the statement and the (L¹, L∞) proof strategy, as part of my PhD research workspace. I audited the delivery line by line against Donoho–Stark 1989 (the dispatch also produced a kernel-checked counterexample to a tempting wrong variant — replacing rank by the count of distinct eigenvalues — which the 2×2 identity falsifies). The file here is my adaptation to Mathlib conventions and to current master (module system, `Set.ncard` statement, robust cast handling in the inversion proof), with final tactic-level repairs done with the assistance of Claude (Anthropic). I understand and can defend every line without AI assistance. Please add the `LLM-generated` label (I cannot set labels myself).
### Test plan
- [x] `lake build Mathlib.Analysis.Fourier.FiniteAbelian.DonohoStark` clean (0 errors, 0 warnings).
- [x] `#print axioms` on all five declarations: `[propext, Classical.choice, Quot.sound]`.
- [x] `lake exe lint-style` clean; all lines ≤ 100 chars.
- [x] `Mathlib.lean` updated in alphabetical position.
- [x] Imports minimal (`PontryaginDuality` + `RCLike.Basic` only).
### Reference
Donoho, D. L. and Stark, P. B. (1989). *Uncertainty principles and signal recovery.* SIAM Journal on Applied Mathematics, **49**(3): 906–931. https://doi.org/10.1137/0149053
---
|
t-analysis
new-contributor
LLM-generated
|
283/0 |
Mathlib.lean,Mathlib/Analysis/Fourier/FiniteAbelian/DonohoStark.lean |
2 |
4 |
['YaelDillies', 'copilot-pull-request-reviewer', 'felixpernegger', 'github-actions'] |
fpvandoorn assignee:fpvandoorn |
20-6093 20 days ago |
107-11780 107 days ago |
107-11773 107 days |
0 |
| 37456 |
Robertboy18 author:Robertboy18 |
feat(LinearAlgebra/AffineSpace): add parallel form of Desargues's theorem |
This PR adds an affine parallel form of the Desargues theorem, following the related Rocq/Coq affine-geometry statement.
**Main changes**
- New file `Mathlib/LinearAlgebra/AffineSpace/Desargues.lean` with `parallel_third_side_of_perspective`.
- Add the corresponding `public import` to `Mathlib.lean`.
**Proof idea**
The proof compares side vectors using `exists_eq_smul_of_parallel` for the two given pairs of parallel sides. The shared comparison along `SA` forces the same scalar, which gives parallelism of the third pair of sides.
Tests: `lake build Mathlib.LinearAlgebra.AffineSpace.Desargues`
AI disclosure: GPT-5.2 Pro was used for assistance with web search/background details about the theorem and for finding useful existing Mathlib lemmas. The theorem statement and Lean formalization were written and checked by hand.
---
[](https://gitpod.io/from-referrer/) |
t-algebra
new-contributor
LLM-generated
label:t-algebra$ |
133/0 |
Mathlib.lean,Mathlib/LinearAlgebra/AffineSpace/Desargues.lean |
2 |
22 |
['Robertboy18', 'SnirBroshi', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'wwylele'] |
nobody |
20-5201 20 days ago |
41-36253 41 days ago |
66-58162 66 days |
0 |
| 44217 |
mitchell-horner author:mitchell-horner |
chore(Combinatorics/SimpleGraph): update notation such that `I` is contained `H` is contained in `G` |
Updates the notation in Copy.lean to enforce `I` is contained in `H` is contained in `G`.
---
<!-- Your PR title will become the first line of the commit message.
In this box, the text above the `---` (if not empty) will be appended
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Co-authors in the squash commit are gathered from two sources:
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may create empty commits to indicate co-authorship, using commands like so:
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the commit message (that is, directly before the `---`) using the following format:
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any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
- ...
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- [ ] depends on: #xyz [optional extra text]
-->
I noticed that (1) the variable order of containment was different across this file and (2) the docstrings were incorrect.
This pull request corrects the docstrings and updates the variable order to:
```
(I : SimpleGraph X) ⊑ (H : SimpleGraph W) ⊑ (G : SimpleGraph V)
```
This fixes (2) but I figure the fix for (1) is opinion. I prefer this order (reverse alphabetical for both `G`, `H`, `I` and `V`, `W`, `X`). |
t-combinatorics |
93/93 |
Mathlib/Combinatorics/SimpleGraph/Copy.lean |
1 |
3 |
['Parcly-Taxel', 'SnirBroshi', 'github-actions', 'mitchell-horner'] |
nobody |
19-70677 19 days ago |
21-2194 21 days ago |
21-2187 21 days |
0 |
| 44241 |
thomaskwaring author:thomaskwaring |
feat(Basic/Rel): relation composition preserves unions |
Add the binary counterpart to `SetRel.comp_iUnion` and friends. |
t-data |
6/0 |
Mathlib/Basic/Rel.lean |
1 |
1 |
['github-actions'] |
nobody |
19-57209 19 days ago |
19-59453 19 days ago |
19-59446 19 days |
0 |
| 42072 |
joneugster author:joneugster |
feat(scripts/autolabel): use PR-title to find labels |
If present, use the paths specified in the PR title to determine labels. If this fails, fall back to the existing `git diff` logic.
- further: cleanup to use `githubAnnotation` consistently throughout the script. (the helper itself could be refactored to make some arguments optional, I'd prefer doing that in a follow-up)
---
<!-- Your PR title will become the first line of the commit message.
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For details on the "pull request lifecycle" in mathlib, please see:
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In particular, note that most reviewers will only notice your PR
if it passes the continuous integration checks.
Please ask for help on https://leanprover.zulipchat.com if needed.
When merging, all the commits will be squashed into a single commit
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Co-authors in the squash commit are gathered from two sources:
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one way to add co-authors is to include at least one commit authored by
each co-author among the commits in the pull request. If necessary, you
may create empty commits to indicate co-authorship, using commands like so:
git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
Second, co-authors can also be listed in lines at the very bottom of
the commit message (that is, directly before the `---`) using the following format:
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any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
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- Nat.bit1_add_bit1
- ...
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-->
[](https://gitpod.io/from-referrer/)
|
CI |
48/12 |
.github/workflows/add_label_from_diff.yaml,scripts/autolabel.lean |
2 |
5 |
['SnirBroshi', 'github-actions', 'joneugster', 'mathlib-merge-conflicts'] |
nobody |
19-42911 19 days ago |
19-43811 19 days ago |
34-21673 34 days |
0 |
| 43983 |
JX-Mo author:JX-Mo |
chore(RepresentationTheory/Rep/Res): remove a layer on `Rep.res` |
Define directly `abbrev res (f : H →* G) (A : Rep k G) := of (A.ρ.comp f)` and golf. |
t-algebra label:t-algebra$ |
14/17 |
Mathlib/RepresentationTheory/Coinduced.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Functoriality.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Functoriality.lean,Mathlib/RepresentationTheory/Rep/Res.lean |
4 |
11 |
['JX-Mo', 'Whysoserioushah', 'github-actions', 'leanprover-radar'] |
nobody |
19-41130 19 days ago |
26-51416 26 days ago |
26-71345 26 days |
3 |
| 44001 |
joneugster author:joneugster |
feat(scripts): synchronise WIP label with draft status |
Add script `sync_wip_label.yml` which ensures that the "WIP" label is present if and only if the PR is a draft.
This triggers on both events, label changes and draft status changes and updates the other one accordingly.
- further: some cleanup in `labels_from_comment.yml`. I first thought I had to add a snippet there to update the draft status whenever the "WIP" label was changed through a comment. This is not necessary anymore, but I did leave the cleanup changes in this PR.
---
Things to note:
- if the script applies a change, it immediately retriggers itself, but this time its a no-op
- `gh` vs. `curl`: it seems overall we have been using `curl` more often. However, it is not possible to change the draft status over `curl` using the REST endpoint, thus this PR uses `gh`.
- AI-usage: an interactive chat model has been used to get an initial draft of the YAML file, to explore github API docs, and to do a review of what I've written.
### Documentation
- [pull_request_target](https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax#onpull_requestpull_request_targetbranchesbranches-ignore)
- [actions triggering workflows](https://docs.github.com/en/actions/reference/workflows-and-actions/events-that-trigger-workflows#pull_request_target)
### Testing (does not apply anymore after the first review)
Here is the local testing setup to verify the bash code. PR ##44004 can be used for this.
<details>
Locally with `gh` installed, this can be triggered manually:
Initially, set up the following variables:
```bash
export PR_NUMBER=44004
export REPO=leanprover-community/mathlib4
export CHANGED_LABEL="WIP"
```
`IS_DRAFT` can be updated manually. You might need to do this after each test:
```bash
export IS_DRAFT=$(gh pr view "$PR_NUMBER" --repo "$REPO" --json isDraft --jq '.isDraft')
```
Then choose an action:
```bash
export ACTION=converted_to_draft. # will add WIP
export ACTION=ready_for_review. # will remove WIP
export ACTION=labeled # convert to draft
export ACTION=unlabeled # mark ready for reviewing
```
after that, you can copy the `case` block from this PR into your bash and observe the changes made to #44004
</details>
[](https://gitpod.io/from-referrer/)
|
CI |
48/4 |
.github/workflows/labels_from_comment.yml,.github/workflows/sync_wip_label.yml,docs/workflows.md |
3 |
22 |
['SnirBroshi', 'bryangingechen', 'github-actions', 'joneugster'] |
nobody |
19-35881 19 days ago |
26-42120 26 days ago |
26-42113 26 days |
0 |
| 43153 |
NoahW314 author:NoahW314 |
feat(Data/Finsupp/Basic): range of `equivMapDomain` |
---
<!-- Your PR title will become the first line of the commit message.
In this box, the text above the `---` (if not empty) will be appended
to the commit message, and can be used to give additional context or
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In particular, note that most reviewers will only notice your PR
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Co-authors in the squash commit are gathered from two sources:
First, all authors of commits to this PR branch are included. Thus,
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each co-author among the commits in the pull request. If necessary, you
may create empty commits to indicate co-authorship, using commands like so:
git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
Second, co-authors can also be listed in lines at the very bottom of
the commit message (that is, directly before the `---`) using the following format:
Co-authored-by: Author Name <author@email.com>
If you are moving or deleting declarations, please include these lines
at the bottom of the commit message (before the `---`, and also before
any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
- ...
Any other comments you want to keep out of the PR commit should go
below the `---`, and placed outside this HTML comment, or else they
will be invisible to reviewers.
If this PR depends on other PRs, please list them below this comment,
using the following format:
- [ ] depends on: #abc [optional extra text]
- [ ] depends on: #xyz [optional extra text]
-->
[](https://gitpod.io/from-referrer/)
|
t-data |
9/0 |
Mathlib/Data/Finsupp/Basic.lean |
1 |
3 |
['BoltonBailey', 'NoahW314', 'github-actions'] |
nobody |
19-33005 19 days ago |
20-84436 20 days ago |
40-72740 40 days |
0 |
| 43569 |
kim-em author:kim-em |
refactor(ModuleCat): state pushforward coherence without identifying functor bracketings |
This PR makes the pushforward of (pre)sheaves of modules along the identity functor and along a composition of functors honestly typed. Currently `pushforwardId` takes `𝟙 S` at the type `S ⟶ (𝟭 C).op ⋙ S` and `pushforwardComp` takes `φ ≫ whiskerLeft F.op ψ` at the type `S ⟶ (F ⋙ G).op ⋙ T`, which only elaborate because `Functor.comp`, `Functor.id` and `Functor.op` unfold. The new `pushforwardIdHom` and `pushforwardCompHom` are the unitor and associator composed with `Functor.opId`/`Functor.opComp` (see `pushforwardIdHom_eq` and `pushforwardCompHom_eq`), and the associativity and unitality isomorphisms of pushforward and pullback are transported along the functor associator and unitors through the new `pushforwardCongr₂`/`pullbackCongr₂` (added at the presheaf level, together with `pushforwardCongr`, `pushforwardNatTrans` and `pushforwardNatIso`). The scheme-level pseudofunctor coherence lemmas in `AlgebraicGeometry.Modules.Sheaf` are reproved from these, and `Adjunction.leftAdjointCompIso_trans` is added for that purpose.
It is extracted from Paul Reichert's experiment making `Functor.comp` and `Functor.id` `instance_reducible` (https://github.com/leanprover-community/mathlib4/compare/master...leanprover-community:mathlib4-nightly-testing:datokrat/functorcomp, discussed at https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/backward.2EisDefEq.2ErespectTransparency), and is the (pre)sheaf-of-modules half of https://github.com/leanprover-community/mathlib4/pull/43566; it is independent of that PR.
🤖 Prepared with Claude Code |
tech debt
t-category-theory
|
480/131 |
Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pullback.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PushforwardContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean,Mathlib/AlgebraicGeometry/Modules/Sheaf.lean,Mathlib/CategoryTheory/Adjunction/CompositionIso.lean,Mathlib/Topology/Sheaves/Module.lean |
9 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
18-86371 18 days ago |
19-1110 19 days ago |
37-9772 37 days |
0 |
| 36937 |
Yaohua-Leo author:Yaohua-Leo |
feat(Algebra/Jordan): add first linearization lemmas for IsCommJordan |
[](https://gitpod.io/from-referrer/)
AI assistance disclosure: I used AI assistance for CI/debugging and module-structure fixes in this PR. The mathematical content and main lemmas were written by me, with help from @pelicanhere.
This PR adds a new file `Mathlib/Algebra/Jordan/Linearization.lean` containing linearization lemmas for the commutative Jordan identity.
Main declarations:
* `IsCommJordan.four_nsmul_associator_mul_add`
* `IsCommJordan.associator_mul_add`
These lemmas formalize a first linearization of the commutative Jordan identity using `associator`, following McCrimmon, Proposition 1.8.5.
---
I put these lemmas in a separate file because I expect follow-up linearization lemmas to belong naturally in the same place.
I am also happy to rename declarations or move the file if reviewers would prefer. |
t-algebra
new-contributor
label:t-algebra$ |
152/90 |
Mathlib.lean,Mathlib/Algebra/Jordan/Basic.lean,Mathlib/Algebra/Jordan/Linearization.lean |
3 |
8 |
['Yaohua-Leo', 'github-actions', 'grunweg', 'ocfnash'] |
ocfnash assignee:ocfnash |
18-73642 18 days ago |
19-10416 19 days ago |
32-21219 32 days |
0 |
| 42720 |
justinhalford author:justinhalford |
feat(Order/KrullDimension): level sets of height are antichains |
Adds one lemma to `Mathlib/Order/KrullDimension.lean`, directly after `height_strictMono`:
```lean
lemma isAntichain_lt_height_preimage {n : ℕ∞} (hn : n ≠ ⊤) :
IsAntichain (· < ·) {x : α | height x = n}
```
Elements sharing a common *finite* height are pairwise incomparable — the level sets of `height` are antichains.
### Why
This is the combinatorial content of **Mirsky's theorem**, which partitions a finite-dimensional order into `krullDim + 1` antichains (and is the easy dual of Dilworth's theorem). Neither Mirsky nor Dilworth currently appears in Mathlib — both are on the tracked list in `docs/1000.yaml` without a `decl`, and searching for `Mirsky` and `Dilworth` returns nothing.
Rather than introduce the partition machinery up front, this contributes the underlying fact, which is what any route to Mirsky needs and is independently useful for reasoning about graded and finite-dimensional orders.
### Design
Stated with `(· < ·)` rather than `(· ≤ ·)` so that it lives in the existing `[Preorder α]` section and needs no antisymmetry; in a partial order the two coincide for distinct elements. The hypothesis is `n ≠ ⊤` rather than a finiteness typeclass, which keeps it usable without extra assumptions — `height_strictMono` needs exactly that much.
### Proof
Three lines on `height_strictMono`, immediately above it in the same file.
### Verification
Compiles against `master` with no errors or warnings. `#print axioms` reports only `[propext, Classical.choice, Quot.sound]`. No new imports or definitions — `+11 -0` in one file.
### Disclosure
Written with AI assistance (Claude Opus 5) and checked against the Lean kernel; I have read the statement and proof before submitting. Happy to rename, or to restate as `IsAntichain (· ≤ ·)` in a `PartialOrder` section if that is preferred.
|
t-order
new-contributor
|
11/0 |
Mathlib/Order/KrullDimension.lean |
1 |
5 |
['github-actions', 'theebayuser'] |
nobody |
18-72682 18 days ago |
64-58537 64 days ago |
64-58530 64 days |
0 |
| 44228 |
Nicola9Falciola author:Nicola9Falciola |
feat(LinearAlgebra/Matrix/Transvection): add the api for define the elementary subgroup |
---
This PR adds API for transvections, needed to define the elementary subgroup `E(n, R)` of
`SL(n, R)` in a follow-up PR.
In `Mathlib/LinearAlgebra/Matrix/Transvection.lean`:
- `Matrix.map_transvection`: `(transvection i j c).map f = transvection i j (f c)`
- `Matrix.transvection_mul_transvection_mul_transvection_neg_mul_transvection_neg`:
the explicit formula for writing the commutator of transvections
- `Matrix.TransvectionStruct.reindexEquiv_surjective`
- `Matrix.TransvectionStruct.map`: apply a ring hom to the coefficient, with `map_toMatrix`,
`map_surjective` and `toMatrix_mem_range_map`
In `Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean`:
- `SpecialLinearGroup.sumInl`: the embedding `SL(n, R) →* SL(n ⊕ p, R)`, `A ↦ !![A, 0; 0, 1]`,
with `coe_sumInl`, this will be necessary for induction argument over the index type.
- `SpecialLinearGroup.commutatorElement_transvection`:
`⁅transvection hij a, transvection hjk b⁆ = transvection hik (a * b)`
- `SpecialLinearGroup.map_transvection`
- `TransvectionStruct.map_toSpecialLinearGroup`, `toSpecialLinearGroup_mem_range_map`,
`sumInl_toSpecialLinearGroup`,
`coe_list_prod_toSpecialLinearGroup`, and `mem_range_sumInl_iff`
The surjective and `SpecialLinearGroup.sumInl` API will be needed to simplify the arguments involving
proving `E(n, R) = SL(n, R)` .
<!-- Your PR title will become the first line of the commit message.
In this box, the text above the `---` (if not empty) will be appended
to the commit message, and can be used to give additional context or
details. Please leave a blank newline before the `---`, otherwise GitHub
will format the text above it as a title.
For details on the "pull request lifecycle" in mathlib, please see:
https://leanprover-community.github.io/contribute/index.html
In particular, note that most reviewers will only notice your PR
if it passes the continuous integration checks.
Please ask for help on https://leanprover.zulipchat.com if needed.
When merging, all the commits will be squashed into a single commit
listing all co-authors.
Co-authors in the squash commit are gathered from two sources:
First, all authors of commits to this PR branch are included. Thus,
one way to add co-authors is to include at least one commit authored by
each co-author among the commits in the pull request. If necessary, you
may create empty commits to indicate co-authorship, using commands like so:
git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
Second, co-authors can also be listed in lines at the very bottom of
the commit message (that is, directly before the `---`) using the following format:
Co-authored-by: Author Name <author@email.com>
If you are moving or deleting declarations, please include these lines
at the bottom of the commit message (before the `---`, and also before
any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
- ...
Any other comments you want to keep out of the PR commit should go
below the `---`, and placed outside this HTML comment, or else they
will be invisible to reviewers.
If this PR depends on other PRs, please list them below this comment,
using the following format:
- [ ] depends on: #abc [optional extra text]
- [ ] depends on: #xyz [optional extra text]
-->
|
t-algebra label:t-algebra$ |
116/1 |
Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/Matrix/Transvection.lean |
2 |
2 |
['github-actions'] |
nobody |
18-40715 18 days ago |
18-45195 18 days ago |
20-50260 20 days |
1 |
| 44093 |
grunweg author:grunweg |
chore: fix more congruence lemmas |
A `congr` should vary all its explicit arguments, not just some of them. This issue is documented on the docstring of the `@[congr]` attribute, but there is no warning when you write a bad `@[congr]` lemma.
Whenever a lemma seemed used sufficiently often, we fixed the congruence lemma by adding a new variant, with a primed name and the additional arguments varied also.
Found by the linter in #43692; these should be all remaining bad lemmas in mathlib.
---
<!-- Your PR title will become the first line of the commit message.
In this box, the text above the `---` (if not empty) will be appended
to the commit message, and can be used to give additional context or
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|
t-algebra
tech debt
label:t-algebra$ |
74/38 |
Mathlib/Algebra/MonoidAlgebra/Module.lean,Mathlib/Data/Finset/Filter.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Find.lean,Mathlib/Data/List/Zip.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Filter.lean,Mathlib/Data/Multiset/Find.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/NAry.lean,Mathlib/Data/Sym/Basic.lean,Mathlib/Data/Sym/Card.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/Geometry/Convex/ConvexSpace/Defs.lean,Mathlib/LinearAlgebra/Finsupp/Supported.lean,Mathlib/LinearAlgebra/QuadraticForm/Signature.lean |
18 |
5 |
['github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts'] |
nobody |
18-39296 18 days ago |
18-45317 18 days ago |
21-40866 21 days |
0 |
| 41478 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/Paths): more length upper bounds |
Bound the lengths of trails/paths/circuits/cycles by `ENat.card V`/`Nat.card V`/`G.edgeSet.encard`/`G.edgeSet.ncard`.
---
I then used these to slightly golf some other lemmas.
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics |
38/28 |
Mathlib/Combinatorics/SimpleGraph/Paths.lean |
1 |
3 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
18-37804 18 days ago |
18-38926 18 days ago |
63-18608 63 days |
0 |
| 41260 |
SnirBroshi author:SnirBroshi |
feat(GroupTheory/Exponent): the order of a group divides a power of its exponent |
For finite groups:
- `(Monoid.exponent G).primeFactors = (Nat.card G).primeFactors`
- `Nat.card G ∣ Monoid.exponent G ^ Nat.card G`
---
This requires importing Cauchy's theorem (`GroupTheory.Perm.Cycle.Type`) in `Exponent.lean` which I'm not sure about, but the alternatives are either moving the theorems to `PGroup.lean`, or creating a new file with a strange name like `ExponentLemmas.lean`.
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[](https://gitpod.io/from-referrer/)
|
t-group-theory
large-import
|
27/3 |
Mathlib/GroupTheory/Exponent.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean |
2 |
14 |
['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'ocfnash', 'tb65536'] |
riccardobrasca assignee:riccardobrasca |
18-35994 18 days ago |
18-37907 18 days ago |
106-21395 106 days |
0 |
| 44294 |
harahu author:harahu |
doc(RepresentationTheory): add module doc headers for Action and Equiv |
Add H1 module doc headers for `Mathlib/RepresentationTheory/Action.lean` and `Mathlib/RepresentationTheory/Equiv.lean`.
Split out from #42795 to allow the mechanical header cleanups to be merged separately.
---
[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
5/1 |
Mathlib/RepresentationTheory/Action.lean,Mathlib/RepresentationTheory/Equiv.lean |
2 |
1 |
['github-actions'] |
nobody |
18-33152 18 days ago |
18-33957 18 days ago |
18-33950 18 days |
0 |
| 37298 |
artie2000 author:artie2000 |
refactor(Algebra/Order): unbundle group and ring cone |
* Unbundle `GroupCone` and `RingCone` using `Submonoid.IsMulPointed`
This PR deprecates the [GroupCone](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Group/Cone.html#GroupCone) and [RingCone](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Ring/Cone.html#RingCone) structures, making use of the predicates `Submonoid.IsMulPointed` and `AddSubmonoid.IsPointed` defined in that file instead.
These predicates allow us to treat uniformly
* positive cones in groups and rings
* pointed cones in vector spaces over an ordered field
* orderings in rings
This reduces duplication of theorems.
Unbundling group and ring cones is further justified by the principle that there are no new operations on them: they correspond to operations on the underlying submonoids and subsemirings, respectively. See the discussion at https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/When.20should.20subobjects.20be.20bundled.3F/with/609099816
See also #36863 for the analogous change to ring orderings.
---
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|
t-algebra
large-import
increases-technical-debt
maintainer-merge
label:t-algebra$ |
127/29 |
Mathlib/Algebra/Group/Submonoid/Support.lean,Mathlib/Algebra/Order/Group/Cone.lean,Mathlib/Algebra/Order/Ring/Cone.lean |
3 |
37 |
['Vierkantor', 'YaelDillies', 'artie2000', 'github-actions', 'joneugster', 'mathlib-merge-conflicts'] |
nobody |
18-33148 18 days ago |
18-34512 18 days ago |
80-53380 80 days |
1 |
| 43528 |
joelriou author:joelriou |
feat(Geometry/Convex): the simplicial set of affine simplices of a convex space |
Let `Y` be a `R`-convex space. In this file, we introduce the simplicial set `toSSet R Y` whose `n`-simplices are affine maps from the standard `n`-dimensional simplex to `Y`. (When `R := ℝ` and `Y` has a suitable topology, this identifies to a subcomplex of the singular simplicial set of the topological space `Y`.)
From https://github.com/joelriou/excision
---
- [x] depends on: #43524
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|
t-convex-geometry |
188/0 |
Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/Geometry/Convex/ConvexSpace/ToSSet.lean |
3 |
2 |
['github-actions', 'mathlib-dependent-issues'] |
nobody |
18-30986 18 days ago |
29-49841 29 days ago |
29-50750 29 days |
0 |
| 42874 |
teorth author:teorth |
feat(RingTheory/MvPolynomial/Symmetric): basic API lemmas for Multiset.esymm |
Add basic lemmas for the elementary symmetric functions `Multiset.esymm`: `esymm_cons`, `esymm_zero`, `esymm_one`, `esymm_card`, `esymm_eq_zero_of_card_lt`, `two_mul_esymm_two`, and `esymm_map_inv` (with a private auxiliary). Also drop the redundant `@[simp]` on `esymm_pair_one`, which is now provable by `simp` from `esymm_one`.
---
The code here was prepared with AI assistance, but then golfed and reviewed by myself. It will be used in a forthcoming PR on the Newton and Maclaurin inequalities.
[](https://gitpod.io/from-referrer/)
|
t-ring-theory |
32/0 |
Mathlib/RingTheory/MvPolynomial/Symmetric/Defs.lean |
1 |
8 |
['felixpernegger', 'github-actions', 'teorth', 'vlad902'] |
nobody |
18-9158 18 days ago |
18-10352 18 days ago |
19-14067 19 days |
1 |
| 41327 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/Subgraph): `induce` lemmas |
`Subgraph.induce` API for sup / inf / iSup / iInf / inter / iUnion / iInter (union already exists)
---
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|
t-combinatorics |
58/0 |
Mathlib/Combinatorics/SimpleGraph/Subgraph.lean |
1 |
1 |
['github-actions'] |
b-mehta assignee:b-mehta |
18-6102 18 days ago |
105-40168 105 days ago |
105-40161 105 days |
0 |
| 43440 |
Raph-DG author:Raph-DG |
feat(AlgebraicGeometry): serre's R_k condition for schemes |
In this PR, we define Serre's R_k condition. We also show that R_1 is equivalent to all local rings in codimension one being DVRs, though we show this under the assumption that the local rings are all domains. This assumption can be dropped once #28683 is merged.
AI disclosure: assisted by claude opus 5
---
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|
t-algebraic-geometry |
104/0 |
Mathlib.lean,Mathlib/AlgebraicGeometry/RegularInCodimension.lean |
2 |
14 |
['Brian-Nugent', 'Raph-DG', 'github-actions', 'justus-springer'] |
mattrobball assignee:mattrobball |
18-6097 18 days ago |
32-17179 32 days ago |
41-86379 41 days |
0 |
| 43250 |
WenrongZou author:WenrongZou |
chore(Valuation/Integers): rename `Valuation.Integers` to `Valuation.IsIntegers` |
I think [`Valuation.Integers`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Valuation/Integers.html#Valuation.Integers) is the characteristic predicate. If this is not what we want, I am happy to add a characteristic predicate in this file.
---
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|
t-ring-theory |
193/61 |
Mathlib/NumberTheory/Padics/Complex.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Valuation/Archimedean.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/RingTheory/Valuation/Discrete/IsDiscreteValuationRing.lean,Mathlib/RingTheory/Valuation/Integers.lean,Mathlib/RingTheory/Valuation/Integral.lean,Mathlib/RingTheory/Valuation/ValuationRing.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean |
12 |
19 |
['WenrongZou', 'b-mehta', 'github-actions', 'jcommelin', 'mathlib-bors', 'riccardobrasca'] |
nobody |
17-59830 17 days ago |
17-59830 17 days ago |
32-81767 32 days |
0 |
| 43578 |
WilliamCoram author:WilliamCoram |
feat: identifying WithZero (Multiplicative M) and WithTop M |
We identify `Mᵐ⁰ = WithZero (Multiplicative M)` with `WithTop M` in the form of an order-and-additive isomorphism.
In future work this will allow us to define additive valuations from valuations with a usable target (specifically attaching to a rank one discrete valuation an additive valuation into WithTop Z).
AI usage:
The need of attaching additive valuations to valuations came up in my Newton polygon work - after some discussion with people and Claude this was the approach I felt worked best for me. The file was drafted and written by Claude with my input and cleaning.
---
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|
LLM-generated
t-algebra
label:t-algebra$ |
142/0 |
Mathlib.lean,Mathlib/Algebra/Order/GroupWithZero/NegLog.lean |
2 |
3 |
['Multramate', 'github-actions'] |
nobody |
17-35712 17 days ago |
38-43925 38 days ago |
38-44157 38 days |
1 |
| 33864 |
Timeroot author:Timeroot |
feat(Computability/Primrec): Proving several Nat arithmetic functions are primrec |
Prove that gcd, lcm, coprimality, divisiblity, primality, factorial, descending factorial, powers, and various logarithms are all primitive recursive.
Co-authored-by: Aristotle Harmonic <[aristotle-harmonic@harmonic.fun](mailto:aristotle-harmonic@harmonic.fun)>
|
large-import
t-computability
|
195/3 |
Mathlib.lean,Mathlib/Computability/Primrec/List.lean,Mathlib/Computability/Primrec/Nat.lean,Mathlib/Data/Nat/Log.lean |
4 |
9 |
['eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot'] |
nobody |
17-30103 17 days ago |
17-32025 17 days ago |
111-20156 111 days |
0 |
| 44297 |
langston-barrett author:langston-barrett |
feat(Data/FinEnum): `Std.PRange.LawfulUpwardEnumerable` instance |
---
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I'm not sure how Mathlib feels about interfacing with std constructs, but I was looking for something along the lines of `succMany?` and found `Std.PRange.LawfulUpwardEnumerable`, so I figured I'd implement it and see what the appetite is. Even if we don't decide to use this particular typeclass, the underlying functionality still seems useful.
This is my first ever Lean development, so I would greatly appreciate any tips and feedback on the style!
I wrote all of this by hand, though I asked some questions about Lean to GPT 5.6 Luna along the way.
A `LinearlyUpwardEnumerable` instance would be a good follow-up. |
t-data
new-contributor
|
112/0 |
Mathlib/Data/FinEnum.lean |
1 |
3 |
['github-actions', 'langston-barrett'] |
nobody |
17-20427 17 days ago |
17-29720 17 days ago |
17-37471 17 days |
0 |
| 44328 |
Multramate author:Multramate |
chore: fix misspelling `supsets` in `Set.sUnion_mono_supsets` |
Fixes the misspelling `supsets` in `Set.sUnion_mono_supsets`.
---
🤖 Generated with [Claude Code](https://claude.com/claude-code) |
t-data
LLM-generated
|
3/1 |
Mathlib/Data/Set/Lattice/Bounded.lean |
1 |
5 |
['JX-Mo', 'Multramate', 'github-actions'] |
nobody |
17-17474 17 days ago |
17-27512 17 days ago |
17-27505 17 days |
0 |
| 41432 |
SnirBroshi author:SnirBroshi |
chore(Combinatorics/SimpleGraph/Paths): spell `getVert` injectivity lemmas using `Set` intervals |
e.g. replace `{i | i ≤ p.length}` with `Iic p.length` in `IsPath.getVert_injOn`, which is the canonical spelling.
Proofs using `Set.mem_setOf`/`Set.mem_setOf_eq` had to be fixed, and got golfed along the way.
I also rewrote the proof of `IsPath.getVert_injOn` since it seemed too long.
---
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|
t-combinatorics |
29/60 |
Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean |
2 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
17-14336 17 days ago |
90-37032 90 days ago |
101-67487 101 days |
1 |
| 36086 |
Multramate author:Multramate |
feat(Algebra): add liftEquiv for groups, rings, algebras, and adjoin roots |
---
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|
t-algebra label:t-algebra$ |
49/1 |
Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean |
4 |
10 |
['CBirkbeck', 'Multramate', 'artie2000', 'dagurtomas', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
17-11775 17 days ago |
30-36021 30 days ago |
45-54034 45 days |
1 |
| 41336 |
SnirBroshi author:SnirBroshi |
chore(Combinatorics/SimpleGraph/Girth): golf `egirth_top` using `cycleGraph` |
Golf `egirth_top` (#38529) using `cycleGraph_isContained_iff` (#35255)
Co-authored-by: Vlad Tsyrklevich <vlad@tsyrklevi.ch>
---
Speeds up the proof from ~120ms to ~30ms
(although it used to be ~600ms, not sure what happened, perhaps toolchains sped it up already)
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|
t-combinatorics |
5/11 |
Mathlib/Combinatorics/SimpleGraph/Girth.lean |
1 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
b-mehta assignee:b-mehta |
17-10445 17 days ago |
31-84500 31 days ago |
105-7108 105 days |
0 |
| 44288 |
artie2000 author:artie2000 |
feat(Algebra/Ring): sums of squares in a formally real ring form a positive cone |
* Prove that sums of squares in a formally real ring form a positive cone
* Add helper lemma relating the additive submonoid and subsemiring of sums of squares
---
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|
t-algebra label:t-algebra$ |
15/2 |
Mathlib/Algebra/Ring/IsFormallyReal.lean,Mathlib/Algebra/Ring/SumsOfSquares.lean |
2 |
1 |
['github-actions', 'vihdzp'] |
nobody |
17-6260 17 days ago |
18-42343 18 days ago |
18-42336 18 days |
0 |
| 42895 |
cameronfreer author:cameronfreer |
feat(SetTheory/Ordinal): add lift_sSup and lift_iSup |
Add `InitialSeg.map_sSup` and `InitialSeg.map_iSup` for conditionally complete linear orders with bottom. Specializing these to `Ordinal.liftInitialSeg` gives `Ordinal.lift_sSup`, `Ordinal.lift_iSup`, `Ordinal.lift_iSup_le`, and `Ordinal.lift_iSup_le_iff`.
The `sSup` theorem handles the empty set using preservation of bottom and the nonempty case using normality. The `iSup` theorem is derived from it. Both use an explicit boundedness hypothesis; in particular, `lift_iSup` assumes `BddAbove (Set.range f)` rather than requiring the index type to be small.
🤖 This PR was developed with assistance from Claude and GPT models, using [lean4-skills](https://github.com/cameronfreer/lean4-skills) and [lean-lsp-mcp](https://github.com/oOo0oOo/lean-lsp-mcp).
|
t-set-theory
new-contributor
LLM-generated
|
40/0 |
Mathlib/Order/IsNormal.lean,Mathlib/SetTheory/Ordinal/Family.lean |
2 |
11 |
['cameronfreer', 'github-actions', 'plp127', 'vihdzp'] |
nobody |
17-5198 17 days ago |
59-49669 59 days ago |
59-50616 59 days |
0 |
| 44216 |
peabrainiac author:peabrainiac |
feat(Topology): add `IsCozeroSet` |
Define a predicate `IsCozeroSet` for sets in topological spaces that are the support of some continuous function to $\mathbb R$. We prove:
* Every cozero set is open, and in perfectly normal spaces every open set is a cozero set.
* Finite intersections and locally finite unions of cozero sets are cozero sets.
* Preimages of cozero sets under continuous functions are cozero sets.
* Images and coimages of cozero sets under open proper maps are cozero sets.
---
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Taken from [classifying-bundles](https://peabrainiac.github.io/classifying-bundles/docs/ClassifyingBundles/IsCozeroSet), where this API was useful for working with numerable covers. |
t-topology |
227/0 |
Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/Order/Group/Indicator.lean,Mathlib/Topology/IsCozeroSet.lean |
4 |
1 |
['github-actions'] |
nobody |
17-3695 17 days ago |
21-5447 21 days ago |
21-6694 21 days |
0 |
| 41940 |
mcdoll author:mcdoll |
chore(Dynamics): deprecate `IsForwardInvariant` in favour of new `Set.IsInvariantOn` |
We define a predicate `Set.IsInvariantOn` that generalizes `IsInvariant` and as a special case contains `IsForwardInvariant`. The later is hence removed. We also move `IsInvariant` into the `Set` namespace to allow for dot-notation.
---
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|
t-dynamics
dynsys
|
51/17 |
Mathlib/Dynamics/Flow.lean,Mathlib/Dynamics/OmegaLimit.lean |
2 |
5 |
['github-actions', 'mathlib-merge-conflicts', 'mcdoll', 'sgouezel'] |
sgouezel assignee:sgouezel |
17-3360 17 days ago |
17-4077 17 days ago |
71-8262 71 days |
0 |
| 42025 |
NoneMore author:NoneMore |
feat(ModelTheory): add counting formulas |
Add formula constructors expressing at least, at most, and exactly finitely many realizations, together with their semantic characterizations.
---
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- [ ] depends on: #42024
AI disclosure: I used Codex to generate the Lean declarations and documentation in this PR.
[](https://gitpod.io/from-referrer/)
|
large-import
t-logic
|
124/0 |
Mathlib/Data/Set/Card.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean |
3 |
4 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
17-2355 17 days ago |
17-2357 17 days ago |
17-4883 17 days |
2 |
| 44310 |
artie2000 author:artie2000 |
feat(FieldTheory): field with no nontrivial extensions is algebraically closed |
---
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|
t-algebra label:t-algebra$ |
13/0 |
Mathlib/FieldTheory/IsAlgClosed/Basic.lean |
1 |
3 |
['JX-Mo', 'github-actions'] |
nobody |
16-82863 16 days ago |
16-84448 16 days ago |
18-161 18 days |
0 |
| 44334 |
JovanGerb author:JovanGerb |
feat: `@[gcongr]` for `eq_top_mono` and friends |
This PR tags lemma `eq_top_mono` and various similar lemmas with `@[gcongr]`. This lets us use `grw` in places where we couldn't before. The supported maximal/minimal constants are `⊤`, `⊥`, `(∅ : Set _)`, `Set.univ`, `0`, `1`, each on either side of an equality `=` and an inequality `≠`.
`subset_eq_empty` is renamed to `eq_empty_of_subset`, to match `eq_univ_of_subset`.
Performance note: `@[gcongr]` lemmas are indexed only by the relation and head constand, which for these lemmas is `=` and `→`, or `≠` and `→`. So, it will need to try all 12 available lemmas in these cases. I do not think that this will cause any noticeable performance issue. If it does, we can consider a more detailed indexing of `@[gcongr]` lemmas.
---
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|
64/16 |
Mathlib/Algebra/Order/IsBotOne.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Lattice/Bounded.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/SetDissipate.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/Compactness/Lindelof.lean,Mathlib/Topology/MetricSpace/Thickening.lean,Mathlib/Topology/Separation/Regular.lean,MathlibTest/Tactic/GRewrite.lean |
10 |
1 |
['github-actions'] |
nobody |
16-77520 16 days ago |
17-10391 17 days ago |
17-13558 17 days |
1 |
| 41666 |
alreadydone author:alreadydone |
feat(Order): constructors for DistribLattice and IsModularLattice |
Add three constructors for DistribLattice and one for IsModularLattice.
Co-authored-by: Aaron Liu @plp127
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|
t-order |
189/98 |
Mathlib.lean,Mathlib/Order/Defs/Lattice.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/Lattice/Constructor.lean,Mathlib/Order/ModularLattice.lean |
5 |
13 |
['SnirBroshi', 'alreadydone', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'plp127'] |
nobody |
16-65376 16 days ago |
16-70492 16 days ago |
80-80578 80 days |
1 |
| 44350 |
tb65536 author:tb65536 |
feat(Data/Finset/Lattice/Fold): general `Finset.map_sup` lemmas |
I found these more general `map_sup` lemmas to be helpful in #42985.
---
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|
t-order
t-data
|
14/4 |
Mathlib/Data/Finset/Lattice/Fold.lean |
1 |
1 |
['github-actions'] |
nobody |
16-54905 16 days ago |
16-54973 16 days ago |
16-54967 16 days |
1 |
| 43372 |
plp127 author:plp127 |
chore: deprecate monad operations on `MvPolynomial` |
Deprecate some monad operations on `MvPolynomial`, as they are simply special cases of existing `eval` operations and it's not clear from the name what the signatures of these operations are.
---
- [x] depends on: #43371
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|
t-algebra label:t-algebra$ |
377/255 |
Mathlib/Algebra/Module/LinearMap/Polynomial.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/MvPolynomial/Expand.lean,Mathlib/Algebra/MvPolynomial/Monad.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/RingTheory/AlgebraicIndependent/Basic.lean,Mathlib/RingTheory/NoetherNormalization.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/RingTheory/WittVector/Defs.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/InitTail.lean,Mathlib/RingTheory/WittVector/IsPoly.lean,Mathlib/RingTheory/WittVector/MulCoeff.lean,Mathlib/RingTheory/WittVector/MulP.lean,Mathlib/RingTheory/WittVector/StructurePolynomial.lean,Mathlib/RingTheory/WittVector/Verschiebung.lean,Mathlib/RingTheory/WittVector/WittPolynomial.lean |
17 |
3 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
16-52572 16 days ago |
17-55700 17 days ago |
34-25139 34 days |
0 |
| 44354 |
Rob23oba author:Rob23oba |
fix: use a more robust definition for unquot |
`unsafeCast`, and by extension, `cast lcProof`, is quite unstable in the compiler. Instead using an unsound `Quot.lift` is much more stable, since it uses the intended features for `Quot` and translates into an explicit `Quot.lcInv` application in the compiler. You can however not just use `Quot.lcInv` as the definition because the computability check catches it as an application of an axiom.
See also leanprover/lean4#14719 for an issue with the `unsafeCast` definition of `unquot`.
|
t-data |
1/1 |
Mathlib/Data/Quot.lean |
1 |
1 |
['github-actions'] |
nobody |
16-47823 16 days ago |
16-51889 16 days ago |
16-51882 16 days |
0 |
| 44123 |
TJHeeringa author:TJHeeringa |
feat(LinearAlgebra/SesquilinearForm/Basic): generalize LinearMap.Nondegenerate |
The implemented definition `LinearMap.Nondegenerate` required `CommSemirings`. This is a stronger requirement than necessary. This PR relaxes the conditions on `LinearMap.Nondegenerate` to the minimal ones, i.e. the same as needed to define a bilinear map.
---
This is needed to generalize the RKHS from `InnerProductSpace/Reproducing.lean`.
**AI**:
After generalizing, the statement of the theorem `SeparatingLeft.id` broke. I asked Claude Sonnet 5 free for a fix. It suggested to just make the range and domain of the mapping `LinearMap.id` explicit. Predictable, but I didn't see a better solution.
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|
t-algebra label:t-algebra$ |
33/28 |
Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean |
3 |
5 |
['TJHeeringa', 'github-actions', 'themathqueen'] |
nobody |
16-47614 16 days ago |
23-47678 23 days ago |
23-47671 23 days |
0 |
| 43852 |
ZRTMRH author:ZRTMRH |
feat(Combinatorics/Quiver/Schreier): add Schreier Cayley basics |
Defined Cayley graph as a coset Schreier graph. Proved connectivity and vertex-transitivity on Cayley graphs, as promised in #38310.
Follow-up to #38310, this is the 3rd split pr from #35467.
This PR was written with AI assistance (Claude). The code has been reviewed by the author.
P.S. cayley_subsingleton_weaklyConnectedComponent's proof is generic and I can extract it to Quiver/ConnectedComponent.lean as a weak-connectivity lemma, if it is wanted.
---
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|
new-contributor
t-combinatorics
large-import
LLM-generated
|
278/7 |
Mathlib/Combinatorics/Quiver/Schreier.lean |
1 |
10 |
['SnirBroshi', 'ZRTMRH', 'github-actions', 'mathlib-merge-conflicts', 'vlad902'] |
nobody |
16-42539 16 days ago |
18-45440 18 days ago |
31-8248 31 days |
0 |
| 43362 |
TJHeeringa author:TJHeeringa |
feat(Analysis/InnerProductSpace/Reproducing): add RKHS.SMul.smulSpace |
This PR defines the scalar multiple `c • H` for a given RKHS `H` and shows that it is an RKHS.
---
Can be constructed just as the sumSpace in #41127. However, the discussion below concluded that the current type copy approach was better in this case.
The notation `scoped infix:50 " • " => smulSpace` was not introduced. That caused overload issues that I don't know how to fix.
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|
t-analysis |
119/5 |
Mathlib/Analysis/InnerProductSpace/Reproducing.lean,Mathlib/Analysis/InnerProductSpace/Reproducing/Operations.lean |
2 |
9 |
['Maldooor', 'TJHeeringa', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
16-38290 16 days ago |
16-39365 16 days ago |
16-40409 16 days |
1 |
| 36814 |
YaelDillies author:YaelDillies |
refactor(Combinatorics/SimpleGraph): no proof obligation in `rotate` |
If the walk doesn't go through the new vertex, return `nil` instead.
---
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t-combinatorics |
44/32 |
Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean |
7 |
19 |
['SnirBroshi', 'YaelDillies', 'b-mehta', 'bryangingechen', 'eric-wieser', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib-merge-conflicts'] |
nobody |
16-32591 16 days ago |
16-33225 16 days ago |
191-54949 191 days |
0 |
| 44351 |
homeowmorphism author:homeowmorphism |
chore(Topology/MetricSpace/Bounded): add grind annotations to lemmas about the diameter |
---
I was browsing this API in the light of #43723 and noticed these possible improvements.
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|
t-topology |
6/3 |
Mathlib/Topology/MetricSpace/Bounded.lean |
1 |
3 |
['github-actions', 'homeowmorphism'] |
nobody |
16-15063 16 days ago |
16-38115 16 days ago |
16-41234 16 days |
0 |
| 41816 |
tb65536 author:tb65536 |
feat(GroupTheory/PGroup): add exponent characterization |
This PR adds the exponent characterization of p-groups, and uses it to golf the existing proof of `isPGroup_iff_card_dvd_pow`.
---
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|
t-group-theory
large-import
|
41/40 |
Mathlib/GroupTheory/Exponent.lean,Mathlib/GroupTheory/PGroup.lean |
2 |
3 |
['SnirBroshi', 'github-actions', 'tb65536'] |
nobody |
16-5198 16 days ago |
72-66023 72 days ago |
72-67199 72 days |
0 |
| 41393 |
SnirBroshi author:SnirBroshi |
feat(SimpleGraph/Hamiltonian): a graph is Hamiltonian iff there's a Hamiltonian path with adjacent endpoints |
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics |
32/9 |
Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean |
1 |
4 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
16-2134 16 days ago |
16-6479 16 days ago |
95-83103 95 days |
2 |
| 44145 |
Rida-Hamadani author:Rida-Hamadani |
feat(Analysis): translations preserve harmonicity |
also proves that translations preserves `C^n` regularity.
---
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|
t-analysis |
63/0 |
Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/InnerProductSpace/Harmonic/Basic.lean,Mathlib/Analysis/InnerProductSpace/Laplacian.lean |
3 |
1 |
['github-actions'] |
nobody |
15-50001 15 days ago |
23-14592 23 days ago |
23-14585 23 days |
0 |
| 43695 |
gasparattila author:gasparattila |
feat(Topology/Algebra): define a topology on `Homogenization` |
---
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[](https://gitpod.io/from-referrer/)
|
t-topology |
377/0 |
Mathlib.lean,Mathlib/Topology/Algebra/Homogenization.lean |
2 |
2 |
['github-actions', 'mathlib-dependent-issues'] |
nobody |
15-41861 15 days ago |
16-22636 16 days ago |
16-22714 16 days |
0 |
| 43545 |
gasparattila author:gasparattila |
refactor(Algebra/Order/Ring/Idempotent): introduce bundled types |
This file currently has several instances defined for specific subtypes. This PR replaces these with bundled structures. This also fixes possible typeclass diamonds when the order defined here conflicts with the general one on subtypes.
---
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory |
242/111 |
Mathlib/Algebra/Order/Ring/Idempotent.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean |
2 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
15-40338 15 days ago |
15-41432 15 days ago |
39-33823 39 days |
0 |
| 42919 |
tb65536 author:tb65536 |
feat(NumberTheory/RamificationInertia/Unramified): generalize `IsUnramifiedAt.of_liesOver` to flat algebras |
This PR generalizes `IsUnramifiedAt.of_liesOver` to flat algebras and deprecates the technical auxiliary lemma `IsUnramifiedAt.of_liesOver_of_ne_bot` for the previous proof.
This also avoids the usage of the old `Ideal.ramificationIdx'` in the proof of `IsUnramifiedAt.of_liesOver_of_ne_bot`.
---
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory
t-algebra
label:t-algebra$ |
24/6 |
Mathlib/NumberTheory/RamificationInertia/Unramified.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Algebra.lean,Mathlib/RingTheory/Ideal/GoingDown.lean,Mathlib/RingTheory/Unramified/LocalRing.lean |
4 |
1 |
['github-actions'] |
nobody |
15-38503 15 days ago |
59-17607 59 days ago |
59-17602 59 days |
0 |
| 42182 |
gasparattila author:gasparattila |
feat(Order/Partition): converting a `Finpartition` into a `Partition` |
---
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[](https://gitpod.io/from-referrer/)
|
t-order
large-import
|
60/2 |
Mathlib/Order/Partition/Basic.lean,Mathlib/Order/Partition/Finpartition.lean,Mathlib/Order/SupIndep.lean |
3 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
15-34210 15 days ago |
15-36878 15 days ago |
77-9425 77 days |
0 |
| 43409 |
gasparattila author:gasparattila |
doc: expand the documentation on `SMul ℕ` defeq issues |
---
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[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
20/1 |
Mathlib/Algebra/Group/Monoid.lean |
1 |
3 |
['Vierkantor', 'gasparattila', 'github-actions'] |
nobody |
15-28816 15 days ago |
43-36529 43 days ago |
43-36522 43 days |
0 |
| 38587 |
dagurtomas author:dagurtomas |
feat(Tactic/CategoryTheory): concrete category boilerplate |
Adds `mk_concrete_category`, a command for generating the initial boilerplate for concrete categories whose morphisms are given by a bundled function type.
The command creates the wrapper `Hom` type, named category and concrete category instances, `ofHom`, `Hom.hom`, and the basic dsimp lemmas.
It handles parameterized categories such as `ModuleCat`, and has a paired additive/multiplicative form for generating both structures at once (e.g. `MonCat`/`AddMonCat`).
Includes test categories checking the generated declarations.
[](https://gitpod.io/from-referrer/)
|
LLM-generated
t-meta
t-category-theory
|
1031/0 |
Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/MkConcreteCategory.lean,MathlibTest/CategoryTheory/MkConcreteCategory.lean |
4 |
18 |
['Vierkantor', 'dagurtomas', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts'] |
Vierkantor assignee:Vierkantor |
15-27745 15 days ago |
15-27745 15 days ago |
161-73868 161 days |
1 |
| 44396 |
mathlib-splicebot author:mathlib-splicebot |
chore(Analysis/Complex/UnitDisc/Basic): fix instance diamond |
There were two natural number power instances which differed at implicit transparency.
The `NatPowAssoc` instance is not necessary, hence can be removed.
Found by the linter in #38781.
Co-authored-by: Jovan Gerbscheid <jovan.gerbscheid@gmail.com>
-------- |
tech debt
t-analysis
|
11/16 |
Mathlib/Analysis/Complex/UnitDisc/Basic.lean |
1 |
3 |
['github-actions', 'grunweg', 'leanprover-radar'] |
nobody |
15-25604 15 days ago |
15-27300 15 days ago |
15-27557 15 days |
0 |
| 44139 |
Nicola9Falciola author:Nicola9Falciola |
refactor(LinearAlgebra/Matrix/Transvection): generalize the pivot elimination step to commutative rings |
---
The elimination steps in the pivot algorithm in `Matrix.Pivot` reduce to a diagonal
block the last row of a matrix using transvections only need the last diagonal
coefficient to be a unit over the base ring not that the ring itself is field.
This PR generalizes this step to work over a commutative ring `R`
instead of a field.
I also add the following API :
- `listTransvecCol_mul_mul_listTransvecRow_last_diag`: the elimination does not change the
last diagonal coefficient
- `exists_isTwoBlockDiagonal_and_last_eq_of_isUnit`
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|
t-algebra
LLM-generated
label:t-algebra$ |
128/110 |
Mathlib/LinearAlgebra/Matrix/Transvection.lean |
1 |
2 |
['Nicola9Falciola', 'github-actions'] |
nobody |
15-25023 15 days ago |
15-26678 15 days ago |
23-33125 23 days |
1 |
| 44400 |
sgouezel author:sgouezel |
chore: fix a non-reducible diamond in `MvPowerSeries` |
The following fails before the PR, succeeds after it:
```
example : ((MvPowerSeries.instCommRingRestricted
c).toNonUnitalSemiring : NonUnitalSemiring (MvPowerSeries.Restricted S c)) =
NonUnitalCommRing.toNonUnitalCommSemiring.toNonUnitalSemiring := by
with_implicit rfl
```
---
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-->
|
t-ring-theory
tech debt
|
4/5 |
Mathlib/RingTheory/MvPowerSeries/Restricted.lean |
1 |
1 |
['github-actions'] |
nobody |
15-12452 15 days ago |
15-22831 15 days ago |
15-22824 15 days |
0 |
| 36406 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/Matching): `#verts = 2 * #edgeSet` |
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics |
44/0 |
Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/SetTheory/Cardinal/Finite.lean |
3 |
4 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
15-10497 15 days ago |
15-14920 15 days ago |
16-12900 16 days |
1 |
| 40848 |
fbarroero author:fbarroero |
feat(RingTheory/DedekindDomain/SInteger): the ring of S-integers is a localization and a Dedekind Domain |
We prove
```
instance IsDedekindDomain.IsLocalizationSInteger. (R : Type *) [CommRing R] [IsDedekindDomain R]
(S : Set (HeightOneSpectrum R)) (K : Type *) [Field K] [Algebra R K] [IsFractionRing R K]
[Fact (Monoid.IsTorsion (ClassGroup R))] : IsLocalization S.Submonoid (S.integer K)
```
and
```
instance IsDedekindDomain.isDedekindDomainSInteger (R : Type *) [CommRing R] [IsDedekindDomain R]
(S : Set (HeightOneSpectrum R)) (K : Type *) [Field K] [Algebra R K] [IsFractionRing R K]
[Fact (Monoid.IsTorsion (ClassGroup R))] : IsDedekindDomain (S.integer K)
```
This is joint work with @larskuehne.
---
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory
large-import
|
162/4 |
Mathlib/RingTheory/DedekindDomain/SInteger.lean,Mathlib/RingTheory/Ideal/Prime.lean |
2 |
39 |
['copilot-pull-request-reviewer', 'faenuccio', 'fbarroero', 'github-actions', 'riccardobrasca', 'xroblot'] |
nobody |
15-5198 15 days ago |
36-34955 36 days ago |
68-70927 68 days |
1 |
| 44032 |
kim-em author:kim-em |
chore: remove backward.privateInPublic by wrapping proofs with private_decl% |
This PR removes 171 uses of `backward.privateInPublic` across 37 files. Wherever a public declaration used a private lemma in a proof position, the proof is wrapped with core's `private_decl%` elaborator, or with the `field := private proof` structure-instance syntax where the proof fills a structure field. Both elaborate the proof in a private context and hide it behind an auxiliary declaration, which is harmless by proof irrelevance. No declaration changes visibility and no statement changes, except that in `Combinatorics/SetFamily/AhlswedeZhang` the `Finset → Set` coercion in `lowerClosure s` is now written explicitly, since `private_decl%` elaborates eagerly and otherwise sees the coercion's pending metavariable.
This follows the plan of #42755 by @thorimur and takes its non-elaborator changes verbatim: moving `variable` commands out of `public section` in four files where almost every declaration is private (Galois/Decomposition, ChevalleyComplexity, GromovHausdorffRealized, NumberField/House; see https://github.com/leanprover/lean4/issues/14708 and https://github.com/leanprover/lean4/issues/14718), making the two lemmas used by the `sz_positivity` macro public under internal names, and separating data from proof in `binomExpansion` and `archimedeanClassOrderIso`. The difference is that this PR uses the elaborator that already exists in core rather than the `private` term elaborator proposed in #42563, so that it can land now. Once #42563 is in, every `private_decl% (…)` here can be replaced mechanically by `private …`. The 13 files that only need the field syntax are in #44023 and are not touched here.
🤖 Prepared with Claude Code |
tech debt |
135/274 |
Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Lie/BaseChange.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Algebra/Polynomial/Identities.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/Analysis/InnerProductSpace/TensorProduct.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Operator/Basic.lean,Mathlib/CategoryTheory/Galois/Decomposition.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorCategory/Complete.lean,Mathlib/CategoryTheory/Preadditive/CommGrp_.lean,Mathlib/Combinatorics/SetFamily/AhlswedeZhang.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Bound.lean,Mathlib/Computability/Primrec/List.lean,Mathlib/Data/Finset/Union.lean,Mathlib/FieldTheory/PerfectClosure.lean,Mathlib/GroupTheory/DivisibleHull.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/RootSystem/Basic.lean,Mathlib/ModelTheory/Algebra/Ring/FreeCommRing.lean,Mathlib/NumberTheory/NumberField/House.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/Lattice/Congruence.lean,Mathlib/RingTheory/Coalgebra/TensorProduct.lean,Mathlib/RingTheory/DividedPowers/Padic.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/RingTheory/PicardGroup.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/Topology/ExtremallyDisconnected.lean,Mathlib/Topology/MetricSpace/GromovHausdorffRealized.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean,Mathlib/Topology/UnitInterval.lean |
36 |
5 |
['JovanGerb', 'github-actions', 'kim-em', 'mathlib-merge-conflicts', 'thorimur'] |
nobody |
14-85804 14 days ago |
19-1095 19 days ago |
23-49260 23 days |
0 |
| 40435 |
bryangingechen author:bryangingechen |
ci: duplicate declarations report |
This adds a workflow that runs `lintDuplicateDeclarations` weekly and posts a summary to Zulip (with the full report in a workflow artifact).
The Zulip message contains the number of duplicate theorem, instance and def groups and is intentionally barebones for now. In future work we will make changes to `Tactic.DuplicateDeclarations` to make the report more useful.
Prepared with Claude code.
---
- [ ] depends on: #33640
|
|
148/0 |
.github/workflows/duplicate_decls_report.yml,docs/workflows.md,scripts/README.md,scripts/dup_decls_report.lean |
4 |
9 |
['bryangingechen', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib-splicebot'] |
nobody |
14-73766 14 days ago |
14-80641 14 days ago |
14-80760 14 days |
0 |
| 42647 |
martinwintermath author:martinwintermath |
feat(Geometry/Convex): add polytopes |
This PR adds the predicate `IsPolytope` for a subset of a `ConvexSpace`.
This is the first PR in a series of PRs implementing polytope theory.
---
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|
t-convex-geometry |
140/0 |
Mathlib.lean,Mathlib/Geometry/Convex/Polytope/Basic.lean,docs/references.bib |
3 |
65 |
['Parcly-Taxel', 'YaelDillies', 'faenuccio', 'github-actions', 'grunweg', 'martinwintermath', 'ooovi', 'vihdzp', 'wwylele'] |
faenuccio assignee:faenuccio |
14-61791 14 days ago |
14-62788 14 days ago |
59-54037 59 days |
0 |
| 42815 |
korbonits author:korbonits |
feat(Analysis/Calculus/VectorField): the Lie bracket acts as a derivation on functions |
Add `VectorField.lieBracket_apply_fun`: for a function `f` with derivative `f'` and vector fields `V`, `W`,
D(f' W) V - D(f' V) W = f' [V, W]
i.e. the familiar `[V, W] f = V (W f) - W (V f)`. The two second-derivative terms cancel by symmetry of the second derivative, leaving exactly the bracket.
Placed beside the existing `lieBracket_smul_*` product rules. Needs no new import: `FDeriv.Symmetric` is already imported for `second_derivative_symmetric`, which supplies the symmetry and is the source of the `IsRCLikeNormedField` hypothesis.
---
AI disclosure
- level: Level 5 / Level 6 in [the link shared](https://www.visidata.org/blog/2026/ai/#self-assessed-ai-level-for-contributions) I feel confident about the math but I am still learning Lean itself
- code: most of the Lean in this PR was drafted by Claude Code (statements, proofs, docstrings).
- direction and review: I chose the contribution, made the decisions, reviewed every line, and wrote all GitHub/Zulip comments. |
t-analysis
new-contributor
LLM-generated
t-differential-geometry
|
17/0 |
Mathlib/Analysis/Calculus/VectorField.lean |
1 |
11 |
['github-actions', 'korbonits', 'themathqueen'] |
nobody |
14-50110 14 days ago |
21-38378 21 days ago |
61-69483 61 days |
0 |
| 42393 |
xroblot author:xroblot |
feat(Algebra/QuadraticAlgebra): classify quadratic algebras over ℚ |
Every `QuadraticAlgebra ℚ a b` with nonzero discriminant is isomorphic to a standard form `QuadraticAlgebra ℚ d 0` for a squarefree integer `d`, and this `d` is a complete invariant. Thus quadratic algebras over `ℚ` are classified by squarefree integers.
---
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- [x] depends on: #42319
- [x] depends on: #42708
[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
101/0 |
Mathlib.lean,Mathlib/Algebra/QuadraticAlgebra/Rat.lean,Mathlib/Data/Rat/Squarefree.lean |
3 |
6 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
riccardobrasca assignee:riccardobrasca |
14-39238 14 days ago |
14-39769 14 days ago |
31-53789 31 days |
0 |
| 44304 |
robin-carlier author:robin-carlier |
chore(Order): make intervals implicit_reducible |
A bunch of `set_option backward.isDefEq.respectsTransparency false` I ran into could be removed by this:
In some personal project, automation got stuck because of the difference between `j ≤ i` and `j ∈ Set.Iic i` at implicit_reducible transparency.
I’m myself not convinced making these intervals `implicit_reducible` is the best, but declaring `j ≤ i = j ∈ Set.Iic i` as a true defeq-abuse (and hunting down every instance of this, adding `Set.mem_Iic.mpr <|` in every place that needs it) seems like overkill and a net regression on user experience.
Note that more generally, the question could arise for every semireducible declaration of type `Set α` where the body is `{ x | P x}` for some `P : α → Prop`.
---
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|
t-order |
8/5 |
Mathlib/Order/Interval/Set/Defs.lean |
1 |
10 |
['JX-Mo', 'SnirBroshi', 'github-actions', 'leanprover-radar', 'robin-carlier'] |
nobody |
14-38463 14 days ago |
14-38463 14 days ago |
15-86090 15 days |
0 |
| 44437 |
FawadHa1der author:FawadHa1der |
perf(Analysis/Normed/Lp/SmoothApprox): manifold-free proof of smooth approximation in Lp |
Authored with AI help. Created after @mcdoll feedback on [leanprover-community/mathlib4#42451](https://github.com/leanprover-community/mathlib4/pull/42451)
This is an alternate solution. This removes the manifold chain from the longest pole and even if the poisson summation is approved using denseRange_toLpCLM. We would still be saving roughly 5% in build time. There is only one new lemma but no change to existing lemmas/statements.
|
t-analysis
new-contributor
|
82/36 |
Mathlib/Analysis/Normed/Lp/SmoothApprox.lean |
1 |
3 |
['FawadHa1der', 'github-actions'] |
nobody |
14-31932 14 days ago |
14-32683 14 days ago |
14-32676 14 days |
0 |
| 44379 |
JokerXin2025 author:JokerXin2025 |
fix(tactic): skip implementation-detail declarations in `specialize_all` |
This commit fixes a bug in the `specialize_all` tactic that causes incorrect behavior in `specialize_all; assumption`.
In the original implementation of `specialize_all`, the statement `for h in ← getLCtx do` iterates over the entire local context without filtering out auxiliary declarations, particularly the theorem currently being proved. This allows the subsequent `assumption` tactic to directly use the local hypothesis produced by specializing that declaration, recursively “proving” the current theorem. This issue makes `tauto_set` unusable in many cases where it successfully executes `specialize_all` internally.
Here are some examples of the bug in `specialize_all` (before the fix):
```lean
import Mathlib.Tactic.TautoSet
/-- error: fail to show termination for
_example
with errors
failed to infer structural recursion:
Cannot use parameter x:
failed to eliminate recursive application
_example x✝ rfl -/
#guard_msgs (substring := true) in
example (x : ℕ) : {x} ⊆ Set.univ := by tauto_set
/-- error: fail to show termination for
_example -/
#guard_msgs (substring := true) in
example {α : Type} : α → False := by
intro x
specialize_all x
assumption
```
This issue does not cause Lean to accept the invalid proof, because it is rejected by the termination checker.
I fixed this issue by adding
```lean
unless h.isImplementationDetail do
```
after the loop statement above to filter out all implementation-detail hypotheses, including the auxiliary declaration for the current theorem. I also added three regression tests in `MathlibTest/Tactic/TautoSet.lean`. All three compile successfully now, but fail with `error: fail to show termination for ...` before the fix.
GPT-6-Astra was used to help locate the bug and translate the PR description to English.
---
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|
t-meta
new-contributor
maintainer-merge
|
21/2 |
Mathlib/Tactic/TautoSet.lean,MathlibTest/Tactic/TautoSet.lean |
2 |
11 |
['JokerXin2025', 'JovanGerb', 'github-actions', 'grunweg', 'plp127'] |
nobody |
14-23468 14 days ago |
14-64414 14 days ago |
15-14970 15 days |
0 |
| 41685 |
plp127 author:plp127 |
feat: free modular lattice on three generators |
We define `FreeModLatThree`, the free modular lattice on three generators, as an inductive type and prove the universal property.
---
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|
t-order
t-data
|
587/0 |
Mathlib.lean,Mathlib/Data/FreeModLatThree.lean |
2 |
11 |
['alreadydone', 'github-actions', 'mathlib-merge-conflicts', 'plp127', 'tb65536'] |
nobody |
14-16426 14 days ago |
14-17484 14 days ago |
94-13117 94 days |
0 |
| 38223 |
Deicyde author:Deicyde |
feat(Geometry/Manifold): add `MfldCat`, the category of `C^n` manifolds |
Defines `MfldCat 𝕜 n`: the category of `C^n` manifolds over a field `𝕜`, in which the model with corners is allowed to vary between objects. An object bundles a model vector space `E`, a model space `H`, a model with corners `I : ModelWithCorners 𝕜 E H` and a term of `ModelWithCorners.MfldCat I n`--see #41109. This includes manifolds with boundary / corners.
For more discussion see this Zulip thread: [#PR reviews > #38223 The Category of C^n Manifolds](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2338223.20The.20Category.20of.20C.5En.20Manifolds/with/587038032)
Also added: `ContMDiffMap.id_apply`, `.coe_id` and `.coe_comp` which are comparable to `ContinuousMap` API.
### Future work
- ✅ Define a Monoidal structure via product manifolds, analogous to `Manifold.Topology.Category.TopCat.Monoidal` #38560
- ✅ Define the tangent functor: `M ↦ TM`, `F ↦ F.tangentMap` from `MfldCat (n+1) 𝕜` to `MfldCat n 𝕜` #38270
- Functor `FGModuleCat 𝕜 ⥤ MfldCat 𝕜 n` sending a finite-dimensional `𝕜`-vector space to the manifold modeled on itself. Left as `TODO`.
- Define `FGModuleCat 𝕜` as an enriched category over `MfldCat n 𝕜`. Then _smooth functors_ can be realized as endofunctors on the enriched category. This is the main motivation for this construction.
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[](https://gitpod.io/from-referrer/)
|
t-differential-geometry
new-contributor
t-category-theory
|
210/0 |
Mathlib.lean,Mathlib/Geometry/Manifold/Category/MfldCat/Basic.lean,Mathlib/Geometry/Manifold/ContMDiffMap.lean |
3 |
63 |
['Deicyde', 'chrisflav', 'dagurtomas', 'github-actions', 'idontgetoutmuch', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'peabrainiac'] |
ocfnash assignee:ocfnash |
14-6103 14 days ago |
36-53597 36 days ago |
96-7429 96 days |
2 |
| 43925 |
xroblot author:xroblot |
feat(Algebra/Field/Subfield): the map/comap Galois coinsertion |
A ring homomorphism out of a field is injective, so the existing Galois connection between `map` and `comap` on subfields is in fact a `GaloisCoinsertion`, added here as `Subfield.gciMapComap`, along with what it yields: `comap_surjective`, `map_injective`, `map_le_map_iff`, the compatibility of `comap` with `⊓`, `⊔`, `⨅` and `⨆`, and three lemmas on `comap` along `s.subtype`.
The same is done for `IntermediateField` and `AlgHom`, as `IntermediateField.gciMapComap`, together with the basic `comap` lemmas that were missing there.
Prepared with Claude Code 🤖
---
|
t-algebra label:t-algebra$ |
149/2 |
Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Defs.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean |
3 |
3 |
['github-actions', 'tb65536', 'xroblot'] |
nobody |
13-66947 13 days ago |
28-44087 28 days ago |
28-60197 28 days |
1 |
| 42272 |
xroblot author:xroblot |
feat(Algebra/QuadraticAlgebra): the degenerate cases over a field |
Complete the classification of `QuadraticAlgebra K a b` over a field by describing the two degenerate case.
---
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|
t-algebra label:t-algebra$ |
41/0 |
Mathlib/Algebra/QuadraticAlgebra/Basic.lean,Mathlib/Algebra/QuadraticAlgebra/Discriminant.lean |
2 |
6 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
13-63379 13 days ago |
13-63981 13 days ago |
31-17315 31 days |
0 |
| 44428 |
kebekus author:kebekus |
feat: behavior of zero/pole divisors of meromorphic functions under differentiation |
Relate the divisor of `deriv f` to the divisor of a meromorphic function `f`, and deduce the corresponding statements for the logarithmic counting functions of Value Distribution Theory.
This material is used in [Project VD](https://github.com/kebekus/ProjectVD), formalizing Value Distribution Theory for meromorphic functions on the complex plane. Claude Code was used to create this PR.
---
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|
t-analysis
LLM-generated
|
152/0 |
Mathlib/Analysis/Complex/ValueDistribution/LogCounting/Truncated.lean,Mathlib/Analysis/Meromorphic/Divisor.lean,Mathlib/Analysis/Meromorphic/Order.lean |
3 |
1 |
['github-actions'] |
nobody |
13-38894 13 days ago |
13-38894 13 days ago |
13-38887 13 days |
0 |
| 43811 |
emlis42 author:emlis42 |
feat(Analysis/SpecialFunctions): add complex Lambert W function |
This PR adds complex Lambert W function, and proves basic bijectivity.
## Main definitions
* `Complex.LambertW.domain k`: the domain of the `k`-th branch in the z-plane.
* `Complex.LambertW.range k`: the range of the `k`-th branch in the w-plane.
* `Complex.LambertW.index hw`: the unique index of the branch containing `w ≠ -1`.
* `Complex.lambertW k`: the `k`-th branch `W_ k` of the Lambert W function.
## Main results
* `Complex.LambertW.existsUnique_mem_range_mul_exp_eq`: every point in the domain of a branch has a
unique preimage in its range.
* `Complex.LambertW.bijOn_mul_exp_range_domain`:
`w ↦ w * cexp w` is a bijection from `range k` to `domain k`.
* `Complex.lambertW_mul_exp_of_mem_range`:
`W_ k (w * cexp w) = w` for `w ∈ range k`.
* `Complex.lambertW_mul_exp_lambertW_of_mem_domain`:
`W_ k z * cexp (W_ k z) = z` for `z ∈ domain k`.
* `Complex.eq_mul_exp_iff_exists_eq_lambertW`: `z = w * cexp w` if and only if `w = W_ k z` for
some branch `k` with `z ∈ domain k`.
* `Complex.eq_index_of_mem_lambertW`: the branch index in the previous statement is
unique whenever `w ≠ -1`.
## Notations
* `W_ k` is `Complex.lambertW k`.
* `W₀` is the principal branch `W_ 0`.
* `W₋₁` is `W_ (-1)`.
Discussed here: [adding the Complex LambertW function](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/adding.20the.20Complex.20LambertW.20function/with/622137962)
---
I asked LLM some proof details like `im_eq_zero_of_arg_add_im_eq_pi_of_mul_exp_mem` |
t-analysis |
1059/0 |
Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Exp.lean,Mathlib/Analysis/SpecialFunctions/LambertW/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,docs/references.bib |
6 |
11 |
['Multramate', 'SnirBroshi', 'emlis42', 'github-actions', 'wwylele'] |
nobody |
13-31129 13 days ago |
31-38758 31 days ago |
31-40416 31 days |
2 |
| 42831 |
ray-shang author:ray-shang |
feat(CategoryTheory/Preadditive): category ring of preadditive category |
Given a preadditive category `C`, its category ring `CategoryRing C` is the non-unital ring
whose underlying additive group is the direct sum of all of its morphism groups `X ⟶ Y`, and
whose multiplication is induced by composition: the product of a morphism `f : X ⟶ Y` with a
morphism `g : Z ⟶ W` is `f ≫ g` when `Y = Z`, and `0` otherwise. When `C` is `R`-linear this ring
is a (non-unital) `R`-algebra, and when `C` has finitely many objects it is unital, with
unit `∑ X, 𝟙 X`.
This file formalizes `CategoryRing C` and its structure and universal property
when `C` is preadditive, `R`-linear, finite type, and both finite type and `R`-linear. For example,
when `C` is merely preadditive, the universal property of `CategoryRing C` is: non-unital ring
homomorphisms out of `CategoryRing C` correspond to `LiftData`, the data of a
compatible family of additive maps `(X ⟶ Y) →+ A` for a `NonUnitalNonAssocSemiring A`.
AI Usage: Gemini 3.1 Pro Extended Thinking is in use to generate proof terms for the custom induction principle to unwrap the nested direct sums of the category algebra. Human oversight and work determines the most efficient proof term.
---
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|
t-category-theory
new-contributor
|
706/0 |
Mathlib.lean,Mathlib/CategoryTheory/Preadditive/CategoryRing.lean |
2 |
11 |
['b-reinke', 'github-actions', 'joelriou', 'ray-shang', 'robin-carlier'] |
robin-carlier assignee:robin-carlier |
13-6100 13 days ago |
28-30480 28 days ago |
28-63502 28 days |
0 |
| 43745 |
theebayuser author:theebayuser |
feat(Geometry/Euclidean): add Euler's quadrilateral theorem |
Adds Euler's quadrilateral theorem to Mathlib/Geometry/Euclidean/, and records it in docs/1000.yaml (Q18630480). It states: for any four points, the sum of the squares of the four sides of the quadrilateral a b c d equals the sum of the squares of the two diagonals, plus four times the square of the distance between the midpoints of the diagonals.
This PR was written with AI assistance (Claude Code).
|
t-euclidean-geometry
new-contributor
LLM-generated
maintainer-merge
|
84/0 |
Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Geometry/Euclidean/EulerQuadrilateral.lean,docs/1000.yaml |
4 |
17 |
['github-actions', 'jsm28', 'theebayuser', 'wwylele'] |
nobody |
13-5200 13 days ago |
34-81085 34 days ago |
34-81078 34 days |
0 |
| 40973 |
certik author:certik |
feat: multiplicative automatic continuity on ℝ |
This PR adds the multiplicative companion of the existing additive automatic-continuity theorem `AddMonoidHom.continuous_of_measurable`. See the git commit descriptions for all the details.
Depends on https://github.com/leanprover-community/mathlib4/pull/40976.
AI usage disclosure: I used Claude Opus 4.8 to create the theorems and proofs in my own Lean project, then extracted them into this PR since I think they are general purpose and would be useful for other people. I iterated on the proofs until they are as simple as I could get them. I am new to Lean, so if something should be reworked, please let me know. Lean is amazing, I was able to use it to prove various theorems and check my derivations. This is my little contribution back to the project. |
t-measure-probability
LLM-generated
new-contributor
|
159/0 |
Mathlib.lean,Mathlib/MeasureTheory/Measure/Haar/AutomaticContinuity.lean |
2 |
10 |
['certik', 'github-actions', 'mathlib-merge-conflicts', 'wwylele'] |
nobody |
13-5199 13 days ago |
111-70028 111 days ago |
114-7318 114 days |
0 |
| 39420 |
mbkybky author:mbkybky |
feat(RingTheory/LocalProperties): `Module.Invertible` is a local property |
Let `M` be a finite `R`-module. We show that `M` is invertible if `Mₘ` is invertible for any maximal ideal `m` of `R`.
- [x] depends on: #39109
- [x] depends on: #39412
---
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory |
101/0 |
Mathlib.lean,Mathlib/RingTheory/LocalProperties/Invertible.lean |
2 |
2 |
['github-actions', 'mathlib-dependent-issues'] |
mattrobball assignee:mattrobball |
12-34505 12 days ago |
89-81070 89 days ago |
98-54270 98 days |
1 |
| 44487 |
artie2000 author:artie2000 |
feat(Algebra/GCDMonoid): `simp` lemmas for `normalize` being irreducible and prime |
* Add `simp` lemmas reducing `Irreducible (normalise x)` and `Prime (normalize x)` to `Irreducible x` and `Prime x`, respectively.
These are no-longer-relevant API lemmas split from #44287
---
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|
t-algebra label:t-algebra$ |
10/1 |
Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean |
2 |
1 |
['github-actions'] |
nobody |
12-24487 12 days ago |
12-26411 12 days ago |
12-26404 12 days |
0 |
| 33369 |
Thmoas-Guan author:Thmoas-Guan |
feat(Homology): `Ext` commute with flat base change |
In this PR, using the linear map `Ext(M,N) => Ext(F(M), F(N))` when `F` is exact functor, we prove that `Ext` commute with flat base change if the ring is noetherian and two modules are finitely generated, stated using `IsBaseChange`.
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|
t-topology
increases-technical-debt
|
379/0 |
Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Ext/BaseChange.lean |
2 |
13 |
['Multramate', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot'] |
urkud assignee:urkud |
12-6103 12 days ago |
13-53767 13 days ago |
70-17719 70 days |
6 |
| 41729 |
vaca22 author:vaca22 |
feat(RingTheory/DedekindDomain): add divisor group core |
Add the divisor group of a Dedekind domain as a formal-sum model, together with the additive equivalence to the multiplicative group of nonzero fractional ideals.
**Relation to what Mathlib already has.** As pointed out on Zulip, Mathlib already knows that fractional ideals factor: `FractionalIdeal.count` gives the exponent of a height-one prime, and `ClassGroup` is built from fractional ideals directly. This PR does not re-prove any of that — it reuses `count` and `finite_factors` verbatim. What it adds is the *additive* packaging:
* `IsDedekindDomain.Divisor R := HeightOneSpectrum R →₀ ℤ`, so a divisor is a finitely supported integer-valued function and one can write `D₁ + D₂`, `-D`, `D v`, and use the whole `Finsupp` API (`support`, `sum`, induction on the support);
* `FractionalIdeal.divisorEquiv`, an `AddEquiv` from `(FractionalIdeal R⁰ K)ˣ` to `Divisor R`, turning ideal multiplication into divisor addition.
The multiplicative view is the right one for the class group; the additive one is what divisor-theoretic arguments are written in, where one constantly forms `D - D'`, compares coefficients prime by prime, and does induction over `D.support`. Having both, related by a single `AddEquiv`, means neither side has to be re-derived.
**Downstream use.** This is the bottom layer of a formalization of Riemann–Roch for algebraic function fields (announced in `#AI authored projects > Riemann–Roch for function fields`): `L(D)`, `deg D`, and the statement `ℓ(D) = deg D + 1 - g + ℓ(W - D)` are all phrased in terms of additive divisors, and the degree map is defined by summing coefficients over `D.support`.
Happy to reshape the API — in particular whether `Divisor` should be an `abbrev` or a structure, and whether this belongs next to `Factorization` rather than in its own file.
AI usage: LLM-generated, disclosed per the AI policy.
|
t-ring-theory
new-contributor
LLM-generated
|
100/0 |
Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Divisor.lean |
2 |
4 |
['github-actions', 'grunweg', 'vaca22'] |
mattrobball assignee:mattrobball |
12-6101 12 days ago |
92-16069 92 days ago |
94-13265 94 days |
0 |
| 42125 |
NoneMore author:NoneMore |
feat(SetTheory/Cardinal): add cardinality bounds for direct limits |
Add an equivalence between a direct limit and its component at an upper-bound index. Use it to prove upper and lower cardinality bounds and criteria for computing the cardinality of direct limits.
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|
LLM-generated
t-set-theory
|
109/0 |
Mathlib.lean,Mathlib/Order/DirectedInverseSystem.lean,Mathlib/SetTheory/Cardinal/DirectLimit.lean |
3 |
2 |
['felixpernegger', 'github-actions'] |
alreadydone assignee:alreadydone |
12-6097 12 days ago |
81-74005 81 days ago |
81-73998 81 days |
2 |
| 42630 |
will1491 author:will1491 |
feat(Analysis/Complex): define Wirtinger derivatives |
Define the Wirtinger derivatives `Complex.wirtingerDeriv` and `Complex.wirtingerDerivBar` from `fderiv ℝ`, and prove: the Cauchy-Riemann characterization of complex differentiability (pointwise and on open sets), agreement of `wirtingerDeriv` with `deriv` for holomorphic functions, additivity, Leibniz product rules, conjugation identities, both Wirtinger chain rules, and the Wirtinger decomposition of a real-linear map `ℂ →L[ℝ] ℂ`.
Extracted from https://github.com/will1491/RiemannDynamics, where it underlies the Beltrami-equation and Cauchy/Beurling-transform theory used in the proof of the measurable Riemann mapping theorem.
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|
t-analysis
new-contributor
|
253/0 |
Mathlib.lean,Mathlib/Analysis/Complex/Wirtinger.lean |
2 |
3 |
['github-actions', 'mathlib-merge-conflicts'] |
urkud assignee:urkud |
12-6096 12 days ago |
36-20186 36 days ago |
66-82220 66 days |
0 |
| 44491 |
staroperator author:staroperator |
feat(Order/Ideal): reprove Rasiowa–Sikorski lemma and deprecate `Order.Cofinal` |
Reprove Rasiowa–Sikorski lemma as `Order.exists_ideal_meets_cofinals`. This non-constructive version is closer to its usual statement (e.g. `Countable` instead of `Encodable`), hides internal constructions and is shorter. Its dual version, `Order.exists_pfilter_meets_coinitials` which is used in set theory more often, will be proved in #34855 when `Order.PFilter` gets `to_dual`-ized.
We also deprecate `Order.Cofinal`, which is the bundled version of `IsCofinal` and can be replaced by its unbundled version.
**The proofs of `embedding_from_cg` and `equiv_between_cg` in ModelTheory/PartialEquiv.lean are fixed by LLM (GPT-6 Astra).** Others are written by me.
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|
t-order
increases-technical-debt
LLM-generated
|
140/86 |
Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/Order/Cofinal.lean,Mathlib/Order/CountableDenseLinearOrder.lean,Mathlib/Order/Ideal.lean |
4 |
1 |
['github-actions'] |
nobody |
11-81880 11 days ago |
11-83712 11 days ago |
12-1955 12 days |
1 |
| 42821 |
EtienneC30 author:EtienneC30 |
chore: deprecate PMF |
Deprecate [PMF](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Probability/ProbabilityMassFunction/Basic.html#PMF). The preferred spelling is to use [MeasureTheory.Measure.sum](https://leanprover-community.github.io/mathlib4_docs/Mathlib/MeasureTheory/Measure/MeasureSpace.html#MeasureTheory.Measure.sum) and [MeasureTheory.Measure.dirac](https://leanprover-community.github.io/mathlib4_docs/Mathlib/MeasureTheory/Measure/Dirac.html#MeasureTheory.Measure.dirac), see how [ProbabilityTheory.poissonMeasure](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Probability/Distributions/Poisson/Basic.html#ProbabilityTheory.poissonMeasure) and [ProbabilityTheory.geometricMeasure](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Probability/Distributions/Geometric.html#ProbabilityTheory.geometricMeasure) are defined for instance.
This was discussed on Zulip among reviewers, and see also https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/generic.20shannon.20entropy.20formalization.20mathlib4/near/584361371 for pointers to some PRs where some discussion on the topic happened.
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|
t-measure-probability
large-import
|
257/174 |
Mathlib/Probability/ProbabilityMassFunction/Basic.lean,Mathlib/Probability/ProbabilityMassFunction/Binomial.lean,Mathlib/Probability/ProbabilityMassFunction/Constructions.lean,Mathlib/Probability/ProbabilityMassFunction/Integrals.lean,Mathlib/Probability/ProbabilityMassFunction/Monad.lean |
5 |
5 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
11-65184 11 days ago |
11-66894 11 days ago |
11-66887 11 days |
0 |
| 37794 |
EtienneC30 author:EtienneC30 |
feat: a sum of independent binomial random variables is a binomial random variable |
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[](https://gitpod.io/from-referrer/)
|
t-measure-probability |
302/7 |
Mathlib/Probability/Distributions/Bernoulli.lean,Mathlib/Probability/Distributions/Binomial.lean,Mathlib/Probability/Distributions/SetBernoulli.lean |
3 |
16 |
['EtienneC30', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'sgouezel'] |
sgouezel assignee:sgouezel |
11-50948 11 days ago |
12-40691 12 days ago |
20-17982 20 days |
1 |
| 44094 |
Nicola9Falciola author:Nicola9Falciola |
feat(LinearAlgebra/Matrix/SpecialLinearGroup): add the induced group equiv on `SL n` by a ring equiv and the equivalence between `SL n (Π i, R i) ≃* Π i, SL n (R i) ` |
---
Following the API in Data/Matrix/Basic I add :
- The `MulEquiv` : ` SL n R ≃* SL n S` induced by a `RingEquiv` and relative API.
- The `MulEquiv` : `SL n (Π i, R i) ≃* Π i, SL n (R i)`
- I have added a `simp` lemma that for `SpecialLinearGroup.map` following the API for `Matrix` that was missing.
- The `MulEquiv` : `SL m R ≃* SL n S` induced by ` m ≃ n `.
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|
t-algebra label:t-algebra$ |
77/1 |
Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean |
1 |
1 |
['github-actions'] |
nobody |
11-44364 11 days ago |
21-29726 21 days ago |
23-73562 23 days |
1 |
| 36595 |
mcdoll author:mcdoll |
feat(Analysis/TemperedDistribution): polynomially bounded locally integrable functions define tempered distributions |
Every polynomially bounded and locally integrable function defines a tempered distribution, this generalizes the previous version for temperate growth functions.
Breaking change: we deprecate the temperate growth embedding - it is a special case and we prove that every temperate growth function satisfies the polynomial bound outside a compact set.
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|
t-analysis |
172/2 |
Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/Distribution/TemperateGrowth.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean |
6 |
3 |
['github-actions', 'mathlib-bors', 'mathlib-dependent-issues'] |
nobody |
11-35692 11 days ago |
11-38444 11 days ago |
11-38438 11 days |
0 |
| 44358 |
TJHeeringa author:TJHeeringa |
chore(LinearAlgebra): generalize IsAdjointPair |
The implemented definition `IsAdjointPair` required sesquilinear maps. This is a stronger requirement than necessary. This PR relaxes the conditions on `IsAdjointPair` to the minimal ones.
---
This is needed to generalize the RKHS from `InnerProductSpace/Reproducing.lean`.
The location of the definition is still `LinearAlgebra/SesquilinearForm/Basic`. That is clearly not a good fit. However, I don't know a better location either. Places like `LinearAlgebra/BilinearForm/Basic` are also dealing with a less general construction.
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|
t-algebra label:t-algebra$ |
94/45 |
Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean |
1 |
1 |
['github-actions'] |
nobody |
11-30967 11 days ago |
11-32182 11 days ago |
11-35200 11 days |
0 |
| 40967 |
Formalistic03 author:Formalistic03 |
feat(Combinatorics/SimpleGraph/Paths): some lemmas about inducing walks |
Could also be done via `SimpleGraph.Walk.map_induce`, but I thought that doing it directly is not much worse.
---
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[](https://gitpod.io/from-referrer/)
|
new-contributor
t-combinatorics
maintainer-merge
|
59/0 |
Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Maps.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/Sym/Sym2.lean |
4 |
34 |
['Formalistic03', 'SnirBroshi', 'github-actions'] |
b-mehta assignee:b-mehta |
11-15355 11 days ago |
12-24572 12 days ago |
105-38292 105 days |
0 |
| 41831 |
YaelDillies author:YaelDillies |
chore(RingTheory/TwoSidedIdeal): rid the `SMulMemClass (TwoSidedIdeal R) Rᵐᵒᵖ R` non-instance from its `inst` |
See https://github.com/leanprover-community/mathlib4/pull/40718#discussion_r3573863027.
---
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory |
3/1 |
Mathlib/RingTheory/TwoSidedIdeal/Basic.lean |
1 |
3 |
['Ruben-VandeVelde', 'YaelDillies', 'github-actions'] |
riccardobrasca assignee:riccardobrasca |
11-6103 11 days ago |
57-61273 57 days ago |
92-26156 92 days |
0 |
| 43104 |
elazarg author:elazarg |
feat(InformationTheory/KullbackLeibler): finite Kullback-Leibler divergence |
Add finite-sum formulas for `InformationTheory.klDiv` on finite measurable spaces, including equal-mass and probability-measure specializations and formulas for sums of weighted Dirac measures. Provide both `ℝ≥0∞`-valued and `toReal` versions.
Supporting API includes a formula for the Radon–Nikodym derivative at points of nonzero reference-measure mass, a finite-sum formula for the integral of the log-likelihood ratio, and singleton-mass and absolute-continuity lemmas for sums of weighted Dirac measures.
---
Continuing #42584, another part of https://github.com/elazarg/kraft.
Following review, this uses the existing `klDiv` instead of introducing `klDivFin`. The `toReal` formulas connect it to real-valued sums in downstream code.
For measures of unequal mass, the formulas retain the correction term `ν.real univ - μ.real univ`.
The KL formulas are in `KullbackLeibler/Basic.lean`; the supporting lemmas are in the corresponding measure-theory modules.
[](https://gitpod.io/from-referrer/)
|
t-measure-probability
new-contributor
LLM-generated
|
100/1 |
Mathlib/InformationTheory/KullbackLeibler/Basic.lean,Mathlib/MeasureTheory/Measure/Decomposition/RadonNikodym.lean,Mathlib/MeasureTheory/Measure/Dirac/Basic.lean,Mathlib/MeasureTheory/Measure/LogLikelihoodRatio.lean |
4 |
9 |
['EtienneC30', 'elazarg', 'github-actions', 'vlad902'] |
RemyDegenne assignee:RemyDegenne |
11-6099 11 days ago |
33-25485 33 days ago |
42-7156 42 days |
0 |
| 44524 |
Thmoas-Guan author:Thmoas-Guan |
refactor(RingTheory): make `ModuleCat.smulShortComplex` implicit reducible |
Currently, we are facing trouble on identification of `X_1` and `X_2` in short complex `M => M => M/xM => 0`. An direct benefit of this change can be seen in #32098
---
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|
t-ring-theory |
1/1 |
Mathlib/RingTheory/Regular/Category.lean |
1 |
1 |
['github-actions'] |
nobody |
10-84491 10 days ago |
11-39921 11 days ago |
11-39914 11 days |
0 |
| 44287 |
artie2000 author:artie2000 |
feat: root existence for odd-degree polynomials |
* Prove that every odd-degree polynomial has a monic irreducible odd-degree factor
* Prove that, if there are no nonlinear irreducible odd-degree polynomials over a particular field, then every odd-degree polynomial has a root
* Move `Polynomial.exists_monic_irreducible_factor` earlier (it doesn't need Gauss' lemma)
* Register the dichotomy between `Odd` and `Even` with `push`
---
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|
t-algebra
t-ring-theory
label:t-algebra$ |
58/28 |
Mathlib/Algebra/Order/Ring/GeomSum.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Ring/Int/Parity.lean,Mathlib/Algebra/Ring/Parity.lean,Mathlib/RingTheory/Polynomial/UniqueFactorization.lean |
5 |
17 |
['artie2000', 'github-actions', 'vihdzp'] |
nobody |
10-82866 10 days ago |
10-86088 10 days ago |
18-25262 18 days |
1 |
| 42195 |
Jun2M author:Jun2M |
refactor(Order/Partition): remove the support index from `Partition` |
Redefine `Partition α` as an independent collection of nonbottom elements of a complete lattice, with support `P.supp` defined as their supremum. In the special case `Partition (Set β)`, the parts are pairwise disjoint, nonempty sets and the support is their union.
Previously, `Partition s` carried its support as a type index. This made partitions of different sets inhabit different types and forced otherwise natural operations to transport partitions across support equalities.
BREAKING CHANGE: Replace the indexed type `Partition s` with `Partition α`, and obtain the former index from `P.supp`. When constructing a partition, omit the proof that the parts cover a prescribed set. `Partition.copy` and `Partition.partscopyEquiv` are no longer needed. Import the relevant `Mathlib.Order.Partition` submodule when using APIs moved out of `Basic`.
Deletions:
- Partition.copy
- Partition.mem_copy_iff
- Partition.partscopyEquiv
It also introduces some new definitions: `induce` & `bind`. These are added in this PR as they are needed to keep `SemiLattice` instance on `Partition`.
A new file `Set.lean` now houses defs and theorems of `Partition (Set _)`, including `IsRepFun` previously in `Basic` file.
This PR is partially generated by AI: Partition API written by myself in [Matroid repo](https://github.com/apnelson1/Matroid) has be adapted using codex and final checked by myself.
Co-authored-by: OpenAI Codex <codex@openai.com>
---
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[](https://gitpod.io/from-referrer/)
|
t-order |
624/399 |
Mathlib.lean,Mathlib/Order/Partition/Basic.lean,Mathlib/Order/Partition/Set.lean,Mathlib/Order/SupIndep.lean |
4 |
4 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
10-82255 10 days ago |
10-84137 10 days ago |
23-34389 23 days |
1 |
| 40531 |
tb65536 author:tb65536 |
feat(Combinatorics/Hypergraph/Coloring): define hypergraph colorings |
This PR defines hypergraph colorings and the chromatic index of a hypergraph.
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics |
66/0 |
Mathlib.lean,Mathlib/Combinatorics/Hypergraph/Coloring/Edge.lean |
2 |
6 |
['SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'tb65536'] |
YaelDillies assignee:YaelDillies |
10-80330 10 days ago |
11-36102 11 days ago |
121-65706 121 days |
0 |
| 44440 |
vincentqb author:vincentqb |
feat(Computability/TuringMachine): bound the output length of a TM2 run |
This PR bounds the output length of a TM2 run by the input length plus a machine constant times the step count. It deduces `TM2ComputableInPolyTime.length_le`, the polynomial output-length bound used in composition.
It also adds step-count induction and defines `initList` and `haltList` using `Function.update`.
---
Relates to #7172 #33132 #35366
The code, the testing, and this description were prepared with the help of an AI coding assistant (Codex).
|
t-computability
LLM-generated
new-contributor
|
82/7 |
Mathlib/Computability/StateTransition.lean,Mathlib/Computability/TuringMachine/Computable.lean,Mathlib/Computability/TuringMachine/StackTuringMachine.lean |
3 |
3 |
['github-actions', 'vincentqb'] |
nobody |
10-77099 10 days ago |
14-14073 14 days ago |
14-14066 14 days |
1 |
| 44536 |
vincentqb author:vincentqb |
feat(Probability): conditional variance of a Bernoulli random variable |
This PR proves `Var[X; P | m] =ᵐ[P] P[X | m] * P[1 - X | m]` for a random variable with law `Ber(1, 0, p)`.
It replaces the binomial `proof_wanted`, which is false: for `Bin(2, 1/2)` and the trivial σ-algebra, the variance is `1/2` while the proposed product is `0`.
---
Supersedes #44467. Independent of #42999, which proves the remaining binomial variance statement.
The code, the testing, and this description were prepared with the help of an AI coding assistant (Codex).
|
t-measure-probability
LLM-generated
new-contributor
|
15/10 |
Mathlib/Probability/Distributions/TwoValued.lean,Wanted/Probability/Distributions/Binomial.lean |
2 |
3 |
['github-actions', 'vincentqb'] |
nobody |
10-75820 10 days ago |
10-75820 10 days ago |
10-75813 10 days |
0 |
| 44541 |
vincentqb author:vincentqb |
feat(Computability/Partrec): computability of list operations |
This PR adds `Computable.list_foldl`, `list_foldr`, `list_rec`, and `list_map`, with the same statements as their `Primrec` counterparts.
---
The code, the testing, and this description were prepared with the help of an AI coding assistant.
|
LLM-generated
new-contributor
t-computability
|
37/0 |
Mathlib/Computability/Partrec.lean |
1 |
3 |
['github-actions', 'vincentqb'] |
nobody |
10-75785 10 days ago |
10-76042 10 days ago |
10-76035 10 days |
0 |
| 37838 |
Thmoas-Guan author:Thmoas-Guan |
feat(FieldTheory): basic theories about transcendental separable extension |
The formalization of [Stacks 030W] via [Stacks 030U].
---
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- [x] depends on: #37934
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[](https://gitpod.io/from-referrer/)
|
t-algebra
large-import
label:t-algebra$ |
475/16 |
Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/FieldTheory/TranscendentalSeparable.lean,Mathlib/RingTheory/LocalProperties/Reduced.lean |
3 |
27 |
['Multramate', 'Thmoas-Guan', 'github-actions', 'jjdishere', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
10-68576 10 days ago |
10-69316 10 days ago |
36-20023 36 days |
1 |
| 44086 |
bjornsolheim author:bjornsolheim |
feat(Analysis/Convex/Strict): farthest points are exposed in strictly convex spaces |
Proves the following (in a real strictly convex normed space):
`sphere_subset_exposedPoints_closedBall` - every point of a sphere is an exposed point of the
corresponding closed ball
`mem_exposedPoints_of_isMaxOn_dist` - a point `y ∈ S` that maximizes distance
to a fixed center `z` is an exposed point of `S`
`exposedPoints_closedBall_eq_sphere` - the exposed points of a closed ball
are exactly its sphere
Assisted by: Claude Fable 5.1 (used for research and to write or complete or improve some parts).
All lines are written or reviewed by me.
---
Optional comment |
t-analysis |
77/0 |
Mathlib.lean,Mathlib/Analysis/Convex/Strict/Exposed.lean |
2 |
2 |
['github-actions'] |
nobody |
10-63071 10 days ago |
24-36012 24 days ago |
24-36005 24 days |
1 |
| 32098 |
Thmoas-Guan author:Thmoas-Guan |
feat(RingTheory): injective dimension of quotSMulTop |
In this PR, we proved for finitely generated module `M` over noetherian ring `R`, if `x` in maximal ideal being both `R`-regular and `M`-regular, `injdim_R (M/xM) + 1 = injdim_{R/(x)} (M)`.
---
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|
t-ring-theory
increases-technical-debt
|
449/0 |
Mathlib.lean,Mathlib/RingTheory/Regular/InjectiveDimension.lean |
2 |
9 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot'] |
nobody |
10-55800 10 days ago |
45-52122 45 days ago |
45-54174 45 days |
6 |
| 41299 |
JovanGerb author:JovanGerb |
chore(DomAct): clean up `DomMulAct`/`DomAddAct` instances |
This PR cleans up the `DomMulAct`/`DomAddAct` instances using `inferInstanceAs`.
Instead having the `MyClass Mᵐᵒᵖ` instance imply the `MyClass Mᵈᵐᵃ` instance, we use `MyClass M` as the hypothesis. For this to work, some instances need to be moved from the group file to the ring file, so that the required instances are available.
Additionally, `@[to_additive]` is now only used in the group instances and not the ring instances.
---
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|
t-group-theory
large-import
|
21/16 |
Mathlib/Algebra/Module/Hom.lean,Mathlib/Algebra/Module/LinearMap/Basic.lean,Mathlib/Algebra/Ring/Opposite.lean,Mathlib/GroupTheory/GroupAction/DomAct/Basic.lean |
4 |
6 |
['JovanGerb', 'Whysoserioushah', 'github-actions', 'leanprover-radar', 'riccardobrasca'] |
nobody |
10-53557 10 days ago |
106-37920 106 days ago |
106-38188 106 days |
0 |
| 44531 |
emlis42 author:emlis42 |
feat(Analysis/SpecialFunctions): add the polylogarithm function |
This PR adds the polylogarithm function $$\mathrm{Li}_ s(z)$$, together with its integral representation, power series, the recurrence `z * deriv (Li_ (s + 1)) z = Li_ s z`, and analyticity off the branch cut.
## Main definitions
* `Complex.polylogKernel`: the integrand `polylogKernel z t = z / (cexp t - z)`.
* `Complex.polylogIntegral`: the integral representation
$$
\mathrm{Li}_ s(z) = \dfrac{1}{\Gamma(s)}\int_0^{\infty}t ^ {s - 1} \dfrac{z}{e^z -z} \mathrm{d}t
$$
* `Complex.polylogSeries`: the power series
$$
\mathrm{Li}_ s(z) = \sum_{n = 1}^{\infty} \dfrac{z^n}{n^s}
$$
* `Complex.polylog`: the polylogarithm `Li_ s z`.
## Main statements
* `Complex.polylog_eq_polylogSeries`: `Li_ s z = polylogSeries s z` for `‖z‖ < 1`.
* `Complex.summable_polylogSeries_of_norm_lt` and `_of_norm_le`: the defining series
is summable for `‖z‖ < 1`, resp. for `‖z‖ ≤ 1` when `1 < s.re`.
* `Complex.polylog_eq_polylogIntegral`: `Li_ s z = polylogIntegral s z` for `0 < s.re`
and `z` off the branch cut.
* `Complex.mul_deriv_polylog_add_one`: the recurrence
`z * deriv (Li_ (s + 1)) z = Li_ s z` for `z` off the branch cut.
* `Complex.analyticOnNhd_polylog_right`: `Li_ s` is analytic off the branch cut.
## Implementation notes
The definition follows DLMF 25.12: `Li_ s z` is defined on the complement of the
branch cut `Ici 1 ×ℂ {0}` via the integral representation for `0 < s.re`, and extended to
general `s` by repeatedly applying the recurrence
`Li_ s = z * deriv (Li_ (s + 1))` until the real part becomes positive.
On the branch cut itself we take the limit from the lower half-plane.
---
I used an LLM agent only to verify the definitions in this work. I did not use any LLM-generated code. |
t-analysis |
624/0 |
Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Polylog/Basic.lean,Mathlib/Topology/Separation/Hausdorff.lean |
3 |
2 |
['emlis42', 'github-actions'] |
nobody |
10-48527 10 days ago |
11-16116 11 days ago |
11-16109 11 days |
0 |
| 38331 |
Thmoas-Guan author:Thmoas-Guan |
feat(RingTheory/AdicCompletion): AdicCompletion of Noetherian ring is Noetherian |
For `I` an ideal of `R`, if `R/I` is Noetherian and `I` is finitely generated, the the completion of `R` wrt `I` is Noetherian.
---
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|
t-ring-theory
large-import
|
215/5 |
Mathlib/RingTheory/AdicCompletion/Noetherian.lean |
1 |
19 |
['Thmoas-Guan', 'erdOne', 'faenuccio', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
faenuccio assignee:faenuccio |
10-47995 10 days ago |
10-48744 10 days ago |
56-28543 56 days |
4 |
| 39075 |
Thmoas-Guan author:Thmoas-Guan |
feat(Algebra/CommRingCat): colimit of local ring via local hom |
In this PR, we deal with filtered colimit of local ring via local homomorphisms, proving it is
again local, with maximal ideal equal to the union of images of maximal ideals.
Further more, we proved their residue field is colimit too (in category of local ring, residue field functor preserve colimit).
Co-authored-by: Wang Jingting <wangjt2020@163.com>
---
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|
t-algebra label:t-algebra$ |
218/0 |
Mathlib.lean,Mathlib/Algebra/Category/Ring/FilteredColimitsLocal.lean |
2 |
15 |
['Thmoas-Guan', 'github-actions', 'riccardobrasca', 'robin-carlier', 'xyzw12345'] |
mattrobball assignee:mattrobball |
10-45895 10 days ago |
10-74694 10 days ago |
150-76510 150 days |
3 |
| 41531 |
luigi-massacci author:luigi-massacci |
feat: scalar multiplication as a CLM on D^n |
Introduces for `TestFunction` the analogous results from `SchwartzMap`.
---
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|
t-analysis |
54/3 |
Mathlib/Analysis/Distribution/TestFunction.lean |
1 |
10 |
['github-actions', 'luigi-massacci', 'luigimassacci-ax', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mcdoll'] |
nobody |
10-39550 10 days ago |
29-41219 29 days ago |
29-41637 29 days |
4 |
| 41915 |
theebayuser author:theebayuser |
feat(Data/List): infixes, the enumerator of contiguous factors |
This PR adds `List.infixes`, which is the list of all infixes of a list.
---
AI disclosure: This code was mostly generated by Claude Fable 5 and Opus 4.8 as part of my larger project on combinatorics on words, which I then reviewed and revised to contribute to mathlib.
|
t-data
LLM-generated
new-contributor
|
37/2 |
Mathlib/Data/List/Infix.lean |
1 |
4 |
['github-actions', 'mathlib-merge-conflicts', 'theebayuser'] |
joneugster assignee:joneugster |
10-11879 10 days ago |
39-26972 39 days ago |
89-81267 89 days |
0 |
| 42336 |
kim-em author:kim-em |
feat(Tactic): add sum-of-squares tactic |
This PR adds the `leanprover/sos` tactic to Mathlib. See `MathlibTest/Tactic/SOS/Showcase.lean` for example applications.
---
## Review order
The history is deliberately six buildable commits, in this order:
1. `feat(Cache): fetch prebuilt native dependencies` — the Lake/cache boundary, tests, workflow hook, security documentation, and stable engine pin.
2. `feat(Tactic/SOS): add exact certificate verifier` — the small proof-facing polynomial and certificate layer.
3. `feat(Tactic/SOS): add sum-of-squares tactic` — reification, lifting, tactic elaboration, and public imports.
4. `test(Tactic/SOS): cover published examples and trust boundary` — the announcement showcase, Harrison examples, Blekherman–Bodirsky–Raghavendra follow-up examples, division/modulus coverage, issue #50, and axiom audit.
5. `chore(Tactic/SOS): use Lean 4.34 native releases` — the final SOS/CSDP release pins and simplified provider-release fetch.
6. `refactor(Tactic/SOS): share certificate quotation` — moves reusable certificate decompilation, quotation, and formatting into SOS v0.2.4, and removes obsolete commentary and repeated end-to-end examples. This layer reduces the Mathlib diff by 405 lines without removing distinct tactic paths or active negative tests.
## Trust and cache boundary
CSDP is a search oracle, not part of the logical trusted base. The tactic converts its answer to exact rational data and closes the goal through the checked verifier and Lean kernel.
Mathlib's cache command fetches `@CSDP:release` before unpacking the ordinary Lean cache. CSDP v0.1.2 supplies its complete platform build, so a cold checkout retains the normal invariant without compiling CSDP components:
```bash
lake exe cache get
lake build --no-build
```
The checked-in manifest pins the provider source, and the cache helper executes only its explicit allowlist. CSDP does not use Lake's implicit preferred-release job, so an ordinary offline or sandboxed build can still fall back to its bundled portable sources.
The Mathlib requirement points to the immutable, Mathlib-free SOS v0.2.4 release. Its Hex dependencies are likewise pinned to stable releases.
## Required landing order
1. Merge this Mathlib PR while it points to the stable SOS release tag.
2. Update SOS `main` to the staged Mathlib-free engine branch.
3. Make a one-line Mathlib follow-up changing the SOS requirement from the release tag back to `main`.
|
t-meta |
4002/2 |
Cache/IO.lean,Cache/Main.lean,Cache/Native.lean,Cache/README.md,Cache/SECURITY.md,Cache/Test.lean,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SOS.lean,Mathlib/Tactic/SOS/Certificate.lean,Mathlib/Tactic/SOS/Lift.lean,Mathlib/Tactic/SOS/Polynomial.lean,Mathlib/Tactic/SOS/Raw.lean,Mathlib/Tactic/SOS/Reify.lean,Mathlib/Tactic/SOS/Tactic.lean,Mathlib/Tactic/SOS/Verifier.lean,MathlibTest/Tactic/SOS/Axioms.lean,MathlibTest/Tactic/SOS/BBR.lean,MathlibTest/Tactic/SOS/DivMod.lean,MathlibTest/Tactic/SOS/Examples.lean,MathlibTest/Tactic/SOS/Harrison.lean,MathlibTest/Tactic/SOS/Issue50.lean,MathlibTest/Tactic/SOS/Showcase.lean,docs/workflows.md,lake-manifest.json,lakefile.lean |
26 |
4 |
['JovanGerb', 'github-actions', 'joneugster', 'mathlib-merge-conflicts'] |
nobody |
10-10530 10 days ago |
30-66756 30 days ago |
36-69948 36 days |
0 |
| 41042 |
Raph-DG author:Raph-DG |
feat(Topology/CategoryTheory): the skyscraper sheaf as a sheaf of modules |
In this PR we define the skyscraper sheaf as a sheaf of modules
---
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|
t-algebra label:t-algebra$ |
383/0 |
Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Skyscraper.lean |
2 |
5 |
['Raph-DG', 'attilavjda', 'chrisflav', 'github-actions', 'mathlib-merge-conflicts'] |
ocfnash assignee:ocfnash |
10-6103 10 days ago |
63-68811 63 days ago |
78-82146 78 days |
0 |
| 43539 |
abhijitaj1997 author:abhijitaj1997 |
feat(CategoryTheory/Monoidal/Cartesian/Endomorphism): add ring and semiring structures |
Given two monoidal object in a nice enough category, this show that the monoidal morphisms between then forms an additive group. This additive group is part of a larger semiring structure.
---
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|
new-contributor
t-category-theory
|
165/0 |
Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Endomorphism.lean |
2 |
36 |
['Multramate', 'abhijitaj1997', 'alreadydone', 'github-actions', 'joelriou', 'robin-carlier'] |
joelriou assignee:joelriou |
10-6098 10 days ago |
35-39638 35 days ago |
37-85526 37 days |
0 |
| 43987 |
grunweg author:grunweg |
chore: reorder mvfderiv lemmas |
Previously, there was a section of lemmas about mvfderivWithin, then a corresponding section about mvfderiv. Ensuring these sections matched was a bit cumbersome, as one had to scroll back and forth all the time.
Instead, move a lemma mvfderiv_foo right after its counterpart mvfderivWithin_foo. (Usually, this matches how it is proved also.) This matches the structure in e.g. the file about mfderiv.
---
- [x] depends on: #43986
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the commit message (that is, directly before the `---`) using the following format:
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[](https://gitpod.io/from-referrer/)
|
t-differential-geometry |
36/35 |
Mathlib/Geometry/Manifold/MFDeriv/NormedSpace.lean |
1 |
2 |
['github-actions', 'mathlib-dependent-issues'] |
ocfnash assignee:ocfnash |
10-6097 10 days ago |
24-19254 24 days ago |
24-19307 24 days |
1 |
| 44269 |
ROTARTSI82 author:ROTARTSI82 |
feat(Dynamics): periodic orbits must jump up and down |
If x is a periodic point and not a fixed point, there exists some b in its periodic orbit such that b < f b, and some b' such that f b' < b'.
---
This change was motivated by the following proof, a special case of Sharkovskii's theorem:
```lean
theorem exists_isFixedPt_of_continuous_of_mem_periodicPts' {α : Type*}
[ConditionallyCompleteLinearOrder α] [TopologicalSpace α] [OrderTopology α] [DenselyOrdered α]
{f : α → α} {x₀ : α} (hx₀ : x₀ ∈ periodicPts f)
(hf : Continuous f) :
∃(c : α), IsFixedPt f c := by
by_cases hfixed : IsFixedPt f x₀
· exact ⟨x₀, hfixed⟩
obtain ⟨a, _, ha⟩ := exists_lt_map_of_mem_periodicPts hx₀ hfixed
obtain ⟨b, _, hb⟩ := exists_map_lt_of_mem_periodicPts hx₀ hfixed
obtain ⟨c, _, hc⟩ := exists_mem_uIcc_isFixedPt hf.continuousOn ha.le hb.le
exact ⟨c, hc⟩
```
Would this theorem itself or something similar be wanted in mathlib?
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|
new-contributor
t-dynamics
|
39/0 |
Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Order/Monotone/Basic.lean |
2 |
3 |
['ROTARTSI82', 'github-actions'] |
urkud assignee:urkud |
10-6095 10 days ago |
18-77842 18 days ago |
18-77835 18 days |
0 |
| 43719 |
Thmoas-Guan author:Thmoas-Guan |
feat(LinearAlgebra): add API for exterior algebra of ring itself |
In this PR, we added some API for handling `ExteriorAlgebra R R`.
AI disclosure: the proof in section "self" is generated by AI after providing the final target definition and characterizing lemma.
---
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[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
61/0 |
Mathlib/LinearAlgebra/ExteriorAlgebra/Basic.lean |
1 |
1 |
['github-actions'] |
nobody |
9-72564 9 days ago |
35-44242 35 days ago |
35-44235 35 days |
2 |
| 44554 |
JovanGerb author:JovanGerb |
chore: adaptations for stronger `simpNF` - part 1 |
In some cases the `simpNF` linter does not warn when it should warn. Fixing this in `simpNF` surfaces many violations. This PR fixes many of those violations.
- `MvPolynomial.coeff_sub`, `MvPolynomial.coeff_neg` and `MvPolynomial.coeff_smul` have been deprecated, analogously to how `MvPolynomial.coeff_add` was deprecated in #41427. To make adaptations smoother, I added a lemma `AddMonoidAlgebra.coeff_sub_apply`.
---
<!-- Your PR title will become the first line of the commit message.
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- Nat.bit1_add_bit1
- ...
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below the `---`, and placed outside this HTML comment, or else they
will be invisible to reviewers.
If this PR depends on other PRs, please list them below this comment,
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|
tech debt |
100/128 |
Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Semi.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/Group/Action/Equidecomp.lean,Mathlib/Algebra/Group/Action/Units.lean,Mathlib/Algebra/Lie/Cochain.lean,Mathlib/Algebra/Lie/Extension.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/CommRing.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Ring/Subring/Defs.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Real/Hyperreal.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Category/Preorder.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/Data/Set/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/Order/Filter/FilterProduct.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Probability/Kernel/Basic.lean,Mathlib/Probability/Kernel/Integral.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RingTheory/MvPolynomial/Groebner.lean,Mathlib/RingTheory/MvPolynomial/IrreducibleQuadratic.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean,Mathlib/RingTheory/MvPowerSeries/Equiv.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/ContinuousMap/ContinuousMapZero.lean,Mathlib/Topology/FiberBundle/Constructions.lean,Mathlib/Topology/LocallyFinsupp.lean,Mathlib/Topology/MetricSpace/Snowflaking.lean |
37 |
13 |
['JovanGerb', 'github-actions', 'leanprover-radar', 'vihdzp'] |
nobody |
9-50128 9 days ago |
10-8629 10 days ago |
10-15939 10 days |
0 |
| 44141 |
JX-Mo author:JX-Mo |
chore(RepresentationTheory): remove DecidableEq condition |
We remove 15 `DecidableEq`s by openning `Classical` only occasionally in `Equiv.lean`, so that all downstream proofs do not need to carry this condition.
Note that they are already `noncomputable` even with `DecidableEq` anyway: `finsuppTensorLeft/Right` needs `TensorProduct.finsuppLeft/Right` which is `noncomputable` |
t-algebra
tech debt
label:t-algebra$ |
18/21 |
Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/Equiv.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/FiniteCyclic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Shapiro.lean |
5 |
8 |
['JX-Mo', 'Whysoserioushah', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts'] |
nobody |
9-46972 9 days ago |
17-25442 17 days ago |
23-26311 23 days |
1 |
| 44427 |
xroblot author:xroblot |
feat(Tactic/NormNum): norm_num extension for Squarefree |
Add a `norm_num` extension deciding `Squarefree n` for numerals `n` in `ℕ` and `ℤ`.
If `n` is not squarefree, the proof uses a witness `a > 1` with `a * a ∣ n`, found with `Nat.minSqFac`. If `n` is squarefree, the proof is a trial division of `n` by the odd numbers `k = 3, 5, 7, …`, keeping the invariant that every prime divisor of the cofactor is at least `k`.
This is adapted from the Mathlib 3 extension by Mario Carneiro (mathlib#11666), which was left commented out in `Mathlib.Data.Nat.Squarefree` during the port. This commented-out code is removed, and the corresponding tests are restored.
As for the `Nat.Prime` extension, the proof is a certificate rather than a kernel evaluation of `Nat.minSqFac` via `Nat.squarefree_iff_minSqFac`. The certificate is also faster to check, but, as for `Nat.Prime`, large numbers need a higher `maxRecDepth`.
**Note**. I have read and checked the ordinary Lean statements and their proofs, but I am not familiar with metaprogramming, so I cannot really vouch for the meta code itself, which was written with the help of an LLM. A review by someone who is comfortable with `norm_num` extensions would be very welcome.
Created with Claude Code 🤖
---
|
tech debt
t-meta
LLM-generated
|
198/205 |
Mathlib.lean,Mathlib/Data/Nat/Squarefree.lean,Mathlib/Tactic.lean,Mathlib/Tactic/NormNum/Squarefree.lean,MathlibTest/Tactic/NormNum/Ext.lean |
5 |
1 |
['github-actions'] |
nobody |
9-41808 9 days ago |
9-41808 9 days ago |
14-18728 14 days |
0 |
| 44392 |
yhx-12243 author:yhx-12243 |
fix(Algebra/Polynomial/Roots): fix tendstoCofinite with normal generic universe |
Remove the extraneous accidentally {R : Type} [CommRing R] [IsDomain R] in the signature of `Polynomial.tendstoCofinite_of_natDegree_ne_zero`, make it generic. |
t-algebra
new-contributor
label:t-algebra$ |
2/2 |
Mathlib/Algebra/Polynomial/Roots.lean |
1 |
3 |
['github-actions', 'plp127'] |
nobody |
9-34905 9 days ago |
15-41047 15 days ago |
15-41040 15 days |
0 |
| 44573 |
bryangingechen author:bryangingechen |
ci: push style fixes automatically and remove `bot fix style` |
This PR merges `pre-commit.yml` into `lint_and_suggest_pr.yml` so that all automatic style fixes are pushed to the PR by pre-commit.ci lite, and removes the `bot fix style` command, which has not worked since 2025.
On every PR, including drafts, the job now runs `lint-style-action` in its new `fix-worktree` mode (leanprover-community/lint-style-action#13: `mk_all`, `lint-style --fix` and `lint-bib.sh`, with the results left in the working tree), then the `pre-commit` hooks, and then `pre-commit-ci/lite-action`. Both sets of fixes arrive as a single `[pre-commit.ci lite]` commit, which replaces the reviewdog suggestions. Its message names the commands that changed something, such as `[pre-commit.ci lite] lake exe mk_all; lake exe lint-style --fix`, so that contributors can see how to make the same fixes locally.
Other changes:
- A per-PR concurrency group, with the lite action on `success() || failure()` rather than `always()`, so that a run superseded by a newer push cannot push stale fixes.
- The workflow's token is read-only, since the job builds code from the PR and nothing in it needs to write any more.
- The `.lean`/`.md` file-extension check moves to its own job, so that its failure cannot stop the fixes from being pushed.
- `pre-commit.yml`'s `push` trigger goes away, because the lite action only acts on `pull_request`.
- `bot_fix_style.yaml` is deleted. It was the last user of `lint-style-action`'s `fix` mode, which was removed upstream in leanprover-community/lint-style-action#12. It also started a no-op run on every comment and review in the repository.
- `style_lint` in `build_template.yml` moves to the same `lint-style-action` version, so the repository has a single pin and nothing uses the `mathlib4-compat` branch any more. `actions/checkout` v7 refuses fork PR code under `pull_request_target`, and the action's own checkout has no way to opt in. So the job now checks out `pr_branch_ref` itself, the same way `post_steps` does (`allow-unsafe-pr-checkout`, no persisted credentials), and passes `checkout: false`.
The commit messages have the details, including the evidence that `bot fix style` has been broken since lint-style-action 5f18958.
---
Unfortunately, due to restrictions on both GitHub's side and pre-commit.ci lite's side, it doesn't appear that we can get pre-commit.ci lite to run for PRs opened by SpliceBot. I will tackle that in a separate PR.
<details><summary>Testing details</summary>
Fork PRs run `style_lint` from master's `build_template.yml`, so this PR's own CI doesn't exercise the new `style_lint`. It passed in [this `ci_dev.yml` run](https://github.com/leanprover-community/mathlib4/actions/runs/37561508273/job/112599599237) on `ci-dev/bgc/consolidate-autofix`. Once this merges, the `mathlib4-compat` branch of `lint-style-action` can be deleted.
The autofix job was tested end to end on the throwaway PR #44574, which is now closed; the results are in its last comment. A single bot commit carried fixes from `mk_all`, `lint-style --fix` and `pre-commit` together, runs cancelled by the concurrency group skipped the lite step, and the run on the bot's commit was green with the lite step skipped.
The `references.bib` fix and the commit message were tested on the throwaway PR #44576, which is now closed; the results are in its last comment.
</details>
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
file-removed
CI
LLM-generated
|
132/90 |
.github/workflows/bot_fix_style.yaml,.github/workflows/build_template.yml,.github/workflows/lint_and_suggest_pr.yml,.github/workflows/pre-commit.yml,docs/workflows.md |
5 |
5 |
['SnirBroshi', 'bryangingechen', 'github-actions'] |
nobody |
9-29013 9 days ago |
10-166 10 days ago |
10-159 10 days |
0 |
| 44600 |
artie2000 author:artie2000 |
feat: relationship between real and semireal rings |
* Prove that real rings are semireal and that semireal fields are real
* Clean up documentation between the two
---
<!-- Your PR title will become the first line of the commit message.
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-->
|
t-algebra label:t-algebra$ |
39/1 |
Mathlib.lean,Mathlib/Algebra/Ring/IsFormallyReal.lean,Mathlib/Algebra/Ring/Semireal/Basic.lean,Mathlib/Algebra/Ring/Semireal/Defs.lean |
4 |
7 |
['artie2000', 'github-actions', 'vihdzp'] |
nobody |
9-18264 9 days ago |
9-18881 9 days ago |
9-34232 9 days |
0 |
| 44613 |
keithadler author:keithadler |
feat(RepresentationTheory): irreducible representations are bounded by conjugacy classes |
For a finite group `G` and an algebraically closed field `k` in which `|G|` is invertible, `Representation.char_orthonormal` gives orthogonality of irreducible characters. This PR adds the consequence that is used in practice:
* `Representation.classFunction ρ : ConjClasses G → k`, the character as a class function;
* `Representation.linearIndependent_classFunction`: the class functions of a family of pairwise non-isomorphic irreducible representations are linearly independent;
* `Representation.card_le_card_conjClasses`: such a family has at most `Nat.card (ConjClasses G)` members.
This is the upper-bound half of "the number of irreducible representations equals the number of conjugacy classes" (the other half, that characters span the class functions, is not yet in Mathlib). The bound is exactly what is needed to show that an explicit list of `Nat.card (ConjClasses G)` pairwise non-isomorphic irreducibles is complete; e.g. with the companion PR on conjugacy classes of `Perm α`, that the Specht modules exhaust the irreducible representations of `S_n` (used downstream in https://github.com/keithadler/saxl-lean).
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---
|
t-algebra
new-contributor
LLM-generated
label:t-algebra$ |
118/0 |
Mathlib.lean,Mathlib/RepresentationTheory/CharacterCount.lean |
2 |
2 |
['github-actions'] |
nobody |
9-14192 9 days ago |
9-24516 9 days ago |
9-24509 9 days |
0 |
| 44618 |
barni120400 author:barni120400 |
feat(RingTheory/MvPolynomial/Homogeneous): powers of linear forms span the homogeneous polynomials |
Prove that the `n`-th powers of linear forms span the homogeneous polynomials of degree `n` (`MvPolynomial.homogeneousSubmodule_eq_span_pow`). Along the way, add the identity `Finset.sum_powerset_neg_one_pow_card_mul_sum_sdiff_pow_card` used in the proof.
---
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
t-data
new-contributor
LLM-generated
|
64/0 |
Mathlib/Data/Nat/Choose/Sum.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean |
2 |
2 |
['github-actions'] |
nobody |
9-14128 9 days ago |
9-17259 9 days ago |
9-19467 9 days |
0 |
| 44040 |
kim-em author:kim-em |
chore: adaptation notes for the backward.privateInPublic uses blocked on lean4#14708 |
This PR adds an `#adaptation_note` at each `variable` declaration with an autoParam binder whose users need `backward.privateInPublic`. These uses (about 80 of the remaining option lines, in 14 files) are not removable on the Mathlib side: the autoParam helper declaration generated for a `variable` is always private, and any declaration using that variable in a public section silently elaborates to `sorry` without the option. This is https://github.com/leanprover/lean4/issues/14708. The note says which `set_option`s can go once that is fixed, and stops anyone from spending time on them before then. Each affected file was checked by removing its `true`-only option lines and observing the `sorry` warnings and the follow-on `autoParam … is not a constant` errors.
It also deletes the one option line in `CategoryTheory/SmallObject/Iteration/ExtendToSucc` that turned out to be unnecessary.
🤖 Prepared with Claude Code |
tech debt
LLM-generated
|
116/0 |
Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStruct.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/NonUnital.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/CategoryTheory/ComposableArrows/Basic.lean,Mathlib/CategoryTheory/Join/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Reflexive.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/ChosenPullbacksAlong.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/CommGrp_.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Sites/Point/Basic.lean,Mathlib/CategoryTheory/SmallObject/Iteration/ExtendToSucc.lean |
15 |
1 |
['github-actions'] |
nobody |
9-14088 9 days ago |
25-5908 25 days ago |
25-7086 25 days |
0 |
| 42357 |
SynBurz author:SynBurz |
feat: the Krull dimension of the product of finitely many rings is equal to the maximum of Krull dimensions of the factors |
Add `ringKrullDim_pi_eq_iSup_ringKrullDim`. Also add useful defs: `LTSeries.sigmaEquiv`, `PrimeSpectrum.sigmaToPiOrderIso`, and lemmas `PrimeSpectrum.sigmaToPiOrderIso_apply`, Pi.not_comap_evalRingHom_le_comap_of_neq`, `LTSeries.sigma_fst_eq_fst`.
---
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|
new-contributor
t-algebra
label:t-algebra$ |
93/0 |
Mathlib/Order/RelSeries.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean |
3 |
6 |
['SynBurz', 'github-actions', 'mathlib-merge-conflicts', 'wwylele'] |
nobody |
9-13872 9 days ago |
9-15737 9 days ago |
38-26545 38 days |
0 |
| 25982 |
Multramate author:Multramate |
feat(AlgebraicGeometry/EllipticCurve/Group): compute range of baseChange |
This PR continues the work from #10142.
Original PR: https://github.com/leanprover-community/mathlib4/pull/10142 |
t-algebraic-geometry
large-import
|
214/21 |
Mathlib.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Ring/Action/Submonoid.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Galois.lean,Mathlib/GroupTheory/GroupAction/Defs.lean |
5 |
4 |
['Multramate', 'github-actions', 'tb65536'] |
joelriou assignee:joelriou |
9-6101 9 days ago |
22-24277 22 days ago |
22-29062 22 days |
0 |
| 41904 |
rshlyakh author:rshlyakh |
feat(RingTheory/KrullDimension): add Krull dimension preservation under injective integral extensions |
This proves that an injective integral homomorphism of commutative rings
preserves Krull dimension, based on the `Algebra.HasGoingUp` infrastructure from #40911. It includes:
- `RingHom.IsIntegral.ringKrullDim_eq_of_injective`: injective integral homomorphisms of
commutative rings preserve Krull dimension.
- `RingHom.IsIntegral.ringKrullDim_quotient_ker_eq`: for an integral extension `f : A →+* B`,
the Krull dimension of `B` is equal to the Krull dimension of `A ⧸ RingHom.ker f`.
- [x] depends on: #40911
- [x] depends on: #41058
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|
t-ring-theory
new-contributor
|
77/12 |
Mathlib.lean,Mathlib/RingTheory/Ideal/HasGoingUp.lean,Mathlib/RingTheory/KrullDimension/Integral.lean |
3 |
14 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'rshlyakh', 'vlad902'] |
mariainesdff assignee:mariainesdff |
9-6098 9 days ago |
63-13008 63 days ago |
89-72894 89 days |
1 |
| 42786 |
rshlyakh author:rshlyakh |
feat(Data/Finsupp/NatCard): count finsupps of bounded degree |
Adds the formula that the number of finitely-supported functions `α →₀ ℕ` with degree less than or equal to `n` is equal to `Nat.choose (Nat.card α + n) n`. The proof is by establishing an equivalence `Sym (Option α) n ≃ {f : α →₀ ℕ // f.degree ≤ n}` and using the stars-and-bars formula `Sym.equivNatSum.`
---
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|
t-data
new-contributor
|
56/0 |
Mathlib.lean,Mathlib/Data/Finsupp/NatCard.lean |
2 |
2 |
['github-actions'] |
TwoFX assignee:TwoFX |
9-6094 9 days ago |
63-1963 63 days ago |
63-4590 63 days |
0 |
| 44470 |
SnirBroshi author:SnirBroshi |
feat(SetTheory/Ordinal/Exponential): `opow_le_of_isSuccLimit` works for `c ≠ 0` |
When `IsSuccLimit b`, `a ^ b ≤ c ↔ ∀ b' < b, a ^ b' ≤ c` holds unless `a = c = 0`.
(otherwise the LHS is true but the RHS is false because `b' = 0` requires `0 ^ 0 ≤ 0`)
We have this lemma for `a ≠ 0`, and this adds it for `c ≠ 0`.
---
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|
t-set-theory |
14/0 |
Mathlib/SetTheory/Ordinal/Exponential.lean |
1 |
2 |
['github-actions', 'vihdzp'] |
alreadydone assignee:alreadydone |
9-6089 9 days ago |
12-73395 12 days ago |
12-73388 12 days |
0 |
| 44586 |
dagurtomas author:dagurtomas |
feat(CategoryTheory/Limits): countable limits from finite and sequential limits |
Show that countable cofiltered limits can be computed as sequential limits, and that finite limits plus sequential limits give all countable limits; prove the dual colimit statements. Construct countable directed presentations using Deligne's finite diagrams, and name the general dual result `IsCofiltered.exists_codirected`. The countable presentations and limit constructions live in separate files. This supersedes #44534 and resolves the entire countable-limit `proof_wanted` series, correcting the last statement's sequential-colimit hypothesis.
|
LLM-generated
t-category-theory
file-removed
|
214/67 |
Mathlib.lean,Mathlib/CategoryTheory/Countable.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Filtered/Countable.lean,Mathlib/CategoryTheory/Limits/Constructions/Countable.lean,Mathlib/CategoryTheory/Limits/Shapes/Countable.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean,Mathlib/CategoryTheory/Presentable/Directed.lean,Wanted.lean,Wanted/CategoryTheory/Limits/Shapes/Countable.lean |
10 |
2 |
['dagurtomas', 'github-actions'] |
robin-carlier assignee:robin-carlier |
9-6088 9 days ago |
9-47681 9 days ago |
9-47674 9 days |
0 |
| 44490 |
staroperator author:staroperator |
feat(Order/Preorder/Chain): add `IsLEChain` and `IsLTChain` abbreviations |
`IsLEChain` and `IsLTChain` are abbreviations for `IsChain (· ≤ ·)` and `IsChain (· < ·)`. The motivation to add new abbreviations includes:
- canonizing `to_dual` translation (currently `IsChain (· ≤ ·)` are translated into `IsChain (· ≥ ·)`, which is equivalent via `IsChain.symm`)
- separating properties of `≤`-chain and `<`-chain under different namespaces (they are not equivalent in preorders, the former is strictly weaker, and the latter correspond to linearly ordered subsets)
- (maybe) promoting the use of `<`-chain
Feel free to discuss the design in [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Order.20dual.20tactic/near/628982679).
As a TODO, Zorn's lemmas can be reproved under `<`-chains, which are more general in preorders.
This PR does not add `IsMaxLEChain` for `IsMaxChain (· ≤ ·)`, considering they only have 10 usages so far, mainly associated with `Flag`.
This PR adds `to_dual` to [`IsCoatomic.of_isChain_bounded`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/ZornAtoms.html#IsCoatomic.of_isChain_bounded). It also changes the signatures of existing [`zorn_ge`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/Zorn.html#zorn_ge) etc. from `IsChain (· ≥ ·)` into `IsChain (· ≤ ·)`.
---
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|
t-order |
186/128 |
Counterexamples/AharoniKorman.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Data/Fin/FlagRange.lean,Mathlib/FieldTheory/Extension.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/LinearAlgebra/Basis/Flag.lean,Mathlib/Order/BourbakiWitt.lean,Mathlib/Order/Extension/Linear.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,Mathlib/Order/OrderIsoNat.lean,Mathlib/Order/Preorder/Chain.lean,Mathlib/Order/Zorn.lean,Mathlib/Order/ZornAtoms.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Basic.lean,Mathlib/RingTheory/Ideal/Oka.lean,Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/UniqueFactorizationDomain/Kaplansky.lean,Mathlib/SetTheory/Cardinal/EventuallyConst.lean,Mathlib/Topology/ShrinkingLemma.lean |
22 |
6 |
['github-actions', 'staroperator', 'vihdzp'] |
nobody |
9-5341 9 days ago |
9-7575 9 days ago |
12-18343 12 days |
2 |
| 40204 |
Jun2M author:Jun2M |
feat(Combinatorics/HypergraphLike): add HypergraphLike class |
Introduces `HypergraphLike V I E Gr`, an incidence interface for developing common graph theory across graph and hypergraph representations, including `SimpleGraph`, `Graph`, and `Digraph`.
The class specifies sets of vertices, edges, and incidences within ambient label types, with maps assigning each incidence an edge and a vertex. Each incidence is a source, a target, or both, allowing directed and undirected incidences in the same structure. Distinct incidences may belong to the same vertex and edge.
`Link G e u v` records two distinct incidences witnessing a traversal of `e` from `u` to `v`. Requiring distinct incidences prevents traversing an undirected edge back through the incidence used to enter it. `IsLink` expresses the existence of a link, and `Adj` the existence of an edge linking two vertices.
The basic API includes the incidence maps `attach` and `edgeMap`, the fibers `edgeFiber` and `vertexFiber`, and the sets `incVerts` and `incEdges` of incident vertices and edges. It provides membership characterizations, fiber disjointness and union identities, and their relationships with links and adjacency.
Related: #36743 and the [HasAdj discussion](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/HasAdj/with/575843445).
Codex assisted with the initial implementation and review, and revised by me.
Co-authored-by: OpenAI Codex <codex@openai.com>
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics
LLM-generated
maintainer-merge
|
453/0 |
Mathlib.lean,Mathlib/Combinatorics/HypergraphLike/Basic.lean |
2 |
43 |
['Jun2M', 'SnirBroshi', 'YaelDillies', 'copilot-pull-request-reviewer', 'github-actions', 'tb65536'] |
nobody |
9-1116 9 days ago |
10-80663 10 days ago |
105-28958 105 days |
9 |
| 43948 |
JX-Mo author:JX-Mo |
chore(RepresentationTheory/Coinduced): tech debt |
Remove five `backward.isDefEq.respectTransparency.types` and add a CoeFun instance for `coindV` to justify the existing `coe`-named lemmas.
https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60CoeFun.60.20or.20.60.2Eval.60/with/630026437 |
t-algebra
tech debt
easy
label:t-algebra$ |
22/17 |
Mathlib/RepresentationTheory/Coinduced.lean |
1 |
37 |
['JX-Mo', 'Whysoserioushah', 'github-actions', 'jcommelin', 'jjdishere', 'leanprover-radar', 'mathlib-bors'] |
nobody |
8-79630 8 days ago |
11-59389 11 days ago |
14-38573 14 days |
4 |
| 44629 |
kebekus author:kebekus |
feat: behavior of order in polymomial expressions of meromorphic functions |
Establish standard formulae for the behavior of order in finite sums and polynomial expressions of meromorphic functions.
This material is used in [Project VD](https://github.com/kebekus/ProjectVD), formalizing Value Distribution Theory for meromorphic functions on the complex plane. Claude Code was used to create this PR.
---
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|
t-analysis
LLM-generated
|
223/0 |
Mathlib/Analysis/Meromorphic/Divisor.lean,Mathlib/Analysis/Meromorphic/Order.lean |
2 |
1 |
['github-actions'] |
nobody |
8-76000 8 days ago |
8-76004 8 days ago |
8-75997 8 days |
0 |
| 44075 |
bjornsolheim author:bjornsolheim |
feat(Analysis/Convex): convex hull of a compact set is compact in finite dimensions |
Proves the following:
`Set.convexHull_eq_range_sum_smul` - In finite dimensions, the convex hull of `K` is the range of weighted sums of
`finrank 𝕜 E + 1` points of `K`, with nonnegative weights summing to one.
`IsCompact.convexHull` - In finite dimensions, the convex hull of a compact set is compact.
Assisted by: Claude Fable 5.1 (used for research and to write or complete or improve some parts).
Some parts are hence iteratively llm-generated based on my inputs. All lines are reviewed in full by me.
---
[](https://gitpod.io/from-referrer/)
|
t-analysis |
84/0 |
Mathlib.lean,Mathlib/Analysis/Convex/Compact.lean |
2 |
1 |
['github-actions'] |
nobody |
8-64550 8 days ago |
24-48052 24 days ago |
24-48045 24 days |
1 |
| 35561 |
Thmoas-Guan author:Thmoas-Guan |
feat(RingTheory): power series over regular local ring |
In this PR, we proved that power series over regular local ring is again regular local ring.
Same for finite multivariable power series.
---
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Second, co-authors can also be listed in lines at the very bottom of
the commit message (that is, directly before the `---`) using the following format:
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If you are moving or deleting declarations, please include these lines
at the bottom of the commit message (before the `---`, and also before
any "Co-authored-by" lines) using the following format:
Moves:
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- ...
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Any other comments you want to keep out of the PR commit should go
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-->
- [x] depends on: #28682
[](https://gitpod.io/from-referrer/)
|
t-ring-theory |
70/0 |
Mathlib.lean,Mathlib/RingTheory/RegularLocalRing/PowerSeries.lean |
2 |
6 |
['github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
8-51911 8 days ago |
41-83463 41 days ago |
52-38029 52 days |
1 |
| 44548 |
emlis42 author:emlis42 |
feat(Tactic/Inclusion): add sqrt support to the `inclusion`/`dyadic_interval` tactic |
This PR adds a `sqrt` extension for the `dyadic_interval` tactic.
---
I used an LLM for golfing. |
t-meta
large-import
|
108/0 |
Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Inclusion/Extension/IntervalDyadicReal/Sqrt.lean,Mathlib/Tactic/Inclusion/Extension/IntervalDyadicReal/Tactic.lean,MathlibTest/Tactic/Inclusion/Basic.lean |
5 |
2 |
['emlis42', 'github-actions'] |
nobody |
8-48508 8 days ago |
9-82514 9 days ago |
9-82507 9 days |
0 |
| 44619 |
artie2000 author:artie2000 |
refactor(Algebra/Ring): rename IsSemireal property |
* Rename field `IsSemireal.one_add_ne_zero` to the more descriptive `IsSemireal.one_add_ne_zero_of_isSumSq`.
---
<!-- Your PR title will become the first line of the commit message.
In this box, the text above the `---` (if not empty) will be appended
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will format the text above it as a title.
For details on the "pull request lifecycle" in mathlib, please see:
https://leanprover-community.github.io/contribute/index.html
In particular, note that most reviewers will only notice your PR
if it passes the continuous integration checks.
Please ask for help on https://leanprover.zulipchat.com if needed.
When merging, all the commits will be squashed into a single commit
listing all co-authors.
Co-authors in the squash commit are gathered from two sources:
First, all authors of commits to this PR branch are included. Thus,
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each co-author among the commits in the pull request. If necessary, you
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-->
|
t-algebra label:t-algebra$ |
10/5 |
Mathlib/Algebra/Ring/Semireal/Defs.lean |
1 |
3 |
['SnirBroshi', 'artie2000', 'github-actions', 'vihdzp'] |
nobody |
8-46047 8 days ago |
9-1956 9 days ago |
9-14051 9 days |
0 |
| 44502 |
dependabot author:dependabot |
chore(deps): bump the actions-version-updates group across 1 directory with 7 updates |
Bumps the actions-version-updates group with 7 updates in the /.github/workflows directory:
| Package | From | To |
| --- | --- | --- |
| [reviewdog/action-actionlint](https://github.com/reviewdog/action-actionlint) | `1.73.0` | `1.79.1` |
| [docker/build-push-action](https://github.com/docker/build-push-action) | `7.3.0` | `7.4.0` |
| [actions/attest-build-provenance](https://github.com/actions/attest-build-provenance) | `4.1.1` | `4.2.2` |
| [corentinmusard/otel-cicd-action](https://github.com/corentinmusard/otel-cicd-action) | `4.1.0` | `4.2.0` |
| [actions/cache](https://github.com/actions/cache) | `5.1.0` | `6.1.0` |
| [pre-commit-ci/lite-action](https://github.com/pre-commit-ci/lite-action) | `1.1.0` | `1.2.0` |
| [softprops/action-gh-release](https://github.com/softprops/action-gh-release) | `3.0.2` | `3.0.3` |
Updates `reviewdog/action-actionlint` from 1.73.0 to 1.79.1
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/reviewdog/action-actionlint/releases">reviewdog/action-actionlint's releases</a>.</em></p>
<blockquote>
<h2>Release v1.79.1</h2>
<h2>What's Changed</h2>
<ul>
<li>chore(deps): update python:3.14.8-alpine3.24 docker digest to f6a589d by <a href="https://github.com/renovate"><code>@renovate</code></a>[bot] in <a href="https://redirect.github.com/reviewdog/action-actionlint/pull/249">reviewdog/action-actionlint#249</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/reviewdog/action-actionlint/compare/v1.79.0...v1.79.1">https://github.com/reviewdog/action-actionlint/compare/v1.79.0...v1.79.1</a></p>
<h2>Release v1.79.0</h2>
<h2>What's Changed</h2>
<ul>
<li>chore(deps): update dependency pyflakes to v4.0.2 by <a href="https://github.com/renovate"><code>@renovate</code></a>[bot] in <a href="https://redirect.github.com/reviewdog/action-actionlint/pull/248">reviewdog/action-actionlint#248</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/reviewdog/action-actionlint/compare/v1.78.1...v1.79.0">https://github.com/reviewdog/action-actionlint/compare/v1.78.1...v1.79.0</a></p>
<h2>Release v1.78.1</h2>
<h2>What's Changed</h2>
<ul>
<li>chore(deps): update python docker tag to v3.14.8 by <a href="https://github.com/renovate"><code>@renovate</code></a>[bot] in <a href="https://redirect.github.com/reviewdog/action-actionlint/pull/247">reviewdog/action-actionlint#247</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/reviewdog/action-actionlint/compare/v1.78.0...v1.78.1">https://github.com/reviewdog/action-actionlint/compare/v1.78.0...v1.78.1</a></p>
<h2>Release v1.78.0</h2>
<h2>What's Changed</h2>
<ul>
<li>chore(deps): update shogo82148/actions-create-release action to v1.9.2 by <a href="https://github.com/renovate"><code>@renovate</code></a>[bot] in <a href="https://redirect.github.com/reviewdog/action-actionlint/pull/245">reviewdog/action-actionlint#245</a></li>
<li>chore(deps): update dependency pyflakes to v4.0.1 by <a href="https://github.com/renovate"><code>@renovate</code></a>[bot] in <a href="https://redirect.github.com/reviewdog/action-actionlint/pull/246">reviewdog/action-actionlint#246</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/reviewdog/action-actionlint/compare/v1.77.0...v1.78.0">https://github.com/reviewdog/action-actionlint/compare/v1.77.0...v1.78.0</a></p>
<h2>Release v1.77.0</h2>
<h2>What's Changed</h2>
<ul>
<li>chore(deps): update dependency pyflakes to v4 by <a href="https://github.com/renovate"><code>@renovate</code></a>[bot] in <a href="https://redirect.github.com/reviewdog/action-actionlint/pull/244">reviewdog/action-actionlint#244</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/reviewdog/action-actionlint/compare/v1.76.3...v1.77.0">https://github.com/reviewdog/action-actionlint/compare/v1.76.3...v1.77.0</a></p>
<h2>Release v1.76.3</h2>
<h2>What's Changed</h2>
<ul>
<li>fix: preserve quoted spaces in actionlint/reviewdog flags by <a href="https://github.com/shogo82148"><code>@shogo82148</code></a> in <a href="https://redirect.github.com/reviewdog/action-actionlint/pull/243">reviewdog/action-actionlint#243</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/reviewdog/action-actionlint/compare/v1.76.2...v1.76.3">https://github.com/reviewdog/action-actionlint/compare/v1.76.2...v1.76.3</a></p>
<h2>Release v1.76.2</h2>
<h2>What's Changed</h2>
<ul>
<li>fix: preserve actionlint operational exit codes (2, 3) by <a href="https://github.com/shogo82148"><code>@shogo82148</code></a> in <a href="https://redirect.github.com/reviewdog/action-actionlint/pull/242">reviewdog/action-actionlint#242</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/reviewdog/action-actionlint/compare/v1.76.1...v1.76.2">https://github.com/reviewdog/action-actionlint/compare/v1.76.1...v1.76.2</a></p>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/reviewdog/action-actionlint/commit/1758727be30241166609dad4c97588b6ad411f32"><code>1758727</code></a> bump v1.79.1</li>
<li><a href="https://github.com/reviewdog/action-actionlint/commit/835705a91b2e078dc7db0d18faf6c60aa826436d"><code>835705a</code></a> Merge branch 'main' into releases/v1</li>
<li><a href="https://github.com/reviewdog/action-actionlint/commit/2b6687f7f9d077738045bb954efe4ab43fbf7a16"><code>2b6687f</code></a> Merge pull request <a href="https://redirect.github.com/reviewdog/action-actionlint/issues/249">#249</a> from reviewdog/renovate/python-3.14.8-alpine3.24</li>
<li><a href="https://github.com/reviewdog/action-actionlint/commit/91d36b3cdd5c848d7337a6c41efb0b1bd8868a3c"><code>91d36b3</code></a> chore(deps): update python:3.14.8-alpine3.24 docker digest to f6a589d</li>
<li><a href="https://github.com/reviewdog/action-actionlint/commit/a1e3e7ff7b1f7554e043f455cc78803e773c4a88"><code>a1e3e7f</code></a> bump v1.79.0</li>
<li><a href="https://github.com/reviewdog/action-actionlint/commit/0a63bd870331c1558f2104bb737169a4c4b7b591"><code>0a63bd8</code></a> Merge branch 'main' into releases/v1</li>
<li><a href="https://github.com/reviewdog/action-actionlint/commit/e3350d1193be1550970a529a41806e379ac2272c"><code>e3350d1</code></a> Merge pull request <a href="https://redirect.github.com/reviewdog/action-actionlint/issues/248">#248</a> from reviewdog/renovate/pyflakes-4.x</li>
<li><a href="https://github.com/reviewdog/action-actionlint/commit/063aab8f1f64254392219f5e08b6eb846eb1ad50"><code>063aab8</code></a> chore(deps): update dependency pyflakes to v4.0.2</li>
<li><a href="https://github.com/reviewdog/action-actionlint/commit/13465d022aa41c282f730be17574b5ce692d0186"><code>13465d0</code></a> bump v1.78.1</li>
<li><a href="https://github.com/reviewdog/action-actionlint/commit/b1c48c4cdb2d458a1563603033f2e68b627f3726"><code>b1c48c4</code></a> Merge branch 'main' into releases/v1</li>
<li>Additional commits viewable in <a href="https://github.com/reviewdog/action-actionlint/compare/50842263c20a7c46bd0065b9e624d3c569db061e...1758727be30241166609dad4c97588b6ad411f32">compare view</a></li>
</ul>
</details>
<br />
Updates `docker/build-push-action` from 7.3.0 to 7.4.0
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/docker/build-push-action/releases">docker/build-push-action's releases</a>.</em></p>
<blockquote>
<h2>v7.4.0</h2>
<ul>
<li>Use the shared error helper for Buildx commands by <a href="https://github.com/crazy-max"><code>@crazy-max</code></a> in <a href="https://redirect.github.com/docker/build-push-action/pull/1620">docker/build-push-action#1620</a></li>
<li>Prevent workflow command injection in metadata logs by <a href="https://github.com/crazy-max"><code>@crazy-max</code></a> in <a href="https://redirect.github.com/docker/build-push-action/pull/1617">docker/build-push-action#1617</a></li>
<li>Bump <code>@docker/actions-toolkit</code> from 0.92.0 to 0.100.0 in <a href="https://redirect.github.com/docker/build-push-action/pull/1614">docker/build-push-action#1614</a> <a href="https://redirect.github.com/docker/build-push-action/pull/1618">docker/build-push-action#1618</a> <a href="https://redirect.github.com/docker/build-push-action/pull/1621">docker/build-push-action#1621</a></li>
<li>Bump <code>@humanfs/node</code> from 0.16.7 to 0.16.8 in <a href="https://redirect.github.com/docker/build-push-action/pull/1609">docker/build-push-action#1609</a></li>
<li>Bump brace-expansion from 1.1.13 to 1.1.18 in <a href="https://redirect.github.com/docker/build-push-action/pull/1592">docker/build-push-action#1592</a></li>
<li>Bump csv-parse from 7.0.0 to 7.0.2 in <a href="https://redirect.github.com/docker/build-push-action/pull/1613">docker/build-push-action#1613</a></li>
<li>Bump js-yaml from 4.3.0 to 4.3.2 in <a href="https://redirect.github.com/docker/build-push-action/pull/1605">docker/build-push-action#1605</a> <a href="https://redirect.github.com/docker/build-push-action/pull/1615">docker/build-push-action#1615</a></li>
<li>Bump nanoid from 3.3.16 to 3.3.18 in <a href="https://redirect.github.com/docker/build-push-action/pull/1611">docker/build-push-action#1611</a></li>
<li>Bump postcss from 8.5.10 to 8.5.25 in <a href="https://redirect.github.com/docker/build-push-action/pull/1590">docker/build-push-action#1590</a></li>
<li>Bump postcss-selector-parser from 7.1.1 to 7.1.5 in <a href="https://redirect.github.com/docker/build-push-action/pull/1606">docker/build-push-action#1606</a></li>
<li>Bump sigstore from 4.1.0 to 4.1.1 in <a href="https://redirect.github.com/docker/build-push-action/pull/1577">docker/build-push-action#1577</a></li>
<li>Bump undici from 6.27.0 to 6.28.0 in <a href="https://redirect.github.com/docker/build-push-action/pull/1594">docker/build-push-action#1594</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/docker/build-push-action/compare/v7.3.0...v7.4.0">https://github.com/docker/build-push-action/compare/v7.3.0...v7.4.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/docker/build-push-action/commit/c3c9e263c25d99ce0380d002d59b67737d91b0dc"><code>c3c9e26</code></a> Merge pull request <a href="https://redirect.github.com/docker/build-push-action/issues/1621">#1621</a> from docker/dependabot/npm_and_yarn/docker/actions-t...</li>
<li><a href="https://github.com/docker/build-push-action/commit/459b6741834dcd35f946352017e7675bd2089d42"><code>459b674</code></a> [dependabot skip] chore: update generated content</li>
<li><a href="https://github.com/docker/build-push-action/commit/4dedcb23c91d79c1629bf53ec2c3bcfffef5b34e"><code>4dedcb2</code></a> chore(deps): Bump <code>@docker/actions-toolkit</code> from 0.99.0 to 0.100.0</li>
<li><a href="https://github.com/docker/build-push-action/commit/379bf63a979bd70751945601fa04c50674509952"><code>379bf63</code></a> Merge pull request <a href="https://redirect.github.com/docker/build-push-action/issues/1620">#1620</a> from crazy-max/buildx-error-message</li>
<li><a href="https://github.com/docker/build-push-action/commit/9877975c9e0b0b661592ff61049069507f9bc2f6"><code>9877975</code></a> chore: update generated content</li>
<li><a href="https://github.com/docker/build-push-action/commit/7ed0556ffafb8eb312463411ef0a84a1dfe24d94"><code>7ed0556</code></a> use the shared Buildx error summary helper</li>
<li><a href="https://github.com/docker/build-push-action/commit/91670ba5a4df99a24efff8637a78c83fd1b0f6b1"><code>91670ba</code></a> Merge pull request <a href="https://redirect.github.com/docker/build-push-action/issues/1618">#1618</a> from docker/dependabot/npm_and_yarn/docker/actions-t...</li>
<li><a href="https://github.com/docker/build-push-action/commit/80dbc8614a5c0ce4356740f69179cf829ecdc79a"><code>80dbc86</code></a> [dependabot skip] chore: update generated content</li>
<li><a href="https://github.com/docker/build-push-action/commit/50cac3a3b6f55e6015d6483d1dd72a3ecb90d20d"><code>50cac3a</code></a> chore(deps): Bump <code>@docker/actions-toolkit</code> from 0.98.0 to 0.99.0</li>
<li><a href="https://github.com/docker/build-push-action/commit/03b4d6cac0163b44733e1fa60adfd6da560ee4d1"><code>03b4d6c</code></a> Merge pull request <a href="https://redirect.github.com/docker/build-push-action/issues/1617">#1617</a> from crazy-max/fix-metadata-workflow-commands</li>
<li>Additional commits viewable in <a href="https://github.com/docker/build-push-action/compare/53b7df96c91f9c12dcc8a07bcb9ccacbed38856a...c3c9e263c25d99ce0380d002d59b67737d91b0dc">compare view</a></li>
</ul>
</details>
<br />
Updates `actions/attest-build-provenance` from 4.1.1 to 4.2.2
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/actions/attest-build-provenance/releases">actions/attest-build-provenance's releases</a>.</em></p>
<blockquote>
<h2>v4.2.2</h2>
<blockquote>
<p>[!NOTE]
As of version 4, <code>actions/attest-build-provenance</code> is simply a wrapper on top of <a href="https://github.com/actions/attest"><code>actions/attest</code></a>.</p>
<p>Existing applications may continue to use the <code>attest-build-provenance</code> action, but new implementations should use <code>actions/attest</code> instead.</p>
</blockquote>
<h2>What's Changed</h2>
<ul>
<li>Bump actions/attest from 4.2.0 to 4.2.1 in the actions-minor group by <a href="https://github.com/dependabot"><code>@dependabot</code></a>[bot] in <a href="https://redirect.github.com/actions/attest-build-provenance/pull/862">actions/attest-build-provenance#862</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/actions/attest-build-provenance/compare/v4.1.1...v4.2.2">https://github.com/actions/attest-build-provenance/compare/v4.1.1...v4.2.2</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/actions/attest-build-provenance/commit/4d101475d8b20a2381f78447822ac1eab6504dd8"><code>4d10147</code></a> Bump actions/attest from 4.2.0 to 4.2.1 in the actions-minor group (<a href="https://redirect.github.com/actions/attest-build-provenance/issues/862">#862</a>)</li>
<li><a href="https://github.com/actions/attest-build-provenance/commit/e3fe62ef559997059fe8380e7d2b4c909e2d65f4"><code>e3fe62e</code></a> Bump the actions-minor group with 2 updates (<a href="https://redirect.github.com/actions/attest-build-provenance/issues/860">#860</a>)</li>
<li>See full diff in <a href="https://github.com/actions/attest-build-provenance/compare/0f67c3f4856b2e3261c31976d6725780e5e4c373...4d101475d8b20a2381f78447822ac1eab6504dd8">compare view</a></li>
</ul>
</details>
<br />
Updates `corentinmusard/otel-cicd-action` from 4.1.0 to 4.2.0
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/corentinmusard/otel-cicd-action/releases">corentinmusard/otel-cicd-action's releases</a>.</em></p>
<blockquote>
<h2>v4.2.0</h2>
<h3>Changed</h3>
<ul>
<li>Switch top-level pipeline run span kind from <code>INTERNAL</code> to <code>SERVER</code>, according to
OTel semconv: <a href="https://opentelemetry.io/docs/specs/semconv/cicd/cicd-spans/#pipeline-run">https://opentelemetry.io/docs/specs/semconv/cicd/cicd-spans/#pipeline-run</a></li>
</ul>
<h2>v4.1.1</h2>
<h3>Changed</h3>
<ul>
<li>CICD: skip the sourcemap when diffing dist. Streaming its diff to the job log dominated
the Validate dist step, pushing the build job to nearly ten minutes on a stale-bundle failure.</li>
<li>Build: rebuild dist for undici 6.28.0. Dependabot only updates package-lock.json,
but undici is a runtime dependency that rollup inlines into the committed bundle.</li>
<li>Editorial: Use Dash0 endpoints in README examples.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/dash0hq/otel-cicd-action/blob/main/CHANGELOG.md">corentinmusard/otel-cicd-action's changelog</a>.</em></p>
<blockquote>
<h1>Changelog</h1>
<p>All notable changes to this project will be documented in this file.</p>
<p>The format is based on <a href="https://keepachangelog.com/en/1.1.0/">Keep a Changelog</a>,
and this project adheres to <a href="https://semver.org/spec/v2.0.0.html">Semantic Versioning</a>.</p>
<h2>[Unreleased]</h2>
<h2>[4.2.0] - 2026-09-18</h2>
<h3>Changed</h3>
<ul>
<li>Switch top-level pipeline run span kind from <code>INTERNAL</code> to <code>SERVER</code>, according to
OTel semconv: <a href="https://opentelemetry.io/docs/specs/semconv/cicd/cicd-spans/#pipeline-run">https://opentelemetry.io/docs/specs/semconv/cicd/cicd-spans/#pipeline-run</a></li>
</ul>
<h2>[4.1.1] - 2026-08-14</h2>
<h3>Changed</h3>
<ul>
<li>CICD: skip the sourcemap when diffing dist. Streaming its diff to the job log dominated
the Validate dist step, pushing the build job to nearly ten minutes on a stale-bundle failure.</li>
<li>Build: rebuild dist for undici 6.28.0. Dependabot only updates package-lock.json,
but undici is a runtime dependency that rollup inlines into the committed bundle.</li>
<li>Editorial: Use Dash0 endpoints in README examples.</li>
</ul>
<h2>[4.1.0] - 2026-07-27</h2>
<h3>Added</h3>
<ul>
<li>Added the <code>otlpInsecureSkipVerify</code> input for exporting to trusted internal OTLP endpoints whose
TLS certificates cannot be verified.
Thanks <a href="https://github.com/OneCyrus"><code>@OneCyrus</code></a>!</li>
</ul>
<h3>Changed</h3>
<ul>
<li>
<p>Span status now follows the OpenTelemetry
<a href="https://opentelemetry.io/docs/specs/semconv/general/recording-errors/">recording-errors</a>
conventions: it is set to <code>Error</code> (with the standard <code>error.type</code> attribute) for the
<code>failure</code>, <code>timed_out</code>, and <code>startup_failure</code> conclusions, and left unset otherwise
(previously it was set to <code>Ok</code> on success and <code>Error</code> only for <code>failure</code>).</p>
</li>
<li>
<p><strong>Removed</strong> the non-standard boolean <code>error</code> attribute from workflow, job, and step spans.
Use the span status or the <code>error.type</code> attribute instead.</p>
</li>
<li>
<p>The <code>github.job.labels</code> attribute is now exported as an array of strings instead of a
comma-separated string, consistent with the PR label attributes.</p>
</li>
<li>
<p>The repository was transferred from <code>corentinmusard/otel-cicd-action</code> to
<a href="https://github.com/dash0hq/otel-cicd-action"><code>dash0hq/otel-cicd-action</code></a> and is now maintained
by <a href="https://www.dash0.com">Dash0</a>. Existing <code>uses: corentinmusard/otel-cicd-action@v4</code> references
keep working via GitHub's redirect, but updating to <code>dash0hq/otel-cicd-action@v4</code> is recommended.</p>
</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/dash0hq/otel-cicd-action/commit/4826b79d63662fa91657272e7711420cb6aea543"><code>4826b79</code></a> chore: prepare release v4.2.0</li>
<li><a href="https://github.com/dash0hq/otel-cicd-action/commit/83ec6673ab6c824b086ded7b783f84a2e85774cc"><code>83ec667</code></a> Include PR <a href="https://redirect.github.com/corentinmusard/otel-cicd-action/issues/92">#92</a> to the CHANGELOG prior to releasing. (<a href="https://redirect.github.com/corentinmusard/otel-cicd-action/issues/95">#95</a>)</li>
<li><a href="https://github.com/dash0hq/otel-cicd-action/commit/d9c656c55c721288839dfb33d485272859506436"><code>d9c656c</code></a> fix: switch pipeline run span kind from <code>INTERNAL</code> to <code>SERVER</code> (<a href="https://redirect.github.com/corentinmusard/otel-cicd-action/issues/92">#92</a>)</li>
<li><a href="https://github.com/dash0hq/otel-cicd-action/commit/895874bfae14f840e3032f1a14c3f2b45c93f4af"><code>895874b</code></a> chore: prepare release v4.1.1 (<a href="https://redirect.github.com/corentinmusard/otel-cicd-action/issues/90">#90</a>)</li>
<li><a href="https://github.com/dash0hq/otel-cicd-action/commit/f6952e3b6c9f2e03aa1f9d2b161fa6a6a0a96263"><code>f6952e3</code></a> chore: update CHANGELOG with editorial/build/cicd updates. (<a href="https://redirect.github.com/corentinmusard/otel-cicd-action/issues/89">#89</a>)</li>
<li><a href="https://github.com/dash0hq/otel-cicd-action/commit/77885591de01eecfd4c5d7efa78006ce8fd9044f"><code>7788559</code></a> ci: skip the sourcemap when diffing dist</li>
<li><a href="https://github.com/dash0hq/otel-cicd-action/commit/46633641d19b828dc18d037ca6cd53e29dd0e2c5"><code>4663364</code></a> build: rebuild dist for undici 6.28.0</li>
<li><a href="https://github.com/dash0hq/otel-cicd-action/commit/31e4d4b3334b0eb76e7599441ab4475f8931e65b"><code>31e4d4b</code></a> build(deps): bump the npm_and_yarn group across 1 directory with 2 updates</li>
<li><a href="https://github.com/dash0hq/otel-cicd-action/commit/85d7618854e54f909adad504d6233c1dfed19b87"><code>85d7618</code></a> Use Dash0 endpoints in README examples, drop competitor links from website docs</li>
<li><a href="https://github.com/dash0hq/otel-cicd-action/commit/02e43cc25881ba326ebed7bd6b68f737d73c34d3"><code>02e43cc</code></a> chore: drop repository badges from the synced website docs (<a href="https://redirect.github.com/corentinmusard/otel-cicd-action/issues/85">#85</a>)</li>
<li>See full diff in <a href="https://github.com/corentinmusard/otel-cicd-action/compare/6022e68732c1cab4d2c8218b810f69006ee5cc34...4826b79d63662fa91657272e7711420cb6aea543">compare view</a></li>
</ul>
</details>
<br />
Updates `actions/cache` from 5.1.0 to 6.1.0
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/actions/cache/releases">actions/cache's releases</a>.</em></p>
<blockquote>
<h2>v6.1.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Bump <code>@actions/cache</code> to v6.1.0 - handle read-only cache access by <a href="https://github.com/jasongin"><code>@jasongin</code></a> in <a href="https://redirect.github.com/actions/cache/pull/1768">actions/cache#1768</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/actions/cache/compare/v6...v6.1.0">https://github.com/actions/cache/compare/v6...v6.1.0</a></p>
<h2>v6.0.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Update packages, migrate to ESM by <a href="https://github.com/Samirat"><code>@Samirat</code></a> in <a href="https://redirect.github.com/actions/cache/pull/1760">actions/cache#1760</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/actions/cache/compare/v5...v6.0.0">https://github.com/actions/cache/compare/v5...v6.0.0</a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/actions/cache/blob/main/RELEASES.md">actions/cache's changelog</a>.</em></p>
<blockquote>
<h1>Releases</h1>
<h2>How to prepare a release</h2>
<blockquote>
<p>[!NOTE]
Relevant for maintainers with write access only.</p>
</blockquote>
<ol>
<li>Switch to a new branch from <code>main</code>.</li>
<li>Run <code>npm test</code> to ensure all tests are passing.</li>
<li>Update the version in <a href="https://github.com/actions/cache/blob/main/package.json"><code>https://github.com/actions/cache/blob/main/package.json</code></a>.</li>
<li>Run <code>npm run build</code> to update the compiled files.</li>
<li>Update this <a href="https://github.com/actions/cache/blob/main/RELEASES.md"><code>https://github.com/actions/cache/blob/main/RELEASES.md</code></a> with the new version and changes in the <code>## Changelog</code> section.</li>
<li>Run <code>licensed cache</code> to update the license report.</li>
<li>Run <code>licensed status</code> and resolve any warnings by updating the <a href="https://github.com/actions/cache/blob/main/.licensed.yml"><code>https://github.com/actions/cache/blob/main/.licensed.yml</code></a> file with the exceptions.</li>
<li>Commit your changes and push your branch upstream.</li>
<li>Open a pull request against <code>main</code> and get it reviewed and merged.</li>
<li>Draft a new release <a href="https://github.com/actions/cache/releases">https://github.com/actions/cache/releases</a> use the same version number used in <code>package.json</code>
<ol>
<li>Create a new tag with the version number.</li>
<li>Auto generate release notes and update them to match the changes you made in <code>RELEASES.md</code>.</li>
<li>Toggle the set as the latest release option.</li>
<li>Publish the release.</li>
</ol>
</li>
<li>Navigate to <a href="https://github.com/actions/cache/actions/workflows/release-new-action-version.yml">https://github.com/actions/cache/actions/workflows/release-new-action-version.yml</a>
<ol>
<li>There should be a workflow run queued with the same version number.</li>
<li>Approve the run to publish the new version and update the major tags for this action.</li>
</ol>
</li>
</ol>
<h2>Changelog</h2>
<h3>6.1.0</h3>
<ul>
<li>Bump <code>@actions/cache</code> to v6.1.0 to pick up <a href="https://redirect.github.com/actions/toolkit/pull/2435">actions/toolkit#2435 Handle cache write error due to read-only token</a></li>
<li>Switch redundant "Cache save failed" warning to debug log in save-only</li>
</ul>
<h3>6.0.0</h3>
<ul>
<li>Updated <code>@actions/cache</code> to ^6.0.1, <code>@actions/core</code> to ^3.0.1, <code>@actions/exec</code> to ^3.0.0, <code>@actions/io</code> to ^3.0.2</li>
<li>Migrated to ESM module system</li>
<li>Upgraded Jest to v30 and test infrastructure to be ESM compatible</li>
</ul>
<h3>5.0.4</h3>
<ul>
<li>Bump <code>minimatch</code> to v3.1.5 (fixes ReDoS via globstar patterns)</li>
<li>Bump <code>undici</code> to v6.24.1 (WebSocket decompression bomb protection, header validation fixes)</li>
<li>Bump <code>fast-xml-parser</code> to v5.5.6</li>
</ul>
<h3>5.0.3</h3>
<ul>
<li>Bump <code>@actions/cache</code> to v5.0.5 (Resolves: <a href="https://github.com/actions/cache/security/dependabot/33">https://github.com/actions/cache/security/dependabot/33</a>)</li>
<li>Bump <code>@actions/core</code> to v2.0.3</li>
</ul>
<h3>5.0.2</h3>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/actions/cache/commit/55cc8345863c7cc4c66a329aec7e433d2d1c52a9"><code>55cc834</code></a> Merge pull request <a href="https://redirect.github.com/actions/cache/issues/1768">#1768</a> from jasongin/readonly-cache</li>
<li><a href="https://github.com/actions/cache/commit/d8cd72f230726cdf4457ebb61ec1b593a8d12337"><code>d8cd72f</code></a> Bump <code>@actions/cache</code> to v6.1.0 - handle cache write error due to RO token</li>
<li><a href="https://github.com/actions/cache/commit/2c8a9bd7457de244a408f35966fab2fb45fda9c8"><code>2c8a9bd</code></a> Merge pull request <a href="https://redirect.github.com/actions/cache/issues/1760">#1760</a> from actions/samirat/esm_migration_and_package_update</li>
<li><a href="https://github.com/actions/cache/commit/e9b91fdc3fea7d79165fceb79042ef45c2d51023"><code>e9b91fd</code></a> Prettier fixes</li>
<li><a href="https://github.com/actions/cache/commit/e4884b8ff7f92ef6b52c79eda480bbc86e685adb"><code>e4884b8</code></a> Rebuild dist</li>
<li><a href="https://github.com/actions/cache/commit/10baf0191a3c426ea0fa4a3253a5c04233b6e18f"><code>10baf01</code></a> Fixed licenses</li>
<li><a href="https://github.com/actions/cache/commit/e39b386c9004d72a15d864ade8c0b3a702d47a37"><code>e39b386</code></a> Fix test mock return order</li>
<li><a href="https://github.com/actions/cache/commit/b6928203372a8571ff984c0c883ef3a1adfb0c06"><code>b692820</code></a> PR feedback</li>
<li><a href="https://github.com/actions/cache/commit/60749128a44d25d3c520a489e576380cf00ff3f1"><code>6074912</code></a> Rebuild dist bundles as ESM to match type:module</li>
<li><a href="https://github.com/actions/cache/commit/5a912e8b4af820fa082a0e75cfd2c782f8fbfe0e"><code>5a912e8</code></a> Fix lint and jest issues</li>
<li>Additional commits viewable in <a href="https://github.com/actions/cache/compare/caa296126883cff596d87d8935842f9db880ef25...55cc8345863c7cc4c66a329aec7e433d2d1c52a9">compare view</a></li>
</ul>
</details>
<br />
Updates `pre-commit-ci/lite-action` from 1.1.0 to 1.2.0
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/pre-commit-ci/lite-action/commit/062bca0919bc9d6e66755cc05074b70c77e111fc"><code>062bca0</code></a> v1.2.0</li>
<li><a href="https://github.com/pre-commit-ci/lite-action/commit/d20dc4e4c3aee506d74dd9b232610d4a2d4e846b"><code>d20dc4e</code></a> Merge pull request <a href="https://redirect.github.com/pre-commit-ci/lite-action/issues/28">#28</a> from pre-commit-ci/upgrade-upload-artifact-cli</li>
<li><a href="https://github.com/pre-commit-ci/lite-action/commit/9e0495689f9234cc3972814290420a6aa4891b59"><code>9e04956</code></a> upgrade upload-artifact-cli</li>
<li><a href="https://github.com/pre-commit-ci/lite-action/commit/75e6fcdeb1a837c348116fcc00e4edade1d85ab2"><code>75e6fcd</code></a> Merge pull request <a href="https://redirect.github.com/pre-commit-ci/lite-action/issues/26">#26</a> from mxr/patch-1</li>
<li><a href="https://github.com/pre-commit-ci/lite-action/commit/989699375b07ab3801c70cac41ed13916f1025c0"><code>9896993</code></a> Fix title in README</li>
<li><a href="https://github.com/pre-commit-ci/lite-action/commit/b804cf7b38c91c1a478f7191b9c0e1d08bbd4f2e"><code>b804cf7</code></a> Merge pull request <a href="https://redirect.github.com/pre-commit-ci/lite-action/issues/25">#25</a> from mxr/bump</li>
<li><a href="https://github.com/pre-commit-ci/lite-action/commit/4cf2179f914850537aecb9d44e86d8369fa6e707"><code>4cf2179</code></a> <code>pre-commit autoupdate</code></li>
<li><a href="https://github.com/pre-commit-ci/lite-action/commit/da3b32ae29c6f6b0ac82e855001ae5bb12ea7c40"><code>da3b32a</code></a> Merge pull request <a href="https://redirect.github.com/pre-commit-ci/lite-action/issues/21">#21</a> from pre-commit-ci/all-repos_autofix_all-repos-manual</li>
<li><a href="https://github.com/pre-commit-ci/lite-action/commit/f526d369b624df1cea020b8b6c58a7831d8a209b"><code>f526d36</code></a> py310+</li>
<li>See full diff in <a href="https://github.com/pre-commit-ci/lite-action/compare/5d6cc0eb514c891a40562a58a8e71576c5c7fb43...062bca0919bc9d6e66755cc05074b70c77e111fc">compare view</a></li>
</ul>
</details>
<br />
Updates `softprops/action-gh-release` from 3.0.2 to 3.0.3
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/softprops/action-gh-release/releases">softprops/action-gh-release's releases</a>.</em></p>
<blockquote>
<h2>v3.0.3</h2>
<p><code>3.0.3</code> is a maintenance release with updated dependencies. It also safely
classifies malformed GitHub API errors to avoid secondary failures (<a href="https://redirect.github.com/softprops/action-gh-release/issues/822">#822</a>).</p>
<h2>What's Changed</h2>
<h3>Bug fixes 🐛</h3>
<ul>
<li>fix: safely classify GitHub API errors by <a href="https://github.com/chenrui333"><code>@chenrui333</code></a> in <a href="https://redirect.github.com/softprops/action-gh-release/pull/822">softprops/action-gh-release#822</a></li>
</ul>
<h3>Other Changes 🔄</h3>
<ul>
<li>dependency updates</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/softprops/action-gh-release/blob/master/CHANGELOG.md">softprops/action-gh-release's changelog</a>.</em></p>
<blockquote>
<h2>3.0.3</h2>
<p><code>3.0.3</code> is a maintenance release with updated dependencies. It also safely
classifies malformed GitHub API errors to avoid secondary failures (<a href="https://redirect.github.com/softprops/action-gh-release/issues/822">#822</a>).</p>
<h2>What's Changed</h2>
<h3>Bug fixes 🐛</h3>
<ul>
<li>fix: safely classify GitHub API errors by <a href="https://github.com/chenrui333"><code>@chenrui333</code></a> in <a href="https://redirect.github.com/softprops/action-gh-release/pull/822">softprops/action-gh-release#822</a></li>
</ul>
<h3>Other Changes 🔄</h3>
<ul>
<li>dependency updates</li>
</ul>
<h2>3.0.2</h2>
<p><code>3.0.2</code> is a patch release focused on release reliability and compatibility. It
reuses existing draft releases when publishing prereleases, supports replacing
release assets on Gitea, hardens streamed asset uploads, and provides clearer
release-creation diagnostics. It also includes TypeScript, coverage, and tooling
maintenance merged since <code>3.0.1</code>.</p>
<p>This release fixes <a href="https://redirect.github.com/softprops/action-gh-release/issues/795">#795</a>, <a href="https://redirect.github.com/softprops/action-gh-release/issues/438">#438</a>, and <a href="https://redirect.github.com/softprops/action-gh-release/issues/803">#803</a>. The upload transport hardening covers the
historical failure reported in <a href="https://redirect.github.com/softprops/action-gh-release/issues/790">#790</a>, although current hosted Node 24 runners did
not reproduce it naturally. The diagnostics work is related to <a href="https://redirect.github.com/softprops/action-gh-release/issues/786">#786</a> and does not
claim a reproducible release-creation fix.</p>
<h2>What's Changed</h2>
<h3>Exciting New Features 🎉</h3>
<ul>
<li>feat: improve release error reporting and test coverage by <a href="https://github.com/chenrui333"><code>@chenrui333</code></a> in <a href="https://redirect.github.com/softprops/action-gh-release/pull/813">softprops/action-gh-release#813</a></li>
</ul>
<h3>Bug fixes 🐛</h3>
<ul>
<li>fix: publish existing draft releases as prereleases by <a href="https://github.com/godfengliang"><code>@godfengliang</code></a> in <a href="https://redirect.github.com/softprops/action-gh-release/pull/801">softprops/action-gh-release#801</a></li>
<li>fix: upload small checksum assets reliably by <a href="https://github.com/chenrui333"><code>@chenrui333</code></a> in <a href="https://redirect.github.com/softprops/action-gh-release/pull/815">softprops/action-gh-release#815</a></li>
<li>fix: replace existing release assets on Gitea by <a href="https://github.com/chenrui333"><code>@chenrui333</code></a> in <a href="https://redirect.github.com/softprops/action-gh-release/pull/816">softprops/action-gh-release#816</a></li>
<li>fix: clarify release creation 404 errors by <a href="https://github.com/chenrui333"><code>@chenrui333</code></a> in <a href="https://redirect.github.com/softprops/action-gh-release/pull/817">softprops/action-gh-release#817</a></li>
</ul>
<h3>Other Changes 🔄</h3>
<ul>
<li>chore(deps): upgrade TypeScript to 7 by <a href="https://github.com/chenrui333"><code>@chenrui333</code></a> in <a href="https://redirect.github.com/softprops/action-gh-release/pull/812">softprops/action-gh-release#812</a></li>
<li>chore(deps): remove unused TypeScript tooling by <a href="https://github.com/chenrui333"><code>@chenrui333</code></a> in <a href="https://redirect.github.com/softprops/action-gh-release/pull/814">softprops/action-gh-release#814</a></li>
<li>dependency, Node 24 pin, and CI maintenance merged since <code>3.0.1</code></li>
</ul>
<h2>3.0.1</h2>
<ul>
<li>maintenance release with updated dependencies</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/softprops/action-gh-release/commit/efb35369e0ad2afab669f228072c1b0d510eae64"><code>efb3536</code></a> release 3.0.3 (<a href="https://redirect.github.com/softprops/action-gh-release/issues/840">#840</a>)</li>
<li><a href="https://github.com/softprops/action-gh-release/commit/6441963a7597ab67f36fea0287a7ae58a9bfd8fe"><code>6441963</code></a> chore(deps): bump the npm group with 2 updates (<a href="https://redirect.github.com/softprops/action-gh-release/issues/839">#839</a>)</li>
<li><a href="https://github.com/softprops/action-gh-release/commit/e5ee6bc58a36b838b92fc1217f2e4b414b5abcc8"><code>e5ee6bc</code></a> chore(deps): bump esbuild from 0.28.1 to 0.28.2 in the npm group (<a href="https://redirect.github.com/softprops/action-gh-release/issues/837">#837</a>)</li>
<li><a href="https://github.com/softprops/action-gh-release/commit/d1e66170d32c9ec7bbcb7fae044d3d686ce304d3"><code>d1e6617</code></a> chore(deps): bump undici from 6.27.0 to 6.28.0 (<a href="https://redirect.github.com/softprops/action-gh-release/issues/831">#831</a>)</li>
<li><a href="https://github.com/softprops/action-gh-release/commit/64037519ba20f54c01bc1dc90342c929aac5a2fa"><code>6403751</code></a> chore(deps): bump the npm group with 2 updates (<a href="https://redirect.github.com/softprops/action-gh-release/issues/835">#835</a>)</li>
<li><a href="https://github.com/softprops/action-gh-release/commit/7c7184b6876126a5df15adc5b679dc450a393725"><code>7c7184b</code></a> chore(deps): bump postcss from 8.5.19 to 8.5.25 (<a href="https://redirect.github.com/softprops/action-gh-release/issues/833">#833</a>)</li>
<li><a href="https://github.com/softprops/action-gh-release/commit/0f3f0d2943676d58f9698b3ab590c2056023d77d"><code>0f3f0d2</code></a> chore(deps): bump brace-expansion from 5.0.8 to 5.0.9 (<a href="https://redirect.github.com/softprops/action-gh-release/issues/832">#832</a>)</li>
<li><a href="https://github.com/softprops/action-gh-release/commit/77fb938f2f95e717ce6705d2909af527263360a0"><code>77fb938</code></a> chore(deps): bump prettier from 3.9.5 to 3.9.6 in the npm group (<a href="https://redirect.github.com/softprops/action-gh-release/issues/830">#830</a>)</li>
<li><a href="https://github.com/softprops/action-gh-release/commit/5a6f51711ce2ba103b78f5e9550f810679f11e0e"><code>5a6f517</code></a> chore(deps): bump brace-expansion from 5.0.7 to 5.0.8 (<a href="https://redirect.github.com/softprops/action-gh-release/issues/828">#828</a>)</li>
<li><a href="https://github.com/softprops/action-gh-release/commit/a3c91c98f80000f5b06c7fc0327c54f51c6ab7d8"><code>a3c91c9</code></a> chore(deps): bump the github-actions group with 2 updates (<a href="https://redirect.github.com/softprops/action-gh-release/issues/825">#825</a>)</li>
<li>Additional commits viewable in <a href="https://github.com/softprops/action-gh-release/compare/3d0d9888cb7fd7b750713d6e236d1fcb99157228...efb35369e0ad2afab669f228072c1b0d510eae64">compare view</a></li>
</ul>
</details>
<br />
|
dependencies
github_actions
CI
|
7/7 |
.github/workflows/actionlint.yml,.github/workflows/docker_build.yml,.github/workflows/export_telemetry.yaml,.github/workflows/pre-commit.yml,.github/workflows/release.yml |
5 |
1 |
['github-actions'] |
nobody |
8-42164 8 days ago |
11-86187 11 days ago |
11-86180 11 days |
0 |
| 44425 |
JovanGerb author:JovanGerb |
chore: deprecate `FP.Float` |
This PR deprecates `FP.Float`. This definition is very poorly documented, has not been touched since the port, and says it is experimental. Nowadays, lean core has a `Float` type with the ability to prove things about it, so I think it's better to remove `FP.Float`.
This PR is motivated by a new concrete instances linter. The parameter `[C : FloatCfg]` appearing in this file causes this linter to warn.
---
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|
t-data
increases-technical-debt
maintainer-merge
|
37/31 |
Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Data/FP/Basic.lean |
2 |
3 |
['github-actions', 'grunweg'] |
nobody |
8-41502 8 days ago |
14-46341 14 days ago |
14-46334 14 days |
1 |
| 44020 |
bally65 author:bally65 |
feat(NumberTheory/Fibonacci): congruences for Fibonacci numbers modulo a prime |
For a prime p ≠ 2: F_p ≡ (5/p) (mod p), hence p ∣ F_{p-1} when (5/p) = 1 and p ∣ F_{p+1} when (5/p) = -1, plus the p % 5 forms via quadratic reciprocity. Proof in (ZMod p)[X]/(X^2 - X - 1) via Frobenius; no case split on (5/p).
AI disclosure: I used Claude and ChatGPT to discuss ideas, to adjust and optimize the approach, and to explore whether there was something worth taking on. They also proposed many of the problems, lines of thought, and decisions about direction. Almost all of the Lean code, including the changes made in response to review, was written by Claude Code.
AI 使用聲明：我使用 Claude 和 ChatGPT 討論構思、調整與優化，也討論有沒有值得挑戰的方向。它們也提出了許多題目、思路和決策方向。Lean 程式碼與依審稿意見所做的修改，幾乎全部由 Claude Code 撰寫。
Note: the English disclosure is a translation of my Chinese text, assisted by Claude. |
t-number-theory
new-contributor
LLM-generated
|
188/0 |
Mathlib.lean,Mathlib/NumberTheory/Fibonacci.lean |
2 |
11 |
['Julian-Kuelshammer', 'bally65', 'github-actions'] |
nobody |
8-40047 8 days ago |
8-43163 8 days ago |
8-45550 8 days |
0 |
| 44019 |
bally65 author:bally65 |
feat(Computability/Primrec): primality is primitive recursive |
Primrec.nat_prime : PrimrecPred Nat.Prime, via Nat.prime_def_lt' and the bounded quantifier PrimrecRel.forall_lt. Mathlib had no computability statement about Nat.Prime.
AI disclosure: I used Claude and ChatGPT to discuss ideas, to adjust and optimize the approach, and to explore whether there was something worth taking on. They also proposed many of the problems, lines of thought, and decisions about direction. Almost all of the Lean code was written by Claude Code. I applied the reviewer's suggested changes myself.
AI 使用聲明：我使用 Claude 和 ChatGPT 討論構思、調整與優化，也討論有沒有值得挑戰的方向。它們也提出了許多題目、思路和決策方向。Lean 程式碼幾乎全部由 Claude Code 撰寫。審稿人提供的修改建議由我自己套用。
Note: the English disclosure is a translation of my Chinese text, assisted by Claude. |
t-computability
new-contributor
LLM-generated
|
44/0 |
Mathlib.lean,Mathlib/Computability/Primrec/Prime.lean |
2 |
6 |
['bally65', 'github-actions', 'pepamontero'] |
nobody |
8-39813 8 days ago |
24-46564 24 days ago |
25-81210 25 days |
0 |
| 44535 |
vincentqb author:vincentqb |
feat(RingTheory/SimpleModule): semisimplicity along semilinear maps |
This PR proves that semisimplicity passes to the domain of an injective semilinear map and to the codomain of a surjective one, assuming `RingHomSurjective σ`.
The scalar-map hypothesis corrects the two `proof_wanted` statements. For example, the injective map `ℤ → ℚ` would otherwise imply that `ℤ` is semisimple as a `ℤ`-module.
---
The code, the testing, and this description were prepared with the help of an AI coding assistant.
|
LLM-generated
new-contributor
file-removed
t-ring-theory
|
31/30 |
Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/SimpleModule/Basic.lean,Wanted.lean,Wanted/RingTheory/SimpleModule/Basic.lean |
5 |
9 |
['github-actions', 'tb65536', 'vincentqb'] |
nobody |
8-21886 8 days ago |
8-24539 8 days ago |
9-46023 9 days |
0 |
| 42051 |
vihdzp author:vihdzp |
feat: lemmas relating `smallInductiveDimension` and `ZeroDimensionalSpace` |
---
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- [x] depends on: #40879
- [x] depends on: #40901
[](https://gitpod.io/from-referrer/)
|
t-topology |
15/0 |
Mathlib/Topology/InductiveDimension/Functions.lean |
1 |
3 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
8-17707 8 days ago |
8-18368 8 days ago |
8-20689 8 days |
0 |
| 44320 |
tb65536 author:tb65536 |
feat(Analysis/Normed/Unbundled/IsPowMulTrivial): triviality of power-multiplicative norms over a trivially normed field |
This is used in #42985 to generalize uniqueness of power-multiplicative norms from `NontriviallyNormedField` to `NormedField`.
---
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|
t-analysis |
62/0 |
Mathlib.lean,Mathlib/Analysis/Normed/Unbundled/IsPowMulTrivial.lean |
2 |
4 |
['eric-wieser', 'github-actions', 'tb65536', 'themathqueen'] |
nobody |
8-17582 8 days ago |
9-35860 9 days ago |
17-43909 17 days |
2 |
| 44627 |
vihdzp author:vihdzp |
chore: additivize the profinite completion |
The plan is to use this to define `ZHat` as the profinite completion of `ℤ`.
---
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- [x] depends on: #44266
|
t-algebra label:t-algebra$ |
23/13 |
Mathlib/Topology/Algebra/Category/ProfiniteGrp/Completion.lean,Mathlib/Topology/Algebra/Category/ProfiniteGrp/Limits.lean |
2 |
2 |
['github-actions', 'mathlib-dependent-issues'] |
nobody |
8-15332 8 days ago |
8-46355 8 days ago |
8-47702 8 days |
1 |
| 42365 |
hawkrobe author:hawkrobe |
feat(LinearAlgebra/TensorProduct): tensor product of graded modules is graded |
---
Split from #39849, also a first step toward the TODO in `LinearAlgebra/TensorProduct/Graded/Internal.lean` (the tensor product of graded algebras is graded.) I tried to model it after [AddMonoidAlgebra.gradeBy](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/MonoidAlgebra/Grading.html#AddMonoidAlgebra.gradeBy).
[](https://gitpod.io/from-referrer/)
|
t-algebra
new-contributor
label:t-algebra$ |
158/0 |
Mathlib/Data/DFinsupp/Defs.lean,Mathlib/LinearAlgebra/TensorProduct/Decomposition.lean,Mathlib/LinearAlgebra/TensorProduct/Map.lean |
3 |
2 |
['github-actions'] |
ocfnash assignee:ocfnash |
8-6102 8 days ago |
60-25557 60 days ago |
75-19157 75 days |
2 |
| 44462 |
wwylele author:wwylele |
feat(Geometry/Euclidean): the corner simplex |
This is working towards #44252 to connect `Simplex.volume` and `Orientation.volumeForm` for arbitrary simplex. The idea is that for the model simplex, namely `cornerSimplex` spanned by the standard Euclidean space basis, it is easy to calculate both `Simplex.volume` and `Orientation.volumeForm`. Then they can be transferred to arbitrary simplex by a affine map. This PR introduces every thing about the corner simplex before the part that touches `Affine.Simplex.volume`.
---
This is similar to the object in #40479, but I dislike the name there, and that PR has gone stale due to its deprecated dependencies. I also intentionally made this less general (instead of the corner simplex from any orthonormal basis, this one is only defined in `EuclideanSpace`). This makes the formulation of "a face of `cornerSimplex` is another `cornerSimplex`" more straightforward, as it simply corresponds to the index change in `EuclideanSpace`
That being sad, I am open to major changes such as
- If it is desired to generalize corner simplex to any orthonormal basis in any inner product space, I can certainly do that. (Alternatively, we can review #40479 and get it over the line)
- If there is a more elegant way to prove the main theorem in #44252 without corner simplex, I can also do that.
- Naming
<!-- Your PR title will become the first line of the commit message.
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- [ ] depends on: #44340
- [ ] depends on: #44463 |
t-euclidean-geometry |
139/0 |
Mathlib.lean,Mathlib/Geometry/Euclidean/CornerSimplex.lean |
2 |
7 |
['copilot-pull-request-reviewer', 'github-actions', 'mathlib-dependent-issues', 'wwylele'] |
jsm28 assignee:jsm28 |
8-6095 8 days ago |
9-5127 9 days ago |
9-8554 9 days |
1 |
| 38478 |
dagurtomas author:dagurtomas |
feat(Tactic/CategoryTheory): op attribute |
Adding `@[op]` to a lemma named `H` of shape `∀ .., f = g`, where `f` and `g` are morphisms
in some category `C`, creates a new lemma named `H_op` by applying `Quiver.Hom.op` to both sides
and then simplifying with `simp only [op_comp, op_id]`.
This PR also adds `op_of%`, and adjusts `@[map]` so that `@[op (attr := map)]` works for
equalities of morphisms in opposite categories.
---
- [x] depends on: #37183
[](https://gitpod.io/from-referrer/)
|
LLM-generated
t-category-theory
t-meta
|
333/0 |
Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Op.lean,MathlibTest/CategoryTheory/Op.lean,MathlibTest/CategoryTheory/OpNormalization.lean |
5 |
8 |
['chrisflav', 'dagurtomas', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robin-carlier'] |
nobody |
8-5195 8 days ago |
30-68138 30 days ago |
30-72728 30 days |
0 |
| 44511 |
eric-wieser author:eric-wieser |
chore: more filter generalizations in tsum/tprod lemmas |
The new statements are syntactically more general than the old ones.
---
<!-- Your PR title will become the first line of the commit message.
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|
t-topology
easy
|
30/18 |
Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Countable.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean |
4 |
1 |
['github-actions'] |
nobody |
8-3946 8 days ago |
10-70506 10 days ago |
10-77445 10 days |
0 |
| 44603 |
marcelolynch author:marcelolynch |
ci: run independent build-pipeline steps in parallel |
This PR runs independent steps of `build_template.yml` at the same time, with the Actions parallel-steps feature. The feature needs runner 2.335.0 or later. The self-hosted fleet runs 2.336.0 and 2.337.0.
- `build`: the library build runs next to the Mathlib staging. The noisy-output check runs next to the library stagings.
- `upload_cache`: the artifact download runs in the background while the cache tool builds.
- `post_steps`: the declaration dump runs in the background while the other checks run.
A/B runs on `ci-dev` branches:
| Job | Stock | This PR |
|---|---|---|
| Build tail, small change | 43 s | 22 s |
| Build tail, large change | 226 s | 169 s |
| Upload to cache | 88 / 65 / 96 s | 59 / 57 / 61 s |
| Post-Build | 375 / 342 / 351 s | 315 / 276 / 229 s |
In the Build rows, this PR ran on a 16-vCPU host and stock on a 32-vCPU host. On 262 recent PR runs, the estimated median saving is 72 s per run.
A failed step has the same effect as in the sequential template, with one difference: when the noisy-output check fails, the library stagings in its group still finish. actionlint does not know the new keys yet, so `actionlint.yml` ignores those messages until rhysd/actionlint#694 ships.
Runs (stock / this PR): [37840617714](https://github.com/leanprover-community/mathlib4/actions/runs/37840617714) / [37840622483](https://github.com/leanprover-community/mathlib4/actions/runs/37840622483), [37840939258](https://github.com/leanprover-community/mathlib4/actions/runs/37840939258) / [37840944410](https://github.com/leanprover-community/mathlib4/actions/runs/37840944410), [37632668327](https://github.com/leanprover-community/mathlib4/actions/runs/37632668327) / [37632701350](https://github.com/leanprover-community/mathlib4/actions/runs/37632701350). Failure path: [37643687235](https://github.com/leanprover-community/mathlib4/actions/runs/37643687235).
🤖
|
CI |
157/124 |
.github/workflows/actionlint.yml,.github/workflows/build_template.yml |
2 |
1 |
['github-actions'] |
nobody |
7-74304 7 days ago |
7-74304 7 days ago |
8-2008 8 days |
0 |
| 43981 |
plp127 author:plp127 |
fix: setting `pp.mdata` to true breaks `@[pp_with_univ]` |
This PR fixes an issue where turning on `pp.mdata` causes constants tagged with `@[pp_with_univ]` to print as
```
[mdata pp.universes:true]
[mdata pp.universes:true]
[mdata pp.universes:true]
[mdata pp.universes:true]
[mdata pp.universes:true]
[mdata pp.universes:true] [mdata pp.universes:true] [mdata pp.universes:true] [mdata pp.universes:true] ⋯
```
When `pp.mdata` is set to true, expressions with mdata are printed by first printing the mdata and the printing the bare expression underneath. This breaks `@[pp_with_univ]` which works by applying mdata setting `pp.universes` to true onto the constant name, and then redelaborating the new expression containing mdata. This causes an infinite loop the the delaborator since `@[pp_with_univ]` applies the mdata, and then since `pp.mdata` is true the mdata is removed before delaborating the constant, which then has mdata applied again, and so on. We fix the issue by instead having the implementation of `@[pp_with_univ]` directly set the `pp.universes` option, instead of delegating it to `delabMData` with a metadata.
---
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|
t-meta
maintainer-merge
|
63/6 |
Mathlib/Tactic/PPWithUniv.lean,MathlibTest/Delab/PPWithUniv.lean |
2 |
10 |
['JovanGerb', 'github-actions', 'joneugster', 'plp127'] |
joneugster assignee:joneugster |
7-55231 7 days ago |
7-59131 7 days ago |
22-17670 22 days |
0 |
| 43183 |
BorisTheBrave author:BorisTheBrave |
fix(Tactic/Linarith): carry `!` and the configuration into `linarith?… |
`linarith?` uses the same configuration as `linarith`,
but previously printed a bare `linarith only [...]` suggestion regardless
of the configuration.
Now all config options except `minimize` are carried into the suggestion.
---
Note: #42588 has a [test](https://github.com/leanprover-community/mathlib4/pull/42588/files#diff-3657543f804f0a57e384f6a9338cc53803a50bebdfb16c1ecd0b514f3fda332fR863) that
unintentionally highlights the problem:
```lean
/--
info: Try this:
[apply] linarith only [hne, hle]
-/
#guard_msgs in
example (a b : ℚ) (hne : a ≠ b) (hle : a ≥ b) (junk : (0:ℚ) < 1) : b < a := by
linarith? +splitNe
```
This suggestion doesn't actually close the proof.
It should suggest `linarith +splitNE only [hne, hle]`.
Should we be using `says` syntax for these tests? I'm unclear on the rule here.
Note: `simp?` has very similar code, `filterSuggestionsAndLocalsFromSimpConfig`, that this PR was modelled after.
AI disclosure:
Claude Code (Fable) first flagged this problem to me, and wrote the first draft. I
made some tweaks to better fit mathlib's style, and wrote all the prose.
[](https://gitpod.io/from-referrer/) |
t-meta
new-contributor
maintainer-merge
|
68/6 |
Mathlib/Tactic/Linarith/Frontend.lean,MathlibTest/Tactic/Linarith/Basic.lean |
2 |
18 |
['BorisTheBrave', 'JovanGerb', 'github-actions', 'joneugster', 'sharky564'] |
joneugster assignee:joneugster |
7-52301 7 days ago |
42-59668 42 days ago |
49-57881 49 days |
0 |
| 44532 |
SnirBroshi author:SnirBroshi |
doc(1000-yaml): clarify ambiguous titles, add new items, fix formatting |
- Added "(subject)" to titles which appear multiple times
(e.g. "Euler's theorem" → "Euler's theorem (number theory)" and "Euler's theorem (differential geometry)")
- "Gentzen's consistency proof" was added in https://github.com/1000-plus/1000-plus.github.io/pull/36
- "Determination of the fifth Busy Beaver value" was added in https://github.com/1000-plus/1000-plus.github.io/pull/46
- The ID of "Lamé’s theorem" was changed in https://github.com/1000-plus/1000-plus.github.io/pull/39
- Moved "Bézout's identity" to keep the list sorted by the ID
- Fix formatting
---
In case you're wondering about `comment`s not being quoted (like `title`s), I've checked with the same way these are parsed by CI (PyYAML's `yaml.safe_load()`) that they're parsed the same way with and without quotes. A couple of `comment`s still have quotes because they need them.
btw "Bézout's identity" isn't in the [website](https://1000-plus.github.io/all) (only "Bézout's theorem", which is a different item) but it is in the yaml, and AFAICT the intention was to PR it to the list since it's in [Wikipedia's list](https://en.wikipedia.org/wiki/List_of_theorems), so I didn't delete it. See the PR description of #21926.
(if we do PR it, I think [this](https://github.com/1000-plus/1000-plus.github.io/blob/8e04b97dd24adc6e931be78a884da7e935bc8780/sync_mathlib_data.py#L374-L377) can be deleted)
<!-- Your PR title will become the first line of the commit message.
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git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
Second, co-authors can also be listed in lines at the very bottom of
the commit message (that is, directly before the `---`) using the following format:
Co-authored-by: Author Name <author@email.com>
If you are moving or deleting declarations, please include these lines
at the bottom of the commit message (before the `---`, and also before
any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
- ...
Any other comments you want to keep out of the PR commit should go
below the `---`, and placed outside this HTML comment, or else they
will be invisible to reviewers.
If this PR depends on other PRs, please list them below this comment,
using the following format:
- [ ] depends on: #abc [optional extra text]
- [ ] depends on: #xyz [optional extra text]
-->
|
documentation
maintainer-merge
|
81/79 |
docs/100.yaml,docs/1000.yaml |
2 |
6 |
['SnirBroshi', 'github-actions', 'grunweg', 'joneugster'] |
nobody |
7-49646 7 days ago |
11-2150 11 days ago |
11-2143 11 days |
0 |
| 44361 |
JovanGerb author:JovanGerb |
chore(Algebra/Homology/ShortComplex): remove many backward options |
This PR removes almost all uses of `backward.isDefEq.respectTransparency` from `Algebra/Homology/ShortComplex` by marking definitions `@[implicit_reducible]` appropriately.
---
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the commit message (that is, directly before the `---`) using the following format:
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any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
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below the `---`, and placed outside this HTML comment, or else they
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|
tech debt |
115/309 |
Mathlib/Algebra/Homology/ShortComplex/Ab.lean,Mathlib/Algebra/Homology/ShortComplex/Basic.lean,Mathlib/Algebra/Homology/ShortComplex/Exact.lean,Mathlib/Algebra/Homology/ShortComplex/HomologicalComplex.lean,Mathlib/Algebra/Homology/ShortComplex/Homology.lean,Mathlib/Algebra/Homology/ShortComplex/LeftHomology.lean,Mathlib/Algebra/Homology/ShortComplex/Limits.lean,Mathlib/Algebra/Homology/ShortComplex/Preadditive.lean,Mathlib/Algebra/Homology/ShortComplex/PreservesHomology.lean,Mathlib/Algebra/Homology/ShortComplex/RightHomology.lean,Mathlib/Algebra/Homology/ShortComplex/SnakeLemma.lean,Mathlib/CategoryTheory/Abelian/Refinements.lean,Mathlib/CategoryTheory/Limits/Cones.lean,Mathlib/CategoryTheory/Limits/IsLimit.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean |
15 |
7 |
['JovanGerb', 'github-actions', 'joelriou', 'leanprover-radar', 'robin-carlier'] |
nobody |
7-49147 7 days ago |
16-45138 16 days ago |
16-45131 16 days |
0 |
| 39875 |
mkaratarakis author:mkaratarakis |
refactor(NumberField/House): expose Siegel lemma infrastructure |
Add new theorems for house of algebraic integer, expose Siegel's lemma infrastructure and rename the private basis-matrix bound to `basisMatrixInvSupNorm`, make `house` reducible, and adjust `exists_ne_zero_int_vec_house_le`. This changes are required for #39874.
---
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git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
Second, co-authors can also be listed in lines at the very bottom of
the commit message (that is, directly before the `---`) using the following format:
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at the bottom of the commit message (before the `---`, and also before
any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
- ...
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below the `---`, and placed outside this HTML comment, or else they
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[](https://gitpod.io/from-referrer/) |
|
62/32 |
Mathlib/NumberTheory/NumberField/House.lean |
1 |
7 |
['github-actions', 'mathlib-merge-conflicts', 'mkaratarakis', 'tb65536'] |
nobody |
7-48866 7 days ago |
37-9574 37 days ago |
100-61344 100 days |
5 |
| 43079 |
Parcly-Taxel author:Parcly-Taxel |
chore: rename underscore defs in `JacobiTheta.Bounds` |
In the `HurwitzKernelBounds` namespace:
* `f_nat, g_nat, F_nat -> f, g, F`
* `f_int, F_int -> fZ, FZ` |
t-number-theory
tech debt
|
111/93 |
Mathlib/NumberTheory/LSeries/HurwitzZetaEven.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaOdd.lean,Mathlib/NumberTheory/ModularForms/JacobiTheta/Bounds.lean |
3 |
4 |
['Parcly-Taxel', 'github-actions', 'jcommelin', 'mathlib-merge-conflicts'] |
nobody |
7-47277 7 days ago |
7-48308 7 days ago |
53-75543 53 days |
0 |
| 43220 |
wwylele author:wwylele |
refactor(Combinatorics/Partition): eliminate T2Space requirement from generating function |
Previously, the key lemma in this file had the shape `HasProd (fun i ↦ 1 + ∑' j, f (i + 1) (j + 1) • X ^ ((i + 1) * (j + 1))) (genFun f)`, which has a nested infinite sum inside the infinite prod. As a result, all related lemma needed T2Space when it doesn't have to. The new formulation extract the inner sum into a power series definition `genFunFactor` that works in general topological space, eliminating `T2Space` for the `HasProd`/`HasSum` lemma.
The old formula is kept under the name `hasProd_genFun'`. This is still used in the downstream file `Glaisher.lean`. To reduce the code change size, the refactor in `Glaisher.lean` is deferred to a future PR
---
<!-- Your PR title will become the first line of the commit message.
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Co-authors in the squash commit are gathered from two sources:
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git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
Second, co-authors can also be listed in lines at the very bottom of
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at the bottom of the commit message (before the `---`, and also before
any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
- ...
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below the `---`, and placed outside this HTML comment, or else they
will be invisible to reviewers.
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics |
96/79 |
Mathlib/Combinatorics/Enumerative/Partition/Basic.lean,Mathlib/Combinatorics/Enumerative/Partition/GenFun.lean,Mathlib/Combinatorics/Enumerative/Partition/Glaisher.lean |
3 |
3 |
['copilot-pull-request-reviewer', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
7-46526 7 days ago |
7-48459 7 days ago |
48-2240 48 days |
1 |
| 44275 |
seewoo5 author:seewoo5 |
feat(FourierTransform): linear equivariance |
---
<!-- Your PR title will become the first line of the commit message.
In this box, the text above the `---` (if not empty) will be appended
to the commit message, and can be used to give additional context or
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- Nat.bit1_add_bit1
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-->
Linear equivariance of Fourier transform: `𝓕 (f ∘ A) w = |A.toLinearMap.det|⁻¹ • 𝓕 f (A.symm.adjoint w)`. Proof is essentially by change of variable. Originally written by Opus 5, with additional golfs by myself.
This was formalized while I was refactoring OpenAI's formalization on Cohn-Elkies bound and its optimal exponent. Note that one can generalize further (actually without much effort) to the case where the domain and codomain of `A` are different, by replacing determinant with [`LinearMap.normDet`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/InnerProductSpace/NormDet.html#LinearMap.normDet). But it seems that this would add a lot imports, and I may had to make a separate file (something like `Fourier/Linear.lean`?), but I'm not sure if this is a good idea. The general version can be found [here](https://github.com/seewoo5/cohn-elkies-refactor/blob/b5165ff7049114ce2c551f15b8c75d4aca5ab850/CohnElkiesForMathlib/Analysis/Fourier/FourierTransform.lean#L30). |
t-analysis
LLM-generated
|
20/3 |
Mathlib/Analysis/Fourier/FourierTransform.lean |
1 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
7-45428 7 days ago |
7-46148 7 days ago |
18-63083 18 days |
0 |
| 44323 |
marcelolynch author:marcelolynch |
chore(Init): stop setting a default library suggestions engine |
This PR removes `public import Lean.LibrarySuggestions.Default` from `Mathlib.Init`. Thus Mathlib no longer sets a default library suggestions engine. Since leanprover/lean4#15159, the default engine builds its index on the first query in each process, and with `import Mathlib` this takes minutes. The Lean maintainers consider the feature unused.
Without an engine, the `+suggestions` modes of `grind`, `simp?`, `simp_all?` and `solve_by_elim` fail until the file adds `import Lean.LibrarySuggestions.Default` or `set_library_suggestions`. `try?` continues to work.
The PR also removes the outdated `set_library_suggestions` override from `MathlibTest/RegisterTryTactic.lean`, and replaces the `grind +suggestions` docstring examples with `grind`. `Mathlib.Tactic.DuplicateDecls` now imports `Lean.Meta.CompletionName` directly.
Discussion: [#lean4 > lean4#15159 causes significant regression in MathlibTests](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/lean4.2315159.20causes.20significant.20regression.20in.20MathlibTests)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
t-meta
LLM-generated
maintainer-merge
|
4/10 |
Mathlib/Init.lean,Mathlib/Tactic/DuplicateDecls.lean,Mathlib/Tactic/TacticAnalysis/Declarations.lean,MathlibTest/RegisterTryTactic.lean |
4 |
5 |
['JovanGerb', 'github-actions', 'joneugster', 'leanprover-radar'] |
nobody |
7-45077 7 days ago |
17-37087 17 days ago |
17-37080 17 days |
0 |
| 44306 |
grunweg author:grunweg |
chore: rename check_title_labels in kebap-case |
This matches general conventions for such tools, as discussed on Zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Naming.20convention/near/451072858
---
<!-- Your PR title will become the first line of the commit message.
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|
CI
maintainer-merge
|
71/4 |
.github/workflows/build_template.yml,.github/workflows/check_pr_titles.yaml,lakefile.lean,scripts/README.md,scripts/check-title-labels.lean,scripts/check_title_labels.lean |
6 |
23 |
['Vierkantor', 'github-actions', 'grunweg', 'joneugster', 'marcelolynch', 'mathlib-bors'] |
nobody |
7-42230 7 days ago |
17-14637 17 days ago |
17-16798 17 days |
0 |
| 44496 |
JovanGerb author:JovanGerb |
perf(Linter): combine multiple syntax-based linters |
This PR combines various syntax based linters into a single linter, so that they only need to do one loop through the syntax. This loop though the syntax is designed to be efficient for nodes on which none of the linters are applicable. This is done by using a single `match` on the syntax node kind.
- The loop itself is done in the `CommandElabM` monad, so that messages can be logged directly. It would be marginally faster to do the loop in `StateRefT _ BaseIO`, keeping track of all warnings in some state, and then logging them afterwards. But that is significantly more inconvenient to write.
- There are some more syntax based linters in `Mathlib.Tactic.Linter.DeprecatedSyntax` and `Mathlib.Tactic.Linter.DocString`, but those are left out of this PR for convenience.
---
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|
t-linter
large-import
|
222/254 |
Mathlib.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/Linter/AuxLemma.lean,Mathlib/Tactic/Linter/OldObtain.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/Linter/SyntaxBased.lean,MathlibTest/Linter/AuxLemma.lean,MathlibTest/Linter/OldObtain.lean,MathlibTest/Linter/TextBased.lean |
11 |
6 |
['JovanGerb', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts'] |
nobody |
7-38497 7 days ago |
7-43388 7 days ago |
12-300 12 days |
0 |
| 42888 |
forxhunter author:forxhunter |
feat(Combinatorics/SimpleGraph): abstract polymer model and the Kotecký–Preiss criterion |
This PR introduces the abstract polymer model of statistical mechanics and the classical
convergence criteria for its cluster expansion, in
`Mathlib/Combinatorics/SimpleGraph/ClusterExpansion.lean`.
The central object is the partition function over independent subsets of a finite family
`Λ` in a graph `G` of incompatibilities, with activities (weights) `w`:
`G.indepPartitionFunction w Λ = ∑ S ⊆ Λ independent in G, ∏ v ∈ S, w v`
As a graph invariant this is the **multivariate independence polynomial** (the
independent-set polynomial of Scott–Sokal) of the subgraph induced on `Λ`, evaluated at `w`;
in statistical mechanics it is the partition function of the abstract polymer model /
hard-core lattice gas. Mathlib has `SimpleGraph.IsIndepSet` (and `IsNIndepSet`, `indepNum`,
…) but — as far as I can find — no independence polynomial in any form; the definition here
is built directly on `IsIndepSet` and is stated for weights in an arbitrary `CommSemiring`.
Main results:
* `SimpleGraph.indepPartitionFunction_deletion`: the deletion identity
`Z Λ = Z (Λ.erase v) + w v * Z (Λ \ N[v])` (over any `CommSemiring`), the induction
backbone of the whole theory.
* `SimpleGraph.DobrushinCriterion` / `SimpleGraph.KoteckyPreissCriterion`: the two classical
sufficient convergence conditions as `Prop`-valued structures, and
`KoteckyPreissCriterion.toDobrushinCriterion`: KP implies Dobrushin via the explicit
damping ansatz `x v = 1 - exp (-(|w v| * exp (a v)))`.
* `SimpleGraph.DobrushinCriterion.indepPartitionFunction_pos`: **nonvanishing** — for signed
real activities satisfying Dobrushin's condition, `0 < Z Λ` for every finite `Λ`, proved
by a strong induction through the deletion identity (the inductive route of
Bissacot–Fernández–Procacci, J. Stat. Phys. 139 (2010); no analyticity, no cluster
combinatorics), together with one-step and telescoped ratio bounds and the two-sided
log-ratio bound `|log (Z Λ) - log (Z Λ')| ≤ ∑ v ∈ Λ \ Λ', -log (1 - x v)`.
* The finite **Kotecký–Preiss theorem** (Comm. Math. Phys. 103 (1986)) with the classical
constants: `KoteckyPreissCriterion.indepPartitionFunction_pos`,
`exp (-∑ a)`- and `exp (∑ a)`-ratio bounds, and
`|log (Z Λ) - log (Z Λ')| ≤ ∑ v ∈ Λ \ Λ', |w v| * exp (a v) ≤ ∑ v ∈ Λ \ Λ', a v`.
* Also new small API: `SimpleGraph.closedNeighborFinset` (`N[v]` as a `Finset`, which
Mathlib currently lacks), `IsIndepSet.not_adj`, `isIndepSet_coe_iff`, and the
unconditional nonnegative-activity estimates (`one_le_indepPartitionFunction`,
`indepPartitionFunction_le_prod`, monotonicity, domination by absolute activities).
Everything is stated for a locally finite incompatibility graph (`[G.LocallyFinite]`) with
finite volumes `Λ : Finset α`; the infinite-volume statements are exactly the monotone
limits of these and are left for a later PR.
**Motivation.** Cluster/polymer expansions are the workhorse of rigorous statistical
mechanics and constructive quantum field theory — they are the standard tool behind
exponential decay of correlations, uniqueness of Gibbs states, and strong-coupling
expansions in lattice gauge theory. To my knowledge no proof assistant has any of this
material (checked against Lean/Mathlib, Coq, and Isabelle AFP, 2026-08-17). This PR is the
self-contained combinatorial/analytic core, extracted from an ongoing Lean formalization
program in mathematical physics (lattice gauge theory, Osterwalder–Seiler strong-coupling
regime), where these bounds are the engine for decay-of-correlations results. Via
Scott–Sokal (J. Stat. Phys. 118 (2005)), the nonvanishing region of this same polynomial is
also the natural home of the Lovász local lemma / Shearer bound, so the object should be
useful to combinatorics independently of the physics.
References: Kotecký–Preiss 1986; Dobrushin 1996; Fernández–Procacci 2007;
Bissacot–Fernández–Procacci 2010; Scott–Sokal 2005 (LLL connection); Fialho
arXiv:2001.00652 (proof source for the follow-up FP engine).
**Planned follow-up PRs** (material exists and is proved; kept out to keep this PR
reviewable):
1. The Fernández–Procacci criterion (replace `exp` in KP by the local partition function on
`N[v]`) and its convergence engine, via Fialho's minorant-invariant induction
(arXiv:2001.00652) — weaker hypothesis, sharper `(1 + μ)` one-step bound.
2. Certified separations of the criterion hierarchy: Dobrushin strictly weaker than KP, FP
strictly weaker than Dobrushin (quantified over *all* ansatzes), and non-necessity of all
three.
3. Exponential decay of truncated correlations in the walk-distance of the incompatibility
graph, with explicit constants.
4. One-point occupancy (density) bounds under KP.
5. Possibly: the uniform-activity specialization as a univariate `Polynomial`, connecting
to the classical independence polynomial `I(G, x)`.
Naming is up for discussion: `indepPartitionFunction` was chosen to serve both the graph
theory and the statistical mechanics readings; I am happy to rename (e.g. to something
closer to "independence polynomial") or to split the `CommSemiring` definition from the
real-activity engine if reviewers prefer.
**AI disclosure**: this PR was substantially generated with Claude Code (Anthropic) — the
proof scripts, the port to current master, and the deduplication against existing Mathlib
material. It is opened as a **draft** while the human author reviews the content; it will be
marked ready only after that review, per the policy that contributors must understand and be
able to defend AI-assisted contributions. The `LLM-generated` label applies and should be
added by a maintainer.
awaiting-author items (will be resolved before marking ready):
- [x] Author review of the full file per the AI-contribution policy.
- [x] The `Authors:` line is finalized as `Tianyu (forxhunter)`.
- [x] Decide on the final name for `indepPartitionFunction` with reviewers.
|
t-combinatorics
new-contributor
LLM-generated
|
723/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/ClusterExpansion.lean |
2 |
3 |
['forxhunter', 'github-actions'] |
nobody |
7-35871 7 days ago |
7-36598 7 days ago |
7-36686 7 days |
0 |
| 44360 |
justus-springer author:justus-springer |
feat(LinearAlgebra/Dimension/DivisionRing): add `finrank_span_eq_finrank_iff` |
This is a criterion for the reverse inequality of `finrank_span_le_finrank` in terms of linearly independent subsets. This criterion will be used in the upcoming lattice refactor, see the [zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Definitions.20of.20lattices/with/620086310).
As was already noted in the docstring, we also have `Submodule.finrank_span_eq_finrank` which works in a different setting and I don't think one can be deduced from the other. I've moved the docstring note to the new equality lemma.
Co-authored-by: Anouk Brose <aebrose@ucdavis.edu>
- [x] depends on: #44359
---
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|
t-algebra label:t-algebra$ |
60/8 |
Mathlib/LinearAlgebra/Dimension/DivisionRing.lean |
1 |
2 |
['github-actions', 'mathlib-dependent-issues'] |
nobody |
7-34938 7 days ago |
16-23803 16 days ago |
16-24670 16 days |
1 |
| 44261 |
javgomzar author:javgomzar |
feat(Algebra/Category/Grp): free functor preserves monomorphisms |
Refactored the proof for AddCommGrpCat, so that it also works in GrpCat.
---
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|
t-algebra
new-contributor
label:t-algebra$ |
18/5 |
Mathlib/Algebra/Category/Grp/Adjunctions.lean |
1 |
15 |
['JX-Mo', 'github-actions', 'javgomzar', 'mathlib-merge-conflicts'] |
nobody |
7-34689 7 days ago |
7-35384 7 days ago |
19-7964 19 days |
0 |
| 42186 |
marcelolynch author:marcelolynch |
refactor(Tactic/Linter/MinImports): make the minImports linter stateful |
This PR rewrites the `minImports` linter as a stateful linter (leanprover/lean4#14357). The linter behavior does not change. The existing tests in `MathlibTest/MinImports.lean` pass without changes. The PR adds one test section that sets `Elab.async true` explicitly: it checks that the linter accumulates imports correctly under parallel elaboration, and that `#import_bumps` keeps parallel elaboration on.
The old implementation kept the cumulative imports in a global `IO.Ref`. The ref is not safe under parallel elaboration. For this reason, `#import_bumps` set `Elab.async false` for the rest of the file. The new implementation keeps the same data in the linter state. The elaborator threads the state through the commands of the file, and the data stays correct under parallel elaboration. `#import_bumps` does not disable `Elab.async` anymore.
Implementation notes:
- The `#reset_min_imports` elaborator does nothing. The linter detects the command syntax and clears its own state. The reset works also when the linter option is off, as before.
- The post phase removes `set_option ... in` prefixes with `withSetOptionIn` from core. leanprover/lean4#14581 generalizes the result type of that function, so it accepts the phase of a stateful linter and not only a `CommandElab`. The generalization ships in v4.34.0-rc1.
- The state type `ImportState` and the linter handle are public. A follow-up can pass the computed import set to the `upstreamableDecl` linter, which computes the same data a second time today.
Measurements on synthetic files (Apple Silicon, 18 cores, medians of 3 runs):
- Proof-heavy file (150 commands, about 120 ms each), linter on: 20.0 s before, 8.8 s after. The old version serialized elaboration of the whole file. The new version keeps elaboration parallel and runs the lint chain next to it.
- The old version with `Elab.async true` emits 123 warning lines instead of the correct 11, because parallel lint tasks race on the ref. The new version emits the correct 11 lines.
- Linter off (2000 trivial commands): the added cost is about 45 microseconds per command.
`registerStatefulLinter` shipped in v4.34.0-rc1
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
t-linter
LLM-generated
|
149/78 |
Mathlib/Tactic/Linter/MinImports.lean,MathlibTest/MinImports.lean |
2 |
3 |
['JovanGerb', 'github-actions', 'thorimur'] |
thorimur assignee:thorimur |
7-32597 7 days ago |
66-17131 66 days ago |
66-17124 66 days |
1 |
| 43037 |
kim-em author:kim-em |
feat(Tactic/NormNum): add `norm_num_simproc` and use it for `Nat.fib` |
Adds `norm_num_simproc` to share a numerical evaluator between `norm_num` and simproc sets, and uses it to make `Nat.fib` evaluation available to `simp` and `grind`.
```lean
norm_num_simproc [simp, seval] evalNatFib (Nat.fib _) where
eval {_ _} e := ...
```
This declares the simproc `evalNatFib` and the extension `evalNatFib.normNumExt`. The set list defaults to `[simp]`; an explicit list replaces it, with `[]` disabling automatic simproc registration. Both registrations support `local` and `scoped`.
The extension retains recursive operand normalization for direct consumers such as `ring` and `positivity`. `Nat.fib` is a first example: around 30 existing extensions are candidates for conversion, including `Nat.factorial`, `Nat.Prime`, and the Jacobi and Legendre symbols. Each will need its own registration and performance assessment.
:robot: prepared with Codex+Claude
|
t-meta
LLM-generated
|
316/9 |
Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/NormNum/NatFib.lean,MathlibTest/Tactic/NormNum/NatFib.lean,MathlibTest/Tactic/NormNum/SimprocMacro.lean |
4 |
16 |
['JovanGerb', 'github-actions', 'kim-em', 'thorimur'] |
thorimur assignee:thorimur |
7-32505 7 days ago |
23-67925 23 days ago |
55-80091 55 days |
0 |
| 43224 |
joelriou author:joelriou |
feat(Category/Abelian/Injective): interaction between `InjectiveResolution.extMk` and the connecting morphism |
Given a short exact sequence `0 → X₁ → X₂ → X₃ → 0` and an injective resolution `R` of an object `Y`, we give a concrete computation of the connecting homomorphism $$Ext^n(X_1, Y) \to Ext^{n + 1}(X_3, Y)$$.
---
- [x] depends on: #43492
- [x] depends on: #43086
- [x] depends on: #43089
- [x] depends on: #43103
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[](https://gitpod.io/from-referrer/)
|
tech debt
t-category-theory
|
199/30 |
Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/SingleTriangle.lean,Mathlib/Algebra/Homology/DerivedCategory/SmallShiftedHom.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexShift.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexSingle.lean,Mathlib/Algebra/Homology/HomotopyCategory/Pretriangulated.lean,Mathlib/Algebra/Homology/ShortComplex/Basic.lean,Mathlib/CategoryTheory/Abelian/Injective/Ext.lean,Mathlib/CategoryTheory/Shift/Basic.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean |
11 |
11 |
['Multramate', 'github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robin-carlier'] |
nobody |
7-30815 7 days ago |
7-31734 7 days ago |
39-9441 39 days |
2 |
| 42138 |
mitchell-horner author:mitchell-horner |
feat(Combinatorics/SimpleGraph): copies into `⊤` and containment in the complete graph |
Add copy constructors mirroring the existing `Copy.bot` API.
---
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- [x] depends on: #43201
[](https://gitpod.io/from-referrer/)
|
t-combinatorics
tech debt
|
116/31 |
Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Maps.lean |
3 |
29 |
['Ruben-VandeVelde', 'SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mitchell-horner', 'vlad902'] |
SnirBroshi assignee:SnirBroshi |
7-27612 7 days ago |
20-81693 20 days ago |
62-44241 62 days |
0 |
| 44681 |
Altabeh author:Altabeh |
feat(Analysis/ODE/Linearization): the derivative of a flow at a fixed… |
Add a new file `Mathlib/Analysis/ODE/Linearization.lean`. Let `ϕ : Flow ℝ E` on a real Banach space
be generated by a vector field `f`, meaning `∀ x t, HasDerivAt (fun s ↦ ϕ s x) (f (ϕ t x)) t`. If
`e` is a fixed point of `ϕ` and `f` has derivative `A` at `e`, then every time-`t` map has derivative
`exp (t • A)` at `e`:
* `Flow.hasFDerivAt_of_isFixedPt`: `HasFDerivAt (ϕ t) (exp (t • A)) e` for every `t : ℝ`.
* `Flow.fderiv_eq_exp_of_isFixedPt`: the `fderiv` form.
* `Flow.eventually_norm_sub_exp_le`: a uniform estimate on compact time intervals. For `0 ≤ T` and
`0 < ε`, eventually for `x` near `e`, `‖ϕ t x - e - exp (t • A) (x - e)‖ ≤ ε * ‖x - e‖` for all
`t ∈ [0, T]`.
Only differentiability of `f` at `e` is needed; nothing is assumed about `f` elsewhere. The estimate
comes from comparing `ϕ t x - e` with `exp (t • A) (x - e)` using Grönwall's inequality. Negative
times are handled by applying the result to `ϕ.reverse`.
---
This PR is independent of the `LipschitzWith.flow` PR. It applies to any `Flow ℝ E` with a
generating vector field, which includes those flows.
**Proof of `eventually_norm_sub_exp_le` is done by a combination of `Claude Opus 5.5` and `GPT-5.6 Sol`. Linting and comments were done by AI.*** |
new-contributor
t-analysis
LLM-generated
|
166/0 |
Mathlib.lean,Mathlib/Analysis/ODE/Linearization.lean |
2 |
3 |
['github-actions', 'grunweg'] |
nobody |
7-21591 7 days ago |
7-22194 7 days ago |
7-24810 7 days |
0 |
| 44680 |
Altabeh author:Altabeh |
feat(Analysis/ODE/LipschitzFlow): the flow of a globally Lipschitz ve… |
Add a new file `Mathlib/Analysis/ODE/LipschitzFlow.lean`. A globally Lipschitz vector field
`v : E → E` on a real Banach space has a unique solution of `γ' = v ∘ γ` through every point, defined
for all time, and these solutions form a continuous flow:
* `LipschitzWith.exists_forall_hasDerivAt`: global existence of solutions.
* `LipschitzWith.dist_le_of_forall_hasDerivAt`: two solutions satisfy
`dist (γ t) (δ t) ≤ dist (γ 0) (δ 0) * exp (K * |t|)`.
* `LipschitzWith.flow : Flow ℝ E`: the flow of `v`.
* `LipschitzWith.hasDerivAt_flow`: the orbits of the flow solve `γ' = v ∘ γ`.
* `LipschitzWith.flow_eq_of_hasDerivAt`: every global solution is an orbit of the flow.
* `LipschitzWith.dist_flow_le`: `dist (flow t x) (flow t y) ≤ dist x y * exp (K * |t|)`.
The field does not need to be bounded. For a bounded field, Picard–Lindelöf (`IsPicardLindelof`)
gives solutions on each interval `(-(n + 1), n + 1)`, and uniqueness glues them into a global
solution. A general field is reduced to this case by multiplying `v` by a Lipschitz cutoff that is
`1` on `closedBall 0 R`. Grönwall's inequality, using `‖v y‖ ≤ ‖v 0‖ + K * ‖y‖`, shows that for
large `R` the solution stays in that ball on the time interval, so the cutoff does not change it.
---
Continuity of the flow jointly in `(t, x)` comes from
`continuousOn_prod_of_continuousOn_lipschitzOnWith'`, using the exponential separation bound on
bounded time intervals.
**The proofs of`exists_forall_hasDerivAt_of_forall_Ioo`, `lipschitzWith_cutoff_smul`, `norm_le_gronwallBound` and part of `dist_le_of_forall_hasDerivAt` used a combo of `GPT-5.6 Sol` and `Claude Opus 5.5`. Linting and comments were done by AI as well.** |
t-analysis
new-contributor
LLM-generated
|
276/0 |
Mathlib.lean,Mathlib/Analysis/ODE/LipschitzFlow.lean |
2 |
3 |
['github-actions', 'grunweg'] |
nobody |
7-21470 7 days ago |
7-22099 7 days ago |
7-24963 7 days |
0 |
| 40964 |
grunweg author:grunweg |
chore: explicitly specify free universes in `TopCat` and friends |
Avoid free universe variables, as discussed on Zulip: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2338223.20The.20Category.20of.20C.5En.20Manifolds/near/587824522
Perhaps, we should have a linter for this, such as by
- extending the `pp_universes` attribute (TODO fix name) to take a list of universes, and only pretty-print those
- the linter checks for any universes which are annotated with this attribute: if a declaration has a universe metavariable corresponding to such a universe, we warn
---
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[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
117/114 |
Mathlib/Algebra/Category/ModuleCat/Topology/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Homology.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/AlgebraicGeometry/Spec.lean,Mathlib/RepresentationTheory/Continuous/TopRep.lean,Mathlib/Topology/Specialization.lean,MathlibTest/CategoryTheory/ConcreteCategory/TopModuleCat.lean |
7 |
11 |
['felixpernegger', 'github-actions', 'grunweg', 'leanprover-radar', 'mathlib-merge-conflicts'] |
nobody |
7-18322 7 days ago |
7-19261 7 days ago |
25-13923 25 days |
0 |
| 43205 |
wwylele author:wwylele |
feat(FieldTheory): extension is separable if its degree is less than the positive char |
This is a series of lemma analog to the existing CharZero lemma
- `Polynomial.mem_support_derivative` -> `Polynomial.mem_support_derivative_of_isSMulRegular` (I used SMulRegular as this seems to be the right spelling for Semiring)
- `Polynomial.degree_derivative` -> `Polynomial.degree_derivative_of_isSMulRegular`
- `Polynomial.natDegree_derivative` -> `Polynomial.natDegree_derivative_of_isSMulRegular`
- `Irreducible.separable` -> `Irreducible.separable_of_natCast_natDegree_ne_zero`
- `IsSeparable.of_integral` -> `IsSeparable.of_integral_of_natCast_natDegree_ne_zero`
- `Algebra.IsSeparable.of_integral` -> `Algebra.IsSeparable.of_integral_of_finrank_lt` & `Algebra.IsSeparable.of_integral_of_rank_lt`
---
From https://github.com/wwylele/Compass
<!-- Your PR title will become the first line of the commit message.
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-->
[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
70/15 |
Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/FieldTheory/Separable.lean |
2 |
3 |
['copilot-pull-request-reviewer', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
7-10612 7 days ago |
7-11840 7 days ago |
48-8277 48 days |
0 |
| 43556 |
teorth author:teorth |
feat(Analysis/SpecialFunctions/Gamma/Digamma): the real digamma function, its asymptotics, and Gauss' series |
This extends the digamma file with the real digamma function, its logarithmic
asymptotics, and Gauss' series for `ψ`.
---
Main additions:
`Mathlib/Analysis/SpecialFunctions/Gamma/Digamma.lean`
* `Real.digamma`, the real digamma function `logDeriv Real.Gamma`, and its
real functional equations (`Real.digamma_apply_add_one`, `..._add_nat`,
`..._nat_add_one`, `..._one_sub`, `..._two_mul`), obtained from the complex
versions via the bridge below.
* `Complex.digamma_ofReal : Complex.digamma x = Real.digamma x` (a `simp`
lemma, unconditional thanks to matching junk values at the non-positive
integers), and `Complex.digamma_eq_re`.
* Real asymptotics: `Real.monotoneOn_digamma` (monotone on `Ioi 0`, via
log-convexity of `Γ`), `Real.digamma_le_log_le` (`ψ x ≤ log x ≤ ψ (x + 1)`),
and `Real.abs_digamma_sub_log_le` (`|ψ x - log x| ≤ 1 / x`).
* `Complex.gammaAnalyticSet`, the complement of the non-positive integers,
with `isOpen_gammaAnalyticSet`, `isPreconnected_gammaAnalyticSet`,
`Complex.differentiableOn_Gamma`, and `Complex.differentiableOn_digamma`.
* **Gauss' series** `ψ(s) = -γ + ∑ₙ (1/(n+1) - 1/(s+n))`
(`Complex.digamma_eq_gaussSeries`, `Real.digamma_eq_gaussSeries`,
`summable_gaussSeries`). The error is shown to vanish on the positive reals
(a finite partial-sum identity together with `abs_digamma_sub_log_le`) and to
be analytic off the poles, hence zero everywhere by the identity theorem.
`Mathlib/Analysis/Complex/RealDeriv.lean`
* `logDeriv_comp_ofReal`, `logDeriv_ofReal_comp`, relating the real and complex
logarithmic derivatives along the reals.
`Mathlib/Analysis/SpecialFunctions/Gamma/Deriv.lean`
* Real analogues of the existing complex lemmas: `Real.continuousAt_Gamma`,
and non-continuity/non-differentiability of `Real.Gamma` at the non-positive
integers.
Several complex analysis imports were added to `Digamma.lean` in order to justify the proof of the Gauss identity in the complex case.
The code was initially generated by an AI, and then heavily golfed and reviewed by the author.
[](https://gitpod.io/from-referrer/)
|
t-analysis |
434/23 |
Mathlib/Analysis/Complex/RealDeriv.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Digamma.lean |
3 |
4 |
['github-actions', 'mathlib-merge-conflicts', 'metakunt'] |
nobody |
7-8381 7 days ago |
7-9043 7 days ago |
38-17539 38 days |
0 |
| 41426 |
gmcninch-prof author:gmcninch-prof |
feat: add symmetric multilinear maps |
Define `SymmetricMap R M N ι`, the type of symmetric `R`-multilinear maps
from `ι → M` to `N` (i.e. multilinear maps invariant under permutation of
their arguments).
---
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- Nat.bit1_add_bit1
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- [ ] depends on: #xyz [optional extra text]
-->
The code is adapted from Kenny Lau's work
[here](https://github.com/kckennylau/EllipticCurve/blob/master/EllipticCurve/ProjectiveSpace/TensorProduct/SymmetricMap.lean)
-- see [`SymmetricMap`](https://github.com/gmcninch-prof/mathlib4/blob/symmetric-power-lift/Mathlib/LinearAlgebra/TensorProduct/SymmetricMap.lean).
This PR previously also contained the universal property / `lift` for
`SymmetricPower` (relating linear maps out of `Sym[R]^n M` to symmetric
multilinear maps), but per reviewer feedback on Zulip that work has been
split into a separate PR that depends on this one.
Zulip discussion [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/SymmetricPower.20universal.20property/near/608532652)
[](https://gitpod.io/from-referrer/)
|
t-algebra
new-contributor
label:t-algebra$ |
397/0 |
Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/SymmetricMap.lean |
2 |
10 |
['github-actions', 'gmcninch-prof', 'jcommelin'] |
kim-em assignee:kim-em |
7-6099 7 days ago |
96-23948 96 days ago |
97-78643 97 days |
1 |
| 42923 |
plp127 author:plp127 |
feat(FieldTheory/KummerExtension): criterion for `X ^ n - C a` to be irreducible for even `n` |
Prove the criterion for `X ^ n - C a` to be irreducible when `n` is not necessarily odd. This resolves a TODO.
---
- [x] depends on: #42344
- [x] depends on: #42886
<!-- Your PR title will become the first line of the commit message.
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[](https://gitpod.io/from-referrer/)
|
t-algebra
t-ring-theory
label:t-algebra$ |
201/33 |
Mathlib/FieldTheory/KummerExtension.lean |
1 |
9 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'plp127', 'tb65536', 'vihdzp'] |
nobody |
7-5508 7 days ago |
13-56842 13 days ago |
13-57649 13 days |
0 |
| 38482 |
dagurtomas author:dagurtomas |
feat(CategoryTheory/Tactic): specialize_map attribute |
Adds `@[specialize_map F]` to specialize morphism equalities to a chosen functor template, with whiskering and tensor functors as examples. It reuses the `map` proof generator and universe ordering, preserves explicit and instance binders, and supports custom suffixes and additional attributes.
---
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[](https://gitpod.io/from-referrer/)
|
LLM-generated
t-category-theory
t-meta
|
349/6 |
Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Map.lean,Mathlib/Tactic/CategoryTheory/SpecializeMap.lean,MathlibTest/CategoryTheory/SpecializeMap.lean |
5 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
7-5199 7 days ago |
29-27835 29 days ago |
29-27843 29 days |
1 |
| 41555 |
BryceT233 author:BryceT233 |
feat(Algebra/Order/Antidiagonal): connect `Finset.HasAntidiagonal` with `Filter.TendstoCofinite` |
This PR connects `Finset.HasAntidiagonal` with `Filter.TendstoCofinite` and cleans up `TendstoCofinite.lean`.
---
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- [x] depends on: #41521
[](https://gitpod.io/from-referrer/)
|
tech debt
t-algebra
label:t-algebra$ |
34/12 |
Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/Order/Filter/TendstoCofinite.lean |
2 |
14 |
['BryceT233', 'github-actions', 'jcommelin', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'plp127'] |
nobody |
7-4585 7 days ago |
7-6326 7 days ago |
43-4625 43 days |
0 |
| 42041 |
FrankieNC author:FrankieNC |
feat(Topology/MetricSpace): minkowski (box-counting) dimension |
Define the lower and upper Minkowski (box-counting) dimensions of a set in a pseudo-emetric space via covering numbers, prove the basic API (monotonicity, closure invariance, unions, finite sets), and show `dimH s ≤ lowerMinkowskiDim s ≤ upperMinkowskiDim s` (Falconer, Fractal Geometry, Ch. 3). |
t-topology |
354/0 |
Mathlib.lean,Mathlib/Topology/MetricSpace/Cover.lean,Mathlib/Topology/MetricSpace/CoveringNumbers.lean,Mathlib/Topology/MetricSpace/MinkowskiDimension.lean,docs/references.bib |
5 |
5 |
['github-actions', 'wwylele'] |
mcdoll assignee:mcdoll |
7-2838 7 days ago |
38-60879 38 days ago |
84-16976 84 days |
0 |
| 43307 |
Parcly-Taxel author:Parcly-Taxel |
feat: quaternion operations with respect to coordinates |
Add `QuaternionAlgebra.mk_{zero,one,natCast,intCast}` and `QuaternionAlgebra.{mk_mul_mk,star_mk}` as convenience lemmas for working with quaternions whose coordinates are explicitly given. These lemmas allow [the following code](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Transparency.20problem.20with.20quaternions/near/618254305) to work:
```lean
import Mathlib.Analysis.Quaternion
import Mathlib.NumberTheory.Real.GoldenRatio
noncomputable section
open goldenRatio Quaternion
/-- The unit icosian `(1 + i + j + k) / 2`, which has order 6. -/
def icosian6 : ℍˣ where
val := ⟨2⁻¹, 2⁻¹, 2⁻¹, 2⁻¹⟩
inv := ⟨2⁻¹, -2⁻¹, -2⁻¹, -2⁻¹⟩
val_inv := by norm_num
inv_val := by norm_num
/-- The unit icosian `(φ + i + ψ*j) / 2`, which has order 10. -/
def icosian10 : ℍˣ where
val := ⟨φ / 2, 2⁻¹, ψ / 2, 0⟩
inv := ⟨φ / 2, -2⁻¹, -ψ / 2, 0⟩
val_inv := by rw [mk_mul_mk, ← QuaternionAlgebra.mk_one]; grind
inv_val := by rw [mk_mul_mk, ← QuaternionAlgebra.mk_one]; grind
/-- The unit icosians. -/
def Icosian : Subgroup ℍˣ := Subgroup.closure {icosian6, icosian10}
``` |
t-algebra label:t-algebra$ |
18/0 |
Mathlib/Algebra/Quaternion.lean |
1 |
3 |
['Parcly-Taxel', 'github-actions', 'themathqueen'] |
nobody |
7-762 7 days ago |
45-37662 45 days ago |
45-37655 45 days |
0 |
| 44014 |
plp127 author:plp127 |
fix(Tactic/DeprecateTo): preserve whitespace |
Make `#deprecate to` directly edit the original source file text, instead of extracting the syntax and then using the pretty-printer to convert it back into a string, which destroys the original whitespace.
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|
t-meta |
111/46 |
Mathlib/Tactic/DeprecateTo.lean,MathlibTest/DeprecateTo.lean |
2 |
5 |
['JovanGerb', 'github-actions', 'mathlib-merge-conflicts', 'plp127'] |
nobody |
6-82143 6 days ago |
7-31690 7 days ago |
13-22812 13 days |
0 |
| 41882 |
theebayuser author:theebayuser |
feat(Data/List): decidability of HasPeriod and periods of repeated lists |
Hello, this PR extends `Mathlib/Data/List/PeriodicityLemma.lean` with:
* a `Decidable (List.HasPeriod w p)` instance (it is a prefix test), and
* two directions that relate periods to repetition:
* `hasPeriod_flatten_replicate` — `(replicate n l).flatten` has period `l.length`
* `eq_flatten_replicate_of_hasPeriod` — a word with period `p` and length `r * p` is the `r`-fold repetition of its length-`p` prefix.
This characterizes `r`-th powers of words by a period plus a length constraint, which a future follow-up PR that I plan to work on will use.
AI disclosure: This code was mostly generated by Claude Fable 5 and Opus 4.8 as part of my larger project on combinatorics on words, which I then reviewed and revised to contribute to mathlib.
|
t-data
LLM-generated
new-contributor
|
56/1 |
Mathlib/Data/List/PeriodicityLemma.lean |
1 |
8 |
['SnirBroshi', 'github-actions', 'theebayuser'] |
nobody |
6-76847 6 days ago |
6-77499 6 days ago |
90-69244 90 days |
0 |
| 44545 |
xroblot author:xroblot |
feat(NumberTheory/AddCharacter): the additive character attached to the trace |
Given a primitive `p`-th root of unity `ζ` in a ring `R`, and a commutative algebra `A` over `ZMod p`, this adds the additive character of `A` with values in `R` sending `x` to `ζ` raised to the trace of `x`.
The basic properties follow: the character is nontrivial, hence primitive, when `A` is a finite field, it is invariant under the Frobenius, it is compatible with extending the ring of values, and its values are congruent to `1` modulo any ideal containing `ζ - 1`.
This character will be used to construct the Gauss sums in Stickelberger's theorem.
:robot: This PR was extracted from the [SKW project](https://github.com/xroblot/SKW) by Claude.
|
t-number-theory |
144/0 |
Mathlib.lean,Mathlib/NumberTheory/AddCharacter/Trace.lean |
2 |
1 |
['github-actions'] |
nobody |
6-73781 6 days ago |
10-36861 10 days ago |
10-39914 10 days |
0 |
| 44679 |
Altabeh author:Altabeh |
feat(LinearAlgebra/FiniteDimensional/Lemmas): dimension counts in exa… |
Add dimension formulas for exact sequences of vector spaces over a division ring `K`:
* `Function.Exact.finrank_range_add_finrank_range`: if `A → B → C` is exact (maps `f`, `g`) and `B`
is finite-dimensional, then `finrank (range f) + finrank (range g) = finrank B`.
* `Function.Exact.linearEquivQuotientRangeProdKer`: if `A → B → C → D → E` is exact (maps
`f, g, h, j`), then `C ≃ₗ[K] (B ⧸ range f) × ker j`.
* `Function.Exact.finrank_eq_finrank_quotient_range_add_finrank_ker`: hence, when `B` and `D` are
finite-dimensional, `finrank C = finrank (B ⧸ range f) + finrank (ker j)`.
---
The splitting is noncomputable, meaning it picks a complement of `ker h` in `C`. These statements are the counting steps used, for example, when comparing Betti numbers along long exact sequences.
**These are basic results that have been written by myself. The only use of AI was to write the comments and test.** |
t-algebra
new-contributor
label:t-algebra$ |
34/0 |
Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean |
1 |
5 |
['Altabeh', 'github-actions', 'grunweg'] |
nobody |
6-72823 6 days ago |
7-21945 7 days ago |
7-24939 7 days |
0 |
| 43908 |
BryceT233 author:BryceT233 |
feat(Analysis/Normed/Module): real scalars on a complete normed `ℚ`-algebra |
We show that a complete normed `ℚ`-algebra carries a unique `NormedAlgebra ℝ 𝔸` structure.
---
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|
t-analysis |
65/0 |
Mathlib/Analysis/Normed/Module/Completion.lean |
1 |
1 |
['github-actions'] |
nobody |
6-68899 6 days ago |
29-7005 29 days ago |
29-6998 29 days |
0 |
| 44199 |
emlis42 author:emlis42 |
feat(Order): add `EReal.coe_cs{Sup, Inf}` |
This PR adds `WithTop.leftOrdContinuous_coe`, and adds `WithBotTop` and `EReal` version and `EReal.coe_c{s, i}{Sup, Inf}` as consequences.
Discussed here: [Is there code for X? > Lemmas relating `Real.toEReal` and `sSup`/`sInf` of images](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Lemmas.20relating.20.60Real.2EtoEReal.60.20and.20.60sSup.60.2F.60sInf.60.20of.20images/with/626667637) |
t-order
large-import
|
98/0 |
Mathlib/Data/EReal/Operations.lean,Mathlib/Order/CompleteLatticeIntervals.lean,Mathlib/Order/OrdContinuous.lean,Mathlib/Order/WithBotTop.lean |
4 |
10 |
['SnirBroshi', 'emlis42', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
6-46889 6 days ago |
6-46889 6 days ago |
20-75698 20 days |
0 |
| 43896 |
joelriou author:joelriou |
feat(Category): external products of derivability structures |
The external product of two left/right derivability structures is again a derivability structure (when one assumes that the properties of morphisms which appear contain identities).
This observation of mine (in 2023) was my main motivation for the formalization of derivability structures, because it would allow to formalize not only derived functors in one variable (see #43267), but also derived functors in several variables (like the tensor product, see https://github.com/joelriou/mathlib4/blob/jriou_localization/Mathlib/CategoryTheory/Localization/DerivabilityStructure/Monoidal.lean).
---
- [x] depends on: #43895
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|
t-category-theory
tech debt
|
149/0 |
Mathlib.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/Product.lean,Mathlib/CategoryTheory/Localization/Equivalence.lean,Mathlib/CategoryTheory/Localization/LocalizerMorphism.lean,Mathlib/CategoryTheory/Localization/Resolution.lean,Mathlib/CategoryTheory/Products/Basic.lean,docs/references.bib |
7 |
3 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
6-34876 6 days ago |
6-36224 6 days ago |
6-36219 6 days |
0 |
| 42314 |
sfingali author:sfingali |
feat(RingTheory): continuous valuations |
### Summary
Defines continuous valuations on topological rings: a valuation `v : A → Γ₀`
whose underlying function is continuous for the order topology on `Γ₀`
(Wedhorn, *Adic Spaces*, arXiv:1910.05934, Def. 7.7 and Rem. 7.8(1), p. 58).
* `ContinuousValuationClass` — the class of continuous valuations: a
`ValuationClass` whose functions are continuous.
* `ContinuousValuation` — a bundled continuous valuation.
* `ContinuousValuation.isOpen_lt` — the primary definition of Wedhorn,
Def. 7.7: `{a | v a < γ}` is open for every `γ`.
This is the second step of an adic/perfectoid pipeline (Huber rings → Huber
pairs → continuous valuations → Spa → perfectoid → tilting); #42312 defines
Huber rings. The subspace `Cont(A) ⊆ Spv(A)` of continuous valuations
(Wedhorn, p. 58) will build on `ValuationSpectrum` once #38009 lands — this
PR provides the element-level notion, which is independent of the spectrum
topology.
### References
* T. Wedhorn, *Adic Spaces*, arXiv:1910.05934, Def. 7.7, Rem. 7.8 (p. 58).
|
t-ring-theory
new-contributor
|
99/0 |
Mathlib.lean,Mathlib/RingTheory/Valuation/ContinuousValuation.lean |
2 |
8 |
['github-actions', 'jjdishere', 'sfingali', 'wwylele'] |
nobody |
6-25868 6 days ago |
77-10784 77 days ago |
77-11323 77 days |
0 |
| 43633 |
Jun2028 author:Jun2028 |
feat(SetTheory/Ordinal): classify exponential principal ordinals |
Complete `` TODO: Prove that the exponential principal ordinals are `0`, `1`, `2`, `ω`, or `ε_ x` `` in [Mathlib/SetTheory/Ordinal/Principal.lean](https://github.com/leanprover-community/mathlib4/compare/master...Jun2028:mathlib4:feat/exponential-principal-classification?expand=1#diff-c700a68af59d576bafeeeac5211181f9ce129bdead444df6c9747344817103bd)
By the way, the original TODO was wrong because `1` is not an exponential principal ordinal (it requires $0^0=1<1$ which is false).
---
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|
t-set-theory
new-contributor
maintainer-merge
|
65/6 |
Mathlib/SetTheory/Ordinal/Principal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean |
2 |
36 |
['Jun2028', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp'] |
nobody |
6-22646 6 days ago |
6-24464 6 days ago |
35-41162 35 days |
0 |
| 44647 |
JovanGerb author:JovanGerb |
chore(CategoryTheory/Limits/Preserves/Basic): use `to_dual` |
This PR uses `to_dual` for declarations about preserving limits and colimits.
---
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|
tech debt
t-category-theory
|
118/337 |
Mathlib/CategoryTheory/Functor/ReflectsIso/Basic.lean,Mathlib/CategoryTheory/Limits/Preserves/Basic.lean,Mathlib/CategoryTheory/NatTrans.lean |
3 |
2 |
['github-actions', 'joelriou'] |
nobody |
6-14259 6 days ago |
6-16091 6 days ago |
8-34158 8 days |
0 |
| 44255 |
mckoen author:mckoen |
feat(CategoryTheory/MorphismProperty): compatibility between morphism and object properties on arrow categories |
Given `W : MorphismProperty T`, defines `W.arrowObj : ObjectProperty (Arrow T)`. Similarly, given `W : ObjectProperty (Arrow T)`, defines `W.toMorphismProperty : MorphismProperty T`.
Shows that these define an order-isomorphism `MorphismProperty T ≃o ObjectProperty (Arrow T)`.
---
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|
t-category-theory |
41/0 |
Mathlib/CategoryTheory/MorphismProperty/Comma.lean |
1 |
4 |
['github-actions', 'joelriou'] |
dagurtomas assignee:dagurtomas |
6-10668 6 days ago |
6-11868 6 days ago |
8-82784 8 days |
2 |
| 42145 |
mckoen author:mckoen |
feat(CategoryTheory/Monoidal/Rigid): the double right dual functor is monoidal |
Defines the double right dual functor on a right rigid category, sending `X ↦ Xᘁᘁ`. We show that this functor is monoidal, so that in future PRs (#42150) we can define pivotal categories (rigid categories with a *monoidal* natural isomorphism between the double right dual and the identity).
Currently adds some new API which applies only to right duals. I'm not sure this should be dualized to left duals, as this could bloat the already large Rigid/Basic file
---
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|
t-category-theory |
293/12 |
Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Basic.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Braided.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Functor.lean |
4 |
23 |
['github-actions', 'joelriou', 'kim-em', 'mckoen', 'robin-carlier'] |
robin-carlier assignee:robin-carlier |
6-10603 6 days ago |
6-10649 6 days ago |
33-43063 33 days |
3 |
| 41769 |
mckoen author:mckoen |
feat(CategoryTheory/Abelian/Subobject): correspondence theorem for subobjects in abelian categories |
Given a subobject `Y` of `X` in an abelian category, we construct an order-isomorphism between subobjects of the "quotient" `X/Y := cokernel (Y ↪ X)` and subobjects of `X` containing `Y`.
Following Popescu's "Abelian Categories with Applications to Rings and Modules", a morphism `f : X ⟶ Y` induces a functor `Subobject X ⥤ Subobject Y` by `X' ↦ kernel (cokernel.π (X'.arrow ≫ f))`, and a functor `Subobject Y ⥤ Subobject X` by `Y' ↦ kernel (f ≫ cokernel.π Y'.arrow)`. We show these are equivalent to the existing, generic `Subobject.exists` and `Subobject.pullback` functors, and use these to define the correspondence.
---
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|
t-category-theory |
166/10 |
Mathlib/CategoryTheory/Abelian/ShortExact.lean,Mathlib/CategoryTheory/Abelian/Subobject.lean,docs/references.bib |
3 |
11 |
['github-actions', 'joelriou', 'justus-springer', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mckoen', 'tb65536'] |
robin-carlier assignee:robin-carlier |
6-8600 6 days ago |
6-11578 6 days ago |
37-41265 37 days |
1 |
| 43332 |
SnirBroshi author:SnirBroshi |
feat(SimpleGraph/Walk/Basic): walks with equal support have equal darts |
and similar statements:
- `p.darts = q.darts ↔ p.support = q.support` (equal)
- `p.darts <:+: q.darts ↔ p.support <:+: q.support` (infix)
- `p.darts <+: q.darts ↔ p.support <+: q.support` (prefix)
- `p.darts <:+ q.darts ↔ p.support <:+ q.support` (suffix)
---
I hope the review process can help golf these or find better proofs.
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|
t-combinatorics |
71/23 |
Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Subwalks.lean |
3 |
16 |
['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vlad902'] |
nobody |
6-6690 6 days ago |
6-7346 6 days ago |
44-10449 44 days |
0 |
| 31884 |
Thmoas-Guan author:Thmoas-Guan |
feat(RingTheory): definition of Gorenstein local ring |
In this PR, we gave basic definition of Gorenstein local ring and Gorestein ring and prove that they are stable under ring equiv.
---
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|
t-ring-theory |
82/0 |
Mathlib.lean,Mathlib/RingTheory/Gorenstein/Defs.lean |
2 |
12 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot'] |
mariainesdff assignee:mariainesdff |
6-6103 6 days ago |
85-74572 85 days ago |
85-77139 85 days |
7 |
| 36327 |
themathqueen author:themathqueen |
feat(Analysis/CStarAlgebra/Extreme): a C⋆-algebra is unital iff there exists an extreme point in the closed unit ball |
In a nonunital C⋆-algebra, the extreme points of the closed unit ball is nonempty iff the C⋆-algebra is unital. Our main reference for this is Sakai's "C⋆-algebras and W⋆-algebras" 1.6.1. The proof however is a _franken-proof_ from both Sakai and Pederson's "C⋆-algebras and their automorphism groups".
Co-authored-by: Jon Bannon <59937998+JonBannon@users.noreply.github.com>
Co-authored-by: Jireh Loreaux <loreaujy@gmail.com>
---
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- [x] depends on: #41923
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[](https://gitpod.io/from-referrer/)
|
t-analysis |
232/2 |
Mathlib/Analysis/CStarAlgebra/Extreme.lean |
1 |
46 |
['ADedecker', 'eric-wieser', 'github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'themathqueen'] |
ADedecker assignee:ADedecker |
6-6102 6 days ago |
16-34982 16 days ago |
62-20563 62 days |
0 |
| 40975 |
bwangpj author:bwangpj |
feat(LinearAlgebra): complex structures on real vector spaces |
Define complex structures,i .e. an `ℝ`-linear endomorphism `J` of a real vector space `V` with `J * J = -1`. |
t-algebra label:t-algebra$ |
93/0 |
Mathlib.lean,Mathlib/LinearAlgebra/Complex/Structure.lean |
2 |
5 |
['bwangpj', 'github-actions', 'grunweg', 'themathqueen', 'wwylele'] |
kim-em assignee:kim-em |
6-6099 6 days ago |
115-15069 115 days ago |
115-15062 115 days |
0 |
| 41781 |
teng10 author:teng10 |
feat(Algebra/Representation): add abstract permutation action in TensorPower |
Hello, I'm a new contributor. I had an introduction here on [zulip](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Introduction.3A.20Schur.20Weyl.20Duality/with/607194314)
This PR is a first step in formalizing Shur Weyl duality, which I got feedback that it would be useful to mathlib. The final statement I had in mind has the form
/--
The centralizer of `{g^{⊗k} | g ∈ End(V)}`equals `Span{W_σ | σ ∈ S_k}`, for all dimensions `d` and tensor powers `k`.
---/
This PR tries to define permutation action on TensorPower; define permutation image space.
An initial version of the definition is more specific to the Euclidean space (for reference I list them below)
```
open scoped TensorProduct
variable {d : ℕ} {k : ℕ}
/-- The `k`-fold tensor power of `ℂ^d`, defined as `⨂[ℂ] (i : Fin k), (Fin d → ℂ)`. -/
abbrev PiTensorPower (d k : ℕ) : Type :=
PiTensorProduct ℂ (fun (_ : Fin k) => (Fin d → ℂ))
/-- The permutation operator `W_σ` on the tensor power `V^{⊗k}`.
Given `σ : Equiv.Perm (Fin k)`, this acts by permuting the tensor factors:
`W_σ (v₁ ⊗ ⋯ ⊗ vₖ) = v_{σ⁻¹(1)} ⊗ ⋯ ⊗ v_{σ⁻¹(k)}`. -/
def permAction (d : ℕ) {k : ℕ} (σ : Equiv.Perm (Fin k)) :
PiTensorPower d k ≃ₗ[ℂ] TensV d k :=
PiTensorProduct.reindex ℂ (fun (_ : Fin k) => (Fin d → ℂ)) σ
/-- The set of permutation operators in `End(V^{⊗k})`. -/
def permImage (d k : ℕ) : Set (Module.End ℂ (TensV d k)) :=
Set.range (fun σ : Equiv.Perm (Fin k) => (permAction d σ).toLinearMap)
```
LLM acknowledgement: I have used aristotle to write these definitions. However, I am very motivated to learn how to write proper code. I have looked more into `PiTensorProduct` and `TensorPower` module and came to the abstract version in the PR. I tried to ask aristotle about how it's defining things and whether it's suitable for mathlib.
And I would very much appreciate your thoughts on how appropriate these definitions are. Thanks for your time!
Yanting
---
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|
t-algebra
LLM-generated
new-contributor
will-close-soon
label:t-algebra$ |
22/0 |
Mathlib/LinearAlgebra/TensorPower/Basic.lean |
1 |
5 |
['github-actions', 'joelriou', 'teng10'] |
kim-em assignee:kim-em |
6-6098 6 days ago |
93-38510 93 days ago |
93-38519 93 days |
0 |
| 43859 |
kebekus author:kebekus |
feat: Jensen-Type Inequality for Circle Averages |
In preparation for the upcoming proof of Nevanlinna's "Lemma on Logarithmic Derivatives", establish a Jensen-type inequality for circle averages, where the positive part of the logarithm plays the role of the concave function.
---
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|
t-measure-probability
LLM-generated
|
93/0 |
Mathlib.lean,Mathlib/Analysis/Complex/ValueDistribution/LogDerivLemma.lean,Mathlib/Analysis/Convex/SpecificFunctions/Basic.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean |
4 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
RemyDegenne assignee:RemyDegenne |
6-6093 6 days ago |
6-54021 6 days ago |
29-78286 29 days |
0 |
| 43904 |
t4v1 author:t4v1 |
feat(MeasureTheory/Constructions/HaarToSphere): polar coordinates for lintegral |
`Measure.measurePreserving_homeomorphUnitSphereProd` represents an additive Haar measure on a nontrivial finite-dimensional normed space `E` as the product of the sphere measure `μ.toSphere` and Lebesgue measure on `(0, ∞)` with density `r ^ (dim E - 1)`. The file exposes it only through the radial corollaries `integrable_fun_norm_addHaar`, `integrableOn_fun_norm_addHaar` and `integral_fun_norm_addHaar`, all for integrands of the form `f ‖x‖`.
This PR adds the general `lintegral` form, for an arbitrary measurable `f : E → ℝ≥0∞`:
* `lintegral_addHaar_eq_lintegral_toSphere_lintegral_Ioi`:
`∫⁻ x, f x ∂μ = ∫⁻ ω, ∫⁻ r in Ioi 0, ENNReal.ofReal (r ^ (dim E - 1)) * f (r • ω) ∂μ.toSphere`;
* `setLIntegral_ball_eq_lintegral_toSphere_lintegral_Ioo`: the same for `∫⁻ y in ball c R, f y ∂μ`, with the radial integral over `Ioo 0 R` and the rays emanating from `c`.
Both are needed for Morrey's inequality (follow-up PR), whose two analytic steps integrate non-radial functions in polar coordinates; they are stated here on their own because they are independent of it.
The proofs were developed with the help of an LLM (Claude Code) and then checked and edited by the author, who takes responsibility for every line.
|
t-measure-probability
new-contributor
LLM-generated
|
47/0 |
Mathlib/MeasureTheory/Constructions/HaarToSphere.lean |
1 |
3 |
['github-actions', 't4v1'] |
RemyDegenne assignee:RemyDegenne |
6-6092 6 days ago |
29-17122 29 days ago |
29-17115 29 days |
1 |
| 42667 |
gasparattila author:gasparattila |
chore: make `Set.inclusion` semireducible |
It is currently an abbrev, which confuses `fun_prop` due to dependent types in lemmas like `Topology.IsEmbedding.inclusion`. After this change, `fun_prop` will be able to prove goals like `IsEmbedding f → IsEmbedding (Set.inclusion h ∘ f)`.
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|
t-data |
18/15 |
Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Combinatorics/Compactness.lean,Mathlib/Data/Set/Inclusion.lean,Mathlib/Data/Set/UnionLift.lean,Mathlib/Logic/Equiv/Set.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/ModelTheory/Substructures.lean,Mathlib/Order/CountableDenseLinearOrder.lean,Mathlib/Topology/Category/TopCat/Opens.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean |
12 |
4 |
['gasparattila', 'github-actions', 'plp127'] |
nobody |
6-5198 6 days ago |
43-23868 43 days ago |
43-64788 43 days |
0 |
| 40963 |
Formalistic03 author:Formalistic03 |
feat(Combinatorics/SimpleGraph/Paths): add lemma about the first dart if dropLast is a path |
If `dropLast` of a walk is a path, a dart of the walk sharing its first vertex with the walk also shares its second vertex.
I thought this was a natural more general form of `IsPath.eq_snd_of_mem_edges`, useful for cycles for example.
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics
new-contributor
maintainer-merge
|
46/0 |
Mathlib/Combinatorics/SimpleGraph/Dart.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean |
4 |
38 |
['Formalistic03', 'SnirBroshi', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
6-4185 6 days ago |
6-64738 6 days ago |
95-30583 95 days |
0 |
| 43804 |
JovanGerb author:JovanGerb |
feat(Algebra/Homology/ShortComplex/Basic): use `to_dual` |
Use `to_dual` for `ShortComplex`.
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- [x] depends on: #43750
[](https://gitpod.io/from-referrer/)
|
tech debt
t-algebra
label:t-algebra$ |
45/37 |
Mathlib/Algebra/Homology/ShortComplex/Basic.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Zero.lean |
2 |
6 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
5-84757 5 days ago |
7-49104 7 days ago |
7-49739 7 days |
1 |
| 43570 |
kim-em author:kim-em |
refactor(AlgebraicGeometry/Modules): transport pushforward along Opens.map functoriality isos |
This PR defines `Scheme.Modules.pushforwardId` and `pushforwardComp` by transporting the sheaf-of-modules isomorphisms along the existing `Opens.mapId` and `Opens.mapComp` (via `SheafOfModules.pushforwardCongr₂`) rather than by identifying `Opens.map (𝟙 X).base` with `𝟭` and `Opens.map (f ≫ g).base` with `Opens.map g.base ⋙ Opens.map f.base` by unfolding `Opens.map`. The componentwise simp lemmas become `M.presheaf.map_id` rather than `rfl`, and the pseudofunctor coherence fields are discharged explicitly since `cat_disch` no longer finds them by reflexivity. Also adds the simp lemma `Adj.eqToHom_τl`.
It is extracted from Paul Reichert's experiment making `Functor.comp` and `Functor.id` `instance_reducible` (https://github.com/leanprover-community/mathlib4/compare/master...leanprover-community:mathlib4-nightly-testing:datokrat/functorcomp, discussed at https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/backward.2EisDefEq.2ErespectTransparency), and depends on https://github.com/leanprover-community/mathlib4/pull/43569. The diff relative to that PR is https://github.com/kim-em/mathlib4/compare/associators-sheaves...opens-map.
🤖 Prepared with Claude Code |
tech debt |
516/139 |
Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pullback.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PushforwardContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean,Mathlib/AlgebraicGeometry/Modules/Sheaf.lean,Mathlib/CategoryTheory/Adjunction/CompositionIso.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Adj.lean,Mathlib/Topology/Sheaves/Module.lean |
10 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
5-82927 5 days ago |
19-1101 19 days ago |
37-9180 37 days |
0 |
| 43565 |
Parcly-Taxel author:Parcly-Taxel |
refactor(Archive/FriendshipGraphs): golf everything |
Also remove the file's `set_option`s and `@[expose]`. Like #43434, no deprecations are added since this is a leaf file in Archive. |
tech debt |
103/293 |
Archive/Wiedijk100Theorems/FriendshipGraphs.lean |
1 |
8 |
['Parcly-Taxel', 'SnirBroshi', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
5-82856 5 days ago |
20-48059 20 days ago |
38-83806 38 days |
0 |
| 42536 |
JovanGerb author:JovanGerb |
fix(Linter/UnusedTactic): don't use `IO.Ref` for extensibility |
This PR cleans up the unused tactic linter extensibility implementation. Previously, this was implemented using a `PersistentEnvExtension` and an `IO.Ref`. The problem with the `IO.Ref` is that it creates "spooky action at a distance": a command later in the file can affect what happens earlier in the file. Instead, we can allow both local and global modifications using a `SimpleScopedEnvExtension`.
Previously, the list of exceptions was unnaturally split into the two files. This PR makes it into just a single list.
Additionally:
- `#allow_unused_tactic` is deprecated in favour of `allow_unused_tactic`
- We put a namespace around the `change?` syntax, so that `change?` is not anymore a declared constant.
---
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|
file-removed
t-linter
maintainer-merge
|
122/142 |
Mathlib.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Change.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,Mathlib/Tactic/Linter/UnusedTacticExtension.lean,MathlibTest/Linter/UnusedTactic.lean |
7 |
26 |
['JovanGerb', 'adomani', 'github-actions', 'grunweg', 'leanprover-radar', 'mathlib-merge-conflicts', 'thorimur'] |
thorimur assignee:thorimur |
5-81154 5 days ago |
7-43668 7 days ago |
24-83942 24 days |
0 |
| 44740 |
user202729 author:user202729 |
chore(Algebra/Ring/CompTypeclasses): fix a typo and reformat slightly |
Change `σ₂₃` to `σ` in the header, this one is clearly a typo.
Do some minor reformatting for the rest of the file, which I think make it nicer.
---
|
t-algebra
new-contributor
label:t-algebra$ |
7/11 |
Mathlib/Algebra/Ring/CompTypeclasses.lean |
1 |
3 |
['github-actions', 'user202729', 'vihdzp'] |
nobody |
5-76779 5 days ago |
5-80448 5 days ago |
5-80441 5 days |
0 |
| 44743 |
vihdzp author:vihdzp |
refactor(Wiedijk100Theorems/AreaOfACircle): deprecate file |
The area formula for circles exists within Mathlib already, and in fact we also have formulas for the volume of an n-sphere. So we deprecate the file on the archive, in favor for the Mathlib theorem.
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Not sure if this is the right thing to do. Maybe we could change the link on 100.yaml, but still keep the archive file as an alternate proof of a similar result?
|
t-measure-probability |
16/5 |
Archive/Wiedijk100Theorems/AreaOfACircle.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,docs/100.yaml |
3 |
1 |
['github-actions'] |
nobody |
5-76732 5 days ago |
5-77926 5 days ago |
5-77919 5 days |
0 |
| 40266 |
WangJiabai author:WangJiabai |
feat(RingTheory/MvPolynomial): define generic determinantal ideals |
This PR adds a foundational API for determinantal ideals of the generic matrix.
It defines `Matrix.MinorIndex`, the corresponding minors of the existing generic
matrix `Matrix.mvPolynomialX`, the finite set of all `t × t` generic minors, and
the ideal generated by these minors in `MvPolynomial (Fin m × Fin n) R`.
It also proves basic membership, evaluation, coefficient-map/base-change, and
finite-generation lemmas.
This PR intentionally does not include the Sturmfels/KRS/straightening/Groebner
part of the development.
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Additional context:
This is extracted and refactored from a standalone project on determinantal
ideals and the Gröbner-basis theorem for generic determinantal ideals:
https://github.com/WangJiabai/Determinantal-Ideals-Formalization
The current PR is intentionally limited to the small foundational API for
generic minors and generic determinantal ideals.
AI use:
ChatGPT was used for planning/refactoring discussion, and Codex was used to
draft some proof scripts. I reviewed the statements and proofs and am
responsible for the submitted code.
[](https://gitpod.io/from-referrer/)
|
t-ring-theory
new-contributor
LLM-generated
|
178/0 |
Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/RingTheory/MvPolynomial/DeterminantalIdeal.lean |
3 |
26 |
['WangJiabai', 'github-actions', 'jjdishere', 'tb65536'] |
jjdishere assignee:jjdishere |
5-64830 5 days ago |
5-66233 5 days ago |
132-50963 132 days |
0 |
| 43722 |
tb65536 author:tb65536 |
refactor: replace `padicValNat` with `multiplicity` |
This doesn't fully deprecate `padicValNat`, but gets most of the way there. Full deprecation will be in a follow-up PR.
I directly replaced "padicValNat" with "multiplicity" in the declaration names. A few declarations of the form `padicValNat.foo` were manually renamed to `Nat.multiplicity_foo`.
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|
t-algebra
t-number-theory
label:t-algebra$ |
486/295 |
Archive/Imo/Imo2025Q3.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/Defs.lean,Mathlib/Data/Nat/PadicValNat.lean,Mathlib/NumberTheory/Harmonic/Int.lean,Mathlib/NumberTheory/Multiplicity.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/NumberTheory/Padics/MahlerBasis.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/Padics/PadicVal/Basic.lean,Mathlib/NumberTheory/Padics/PadicVal/Defs.lean,Mathlib/NumberTheory/SumTwoSquares.lean,Mathlib/RingTheory/DividedPowers/Padic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean |
15 |
12 |
['Multramate', 'b-mehta', 'github-actions', 'mathlib-merge-conflicts', 'tb65536'] |
nobody |
5-63054 5 days ago |
5-64630 5 days ago |
33-46678 33 days |
0 |
| 44161 |
tb65536 author:tb65536 |
refactor(Analysis/Normed/Unbundled/SeminormFromConst): deprecate `seminormFromConst'` |
Currently `seminormFromConst'` is a plain function, and `seminormFromConst` is the same function as ring seminorm under additional assumptions. But it turns out that these additional assumptions are not necessary.
This PR removes these additional assumptions and deprecates `seminormFromConst'`.
This required tinkering with the API slightly, so I also took the liberty of cleaning up some of these pre-`grw` proofs.
---
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|
t-analysis |
128/142 |
Mathlib/Analysis/Normed/Unbundled/IsPowMulUnique.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromConst.lean |
2 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
5-62740 5 days ago |
5-63314 5 days ago |
21-78619 21 days |
1 |
| 44754 |
ajirving author:ajirving |
feat(Analysis/Complex): existence of analytic logs and roots |
Extends the results in BranchLogRoot.lean to construct logs and nth roots of analytic functions. This required a new inverse function theorem lemma, analyticAt_comp_iff_right_of_deriv_ne_zero. This is similar to the existing analyticAt_comp_iff_of_deriv_ne_zero: the new result gives analyticity of the right factor of the composition whereas the existing result gives the left. Perhaps better names are needed to distinguish these two similar results.
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|
t-analysis |
50/1 |
Mathlib/Analysis/Calculus/InverseFunctionTheorem/Analytic.lean,Mathlib/Analysis/Complex/BranchLogRoot.lean |
2 |
2 |
['github-actions'] |
nobody |
5-61399 5 days ago |
5-63423 5 days ago |
5-63416 5 days |
0 |
| 44704 |
keithadler author:keithadler |
fix(Algebra/Category/MonCat): state the `CommMonCat` limit instances for `CommMonCat` |
`CommMonCat.forget_createsLimits*` (and the additive versions) were stated for `forget MonCat`, copied from the `MonCat` section, so `CommMonCat` had no such instances. This states them for `forget CommMonCat`, which needs `[UnivLE.{v, u}]` as for `forget_preservesLimitsOfSize`.
---
For reviewers: the `UnivLE` assumption is there because the `CommMonCat` `CreatesLimit` instance assumes the limit is `Small`; dropping it would mean reproving `forget₂CreatesLimit` without that assumption, which this PR does not attempt. #41551 edits the `noncomputable` keyword on the same lines, so whichever merges second needs a small rebase.
Found with [lean-linter](https://github.com/keithadler/lean-linter). Prepared with AI assistance (Claude); I checked the change and the build.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
t-algebra
LLM-generated
new-contributor
maintainer-merge
label:t-algebra$ |
5/5 |
Mathlib/Algebra/Category/MonCat/Limits.lean |
1 |
6 |
['github-actions', 'grunweg', 'keithadler'] |
nobody |
5-54515 5 days ago |
6-25481 6 days ago |
6-25474 6 days |
0 |
| 44668 |
justus-springer author:justus-springer |
chore(*): fix citation links split across lines |
CommonMark (the Markdown standard that's used in doc-gen) does not allow line breaks between link text and link label (this behavior is documented [here](https://spec.commonmark.org/0.31.2/#example-543)). That means these citations don't get rendered correctly. The fix is to add line break before the end of the link label.
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|
LLM-generated |
26/28 |
Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Jordan/Basic.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/Geometry/Manifold/Submersion.lean,Mathlib/GroupTheory/Subsemigroup/Center.lean,Mathlib/ModelTheory/Basic.lean,Mathlib/NumberTheory/Pell.lean,Mathlib/RingTheory/Polynomial/Chebyshev.lean,Mathlib/RingTheory/ZMod/UnitsCyclic.lean,Mathlib/Topology/MetricSpace/Snowflaking.lean |
13 |
7 |
['Multramate', 'github-actions', 'justus-springer'] |
nobody |
5-53747 5 days ago |
5-55628 5 days ago |
6-4052 6 days |
0 |
| 44355 |
artie2000 author:artie2000 |
chore(Order): move Order/CompleteLattice/SetLike.lean to more descriptive location |
Order/CompleteLattice/SetLike.lean -> Order/CompleteSublattice/SetLike.lean
Order/CompleteSublattice.lean -> Order/CompleteSublattice/Basic.lean
This clears the file location for the material in #44253
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|
file-removed |
5/5 |
Mathlib.lean,Mathlib/Order/CompleteSublattice/Basic.lean,Mathlib/Order/CompleteSublattice/SetLike.lean,Mathlib/RingTheory/SimpleModule/Isotypic.lean,Mathlib/SetTheory/Descriptive/Tree.lean |
5 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
5-49585 5 days ago |
5-50489 5 days ago |
14-52686 14 days |
1 |
| 42844 |
plp127 author:plp127 |
refactor(Logic/Hydra): cleanup file |
Change the definition of `CutExpand` to be more correct. Rename some theorems and add some theorems.
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[](https://gitpod.io/from-referrer/)
|
t-logic |
101/50 |
Mathlib/Logic/Hydra.lean |
1 |
8 |
['github-actions', 'mathlib-merge-conflicts', 'plp127', 'vihdzp'] |
nobody |
5-48499 5 days ago |
5-49175 5 days ago |
59-9365 59 days |
0 |
| 44610 |
plp127 author:plp127 |
chore: dualize `HeytingAlgebra` more |
Use `to_dual_for` to connect `GeneralizedHeytingAlgebra.mk` and `GeneralizedHeytingAlgebra.le_himp_iff` with their duals. Also dualize some `BiheytingAlgebra` declarations.
---
- [x] depends on: #44608
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|
t-order |
37/84 |
Mathlib/Order/Heyting/Basic.lean |
1 |
3 |
['github-actions', 'mathlib-dependent-issues', 'plp127'] |
nobody |
5-47858 5 days ago |
5-57605 5 days ago |
5-57851 5 days |
2 |
| 44762 |
Julian-Kuelshammer author:Julian-Kuelshammer |
feat(Combinatorics/Enumerative/Catalan/BracketingFunction): adds Huang-Tamari's bracketing functions |
This PR defines bracketing functions, an elementary description of the Tamari lattice. This PR is intentially kept short and just adds the definition and a bit of basic API. There are potential follow-ups proving that these are counted by the Catalan numbers and giving the lattice instance, for a preview see https://github.com/Julian-Kuelshammer/ExtensionClosedSubcategoriesOfAn/blob/main/ExtensionClosedSubcategoriesOfAn/BracketingFunctions.lean
A first version of the file was created with the help of Aristotle and Claude.
---
|
new-contributor
t-combinatorics
LLM-generated
|
102/0 |
Mathlib.lean,Mathlib/Combinatorics/Enumerative/Catalan/BracketingFunction.lean |
2 |
4 |
['Julian-Kuelshammer', 'github-actions'] |
nobody |
5-47264 5 days ago |
5-47832 5 days ago |
5-48219 5 days |
0 |
| 43708 |
Thmoas-Guan author:Thmoas-Guan |
feat(RingTheory): definition of Koszul complex |
Definition of Koszul cocomplex.
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory |
188/0 |
Mathlib.lean,Mathlib/RingTheory/KoszulComplex/Complex.lean |
2 |
3 |
['Whysoserioushah', 'github-actions'] |
nobody |
5-44341 5 days ago |
35-57502 35 days ago |
35-57495 35 days |
3 |
| 43707 |
Thmoas-Guan author:Thmoas-Guan |
feat(RingTheory): definition of Koszul cocomplex |
Definition of Koszul complex.
---
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory |
172/0 |
Mathlib.lean,Mathlib/RingTheory/KoszulComplex/Cocomplex.lean |
2 |
1 |
['github-actions'] |
nobody |
5-44319 5 days ago |
35-57505 35 days ago |
35-57498 35 days |
2 |
| 40948 |
Thmoas-Guan author:Thmoas-Guan |
feat(LinearAlgebra): exterior power commute with base change |
In this PR, we added the commute of exterior power and base change.
AI usage: filling in construction of the final equivalence with lemmas decribing it, all the preliminary constructions are refactored by human later.
Co-authored-by: Zichen Wang <zichenwang25@stu.pku.edu.cn>
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- [ ] depends on: #44604
[](https://gitpod.io/from-referrer/)
|
t-algebra
LLM-generated
label:t-algebra$ |
166/0 |
Mathlib.lean,Mathlib/LinearAlgebra/ExteriorPower/BaseChange.lean |
2 |
19 |
['Thmoas-Guan', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'ocfnash'] |
joelriou assignee:joelriou |
5-43284 5 days ago |
5-43284 5 days ago |
109-38975 109 days |
1 |
| 44773 |
justus-springer author:justus-springer |
doc(*): add bib entries for free-text references |
The result of an LLM-assisted audit to find free-text references with no entry in `references.bib`. Most bib entries come from zbmath (those have a `zbl` entry). A few didn't have an entry there, so they come from other sources.
Some small notes:
- I added the other authors to `boldetal2017`,
- In `LinearAlgebra/Matrix/Polynomial.lean`, my LLM flagged that Section 5.3 is probably not the appropriate section to cite for this file, and in fact, it seems to be a historical artifact. I checked the paper and Proposition 2.2 fits much better here, so I changed it.
- Wittlich's Master thesis is not available online, but the docstring came from a trustworthy source so I just used the details given there for the bib entry.
---
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|
LLM-generated |
284/33 |
Mathlib/Analysis/CStarAlgebra/Module/Defs.lean,Mathlib/Analysis/InnerProductSpace/Defs.lean,Mathlib/Analysis/InnerProductSpace/Projection/Basic.lean,Mathlib/CategoryTheory/Adjunction/Lifting/Left.lean,Mathlib/CategoryTheory/Adjunction/Lifting/Right.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Combinatorics/Additive/CauchyDavenport.lean,Mathlib/Combinatorics/Compactness.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/Basic.lean,Mathlib/InformationTheory/Coding/Kraft.lean,Mathlib/InformationTheory/Coding/KraftMcMillan.lean,Mathlib/LinearAlgebra/Matrix/Adjugate.lean,Mathlib/LinearAlgebra/Matrix/Polynomial.lean,Mathlib/MeasureTheory/Measure/Haar/Basic.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean,Mathlib/Probability/Independence/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/Defs.lean,Mathlib/Topology/Category/Compactum.lean,docs/references.bib |
21 |
1 |
['github-actions'] |
nobody |
5-38669 5 days ago |
5-40591 5 days ago |
5-40584 5 days |
0 |
| 44674 |
justus-springer author:justus-springer |
doc(*): fix citation key typos |
Fixes malformed citation keys so they point to the correct reference. I believe all of these are just typos, with possibly one exceptions: `diestel2017` may be pointing to the older edition of the book (we only have the 2025 edition in references.bib). I checked the new edition, and Section 1.9 still covers bonds, so this is still a valid comment.
- [x] depends on: #44758
---
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|
LLM-generated |
53/51 |
Mathlib/Algebra/Homology/HomotopyCategory/KInjective.lean,Mathlib/Algebra/Homology/HomotopyCategory/KProjective.lean,Mathlib/Algebra/Homology/LocalCohomology.lean,Mathlib/AlgebraicGeometry/Noetherian.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicTopology/SimplicialCategory/Basic.lean,Mathlib/Analysis/SpecialFunctions/Bernstein.lean,Mathlib/CategoryTheory/Bicategory/Grothendieck.lean,Mathlib/CategoryTheory/FiberedCategory/Grothendieck.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/PullbackObjObj.lean,Mathlib/Combinatorics/Graph/Connected/EdgeCut.lean,Mathlib/Computability/TuringDegree.lean,Mathlib/GroupTheory/Focal.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Basic.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/NNReal.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean,Mathlib/MeasureTheory/Measure/PreVariation.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Galois.lean,Mathlib/Order/PrimeSeparator.lean,Mathlib/Probability/Kernel/Deterministic.lean,Mathlib/RingTheory/DividedPowers/RatAlgebra.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/LittleWedderburn.lean,Mathlib/Topology/UniformSpace/Ultra/Basic.lean,docs/references.bib |
31 |
13 |
['Multramate', 'github-actions', 'grunweg', 'justus-springer', 'mathlib-dependent-issues'] |
nobody |
5-35015 5 days ago |
5-35018 5 days ago |
5-47528 5 days |
0 |
| 44774 |
xroblot author:xroblot |
feat(Algebra/QuadraticAlgebra): integral elements of quadratic algebras |
We characterize the elements of a quadratic algebra `QuadraticAlgebra K a b` that are integral over a subring `R` of `K` in which `R` is integrally closed: they are exactly the elements whose trace and norm lie in `R` (`QuadraticAlgebra.isIntegral_iff`).
Along the way, we add conjugation as an algebra automorphism, `QuadraticAlgebra.starAlgEquiv`.
Prepared with Claude Code 🤖
|
t-algebra label:t-algebra$ |
105/0 |
Mathlib.lean,Mathlib/Algebra/QuadraticAlgebra/Basic.lean,Mathlib/Algebra/QuadraticAlgebra/Integral.lean |
3 |
1 |
['github-actions'] |
nobody |
5-34813 5 days ago |
5-35705 5 days ago |
5-36700 5 days |
5 |
| 38716 |
YaelDillies author:YaelDillies |
feat(Algebra/Order): `NNRat.cast_sub` |
From AddCombi
---
- [x] depends on: #41850
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|
t-algebra label:t-algebra$ |
13/2 |
Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Data/NNRat/Defs.lean |
2 |
2 |
['github-actions', 'mathlib-dependent-issues'] |
riccardobrasca assignee:riccardobrasca |
5-29694 5 days ago |
84-62612 84 days ago |
84-68890 84 days |
2 |
| 43612 |
YaelDillies author:YaelDillies |
feat(Geometry/Convex): `positivity` extension for `StdSimplex.weights` |
Also add some Qq helper to Qq-match a type with `Finsupp`.
From the Polyhedra in Berlin workshop where people would have found it useful for `positivity` to close some goals.
Generated by Claude Opus in a few prompts worth of review.
Assisted-by: Claude Opus 5
---
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|
t-convex-geometry
t-meta
|
124/6 |
Mathlib/Data/Finsupp/Defs.lean,Mathlib/Geometry/Convex/ConvexSpace/Defs.lean,Mathlib/Util/Qq.lean,MathlibTest/Tactic/Positivity.lean |
4 |
28 |
['Vierkantor', 'YaelDillies', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-merge-conflicts'] |
grunweg assignee:grunweg |
5-28688 5 days ago |
5-31526 5 days ago |
30-22005 30 days |
1 |
| 43261 |
YaelDillies author:YaelDillies |
feat(Geometry/Convex): cancellative convex spaces |
Define cancellative convex spaces as those space where non-trivial convex combinations are injective in any of their inputs. Show that modules, affine spaces, products of cancellative convex spaces, subspaces of cancellative convex spaces... are cancellative convex spaces.
Cancellative convex spaces are the correct setting for a large number of convexity concepts. Such a convex space embeds into some (canonical) affine space and therefore satisfies the geometrically intuitive properties of convexity. Non-cancellative convex spaces are pathological from the point of view of polytope theory.
[nLab](https://ncatlab.org/nlab/show/convex+space)
Generated by Claude Opus, reviewed and golfed by myself.
From the Polytopes in Berlin workshop, where participants were confused whether they could generalise their results from affine spaces to convex spaces.
Assisted-by: Claude Opus 5
---
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|
t-convex-geometry
LLM-generated
|
208/14 |
Mathlib/Algebra/Order/GroupWithZero/Basic.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Geometry/Convex/ConvexSpace/AffineSpace.lean,Mathlib/Geometry/Convex/ConvexSpace/Defs.lean,Mathlib/Geometry/Convex/ConvexSpace/Module.lean,Mathlib/Geometry/Convex/ConvexSpace/Prod.lean,Mathlib/Geometry/Convex/Set.lean |
7 |
11 |
['YaelDillies', 'b-mehta', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
5-27867 5 days ago |
5-31084 5 days ago |
41-3505 41 days |
2 |
| 44448 |
thefundamentaltheor3m author:thefundamentaltheor3m |
feat(Data/Nat/Choose/Bounds): an upper-bound for functions with Ramse… |
…y numer-like upper-bounds
I am a little unsure about the naming and the location, but it seems like it would be useful for anything to do with Ramsey numbers or Erdos-Szekeres numbers, except it applies to any function satisfying that kind of recursive upper-bound.
---
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|
t-data |
14/0 |
Mathlib/Data/Nat/Choose/Bounds.lean |
1 |
6 |
['SnirBroshi', 'github-actions', 'thefundamentaltheor3m'] |
nobody |
5-15800 5 days ago |
13-77209 13 days ago |
13-82280 13 days |
0 |
| 41540 |
plp127 author:plp127 |
chore: rename arguments of `Nat.strong_induction_on` |
Name the motive `motive` and name the minor premises according to the case. Also rename for `Fin.strong_induction_on`.
---
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|
|
67/71 |
Archive/Imo/Imo1981Q3.lean,Archive/Imo/Imo2024Q3.lean,Mathlib/Algebra/ContinuedFractions/Euler.lean,Mathlib/Algebra/Lie/LieTheorem.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean,Mathlib/Algebra/Polynomial/Sequence.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Combinatorics/Enumerative/Bell.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean,Mathlib/Computability/Language.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Nat/Digits/Lemmas.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/Nat/Nth.lean,Mathlib/FieldTheory/IsRealClosed/Basic.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/GroupTheory/GroupAction/Jordan.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/LinearAlgebra/Eigenspace/Triangularizable.lean,Mathlib/LinearAlgebra/Finsupp/Pi.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Defs.lean,Mathlib/NumberTheory/Bernoulli.lean,Mathlib/NumberTheory/BernoulliPolynomials.lean,Mathlib/NumberTheory/DiophantineApproximation/Basic.lean,Mathlib/NumberTheory/ModularForms/LevelOne/DimensionFormula.lean,Mathlib/NumberTheory/Pell.lean,Mathlib/NumberTheory/Primorial.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Etale/QuasiFinite.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Quotient/Nilpotent.lean,Mathlib/RingTheory/IntegralClosure/IsIntegral/AlmostIntegral.lean,Mathlib/RingTheory/LittleWedderburn.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean,Mathlib/RingTheory/Polynomial/IsIntegral.lean,Mathlib/RingTheory/Polynomial/Nilpotent.lean,Mathlib/RingTheory/Polynomial/Resultant/Basic.lean,Mathlib/RingTheory/WittVector/Defs.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/StructurePolynomial.lean,Mathlib/RingTheory/ZariskisMainTheorem.lean,Mathlib/SetTheory/Cardinal/NatCard.lean,Mathlib/Topology/Metrizable/Uniformity.lean |
54 |
4 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
5-12248 5 days ago |
5-17051 5 days ago |
65-83824 65 days |
0 |
| 44783 |
ZRTMRH author:ZRTMRH |
feat(Analysis/MeanInequalities): n-ary ℓ^p monotonicity and Lyapunov's inequality |
Add finite-sum versions of the two-term power inequalities in `Analysis/MeanInequalitiesPow.lean`, in `ℝ≥0`, `ℝ` and `ℝ≥0∞`:
* `sum_rpow_le_rpow_sum`: `∑ i ∈ s, f i ^ p ≤ (∑ i ∈ s, f i) ^ p` for `1 ≤ p`
* `rpow_sum_rpow_le`: the `ℓ^p` (quasi)norm `(∑ i ∈ s, f i ^ p) ^ (1 / p)` is antitone in `p > 0`
* `rpow_sum_le_sum_rpow`: `(∑ i ∈ s, f i) ^ p ≤ ∑ i ∈ s, f i ^ p` for `0 < p ≤ 1`
Also add Lyapunov's inequality in `Analysis/MeanInequalities.lean`, `NNReal.lyapunov_inequality` and `Real.lyapunov_inequality_of_nonneg`: the weighted moments `t ↦ ∑ i ∈ s, w i * f i ^ t` are log-convex on `[0, ∞)`.
The code was refined with AI assistance (Claude). The code has been reviewed by the author.
Discussion on zulip: [ℓp norm monotonicity for finite sums](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/.E2.84.93p.20norm.20monotonicity.20for.20finite.20sums)
---
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|
t-analysis
LLM-generated
new-contributor
|
122/0 |
Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean |
2 |
3 |
['ZRTMRH', 'github-actions'] |
nobody |
5-11226 5 days ago |
5-14343 5 days ago |
5-14336 5 days |
0 |
| 41861 |
stalex444 author:stalex444 |
feat(Algebra/Order/Floor): floor-of-sum dichotomy via fractional parts |
This PR adds four lemmas in Mathlib/Algebra/Order/Floor/Ring.lean, placed in the fractional-part section, complementing the existing one-sided bounds le_floor_add and le_floor_add_floor.
Here are the lemmas:
* floor_add_eq — writes ⌊a + b⌋ exactly as ⌊a⌋ + ⌊b⌋ + ⌊fract a + fract b⌋
* floor_add_eq_add_iff — the floors add exactly ⟺ the fractional parts sum below 1
* floor_add_eq_add_add_one_iff — the +1 case ⟺ the fractional parts sum to at least 1
* floor_add_eq_or — the dichotomy: it's always one or the other
The library has the two inequalities but not the exact case analysis, and this closes that small gap. In addition, these are the lemmas for the mechanical/Beatty-word development proposed here --https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Sturmian.20.28mechanical.29.20words/near/610836902.
Claude helped draft the Lean code; I reviewed the code, built the module locally, and it compiled.
---
I'm flexible on the lemma names should reviewers prefer different forms
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|
t-algebra
LLM-generated
new-contributor
maintainer-merge
label:t-algebra$ |
47/0 |
Mathlib/Algebra/Order/Floor/Ring.lean |
1 |
16 |
['BoltonBailey', 'github-actions', 'mathlib-merge-conflicts', 'stalex444', 'themathqueen'] |
nobody |
5-7904 5 days ago |
5-9678 5 days ago |
70-26119 70 days |
0 |
| 43885 |
plp127 author:plp127 |
refactor: reduce defeq abuse in `Representation.asModule` |
Reduce defeq abuse around `Representation.asModule` by adding explicitly uses of `Representation.asModuleEquiv` to convert between `V` and `ρ.asModule`. Also reorganize some `@[simp]` lemmas and fix some naming issues.
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t-algebra
tech debt
label:t-algebra$ |
70/89 |
Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Intertwining.lean,Mathlib/RepresentationTheory/Rep/Iso.lean,Mathlib/RepresentationTheory/Submodule.lean,Mathlib/RepresentationTheory/Subrepresentation.lean |
5 |
21 |
['JX-Mo', 'github-actions', 'plp127'] |
nobody |
5-6640 5 days ago |
26-27711 26 days ago |
30-23559 30 days |
0 |
| 38472 |
Raph-DG author:Raph-DG |
feat(AlgebraicGeometry): The Weil divisor associated to an element of the function field on a locally Noetherian integral scheme |
In this PR we define and provide some basic API for principal Weil divisors, i.e. the Weil divisor associated to an element of the function field of a locally noetherian, integral scheme.
- [x] depends on: #29774
- [x] depends on: #37985
- [x] depends on: #37901
- [x] depends on: #38002
- [x] depends on: #41317
---
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t-algebraic-geometry |
209/2 |
Mathlib.lean,Mathlib/AlgebraicGeometry/AlgebraicCycle/Basic.lean,Mathlib/AlgebraicGeometry/AlgebraicCycle/Principal.lean,Mathlib/AlgebraicGeometry/Noetherian.lean,Mathlib/AlgebraicGeometry/OrderOfVanishing.lean,Mathlib/AlgebraicGeometry/Restrict.lean,Mathlib/Topology/LocallyFinsupp.lean |
7 |
13 |
['Brian-Nugent', 'Raph-DG', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
joelriou assignee:joelriou |
5-6103 5 days ago |
18-58419 18 days ago |
40-65556 40 days |
1 |
| 41957 |
YijunYuan author:YijunYuan |
feat(NumberTheory/Padics/Complex): add densely normed field and separable space instances |
Equip the field `ℂ_[p]` of `p`-adic complex numbers and its dense subfield
`PadicAlgCl p` (the algebraic closure of `ℚ_[p]`) with two further standard
typeclass instances.
Main additions:
* `DenselyNormedField (PadicAlgCl p)`: the norm takes values dense in the
positive reals. The witness between two given bounds `a < b` is built from an
`n`-th root `z` of `p` (which exists since `PadicAlgCl p` is algebraically
closed): choosing `n` so that `(a / b) ^ n < ‖p‖` gives `a / b < ‖z‖ < 1`, and
some integer power `z ^ m` then has norm strictly between `a` and `b`.
* `SeparableSpace (PadicAlgCl p)`: the elements algebraic over `ℚ` form a
countable dense subset. Density follows from continuity of roots — `α` is a
root of its minimal polynomial `f` over `ℚ_[p]`, and approximating the
coefficients of `f` by a polynomial `g` over the dense subfield `ℚ` yields a
root `β` of `g` (hence algebraic over `ℚ`) arbitrarily close to `α`.
* The corresponding instances `DenselyNormedField ℂ_[p]` and
`SeparableSpace ℂ_[p]` are then inferred, `ℂ_[p]` being the completion of
`PadicAlgCl p`.
Supporting general instance:
* `DenselyNormedField (UniformSpace.Completion A)` for a densely normed field
`A` with `CompletableTopField A`, since the norm on the completion extends the
norm on `A`.
The existing `NontriviallyNormedField` instances on `PadicAlgCl p` and `ℂ_[p]`
are simplified to `inferInstance`, as they now follow from the new
`DenselyNormedField` instances. |
new-contributor
t-number-theory
t-algebra
label:t-algebra$ |
123/19 |
Mathlib/Analysis/Normed/Field/Dense.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/NumberTheory/Padics/Complex.lean |
3 |
11 |
['YijunYuan', 'github-actions', 'mathlib-merge-conflicts', 'pechersky', 'riccardobrasca'] |
alreadydone assignee:alreadydone |
5-6101 5 days ago |
16-54034 16 days ago |
81-9467 81 days |
0 |
| 43566 |
kim-em author:kim-em |
refactor(CategoryTheory): insert missing functor associators and unitors |
This PR inserts the functor associators and unitors that Mathlib currently omits, or applies in the wrong direction, when it identifies `(F ⋙ G) ⋙ H` with `F ⋙ G ⋙ H` or `𝟭 C ⋙ F` with `F` by unfolding `Functor.comp` and `Functor.id`. None of these changes are *necessary*, but all reduce some defeq abuse that hopefully will make life easier in future.
It is extracted from Paul Reichert's experiment making `Functor.comp` and `Functor.id` `instance_reducible` with a semireducible `map` field (https://github.com/leanprover-community/mathlib4/compare/master...leanprover-community:mathlib4-nightly-testing:datokrat/functorcomp, discussed at https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/backward.2EisDefEq.2ErespectTransparency), keeping only the bracketing and unit fixes so that future experiments of this kind have less to repair. The `Functor.comp_map` proof changes from that branch are not included, and the corresponding changes for (pre)sheaves of modules are in a separate PR.
The notable API changes are: `limit.pre_pre`, `post_post`, `pre_post` and their duals now relate the two bracketings through `HasLimit.isoOfNatIso (Functor.associator _ _ _)`; `StructuredArrow.final_map₂_id` takes `β : T ⋙ S ⟶ 𝟭 C ⋙ T'`; and `Join.mkNatTrans` and `mkNatIso` carry associators in their (autoparam) compatibility hypothesis.
🤖 Prepared with Claude Code |
tech debt |
254/128 |
Mathlib/AlgebraicGeometry/ColimitsOver.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/Subobject.lean,Mathlib/CategoryTheory/Comma/Final.lean,Mathlib/CategoryTheory/Comma/StructuredArrow/Basic.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Filtered/Final.lean,Mathlib/CategoryTheory/Functor/Derived/Adjunction.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Join/Basic.lean,Mathlib/CategoryTheory/Limits/Constructions/Over/Connected.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/FunctorCategory/Basic.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/IndYoneda.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Pullbacks.lean,Mathlib/CategoryTheory/Limits/Shapes/Opposites/Pullbacks.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Limits/Weighted/PreservesLimit.lean,Mathlib/CategoryTheory/Localization/Adjunction.lean,Mathlib/CategoryTheory/Monad/Limits.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/Monoidal/Multifunctor.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Shift/Induced.lean,Mathlib/CategoryTheory/Whiskering.lean |
25 |
15 |
['github-actions', 'kim-em', 'leanprover-radar', 'robin-carlier'] |
JovanGerb assignee:JovanGerb |
5-6099 5 days ago |
24-73176 24 days ago |
27-82135 27 days |
0 |
| 43815 |
SnirBroshi author:SnirBroshi |
feat(Data/Sym/Sym2): `Sym2.map` lifts equivalences |
`Sym2.map : (α → β) → (Sym2 α → Sym2 β)` preserves injectivity / surjectivity / bijectivity, and can lift `α ≃ β` to `Sym2 α ≃ Sym2 β`.
---
Is this what people might call "functoriality of `Sym2.map`"? Or maybe of `Sym2`? Or does `Sym2.map` itself already demonstrates that `Sym2` is functorial? Not sure
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|
t-data |
45/3 |
Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Data/Sym/Sym2.lean |
2 |
1 |
['github-actions'] |
TwoFX assignee:TwoFX |
5-6098 5 days ago |
32-5135 32 days ago |
32-7548 32 days |
1 |
| 43818 |
JovanGerb author:JovanGerb |
chore: clean up some `to_dual` debt |
This PR cleans up a bunch of uses of `to_dual existing`.
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[](https://gitpod.io/from-referrer/)
|
tech debt |
43/186 |
Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/IsLimit.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Basic.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Interval/Set/Disjoint.lean,Mathlib/Order/OrdContinuous.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/SuccPred/Archimedean.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/Order/WithBot.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Order/Bornology.lean,Mathlib/Topology/Order/OrderClosed.lean |
15 |
4 |
['JovanGerb', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
5-5639 5 days ago |
5-9438 5 days ago |
11-70822 11 days |
0 |
| 44786 |
ZRTMRH author:ZRTMRH |
feat(Lean/Quote): restore `Quote` instances for `Int` and `Rat` |
Add `Quote Int` and `Quote Rat` instances, analogous to core's `Quote Nat`.
They turn a number into numeral syntax without a type ascription (e.g. `quote (-7 / 2 : ℚ)` is `-7 / 2`), so the result elaborates at the expected type. These could later be upstreamed to Lean core.
These instances were added in #942 as part of `polyrith`, fixed in #24470, and removed together with the implementation of `polyrith` in #29547. This PR restores them unchanged (apart from naming) in their own file. Tests provided.
Motivated from the project of `maximize` / `minimize` tactics (PR to follow) which print a computed rational bound in a "Try this" suggestion such as `have : 4 * x + y ≤ 7 / 2 := by linarith`. Discussed on Zulip: [maximize / minimize tactic for linear optimization](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/maximize.20.2F.20minimize.20tactic.20for.20linear.20optimization).
The test file is refined with AI assistance (Claude) and has been reviewed by the author.
Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Co-authored-by: Aaron Liu <aaronliu2008@outlook.com>
---
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t-meta
LLM-generated
new-contributor
|
164/0 |
Mathlib.lean,Mathlib/Lean/Quote.lean,MathlibTest/Quote.lean |
3 |
3 |
['ZRTMRH', 'github-actions'] |
nobody |
5-2356 5 days ago |
5-2982 5 days ago |
5-2975 5 days |
0 |
| 44544 |
JovanGerb author:JovanGerb |
feat(Linter/Style): lint against `∀ᵉ`/`∃ᵉ` |
The `∀ᵉ`/`∃ᵉ` notation is used rarely in mathlib, so to many users it is an unfamiliar notation. Therefore, it would be better to simply not use it.
This PR adds a linter against the notation, which comes with a `Try this` suggestions that replaces the notation with uses of plain `∀`/`∃`
- The adaptations have been generated fully automatically using these `Try this` suggestions. So, it is easiest to review this PR commit by commit.
- The `∃ᵉ` notation is still used in one place, namely in the macro that defines the `{_ | _}` notation for sets. The linter explicitly does not flag this.
- This linter would fit in very nicely into the framework of #44496. That can be done in a follow-up PR after that is merged, and will remove the slowdown that this PR adds.
https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.E2.88.80.E1.B5.89.2F.E2.88.83.E1.B5.89.20notation/with/629610458
---
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|
t-linter
large-import
maintainer-merge
|
209/99 |
Mathlib/Algebra/Group/Irreducible/Indecomposable.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/Pointwise.lean,Mathlib/Algebra/Lie/Abelian.lean,Mathlib/Algebra/Lie/Basis/Basic.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Weights/Cartan.lean,Mathlib/Algebra/Lie/Weights/Chain.lean,Mathlib/Algebra/Module/Submodule/Union.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/Calculus/Deriv/MeanValue.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/ConstantSpeed.lean,Mathlib/Analysis/Convex/Extreme.lean,Mathlib/Analysis/Convex/Side.lean,Mathlib/Analysis/Convex/SimplicialComplex/Basic.lean,Mathlib/Combinatorics/Quiver/Path/Decomposition.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Computability/Partrec.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Sort.lean,Mathlib/Data/Set/Card.lean,Mathlib/Data/Set/Finite/Range.lean,Mathlib/Data/Set/Order.lean,Mathlib/Data/Set/Subsingleton.lean,Mathlib/FieldTheory/Minpoly/ConjRootClass.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Init.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/JordanChevalley.lean,Mathlib/LinearAlgebra/PerfectPairing/Restrict.lean,Mathlib/LinearAlgebra/RootSystem/BaseExists.lean,Mathlib/LinearAlgebra/RootSystem/Chain.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Nondegenerate.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Integral/FinMeasAdditive.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/MeasureTheory/SetAlgebra.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/DirectedInverseSystem.lean,Mathlib/Order/Filter/Interval.lean,Mathlib/Order/Hom/Set.lean,Mathlib/Order/Interval/Set/OrdConnectedLinear.lean,Mathlib/Order/Interval/Set/UnorderedInterval.lean,Mathlib/RingTheory/Algebraic/Basic.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/UniqueFactorizationDomain/Multiplicative.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean,Mathlib/RingTheory/WittVector/FrobeniusFractionField.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Topology/Algebra/Semigroup.lean,Mathlib/Topology/Algebra/UniformFilterBasis.lean,Mathlib/Topology/Algebra/ValuativeRel/ValuativeTopology.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean,Mathlib/Topology/VectorBundle/Basic.lean,MathlibTest/Linter/ExtendedBinder.lean |
62 |
11 |
['JovanGerb', 'eric-wieser', 'github-actions', 'joneugster', 'leanprover-radar', 'mathlib-merge-conflicts', 'vihdzp'] |
joneugster assignee:joneugster |
5-1070 5 days ago |
7-43324 7 days ago |
10-40169 10 days |
0 |
| 44214 |
ZRTMRH author:ZRTMRH |
feat(Analysis/SpecialFunctions): taylor series bounds for sin and cos |
Adds `Mathlib/Analysis/SpecialFunctions/Trigonometric/SeriesBounds.lean` with three groups of results:
1. Remainder bounds on the unit disc at every order: `Complex.sin_series_bound`, `Complex.cos_series_bound` and their real forms. Ported from #29355, taken over with the author's agreement. This PR supersedes #29355, which can be closed when this lands.
2. `Real.sum_lt_sin_of_pos`, `Real.sin_lt_sum_of_pos`, `Real.sum_lt_cos_of_pos`, and `Real.cos_lt_sum_of_pos`: `sin x` and `cos x` lie between consecutive partial sums of their Taylor series. Yury posted on Zulip in October 2025 with a request that someone open a PR for it ([Upper and Lower Bounds of Cosine](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Upper.20and.20Lower.20Bounds.20of.20Cosine/near/546287708)), it had not been opened.
4. Six low-order corollaries, as completion to `one_sub_sq_div_two_lt_cos` and `sin_gt_sub_cube` which Mathlib already has: `cos_lt/le_one_sub_sq_div_two_add_pow_four`, `sin_lt/le_sub_cube_add_pow_five`, and `sub_cube_add_pow_five_lt/le_sin` for negative arguments.
The 6 low-order corollaries and the docstrings were written with AI assistance (Claude). The code has been reviewed by the author.
Co-authored-by: Geoffrey Irving <irving@naml.us>
Co-authored-by: Yury G. Kudryashov <urkud@urkud.name>
---
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|
LLM-generated
new-contributor
t-analysis
|
302/0 |
Mathlib.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/SeriesBounds.lean |
3 |
53 |
['SnirBroshi', 'ZRTMRH', 'github-actions', 'wwylele'] |
nobody |
4-85486 4 days ago |
5-1743 5 days ago |
15-15070 15 days |
0 |
| 43911 |
kim-em author:kim-em |
ci: audit dependency diffs on the update-dependencies PR |
This PR adds a supply-chain audit step to the hourly `update_dependencies.yml` workflow. After `lake update`, it prepares the full `git diff` of every dependency whose revision changed (comparing `lake-manifest.json` against `master`), plus the `mathlib-ci` pin that the same PR bumps, uploads them as a workflow artifact, and once the PR exists comments on it with a summary table: links to each upstream commit and to GitHub's `old...new` compare view, high-risk files touched, suspicious added lines, and non-fast-forward warnings. The comment also carries the audit prompt, so anyone can run their preferred model over the same material and report back.
The diffs are produced by [paranoid-lake-update](https://github.com/kim-em/paranoid-lake-update), pinned by commit. It uses bare clones and `git` only: nothing from upstream is executed by this step (unlike `lake update` itself, which runs each dependency's `lakefile.lean` at configuration time). No new secrets or permissions are needed; the comment is posted with the existing app token.
If the community would rather host the tool under `leanprover-community`, the clone URL and pin are the only two lines to change.
🤖 Prepared with Claude Code
🤖 Generated with [Claude Code](https://claude.com/claude-code)
https://claude.ai/code/session_01X6RJUXkdBUChpnBeuojWAN
|
CI
LLM-generated
|
44/0 |
.github/workflows/update_dependencies.yml |
1 |
3 |
['github-actions', 'joneugster', 'kim-em'] |
bryangingechen assignee:bryangingechen |
4-82600 4 days ago |
28-80306 28 days ago |
28-80299 28 days |
0 |
| 44696 |
Hagb author:Hagb |
feat(Logic/Relation,Order/WellFounded): lemmas about `Acc`, `WellFounded`, and `Relation.Map` |
- `Acc (Relation.Map r f f) (f a)` and `WellFounded (Relation.Map r f f)` imply `Acc r a` and `WellFounded r` respectively;
- They are equivalent respectively if `f` is injective.
Suggested by @plp127 in https://github.com/leanprover-community/mathlib4/pull/39774#discussion_r3618397529
---
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|
t-order |
17/0 |
Mathlib/Logic/Relation.lean,Mathlib/Order/WellFounded.lean |
2 |
19 |
['Hagb', 'SnirBroshi', 'github-actions', 'plp127'] |
nobody |
4-80255 4 days ago |
6-56484 6 days ago |
6-56477 6 days |
0 |
| 44712 |
plp127 author:plp127 |
chore: rename arguments to `Shrink.rec` |
Name the motive `motive` and name the minor premises according to their contents. While we're here, also unexpose `Shrink.rec`, which is the last exposed declaration in this file, so also remove the `@[expose]` from the `@[expose] public section` at the top of the file because none of the declarations are actually exposed.
Also add a docstring.
---
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|
tech debt
t-logic
|
10/10 |
Mathlib/Logic/Small/Defs.lean,scripts/nolints.json |
2 |
2 |
['github-actions', 'vihdzp'] |
nobody |
4-74590 4 days ago |
6-15147 6 days ago |
6-15140 6 days |
0 |
| 44684 |
josephqian507 author:josephqian507 |
feat(LinearAlgebra/Matrix): add row equivalence and echelon form lemmas |
feat(LinearAlgebra/Matrix): add row equivalence and echelon form lemmas
This adds lemmas to bridge the current mathlib definition of row equivalence with the idea of two matrices that have the same null space. It also adds a proof that the reduced row echelon form of a matrix is unique. LLMs were used to fill in sorrys for some proofs (specifically, rowEquivalent_of_mul_eq_zero, rowEquivalent_iff_ker_eq, and much of RrefUniqueness.lean)
Co-authored-by: Junye Ji <junyej@uw.edu>
Co-authored-by: Dhruv Bhatia <dbhatia1@uw.edu>
---
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|
t-algebra
new-contributor
large-import
LLM-generated
label:t-algebra$ |
501/1 |
Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Echelon/Basic.lean,Mathlib/LinearAlgebra/Matrix/Echelon/RrefUniqueness.lean,Mathlib/LinearAlgebra/Matrix/ElementaryRowOperations.lean |
4 |
3 |
['github-actions', 'josephqian507'] |
nobody |
4-71085 4 days ago |
4-71771 4 days ago |
5-84659 5 days |
0 |
| 37953 |
Thmoas-Guan author:Thmoas-Guan |
feat(RingTheory/Smooth): transcendental separable extension is formally smooth |
In this PR, we proved that transcendental separable extension is formally smooth via reduction to fg cases.
---
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- [ ] depends on: #37934
[](https://gitpod.io/from-referrer/)
|
t-ring-theory |
141/3 |
Mathlib/RingTheory/Smooth/Field.lean |
1 |
4 |
['Thmoas-Guan', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
4-70498 4 days ago |
5-45502 5 days ago |
40-23308 40 days |
2 |
| 44660 |
jessealama author:jessealama |
feat(Combinatorics/SimpleGraph/Hamiltonian): close a Hamiltonian path into a Hamiltonian cycle |
Add `SimpleGraph.Walk.isHamiltonianCycle_cons`: closing a path `p` from `b` to `a` with an edge `a ~ b` gives a Hamiltonian cycle if and only if `p` is a Hamiltonian path that does not already use that edge.
This is the Hamiltonian analogue of `Walk.cons_isCycle_iff`. It was originally extracted at @YaelDillies's suggestion during review of #36376, which no longer needs it.
|
t-combinatorics |
6/0 |
Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean |
1 |
7 |
['SnirBroshi', 'YaelDillies', 'github-actions', 'jessealama'] |
nobody |
4-67003 4 days ago |
7-54599 7 days ago |
7-55660 7 days |
0 |
| 43655 |
mariainesdff author:mariainesdff |
feat(RingTheory/Valuation/Discrete/IsDiscreteValuationSubring): equivalent discrete valuations |
If `v` is equivalent to a discrete valuation, then `v` is discrete.
In particular, if a `ValuationSubring F` `A` is a discrete valuation ring, then `A.valuation` is discrete.
Co-authored-by: @xgenereux
---
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory |
130/82 |
Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/RingTheory/Valuation/Discrete/IsDiscreteValuationRing.lean,Mathlib/RingTheory/Valuation/Extension.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean |
6 |
22 |
['github-actions', 'jjdishere', 'mariainesdff'] |
nobody |
4-62588 4 days ago |
4-62588 4 days ago |
22-79932 22 days |
3 |
| 43591 |
mariainesdff author:mariainesdff |
feat(RingTheory/Valuation/ValuationSubring): algebraic instances |
Given a valuation subring `A`, if `A.valuation` is trivial on `k`, `A` is a `k`-algebra.
Co-authored-by: @xgenereux
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory |
24/0 |
Mathlib/RingTheory/Valuation/ValuationSubring.lean |
1 |
5 |
['github-actions', 'jjdishere', 'mariainesdff'] |
nobody |
4-55147 4 days ago |
4-55147 4 days ago |
22-22038 22 days |
0 |
| 36744 |
farmanb author:farmanb |
feat(CategoryTheory/Abelian/TorsionTheory): Introduce torsion theory for abelian categories |
Introduces torsion theories on an abelian category: a pair of object properties `T` and `F`
that are each other's left and right orthogonals. Adds `Abelian.TorsionTheory`, the
typeclasses `IsTorsionClass` / `IsTorsionFreeClass` (on the model of `Functor.IsLeftAdjoint`,
so closure properties come by instance search), the torsion theories generated and
cogenerated by a property, transport along `op`/`unop`, and Dickson's theorem
`isTorsionClass_iff`: in a well-powered abelian category with coproducts, a class is a
torsion class iff it is closed under quotients, extensions and coproducts. The torsion-free
version follows by passing to `Cᵒᵖ`.
---
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- [ ] depends on: #44226 |
t-category-theory |
295/0 |
Mathlib.lean,Mathlib/CategoryTheory/Abelian/TorsionTheory/Basic.lean |
2 |
40 |
['farmanb', 'github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'plp127'] |
robin-carlier assignee:robin-carlier |
4-54343 4 days ago |
4-54343 4 days ago |
6-58193 6 days |
0 |
| 44734 |
mycaule author:mycaule |
feat(RingTheory/LocalProperties/Semilocal): semilocal rings have stable range one |
Add `IsCoprime.exists_isUnit_add_mul` to `Mathlib/RingTheory/LocalProperties/Semilocal.lean`: in a commutative ring `R` with finitely many maximal ideals (`[Finite (MaximalSpectrum R)]`), if `a` and `b` are coprime, then `a + t * b` is a unit for some `t ∈ R`. In other words, a semilocal ring has stable range one (Bass, *K-theory and stable algebra*, 1964). The proof applies the Chinese remainder theorem (`Ideal.exists_forall_sub_mem_ideal`) to the maximal ideals: `t ≡ 0` modulo those containing `b`, and `t ≡ b⁻¹ (1 - a)` modulo the others. `docs/references.bib` gains Bass (1964).
Questions for reviewers: whether this belongs in `LocalProperties/Semilocal.lean` (which is about local properties) or next to the Chinese remainder theorem in `RingTheory/Ideal/Quotient/Operations.lean`; whether a `StableRange` definition would be wanted, with this as its first instance.
AI disclosure: the Lean proof was written by an AI model (Claude, Anthropic) under my direction. I have read and checked it and will handle the review. It builds against current master.
|
t-ring-theory
new-contributor
LLM-generated
|
42/0 |
Mathlib/RingTheory/LocalProperties/Semilocal.lean,docs/references.bib |
2 |
5 |
['github-actions', 'mycaule', 'vlad902'] |
nobody |
4-51363 4 days ago |
5-72580 5 days ago |
5-72573 5 days |
0 |
| 44741 |
mortarsanjaya author:mortarsanjaya |
feat: weaken even more assumptions on theorems about `FloorRing` |
This PR is mostly about weakening the assumptions of type `IsOrderedRing` or `IsStrictOrderedRing` to `IsOrderedAddMonoid` on theorems about `FloorSemiring` and `FloorRing`. However, none of these assumptions are completely removed.
---
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~~Unfortunately, the new proof of `floor_div_natCast`, done for the sake of reducing `IsStrictOrderedRing K` to `IsOrderedAddMonoid K`, is quite complicated and can definitely be refactored. If we use the old proof, `IsStrictOrderedRing K` can be reduced to `IsOrderedAddMonoid K` + `AddLeftStrictMono K`, but `AddLeftStrictMono K` cannot be removed. I will need help with this proof. If nothing else works, the lemma can also be reverted into the previous form with `IsOrderedAddMonoid K` + `AddLeftStrictMono K`.~~
~~The lemma `floor_div_natCast` affects `floor_div_eq_div`, `IsNNRat.natFloor`, and the `norm_num` extension `evalNatFloor`.~~
(The above has been resolved at the cost of one extra import.)
Other than this problem, should I give a documentation of when to use `IsOrderedAddMonoid`, `IsOrderedRing`, etc. or avoid them altogether in lemmas about `FloorRing`s? |
t-algebra label:t-algebra$ |
87/100 |
Mathlib/Algebra/Order/Floor/BigOperators.lean,Mathlib/Algebra/Order/Floor/Defs.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semifield.lean,Mathlib/Algebra/Order/Round.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Periodic.lean |
6 |
6 |
['chenson2018', 'github-actions', 'mortarsanjaya'] |
nobody |
4-51207 4 days ago |
4-73158 4 days ago |
4-73299 4 days |
0 |
| 43042 |
grunweg author:grunweg |
feat: `ContMDiff.clm_bundle_of_apply` and friends |
Future PRs will add versions of these allowing for the loss of derivatives:
let's start with these versions as the required modifications are straight-forward.
We add the analogous lemmas for differentiability also (and comment when this requires further work out of this PR's scope).
From the path towards smoothness of the Levi-Civita connection and Riemannian geometry.
Co-authored-by: Patrick Massot <patrickmassot@free.fr>
---
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|
t-differential-geometry |
137/2 |
Mathlib/Geometry/Manifold/VectorBundle/Hom.lean |
1 |
4 |
['github-actions', 'grunweg', 'mathlib-merge-conflicts'] |
nobody |
4-48616 4 days ago |
7-19076 7 days ago |
55-12728 55 days |
1 |
| 44765 |
JovanGerb author:JovanGerb |
chore(Linter/Multigoal): remove some exclusions |
The multi goal linter has a list of excluded tactics, but it excludes too many tactics. This PR fixes this, and adapts mathlib to the stronger linter.
I also made it so that the linter excludes all atomic syntax, like `;` and `<;>`, so these now don't need to be excluded explicitly anymore.
---
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|
t-linter |
123/158 |
Mathlib/Algebra/Category/ModuleCat/Subobject.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/CategoryTheory/Limits/Cones.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Kernels.lean,Mathlib/CategoryTheory/MorphismProperty/Descent.lean,Mathlib/Combinatorics/SetFamily/Shatter.lean,Mathlib/Data/Int/Lemmas.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/Data/Nat/GCD/Basic.lean,Mathlib/Data/Vector/Basic.lean,Mathlib/FieldTheory/Finite/GaloisField.lean,Mathlib/FieldTheory/PurelyInseparable/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Decomposition/Hahn.lean,Mathlib/Order/Filter/ENNReal.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/Tactic/Linter/Multigoal.lean,MathlibTest/Linter/Multigoal.lean |
17 |
6 |
['JovanGerb', 'github-actions', 'grunweg', 'mathlib-splicebot'] |
nobody |
4-47341 4 days ago |
5-9735 5 days ago |
5-16984 5 days |
0 |
| 44769 |
mycaule author:mycaule |
feat: volume of solids of revolution and of cones |
A new file `Mathlib/MeasureTheory/Measure/Lebesgue/SolidOfRevolution.lean` with the disc method for volumes of solids of revolution, in `ℝ × EuclideanSpace ℝ (Fin 2)`:
* `MeasureTheory.Measure.prod_setOf_mem_closedBall`: Cavalieri's principle for regions whose slices are closed balls, for any product `μ.prod ν` (`ν` s-finite, `E` a pseudometric space with `OpensMeasurableSpace`):
`μ.prod ν {p | p.1 ∈ s ∧ p.2 ∈ closedBall c (r p.1)} = ∫⁻ x in s, ν (closedBall c (r x)) ∂μ`.
* `EuclideanSpace.volume_setOf_mem_norm_le`: `volume {p : ℝ × ℝ² | p.1 ∈ s ∧ ‖p.2‖ ≤ r p.1} = ∫⁻ x in s, ENNReal.ofReal (r x) ^ 2 * ENNReal.ofReal π` (no sign condition on `r` is needed).
* `EuclideanSpace.volume_solidOfRevolution`: if `f` is continuous and nonnegative on `[a, b]`, then the solid of revolution has volume `ENNReal.ofReal (π * ∫ x in a..b, f x ^ 2)`.
* `EuclideanGeometry.euclideanHausdorffMeasure_cone` (in `Mathlib/Geometry/Euclidean/Volume/MeasureSimplex.lean`, right before the simplex formula it generalizes; suggested in review): in an affine subspace `T` of dimension `d + 1`, the cone with apex `a ∈ T` over a measurable base `B` contained in an affine subspace `S ≤ T` with `a ∉ S` has volume `μHE[d + 1] = h * μHE[d] B / (d + 1)`, with `h = dist a (orthogonalProjection S a)`. Proved by slicing with `euclideanHausdorffMeasure_eq_lintegral_of_subset` (slices are `homothety a x '' B`).
* The simplex formula `Affine.Simplex.euclideanHausdorffMeasure_closedInterior` is the special case of a cone over a face; its proof is left unchanged here, and could be derived from the cone theorem in a follow-up.
* `EuclideanSpace.volume_cone`: the cone of radius `R` and height `H` has volume `π * R ^ 2 * H / 3`.
The proofs use `Measure.prod_apply` (slices are balls) and `EuclideanSpace.volume_closedBall_fin_two`.
Happy to change the ambient space (e.g. `EuclideanSpace ℝ (Fin 3)` with rotation around a coordinate axis) or the file location if reviewers prefer.
AI disclosure: the statements and proofs were drafted with Claude (Claude Code) and checked by compiling against Mathlib; I have reviewed them.
---
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
t-measure-probability
LLM-generated
new-contributor
|
237/10 |
Mathlib.lean,Mathlib/Geometry/Euclidean/Volume/MeasureSimplex.lean,Mathlib/MeasureTheory/Measure/Lebesgue/SolidOfRevolution.lean |
3 |
8 |
['github-actions', 'mycaule', 'vihdzp', 'wwylele'] |
nobody |
4-40597 4 days ago |
5-44075 5 days ago |
5-44068 5 days |
0 |
| 43980 |
joelriou author:joelriou |
feat(Algebra/Homology): the homology functor is accessible |
If `C` is a Grothendieck abelian category, we show that the homology functors (from the categories of short complexes or homological complexes in `C`) preserve filtered colimits.
---
There are a few new `set_option` in this PR, but I am fixing all the transparency issues in all the `Algebra/Homology/ShortComplex/` files in a followup PR #44011.
- [x] depends on: #43977
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[](https://gitpod.io/from-referrer/)
|
t-category-theory
increases-technical-debt
|
275/0 |
Mathlib.lean,Mathlib/Algebra/Homology/ShortComplex/HomologicalComplex.lean,Mathlib/Algebra/Homology/ShortComplex/Homology.lean,Mathlib/Algebra/Homology/ShortComplex/HomologyCofork.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/HomologyFunctorAccessible.lean |
5 |
3 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
4-21592 4 days ago |
4-22263 4 days ago |
4-22257 4 days |
1 |
| 44784 |
shunfeng8421 author:shunfeng8421 |
feat(Combinatorics): prove finitary Van der Waerden by compactness |
Proves the finitary version of Van der Waerden's theorem:
```lean
theorem van_der_waerden (k : ℕ) {κ : Type*} [Finite κ] [Nonempty κ] :
∃ N : ℕ, ∀ C : Fin (N + 1) → κ, HasMonoAPWithin k N C
```
i.e. every finite coloring of a sufficiently large initial segment `[0, N]`
contains a monochromatic arithmetic progression of length `k`.
This resolves the TODO in `Mathlib/Combinatorics/HalesJewett.lean` asking for a
finitary version of Van der Waerden's theorem.
## Proof sketch
The proof goes by compactness (Rado's selection lemma), the route explicitly
suggested in the TODO ("either by compactness or by modifying the current
proof"):
1. Assume the theorem fails: every segment `[0, N]` admits a "bad" coloring with
no monochromatic AP of length `k`.
2. For each finite set `s ⊆ ℕ`, pick the bad coloring of the covering interval
`[0, s.sup id]` and extend it (arbitrarily) to all of `ℕ`.
3. **Rado's selection lemma** (`Finset.rado_selection`, from
`Mathlib/Combinatorics/Compactness.lean`, itself proved via Tychonoff's
theorem) stitches these local bad colorings into a global coloring
`χ : ℕ → κ` that agrees with some local bad coloring on every finite set.
4. The **infinite** Van der Waerden theorem — `Combinatorics.exists_mono_homothetic_copy`,
a corollary of Hales–Jewett — produces a monochromatic AP `(a * t + b)_{t < k}`
in `χ`.
5. Viewed as a finite set, this AP lies inside the covering interval of some
finite set `t` on which the bad coloring agrees with `χ`, so it is also
monochromatic there — contradicting badness of that local coloring.
No explicit bounds are produced; this is purely an existence proof, which is
exactly what the compactness route buys.
## New definitions
- `Combinatorics.HasMonoAPWithin k N C`: the coloring `C : Fin (N+1) → κ` of the
initial segment `[0, N]` contains a monochromatic AP of length `k`.
## Changes
- `Mathlib/Combinatorics/HalesJewett.lean`: removed the completed TODO item
("Prove a finitary version of Van der Waerden's theorem ... by compactness"),
added a pointer to the new theorem in the "Main results" list.
- `Mathlib/Combinatorics/VanDerWaerden.lean`: new file.
## Notes for the reviewer
- The file header still contains the `[Author]` placeholder: fill in your name
before committing.
-------
**AI disclosure**: AI-assisted tools were used to draft the proof outline and Lean code, and to debug type/simplifier issues; all contributions were reviewed and verified by the author, who takes full responsibility for the correctness of the mathematics and code.
|
t-combinatorics
new-contributor
LLM-generated
|
100/3 |
Mathlib.lean,Mathlib/Combinatorics/HalesJewett.lean,Mathlib/Combinatorics/VanDerWaerden.lean |
3 |
5 |
['github-actions', 'grunweg', 'shunfeng8421'] |
nobody |
4-15588 4 days ago |
4-15588 4 days ago |
4-23937 4 days |
0 |
| 42353 |
sankalpsthakur author:sankalpsthakur |
feat(RingTheory): add nilpotence lemmas for zero sums |
In a commutative semiring, adds:
- `sq_eq_sq_of_add_eq_zero`: if `x + y = 0` then `x^2 = y^2`
- `IsNilpotent.of_add_eq_zero_left`: if `x + y = 0` and `y` is nilpotent, so is `x`
- `isNilpotent_iff_of_add_eq_zero`: under `x + y = 0`, `x` is nilpotent iff `y` is
Motivated by #10539.
### Validation
Built locally: `lake build Mathlib.RingTheory.Nilpotent.Basic` — succeeds.
Closes #10539
### AI/LLM disclosure
AI coding tools were used to help draft this change and PR description. I reviewed the complete change, understand the reasoning, and verified the build locally before submitting. |
t-ring-theory
new-contributor
LLM-generated
|
49/0 |
Mathlib/RingTheory/Nilpotent/Basic.lean |
1 |
29 |
['github-actions', 'sankalpsthakur', 'tb65536'] |
nobody |
4-12002 4 days ago |
51-69586 51 days ago |
57-77367 57 days |
0 |
| 43692 |
j-loreaux author:j-loreaux |
feat: a syntax linter for the `@[congr]` attribute |
The documentation for the `@[congr]` attribute states:
```
A `simp` congruence lemma should prove the equality of two applications of the same function from
the equality of the individual arguments. They are used by `simp` to visit subexpressions of an
application where the default congruence algorithm fails. This is particularly important for
functions where some parameters depend on previous parameters.
Congruence lemmas should have an equality for every parameter, possibly bounded by foralls, with
the right hand side being an application of a parameter on the right-hand side. When applying
congruence theorems, `simp` will first infer parameters from the right-hand side, then try to
simplify each left-hand side of the parameter equalities and finally infer the right-hand side
parameters from the result.
```
However, no check is performed to verify that all the arguments to the function vary. This PR adds a syntax linter to check this and turns it on by default across Mathlib. We explicitly silence the linter where it currently triggers.
This linter addresses a real problem, as I was bitten by the lack of this check in #43028 and fixed in #43689.
---
AI disclosure: this was generated by Claude (Opus 5) with my prompting. I rewrote some bits here and there to something I found more suitable, especially in the documentation portions. I understand all the meta code written herein, but I'm not sure if it follows best practices everywhere or not.
After some initial review, I had some better ideas of what could be changed, and made edits myself, without Claude.
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|
t-linter
LLM-generated
large-import
|
244/0 |
Mathlib.lean,Mathlib/Data/Finset/Filter.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Find.lean,Mathlib/Data/List/Zip.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Filter.lean,Mathlib/Data/Multiset/Find.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/NAry.lean,Mathlib/Data/Sym/Basic.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/Geometry/Convex/ConvexSpace/Defs.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/CongrFixedArgs.lean,MathlibTest/Linter/CongrFixedArgs.lean |
19 |
27 |
['JovanGerb', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts'] |
nobody |
4-10006 4 days ago |
4-24937 4 days ago |
32-84378 32 days |
0 |
| 40472 |
karlesmarin author:karlesmarin |
feat(Combinatorics/SimpleGraph): oriented incidence matrix |
Defines the oriented incidence matrix `SimpleGraph.orientedIncMatrix` of a simple graph on a linearly ordered vertex type, with each edge oriented from its smaller to its larger endpoint, and proves `orientedIncMatrix_mul_transpose : N * Nᵀ = G.lapMatrix R`.
This covers, for a fixed orientation, the second TODO in `Mathlib/Combinatorics/SimpleGraph/IncMatrix.lean`.
Written with the help of an LLM (Claude).
|
new-contributor
LLM-generated
t-combinatorics
|
157/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/OrientedIncMatrix.lean |
2 |
21 |
['SnirBroshi', 'github-actions', 'karlesmarin'] |
b-mehta assignee:b-mehta |
4-6103 4 days ago |
19-27120 19 days ago |
126-54446 126 days |
0 |
| 44276 |
justus-springer author:justus-springer |
doc(AlgebraicGeometry/AffineTransitionLimit): improve stacks tags |
---
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|
t-algebraic-geometry |
5/4 |
Mathlib/AlgebraicGeometry/AffineTransitionLimit.lean |
1 |
1 |
['github-actions'] |
riccardobrasca assignee:riccardobrasca |
4-6101 4 days ago |
18-59082 18 days ago |
18-59075 18 days |
0 |
| 39067 |
mbkybky author:mbkybky |
feat(Algebra/Module): define modules admitting finite free resolutions |
We say that an `R`-module `M` has a finite free resolution if there exists an exact sequence `0 ⟶ Eₙ ⟶ ⋯ ⟶ E₀ ⟶ M ⟶ 0` such that `Eᵢ` are finite free `R`-modules.
- [x] depends on: #41880
---
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|
t-algebra label:t-algebra$ |
171/0 |
Mathlib.lean,Mathlib/Algebra/Module/FiniteFreeResolution/Basic.lean |
2 |
4 |
['github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
4-5200 4 days ago |
25-51741 25 days ago |
65-3872 65 days |
2 |
| 41399 |
vlad902 author:vlad902 |
feat(MvPolynomial): ideal generated by indeterminates in a polynomial ring over a domain is prime |
---
AI: Used Claude to help search for lemmas and golf, no AI code made it into the final PR.
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory |
46/7 |
Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/RingTheory/AdicCompletion/Completeness.lean,Mathlib/RingTheory/MvPolynomial/Ideal.lean |
3 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
4-5199 4 days ago |
41-46047 41 days ago |
101-7641 101 days |
1 |
| 43013 |
grunweg author:grunweg |
feat: diffeomorphisms are smooth embeddings |
This is a direct corollary of a previous PR, so let's include it.
This PR assumes matching models with corners (as the general case is not obviously true).
Using the inverse function theorem instead allows any models, but requires Banach manifolds and conditions on boundary behaviour. This will be added in the future, once the relevant version of the inverse function theorem is merged to mathlib.
---
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[](https://gitpod.io/from-referrer/)
|
t-differential-geometry |
32/3 |
Mathlib/Geometry/Manifold/Immersion.lean,Mathlib/Geometry/Manifold/SmoothEmbedding.lean |
2 |
3 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
4-5199 4 days ago |
27-22287 27 days ago |
28-31122 28 days |
0 |
| 44812 |
keithadler author:keithadler |
fix(MeasureTheory/Group/Arithmetic): make `Finset.measurable_prod` state the product of functions |
`Finset.measurable_prod` (and `Finset.measurable_sum`) had exactly the same statement and proof as `Finset.measurable_fun_prod`: `Measurable fun a ↦ ∏ i ∈ s, f i a`. Everywhere else in this file the plain name states the point-free form (`List.measurable_prod : Measurable l.prod`, `Finset.aemeasurable_prod : AEMeasurable (∏ i ∈ s, f i) μ`) and `_fun_` states the `fun a ↦ …` form. This makes `Finset.measurable_prod` state `Measurable (∏ i ∈ s, f i)`, proved through `Multiset.measurable_prod` the way `aemeasurable_prod` is, and proves `measurable_fun_prod` from it. The two uses that need the `fun` form, `IsProgressive.finsetProd` and `integral_id_stdGaussian`, now use `measurable_fun_prod` / `measurable_fun_sum`.
The three edited modules build and `lake exe runLinter` passes on them, on current `master`. I did not build the rest of Mathlib, so CI will show whether anything else used the old statement.
Found with [Lean Studio](https://github.com/keithadler/leanstudio)'s Find Similar Proofs. Prepared with AI assistance (Claude); I checked the change and the build.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
t-measure-probability
LLM-generated
new-contributor
|
9/9 |
Mathlib/MeasureTheory/Group/Arithmetic.lean,Mathlib/Probability/Distributions/Gaussian/Multivariate.lean,Mathlib/Probability/Process/Adapted.lean |
3 |
3 |
['github-actions', 'keithadler'] |
nobody |
4-4716 4 days ago |
4-5962 4 days ago |
4-5955 4 days |
0 |
| 44813 |
wwylele author:wwylele |
feat(MeasureTheory/Integral): layer cake formula for ENNReal-valued function |
The LHS is now applicable to all lintegral and it allows dealing with infinity uniformly.
---
This is working towards Prékopa–Leindler inequality
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|
t-measure-probability |
22/0 |
Mathlib/MeasureTheory/Integral/Layercake.lean |
1 |
4 |
['copilot-pull-request-reviewer', 'github-actions', 'wwylele'] |
nobody |
4-4484 4 days ago |
4-5393 4 days ago |
4-5386 4 days |
1 |
| 44814 |
BryceT233 author:BryceT233 |
feat(Algebra/TotalMonoidAlgebra): definitions and basic coefficient API |
We added the definitions and basic coefficient API of total monoid algebra.
---
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This is a split of #41472 |
t-algebra label:t-algebra$ |
331/0 |
Mathlib.lean,Mathlib/Algebra/TotalMonoidAlgebra/Defs.lean |
2 |
1 |
['github-actions'] |
nobody |
4-3661 4 days ago |
4-4279 4 days ago |
4-4272 4 days |
1 |
| 42067 |
themathqueen author:themathqueen |
feat(RingTheory): define Frobenius algebras |
A `FrobeniusAlgebra` is an algebra that is equipped with a `dual : Module.Dual R A` such that the bilinear form `(LinearMap.mul R A).compr₂ dual` is bijective.
A straightforward example: a matrix over a field with the trace as its dual is a Frobenius algebra. (Not an instance because there can be other choices of the dual.)
A `FrobeniusAlgebra` induces a coalgebra such that it satisfies the Frobenius equations (`Coalgebra.IsFrobenius`).
Note that this is not an instance since you can have a different coalgebra that is not equal to this one (for example, if you have a `Bialgebra R A` where `A` is not isomorphic to `R` then the coalgebra cannot satisfy the Frobenius equations, so this is not equal to the coalgebra coming from a `FrobeniusAlgebra R A`).
A coalgebra that satisfies the Frobenius equations (`Coalgebra.IsFrobenius`) naturally induces a Frobenius algebra (`FrobeniusAlgebra`).
---
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[](https://gitpod.io/from-referrer/)
|
t-ring-theory |
331/21 |
Mathlib.lean,Mathlib/RingTheory/Coalgebra/IsFrobenius.lean,Mathlib/RingTheory/FrobeniusAlgebra/Basic.lean,Mathlib/RingTheory/FrobeniusAlgebra/IsFrobenius.lean |
4 |
12 |
['JX-Mo', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'themathqueen'] |
nobody |
3-79872 3 days ago |
25-46528 25 days ago |
25-46682 25 days |
0 |
| 44622 |
grunweg author:grunweg |
chore(MathlibTest/Linter/DupNamespace): use the module system |
Because this is a good practice in general.
---
- [x] depends on: #44621
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|
easy
maintainer-merge
|
7/2 |
MathlibTest/Linter/DupNamespace.lean |
1 |
11 |
['JovanGerb', 'SnirBroshi', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-dependent-issues'] |
nobody |
3-74975 3 days ago |
8-35602 8 days ago |
8-35655 8 days |
0 |
| 44147 |
eric-wieser author:eric-wieser |
feat(Data/List/Sort): lemmas about sublists and orderedInsert |
Add `List.orderedInsert_eq_cons_of_forall_rel`, and characterize when one `orderedInsert` is a sublist of another (`List.orderedInsert_sublist_orderedInsert_iff`, `List.orderedInsert_sublist_orderedInsert_iff_of_notMem`, `List.erase_sublist_iff_sublist_orderedInsert_of_notMem`), a permutation of another (`List.orderedInsert_perm_orderedInsert_iff`, `List.orderedInsert_perm_orderedInsert_iff_right`), or a sub-permutation of another (`List.orderedInsert_subperm_orderedInsert_iff`).
Also add `List.perm_cons_right_iff : a :: l ~ b :: l ↔ a = b`, the `cons` version of `List.perm_append_right_iff`.
These are split out from work on a basis for `CliffordAlgebra`.
---
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|
t-data
LLM-generated
|
48/9 |
Mathlib/Data/List/Perm/Basic.lean,Mathlib/Data/List/Sort.lean |
2 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
3-74842 3 days ago |
6-80634 6 days ago |
11-34071 11 days |
0 |
| 42878 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/Star): the nth star graph is contained in a graph iff max degree is at least `n` |
- `starGraph (r : W) ⊑ G ↔ Nat.card W ≤ G.maxDegree + 1`
- `starGraph v ⊑ starGraph w ↔ Nonempty (V ↪ W)`
- `starGraph v ⊴ starGraph w ↔ Nonempty (V ↪ W)`
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics |
86/1 |
Mathlib/Combinatorics/SimpleGraph/Star.lean |
1 |
7 |
['SnirBroshi', 'b-mehta', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
3-73975 3 days ago |
3-74524 3 days ago |
48-61786 48 days |
0 |
| 42665 |
SnirBroshi author:SnirBroshi |
chore(SimpleGraph/Coloring/Constructions): some golfs |
Also remove the `2 ≤ n` hypothesis from `cycleGraph.tricoloring`, and spell `two_colorable_iff_forall_loop_even` using `IsBipartite`.
---
- `cycleGraph.tricoloring`: 165ms to 110ms
- `chromaticNumber_cycleGraph_of_odd`: 25ms to 55ms
- `two_colorable_iff_forall_loop_even`: 50ms to 40ms
- `IsTree.coloringTwoOfVert`: 45ms to 75ms
- `IsAcyclic.coloringTwoOfVerts`: 50ms to 50ms
The issues in `tricoloring` kinda remind me of #41338; maybe there's a good lemma that'll help them both, not sure.
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|
t-combinatorics |
38/65 |
Mathlib/Algebra/Ring/Parity.lean,Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Constructions.lean |
3 |
8 |
['SnirBroshi', 'b-mehta', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
3-72080 3 days ago |
3-74258 3 days ago |
65-81960 65 days |
0 |
| 43965 |
YaelDillies author:YaelDillies |
feat(NumberTheory): `decide`, `#eval` and `norm_num` for Carmichael numbers |
Provide both an efficient decidability instance and a `norm_num` extension to decide whether a given literal is a Carmichael number.
This lets us prove that 561 is the smallest Carmichael number "in a computationally efficient manner". Deprecate the version of Korselt's criterion that was supposed to be used for this (but was less efficient than these new instance/extension).
Generated by Claude Opus in several rounds of review to optimise various parts of the algorithms and make sure that the decidability instance works for both `#eval` and `decide`. I haven't made much of an effort to clean the proofs (existing proofs internal to `norm_num` read like garbage to me anyway).
From FormalConjectures
Assisted-by: Claude Opus 5.1
---
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[](https://gitpod.io/from-referrer/)
|
t-number-theory
LLM-generated
t-meta
|
312/10 |
Mathlib/NumberTheory/CarmichaelNumber.lean,MathlibTest/NumberTheory/CarmichaelNumber.lean |
2 |
13 |
['Parcly-Taxel', 'SnirBroshi', 'YaelDillies', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'vihdzp', 'wwylele'] |
nobody |
3-71953 3 days ago |
3-72556 3 days ago |
23-74579 23 days |
1 |
| 44117 |
zblore author:zblore |
feat(Topology/Algebra): quotient topology on projective space and open quotient map |
This gives `ℙ K V` the quotient topology and shows `Projectivization.mk'` is an open quotient map when the units of `K` act continuously on `V`. It also adds the two instances the proof needs to `Topology/Algebra/MulAction.lean`. A `SubMulAction` inherits `ContinuousConstSMul`, and `Kˣ` acts continuously on the nonzero vectors.
This is the first step towards the Fubini-Study metric and measure on `ℂℙⁿ`. I discussed it on Zulip here https://leanprover.zulipchat.com/#narrow/id/617154981 and here https://leanprover.zulipchat.com/#narrow/id/625402419
I used Claude to draft the Lean against the existing Mathlib API. I've reworked and checked every line myself and can explain all of it.
---
|
t-topology
new-contributor
LLM-generated
|
116/0 |
Mathlib.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/Topology/Algebra/MulAction.lean,Mathlib/Topology/Algebra/Projectivization.lean |
4 |
7 |
['gasparattila', 'github-actions', 'zblore'] |
nobody |
3-66334 3 days ago |
23-55305 23 days ago |
23-55298 23 days |
0 |
| 43211 |
YaelDillies author:YaelDillies |
feat(Geometry/Convex): ordered convex spaces |
Define ordered convex spaces as those convex spaces for which taking convex combinations is monotone in its inputs. Since `sConvexComb : StdSimplex R X → X`, the best way to do so is to equip `StdSimplex R X` with the stochastic dominance order and requiring `sConvexComb` to be monotone under that order.
Also define two constructors to pull back a ConvexSpace instance under an injective map with convex range: a computable one further taking a section of the map as input, and a non-computable one. Redefine the `Subtype` instance and define the `OrderDual` instance using the computable one.
Generated by Claude Opus following my existing draft, then reviewed and partly rewritten by myself.
From the convexity refactor. Ordered convex spaces will be used to define convex/concave functions.
Assisted-by: Claude Opus 5
---
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|
t-convex-geometry
LLM-generated
|
458/10 |
Mathlib.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Geometry/Convex/ConvexSpace/Defs.lean,Mathlib/Geometry/Convex/ConvexSpace/Order.lean,Mathlib/Geometry/Convex/Set.lean,Mathlib/Order/UpperLower/Basic.lean |
7 |
17 |
['YaelDillies', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
3-64819 3 days ago |
3-69159 3 days ago |
42-64449 42 days |
0 |
| 38964 |
smmercuri author:smmercuri |
chore(Algebra): consolidate variables and sections for `AlgHom`/`AlgEquiv` |
This is a preparatory PR for the refactor of `AlgHom` to be semilinear (see #38376). This PR does not add or remove any results and only moves things around to reduce the diff for the future refactor. Namely, we do the following:
- Re-order variables in `AlgHom` and `AlgEquiv` so that `CommSemiring R` directly follows `R`. This is needed in the semialgebra definition.
- Move `comp` and `trans` API later in respective files so that the extra variables needed for those lemmas can be sectioned better.
- Similarly move some `congr` results in `Equiv.lean` to their own sections.
- Align variable names in `Equiv.lean` to match `Hom.lean`
---
- [x] depends on: #38950
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|
|
374/353 |
Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/Notation.lean,Mathlib/FieldTheory/Normal/Basic.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/Polynomial/Quotient.lean,Mathlib/RingTheory/Smooth/IntegralClosure.lean,MathlibTest/GalNotation.lean |
11 |
21 |
['Multramate', 'SnirBroshi', 'github-actions', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'smmercuri'] |
nobody |
3-57073 3 days ago |
3-60452 3 days ago |
36-75156 36 days |
1 |
| 26215 |
Thmoas-Guan author:Thmoas-Guan |
feat(Algebra): Auslander–Buchsbaum theorem |
This PR mainly proved the Auslander-Buchsbaum theorem stating for a noetherian local ring `R` and a finitely generated `R` module `M` , `proj.dim(M) + depth(M) = depth(R)`.
Co-authored-by: Yongle Hu <mbkybky@gmail.com>
---
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[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
371/0 |
Mathlib.lean,Mathlib/RingTheory/Depth/AuslanderBuchsbaum.lean |
2 |
14 |
['Thmoas-Guan', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot'] |
nobody |
3-55067 3 days ago |
13-8001 13 days ago |
13-14364 13 days |
8 |
| 26216 |
Thmoas-Guan author:Thmoas-Guan |
feat(Algebra): depth of QuotSMulTop |
In this PR, we proved for a local ring `R` and a finitely generated `R` module `M N`, `IsSMulRegular M x` and `x ∈ Module.annihilator R N`, then `depth(N, M/xM) + 1 = depth(N, M)`, and its corollary for quotient regular seqence.
---
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|
t-algebra label:t-algebra$ |
260/0 |
Mathlib/RingTheory/Depth/Basic.lean |
1 |
12 |
['Thmoas-Guan', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot'] |
nobody |
3-55032 3 days ago |
13-7822 13 days ago |
13-14145 13 days |
16 |
| 26217 |
Thmoas-Guan author:Thmoas-Guan |
feat(Algebra): Ischebeck theorem |
This PR mainly proved the Ischbecke theorem, stating that `depth(N,M)` is greater or equal to `depth(M) - dim(N)` for finitely generated module `N, M` over local ring.
---
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[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
208/0 |
Mathlib.lean,Mathlib/RingTheory/Depth/Ischebeck.lean |
2 |
14 |
['Thmoas-Guan', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot'] |
nobody |
3-54948 3 days ago |
13-7670 13 days ago |
13-13993 13 days |
17 |
| 28683 |
Thmoas-Guan author:Thmoas-Guan |
feat(RingTheory): regular local ring is domain |
In this PR, we proved for a regular local ring `R`,
1 : for a finite set `S` in the maximal Ideal of `R`, it can be extended to a regular system of parameters iff they are linear independent in the cotangent space iff `R/span S` is regular local ring of dimesion `dim R - |S|`
2 : is domain
3 : regular system of parameter form regular sequence.
---
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|
t-ring-theory |
253/0 |
Mathlib.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean |
2 |
59 |
['Raph-DG', 'Thmoas-Guan', 'WenrongZou', 'erdOne', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'mbkybky'] |
nobody |
3-51318 3 days ago |
10-70899 10 days ago |
23-62359 23 days |
11 |
| 29558 |
Thmoas-Guan author:Thmoas-Guan |
feat(Algebra): definition of global dimension |
In this PR, we define global dimension supremum over `projectiveDimension`
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t-ring-theory |
117/0 |
Mathlib.lean,Mathlib/RingTheory/GlobalDimension.lean |
2 |
23 |
['Thmoas-Guan', 'erdOne', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vlad902'] |
nobody |
3-50870 3 days ago |
44-65078 44 days ago |
73-4857 73 days |
8 |
| 42735 |
FrankieNC author:FrankieNC |
chore(Probability/ProbabilityMassFunction): remove defeq option in Monad |
Remove the `set_option backward.isDefEq.respectTransparency` false in `Mathlib/Probability/ProbabilityMassFunction/Monad.lean`, on `bindOnSupport_bindOnSupport`.
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tech debt
t-measure-probability
|
10/9 |
Mathlib/Probability/ProbabilityMassFunction/Monad.lean |
1 |
5 |
['FrankieNC', 'JovanGerb', 'github-actions'] |
JovanGerb assignee:JovanGerb |
3-49902 3 days ago |
4-22459 4 days ago |
59-59219 59 days |
0 |
| 43280 |
idontgetoutmuch author:idontgetoutmuch |
feat(Topology/VectorBundle): coordinate lemmas for the bundle of bilinear forms |
Two coordinate-level identities for the bundle of scalar-valued bilinear forms
`fun x ↦ E₁ x →L[𝕜] E₁ x →L[𝕜] 𝕜` over a vector bundle, added to
`Mathlib/Topology/VectorBundle/Hom.lean`:
- `inCoordinates_apply_eq₂_bilin`: specialisation of `inCoordinates_apply_eq₂` to
scalar-valued forms on a single bundle (`E₂ = E₁`, `E₃ = Bundle.Trivial B 𝕜`);
- `trivializationAt_symm_apply_bilin`: the inverse trivialization of the bilinear-forms
bundle, applied to fibre vectors, equals the model form on their images under
`continuousLinearMapAt`.
`Hom.lean` now imports `Mathlib.Topology.VectorBundle.Constructions`, which is needed
for the `Bundle.Trivial` instances used in these statements.
`inCoordinates_apply_eq₂_bilin` is used to simplify six proof steps in
`Mathlib/Topology/VectorBundle/Riemannian.lean`, which previously applied
`inCoordinates_apply_eq₂ h h (Set.mem_univ _)` and then simplified away the trivial-bundle
`linearMapAt` by hand. Two ad hoc `convert!` proofs there are replaced by the existing
`Trivialization.symm_linearMapAt`.
This is the first piece split out of #33714 (existence of a Riemannian metric on a
manifold), which will be rebased on top of this PR. |
t-topology
new-contributor
|
45/20 |
Mathlib/Topology/VectorBundle/Hom.lean,Mathlib/Topology/VectorBundle/Riemannian.lean |
2 |
21 |
['github-actions', 'grunweg', 'idontgetoutmuch'] |
grunweg assignee:grunweg |
3-41147 3 days ago |
23-38551 23 days ago |
45-52894 45 days |
0 |
| 44686 |
D-Thomine author:D-Thomine |
refactor(UniformIntegrable): change the definition of `UniformIntegrable` |
Change `UniformIntegrable` to a structure, and base the definition on a sup to avoid carrying an explicit bound.
PR extracted from https://github.com/leanprover-community/mathlib4/pull/42993, which I intend to cut in more manageable chunks.
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|
t-measure-probability |
128/158 |
Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/Probability/Kernel/Disintegration/Density.lean,Mathlib/Probability/Martingale/BorelCantelli.lean,Mathlib/Probability/Martingale/Convergence.lean,Mathlib/Probability/Process/LimitProcess.lean |
6 |
1 |
['github-actions'] |
nobody |
3-40597 3 days ago |
7-14183 7 days ago |
7-14176 7 days |
0 |
| 44546 |
grunweg author:grunweg |
chore: use differential geometry elaborators for `ContinuousAlternatingMap`s more |
---
- [x] depends on: #44371
- [x] depends on: #44549
- [x] depends on: #44561
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|
t-differential-geometry
t-meta
|
89/117 |
Mathlib/Geometry/Manifold/ContMDiff/NormedSpace.lean,Mathlib/Geometry/Manifold/MFDeriv/NormedSpace.lean |
2 |
2 |
['github-actions', 'mathlib-dependent-issues'] |
nobody |
3-37436 3 days ago |
3-42153 3 days ago |
3-42398 3 days |
0 |
| 44585 |
grunweg author:grunweg |
chore: simplify guessing of base field in custom elaboators |
Given a space of continuous linear (or alternating linear) maps, we can read off the base field directly: no need to recurse into the domain there.
---
- [x] depends on: #44561
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|
t-differential-geometry |
8/11 |
Mathlib/Geometry/Manifold/Notation.lean |
1 |
3 |
['github-actions', 'mathlib-dependent-issues'] |
nobody |
3-37244 3 days ago |
3-42150 3 days ago |
3-42301 3 days |
0 |
| 40727 |
pepamontero author:pepamontero |
feat(Geometry/Manifold/Instances/Quotient): quotients of manifolds by smooth free properly discontinuous group actions are manifolds |
Add smooth manifold structure on orbit space `orbitRel.Quotient G M`.
This PR is a follow-up to #35653, which equipped `orbitRel.Quotient G M` with a `ChartedSpace` structure. Here we promote that to an `IsManifold I n` instance, assuming M itself is an `IsManifold I n` and `G` acts by
`ContMDiffConstSMul`.
This PR:
* Changes the charted space instance to use `IsLocalHomeomorph.chartedSpaceOfRightInverse` applied to `Quotient.out_eq`, so the charts come from an explicit local section `orbitRel.Quotient.localInverseAt x` of the quotient map at `x.out`.
* Adds some API on `localInverseAt` that is only relevant when we have an action (`localInverseAt_apply_mk_eq_smul`, `localInverseAt_symm_trans_eqOn_smul`, `exists_smul_mem_localInverseAt_target`)
* Defines the `transitionMap` between the charts of the quotient, and adds `transitionMap_locally_smul` which shows each transition map agrees near any point with `φ x⁻¹ ≫ (g • ·) ≫ φ y` for a single `g : G`.
* Uses the above to prove `isManifold_quotient_of_contMDiffSMul`.
This started as an ItaLean2025 project; here is the [Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/541885-ItaLean-2025/topic/Projects.3A.20Quotient.20Manifolds/with/575121158) dedicated to it.
Co-authored by: Enrique Díaz Blanco <qdiazblanco@gmail.com>
Co-authored by: Archie Browne <ajb421@ic.ac.uk>
--------
- [x] depends on: #41832
- [x] depends on: #41835
- [x] depends on: #42436
- [x] depends on: #42502
- [x] depends on: #41534
- [x] depends on: #43717
**Questions for reviewers**:
1. Should the acting group be `Γ` rather than `G`? Here `G` has no topology, and in other files `Γ` is used in this case.
2. Should `localInverseAt` be a `def` instead of an `abbrev`? It is an `abbrev` because there is already API for `IsLocalHomeomorph.localInverseAt` that I need.
3. Is changing the `ChartedSpace` instance to `Quotient.out` the right decision?
4. Should I write a definition for `(chartAt H x.out).symm ≫ₕ (g • ·) ≫ₕ chartAt H y.out` , similar to `transitionMap`?
|
new-contributor
large-import
t-differential-geometry
maintainer-merge
|
131/6 |
Mathlib/Geometry/Manifold/Instances/Quotient.lean |
1 |
87 |
['Deicyde', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'pepamontero', 'scholzhannah'] |
grunweg assignee:grunweg |
3-34043 3 days ago |
4-43573 4 days ago |
55-9702 55 days |
1 |
| 40197 |
plp127 author:plp127 |
feat: valuation of an algebraic element |
We prove that if `x` is algebraic over `K` then there exists some `n ≠ 0` such that the valuation of `x` raised to the `n`-th power is equal to the valuation of some element of `K`.
---
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|
t-ring-theory |
62/0 |
Mathlib.lean,Mathlib/RingTheory/Valuation/Algebraic.lean,Mathlib/RingTheory/Valuation/Basic.lean |
3 |
17 |
['github-actions', 'jjdishere', 'plp127'] |
mattrobball assignee:mattrobball |
3-30621 3 days ago |
3-31558 3 days ago |
120-12692 120 days |
0 |
| 44840 |
grunweg author:grunweg |
chore: rename ContDiffAt.hasStrict(F)DerivAt to hasStrict(F)DerivAt_(… |
Currently, mathlib has both `ContDiffAt.hasStrict(F)DerivAt` and `ContDiffAt.hasStrict(F)DerivAt'`: avoid the primed names by
- renaming `ContDiffAt.hasStrict(F)DerivAt` to `ContDiffAt.hasStrict(F)DerivAt_(f)deriv` (which describes their statement more faithfully), and
- renaming `ContDiffAt.hasStrict(F)DerivAt'` to `ContDiffAt.hasStrict(F)DerivAt`
Because this is a cyclic rename, we can only generate deprecations for half of these.
---
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|
t-analysis |
33/25 |
Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Analysis/Calculus/ImplicitContDiff.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ContDiff.lean,Mathlib/Analysis/SpecialFunctions/ExpDeriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean |
5 |
1 |
['github-actions'] |
nobody |
3-24218 3 days ago |
3-24271 3 days ago |
3-24266 3 days |
3 |
| 44832 |
marcelolynch author:marcelolynch |
ci(cache): stop uploading to Azure |
CI uploads every container to R2 only. This PR removes the Azure upload steps and the `cache_application_id` input from `build_template.yml`.
Current readers are not affected:
- A cache tool from v4.34.0 or later reads `master` and `forks` through the cache resolver, which serves them from R2.
- An older cache tool reads `master` from Azure, but only artifacts of its own toolchain. Those artifacts are already in Azure.
- The nightly-testing repository does not upload to Azure.
The `MATHLIB_CACHE_DEBUG_USE_LEGACY` switch reads `master` from Azure, so it misses every commit that CI builds after this PR. #44834 removes the switch and makes the other cache tool changes. It depends on this PR and should merge soon after it.
🤖
|
CI |
18/68 |
.github/actions/get-cache/action.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_template.yml,.github/workflows/release_cache.yml,Cache/SECURITY.md |
6 |
4 |
['bryangingechen', 'github-actions', 'marcelolynch', 'mathlib-bors'] |
nobody |
3-20539 3 days ago |
3-31395 3 days ago |
3-31388 3 days |
0 |
| 44843 |
mathlib-splicebot author:mathlib-splicebot |
feat: `isInvertible_fderivWithin_writtenInExtChartAt` |
If the `mfderiv` of `f` is injective (invertible), so is the fderivWithin of `f` written in extended charts. |
t-differential-geometry |
16/4 |
Mathlib/Geometry/Manifold/MFDeriv/Basic.lean |
1 |
1 |
['github-actions'] |
nobody |
3-20265 3 days ago |
3-22866 3 days ago |
3-22859 3 days |
2 |
| 44834 |
marcelolynch author:marcelolynch |
chore(cache): remove Azure reads and (dev) writes from the client |
This PR removes the `MATHLIB_CACHE_DEBUG_USE_LEGACY` read switch and the Azure account URL from the cache tool. The tool reads from `https://cache.mathlib.org`, or from `MATHLIB_CACHE_BASE_URL` when it is set. The cache resolver serves both containers from R2 only, so the switch is the last path from the tool to Azure.
This PR also changes the default upload backend from `azure` to `s3`. The tool keeps the `azure` backend as a fallback, for uploads to the endpoint in `MATHLIB_CACHE_PUT_URL` only.
🤖
|
CI |
135/303 |
.github/actions/get-cache/action.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_template.yml,.github/workflows/release_cache.yml,Cache/CI.md,Cache/Infra.lean,Cache/Main.lean,Cache/Query.lean,Cache/README.md,Cache/Requests.lean,Cache/SECURITY.md,Cache/Test.lean,Cache/Upload/Azure.lean,Cache/Upload/Defs.lean,Cache/Upload/S3.lean |
16 |
3 |
['github-actions', 'marcelolynch', 'mathlib-bors'] |
nobody |
3-20119 3 days ago |
3-20840 3 days ago |
3-20833 3 days |
0 |
| 44761 |
mortarsanjaya author:mortarsanjaya |
refactor: unify `CharZero` with `CharP` |
This PR attempts to unify the `CharZero` class with the `CharP` class via changing the definition of `CharP`; see the TODO in [Algebra/CharZero/Defs](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/CharZero/Defs.html#CharZero). The main goal is to make `CharZero R` equivalent to `CharP R 0` in all cases, and so we can possibly deprecate `CharZero` later on, whereas the old definition of `CharP R 0` is not equivalent to `CharZero R` for semirings whose addition is not cancellative. In positive characteristic, the new definition is still equivalent to the old definition.
A cost of the unification is that `ringChar` would require an `IsLeftCancelAdd` instance, which might be inconvenient for semirings but is a non-issue for rings.
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This also invalidates the counterexample that shows `CharP R 0` does not always imply `CharZero R`.
See the discussion on [this Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Unifying.20.60CharZero.60.20with.20.60CharP.60/with/630744702). |
t-algebra
file-removed
tech debt
large-import
label:t-algebra$ |
208/257 |
Counterexamples.lean,Counterexamples/CharPZeroNeCharZero.lean,Mathlib/Algebra/CharP/Algebra.lean,Mathlib/Algebra/CharP/Basic.lean,Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/CharP/Invertible.lean,Mathlib/Algebra/CharP/LinearMaps.lean,Mathlib/Algebra/CharP/LocalRing.lean,Mathlib/Algebra/CharP/Pi.lean,Mathlib/Algebra/CharP/Quotient.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/CharZero/Defs.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/FieldTheory/PerfectClosure.lean,Mathlib/GroupTheory/Exponent.lean,Mathlib/GroupTheory/Order/Min.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/LinearAlgebra/Matrix/CharP.lean,Mathlib/NumberTheory/FLT/Polynomial.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/NumberTheory/MulChar/Basic.lean,Mathlib/RingTheory/Ideal/Int.lean,Mathlib/RingTheory/MvPolynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Basic.lean |
26 |
8 |
['JX-Mo', 'github-actions', 'mortarsanjaya'] |
nobody |
3-18915 3 days ago |
3-71507 3 days ago |
3-71500 3 days |
0 |
| 42836 |
loefflerd author:loefflerd |
feat(NumberTheory/Padics): the Amice transform is a ring isomorphism |
Show that the Amice-transform isomorphism from measures on `ℤ_[p]` to `ℤ_[p]⟦X⟧` is an isomorphism of rings, when the measures are equipped with the ring structure defined by convolution.
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|
t-number-theory |
117/1 |
Mathlib/NumberTheory/Padics/Measure/AmiceTransform.lean,Mathlib/Topology/Constructions.lean |
2 |
7 |
['MichaelStollBayreuth', 'github-actions', 'loefflerd', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
MichaelStollBayreuth assignee:MichaelStollBayreuth |
3-18031 3 days ago |
3-19892 3 days ago |
21-8535 21 days |
0 |
| 42865 |
WilliamCoram author:WilliamCoram |
refactor: change definition of operator norm to depend only on modules over semirings |
We restructure the operator norm definition so that `opNorm` only takes in modules over semirings.
This is a reduction from `NontriviallyNormedField`; the goal of this is to allow us to have theories of operator norms in different settings (e.g. modules over Banach-Tate rings) without making duplicate statements.
AI disclosure: The need for the new operator norm definition appeared in a project I was using Claude to help autoformalise (see [Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/compact.20operators.20and.20Fredholm.20determinant/with/572850121)). However, this generalisation of the operator norm definition was hand-written to avoid Claude's duplication it created.
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|
t-analysis |
92/56 |
Mathlib/Analysis/Calculus/ContDiff/Convolution.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Normed/Operator/Basic.lean,Mathlib/Geometry/Manifold/Riemannian/Basic.lean |
4 |
2 |
['WilliamCoram', 'github-actions'] |
nobody |
3-15417 3 days ago |
3-16920 3 days ago |
3-18291 3 days |
0 |
| 43871 |
manman4 author:manman4 |
feat(PowerSeries): add Lagrange inversion formula |
## What this PR adds
This PR formalizes the Lagrange inversion formula for formal power series over commutative rings without additive torsion (`HasUniqueDiv R`), together with divided versions over characteristic-zero fields.
For formal power series `P`, `Y`, and `H` over such a ring, suppose `Y = X * P.subst Y`. Then, for every natural number `n`, the Lagrange–Bürmann formula states:
```math
(n + 1)[X^{n + 1}]H(Y) = [X^n](H' P^{n + 1}).
```
The brackets denote coefficient extraction, and `H'` denotes the formal derivative of `H`. Over a characteristic-zero field, dividing by `n + 1` gives the usual coefficient formula.
## Proof and scope
The proof follows the inductive argument of Surya and Warnke. The torsion-free assumption is used to cancel multiplication by positive natural numbers.
Following the review suggestions, this PR is restricted to the torsion-free version.
## Motivation
Lagrange inversion is a classical tool in enumerative combinatorics, treated for example in Section 5.4 of Richard P. Stanley’s *Enumerative Combinatorics*, Volume 2. It gives coefficient formulas for implicitly defined generating functions, with applications to counting rooted trees and other recursively defined combinatorial structures.
My original motivation was to make this tool, which is also used in competitive programming, available in Mathlib.
## LLM
We (Julian and I) used Aristotle and Codex for code generation and ChatGPT and Claude for cleanup.
|
t-ring-theory
new-contributor
LLM-generated
|
212/0 |
Mathlib.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Derivative.lean,Mathlib/RingTheory/PowerSeries/LagrangeInversion.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean,docs/references.bib |
6 |
126 |
['JX-Mo', 'Julian-Kuelshammer', 'github-actions', 'manman4', 'wwylele'] |
nobody |
3-14393 3 days ago |
13-49887 13 days ago |
30-44854 30 days |
0 |
| 44845 |
DanielJHorton author:DanielJHorton |
feat(LinearAlgebra/PiTensorProduct/Projective): implement properties of tensor products of families of projective modules |
This PR adds a new file `LinearAlgebra/PiTensorProduct/Projective` which develops the properties of tensor products of families of projective modules. Results for binary tensor products from `LinearAlgebra/Contraction` are extended to `PiTensorProduct`, and the main result `dualDistribEquiv` of `LinearAlgebra/PiTensorProduct/Dual` is generalized from free modules over a ring to projective modules over a semiring.
The major results are:
- `PiTensorProduct.Projective` - An instance proving that the tensor product of a finite collection of projective modules is projective.
- `PiTensorProduct.piTensorHomEquiv` - A linear equivalence whose underlying linear map is `piTensorHomMap` from `LinearAlgebra/PiTensorProduct/Basic`.
- `PiTensorProduct.dualDistribEquivOfProjective` - A linear equivalence whose underlying map is `dualDistrib` from `LinearAlgebra/PiTensorProduct/Dual`. This generalizes `dualDistribEquiv`, replacing hypotheses `[CommRing R]` and `[Module.Free R (P i)]` with `[CommSemiring R]` and `[Module.Projective R (P i)]`.
This PR also adds a small definition `dualBaseRingEquiv (R : Type*) [CommSemiring R] : Dual R R ≃ₗ[R] R` to `LinearAlgebra/Dual/Defs` (as well as associated `@[simp]` lemmas) which were used in some of the proofs.
Disclamer: I am still a relatively new contributor here and this is my largest PR so far. I am grateful for the time of any reviewers who look at this PR and I am happy to answer any questions about implementation/design choices.
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|
t-algebra label:t-algebra$ |
216/1 |
Mathlib.lean,Mathlib/LinearAlgebra/Dual/Defs.lean,Mathlib/LinearAlgebra/PiTensorProduct/Projective.lean |
3 |
1 |
['github-actions'] |
nobody |
3-13226 3 days ago |
3-14701 3 days ago |
3-16607 3 days |
0 |
| 43858 |
BoltonBailey author:BoltonBailey |
chore(Algebra/GroupWithZero/Units/Basic): rename three lemmas `'` -> `₀` |
This PR comes about as a result of using Claude to look for easy reductions to the docPrime linter. Claude turned up three lemmas about GroupWithZero named with primes which are analogous to unprimed lemmas about groups. This PR renames them to use the usual convention of naming such lemmas with an underscored zero.
- `div_left_inj'`
- `div_div_cancel_left'`
- `div_div_div_cancel_left'`
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|
tech debt
LLM-generated
t-algebra
label:t-algebra$ |
28/25 |
Mathlib/Algebra/Field/ModEq.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Analysis/BoxIntegral/UnitPartition.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Normed/Algebra/QuaternionExponential.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Geometry/Euclidean/Angle/Bisector.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/Affine.lean,Mathlib/NumberTheory/FLT/Basic.lean,Mathlib/NumberTheory/Height/NumberField.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaEven.lean,Mathlib/NumberTheory/LSeries/ZMod.lean,Mathlib/NumberTheory/PythagoreanTriples.lean,Mathlib/Probability/Distributions/Gaussian/CharFun.lean,Mathlib/Probability/Distributions/Gaussian/HasGaussianLaw/Independence.lean,Mathlib/RingTheory/Invariant/Basic.lean,Mathlib/Topology/Instances/AddCircle/Real.lean,scripts/nolints_prime_decls.txt |
19 |
4 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
3-10288 3 days ago |
3-13171 3 days ago |
25-44333 25 days |
0 |
| 43472 |
gasparattila author:gasparattila |
refactor: replace `SemilatticeSup.sup` with `max` |
This PR replaces the `sup` field of `SemilatticeSup` with `Max.max`. This will enable further refactors such as redefining `SemilatticeSup` using `Std.LawfulOrderSup` or making `LinearOrder` extend `Lattice`.
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|
t-order |
161/194 |
Archive/MinimalSheffer.lean,Archive/Robbins.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Submodule.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Submodule.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Ring/Idempotent.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Tropical/Lattice.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean,Mathlib/AlgebraicTopology/SimplicialComplex/Basic.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/Convex/SimplicialComplex/Basic.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/Normed/Module/MStructure.lean,Mathlib/Analysis/Normed/Module/Seminorm/Basic.lean,Mathlib/Basic/PEquiv.lean,Mathlib/Basic/Real/Basic.lean,Mathlib/CategoryTheory/Groupoid/Subgroupoid.lean,Mathlib/CategoryTheory/Limits/Preorder.lean,Mathlib/CategoryTheory/Sites/Coverage.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/CategoryTheory/Sites/Sieves/Basic.lean,Mathlib/CategoryTheory/Subfunctor/Basic.lean,Mathlib/CategoryTheory/Subfunctor/SubmonoidFunctor.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Combinatorics/Graph/Lattice.lean,Mathlib/Computability/Reduce.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Multiset/UnionInter.lean,Mathlib/Data/Semiquot.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/Geometry/Convex/Cone/Face/Lattice.lean,Mathlib/Geometry/Manifold/StructureGroupoid.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/ModelTheory/Substructures.lean,Mathlib/Order/BooleanSubalgebra.lean,Mathlib/Order/Booleanisation.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/Copy.lean,Mathlib/Order/Defs/Lattice.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/FixedPoints.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Order/Hom/Order.lean,Mathlib/Order/Ideal.lean,Mathlib/Order/Interval/Basic.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/Partition/Basic.lean,Mathlib/Order/Partition/Finpartition.lean,Mathlib/Order/Preorder/Finsupp.lean,Mathlib/Order/PropInstances.lean,Mathlib/Order/Setoid/Basic.lean,Mathlib/Order/Sublattice.lean,Mathlib/Order/Sum/Lattice.lean,Mathlib/Order/WithBot.lean,Mathlib/Probability/Process/Filtration.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Small.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/TwoSidedIdeal/Lattice.lean,Mathlib/RingTheory/UniqueFactorizationDomain/FactorSet.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/Group/GroupTopology.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean,Mathlib/Topology/Category/TopCat/OpenNhds.lean,Mathlib/Topology/LocallyFinsupp.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/Sets/Compacts.lean,Mathlib/Topology/UniformSpace/Basic.lean,MathlibTest/DefEqAbuse.lean |
92 |
11 |
['JovanGerb', 'gasparattila', 'github-actions', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
3-7087 3 days ago |
3-10577 3 days ago |
12-40950 12 days |
0 |
| 41308 |
sergantche author:sergantche |
feat: add `List.insertIdx_eraseIdx_getElem_perm` |
Adds `List.insertIdx_eraseIdx_getElem_perm`, showing that erasing an element by index and inserting it at any valid position gives a permutation of the original list.
This packages the existing lemmas `List.perm_insertIdx` and `List.getElem_cons_eraseIdx_perm` into a direct API lemma.
AI assistance was used in preparing this PR; I reviewed the statement and proof.
[](https://gitpod.io/from-referrer/) |
t-data
new-contributor
LLM-generated
|
5/0 |
Mathlib/Data/List/Perm/Basic.lean |
1 |
5 |
['github-actions', 'sergantche', 'vlad902'] |
eric-wieser assignee:eric-wieser |
3-6103 3 days ago |
96-15975 96 days ago |
100-19363 100 days |
0 |
| 41905 |
wwylele author:wwylele |
feat(FieldTheory): relrank lemma about sup |
The main lemma I want is `(A ⊔ C).relrank (B ⊔ C) ≤ A.relrank B`. Added some trivial lemma along the way.
---
AI usage disclosure: this was originally drafted by Aristotle, then cleaned up by me.
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[](https://gitpod.io/from-referrer/)
|
t-algebra
LLM-generated
label:t-algebra$ |
91/0 |
Mathlib/FieldTheory/Relrank.lean |
1 |
11 |
['copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'sharky564'] |
ocfnash assignee:ocfnash |
3-6102 3 days ago |
90-17479 90 days ago |
90-17472 90 days |
0 |
| 41918 |
CoolRmal author:CoolRmal |
feat(Topology/Order): separability is hereditary for linearly ordered topological spaces |
In this PR we prove that
1. `isTopologicalBasis_isOpen_ordConnected`: in a linearly ordered topological space, every point of an open set `U` has an open `Set.OrdConnected` neighbourhood contained in `U`.
2. `countable_setOf_isolated_subtype`: in a separable linearly ordered topological space, the points of a subset `s` that are isolated in the subspace `s` form a countable set.
3. A subset of a separable linearly ordered topological space is separable in the subspace topology. This is proved as an instance.
The material was developed for showing the measurability of the pathwise variation of a continuous stochastic process in https://github.com/RemyDegenne/brownian-motion/pull/494. Created with the help of Claude Code, carefully reviewed and golfed by myself.
|
t-topology |
153/0 |
Mathlib.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/Order/Separable.lean |
3 |
2 |
['CoolRmal', 'felixpernegger', 'github-actions'] |
j-loreaux assignee:j-loreaux |
3-6101 3 days ago |
78-84905 78 days ago |
89-79366 89 days |
1 |
| 44029 |
seewoo5 author:seewoo5 |
feat(ModularForms): derivative of discriminant form |
---
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$\Delta' = E_2 \Delta$ and $\partial_{12} \Delta = 0$. From Sphere packing project, initially written by Claude.
(c.f. I thought that this would follow from Ramanujan formula and $\Delta = (E_4^3 - E_6^2)/1728$, until I (re-)realize that $E_2$ is defined as logarithmic derivative of Dedekind eta function and we have much shorter proof.)
[](https://gitpod.io/from-referrer/)
|
t-number-theory
LLM-generated
sphere-packing
|
25/2 |
Mathlib/NumberTheory/ModularForms/Discriminant.lean |
1 |
3 |
['github-actions', 'mathlib-merge-conflicts'] |
MichaelStollBayreuth assignee:MichaelStollBayreuth |
3-6100 3 days ago |
6-80962 6 days ago |
25-13815 25 days |
0 |
| 44061 |
teorth author:teorth |
feat(NumberTheory/Mertens): abstract theory of Mertens weights |
This is the first of a three-PR stack splitting the Mertens theorems
development (#41394) into pieces under 500 LoC each.
It introduces `Mathlib/NumberTheory/Mertens/Weight.lean`: the abstract theory
of *Mertens weights* — the `Mertens.Weight` structure and the basic estimates
attached to it (the `E₁`/`E₂` error bounds, `sum_sub_log_*`, `M_bounds`,
`sum_div_log_*`, …). No concrete weight is constructed here; this will be done in #44062.
---
The code was human-generated, but reviewed by AI.
- [x] depends on: #41120
- [x] depends on: #43471
[](https://gitpod.io/from-referrer/)
|
t-number-theory |
502/0 |
Mathlib.lean,Mathlib/NumberTheory/Mertens/Weight.lean |
2 |
10 |
['amellendijk', 'github-actions', 'loefflerd', 'mathlib-dependent-issues', 'xroblot'] |
MichaelStollBayreuth assignee:MichaelStollBayreuth |
3-6099 3 days ago |
15-44746 15 days ago |
23-85233 23 days |
2 |
| 44278 |
justus-springer author:justus-springer |
doc(AlgebraicGeometry/Birational/*): improve stacks tags |
---
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|
t-algebraic-geometry |
10/1 |
Mathlib/AlgebraicGeometry/Birational/Birational.lean,Mathlib/AlgebraicGeometry/Birational/RationalMap.lean |
2 |
1 |
['github-actions'] |
joelriou assignee:joelriou |
3-6098 3 days ago |
18-58170 18 days ago |
18-58245 18 days |
0 |
| 41887 |
Ljon4ik4 author:Ljon4ik4 |
feat: lemmas showing properties of ofDerivation added |
Given an `R`-Lie algebra `L` and a commutative `R`-algebra `A`, there is a Lie algebra structure on `(A ⊗[R] L)`.
A derivation of `A` induces a Lie derivation of `(A ⊗[R] L)`, and one obtains a Lie algebra map
```
ofDerivation : Derivation R A A →ₗ⁅R⁆ LieDerivation R (A ⊗[R] L) (A ⊗[R] L)
```
In this PR we add a Lemma showing that `ofDerivation` is in fact `A`-linear, and that the resulting LieDerivation satisfies a Leibniz rule with respect to the `A`-multiplication on `A ⊗[R] L`.
---
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[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
17/0 |
Mathlib/Algebra/Lie/Derivation/BaseChange.lean |
1 |
2 |
['eric-wieser', 'github-actions'] |
nobody |
3-5196 3 days ago |
24-24141 24 days ago |
89-76145 89 days |
0 |
| 42820 |
tolgadgrmnc27 author:tolgadgrmnc27 |
feat(Data/Nat/Choose): elementary Chernoff bound for tail sums of binomial coefficients |
Adds an elementary, purely combinatorial Chernoff-type bound on tail sums of
binomial coefficients:
```lean
theorem Nat.sum_Ico_choose_le_div (n m : ℕ) {x : α} (hx : 1 ≤ x) :
∑ j ∈ Ico m (n + 1), (n.choose j : α) ≤ (1 + x) ^ n / x ^ m
```
together with the specialization at `x = 2`:
```lean
theorem Nat.sum_Ico_choose_le_three_pow_div (n m : ℕ) :
∑ j ∈ Ico m (n + 1), (n.choose j : α) ≤ 3 ^ n / 2 ^ m
```
The proof is the classical exponential moment trick done combinatorially: for
`m ≤ j` and `1 ≤ x` we have `x ^ m ≤ x ^ j`, so the tail sum is bounded by
`x ^ (-m) * ∑ j, n.choose j * x ^ j = x ^ (-m) * (1 + x) ^ n` by the binomial
theorem. A helper `Nat.sum_range_choose_mul_pow` states the binomial theorem in
the convenient form `∑ j ≤ n, n.choose j * x ^ j = (1 + x) ^ n`.
### Why this is not already in Mathlib
* `Nat.sum_range_choose` gives the *total* sum `∑ j ≤ n, n.choose j = 2 ^ n`.
* `Mathlib/Data/Nat/Choose/Bounds.lean` bounds a *single* coefficient
(`choose_le_pow`, `choose_le_two_pow`, `choose_le_pow_div`, …).
* `Mathlib/Probability/Moments/SubGaussian.lean` has Chernoff/Hoeffding, but
measure-theoretically: using it for a counting argument requires setting up a
probability space with independent Bernoulli variables and translating back
to cardinalities.
I could not find a statement bounding a *partial* sum of binomial
coefficients. The version here needs no probability space and applies directly
to counting arguments (its original use was bounding the number of `n < 2 ^ k`
whose first `k` binary digits contain at least `m` ones).
### Notes
* Stated over a general `[Semifield α] [LinearOrder α] [IsStrictOrderedRing α]`,
matching the typeclass style of `Mathlib/Data/Nat/Choose/Bounds.lean`.
* `Ico m (n + 1)` rather than a `filter (m ≤ ·)` form, as is idiomatic in
Mathlib; the two are equal by `Finset.filter_le_eq_Ico`-style reasoning.
* Names are of course open to bikeshedding.
---
- [x] depends on: nothing
|
t-data
new-contributor
|
84/0 |
Mathlib.lean,Mathlib/Data/Nat/Choose/Tail.lean |
2 |
3 |
['github-actions'] |
nobody |
3-5192 3 days ago |
61-53476 61 days ago |
61-53469 61 days |
0 |
| 43723 |
homeowmorphism author:homeowmorphism |
feat(Topology/MetricSpace): define hyperbolic pseudometric spaces |
We define hyperbolic pseudometric spaces using the Gromov product. This will be used to define hyperbolic groups.
Co-authored-by: Katerina Hristova <katherina.hristova@gmail.com>
---
- [x] depends on: #43641
Use of AI: Claude Fable was used to look up things quickly and sketch the API, but this was mostly written (or rewritten) by hand.
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[](https://gitpod.io/from-referrer/)
|
t-topology |
111/0 |
Mathlib.lean,Mathlib/Topology/Bornology/Basic.lean,Mathlib/Topology/MetricSpace/Hyperbolic.lean |
3 |
15 |
['SnirBroshi', 'github-actions', 'homeowmorphism', 'mathlib-dependent-issues', 'tb65536', 'vlad902'] |
nobody |
3-3692 3 days ago |
16-39325 16 days ago |
34-79142 34 days |
1 |
| 43324 |
plp127 author:plp127 |
feat: fine uniformity |
This PR continues the work from #24016.
Original PR: https://github.com/leanprover-community/mathlib4/pull/24016
---
- [x] depends on: #43312 |
t-topology |
130/0 |
Mathlib.lean,Mathlib/Topology/UniformSpace/FineUniformity.lean |
2 |
2 |
['github-actions', 'mathlib-dependent-issues'] |
nobody |
3-2045 3 days ago |
3-3341 3 days ago |
3-4278 3 days |
0 |
| 44060 |
wwylele author:wwylele |
feat(Geometry/Euclidean): lemma about excenters and volumes |
This proves that volume = inradius * surface / n
---
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[](https://gitpod.io/from-referrer/)
|
t-euclidean-geometry
maintainer-merge
|
112/0 |
Mathlib.lean,Mathlib/Geometry/Euclidean/Volume/Incenter.lean |
2 |
8 |
['SnirBroshi', 'copilot-pull-request-reviewer', 'github-actions', 'jsm28', 'wwylele'] |
nobody |
2-84651 2 days ago |
25-1963 25 days ago |
25-1956 25 days |
2 |
| 41220 |
wwylele author:wwylele |
feat(Geometry/Euclidean): two formula for area of a triangle |
This PR proves two basic formulas for triangle area: `s = 1/2 * h * b = 1/2 * a * b * sin C`
---
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- [ ] depends on #37910
[](https://gitpod.io/from-referrer/)
|
t-euclidean-geometry
maintainer-merge
|
108/0 |
Mathlib.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Projection.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/Geometry/Euclidean/Volume/Triangle.lean |
5 |
19 |
['SnirBroshi', 'copilot-pull-request-reviewer', 'github-actions', 'jsm28', 'mathlib-bors', 'mathlib-merge-conflicts', 'wwylele'] |
jsm28 assignee:jsm28 |
2-84413 2 days ago |
11-26632 11 days ago |
24-85931 24 days |
3 |
| 43853 |
wwylele author:wwylele |
feat(Analysis/SpecialFunctions): the recurrence relation of bessel function J |
This proves one of the recurrence formula for J (the other one that involves derivative will be in a separate PR). Usually the LHS is written as `2 * a * J a x / x` in textbooks, but I moved `x` to RHS to avoid junk values on division.
Also added dlmf to `besselJ`.
---
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|
t-analysis |
92/2 |
Mathlib/Analysis/SpecialFunctions/Bessel.lean,Mathlib/Analysis/SpecialFunctions/RegularizedHypergeometric.lean,Mathlib/Topology/Algebra/InfiniteSum/Defs.lean,Mathlib/Topology/Algebra/InfiniteSum/Ring.lean |
4 |
10 |
['copilot-pull-request-reviewer', 'github-actions', 'mcdoll', 'wwylele'] |
mcdoll assignee:mcdoll |
2-83514 2 days ago |
11-35312 11 days ago |
30-86312 30 days |
0 |
| 42802 |
Zeta-Wu author:Zeta-Wu |
feat(CategoryTheory): relate equivalences and skeletons |
This PR supersedes the previously closed PR #42789.
It adds several related characterizations of equivalences of categories, together with an API showing that an equivalence induces an isomorphism between the corresponding skeletons.
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|
t-category-theory
new-contributor
|
66/8 |
Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/Skeletal.lean |
2 |
36 |
['Zeta-Wu', 'github-actions', 'joelriou', 'robin-carlier'] |
joelriou assignee:joelriou |
2-79888 2 days ago |
2-81226 2 days ago |
54-30732 54 days |
0 |
| 39347 |
Sfgangloff author:Sfgangloff |
feat(SymbolicDynamics): refactor of Pattern and shift-invariance of shape languages for subshifts |
## Summary
This PR refactors Pattern.mulShift in Mathlib/Dynamics/SymbolicDynamics/Basic.lean and uses the cleaner definition to prove shift-invariance of the language of a subshift on a finite shape.
## Changes
Pattern.mulShift now returns a Pattern instead of a configuration (more natural).
- Old type: Pattern.mulShift : Pattern A G → G → (G → A)
- New type: Pattern.mulShift : Pattern A G → G → Pattern A G
- The result carries its support (p.support.image (v * ·)) and the
default-outside-support proof, so callers don't have to re-derive them.
The [IsLeftCancelMul G] hypothesis is moved to the lemmas that actually use it.
- The definition Pattern.mulShift itself no longer needs left-cancellation (it only
chooses a preimage noncomputably).
- The hypothesis is now stated on mulShift_config_apply_mul_left_of_mem and
mulOccursInAt_eq_cylinder directly, instead of being a section-level variable.
Renames following the type change.
- mulShift_apply_mul_left_of_mem → mulShift_config_apply_mul_left_of_mem (because we
now write (p.mulShift v).config instead of p.mulShift v).
New @[simp] and @[ext] lemmas for Pattern.
- Pattern.ext: two patterns are equal iff their supports agree and their
configurations agree on the support.
- Pattern.mulShift_support: the support of p.mulShift v is p.support.image (v * ·).
- Pattern.fromConfig_support: the support of fromConfig x U is U.
- Pattern.fromConfig_config_of_mem: on its support, fromConfig x U agrees with x.
New lemma Pattern.fromConfig_mulShift.
For a left inverse g' * g = 1, shifting the pattern fromConfig x U by g equals
fromConfig (mulShift g' x) (U.image (g * ·)).
New theorem MulSubshift.languageOn_image_mulShift.
For a subshift Y and elements g, g' with g * g' = 1 and g' * g = 1:
(fun p => p.mulShift g) '' Y.languageOn U = Y.languageOn (U.image (g * ·))
i.e. the language on the translated shape is exactly the image of the language on U
under the pattern-shift map. This gives a bijection between Y.languageOn U and
Y.languageOn (U.image (g * ·)), with inverse p ↦ p.mulShift g'. Stated for
left-cancellative monoids with an invertible element.
Updated docstrings for Pattern.mulShift and the renamed lemma to reflect the
bundled-Pattern return type and clarify which results need [IsLeftCancelMul G]. |
t-dynamics
new-contributor
|
144/47 |
Mathlib/Dynamics/SymbolicDynamics/Basic.lean |
1 |
13 |
['Sfgangloff', 'github-actions', 'mathlib-merge-conflicts', 'sgouezel'] |
urkud assignee:urkud |
2-68634 2 days ago |
2-69240 2 days ago |
63-20354 63 days |
0 |
| 44798 |
3y3y3y-huaiji author:3y3y3y-huaiji |
style(Order/Heyting): rename inf_himp to inf_himp_self |
Rename `inf_himp` to `inf_himp_self` to align with its dual `sup_sdiff_self` and companion lemma `himp_inf_self`, resolving an in-code TODO. Add a deprecated alias `inf_himp`.
---
> [!NOTE]
> **LLM Disclosure / AI Use**: This PR was prepared with the assistance of an LLM (`LLM-generated`). All proofs and statements have been formally verified by Lean 4 and checked with linters.
|
t-order
LLM-generated
new-contributor
|
5/4 |
Mathlib/Order/Heyting/Basic.lean |
1 |
3 |
['3y3y3y-huaiji', 'github-actions', 'plp127', 'vihdzp'] |
nobody |
2-65478 2 days ago |
4-30969 4 days ago |
4-30962 4 days |
0 |
| 43577 |
javgomzar author:javgomzar |
chore(Order/BooleanAlgebra): Add push tags |
Add push tags to some lemmas in Mathlib/Order/BooleanAlgebra/Set.lean
---
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|
t-order
new-contributor
|
19/4 |
Mathlib/Order/BooleanAlgebra/Set.lean |
1 |
4 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
2-61256 2 days ago |
2-63791 2 days ago |
38-32439 38 days |
0 |
| 44856 |
ocfnash author:ocfnash |
feat: add `wanted` statements about Cartan matrices |
Moreover Mathlib knows enough about Lie algebras and root systems, that closing these `sorry`s would allow us to prove the classification of semisimple Lie algebras. |
|
47/0 |
Wanted.lean,Wanted/LinearAlgebra/Matrix/Cartan/Basic.lean |
2 |
1 |
['github-actions'] |
nobody |
2-60571 2 days ago |
2-61134 2 days ago |
2-61231 2 days |
0 |
| 44793 |
vihdzp author:vihdzp |
feat: every element is between two others in a club set |
As well as further lemmas about normal functions and club sets.
Used in the CGT repo.
---
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|
t-order
maintainer-merge
|
82/30 |
Mathlib/Order/Cofinal.lean,Mathlib/Order/IsNormal.lean,Mathlib/Order/WellFounded.lean,Mathlib/SetTheory/Cardinal/Cofinality/Club.lean,Mathlib/SetTheory/Cardinal/Cofinality/Enum.lean |
5 |
8 |
['YaelDillies', 'chenson2018', 'github-actions', 'vihdzp'] |
nobody |
2-60101 2 days ago |
2-85405 2 days ago |
3-71358 3 days |
0 |
| 44858 |
vihdzp author:vihdzp |
feat: connect regular cardinal orders to regular cardinals |
---
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|
t-set-theory |
10/0 |
Mathlib/SetTheory/Cardinal/Regular.lean |
1 |
1 |
['github-actions'] |
nobody |
2-59520 2 days ago |
2-60797 2 days ago |
2-60790 2 days |
0 |
| 44855 |
vihdzp author:vihdzp |
feat: link `Order.enum` to `Subtype.orderIsoOfNat` |
---
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|
t-set-theory
large-import
|
15/3 |
Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Cofinality/Enum.lean |
2 |
2 |
['github-actions', 'vihdzp'] |
nobody |
2-58035 2 days ago |
2-60701 2 days ago |
2-61343 2 days |
0 |
| 36428 |
wrenna-robson author:wrenna-robson |
feat(Logic/Equiv/Fin): Streamline equiv definitions using mkDivMod |
This PR uses Fin.mkDivMod to streamline the related equivalence and introduces Nat.mkDivMod to a similar end.
---
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|
t-data |
67/70 |
Mathlib/Analysis/SpecialFunctions/Complex/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Logic/Equiv/Fin/Basic.lean,Mathlib/NumberTheory/Height/MvPolynomial.lean,Mathlib/Order/Partition/Equipartition.lean |
6 |
7 |
['JovanGerb', 'github-actions', 'mathlib-merge-conflicts', 'wrenna-robson'] |
eric-wieser assignee:eric-wieser |
2-53193 2 days ago |
2-55784 2 days ago |
107-29231 107 days |
0 |
| 44860 |
grunweg author:grunweg |
style: add missing newline between imports and module doc-string |
---
~~This is mandated by the new import style guide at https://github.com/leanprover-community/mathlib-landing/pull/13.~~ Actually, I'm not sure if this is true right now. But I think it should be true. Started a discussion in the reviewers stream.
---
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|
|
183/0 |
Mathlib/Algebra/BigOperators/Group/Finset/Gaps.lean,Mathlib/Algebra/Category/Grp/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/AB.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Homology/SingleHomology.lean,Mathlib/Algebra/NonAssoc/LieAdmissible/Defs.lean,Mathlib/Algebra/NonAssoc/PreLie/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/PUnit.lean,Mathlib/Algebra/Order/Sub/Basic.lean,Mathlib/Algebra/Order/Sub/Unbundled/Hom.lean,Mathlib/Algebra/Polynomial/Derivation.lean,Mathlib/Algebra/Polynomial/OfFn.lean,Mathlib/Algebra/SkewMonoidAlgebra/Single.lean,Mathlib/Algebra/SkewPolynomial/Basic.lean,Mathlib/Algebra/Star/MonoidHom.lean,Mathlib/AlgebraicGeometry/Birational/Dominant.lean,Mathlib/AlgebraicGeometry/Birational/RationalMap.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/EpiMono.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean,Mathlib/AlgebraicTopology/SimplicialNerve.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/CStarAlgebra/Unitization.lean,Mathlib/Analysis/Calculus/Deriv/AffineMap.lean,Mathlib/Analysis/Calculus/Deriv/MeanValue.lean,Mathlib/Analysis/Complex/Tietze.lean,Mathlib/Analysis/Convex/GaugeRescale.lean,Mathlib/Analysis/InnerProductSpace/Affine.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/LocallyConvex/Montel.lean,Mathlib/Analysis/Normed/Operator/Asymptotics.lean,Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/Basic.lean,Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/FunctorCategory.lean,Mathlib/CategoryTheory/Adjunction/Restrict.lean,Mathlib/CategoryTheory/Adjunction/Triple.lean,Mathlib/CategoryTheory/Adjunction/Unique.lean,Mathlib/CategoryTheory/ConcreteCategory/Forget.lean,Mathlib/CategoryTheory/EffectiveEpi/Basic.lean,Mathlib/CategoryTheory/EffectiveEpi/Comp.lean,Mathlib/CategoryTheory/EffectiveEpi/Coproduct.lean,Mathlib/CategoryTheory/EffectiveEpi/Enough.lean,Mathlib/CategoryTheory/EffectiveEpi/Extensive.lean,Mathlib/CategoryTheory/EffectiveEpi/Preserves.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Functor/Flat.lean,Mathlib/CategoryTheory/Functor/Quadrifunctor.lean,Mathlib/CategoryTheory/Functor/Trifunctor.lean,Mathlib/CategoryTheory/GradedObject/Bifunctor.lean,Mathlib/CategoryTheory/GradedObject/Braiding.lean,Mathlib/CategoryTheory/GradedObject/Trifunctor.lean,Mathlib/CategoryTheory/GradedObject/Unitor.lean,Mathlib/CategoryTheory/Groupoid/Discrete.lean,Mathlib/CategoryTheory/Limits/Final/ParallelPair.lean,Mathlib/CategoryTheory/Limits/Shapes/Countable.lean,Mathlib/CategoryTheory/Limits/Shapes/PiProd.lean,Mathlib/CategoryTheory/Limits/Shapes/SequentialProduct.lean,Mathlib/CategoryTheory/Limits/Sifted.lean,Mathlib/CategoryTheory/Monoidal/Braided/Reflection.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Cat.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorCategory/Complete.lean,Mathlib/CategoryTheory/Monoidal/Multifunctor.lean,Mathlib/CategoryTheory/MorphismProperty/TransfiniteComposition.lean,Mathlib/CategoryTheory/Preadditive/OfBiproducts.lean,Mathlib/CategoryTheory/Sites/CartesianClosed.lean,Mathlib/CategoryTheory/Sites/Coherent/Basic.lean,Mathlib/CategoryTheory/Sites/Coherent/CoherentSheaves.lean,Mathlib/CategoryTheory/Sites/Coherent/Comparison.lean,Mathlib/CategoryTheory/Sites/Coherent/Equivalence.lean,Mathlib/CategoryTheory/Sites/Coherent/ExtensiveColimits.lean,Mathlib/CategoryTheory/Sites/Coherent/ExtensiveSheaves.lean,Mathlib/CategoryTheory/Sites/Coherent/LocallySurjective.lean,Mathlib/CategoryTheory/Sites/Coherent/ReflectsPrecoherent.lean,Mathlib/CategoryTheory/Sites/Coherent/ReflectsPreregular.lean,Mathlib/CategoryTheory/Sites/Coherent/RegularSheaves.lean,Mathlib/CategoryTheory/Sites/Coherent/RegularTopology.lean,Mathlib/CategoryTheory/Sites/Coherent/SequentialLimit.lean,Mathlib/CategoryTheory/Sites/Coherent/SheafComparison.lean,Mathlib/CategoryTheory/Sites/ConstantSheaf.lean,Mathlib/CategoryTheory/Sites/CoverPreserving.lean,Mathlib/CategoryTheory/Sites/LocallySurjective.lean,Mathlib/CategoryTheory/Sites/PreservesLocallyBijective.lean,Mathlib/CategoryTheory/Sites/Sheafification.lean,Mathlib/CategoryTheory/Sites/Subcanonical.lean,Mathlib/Combinatorics/SimpleGraph/FiveWheelLike.lean,Mathlib/Condensed/AB.lean,Mathlib/Condensed/CartesianClosed.lean,Mathlib/Condensed/Discrete/Basic.lean,Mathlib/Condensed/Discrete/Characterization.lean,Mathlib/Condensed/Discrete/LocallyConstant.lean,Mathlib/Condensed/Discrete/Module.lean,Mathlib/Condensed/Epi.lean,Mathlib/Condensed/Equivalence.lean,Mathlib/Condensed/Explicit.lean,Mathlib/Condensed/Light/Basic.lean,Mathlib/Condensed/Light/Epi.lean,Mathlib/Condensed/Light/Explicit.lean,Mathlib/Condensed/Light/InternallyProjective.lean,Mathlib/Condensed/Light/Limits.lean |
183 |
3 |
['adomani', 'github-actions', 'grunweg'] |
nobody |
2-52223 2 days ago |
2-55943 2 days ago |
2-57187 2 days |
0 |
| 28013 |
astrainfinita author:astrainfinita |
feat: Lindemann-Weierstrass Theorem |
This PR continues the work from #6718.
--------
- [x] depends on: #18693
- [x] depends on: #29121
- [x] depends on: #36762
- [x] depends on: #37797
- [x] depends on: #37811
- [x] depends on: #39237
- [x] depends on: #39238
- [x] depends on: #42864
- [x] depends on: #43091
- [x] depends on: #43092
- [x] depends on: #43093
- [x] depends on: #43501
- [x] depends on: #43515 |
t-number-theory
large-import
|
637/9 |
Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Data/Finsupp/Quotient.lean,Mathlib/NumberTheory/Transcendental/Lindemann/AlgebraicPart.lean,Mathlib/NumberTheory/Transcendental/Lindemann/Basic.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,docs/100.yaml,docs/1000.yaml |
8 |
87 |
['astrainfinita', 'github-actions', 'grunweg', 'j-loreaux', 'jcommelin', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib-splicebot', 'mathlib4-merge-conflict-bot', 'ocfnash'] |
MichaelStollBayreuth assignee:MichaelStollBayreuth |
2-43010 2 days ago |
3-26346 3 days ago |
37-34335 37 days |
0 |
| 41289 |
D-Thomine author:D-Thomine |
feat(Dynamics): recurrents set and refactoring of conservative maps |
This PR deals mostly with `Dynamics.Conservative`. The notion of *recurrent set* is introduced: a set `s` is recurrent if almost every point in `s` returns to `s`. Most properties of conservative maps actually apply to recurrent sets.
The definition of conservative map is changed to align with this notion of recurrent set (a map is conservative if every measurable set is recurrent). Theorem `MeasureTheory.conservative_iff_exists_mem_iterate_mem` expresses the equivalence of the new definition with the older one.
---
<!-- Your PR title will become the first line of the commit message.
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|
t-dynamics |
337/114 |
Mathlib/Dynamics/Ergodic/Conservative.lean,Mathlib/Dynamics/Ergodic/MeasurePreserving.lean,Mathlib/MeasureTheory/Measure/QuasiMeasurePreserving.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/CountableInter.lean,Mathlib/Order/Interval/Finset/Basic.lean |
6 |
32 |
['D-Thomine', 'github-actions', 'mathlib-merge-conflicts', 'mcdoll'] |
sgouezel assignee:sgouezel |
2-42502 2 days ago |
2-45184 2 days ago |
87-1799 87 days |
0 |
| 42702 |
artie2000 author:artie2000 |
chore(Data/SetLike): rename `IsConcreteLE` |
* Rename `IsConcreteLE` to `IsMemLE`, as disccused at https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/More.20.60IsConcrete.60.20classes.20for.20.60SetLike.60/with/622616098
* Move several lemmas that ended up in the `IsConcreteLE` namespace after #42666 into the root namespace, making the names longer to disambiguate them:
* `IsConcreteLE.le_iff` to `le_iff_mem_imp_mem`
* `IsConcreteLE.not_le_iff_exists` to `not_le_iff_exists_mem_notMem`
* `IsConcreteLE.lt_iff_le_and_exists` to `lt_iff_le_and_exists_mem_notMem`
* `IsConcreteLE.exists_of_lt` to `exists_mem_notMem_of_lt`
---
<!-- Your PR title will become the first line of the commit message.
In this box, the text above the `---` (if not empty) will be appended
to the commit message, and can be used to give additional context or
details. Please leave a blank newline before the `---`, otherwise GitHub
will format the text above it as a title.
For details on the "pull request lifecycle" in mathlib, please see:
https://leanprover-community.github.io/contribute/index.html
In particular, note that most reviewers will only notice your PR
if it passes the continuous integration checks.
Please ask for help on https://leanprover.zulipchat.com if needed.
When merging, all the commits will be squashed into a single commit
listing all co-authors.
Co-authors in the squash commit are gathered from two sources:
First, all authors of commits to this PR branch are included. Thus,
one way to add co-authors is to include at least one commit authored by
each co-author among the commits in the pull request. If necessary, you
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git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
Second, co-authors can also be listed in lines at the very bottom of
the commit message (that is, directly before the `---`) using the following format:
Co-authored-by: Author Name <author@email.com>
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at the bottom of the commit message (before the `---`, and also before
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Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
- ...
Any other comments you want to keep out of the PR commit should go
below the `---`, and placed outside this HTML comment, or else they
will be invisible to reviewers.
If this PR depends on other PRs, please list them below this comment,
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[](https://gitpod.io/from-referrer/)
|
t-data |
218/215 |
Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/Support.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/Lie/Engel.lean,Mathlib/Algebra/Lie/LieTheorem.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/Submodule/Equiv.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/Algebra/Module/Torsion/PrimaryComponent.lean,Mathlib/Algebra/Pointwise/Stabilizer.lean,Mathlib/Algebra/Ring/NonZeroDivisors.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/AlgebraicGeometry/Sites/SmallAffineZariski.lean,Mathlib/AlgebraicTopology/SimplicialComplex/Basic.lean,Mathlib/Analysis/Calculus/TangentCone/Prod.lean,Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean,Mathlib/Basic/SetLike/Basic.lean,Mathlib/CategoryTheory/Groupoid/Subgroupoid.lean,Mathlib/CategoryTheory/Sites/Spaces.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/FieldTheory/Extension.lean,Mathlib/FieldTheory/Finite/Polynomial.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/PurelyInseparable/Basic.lean,Mathlib/FieldTheory/RatFunc/IntermediateField.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean,Mathlib/GroupTheory/FiniteAbelian/Basic.lean,Mathlib/GroupTheory/FiniteAbelian/Duality.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/Perm/MaximalSubgroups.lean,Mathlib/GroupTheory/SpecificGroups/Alternating/Centralizer.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/GroupTheory/SpecificGroups/ZGroup.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Basic.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/LinearAlgebra/Basis/VectorSpace.lean,Mathlib/LinearAlgebra/Dual/Defs.lean,Mathlib/LinearAlgebra/Finsupp/Span.lean,Mathlib/LinearAlgebra/Finsupp/Supported.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/LinearAlgebra/Prod.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/Projectivization/Subspace.lean,Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/NumberTheory/ModularForms/Cusps.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Galois.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Atoms.lean,Mathlib/Order/PFilter.lean,Mathlib/Order/Sublattice.lean,Mathlib/RepresentationTheory/Stabilizer.lean,Mathlib/RingTheory/Conductor.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Factorization.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Basic.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/PID.lean,Mathlib/RingTheory/Extension/Cotangent/Basis.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Finiteness.lean,Mathlib/RingTheory/Ideal/GoingUp.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Colon.lean,Mathlib/RingTheory/Ideal/NatInt.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/IntegralClosure/IntegrallyClosed.lean,Mathlib/RingTheory/Invariant/Basic.lean,Mathlib/RingTheory/KrullDimension/Zero.lean,Mathlib/RingTheory/Lasker.lean,Mathlib/RingTheory/LittleWedderburn.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/MvPolynomial/Ideal.lean,Mathlib/RingTheory/Nilpotent/Lemmas.lean,Mathlib/RingTheory/Polynomial/UniversalFactorizationRing.lean,Mathlib/RingTheory/SimpleModule/Isotypic.lean,Mathlib/RingTheory/SimpleRing/Basic.lean,Mathlib/RingTheory/Smooth/NoetherianDescent.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/RingTheory/Support.lean,Mathlib/RingTheory/TwoSidedIdeal/Operations.lean |
105 |
14 |
['artie2000', 'github-actions', 'martinwintermath', 'mathlib-merge-conflicts'] |
nobody |
2-36508 2 days ago |
2-40555 2 days ago |
17-36014 17 days |
4 |
| 44756 |
mycaule author:mycaule |
feat(Algebra/Polynomial/RingDivision): polynomials coprime to `X - C a` |
Add to `Mathlib/Algebra/Polynomial/RingDivision.lean`, over a commutative ring:
`Polynomial.isCoprime_X_sub_C_iff`: `IsCoprime (X - C a) p ↔ IsUnit (p.eval a)`
`Polynomial.isCoprime_X_sub_C_iff_isUnit_sub`: `IsCoprime (X - C a) (X - C b) ↔ IsUnit (a - b)`; it replaces `isCoprime_X_sub_C_of_isUnit_sub`, which becomes a deprecated alias (its two uses in Mathlib are updated)
`Polynomial.isCoprime_X_iff`: `IsCoprime X p ↔ IsUnit (p.coeff 0)`
For the converse direction of the first lemma, evaluate a Bézout relation at `a`. For the direct one, write `p = (X - C a) * q + C (p.eval a)` (`X_sub_C_dvd_sub_C_eval`). Mathlib had `isCoprime_X_sub_C_of_isUnit_sub` (the case `p = X - C b`, one direction only) but not the general criterion.
AI disclosure: the Lean proof was written by an AI model (Claude, Anthropic) under my direction. I have read and checked it and will handle the review.
|
t-algebra
new-contributor
LLM-generated
label:t-algebra$ |
20/10 |
Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/Analysis/Complex/Polynomial/Basic.lean |
2 |
20 |
['github-actions', 'mycaule', 'themathqueen', 'vihdzp'] |
nobody |
2-33053 2 days ago |
2-34221 2 days ago |
5-38813 5 days |
0 |
| 44831 |
scottdhughes author:scottdhughes |
feat(Analysis/MeanInequalitiesPow): add a real power difference bound |
Add `Real.abs_rpow_sub_rpow_le` in `Mathlib/Analysis/MeanInequalitiesPow.lean`: for nonnegative real bases and `0 ≤ p ≤ 1`,
```lean
|a ^ p - b ^ p| ≤ |a - b| ^ p
```
Provide a direct scalar API for downstream fractional-power regularity estimates. Derive the bound from the neighboring `Real.rpow_add_le_add_rpow`, then handle the two input orders. Include both exponent endpoints. Add one lemma and its docstring, with no new imports.
---
Local validation on Lean/Mathlib 4.35.0:
- `lake build Mathlib.Analysis.MeanInequalitiesPow`
- `lake exe lint-style Mathlib.Analysis.MeanInequalitiesPow`
- Fresh source elaboration, exported-type and axiom checks, plus all 15 default declaration linters for the new lemma.
The axiom check reports only `propext`, `Classical.choice` and `Quot.sound`.
AI assistance: Codex adapted an existing downstream proof, searched Mathlib and relevant open PRs, drafted this description, and ran the local checks.
|
t-analysis
new-contributor
LLM-generated
|
19/0 |
Mathlib/Analysis/MeanInequalitiesPow.lean |
1 |
3 |
['copilot-pull-request-reviewer', 'github-actions', 'scottdhughes'] |
nobody |
2-30716 2 days ago |
3-33880 3 days ago |
3-33873 3 days |
0 |
| 44730 |
mycaule author:mycaule |
feat(Analysis/Real/OfDigits): rationals have eventually periodic digits |
Characterise rational numbers by their positional expansion, using the existing `Real.digits` / `Real.ofDigits` API:
* `Real.digits_ratCast_eventually_periodic`: for `q : ℚ` with `0 ≤ q`, there are `N` and `p > 0` with `digits q b (n + p) = digits q b n` for all `n ≥ N`.
* `Real.exists_ratCast_eq_ofDigits_of_eventually_periodic`: if `1 < b` and a digit sequence `a : ℕ → Fin b` is eventually periodic, then `ofDigits a` is rational.
* `Real.exists_ratCast_eq_iff_digits_eventually_periodic`: for `x ∈ [0, 1)` and `1 < b`, `x` is rational iff its digits are eventually periodic.
Proof sketch. For `x = r / s`, the `n`-th digit equals `(r * b ^ n % s) * b / s`, so it only depends on the remainder `r * b ^ n % s`; these remainders live in `Fin s`, hence repeat by pigeonhole, and from then on the sequence is periodic. Conversely, splitting `ofDigits` after `N` digits (`ofDigits_eq_sum_add_ofDigits`), the purely periodic tail `y` satisfies `y = S + b⁻ᵖ y` with `S` a finite rational sum, so `y = S / (1 - b⁻ᵖ)`.
"Eventually periodic" is spelled out as `∃ N p, 0 < p ∧ ∀ n ≥ N, …`; I'm happy to switch to an existing predicate if reviewers prefer one. Adds a (private) import of `Mathlib.Algebra.Order.Floor.Semifield` for `Nat.floor_div_eq_div`.
AI disclosure: the statements and proofs were drafted with Claude (Claude Code) and checked by compiling against Mathlib; I have reviewed them.
---
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
new-contributor
t-analysis
LLM-generated
|
101/0 |
Mathlib/Analysis/Real/OfDigits.lean,Mathlib/Data/Nat/Init.lean |
2 |
18 |
['github-actions', 'mycaule', 'themathqueen', 'vihdzp'] |
nobody |
2-28890 2 days ago |
2-28890 2 days ago |
5-2306 5 days |
0 |
| 42693 |
justin-palumbo author:justin-palumbo |
feat(Topology/MetricSpace): a Gδ subset of a Polish space is Polish |
Adds `IsGδ.polishSpace`: a Gδ subset of a Polish space is Polish, which strengthens the existing IsOpen.polishSpace.
The proof follows the outline in Anush Tserunyan's descriptive set theory notes, https://www.math.mcgill.ca/atserunyan/Teaching_notes/dst_lectures.pdf where it is attributed to A. Bernshteyn. The "usual" approach (as in Kechris's Classical Descriptive Set Theory) constructs a complete compatible metric (the "Alexandrov metric"). The approach taken here is snappier to formalize - the idea is to give a closed embeddding from the G\delta set into another Polish space, and appeal to the fact closed subsets of Polish spaces are Polish. [Note the Alexandrov metric is recoverable from the embedding via the induced complete metrics on the product topology.]
---
Question: `IsOpen.polishSpace` could now be proven directly from`isGδ.polishSpace`, and `CompleteCopy` completely retired. That feels cleaner to me, given `CompleteCopy` has had no users since it was ported along with everything else in 2023: #3357. The main argument for keeping is that leveraging `CompleteCopy` is slightly more explicit in proving that open subsets are Polish. Happy to remove in a follow-up, in this PR, or not at all :)
(Update: For now, marking as deprecated based on suggestion from @j-loreaux )
LLM usage disclaimer: I wrote an original local version of this PR myself, and then used Claude Opus to double-check / simplify / help me pull out names of relevant theorems from mathlib. The primary non-trivial contribution from LLM was idea of leveraging isClosed_eq (ie proving closure of range by framing the range of the embedding as a countable intersection of pairs satisfying closed equations). I take full responsibility for the code here |
new-contributor
t-topology
|
94/14 |
Mathlib/Topology/MetricSpace/Polish.lean |
1 |
21 |
['felixpernegger', 'github-actions', 'j-loreaux', 'justin-palumbo'] |
j-loreaux assignee:j-loreaux |
2-26940 2 days ago |
2-26958 2 days ago |
64-26731 64 days |
0 |
| 26479 |
thefundamentaltheor3m author:thefundamentaltheor3m |
feat(Analysis/Complex/CauchyIntegral): Cauchy–Goursat for Unbounded Rectangles |
In this PR, we prove versions of the Cauchy-Goursat theorem where the contours in question are rectangular and unbounded (ie, where the contours look like the $\bigsqcup$ symbol). I am not sure if I have formalised these in the best way, or if `Analysis.Complex.CauchyIntegral` is the best place for them (it might be prudent to reorganise the file into multiple files at some point), but I believe this is a useful result. Suggestions welcome.
---
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|
new-contributor
t-analysis
sphere-packing
maintainer-merge
|
169/0 |
Mathlib/Analysis/Complex/CauchyIntegral.lean |
1 |
53 |
['github-actions', 'j-loreaux', 'loefflerd', 'mathlib-splicebot', 'mathlib4-merge-conflict-bot', 'ocfnash', 'thefundamentaltheor3m', 'themathqueen', 'wwylele'] |
j-loreaux assignee:j-loreaux |
2-26875 2 days ago |
16-6821 16 days ago |
143-86120 143 days |
0 |
| 44867 |
Parcly-Taxel author:Parcly-Taxel |
feat: add some OEIS tags |
Following #44368. |
t-combinatorics |
10/1 |
Mathlib/Combinatorics/Derangements/Finite.lean,Mathlib/Combinatorics/Enumerative/Bell.lean,Mathlib/Combinatorics/Enumerative/Catalan/Basic.lean,Mathlib/Combinatorics/Enumerative/Pentagonal/Basic.lean,Mathlib/Combinatorics/Enumerative/Schroder.lean,Mathlib/Combinatorics/Enumerative/Stirling.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Nat/Fib/Basic.lean |
8 |
2 |
['SnirBroshi', 'github-actions'] |
nobody |
2-26541 2 days ago |
2-39220 2 days ago |
2-39213 2 days |
0 |
| 32294 |
jsm28 author:jsm28 |
feat(Geometry/Euclidean/Angle/Incenter): distance from second intersection with circumcircle |
Add the following lemma: given a triangle ABC, suppose an angle bisector from A through the incenter or excenter I meets the circumcircle again at X (including the case of an external bisector at A tangent to the circle, in which case X = A). Then XB = XI (= XC, by applying this lemma again). This is a standard configuration: https://en.wikipedia.org/wiki/Incenter%E2%80%93excenter_lemma
---
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- [x] depends on: #30981
- [x] depends on: #30982
- [x] depends on: #32019
- [x] depends on: #32021
- [x] depends on: #32023
- [x] depends on: #32270
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[](https://gitpod.io/from-referrer/)
|
t-euclidean-geometry
maintainer-merge
|
181/1 |
Mathlib/Geometry/Euclidean/Angle/Incenter.lean |
1 |
27 |
['YaelDillies', 'felixpernegger', 'github-actions', 'jsm28', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'peakpoint'] |
nobody |
2-23142 2 days ago |
4-56430 4 days ago |
202-2432 202 days |
1 |
| 42587 |
joelriou author:joelriou |
feat(AlgebraicTopology/SimplicialSet): the fundamental groupoid, as a pseudofunctor |
The main definition in this PR is the pseudofunctor `SSet.FundamentalGroupoid.pseudofunctor : LocallyDiscrete SSet.{u} ⥤ᵖ Cat.{u, u}` which sends a simplicial set to its fundamental groupoid.
---
- [x] depends on: #42576
- [x] depends on: #42523
- [x] depends on: #42528
- [x] depends on: #42529
- [x] depends on: #42527
- [x] depends on: #42526
<!-- Your PR title will become the first line of the commit message.
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|
t-algebraic-topology |
106/2 |
Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/FundamentalGroupoid/Pseudofunctor.lean |
3 |
5 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
2-22526 2 days ago |
2-23174 2 days ago |
2-23168 2 days |
0 |
| 44872 |
Fieldnote-Echo author:Fieldnote-Echo |
feat(Combinatorics/SimpleGraph/Metric): add distance lemmas for graph maps |
Graph homomorphisms map walks to walks of the same length, so they do not increase extended graph distance. For natural-valued distance, the corresponding bound requires source reachability because unreachable pairs use the junk value `0`.
Add:
- `SimpleGraph.Hom.edist_le`
- `SimpleGraph.Iso.edist_eq`
- `SimpleGraph.Hom.dist_le`
- `SimpleGraph.Iso.dist_eq`
Mark both isomorphism equalities as `@[simp]`. Refactor the existing distance-antitonicity results for graph inclusions through `Hom.ofLE`, making them special cases of the homomorphism bounds.
Discussed on Zulip: [distance and balls under graph maps](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/distance.20and.20balls.20under.20graph.20maps/with/631709959).
---
AI assistance: Codex helped search the local API, adapt proofs, and run local checks. The design decisions and mathematical motivations were mine. I reviewed and understand the statements and final implementation.
|
t-combinatorics
new-contributor
LLM-generated
maintainer-merge
|
23/13 |
Mathlib/Combinatorics/SimpleGraph/Metric.lean |
1 |
14 |
['Fieldnote-Echo', 'SnirBroshi', 'github-actions'] |
nobody |
2-17657 2 days ago |
2-19354 2 days ago |
2-22880 2 days |
0 |
| 44537 |
vincentqb author:vincentqb |
feat(Analysis/Convex/Cone): prove that open sets have open hulls |
This PR proves `ConvexCone.isOpen_hull`: if addition and multiplication by each fixed scalar are continuous, the convex cone hull of an open set is open. It defines `ConvexCone.interior`, with coercion, membership, and equality lemmas parallel to the closure API. The hull theorem then follows from cone minimality.
The original hypotheses do not suffice, see #44689 for a counterexample.
---
AI-assisted contribution.
|
t-analysis
LLM-generated
new-contributor
file-removed
|
57/24 |
Mathlib.lean,Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Analysis/Convex/Cone/Interior.lean,Wanted.lean,Wanted/Analysis/Convex/Cone/Basic.lean |
5 |
15 |
['github-actions', 'pepamontero', 'vincentqb'] |
nobody |
2-11751 2 days ago |
6-85351 6 days ago |
10-12219 10 days |
0 |
| 44854 |
vihdzp author:vihdzp |
feat: generalize `not_strictAnti_of_wellFoundedLT` |
We prove versions where the domain is any ordered type without maximums/minimums.
---
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|
t-order
maintainer-merge
|
13/8 |
Mathlib/Order/OrderIsoNat.lean |
1 |
9 |
['SnirBroshi', 'github-actions', 'vihdzp'] |
nobody |
2-7368 2 days ago |
2-63219 2 days ago |
2-63318 2 days |
0 |
| 44881 |
bryangingechen author:bryangingechen |
ci: run `lake update` in a job without credentials |
This PR splits `update_dependencies.yml` into 3 jobs.
First, it moves `lake update` into a job without credentials. This is needed because `lake update` runs code from the new dependency revisions (their lakefiles and any `post_update` hooks) before anyone has reviewed them. The job that runs it now has only `contents: read`, no secrets, and no persisted git credentials. It uploads `lake-manifest.json` and `lean-toolchain` as an artifact.
A second job, `update-pr`, does everything that needs the app token: bumping the `mathlib-ci` pin, working out the PR state, and creating or updating the PR. It doesn't run any code from the dependencies. From the artifact it takes only those two files and checks that the manifest is well formed. It then accepts only revision changes: every other field must match master's manifest, except that a transitive package's `inputRev` may change along with its parent's manifest. If an upstream change legitimately does more, such as adding a dependency or moving a repository, the run fails with the difference in its log, and that update has to be done by hand. `create-pull-request` now gets `add-paths`, so the PR only ever changes `lake-manifest.json` and the `mathlib-ci` pin.
The third and final job contains the Zulip failure message and it runs when either of the other jobs fails.
One behavior change: `lake update` now also runs while the PR is labelled `ready-to-merge`. Its result is discarded, since nothing is pushed in that state.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---
Every bot update among the last 40 changes to `lake-manifest.json` passes the new checks in "Apply the updated manifest and toolchain".
Testing: a copy of the workflow ran in a private test repository, with `GITHUB_TOKEN` in place of the app token and an echo in place of the Zulip message. It covered:
- creating the PR;
- a run with nothing to do;
- updating a stale branch;
- skipping while `ready-to-merge`;
- a toolchain change;
- a failure in either job;
- manifests that `update-pr` must refuse.
|
CI
LLM-generated
|
89/12 |
.github/workflows/update_dependencies.yml,docs/workflows.md |
2 |
1 |
['github-actions'] |
nobody |
2-6780 2 days ago |
2-8154 2 days ago |
2-8147 2 days |
0 |
| 41373 |
SnirBroshi author:SnirBroshi |
feat(SimpleGraph): some `CliqueFree`/`Free` lemmas |
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics |
25/0 |
Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean |
2 |
4 |
['SnirBroshi', 'gdahia', 'github-actions'] |
b-mehta assignee:b-mehta |
2-6103 2 days ago |
104-12237 104 days ago |
104-12230 104 days |
1 |
| 43040 |
Qinghev author:Qinghev |
feat(Analysis/Convex): add center mass residual identity |
This adds `Finset.sum_smul_sub_centerMass_eq_zero`, stating that the weighted sum of displacements from a finite center of mass is zero whenever the total weight is nonzero.
---
Codex assisted with drafting and verification. |
t-analysis
new-contributor
|
5/0 |
Mathlib/Analysis/Convex/Combination.lean |
1 |
2 |
['github-actions'] |
ADedecker assignee:ADedecker |
2-6101 2 days ago |
55-68610 55 days ago |
55-68603 55 days |
0 |
| 43046 |
teorth author:teorth |
feat(Analysis/Distribution): compactly supported functions are dense in Schwartz space |
This file adds `SchwartzMap.dense_hasCompactSupport`: the compactly supported
Schwartz functions are dense in `𝓢(E, F)` (for `E` a finite-dimensional real
normed space).
The proof goes through smooth truncation, and some API for such truncations is provided.
----
This material will be used in a forthcoming PR on the prime number theorem.
AI was used to generate initial code, which was then heavily golfed and reviewed by the author. |
t-analysis |
191/0 |
Mathlib.lean,Mathlib/Analysis/Distribution/SchwartzSpace/CompactSupport.lean |
2 |
14 |
['github-actions', 'mathlib-splicebot', 'mcdoll', 'ocfnash', 'teorth'] |
j-loreaux assignee:j-loreaux |
2-6100 2 days ago |
38-7319 38 days ago |
54-62554 54 days |
2 |
| 43358 |
EtienneC30 author:EtienneC30 |
feat: strong measurability of a path-valued random variable |
If `X` is a right-continuous strongly adapted stochastic process, then it is strongly measurable when seen as a path-valued random variable.
---
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- [x] depends on: #43352
- [x] depends on: #43525
Co-authored-by: @RemyDegenne
[](https://gitpod.io/from-referrer/)
|
brownian
t-measure-probability
|
214/0 |
Mathlib.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/Probability/Process/StronglyMeasurablePath.lean,Mathlib/Topology/NhdsWithin.lean |
4 |
4 |
['github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
RemyDegenne assignee:RemyDegenne |
2-6099 2 days ago |
11-57273 11 days ago |
17-61340 17 days |
1 |
| 44408 |
SnirBroshi author:SnirBroshi |
feat(SetTheory/Cardinal/Finite): simp lemmas for `[E]Nat.card` |
- `ENat.toNat (ENat.card α) = Nat.card α`
- `Cardinal.toNat (Cardinal.mk α) = Nat.card α`
- `Cardinal.toENat (Cardinal.mk α) = ENat.card α`
---
This lets `simp` prove `toENat_cardinalMk`, so it has been untagged.
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|
t-data |
33/14 |
Mathlib/Algebra/Group/Pointwise/Set/Card.lean,Mathlib/Data/Set/Card.lean,Mathlib/Data/Sym/Sym2/Card.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/SetTheory/Cardinal/Finite.lean |
5 |
1 |
['github-actions'] |
TwoFX assignee:TwoFX |
2-6097 2 days ago |
15-9 15 days ago |
15-1172 15 days |
0 |
| 41206 |
Ljon4ik4 author:Ljon4ik4 |
feat: strict Lie-Rinehart ideals and Quotients by them |
In this PR strict ideals in the context of Lie-Rinehart algebras are defined and it is shown that quotients by them are again Lie-Rinehart algebras.
## Context on Lie-Rinehart algebras
A Lie-Rinehart algebra is given by a couple of an `R`-algebra `A` and an `R`-Lie-Algebra `L` acting on each other and satisfying certain compatibility conditions. The most important example of Lie-Rinehart algebras in geometry is given by `A`=smooth functions on a smooth manifold, and `L`= vector fields on the manifold. Many important geometric constructions (differential forms, Cartan calculus) are defined naturally in terms of Lie-Rinehart algebras.
## Relevance of the construction
This construction of quotients by ideals will be important to define the Basechange of Lie-Rineahart algebras, which in turn is necessary to define 'comorphisms'. Comorphisms are the right notion of morphism to do geometry (e.g. a smooth map between two manifolds corresponds to a comorphism of their associated Lie-Rinehart algebras).
## Strictness
The ideals here are called strict, because it is assumed that `A` remains untouched and one only considers a subobject of `L`. There seems to be constructions for non-strict ideals, but the definitions are more complicated:
https://www.uni-math.gwdg.de/mjotz/JotzLean18c.pdf
https://arxiv.org/pdf/1706.07084
## Changes made
The files `StrictIdeal.lean` and `Quotient.lean` are new, containing the definition of the ideals and the fact that quotients are again Lie-Rinehart algebras. The `Subalgebra.lean` was mildly changed, since it seemed strange to have `comap` and `ker` without having `map` and `range`.
## Disclosure of AI use
All code is hand-written, I used claude interpret debug messages and search for lemmas.
I think most notably the following patterns were proposed by claude:
* `mul_smul := by rintro r₁ r₂ ⟨x⟩; exact congrArg mk (mul_smul r₁ r₂ x)` to show that things are well-defined on the quotient.
* `change f.toLinearMap' ⁅x, y⁆ ∈ s₂` in the proof in `comap`. (I had a simp there, which had as a result `f.toLinearMap' ⁅x, y⁆ ∈ s₂`, but somehow the subsequent steps did not work then)
## Questions open
* I am not sure if strict is a good prefix, and am happy to change it to something else.
(Also, one could even argue that the subalgebras, as defined currently, should be called strict, too...)
* In the definition of `mk'` the `toFun` field seems obsolete to me, but somehow if I remove it I get an error in one of the lemmas after it.
* I am not sure I fully understand the 'per-definition' expose rules. When I first committed I got some errors so I made two defs exposed, but I am not sure that is the correct way to go.
---
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|
t-algebra label:t-algebra$ |
442/0 |
Mathlib.lean,Mathlib/Algebra/LieRinehartAlgebra/Quotient.lean,Mathlib/Algebra/LieRinehartAlgebra/StrictIdeal.lean,Mathlib/Algebra/LieRinehartAlgebra/Subalgebra.lean |
4 |
1 |
['github-actions'] |
nobody |
2-5198 2 days ago |
89-33797 89 days ago |
108-28195 108 days |
0 |
| 42995 |
jacob-greenfield author:jacob-greenfield |
feat: add `List.Pairwise.orderedInsert'`, `List.sortedLE_orderedInsert_lt`, and `List.sortedGE_orderedInsert_gt` |
Introduce a generalized `Pairwise.orderedInsert'` lemma to prove that `Pairwise r l` is maintained after performing an `orderedInsert` using a relation stronger than `r` under certain conditions. Prove `sortedLE_orderedInsert_lt`, showing that `l.orderedInsert (· < ·) a` preserves `SortedLE` for decidable total preorders (analogously for `sortedGE_orderedInsert_gt`). This is useful for inserting an element into a sorted list *behind* any other elements which compare equal.
---
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I was hoping to avoid `omit`, but that would require moving all of `Pairwise.orderedInsert'`, `Pairwise.orderedInsert`, `pairwise_insertionSort`, `sublist_insertionSort'`, `pair_sublist_insertionSort'`, and `mergeSort_eq_insertionSort` after `end sort` on line 365 and reintroducing all the section variables. I also considered moving `Pairwise.orderedInsert'` somewhere _before_ `variable {α β : Type*} (r : α → α → Prop) (s : β → β → Prop)` on line 30, but that would place it before `orderedInsert` is defined. "Omit" seemed like the least invasive approach.
[](https://gitpod.io/from-referrer/)
|
t-data
new-contributor
|
27/11 |
Mathlib/Data/List/Sort.lean |
1 |
8 |
['github-actions', 'jacob-greenfield', 'theebayuser'] |
nobody |
2-5196 2 days ago |
56-82863 56 days ago |
56-82856 56 days |
0 |
| 44102 |
wwylele author:wwylele |
feat(Geometry/Euclidean): dist with affineCombination on one side |
Supplementing existing theorems about `dist affineCombination affineCombination`, this one calculates `dist affineCombination Q` with `affineCombination` only on one side.
I intentionally did not follow the existing style in the file, and wrote `x ^ 2` instead of `x * x`. The latter results in unnecessary duplication and is not `ring`-normal form. The `x * x` style seems to appear a lot in old Euclidean geometry code. We should refactor them but that can be later.
---
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|
t-euclidean-geometry
maintainer-merge
|
30/0 |
Mathlib/Geometry/Euclidean/Basic.lean |
1 |
3 |
['github-actions', 'jsm28'] |
nobody |
2-5194 2 days ago |
24-6261 24 days ago |
24-6254 24 days |
2 |
| 43281 |
keyframe41 author:keyframe41 |
feat(NumberTheory/DiophantineApproximation): prove Hurwitz's approximation theorem |
Prove **Hurwitz's approximation theorem**: for irrational `ξ`, the set of rationals `q` with `|ξ - q| < 1 / (√5 * q.den ^ 2)` is infinite.
This strengthens `Real.infinite_rat_abs_sub_lt_one_div_den_sq_of_irrational` from`Mathlib/NumberTheory/DiophantineApproximation/Basic.lean`, which gives the same statement with constant `1` instead of `√5`. The constant `√5` is optimal, though the sharpness (using the golden ratio) is not included here.
The proof avoids continued fractions and opts for Farey brackets (quadruples `p/q < ξ < r/s` with `q * r - p * s = 1`) packaged as `Real.Hurwitz.IsFarey`. It uses the fact that at least one of `p/q`, `r/s`, and the mediant `(p + r)/(q + s)` satisfies the bound, as if not, we can contradict the irrationality of `√5`. By creating brackets of arbitrarily small width, infinitude follows by the same argument as in `Basic.lean`.
Some design choices:
* No `GenContFract` to avoid continued fractions/recursive sequences. This also follows the spirit of `Basic.lean`, which defines its own `Real.convergent` rather than building Legendre's theorem on `GenContFract.convs`.
* `Real.Hurwitz` namespace. Mirrors `Real.ContfracLegendre` in `Basic.lean` by putting the main result in `Real` and the technical material in a secondary namespace.
* `IsGoodApprox` is stated without division ** as `|y * ξ - x| * y * √5 < 1` for easier manipulation and linked to the quotient form in the actual theorem using `Real.Hurwitz.isGoodApprox_div_bound`.
---
I used Claude which suggested the overall strategy/lemmas and reviewed naming and documentation against the mathlib conventions. All proofs are my own. As a first-time contributor, AI was also used to help in learning Lean.
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[](https://gitpod.io/from-referrer/)
|
t-number-theory
new-contributor
|
359/0 |
Mathlib.lean,Mathlib/NumberTheory/DiophantineApproximation/Hurwitz.lean |
2 |
11 |
['SnirBroshi', 'github-actions'] |
nobody |
2-5193 2 days ago |
45-69915 45 days ago |
45-71107 45 days |
0 |
| 44882 |
bryangingechen author:bryangingechen |
ci: show the dependency changes in the update-dependencies Zulip messages |
This PR fixes `update_dependencies_zulip.yml` so that its Zulip messages list the dependency changes, as #23274 intended. Three things kept that from working:
- "Parse dependency changes" printed `${message}`, which is never set, instead of the script's output, and didn't write to `$GITHUB_OUTPUT` (since #23659). So the list was always empty.
- Under `workflow_run`, `actions/checkout` checks out master's latest commit rather than the commit CI ran on, so the script compared master with its parent and reported "No dependency versions were changed". The checkout now uses `github.event.workflow_run.head_sha`. The bot's commit sits directly on master, so the script's `HEAD~1..HEAD` is exactly the update.
- The list was pasted into the github-script source inside a string literal, which can't hold its line breaks, so fixing the first two alone would have broken both messages. It is now passed in through an environment variable.
It also drops the GitHub App token from this workflow. The token was there to remove the `auto-merge-after-CI` label, and #43913 removed that call. Since then the failure job used it only to look up each PR's URL, which is now built from the repository URL, and the success job didn't use it at all. Both jobs now have only `contents: read`, without `id-token: write`, and the checkout no longer persists git credentials.
Smaller fixes: the success message said "merged via #N", but since #43913 the PR waits for review, so it now says that. `monitor-success` gets the same `github.repository` guard as `monitor-failures`. The `docs/workflows.md` entry no longer mentions label handling.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---
Testing:
- Locally, the new "Parse dependency changes" step and both message scripts, run on the bot's commit `dee624cf361` (then the head of #44874): the output lists the 8 updated packages, and neither script calls the API. With only the first fix, both scripts fail with a `SyntaxError`.
- In a private test repository: a copy of the workflow with the Zulip step replaced by an echo, triggered by a stub "continuous integration" workflow on the bot branch. A failing and a passing CI run each produced the expected message, with the PR link and the dependency changes, from a checkout of the bot's commit.
|
CI
LLM-generated
|
18/42 |
.github/workflows/update_dependencies_zulip.yml,docs/workflows.md |
2 |
1 |
['github-actions'] |
nobody |
2-3804 2 days ago |
2-4307 2 days ago |
2-4300 2 days |
0 |
| 44846 |
artie2000 author:artie2000 |
feat(Algebra/Polynomial): variants of Polynomial.reverse functional equation |
Split from https://github.com/leanprover-community/mathlib4/pull/44338 - these were helper lemmas for a discarded approach.
AI usage disclosure: ChatGPT 5.5 was used to split this PR from https://github.com/leanprover-community/mathlib4/pull/44338. All of the changes in this PR were made by a human.
---
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|
t-algebra label:t-algebra$ |
25/9 |
Mathlib/Algebra/Polynomial/Reverse.lean |
1 |
9 |
['SnirBroshi', 'artie2000', 'github-actions'] |
nobody |
2-3500 2 days ago |
2-5233 2 days ago |
2-46664 2 days |
0 |
| 42316 |
JovanGerb author:JovanGerb |
feat: use `max`/`min` for `union`/`intersection` in `Set`, `Finset`, `ZFSet`, `Class` |
This lets us write `∪`/`∩` for sets while the underlying constant is `max`/`min`. This is a follow-up to #32983, which made the same change for `⊆`, `⊂`, `⊇` and `⊃`. The implementation for `∪`/`∩` is analogous.
The first commit contains the implementation change, and all other commits are just adaptations.
Note that there are now two different special delaborators for `max`/`min`, because we already had the delaborator that chooses between `max`/`min` and `⊔`/`⊓`. It is important that the one for `∪`/`∩` is tried first. There is no priority mechanism for delaborators: they are always executed newest to oldest. So, this PR adds a (redundant) import to ensure that this order is respected.
- I modified the delaborator for `⊔`/`⊓` so that it doesn't fire if `LinearOrder` isn't imported. Due to the extra redundant import, that is now a more common situation and I think in that situation it's better to print `max a b` instead of `a ⊔ b`.
- It is now not anymore possible to write `simp [(· ∪ ·)]` due to elaboration issues. The same also already applied to `simp [(· ⊆ ·)]`.
- Many `simp` calls had to be fixed because the `simp` set for `max`/`min` contains more lemmas than what we had for `union`/`inter`. For example, `compl_inf` and `inf_of_le_left`/`inf_of_le_right` now also apply to intersections.
- In particular `inf_of_le_left`/`inf_of_le_right` are quite slow simp lemmas, which means that this PR gives a bit of slowdown.
- A `grind` call had to be fixed because it timed out. Originally, that `grind` call was already doing too much stuff, but it didn't quite reach its limits.
- Many `@[simp]` and some `@[gcongr]` tags could be removed because they are now subsumed by more general tags.
- I removed `@[mfld_simp]` from `inter_subset_left`, as it seemed a bit weird to have it there and not on its dual or its mirror lemma.
---
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[](https://gitpod.io/from-referrer/)
|
tech debt
large-import
t-data
|
348/431 |
Archive/Examples/Kuratowski.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/Lie/Basis/Prod.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/AlgebraicGeometry/Morphisms/UniversallyClosed.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/AlgebraicGeometry/ZariskisMainTheorem.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/RelativeCellComplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/Analysis/Complex/ValueDistribution/LogCounting/Basic.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean,Mathlib/Analysis/Normed/Module/Seminorm/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/NegMulLog.lean,Mathlib/CategoryTheory/Limits/Types/Pushouts.lean,Mathlib/Combinatorics/Additive/Dissociation.lean,Mathlib/Combinatorics/Matroid/Basic.lean,Mathlib/Combinatorics/Matroid/Minor/Contract.lean,Mathlib/Combinatorics/Matroid/Minor/Order.lean,Mathlib/Combinatorics/SetFamily/Compression/UV.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LineGraph.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.lean,Mathlib/Combinatorics/SimpleGraph/UniversalVerts.lean,Mathlib/Computability/TuringMachine/ToPartrec.lean,Mathlib/Data/Finmap.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/BooleanAlgebra.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finset/Lattice/Lemmas.lean,Mathlib/Data/Finset/SDiff.lean,Mathlib/Data/Finset/Sups.lean,Mathlib/Data/Finset/SymmDiff.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/Multiset/UnionInter.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Defs.lean,Mathlib/Data/Set/Disjoint.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/Subset.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/MFDeriv/Defs.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/GroupTheory/Perm/Finite.lean,Mathlib/GroupTheory/Perm/Support.lean,Mathlib/LinearAlgebra/Basis/Exact.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/Logic/Equiv/Set.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Covering/LiminfLimsup.lean,Mathlib/MeasureTheory/MeasurableSpace/CountablyGenerated.lean,Mathlib/MeasureTheory/Measure/Basic.lean,Mathlib/MeasureTheory/Measure/Decomposition/Hahn.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean,Mathlib/MeasureTheory/Measure/Typeclasses/ZeroOne.lean,Mathlib/MeasureTheory/OuterMeasure/AE.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/MeasureTheory/SetSemiring.lean,Mathlib/MeasureTheory/VectorMeasure/TotalVariation.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Semivariation.lean,Mathlib/NumberTheory/LSeries/ZetaZeros.lean,Mathlib/NumberTheory/WellApproximable.lean,Mathlib/Order/Birkhoff.lean,Mathlib/Order/BooleanAlgebra/Set.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/Defs/Lattice.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Filter/Bases/Basic.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Defs.lean,Mathlib/Order/Lattice/Congruence.lean,Mathlib/Order/Notation.lean,Mathlib/Order/SupIndep.lean,Mathlib/RingTheory/PolynomialLaw/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Polynomial.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Class.lean,Mathlib/Tactic/SetNotationForOrder.lean,Mathlib/Topology/CWComplex/Classical/Basic.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/Compactification/StoneCech.lean,Mathlib/Topology/Connected/Clopen.lean,Mathlib/Topology/Constructible.lean,Mathlib/Topology/DiscreteSubset.lean,Mathlib/Topology/NhdsWithin.lean,Mathlib/Topology/OpenPartialHomeomorph/IsImage.lean,Mathlib/Topology/Sets/Compacts.lean,Mathlib/Topology/Sets/Opens.lean,Mathlib/Topology/UrysohnsLemma.lean,MathlibTest/Attribute/ToDual.lean,MathlibTest/Delab/SupInf.lean,MathlibTest/SetNotationForOrder.lean,MathlibTest/Simps.lean,MathlibTest/Tactic/GRewrite.lean |
101 |
36 |
['JovanGerb', 'Multramate', 'github-actions', 'jcommelin', 'leanprover-radar', 'mathlib-merge-conflicts'] |
joneugster assignee:joneugster |
1-82374 1 day ago |
1-85502 1 day ago |
55-84546 55 days |
0 |
| 44885 |
3y3y3y-huaiji author:3y3y3y-huaiji |
feat(Combinatorics/Quiver/Path): monotonicity of valuations and cycle obstruction |
Define monotonicity of vertex valuations along paths in a quiver and deduce that
strict valuations rule out non-trivial cycles. As a consequence, `Reachable` is a
partial order when such a valuation exists.
---
> [!NOTE]
> **LLM Disclosure / AI Use**: This PR was prepared with the assistance of an LLM
> (`LLM-generated`). All proofs and statements have been formally verified by Lean 4
> and checked with linters. |
t-combinatorics
LLM-generated
new-contributor
|
64/1 |
Mathlib/Combinatorics/Quiver/Path.lean |
1 |
3 |
['3y3y3y-huaiji', 'github-actions'] |
nobody |
1-74949 1 day ago |
1-74949 1 day ago |
1-74942 1 day |
0 |
| 44887 |
YaelDillies author:YaelDillies |
chore(Topology): deprecate `UniformSpace.ball` in favor of `SetRel.ball` |
Since `UniformSpace.ball` is a right-ball and `SetRel.ball` is a left-ball, we need to move around some appeals to symmetry of the relation. Follow-up to #33077.
---
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|
|
354/297 |
Mathlib/Dynamics/TopologicalEntropy/CoverEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Dynamics/TopologicalEntropy/NetEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/Semiconj.lean,Mathlib/Dynamics/TopologicalEntropy/Subset.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/MeasureTheory/Measure/RegularityCompacts.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean,Mathlib/Topology/MetricSpace/Pseudo/Lemmas.lean,Mathlib/Topology/Metrizable/Basic.lean,Mathlib/Topology/Semicontinuity/Hemicontinuity.lean,Mathlib/Topology/Sequences.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Cauchy.lean,Mathlib/Topology/UniformSpace/Closeds.lean,Mathlib/Topology/UniformSpace/Compact.lean,Mathlib/Topology/UniformSpace/CompactConvergence.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/Equicontinuity.lean,Mathlib/Topology/UniformSpace/HeineCantor.lean,Mathlib/Topology/UniformSpace/Separation.lean,Mathlib/Topology/UniformSpace/Ultra/Basic.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean,Mathlib/Topology/UniformSpace/Uniformizable.lean |
28 |
1 |
['github-actions'] |
nobody |
1-70439 1 day ago |
1-72098 1 day ago |
1-72091 1 day |
0 |
| 44348 |
YaelDillies author:YaelDillies |
chore: replace `exact_mod_cast` with `exact mod_cast` |
The two spellings are equivalent (precisely, `exact_mod_cast t` is defined as `exact mod_cast (t : _)`), but the latter spelling is more composable. For example, `by exact_mod_cast t` is equivalent to `by exact mod_cast t`, which itself simplifies (almost always) to `mod_cast t`. Perform the same change for `apply_mod_cast`.
[Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/exact_mod_cast.20vs.20exact.20mod_cast/with/631181742)
---
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[](https://gitpod.io/from-referrer/)
|
|
235/236 |
Archive/Imo/Imo2024Q1.lean,Archive/Imo/Imo2024Q6.lean,Mathlib/Algebra/GroupWithZero/Action/Pointwise/Finset.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/Algebra/Order/Archimedean/Real/Basic.lean,Mathlib/Algebra/Order/Floor/Defs.lean,Mathlib/Algebra/Squarefree/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Degree.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Asymptotics/LinearGrowth.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/Comp.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/ExponentialBounds.lean,Mathlib/Analysis/Complex/IntegerCompl.lean,Mathlib/Analysis/Complex/Tietze.lean,Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Manifold.lean,Mathlib/Analysis/Complex/ValueDistribution/LogCounting/Basic.lean,Mathlib/Analysis/Convex/SpecificFunctions/Pow.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/InnerProductSpace/NormDet.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/Matrix/Order.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Meromorphic/Order.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/Analysis/Polynomial/MahlerMeasure.lean,Mathlib/Analysis/Real/Pi/Bounds.lean,Mathlib/Analysis/Real/Pi/Irrational.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/IntegralRepresentation.lean,Mathlib/Analysis/SpecialFunctions/Log/Sum.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Complex.lean,Mathlib/Analysis/SumIntegralComparisons.lean,Mathlib/Basic/Real/ConjExponents.lean,Mathlib/Combinatorics/Additive/VerySmallDoubling.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean,Mathlib/Combinatorics/SimpleGraph/Prod.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Int/CardIntervalMod.lean,Mathlib/Data/Int/Log.lean,Mathlib/Data/NNRat/Floor.lean,Mathlib/Data/Nat/Choose/Lucas.lean,Mathlib/Data/ZMod/Units.lean,Mathlib/Dynamics/TopologicalEntropy/CoverEntropy.lean,Mathlib/Geometry/Manifold/Riemannian/Basic.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/GroupTheory/OreLocalization/Cardinality.lean,Mathlib/InformationTheory/Coding/Kraft.lean,Mathlib/InformationTheory/Coding/KraftMcMillan.lean,Mathlib/LinearAlgebra/Matrix/Echelon/Pivot.lean,Mathlib/LinearAlgebra/Reflection.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Defs.lean,Mathlib/MeasureTheory/MeasurableSpace/Card.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/MeasureTheory/VectorMeasure/WithDensityVec.lean,Mathlib/NumberTheory/ADEInequality.lean,Mathlib/NumberTheory/AbelSummation.lean,Mathlib/NumberTheory/Bernoulli.lean,Mathlib/NumberTheory/Bertrand.lean,Mathlib/NumberTheory/Chebyshev.lean,Mathlib/NumberTheory/Fermat.lean,Mathlib/NumberTheory/Harmonic/Bounds.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean,Mathlib/NumberTheory/Harmonic/ZetaAsymp.lean,Mathlib/NumberTheory/Height/MvPolynomial.lean,Mathlib/NumberTheory/Height/NumberField.lean,Mathlib/NumberTheory/LSeries/Convergence.lean,Mathlib/NumberTheory/LSeries/Dirichlet.lean,Mathlib/NumberTheory/LSeries/DirichletContinuation.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaValues.lean,Mathlib/NumberTheory/LSeries/Positivity.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/IsBoundedAtImInfty.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean,Mathlib/NumberTheory/ModularForms/LFunction.lean,Mathlib/NumberTheory/ModularForms/LevelOne/DimensionFormula.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/NumberTheory/Padics/MahlerBasis.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean,Mathlib/NumberTheory/Padics/RingHoms.lean,Mathlib/NumberTheory/Padics/WithVal.lean,Mathlib/NumberTheory/SumPrimeReciprocals.lean,Mathlib/NumberTheory/Transcendental/Liouville/LiouvilleWith.lean,Mathlib/Order/Height.lean |
126 |
6 |
['YaelDillies', 'github-actions', 'grunweg', 'mathlib-merge-conflicts'] |
nobody |
1-70322 1 day ago |
1-73113 1 day ago |
12-19721 12 days |
0 |
| 44889 |
RemyDegenne author:RemyDegenne |
feat(Probability/Kernel): lemmas about invariant measures and powers of a kernel |
This is a first PR in a series towards an ergodic theorem for Markov kernels (convergence in `tvDist` of the power to an invariant measure).
---
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The code was written by an LLM. I reviewed it, notably deleting many trivial API lemmas about pow (and adding two) and golfing the remaining proofs. |
LLM-generated
LeanMachineLearning
t-measure-probability
|
112/1 |
Mathlib/Probability/Kernel/Composition/Comp.lean,Mathlib/Probability/Kernel/Composition/MeasureComp.lean,Mathlib/Probability/Kernel/Invariance.lean |
3 |
2 |
['github-actions'] |
nobody |
1-65929 1 day ago |
1-66586 1 day ago |
1-66579 1 day |
0 |
| 42488 |
joelriou author:joelriou |
feat(AlgebraicTopology/SimplicialSet): the fundamental groupoid of a Kan complex |
In the file `Mathlib/AlgebraicTopology/SimplicialSet/FundamentalGroupoid/Basic.lean`,
the fundamental groupoid of any simplicial set `X` was defined. In this category,
morphisms can be represented by finite compositions of edges and their formal inverses.
In this PR, we show that if `X` is a Kan complex, then a morphism in `FundamentalGroupoid X` can be represented by a single edge, and commutative triangles in the fundamental groupoid of `X` all arise from `Edge.CompStruct` structures (i.e. `2`-simplices of `X`).
---
- [x] depends on: #44775
- [x] depends on: #42523
- [x] depends on: #42526
- [x] depends on: #42527
- [x] depends on: #38216
- [x] depends on: #42473
- [x] depends on: #38664
<!-- Your PR title will become the first line of the commit message.
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[](https://gitpod.io/from-referrer/)
|
t-algebraic-topology
tech debt
|
261/3 |
Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStruct.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStructTruncated.lean,Mathlib/AlgebraicTopology/SimplicialSet/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/KanComplex/FundamentalGroupoid.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean |
6 |
7 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
1-65614 1 day ago |
1-66766 1 day ago |
1-66760 1 day |
1 |
| 44634 |
3y3y3y-huaiji author:3y3y3y-huaiji |
refactor(RingTheory/Ideal): deprecate Ideal.mul_eq_inf_of_coprime |
Deprecate `Ideal.mul_eq_inf_of_coprime` in favor of `Ideal.mul_eq_inf_of_isCoprime`, resolving the TODO in `Mathlib/RingTheory/Ideal/Operations.lean`.
---
> [!NOTE]
> **LLM Disclosure / AI Use**: This PR was prepared with the assistance of an LLM (`LLM-generated`). All proofs and statements have been formally verified by Lean 4 and checked with linters.
|
t-ring-theory
LLM-generated
new-contributor
|
10/8 |
Mathlib/RingTheory/Ideal/Operations.lean |
1 |
4 |
['3y3y3y-huaiji', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
1-58351 1 day ago |
5-49911 5 days ago |
7-74173 7 days |
0 |
| 44859 |
vihdzp author:vihdzp |
chore(SetTheory/Cardinal/Aleph): fix some theorem names |
The preferred form for `succ x` over the ordinals is `x + 1`.
---
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|
t-set-theory
maintainer-merge
|
13/7 |
Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Continuum.lean |
2 |
2 |
['YaelDillies', 'github-actions', 'plp127'] |
nobody |
1-55407 1 day ago |
2-60219 2 days ago |
2-60212 2 days |
0 |
| 43139 |
plp127 author:plp127 |
feat: make `MvPFunctor` universe-polymorphic |
We mirror what is done for the univariate `PFunctor` and make `MvPFunctor` universe-polymorphic. Certain declarations are kept not universe polymorphic for now, including `MvQPF` and many things relating to the `W` and `M` types being fixpoints.
---
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[](https://gitpod.io/from-referrer/)
|
t-data
increases-technical-debt
|
130/105 |
Mathlib/Data/PFunctor/Multivariate/Basic.lean,Mathlib/Data/PFunctor/Multivariate/M.lean,Mathlib/Data/PFunctor/Multivariate/W.lean,Mathlib/Data/QPF/Multivariate/Basic.lean,Mathlib/Data/QPF/Multivariate/Constructions/Cofix.lean,Mathlib/Data/QPF/Multivariate/Constructions/Fix.lean |
6 |
1 |
['github-actions'] |
nobody |
1-54701 1 day ago |
51-25214 51 days ago |
51-25207 51 days |
0 |
| 44849 |
wwylele author:wwylele |
feat(Analysis/ENNReal): iSup of rpow |
These make it easier to rw.
---
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|
t-analysis
maintainer-merge
|
20/0 |
Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean |
1 |
6 |
['SnirBroshi', 'github-actions', 'wwylele'] |
nobody |
1-52537 1 day ago |
2-46838 2 days ago |
2-77095 2 days |
1 |
| 44661 |
jessealama author:jessealama |
feat(Data/List): add `List.IsChain.iterate` and `List.getLast_iterate` |
Add two basic lemmas about `List.iterate`:
- `List.IsChain.iterate`: if `r a (f a)` holds for every `a`, then `List.iterate f a n` is an `r`-chain.
- `List.getLast_iterate` (`@[simp]`): the last element of a nonempty `List.iterate f a n` is `f^[n - 1] a`, complementing the existing `getElem_iterate`.
---
Both were originally part of #36376 (where @YaelDillies suggested their current form), but are no longer needed there, so they are proposed separately here.
|
t-data
maintainer-merge
|
12/0 |
Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Iterate.lean |
2 |
9 |
['Rida-Hamadani', 'YaelDillies', 'github-actions', 'jessealama'] |
nobody |
1-51116 1 day ago |
2-56945 2 days ago |
3-77242 3 days |
0 |
| 44895 |
JovanGerb author:JovanGerb |
fix(ClickSuggestions): improve and test `isExplicitEq` |
This PR improves and tests the `isExplicitEq` function that `#click_suggestions` uses to deduplicate its suggestions.
---
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|
t-meta |
60/21 |
Mathlib/Tactic/ClickSuggestions/Util.lean,MathlibTest/ClickSuggestions/Deduplicate.lean |
2 |
1 |
['github-actions'] |
nobody |
1-49199 1 day ago |
1-52967 1 day ago |
1-52960 1 day |
1 |
| 44825 |
Multramate author:Multramate |
chore: rename `coe_nat`/`nat_cast` lemmas to `natCast` |
This renames Lean 3 style `coe_nat` and `nat_cast` in lemma names about `Nat.cast` to `natCast`.
🤖 Generated with [Claude Code](https://claude.com/claude-code) |
LLM-generated |
114/59 |
Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/Group/Int/Even.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Coeff.lean,Mathlib/Algebra/Order/Field/Power.lean,Mathlib/Algebra/Ring/Int/Parity.lean,Mathlib/Algebra/SkewPolynomial/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Degree.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev/RootsExtrema.lean,Mathlib/Basic/ENNReal/Basic.lean,Mathlib/Basic/NNReal/Defs.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/MeasureTheory/Constructions/Polish/EmbeddingReal.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean,Mathlib/NumberTheory/Height/NumberField.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/NumberTheory/Real/GoldenRatio.lean,Mathlib/RingTheory/Binomial.lean,Mathlib/RingTheory/MvPolynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/StructurePolynomial.lean,Mathlib/SetTheory/Cardinal/Divisibility.lean |
28 |
2 |
['Multramate', 'github-actions', 'vihdzp'] |
nobody |
1-48256 1 day ago |
3-51064 3 days ago |
3-51057 3 days |
0 |
| 44810 |
zixiaowang17 author:zixiaowang17 |
feat(Combinatorics): add abstract graphical Markov properties |
Introduce the global, local, and pairwise Markov properties for undirected graphs, and prove
the forward implications global → local → pairwise under the semigraphoid axioms.
The implementation is a single module importing `Mathlib.Combinatorics.SimpleGraph.Walk.Basic`.
The current framework allows arbitrary vertex types, including infinite and uncountable types.
Reference: David Montague and Bala Rajaratnam, *Graphical Markov models for infinitely many
variables*, *Transactions of the American Mathematical Society* **370** (2018), no. 11,
7557–7603. [doi:10.1090/tran/7048](https://doi.org/10.1090/tran/7048).
---
I want to introduce “a graphical framework in which we can analyze the Markov properties
from a purely set theoretic perspective which is independent of probability theory,” as
described in [Section 4](https://arxiv.org/pdf/1501.07878#page=8).
Motivation: I was trying to provide a common foundation connecting graphical models in
statistics, random fields, and percolation on lattices. Along the way, I found that most of
the materials I read assumed finite vertex sets. However, I want to understand better what
drives the equivalence of the Markov properties, so that we can talk about theorems with
more flexibility. I then found this paper, which, in Section 4, takes a purely set-theoretic approach
to independence and graphical Markov properties, separately from its treatment of
measure-theoretic conditional independence in probabilistic models.
If this PR meets the requirements and is in the right direction, I plan to finish proving
the equivalence of the pairwise, local, and global Markov properties for ternary relations
under suitable intersection assumptions. In the long term, I plan to connect conditional
independence in probability with graphical models, including DAGs.
AI assistance: OpenAI Codex assisted with the Lean definitions and proofs. I checked every
line of the code. |
t-combinatorics
LLM-generated
new-contributor
|
138/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Markov.lean,docs/references.bib |
3 |
4 |
['github-actions', 'zixiaowang17'] |
nobody |
1-46989 1 day ago |
4-9920 4 days ago |
4-9913 4 days |
0 |
| 44899 |
RemyDegenne author:RemyDegenne |
feat: add a class for reflexive topological vector spaces |
Define reflexive spaces and show that
- Hilbert spaces are reflexive
- finite-dimensional normed spaces are reflexive
---
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The first commit of this PR was LLM-generated (it results from an interaction between me and an LLM over several steps, but the code is entirely from the LLM). Subsequent commits are my changes.
The main reason I want this class is to then introduce spaces with the Radon-Nilodym property (for properties of martingales) and show that reflexive spaces have it. |
brownian
t-analysis
LLM-generated
t-measure-probability
|
250/33 |
Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Reflexive.lean,Mathlib/Analysis/Normed/Module/DoubleDual.lean,Mathlib/Analysis/Normed/Module/HahnBanach.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean |
5 |
1 |
['github-actions'] |
nobody |
1-46666 1 day ago |
1-47422 1 day ago |
1-47415 1 day |
0 |
| 43841 |
tb65536 author:tb65536 |
feat(Analysis/Normed/Ring/WithAbs): more API for `AbsoluteValue.under` |
This PR adds more API for `AbsoluteValue.under`, following the analogous API for `Ideal.under`.
---
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[](https://gitpod.io/from-referrer/)
|
t-analysis |
32/0 |
Mathlib/Analysis/Normed/Ring/WithAbs.lean |
1 |
7 |
['github-actions', 'tb65536', 'themathqueen'] |
nobody |
1-46638 1 day ago |
1-47376 1 day ago |
31-42939 31 days |
0 |
| 44900 |
justus-springer author:justus-springer |
feat(Geometry/Convex/Cone/Caratheodory): conic Carathéodory theorem |
Carathéodory's theorem (see `Analysis/Convex/Caratheodory.lean`) says that any point in the convex hull of a set can be represented as a convex combination of some affinely independent subset. This PR adds the conic version of this theorem: Every point in the conic hull (`PointedCone.hull`) of a set can be represented as a positive span of some linearly independent subset.
We basically follow the same proof strategy as in `Analysis/Convex/Caratheodory.lean`. The conic version is slightly simpler, as the weights don't have to sum to one. Also, we use strong induction on finsets directly instead of defining a minimal set (see also the refactor PR #44863).
A small helper lemma `mem_hull_finset` is also added, the finset version of `mem_hull_set`.
---
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|
t-convex-geometry |
108/0 |
Mathlib.lean,Mathlib/Geometry/Convex/Cone/Caratheodory.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean |
3 |
1 |
['github-actions'] |
nobody |
1-45789 1 day ago |
1-46751 1 day ago |
1-46744 1 day |
0 |
| 39941 |
mkaratarakis author:mkaratarakis |
feat(Data/List): add count lemmas for duplicate detection |
Add general list count lemmas used in the Perron–Frobenius quiver-path development:
---
Relocated from the PF-specific file per review feedback. Proofs use upstream `List.Duplicate` API and `grind` where appropriate (per @chenson2018).
Part of the Perron–Frobenius formalization
|
t-data |
14/0 |
Mathlib/Data/List/Count.lean |
1 |
13 |
['SnirBroshi', 'chenson2018', 'eric-wieser', 'github-actions', 'mkaratarakis', 'mkaxiomatic-ai'] |
nobody |
1-45466 1 day ago |
1-45466 1 day ago |
116-55399 116 days |
0 |
| 39915 |
mkaratarakis author:mkaratarakis |
feat(Analysis/Complex): the equality case of the triangle inequality |
The equality case of the triangle inequality for a finite sum
Part of the Perron–Frobenius formalization (with @or4nge19).
---
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[](https://gitpod.io/from-referrer/)
cc @or4nge19 for review |
t-analysis |
142/1 |
Mathlib.lean,Mathlib/Analysis/Convex/TriangleEquality.lean,Mathlib/Analysis/Normed/Module/Normalize.lean,Mathlib/LinearAlgebra/Ray.lean |
4 |
60 |
['github-actions', 'j-loreaux', 'mkaratarakis', 'themathqueen', 'wwylele'] |
nobody |
1-42656 1 day ago |
1-44733 1 day ago |
23-74950 23 days |
4 |
| 44906 |
yudukikun5120 author:yudukikun5120 |
feat(Archive): formalize negation in vector logic |
This adds a formalization of negation in Mizraji's two-valued vector logic to `Archive/VectorLogic.lean`, using mathlib's matrix and real-number APIs.
For two orthonormal real vectors `s` and `n` in an arbitrary finite-dimensional coordinate space, define `N = nsᵀ + snᵀ` and the logical identity `I₂ = ssᵀ + nnᵀ`. Prove that negation exchanges the truth vectors, exchanges the coefficients of their linear combinations, and satisfies `N * N = I₂`. Double negation fixes every linear combination of the truth vectors. The formalization also shows that negation annihilates vectors orthogonal to both, so it does not assert that `N²` is the ambient identity in higher dimension.
The definitions follow Eduardo Mizraji's *Vector logics: The matrix-vector representation of logical calculus* (1992), as reproduced in §4.2, equations (15)–(16), of his 2016 paper: https://doi.org/10.1387/theoria.13959.
---
This is a draft for feedback on whether this paper-specific formalization is suitable for `Archive`; its placement has not been agreed with maintainers.
Validation on macOS arm64 with Lean 4.35.0:
- `lake build Archive.VectorLogic`
- `lake exe lint-style Archive.VectorLogic`
- `lake exe mk_all --lib Archive --check`
- Separate local checks with a three-dimensional truth pair, including a counterexample to the ambient identity assertion.
AI disclosure: OpenAI Codex generated the implementation, proofs, and this PR description, and ran the local validation. The changes are marked as LLM-generated. This description does not claim completion of independent human review.
|
LLM-generated
new-contributor
|
102/0 |
Archive.lean,Archive/VectorLogic.lean |
2 |
3 |
['github-actions', 'yudukikun5120'] |
nobody |
1-42340 1 day ago |
1-42349 1 day ago |
1-42342 1 day |
0 |
| 43757 |
mkaratarakis author:mkaratarakis |
feat(Analysis/Complex/Arg): add `normalize_mul_star` |
Add `Complex.normalize_mul_star`: multiplying `normalize z` (the unit complex number in the direction of `z`) by `star z` gives `‖z‖`. |
t-analysis
maintainer-merge
|
5/0 |
Mathlib/Analysis/Complex/Arg.lean |
1 |
17 |
['github-actions', 'mkaratarakis', 'themathqueen'] |
nobody |
1-42311 1 day ago |
1-49640 1 day ago |
17-43984 17 days |
0 |
| 43945 |
Nicola9Falciola author:Nicola9Falciola |
feat(LinearAlgebra/Matrix/GeneralLinearGroup/Defs): add `MulEquiv` for `GL` |
Following the API in Data/Matrix/Basic I add :
- the `MulEquiv` : `GL n R ≃* GL n S`induced by a `RingEquiv`
- the `MulEquiv` : `GL n R ≃* (GL n R)\mop `
- the `MulEquiv` : `GL n (ULift.{w} R) ≃* GL n R`
- the `MulEquiv` : `GL m R ≃* GL n R` for `m ≃ n`
- the `MulEquiv` : `GL n (Π i, R i) ≃* Π i, GL n (R i)`
---
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[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
96/0 |
Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Defs.lean |
1 |
74 |
['Nicola9Falciola', 'eric-wieser', 'github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'themathqueen'] |
j-loreaux assignee:j-loreaux |
1-41576 1 day ago |
3-11260 3 days ago |
27-48742 27 days |
2 |
| 43349 |
Nicola9Falciola author:Nicola9Falciola |
feat(Algebra/FreeAbelianGroup/Finsupp): add api for the coeff of a single element |
---
Add three API lemmas computing the coefficent of the elements `of x` for `x : X` in the FreeAbelianGroup.
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[](https://gitpod.io/from-referrer/)
|
new-contributor
t-algebra
maintainer-merge
label:t-algebra$ |
7/0 |
Mathlib/Algebra/FreeAbelianGroup/Finsupp.lean |
1 |
10 |
['Nicola9Falciola', 'github-actions', 'themathqueen'] |
nobody |
1-41348 1 day ago |
2-20025 2 days ago |
44-31270 44 days |
0 |
| 44802 |
wwylele author:wwylele |
feat(MeasureTheory/Lebesgue): one-dimensional Brunn–Minkowski theorem |
This is the starting point of upstreaming https://github.com/hojonathanho/isoperimetric (with author's permission at https://github.com/hojonathanho/isoperimetric/issues/1) for the general Brunn–Minkowski theorem. The proof strategy follows https://terrytao.wordpress.com/2011/09/16/the-brunn-minkowski-inequality-for-nilpotent-groups/, which goes like:
1-d Brunn–Minkowski -> 1-d Prékopa-Leindler -> n-d Prékopa-Leindler -> n-d Brunn–Minkowski
Co-authored-by: Jonathan Ho <hojonathanho@gmail.com>
---
~~As far as I know, no AI was used (except for my request for copilot review below, which returned nothing)~~
There was a major revision to this PR. The first version was written without AI, which proved the statement `MeasurableSet A -> MeasurableSet B -> nonemptiness -> volume A + volume B ≤ volume (A + B)`. This was then re-written using an Aristotle generated proof (see https://github.com/leanprover-community/mathlib4/pull/44802#issuecomment-6146960763), which removes the measurability hypothesis and generalize the theorem to partially ordered monoid + pull-back (sub-)invariant measure (so this would also work on e.g. NNReal). The AI-generated proof has been restructured by me manually.
On the topic generalization of the ` μ A + μ B ≤ μ (A + B)`-like inequality, there is also [Kemperman's theorem](https://terrytao.wordpress.com/2011/12/26/a-variant-of-kempermans-theorem/) which holds for locally compact connected groups, which includes `Real`. The proof of this is beyond my ability at the moment, plus it still generally requires measurability, plus it requires a group instead of a just a magma. So the generalization to ordered magma is an interesting one on its own, and I chose to go in that direction in this PR
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Moves:
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- Nat.bit1_add_bit1
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|
t-measure-probability
LLM-generated
|
76/4 |
Mathlib/MeasureTheory/Measure/Interval.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/Topology/Order/Basic.lean |
3 |
17 |
['SnirBroshi', 'copilot-pull-request-reviewer', 'github-actions', 'wwylele'] |
nobody |
1-41227 1 day ago |
1-41640 1 day ago |
2-33709 2 days |
1 |
| 43678 |
mariainesdff author:mariainesdff |
feat(Algebra/Order/Group/Cylic): add OrderMonoidIso.map_genLTOne |
Co-authored-by: @xgenereux
---
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[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
56/0 |
Mathlib.lean,Mathlib/Algebra/Order/Group/Cyclic.lean,Mathlib/Algebra/Order/Group/Subgroup.lean |
3 |
9 |
['github-actions', 'jjdishere', 'mariainesdff'] |
nobody |
1-39762 1 day ago |
1-40515 1 day ago |
17-24452 17 days |
3 |
| 44898 |
Vierkantor author:Vierkantor |
fix(Tactic/CrossRefAttribute): add cross-reference tag to Verso docstring |
This PR fixes the issue where a cross-reference tag (e.g. Stacks, Kerodon, Wikidata, ...) overwrites Verso docstrings with a link to the tag. The issue is that the attribute would write to the Markdown docstring extension, which takes priority over the Verso docstring extension. To fix it, we write the tag to the Verso docstring based on the value of the `doc.verso` option.
Note that a declaration docstring, whether Markdown or Verso, is still incompatible with an attribute-generated docstring, since they are written in two different threads. This PR merely makes the Verso case broken in the same way as the Markdown case.
See Zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Cross-reference.20attributes.20don.27t.20change.20the.20docstring/with/631861749
---
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|
documentation
t-meta
|
77/2 |
Mathlib/Tactic/CrossRefAttribute.lean,MathlibTest/CrossRefAttribute.lean |
2 |
2 |
['Vierkantor', 'github-actions'] |
nobody |
1-37989 1 day ago |
1-41230 1 day ago |
1-44166 1 day |
0 |
| 44909 |
RemyDegenne author:RemyDegenne |
feat(MeasureTheory): the Kolmogorov extension theorem |
Co-authored-by: Peter Pfaffelhuber <41927422+pfaffelh@users.noreply.github.com>
---
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It was proved 3 years ago in another repo, and is finally making its way to Mathlib.
The proof of `cylinder_mem_countableInfClosure_supClosure` was written by an LLM (it replaces a longer argument we wrote manually before).
|
brownian
t-measure-probability
|
336/0 |
Mathlib.lean,Mathlib/MeasureTheory/Constructions/KolmogorovExtension.lean,Mathlib/MeasureTheory/Measure/AddContent/CompactSystem.lean,Mathlib/Topology/Compactness/CompactSystem.lean |
4 |
2 |
['github-actions'] |
EtienneC30 assignee:EtienneC30 |
1-37800 1 day ago |
1-38508 1 day ago |
1-38501 1 day |
0 |
| 44878 |
scottdhughes author:scottdhughes |
feat(NumberTheory/Divisors): add a divisor-count doubling bound |
Adds `Nat.two_mul_card_divisors_le_card_divisors_mul_of_not_dvd`:
```lean
theorem Nat.two_mul_card_divisors_le_card_divisors_mul_of_not_dvd {a b : ℕ}
(hb : b ≠ 0) (hnot : ¬ b ∣ a) :
2 * a.divisors.card ≤ (a * b).divisors.card
```
The proof places the divisors of `a` and their images under multiplication by `b` inside the divisors of `a * b`. These sets are disjoint because `b ∤ a`, and multiplication by nonzero `b` preserves cardinality. The hypothesis `a ≠ 0` follows from nondivisibility; no coprimality hypothesis is needed.
Motivated by work on Erdős problem 647. The addition uses the existing finite-divisor API in `Mathlib/NumberTheory/Divisors.lean` and introduces no imports.
### Validation
- Fresh affected-module build with warnings treated as failures; style and default declaration linters passed.
- Checked the exported type, the original three-premise consumer interface, and boundary examples, including the sharp noncoprime case `(a, b) = (2, 4)`. The theorem uses only `propext`, `Classical.choice` and `Quot.sound`.
- Aggregate-import and diff checks passed. Whole-library builds and full hosted CI have not been run locally.
### AI disclosure
OpenAI Codex generated the standalone Lean proof from an existing lemma in our Erdős problem 647 development and assisted with API and overlapping-PR searches, integration, and local validation. Codex also drafted this description and performed an additional source review; that review did not include separate compilation. This contribution contains LLM-generated code.
|
t-number-theory
new-contributor
LLM-generated
|
28/0 |
Mathlib/NumberTheory/Divisors.lean |
1 |
2 |
['copilot-pull-request-reviewer', 'github-actions'] |
nobody |
1-34985 1 day ago |
1-35098 1 day ago |
1-35091 1 day |
0 |
| 43494 |
wrenna-robson author:wrenna-robson |
refactor: rename the `diag` name token to `diagonal` |
Per recent discussion on Zulip, we want to move away from using `diag` as a name token. This renames every declaration where `diag` abbreviates *diagonal* to spell it out in full, with a `@[deprecated]` alias for each.
I've tried to split it into reviewable commits by area (`Prod`/`offDiag`, `Sym2`/`Finset.diag`, `antidiag`, `CategoryTheory`, misc, leftovers). I will try and break it up into discrete sub-PRs if necessary.
Out of scope, handled in follow-ups:
- `Set.diagonal` / `Prod.diagonalSet`- to be handled in #38380
- the `Matrix.diag` / `blockDiag` / `IsDiag` constructor/extractor swap, and other names about the diagonal entries of a matrix (`Matrix.IsFiniteCartan.diag`/`offDiag_nonpos`, `A_diag_eq_two`, `*_off_diag_nonpos`, `IsAdjMatrix.apply_diag_ne`, `compl_apply_diag`)
- the `diag`-means-*diagram* cases (`(Co)limitPresentation.diag`, `Galois.EssSurj.quotientDiag`, `CommDiag`), which will be renamed to `diagram`
- `List.mapDiagM'`, which mirrors `List.mapDiagM` upstream and should stay in step with it
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
LLM-generated |
1817/1011 |
Archive/Imo/Imo1998Q2.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Counterexamples/SorgenfreyLine.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/Sym.lean,Mathlib/Algebra/DirectSum/LinearMap.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Coeff.lean,Mathlib/Algebra/Order/Antidiag/Finsupp.lean,Mathlib/Algebra/Order/Antidiag/FinsuppEquiv.lean,Mathlib/Algebra/Order/Antidiag/Nat.lean,Mathlib/Algebra/Order/Antidiag/Pi.lean,Mathlib/Algebra/Order/BigOperators/Group/LocallyFinite.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/ModelCategory/Cylinder.lean,Mathlib/AlgebraicTopology/ModelCategory/PathObject.lean,Mathlib/AlgebraicTopology/Quasicategory/StrictSegal.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/FundamentalGroupoid/Homotopy.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Basic/Finite/Prod.lean,Mathlib/CategoryTheory/Abelian/NonPreadditive.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Filtered/Final.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Sifted.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Limits/Colimits.lean,Mathlib/CategoryTheory/MorphismProperty/Representable.lean,Mathlib/CategoryTheory/Products/Basic.lean,Mathlib/CategoryTheory/Subterminal.lean,Mathlib/Combinatorics/Enumerative/Partition/Basic.lean,Mathlib/Combinatorics/Enumerative/Partition/GenFun.lean,Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/DeleteEdges.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Operations.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Energy.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Increment.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Removal.lean,Mathlib/Data/Fin/Tuple/NatAntidiagonal.lean,Mathlib/Data/Finset/Pi.lean,Mathlib/Data/Finset/Prod.lean,Mathlib/Data/Finset/Sym.lean,Mathlib/Data/Fintype/Pi.lean,Mathlib/Data/Fintype/Prod.lean,Mathlib/Data/List/OffDiag.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/QPF/Multivariate/Constructions/Cofix.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/Sym/Card.lean,Mathlib/Data/Sym/NatCard.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/Data/Sym/Sym2/Card.lean,Mathlib/Data/TypeVec.lean,Mathlib/LinearAlgebra/ExteriorPower/Basis.lean,Mathlib/LinearAlgebra/Matrix/Cartan/Realisation.lean,Mathlib/LinearAlgebra/Matrix/Diagonal.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/Basis.lean,Mathlib/Logic/Function/Defs.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/HeckeRing/Defs.lean,Mathlib/NumberTheory/Height/Basic.lean,Mathlib/Order/Filter/Prod.lean,Mathlib/Order/FixedPoints.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Probability/Combinatorics/BinomialRandomGraph/Defs.lean,Mathlib/Probability/Kernel/Basic.lean,Mathlib/Probability/Kernel/Composition/MeasureCompProd.lean,Mathlib/Probability/Kernel/Condexp.lean,Mathlib/Probability/Kernel/Deterministic.lean,Mathlib/Probability/Moments/SubGaussian.lean,Mathlib/RingTheory/Coalgebra/Basic.lean,Mathlib/RingTheory/Discriminant.lean,Mathlib/RingTheory/MatrixPolynomialAlgebra.lean,Mathlib/RingTheory/MvPowerSeries/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Substitution.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/WittVector/InitTail.lean,Mathlib/RingTheory/WittVector/IsPoly.lean,Mathlib/SetTheory/Cardinal/Cofinality/Club.lean |
118 |
38 |
['SnirBroshi', 'github-actions', 'grunweg', 'kim-em', 'mathlib-merge-conflicts', 'themathqueen', 'wrenna-robson'] |
nobody |
1-32918 1 day ago |
1-36733 1 day ago |
3-28789 3 days |
0 |
| 44915 |
Hagb author:Hagb |
feat(Algebra/MonoidAlgebra/MapDomain): lemmas about `coeff` of `toMultiplicative`/`toAdditive`'ed element |
It is used by #44913.
---
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|
t-algebra
easy
label:t-algebra$ |
8/0 |
Mathlib/Algebra/MonoidAlgebra/MapDomain.lean |
1 |
1 |
['github-actions'] |
nobody |
1-32565 1 day ago |
1-35178 1 day ago |
1-35171 1 day |
1 |
| 44864 |
user202729 author:user202729 |
feat(Order/Bounds): notation for sSup and sInf |
Also fix a typo (add a full stop) and change some call sites to use the new notation.
---
As discussed on Zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Adding.20notation.20for.20sSup.2FsInf.3F |
t-topology
new-contributor
|
14/3 |
Mathlib/Order/Bounds/Defs.lean,Mathlib/Order/SetNotation.lean,Mathlib/Topology/Sets/Closeds.lean,Mathlib/Topology/Sets/Opens.lean |
4 |
5 |
['Multramate', 'github-actions', 'user202729'] |
nobody |
1-31349 1 day ago |
1-33997 1 day ago |
1-37751 1 day |
0 |
| 44919 |
plp127 author:plp127 |
feat: `Finset.exists_mem_cons` |
We already have `Finset.exists_mem_insert` and `Finset.forall_mem_cons`, so add a lemma `Finset.exists_mem_cons` as well.
---
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|
t-data
easy
|
4/0 |
Mathlib/Data/Finset/Insert.lean |
1 |
1 |
['github-actions'] |
nobody |
1-26037 1 day ago |
1-28367 1 day ago |
1-28360 1 day |
0 |
| 44723 |
mycaule author:mycaule |
feat(CategoryTheory/Adjunction/Idempotent): fixed points and idempotent adjunctions |
New file `Mathlib/CategoryTheory/Adjunction/Idempotent.lean`. For `adj : L ⊣ R` with unit `η` and counit `ε`:
`Adjunction.idempotent_tfae`: the four conditions `ηR`, `Rε`, `εL`, `Lη` invertible are equivalent
`Adjunction.map_map_unit_app_of_idempotent`, `Adjunction.map_map_counit_app_of_idempotent`: `RLη_X = η_{RLX}` and `LRε_Y = ε_{LRY}` in the idempotent case
`Adjunction.fixedLeft`, `Adjunction.fixedRight`: the objects at which `η`, resp. `ε`, is an isomorphism (closed under isomorphisms; `fixedLeft_iff_exists`, `fixedRight_iff_exists`)
`Adjunction.fixedEquiv`: for any adjunction, `L` and `R` restrict to an equivalence `adj.fixedLeft.FullSubcategory ≌ adj.fixedRight.FullSubcategory`
`Adjunction.fixedLeftAdjunction`, `Adjunction.fixedLeftReflective`: if the adjunction is idempotent, `fixedLeft` is reflective in `C` with reflector `L ⋙ R`
`Adjunction.fixedRightAdjunction`, `Adjunction.fixedRightCoreflective`: dually, `fixedRight` is coreflective in `D` with coreflector `R ⋙ L`
`map_map_unit_app_of_idempotent` is the generalization asked for by the TODO above `unit_obj_eq_map_unit` in `Adjunction/Reflective.lean` (from reflective to idempotent adjunctions).
Then `PreservesColimits` of the reflector, `HasColimits` of the fixed part (`hasColimits_of_reflective`) and the localization property (`Adjunction.isLocalization`) follow from existing mathlib lemmas.
Questions for reviewers: names (`fixedLeft`/`fixedRight`, or e.g. `unitIsIso`/`counitIsIso`); whether to add a class `Adjunction.IsIdempotent` (one of the four conditions) with instances for reflective and coreflective adjunctions, in this PR or a follow-up; and whether to add `IsIso adj.toMonad.μ ↔ idempotent` next to `μ_iso_of_reflective`.
AI disclosure: the Lean proof was written by an AI model (Claude, Anthropic) under my direction. I have read and checked it and will handle the review. It builds against current master.
|
t-category-theory
new-contributor
LLM-generated
|
257/0 |
Mathlib.lean,Mathlib/CategoryTheory/Adjunction/Idempotent.lean |
2 |
2 |
['github-actions'] |
dagurtomas assignee:dagurtomas |
1-24548 1 day ago |
5-61229 5 days ago |
5-61222 5 days |
0 |
| 44922 |
plp127 author:plp127 |
feat(Algebra/Ring/Subsemiring): `Subsemiring.coe_natCast` |
Prove the theorem `Subsemiring.coe_natCast`, which states `((n : s) : R) = (n : R)` for `n : Nat` and `s : Subsemiring R`.
---
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|
t-algebra
easy
maintainer-merge
label:t-algebra$ |
4/0 |
Mathlib/Algebra/Ring/Subsemiring/Defs.lean |
1 |
2 |
['github-actions', 'themathqueen'] |
nobody |
1-22357 1 day ago |
1-27889 1 day ago |
1-27882 1 day |
0 |
| 44908 |
DanielJHorton author:DanielJHorton |
doc(LinearAlgebra/ExteriorPower/Basic): fix typo in docstring |
Fix a small typo in the docstring of `exteriorPower.ιMulti`.
easy
---
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|
t-algebra
maintainer-merge
label:t-algebra$ |
1/1 |
Mathlib/LinearAlgebra/ExteriorPower/Basic.lean |
1 |
2 |
['github-actions', 'themathqueen'] |
nobody |
1-20662 1 day ago |
1-40749 1 day ago |
1-40742 1 day |
0 |
| 43415 |
gasparattila author:gasparattila |
feat: lattice lemmas about `Submodule.toAffineSubspace` |
---
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[](https://gitpod.io/from-referrer/)
|
t-algebra label:t-algebra$ |
62/0 |
Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean |
1 |
4 |
['gasparattila', 'github-actions', 'mathlib-merge-conflicts', 'themathqueen'] |
nobody |
1-18978 1 day ago |
1-20327 1 day ago |
42-77592 42 days |
0 |
| 44910 |
lua-vr author:lua-vr |
feat(Dynamics/BirkhoffSum): measurability and integrability of Birkhoff sums |
We add conditions for the measurability and integrability of Birkhoff sums.
---
Split out of #34031, was previously reviewed there. I can't act on that review for now and it seems to be of independent interest (#44624).
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|
t-dynamics |
72/0 |
Mathlib.lean,Mathlib/Dynamics/BirkhoffSum/Integrable.lean |
2 |
1 |
['github-actions'] |
nobody |
1-15365 1 day ago |
1-39146 1 day ago |
1-39139 1 day |
0 |
| 44877 |
grunweg author:grunweg |
chore: rename `toContinuousMap` to `ContinuousMap.ofClass` |
This is in line with #31365, and avoids shadowing names of concrete projections `FooClass.toContinuousMap`.
---
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|
t-topology
tech debt
maintainer-merge
|
30/24 |
Mathlib/AlgebraicGeometry/IdealSheaf/Subscheme.lean,Mathlib/Topology/Algebra/ContinuousAffineEquiv.lean,Mathlib/Topology/ContinuousMap/Defs.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/ContinuousMap/StarOrdered.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Homotopy/TopCat/Path.lean,Mathlib/Topology/Homotopy/TopCat/ZerothHomotopy.lean,Mathlib/Topology/UniformSpace/Path.lean |
11 |
8 |
['github-actions', 'grunweg', 'themathqueen'] |
nobody |
1-13708 1 day ago |
1-16134 1 day ago |
1-25199 1 day |
1 |
| 43916 |
qawbecrdtey author:qawbecrdtey |
feat(Data/Finsupp/Weight): add `degree_strictMono` |
---
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```lean
lemma degree_strictMono {R : Type*}
[AddCommMonoid R] [PartialOrder R] [CanonicallyOrderedAdd R] [AddRightStrictMono R] :
StrictMono (Finsupp.degree (σ := σ) (R := R))
``` |
t-data |
8/0 |
Mathlib/Data/Finsupp/Weight.lean |
1 |
9 |
['Ruben-VandeVelde', 'github-actions', 'qawbecrdtey', 'themathqueen'] |
nobody |
1-8397 1 day ago |
5-7377 5 days ago |
25-56303 25 days |
1 |
| 27707 |
amellendijk author:amellendijk |
feat(NumberTheory/SelbergSieve): define Selberg's weights and prove basic results |
This PR continues the work from #23635.
Original PR: https://github.com/leanprover-community/mathlib4/pull/23635
- [x] depends on: #27702 |
t-number-theory |
139/2 |
Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/SelbergSieve.lean |
2 |
36 |
['AlexKontorovich', 'MichaelStollBayreuth', 'ajirving', 'amellendijk', 'github-actions', 'loefflerd', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot'] |
jjdishere assignee:jjdishere |
1-6103 1 day ago |
99-53907 99 days ago |
103-12227 103 days |
1 |
| 31981 |
jsm28 author:jsm28 |
feat(Geometry/Euclidean/Incenter): `tangentSet` and `tangentsFrom` lemmas |
Add lemmas relating the faces of a simplex to `tangentSet` and `tangentsFrom` for an exsphere, in particular for a triangle that any two side lines are the `tangentsFrom` their shared vertex to the insphere or any exsphere.
---
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- [x] depends on: #31891
- [x] depends on: #31892
- [x] depends on: #31893
- [x] depends on: #31978
- [x] depends on: #31979
- [x] depends on: #31980
- [x] depends on: #32296
[](https://gitpod.io/from-referrer/)
|
t-euclidean-geometry |
95/0 |
Mathlib/Geometry/Euclidean/Incenter/Basic.lean |
1 |
18 |
['Parcly-Taxel', 'github-actions', 'jsm28', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'pepamontero', 'wwylele'] |
eric-wieser assignee:eric-wieser |
1-6102 1 day ago |
4-56521 4 days ago |
49-34264 49 days |
1 |
| 43100 |
JJYYY-JJY author:JJYYY-JJY |
feat(Analysis/Complex/CauchyIntegral): add Cauchy formula at interior points |
This generalizes the higher-order Cauchy integral formula from the center of a disc to an arbitrary point in its interior, and closes the TODO.
Co-authored-by: ajirving <29164966+ajirving@users.noreply.github.com>
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|
t-analysis |
58/14 |
Mathlib/Analysis/Complex/CauchyIntegral.lean |
1 |
2 |
['ajirving', 'github-actions'] |
j-loreaux assignee:j-loreaux |
1-6101 1 day ago |
52-70438 52 days ago |
52-70431 52 days |
0 |
| 43502 |
teorth author:teorth |
feat(NumberTheory/LSeries): root numbers and non-vanishing in the left half-plane |
`Mathlib/NumberTheory/LSeries/Nonvanishing.lean` currently establishes nonvanishing of Dirichlet
`L`-functions and the Riemann zeta function are non-zero to the **right** of the critical strip
(`re s ≥ 1`). This PR adds the counterparts on the **left** (`re s ≤ 0`), which follow from the
functional equation, together with some auxiliary facts about root-numbers and Gauss-sums which
could be independently useful.
---
## Root numbers and Gauss sums
* `DirichletCharacter.completedLFunction_ne_zero_of_one_le_re`: the completed `L`-function
`Λ(χ, s)` is non-zero for `1 ≤ re s` (except for the trivial character at `s = 1`).
* `DirichletCharacter.rootNumber_mul_rootNumber_inv`: for a primitive character,
`rootNumber χ * rootNumber χ⁻¹ = 1`, obtained formally from the functional equation applied to
both `χ` and `χ⁻¹`.
* `DirichletCharacter.norm_rootNumber`: `‖rootNumber χ‖ = 1` for primitive `χ`.
* `DirichletCharacter.norm_gaussSum_stdAddChar`: `‖gaussSum χ stdAddChar‖ = √N` for primitive `χ`
— the classical evaluation `|τ(χ)| = √N`, here derived from the functional equation rather than
the usual finite-field argument, so it holds for every modulus (Mathlib previously only had
Gauss-sum non-vanishing over finite fields).
## Non-vanishing in the left half-plane
* `DirichletCharacter.LFunction_eq_zero_iff_of_re_nonpos`: for a primitive character and `re s ≤ 0` with `χ ≠ 1` or `s` non-zero, the L-function vanishes precisely when the gamma factor vanishes.
* `riemannZeta_eq_zero_iff_of_re_nonpos`: for `re s ≤ 0`, `ζ s = 0` iff `s` is a
negative even integer.
The code here was initially LLM-generated, but then heavily golfed and reviewed by the author. |
t-number-theory |
97/4 |
Mathlib/NumberTheory/DirichletCharacter/Basic.lean,Mathlib/NumberTheory/DirichletCharacter/Bounds.lean,Mathlib/NumberTheory/LSeries/Dirichlet.lean,Mathlib/NumberTheory/LSeries/DirichletContinuation.lean,Mathlib/NumberTheory/LSeries/Nonvanishing.lean |
5 |
1 |
['github-actions'] |
MichaelStollBayreuth assignee:MichaelStollBayreuth |
1-6098 1 day ago |
40-19401 40 days ago |
40-19394 40 days |
0 |
| 44346 |
justus-springer author:justus-springer |
doc(AlgebraicGeometry/EffectiveEpi): add stacks tag `023Q` |
Follow-up to #44313.
---
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|
t-algebraic-geometry |
1/0 |
Mathlib/AlgebraicGeometry/EffectiveEpi.lean |
1 |
1 |
['JX-Mo', 'github-actions'] |
riccardobrasca assignee:riccardobrasca |
1-6097 1 day ago |
16-66164 16 days ago |
16-66157 16 days |
0 |
| 44356 |
seewoo5 author:seewoo5 |
feat(ModularForms/SlashActions): more theorems for slash actions (sub,pow,zpow,inv) |
---
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Add `SlashAction.sub_slash` and `{zpow/inv/pow}_slash{_SL2}`. Found while refactoring some code in sphere packing project. Golfed using Claude. |
t-number-theory
sphere-packing
|
34/0 |
Mathlib/NumberTheory/ModularForms/SlashActions.lean |
1 |
6 |
['CBirkbeck', 'github-actions', 'seewoo5'] |
loefflerd assignee:loefflerd |
1-6095 1 day ago |
16-50244 16 days ago |
16-50237 16 days |
0 |
| 42912 |
justin-palumbo author:justin-palumbo |
feat(Topology/GDelta): a completely metrizable subspace of a T6 space is Gδ |
Adds TopologicalSpace.IsCompletelyMetrizableSpace.isGδ: a completely metrizable subspace of a T6 space is Gδ
This is one direction of a foundational fact in descriptive set theory --- the Polish subspaces of a Polish space are exactly the Gδ subsets.
The proof here is modeled on the exposition in Anush Tserunyan's descriptive set theory notes https://www.math.mcgill.ca/atserunyan/Teaching_notes/dst_lectures.pdf, with one adjustment; to make the formalization easier and avoid having multiple distance metrics instantiated at the same time, instead of directly defining open `U_n` with `s = ⋂ n, U` define them such that `s = closure s ∩ ⋂ n, U n` and then appeal to the fact closed sets are Gδ in a perfectly normal space.
---
- [x] depends on: #42896 [which fixes buggy naming present in Topology/Metrizable/CompletelyMetrizable]
This can be viewed as a companion to #42693, which - under the stronger assumption of the ambient space being Polish - establishes the other direction --- a Gδ subspace of a Polish space is itself Polish.
Together, these give Alexandrov's theorem, characterizing the Polish subspaces of an ambient Polish space as exactly the Gδ ones, and (via `Metric.PiNatEmbed.exists_embedding_to_hilbert_cube`) Polish spaces as exactly the Gδ subsets of the Hilbert cube. If and when both these PRs are committed, I anticipate adding these consequences to Topology/MetricSpace/Polish.lean
LLM usage: I wrote the initial version myself, while using Google's free "AI mode" to help me find relevant lemma names in the codebase, and afterward used helped Claude Opus to review, which led to simplifying some of the arguments. I take full responsibility for the code here
|
t-topology
new-contributor
|
91/0 |
Mathlib.lean,Mathlib/Topology/GDelta/CompletelyMetrizable.lean |
2 |
8 |
['github-actions', 'justin-palumbo', 'mathlib-dependent-issues', 'plp127'] |
nobody |
1-5200 1 day ago |
58-49284 58 days ago |
58-49574 58 days |
0 |
| 43113 |
themathqueen author:themathqueen |
feat(Topology/Algebra/Module/Spaces/CLM): linear map version of `smulRightL` |
This is the linear map version of `smulRightL` that can be used for non-normed spaces.
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|
t-topology |
20/1 |
Mathlib/Analysis/Normed/Operator/Bilinear.lean,Mathlib/Topology/Algebra/Module/Spaces/ContinuousLinearMap.lean |
2 |
1 |
['github-actions'] |
nobody |
1-5199 1 day ago |
52-25479 52 days ago |
52-25645 52 days |
1 |
| 41347 |
mkaratarakis author:mkaratarakis |
feat(Tactic/Polynomial): poly_dvd_cert, certificate-based polynomial divisibility |
The `poly_dvd_cert` tactic: prove `p ∣ q` for `Polynomial K` polyrith-style - search the quotient uncertified in compiled `MetaM` (pseudo-division, so the certified identity is division-free), then verify with `ring` and cancel the leading-coefficient unit. Works over any field with concrete or symbolic coefficients, for monic divisors over any commutative ring, and for unit leading coefficients.
|
t-meta
LLM-generated
|
303/0 |
Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ComputablePolynomial/DvdCert.lean,MathlibTest/ComputablePolynomial/PolyDvdCert.lean |
4 |
8 |
['JovanGerb', 'eric-wieser', 'github-actions', 'mkaratarakis'] |
nobody |
1-5197 1 day ago |
22-30867 22 days ago |
84-60725 84 days |
0 |
| 41920 |
junjihashimoto author:junjihashimoto |
feat(Analysis/CliffordAlgebra): the pseudoscalar of Cl(n,0) and its complex structure |
We study the Clifford algebra of Euclidean `n`-space (the quadratic form `x ↦ ⟪x, x⟫_ℝ` on `EuclideanSpace ℝ (Fin n)`). The pseudoscalar `ω = e₀ ⋯ eₙ₋₁` satisfies
* `ω * ω = (-1) ^ (n.choose 2)` (`pseudoscalar_mul_pseudoscalar'`),
* `γᵢ * ω = (-1) ^ (n - 1) • (ω * γᵢ)` (`γ_mul_pseudoscalar`),
so it is central for odd `n`, and a square root of `-1` iff `n ≡ 2, 3 [MOD 4]`. In that case left multiplication by `ω` is a complex structure: we provide a scoped `Module ℂ` instance (via `Complex.liftAux` and `Module.compHom`; no commutation is needed for a module structure, which covers the non-central case `n ≡ 2 [MOD 4]`), and for `n ≡ 3 [MOD 4]` an `Algebra ℂ` structure as a non-instance def.
The sign computations are done by moving a generator through a product of distinct generators (`γ_mul_prod`, `γ_mul_prod_mem`, `prod_sq`), with no case analysis on `n`.
In a follow-up PR this makes the Clifford–Fourier transform (Ebling–Scheuermann) an instance of the ordinary vector-valued Fourier transform, giving Plancherel's theorem and the inversion formula.
- [ ] depends on: (nothing)
|
t-analysis
new-contributor
|
303/0 |
Mathlib.lean,Mathlib/Analysis/CliffordAlgebra/Euclidean.lean |
2 |
5 |
['eric-wieser', 'github-actions', 'j-loreaux'] |
nobody |
1-5196 1 day ago |
89-53554 89 days ago |
89-54047 89 days |
1 |
| 44850 |
mcdoll author:mcdoll |
feat(Analysis/LocallyConvex): asymptotics for LCTVS and normed spaces |
Two simple lemmas for asymptotics in TVS and normed spaces.
Had to add `simp` tags and simplify some of the downstream code.
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|
t-analysis |
68/14 |
Mathlib/Analysis/Asymptotics/Arith.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/Complex/ValueDistribution/FirstMainTheorem.lean,Mathlib/Analysis/LocallyConvex/Asymptotics.lean,Mathlib/Analysis/Polynomial/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean |
8 |
1 |
['github-actions'] |
nobody |
1-4675 1 day ago |
2-78368 2 days ago |
2-79950 2 days |
0 |
| 44920 |
plp127 author:plp127 |
feat(Algebra/CharP): `natCast_pow_expChar` |
Prove lemmas `natCast_pow_expChar` and `intCast_pow_expChar`. Also reorganize the `variable`s to be more consistent.
---
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|
t-algebra label:t-algebra$ |
44/14 |
Mathlib/Algebra/CharP/Lemmas.lean,Mathlib/Data/Nat/Choose/Lucas.lean,Mathlib/FieldTheory/PurelyInseparable/Exponent.lean |
3 |
1 |
['github-actions', 'vihdzp'] |
nobody |
1-4264 1 day ago |
1-24465 1 day ago |
1-25773 1 day |
1 |
| 43373 |
Parcly-Taxel author:Parcly-Taxel |
feat: `2 ^ n ≤ lcmUpto n` for `7 ≤ n` |
This proof is even more elementary than Nair's proof (_American Mathematical Monthly_ **89** (2), February 1982, 126–129). Inspired by [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Bounds.20of.20Chebyshev.20Functions/with/621120558).
Co-authored-by: Aristotle (Harmonic) <aristotle-harmonic@harmonic.fun>
The original Aristotle run is [here](https://aristotle.harmonic.fun/dashboard/requests/9fd88021-f5b1-4e7f-99fc-450d5edc9590).
We also add a slightly stronger lower bound on the prime-counting function based on the new result as `pi_ge_of_four_le`. |
t-number-theory
LLM-generated
|
73/16 |
Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Nat/Choose/Factorization.lean,Mathlib/NumberTheory/Chebyshev.lean |
3 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
loefflerd assignee:loefflerd |
1-2333 1 day ago |
31-100 31 days ago |
42-84674 42 days |
0 |
| 42380 |
matt-w-horn author:matt-w-horn |
feat(Algebra/Ring): add sum_range_mul_geometric_add |
Over a `CommRing`: `∑ k < m, k * (x ^ k * (1 - x)) + m * x ^ m = ∑ k ∈ Icc 1 m, x ^ k`. Summation by parts for the geometric sum; it computes the mean of a censored geometric distribution, which #42381 adds.
Used in Overload, a library on retry and overload dynamics, where it's stated over `ℝ` with a side condition that turns out to be unnecessary: https://github.com/matt-w-horn/overload/blob/4ecbebf/Overload/Retry/Amplification.lean
Claude Fable wrote the Lean from a spec I gave it. I reviewed and tested it myself, including adversarial tests and the suites in the library above, and did the same for its dependencies.
Assisted-by: Claude Fable 5 |
t-algebra
new-contributor
LLM-generated
label:t-algebra$ |
11/0 |
Mathlib/Algebra/Ring/GeomSum.lean |
1 |
7 |
['github-actions', 'matt-w-horn', 'themathqueen'] |
nobody |
1-1909 1 day ago |
1-2066 1 day ago |
64-71949 64 days |
0 |
| 44803 |
SnirBroshi author:SnirBroshi |
feat(Tactic/Linter/TextBased): lint against more characters in module names |
Instead of forbidding `<>"/\|?*` and whitespace, we forbid everything except for alphanumeric characters and `_`.
---
I checked `downstream_repos.yml` and all of them seem to comply except for SciLean with [`SciLean/Meta/Notation/Let'`](https://github.com/lecopivo/SciLean/blob/master/SciLean/Meta/Notation/Let'.lean), but they don't run this linter in CI. Also the Mathlib convention is a `Prime` suffix instead of `'`.
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|
t-linter |
36/41 |
Mathlib/Tactic/Linter/TextBased.lean,MathlibTest/Linter/ForbiddenModuleNames.lean |
2 |
2 |
['github-actions', 'vihdzp'] |
nobody |
1-1565 1 day ago |
1-2200 1 day ago |
1-2743 1 day |
0 |
| 42355 |
sankalpsthakur author:sankalpsthakur |
fix(NormNum): error if remaining at locations are unused |
`norm_num at h1 h2 ...` (and other tactics built on `Lean.Elab.Tactic.withNondepPropLocation`) unconditionally processed every hypothesis in the location list, then the target. If an earlier hypothesis closed the goal (e.g. `norm_num` found `h1` to already be `False`), processing continued against an already-closed goal instead of stopping.
Unused `at` locations now error if an earlier location closed the goal.
Closes #28703.
---------
Note. `withNondepPropLocation` currently has no other callers in the Mathlib tree besides its own definition file.
AI coding tools were used to help draft this change and PR description. I reviewed the complete change, understand the reasoning, and verified the build locally before submitting. |
new-contributor
LLM-generated
t-meta
maintainer-merge
|
32/2 |
Mathlib/Util/AtLocation.lean,MathlibTest/Tactic/NormNum/Basic.lean |
2 |
25 |
['github-actions', 'grunweg', 'joneugster', 'mathlib-merge-conflicts', 'sankalpsthakur', 'thorimur'] |
joneugster assignee:joneugster |
0-65782 18 hours ago |
34-72852 34 days ago |
54-74121 54 days |
0 |
| 41306 |
vlad902 author:vlad902 |
feat(SimpleGraph): reduce CycleGraph imports |
Reduce the imports for CycleGraph.lean and re-prove and move a few lemmas around as a result.
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics
maintainer-merge
|
46/31 |
Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/CycleGraph.lean,Mathlib/Combinatorics/SimpleGraph/Hasse.lean |
4 |
33 |
['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vlad902'] |
SnirBroshi assignee:SnirBroshi |
0-65331 18 hours ago |
3-25758 3 days ago |
100-17268 100 days |
0 |
| 44569 |
JovanGerb author:JovanGerb |
fix(Tactic/CategoryTheory/Slice): do not generate redundant goals |
This PR fixes the `slice`/`slice_lhs`/`slice_rhs` tactics to not generate goals other than the intended one. The fix to use the `lhs` and `rhs` conv mode tactics instead of `congr` (which generates multiple goals).
This is a step towards supporting the multiGoal linter in `conv` mode, but is also a nice fix on its own.
---
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|
t-meta
maintainer-merge
|
31/10 |
Mathlib/Tactic/CategoryTheory/Slice.lean,MathlibTest/CategoryTheory/Slice.lean |
2 |
4 |
['github-actions', 'joneugster'] |
joneugster assignee:joneugster |
0-65090 18 hours ago |
5-9345 5 days ago |
7-81191 7 days |
0 |
| 42225 |
matt-w-horn author:matt-w-horn |
feat(Order): Knaster–Tarski fixed points on an interval |
`lfpIcc f a b` and `gfpIcc f a b`: least and greatest fixed points of `f` on `Set.Icc a b` in a conditionally complete lattice, for `f` monotone on the interval and mapping it into itself. Also interval membership, endpoint-iterate bounds, and monotonicity in `f`.
`OrderHom.lfp` gives this through the complete-lattice instance on the subtype, but wants a `Fact (a ≤ b)` and returns subtype elements. These take `MonotoneOn` and `MapsTo` directly and stay in `α`. Bridge lemmas between the two are a follow-up.
Used on intervals of ℝ in Overload, a sorry-free Lean library on retry and overload dynamics: https://github.com/matt-w-horn/overload/tree/main/Overload
Claude Fable wrote the Lean from a spec I gave it. I reviewed and tested it myself, including adversarial tests and the suites in the library above, and did the same for its dependencies.
Assisted-by: Claude Fable 5 |
t-order
new-contributor
LLM-generated
|
166/0 |
Mathlib.lean,Mathlib/Order/FixedPointsIcc.lean |
2 |
7 |
['github-actions', 'matt-w-horn', 'wwylele'] |
nobody |
0-64928 18 hours ago |
75-5055 75 days ago |
75-5048 75 days |
0 |
| 44817 |
luigi-massacci author:luigi-massacci |
doc(workflows): remove stale cross-reference list |
The idea is to centralize references to just the main doc page for cross-references, as opposed to having to maintain the list of external databases up to date in many places. This has already been implemented in other docs / module headers.
Part of a sequence of PRs about CI for cross-references.
---
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|
documentation
CI
easy
maintainer-merge
|
1/1 |
docs/workflows.md |
1 |
3 |
['github-actions', 'joneugster'] |
nobody |
0-64471 17 hours ago |
3-72686 3 days ago |
3-72679 3 days |
1 |
| 44745 |
vihdzp author:vihdzp |
doc(SetTheory/Cardinality/Cofinality/Club): improve documentation |
We add tags to the file, and specify the uncountability condition in the docstring for Fodor's lemma.
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|
documentation
t-set-theory
easy
maintainer-merge
|
7/3 |
Mathlib/SetTheory/Cardinal/Cofinality/Club.lean |
1 |
2 |
['github-actions', 'joneugster'] |
nobody |
0-64386 17 hours ago |
5-76193 5 days ago |
5-76186 5 days |
0 |
| 41988 |
vlad902 author:vlad902 |
feat(FreeGroup): characterize commutative/cyclic free groups |
Characterize cyclic/commutative free groups as being those on ≤ 1 generators. I generalize and move around some instances along the way to avoid new imports.
---
- [x] depends on: #44473
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|
t-group-theory
maintainer-merge
|
41/8 |
Mathlib/Basic/Unique.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/FreeGroup/Reduce.lean |
3 |
21 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'tb65536', 'vlad902'] |
nobody |
0-61360 17 hours ago |
6-51200 6 days ago |
62-58678 62 days |
1 |
| 44929 |
vihdzp author:vihdzp |
refactor: `isUpperSet_Ixi` → `IsUpperSet.Ixi` |
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As suggested by @YaelDillies in #39747.
|
maintainer-merge
t-order
|
39/29 |
Mathlib/Data/Nat/Cast/SetInterval.lean,Mathlib/Order/DirSupClosed.lean,Mathlib/Order/DirectedInverseSystem.lean,Mathlib/Order/IsNormal.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/Order/UpperLower/Fibration.lean,Mathlib/Order/UpperLower/Principal.lean,Mathlib/RingTheory/MvPolynomial/Ideal.lean,Mathlib/Topology/Order/IsNormal.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/Order/ScottTopology.lean |
11 |
2 |
['YaelDillies', 'github-actions', 'grunweg'] |
nobody |
0-58861 16 hours ago |
0-65790 18 hours ago |
0-65783 18 hours |
2 |
| 44930 |
vihdzp author:vihdzp |
feat: non-zero zero-one measure is probability measure |
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|
t-measure-probability |
15/6 |
Mathlib/MeasureTheory/Measure/Typeclasses/ZeroOne.lean,Mathlib/Probability/Kernel/Deterministic.lean |
2 |
1 |
['github-actions'] |
nobody |
0-57709 16 hours ago |
0-58314 16 hours ago |
0-58386 16 hours |
0 |
| 44594 |
xroblot author:xroblot |
chore(NumberTheory/NumberField): remove a redundant Finite instance |
The instance giving `Finite (𝓞 K ⧸ I)` for `I` maximal is now found automatically, through `RingOfIntegers.instNeZeroIdealOfIsMaximal` and the instance of `Ring.HasFiniteQuotients` saying that a quotient by a nonzero ideal is finite.
|
t-number-theory
maintainer-merge
|
0/3 |
Mathlib/NumberTheory/NumberField/Ideal/Basic.lean |
1 |
4 |
['github-actions', 'leanprover-radar', 'tb65536', 'xroblot'] |
nobody |
0-57129 15 hours ago |
9-54627 9 days ago |
9-54620 9 days |
0 |
| 43683 |
mariainesdff author:mariainesdff |
feat(RingTheory/Valuation/ValuativeRel/Basic): add IsEquiv lemmas |
Co-authored-by: @xgenereux
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|
t-ring-theory |
10/1 |
Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean |
1 |
5 |
['github-actions', 'jjdishere', 'mariainesdff', 'mathlib-merge-conflicts'] |
nobody |
0-55877 15 hours ago |
0-56695 15 hours ago |
15-77204 15 days |
4 |
| 44902 |
leomayer1 author:leomayer1 |
chore(CategoryTheory/Shift): change notation to notation3 for better pretty printing |
In current master, `#check shiftAdd` for example yields
```
CategoryTheory.shiftAdd.{v, u, u_1} {C : Type u} {A : Type u_1} [Category.{v, u} C] [AddMonoid A] [HasShift C A] (X : C)
(i j : A) : (shiftFunctor C (i + j)).obj X ≅ (shiftFunctor C j).obj ((shiftFunctor C i).obj X)
```
This PR changes it to the more readable
```
CategoryTheory.shiftAdd.{v, u, u_1} {C : Type u} {A : Type u_1} [Category.{v, u} C] [AddMonoid A] [HasShift C A] (X : C)
(i j : A) : X⟦i + j⟧ ≅ X⟦i⟧⟦j⟧
```
---
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|
t-category-theory
new-contributor
easy
|
2/2 |
Mathlib/CategoryTheory/Shift/Basic.lean |
1 |
3 |
['github-actions', 'leomayer1'] |
nobody |
0-55851 15 hours ago |
0-56668 15 hours ago |
0-56661 15 hours |
0 |
| 38369 |
quantumsnow author:quantumsnow |
feat(AlgebraicTopology): Eilenberg Steenrod axioms |
This introduces the Eilenberg-Steenrod axioms for a homology theory.
---
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|
new-contributor
t-algebraic-topology
large-import
increases-technical-debt
|
258/18 |
Mathlib/AlgebraicTopology/EilenbergSteenrod.lean,Mathlib/Topology/Category/TopPair.lean |
2 |
115 |
['Multramate', 'chrisflav', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'quantumsnow'] |
robin-carlier assignee:robin-carlier |
0-55131 15 hours ago |
0-55131 15 hours ago |
76-37920 76 days |
0 |
| 44442 |
aebrose author:aebrose |
feat(LinearAlgebra/LinearIndependent/Basic): scaling by right-regular elements preserves linear independence |
Add `LinearIndependent.smul_of_isRightRegular` which says that a linearly independent family stays linearly independent when scaling with right regular elements.
This generalizes `LinearIndependent.units_smul` which is the same statement for units instead of right-regular elements. The proof of `LinearIndependent.units_smul` is updated using the right-regular version.
---
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|
t-algebra
new-contributor
maintainer-merge
label:t-algebra$ |
12/6 |
Mathlib/LinearAlgebra/LinearIndependent/Basic.lean |
1 |
6 |
['aebrose', 'github-actions', 'tb65536', 'vlad902'] |
nobody |
0-54490 15 hours ago |
2-14357 2 days ago |
6-64580 6 days |
0 |
| 44286 |
user202729 author:user202729 |
chore(Algebra/Group): use normal typeclass syntax for `Normal` |
Use the normal syntax to make `Normal` a typeclass instead of `attribute [class] Normal`.
This affects the proofs depending on this typeclass by making the member accessor `conj_mem` taking the `Normal` instance as an instance-implicit argument instead of an explicit one. They were refactored by simply letting the compiler infer the instance, which it always succeeds for the cases found in mathlib.
---
More discussion: Another effect of using `class` instead of `structure` is that the `‹…›` syntax cannot be used, however, for this specific typeclass it is not affected. It affects `Unique` though (not touched here). |
new-contributor
t-group-theory
maintainer-merge
|
7/11 |
Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/Topology/Algebra/Group/Subgroup.lean |
6 |
7 |
['github-actions', 'mathlib-merge-conflicts', 'tb65536', 'user202729'] |
nobody |
0-54391 15 hours ago |
5-72001 5 days ago |
16-67180 16 days |
0 |
| 44443 |
plp127 author:plp127 |
feat(Topology/Algebra/IsUniformGroup): group is left/right uniform group iff it's equal to left/right uniformity |
Prove that for a topological group `G` with a uniform space structure, `G` is a left/right uniform group iff the uniformity is equal to `IsTopologicalGroup.leftUniformSpace G`/`IsTopologicalGroup.rightUniformSpace G`.
Also rename `uniformity_eq_comap_nhds_one'` to `uniformity_eq_comap_nhds_one_right` to match `uniformity_eq_comap_nhds_one_left`.
---
- [x] depends on: #44423
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|
t-topology
t-group-theory
|
61/25 |
Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Topology/Algebra/IsUniformGroup/Basic.lean,Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean,Mathlib/Topology/Algebra/Module/Multilinear/Topology.lean,Mathlib/Topology/Algebra/Module/Spaces/UniformConvergenceCLM.lean |
5 |
2 |
['github-actions', 'mathlib-dependent-issues'] |
nobody |
0-54277 15 hours ago |
0-59728 16 hours ago |
0-60021 16 hours |
1 |
| 44808 |
homeowmorphism author:homeowmorphism |
chore(GroupTheory/Generators,Presentation): use short names inside namespace |
* Use `Generators` instead of `Group.Generators` and `Presentation` instead of `Group.Presentation`.
* Add the `Group` namespace so that `Group.fg_iff_nonempty_finite_generators` becomes `fg_iff_nonempty_finite_generators`.
---
I noticed these issues while writing a new API result, and had Claude prepare the PR for me.
🤖 Generated with [Claude Code](https://claude.com/claude-code) |
t-group-theory
easy
maintainer-merge
|
35/27 |
Mathlib/GroupTheory/Generators.lean,Mathlib/GroupTheory/Presentation.lean |
2 |
4 |
['github-actions', 'homeowmorphism', 'tb65536'] |
nobody |
0-54156 15 hours ago |
4-18552 4 days ago |
4-18545 4 days |
0 |
| 43216 |
JadAbouHawili author:JadAbouHawili |
feat(Combinatorics/SimpleGraph/Clique): independence number is zero iff the graph has no vertices |
---
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new-contributor
t-combinatorics
|
46/3 |
Mathlib/Combinatorics/SimpleGraph/Clique.lean |
1 |
45 |
['JadAbouHawili', 'SnirBroshi', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
0-53858 14 hours ago |
41-33367 41 days ago |
45-9550 45 days |
0 |
| 44918 |
plp127 author:plp127 |
feat(Algebra/CharP/Subring): generalize |
Generalize some instances from concrete subfoos to arbitrary `SubsemiringClass`, and provide an instance `SubsemiringClass.expChar`.
---
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|
t-algebra label:t-algebra$ |
28/28 |
Mathlib/Algebra/CharP/Subring.lean,Mathlib/FieldTheory/JacobsonNoether.lean,Mathlib/RingTheory/Perfection.lean |
3 |
7 |
['github-actions', 'leanprover-radar', 'plp127', 'vihdzp'] |
nobody |
0-53782 14 hours ago |
1-24006 1 day ago |
1-24113 1 day |
0 |
| 44771 |
JovanGerb author:JovanGerb |
feat(Linter/UnusedTactic): improve warning message |
This PR lets the unused tactic linter emit a different error message based on whether the tactic is never executed, or if it is executed but it didn't change the goal.
---
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|
t-linter
maintainer-merge
|
53/55 |
Mathlib/Tactic/Linter/UnusedTactic.lean,MathlibTest/Linter/UnusedTactic.lean,MathlibTest/TacticAnalysis.lean |
3 |
4 |
['JovanGerb', 'github-actions', 'joneugster'] |
nobody |
0-52090 14 hours ago |
5-40998 5 days ago |
5-40991 5 days |
1 |
| 44718 |
vihdzp author:vihdzp |
feat: finite index subgroups of ℤ biject with ℕ+ |
This will be used to justify the construction of `ZHat` as sequences `Π n : ℕ+, ZMod n`.
---
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This material is only used for the profinite completion of groups, which is already quite deep in the import chain, so I think this import increase is fine.
The increase in tech debt is due to the fact that `ℕ+` does not have its own constructor, and instead reuses that of `Subtype`, which causes type mismatches. The solution, outside of the scope of this PR, would be to create a `PNat.mk` constructor, or to make `ℕ+` an abbrev. |
large-import
increases-technical-debt
t-group-theory
|
94/18 |
Mathlib/Algebra/Group/Subgroup/ZPowers/Basic.lean,Mathlib/Algebra/Order/Group/Cyclic.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/FiniteIndexNormalSubgroup.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/GroupTheory/ResiduallyFinite.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic/Subgroup.lean,Mathlib/NumberTheory/ModularForms/Cusps.lean,Mathlib/Topology/Algebra/Order/ArchimedeanDiscrete.lean,Mathlib/Topology/Instances/AddCircle/DenseSubgroup.lean |
11 |
7 |
['JX-Mo', 'github-actions', 'leanprover-radar', 'tb65536', 'vihdzp'] |
nobody |
0-51489 14 hours ago |
5-82307 5 days ago |
6-590 6 days |
0 |
| 44934 |
CollinYuanjieRen author:CollinYuanjieRen |
fix(linter): ignore declaration names in flexible linter |
Skip the declaration name when collecting stained locations from `letIdDecl`. This prevents `simp at h; let h := 3` (and the corresponding `have`) from being reported as a use of the old `h`, while preserving warnings for references in the declaration type or right-hand side.
Addresses the third example in #32257. Includes six regression cases.
---
Validation: `MathlibTest/Linter/Flexible/Basic.lean` passes on Lean 4.35.0. With the original implementation, the two new shadowing cases fail; the four true-reference controls pass.
AI assistance: Codex assisted with the fix and regression tests.
|
t-linter
LLM-generated
new-contributor
|
74/0 |
Mathlib/Tactic/Linter/FlexibleLinter.lean,MathlibTest/Linter/Flexible/Basic.lean |
2 |
3 |
['CollinYuanjieRen', 'github-actions'] |
nobody |
0-51247 14 hours ago |
0-53907 14 hours ago |
0-53900 14 hours |
0 |
| 44665 |
smmercuri author:smmercuri |
refactor: use unscoped completion algebra for infinite places |
- Move `scoped instances` over to a `def` and a theorem giving uniqueness of algebras under compatibility criteria
- Deprecate `LiesOverInstances.lean`
---
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|
t-number-theory
large-import
|
127/74 |
Mathlib/NumberTheory/NumberField/Completion/InfinitePlace.lean,Mathlib/NumberTheory/NumberField/Completion/LiesOverInstances.lean,Mathlib/NumberTheory/NumberField/Completion/Ramification.lean |
3 |
4 |
['github-actions', 'smmercuri', 'tb65536'] |
tb65536 assignee:tb65536 |
0-50536 14 hours ago |
7-56619 7 days ago |
7-57191 7 days |
0 |
| 41348 |
mkaratarakis author:mkaratarakis |
feat(ComputablePolynomial): define MvDegrees, exponent vectors for multivariate polynomials |
`MvDegrees nvars` is an exponent vector for a monomial in `nvars` variables: an array of per-variable exponents with its cached total degree, with pointwise addition (`AddCommMonoid`) and the `List`/`Array` folding lemmas the computable multivariate polynomial library (`MvSparsePoly`) is built on. The proofs were done with the help of Claude.
Based on the univariate `SparsePoly` (#41339); started by Mario Carneiro at the Hausdorff Institute (June 2024) with design notes and an original Lean prototype by James Davenport (https://github.com/JamesHDavenport/Dagstuhl23401, `verify-irred/VerifyIrred`).
|
t-meta |
301/0 |
Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ComputablePolynomial/MvDegrees.lean |
3 |
2 |
['github-actions'] |
thorimur assignee:thorimur |
0-50479 14 hours ago |
0-51161 14 hours ago |
32-553 32 days |
8 |
| 44721 |
mycaule author:mycaule |
feat(Geometry/Euclidean/Projection): distance to a hyperplane via its normal vector |
Add the closed formula for the distance from a point to an affine hyperplane given by a normal vector, stated in the Euclidean-geometry normal form (distance to the orthogonal projection):
```lean
theorem EuclideanGeometry.dist_orthogonalProjection_eq_abs_inner_div_norm
(s : AffineSubspace ℝ P) [Nonempty s] [s.direction.HasOrthogonalProjection]
{n : V} (hn : s.directionᗮ = ℝ ∙ n) {q : P} (hq : q ∈ s) (p : P) :
dist p (orthogonalProjection s p) = |⟪n, p -ᵥ q⟫| / ‖n‖
```
Proof: `p -ᵥ orthogonalProjection s p = t • n` since it lies in `s.directionᗮ = ℝ ∙ n`, and `⟪n, p -ᵥ q⟫ = ⟪n, t • n⟫` because `orthogonalProjection s p -ᵥ q ∈ s.direction` is orthogonal to `n`. No hypothesis `n ≠ 0` is needed. The `Metric.infDist` form follows from `dist_orthogonalProjection_eq_infDist`.
As a corollary, without any new definition (the plane through `q` with normal vector `n` is `AffineSubspace.mk' q (ℝ ∙ n)ᗮ`):
```lean
theorem EuclideanGeometry.dist_orthogonalProjection_mk'_eq_abs_inner_div_norm (q : P) (n : V) (p : P) :
dist p (orthogonalProjection (AffineSubspace.mk' q (ℝ ∙ n)ᗮ) p) = |⟪n, p -ᵥ q⟫| / ‖n‖
```
together with an instance `(AffineSubspace.mk' q K).direction.HasOrthogonalProjection` for `K.HasOrthogonalProjection` (as for `perpBisector`). This adds a (non-public) import of `Mathlib.Analysis.InnerProductSpace.Projection.Submodule` for `Submodule.orthogonal_orthogonal`.
Context: this is the distance from a point to a plane `ax + by + cz + d = 0` as taught in the French high-school curriculum, `|ax₀ + by₀ + cz₀ + d| / √(a² + b² + c²)`.
AI disclosure: the statement and proof were drafted with Claude (Claude Code) and checked by compiling against Mathlib; I have reviewed them.
---
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
t-euclidean-geometry
new-contributor
LLM-generated
|
37/2 |
Mathlib/Geometry/Euclidean/Projection.lean |
1 |
18 |
['github-actions', 'jsm28', 'mycaule', 'vihdzp', 'wwylele'] |
jsm28 assignee:jsm28 |
0-49692 13 hours ago |
6-5518 6 days ago |
6-5511 6 days |
0 |
| 44727 |
mycaule author:mycaule |
feat(CategoryTheory/Monad/Monadicity): state the (co)monadicity theorem as an iff |
Add:
`Monad.isEquivalence_comparison_iff`: for `adj : F ⊣ G`, `(Monad.comparison adj).IsEquivalence` iff `G` reflects isomorphisms and, for every `G`-split pair `u, v`, `HasCoequalizer u v` and `PreservesColimit (parallelPair u v) G`
`Comonad.isEquivalence_comparison_iff`: the dual statement
instances `Monad.reflectsIsomorphisms_of_monadicRightAdjoint` and `Comonad.reflectsIsomorphisms_of_comonadicLeftAdjoint` (priority 100)
The forward direction uses `createsGSplitCoequalizersOfMonadic` (resp. `createsFSplitEqualizersOfComonadic`). The backward direction is `monadicOfHasPreservesGSplitCoequalizersOfReflectsIsomorphisms` (resp. its dual). The module docstrings list the new statements.
Mathlib has the backward direction as the definitions `monadicOfHasPreservesGSplitCoequalizersOfReflectsIsomorphisms` and `comonadicOfHasPreservesFSplitEqualizersOfReflectsIsomorphisms`, and the forward ingredients `createsGSplitCoequalizersOfMonadic` and `createsFSplitEqualizersOfComonadic`, but no iff.
Questions for reviewers: whether the instances belong in `Monad/Adjunction.lean` next to `MonadicRightAdjoint`; whether to state the iff with the existing classes `HasCoequalizerOfIsSplitPair` / `PreservesColimitOfIsSplitPair` instead of the explicit `∀`.
AI disclosure: the Lean proof was written by an AI model (Claude, Anthropic) under my direction. I have read and checked it and will handle the review. It builds against current master.
|
new-contributor
t-category-theory
LLM-generated
|
55/0 |
Mathlib/CategoryTheory/Monad/Comonadicity.lean,Mathlib/CategoryTheory/Monad/Monadicity.lean |
2 |
2 |
['github-actions'] |
robin-carlier assignee:robin-carlier |
0-49651 13 hours ago |
5-61368 5 days ago |
5-61361 5 days |
0 |
| 44726 |
mycaule author:mycaule |
feat(CategoryTheory/Idempotents/FunctorExtension): additive functors on the Karoubi envelope |
Add to `Mathlib/CategoryTheory/Idempotents/FunctorExtension.lean`:
`Karoubi.hom_eq_decompId_i_comp`: every morphism of `Karoubi C` is `P.decompId_i ≫ (toKaroubi C).map f.f ≫ Q.decompId_p`
`additive_of_toKaroubi_comp`, `additive_iff_toKaroubi_comp`: for `C`, `D` preadditive, `F : Karoubi C ⥤ D` is additive iff `toKaroubi C ⋙ F` is
`whiskeringLeftToKaroubiAdditive C D : (Karoubi C ⥤+ D) ⥤ (C ⥤+ D)`, fully faithful (`whiskeringLeftToKaroubiAdditiveFullyFaithful`), and an equivalence when `D` is idempotent complete
`karoubiUniversalAdditive C D : C ⥤+ D ≌ Karoubi C ⥤+ D`
This is the additive form of the universal property of the idempotent completion. Applied to `Cᵒᵖ`, it says that additive presheaves on `C` and on `Karoubi C` agree (Morita invariance), with values in any idempotent-complete preadditive category, e.g. `ModuleCat R`.
Mathlib has `karoubiUniversal C D : (C ⥤ D) ≌ (Karoubi C ⥤ D)` for idempotent-complete `D`, but not its restriction to additive functors.
Questions for reviewers: names (`whiskeringLeftToKaroubiAdditive`, `karoubiUniversalAdditive`); whether to also add `Karoubi.opEquivalence : Karoubi Cᵒᵖ ≌ (Karoubi C)ᵒᵖ` (compatible with `toKaroubi` on the nose) here or in a separate PR.
AI disclosure: the Lean proof was written by an AI model (Claude, Anthropic) under my direction. I have read and checked it and will handle the review. It builds against current master.
|
new-contributor
t-category-theory
LLM-generated
|
67/0 |
Mathlib/CategoryTheory/Idempotents/FunctorExtension.lean |
1 |
2 |
['github-actions'] |
dagurtomas assignee:dagurtomas |
0-49599 13 hours ago |
5-61328 5 days ago |
5-61321 5 days |
0 |
| 44936 |
JovanGerb author:JovanGerb |
feat(ClickSuggestions): use a `cdot` to focus the tactic when appropriate |
This PR changes the tactic script generated by `#click_suggestions` to include a focus dot (`·`) if either
- There are multiple goals and the user selected the first one.
- There is only one goal but the preceding tactic is a tactic sequence that was focused with a `·`.
This is to conform to the style that mathlib proofs typically have.
Unfortunately, it's not possible to add a test for the second condition, because the "preceding tactic" depends on the user's cursor position.
---
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|
t-meta |
12/6 |
Mathlib/Tactic/ClickSuggestions.lean,Mathlib/Tactic/ClickSuggestions/Util.lean,MathlibTest/ClickSuggestions/Test.lean,MathlibTest/ClickSuggestions/TestImpl.lean |
4 |
2 |
['JovanGerb', 'github-actions'] |
nobody |
0-48967 13 hours ago |
0-52061 14 hours ago |
0-52054 14 hours |
0 |
| 44941 |
CollinYuanjieRen author:CollinYuanjieRen |
feat(Data/Finset/Sort): add filtering and greatest insertion lemmas |
Prove that filtering commutes with `Finset.sort`, and that inserting a new greatest element appends it to the sorted list. Both lemmas work for general total, transitive, antisymmetric relations.
Continues the sorting portion of #9605 by @davikrehalt.
Codex (GPT-6 Astra) assisted with the Lean proofs.
|
t-data
LLM-generated
new-contributor
|
13/0 |
Mathlib/Data/Finset/Sort.lean |
1 |
3 |
['CollinYuanjieRen', 'github-actions'] |
nobody |
0-47935 13 hours ago |
0-49537 13 hours ago |
0-49530 13 hours |
0 |
| 44863 |
justus-springer author:justus-springer |
refactor(Analysis/Convex/Caratheodory): refactor Caratheodory's theorem using strong induction |
`convexHull_eq_union` (Caratheodory's theorem) was proved using `Caratheodory.minCardFinsetOfMemConvexHull`, a chosen finest of minimal cardinality whose convex hull contains `x`. I replace this with a direct proof using `Finset.strongInduction`. This makes `Caratheodory.minCardFinsetOfMemConvexHull` no longer necessary, hence it can become deprecated.
This does lose the functionality of getting a finest of minimal cardinality, but I don't think that should be needed anyway. The important point of the Caratheodory's theorem is that there exists an affinely independent subset.
I'm also doing a small golf in the proof of `eq_pos_convex_span_of_mem_convexHull` and replace `Sort (u + 1)` with `Type u`.
---
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|
t-analysis
maintainer-merge
|
59/52 |
Mathlib/Analysis/Convex/Caratheodory.lean |
1 |
2 |
['github-actions', 'tb65536'] |
nobody |
0-47648 13 hours ago |
2-51992 2 days ago |
2-51985 2 days |
0 |
| 44805 |
bryangingechen author:bryangingechen |
chore: link bors's dashboard at bors.mathlib.org |
This PR points the README's bors badge at bors's new address, https://bors.mathlib.org/repositories/16. It shows the same dashboard as the old address.
---
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
LLM-generated
easy
maintainer-merge
|
1/1 |
README.md |
1 |
2 |
['github-actions', 'tb65536'] |
nobody |
0-46944 13 hours ago |
4-29551 4 days ago |
4-29544 4 days |
0 |
| 44828 |
DanielJHorton author:DanielJHorton |
doc(LinearAlgebra/Contraction): fix typo in docstring for dualDistribEquiv |
Fix a small typo in the docstring of `dualDistribEquiv`.
---
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|
t-algebra
easy
maintainer-merge
label:t-algebra$ |
1/1 |
Mathlib/LinearAlgebra/Contraction.lean |
1 |
3 |
['DanielJHorton', 'JX-Mo', 'github-actions', 'tb65536'] |
nobody |
0-46903 13 hours ago |
3-42219 3 days ago |
3-42212 3 days |
0 |
| 44753 |
SnirBroshi author:SnirBroshi |
chore(RingTheory/IntegralClosure/IsIntegralClosure): fix instance name capitalization |
`integralClosure.AlgebraIsIntegral`
---
~~The first 'A' should be lowercase, but this name isn't used so removing it seems best.~~
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|
t-ring-theory
maintainer-merge
|
1/1 |
Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean |
1 |
7 |
['SnirBroshi', 'YaelDillies', 'eric-wieser', 'github-actions', 'tb65536'] |
nobody |
0-46324 12 hours ago |
3-68443 3 days ago |
5-17810 5 days |
0 |
| 44776 |
keithadler author:keithadler |
chore: use `Type*` in a few more places |
`Representation.norm_ofMulDistribMulAction_eq`, `Matrix.dualNumberEquiv` and `ValuativeRel.trivialRel` (with the lemmas about it) were stated for `Type`, although the definitions they use work in any universe. This uses `Type*`.
---
#44466 (an experiment) edits the `variable` line in `DualNumber.lean` as well.
Found with [lean-linter](https://github.com/keithadler/lean-linter). Prepared with AI assistance (Claude); I checked the change and the build.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
t-ring-theory
LLM-generated
new-contributor
maintainer-merge
|
2/2 |
Mathlib/RingTheory/Valuation/ValuativeRel/Trivial.lean |
1 |
11 |
['JX-Mo', 'Whysoserioushah', 'github-actions', 'grunweg', 'keithadler', 'mathlib-splicebot', 'tb65536'] |
nobody |
0-46254 12 hours ago |
5-36457 5 days ago |
5-36450 5 days |
0 |
| 44763 |
plp127 author:plp127 |
feat(RepresentationTheory/Character): remove `FiniteDimensional` assumption |
Provide an instance that the vector space of an irreducible representation is finite dimensional, and use that to remove some `FiniteDimensional` assumptions. Split off from #43899.
---
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|
t-algebra
maintainer-merge
label:t-algebra$ |
10/2 |
Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/Irreducible.lean |
2 |
6 |
['JX-Mo', 'github-actions', 'plp127', 'tb65536'] |
nobody |
0-45811 12 hours ago |
5-48634 5 days ago |
5-48627 5 days |
1 |
| 43363 |
BoltonBailey author:BoltonBailey |
feat(Data/Nat/Init): dvd_div_of_mul_dvd_right |
This PR adds `Nat.dvd_div_of_mul_dvd_right`, a version of `Nat.dvd_div_of_mul_dvd` with symmetry applied to the multiplication (we also make an alias of the latter to `dvd_div_of_mul_dvd_left` to mirror the API).
This PR was made with the assistance of Claude code, but I have reviewed it myself.
---
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[](https://gitpod.io/from-referrer/)
|
t-data
LLM-generated
maintainer-merge
|
8/1 |
Mathlib/Data/Nat/Init.lean |
1 |
2 |
['github-actions', 'joneugster'] |
joneugster assignee:joneugster |
0-44997 12 hours ago |
44-15793 44 days ago |
44-18753 44 days |
0 |
| 42588 |
sharky564 author:sharky564 |
fix(Tactic/Linarith): attribute `linarith?` suggestions to the correct hypotheses |
`runLinarith` returned indices into the post-preprocessing fact list, but `linarithUsedHyps` applies them to the pre-preprocessing hypothesis list, so `linarith?` could suggest the wrong hypotheses or fail outright. Fixed this by tagging each fact with the indices of the original hypotheses it was derived from (`TaggedProof`), threaded through all preprocessors.
---
This addresses and closes the issue raised in #41471.
This was broken because the old code passed indices of a list around, without updating when the list was modified by preprocessor dropped, split or synthesised facts. No index-fix could recover this, besides just carrying through the index. Keeping the `Origin` a set rather than a single index is necessary since preprocessors can combine hypotheses. However this does mean the preprocessors no longer act on `Expr`s but rather `TaggedProof`s - I'm not the greatest fan of this, but I couldn't come up with an easy solution that preserved this behaviour. I've also provided additional tests which highlight the issues that would've previously arisen.
AI disclosure:
I did have AI assistance (Claude Opus/Fable) with this, but this was for me to learn more Lean syntax not typically seen in writing proofs. The diagnosis and idea for the solution was mine, and debugging and documentation was with AI assistance.
[](https://gitpod.io/from-referrer/)
|
t-meta
LLM-generated
|
366/187 |
Mathlib/Tactic/Linarith/Datatypes.lean,Mathlib/Tactic/Linarith/Frontend.lean,Mathlib/Tactic/Linarith/NNRealPreprocessor.lean,Mathlib/Tactic/Linarith/Preprocessing.lean,MathlibTest/Tactic/Linarith/Basic.lean,MathlibTest/Tactic/Linarith/NNReal.lean |
6 |
13 |
['github-actions', 'kbuzzard', 'leanprover-radar', 'mathlib-merge-conflicts', 'sharky564'] |
nobody |
0-44865 12 hours ago |
15-35034 15 days ago |
60-797 60 days |
0 |
| 42297 |
xroblot author:xroblot |
feat(RingTheory/QuadraticAlgebra): trace, norm and discriminant as `Algebra` invariants |
Add a `RingTheory`-level file for `QuadraticAlgebra R a b`, identifying its elementary trace, norm and discriminant with the general `Algebra` ones on the standard basis `{1, ω}`.
Kept in a separate file so those stay free of the heavy `RingTheory.Discriminant` import.
---
- [x] depends on: #42708 |
t-ring-theory |
73/0 |
Mathlib.lean,Mathlib/RingTheory/QuadraticAlgebra.lean |
2 |
4 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
0-43793 12 hours ago |
31-43229 31 days ago |
31-63025 31 days |
4 |
| 44283 |
xroblot author:xroblot |
feat(NumberTheory/RamificationInertia): degrees of decomposition and inertia rings |
Let `B` be an extension of a ring `A` with Galois group `G`, let `P` be a prime ideal of `B` lying over a prime ideal `p` of `A`, and let `R`, `R'` be a decomposition ring and an inertia ring of `P`. This PR computes the degrees in the tower `A ⊆ R ⊆ R' ⊆ B` in terms of the ramification index of `p` in `B`, its inertia degree and the number of prime ideals of `B` lying over `p`.
Prepared with Claude Code 🤖
---
- [x] depends on: #44282
|
t-number-theory |
77/1 |
Mathlib/NumberTheory/RamificationInertia/HilbertTheory.lean |
1 |
3 |
['github-actions', 'mathlib-dependent-issues', 'tb65536'] |
tb65536 assignee:tb65536 |
0-43687 12 hours ago |
12-47255 12 days ago |
12-47594 12 days |
8 |
| 44698 |
xroblot author:xroblot |
refactor(RingTheory/Ideal/Norm): give `Ideal.absNorm` the junk value `0` at `⊥` |
The absolute norm of an ideal is now given the junk value `0` at the zero ideal. It is therefore no longer assumed that the ring is infinite, an assumption that was there to get `absNorm ⊥ = 0`.
Three lemmas unfold the norm: `Ideal.absNorm_of_ne_bot` for a nonzero ideal, with no further assumption, `Ideal.absNorm_apply` for every ideal of an infinite ring, both stated using `Submodule.cardQuot`, and `Ideal.absNorm_eq_natCard`, which is new, giving the same equality in the form `absNorm I = Nat.card (S ⧸ I)`.
The results of the file are restated for a ring with finite quotients in #42790, and the results downstream lose their infiniteness assumption in #44646.
Prepared with Claude Code 🤖
|
maintainer-merge |
71/38 |
Mathlib/NumberTheory/NumberField/ClassNumber.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Ideal.lean,Mathlib/NumberTheory/NumberField/Discriminant/Different.lean,Mathlib/NumberTheory/NumberField/Ideal/Basic.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/RamificationInertia/Inertia.lean |
6 |
6 |
['github-actions', 'tb65536', 'xroblot'] |
nobody |
0-43432 12 hours ago |
6-48677 6 days ago |
6-48670 6 days |
3 |
| 44801 |
keithadler author:keithadler |
chore(LinearAlgebra/RootSystem/WeylGroup): prove the three range lemmas from one |
`range_weylGroup_weightHom`, `range_weylGroup_coweightHom` and `range_weylGroupToPerm` each proved the same fact with their own ~20-line `Subgroup.closure_induction''` argument, differing only in the homomorphism and the simp lemma. This adds `range_weylGroup_domRestrict`, which says the image of the Weyl group under any homomorphism sending each reflection `i` to `g i` is `Subgroup.closure (range g)`, and proves the three from it. Their statements are unchanged and nothing else in Mathlib uses them. The file is 56 lines shorter, and `set_option backward.isDefEq.respectTransparency false` is no longer needed.
--------
The module builds and `lake exe runLinter` passes on it.
Found with [Lean Studio](https://github.com/keithadler/leanstudio)'s Find Similar Proofs. Prepared with AI assistance (Claude); I checked the change and the build.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
tech debt
t-algebra
LLM-generated
new-contributor
maintainer-merge
label:t-algebra$ |
15/72 |
Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean |
1 |
27 |
['Hagb', 'adomani', 'github-actions', 'grunweg', 'keithadler', 'themathqueen'] |
nobody |
0-42097 11 hours ago |
2-33011 2 days ago |
3-50645 3 days |
0 |
| 44690 |
vihdzp author:vihdzp |
feat: prime subfield as a finset |
We introduce `Subfield.botFinset F p`, which is the `Finset F` containing the prime subfield of the characteristic `p` field `F`. We use this to generalize various results that were previously stated only for `⊥ : Subfield F`.
---
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|
t-algebra label:t-algebra$ |
58/23 |
Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Finite/GaloisField.lean |
2 |
18 |
['artie2000', 'github-actions', 'plp127', 'tb65536', 'vihdzp'] |
nobody |
0-41220 11 hours ago |
0-54241 15 hours ago |
6-82245 6 days |
3 |
| 44691 |
vihdzp author:vihdzp |
refactor: move results about polynomial degrees outside of the `FiniteField` namespace |
They don't depend on the polynomial being over a finite field, at all.
---
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|
t-algebra
maintainer-merge
label:t-algebra$ |
67/81 |
Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Finite/Extension.lean,Mathlib/FieldTheory/Finite/GaloisField.lean,Mathlib/FieldTheory/Galois/NormalBasis.lean,Mathlib/FieldTheory/KummerPolynomial.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean |
7 |
7 |
['artie2000', 'github-actions', 'tb65536', 'vihdzp'] |
nobody |
0-40886 11 hours ago |
1-47124 1 day ago |
6-82686 6 days |
0 |
| 44921 |
plp127 author:plp127 |
feat(Algebra/Field/Subfield): `Subfield.isMulCommutative_closure` |
Prove that the subfield closure of commuting elements is commutative. Also rename the motive argument of `Subfield.closure_induction` to `motive`.
---
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|
t-algebra
maintainer-merge
label:t-algebra$ |
22/7 |
Mathlib/Algebra/Field/Subfield/Basic.lean |
1 |
10 |
['github-actions', 'plp127', 'themathqueen', 'vihdzp'] |
nobody |
0-40161 11 hours ago |
1-19214 1 day ago |
1-26379 1 day |
1 |
| 44853 |
dkaysin author:dkaysin |
feat(Geometry/Group): relate the word metric to the Cayley graph distance |
This PR constructs the Cayley graph (realized as a `SimpleGraph`) for a group `G` with respect to a generating family `P : Group.Generators G ι`, implements the link between walks in the Cayley graph and words, and establishes equivalence of the word metric and the distance on the Cayley graph.
---
Resolves TODO from [#43118](https://github.com/leanprover-community/mathlib4/pull/43118).
Implementation details:
* `SimpleGraph` was chosen vs `Quiver/Schreier` because it has a more comprehensive API at the moment. More context: [Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Relate.20the.20word.20metric.20to.20the.20distance.20in.20the.20Cayley.20graph/with/631376709).
* To accommodate possible future implementation for `Quiver/Schreier`, I've included "Simple" in the names of definitions and theorems (e.g., `cayleySimpleGraph`).
* Because simple graph has no loops, in several places we have to check that a letter/generator is not trivial.
Use of AI: I used Claude Opus 5.5 to help me with gathering context, designing API and implementation of several proofs.
* I used AI to brainstorm and compare API design ideas based on the context from previous Zulip threads and existing repo code.
* I used AI for suggesting parts of the proofs for `exists_walk_of_word` and `exists_word_of_walk` lemmas.
* I used AI for checking docstrings for consistency.
All AI-generated content was reviewed and edited by me.
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|
t-geometric-group-theory
new-contributor
LLM-generated
|
156/3 |
Mathlib.lean,Mathlib/Geometry/Group/CayleySimpleGraph.lean,Mathlib/Geometry/Group/README.md,Mathlib/Geometry/Group/WordMetric.lean |
4 |
4 |
['github-actions', 'tb65536'] |
nobody |
0-39546 10 hours ago |
2-63476 2 days ago |
2-63469 2 days |
0 |
| 44942 |
WenrongZou author:WenrongZou |
feat(MvPowerSeries/Substitution): add some lemmas about `HasSubst` |
In this PR, we add some lemmas about `HasSubst` for substitution of multivariate power series.
---
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|
t-ring-theory
tech debt
|
43/8 |
Mathlib/RingTheory/MvPowerSeries/Rename.lean,Mathlib/RingTheory/MvPowerSeries/Substitution.lean |
2 |
1 |
['github-actions'] |
nobody |
0-39368 10 hours ago |
0-40597 11 hours ago |
0-40590 11 hours |
0 |
| 44666 |
smmercuri author:smmercuri |
chore: split `RingTheory/DedekindDomain/AdicValuation.lean` into `AdicValuation/Valuation.lean` and `AdicValuation/Completion.lean` |
- The file has grown quite large so split the `HeightOneSpectrum.valuation` material away from the completion material
- Provides a more natural home for `NumberTheory/RamificationInertia/Valuation.lean`
---
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|
tech debt
maintainer-merge
|
1317/1269 |
Mathlib.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/RamificationInertia/Valuation.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation/Completion.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation/Ramification.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation/Valuation.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/RingTheory/DedekindDomain/GaussLemma.lean,Mathlib/RingTheory/DedekindDomain/SInteger.lean,Mathlib/RingTheory/DedekindDomain/SelmerGroup.lean,Mathlib/RingTheory/Valuation/Discrete/IsDiscreteValuationRing.lean |
14 |
2 |
['github-actions', 'tb65536'] |
nobody |
0-37813 10 hours ago |
7-57171 7 days ago |
7-57164 7 days |
3 |
| 44501 |
kim-em author:kim-em |
feat(Abel): warn about planned deprecation of transparency controls |
Warn whenever a bang form of `abel`, `abel1`, or `abel_nf` is used, and whenever the `red` configuration field of `abel_nf` is set explicitly or has a non-default value.
The warning says that these controls will be deprecated soon, directs users with a genuine use case to the dedicated [Zulip discussion](https://leanprover.zulipchat.com/#narrow/with/629213120), and documents `set_option warn.abelTransparency false` as an opt-out. Tests cover the warning and the opt-out.
---
This is the warning-first alternative to the competing removal PR #44500. |
t-meta |
57/5 |
Mathlib/Tactic/Abel.lean,MathlibTest/Linter/Flexible/ImportHeavy.lean,MathlibTest/Tactic/Abel.lean |
3 |
2 |
['github-actions'] |
nobody |
0-37705 10 hours ago |
12-4441 12 days ago |
12-4434 12 days |
0 |
| 44500 |
kim-em author:kim-em |
feat(Abel): remove unused transparency controls |
The bang forms of `abel`, `abel1`, and `abel_nf`, together with the `red` configuration field of `abel_nf`, have no known handwritten uses outside the tactic test suite. Remove support for them and make `.reducible` the fixed transparency mode.
The remaining `zetaDelta`, `contextual`, and normalization-mode configuration continues to work. Tests that used bang only to unfold local lets now request `zetaDelta := true` directly.
---
This is the direct-removal alternative to the competing warning-first PR #44501. |
t-meta |
30/61 |
Mathlib/Tactic/Abel.lean,Mathlib/Tactic/Linter/FlexibleLinter.lean,MathlibTest/Linter/Flexible/ImportHeavy.lean,MathlibTest/Tactic/Abel.lean |
4 |
2 |
['Parcly-Taxel', 'github-actions'] |
nobody |
0-37702 10 hours ago |
12-4452 12 days ago |
12-4445 12 days |
0 |
| 44893 |
unknown8575 author:unknown8575 |
chore(Topology/MetricSpace/Polish): generalize `IsClopenable.iUnion` to countable index types |
The proof only used ℕ to get `t' ≤ t` through index 0, but `exists_polishSpace_forall_le` already gives this directly. So the lemma now works for any countable index type, and the TODO is removed.
I used an LLM to find this TODO and draft the change. I've checked it, built it locally, and understand every line. |
t-topology
new-contributor
|
18/15 |
Mathlib/Topology/MetricSpace/Polish.lean |
1 |
5 |
['github-actions', 'plp127', 'unknown8575', 'vihdzp'] |
nobody |
0-36773 10 hours ago |
1-55854 1 day ago |
1-55847 1 day |
0 |
| 44907 |
grunweg author:grunweg |
chore: rename HomeomorphClass.toHomeomorph projection |
to Homeomorph.ofClass, in line with #31365.
---
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|
tech debt
t-topology
maintainer-merge
|
17/9 |
Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/Order/MonotoneContinuity.lean |
2 |
6 |
['github-actions', 'grunweg', 'themathqueen'] |
nobody |
0-35001 9 hours ago |
0-44162 12 hours ago |
1-14127 1 day |
0 |
| 42914 |
lman310 author:lman310 |
feat(Algebra): add zpow_right_injective |
Add IsMulTorsionFree.zpow_right_injective_iff, its injectivity alias, and the _inj version, together with their additive counterparts via to_additive.
Move the natural power injectivity lemmas from Mathlib.Algebra.Ring.NonZeroDivisors to Mathlib.Algebra.Group.Torsion and add their additive counterparts via to_additive.
Use natural scalar injectivity to move CharZero.of_hasUniqueDiv and its deprecated alias CharZero.of_isAddTorsionFree from Mathlib.Algebra.Module.Torsion.Free to Mathlib.Algebra.Module.NatInt, weakening AddCommGroup M to AddCancelCommMonoid M.
---
Codex was used to find the appropriate file `Mathlib.Algebra.Module.NatInt` for moving `CharZero.of_isAddTorsionFree`
---
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|
t-algebra
new-contributor
maintainer-merge
label:t-algebra$ |
48/24 |
Mathlib/Algebra/Group/Torsion.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Module/Torsion/Free.lean,Mathlib/Algebra/Ring/NonZeroDivisors.lean |
4 |
24 |
['felixpernegger', 'github-actions', 'lman310', 'mathlib-merge-conflicts', 'themathqueen'] |
nobody |
0-34598 9 hours ago |
0-43788 12 hours ago |
46-43057 46 days |
0 |
| 42827 |
wwylele author:wwylele |
chore(RingTheory/Pochhammer): fix the type of ascPochhammer_eval_succ |
The existing two theorems have the following signature
```lean4
theorem ascPochhammer_nat_eval_succ (r n : ℕ) :
n * Polynomial.eval (n + 1) (ascPochhammer ℕ r) = (n + r) * Polynomial.eval n (ascPochhammer ℕ r)
theorem ascPochhammer_eval_succ (S : Type*) [Semiring S] (r n : ℕ) :
↑n * Polynomial.eval (↑n + 1) (ascPochhammer S r) = (↑n + ↑r) * Polynomial.eval (↑n) (ascPochhammer S r)
```
However what's more useful in practice is the following
```lean4
theorem ascPochhammer_eval_succ {S : Type*} [Semiring S] (r : ℕ) (n : S) :
n * Polynomial.eval (n + 1) (ascPochhammer S r) = Polynomial.eval n (ascPochhammer S r) * (n + ↑r)
```
which this PR proves. Note that the multiplication order is changed so it doesn't require commutativity on S.
The old `ascPochhammer_nat_eval_succ` is now a specialization of the new `ascPochhammer_eval_succ` with `S = ℕ` & mul_comm, so it is redundant, thus deprecated.
---
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|
t-ring-theory
maintainer-merge
|
12/13 |
Mathlib/RingTheory/Polynomial/Bernstein.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean |
2 |
5 |
['Ruben-VandeVelde', 'github-actions', 'mathlib-merge-conflicts', 'tb65536', 'wwylele'] |
nobody |
0-34188 9 hours ago |
20-47144 20 days ago |
61-39109 61 days |
0 |
| 42649 |
vlad902 author:vlad902 |
chore(RingTheory): delete outdated `proof_wanted` |
[`MvPolynomial.ringKrullDim_of_isNoetherianRing`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/KrullDimension/Polynomial.html#MvPolynomial.ringKrullDim_of_isNoetherianRing) was added two years after this `proof_wanted` and is nearly identical. The difference is that it is defined for arbitrary index sets instead of `Fin` and for `CommRing` instead of `CommSemiring`. This is an artifact of `Ideal.height` being defined for `CommRing`s and `ringKrullDim` for `CommSemiring`s. Otherwise I think the original intention of this `proof_wanted` has already been satisfied.
---
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|
file-removed
t-ring-theory
maintainer-merge
|
0/16 |
Wanted.lean,Wanted/RingTheory/KrullDimension/Basic.lean |
2 |
2 |
['artie2000', 'github-actions', 'tb65536'] |
nobody |
0-34118 9 hours ago |
66-43641 66 days ago |
66-43634 66 days |
0 |
| 43758 |
joelcanary author:joelcanary |
feat(NumberTheory/ArithmeticFunction): the Redheffer determinant equals the Mertens function |
This PR adds the zeta (divisibility) matrix, the Redheffer matrix and the Mertens function, and proves **Redheffer's theorem** (1977): the determinant of the `(n+1) × (n+1)` Redheffer matrix equals the Mertens function `M(n+1) = ∑_{k ≤ n+1} μ(k)`.
In `Mathlib/NumberTheory/ArithmeticFunction/Moebius.lean`:
- `ArithmeticFunction.sum_divisors_moebius (k) : ∑ d ∈ k.divisors, μ d = if k = 1 then 1 else 0`, the pointwise form of `moebius_mul_coe_zeta`.
New file `Mathlib/NumberTheory/ArithmeticFunction/Redheffer.lean`:
- `ArithmeticFunction.mertens : ArithmeticFunction ℤ`, the summatory function of `μ`, with `mertens_apply : mertens n = ∑ k ∈ Icc 1 n, μ k`, `mertens_one`, `mertens_add_one` and `mertens_eq_sum_fin` (the `0`-based form `∑ i : Fin n, μ (i + 1)` used on the matrix side);
- `Matrix.zetaMatrix R n : Matrix (Fin n) (Fin n) R` for any `R` with `0` and `1` (entry `1` iff `i + 1 ∣ j + 1`), with `zetaMatrix_apply` (simp), `zetaMatrix_isUpperTriangular` and, for `CommRing R`, `det_zetaMatrix : det = 1` and `det_zetaMatrix_updateCol : det (updateCol 0 u) = ∑ j, μ (j + 1) * u j` (the first row of the inverse is `(μ 1, …, μ n)`);
- `Matrix.redheffer R n` (the zeta matrix with its first column set to ones), with `redheffer_apply` (simp) and `redheffer_eq_updateCol`;
- `Matrix.det_redheffer (n) : (redheffer R (n + 1)).det = mertens (n + 1)` for any `CommRing R` (with `mertens` cast into `R`).
The remaining declarations (the row vector `(μ 1, …, μ n)`, the reindexing of a `Fin n`-sum over divisibility as a sum over `m.divisors`, and three intermediate steps) are `private`: they are proof scaffolding, not API.
Proof sketch: by linearity of `det` in the first column, `det (redheffer R (n+1)) = det (zetaMatrix R (n+1)) + det (zetaMatrix with first column (0,1,…,1))`. The first term is `1`; by Cramer's rule (`det_smul_inv_mulVec_eq_cramer`) the second is the first row of the inverse of the zeta matrix dotted with `(0,1,…,1)`, and that row is `(μ 1, …, μ (n+1))` because `μ * ζ = 1` (`moebius_mul_coe_zeta`, via `sum_divisors_moebius`). The remaining sum `μ 2 + ⋯ + μ (n+1)` is `mertens (n+1) - 1`.
The ring `R` is an explicit argument of `zetaMatrix` and `redheffer` since nothing else determines it. Neither the Mertens function nor the Redheffer matrix currently appear in Mathlib. The new file imports only `LinearAlgebra.Matrix.Block` and `NumberTheory.ArithmeticFunction.Moebius`. References added to `docs/references.bib`: `redheffer1977` (the theorem) and `odlyzko1985` (cited in the module docstring for the disproof of the Mertens conjecture).
AI use: the Lean code and this description were written with an AI agent (Claude) under my direction, from a proof in my own project; I reviewed every declaration, and the branch was checked locally with `lake build`, `lake exe lint-style` and `lake exe runLinter` before each push.
|
t-number-theory
new-contributor
LLM-generated
|
238/0 |
Mathlib.lean,Mathlib/NumberTheory/ArithmeticFunction/Moebius.lean,Mathlib/NumberTheory/ArithmeticFunction/Redheffer.lean,docs/references.bib |
4 |
15 |
['Parcly-Taxel', 'github-actions', 'joelcanary', 'wwylele'] |
MichaelStollBayreuth assignee:MichaelStollBayreuth |
0-32193 8 hours ago |
28-55836 28 days ago |
34-29836 34 days |
2 |
| 40636 |
xroblot author:xroblot |
feat(RingTheory/FractionalIdeal): add HasUniqueRoots instance |
- The monoid of fractional ideals with respect to `S ≤ R⁰` is the localization of the monoid of ideals of `R` at the principal ideals generated by an element of `S`.
- The target of a localization map of a monoid with unique roots has unique roots.
- As a consequence, the monoid of fractional ideals has unique roots when the monoid of ideals does.
A comment also records that the monoid of ideals of a Dedekind domain has unique roots only once `Mathlib.Algebra.GroupWithZero.Torsion` is imported.
:robot: This PR was extracted from the [SKW project](https://github.com/xroblot/SKW) by Claude.
---
|
t-ring-theory |
75/12 |
Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/Ideal/IsPrincipal.lean |
3 |
16 |
['github-actions', 'jjdishere', 'mathlib-merge-conflicts', 'tb65536', 'xroblot'] |
mattrobball assignee:mattrobball |
0-31408 8 hours ago |
0-31409 8 hours ago |
90-66332 90 days |
0 |
| 44839 |
mortarsanjaya author:mortarsanjaya |
feat(Data/Nat/ModEq): add congruence mod lcm lemma |
The new lemma is just a version of `modEq_and_modEq_iff_modEq_mul` without the coprimality assumption. As a bonus, the proof of `modEq_and_modEq_iff_modEq_mul` is simplified as well.
---
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|
t-data
easy
maintainer-merge
|
7/7 |
Mathlib/Data/Nat/ModEq.lean |
1 |
5 |
['github-actions', 'mortarsanjaya', 'tb65536'] |
nobody |
0-30130 8 hours ago |
0-33682 9 hours ago |
3-12495 3 days |
0 |
| 44614 |
MichaelStollBayreuth author:MichaelStollBayreuth |
feat(GroupTheory/QuotientGroup/UnitsModPow): add Units.ModPow and API |
This is a first step toward extending Mathlib's coverage of Selmer groups of rings of S-integers in étale algebras over number fields, ultimately aiming at the Mordell-Weil Theorem for elliptic curves.
We add `Units.ModPow`, an `abbrev` for the quotient of the unit group of a commutative monoid by the subgroup consisting of `n`th powers, together with some basic API, in a new module (and some helper lemmas in other modules, including a few missing `to_additive` attributes).
This is upstreamed from [EllipticCurves](https://github.com/MichaelStollBayreuth/EllipticCurves). The code was originally written by Claude and then reviewed by me.
---
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t-algebra
LLM-generated
t-ring-theory
label:t-algebra$ |
187/3 |
Mathlib.lean,Mathlib/Algebra/Group/Commute/Units.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/GroupTheory/QuotientGroup/UnitsModPow.lean,Mathlib/RingTheory/DedekindDomain/SelmerGroup.lean |
5 |
11 |
['MichaelStollBayreuth', 'github-actions', 'mathlib-merge-conflicts', 'tb65536'] |
nobody |
0-29731 8 hours ago |
0-33092 9 hours ago |
3-26237 3 days |
0 |
| 44363 |
Parcly-Taxel author:Parcly-Taxel |
chore(Order): remove some `set_option`s |
* Remove `set_option`s from `Order.Nucleus` and `Order.OmegaCompletePartialOrder`.
* Remove `unusedVariables` options from all files in `Order` that have them. |
tech debt
t-order
|
77/102 |
Mathlib/Order/Booleanisation.lean,Mathlib/Order/Closure.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Order/Nucleus.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,Mathlib/Order/Sum/Lattice.lean |
6 |
3 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
0-29615 8 hours ago |
0-33631 9 hours ago |
16-37368 16 days |
0 |
| 44598 |
kirill-kondrashov author:kirill-kondrashov |
feat(LinearAlgebra/ExteriorPower): add API for HodgeStar |
---
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This is a follow-up of the https://github.com/leanprover-community/mathlib4/pull/43140 which stated a few TODO points.
This PR implements the first TODO point
* Add API to obviate the need to supply the volume element in the presence of `Module.Oriented`.
GPT 6 Luna Max was used for initial brainstorming (as well as Mathlib API investigation on the existing relevant constructions), mainly overwritten and refactored manually. |
t-algebra
LLM-generated
new-contributor
label:t-algebra$ |
23/1 |
Mathlib/LinearAlgebra/ExteriorPower/HodgeStar.lean |
1 |
7 |
['github-actions', 'kirill-kondrashov', 'themathqueen'] |
nobody |
0-29025 8 hours ago |
8-51904 8 days ago |
8-54642 8 days |
0 |
| 44829 |
pelicanhere author:pelicanhere |
refactor(Analysis/Normed): generalize scalar distance and diameter lemmas |
Generalize scalar distance and diameter lemmas to `NormedRing`, and drop the nonzero assumption from `infDist_smul₀`.
|
t-analysis
new-contributor
|
21/27 |
Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/Analysis/Normed/Module/Ball/Pointwise.lean |
2 |
5 |
['github-actions', 'leanprover-radar', 'pelicanhere', 'tb65536'] |
nobody |
0-28767 7 hours ago |
3-38263 3 days ago |
3-38256 3 days |
0 |
| 44876 |
Nicola9Falciola author:Nicola9Falciola |
feat(LinearAlgebra/Matrix): add the `prodEquiv` for `Matrix`, `GL` and `SL` |
---
I am adding the equivalence for `Matrix` , `GL` and `SL` induced by taking the product of types:
- `prodEquiv` for `Matrix m n (α × β) ≃ (Matrix m n α) × (Matrix m n β)` and all its variants.
- API on the determinant for the compatibility between `det` and `prodEquiv`
- the equivalence for `GL n (R × S) ≃* GL n R × GL n S`
- the equivalence for `SL n (R × S) ≃* SL n R × SL n S`
This PR follows up from the discussion in #43945. I am also uniformizing the API of `Equiv` in `transpose`
and in `piEquiv`.
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|
t-algebra label:t-algebra$ |
148/2 |
Mathlib/Data/Matrix/Basic.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Defs.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean |
4 |
28 |
['Nicola9Falciola', 'github-actions', 'themathqueen'] |
nobody |
0-27595 7 hours ago |
0-29353 8 hours ago |
2-11681 2 days |
0 |
| 44940 |
marcelolynch author:marcelolynch |
fix(Cache): retry uploads and report missing transfers |
The cache retries failed uploads and reports missing transfers. `MATHLIB_CACHE_PARALLEL_MAX` controls parallel uploads and downloads.
Uploads require curl 8.20 or later. CI installs a pinned binary from `leanprover-community/static-curl`. Downloads use a static binary or run serially when the system curl is too old.
Cache uploads have a 20-minute timeout. Post-build checks have a 30-minute timeout.
The cache tests and the [CI upload check](https://github.com/leanprover-community/mathlib4/actions/runs/38919909804) pass.
🤖
|
CI |
113/81 |
.github/workflows/build_template.yml,Cache/CI.md,Cache/IO.lean,Cache/Main.lean,Cache/README.md,Cache/Requests.lean,Cache/Test.lean,Cache/Upload/Curl.lean,docs/workflows.md |
9 |
1 |
['github-actions'] |
nobody |
0-27392 7 hours ago |
0-27964 7 hours ago |
0-33399 9 hours |
1 |
| 36239 |
plp127 author:plp127 |
feat(FieldTheory/KrullTopology): define uniform group structure on galois group |
Endow the galois group of a field extension `Gal(L/K)` with the structure of a uniform group. Use this to prove some properties of the galois group earlier, for example, that the galois group is compact is immediate, and in more generality than the version proved in `FieldTheory/Galois/Profinite`. Deprecate some material which used to be used to define the krull topology, but is now unused since the krull topology comes out of the uniform structure.
---
- [x] depends on: #39759
- [x] depends on: #42152
- [x] depends on: #42154
- [x] depends on: #42141
- [x] depends on: #42117
- [x] depends on: #42163
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|
t-algebra
tech debt
increases-technical-debt
label:t-algebra$ |
465/228 |
Mathlib/FieldTheory/AbsoluteGaloisGroup.lean,Mathlib/FieldTheory/Galois/Infinite.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/NumberTheory/Cyclotomic/CyclotomicCharacter.lean |
5 |
47 |
['acmepjz', 'dagurtomas', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'plp127', 'vihdzp'] |
mattrobball assignee:mattrobball |
0-26326 7 hours ago |
0-27142 7 hours ago |
76-16454 76 days |
0 |
| 42453 |
Multramate author:Multramate |
feat(NumberTheory/EllipticDivisibilitySequence): prove that a normalised elliptic divisibility sequence is an elliptic sequence |
This is the updated version of #13155 and contains the proof that a sequence satisfying the even and odd elliptic relations (with mild additional conditions) is an elliptic net and hence an elliptic sequence. This is the main argument in [Section 2 of Junyan's paper](https://arxiv.org/pdf/2604.05280). Previously it was broken down into hundreds of lines of multiple lemmas but I was able to condense it into a single lemma with multiple `wlog`s that are hopefully self-explanatory.
Co-authored-by: Junyan Xu <junyanxu.math@gmail.com>
---
- [x] depends on: #42477
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|
t-algebra
t-number-theory
large-import
label:t-algebra$ |
140/12 |
Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean,docs/references.bib |
4 |
60 |
['Multramate', 'YaelDillies', 'alreadydone', 'copilot-pull-request-reviewer', 'github-actions', 'kbuzzard', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'riccardobrasca', 'tb65536'] |
riccardobrasca and tb65536 assignee:tb65536 assignee:riccardobrasca |
0-25692 7 hours ago |
0-27160 7 hours ago |
61-7776 61 days |
0 |
| 44824 |
Multramate author:Multramate |
chore: rename `nonzero` to `ne_zero` in theorem names |
This renames theorems whose `nonzero` stands for a `≠ 0` hypothesis or conclusion to use `ne_zero`.
🤖 Generated with [Claude Code](https://claude.com/claude-code) |
LLM-generated |
391/223 |
Mathlib/Algebra/Group/Fin/Tuple.lean,Mathlib/Algebra/Lie/Weights/IsSimple.lean,Mathlib/Algebra/Lie/Weights/Killing.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/Algebra/Module/LinearMap/Polynomial.lean,Mathlib/Algebra/Polynomial/Degree/CardPowDegree.lean,Mathlib/Algebra/Polynomial/Degree/Support.lean,Mathlib/Algebra/Polynomial/Degree/TrailingDegree.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/Reverse.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Polynomial/UnitTrinomial.lean,Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Complex/Periodic.lean,Mathlib/Analysis/InnerProductSpace/OfNorm.lean,Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/Meromorphic/Basic.lean,Mathlib/Analysis/Meromorphic/Order.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromBounded.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Shapes/ZeroMorphisms.lean,Mathlib/CategoryTheory/Preadditive/Schur.lean,Mathlib/CategoryTheory/Simple.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/ToDFinsupp.lean,Mathlib/FieldTheory/RatFunc/Valuation.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/Geometry/Euclidean/Sphere/OrthRadius.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/Projectivization/Independence.lean,Mathlib/LinearAlgebra/Projectivization/PSL/PSL2.lean,Mathlib/MeasureTheory/Group/ModularCharacter.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/Bochner/Set.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/MeasureTheory/Measure/Haar/Extension.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean,Mathlib/MeasureTheory/Measure/ProbabilityMeasure.lean,Mathlib/NumberTheory/ArithmeticFunction/Moebius.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleCardPowDegree.lean,Mathlib/NumberTheory/Harmonic/Int.lean,Mathlib/NumberTheory/ModularForms/Discriminant.lean,Mathlib/NumberTheory/ModularForms/LevelOne/DimensionFormula.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean,Mathlib/NumberTheory/ModularForms/RamanujanFormula.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/RepresentationTheory/AlgebraRepresentation/Basic.lean,Mathlib/RepresentationTheory/FinGroupCharZero.lean,Mathlib/RingTheory/Algebraic/Basic.lean,Mathlib/RingTheory/Algebraic/Integral.lean,Mathlib/RingTheory/FractionalIdeal/Inverse.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/Ideal/GoingUp.lean,Mathlib/RingTheory/Jacobson/Ring.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/SimpleModule/Rank.lean,Mathlib/RingTheory/WittVector/DiscreteValuationRing.lean,Mathlib/RingTheory/WittVector/FrobeniusFractionField.lean,Mathlib/RingTheory/WittVector/Identities.lean,Mathlib/RingTheory/WittVector/Isocrystal.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Monomial/Basic.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean |
73 |
12 |
['JX-Mo', 'Multramate', 'github-actions', 'mathlib-merge-conflicts', 'tb65536'] |
nobody |
0-25220 7 hours ago |
0-26933 7 hours ago |
1-32327 1 day |
0 |
| 44757 |
mycaule author:mycaule |
feat(LinearAlgebra/ExteriorPower/Basis): the Cauchy–Binet formula |
Add to `Mathlib/LinearAlgebra/ExteriorPower/Basis.lean`, for matrices over a commutative ring with `ι` finite and linearly ordered:
`Matrix.det_mul_eq_sum_powersetCard`: for `A : Matrix (Fin n) ι R` and `B : Matrix ι (Fin n) R`, `det (A * B) = ∑ s : powersetCard ι n, det (A.submatrix id s) * det (B.submatrix s id)`, each `s` enumerated in increasing order (`powersetCard.ofFinEmbEquiv.symm s`)
`Matrix.det_submatrix_mul`: the same for the minors of `A * B` on rows `I : Fin n → l` and columns `K : Fin n → o`.
---
Mathlib has `det_mul` for square matrices but no Cauchy–Binet formula. #40473 and #44209 (both closed) proved it by direct computation with permutations, and the review of #40473 pointed to exterior powers instead. Here the square case applies `exteriorPower.pairingDual` to the expansion of `ιMulti R n (rows of A)` in `Module.Basis.exteriorPower` (`Basis.sum_repr`); the minors version follows from it through `Matrix.submatrix_mul`.
Questions for reviewers: the names; whether the sum should be over `Fin n ↪o ι` instead of `powersetCard ι n`.
AI disclosure: the Lean proof was written by an AI model (Claude, Anthropic) under my direction, with the proof of the square case suggested in review. I have read and checked it and will handle the review.
|
t-algebra
new-contributor
LLM-generated
label:t-algebra$ |
29/0 |
Mathlib/LinearAlgebra/ExteriorPower/Basis.lean |
1 |
15 |
['github-actions', 'mycaule', 'themathqueen'] |
nobody |
0-22719 6 hours ago |
2-28930 2 days ago |
5-44745 5 days |
0 |
| 35548 |
gasparattila author:gasparattila |
fix(Tactic/FunProp): do not unfold semireducible definitions in the presence of projections |
Currently, `fun_prop` incorrectly unfolds semireducible definitions when a projection or recursor is applied. This PR fixes this by switching to `whnfR` together with `Lean.Meta.withCanUnfoldPred` for the custom unfolding logic.
Unfortunately, there are many proofs which rely on this bug. To avoid breaking proofs, the option `fun_prop.projDefaultTransparency` is added for locally restoring the previous behavior. Removing the uses of this option is left for future PRs.
---
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|
t-meta
tech debt
increases-technical-debt
|
114/53 |
Mathlib/Analysis/Matrix/Normed.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Condensed/Light/TopCatAdjunction.lean,Mathlib/Condensed/TopCatAdjunction.lean,Mathlib/Geometry/Convex/ConvexSpace/PathConnectedSpaceStdSimplex.lean,Mathlib/NumberTheory/Harmonic/ZetaAsymp.lean,Mathlib/NumberTheory/ModularForms/Bounds.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/FunctionData.lean,Mathlib/Tactic/FunProp/Mor.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Topology/Algebra/AffineSubspace.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/ContinuousAffineEquiv.lean,Mathlib/Topology/Algebra/Field.lean,Mathlib/Topology/Algebra/Group/ContinuousDiv.lean,Mathlib/Topology/Algebra/Group/ContinuousInv.lean,Mathlib/Topology/Algebra/Group/Matrix.lean,Mathlib/Topology/Algebra/Group/Torsor.lean,Mathlib/Topology/Algebra/Group/Units.lean,Mathlib/Topology/Algebra/Module/ContinuousLinearMap/Positive.lean,Mathlib/Topology/Algebra/Module/Equiv/Basic.lean,Mathlib/Topology/Algebra/Module/Equiv/Prod.lean,Mathlib/Topology/Algebra/Module/Equiv/Submodule.lean,Mathlib/Topology/Algebra/Module/IsWeak.lean,Mathlib/Topology/Algebra/Module/Spaces/WeakBilin.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Algebra.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Semicontinuity/Michael.lean,MathlibTest/FunPropMinimal.lean |
34 |
16 |
['DavidLedvinka', 'JovanGerb', 'gasparattila', 'github-actions', 'j-loreaux', 'lecopivo', 'mathlib-merge-conflicts'] |
nobody |
0-21792 6 hours ago |
17-51402 17 days ago |
53-19486 53 days |
0 |
| 44945 |
CollinYuanjieRen author:CollinYuanjieRen |
chore(Algebra/Lie): generalize subalgebra map membership |
Generalize `LieSubalgebra.mem_map_submodule` to arbitrary Lie algebra morphisms. Add `mem_map_equiv` and update the three skew-adjoint equivalence proofs.
Continues Eric Rodriguez Boidi's #7994, marked `please-adopt`.
---
Checked the five affected modules with Lean 4.36.0-rc1 and a zero-morphism client regression.
AI-assisted: Codex prepared the Lean changes; GPT-6 Astra assisted with proof checks.
|
t-algebra
LLM-generated
new-contributor
label:t-algebra$ |
9/6 |
Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Subalgebra.lean |
2 |
3 |
['CollinYuanjieRen', 'github-actions'] |
nobody |
0-18703 5 hours ago |
0-19470 5 hours ago |
0-19463 5 hours |
0 |
| 44799 |
ooovi author:ooovi |
feat(Geometry/Convex): segments in convex space |
Adds segments and open segments for convex spaces, and provides some basic API. Follows `Mathlib.Analysis.Convex.Segment`.
---
I want to define extreme sets in convex space using open segments. I don't need a lot of API and just ported the basics from analysis, but I'm happy to add more if anyone needs anything.
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|
t-convex-geometry |
265/0 |
Mathlib.lean,Mathlib/Geometry/Convex/Segment.lean |
2 |
63 |
['github-actions', 'martinwintermath', 'ooovi', 'vihdzp', 'vlad902'] |
vihdzp assignee:vihdzp |
0-18459 5 hours ago |
0-61485 17 hours ago |
1-5378 1 day |
0 |
| 44891 |
tb65536 author:tb65536 |
feat(Analysis/Matrix/GelfandRadius): prove `gelfandRadius (A * B) = gelfandRadius (B * A)` for matrices |
This PR proves `gelfandRadius (A * B) = gelfandRadius (B * A)` for matrices. This is used in #42985 to compute the Gelfand radius of left-multiplication in a finite extension of a normed field.
---
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|
t-analysis
maintainer-merge
|
53/1 |
Mathlib.lean,Mathlib/Analysis/Matrix/GelfandRadius.lean,Mathlib/Analysis/Normed/Algebra/GelfandRadius.lean,Mathlib/Data/Matrix/Mul.lean |
4 |
15 |
['github-actions', 'tb65536', 'themathqueen'] |
nobody |
0-14191 3 hours ago |
0-26936 7 hours ago |
1-24871 1 day |
1 |
| 42675 |
vlad902 author:vlad902 |
feat(NielsenSchreier): add `to_additive` to Nielsen-Schreier theorem |
The proof of the Nielsen-Schreier theorem is not currently `to_additive`ized because it relies on category theory infrastructure like `End`/`IsFreeGroupoid`/`Quiver` that are not `to_additive` and don't appear to be very amenable to adding it.
Instead, `to_additive`ize Nielsen-Schreier by directly going across the isomorphism between `FreeGroup` and `Multiplicative (FreeAddGroup)`.
---
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[](https://gitpod.io/from-referrer/)
|
t-group-theory
maintainer-merge
|
70/2 |
Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/FreeGroup/IsFreeGroup.lean,Mathlib/GroupTheory/FreeGroup/NielsenSchreier.lean,docs/1000.yaml |
4 |
25 |
['github-actions', 'tb65536', 'vihdzp', 'vlad902'] |
nobody |
0-13086 3 hours ago |
0-25368 7 hours ago |
10-3497 10 days |
1 |
| 44947 |
gasparattila author:gasparattila |
chore(LinearAlgebra/AffineSpace/Homogenization): use `inferInstanceAs` |
This PR redefines the instances of `Homogenization` using `inferInstanceAs`, which now handles non-exposed definitions correctly. This avoids leaking the implementation (which uses choice), and also fixes diamonds involving `NSMul` and `ZSMul`.
---
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|
t-algebra
tech debt
label:t-algebra$ |
10/15 |
Mathlib/LinearAlgebra/AffineSpace/Homogenization.lean |
1 |
5 |
['JX-Mo', 'gasparattila', 'github-actions', 'grunweg', 'leanprover-radar'] |
nobody |
0-12285 3 hours ago |
0-14638 4 hours ago |
0-14631 4 hours |
0 |
| 42342 |
artie2000 author:artie2000 |
feat: `membership` tactic |
* Add `membership` tactic / `grind` ruleset for closing substructure membership goals.
* Change tests for `aesop` `SetLike` ruleset into tests for the `membership` tacitc.
This is a rewrite of the `aesop` `SetLike` ruleset for `grind`.
---
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|
t-algebra
t-meta
label:t-algebra$ |
96/63 |
Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/Order/Ring/Ordering/Basic.lean,Mathlib/Algebra/Order/Ring/Ordering/Defs.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subring/Defs.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Defs.lean,Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/Basic/SetLike/Basic.lean,Mathlib/Data/Set/Insert.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Defs.lean,Mathlib/Geometry/Convex/Cone/Basic.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/Order/BooleanSubalgebra.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Defs.lean,Mathlib/Tactic/GrindAttrs.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/NonUnitalAlgebra.lean,Mathlib/Topology/Algebra/NonUnitalStarAlgebra.lean,Mathlib/Topology/Algebra/StarSubalgebra.lean,MathlibTest/SetLike.lean |
38 |
15 |
['artie2000', 'github-actions', 'j-loreaux', 'joneugster', 'mathlib-merge-conflicts'] |
nobody |
0-8096 2 hours ago |
0-8097 2 hours ago |
18-28515 18 days |
0 |
| 44933 |
SnirBroshi author:SnirBroshi |
feat(LinearAlgebra/Matrix): `row` and `col` are linear maps |
`simp` lemmas for `(A + B).row` and similar expressions, and bundled forms of `row`/`col` as `AddEquiv`/`LinearEquiv`. Also made `row`/`col` themselves `Equiv`s, similar to existing `Matrix` functions (`of`/`reindex`/`comp`).
---
`detp_eq_of_row_eq` sped up from ~420ms to ~140ms
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|
t-algebra label:t-algebra$ |
161/8 |
Mathlib/Data/Matrix/Basic.lean,Mathlib/LinearAlgebra/Matrix/Defs.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/LinearAlgebra/Matrix/Nonsingular.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/LinearAlgebra/Matrix/SemiringInverse.lean |
6 |
3 |
['SnirBroshi', 'github-actions', 'themathqueen'] |
nobody |
0-7111 1 hour ago |
0-15711 4 hours ago |
0-46692 12 hours |
0 |
| 44299 |
artie2000 author:artie2000 |
feat(FieldTheory/Galois): intermediate fields corresponding to Sylow subgroups |
* Prove existence of intermediate fields of prime power index in a Galois extension using Sylow's first theorem
* Add missing versions of Sylow's first theorem and the Galois correspondence
* Rename some lemmas for clarity and consistency
---
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|
t-group-theory
maintainer-merge
|
84/17 |
Mathlib.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/Infinite.lean,Mathlib/FieldTheory/Galois/Sylow.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/Sylow.lean |
6 |
27 |
['artie2000', 'github-actions', 'tb65536', 'vihdzp', 'wwylele'] |
tb65536 assignee:tb65536 |
0-6874 1 hour ago |
7-3140 7 days ago |
15-29599 15 days |
0 |
| 34910 |
SnirBroshi author:SnirBroshi |
feat(Combinatorics/SimpleGraph/Acyclic): a graph is a tree iff it's acyclic and has exactly `n - 1` edges |
---
This was my white whale for quite some time. Hooray!
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics |
91/6 |
Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Order/RelIso/Basic.lean |
3 |
24 |
['Rida-Hamadani', 'SnirBroshi', 'amellendijk', 'github-actions', 'jt0202', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
YaelDillies assignee:YaelDillies |
0-6103 1 hour ago |
97-22234 97 days ago |
122-57388 122 days |
0 |
| 39037 |
JovanGerb author:JovanGerb |
chore: improve some instances |
These instances were found to cause slow type class searches. This is needed to avoid timeouts in the instance diamonds linter.
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t-category-theory |
2/2 |
Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Limits/Shapes/ConcreteCategory.lean |
2 |
10 |
['JovanGerb', 'github-actions', 'grunweg', 'leanprover-radar', 'mathlib-bors'] |
kim-em assignee:kim-em |
0-6102 1 hour ago |
14-25425 14 days ago |
14-56803 14 days |
0 |
| 39212 |
emlis42 author:emlis42 |
feat(Algebra/ContinuedFractions): add `partNumsStream'` and `partNumsStream'` |
This PR adds `partNumsStream'` and `partDensStream'`, which provide infinite stream representations for the sequences of partial numerators and denominators of a generalized continued fraction. |
t-algebra
new-contributor
label:t-algebra$ |
68/36 |
Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/ContinuedFractions/ContinuantsRecurrence.lean,Mathlib/Algebra/ContinuedFractions/Determinant.lean,Mathlib/Algebra/ContinuedFractions/Euler.lean,Mathlib/Algebra/ContinuedFractions/Translations.lean |
5 |
7 |
['emlis42', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-merge-conflicts'] |
YaelDillies assignee:YaelDillies |
0-6101 1 hour ago |
22-38519 22 days ago |
156-45756 156 days |
0 |
| 40736 |
tb65536 author:tb65536 |
feat(NumberTheory/NumberField/HeckeLFunction): define Hecke L-Functions |
This PR defines Hecke L-Functions.
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|
t-number-theory
t-algebra
label:t-algebra$ |
130/0 |
Mathlib.lean,Mathlib/NumberTheory/NumberField/HeckeLFunction.lean |
2 |
4 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
alreadydone assignee:alreadydone |
0-6100 1 hour ago |
50-21491 50 days ago |
50-21888 50 days |
0 |
| 41892 |
Ljon4ik4 author:Ljon4ik4 |
feat: mapOfCompatibleSMul is the same map independently of S |
The `mapOfCompatibleSMul : M ⊗[A] N →ₗ[S] M ⊗[R] N` is the same map independently of `S`. This PR adds two lemmas asserting that (one for the underlying AddHom, one for the kernels).
I am not quite sure whether the second one is in the optimal shape: It was the shape useful to me, but maybe there is some better way to phrase it or it should be omitted completely (since it follows from the first one...).
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|
t-algebra label:t-algebra$ |
18/1 |
Mathlib/LinearAlgebra/TensorProduct/Basic.lean |
1 |
26 |
['Ljon4ik4', 'Ruben-VandeVelde', 'github-actions', 'mathlib-merge-conflicts', 'themathqueen'] |
eric-wieser assignee:eric-wieser |
0-6098 1 hour ago |
7-60727 7 days ago |
87-21289 87 days |
0 |
| 42046 |
LegaSage author:LegaSage |
feat(Polynomial): add Wronskian linear dependence lemmas |
This extends the polynomial Wronskian API of Baek and Lee from the existing coprime case to arbitrary polynomials over a characteristic-zero field.
It adds:
* an explicit nontrivial scalar relation for any pair with zero Wronskian, including zero-polynomial edge cases;
* scalar-multiple corollaries when either polynomial is nonzero;
* the weighted derivative corollary that solutions of `a * f' - n * a' * f = 0` are scalar multiples of `a ^ n` when `a ≠ 0`.
The proof factors out the polynomial gcd and applies the existing `IsCoprime.wronskian_eq_zero_iff` theorem. This PR makes no novelty claim; it packages standard consequences of the existing Baek–Lee coprime Wronskian API.
-------
The implementation was prepared with assistance from OpenAI Codex and reviewed and submitted by LegaSage.
|
t-ring-theory
new-contributor
large-import
LLM-generated
|
96/1 |
Mathlib/RingTheory/Polynomial/Wronskian.lean |
1 |
2 |
['github-actions'] |
mattrobball assignee:mattrobball |
0-6097 1 hour ago |
85-3886 85 days ago |
85-3879 85 days |
0 |
| 42110 |
Zeta-Wu author:Zeta-Wu |
feat: add path length for paths in pseudo emetric spaces |
This PR defines the length of a path in a `PseudoEMetricSpace` as its variation on the unit interval.
It proves the basic properties of path length:
- the endpoint distance is bounded by the length;
- the constant path has length zero;
- reversing a path preserves its length;
- concatenating two paths adds their lengths.
Main declarations:
- `Path.length`
- `Path.edist_le_length`
- `Path.length_refl`
- `Path.length_symm`
- `Path.length_trans`
This is intended as a first step toward a broader theory of rectifiable paths, including later results on invariance of length under monotone reparametrization, and shortest paths are line segments up to monotone reparametrization in strict convex spaces.
This PR was discussed on Zulip [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/PR.20.2342110.3A.20Path.2Elength.20in.20PseudoEMetricSpace).
AI disclosure: I used an agent called ReasLingo to generate those codes. After the codes are generated I read them line by line and ask the agent to rewrite some proofs when I think it is a bad code. For design decisions, I asked the agent to give me several versions, and I manually picked one of them to make sure it fits human understanding.
---
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|
t-topology
new-contributor
LLM-generated
|
231/0 |
Mathlib.lean,Mathlib/Topology/EMetricSpace/ArcLength.lean,Mathlib/Topology/EMetricSpace/PathLength.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/UnitInterval.lean |
5 |
129 |
['CoolRmal', 'SnirBroshi', 'Zeta-Wu', 'felixpernegger', 'github-actions', 'pelicanhere', 'scholzhannah'] |
ADedecker assignee:ADedecker |
0-6096 1 hour ago |
30-46742 30 days ago |
70-72328 70 days |
0 |
| 42487 |
bocowgill author:bocowgill |
feat(Algebra/BigOperators/Group/Finset/Powerset): add nested powersetCard identities |
This PR adds product and sum identities for nested collections of fixed-cardinality subsets. For `r ≤ k`, each `r`-element subset of a finite set `s` is contained in exactly
`Nat.choose (s.card - r) (k - r)`
of the `k`-element subsets of `s`. Thus, a sum over the `r`-element subsets of every `k`-element subset reduces to this multiplicity, times a single sum over `s.powersetCard r`. The product version is the analogous power identity.
The proof exchanges the order of the two big operators using `Finset.prod_comm'`. It then counts each fiber with `Finset.card_filter_powersetCard_subset`. The additive identities are generated with `to_additive`. The PR also provides the useful elementwise specialization `r = 1`.
**Motivation**: These results provide reusable weighted double-counting tools for finite combinatorics. They are useful in arguments about uniform set systems, incidence relations, and sums or products over fixed-cardinality subsets.
---
### LLM disclosure
For theorem planning and Lean implementation, I used OpenAI Codex substantially. I also used Codex to search Mathlib and open PRs for related results, suggest naming and documentation, iterate on the proofs, audit import dependencies, and validate the commits locally.
I personally reviewed the mathematical statements and Lean code line-by-line, including the naming and API choices. I also confirmed that I can explain each step of the proofs.
For the current revision, I ran a targeted build of `Mathlib.Algebra.BigOperators.Group.Finset.Powerset`, the style and environment linters, and `git diff --check`. I also inspected the generated additive declarations and axiom dependencies, and tested an alternative proof using explicit incidence finsets. The complete GitHub CI suite passes.
This is one of my earliest Mathlib contributions. I welcome corrections and suggestions, and I am prepared to revise the PR and learn from the review. |
t-algebra
new-contributor
LLM-generated
label:t-algebra$ |
27/0 |
Mathlib/Algebra/BigOperators/Group/Finset/Powerset.lean |
1 |
17 |
['bocowgill', 'github-actions', 'pepamontero'] |
eric-wieser assignee:eric-wieser |
0-6095 1 hour ago |
32-84733 32 days ago |
71-26683 71 days |
0 |
| 42541 |
NoahW314 author:NoahW314 |
feat: add `CharZero`/`CharP` instances on `OrderDual` and `Lex` |
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t-algebra
large-import
label:t-algebra$ |
11/1 |
Mathlib/Algebra/Order/Ring/Synonym.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean |
2 |
1 |
['eric-wieser', 'github-actions'] |
eric-wieser assignee:eric-wieser |
0-6094 1 hour ago |
70-35533 70 days ago |
70-37284 70 days |
0 |
| 43041 |
ajirving author:ajirving |
feat(Analysis/Analytic): analytic order of a constant function and multiplying by constants |
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Adds analyticOrderAt_const (which matches the meromorphic version) as well as various forms of analyticOrderAt_mul_const and analyticOrderNatAt variants. |
t-analysis |
48/0 |
Mathlib/Analysis/Analytic/Order.lean |
1 |
8 |
['ajirving', 'github-actions', 'j-loreaux'] |
ADedecker assignee:ADedecker |
0-6093 1 hour ago |
30-31877 30 days ago |
54-62197 54 days |
0 |
| 43191 |
lua-vr author:lua-vr |
feat(MeasureTheory): generalize `QuasiMeasurePreserving` to `AEMeasurable` |
We relax the definition of `QuasiMeasurePreserving` from assuming the map is `Measurable` to assuming it is `AEMeasurable`. This comes as a first step for doing the same for `MeasurePreserving`.
A motivation for the change of both definitions is that `Measure.map` has a meaningful value for all `AEMeasurable` maps, and it would make the measure-preserving definition equivalent to the `HasLaw` definition, allowing more shared API.
---
The change was discussed in this Zulip topic: [link](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/MeasureTheory.3A.20Various.20refactors/with/620111393).
- [x] depends on: #43484
- [x] depends on: #43486
- [x] depends on: #43485
- [x] depends on: #43496
- [x] depends on: #43190
Made with the help of Sonnet, but organized, reviewed and edited by me.
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|
t-measure-probability |
97/75 |
Mathlib/Dynamics/Ergodic/Action/OfMinimal.lean,Mathlib/Dynamics/Ergodic/Ergodic.lean,Mathlib/Dynamics/Ergodic/Extreme.lean,Mathlib/Dynamics/Ergodic/MeasurePreserving.lean,Mathlib/MeasureTheory/Constructions/Pi.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/AEStronglyMeasurable.lean,Mathlib/MeasureTheory/Group/Prod.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean,Mathlib/MeasureTheory/Measure/Prod.lean,Mathlib/MeasureTheory/Measure/QuasiMeasurePreserving.lean,Mathlib/Probability/Density.lean,Mathlib/Probability/Kernel/CondDistrib.lean |
13 |
7 |
['github-actions', 'lua-vr', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
urkud assignee:urkud |
0-6092 1 hour ago |
7-26481 7 days ago |
12-17364 12 days |
1 |
| 44628 |
JovanGerb author:JovanGerb |
chore(CategoryTheory/Monad): use `to_dual` |
This PR uses `to_dual` for `Monad`/`Comonad`, and for the Kleisli and Eilenberg Moore categories.
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|
tech debt
t-category-theory
|
175/393 |
Mathlib/CategoryTheory/Monad/Algebra.lean,Mathlib/CategoryTheory/Monad/Basic.lean,Mathlib/CategoryTheory/Monad/Kleisli.lean,Mathlib/Tactic/Translate/ToDual.lean |
4 |
9 |
['JovanGerb', 'github-actions', 'joelriou', 'mathlib-bors'] |
nobody |
0-5525 1 hour ago |
0-5559 1 hour ago |
3-78486 3 days |
0 |
| 40922 |
Thmoas-Guan author:Thmoas-Guan |
feat(Algebra/Module): minimal generators of module over local ring |
In this PR, we proved for fg module over local ring, "two set of minimal generators can be transported by an invertible matrix", implemented as the commuting morphism between the source of the two surjection must be bijective.
(The last lemma is for transport between Koszul complex form two set of generators)
---
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|
t-algebra label:t-algebra$ |
93/0 |
Mathlib.lean,Mathlib/Algebra/Module/MinimalGenerators.lean |
2 |
1 |
['github-actions'] |
nobody |
0-5201 1 hour ago |
115-68246 115 days ago |
115-68239 115 days |
2 |
| 40953 |
ymonbru author:ymonbru |
feat: the definition of a KSheaf on a T2 Space |
This files adds the definition of a KSheaf on a T2 space with value in an arbitrary category.
One may expect this notion to come from sheaves on a site of compact subset of a topological space but there is no coresponding Grothendieck topology on compact subsets. In particular, this is because one of the axioms is in the form of a colimit and can't be expressed as a limit condition (hence a sheaf condition).
It also adds API that allow to use the axioms in a convenient way.
---
- [x] depends on: #40737
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|
new-contributor
t-topology
|
137/0 |
Mathlib.lean,Mathlib/Topology/Sheaves/KSheaf.lean |
2 |
26 |
['Multramate', 'github-actions', 'joelriou', 'mathlib-dependent-issues', 'ymonbru'] |
nobody |
0-5200 1 hour ago |
21-18369 21 days ago |
102-55842 102 days |
1 |
| 40368 |
Sanghyeok0 author:Sanghyeok0 |
feat: add confluence predicates for relations |
This PR adds a minimal relation-level API for confluence-style properties:
* `Relation.IsDiamond`
* `Relation.IsConfluent`
* `Relation.IsChurchRosser`
It also adds the basic API connecting these predicates:
* `Relation.ReflTransGen.to_eqvGen`
* `Relation.Join.le_eqvGen`
* `Relation.IsChurchRosser.isConfluent`
* `Relation.IsConfluent.isChurchRosser`
* `Relation.IsChurchRosser.join_reflTransGen_eq_eqvGen`
The main downstream application is the polynomial-reduction development in
#41475. There, polynomial reduction is treated as an ordinary relation on
`MvPolynomial`, and these predicates are used to formulate confluence and the
Church--Rosser property.
A more general rewriting API exists in CSLib. This PR does not attempt to
upstream that API wholesale; its scope is intentionally limited to the
declarations needed by the downstream polynomial application.
The earlier version of this PR also introduced
`Relation.StronglyConfluent` and additional equivalence packaging. Those
declarations have been removed to keep this PR small and application-driven.
Reference: Becker, Weispfenning, and Kredel,
*Gröbner Bases: A Computational Approach to Commutative Algebra*.
AI usage disclosure:
I used OpenAI Codex to generate initial drafts of the definitions, theorem statements, proof scripts, and docstrings. I made the final decisions on the mathematical scope and API design, reviewed the generated code and final changes, and made a few edits to statements and docstrings.
---
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|
t-logic
new-contributor
tech debt
LLM-generated
|
103/25 |
Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/Logic/Relation.lean |
2 |
36 |
['Sanghyeok0', 'SnirBroshi', 'chenson2018', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
0-5199 1 hour ago |
40-23584 40 days ago |
112-13492 112 days |
1 |
| 30109 |
scholzhannah author:scholzhannah |
feat: the subcomplexes of a (relative classical) CW complex form a completely distributive lattice |
In this PR we prove that the space of subcomplexes `Subcomplex C` of a (relative classical) CW complex `C` is a `CompletelyDistribLattice`.
---
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|
t-topology |
313/0 |
Mathlib/Topology/CWComplex/Classical/Subcomplex.lean |
1 |
32 |
['ADedecker', 'felixpernegger', 'github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'scholzhannah', 'themathqueen'] |
nobody |
0-5197 1 hour ago |
45-38331 45 days ago |
154-40607 154 days |
0 |
| 40841 |
TJHeeringa author:TJHeeringa |
chore(Topology/Algebra): rename .equivOfInverse to .ofContinuousLinearMap |
Renames `ContinuousLinearEquiv.equivOfInverse` and `ContinuousLinearEquiv.equivOfInverse'` to `ContinuousLinearEquiv.ofContinuousLinearMap` and `ContinuousLinearEquiv.ofContinuousLinearMap'`. It reorders the order of arguments to match that of `ofLinearMap`.
---
Addresses the ToDO `*ToDo*: Improve the naiming to make it match `LinearMap.ofLinear`.` for `ContinuousLinearEquiv.equivOfInverse`.
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|
t-topology
tech debt
|
80/25 |
Mathlib/Analysis/InnerProductSpace/TensorProduct.lean,Mathlib/Topology/Algebra/Module/ContinuousLinearMap/Invertible.lean,Mathlib/Topology/Algebra/Module/Equiv/Basic.lean |
3 |
83 |
['TJHeeringa', 'Whysoserioushah', 'b-mehta', 'github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'themathqueen'] |
nobody |
0-5196 1 hour ago |
21-24552 21 days ago |
37-65166 37 days |
0 |
| 42142 |
philipp-svinger author:philipp-svinger |
feat(Analysis/ODE): peano existence theorem, Tonelli approximation 1 |
Add Tonelli approximation method for ODEs.
Implement the structure IsPeano similar to IsPicardLindelof. Construct a sequence of approximations using Tonelli technique.
First step towards Peano existence
Co-authored-by: Florian Grube <fgrube@math.uni-bielefeld.de>
Co-authored-by: Paul Niessner <pniessner@math.uni-bielefeld.de>
Co-authored-by: Julian Rolfes <jrolfes@math.uni-bielefeld.de>
Co-authored-by: Luke Schleef <lschleef@math.uni-bielefeld.de>
Co-authored-by: Philipp Svinger <psvinger@math.uni-bielefeld.de>
---
We want to add the proof of the Peano existence theorem for ODEs, using Tonelli approximations.
This will be a series of PRs working towards this goal. In this first PR, we
implement the structure IsPeano similar to IsPicardLindelof and construct a sequence of approximations using Tonelli technique. See our further PRs for more information, last: #42148
---
The statements, definitions and proofs were written without AI.
AI was used afterwards to help us to adapt our code to the style and naming conventions.
We also used it in the process of writing a documentation.
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|
t-analysis
new-contributor
|
207/0 |
Mathlib.lean,Mathlib/Analysis/ODE/Peano.lean |
2 |
24 |
['github-actions', 'mcdoll', 'philipp-svinger', 'sgouezel'] |
nobody |
0-5195 1 hour ago |
21-24534 21 days ago |
77-73964 77 days |
5 |
| 44338 |
artie2000 author:artie2000 |
refactor: remove norm assumption for polynomial limits |
* Change proofs about limits of polynomials to avoid having to assume a norm on the field.
* Split the non-norm material from `Mathlib.Analysis.Polynomial.Basic`.
AI usage disclosure: Claude Sonnet 5.5 was used to come up with approaches for generalising the proofs. ChatGPT 5.5 was used to split material from discarded approaches into separate PRs. All of the changes in this PR were made by a human.
---
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|
t-algebra
t-topology
t-order
label:t-algebra$ |
352/225 |
Mathlib.lean,Mathlib/Algebra/Polynomial/Inductions.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Analysis/Polynomial/Basic.lean,Mathlib/Topology/Algebra/Order/Field.lean,Mathlib/Topology/Algebra/Order/Polynomial.lean |
6 |
7 |
['artie2000', 'github-actions', 'tb65536', 'vihdzp'] |
nobody |
0-4469 1 hour ago |
0-6244 1 hour ago |
3-15329 3 days |
0 |
| 41362 |
JovanGerb author:JovanGerb |
perf(Algebra/MonoidAlgebra): `no_expose` some operations |
This PR uses `no_expose` for the `Add`, `Sub`, `Neg`, `One` and `Mul` instances of `MonoidAlgebra`. This improves performance. The `Zero` instance is left exposed for now as no_exposing it would require a few more adaptations.
To achieve this, this PR changes `fast_instance%` in the same way that `inferInstanceAs` was changed recently in https://github.com/leanprover/lean4/pull/15216
---
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|
75/58 |
Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/MonoidAlgebra/Ideal.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/MonoidAlgebra/Module.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/CommRing.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/MvPowerSeries/Basic.lean,Mathlib/Tactic/FastInstance.lean |
17 |
18 |
['JovanGerb', 'github-actions', 'kbuzzard', 'leanprover-radar', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
0-2227 37 minutes ago |
0-4428 1 hour ago |
51-17915 51 days |
0 |
| 44939 |
JX-Mo author:JX-Mo |
feat(RepresentationTheory): add Schur's lemma for central elements |
`Algebra.lsmul` has type `End_k(V)` while Schur's lemma uses `End_A(V)`. We add a bridge lemma saying that central elements act as scalars. |
t-algebra label:t-algebra$ |
10/0 |
Mathlib/RepresentationTheory/AlgebraRepresentation/Basic.lean |
1 |
2 |
['github-actions'] |
nobody |
0-1103 18 minutes ago |
0-51123 14 hours ago |
0-51116 14 hours |
0 |
| 43108 |
tb65536 author:tb65536 |
chore(GroupTheory/Solvable): to_additivize file |
This PR to_additivizes `GroupTheory/Solvable.lean`.
---
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[](https://gitpod.io/from-referrer/)
|
t-algebra
t-group-theory
label:t-algebra$ |
84/23 |
Mathlib/GroupTheory/Abelianization/Defs.lean,Mathlib/GroupTheory/IsPerfect.lean,Mathlib/GroupTheory/Solvable.lean |
3 |
4 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
0-965 16 minutes ago |
34-36179 34 days ago |
48-48369 48 days |
0 |
| 44883 |
JovanGerb author:JovanGerb |
feat(ClickSuggestions): incorporate the `calc` widget |
This PR adds the `calc` widget into the `#click_suggestions` widget, whenever the cursor is at a `by` in the proof of a `calc` step. To do this, we have to extract the `Syntax` of the current command. Having access to this syntax may be useful in the future for other features.
This has not been tested much.
This PR doesn't make any changes to the `calc` widget itself, but we may want to de-activate it.
There is also the idea of integrating `rw`/`grw` suggestions with `calc`: instead of inserting a `rw` suggestion after the `by`, we could create a new `calc` step and prove it with the `rw` tactic. This is not done in this PR.
---
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|
t-meta
large-import
|
113/2 |
Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ClickSuggestions.lean,Mathlib/Tactic/ClickSuggestions/Calc.lean,Mathlib/Tactic/ClickSuggestions/Util.lean |
5 |
1 |
['github-actions'] |
nobody |
0-951 15 minutes ago |
0-5577 1 hour ago |
0-5570 1 hour |
0 |
| 44950 |
SnirBroshi author:SnirBroshi |
feat(Order/Atoms): atoms are minimal non-`⊥` elements |
- `Minimal (· ≠ ⊥) a ↔ IsAtom a`
- `Minimal (⊥ < ·) a ↔ IsAtom a`
- `Minimal (¬IsMin ·) a ↔ IsAtom a`
The first one works for preorders, and the others require a partial order.
---
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|
t-order |
16/0 |
Mathlib/Order/Atoms.lean |
1 |
1 |
['github-actions'] |
nobody |
0-772 12 minutes ago |
0-3510 58 minutes ago |
0-3503 58 minutes |
0 |
| 44943 |
JovanGerb author:JovanGerb |
fix(ClickSuggestions): display all `grw` side goals |
This PR fixes the `grw` suggestions in `#click_suggestions` in the case that `grw` creates a side goal, for example when using `grw` inside a multiplication, or inside `|·|` (both of which require positivity). Previously, these side goals were not shown, and only the side goals coming from the lemma were shown.
This doesn't come with a test because the change is just in what's in the widget, which we can't test easily.
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|
t-meta |
35/32 |
Mathlib/Tactic/ClickSuggestions/GRewrite.lean,Mathlib/Tactic/ClickSuggestions/TryPremises.lean |
2 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
0-547 9 minutes ago |
0-12481 3 hours ago |
0-32697 9 hours |
0 |
| 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 |
blocks |
| 35069 |
A-M-Berns author:A-M-Berns |
feat(Geometry/Polygon): simple polygons and boundary map |
This PR introduces Simple polygons with the predicate `IsSimple`, which captures the idea of a non-self-intersecting boundary, in the file Simple.lean. In the file Boundary.lean, a boundary map from `AddCircle n` is defined. I prove that the range of this map is the boundary and that this map is injective if and only if the polygon is simple. I kept Boundary.lean and Simple.lean separate because future results will include stuff just about the boundary map independent of simplicity (e.g. that it is continuous in the appropriate setting) and stuff just about simple polygons independent of the boundary map (e.g. that for n = 3, IsSimple iff HasNondegenerateVertices.) I used Claude Code to help generate some of the proof material, but I golfed and edited all AI contribution.
- [x] depends on: #34598
---
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new-contributor
t-euclidean-geometry
LLM-generated
|
360/0 |
Mathlib.lean,Mathlib/Geometry/Polygon/Boundary.lean,Mathlib/Geometry/Polygon/Simple.lean,Mathlib/Logic/Equiv/Fin/Rotate.lean |
4 |
30 |
['A-M-Berns', 'eric-wieser', 'github-actions', 'joneugster', 'jsm28', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp', 'wwylele'] |
nobody |
147-5200 4 months ago |
233-31055 233 days ago |
235-65334 235 days |
0 |
| 36813 |
AlexeyMilovanov author:AlexeyMilovanov |
feat(Computability.Encoding): add self-delimiting unary and pair encodings |
Adds self-delimiting boolean encodings to `Mathlib.Computability.Encoding`.
**Key changes:**
* **`unaryPrefixEncodingNat`**: A self-delimiting unary `Encoding ℕ Bool`, using the code $1^n0$.
* **`encodingProdBool`**: Builds an `Encoding (α × β) Bool` from boolean encodings of `α` and `β`, by prefixing the length of the first encoded component.
* **`encodingListBool`**: Builds an `Encoding (List α) Bool` from a boolean encoding of `α`, using self-delimiting element encodings.
* **`UnaryPrefix` helpers**: Internal-style helper API for the underlying length-prefixed boolean-list encoding and decoding. |
t-computability
new-contributor
|
98/0 |
Mathlib/Computability/Encoding.lean |
1 |
6 |
['AlexeyMilovanov', 'Komyyy', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts'] |
nobody |
100-38022 3 months ago |
100-38022 100 days ago |
116-80292 116 days |
0 |
| 36719 |
NoneMore author:NoneMore |
feat(ModelTheory): add `PartialType` for first-order theories |
This PR adds the definitions of partial types over theories and over parameter sets, and proves several equivalent characterizations.
---
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- [x] depends on: #36667
[](https://gitpod.io/from-referrer/)
|
t-logic
new-contributor
|
432/17 |
Mathlib.lean,Mathlib/ModelTheory/PartialTypes.lean,Mathlib/ModelTheory/Semantics.lean |
3 |
7 |
['NoneMore', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp'] |
nobody |
93-2921 3 months ago |
93-3442 93 days ago |
100-72796 100 days |
0 |
| 41934 |
NickKobs author:NickKobs |
feat(Order/Nucleus): a nucleus on a Boolean algebra is closed |
Adds `Mathlib/Order/Nucleus/Boolean.lean` — the Boolean specialization of the nucleus API:
```lean
theorem Nucleus.apply_eq_sup_apply_bot [BooleanAlgebra X] (n : Nucleus X) (a : X) :
n a = a ⊔ n ⊥
theorem Nucleus.isClosed_of_booleanAlgebra [BooleanAlgebra X] (n : Nucleus X) :
⇑n = fun a => a ⊔ n ⊥
theorem Nucleus.eq_of_apply_bot_eq [BooleanAlgebra X] {m n : Nucleus X} (h : m ⊥ = n ⊥) :
m = n
```
**Why.** `Mathlib.Order.Nucleus` provides the frame / Heyting-algebra structure of `Nucleus X`, the closure-operator view (`toClosureOperator`), and the pointwise `le_apply` / `idempotent` / `map_inf` API, but no Boolean specialization. On a Boolean algebra every nucleus is *closed* — completely determined by its value at `⊥` — which is the pointwise algebraic core of the classical fact that the assembly `N(L)` is Boolean iff `L` is (Beazer–Macnab; Simmons; Johnstone, *Stone Spaces*, II.2). It is the natural companion to the existing frame structure and a common building block in point-free topology.
**Proof.** `n a = n a ⊓ (a ⊔ aᶜ) = (n a ⊓ a) ⊔ (n a ⊓ aᶜ)`; the left join-and is `a` (inflationarity), the right is `≤ n a ⊓ n aᶜ = n (a ⊓ aᶜ) = n ⊥` (inflationarity of `aᶜ` + `map_inf`). The reverse inequality is inflationarity plus monotonicity applied to `⊥ ≤ a`. No completeness is needed — the statement is pointwise, so `[BooleanAlgebra X]` (not a complete Boolean algebra) suffices.
**References.**
* R. Beazer, D. S. Macnab, *Modal extensions of Heyting algebras*.
* H. Simmons, *A framework for topology*, Logic Colloquium '77.
* P. T. Johnstone, *Stone Spaces*, CUP (1982), II.2.
**Provenance.** The theorem was first mechanized (Mathlib-free, over a finite Boolean frame) in the BETTI/Araksha refusal-algebra work; this PR is the generalization to an arbitrary `BooleanAlgebra` against Mathlib's own `Nucleus` API. The result is classical open mathematics, cited above. An earlier revision of the file was compiled clean against master `c81c5cbb` (Lean `v4.33.0-rc1`); this revision adapts the header to the module system (`module` / `public import` / `@[expose] public section`).
|
t-order
new-contributor
LLM-generated
|
71/0 |
Mathlib.lean,Mathlib/Order/Nucleus/Boolean.lean |
2 |
5 |
['felixpernegger', 'github-actions'] |
nobody |
89-5957 2 months ago |
89-19700 89 days ago |
89-19693 89 days |
0 |
| 42047 |
LegaSage author:LegaSage |
feat(RingTheory): add locally nilpotent derivations |
This introduces `Derivation.IsLocallyNilpotent` and basic iteration lemmas for locally nilpotent derivations. The main result is the method-style theorem `Derivation.IsLocallyNilpotent.apply_eq_zero_of_dvd`: over a characteristic-zero domain, if `f ∣ D f` for a locally nilpotent derivation `D`, then `D f = 0`.
The proof uses the iterated Leibniz rule and the top nonvanishing iterates of the two factors.
-----
The implementation and PR text were prepared with assistance from OpenAI Codex. |
t-ring-theory
new-contributor
LLM-generated
|
167/0 |
Mathlib.lean,Mathlib/RingTheory/Derivation/LocallyNilpotent.lean |
2 |
2 |
['github-actions'] |
nobody |
84-52297 2 months ago |
85-3886 85 days ago |
85-3879 85 days |
0 |
| 42226 |
espottesmith author:espottesmith |
feat(Combinatorics/Hypergraph): add restriction `x ≠ y` to hypergraph vertex and edge adjacency |
---
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This introduces a small change to the definitions of adjacency and edge-adjacency for undirected hypergraphs, based on a conversation with @Jun2M and @b-mehta in [#28613](https://github.com/leanprover-community/mathlib4/pull/28613).
Previously, any two vertices (edges) `x` and `y` could be adjacent, provided that there was an edge in the edge set containing both of them (there was a vertex contained in both of them). Now, we add the restriction that `x` is not equal to `y`.
This should allow `SimpleGraph` to be a clean specialization of `Hypergraph` and to ease the eventual implementation of walks.
This PR has no dependencies, but see also [42164](https://github.com/leanprover-community/mathlib4/pull/42162), @Jun2M's implementation of `HyperGraphLike` and formalization that `Hypergraph`s are `HyperGraphLike`, which includes this restriction on `Adj`.
[](https://gitpod.io/from-referrer/)
|
t-combinatorics
new-contributor
|
4/4 |
Mathlib/Combinatorics/Hypergraph/Basic.lean |
1 |
3 |
['github-actions'] |
nobody |
79-64746 2 months ago |
79-65312 79 days ago |
79-65305 79 days |
0 |
| 42223 |
cameronfreer author:cameronfreer |
feat(Computability/Reduce): the halting problem is many-one complete |
`Mathlib/Computability/Halting.lean` proves that the halting problem is recursively enumerable (`ComputablePred.halting_problem_re`) and not computable (`ComputablePred.halting_problem`), but not that it is complete: there is no `REPred R → R ≤₀ K`, and neither `Halting.lean` nor `RE.lean` mentions `≤₀`.
This PR adds three results:
```lean
theorem REPred.manyOneReducible_halting_problem {R : ℕ → Prop} (h : REPred R) (n : ℕ) :
R ≤₀ fun c : Code => (Code.eval c n).Dom
theorem halting_problem_manyOneEquiv_halting_problem₂ (n : ℕ) :
ManyOneEquiv (fun c : Code => (Code.eval c n).Dom)
(fun p : Code × ℕ => (Code.eval p.1 p.2).Dom)
theorem REPred.manyOneReducible_halting_problem₂ {R : ℕ → Prop} (h : REPred R) :
R ≤₀ fun p : Code × ℕ => (Code.eval p.1 p.2).Dom
```
(I've stated the results in `Reduce.lean` rather than alongside the other halting-problem results because `≤₀` is defined here, and `Reduce` imports `Halting` rather than the other way around.)
🤖 These proofs were written with the assistance of Claude Opus 5 high and reviewed by GPT Sol 5.6 xhigh.
|
t-computability
new-contributor
LLM-generated
|
41/0 |
Mathlib/Computability/Reduce.lean |
1 |
3 |
['cameronfreer', 'github-actions'] |
nobody |
78-41435 2 months ago |
79-69243 79 days ago |
79-69236 79 days |
0 |
| 42189 |
cameronfreer author:cameronfreer |
feat(ModelTheory/Basic): add characterization of languages with countably many symbols |
`Language.Countable.countable_functions` currently projects `Countable L.Symbols` onto the function symbols, but there is no counterpart for relations. This PR adds the missing instance; in doing so it relates the two ways that Mathlib already expresses "countable language": the bundled `Language.card ≤ ℵ₀` and the unbundled `Countable (Σ l, L.Functions l)` / `Countable (Σ l, L.Relations l)` hypotheses that model-theoretic statements tend to carry separately.
* `Countable.countable_relations`, `countable_symbols_iff`, and `card_le_aleph0_iff_countable` connect the bundled and unbundled formulations of symbol countability.
* `Countable.countable_sum`, `Countable.countable_constantsOn`, and `Countable.countable_withConstants` centralize countability instances for language constructors and remove the corresponding local instances from `Encoding.lean`.
## Motivation
Following review feedback from @NoneMore, this PR now also simplifies existing Mathlib code: generic countability instances for `Language.sum`, `constantsOn`, and `withConstants` live beside those constructors, so `Encoding.lean` no longer needs its own cardinal-arithmetic proofs for them.
The broader motivation comes from projects in infinitary model theory that build on Mathlib, in which one typically needs to carry around a hypothesis about countability of the set of symbols.
Specifically, in [cameronfreer/infinitary-logic](https://github.com/cameronfreer/infinitary-logic) the two sorts are carried unbundled and independently throughout; there are roughly 180 occurrences of the relation-symbol hypothesis and 24 of the function-symbol one. Here are a few examples:
* [`Methods/Henkin/ModelExistence.lean#L60`](https://github.com/cameronfreer/infinitary-logic/blob/1a478e80794080a536931c029281bb65266b3171/InfinitaryLogic/Methods/Henkin/ModelExistence.lean#L60): model existence, carrying both hypotheses side by side;
* [`Admissible/Compactness.lean#L90`](https://github.com/cameronfreer/infinitary-logic/blob/1a478e80794080a536931c029281bb65266b3171/InfinitaryLogic/Admissible/Compactness.lean#L90): Barwise completeness, likewise;
* [`Descriptive/Polish.lean#L46`](https://github.com/cameronfreer/infinitary-logic/blob/1a478e80794080a536931c029281bb65266b3171/InfinitaryLogic/Descriptive/Polish.lean#L46): a section variable assuming only the relation symbols are countable, which is where one notices the missing companion instance;
* [`Methods/LopezEscobar/CodeClass.lean#L29`](https://github.com/cameronfreer/infinitary-logic/blob/1a478e80794080a536931c029281bb65266b3171/InfinitaryLogic/Methods/LopezEscobar/CodeClass.lean#L29): a custom `Countable (Σ n, L.Functions n)` instance for relational languages, which is an example of the bookkeeping that arises from the two sorts not being related by a single lemma.
(Note that the `countable_functions` and `countable_relations` instances only project *out of* `Countable L.Symbols` into a summand; the converse direction is stated as a theorem rather than an instance, so there is no risk of an instance cycle.)
🤖 These proofs were written with the assistance of Claude Opus 5 high and reviewed by GPT Sol 5.6 xhigh.
|
t-logic
new-contributor
LLM-generated
|
33/12 |
Mathlib/ModelTheory/Basic.lean,Mathlib/ModelTheory/Encoding.lean,Mathlib/ModelTheory/LanguageMap.lean |
3 |
5 |
['NoneMore', 'cameronfreer', 'github-actions'] |
nobody |
78-41409 2 months ago |
79-68181 79 days ago |
79-71382 79 days |
0 |
| 42178 |
cameronfreer author:cameronfreer |
feat(Computability/Primrec/List): add theorems showing that List.all, List.any and List.sum are primitive recursive |
Add the parameterized `list_all`, `list_any` and natural-number `list_sum`, in the style of the existing `list_map`, `list_foldr` and `list_findIdx`.
Mathlib already has a parameterized core, but no direct lemmas for these standard list operations, so downstream developments tend to reconstruct them from `list_foldr` at each use site. In the course of writing [cameronfreer/computable-analysis](https://github.com/cameronfreer/computable-analysis) I ended up needing this in three places, all of which can now make use of the results here instead (see [a6898b5](https://github.com/cameronfreer/computable-analysis/commit/a6898b5), in particular `Weihrauch/Principles/Limit.lean:117`, `TypeTwo/PrefixTable.lean:334,351,369`, and `Measure/DisintegrateLower.lean:877,902`).
:robot: These proofs were written with the assistance of Claude Opus 5 high and reviewed by GPT Sol 5.6 xhigh. |
t-computability
new-contributor
LLM-generated
|
21/1 |
Mathlib/Computability/Primrec/List.lean |
1 |
4 |
['cameronfreer', 'github-actions'] |
nobody |
78-41402 2 months ago |
80-61327 80 days ago |
80-61320 80 days |
0 |
| 42113 |
LAC1213 author:LAC1213 |
feat(RingTheory/Noetherian): injective modules over a Noetherian ring… |
… surject onto localizations by powers of an element. [Hartshorne III.3.3]
Disclaimer: I used Claude to help me find the names of useful lemmas and definitions and explain lean errors to me.
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|
t-ring-theory
new-contributor
LLM-generated
|
114/0 |
Mathlib.lean,Mathlib/Algebra/Module/Torsion/Basic.lean,Mathlib/RingTheory/Noetherian/InjectiveModule.lean |
3 |
42 |
['LAC1213', 'NoahW314', 'github-actions', 'robin-carlier'] |
nobody |
76-11073 2 months ago |
81-45662 81 days ago |
81-70383 81 days |
0 |
| 40741 |
AntoineduFresne author:AntoineduFresne |
feat(order): dilworth's and mirsky's theorems for finite orders |
I add Dilworth's theorem and its order dual, Mirsky's theorem, for finite subsets of a partial order, together with the order-theoretic lemmas they rest on.
A prior external formalization by Vlad Tsyrklevich is linked from `1000.yaml`; this is an independent `Finset`-based development using Galvin's proof, and I agreed the `1000.yaml` update with him.
I split the min-max content, as for Hall's marriage theorem, into a weak-duality inequality and a strong-duality existence of a matching pair, so I never define an extremal quantity over families of sets (no `Finset.min'` / `Finset.max'`):
- `dilworth` / `mirsky` — an antichain and a chain cover (resp. a chain and an antichain cover) of equal size;
- `antichain_le_chain_cover` / `chain_le_antichain_cover` — the weak-duality inequalities, for an arbitrary relation;
- `dilworth_partition` / `mirsky_partition` — the same with a pairwise-disjoint partition.
For Dilworth I use Galvin's induction (gluing step `chainCover_glue`); I avoid the König /
bipartite-matching route since König isn't in Mathlib yet (at least last time I checked). I prove Mirsky directly (peeling off minimal elements) rather than via `OrderDual`, since the direct induction seems simpler to me and the two proofs already share their foundations (the closure lemmas and the injective weak dualities).
Internally I work with an injection `f : α → Finset α` on the antichain rather than with the
`Finset (Finset α)` cover directly, so distinctness of the chains comes from the antichain property instead of a separate bookkeeping.
## Questions I'd like input on
1. Explicit min-max? I give weak duality plus a matching pair, from which "largest antichain = smallest chain cover" follows; I do not state that equality as a single theorem (doing so would, I think, mean defining the extremal quantities I wanted to avoid). Would you also like an explicit min-max statement?
2. Two layers of weak duality. I expose it twice: an injective form (`IsAntichain.exists_injOn_mem_chains`, over an arbitrary relation and an arbitrary index type, no finiteness) and a `Finset` cardinality form (`antichain_le_chain_cover`), the latter a one-line specialization of the former. I'm not sure whether exposing both is right, or whether one of them should be canonical. And is there appetite to push the general core to an `ℕ∞` / infinite version, or is the finite form the right scope here?
3. `[DecidableEq α]` on the main theorems. It comes only from writing the cover as
`s = 𝒞.biUnion id` (`Finset.biUnion` needs it); a membership-form coverage condition such as `∀ x, x ∈ s ↔ ∃ C ∈ 𝒞, x ∈ C` would drop the assumption, though it seems to me a bit less readable. Which do you prefer? (I think the injective-form weak dualities assume neither order, finiteness, nor `DecidableEq`.)
4. Naming. I use `C` / `A` for a chain / antichain and `𝒞` / `𝒜` for a chain / antichain cover (for hopefully obvious reason). Happy to change these if you would prefer something else.
## Open questions
- File placement (`Mathlib/Order/Dilworth.lean`?), and whether the general lemmas (the injective transversal and the weak dualities) should live in `Mathlib/Order/Antichain.lean` rather than in a new file.
The maximal-antichain closure lemma that was originally here has been split out into #42590.
Zulip: https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Antoine.20du.20Fresne.20von.20Hohenesche/with/604112426
AI use: I worked out all proofs on paper first and most of the design structure of the file. I then used Claude Code (Claude Opus) to transcribe my paper proofs into Lean, weaken hypotheses, reduce redundancy, and fix comment typos.
|
t-order
new-contributor
LLM-generated
|
568/3 |
Mathlib.lean,Mathlib/Order/Dilworth.lean,docs/1000.yaml |
3 |
18 |
['AntoineduFresne', 'SnirBroshi', 'github-actions', 'tdwag123'] |
nobody |
68-61316 2 months ago |
68-61948 68 days ago |
120-70406 120 days |
0 |
| 42265 |
cameronfreer author:cameronfreer |
chore(RingTheory/PowerSeries): simplify coeff_inv_aux |
This replaces the hand-written `Finset.sum_nbij'` in `coeff_inv_aux` with `simp_rw` + `simp`, via `Finsupp.antidiagonal_single`, the same rewrite that `PowerSeries.coeff_mul` already uses.
:robot: Golfing target found by GPT Pro 5.6 Sol, initial version of code written by Opus 5 high, refined by GPT 5.6 Sol xhigh, then again by Opus 5 high following @felixpernegger's review suggestion. |
t-ring-theory
new-contributor
LLM-generated
|
2/19 |
Mathlib/RingTheory/PowerSeries/Inverse.lean |
1 |
8 |
['cameronfreer', 'felixpernegger', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts'] |
nobody |
66-33270 2 months ago |
66-33970 66 days ago |
78-61373 78 days |
0 |
| 42718 |
justinhalford author:justinhalford |
feat(Combinatorics/SetFamily): the linear algebra method and the Oddtown theorem |
Adds the basic form of the **linear algebra method** for set families (Babai–Frankl) together with its standard first application, the **Oddtown theorem** (Berlekamp, 1969).
### What's here
- `linearIndependent_of_dotProduct_eq_ite` — a family of vectors whose pairwise dot products form the identity matrix is linearly independent. Stated over an arbitrary field, so it does not rely on positivity; this is the engine of the method.
- `Finset.charVec` — the characteristic vector of a finset, valued in a semiring, with `charVec_apply`.
- `Finset.charVec_dotProduct_charVec` — the dot product of two characteristic vectors is the cardinality of the intersection.
- `Finset.card_le_card_of_odd_card_of_even_card_inter` — **Oddtown**: a family of finsets of odd cardinality, any two of which meet in an even number of elements, has at most `Fintype.card α` members.
### Why
I could not find the linear algebra method anywhere in Mathlib. Searching for `Oddtown`, `Eventown`, Fisher's inequality, `RayChaudhuri` and `FranklWilson` returns nothing, and exactly one file under `Mathlib/Combinatorics/` uses `finrank`/`LinearIndependent` (`SimpleGraph/LapMatrix.lean`, for spectral graph theory). Since the technique underlies a large family of extremal results, the general lemma is stated separately from Oddtown so that Eventown, Fisher's inequality and Ray-Chaudhuri–Wilson can be added on top later.
If this does already exist under a formulation I did not think to search for, I would be glad to be pointed at it.
### Verification
Compiles against `master` (Lean 4.34.0-rc1) with no errors or warnings. `#print axioms` on each of the three results reports only `[propext, Classical.choice, Quot.sound]`. No `sorry`, no new axioms, no `set_option` overrides.
### Disclosure
This file was written with AI assistance (Claude Opus 5) and then checked against the Lean kernel; that is noted in the module docstring as well. Every statement, proof and docstring has been read through by me before submission. Happy to adjust naming, generality or placement to whatever the maintainers prefer.
### Process note
I am a first-time contributor and I am aware the usual convention is to raise a new file on Zulip before opening a PR. Apologies for going in the other order — I am glad to move the discussion to `#mathlib4` if that is preferred, or to close this if the material is not wanted.
---
[](https://gitpod.io/#https://github.com/leanprover-community/mathlib4)
|
t-combinatorics
new-contributor
|
144/0 |
Mathlib.lean,Mathlib/Combinatorics/SetFamily/Oddtown.lean |
2 |
3 |
['D-Thomine', 'github-actions'] |
nobody |
64-55267 2 months ago |
64-59751 64 days ago |
64-59744 64 days |
0 |
| 42343 |
brianrabern author:brianrabern |
feat(Combinatorics/SimpleGraph): extend a coloring to one more vertex |
Add `Colorable.of_induce_compl_singleton`: if deleting a vertex `v` leaves an `n`-colourable graph and `deg(v) < n`, then `G` itself is `n`-colourable.
This is a local colouring-extension / induction step (colour `G - v`, then assign `v` a free colour). It is useful for inductive arguments such as Brooks' theorem. The global greedy bound `χ ≤ Δ + 1` is developed separately in #38357.
AI assistance: LLM was used to smooth it out and put things in the expected style
---
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[](https://gitpod.io/from-referrer/) |
t-combinatorics
new-contributor
LLM-generated
|
35/0 |
Mathlib/Combinatorics/SimpleGraph/Coloring/Vertex.lean |
1 |
11 |
['Parcly-Taxel', 'SnirBroshi', 'bocowgill', 'brianrabern', 'github-actions'] |
nobody |
64-17229 2 months ago |
73-38662 73 days ago |
75-80175 75 days |
0 |
| 42788 |
andreylukin author:andreylukin |
feat(Combinatorics/Sperner): define facet incidence data |
## Summary
Adds a small finite facet-ridge incidence interface intended as a prerequisite for the general Sperner lemma (#25231).
- defines finite facets, ridges, and their incidence relation;
- assumes every ridge has one or two cofacets;
- defines boundary and interior ridges and proves that they are disjoint and partition the ridges.
This deliberately does not claim the geometric Sperner theorem. A future development must connect finite triangulations of the standard simplex to this incidence interface and establish the required coface-count property.
## Validation
- `lake build Mathlib.Combinatorics.Sperner.Basic`
- `lake env lean -DwarningAsError=false Mathlib.lean`
Towards #25231
|
t-combinatorics
new-contributor
|
117/0 |
Mathlib.lean,Mathlib/Combinatorics/Sperner/Basic.lean |
2 |
2 |
['github-actions'] |
nobody |
62-36733 2 months ago |
62-39428 62 days ago |
62-39541 62 days |
0 |
| 42758 |
cameronfreer author:cameronfreer |
feat(ModelTheory): add syntax and semantics for infinitary logic |
Add basic syntax and semantics for infinitary model theory of L∞ω (and Lω₁ω).
The new `BoundedFormulaInf L ι α n` uses index type `ι` for all of a formula's infinitary conjunctions and disjunctions, and the definitional
```lean
abbrev BoundedFormulaω (α : Type u') (n : ℕ) := L.BoundedFormulaInf ℕ α n
```
lands in exactly the universe of the finitary `BoundedFormula`, as suggested by @plp127 in [#mathlib4 > ModelTheory: API for infinitary formulas of L_{∞,ω} @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/ModelTheory.3A.20API.20for.20infinitary.20formulas.20of.20L_.7B.E2.88.9E.2C.CF.89.7D/near/613390601).
This PR contains `iSup`/`iInf` constructors, derived connectives together with `alls`/`exs`, `Realize` with `simp` lemmas for every constructor and derived connective, and the embedding `BoundedFormula.toInf` with `realize_toInf`.
I developed this with extensive assistance from several Claude and GPT models along with [lean4-skills](https://github.com/cameronfreer/lean4-skills) and [lean-lsp-mcp](https://github.com/oOo0oOo/lean-lsp-mcp) as part of the ongoing project [cameronfreer/infinitary-logic](https://github.com/cameronfreer/infinitary-logic/). |
t-logic
LLM-generated
new-contributor
|
446/0 |
Mathlib.lean,Mathlib/ModelTheory/Infinitary/Semantics.lean,Mathlib/ModelTheory/Infinitary/Syntax.lean,MathlibTest/InfinitarySyntax.lean |
4 |
4 |
['cameronfreer', 'github-actions'] |
nobody |
62-21371 2 months ago |
64-4272 64 days ago |
64-4265 64 days |
0 |
| 42540 |
shaikidris author:shaikidris |
feat(Combinatorics): asymptotic / natural density and linear-growth bridge |
Redefines asymptotic / natural density around a shared finite relative-density profile, instead of density along `SummationFilter`s.
* `Set.partialDensity S A b` — proportion of `A ∩ Iio b` in `S`
* `Set.lowerDensity` / `Set.upperDensity` — liminf / limsup of that profile
* `Set.HasDensity` — convergence of the profile; `Set.HasNaturalDensity` — `ℕ` case with `A = univ`
* Basic API: `[0,1]` bounds, empty/univ, finite sets have density `0`, `Finset.range` characterizations
* Drops the filter-parametric layer and the junk-valued `naturalDensity`
* Opt-in `Mathlib.Combinatorics.AsymptoticDensity.LinearGrowth`: exact lower/upper density equalities for the counting function `n ↦ #{x ∈ Finset.range n | x ∈ S}`, with no `LinearGrowth` dependency on the core density module
* Retargets the Schnirelmann TODO to this module; Schnirelmann-density comparison proofs are left for follow-up (the linear-growth bridge is proved here)
AI disclosure: this PR is primarily LLM-generated (OpenAI Codex). I reviewed the design (with review comments feedback), public APIs and edge-cases.
I primarily used these as part of my other project on quantitative descent and I think there is a merit in reusability.
---
---
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new-contributor
t-combinatorics
LLM-generated
|
358/2 |
Mathlib.lean,Mathlib/Combinatorics/AsymptoticDensity.lean,Mathlib/Combinatorics/AsymptoticDensity/LinearGrowth.lean,Mathlib/Combinatorics/Schnirelmann.lean |
4 |
16 |
['D-Thomine', 'b-mehta', 'github-actions', 'jcommelin', 'mathlib-bors', 'shaikidris', 'wwylele'] |
nobody |
60-59129 1 month ago |
66-62839 66 days ago |
69-81024 69 days |
0 |
| 42775 |
hawkrobe author:hawkrobe |
feat(RingTheory/HopfAlgebra): construct Hopf algebras from generators |
Upgrade a bialgebra to a Hopf algebra from antipode data on an algebra-generating set (`HopfAlgebra.ofGenerators`), plus the primitive-element form `HopfAlgebra.ofPrimitives`. Split out of #39841.
This looks more elegant using Sweedler notation (this proof was taken from a comment in #31898) but mathlib doesn't have the notation available as far as I know.
- [x] depends on: #39841 |
t-ring-theory
new-contributor
|
153/6 |
Mathlib.lean,Mathlib/RingTheory/HopfAlgebra/Generators.lean,Mathlib/RingTheory/HopfAlgebra/Primitive.lean |
3 |
3 |
['github-actions', 'mathlib-dependent-issues'] |
nobody |
59-60952 1 month ago |
60-73940 60 days ago |
61-2409 61 days |
1 |
| 42377 |
norbsvr author:norbsvr |
doc(1000.yaml): add Brauer's theorem on induced characters |
Claims a proof of [Q4958218:](https://www.wikidata.org/wiki/Q4958218) Brauer's theorem on induced characters.
The formalization is in an <a href="https://github.com/norbsvr/BrauerInduction/">external Lean 4 repository</a>. Please see file `README.md` for further information.
---
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Co-authors in the squash commit are gathered from two sources:
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each co-author among the commits in the pull request. If necessary, you
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any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
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below the `---`, and placed outside this HTML comment, or else they
will be invisible to reviewers.
If this PR depends on other PRs, please list them below this comment,
using the following format:
- [ ] depends on: #abc [optional extra text]
- [ ] depends on: #xyz [optional extra text]
-->
[](https://gitpod.io/from-referrer/)
|
new-contributor |
3/0 |
docs/1000.yaml |
1 |
3 |
['github-actions'] |
nobody |
48-19146 1 month ago |
75-25964 75 days ago |
75-25957 75 days |
0 |
| 42590 |
AntoineduFresne author:AntoineduFresne |
feat(Order/UpperLower/Closure): the upper and lower closures of a maximal antichain cover the order |
I add `IsMaxAntichain.upperClosure_union_lowerClosure`. It says that the upper and lower closures of a maximal antichain cover the whole order.
I put it right after `ordConnected_iff_upperClosure_inter_lowerClosure`, next to `upperClosure_inter_lowerClosure`, which seems the right spot.
The lemma is about antichains, so `Mathlib/Order/Antichain.lean` would have looked like the natural file to modify, but `upperClosure` is defined in `Mathlib/Order/UpperLower/Closure.lean`, which imports `Mathlib.Order.Interval.Set.OrdConnected`, which imports `Mathlib.Order.Antichain`. So to avoid an import loop I put it in `Closure.lean`.
I split this out of #40741, where a reviewer suggested it. Nothing in that PR uses the lemma.
|
t-order
new-contributor
|
13/0 |
Mathlib/Order/Antichain.lean,Mathlib/Order/UpperLower/Closure.lean |
2 |
12 |
['AntoineduFresne', 'Ruben-VandeVelde', 'SnirBroshi', 'github-actions', 'tdwag123'] |
nobody |
45-64968 1 month ago |
46-17028 46 days ago |
61-60456 61 days |
0 |
| 43128 |
dannyhe652 author:dannyhe652 |
feat(SimpleGraph/Coloring): add edge colorings and missing colors |
## Summary
This PR starts the edge-coloring API needed for Vizing's theorem.
It defines edge colorings as vertex colorings of the line graph, introduces edge
colorability and the chromatic index, and adds the basic local color-set API around a
vertex.
Main additions:
- `vizing.edgeColoring`
- `vizing.edgeColorable`
- `vizing.chromaticIndex`
- `vizing.incidentEdges`
- `vizing.incidentColors`
- `vizing.missingColors`
It also proves the basic cardinality estimates relating incident colors to vertex degree,
including that with more available colors than the degree, some color is missing at the
vertex.
This is the first PR in a stacked development toward Vizing's theorem.
## Co-authors
Co-authored-by: Daniel Raggi <dr495@cam.ac.uk>
Co-authored-by: Aristotle (Harmonic) <aristotle-harmonic@harmonic.fun>
Co-authored-by: Claude Opus 4.5 & 4.6 <noreply@anthropic.com>
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics
new-contributor
LLM-generated
|
271/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/EdgeColoring.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/KempeChain.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/KempeChain/Basic.lean |
4 |
6 |
['SnirBroshi', 'dannyhe652', 'github-actions'] |
nobody |
45-48063 1 month ago |
51-58565 51 days ago |
51-58654 51 days |
4 |
| 42468 |
Cobord author:Cobord |
feat: added lambda rings |
Description:
This does lambda rings. It is mostly over rationals so we can concern ourselves only with the psi^n operations and not the more complicated lambda^n operations. Doing the more general case could be another PR. This also includes the Getzler type formulation as the map involving Lambda_R the ring of symmetric functions in countably many variables (which again because R is assumed as [Algebra Q R] is described with it's power sum generators). That is to say the Plethystic action. Homomorphisms of such lambda rings are also covered. In particular, those of inclusions of subrings closed under those psi^n operations. In addition, one of the primary motivating examples of K(GL(n)/P) otimes_Z Q is described as such an instance to provide an example that is not Lambda_R.
This was done with Claude Code for generating initial versions but I had not given a good full prompt about prefering psi^n over lambda^n or using a structure instead of a prop in AdamsHom so I ended up rewriting most of those parts by hand anyway. The exception is the PrimeExtend file which is about only giving the psi^p instead of all of the psi^n, but abstracted away from those particular details per clarifying instructions after an initial version.
Because PrimeExtend is so much, this has a tag of
LLM-generated
In addition even though it is in RingTheory it is highly relevant to
t-combinatorics
in the sense of algebraic combinatorics due to use of ring of symmetric functions in countably many variables. |
t-ring-theory
new-contributor
t-combinatorics
LLM-generated
|
898/0 |
Mathlib.lean,Mathlib/RingTheory/LambdaRing/AdamsHom.lean,Mathlib/RingTheory/LambdaRing/AdamsOperations.lean,Mathlib/RingTheory/LambdaRing/KFlagExample.lean,Mathlib/RingTheory/LambdaRing/PrimeExtend.lean,Mathlib/RingTheory/LambdaRing/SymmetricFunctions.lean |
6 |
4 |
['Cobord', 'github-actions'] |
nobody |
45-10260 1 month ago |
67-35851 67 days ago |
67-36615 67 days |
0 |
| 43087 |
JX-Mo author:JX-Mo |
feat(RepresentationTheory): add Hecke/Basic.lean |
This file defines `HeckeModule` of a representation `ρ` as `Hom_G(k[G ⧸ H], ρ)` and identifies it
with the space of `H`-invariants. |
new-contributor
t-algebra
label:t-algebra$ |
87/0 |
Mathlib.lean,Mathlib/RepresentationTheory/Hecke/Basic.lean |
2 |
8 |
['JX-Mo', 'Whysoserioushah', 'github-actions'] |
nobody |
42-68115 1 month ago |
53-45058 53 days ago |
53-45153 53 days |
0 |
| 43672 |
javgomzar author:javgomzar |
chore(LinearAlgebra/Matrix): add push tags to transpose lemmas |
---
<!-- Your PR title will become the first line of the commit message.
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[](https://gitpod.io/from-referrer/)
|
t-algebra
new-contributor
label:t-algebra$ |
6/5 |
Mathlib/LinearAlgebra/Matrix/Defs.lean |
1 |
3 |
['github-actions'] |
nobody |
36-43123 1 month ago |
36-45657 36 days ago |
36-45650 36 days |
0 |
| 42424 |
lydia-schiff author:lydia-schiff |
feat(Order/Partition/Finpartition): transport a set partition along a type equivalence |
- Adds `Finpartition.congr` to transport a `Finpartition` along a type equivalence.
- We can use `Finpartition.map` if we have an order-iso, and the equivalence induces one via the new `Finset.congrOrderIso` which is based on `Equiv.finsetCongr`.
- Includes parts, card, refl, and round-trip lemmas.
---
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- `Equiv.finsetCongr` already gives us an equivalence of Finsets, so the new `Finset.congrOrderIso` just adds that the power-set lattice structure is also preserved.
- Includes lemmas showing that the parts are e-images of the old ones, card is preserved, and refl + round-trip for the equivalence.
- The cardinality lemma was the original motivation from some work on Stirling numbers, but I thought that `Finpartition.congr` and `Finset.congrOrderIso` seemed reusable and hopefully useful in their own right, and thought it would make a good first contribution.
- Zulip thread about naming and placement [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60Finpartition.2Econgr.60.20.E2.80.94.20naming.20.26.20placement)
- I used Claude Opus 4.8 to help draft the proofs and explore the API. I have spent several weeks making sure I understand and can justify every line and I've learned a lot which is great.
[](https://gitpod.io/from-referrer/)
|
t-order
LLM-generated
new-contributor
|
61/0 |
Mathlib/Data/Finset/Image.lean,Mathlib/Order/Partition/Finpartition.lean |
2 |
6 |
['github-actions', 'lydia-schiff', 'mathlib-merge-conflicts'] |
nobody |
36-26280 1 month ago |
36-30737 36 days ago |
63-15292 63 days |
0 |
| 41523 |
Harmenszoon author:Harmenszoon |
feat(Analysis/SpecialFunctions): add the Chase-Lovett diagonal reduction for binEntropy |
This PR adds the two-variable entropy inequality of Chase and Lovett ([arXiv:2211.11689](https://arxiv.org/abs/2211.11689), Lemma 2.2): for `x, y ∈ [0, 1]`,
```
x * binEntropy y + y * binEntropy x ≤ 2 * sqrt (x * y) * binEntropy (sqrt (x * y))
```
in a new leaf file `Mathlib/Analysis/SpecialFunctions/BinaryEntropy/Diagonal.lean`, together with its `negMulLog (1 - ·)` half (`Real.mul_negMulLog_one_sub_add_le`) and a `private` concavity layer for the comparison function `η u = exp u * negMulLog (1 - exp (-u))`. Two entries are added to `docs/references.bib` (Chase–Lovett arXiv:2211.11689, Boppana arXiv:2301.09664).
**Motivation.** This inequality is the reusable reduction step behind the recent entropic lower bounds for Frankl's union-closed sets conjecture (Gilmer; Alweiss–Huang–Sellke; Chase–Lovett; Sawin; Boppana): it reduces two-variable inequalities of Boppana type `K * (x * h y + y * h x) ≤ h (x * y)` to one-variable inequalities `2 * K * t * h t ≤ h (t ^ 2)`. `Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean` currently contains calculus basics for `binEntropy` only, and no inequality of this family; I checked current master for collisions before opening this. A kernel-checked downstream application — a complete Lean formalization of the union-closed lower bound at the constant `(3 - √5)/2` that uses exactly this reduction — is public at https://github.com/demonstrandum-research/artifacts (the `UCFrankl` development), which I maintain.
**Proof shape** (one page of calculus): substituting `x = exp (-u)`, the inequality becomes midpoint concavity of `η` on `[0, ∞)`; the `negMulLog (x * y)` parts of the two sides cancel exactly, the `negMulLog (1 - ·)` parts transfer to `η` via the identity `x * η (-log x) = negMulLog (1 - x)`, and `η'' ≤ 0` reduces to `log t ≤ t - 1`. Stating `η` through `negMulLog` absorbs the `0 * log 0` boundary behaviour, so no separate edge-case argument is needed at `x = 1`.
**Design notes / open questions for reviewers.**
- Hypotheses are stated as `0 ≤ x`/`x ≤ 1` pairs rather than `x ∈ Set.Icc 0 1`; happy to convert if the membership form is preferred.
- The `η`-machinery is `private`; it could be exposed if judged independently useful.
- File placement: a new `BinaryEntropy/Diagonal.lean` leaf keeps the import footprint of `BinaryEntropy.lean` unchanged (the proof needs `Analysis.Convex.Deriv`); merging into the main file is also possible if preferred.
- Naming: `mul_binEntropy_add_mul_binEntropy_le` / `mul_negMulLog_one_sub_add_le` follow the conclusion-based convention but I am glad to rename.
**AI disclosure** (per the [mathlib AI policy](https://leanprover-community.github.io/contribute/index.html)): the Lean code in this PR was generated by LLM agents (Anthropic's Claude, running in an agent pipeline that I operate under the name Demonstrandum), and was then compile-verified against mathlib and reviewed by me. This PR description was also prepared with AI assistance and reviewed by me. The proof is elementary calculus as summarized above; I understand it and take full responsibility for the contribution. I am adding the `LLM-generated` label as required. The downstream `UCFrankl` development linked above (kernel-checked, axioms `[propext, Classical.choice, Quot.sound]` only) is the evidence that the lemma carries real weight in applications.
---
- [x] depends on: nothing
|
t-analysis
LLM-generated
new-contributor
|
227/0 |
Mathlib.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy/Diagonal.lean,docs/references.bib |
3 |
5 |
['Harmenszoon', 'Timeroot', 'github-actions'] |
nobody |
36-5199 1 month ago |
99-80403 99 days ago |
99-80396 99 days |
0 |
| 43621 |
Whning0513 author:Whning0513 |
feat(Data/List): add basic API for toChunks |
Adds basic API lemmas for `List.toChunks`: flattening recovers the input, chunks are nonempty sublists, and their lengths are bounded by the chunk size.
This addresses the `Data/List/Basic: SP: toChunks` item in #7987.
Tests:
- `lake env lean Mathlib/Data/List/ToChunks.lean`
- `lake build Mathlib.Data.List.ToChunks`
- `lake exe runLinter Mathlib.Data.List.ToChunks`
AI use: OpenAI Codex was used to rebase the branch, run the checks above, and submit this pull request. The code and proofs were written and reviewed by the author. |
t-data
new-contributor
|
119/0 |
Mathlib.lean,Mathlib/Data/List/ToChunks.lean |
2 |
8 |
['copilot-pull-request-reviewer', 'github-actions', 'theebayuser'] |
nobody |
35-77319 1 month ago |
37-47149 37 days ago |
37-47142 37 days |
0 |
| 40050 |
ReemMelamed author:ReemMelamed |
feat(Algebra/Group/GreensRelations): add definitions for Green's relations |
This PR introduces the foundational definitions for Green's relations (L, R, H, D, and J) on semigroups.
This is the first in a series of PRs aimed at formalizing Green's relations for semigroups.
[Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Formalization.20of.20Green.27s.20Relations.20for.20semigroups/with/598557876)
---
- [x] depends on: #40843
|
t-algebra
new-contributor
label:t-algebra$ |
505/0 |
Mathlib.lean,Mathlib/Algebra/Group/GreensRelations/Basic.lean |
2 |
33 |
['ReemMelamed', 'YaelDillies', 'YanYablonovskiy', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues'] |
nobody |
35-55680 1 month ago |
35-56446 35 days ago |
55-47589 55 days |
1 |
| 43702 |
theebayuser author:theebayuser |
feat(LinearAlgebra/AffineSpace): add Varignon's theorem |
Hello, this PR introduces Varignon's theorem.
Varignon's theorem states that the midpoints of the sides of a quadrilateral form a parallelogram. More precisely, `midpoint_midpoint_midpoint_rotate` states: the two diagonals of the midpoint quadrilateral have the same midpoint.
This PR was written with AI assistance (Claude Code)
|
t-algebra
new-contributor
LLM-generated
label:t-algebra$ |
22/2 |
Mathlib/LinearAlgebra/AffineSpace/Midpoint.lean,docs/1000.yaml |
2 |
7 |
['github-actions', 'theebayuser', 'wwylele'] |
nobody |
35-36697 1 month ago |
35-82769 35 days ago |
35-82762 35 days |
0 |
| 42313 |
deancureton author:deancureton |
feat(RingTheory): embDomain composition and range, Laurent series expansion |
Add to the Hahn series API:
- `embDomain_embDomain` (composition of domain embeddings)
- `mem_range_embDomain_iff` (range of `embDomain` is characterized by support containment)
Add to the Laurent series API:
- the expansion ring endomorphism `LaurentSeries.expand` with its monomial and `orderTop` lemmas
- follows the pattern of `Polynomial.expand`, `MvPolynomial.expand`, `PowerSeries.expand`
- its opposite `LaurentSeries.contract`, with the decomposition of a Laurent series by exponent residues mod `n` (`sum_single_mul_expand_contract`) and its uniqueness (`contract_eq_of_sum_eq`)
- `exists_ofPowerSeries_eq_of_orderTop_nonneg`
This is the first of a series of PRs formalizing Puiseux series and Puiseux's theorem (entry 41 of Freek Wiedijk's 100 theorems list). |
t-ring-theory
new-contributor
LLM-generated
|
116/0 |
Mathlib/RingTheory/HahnSeries/Basic.lean,Mathlib/RingTheory/LaurentSeries.lean |
2 |
16 |
['deancureton', 'github-actions', 'wwylele'] |
nobody |
35-30054 1 month ago |
65-9299 65 days ago |
77-13027 77 days |
0 |
| 41241 |
intgrah author:intgrah |
feat(Order/Category): cartesian closed and distributive structure on PartOrd and Preord |
Give `PartOrd` and `Preord` `CartesianMonoidalCategory`, `MonoidalClosed`, and `IsCartesianDistributive` instances.
---
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[](https://gitpod.io/from-referrer/)
|
new-contributor
t-order
|
267/0 |
Mathlib.lean,Mathlib/Order/Category/PartOrd/CartesianClosed.lean,Mathlib/Order/Category/PartOrd/Colimits.lean,Mathlib/Order/Category/PartOrd/Reflective.lean,Mathlib/Order/Category/Preord/CartesianClosed.lean,Mathlib/Order/Category/Preord/Colimits.lean,Mathlib/Order/Category/Preord/Reflective.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean |
8 |
7 |
['github-actions', 'intgrah', 'thomaskwaring'] |
nobody |
35-28996 1 month ago |
37-10877 37 days ago |
107-47098 107 days |
0 |
| 42363 |
ghseeli author:ghseeli |
feat(Combinatorics): card_le_card_biUnion_of_card_le_card |
This PR contributes a lemma to combinatorics, `card_le_card_biUnion_of_card_le_card`. this is a set theoretic corollary of a double counting result proved for bipartite graphs (`Finset.sum_card_bipartiteAbove_eq_sum_card_bipartiteBelow`). This result was needed for our Latin Square PR https://github.com/leanprover-community/mathlib4/pull/36698. This result was proved in less general terms in that PR, but is independent of Latin Square considerations and so we have generalized and moved it into this file.
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics
new-contributor
|
38/0 |
Mathlib/Combinatorics/Enumerative/DoubleCounting.lean |
1 |
16 |
['cjrl', 'github-actions', 'vlad902', 'wwylele'] |
nobody |
33-16058 1 month ago |
63-5799 63 days ago |
75-83710 75 days |
1 |
| 42188 |
arcaputo3 author:arcaputo3 |
feat(Combinatorics/SimpleGraph): the line graph signature identity |
For a finite simple graph `G` with `n` vertices and `m` edges, we prove the classical identity
`s(A(L(G))) = n - m + p - q`
where `s` is the signature of the (real) adjacency matrix of the line graph `L(G)`, and `(p, q)` are the numbers of positive/negative eigenvalues of `Q(G) - 2•1`, with `Q(G) = D(G) + A(G)` the signless Laplacian, all counted with multiplicity.
The proof is the Gram-pairing argument: the `V × E(G)` incidence matrix `B` satisfies `Bᵀ * B = A(L(G)) + 2•1` and `B * Bᵀ = Q(G)`, and the two products have equal nonzero spectra by `Matrix.charpoly_mul_comm'`. Eigenvalue counts are transported along the resulting root-multiset identity.
New declarations:
- `Mathlib/Analysis/Matrix/Inertia.lean`: the inertia indices `Matrix.IsHermitian.posInertia` / `negInertia` / `signature` of a real symmetric matrix, and `Matrix.IsHermitian.charpoly_add_smul_one` / `roots_charpoly_add_smul_one` (the characteristic polynomial of `A + c • 1` splits over the shifted eigenvalues).
- `Mathlib/Combinatorics/SimpleGraph/LineGraphSignature.lean`: `SimpleGraph.signlessLapMatrix`, `SimpleGraph.edgeIncMatrix` (the `V × E(G)`-indexed incidence matrix) together with the two Gram identities above (stated over an arbitrary (non-assoc) semiring), a `DecidableRel` instance for `lineGraph.Adj`, and the main theorem `SimpleGraph.signature_adjMatrix_lineGraph`.
---
**AI disclosure** (per the mathlib policy on AI-assisted contributions): this PR was formalized end-to-end with Claude Code (Anthropic model Claude Fable 5). The choice of statement and the decision to contribute are mine; the Lean proofs were authored by the tool and verified by compilation. `#print axioms SimpleGraph.signature_adjMatrix_lineGraph` reports `[propext, Classical.choice, Quot.sound]`.
Notes for reviewers:
- `signlessLapMatrix` could alternatively live in `Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean`, and the `DecidableRel G.lineGraph.Adj` instance in `LineGraph.lean`; happy to move them.
- The inertia API is deliberately minimal (what the main theorem needs); extensions (e.g. rank/inertia relations, congruence invariance / Sylvester's law) would be natural follow-ups.
- I do not yet have push access to non-master mathlib branches, so this PR comes from a fork; happy to move the branch onto the main repository once access is granted.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
new-contributor
LLM-generated
t-combinatorics
|
326/0 |
Mathlib.lean,Mathlib/Analysis/Matrix/Inertia.lean,Mathlib/Combinatorics/SimpleGraph/LineGraphSignature.lean |
3 |
2 |
['github-actions'] |
nobody |
27-7890 27 days ago |
80-43905 80 days ago |
80-43898 80 days |
0 |
| 42971 |
ashebson author:ashebson |
fix(ProfiniteGrp): simplify explicit limit projections |
The naturality proof for `ProfiniteCompletion.lift` previously needed a brittle pointwise `change`. The underlying problem was that simplification crossed several semireducible diagram/forgetful-functor boundaries at once, producing terms that are definitionally equal but no longer type-correct at implicit transparency.
This PR:
- makes the two finite-quotient diagram composites reducible abbreviations;
- states `quotientMap` using the diagram object types and maps it through the existing `FiniteGrp ⥤ ProfiniteGrp` forgetful functor;
- adds a pointwise rewrite lemma for an explicit limit projection followed by a mapped finite-group morphism (with its additive counterpart); and
- rewrites `ProfiniteCompletion.lift` naturality through that API while keeping the limit point bundled, removing the problematic pointwise `change`.
--------
## AI disclosure
AI (OpenAI Codex) was used extensively for this PR. It was used to:
- investigate the original TODO and reproduce why `dsimp` failed;
- explore and discard several possible fixes;
- identify the semireducible diagram/forgetful-functor boundaries involved;
- design and implement the final `ProfiniteGrp` API simplification and `ProfiniteCompletion.lift` proof changes;
- run the relevant Lean builds and direct compilation checks; and
- draft the commit message and PR description.
The final changes were reviewed through the resulting diff and verified locally.
|
t-topology
new-contributor
LLM-generated
|
29/12 |
Mathlib/Topology/Algebra/Category/ProfiniteGrp/Basic.lean,Mathlib/Topology/Algebra/Category/ProfiniteGrp/Completion.lean,Mathlib/Topology/Algebra/Category/ProfiniteGrp/Limits.lean |
3 |
9 |
['ashebson', 'github-actions', 'grunweg', 'mathlib-bors', 'mathlib-merge-conflicts'] |
nobody |
26-68190 26 days ago |
26-69412 26 days ago |
40-28192 40 days |
0 |
| 43886 |
gabriel-turinici author:gabriel-turinici |
feat(Analysis/Asymptotics): add Filter.Tendsto.weighted_cesaro_smul |
Adds `Filter.Tendsto.weighted_cesaro_smul`, a weighted (Toeplitz-type) generalization of `Filter.Tendsto.cesaro_smul`: if `S k → L` and `w k ≥ 0` has divergent partial sums, the weighted running average of `S` w.r.t. `w` also tends to `L`. Recovers `cesaro_smul` as the `w ≡ 1` case. Also adds `weighted_cesaro`, the real-valued convenience wrapper mirroring `cesaro`.
This is a small building block toward a planned follow-up PR formalizing Kronecker's lemma, at its turn needed in some stochastic analysis setting.
---
**AI disclosure**: this proof was developed using formatting assistance, library search and code corrections from Claude Code (Claude Sonnet 5) and a personal LLM automation. Alternative, shorter, proofs can be obtained with `IsLittleO`-style but that style seems too recent for me now.
[](https://gitpod.io/from-referrer/) |
t-analysis
new-contributor
LLM-generated
|
81/0 |
Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean |
1 |
2 |
['github-actions'] |
nobody |
26-47499 26 days ago |
30-16478 30 days ago |
30-16471 30 days |
0 |
| 29744 |
espottesmith author:espottesmith |
feat(Combinatorics): define directed hypergraphs |
This PR defines directed hypergraphs:
```
@[ext]
structure DiHypergraph (α : Type*) where
/-- The vertex set -/
vertexSet : Set α
/-- The edge set -/
edgeSet : Set ((Set α) × (Set α))
/-- Each edge is a pair (s, d), where s ⊆ vertexSet and d ⊆ vertexSet -/
edge_src_dst_isSubset_vertexSet' : ∀ ⦃e⦄, e ∈ edgeSet → e.1 ⊆ vertexSet ∧ e.2 ⊆ vertexSet
```
Additional definitions:
- tail/head stars and negative/positive stars
- some special cases (B-Graph, F-Graph, BF-Graph, and what I'm calling a "non-endless" dihypergraph, where neither the source/tail nor the destination/head are empty)
- Vertex and (hyper)edge adjacency
- isolated vertices
- empty and nonempty dihypergraphs
The design employed here is based off of #28613, but this PR does not depend on that one.
---
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics
new-contributor
|
290/0 |
Mathlib.lean,Mathlib/Combinatorics/DiHypergraph/Basic.lean |
2 |
12 |
['SnirBroshi', 'b-mehta', 'espottesmith', 'github-actions', 'mathlib4-merge-conflict-bot', 'pimotte'] |
nobody |
26-32417 26 days ago |
117-40639 117 days ago |
254-44380 254 days |
1 |
| 43780 |
SashaIr author:SashaIr |
feat: q-analogs |
An implementation of q-analogs, q-binomials, and counting results.
---
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[](https://gitpod.io/from-referrer/)
|
new-contributor
t-combinatorics
|
965/0 |
Mathlib.lean,Mathlib/Combinatorics/QAnalog/Basic.lean,Mathlib/Combinatorics/QAnalog/Binomial.lean,Mathlib/Combinatorics/QAnalog/Counting.lean,Mathlib/Combinatorics/QAnalog/Subspace.lean |
5 |
7 |
['SashaIr', 'SnirBroshi', 'b-mehta', 'github-actions'] |
nobody |
26-23160 26 days ago |
33-21130 33 days ago |
33-21479 33 days |
0 |
| 38334 |
8e7 author:8e7 |
feat(Combinatorics/SimpleGraph/TreeDecomp): define tree decompositions |
Add definition for tree decompositions on simple graphs. Define the tree width of a simple graph and prove basic statements and conversions.
```lean
structure TreeDecomp (G : SimpleGraph V) (W : Type) where
/-- The set of vertices in each bag. -/
bag : W → Finset V
/-- The graph adjacency relation of bags. -/
tree : SimpleGraph W
/-- T must be a tree. -/
isTree : IsTree tree
/-- All vertices in G must appear in some bag. -/
vertexCover : ∀ v : V, ∃ w : W, v ∈ bag w
/-- For any edge (u, v) in G, there is a bag containing both u and v. -/
edgeCover ⦃u v : V⦄ : G.Adj u v → ∃ w : W, u ∈ bag w ∧ v ∈ bag w
/-- For any vertex v in G, the set of bags that contain v is preconnected. -/
connectedBags : ∀ v : V, (tree.induce ({w | v ∈ bag w})).Preconnected
```
AI Usage: Some proofs are written with the help of Claude Code, and everything has been manually reviewed.
---
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- [x] depends on: #38027
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-combinatorics
LLM-generated
|
395/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/TreeDecomp.lean |
2 |
42 |
['8e7', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts'] |
nobody |
26-5201 26 days ago |
82-79639 82 days ago |
106-62967 106 days |
1 |
| 43953 |
hasjack author:hasjack |
feat(Combinatorics/SimpleGraph/LapMatrix): bound Laplacian eigenvalues by `|V|` |
Prove that every Laplacian eigenvalue of a finite simple graph is at most
the number of vertices, via comparison of the Rayleigh quotient with the
complete graph. Also record the underlying quadratic-form bound
`xᵀ L x ≤ |V| · ‖x‖²`.
---
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[](https://gitpod.io/from-referrer/)
Adds `dotProduct_mulVec_lapMatrix_le_card` and `eigenvalues_lapMatrix_le_card`
in `LapMatrix.lean` only. The claim is the uniform bound `λ ≤ |V|` for every
indexed eigenvalue; it does not assert `|V| ∈ spectrum` for every graph.
Searched existing LapMatrix API (PSD, `zero_mem_spectrum_lapMatrix`,
`lapMatrix_top`) and did not find a card upper bound under another name.
Happy to rename if a preferred lemma already exists. |
new-contributor
t-combinatorics
LLM-generated
|
37/1 |
Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Mul.lean |
2 |
61 |
['Parcly-Taxel', 'SnirBroshi', 'github-actions', 'hasjack'] |
nobody |
25-49513 25 days ago |
26-10132 26 days ago |
28-4261 28 days |
0 |
| 41947 |
hawkrobe author:hawkrobe |
feat(Order/Antisymmetrization): comparable minimal elements are equivalent |
a minimal element is antisymmetrically equivalent to every comparable element satisfying the predicate, so two comparable minimal elements are equivalent in a preorder and equal in a partial order (Mathlib has the partial-order form `Minimal.eq_of_ge` but not the preorder form.)
---
[](https://gitpod.io/from-referrer/) |
new-contributor
t-order
|
25/4 |
Mathlib/Logic/Relation.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Bounds/Basic.lean |
3 |
3 |
['github-actions', 'hawkrobe'] |
nobody |
25-38776 25 days ago |
88-82824 88 days ago |
88-82817 88 days |
0 |
| 44099 |
xiahongchi author:xiahongchi |
feat: maximize concave functions at stationary points |
Adds two first-order maximum principles for real concave functions:
* `ConcaveOn.le_of_hasDerivAt_eq_zero`
* `ConcaveOn.isGreatest_of_hasDerivAt_eq_zero`
They use the existing secant-slope bounds and require differentiability only at the candidate maximizer.
Tested by compiling `Mathlib/Analysis/Convex/Deriv.lean` locally. |
t-analysis
new-contributor
|
31/0 |
Mathlib/Analysis/Convex/Deriv.lean |
1 |
3 |
['github-actions'] |
nobody |
24-5967 24 days ago |
24-7197 24 days ago |
24-7190 24 days |
0 |
| 44103 |
xiahongchi author:xiahongchi |
feat: equate derivatives of ordered functions at contact points |
This adds Fréchet-derivative and scalar-derivative lemmas saying that two everywhere-ordered real-valued functions have equal derivatives wherever they agree. The proof applies Fermat’s theorem to their nonnegative difference.
This packages and generalizes the scalar envelope argument from Bryan Sanchez’s `NSBlwChain/Caveats/C2_Envelope.lean` at `Brsanch/ns-lean-proofs@b73f537d1646165fbdc0993c5b2e223355dc3469` (MIT).
The new declarations elaborate under the released toolchain; compiling the current master file there reports only one pre-existing current-Lean field-notation incompatibility before the new code. Current-toolchain CI is authoritative. |
t-analysis
new-contributor
|
20/0 |
Mathlib/Analysis/Calculus/LocalExtr/Basic.lean |
1 |
2 |
['github-actions'] |
nobody |
24-4282 24 days ago |
24-5541 24 days ago |
24-5831 24 days |
0 |
| 41728 |
vaca22 author:vaca22 |
feat(GroupTheory): prove uniqueness of ℤᵐ⁰ automorphisms |
Prove that every order-preserving multiplicative automorphism of ℤᵐ⁰ is the identity. This also gives a Unique instance for its automorphism type and a Subsingleton instance for order-preserving multiplicative normalizations from G to ℤᵐ⁰.
The proof transports an automorphism through WithZero.exp and WithZero.log to an additive automorphism of ℤ, then excludes negation by monotonicity.
------------
**AI disclosure**: this PR is primarily LLM-generated (Claude Code).
|
t-group-theory
new-contributor
LLM-generated
|
58/0 |
Mathlib/GroupTheory/ArchimedeanDensely.lean |
1 |
16 |
['github-actions', 'grunweg', 'tb65536', 'vaca22', 'wwylele'] |
nobody |
23-81508 23 days ago |
41-40495 41 days ago |
55-85030 55 days |
0 |
| 44137 |
MrBrain295 author:MrBrain295 |
chore(Combinatorics/SimpleGraph): golf `Coloring.odd_length_iff_not_c… |
…ongr`
---
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- Vector.* -> List.Vector.*
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- Nat.bit1_add_bit1
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-->
|
t-combinatorics
new-contributor
|
1/2 |
Mathlib/Combinatorics/SimpleGraph/Coloring/Constructions.lean |
1 |
2 |
['github-actions'] |
nobody |
23-37786 23 days ago |
23-39029 23 days ago |
23-39022 23 days |
0 |
| 42955 |
mpacholski author:mpacholski |
feat(diffgeo): add Hom-bundle support and fix pullback base points in T% elaborator |
# Changes
## `Mathlib/Geometry/Manifold/Notation.lean`
* **Add support for pullback bundles:** Replaced the hardcoded bound variable `x` with the dynamically extracted argument `arg`, which allows for using elaborator `T%` with pullback bundles, where the base point lies in a different manifold, e.g. `v : Π (m : M), E₁ (b m)`, where `b : M → B`.
* **Add support for Hom-bundles:** The elaborator now supports sections of Hom-bundles (`ContinuousLinearMap` between two fiber bundles, e.g. `ϕ : ∀ x, (E₁ x →L[𝕜] E₂ x`). It also supports the case where the base point lies in a different manifold (e.g. `ϕ : ∀ x, (E₁ (b x) →L[𝕜] E₂ (b x))`)
* **Support nested `TangentSpace`:** Modified `findModelFiber?` to natively intercept `TangentSpace` applications and extract the model fiber at index 2. This prevents typeclass synthesis failures when `TangentSpace` is used inside a Hom-bundle.
## `MathlibTest/DifferentialGeometry/Notation/Basic.lean`
* **Added tests for all the new usecases** this includes pullback bundles, Hom-bundles, pullback Hom-bundles, and Hom-bundles where one of the fibers is a `TangentSpace`.
## `Mathlib/Geometry/Manifold/VectorBundle/Hom.lean`
* **Refactor `Hom.lean`:** Replaced verbose `TotalSpace.mk'` boilerplate in with the newly supported `T%` syntax (e.g. `MDiffAt[s] T% ϕ x` instead of `MDiffAt[s] (fun m ↦ TotalSpace.mk' (F₁ →L[𝕜] F₂) (E := fun (x : B) ↦ (E₁ x →L[𝕜] E₂ x)) (b m) (ϕ m)) x)`
# Use of AI
The help of AI was used in writing the code in `Mathlib/Geometry/Manifold/Notation.lean`. It was hence manually edited to simplify the code as much as possible. While the author is not yet an expert in metaprogramming in Lean, he is willing to learn and receive feedback, and put all the effort to understand the presented code. The code was carefully tested with different parts of it changed and removed to make sure that every line serves a purpose to provide the expected functionality.
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[](https://gitpod.io/from-referrer/)
|
t-differential-geometry
new-contributor
LLM-generated
|
127/36 |
Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Geometry/Manifold/VectorBundle/Hom.lean,MathlibTest/DifferentialGeometry/Notation/Basic.lean |
3 |
5 |
['github-actions', 'grunweg', 'mpacholski'] |
nobody |
22-5198 22 days ago |
57-40810 57 days ago |
57-40803 57 days |
3 |
| 44221 |
SamuelSchlesinger author:SamuelSchlesinger |
feat(Combinatorics/SetFamily): erdős–rado sunflower lemma |
Define `Set.IsSunflower`, a family of elements of a meet-semilattice whose distinct members pairwise meet in a fixed kernel, with a basic API around it, and then prove the Erdős–Rado sunflower lemma: a family of more than `(p - 1) ^ r * r !` finsets of size at most `r` contains a sunflower with `p` petals, together with the uniform special case.
I use this downstream to show circuit lower bounds on the clique language, but it is used in various areas of complexity and combinatorics.
This PR was assisted by Claude Opus 5.5. In particular, I extracted this from another formalization project that was also assisted by AI.
---
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|
t-combinatorics
new-contributor
LLM-generated
|
215/0 |
Mathlib.lean,Mathlib/Combinatorics/SetFamily/Sunflower.lean,docs/references.bib |
3 |
4 |
['SamuelSchlesinger', 'github-actions'] |
nobody |
20-73060 20 days ago |
20-75341 20 days ago |
20-75334 20 days |
0 |
| 44222 |
SamuelSchlesinger author:SamuelSchlesinger |
feat(Analysis/SpecialFunctions/Stirling): asymptotics of the central binomial coefficient |
Upstreaming `n.centralBinom ~ 4 ^ n / √(π * n)` and its `4 ^ n`-normalised corollaries,
needed for a Razborov–Smolensky `AC⁰[p]` lower bound in a circuit-complexity formalization,
together with the Catalan asymptotic `catalan n ~ 4 ^ n / (√π * n ^ (3 / 2))` as a first
application in Mathlib.
Drafted with Claude Code from my existing proof of the same statement, then revised by me
against Mathlib conventions.
---
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|
t-analysis
LLM-generated
new-contributor
|
85/1 |
Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Combinatorics/Enumerative/Catalan/Asymptotics.lean |
3 |
4 |
['SamuelSchlesinger', 'github-actions'] |
nobody |
20-72272 20 days ago |
20-73193 20 days ago |
20-73186 20 days |
0 |
| 41258 |
ungatz author:ungatz |
feat(Analysis/Fourier/FiniteAbelian): add the Donoho-Stark support uncertainty principle |
This adds the Donoho–Stark support uncertainty inequality for the unitary Fourier transform on a finite abelian group, plus the supporting Fourier-inversion machinery indexed by the Pontryagin dual `AddChar G ℂ`.
The headline:
> **Theorem `AddChar.donoho_stark`.** For nonzero `f : G → ℂ`,
> `Fintype.card G ≤ (support f).ncard * (support (fourierTransform f)).ncard`,
> where `fourierTransform f ψ = |G|^(-1/2) * ∑ g, conj (ψ g) * f g` ranges over `ψ : AddChar G ℂ`.
The proof is the elementary (L¹, L∞) duality argument that any harmonic-analysis textbook gives for the classical `ZMod N` case; no Parseval or Cauchy–Schwarz is needed. The finite-abelian generalisation is folklore (stated in Tao–Vu *Additive Combinatorics* and Terras *Fourier Analysis on Finite Groups*); I did not find it formalised in Mathlib or any other major library.
### Why this belongs in Mathlib
Mathlib already has the supporting infrastructure — character theory of finite abelian groups (`Mathlib.Algebra.Group.AddChar`), character orthogonality and Pontryagin duality (`Mathlib.Analysis.Fourier.FiniteAbelian.{Orthogonality, PontryaginDuality}`). The Donoho–Stark inequality is the canonical application of all three, and its absence is a real gap: I needed it for a downstream operator-uncertainty result (a diagonal-operator `rank * Pauli-support` bound on the finite Heisenberg group reduces to it) and ended up proving it from scratch. Beyond that use, it is a standard tool in compressed sensing on finite abelian groups, additive combinatorics, and discrete signal recovery (the 1989 paper has ~3500 citations).
### What's in this PR
A single new file, `Mathlib/Analysis/Fourier/FiniteAbelian/DonohoStark.lean`:
- `AddChar.fourierTransform` — the unitary (symmetric) Fourier transform indexed by `AddChar G ℂ`;
- `AddChar.fourier_inversion` — the inversion formula;
- `AddChar.norm_fourierTransform_le`, `AddChar.norm_le_sum_norm_fourierTransform` — the two `L∞ ≤ |G|^(-1/2) · L¹` triangle bounds;
- `AddChar.donoho_stark` — the support uncertainty inequality.
Design choices I expect questions on, and my defaults:
- **`ℂ` rather than `RCLike`**: matches the cited literature and the cleanest home of `AddChar.norm_apply`; happy to generalise if preferred.
- **`Set.ncard` for support sizes**: avoids needing `DecidableEq ℂ` in the statement.
- **A new sibling file** of `Orthogonality.lean` / `PontryaginDuality.lean` rather than a subsection: orthogonality is the tool, Donoho–Stark is the application; can inline if preferred.
Deliberately *not* included: the diagonal-operator `rank * Pauli-support ≥ 2^n` corollary from my workspace — the Pauli-word machinery has no natural home in `Analysis/Fourier` yet; happy to factor it into a follow-up if there is interest.
### AI usage disclosure
Per the [AI contribution policy](https://leanprover-community.github.io/contribute/index.html): the original Lean proof was generated by **Aristotle** (Harmonic AI's automated proof system) from a dispatch containing the statement and the (L¹, L∞) proof strategy, as part of my PhD research workspace. I audited the delivery line by line against Donoho–Stark 1989 (the dispatch also produced a kernel-checked counterexample to a tempting wrong variant — replacing rank by the count of distinct eigenvalues — which the 2×2 identity falsifies). The file here is my adaptation to Mathlib conventions and to current master (module system, `Set.ncard` statement, robust cast handling in the inversion proof), with final tactic-level repairs done with the assistance of Claude (Anthropic). I understand and can defend every line without AI assistance. Please add the `LLM-generated` label (I cannot set labels myself).
### Test plan
- [x] `lake build Mathlib.Analysis.Fourier.FiniteAbelian.DonohoStark` clean (0 errors, 0 warnings).
- [x] `#print axioms` on all five declarations: `[propext, Classical.choice, Quot.sound]`.
- [x] `lake exe lint-style` clean; all lines ≤ 100 chars.
- [x] `Mathlib.lean` updated in alphabetical position.
- [x] Imports minimal (`PontryaginDuality` + `RCLike.Basic` only).
### Reference
Donoho, D. L. and Stark, P. B. (1989). *Uncertainty principles and signal recovery.* SIAM Journal on Applied Mathematics, **49**(3): 906–931. https://doi.org/10.1137/0149053
---
|
t-analysis
new-contributor
LLM-generated
|
283/0 |
Mathlib.lean,Mathlib/Analysis/Fourier/FiniteAbelian/DonohoStark.lean |
2 |
4 |
['YaelDillies', 'copilot-pull-request-reviewer', 'felixpernegger', 'github-actions'] |
fpvandoorn assignee:fpvandoorn |
20-6093 20 days ago |
107-11780 107 days ago |
107-11773 107 days |
0 |
| 37456 |
Robertboy18 author:Robertboy18 |
feat(LinearAlgebra/AffineSpace): add parallel form of Desargues's theorem |
This PR adds an affine parallel form of the Desargues theorem, following the related Rocq/Coq affine-geometry statement.
**Main changes**
- New file `Mathlib/LinearAlgebra/AffineSpace/Desargues.lean` with `parallel_third_side_of_perspective`.
- Add the corresponding `public import` to `Mathlib.lean`.
**Proof idea**
The proof compares side vectors using `exists_eq_smul_of_parallel` for the two given pairs of parallel sides. The shared comparison along `SA` forces the same scalar, which gives parallelism of the third pair of sides.
Tests: `lake build Mathlib.LinearAlgebra.AffineSpace.Desargues`
AI disclosure: GPT-5.2 Pro was used for assistance with web search/background details about the theorem and for finding useful existing Mathlib lemmas. The theorem statement and Lean formalization were written and checked by hand.
---
[](https://gitpod.io/from-referrer/) |
t-algebra
new-contributor
LLM-generated
label:t-algebra$ |
133/0 |
Mathlib.lean,Mathlib/LinearAlgebra/AffineSpace/Desargues.lean |
2 |
22 |
['Robertboy18', 'SnirBroshi', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'wwylele'] |
nobody |
20-5201 20 days ago |
41-36253 41 days ago |
66-58162 66 days |
0 |
| 36937 |
Yaohua-Leo author:Yaohua-Leo |
feat(Algebra/Jordan): add first linearization lemmas for IsCommJordan |
[](https://gitpod.io/from-referrer/)
AI assistance disclosure: I used AI assistance for CI/debugging and module-structure fixes in this PR. The mathematical content and main lemmas were written by me, with help from @pelicanhere.
This PR adds a new file `Mathlib/Algebra/Jordan/Linearization.lean` containing linearization lemmas for the commutative Jordan identity.
Main declarations:
* `IsCommJordan.four_nsmul_associator_mul_add`
* `IsCommJordan.associator_mul_add`
These lemmas formalize a first linearization of the commutative Jordan identity using `associator`, following McCrimmon, Proposition 1.8.5.
---
I put these lemmas in a separate file because I expect follow-up linearization lemmas to belong naturally in the same place.
I am also happy to rename declarations or move the file if reviewers would prefer. |
t-algebra
new-contributor
label:t-algebra$ |
152/90 |
Mathlib.lean,Mathlib/Algebra/Jordan/Basic.lean,Mathlib/Algebra/Jordan/Linearization.lean |
3 |
8 |
['Yaohua-Leo', 'github-actions', 'grunweg', 'ocfnash'] |
ocfnash assignee:ocfnash |
18-73642 18 days ago |
19-10416 19 days ago |
32-21219 32 days |
0 |
| 42720 |
justinhalford author:justinhalford |
feat(Order/KrullDimension): level sets of height are antichains |
Adds one lemma to `Mathlib/Order/KrullDimension.lean`, directly after `height_strictMono`:
```lean
lemma isAntichain_lt_height_preimage {n : ℕ∞} (hn : n ≠ ⊤) :
IsAntichain (· < ·) {x : α | height x = n}
```
Elements sharing a common *finite* height are pairwise incomparable — the level sets of `height` are antichains.
### Why
This is the combinatorial content of **Mirsky's theorem**, which partitions a finite-dimensional order into `krullDim + 1` antichains (and is the easy dual of Dilworth's theorem). Neither Mirsky nor Dilworth currently appears in Mathlib — both are on the tracked list in `docs/1000.yaml` without a `decl`, and searching for `Mirsky` and `Dilworth` returns nothing.
Rather than introduce the partition machinery up front, this contributes the underlying fact, which is what any route to Mirsky needs and is independently useful for reasoning about graded and finite-dimensional orders.
### Design
Stated with `(· < ·)` rather than `(· ≤ ·)` so that it lives in the existing `[Preorder α]` section and needs no antisymmetry; in a partial order the two coincide for distinct elements. The hypothesis is `n ≠ ⊤` rather than a finiteness typeclass, which keeps it usable without extra assumptions — `height_strictMono` needs exactly that much.
### Proof
Three lines on `height_strictMono`, immediately above it in the same file.
### Verification
Compiles against `master` with no errors or warnings. `#print axioms` reports only `[propext, Classical.choice, Quot.sound]`. No new imports or definitions — `+11 -0` in one file.
### Disclosure
Written with AI assistance (Claude Opus 5) and checked against the Lean kernel; I have read the statement and proof before submitting. Happy to rename, or to restate as `IsAntichain (· ≤ ·)` in a `PartialOrder` section if that is preferred.
|
t-order
new-contributor
|
11/0 |
Mathlib/Order/KrullDimension.lean |
1 |
5 |
['github-actions', 'theebayuser'] |
nobody |
18-72682 18 days ago |
64-58537 64 days ago |
64-58530 64 days |
0 |
| 44297 |
langston-barrett author:langston-barrett |
feat(Data/FinEnum): `Std.PRange.LawfulUpwardEnumerable` instance |
---
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at the bottom of the commit message (before the `---`, and also before
any "Co-authored-by" lines) using the following format:
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- Vector.* -> List.Vector.*
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- Nat.bit1_add_bit1
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I'm not sure how Mathlib feels about interfacing with std constructs, but I was looking for something along the lines of `succMany?` and found `Std.PRange.LawfulUpwardEnumerable`, so I figured I'd implement it and see what the appetite is. Even if we don't decide to use this particular typeclass, the underlying functionality still seems useful.
This is my first ever Lean development, so I would greatly appreciate any tips and feedback on the style!
I wrote all of this by hand, though I asked some questions about Lean to GPT 5.6 Luna along the way.
A `LinearlyUpwardEnumerable` instance would be a good follow-up. |
t-data
new-contributor
|
112/0 |
Mathlib/Data/FinEnum.lean |
1 |
3 |
['github-actions', 'langston-barrett'] |
nobody |
17-20427 17 days ago |
17-29720 17 days ago |
17-37471 17 days |
0 |
| 42895 |
cameronfreer author:cameronfreer |
feat(SetTheory/Ordinal): add lift_sSup and lift_iSup |
Add `InitialSeg.map_sSup` and `InitialSeg.map_iSup` for conditionally complete linear orders with bottom. Specializing these to `Ordinal.liftInitialSeg` gives `Ordinal.lift_sSup`, `Ordinal.lift_iSup`, `Ordinal.lift_iSup_le`, and `Ordinal.lift_iSup_le_iff`.
The `sSup` theorem handles the empty set using preservation of bottom and the nonempty case using normality. The `iSup` theorem is derived from it. Both use an explicit boundedness hypothesis; in particular, `lift_iSup` assumes `BddAbove (Set.range f)` rather than requiring the index type to be small.
🤖 This PR was developed with assistance from Claude and GPT models, using [lean4-skills](https://github.com/cameronfreer/lean4-skills) and [lean-lsp-mcp](https://github.com/oOo0oOo/lean-lsp-mcp).
|
t-set-theory
new-contributor
LLM-generated
|
40/0 |
Mathlib/Order/IsNormal.lean,Mathlib/SetTheory/Ordinal/Family.lean |
2 |
11 |
['cameronfreer', 'github-actions', 'plp127', 'vihdzp'] |
nobody |
17-5198 17 days ago |
59-49669 59 days ago |
59-50616 59 days |
0 |
| 43852 |
ZRTMRH author:ZRTMRH |
feat(Combinatorics/Quiver/Schreier): add Schreier Cayley basics |
Defined Cayley graph as a coset Schreier graph. Proved connectivity and vertex-transitivity on Cayley graphs, as promised in #38310.
Follow-up to #38310, this is the 3rd split pr from #35467.
This PR was written with AI assistance (Claude). The code has been reviewed by the author.
P.S. cayley_subsingleton_weaklyConnectedComponent's proof is generic and I can extract it to Quiver/ConnectedComponent.lean as a weak-connectivity lemma, if it is wanted.
---
<!-- Your PR title will become the first line of the commit message.
In this box, the text above the `---` (if not empty) will be appended
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For details on the "pull request lifecycle" in mathlib, please see:
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In particular, note that most reviewers will only notice your PR
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Please ask for help on https://leanprover.zulipchat.com if needed.
When merging, all the commits will be squashed into a single commit
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Co-authors in the squash commit are gathered from two sources:
First, all authors of commits to this PR branch are included. Thus,
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each co-author among the commits in the pull request. If necessary, you
may create empty commits to indicate co-authorship, using commands like so:
git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
Second, co-authors can also be listed in lines at the very bottom of
the commit message (that is, directly before the `---`) using the following format:
Co-authored-by: Author Name <author@email.com>
If you are moving or deleting declarations, please include these lines
at the bottom of the commit message (before the `---`, and also before
any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
- ...
Any other comments you want to keep out of the PR commit should go
below the `---`, and placed outside this HTML comment, or else they
will be invisible to reviewers.
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using the following format:
- [ ] depends on: #abc [optional extra text]
- [ ] depends on: #xyz [optional extra text]
-->
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-combinatorics
large-import
LLM-generated
|
278/7 |
Mathlib/Combinatorics/Quiver/Schreier.lean |
1 |
10 |
['SnirBroshi', 'ZRTMRH', 'github-actions', 'mathlib-merge-conflicts', 'vlad902'] |
nobody |
16-42539 16 days ago |
18-45440 18 days ago |
31-8248 31 days |
0 |
| 42815 |
korbonits author:korbonits |
feat(Analysis/Calculus/VectorField): the Lie bracket acts as a derivation on functions |
Add `VectorField.lieBracket_apply_fun`: for a function `f` with derivative `f'` and vector fields `V`, `W`,
D(f' W) V - D(f' V) W = f' [V, W]
i.e. the familiar `[V, W] f = V (W f) - W (V f)`. The two second-derivative terms cancel by symmetry of the second derivative, leaving exactly the bracket.
Placed beside the existing `lieBracket_smul_*` product rules. Needs no new import: `FDeriv.Symmetric` is already imported for `second_derivative_symmetric`, which supplies the symmetry and is the source of the `IsRCLikeNormedField` hypothesis.
---
AI disclosure
- level: Level 5 / Level 6 in [the link shared](https://www.visidata.org/blog/2026/ai/#self-assessed-ai-level-for-contributions) I feel confident about the math but I am still learning Lean itself
- code: most of the Lean in this PR was drafted by Claude Code (statements, proofs, docstrings).
- direction and review: I chose the contribution, made the decisions, reviewed every line, and wrote all GitHub/Zulip comments. |
t-analysis
new-contributor
LLM-generated
t-differential-geometry
|
17/0 |
Mathlib/Analysis/Calculus/VectorField.lean |
1 |
11 |
['github-actions', 'korbonits', 'themathqueen'] |
nobody |
14-50110 14 days ago |
21-38378 21 days ago |
61-69483 61 days |
0 |
| 44437 |
FawadHa1der author:FawadHa1der |
perf(Analysis/Normed/Lp/SmoothApprox): manifold-free proof of smooth approximation in Lp |
Authored with AI help. Created after @mcdoll feedback on [leanprover-community/mathlib4#42451](https://github.com/leanprover-community/mathlib4/pull/42451)
This is an alternate solution. This removes the manifold chain from the longest pole and even if the poisson summation is approved using denseRange_toLpCLM. We would still be saving roughly 5% in build time. There is only one new lemma but no change to existing lemmas/statements.
|
t-analysis
new-contributor
|
82/36 |
Mathlib/Analysis/Normed/Lp/SmoothApprox.lean |
1 |
3 |
['FawadHa1der', 'github-actions'] |
nobody |
14-31932 14 days ago |
14-32683 14 days ago |
14-32676 14 days |
0 |
| 44379 |
JokerXin2025 author:JokerXin2025 |
fix(tactic): skip implementation-detail declarations in `specialize_all` |
This commit fixes a bug in the `specialize_all` tactic that causes incorrect behavior in `specialize_all; assumption`.
In the original implementation of `specialize_all`, the statement `for h in ← getLCtx do` iterates over the entire local context without filtering out auxiliary declarations, particularly the theorem currently being proved. This allows the subsequent `assumption` tactic to directly use the local hypothesis produced by specializing that declaration, recursively “proving” the current theorem. This issue makes `tauto_set` unusable in many cases where it successfully executes `specialize_all` internally.
Here are some examples of the bug in `specialize_all` (before the fix):
```lean
import Mathlib.Tactic.TautoSet
/-- error: fail to show termination for
_example
with errors
failed to infer structural recursion:
Cannot use parameter x:
failed to eliminate recursive application
_example x✝ rfl -/
#guard_msgs (substring := true) in
example (x : ℕ) : {x} ⊆ Set.univ := by tauto_set
/-- error: fail to show termination for
_example -/
#guard_msgs (substring := true) in
example {α : Type} : α → False := by
intro x
specialize_all x
assumption
```
This issue does not cause Lean to accept the invalid proof, because it is rejected by the termination checker.
I fixed this issue by adding
```lean
unless h.isImplementationDetail do
```
after the loop statement above to filter out all implementation-detail hypotheses, including the auxiliary declaration for the current theorem. I also added three regression tests in `MathlibTest/Tactic/TautoSet.lean`. All three compile successfully now, but fail with `error: fail to show termination for ...` before the fix.
GPT-6-Astra was used to help locate the bug and translate the PR description to English.
---
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-->
|
t-meta
new-contributor
maintainer-merge
|
21/2 |
Mathlib/Tactic/TautoSet.lean,MathlibTest/Tactic/TautoSet.lean |
2 |
11 |
['JokerXin2025', 'JovanGerb', 'github-actions', 'grunweg', 'plp127'] |
nobody |
14-23468 14 days ago |
14-64414 14 days ago |
15-14970 15 days |
0 |
| 38223 |
Deicyde author:Deicyde |
feat(Geometry/Manifold): add `MfldCat`, the category of `C^n` manifolds |
Defines `MfldCat 𝕜 n`: the category of `C^n` manifolds over a field `𝕜`, in which the model with corners is allowed to vary between objects. An object bundles a model vector space `E`, a model space `H`, a model with corners `I : ModelWithCorners 𝕜 E H` and a term of `ModelWithCorners.MfldCat I n`--see #41109. This includes manifolds with boundary / corners.
For more discussion see this Zulip thread: [#PR reviews > #38223 The Category of C^n Manifolds](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2338223.20The.20Category.20of.20C.5En.20Manifolds/with/587038032)
Also added: `ContMDiffMap.id_apply`, `.coe_id` and `.coe_comp` which are comparable to `ContinuousMap` API.
### Future work
- ✅ Define a Monoidal structure via product manifolds, analogous to `Manifold.Topology.Category.TopCat.Monoidal` #38560
- ✅ Define the tangent functor: `M ↦ TM`, `F ↦ F.tangentMap` from `MfldCat (n+1) 𝕜` to `MfldCat n 𝕜` #38270
- Functor `FGModuleCat 𝕜 ⥤ MfldCat 𝕜 n` sending a finite-dimensional `𝕜`-vector space to the manifold modeled on itself. Left as `TODO`.
- Define `FGModuleCat 𝕜` as an enriched category over `MfldCat n 𝕜`. Then _smooth functors_ can be realized as endofunctors on the enriched category. This is the main motivation for this construction.
---
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- ...
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-->
- [x] depends on: #41109 [The category of `C^n` manifolds on a fixed model]
[](https://gitpod.io/from-referrer/)
|
t-differential-geometry
new-contributor
t-category-theory
|
210/0 |
Mathlib.lean,Mathlib/Geometry/Manifold/Category/MfldCat/Basic.lean,Mathlib/Geometry/Manifold/ContMDiffMap.lean |
3 |
63 |
['Deicyde', 'chrisflav', 'dagurtomas', 'github-actions', 'idontgetoutmuch', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'peabrainiac'] |
ocfnash assignee:ocfnash |
14-6103 14 days ago |
36-53597 36 days ago |
96-7429 96 days |
2 |
| 42831 |
ray-shang author:ray-shang |
feat(CategoryTheory/Preadditive): category ring of preadditive category |
Given a preadditive category `C`, its category ring `CategoryRing C` is the non-unital ring
whose underlying additive group is the direct sum of all of its morphism groups `X ⟶ Y`, and
whose multiplication is induced by composition: the product of a morphism `f : X ⟶ Y` with a
morphism `g : Z ⟶ W` is `f ≫ g` when `Y = Z`, and `0` otherwise. When `C` is `R`-linear this ring
is a (non-unital) `R`-algebra, and when `C` has finitely many objects it is unital, with
unit `∑ X, 𝟙 X`.
This file formalizes `CategoryRing C` and its structure and universal property
when `C` is preadditive, `R`-linear, finite type, and both finite type and `R`-linear. For example,
when `C` is merely preadditive, the universal property of `CategoryRing C` is: non-unital ring
homomorphisms out of `CategoryRing C` correspond to `LiftData`, the data of a
compatible family of additive maps `(X ⟶ Y) →+ A` for a `NonUnitalNonAssocSemiring A`.
AI Usage: Gemini 3.1 Pro Extended Thinking is in use to generate proof terms for the custom induction principle to unwrap the nested direct sums of the category algebra. Human oversight and work determines the most efficient proof term.
---
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git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
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the commit message (that is, directly before the `---`) using the following format:
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Moves:
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- Nat.bit1_add_bit1
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-->
[](https://gitpod.io/from-referrer/)
|
t-category-theory
new-contributor
|
706/0 |
Mathlib.lean,Mathlib/CategoryTheory/Preadditive/CategoryRing.lean |
2 |
11 |
['b-reinke', 'github-actions', 'joelriou', 'ray-shang', 'robin-carlier'] |
robin-carlier assignee:robin-carlier |
13-6100 13 days ago |
28-30480 28 days ago |
28-63502 28 days |
0 |
| 43745 |
theebayuser author:theebayuser |
feat(Geometry/Euclidean): add Euler's quadrilateral theorem |
Adds Euler's quadrilateral theorem to Mathlib/Geometry/Euclidean/, and records it in docs/1000.yaml (Q18630480). It states: for any four points, the sum of the squares of the four sides of the quadrilateral a b c d equals the sum of the squares of the two diagonals, plus four times the square of the distance between the midpoints of the diagonals.
This PR was written with AI assistance (Claude Code).
|
t-euclidean-geometry
new-contributor
LLM-generated
maintainer-merge
|
84/0 |
Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Geometry/Euclidean/EulerQuadrilateral.lean,docs/1000.yaml |
4 |
17 |
['github-actions', 'jsm28', 'theebayuser', 'wwylele'] |
nobody |
13-5200 13 days ago |
34-81085 34 days ago |
34-81078 34 days |
0 |
| 40973 |
certik author:certik |
feat: multiplicative automatic continuity on ℝ |
This PR adds the multiplicative companion of the existing additive automatic-continuity theorem `AddMonoidHom.continuous_of_measurable`. See the git commit descriptions for all the details.
Depends on https://github.com/leanprover-community/mathlib4/pull/40976.
AI usage disclosure: I used Claude Opus 4.8 to create the theorems and proofs in my own Lean project, then extracted them into this PR since I think they are general purpose and would be useful for other people. I iterated on the proofs until they are as simple as I could get them. I am new to Lean, so if something should be reworked, please let me know. Lean is amazing, I was able to use it to prove various theorems and check my derivations. This is my little contribution back to the project. |
t-measure-probability
LLM-generated
new-contributor
|
159/0 |
Mathlib.lean,Mathlib/MeasureTheory/Measure/Haar/AutomaticContinuity.lean |
2 |
10 |
['certik', 'github-actions', 'mathlib-merge-conflicts', 'wwylele'] |
nobody |
13-5199 13 days ago |
111-70028 111 days ago |
114-7318 114 days |
0 |
| 41729 |
vaca22 author:vaca22 |
feat(RingTheory/DedekindDomain): add divisor group core |
Add the divisor group of a Dedekind domain as a formal-sum model, together with the additive equivalence to the multiplicative group of nonzero fractional ideals.
**Relation to what Mathlib already has.** As pointed out on Zulip, Mathlib already knows that fractional ideals factor: `FractionalIdeal.count` gives the exponent of a height-one prime, and `ClassGroup` is built from fractional ideals directly. This PR does not re-prove any of that — it reuses `count` and `finite_factors` verbatim. What it adds is the *additive* packaging:
* `IsDedekindDomain.Divisor R := HeightOneSpectrum R →₀ ℤ`, so a divisor is a finitely supported integer-valued function and one can write `D₁ + D₂`, `-D`, `D v`, and use the whole `Finsupp` API (`support`, `sum`, induction on the support);
* `FractionalIdeal.divisorEquiv`, an `AddEquiv` from `(FractionalIdeal R⁰ K)ˣ` to `Divisor R`, turning ideal multiplication into divisor addition.
The multiplicative view is the right one for the class group; the additive one is what divisor-theoretic arguments are written in, where one constantly forms `D - D'`, compares coefficients prime by prime, and does induction over `D.support`. Having both, related by a single `AddEquiv`, means neither side has to be re-derived.
**Downstream use.** This is the bottom layer of a formalization of Riemann–Roch for algebraic function fields (announced in `#AI authored projects > Riemann–Roch for function fields`): `L(D)`, `deg D`, and the statement `ℓ(D) = deg D + 1 - g + ℓ(W - D)` are all phrased in terms of additive divisors, and the degree map is defined by summing coefficients over `D.support`.
Happy to reshape the API — in particular whether `Divisor` should be an `abbrev` or a structure, and whether this belongs next to `Factorization` rather than in its own file.
AI usage: LLM-generated, disclosed per the AI policy.
|
t-ring-theory
new-contributor
LLM-generated
|
100/0 |
Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Divisor.lean |
2 |
4 |
['github-actions', 'grunweg', 'vaca22'] |
mattrobball assignee:mattrobball |
12-6101 12 days ago |
92-16069 92 days ago |
94-13265 94 days |
0 |
| 42630 |
will1491 author:will1491 |
feat(Analysis/Complex): define Wirtinger derivatives |
Define the Wirtinger derivatives `Complex.wirtingerDeriv` and `Complex.wirtingerDerivBar` from `fderiv ℝ`, and prove: the Cauchy-Riemann characterization of complex differentiability (pointwise and on open sets), agreement of `wirtingerDeriv` with `deriv` for holomorphic functions, additivity, Leibniz product rules, conjugation identities, both Wirtinger chain rules, and the Wirtinger decomposition of a real-linear map `ℂ →L[ℝ] ℂ`.
Extracted from https://github.com/will1491/RiemannDynamics, where it underlies the Beltrami-equation and Cauchy/Beurling-transform theory used in the proof of the measurable Riemann mapping theorem.
---
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at the bottom of the commit message (before the `---`, and also before
any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
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below the `---`, and placed outside this HTML comment, or else they
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- [ ] depends on: #xyz [optional extra text]
-->
[](https://gitpod.io/from-referrer/)
|
t-analysis
new-contributor
|
253/0 |
Mathlib.lean,Mathlib/Analysis/Complex/Wirtinger.lean |
2 |
3 |
['github-actions', 'mathlib-merge-conflicts'] |
urkud assignee:urkud |
12-6096 12 days ago |
36-20186 36 days ago |
66-82220 66 days |
0 |
| 40967 |
Formalistic03 author:Formalistic03 |
feat(Combinatorics/SimpleGraph/Paths): some lemmas about inducing walks |
Could also be done via `SimpleGraph.Walk.map_induce`, but I thought that doing it directly is not much worse.
---
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Co-authors in the squash commit are gathered from two sources:
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git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
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at the bottom of the commit message (before the `---`, and also before
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Moves:
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- Nat.bit1_add_bit1
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- [ ] depends on: #xyz [optional extra text]
-->
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-combinatorics
maintainer-merge
|
59/0 |
Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Maps.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/Sym/Sym2.lean |
4 |
34 |
['Formalistic03', 'SnirBroshi', 'github-actions'] |
b-mehta assignee:b-mehta |
11-15355 11 days ago |
12-24572 12 days ago |
105-38292 105 days |
0 |
| 43104 |
elazarg author:elazarg |
feat(InformationTheory/KullbackLeibler): finite Kullback-Leibler divergence |
Add finite-sum formulas for `InformationTheory.klDiv` on finite measurable spaces, including equal-mass and probability-measure specializations and formulas for sums of weighted Dirac measures. Provide both `ℝ≥0∞`-valued and `toReal` versions.
Supporting API includes a formula for the Radon–Nikodym derivative at points of nonzero reference-measure mass, a finite-sum formula for the integral of the log-likelihood ratio, and singleton-mass and absolute-continuity lemmas for sums of weighted Dirac measures.
---
Continuing #42584, another part of https://github.com/elazarg/kraft.
Following review, this uses the existing `klDiv` instead of introducing `klDivFin`. The `toReal` formulas connect it to real-valued sums in downstream code.
For measures of unequal mass, the formulas retain the correction term `ν.real univ - μ.real univ`.
The KL formulas are in `KullbackLeibler/Basic.lean`; the supporting lemmas are in the corresponding measure-theory modules.
[](https://gitpod.io/from-referrer/)
|
t-measure-probability
new-contributor
LLM-generated
|
100/1 |
Mathlib/InformationTheory/KullbackLeibler/Basic.lean,Mathlib/MeasureTheory/Measure/Decomposition/RadonNikodym.lean,Mathlib/MeasureTheory/Measure/Dirac/Basic.lean,Mathlib/MeasureTheory/Measure/LogLikelihoodRatio.lean |
4 |
9 |
['EtienneC30', 'elazarg', 'github-actions', 'vlad902'] |
RemyDegenne assignee:RemyDegenne |
11-6099 11 days ago |
33-25485 33 days ago |
42-7156 42 days |
0 |
| 44440 |
vincentqb author:vincentqb |
feat(Computability/TuringMachine): bound the output length of a TM2 run |
This PR bounds the output length of a TM2 run by the input length plus a machine constant times the step count. It deduces `TM2ComputableInPolyTime.length_le`, the polynomial output-length bound used in composition.
It also adds step-count induction and defines `initList` and `haltList` using `Function.update`.
---
Relates to #7172 #33132 #35366
The code, the testing, and this description were prepared with the help of an AI coding assistant (Codex).
|
t-computability
LLM-generated
new-contributor
|
82/7 |
Mathlib/Computability/StateTransition.lean,Mathlib/Computability/TuringMachine/Computable.lean,Mathlib/Computability/TuringMachine/StackTuringMachine.lean |
3 |
3 |
['github-actions', 'vincentqb'] |
nobody |
10-77099 10 days ago |
14-14073 14 days ago |
14-14066 14 days |
1 |
| 44536 |
vincentqb author:vincentqb |
feat(Probability): conditional variance of a Bernoulli random variable |
This PR proves `Var[X; P | m] =ᵐ[P] P[X | m] * P[1 - X | m]` for a random variable with law `Ber(1, 0, p)`.
It replaces the binomial `proof_wanted`, which is false: for `Bin(2, 1/2)` and the trivial σ-algebra, the variance is `1/2` while the proposed product is `0`.
---
Supersedes #44467. Independent of #42999, which proves the remaining binomial variance statement.
The code, the testing, and this description were prepared with the help of an AI coding assistant (Codex).
|
t-measure-probability
LLM-generated
new-contributor
|
15/10 |
Mathlib/Probability/Distributions/TwoValued.lean,Wanted/Probability/Distributions/Binomial.lean |
2 |
3 |
['github-actions', 'vincentqb'] |
nobody |
10-75820 10 days ago |
10-75820 10 days ago |
10-75813 10 days |
0 |
| 44541 |
vincentqb author:vincentqb |
feat(Computability/Partrec): computability of list operations |
This PR adds `Computable.list_foldl`, `list_foldr`, `list_rec`, and `list_map`, with the same statements as their `Primrec` counterparts.
---
The code, the testing, and this description were prepared with the help of an AI coding assistant.
|
LLM-generated
new-contributor
t-computability
|
37/0 |
Mathlib/Computability/Partrec.lean |
1 |
3 |
['github-actions', 'vincentqb'] |
nobody |
10-75785 10 days ago |
10-76042 10 days ago |
10-76035 10 days |
0 |
| 41915 |
theebayuser author:theebayuser |
feat(Data/List): infixes, the enumerator of contiguous factors |
This PR adds `List.infixes`, which is the list of all infixes of a list.
---
AI disclosure: This code was mostly generated by Claude Fable 5 and Opus 4.8 as part of my larger project on combinatorics on words, which I then reviewed and revised to contribute to mathlib.
|
t-data
LLM-generated
new-contributor
|
37/2 |
Mathlib/Data/List/Infix.lean |
1 |
4 |
['github-actions', 'mathlib-merge-conflicts', 'theebayuser'] |
joneugster assignee:joneugster |
10-11879 10 days ago |
39-26972 39 days ago |
89-81267 89 days |
0 |
| 43539 |
abhijitaj1997 author:abhijitaj1997 |
feat(CategoryTheory/Monoidal/Cartesian/Endomorphism): add ring and semiring structures |
Given two monoidal object in a nice enough category, this show that the monoidal morphisms between then forms an additive group. This additive group is part of a larger semiring structure.
---
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[](https://gitpod.io/from-referrer/)
|
new-contributor
t-category-theory
|
165/0 |
Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Endomorphism.lean |
2 |
36 |
['Multramate', 'abhijitaj1997', 'alreadydone', 'github-actions', 'joelriou', 'robin-carlier'] |
joelriou assignee:joelriou |
10-6098 10 days ago |
35-39638 35 days ago |
37-85526 37 days |
0 |
| 44269 |
ROTARTSI82 author:ROTARTSI82 |
feat(Dynamics): periodic orbits must jump up and down |
If x is a periodic point and not a fixed point, there exists some b in its periodic orbit such that b < f b, and some b' such that f b' < b'.
---
This change was motivated by the following proof, a special case of Sharkovskii's theorem:
```lean
theorem exists_isFixedPt_of_continuous_of_mem_periodicPts' {α : Type*}
[ConditionallyCompleteLinearOrder α] [TopologicalSpace α] [OrderTopology α] [DenselyOrdered α]
{f : α → α} {x₀ : α} (hx₀ : x₀ ∈ periodicPts f)
(hf : Continuous f) :
∃(c : α), IsFixedPt f c := by
by_cases hfixed : IsFixedPt f x₀
· exact ⟨x₀, hfixed⟩
obtain ⟨a, _, ha⟩ := exists_lt_map_of_mem_periodicPts hx₀ hfixed
obtain ⟨b, _, hb⟩ := exists_map_lt_of_mem_periodicPts hx₀ hfixed
obtain ⟨c, _, hc⟩ := exists_mem_uIcc_isFixedPt hf.continuousOn ha.le hb.le
exact ⟨c, hc⟩
```
Would this theorem itself or something similar be wanted in mathlib?
<!-- Your PR title will become the first line of the commit message.
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below the `---`, and placed outside this HTML comment, or else they
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|
new-contributor
t-dynamics
|
39/0 |
Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Order/Monotone/Basic.lean |
2 |
3 |
['ROTARTSI82', 'github-actions'] |
urkud assignee:urkud |
10-6095 10 days ago |
18-77842 18 days ago |
18-77835 18 days |
0 |
| 44392 |
yhx-12243 author:yhx-12243 |
fix(Algebra/Polynomial/Roots): fix tendstoCofinite with normal generic universe |
Remove the extraneous accidentally {R : Type} [CommRing R] [IsDomain R] in the signature of `Polynomial.tendstoCofinite_of_natDegree_ne_zero`, make it generic. |
t-algebra
new-contributor
label:t-algebra$ |
2/2 |
Mathlib/Algebra/Polynomial/Roots.lean |
1 |
3 |
['github-actions', 'plp127'] |
nobody |
9-34905 9 days ago |
15-41047 15 days ago |
15-41040 15 days |
0 |
| 44613 |
keithadler author:keithadler |
feat(RepresentationTheory): irreducible representations are bounded by conjugacy classes |
For a finite group `G` and an algebraically closed field `k` in which `|G|` is invertible, `Representation.char_orthonormal` gives orthogonality of irreducible characters. This PR adds the consequence that is used in practice:
* `Representation.classFunction ρ : ConjClasses G → k`, the character as a class function;
* `Representation.linearIndependent_classFunction`: the class functions of a family of pairwise non-isomorphic irreducible representations are linearly independent;
* `Representation.card_le_card_conjClasses`: such a family has at most `Nat.card (ConjClasses G)` members.
This is the upper-bound half of "the number of irreducible representations equals the number of conjugacy classes" (the other half, that characters span the class functions, is not yet in Mathlib). The bound is exactly what is needed to show that an explicit list of `Nat.card (ConjClasses G)` pairwise non-isomorphic irreducibles is complete; e.g. with the companion PR on conjugacy classes of `Perm α`, that the Specht modules exhaust the irreducible representations of `S_n` (used downstream in https://github.com/keithadler/saxl-lean).
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---
|
t-algebra
new-contributor
LLM-generated
label:t-algebra$ |
118/0 |
Mathlib.lean,Mathlib/RepresentationTheory/CharacterCount.lean |
2 |
2 |
['github-actions'] |
nobody |
9-14192 9 days ago |
9-24516 9 days ago |
9-24509 9 days |
0 |
| 44618 |
barni120400 author:barni120400 |
feat(RingTheory/MvPolynomial/Homogeneous): powers of linear forms span the homogeneous polynomials |
Prove that the `n`-th powers of linear forms span the homogeneous polynomials of degree `n` (`MvPolynomial.homogeneousSubmodule_eq_span_pow`). Along the way, add the identity `Finset.sum_powerset_neg_one_pow_card_mul_sum_sdiff_pow_card` used in the proof.
---
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
t-data
new-contributor
LLM-generated
|
64/0 |
Mathlib/Data/Nat/Choose/Sum.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean |
2 |
2 |
['github-actions'] |
nobody |
9-14128 9 days ago |
9-17259 9 days ago |
9-19467 9 days |
0 |
| 42357 |
SynBurz author:SynBurz |
feat: the Krull dimension of the product of finitely many rings is equal to the maximum of Krull dimensions of the factors |
Add `ringKrullDim_pi_eq_iSup_ringKrullDim`. Also add useful defs: `LTSeries.sigmaEquiv`, `PrimeSpectrum.sigmaToPiOrderIso`, and lemmas `PrimeSpectrum.sigmaToPiOrderIso_apply`, Pi.not_comap_evalRingHom_le_comap_of_neq`, `LTSeries.sigma_fst_eq_fst`.
---
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- [ ] depends on: #xyz [optional extra text]
-->
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-algebra
label:t-algebra$ |
93/0 |
Mathlib/Order/RelSeries.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean |
3 |
6 |
['SynBurz', 'github-actions', 'mathlib-merge-conflicts', 'wwylele'] |
nobody |
9-13872 9 days ago |
9-15737 9 days ago |
38-26545 38 days |
0 |
| 41904 |
rshlyakh author:rshlyakh |
feat(RingTheory/KrullDimension): add Krull dimension preservation under injective integral extensions |
This proves that an injective integral homomorphism of commutative rings
preserves Krull dimension, based on the `Algebra.HasGoingUp` infrastructure from #40911. It includes:
- `RingHom.IsIntegral.ringKrullDim_eq_of_injective`: injective integral homomorphisms of
commutative rings preserve Krull dimension.
- `RingHom.IsIntegral.ringKrullDim_quotient_ker_eq`: for an integral extension `f : A →+* B`,
the Krull dimension of `B` is equal to the Krull dimension of `A ⧸ RingHom.ker f`.
- [x] depends on: #40911
- [x] depends on: #41058
---
<!-- Your PR title will become the first line of the commit message.
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-->
[](https://gitpod.io/from-referrer/)
|
t-ring-theory
new-contributor
|
77/12 |
Mathlib.lean,Mathlib/RingTheory/Ideal/HasGoingUp.lean,Mathlib/RingTheory/KrullDimension/Integral.lean |
3 |
14 |
['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'rshlyakh', 'vlad902'] |
mariainesdff assignee:mariainesdff |
9-6098 9 days ago |
63-13008 63 days ago |
89-72894 89 days |
1 |
| 42786 |
rshlyakh author:rshlyakh |
feat(Data/Finsupp/NatCard): count finsupps of bounded degree |
Adds the formula that the number of finitely-supported functions `α →₀ ℕ` with degree less than or equal to `n` is equal to `Nat.choose (Nat.card α + n) n`. The proof is by establishing an equivalence `Sym (Option α) n ≃ {f : α →₀ ℕ // f.degree ≤ n}` and using the stars-and-bars formula `Sym.equivNatSum.`
---
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each co-author among the commits in the pull request. If necessary, you
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git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
Second, co-authors can also be listed in lines at the very bottom of
the commit message (that is, directly before the `---`) using the following format:
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- Nat.bit1_add_bit1
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[](https://gitpod.io/from-referrer/)
|
t-data
new-contributor
|
56/0 |
Mathlib.lean,Mathlib/Data/Finsupp/NatCard.lean |
2 |
2 |
['github-actions'] |
TwoFX assignee:TwoFX |
9-6094 9 days ago |
63-1963 63 days ago |
63-4590 63 days |
0 |
| 44020 |
bally65 author:bally65 |
feat(NumberTheory/Fibonacci): congruences for Fibonacci numbers modulo a prime |
For a prime p ≠ 2: F_p ≡ (5/p) (mod p), hence p ∣ F_{p-1} when (5/p) = 1 and p ∣ F_{p+1} when (5/p) = -1, plus the p % 5 forms via quadratic reciprocity. Proof in (ZMod p)[X]/(X^2 - X - 1) via Frobenius; no case split on (5/p).
AI disclosure: I used Claude and ChatGPT to discuss ideas, to adjust and optimize the approach, and to explore whether there was something worth taking on. They also proposed many of the problems, lines of thought, and decisions about direction. Almost all of the Lean code, including the changes made in response to review, was written by Claude Code.
AI 使用聲明：我使用 Claude 和 ChatGPT 討論構思、調整與優化，也討論有沒有值得挑戰的方向。它們也提出了許多題目、思路和決策方向。Lean 程式碼與依審稿意見所做的修改，幾乎全部由 Claude Code 撰寫。
Note: the English disclosure is a translation of my Chinese text, assisted by Claude. |
t-number-theory
new-contributor
LLM-generated
|
188/0 |
Mathlib.lean,Mathlib/NumberTheory/Fibonacci.lean |
2 |
11 |
['Julian-Kuelshammer', 'bally65', 'github-actions'] |
nobody |
8-40047 8 days ago |
8-43163 8 days ago |
8-45550 8 days |
0 |
| 44019 |
bally65 author:bally65 |
feat(Computability/Primrec): primality is primitive recursive |
Primrec.nat_prime : PrimrecPred Nat.Prime, via Nat.prime_def_lt' and the bounded quantifier PrimrecRel.forall_lt. Mathlib had no computability statement about Nat.Prime.
AI disclosure: I used Claude and ChatGPT to discuss ideas, to adjust and optimize the approach, and to explore whether there was something worth taking on. They also proposed many of the problems, lines of thought, and decisions about direction. Almost all of the Lean code was written by Claude Code. I applied the reviewer's suggested changes myself.
AI 使用聲明：我使用 Claude 和 ChatGPT 討論構思、調整與優化，也討論有沒有值得挑戰的方向。它們也提出了許多題目、思路和決策方向。Lean 程式碼幾乎全部由 Claude Code 撰寫。審稿人提供的修改建議由我自己套用。
Note: the English disclosure is a translation of my Chinese text, assisted by Claude. |
t-computability
new-contributor
LLM-generated
|
44/0 |
Mathlib.lean,Mathlib/Computability/Primrec/Prime.lean |
2 |
6 |
['bally65', 'github-actions', 'pepamontero'] |
nobody |
8-39813 8 days ago |
24-46564 24 days ago |
25-81210 25 days |
0 |
| 44535 |
vincentqb author:vincentqb |
feat(RingTheory/SimpleModule): semisimplicity along semilinear maps |
This PR proves that semisimplicity passes to the domain of an injective semilinear map and to the codomain of a surjective one, assuming `RingHomSurjective σ`.
The scalar-map hypothesis corrects the two `proof_wanted` statements. For example, the injective map `ℤ → ℚ` would otherwise imply that `ℤ` is semisimple as a `ℤ`-module.
---
The code, the testing, and this description were prepared with the help of an AI coding assistant.
|
LLM-generated
new-contributor
file-removed
t-ring-theory
|
31/30 |
Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/SimpleModule/Basic.lean,Wanted.lean,Wanted/RingTheory/SimpleModule/Basic.lean |
5 |
9 |
['github-actions', 'tb65536', 'vincentqb'] |
nobody |
8-21886 8 days ago |
8-24539 8 days ago |
9-46023 9 days |
0 |
| 42365 |
hawkrobe author:hawkrobe |
feat(LinearAlgebra/TensorProduct): tensor product of graded modules is graded |
---
Split from #39849, also a first step toward the TODO in `LinearAlgebra/TensorProduct/Graded/Internal.lean` (the tensor product of graded algebras is graded.) I tried to model it after [AddMonoidAlgebra.gradeBy](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/MonoidAlgebra/Grading.html#AddMonoidAlgebra.gradeBy).
[](https://gitpod.io/from-referrer/)
|
t-algebra
new-contributor
label:t-algebra$ |
158/0 |
Mathlib/Data/DFinsupp/Defs.lean,Mathlib/LinearAlgebra/TensorProduct/Decomposition.lean,Mathlib/LinearAlgebra/TensorProduct/Map.lean |
3 |
2 |
['github-actions'] |
ocfnash assignee:ocfnash |
8-6102 8 days ago |
60-25557 60 days ago |
75-19157 75 days |
2 |
| 43183 |
BorisTheBrave author:BorisTheBrave |
fix(Tactic/Linarith): carry `!` and the configuration into `linarith?… |
`linarith?` uses the same configuration as `linarith`,
but previously printed a bare `linarith only [...]` suggestion regardless
of the configuration.
Now all config options except `minimize` are carried into the suggestion.
---
Note: #42588 has a [test](https://github.com/leanprover-community/mathlib4/pull/42588/files#diff-3657543f804f0a57e384f6a9338cc53803a50bebdfb16c1ecd0b514f3fda332fR863) that
unintentionally highlights the problem:
```lean
/--
info: Try this:
[apply] linarith only [hne, hle]
-/
#guard_msgs in
example (a b : ℚ) (hne : a ≠ b) (hle : a ≥ b) (junk : (0:ℚ) < 1) : b < a := by
linarith? +splitNe
```
This suggestion doesn't actually close the proof.
It should suggest `linarith +splitNE only [hne, hle]`.
Should we be using `says` syntax for these tests? I'm unclear on the rule here.
Note: `simp?` has very similar code, `filterSuggestionsAndLocalsFromSimpConfig`, that this PR was modelled after.
AI disclosure:
Claude Code (Fable) first flagged this problem to me, and wrote the first draft. I
made some tweaks to better fit mathlib's style, and wrote all the prose.
[](https://gitpod.io/from-referrer/) |
t-meta
new-contributor
maintainer-merge
|
68/6 |
Mathlib/Tactic/Linarith/Frontend.lean,MathlibTest/Tactic/Linarith/Basic.lean |
2 |
18 |
['BorisTheBrave', 'JovanGerb', 'github-actions', 'joneugster', 'sharky564'] |
joneugster assignee:joneugster |
7-52301 7 days ago |
42-59668 42 days ago |
49-57881 49 days |
0 |
| 42888 |
forxhunter author:forxhunter |
feat(Combinatorics/SimpleGraph): abstract polymer model and the Kotecký–Preiss criterion |
This PR introduces the abstract polymer model of statistical mechanics and the classical
convergence criteria for its cluster expansion, in
`Mathlib/Combinatorics/SimpleGraph/ClusterExpansion.lean`.
The central object is the partition function over independent subsets of a finite family
`Λ` in a graph `G` of incompatibilities, with activities (weights) `w`:
`G.indepPartitionFunction w Λ = ∑ S ⊆ Λ independent in G, ∏ v ∈ S, w v`
As a graph invariant this is the **multivariate independence polynomial** (the
independent-set polynomial of Scott–Sokal) of the subgraph induced on `Λ`, evaluated at `w`;
in statistical mechanics it is the partition function of the abstract polymer model /
hard-core lattice gas. Mathlib has `SimpleGraph.IsIndepSet` (and `IsNIndepSet`, `indepNum`,
…) but — as far as I can find — no independence polynomial in any form; the definition here
is built directly on `IsIndepSet` and is stated for weights in an arbitrary `CommSemiring`.
Main results:
* `SimpleGraph.indepPartitionFunction_deletion`: the deletion identity
`Z Λ = Z (Λ.erase v) + w v * Z (Λ \ N[v])` (over any `CommSemiring`), the induction
backbone of the whole theory.
* `SimpleGraph.DobrushinCriterion` / `SimpleGraph.KoteckyPreissCriterion`: the two classical
sufficient convergence conditions as `Prop`-valued structures, and
`KoteckyPreissCriterion.toDobrushinCriterion`: KP implies Dobrushin via the explicit
damping ansatz `x v = 1 - exp (-(|w v| * exp (a v)))`.
* `SimpleGraph.DobrushinCriterion.indepPartitionFunction_pos`: **nonvanishing** — for signed
real activities satisfying Dobrushin's condition, `0 < Z Λ` for every finite `Λ`, proved
by a strong induction through the deletion identity (the inductive route of
Bissacot–Fernández–Procacci, J. Stat. Phys. 139 (2010); no analyticity, no cluster
combinatorics), together with one-step and telescoped ratio bounds and the two-sided
log-ratio bound `|log (Z Λ) - log (Z Λ')| ≤ ∑ v ∈ Λ \ Λ', -log (1 - x v)`.
* The finite **Kotecký–Preiss theorem** (Comm. Math. Phys. 103 (1986)) with the classical
constants: `KoteckyPreissCriterion.indepPartitionFunction_pos`,
`exp (-∑ a)`- and `exp (∑ a)`-ratio bounds, and
`|log (Z Λ) - log (Z Λ')| ≤ ∑ v ∈ Λ \ Λ', |w v| * exp (a v) ≤ ∑ v ∈ Λ \ Λ', a v`.
* Also new small API: `SimpleGraph.closedNeighborFinset` (`N[v]` as a `Finset`, which
Mathlib currently lacks), `IsIndepSet.not_adj`, `isIndepSet_coe_iff`, and the
unconditional nonnegative-activity estimates (`one_le_indepPartitionFunction`,
`indepPartitionFunction_le_prod`, monotonicity, domination by absolute activities).
Everything is stated for a locally finite incompatibility graph (`[G.LocallyFinite]`) with
finite volumes `Λ : Finset α`; the infinite-volume statements are exactly the monotone
limits of these and are left for a later PR.
**Motivation.** Cluster/polymer expansions are the workhorse of rigorous statistical
mechanics and constructive quantum field theory — they are the standard tool behind
exponential decay of correlations, uniqueness of Gibbs states, and strong-coupling
expansions in lattice gauge theory. To my knowledge no proof assistant has any of this
material (checked against Lean/Mathlib, Coq, and Isabelle AFP, 2026-08-17). This PR is the
self-contained combinatorial/analytic core, extracted from an ongoing Lean formalization
program in mathematical physics (lattice gauge theory, Osterwalder–Seiler strong-coupling
regime), where these bounds are the engine for decay-of-correlations results. Via
Scott–Sokal (J. Stat. Phys. 118 (2005)), the nonvanishing region of this same polynomial is
also the natural home of the Lovász local lemma / Shearer bound, so the object should be
useful to combinatorics independently of the physics.
References: Kotecký–Preiss 1986; Dobrushin 1996; Fernández–Procacci 2007;
Bissacot–Fernández–Procacci 2010; Scott–Sokal 2005 (LLL connection); Fialho
arXiv:2001.00652 (proof source for the follow-up FP engine).
**Planned follow-up PRs** (material exists and is proved; kept out to keep this PR
reviewable):
1. The Fernández–Procacci criterion (replace `exp` in KP by the local partition function on
`N[v]`) and its convergence engine, via Fialho's minorant-invariant induction
(arXiv:2001.00652) — weaker hypothesis, sharper `(1 + μ)` one-step bound.
2. Certified separations of the criterion hierarchy: Dobrushin strictly weaker than KP, FP
strictly weaker than Dobrushin (quantified over *all* ansatzes), and non-necessity of all
three.
3. Exponential decay of truncated correlations in the walk-distance of the incompatibility
graph, with explicit constants.
4. One-point occupancy (density) bounds under KP.
5. Possibly: the uniform-activity specialization as a univariate `Polynomial`, connecting
to the classical independence polynomial `I(G, x)`.
Naming is up for discussion: `indepPartitionFunction` was chosen to serve both the graph
theory and the statistical mechanics readings; I am happy to rename (e.g. to something
closer to "independence polynomial") or to split the `CommSemiring` definition from the
real-activity engine if reviewers prefer.
**AI disclosure**: this PR was substantially generated with Claude Code (Anthropic) — the
proof scripts, the port to current master, and the deduplication against existing Mathlib
material. It is opened as a **draft** while the human author reviews the content; it will be
marked ready only after that review, per the policy that contributors must understand and be
able to defend AI-assisted contributions. The `LLM-generated` label applies and should be
added by a maintainer.
awaiting-author items (will be resolved before marking ready):
- [x] Author review of the full file per the AI-contribution policy.
- [x] The `Authors:` line is finalized as `Tianyu (forxhunter)`.
- [x] Decide on the final name for `indepPartitionFunction` with reviewers.
|
t-combinatorics
new-contributor
LLM-generated
|
723/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/ClusterExpansion.lean |
2 |
3 |
['forxhunter', 'github-actions'] |
nobody |
7-35871 7 days ago |
7-36598 7 days ago |
7-36686 7 days |
0 |
| 44261 |
javgomzar author:javgomzar |
feat(Algebra/Category/Grp): free functor preserves monomorphisms |
Refactored the proof for AddCommGrpCat, so that it also works in GrpCat.
---
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-->
|
t-algebra
new-contributor
label:t-algebra$ |
18/5 |
Mathlib/Algebra/Category/Grp/Adjunctions.lean |
1 |
15 |
['JX-Mo', 'github-actions', 'javgomzar', 'mathlib-merge-conflicts'] |
nobody |
7-34689 7 days ago |
7-35384 7 days ago |
19-7964 19 days |
0 |
| 44681 |
Altabeh author:Altabeh |
feat(Analysis/ODE/Linearization): the derivative of a flow at a fixed… |
Add a new file `Mathlib/Analysis/ODE/Linearization.lean`. Let `ϕ : Flow ℝ E` on a real Banach space
be generated by a vector field `f`, meaning `∀ x t, HasDerivAt (fun s ↦ ϕ s x) (f (ϕ t x)) t`. If
`e` is a fixed point of `ϕ` and `f` has derivative `A` at `e`, then every time-`t` map has derivative
`exp (t • A)` at `e`:
* `Flow.hasFDerivAt_of_isFixedPt`: `HasFDerivAt (ϕ t) (exp (t • A)) e` for every `t : ℝ`.
* `Flow.fderiv_eq_exp_of_isFixedPt`: the `fderiv` form.
* `Flow.eventually_norm_sub_exp_le`: a uniform estimate on compact time intervals. For `0 ≤ T` and
`0 < ε`, eventually for `x` near `e`, `‖ϕ t x - e - exp (t • A) (x - e)‖ ≤ ε * ‖x - e‖` for all
`t ∈ [0, T]`.
Only differentiability of `f` at `e` is needed; nothing is assumed about `f` elsewhere. The estimate
comes from comparing `ϕ t x - e` with `exp (t • A) (x - e)` using Grönwall's inequality. Negative
times are handled by applying the result to `ϕ.reverse`.
---
This PR is independent of the `LipschitzWith.flow` PR. It applies to any `Flow ℝ E` with a
generating vector field, which includes those flows.
**Proof of `eventually_norm_sub_exp_le` is done by a combination of `Claude Opus 5.5` and `GPT-5.6 Sol`. Linting and comments were done by AI.*** |
new-contributor
t-analysis
LLM-generated
|
166/0 |
Mathlib.lean,Mathlib/Analysis/ODE/Linearization.lean |
2 |
3 |
['github-actions', 'grunweg'] |
nobody |
7-21591 7 days ago |
7-22194 7 days ago |
7-24810 7 days |
0 |
| 44680 |
Altabeh author:Altabeh |
feat(Analysis/ODE/LipschitzFlow): the flow of a globally Lipschitz ve… |
Add a new file `Mathlib/Analysis/ODE/LipschitzFlow.lean`. A globally Lipschitz vector field
`v : E → E` on a real Banach space has a unique solution of `γ' = v ∘ γ` through every point, defined
for all time, and these solutions form a continuous flow:
* `LipschitzWith.exists_forall_hasDerivAt`: global existence of solutions.
* `LipschitzWith.dist_le_of_forall_hasDerivAt`: two solutions satisfy
`dist (γ t) (δ t) ≤ dist (γ 0) (δ 0) * exp (K * |t|)`.
* `LipschitzWith.flow : Flow ℝ E`: the flow of `v`.
* `LipschitzWith.hasDerivAt_flow`: the orbits of the flow solve `γ' = v ∘ γ`.
* `LipschitzWith.flow_eq_of_hasDerivAt`: every global solution is an orbit of the flow.
* `LipschitzWith.dist_flow_le`: `dist (flow t x) (flow t y) ≤ dist x y * exp (K * |t|)`.
The field does not need to be bounded. For a bounded field, Picard–Lindelöf (`IsPicardLindelof`)
gives solutions on each interval `(-(n + 1), n + 1)`, and uniqueness glues them into a global
solution. A general field is reduced to this case by multiplying `v` by a Lipschitz cutoff that is
`1` on `closedBall 0 R`. Grönwall's inequality, using `‖v y‖ ≤ ‖v 0‖ + K * ‖y‖`, shows that for
large `R` the solution stays in that ball on the time interval, so the cutoff does not change it.
---
Continuity of the flow jointly in `(t, x)` comes from
`continuousOn_prod_of_continuousOn_lipschitzOnWith'`, using the exponential separation bound on
bounded time intervals.
**The proofs of`exists_forall_hasDerivAt_of_forall_Ioo`, `lipschitzWith_cutoff_smul`, `norm_le_gronwallBound` and part of `dist_le_of_forall_hasDerivAt` used a combo of `GPT-5.6 Sol` and `Claude Opus 5.5`. Linting and comments were done by AI as well.** |
t-analysis
new-contributor
LLM-generated
|
276/0 |
Mathlib.lean,Mathlib/Analysis/ODE/LipschitzFlow.lean |
2 |
3 |
['github-actions', 'grunweg'] |
nobody |
7-21470 7 days ago |
7-22099 7 days ago |
7-24963 7 days |
0 |
| 41426 |
gmcninch-prof author:gmcninch-prof |
feat: add symmetric multilinear maps |
Define `SymmetricMap R M N ι`, the type of symmetric `R`-multilinear maps
from `ι → M` to `N` (i.e. multilinear maps invariant under permutation of
their arguments).
---
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Co-authors in the squash commit are gathered from two sources:
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git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
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the commit message (that is, directly before the `---`) using the following format:
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any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
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- Nat.bit1_add_bit1
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- [ ] depends on: #xyz [optional extra text]
-->
The code is adapted from Kenny Lau's work
[here](https://github.com/kckennylau/EllipticCurve/blob/master/EllipticCurve/ProjectiveSpace/TensorProduct/SymmetricMap.lean)
-- see [`SymmetricMap`](https://github.com/gmcninch-prof/mathlib4/blob/symmetric-power-lift/Mathlib/LinearAlgebra/TensorProduct/SymmetricMap.lean).
This PR previously also contained the universal property / `lift` for
`SymmetricPower` (relating linear maps out of `Sym[R]^n M` to symmetric
multilinear maps), but per reviewer feedback on Zulip that work has been
split into a separate PR that depends on this one.
Zulip discussion [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/SymmetricPower.20universal.20property/near/608532652)
[](https://gitpod.io/from-referrer/)
|
t-algebra
new-contributor
label:t-algebra$ |
397/0 |
Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/SymmetricMap.lean |
2 |
10 |
['github-actions', 'gmcninch-prof', 'jcommelin'] |
kim-em assignee:kim-em |
7-6099 7 days ago |
96-23948 96 days ago |
97-78643 97 days |
1 |
| 41882 |
theebayuser author:theebayuser |
feat(Data/List): decidability of HasPeriod and periods of repeated lists |
Hello, this PR extends `Mathlib/Data/List/PeriodicityLemma.lean` with:
* a `Decidable (List.HasPeriod w p)` instance (it is a prefix test), and
* two directions that relate periods to repetition:
* `hasPeriod_flatten_replicate` — `(replicate n l).flatten` has period `l.length`
* `eq_flatten_replicate_of_hasPeriod` — a word with period `p` and length `r * p` is the `r`-fold repetition of its length-`p` prefix.
This characterizes `r`-th powers of words by a period plus a length constraint, which a future follow-up PR that I plan to work on will use.
AI disclosure: This code was mostly generated by Claude Fable 5 and Opus 4.8 as part of my larger project on combinatorics on words, which I then reviewed and revised to contribute to mathlib.
|
t-data
LLM-generated
new-contributor
|
56/1 |
Mathlib/Data/List/PeriodicityLemma.lean |
1 |
8 |
['SnirBroshi', 'github-actions', 'theebayuser'] |
nobody |
6-76847 6 days ago |
6-77499 6 days ago |
90-69244 90 days |
0 |
| 44679 |
Altabeh author:Altabeh |
feat(LinearAlgebra/FiniteDimensional/Lemmas): dimension counts in exa… |
Add dimension formulas for exact sequences of vector spaces over a division ring `K`:
* `Function.Exact.finrank_range_add_finrank_range`: if `A → B → C` is exact (maps `f`, `g`) and `B`
is finite-dimensional, then `finrank (range f) + finrank (range g) = finrank B`.
* `Function.Exact.linearEquivQuotientRangeProdKer`: if `A → B → C → D → E` is exact (maps
`f, g, h, j`), then `C ≃ₗ[K] (B ⧸ range f) × ker j`.
* `Function.Exact.finrank_eq_finrank_quotient_range_add_finrank_ker`: hence, when `B` and `D` are
finite-dimensional, `finrank C = finrank (B ⧸ range f) + finrank (ker j)`.
---
The splitting is noncomputable, meaning it picks a complement of `ker h` in `C`. These statements are the counting steps used, for example, when comparing Betti numbers along long exact sequences.
**These are basic results that have been written by myself. The only use of AI was to write the comments and test.** |
t-algebra
new-contributor
label:t-algebra$ |
34/0 |
Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean |
1 |
5 |
['Altabeh', 'github-actions', 'grunweg'] |
nobody |
6-72823 6 days ago |
7-21945 7 days ago |
7-24939 7 days |
0 |
| 42314 |
sfingali author:sfingali |
feat(RingTheory): continuous valuations |
### Summary
Defines continuous valuations on topological rings: a valuation `v : A → Γ₀`
whose underlying function is continuous for the order topology on `Γ₀`
(Wedhorn, *Adic Spaces*, arXiv:1910.05934, Def. 7.7 and Rem. 7.8(1), p. 58).
* `ContinuousValuationClass` — the class of continuous valuations: a
`ValuationClass` whose functions are continuous.
* `ContinuousValuation` — a bundled continuous valuation.
* `ContinuousValuation.isOpen_lt` — the primary definition of Wedhorn,
Def. 7.7: `{a | v a < γ}` is open for every `γ`.
This is the second step of an adic/perfectoid pipeline (Huber rings → Huber
pairs → continuous valuations → Spa → perfectoid → tilting); #42312 defines
Huber rings. The subspace `Cont(A) ⊆ Spv(A)` of continuous valuations
(Wedhorn, p. 58) will build on `ValuationSpectrum` once #38009 lands — this
PR provides the element-level notion, which is independent of the spectrum
topology.
### References
* T. Wedhorn, *Adic Spaces*, arXiv:1910.05934, Def. 7.7, Rem. 7.8 (p. 58).
|
t-ring-theory
new-contributor
|
99/0 |
Mathlib.lean,Mathlib/RingTheory/Valuation/ContinuousValuation.lean |
2 |
8 |
['github-actions', 'jjdishere', 'sfingali', 'wwylele'] |
nobody |
6-25868 6 days ago |
77-10784 77 days ago |
77-11323 77 days |
0 |
| 43633 |
Jun2028 author:Jun2028 |
feat(SetTheory/Ordinal): classify exponential principal ordinals |
Complete `` TODO: Prove that the exponential principal ordinals are `0`, `1`, `2`, `ω`, or `ε_ x` `` in [Mathlib/SetTheory/Ordinal/Principal.lean](https://github.com/leanprover-community/mathlib4/compare/master...Jun2028:mathlib4:feat/exponential-principal-classification?expand=1#diff-c700a68af59d576bafeeeac5211181f9ce129bdead444df6c9747344817103bd)
By the way, the original TODO was wrong because `1` is not an exponential principal ordinal (it requires $0^0=1<1$ which is false).
---
<!-- Your PR title will become the first line of the commit message.
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Co-authors in the squash commit are gathered from two sources:
First, all authors of commits to this PR branch are included. Thus,
one way to add co-authors is to include at least one commit authored by
each co-author among the commits in the pull request. If necessary, you
may create empty commits to indicate co-authorship, using commands like so:
git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
Second, co-authors can also be listed in lines at the very bottom of
the commit message (that is, directly before the `---`) using the following format:
Co-authored-by: Author Name <author@email.com>
If you are moving or deleting declarations, please include these lines
at the bottom of the commit message (before the `---`, and also before
any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
- ...
Any other comments you want to keep out of the PR commit should go
below the `---`, and placed outside this HTML comment, or else they
will be invisible to reviewers.
If this PR depends on other PRs, please list them below this comment,
using the following format:
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- [ ] depends on: #xyz [optional extra text]
-->
[](https://gitpod.io/from-referrer/)
|
t-set-theory
new-contributor
maintainer-merge
|
65/6 |
Mathlib/SetTheory/Ordinal/Principal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean |
2 |
36 |
['Jun2028', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp'] |
nobody |
6-22646 6 days ago |
6-24464 6 days ago |
35-41162 35 days |
0 |
| 41781 |
teng10 author:teng10 |
feat(Algebra/Representation): add abstract permutation action in TensorPower |
Hello, I'm a new contributor. I had an introduction here on [zulip](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Introduction.3A.20Schur.20Weyl.20Duality/with/607194314)
This PR is a first step in formalizing Shur Weyl duality, which I got feedback that it would be useful to mathlib. The final statement I had in mind has the form
/--
The centralizer of `{g^{⊗k} | g ∈ End(V)}`equals `Span{W_σ | σ ∈ S_k}`, for all dimensions `d` and tensor powers `k`.
---/
This PR tries to define permutation action on TensorPower; define permutation image space.
An initial version of the definition is more specific to the Euclidean space (for reference I list them below)
```
open scoped TensorProduct
variable {d : ℕ} {k : ℕ}
/-- The `k`-fold tensor power of `ℂ^d`, defined as `⨂[ℂ] (i : Fin k), (Fin d → ℂ)`. -/
abbrev PiTensorPower (d k : ℕ) : Type :=
PiTensorProduct ℂ (fun (_ : Fin k) => (Fin d → ℂ))
/-- The permutation operator `W_σ` on the tensor power `V^{⊗k}`.
Given `σ : Equiv.Perm (Fin k)`, this acts by permuting the tensor factors:
`W_σ (v₁ ⊗ ⋯ ⊗ vₖ) = v_{σ⁻¹(1)} ⊗ ⋯ ⊗ v_{σ⁻¹(k)}`. -/
def permAction (d : ℕ) {k : ℕ} (σ : Equiv.Perm (Fin k)) :
PiTensorPower d k ≃ₗ[ℂ] TensV d k :=
PiTensorProduct.reindex ℂ (fun (_ : Fin k) => (Fin d → ℂ)) σ
/-- The set of permutation operators in `End(V^{⊗k})`. -/
def permImage (d k : ℕ) : Set (Module.End ℂ (TensV d k)) :=
Set.range (fun σ : Equiv.Perm (Fin k) => (permAction d σ).toLinearMap)
```
LLM acknowledgement: I have used aristotle to write these definitions. However, I am very motivated to learn how to write proper code. I have looked more into `PiTensorProduct` and `TensorPower` module and came to the abstract version in the PR. I tried to ask aristotle about how it's defining things and whether it's suitable for mathlib.
And I would very much appreciate your thoughts on how appropriate these definitions are. Thanks for your time!
Yanting
---
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Co-authors in the squash commit are gathered from two sources:
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at the bottom of the commit message (before the `---`, and also before
any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
- ...
Any other comments you want to keep out of the PR commit should go
below the `---`, and placed outside this HTML comment, or else they
will be invisible to reviewers.
If this PR depends on other PRs, please list them below this comment,
using the following format:
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- [ ] depends on: #xyz [optional extra text]
-->
[](https://gitpod.io/from-referrer/)
|
t-algebra
LLM-generated
new-contributor
will-close-soon
label:t-algebra$ |
22/0 |
Mathlib/LinearAlgebra/TensorPower/Basic.lean |
1 |
5 |
['github-actions', 'joelriou', 'teng10'] |
kim-em assignee:kim-em |
6-6098 6 days ago |
93-38510 93 days ago |
93-38519 93 days |
0 |
| 43904 |
t4v1 author:t4v1 |
feat(MeasureTheory/Constructions/HaarToSphere): polar coordinates for lintegral |
`Measure.measurePreserving_homeomorphUnitSphereProd` represents an additive Haar measure on a nontrivial finite-dimensional normed space `E` as the product of the sphere measure `μ.toSphere` and Lebesgue measure on `(0, ∞)` with density `r ^ (dim E - 1)`. The file exposes it only through the radial corollaries `integrable_fun_norm_addHaar`, `integrableOn_fun_norm_addHaar` and `integral_fun_norm_addHaar`, all for integrands of the form `f ‖x‖`.
This PR adds the general `lintegral` form, for an arbitrary measurable `f : E → ℝ≥0∞`:
* `lintegral_addHaar_eq_lintegral_toSphere_lintegral_Ioi`:
`∫⁻ x, f x ∂μ = ∫⁻ ω, ∫⁻ r in Ioi 0, ENNReal.ofReal (r ^ (dim E - 1)) * f (r • ω) ∂μ.toSphere`;
* `setLIntegral_ball_eq_lintegral_toSphere_lintegral_Ioo`: the same for `∫⁻ y in ball c R, f y ∂μ`, with the radial integral over `Ioo 0 R` and the rays emanating from `c`.
Both are needed for Morrey's inequality (follow-up PR), whose two analytic steps integrate non-radial functions in polar coordinates; they are stated here on their own because they are independent of it.
The proofs were developed with the help of an LLM (Claude Code) and then checked and edited by the author, who takes responsibility for every line.
|
t-measure-probability
new-contributor
LLM-generated
|
47/0 |
Mathlib/MeasureTheory/Constructions/HaarToSphere.lean |
1 |
3 |
['github-actions', 't4v1'] |
RemyDegenne assignee:RemyDegenne |
6-6092 6 days ago |
29-17122 29 days ago |
29-17115 29 days |
1 |
| 40963 |
Formalistic03 author:Formalistic03 |
feat(Combinatorics/SimpleGraph/Paths): add lemma about the first dart if dropLast is a path |
If `dropLast` of a walk is a path, a dart of the walk sharing its first vertex with the walk also shares its second vertex.
I thought this was a natural more general form of `IsPath.eq_snd_of_mem_edges`, useful for cycles for example.
---
<!-- Your PR title will become the first line of the commit message.
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[](https://gitpod.io/from-referrer/)
|
t-combinatorics
new-contributor
maintainer-merge
|
46/0 |
Mathlib/Combinatorics/SimpleGraph/Dart.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean |
4 |
38 |
['Formalistic03', 'SnirBroshi', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
6-4185 6 days ago |
6-64738 6 days ago |
95-30583 95 days |
0 |
| 44740 |
user202729 author:user202729 |
chore(Algebra/Ring/CompTypeclasses): fix a typo and reformat slightly |
Change `σ₂₃` to `σ` in the header, this one is clearly a typo.
Do some minor reformatting for the rest of the file, which I think make it nicer.
---
|
t-algebra
new-contributor
label:t-algebra$ |
7/11 |
Mathlib/Algebra/Ring/CompTypeclasses.lean |
1 |
3 |
['github-actions', 'user202729', 'vihdzp'] |
nobody |
5-76779 5 days ago |
5-80448 5 days ago |
5-80441 5 days |
0 |
| 40266 |
WangJiabai author:WangJiabai |
feat(RingTheory/MvPolynomial): define generic determinantal ideals |
This PR adds a foundational API for determinantal ideals of the generic matrix.
It defines `Matrix.MinorIndex`, the corresponding minors of the existing generic
matrix `Matrix.mvPolynomialX`, the finite set of all `t × t` generic minors, and
the ideal generated by these minors in `MvPolynomial (Fin m × Fin n) R`.
It also proves basic membership, evaluation, coefficient-map/base-change, and
finite-generation lemmas.
This PR intentionally does not include the Sturmfels/KRS/straightening/Groebner
part of the development.
---
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Additional context:
This is extracted and refactored from a standalone project on determinantal
ideals and the Gröbner-basis theorem for generic determinantal ideals:
https://github.com/WangJiabai/Determinantal-Ideals-Formalization
The current PR is intentionally limited to the small foundational API for
generic minors and generic determinantal ideals.
AI use:
ChatGPT was used for planning/refactoring discussion, and Codex was used to
draft some proof scripts. I reviewed the statements and proofs and am
responsible for the submitted code.
[](https://gitpod.io/from-referrer/)
|
t-ring-theory
new-contributor
LLM-generated
|
178/0 |
Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/RingTheory/MvPolynomial/DeterminantalIdeal.lean |
3 |
26 |
['WangJiabai', 'github-actions', 'jjdishere', 'tb65536'] |
jjdishere assignee:jjdishere |
5-64830 5 days ago |
5-66233 5 days ago |
132-50963 132 days |
0 |
| 44704 |
keithadler author:keithadler |
fix(Algebra/Category/MonCat): state the `CommMonCat` limit instances for `CommMonCat` |
`CommMonCat.forget_createsLimits*` (and the additive versions) were stated for `forget MonCat`, copied from the `MonCat` section, so `CommMonCat` had no such instances. This states them for `forget CommMonCat`, which needs `[UnivLE.{v, u}]` as for `forget_preservesLimitsOfSize`.
---
For reviewers: the `UnivLE` assumption is there because the `CommMonCat` `CreatesLimit` instance assumes the limit is `Small`; dropping it would mean reproving `forget₂CreatesLimit` without that assumption, which this PR does not attempt. #41551 edits the `noncomputable` keyword on the same lines, so whichever merges second needs a small rebase.
Found with [lean-linter](https://github.com/keithadler/lean-linter). Prepared with AI assistance (Claude); I checked the change and the build.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
t-algebra
LLM-generated
new-contributor
maintainer-merge
label:t-algebra$ |
5/5 |
Mathlib/Algebra/Category/MonCat/Limits.lean |
1 |
6 |
['github-actions', 'grunweg', 'keithadler'] |
nobody |
5-54515 5 days ago |
6-25481 6 days ago |
6-25474 6 days |
0 |
| 44762 |
Julian-Kuelshammer author:Julian-Kuelshammer |
feat(Combinatorics/Enumerative/Catalan/BracketingFunction): adds Huang-Tamari's bracketing functions |
This PR defines bracketing functions, an elementary description of the Tamari lattice. This PR is intentially kept short and just adds the definition and a bit of basic API. There are potential follow-ups proving that these are counted by the Catalan numbers and giving the lattice instance, for a preview see https://github.com/Julian-Kuelshammer/ExtensionClosedSubcategoriesOfAn/blob/main/ExtensionClosedSubcategoriesOfAn/BracketingFunctions.lean
A first version of the file was created with the help of Aristotle and Claude.
---
|
new-contributor
t-combinatorics
LLM-generated
|
102/0 |
Mathlib.lean,Mathlib/Combinatorics/Enumerative/Catalan/BracketingFunction.lean |
2 |
4 |
['Julian-Kuelshammer', 'github-actions'] |
nobody |
5-47264 5 days ago |
5-47832 5 days ago |
5-48219 5 days |
0 |
| 44783 |
ZRTMRH author:ZRTMRH |
feat(Analysis/MeanInequalities): n-ary ℓ^p monotonicity and Lyapunov's inequality |
Add finite-sum versions of the two-term power inequalities in `Analysis/MeanInequalitiesPow.lean`, in `ℝ≥0`, `ℝ` and `ℝ≥0∞`:
* `sum_rpow_le_rpow_sum`: `∑ i ∈ s, f i ^ p ≤ (∑ i ∈ s, f i) ^ p` for `1 ≤ p`
* `rpow_sum_rpow_le`: the `ℓ^p` (quasi)norm `(∑ i ∈ s, f i ^ p) ^ (1 / p)` is antitone in `p > 0`
* `rpow_sum_le_sum_rpow`: `(∑ i ∈ s, f i) ^ p ≤ ∑ i ∈ s, f i ^ p` for `0 < p ≤ 1`
Also add Lyapunov's inequality in `Analysis/MeanInequalities.lean`, `NNReal.lyapunov_inequality` and `Real.lyapunov_inequality_of_nonneg`: the weighted moments `t ↦ ∑ i ∈ s, w i * f i ^ t` are log-convex on `[0, ∞)`.
The code was refined with AI assistance (Claude). The code has been reviewed by the author.
Discussion on zulip: [ℓp norm monotonicity for finite sums](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/.E2.84.93p.20norm.20monotonicity.20for.20finite.20sums)
---
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|
t-analysis
LLM-generated
new-contributor
|
122/0 |
Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean |
2 |
3 |
['ZRTMRH', 'github-actions'] |
nobody |
5-11226 5 days ago |
5-14343 5 days ago |
5-14336 5 days |
0 |
| 41861 |
stalex444 author:stalex444 |
feat(Algebra/Order/Floor): floor-of-sum dichotomy via fractional parts |
This PR adds four lemmas in Mathlib/Algebra/Order/Floor/Ring.lean, placed in the fractional-part section, complementing the existing one-sided bounds le_floor_add and le_floor_add_floor.
Here are the lemmas:
* floor_add_eq — writes ⌊a + b⌋ exactly as ⌊a⌋ + ⌊b⌋ + ⌊fract a + fract b⌋
* floor_add_eq_add_iff — the floors add exactly ⟺ the fractional parts sum below 1
* floor_add_eq_add_add_one_iff — the +1 case ⟺ the fractional parts sum to at least 1
* floor_add_eq_or — the dichotomy: it's always one or the other
The library has the two inequalities but not the exact case analysis, and this closes that small gap. In addition, these are the lemmas for the mechanical/Beatty-word development proposed here --https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Sturmian.20.28mechanical.29.20words/near/610836902.
Claude helped draft the Lean code; I reviewed the code, built the module locally, and it compiled.
---
I'm flexible on the lemma names should reviewers prefer different forms
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- Vector.* -> List.Vector.*
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- Nat.bit1_add_bit1
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[](https://gitpod.io/from-referrer/)
|
t-algebra
LLM-generated
new-contributor
maintainer-merge
label:t-algebra$ |
47/0 |
Mathlib/Algebra/Order/Floor/Ring.lean |
1 |
16 |
['BoltonBailey', 'github-actions', 'mathlib-merge-conflicts', 'stalex444', 'themathqueen'] |
nobody |
5-7904 5 days ago |
5-9678 5 days ago |
70-26119 70 days |
0 |
| 41957 |
YijunYuan author:YijunYuan |
feat(NumberTheory/Padics/Complex): add densely normed field and separable space instances |
Equip the field `ℂ_[p]` of `p`-adic complex numbers and its dense subfield
`PadicAlgCl p` (the algebraic closure of `ℚ_[p]`) with two further standard
typeclass instances.
Main additions:
* `DenselyNormedField (PadicAlgCl p)`: the norm takes values dense in the
positive reals. The witness between two given bounds `a < b` is built from an
`n`-th root `z` of `p` (which exists since `PadicAlgCl p` is algebraically
closed): choosing `n` so that `(a / b) ^ n < ‖p‖` gives `a / b < ‖z‖ < 1`, and
some integer power `z ^ m` then has norm strictly between `a` and `b`.
* `SeparableSpace (PadicAlgCl p)`: the elements algebraic over `ℚ` form a
countable dense subset. Density follows from continuity of roots — `α` is a
root of its minimal polynomial `f` over `ℚ_[p]`, and approximating the
coefficients of `f` by a polynomial `g` over the dense subfield `ℚ` yields a
root `β` of `g` (hence algebraic over `ℚ`) arbitrarily close to `α`.
* The corresponding instances `DenselyNormedField ℂ_[p]` and
`SeparableSpace ℂ_[p]` are then inferred, `ℂ_[p]` being the completion of
`PadicAlgCl p`.
Supporting general instance:
* `DenselyNormedField (UniformSpace.Completion A)` for a densely normed field
`A` with `CompletableTopField A`, since the norm on the completion extends the
norm on `A`.
The existing `NontriviallyNormedField` instances on `PadicAlgCl p` and `ℂ_[p]`
are simplified to `inferInstance`, as they now follow from the new
`DenselyNormedField` instances. |
new-contributor
t-number-theory
t-algebra
label:t-algebra$ |
123/19 |
Mathlib/Analysis/Normed/Field/Dense.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/NumberTheory/Padics/Complex.lean |
3 |
11 |
['YijunYuan', 'github-actions', 'mathlib-merge-conflicts', 'pechersky', 'riccardobrasca'] |
alreadydone assignee:alreadydone |
5-6101 5 days ago |
16-54034 16 days ago |
81-9467 81 days |
0 |
| 44786 |
ZRTMRH author:ZRTMRH |
feat(Lean/Quote): restore `Quote` instances for `Int` and `Rat` |
Add `Quote Int` and `Quote Rat` instances, analogous to core's `Quote Nat`.
They turn a number into numeral syntax without a type ascription (e.g. `quote (-7 / 2 : ℚ)` is `-7 / 2`), so the result elaborates at the expected type. These could later be upstreamed to Lean core.
These instances were added in #942 as part of `polyrith`, fixed in #24470, and removed together with the implementation of `polyrith` in #29547. This PR restores them unchanged (apart from naming) in their own file. Tests provided.
Motivated from the project of `maximize` / `minimize` tactics (PR to follow) which print a computed rational bound in a "Try this" suggestion such as `have : 4 * x + y ≤ 7 / 2 := by linarith`. Discussed on Zulip: [maximize / minimize tactic for linear optimization](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/maximize.20.2F.20minimize.20tactic.20for.20linear.20optimization).
The test file is refined with AI assistance (Claude) and has been reviewed by the author.
Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Co-authored-by: Aaron Liu <aaronliu2008@outlook.com>
---
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-->
|
t-meta
LLM-generated
new-contributor
|
164/0 |
Mathlib.lean,Mathlib/Lean/Quote.lean,MathlibTest/Quote.lean |
3 |
3 |
['ZRTMRH', 'github-actions'] |
nobody |
5-2356 5 days ago |
5-2982 5 days ago |
5-2975 5 days |
0 |
| 44214 |
ZRTMRH author:ZRTMRH |
feat(Analysis/SpecialFunctions): taylor series bounds for sin and cos |
Adds `Mathlib/Analysis/SpecialFunctions/Trigonometric/SeriesBounds.lean` with three groups of results:
1. Remainder bounds on the unit disc at every order: `Complex.sin_series_bound`, `Complex.cos_series_bound` and their real forms. Ported from #29355, taken over with the author's agreement. This PR supersedes #29355, which can be closed when this lands.
2. `Real.sum_lt_sin_of_pos`, `Real.sin_lt_sum_of_pos`, `Real.sum_lt_cos_of_pos`, and `Real.cos_lt_sum_of_pos`: `sin x` and `cos x` lie between consecutive partial sums of their Taylor series. Yury posted on Zulip in October 2025 with a request that someone open a PR for it ([Upper and Lower Bounds of Cosine](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Upper.20and.20Lower.20Bounds.20of.20Cosine/near/546287708)), it had not been opened.
4. Six low-order corollaries, as completion to `one_sub_sq_div_two_lt_cos` and `sin_gt_sub_cube` which Mathlib already has: `cos_lt/le_one_sub_sq_div_two_add_pow_four`, `sin_lt/le_sub_cube_add_pow_five`, and `sub_cube_add_pow_five_lt/le_sin` for negative arguments.
The 6 low-order corollaries and the docstrings were written with AI assistance (Claude). The code has been reviewed by the author.
Co-authored-by: Geoffrey Irving <irving@naml.us>
Co-authored-by: Yury G. Kudryashov <urkud@urkud.name>
---
<!-- Your PR title will become the first line of the commit message.
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each co-author among the commits in the pull request. If necessary, you
may create empty commits to indicate co-authorship, using commands like so:
git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
Second, co-authors can also be listed in lines at the very bottom of
the commit message (that is, directly before the `---`) using the following format:
Co-authored-by: Author Name <author@email.com>
If you are moving or deleting declarations, please include these lines
at the bottom of the commit message (before the `---`, and also before
any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
- ...
Any other comments you want to keep out of the PR commit should go
below the `---`, and placed outside this HTML comment, or else they
will be invisible to reviewers.
If this PR depends on other PRs, please list them below this comment,
using the following format:
- [ ] depends on: #abc [optional extra text]
- [ ] depends on: #xyz [optional extra text]
-->
|
LLM-generated
new-contributor
t-analysis
|
302/0 |
Mathlib.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/SeriesBounds.lean |
3 |
53 |
['SnirBroshi', 'ZRTMRH', 'github-actions', 'wwylele'] |
nobody |
4-85486 4 days ago |
5-1743 5 days ago |
15-15070 15 days |
0 |
| 44684 |
josephqian507 author:josephqian507 |
feat(LinearAlgebra/Matrix): add row equivalence and echelon form lemmas |
feat(LinearAlgebra/Matrix): add row equivalence and echelon form lemmas
This adds lemmas to bridge the current mathlib definition of row equivalence with the idea of two matrices that have the same null space. It also adds a proof that the reduced row echelon form of a matrix is unique. LLMs were used to fill in sorrys for some proofs (specifically, rowEquivalent_of_mul_eq_zero, rowEquivalent_iff_ker_eq, and much of RrefUniqueness.lean)
Co-authored-by: Junye Ji <junyej@uw.edu>
Co-authored-by: Dhruv Bhatia <dbhatia1@uw.edu>
---
<!-- Your PR title will become the first line of the commit message.
In this box, the text above the `---` (if not empty) will be appended
to the commit message, and can be used to give additional context or
details. Please leave a blank newline before the `---`, otherwise GitHub
will format the text above it as a title.
For details on the "pull request lifecycle" in mathlib, please see:
https://leanprover-community.github.io/contribute/index.html
In particular, note that most reviewers will only notice your PR
if it passes the continuous integration checks.
Please ask for help on https://leanprover.zulipchat.com if needed.
When merging, all the commits will be squashed into a single commit
listing all co-authors.
Co-authors in the squash commit are gathered from two sources:
First, all authors of commits to this PR branch are included. Thus,
one way to add co-authors is to include at least one commit authored by
each co-author among the commits in the pull request. If necessary, you
may create empty commits to indicate co-authorship, using commands like so:
git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
Second, co-authors can also be listed in lines at the very bottom of
the commit message (that is, directly before the `---`) using the following format:
Co-authored-by: Author Name <author@email.com>
If you are moving or deleting declarations, please include these lines
at the bottom of the commit message (before the `---`, and also before
any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
- ...
Any other comments you want to keep out of the PR commit should go
below the `---`, and placed outside this HTML comment, or else they
will be invisible to reviewers.
If this PR depends on other PRs, please list them below this comment,
using the following format:
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- [ ] depends on: #xyz [optional extra text]
-->
|
t-algebra
new-contributor
large-import
LLM-generated
label:t-algebra$ |
501/1 |
Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Echelon/Basic.lean,Mathlib/LinearAlgebra/Matrix/Echelon/RrefUniqueness.lean,Mathlib/LinearAlgebra/Matrix/ElementaryRowOperations.lean |
4 |
3 |
['github-actions', 'josephqian507'] |
nobody |
4-71085 4 days ago |
4-71771 4 days ago |
5-84659 5 days |
0 |
| 44734 |
mycaule author:mycaule |
feat(RingTheory/LocalProperties/Semilocal): semilocal rings have stable range one |
Add `IsCoprime.exists_isUnit_add_mul` to `Mathlib/RingTheory/LocalProperties/Semilocal.lean`: in a commutative ring `R` with finitely many maximal ideals (`[Finite (MaximalSpectrum R)]`), if `a` and `b` are coprime, then `a + t * b` is a unit for some `t ∈ R`. In other words, a semilocal ring has stable range one (Bass, *K-theory and stable algebra*, 1964). The proof applies the Chinese remainder theorem (`Ideal.exists_forall_sub_mem_ideal`) to the maximal ideals: `t ≡ 0` modulo those containing `b`, and `t ≡ b⁻¹ (1 - a)` modulo the others. `docs/references.bib` gains Bass (1964).
Questions for reviewers: whether this belongs in `LocalProperties/Semilocal.lean` (which is about local properties) or next to the Chinese remainder theorem in `RingTheory/Ideal/Quotient/Operations.lean`; whether a `StableRange` definition would be wanted, with this as its first instance.
AI disclosure: the Lean proof was written by an AI model (Claude, Anthropic) under my direction. I have read and checked it and will handle the review. It builds against current master.
|
t-ring-theory
new-contributor
LLM-generated
|
42/0 |
Mathlib/RingTheory/LocalProperties/Semilocal.lean,docs/references.bib |
2 |
5 |
['github-actions', 'mycaule', 'vlad902'] |
nobody |
4-51363 4 days ago |
5-72580 5 days ago |
5-72573 5 days |
0 |
| 44769 |
mycaule author:mycaule |
feat: volume of solids of revolution and of cones |
A new file `Mathlib/MeasureTheory/Measure/Lebesgue/SolidOfRevolution.lean` with the disc method for volumes of solids of revolution, in `ℝ × EuclideanSpace ℝ (Fin 2)`:
* `MeasureTheory.Measure.prod_setOf_mem_closedBall`: Cavalieri's principle for regions whose slices are closed balls, for any product `μ.prod ν` (`ν` s-finite, `E` a pseudometric space with `OpensMeasurableSpace`):
`μ.prod ν {p | p.1 ∈ s ∧ p.2 ∈ closedBall c (r p.1)} = ∫⁻ x in s, ν (closedBall c (r x)) ∂μ`.
* `EuclideanSpace.volume_setOf_mem_norm_le`: `volume {p : ℝ × ℝ² | p.1 ∈ s ∧ ‖p.2‖ ≤ r p.1} = ∫⁻ x in s, ENNReal.ofReal (r x) ^ 2 * ENNReal.ofReal π` (no sign condition on `r` is needed).
* `EuclideanSpace.volume_solidOfRevolution`: if `f` is continuous and nonnegative on `[a, b]`, then the solid of revolution has volume `ENNReal.ofReal (π * ∫ x in a..b, f x ^ 2)`.
* `EuclideanGeometry.euclideanHausdorffMeasure_cone` (in `Mathlib/Geometry/Euclidean/Volume/MeasureSimplex.lean`, right before the simplex formula it generalizes; suggested in review): in an affine subspace `T` of dimension `d + 1`, the cone with apex `a ∈ T` over a measurable base `B` contained in an affine subspace `S ≤ T` with `a ∉ S` has volume `μHE[d + 1] = h * μHE[d] B / (d + 1)`, with `h = dist a (orthogonalProjection S a)`. Proved by slicing with `euclideanHausdorffMeasure_eq_lintegral_of_subset` (slices are `homothety a x '' B`).
* The simplex formula `Affine.Simplex.euclideanHausdorffMeasure_closedInterior` is the special case of a cone over a face; its proof is left unchanged here, and could be derived from the cone theorem in a follow-up.
* `EuclideanSpace.volume_cone`: the cone of radius `R` and height `H` has volume `π * R ^ 2 * H / 3`.
The proofs use `Measure.prod_apply` (slices are balls) and `EuclideanSpace.volume_closedBall_fin_two`.
Happy to change the ambient space (e.g. `EuclideanSpace ℝ (Fin 3)` with rotation around a coordinate axis) or the file location if reviewers prefer.
AI disclosure: the statements and proofs were drafted with Claude (Claude Code) and checked by compiling against Mathlib; I have reviewed them.
---
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
t-measure-probability
LLM-generated
new-contributor
|
237/10 |
Mathlib.lean,Mathlib/Geometry/Euclidean/Volume/MeasureSimplex.lean,Mathlib/MeasureTheory/Measure/Lebesgue/SolidOfRevolution.lean |
3 |
8 |
['github-actions', 'mycaule', 'vihdzp', 'wwylele'] |
nobody |
4-40597 4 days ago |
5-44075 5 days ago |
5-44068 5 days |
0 |
| 44784 |
shunfeng8421 author:shunfeng8421 |
feat(Combinatorics): prove finitary Van der Waerden by compactness |
Proves the finitary version of Van der Waerden's theorem:
```lean
theorem van_der_waerden (k : ℕ) {κ : Type*} [Finite κ] [Nonempty κ] :
∃ N : ℕ, ∀ C : Fin (N + 1) → κ, HasMonoAPWithin k N C
```
i.e. every finite coloring of a sufficiently large initial segment `[0, N]`
contains a monochromatic arithmetic progression of length `k`.
This resolves the TODO in `Mathlib/Combinatorics/HalesJewett.lean` asking for a
finitary version of Van der Waerden's theorem.
## Proof sketch
The proof goes by compactness (Rado's selection lemma), the route explicitly
suggested in the TODO ("either by compactness or by modifying the current
proof"):
1. Assume the theorem fails: every segment `[0, N]` admits a "bad" coloring with
no monochromatic AP of length `k`.
2. For each finite set `s ⊆ ℕ`, pick the bad coloring of the covering interval
`[0, s.sup id]` and extend it (arbitrarily) to all of `ℕ`.
3. **Rado's selection lemma** (`Finset.rado_selection`, from
`Mathlib/Combinatorics/Compactness.lean`, itself proved via Tychonoff's
theorem) stitches these local bad colorings into a global coloring
`χ : ℕ → κ` that agrees with some local bad coloring on every finite set.
4. The **infinite** Van der Waerden theorem — `Combinatorics.exists_mono_homothetic_copy`,
a corollary of Hales–Jewett — produces a monochromatic AP `(a * t + b)_{t < k}`
in `χ`.
5. Viewed as a finite set, this AP lies inside the covering interval of some
finite set `t` on which the bad coloring agrees with `χ`, so it is also
monochromatic there — contradicting badness of that local coloring.
No explicit bounds are produced; this is purely an existence proof, which is
exactly what the compactness route buys.
## New definitions
- `Combinatorics.HasMonoAPWithin k N C`: the coloring `C : Fin (N+1) → κ` of the
initial segment `[0, N]` contains a monochromatic AP of length `k`.
## Changes
- `Mathlib/Combinatorics/HalesJewett.lean`: removed the completed TODO item
("Prove a finitary version of Van der Waerden's theorem ... by compactness"),
added a pointer to the new theorem in the "Main results" list.
- `Mathlib/Combinatorics/VanDerWaerden.lean`: new file.
## Notes for the reviewer
- The file header still contains the `[Author]` placeholder: fill in your name
before committing.
-------
**AI disclosure**: AI-assisted tools were used to draft the proof outline and Lean code, and to debug type/simplifier issues; all contributions were reviewed and verified by the author, who takes full responsibility for the correctness of the mathematics and code.
|
t-combinatorics
new-contributor
LLM-generated
|
100/3 |
Mathlib.lean,Mathlib/Combinatorics/HalesJewett.lean,Mathlib/Combinatorics/VanDerWaerden.lean |
3 |
5 |
['github-actions', 'grunweg', 'shunfeng8421'] |
nobody |
4-15588 4 days ago |
4-15588 4 days ago |
4-23937 4 days |
0 |
| 42353 |
sankalpsthakur author:sankalpsthakur |
feat(RingTheory): add nilpotence lemmas for zero sums |
In a commutative semiring, adds:
- `sq_eq_sq_of_add_eq_zero`: if `x + y = 0` then `x^2 = y^2`
- `IsNilpotent.of_add_eq_zero_left`: if `x + y = 0` and `y` is nilpotent, so is `x`
- `isNilpotent_iff_of_add_eq_zero`: under `x + y = 0`, `x` is nilpotent iff `y` is
Motivated by #10539.
### Validation
Built locally: `lake build Mathlib.RingTheory.Nilpotent.Basic` — succeeds.
Closes #10539
### AI/LLM disclosure
AI coding tools were used to help draft this change and PR description. I reviewed the complete change, understand the reasoning, and verified the build locally before submitting. |
t-ring-theory
new-contributor
LLM-generated
|
49/0 |
Mathlib/RingTheory/Nilpotent/Basic.lean |
1 |
29 |
['github-actions', 'sankalpsthakur', 'tb65536'] |
nobody |
4-12002 4 days ago |
51-69586 51 days ago |
57-77367 57 days |
0 |
| 40472 |
karlesmarin author:karlesmarin |
feat(Combinatorics/SimpleGraph): oriented incidence matrix |
Defines the oriented incidence matrix `SimpleGraph.orientedIncMatrix` of a simple graph on a linearly ordered vertex type, with each edge oriented from its smaller to its larger endpoint, and proves `orientedIncMatrix_mul_transpose : N * Nᵀ = G.lapMatrix R`.
This covers, for a fixed orientation, the second TODO in `Mathlib/Combinatorics/SimpleGraph/IncMatrix.lean`.
Written with the help of an LLM (Claude).
|
new-contributor
LLM-generated
t-combinatorics
|
157/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/OrientedIncMatrix.lean |
2 |
21 |
['SnirBroshi', 'github-actions', 'karlesmarin'] |
b-mehta assignee:b-mehta |
4-6103 4 days ago |
19-27120 19 days ago |
126-54446 126 days |
0 |
| 44812 |
keithadler author:keithadler |
fix(MeasureTheory/Group/Arithmetic): make `Finset.measurable_prod` state the product of functions |
`Finset.measurable_prod` (and `Finset.measurable_sum`) had exactly the same statement and proof as `Finset.measurable_fun_prod`: `Measurable fun a ↦ ∏ i ∈ s, f i a`. Everywhere else in this file the plain name states the point-free form (`List.measurable_prod : Measurable l.prod`, `Finset.aemeasurable_prod : AEMeasurable (∏ i ∈ s, f i) μ`) and `_fun_` states the `fun a ↦ …` form. This makes `Finset.measurable_prod` state `Measurable (∏ i ∈ s, f i)`, proved through `Multiset.measurable_prod` the way `aemeasurable_prod` is, and proves `measurable_fun_prod` from it. The two uses that need the `fun` form, `IsProgressive.finsetProd` and `integral_id_stdGaussian`, now use `measurable_fun_prod` / `measurable_fun_sum`.
The three edited modules build and `lake exe runLinter` passes on them, on current `master`. I did not build the rest of Mathlib, so CI will show whether anything else used the old statement.
Found with [Lean Studio](https://github.com/keithadler/leanstudio)'s Find Similar Proofs. Prepared with AI assistance (Claude); I checked the change and the build.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
t-measure-probability
LLM-generated
new-contributor
|
9/9 |
Mathlib/MeasureTheory/Group/Arithmetic.lean,Mathlib/Probability/Distributions/Gaussian/Multivariate.lean,Mathlib/Probability/Process/Adapted.lean |
3 |
3 |
['github-actions', 'keithadler'] |
nobody |
4-4716 4 days ago |
4-5962 4 days ago |
4-5955 4 days |
0 |
| 44117 |
zblore author:zblore |
feat(Topology/Algebra): quotient topology on projective space and open quotient map |
This gives `ℙ K V` the quotient topology and shows `Projectivization.mk'` is an open quotient map when the units of `K` act continuously on `V`. It also adds the two instances the proof needs to `Topology/Algebra/MulAction.lean`. A `SubMulAction` inherits `ContinuousConstSMul`, and `Kˣ` acts continuously on the nonzero vectors.
This is the first step towards the Fubini-Study metric and measure on `ℂℙⁿ`. I discussed it on Zulip here https://leanprover.zulipchat.com/#narrow/id/617154981 and here https://leanprover.zulipchat.com/#narrow/id/625402419
I used Claude to draft the Lean against the existing Mathlib API. I've reworked and checked every line myself and can explain all of it.
---
|
t-topology
new-contributor
LLM-generated
|
116/0 |
Mathlib.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/Topology/Algebra/MulAction.lean,Mathlib/Topology/Algebra/Projectivization.lean |
4 |
7 |
['gasparattila', 'github-actions', 'zblore'] |
nobody |
3-66334 3 days ago |
23-55305 23 days ago |
23-55298 23 days |
0 |
| 43280 |
idontgetoutmuch author:idontgetoutmuch |
feat(Topology/VectorBundle): coordinate lemmas for the bundle of bilinear forms |
Two coordinate-level identities for the bundle of scalar-valued bilinear forms
`fun x ↦ E₁ x →L[𝕜] E₁ x →L[𝕜] 𝕜` over a vector bundle, added to
`Mathlib/Topology/VectorBundle/Hom.lean`:
- `inCoordinates_apply_eq₂_bilin`: specialisation of `inCoordinates_apply_eq₂` to
scalar-valued forms on a single bundle (`E₂ = E₁`, `E₃ = Bundle.Trivial B 𝕜`);
- `trivializationAt_symm_apply_bilin`: the inverse trivialization of the bilinear-forms
bundle, applied to fibre vectors, equals the model form on their images under
`continuousLinearMapAt`.
`Hom.lean` now imports `Mathlib.Topology.VectorBundle.Constructions`, which is needed
for the `Bundle.Trivial` instances used in these statements.
`inCoordinates_apply_eq₂_bilin` is used to simplify six proof steps in
`Mathlib/Topology/VectorBundle/Riemannian.lean`, which previously applied
`inCoordinates_apply_eq₂ h h (Set.mem_univ _)` and then simplified away the trivial-bundle
`linearMapAt` by hand. Two ad hoc `convert!` proofs there are replaced by the existing
`Trivialization.symm_linearMapAt`.
This is the first piece split out of #33714 (existence of a Riemannian metric on a
manifold), which will be rebased on top of this PR. |
t-topology
new-contributor
|
45/20 |
Mathlib/Topology/VectorBundle/Hom.lean,Mathlib/Topology/VectorBundle/Riemannian.lean |
2 |
21 |
['github-actions', 'grunweg', 'idontgetoutmuch'] |
grunweg assignee:grunweg |
3-41147 3 days ago |
23-38551 23 days ago |
45-52894 45 days |
0 |
| 40727 |
pepamontero author:pepamontero |
feat(Geometry/Manifold/Instances/Quotient): quotients of manifolds by smooth free properly discontinuous group actions are manifolds |
Add smooth manifold structure on orbit space `orbitRel.Quotient G M`.
This PR is a follow-up to #35653, which equipped `orbitRel.Quotient G M` with a `ChartedSpace` structure. Here we promote that to an `IsManifold I n` instance, assuming M itself is an `IsManifold I n` and `G` acts by
`ContMDiffConstSMul`.
This PR:
* Changes the charted space instance to use `IsLocalHomeomorph.chartedSpaceOfRightInverse` applied to `Quotient.out_eq`, so the charts come from an explicit local section `orbitRel.Quotient.localInverseAt x` of the quotient map at `x.out`.
* Adds some API on `localInverseAt` that is only relevant when we have an action (`localInverseAt_apply_mk_eq_smul`, `localInverseAt_symm_trans_eqOn_smul`, `exists_smul_mem_localInverseAt_target`)
* Defines the `transitionMap` between the charts of the quotient, and adds `transitionMap_locally_smul` which shows each transition map agrees near any point with `φ x⁻¹ ≫ (g • ·) ≫ φ y` for a single `g : G`.
* Uses the above to prove `isManifold_quotient_of_contMDiffSMul`.
This started as an ItaLean2025 project; here is the [Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/541885-ItaLean-2025/topic/Projects.3A.20Quotient.20Manifolds/with/575121158) dedicated to it.
Co-authored by: Enrique Díaz Blanco <qdiazblanco@gmail.com>
Co-authored by: Archie Browne <ajb421@ic.ac.uk>
--------
- [x] depends on: #41832
- [x] depends on: #41835
- [x] depends on: #42436
- [x] depends on: #42502
- [x] depends on: #41534
- [x] depends on: #43717
**Questions for reviewers**:
1. Should the acting group be `Γ` rather than `G`? Here `G` has no topology, and in other files `Γ` is used in this case.
2. Should `localInverseAt` be a `def` instead of an `abbrev`? It is an `abbrev` because there is already API for `IsLocalHomeomorph.localInverseAt` that I need.
3. Is changing the `ChartedSpace` instance to `Quotient.out` the right decision?
4. Should I write a definition for `(chartAt H x.out).symm ≫ₕ (g • ·) ≫ₕ chartAt H y.out` , similar to `transitionMap`?
|
new-contributor
large-import
t-differential-geometry
maintainer-merge
|
131/6 |
Mathlib/Geometry/Manifold/Instances/Quotient.lean |
1 |
87 |
['Deicyde', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'pepamontero', 'scholzhannah'] |
grunweg assignee:grunweg |
3-34043 3 days ago |
4-43573 4 days ago |
55-9702 55 days |
1 |
| 43871 |
manman4 author:manman4 |
feat(PowerSeries): add Lagrange inversion formula |
## What this PR adds
This PR formalizes the Lagrange inversion formula for formal power series over commutative rings without additive torsion (`HasUniqueDiv R`), together with divided versions over characteristic-zero fields.
For formal power series `P`, `Y`, and `H` over such a ring, suppose `Y = X * P.subst Y`. Then, for every natural number `n`, the Lagrange–Bürmann formula states:
```math
(n + 1)[X^{n + 1}]H(Y) = [X^n](H' P^{n + 1}).
```
The brackets denote coefficient extraction, and `H'` denotes the formal derivative of `H`. Over a characteristic-zero field, dividing by `n + 1` gives the usual coefficient formula.
## Proof and scope
The proof follows the inductive argument of Surya and Warnke. The torsion-free assumption is used to cancel multiplication by positive natural numbers.
Following the review suggestions, this PR is restricted to the torsion-free version.
## Motivation
Lagrange inversion is a classical tool in enumerative combinatorics, treated for example in Section 5.4 of Richard P. Stanley’s *Enumerative Combinatorics*, Volume 2. It gives coefficient formulas for implicitly defined generating functions, with applications to counting rooted trees and other recursively defined combinatorial structures.
My original motivation was to make this tool, which is also used in competitive programming, available in Mathlib.
## LLM
We (Julian and I) used Aristotle and Codex for code generation and ChatGPT and Claude for cleanup.
|
t-ring-theory
new-contributor
LLM-generated
|
212/0 |
Mathlib.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Derivative.lean,Mathlib/RingTheory/PowerSeries/LagrangeInversion.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean,docs/references.bib |
6 |
126 |
['JX-Mo', 'Julian-Kuelshammer', 'github-actions', 'manman4', 'wwylele'] |
nobody |
3-14393 3 days ago |
13-49887 13 days ago |
30-44854 30 days |
0 |
| 41308 |
sergantche author:sergantche |
feat: add `List.insertIdx_eraseIdx_getElem_perm` |
Adds `List.insertIdx_eraseIdx_getElem_perm`, showing that erasing an element by index and inserting it at any valid position gives a permutation of the original list.
This packages the existing lemmas `List.perm_insertIdx` and `List.getElem_cons_eraseIdx_perm` into a direct API lemma.
AI assistance was used in preparing this PR; I reviewed the statement and proof.
[](https://gitpod.io/from-referrer/) |
t-data
new-contributor
LLM-generated
|
5/0 |
Mathlib/Data/List/Perm/Basic.lean |
1 |
5 |
['github-actions', 'sergantche', 'vlad902'] |
eric-wieser assignee:eric-wieser |
3-6103 3 days ago |
96-15975 96 days ago |
100-19363 100 days |
0 |
| 42820 |
tolgadgrmnc27 author:tolgadgrmnc27 |
feat(Data/Nat/Choose): elementary Chernoff bound for tail sums of binomial coefficients |
Adds an elementary, purely combinatorial Chernoff-type bound on tail sums of
binomial coefficients:
```lean
theorem Nat.sum_Ico_choose_le_div (n m : ℕ) {x : α} (hx : 1 ≤ x) :
∑ j ∈ Ico m (n + 1), (n.choose j : α) ≤ (1 + x) ^ n / x ^ m
```
together with the specialization at `x = 2`:
```lean
theorem Nat.sum_Ico_choose_le_three_pow_div (n m : ℕ) :
∑ j ∈ Ico m (n + 1), (n.choose j : α) ≤ 3 ^ n / 2 ^ m
```
The proof is the classical exponential moment trick done combinatorially: for
`m ≤ j` and `1 ≤ x` we have `x ^ m ≤ x ^ j`, so the tail sum is bounded by
`x ^ (-m) * ∑ j, n.choose j * x ^ j = x ^ (-m) * (1 + x) ^ n` by the binomial
theorem. A helper `Nat.sum_range_choose_mul_pow` states the binomial theorem in
the convenient form `∑ j ≤ n, n.choose j * x ^ j = (1 + x) ^ n`.
### Why this is not already in Mathlib
* `Nat.sum_range_choose` gives the *total* sum `∑ j ≤ n, n.choose j = 2 ^ n`.
* `Mathlib/Data/Nat/Choose/Bounds.lean` bounds a *single* coefficient
(`choose_le_pow`, `choose_le_two_pow`, `choose_le_pow_div`, …).
* `Mathlib/Probability/Moments/SubGaussian.lean` has Chernoff/Hoeffding, but
measure-theoretically: using it for a counting argument requires setting up a
probability space with independent Bernoulli variables and translating back
to cardinalities.
I could not find a statement bounding a *partial* sum of binomial
coefficients. The version here needs no probability space and applies directly
to counting arguments (its original use was bounding the number of `n < 2 ^ k`
whose first `k` binary digits contain at least `m` ones).
### Notes
* Stated over a general `[Semifield α] [LinearOrder α] [IsStrictOrderedRing α]`,
matching the typeclass style of `Mathlib/Data/Nat/Choose/Bounds.lean`.
* `Ico m (n + 1)` rather than a `filter (m ≤ ·)` form, as is idiomatic in
Mathlib; the two are equal by `Finset.filter_le_eq_Ico`-style reasoning.
* Names are of course open to bikeshedding.
---
- [x] depends on: nothing
|
t-data
new-contributor
|
84/0 |
Mathlib.lean,Mathlib/Data/Nat/Choose/Tail.lean |
2 |
3 |
['github-actions'] |
nobody |
3-5192 3 days ago |
61-53476 61 days ago |
61-53469 61 days |
0 |
| 42802 |
Zeta-Wu author:Zeta-Wu |
feat(CategoryTheory): relate equivalences and skeletons |
This PR supersedes the previously closed PR #42789.
It adds several related characterizations of equivalences of categories, together with an API showing that an equivalence induces an isomorphism between the corresponding skeletons.
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|
t-category-theory
new-contributor
|
66/8 |
Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/Skeletal.lean |
2 |
36 |
['Zeta-Wu', 'github-actions', 'joelriou', 'robin-carlier'] |
joelriou assignee:joelriou |
2-79888 2 days ago |
2-81226 2 days ago |
54-30732 54 days |
0 |
| 39347 |
Sfgangloff author:Sfgangloff |
feat(SymbolicDynamics): refactor of Pattern and shift-invariance of shape languages for subshifts |
## Summary
This PR refactors Pattern.mulShift in Mathlib/Dynamics/SymbolicDynamics/Basic.lean and uses the cleaner definition to prove shift-invariance of the language of a subshift on a finite shape.
## Changes
Pattern.mulShift now returns a Pattern instead of a configuration (more natural).
- Old type: Pattern.mulShift : Pattern A G → G → (G → A)
- New type: Pattern.mulShift : Pattern A G → G → Pattern A G
- The result carries its support (p.support.image (v * ·)) and the
default-outside-support proof, so callers don't have to re-derive them.
The [IsLeftCancelMul G] hypothesis is moved to the lemmas that actually use it.
- The definition Pattern.mulShift itself no longer needs left-cancellation (it only
chooses a preimage noncomputably).
- The hypothesis is now stated on mulShift_config_apply_mul_left_of_mem and
mulOccursInAt_eq_cylinder directly, instead of being a section-level variable.
Renames following the type change.
- mulShift_apply_mul_left_of_mem → mulShift_config_apply_mul_left_of_mem (because we
now write (p.mulShift v).config instead of p.mulShift v).
New @[simp] and @[ext] lemmas for Pattern.
- Pattern.ext: two patterns are equal iff their supports agree and their
configurations agree on the support.
- Pattern.mulShift_support: the support of p.mulShift v is p.support.image (v * ·).
- Pattern.fromConfig_support: the support of fromConfig x U is U.
- Pattern.fromConfig_config_of_mem: on its support, fromConfig x U agrees with x.
New lemma Pattern.fromConfig_mulShift.
For a left inverse g' * g = 1, shifting the pattern fromConfig x U by g equals
fromConfig (mulShift g' x) (U.image (g * ·)).
New theorem MulSubshift.languageOn_image_mulShift.
For a subshift Y and elements g, g' with g * g' = 1 and g' * g = 1:
(fun p => p.mulShift g) '' Y.languageOn U = Y.languageOn (U.image (g * ·))
i.e. the language on the translated shape is exactly the image of the language on U
under the pattern-shift map. This gives a bijection between Y.languageOn U and
Y.languageOn (U.image (g * ·)), with inverse p ↦ p.mulShift g'. Stated for
left-cancellative monoids with an invertible element.
Updated docstrings for Pattern.mulShift and the renamed lemma to reflect the
bundled-Pattern return type and clarify which results need [IsLeftCancelMul G]. |
t-dynamics
new-contributor
|
144/47 |
Mathlib/Dynamics/SymbolicDynamics/Basic.lean |
1 |
13 |
['Sfgangloff', 'github-actions', 'mathlib-merge-conflicts', 'sgouezel'] |
urkud assignee:urkud |
2-68634 2 days ago |
2-69240 2 days ago |
63-20354 63 days |
0 |
| 44798 |
3y3y3y-huaiji author:3y3y3y-huaiji |
style(Order/Heyting): rename inf_himp to inf_himp_self |
Rename `inf_himp` to `inf_himp_self` to align with its dual `sup_sdiff_self` and companion lemma `himp_inf_self`, resolving an in-code TODO. Add a deprecated alias `inf_himp`.
---
> [!NOTE]
> **LLM Disclosure / AI Use**: This PR was prepared with the assistance of an LLM (`LLM-generated`). All proofs and statements have been formally verified by Lean 4 and checked with linters.
|
t-order
LLM-generated
new-contributor
|
5/4 |
Mathlib/Order/Heyting/Basic.lean |
1 |
3 |
['3y3y3y-huaiji', 'github-actions', 'plp127', 'vihdzp'] |
nobody |
2-65478 2 days ago |
4-30969 4 days ago |
4-30962 4 days |
0 |
| 43577 |
javgomzar author:javgomzar |
chore(Order/BooleanAlgebra): Add push tags |
Add push tags to some lemmas in Mathlib/Order/BooleanAlgebra/Set.lean
---
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[](https://gitpod.io/from-referrer/)
|
t-order
new-contributor
|
19/4 |
Mathlib/Order/BooleanAlgebra/Set.lean |
1 |
4 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
2-61256 2 days ago |
2-63791 2 days ago |
38-32439 38 days |
0 |
| 44756 |
mycaule author:mycaule |
feat(Algebra/Polynomial/RingDivision): polynomials coprime to `X - C a` |
Add to `Mathlib/Algebra/Polynomial/RingDivision.lean`, over a commutative ring:
`Polynomial.isCoprime_X_sub_C_iff`: `IsCoprime (X - C a) p ↔ IsUnit (p.eval a)`
`Polynomial.isCoprime_X_sub_C_iff_isUnit_sub`: `IsCoprime (X - C a) (X - C b) ↔ IsUnit (a - b)`; it replaces `isCoprime_X_sub_C_of_isUnit_sub`, which becomes a deprecated alias (its two uses in Mathlib are updated)
`Polynomial.isCoprime_X_iff`: `IsCoprime X p ↔ IsUnit (p.coeff 0)`
For the converse direction of the first lemma, evaluate a Bézout relation at `a`. For the direct one, write `p = (X - C a) * q + C (p.eval a)` (`X_sub_C_dvd_sub_C_eval`). Mathlib had `isCoprime_X_sub_C_of_isUnit_sub` (the case `p = X - C b`, one direction only) but not the general criterion.
AI disclosure: the Lean proof was written by an AI model (Claude, Anthropic) under my direction. I have read and checked it and will handle the review.
|
t-algebra
new-contributor
LLM-generated
label:t-algebra$ |
20/10 |
Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/Analysis/Complex/Polynomial/Basic.lean |
2 |
20 |
['github-actions', 'mycaule', 'themathqueen', 'vihdzp'] |
nobody |
2-33053 2 days ago |
2-34221 2 days ago |
5-38813 5 days |
0 |
| 44831 |
scottdhughes author:scottdhughes |
feat(Analysis/MeanInequalitiesPow): add a real power difference bound |
Add `Real.abs_rpow_sub_rpow_le` in `Mathlib/Analysis/MeanInequalitiesPow.lean`: for nonnegative real bases and `0 ≤ p ≤ 1`,
```lean
|a ^ p - b ^ p| ≤ |a - b| ^ p
```
Provide a direct scalar API for downstream fractional-power regularity estimates. Derive the bound from the neighboring `Real.rpow_add_le_add_rpow`, then handle the two input orders. Include both exponent endpoints. Add one lemma and its docstring, with no new imports.
---
Local validation on Lean/Mathlib 4.35.0:
- `lake build Mathlib.Analysis.MeanInequalitiesPow`
- `lake exe lint-style Mathlib.Analysis.MeanInequalitiesPow`
- Fresh source elaboration, exported-type and axiom checks, plus all 15 default declaration linters for the new lemma.
The axiom check reports only `propext`, `Classical.choice` and `Quot.sound`.
AI assistance: Codex adapted an existing downstream proof, searched Mathlib and relevant open PRs, drafted this description, and ran the local checks.
|
t-analysis
new-contributor
LLM-generated
|
19/0 |
Mathlib/Analysis/MeanInequalitiesPow.lean |
1 |
3 |
['copilot-pull-request-reviewer', 'github-actions', 'scottdhughes'] |
nobody |
2-30716 2 days ago |
3-33880 3 days ago |
3-33873 3 days |
0 |
| 44730 |
mycaule author:mycaule |
feat(Analysis/Real/OfDigits): rationals have eventually periodic digits |
Characterise rational numbers by their positional expansion, using the existing `Real.digits` / `Real.ofDigits` API:
* `Real.digits_ratCast_eventually_periodic`: for `q : ℚ` with `0 ≤ q`, there are `N` and `p > 0` with `digits q b (n + p) = digits q b n` for all `n ≥ N`.
* `Real.exists_ratCast_eq_ofDigits_of_eventually_periodic`: if `1 < b` and a digit sequence `a : ℕ → Fin b` is eventually periodic, then `ofDigits a` is rational.
* `Real.exists_ratCast_eq_iff_digits_eventually_periodic`: for `x ∈ [0, 1)` and `1 < b`, `x` is rational iff its digits are eventually periodic.
Proof sketch. For `x = r / s`, the `n`-th digit equals `(r * b ^ n % s) * b / s`, so it only depends on the remainder `r * b ^ n % s`; these remainders live in `Fin s`, hence repeat by pigeonhole, and from then on the sequence is periodic. Conversely, splitting `ofDigits` after `N` digits (`ofDigits_eq_sum_add_ofDigits`), the purely periodic tail `y` satisfies `y = S + b⁻ᵖ y` with `S` a finite rational sum, so `y = S / (1 - b⁻ᵖ)`.
"Eventually periodic" is spelled out as `∃ N p, 0 < p ∧ ∀ n ≥ N, …`; I'm happy to switch to an existing predicate if reviewers prefer one. Adds a (private) import of `Mathlib.Algebra.Order.Floor.Semifield` for `Nat.floor_div_eq_div`.
AI disclosure: the statements and proofs were drafted with Claude (Claude Code) and checked by compiling against Mathlib; I have reviewed them.
---
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
new-contributor
t-analysis
LLM-generated
|
101/0 |
Mathlib/Analysis/Real/OfDigits.lean,Mathlib/Data/Nat/Init.lean |
2 |
18 |
['github-actions', 'mycaule', 'themathqueen', 'vihdzp'] |
nobody |
2-28890 2 days ago |
2-28890 2 days ago |
5-2306 5 days |
0 |
| 42693 |
justin-palumbo author:justin-palumbo |
feat(Topology/MetricSpace): a Gδ subset of a Polish space is Polish |
Adds `IsGδ.polishSpace`: a Gδ subset of a Polish space is Polish, which strengthens the existing IsOpen.polishSpace.
The proof follows the outline in Anush Tserunyan's descriptive set theory notes, https://www.math.mcgill.ca/atserunyan/Teaching_notes/dst_lectures.pdf where it is attributed to A. Bernshteyn. The "usual" approach (as in Kechris's Classical Descriptive Set Theory) constructs a complete compatible metric (the "Alexandrov metric"). The approach taken here is snappier to formalize - the idea is to give a closed embeddding from the G\delta set into another Polish space, and appeal to the fact closed subsets of Polish spaces are Polish. [Note the Alexandrov metric is recoverable from the embedding via the induced complete metrics on the product topology.]
---
Question: `IsOpen.polishSpace` could now be proven directly from`isGδ.polishSpace`, and `CompleteCopy` completely retired. That feels cleaner to me, given `CompleteCopy` has had no users since it was ported along with everything else in 2023: #3357. The main argument for keeping is that leveraging `CompleteCopy` is slightly more explicit in proving that open subsets are Polish. Happy to remove in a follow-up, in this PR, or not at all :)
(Update: For now, marking as deprecated based on suggestion from @j-loreaux )
LLM usage disclaimer: I wrote an original local version of this PR myself, and then used Claude Opus to double-check / simplify / help me pull out names of relevant theorems from mathlib. The primary non-trivial contribution from LLM was idea of leveraging isClosed_eq (ie proving closure of range by framing the range of the embedding as a countable intersection of pairs satisfying closed equations). I take full responsibility for the code here |
new-contributor
t-topology
|
94/14 |
Mathlib/Topology/MetricSpace/Polish.lean |
1 |
21 |
['felixpernegger', 'github-actions', 'j-loreaux', 'justin-palumbo'] |
j-loreaux assignee:j-loreaux |
2-26940 2 days ago |
2-26958 2 days ago |
64-26731 64 days |
0 |
| 26479 |
thefundamentaltheor3m author:thefundamentaltheor3m |
feat(Analysis/Complex/CauchyIntegral): Cauchy–Goursat for Unbounded Rectangles |
In this PR, we prove versions of the Cauchy-Goursat theorem where the contours in question are rectangular and unbounded (ie, where the contours look like the $\bigsqcup$ symbol). I am not sure if I have formalised these in the best way, or if `Analysis.Complex.CauchyIntegral` is the best place for them (it might be prudent to reorganise the file into multiple files at some point), but I believe this is a useful result. Suggestions welcome.
---
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[](https://gitpod.io/from-referrer/)
|
new-contributor
t-analysis
sphere-packing
maintainer-merge
|
169/0 |
Mathlib/Analysis/Complex/CauchyIntegral.lean |
1 |
53 |
['github-actions', 'j-loreaux', 'loefflerd', 'mathlib-splicebot', 'mathlib4-merge-conflict-bot', 'ocfnash', 'thefundamentaltheor3m', 'themathqueen', 'wwylele'] |
j-loreaux assignee:j-loreaux |
2-26875 2 days ago |
16-6821 16 days ago |
143-86120 143 days |
0 |
| 44872 |
Fieldnote-Echo author:Fieldnote-Echo |
feat(Combinatorics/SimpleGraph/Metric): add distance lemmas for graph maps |
Graph homomorphisms map walks to walks of the same length, so they do not increase extended graph distance. For natural-valued distance, the corresponding bound requires source reachability because unreachable pairs use the junk value `0`.
Add:
- `SimpleGraph.Hom.edist_le`
- `SimpleGraph.Iso.edist_eq`
- `SimpleGraph.Hom.dist_le`
- `SimpleGraph.Iso.dist_eq`
Mark both isomorphism equalities as `@[simp]`. Refactor the existing distance-antitonicity results for graph inclusions through `Hom.ofLE`, making them special cases of the homomorphism bounds.
Discussed on Zulip: [distance and balls under graph maps](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/distance.20and.20balls.20under.20graph.20maps/with/631709959).
---
AI assistance: Codex helped search the local API, adapt proofs, and run local checks. The design decisions and mathematical motivations were mine. I reviewed and understand the statements and final implementation.
|
t-combinatorics
new-contributor
LLM-generated
maintainer-merge
|
23/13 |
Mathlib/Combinatorics/SimpleGraph/Metric.lean |
1 |
14 |
['Fieldnote-Echo', 'SnirBroshi', 'github-actions'] |
nobody |
2-17657 2 days ago |
2-19354 2 days ago |
2-22880 2 days |
0 |
| 44537 |
vincentqb author:vincentqb |
feat(Analysis/Convex/Cone): prove that open sets have open hulls |
This PR proves `ConvexCone.isOpen_hull`: if addition and multiplication by each fixed scalar are continuous, the convex cone hull of an open set is open. It defines `ConvexCone.interior`, with coercion, membership, and equality lemmas parallel to the closure API. The hull theorem then follows from cone minimality.
The original hypotheses do not suffice, see #44689 for a counterexample.
---
AI-assisted contribution.
|
t-analysis
LLM-generated
new-contributor
file-removed
|
57/24 |
Mathlib.lean,Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Analysis/Convex/Cone/Interior.lean,Wanted.lean,Wanted/Analysis/Convex/Cone/Basic.lean |
5 |
15 |
['github-actions', 'pepamontero', 'vincentqb'] |
nobody |
2-11751 2 days ago |
6-85351 6 days ago |
10-12219 10 days |
0 |
| 43040 |
Qinghev author:Qinghev |
feat(Analysis/Convex): add center mass residual identity |
This adds `Finset.sum_smul_sub_centerMass_eq_zero`, stating that the weighted sum of displacements from a finite center of mass is zero whenever the total weight is nonzero.
---
Codex assisted with drafting and verification. |
t-analysis
new-contributor
|
5/0 |
Mathlib/Analysis/Convex/Combination.lean |
1 |
2 |
['github-actions'] |
ADedecker assignee:ADedecker |
2-6101 2 days ago |
55-68610 55 days ago |
55-68603 55 days |
0 |
| 42995 |
jacob-greenfield author:jacob-greenfield |
feat: add `List.Pairwise.orderedInsert'`, `List.sortedLE_orderedInsert_lt`, and `List.sortedGE_orderedInsert_gt` |
Introduce a generalized `Pairwise.orderedInsert'` lemma to prove that `Pairwise r l` is maintained after performing an `orderedInsert` using a relation stronger than `r` under certain conditions. Prove `sortedLE_orderedInsert_lt`, showing that `l.orderedInsert (· < ·) a` preserves `SortedLE` for decidable total preorders (analogously for `sortedGE_orderedInsert_gt`). This is useful for inserting an element into a sorted list *behind* any other elements which compare equal.
---
<!-- Your PR title will become the first line of the commit message.
In this box, the text above the `---` (if not empty) will be appended
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Please ask for help on https://leanprover.zulipchat.com if needed.
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Co-authors in the squash commit are gathered from two sources:
First, all authors of commits to this PR branch are included. Thus,
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each co-author among the commits in the pull request. If necessary, you
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git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
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Co-authored-by: Author Name <author@email.com>
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any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
- ...
Any other comments you want to keep out of the PR commit should go
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I was hoping to avoid `omit`, but that would require moving all of `Pairwise.orderedInsert'`, `Pairwise.orderedInsert`, `pairwise_insertionSort`, `sublist_insertionSort'`, `pair_sublist_insertionSort'`, and `mergeSort_eq_insertionSort` after `end sort` on line 365 and reintroducing all the section variables. I also considered moving `Pairwise.orderedInsert'` somewhere _before_ `variable {α β : Type*} (r : α → α → Prop) (s : β → β → Prop)` on line 30, but that would place it before `orderedInsert` is defined. "Omit" seemed like the least invasive approach.
[](https://gitpod.io/from-referrer/)
|
t-data
new-contributor
|
27/11 |
Mathlib/Data/List/Sort.lean |
1 |
8 |
['github-actions', 'jacob-greenfield', 'theebayuser'] |
nobody |
2-5196 2 days ago |
56-82863 56 days ago |
56-82856 56 days |
0 |
| 43281 |
keyframe41 author:keyframe41 |
feat(NumberTheory/DiophantineApproximation): prove Hurwitz's approximation theorem |
Prove **Hurwitz's approximation theorem**: for irrational `ξ`, the set of rationals `q` with `|ξ - q| < 1 / (√5 * q.den ^ 2)` is infinite.
This strengthens `Real.infinite_rat_abs_sub_lt_one_div_den_sq_of_irrational` from`Mathlib/NumberTheory/DiophantineApproximation/Basic.lean`, which gives the same statement with constant `1` instead of `√5`. The constant `√5` is optimal, though the sharpness (using the golden ratio) is not included here.
The proof avoids continued fractions and opts for Farey brackets (quadruples `p/q < ξ < r/s` with `q * r - p * s = 1`) packaged as `Real.Hurwitz.IsFarey`. It uses the fact that at least one of `p/q`, `r/s`, and the mediant `(p + r)/(q + s)` satisfies the bound, as if not, we can contradict the irrationality of `√5`. By creating brackets of arbitrarily small width, infinitude follows by the same argument as in `Basic.lean`.
Some design choices:
* No `GenContFract` to avoid continued fractions/recursive sequences. This also follows the spirit of `Basic.lean`, which defines its own `Real.convergent` rather than building Legendre's theorem on `GenContFract.convs`.
* `Real.Hurwitz` namespace. Mirrors `Real.ContfracLegendre` in `Basic.lean` by putting the main result in `Real` and the technical material in a secondary namespace.
* `IsGoodApprox` is stated without division ** as `|y * ξ - x| * y * √5 < 1` for easier manipulation and linked to the quotient form in the actual theorem using `Real.Hurwitz.isGoodApprox_div_bound`.
---
I used Claude which suggested the overall strategy/lemmas and reviewed naming and documentation against the mathlib conventions. All proofs are my own. As a first-time contributor, AI was also used to help in learning Lean.
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t-number-theory
new-contributor
|
359/0 |
Mathlib.lean,Mathlib/NumberTheory/DiophantineApproximation/Hurwitz.lean |
2 |
11 |
['SnirBroshi', 'github-actions'] |
nobody |
2-5193 2 days ago |
45-69915 45 days ago |
45-71107 45 days |
0 |
| 44885 |
3y3y3y-huaiji author:3y3y3y-huaiji |
feat(Combinatorics/Quiver/Path): monotonicity of valuations and cycle obstruction |
Define monotonicity of vertex valuations along paths in a quiver and deduce that
strict valuations rule out non-trivial cycles. As a consequence, `Reachable` is a
partial order when such a valuation exists.
---
> [!NOTE]
> **LLM Disclosure / AI Use**: This PR was prepared with the assistance of an LLM
> (`LLM-generated`). All proofs and statements have been formally verified by Lean 4
> and checked with linters. |
t-combinatorics
LLM-generated
new-contributor
|
64/1 |
Mathlib/Combinatorics/Quiver/Path.lean |
1 |
3 |
['3y3y3y-huaiji', 'github-actions'] |
nobody |
1-74949 1 day ago |
1-74949 1 day ago |
1-74942 1 day |
0 |
| 44634 |
3y3y3y-huaiji author:3y3y3y-huaiji |
refactor(RingTheory/Ideal): deprecate Ideal.mul_eq_inf_of_coprime |
Deprecate `Ideal.mul_eq_inf_of_coprime` in favor of `Ideal.mul_eq_inf_of_isCoprime`, resolving the TODO in `Mathlib/RingTheory/Ideal/Operations.lean`.
---
> [!NOTE]
> **LLM Disclosure / AI Use**: This PR was prepared with the assistance of an LLM (`LLM-generated`). All proofs and statements have been formally verified by Lean 4 and checked with linters.
|
t-ring-theory
LLM-generated
new-contributor
|
10/8 |
Mathlib/RingTheory/Ideal/Operations.lean |
1 |
4 |
['3y3y3y-huaiji', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
1-58351 1 day ago |
5-49911 5 days ago |
7-74173 7 days |
0 |
| 44810 |
zixiaowang17 author:zixiaowang17 |
feat(Combinatorics): add abstract graphical Markov properties |
Introduce the global, local, and pairwise Markov properties for undirected graphs, and prove
the forward implications global → local → pairwise under the semigraphoid axioms.
The implementation is a single module importing `Mathlib.Combinatorics.SimpleGraph.Walk.Basic`.
The current framework allows arbitrary vertex types, including infinite and uncountable types.
Reference: David Montague and Bala Rajaratnam, *Graphical Markov models for infinitely many
variables*, *Transactions of the American Mathematical Society* **370** (2018), no. 11,
7557–7603. [doi:10.1090/tran/7048](https://doi.org/10.1090/tran/7048).
---
I want to introduce “a graphical framework in which we can analyze the Markov properties
from a purely set theoretic perspective which is independent of probability theory,” as
described in [Section 4](https://arxiv.org/pdf/1501.07878#page=8).
Motivation: I was trying to provide a common foundation connecting graphical models in
statistics, random fields, and percolation on lattices. Along the way, I found that most of
the materials I read assumed finite vertex sets. However, I want to understand better what
drives the equivalence of the Markov properties, so that we can talk about theorems with
more flexibility. I then found this paper, which, in Section 4, takes a purely set-theoretic approach
to independence and graphical Markov properties, separately from its treatment of
measure-theoretic conditional independence in probabilistic models.
If this PR meets the requirements and is in the right direction, I plan to finish proving
the equivalence of the pairwise, local, and global Markov properties for ternary relations
under suitable intersection assumptions. In the long term, I plan to connect conditional
independence in probability with graphical models, including DAGs.
AI assistance: OpenAI Codex assisted with the Lean definitions and proofs. I checked every
line of the code. |
t-combinatorics
LLM-generated
new-contributor
|
138/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Markov.lean,docs/references.bib |
3 |
4 |
['github-actions', 'zixiaowang17'] |
nobody |
1-46989 1 day ago |
4-9920 4 days ago |
4-9913 4 days |
0 |
| 44906 |
yudukikun5120 author:yudukikun5120 |
feat(Archive): formalize negation in vector logic |
This adds a formalization of negation in Mizraji's two-valued vector logic to `Archive/VectorLogic.lean`, using mathlib's matrix and real-number APIs.
For two orthonormal real vectors `s` and `n` in an arbitrary finite-dimensional coordinate space, define `N = nsᵀ + snᵀ` and the logical identity `I₂ = ssᵀ + nnᵀ`. Prove that negation exchanges the truth vectors, exchanges the coefficients of their linear combinations, and satisfies `N * N = I₂`. Double negation fixes every linear combination of the truth vectors. The formalization also shows that negation annihilates vectors orthogonal to both, so it does not assert that `N²` is the ambient identity in higher dimension.
The definitions follow Eduardo Mizraji's *Vector logics: The matrix-vector representation of logical calculus* (1992), as reproduced in §4.2, equations (15)–(16), of his 2016 paper: https://doi.org/10.1387/theoria.13959.
---
This is a draft for feedback on whether this paper-specific formalization is suitable for `Archive`; its placement has not been agreed with maintainers.
Validation on macOS arm64 with Lean 4.35.0:
- `lake build Archive.VectorLogic`
- `lake exe lint-style Archive.VectorLogic`
- `lake exe mk_all --lib Archive --check`
- Separate local checks with a three-dimensional truth pair, including a counterexample to the ambient identity assertion.
AI disclosure: OpenAI Codex generated the implementation, proofs, and this PR description, and ran the local validation. The changes are marked as LLM-generated. This description does not claim completion of independent human review.
|
LLM-generated
new-contributor
|
102/0 |
Archive.lean,Archive/VectorLogic.lean |
2 |
3 |
['github-actions', 'yudukikun5120'] |
nobody |
1-42340 1 day ago |
1-42349 1 day ago |
1-42342 1 day |
0 |
| 43349 |
Nicola9Falciola author:Nicola9Falciola |
feat(Algebra/FreeAbelianGroup/Finsupp): add api for the coeff of a single element |
---
Add three API lemmas computing the coefficent of the elements `of x` for `x : X` in the FreeAbelianGroup.
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[](https://gitpod.io/from-referrer/)
|
new-contributor
t-algebra
maintainer-merge
label:t-algebra$ |
7/0 |
Mathlib/Algebra/FreeAbelianGroup/Finsupp.lean |
1 |
10 |
['Nicola9Falciola', 'github-actions', 'themathqueen'] |
nobody |
1-41348 1 day ago |
2-20025 2 days ago |
44-31270 44 days |
0 |
| 44878 |
scottdhughes author:scottdhughes |
feat(NumberTheory/Divisors): add a divisor-count doubling bound |
Adds `Nat.two_mul_card_divisors_le_card_divisors_mul_of_not_dvd`:
```lean
theorem Nat.two_mul_card_divisors_le_card_divisors_mul_of_not_dvd {a b : ℕ}
(hb : b ≠ 0) (hnot : ¬ b ∣ a) :
2 * a.divisors.card ≤ (a * b).divisors.card
```
The proof places the divisors of `a` and their images under multiplication by `b` inside the divisors of `a * b`. These sets are disjoint because `b ∤ a`, and multiplication by nonzero `b` preserves cardinality. The hypothesis `a ≠ 0` follows from nondivisibility; no coprimality hypothesis is needed.
Motivated by work on Erdős problem 647. The addition uses the existing finite-divisor API in `Mathlib/NumberTheory/Divisors.lean` and introduces no imports.
### Validation
- Fresh affected-module build with warnings treated as failures; style and default declaration linters passed.
- Checked the exported type, the original three-premise consumer interface, and boundary examples, including the sharp noncoprime case `(a, b) = (2, 4)`. The theorem uses only `propext`, `Classical.choice` and `Quot.sound`.
- Aggregate-import and diff checks passed. Whole-library builds and full hosted CI have not been run locally.
### AI disclosure
OpenAI Codex generated the standalone Lean proof from an existing lemma in our Erdős problem 647 development and assisted with API and overlapping-PR searches, integration, and local validation. Codex also drafted this description and performed an additional source review; that review did not include separate compilation. This contribution contains LLM-generated code.
|
t-number-theory
new-contributor
LLM-generated
|
28/0 |
Mathlib/NumberTheory/Divisors.lean |
1 |
2 |
['copilot-pull-request-reviewer', 'github-actions'] |
nobody |
1-34985 1 day ago |
1-35098 1 day ago |
1-35091 1 day |
0 |
| 44864 |
user202729 author:user202729 |
feat(Order/Bounds): notation for sSup and sInf |
Also fix a typo (add a full stop) and change some call sites to use the new notation.
---
As discussed on Zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Adding.20notation.20for.20sSup.2FsInf.3F |
t-topology
new-contributor
|
14/3 |
Mathlib/Order/Bounds/Defs.lean,Mathlib/Order/SetNotation.lean,Mathlib/Topology/Sets/Closeds.lean,Mathlib/Topology/Sets/Opens.lean |
4 |
5 |
['Multramate', 'github-actions', 'user202729'] |
nobody |
1-31349 1 day ago |
1-33997 1 day ago |
1-37751 1 day |
0 |
| 44723 |
mycaule author:mycaule |
feat(CategoryTheory/Adjunction/Idempotent): fixed points and idempotent adjunctions |
New file `Mathlib/CategoryTheory/Adjunction/Idempotent.lean`. For `adj : L ⊣ R` with unit `η` and counit `ε`:
`Adjunction.idempotent_tfae`: the four conditions `ηR`, `Rε`, `εL`, `Lη` invertible are equivalent
`Adjunction.map_map_unit_app_of_idempotent`, `Adjunction.map_map_counit_app_of_idempotent`: `RLη_X = η_{RLX}` and `LRε_Y = ε_{LRY}` in the idempotent case
`Adjunction.fixedLeft`, `Adjunction.fixedRight`: the objects at which `η`, resp. `ε`, is an isomorphism (closed under isomorphisms; `fixedLeft_iff_exists`, `fixedRight_iff_exists`)
`Adjunction.fixedEquiv`: for any adjunction, `L` and `R` restrict to an equivalence `adj.fixedLeft.FullSubcategory ≌ adj.fixedRight.FullSubcategory`
`Adjunction.fixedLeftAdjunction`, `Adjunction.fixedLeftReflective`: if the adjunction is idempotent, `fixedLeft` is reflective in `C` with reflector `L ⋙ R`
`Adjunction.fixedRightAdjunction`, `Adjunction.fixedRightCoreflective`: dually, `fixedRight` is coreflective in `D` with coreflector `R ⋙ L`
`map_map_unit_app_of_idempotent` is the generalization asked for by the TODO above `unit_obj_eq_map_unit` in `Adjunction/Reflective.lean` (from reflective to idempotent adjunctions).
Then `PreservesColimits` of the reflector, `HasColimits` of the fixed part (`hasColimits_of_reflective`) and the localization property (`Adjunction.isLocalization`) follow from existing mathlib lemmas.
Questions for reviewers: names (`fixedLeft`/`fixedRight`, or e.g. `unitIsIso`/`counitIsIso`); whether to add a class `Adjunction.IsIdempotent` (one of the four conditions) with instances for reflective and coreflective adjunctions, in this PR or a follow-up; and whether to add `IsIso adj.toMonad.μ ↔ idempotent` next to `μ_iso_of_reflective`.
AI disclosure: the Lean proof was written by an AI model (Claude, Anthropic) under my direction. I have read and checked it and will handle the review. It builds against current master.
|
t-category-theory
new-contributor
LLM-generated
|
257/0 |
Mathlib.lean,Mathlib/CategoryTheory/Adjunction/Idempotent.lean |
2 |
2 |
['github-actions'] |
dagurtomas assignee:dagurtomas |
1-24548 1 day ago |
5-61229 5 days ago |
5-61222 5 days |
0 |
| 42912 |
justin-palumbo author:justin-palumbo |
feat(Topology/GDelta): a completely metrizable subspace of a T6 space is Gδ |
Adds TopologicalSpace.IsCompletelyMetrizableSpace.isGδ: a completely metrizable subspace of a T6 space is Gδ
This is one direction of a foundational fact in descriptive set theory --- the Polish subspaces of a Polish space are exactly the Gδ subsets.
The proof here is modeled on the exposition in Anush Tserunyan's descriptive set theory notes https://www.math.mcgill.ca/atserunyan/Teaching_notes/dst_lectures.pdf, with one adjustment; to make the formalization easier and avoid having multiple distance metrics instantiated at the same time, instead of directly defining open `U_n` with `s = ⋂ n, U` define them such that `s = closure s ∩ ⋂ n, U n` and then appeal to the fact closed sets are Gδ in a perfectly normal space.
---
- [x] depends on: #42896 [which fixes buggy naming present in Topology/Metrizable/CompletelyMetrizable]
This can be viewed as a companion to #42693, which - under the stronger assumption of the ambient space being Polish - establishes the other direction --- a Gδ subspace of a Polish space is itself Polish.
Together, these give Alexandrov's theorem, characterizing the Polish subspaces of an ambient Polish space as exactly the Gδ ones, and (via `Metric.PiNatEmbed.exists_embedding_to_hilbert_cube`) Polish spaces as exactly the Gδ subsets of the Hilbert cube. If and when both these PRs are committed, I anticipate adding these consequences to Topology/MetricSpace/Polish.lean
LLM usage: I wrote the initial version myself, while using Google's free "AI mode" to help me find relevant lemma names in the codebase, and afterward used helped Claude Opus to review, which led to simplifying some of the arguments. I take full responsibility for the code here
|
t-topology
new-contributor
|
91/0 |
Mathlib.lean,Mathlib/Topology/GDelta/CompletelyMetrizable.lean |
2 |
8 |
['github-actions', 'justin-palumbo', 'mathlib-dependent-issues', 'plp127'] |
nobody |
1-5200 1 day ago |
58-49284 58 days ago |
58-49574 58 days |
0 |
| 41920 |
junjihashimoto author:junjihashimoto |
feat(Analysis/CliffordAlgebra): the pseudoscalar of Cl(n,0) and its complex structure |
We study the Clifford algebra of Euclidean `n`-space (the quadratic form `x ↦ ⟪x, x⟫_ℝ` on `EuclideanSpace ℝ (Fin n)`). The pseudoscalar `ω = e₀ ⋯ eₙ₋₁` satisfies
* `ω * ω = (-1) ^ (n.choose 2)` (`pseudoscalar_mul_pseudoscalar'`),
* `γᵢ * ω = (-1) ^ (n - 1) • (ω * γᵢ)` (`γ_mul_pseudoscalar`),
so it is central for odd `n`, and a square root of `-1` iff `n ≡ 2, 3 [MOD 4]`. In that case left multiplication by `ω` is a complex structure: we provide a scoped `Module ℂ` instance (via `Complex.liftAux` and `Module.compHom`; no commutation is needed for a module structure, which covers the non-central case `n ≡ 2 [MOD 4]`), and for `n ≡ 3 [MOD 4]` an `Algebra ℂ` structure as a non-instance def.
The sign computations are done by moving a generator through a product of distinct generators (`γ_mul_prod`, `γ_mul_prod_mem`, `prod_sq`), with no case analysis on `n`.
In a follow-up PR this makes the Clifford–Fourier transform (Ebling–Scheuermann) an instance of the ordinary vector-valued Fourier transform, giving Plancherel's theorem and the inversion formula.
- [ ] depends on: (nothing)
|
t-analysis
new-contributor
|
303/0 |
Mathlib.lean,Mathlib/Analysis/CliffordAlgebra/Euclidean.lean |
2 |
5 |
['eric-wieser', 'github-actions', 'j-loreaux'] |
nobody |
1-5196 1 day ago |
89-53554 89 days ago |
89-54047 89 days |
1 |
| 42380 |
matt-w-horn author:matt-w-horn |
feat(Algebra/Ring): add sum_range_mul_geometric_add |
Over a `CommRing`: `∑ k < m, k * (x ^ k * (1 - x)) + m * x ^ m = ∑ k ∈ Icc 1 m, x ^ k`. Summation by parts for the geometric sum; it computes the mean of a censored geometric distribution, which #42381 adds.
Used in Overload, a library on retry and overload dynamics, where it's stated over `ℝ` with a side condition that turns out to be unnecessary: https://github.com/matt-w-horn/overload/blob/4ecbebf/Overload/Retry/Amplification.lean
Claude Fable wrote the Lean from a spec I gave it. I reviewed and tested it myself, including adversarial tests and the suites in the library above, and did the same for its dependencies.
Assisted-by: Claude Fable 5 |
t-algebra
new-contributor
LLM-generated
label:t-algebra$ |
11/0 |
Mathlib/Algebra/Ring/GeomSum.lean |
1 |
7 |
['github-actions', 'matt-w-horn', 'themathqueen'] |
nobody |
1-1909 1 day ago |
1-2066 1 day ago |
64-71949 64 days |
0 |
| 42355 |
sankalpsthakur author:sankalpsthakur |
fix(NormNum): error if remaining at locations are unused |
`norm_num at h1 h2 ...` (and other tactics built on `Lean.Elab.Tactic.withNondepPropLocation`) unconditionally processed every hypothesis in the location list, then the target. If an earlier hypothesis closed the goal (e.g. `norm_num` found `h1` to already be `False`), processing continued against an already-closed goal instead of stopping.
Unused `at` locations now error if an earlier location closed the goal.
Closes #28703.
---------
Note. `withNondepPropLocation` currently has no other callers in the Mathlib tree besides its own definition file.
AI coding tools were used to help draft this change and PR description. I reviewed the complete change, understand the reasoning, and verified the build locally before submitting. |
new-contributor
LLM-generated
t-meta
maintainer-merge
|
32/2 |
Mathlib/Util/AtLocation.lean,MathlibTest/Tactic/NormNum/Basic.lean |
2 |
25 |
['github-actions', 'grunweg', 'joneugster', 'mathlib-merge-conflicts', 'sankalpsthakur', 'thorimur'] |
joneugster assignee:joneugster |
0-65782 18 hours ago |
34-72852 34 days ago |
54-74121 54 days |
0 |
| 42225 |
matt-w-horn author:matt-w-horn |
feat(Order): Knaster–Tarski fixed points on an interval |
`lfpIcc f a b` and `gfpIcc f a b`: least and greatest fixed points of `f` on `Set.Icc a b` in a conditionally complete lattice, for `f` monotone on the interval and mapping it into itself. Also interval membership, endpoint-iterate bounds, and monotonicity in `f`.
`OrderHom.lfp` gives this through the complete-lattice instance on the subtype, but wants a `Fact (a ≤ b)` and returns subtype elements. These take `MonotoneOn` and `MapsTo` directly and stay in `α`. Bridge lemmas between the two are a follow-up.
Used on intervals of ℝ in Overload, a sorry-free Lean library on retry and overload dynamics: https://github.com/matt-w-horn/overload/tree/main/Overload
Claude Fable wrote the Lean from a spec I gave it. I reviewed and tested it myself, including adversarial tests and the suites in the library above, and did the same for its dependencies.
Assisted-by: Claude Fable 5 |
t-order
new-contributor
LLM-generated
|
166/0 |
Mathlib.lean,Mathlib/Order/FixedPointsIcc.lean |
2 |
7 |
['github-actions', 'matt-w-horn', 'wwylele'] |
nobody |
0-64928 18 hours ago |
75-5055 75 days ago |
75-5048 75 days |
0 |
| 44902 |
leomayer1 author:leomayer1 |
chore(CategoryTheory/Shift): change notation to notation3 for better pretty printing |
In current master, `#check shiftAdd` for example yields
```
CategoryTheory.shiftAdd.{v, u, u_1} {C : Type u} {A : Type u_1} [Category.{v, u} C] [AddMonoid A] [HasShift C A] (X : C)
(i j : A) : (shiftFunctor C (i + j)).obj X ≅ (shiftFunctor C j).obj ((shiftFunctor C i).obj X)
```
This PR changes it to the more readable
```
CategoryTheory.shiftAdd.{v, u, u_1} {C : Type u} {A : Type u_1} [Category.{v, u} C] [AddMonoid A] [HasShift C A] (X : C)
(i j : A) : X⟦i + j⟧ ≅ X⟦i⟧⟦j⟧
```
---
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In particular, note that most reviewers will only notice your PR
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|
t-category-theory
new-contributor
easy
|
2/2 |
Mathlib/CategoryTheory/Shift/Basic.lean |
1 |
3 |
['github-actions', 'leomayer1'] |
nobody |
0-55851 15 hours ago |
0-56668 15 hours ago |
0-56661 15 hours |
0 |
| 38369 |
quantumsnow author:quantumsnow |
feat(AlgebraicTopology): Eilenberg Steenrod axioms |
This introduces the Eilenberg-Steenrod axioms for a homology theory.
---
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- [x] depends on: #36621
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- [x] depends on: #44044
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-algebraic-topology
large-import
increases-technical-debt
|
258/18 |
Mathlib/AlgebraicTopology/EilenbergSteenrod.lean,Mathlib/Topology/Category/TopPair.lean |
2 |
115 |
['Multramate', 'chrisflav', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'quantumsnow'] |
robin-carlier assignee:robin-carlier |
0-55131 15 hours ago |
0-55131 15 hours ago |
76-37920 76 days |
0 |
| 44442 |
aebrose author:aebrose |
feat(LinearAlgebra/LinearIndependent/Basic): scaling by right-regular elements preserves linear independence |
Add `LinearIndependent.smul_of_isRightRegular` which says that a linearly independent family stays linearly independent when scaling with right regular elements.
This generalizes `LinearIndependent.units_smul` which is the same statement for units instead of right-regular elements. The proof of `LinearIndependent.units_smul` is updated using the right-regular version.
---
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|
t-algebra
new-contributor
maintainer-merge
label:t-algebra$ |
12/6 |
Mathlib/LinearAlgebra/LinearIndependent/Basic.lean |
1 |
6 |
['aebrose', 'github-actions', 'tb65536', 'vlad902'] |
nobody |
0-54490 15 hours ago |
2-14357 2 days ago |
6-64580 6 days |
0 |
| 44286 |
user202729 author:user202729 |
chore(Algebra/Group): use normal typeclass syntax for `Normal` |
Use the normal syntax to make `Normal` a typeclass instead of `attribute [class] Normal`.
This affects the proofs depending on this typeclass by making the member accessor `conj_mem` taking the `Normal` instance as an instance-implicit argument instead of an explicit one. They were refactored by simply letting the compiler infer the instance, which it always succeeds for the cases found in mathlib.
---
More discussion: Another effect of using `class` instead of `structure` is that the `‹…›` syntax cannot be used, however, for this specific typeclass it is not affected. It affects `Unique` though (not touched here). |
new-contributor
t-group-theory
maintainer-merge
|
7/11 |
Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/Topology/Algebra/Group/Subgroup.lean |
6 |
7 |
['github-actions', 'mathlib-merge-conflicts', 'tb65536', 'user202729'] |
nobody |
0-54391 15 hours ago |
5-72001 5 days ago |
16-67180 16 days |
0 |
| 43216 |
JadAbouHawili author:JadAbouHawili |
feat(Combinatorics/SimpleGraph/Clique): independence number is zero iff the graph has no vertices |
---
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[](https://gitpod.io/from-referrer/)
|
new-contributor
t-combinatorics
|
46/3 |
Mathlib/Combinatorics/SimpleGraph/Clique.lean |
1 |
45 |
['JadAbouHawili', 'SnirBroshi', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
0-53858 14 hours ago |
41-33367 41 days ago |
45-9550 45 days |
0 |
| 44934 |
CollinYuanjieRen author:CollinYuanjieRen |
fix(linter): ignore declaration names in flexible linter |
Skip the declaration name when collecting stained locations from `letIdDecl`. This prevents `simp at h; let h := 3` (and the corresponding `have`) from being reported as a use of the old `h`, while preserving warnings for references in the declaration type or right-hand side.
Addresses the third example in #32257. Includes six regression cases.
---
Validation: `MathlibTest/Linter/Flexible/Basic.lean` passes on Lean 4.35.0. With the original implementation, the two new shadowing cases fail; the four true-reference controls pass.
AI assistance: Codex assisted with the fix and regression tests.
|
t-linter
LLM-generated
new-contributor
|
74/0 |
Mathlib/Tactic/Linter/FlexibleLinter.lean,MathlibTest/Linter/Flexible/Basic.lean |
2 |
3 |
['CollinYuanjieRen', 'github-actions'] |
nobody |
0-51247 14 hours ago |
0-53907 14 hours ago |
0-53900 14 hours |
0 |
| 44721 |
mycaule author:mycaule |
feat(Geometry/Euclidean/Projection): distance to a hyperplane via its normal vector |
Add the closed formula for the distance from a point to an affine hyperplane given by a normal vector, stated in the Euclidean-geometry normal form (distance to the orthogonal projection):
```lean
theorem EuclideanGeometry.dist_orthogonalProjection_eq_abs_inner_div_norm
(s : AffineSubspace ℝ P) [Nonempty s] [s.direction.HasOrthogonalProjection]
{n : V} (hn : s.directionᗮ = ℝ ∙ n) {q : P} (hq : q ∈ s) (p : P) :
dist p (orthogonalProjection s p) = |⟪n, p -ᵥ q⟫| / ‖n‖
```
Proof: `p -ᵥ orthogonalProjection s p = t • n` since it lies in `s.directionᗮ = ℝ ∙ n`, and `⟪n, p -ᵥ q⟫ = ⟪n, t • n⟫` because `orthogonalProjection s p -ᵥ q ∈ s.direction` is orthogonal to `n`. No hypothesis `n ≠ 0` is needed. The `Metric.infDist` form follows from `dist_orthogonalProjection_eq_infDist`.
As a corollary, without any new definition (the plane through `q` with normal vector `n` is `AffineSubspace.mk' q (ℝ ∙ n)ᗮ`):
```lean
theorem EuclideanGeometry.dist_orthogonalProjection_mk'_eq_abs_inner_div_norm (q : P) (n : V) (p : P) :
dist p (orthogonalProjection (AffineSubspace.mk' q (ℝ ∙ n)ᗮ) p) = |⟪n, p -ᵥ q⟫| / ‖n‖
```
together with an instance `(AffineSubspace.mk' q K).direction.HasOrthogonalProjection` for `K.HasOrthogonalProjection` (as for `perpBisector`). This adds a (non-public) import of `Mathlib.Analysis.InnerProductSpace.Projection.Submodule` for `Submodule.orthogonal_orthogonal`.
Context: this is the distance from a point to a plane `ax + by + cz + d = 0` as taught in the French high-school curriculum, `|ax₀ + by₀ + cz₀ + d| / √(a² + b² + c²)`.
AI disclosure: the statement and proof were drafted with Claude (Claude Code) and checked by compiling against Mathlib; I have reviewed them.
---
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
t-euclidean-geometry
new-contributor
LLM-generated
|
37/2 |
Mathlib/Geometry/Euclidean/Projection.lean |
1 |
18 |
['github-actions', 'jsm28', 'mycaule', 'vihdzp', 'wwylele'] |
jsm28 assignee:jsm28 |
0-49692 13 hours ago |
6-5518 6 days ago |
6-5511 6 days |
0 |
| 44727 |
mycaule author:mycaule |
feat(CategoryTheory/Monad/Monadicity): state the (co)monadicity theorem as an iff |
Add:
`Monad.isEquivalence_comparison_iff`: for `adj : F ⊣ G`, `(Monad.comparison adj).IsEquivalence` iff `G` reflects isomorphisms and, for every `G`-split pair `u, v`, `HasCoequalizer u v` and `PreservesColimit (parallelPair u v) G`
`Comonad.isEquivalence_comparison_iff`: the dual statement
instances `Monad.reflectsIsomorphisms_of_monadicRightAdjoint` and `Comonad.reflectsIsomorphisms_of_comonadicLeftAdjoint` (priority 100)
The forward direction uses `createsGSplitCoequalizersOfMonadic` (resp. `createsFSplitEqualizersOfComonadic`). The backward direction is `monadicOfHasPreservesGSplitCoequalizersOfReflectsIsomorphisms` (resp. its dual). The module docstrings list the new statements.
Mathlib has the backward direction as the definitions `monadicOfHasPreservesGSplitCoequalizersOfReflectsIsomorphisms` and `comonadicOfHasPreservesFSplitEqualizersOfReflectsIsomorphisms`, and the forward ingredients `createsGSplitCoequalizersOfMonadic` and `createsFSplitEqualizersOfComonadic`, but no iff.
Questions for reviewers: whether the instances belong in `Monad/Adjunction.lean` next to `MonadicRightAdjoint`; whether to state the iff with the existing classes `HasCoequalizerOfIsSplitPair` / `PreservesColimitOfIsSplitPair` instead of the explicit `∀`.
AI disclosure: the Lean proof was written by an AI model (Claude, Anthropic) under my direction. I have read and checked it and will handle the review. It builds against current master.
|
new-contributor
t-category-theory
LLM-generated
|
55/0 |
Mathlib/CategoryTheory/Monad/Comonadicity.lean,Mathlib/CategoryTheory/Monad/Monadicity.lean |
2 |
2 |
['github-actions'] |
robin-carlier assignee:robin-carlier |
0-49651 13 hours ago |
5-61368 5 days ago |
5-61361 5 days |
0 |
| 44726 |
mycaule author:mycaule |
feat(CategoryTheory/Idempotents/FunctorExtension): additive functors on the Karoubi envelope |
Add to `Mathlib/CategoryTheory/Idempotents/FunctorExtension.lean`:
`Karoubi.hom_eq_decompId_i_comp`: every morphism of `Karoubi C` is `P.decompId_i ≫ (toKaroubi C).map f.f ≫ Q.decompId_p`
`additive_of_toKaroubi_comp`, `additive_iff_toKaroubi_comp`: for `C`, `D` preadditive, `F : Karoubi C ⥤ D` is additive iff `toKaroubi C ⋙ F` is
`whiskeringLeftToKaroubiAdditive C D : (Karoubi C ⥤+ D) ⥤ (C ⥤+ D)`, fully faithful (`whiskeringLeftToKaroubiAdditiveFullyFaithful`), and an equivalence when `D` is idempotent complete
`karoubiUniversalAdditive C D : C ⥤+ D ≌ Karoubi C ⥤+ D`
This is the additive form of the universal property of the idempotent completion. Applied to `Cᵒᵖ`, it says that additive presheaves on `C` and on `Karoubi C` agree (Morita invariance), with values in any idempotent-complete preadditive category, e.g. `ModuleCat R`.
Mathlib has `karoubiUniversal C D : (C ⥤ D) ≌ (Karoubi C ⥤ D)` for idempotent-complete `D`, but not its restriction to additive functors.
Questions for reviewers: names (`whiskeringLeftToKaroubiAdditive`, `karoubiUniversalAdditive`); whether to also add `Karoubi.opEquivalence : Karoubi Cᵒᵖ ≌ (Karoubi C)ᵒᵖ` (compatible with `toKaroubi` on the nose) here or in a separate PR.
AI disclosure: the Lean proof was written by an AI model (Claude, Anthropic) under my direction. I have read and checked it and will handle the review. It builds against current master.
|
new-contributor
t-category-theory
LLM-generated
|
67/0 |
Mathlib/CategoryTheory/Idempotents/FunctorExtension.lean |
1 |
2 |
['github-actions'] |
dagurtomas assignee:dagurtomas |
0-49599 13 hours ago |
5-61328 5 days ago |
5-61321 5 days |
0 |
| 44941 |
CollinYuanjieRen author:CollinYuanjieRen |
feat(Data/Finset/Sort): add filtering and greatest insertion lemmas |
Prove that filtering commutes with `Finset.sort`, and that inserting a new greatest element appends it to the sorted list. Both lemmas work for general total, transitive, antisymmetric relations.
Continues the sorting portion of #9605 by @davikrehalt.
Codex (GPT-6 Astra) assisted with the Lean proofs.
|
t-data
LLM-generated
new-contributor
|
13/0 |
Mathlib/Data/Finset/Sort.lean |
1 |
3 |
['CollinYuanjieRen', 'github-actions'] |
nobody |
0-47935 13 hours ago |
0-49537 13 hours ago |
0-49530 13 hours |
0 |
| 44776 |
keithadler author:keithadler |
chore: use `Type*` in a few more places |
`Representation.norm_ofMulDistribMulAction_eq`, `Matrix.dualNumberEquiv` and `ValuativeRel.trivialRel` (with the lemmas about it) were stated for `Type`, although the definitions they use work in any universe. This uses `Type*`.
---
#44466 (an experiment) edits the `variable` line in `DualNumber.lean` as well.
Found with [lean-linter](https://github.com/keithadler/lean-linter). Prepared with AI assistance (Claude); I checked the change and the build.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
t-ring-theory
LLM-generated
new-contributor
maintainer-merge
|
2/2 |
Mathlib/RingTheory/Valuation/ValuativeRel/Trivial.lean |
1 |
11 |
['JX-Mo', 'Whysoserioushah', 'github-actions', 'grunweg', 'keithadler', 'mathlib-splicebot', 'tb65536'] |
nobody |
0-46254 12 hours ago |
5-36457 5 days ago |
5-36450 5 days |
0 |
| 44801 |
keithadler author:keithadler |
chore(LinearAlgebra/RootSystem/WeylGroup): prove the three range lemmas from one |
`range_weylGroup_weightHom`, `range_weylGroup_coweightHom` and `range_weylGroupToPerm` each proved the same fact with their own ~20-line `Subgroup.closure_induction''` argument, differing only in the homomorphism and the simp lemma. This adds `range_weylGroup_domRestrict`, which says the image of the Weyl group under any homomorphism sending each reflection `i` to `g i` is `Subgroup.closure (range g)`, and proves the three from it. Their statements are unchanged and nothing else in Mathlib uses them. The file is 56 lines shorter, and `set_option backward.isDefEq.respectTransparency false` is no longer needed.
--------
The module builds and `lake exe runLinter` passes on it.
Found with [Lean Studio](https://github.com/keithadler/leanstudio)'s Find Similar Proofs. Prepared with AI assistance (Claude); I checked the change and the build.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
|
tech debt
t-algebra
LLM-generated
new-contributor
maintainer-merge
label:t-algebra$ |
15/72 |
Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean |
1 |
27 |
['Hagb', 'adomani', 'github-actions', 'grunweg', 'keithadler', 'themathqueen'] |
nobody |
0-42097 11 hours ago |
2-33011 2 days ago |
3-50645 3 days |
0 |
| 44853 |
dkaysin author:dkaysin |
feat(Geometry/Group): relate the word metric to the Cayley graph distance |
This PR constructs the Cayley graph (realized as a `SimpleGraph`) for a group `G` with respect to a generating family `P : Group.Generators G ι`, implements the link between walks in the Cayley graph and words, and establishes equivalence of the word metric and the distance on the Cayley graph.
---
Resolves TODO from [#43118](https://github.com/leanprover-community/mathlib4/pull/43118).
Implementation details:
* `SimpleGraph` was chosen vs `Quiver/Schreier` because it has a more comprehensive API at the moment. More context: [Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Relate.20the.20word.20metric.20to.20the.20distance.20in.20the.20Cayley.20graph/with/631376709).
* To accommodate possible future implementation for `Quiver/Schreier`, I've included "Simple" in the names of definitions and theorems (e.g., `cayleySimpleGraph`).
* Because simple graph has no loops, in several places we have to check that a letter/generator is not trivial.
Use of AI: I used Claude Opus 5.5 to help me with gathering context, designing API and implementation of several proofs.
* I used AI to brainstorm and compare API design ideas based on the context from previous Zulip threads and existing repo code.
* I used AI for suggesting parts of the proofs for `exists_walk_of_word` and `exists_word_of_walk` lemmas.
* I used AI for checking docstrings for consistency.
All AI-generated content was reviewed and edited by me.
<!-- Your PR title will become the first line of the commit message.
In this box, the text above the `---` (if not empty) will be appended
to the commit message, and can be used to give additional context or
details. Please leave a blank newline before the `---`, otherwise GitHub
will format the text above it as a title.
For details on the "pull request lifecycle" in mathlib, please see:
https://leanprover-community.github.io/contribute/index.html
In particular, note that most reviewers will only notice your PR
if it passes the continuous integration checks.
Please ask for help on https://leanprover.zulipchat.com if needed.
When merging, all the commits will be squashed into a single commit
listing all co-authors.
Co-authors in the squash commit are gathered from two sources:
First, all authors of commits to this PR branch are included. Thus,
one way to add co-authors is to include at least one commit authored by
each co-author among the commits in the pull request. If necessary, you
may create empty commits to indicate co-authorship, using commands like so:
git commit --author="Author Name <author@email.com>" --allow-empty -m "add Author Name as coauthor"
Second, co-authors can also be listed in lines at the very bottom of
the commit message (that is, directly before the `---`) using the following format:
Co-authored-by: Author Name <author@email.com>
If you are moving or deleting declarations, please include these lines
at the bottom of the commit message (before the `---`, and also before
any "Co-authored-by" lines) using the following format:
Moves:
- Vector.* -> List.Vector.*
- ...
Deletions:
- Nat.bit1_add_bit1
- ...
Any other comments you want to keep out of the PR commit should go
below the `---`, and placed outside this HTML comment, or else they
will be invisible to reviewers.
If this PR depends on other PRs, please list them below this comment,
using the following format:
- [ ] depends on: #abc [optional extra text]
- [ ] depends on: #xyz [optional extra text]
-->
|
t-geometric-group-theory
new-contributor
LLM-generated
|
156/3 |
Mathlib.lean,Mathlib/Geometry/Group/CayleySimpleGraph.lean,Mathlib/Geometry/Group/README.md,Mathlib/Geometry/Group/WordMetric.lean |
4 |
4 |
['github-actions', 'tb65536'] |
nobody |
0-39546 10 hours ago |
2-63476 2 days ago |
2-63469 2 days |
0 |
| 44893 |
unknown8575 author:unknown8575 |
chore(Topology/MetricSpace/Polish): generalize `IsClopenable.iUnion` to countable index types |
The proof only used ℕ to get `t' ≤ t` through index 0, but `exists_polishSpace_forall_le` already gives this directly. So the lemma now works for any countable index type, and the TODO is removed.
I used an LLM to find this TODO and draft the change. I've checked it, built it locally, and understand every line. |
t-topology
new-contributor
|
18/15 |
Mathlib/Topology/MetricSpace/Polish.lean |
1 |
5 |
['github-actions', 'plp127', 'unknown8575', 'vihdzp'] |
nobody |
0-36773 10 hours ago |
1-55854 1 day ago |
1-55847 1 day |
0 |
| 42914 |
lman310 author:lman310 |
feat(Algebra): add zpow_right_injective |
Add IsMulTorsionFree.zpow_right_injective_iff, its injectivity alias, and the _inj version, together with their additive counterparts via to_additive.
Move the natural power injectivity lemmas from Mathlib.Algebra.Ring.NonZeroDivisors to Mathlib.Algebra.Group.Torsion and add their additive counterparts via to_additive.
Use natural scalar injectivity to move CharZero.of_hasUniqueDiv and its deprecated alias CharZero.of_isAddTorsionFree from Mathlib.Algebra.Module.Torsion.Free to Mathlib.Algebra.Module.NatInt, weakening AddCommGroup M to AddCancelCommMonoid M.
---
Codex was used to find the appropriate file `Mathlib.Algebra.Module.NatInt` for moving `CharZero.of_isAddTorsionFree`
---
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|
t-algebra
new-contributor
maintainer-merge
label:t-algebra$ |
48/24 |
Mathlib/Algebra/Group/Torsion.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Module/Torsion/Free.lean,Mathlib/Algebra/Ring/NonZeroDivisors.lean |
4 |
24 |
['felixpernegger', 'github-actions', 'lman310', 'mathlib-merge-conflicts', 'themathqueen'] |
nobody |
0-34598 9 hours ago |
0-43788 12 hours ago |
46-43057 46 days |
0 |
| 43758 |
joelcanary author:joelcanary |
feat(NumberTheory/ArithmeticFunction): the Redheffer determinant equals the Mertens function |
This PR adds the zeta (divisibility) matrix, the Redheffer matrix and the Mertens function, and proves **Redheffer's theorem** (1977): the determinant of the `(n+1) × (n+1)` Redheffer matrix equals the Mertens function `M(n+1) = ∑_{k ≤ n+1} μ(k)`.
In `Mathlib/NumberTheory/ArithmeticFunction/Moebius.lean`:
- `ArithmeticFunction.sum_divisors_moebius (k) : ∑ d ∈ k.divisors, μ d = if k = 1 then 1 else 0`, the pointwise form of `moebius_mul_coe_zeta`.
New file `Mathlib/NumberTheory/ArithmeticFunction/Redheffer.lean`:
- `ArithmeticFunction.mertens : ArithmeticFunction ℤ`, the summatory function of `μ`, with `mertens_apply : mertens n = ∑ k ∈ Icc 1 n, μ k`, `mertens_one`, `mertens_add_one` and `mertens_eq_sum_fin` (the `0`-based form `∑ i : Fin n, μ (i + 1)` used on the matrix side);
- `Matrix.zetaMatrix R n : Matrix (Fin n) (Fin n) R` for any `R` with `0` and `1` (entry `1` iff `i + 1 ∣ j + 1`), with `zetaMatrix_apply` (simp), `zetaMatrix_isUpperTriangular` and, for `CommRing R`, `det_zetaMatrix : det = 1` and `det_zetaMatrix_updateCol : det (updateCol 0 u) = ∑ j, μ (j + 1) * u j` (the first row of the inverse is `(μ 1, …, μ n)`);
- `Matrix.redheffer R n` (the zeta matrix with its first column set to ones), with `redheffer_apply` (simp) and `redheffer_eq_updateCol`;
- `Matrix.det_redheffer (n) : (redheffer R (n + 1)).det = mertens (n + 1)` for any `CommRing R` (with `mertens` cast into `R`).
The remaining declarations (the row vector `(μ 1, …, μ n)`, the reindexing of a `Fin n`-sum over divisibility as a sum over `m.divisors`, and three intermediate steps) are `private`: they are proof scaffolding, not API.
Proof sketch: by linearity of `det` in the first column, `det (redheffer R (n+1)) = det (zetaMatrix R (n+1)) + det (zetaMatrix with first column (0,1,…,1))`. The first term is `1`; by Cramer's rule (`det_smul_inv_mulVec_eq_cramer`) the second is the first row of the inverse of the zeta matrix dotted with `(0,1,…,1)`, and that row is `(μ 1, …, μ (n+1))` because `μ * ζ = 1` (`moebius_mul_coe_zeta`, via `sum_divisors_moebius`). The remaining sum `μ 2 + ⋯ + μ (n+1)` is `mertens (n+1) - 1`.
The ring `R` is an explicit argument of `zetaMatrix` and `redheffer` since nothing else determines it. Neither the Mertens function nor the Redheffer matrix currently appear in Mathlib. The new file imports only `LinearAlgebra.Matrix.Block` and `NumberTheory.ArithmeticFunction.Moebius`. References added to `docs/references.bib`: `redheffer1977` (the theorem) and `odlyzko1985` (cited in the module docstring for the disproof of the Mertens conjecture).
AI use: the Lean code and this description were written with an AI agent (Claude) under my direction, from a proof in my own project; I reviewed every declaration, and the branch was checked locally with `lake build`, `lake exe lint-style` and `lake exe runLinter` before each push.
|
t-number-theory
new-contributor
LLM-generated
|
238/0 |
Mathlib.lean,Mathlib/NumberTheory/ArithmeticFunction/Moebius.lean,Mathlib/NumberTheory/ArithmeticFunction/Redheffer.lean,docs/references.bib |
4 |
15 |
['Parcly-Taxel', 'github-actions', 'joelcanary', 'wwylele'] |
MichaelStollBayreuth assignee:MichaelStollBayreuth |
0-32193 8 hours ago |
28-55836 28 days ago |
34-29836 34 days |
2 |
| 44598 |
kirill-kondrashov author:kirill-kondrashov |
feat(LinearAlgebra/ExteriorPower): add API for HodgeStar |
---
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[](https://gitpod.io/from-referrer/)
This is a follow-up of the https://github.com/leanprover-community/mathlib4/pull/43140 which stated a few TODO points.
This PR implements the first TODO point
* Add API to obviate the need to supply the volume element in the presence of `Module.Oriented`.
GPT 6 Luna Max was used for initial brainstorming (as well as Mathlib API investigation on the existing relevant constructions), mainly overwritten and refactored manually. |
t-algebra
LLM-generated
new-contributor
label:t-algebra$ |
23/1 |
Mathlib/LinearAlgebra/ExteriorPower/HodgeStar.lean |
1 |
7 |
['github-actions', 'kirill-kondrashov', 'themathqueen'] |
nobody |
0-29025 8 hours ago |
8-51904 8 days ago |
8-54642 8 days |
0 |
| 44829 |
pelicanhere author:pelicanhere |
refactor(Analysis/Normed): generalize scalar distance and diameter lemmas |
Generalize scalar distance and diameter lemmas to `NormedRing`, and drop the nonzero assumption from `infDist_smul₀`.
|
t-analysis
new-contributor
|
21/27 |
Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/Analysis/Normed/Module/Ball/Pointwise.lean |
2 |
5 |
['github-actions', 'leanprover-radar', 'pelicanhere', 'tb65536'] |
nobody |
0-28767 7 hours ago |
3-38263 3 days ago |
3-38256 3 days |
0 |
| 44757 |
mycaule author:mycaule |
feat(LinearAlgebra/ExteriorPower/Basis): the Cauchy–Binet formula |
Add to `Mathlib/LinearAlgebra/ExteriorPower/Basis.lean`, for matrices over a commutative ring with `ι` finite and linearly ordered:
`Matrix.det_mul_eq_sum_powersetCard`: for `A : Matrix (Fin n) ι R` and `B : Matrix ι (Fin n) R`, `det (A * B) = ∑ s : powersetCard ι n, det (A.submatrix id s) * det (B.submatrix s id)`, each `s` enumerated in increasing order (`powersetCard.ofFinEmbEquiv.symm s`)
`Matrix.det_submatrix_mul`: the same for the minors of `A * B` on rows `I : Fin n → l` and columns `K : Fin n → o`.
---
Mathlib has `det_mul` for square matrices but no Cauchy–Binet formula. #40473 and #44209 (both closed) proved it by direct computation with permutations, and the review of #40473 pointed to exterior powers instead. Here the square case applies `exteriorPower.pairingDual` to the expansion of `ιMulti R n (rows of A)` in `Module.Basis.exteriorPower` (`Basis.sum_repr`); the minors version follows from it through `Matrix.submatrix_mul`.
Questions for reviewers: the names; whether the sum should be over `Fin n ↪o ι` instead of `powersetCard ι n`.
AI disclosure: the Lean proof was written by an AI model (Claude, Anthropic) under my direction, with the proof of the square case suggested in review. I have read and checked it and will handle the review.
|
t-algebra
new-contributor
LLM-generated
label:t-algebra$ |
29/0 |
Mathlib/LinearAlgebra/ExteriorPower/Basis.lean |
1 |
15 |
['github-actions', 'mycaule', 'themathqueen'] |
nobody |
0-22719 6 hours ago |
2-28930 2 days ago |
5-44745 5 days |
0 |
| 44945 |
CollinYuanjieRen author:CollinYuanjieRen |
chore(Algebra/Lie): generalize subalgebra map membership |
Generalize `LieSubalgebra.mem_map_submodule` to arbitrary Lie algebra morphisms. Add `mem_map_equiv` and update the three skew-adjoint equivalence proofs.
Continues Eric Rodriguez Boidi's #7994, marked `please-adopt`.
---
Checked the five affected modules with Lean 4.36.0-rc1 and a zero-morphism client regression.
AI-assisted: Codex prepared the Lean changes; GPT-6 Astra assisted with proof checks.
|
t-algebra
LLM-generated
new-contributor
label:t-algebra$ |
9/6 |
Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Subalgebra.lean |
2 |
3 |
['CollinYuanjieRen', 'github-actions'] |
nobody |
0-18703 5 hours ago |
0-19470 5 hours ago |
0-19463 5 hours |
0 |
| 39212 |
emlis42 author:emlis42 |
feat(Algebra/ContinuedFractions): add `partNumsStream'` and `partNumsStream'` |
This PR adds `partNumsStream'` and `partDensStream'`, which provide infinite stream representations for the sequences of partial numerators and denominators of a generalized continued fraction. |
t-algebra
new-contributor
label:t-algebra$ |
68/36 |
Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/ContinuedFractions/ContinuantsRecurrence.lean,Mathlib/Algebra/ContinuedFractions/Determinant.lean,Mathlib/Algebra/ContinuedFractions/Euler.lean,Mathlib/Algebra/ContinuedFractions/Translations.lean |
5 |
7 |
['emlis42', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-merge-conflicts'] |
YaelDillies assignee:YaelDillies |
0-6101 1 hour ago |
22-38519 22 days ago |
156-45756 156 days |
0 |
| 42046 |
LegaSage author:LegaSage |
feat(Polynomial): add Wronskian linear dependence lemmas |
This extends the polynomial Wronskian API of Baek and Lee from the existing coprime case to arbitrary polynomials over a characteristic-zero field.
It adds:
* an explicit nontrivial scalar relation for any pair with zero Wronskian, including zero-polynomial edge cases;
* scalar-multiple corollaries when either polynomial is nonzero;
* the weighted derivative corollary that solutions of `a * f' - n * a' * f = 0` are scalar multiples of `a ^ n` when `a ≠ 0`.
The proof factors out the polynomial gcd and applies the existing `IsCoprime.wronskian_eq_zero_iff` theorem. This PR makes no novelty claim; it packages standard consequences of the existing Baek–Lee coprime Wronskian API.
-------
The implementation was prepared with assistance from OpenAI Codex and reviewed and submitted by LegaSage.
|
t-ring-theory
new-contributor
large-import
LLM-generated
|
96/1 |
Mathlib/RingTheory/Polynomial/Wronskian.lean |
1 |
2 |
['github-actions'] |
mattrobball assignee:mattrobball |
0-6097 1 hour ago |
85-3886 85 days ago |
85-3879 85 days |
0 |
| 42110 |
Zeta-Wu author:Zeta-Wu |
feat: add path length for paths in pseudo emetric spaces |
This PR defines the length of a path in a `PseudoEMetricSpace` as its variation on the unit interval.
It proves the basic properties of path length:
- the endpoint distance is bounded by the length;
- the constant path has length zero;
- reversing a path preserves its length;
- concatenating two paths adds their lengths.
Main declarations:
- `Path.length`
- `Path.edist_le_length`
- `Path.length_refl`
- `Path.length_symm`
- `Path.length_trans`
This is intended as a first step toward a broader theory of rectifiable paths, including later results on invariance of length under monotone reparametrization, and shortest paths are line segments up to monotone reparametrization in strict convex spaces.
This PR was discussed on Zulip [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/PR.20.2342110.3A.20Path.2Elength.20in.20PseudoEMetricSpace).
AI disclosure: I used an agent called ReasLingo to generate those codes. After the codes are generated I read them line by line and ask the agent to rewrite some proofs when I think it is a bad code. For design decisions, I asked the agent to give me several versions, and I manually picked one of them to make sure it fits human understanding.
---
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-->
[](https://gitpod.io/from-referrer/)
|
t-topology
new-contributor
LLM-generated
|
231/0 |
Mathlib.lean,Mathlib/Topology/EMetricSpace/ArcLength.lean,Mathlib/Topology/EMetricSpace/PathLength.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/UnitInterval.lean |
5 |
129 |
['CoolRmal', 'SnirBroshi', 'Zeta-Wu', 'felixpernegger', 'github-actions', 'pelicanhere', 'scholzhannah'] |
ADedecker assignee:ADedecker |
0-6096 1 hour ago |
30-46742 30 days ago |
70-72328 70 days |
0 |
| 42487 |
bocowgill author:bocowgill |
feat(Algebra/BigOperators/Group/Finset/Powerset): add nested powersetCard identities |
This PR adds product and sum identities for nested collections of fixed-cardinality subsets. For `r ≤ k`, each `r`-element subset of a finite set `s` is contained in exactly
`Nat.choose (s.card - r) (k - r)`
of the `k`-element subsets of `s`. Thus, a sum over the `r`-element subsets of every `k`-element subset reduces to this multiplicity, times a single sum over `s.powersetCard r`. The product version is the analogous power identity.
The proof exchanges the order of the two big operators using `Finset.prod_comm'`. It then counts each fiber with `Finset.card_filter_powersetCard_subset`. The additive identities are generated with `to_additive`. The PR also provides the useful elementwise specialization `r = 1`.
**Motivation**: These results provide reusable weighted double-counting tools for finite combinatorics. They are useful in arguments about uniform set systems, incidence relations, and sums or products over fixed-cardinality subsets.
---
### LLM disclosure
For theorem planning and Lean implementation, I used OpenAI Codex substantially. I also used Codex to search Mathlib and open PRs for related results, suggest naming and documentation, iterate on the proofs, audit import dependencies, and validate the commits locally.
I personally reviewed the mathematical statements and Lean code line-by-line, including the naming and API choices. I also confirmed that I can explain each step of the proofs.
For the current revision, I ran a targeted build of `Mathlib.Algebra.BigOperators.Group.Finset.Powerset`, the style and environment linters, and `git diff --check`. I also inspected the generated additive declarations and axiom dependencies, and tested an alternative proof using explicit incidence finsets. The complete GitHub CI suite passes.
This is one of my earliest Mathlib contributions. I welcome corrections and suggestions, and I am prepared to revise the PR and learn from the review. |
t-algebra
new-contributor
LLM-generated
label:t-algebra$ |
27/0 |
Mathlib/Algebra/BigOperators/Group/Finset/Powerset.lean |
1 |
17 |
['bocowgill', 'github-actions', 'pepamontero'] |
eric-wieser assignee:eric-wieser |
0-6095 1 hour ago |
32-84733 32 days ago |
71-26683 71 days |
0 |
| 40953 |
ymonbru author:ymonbru |
feat: the definition of a KSheaf on a T2 Space |
This files adds the definition of a KSheaf on a T2 space with value in an arbitrary category.
One may expect this notion to come from sheaves on a site of compact subset of a topological space but there is no coresponding Grothendieck topology on compact subsets. In particular, this is because one of the axioms is in the form of a colimit and can't be expressed as a limit condition (hence a sheaf condition).
It also adds API that allow to use the axioms in a convenient way.
---
- [x] depends on: #40737
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-->
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-topology
|
137/0 |
Mathlib.lean,Mathlib/Topology/Sheaves/KSheaf.lean |
2 |
26 |
['Multramate', 'github-actions', 'joelriou', 'mathlib-dependent-issues', 'ymonbru'] |
nobody |
0-5200 1 hour ago |
21-18369 21 days ago |
102-55842 102 days |
1 |
| 40368 |
Sanghyeok0 author:Sanghyeok0 |
feat: add confluence predicates for relations |
This PR adds a minimal relation-level API for confluence-style properties:
* `Relation.IsDiamond`
* `Relation.IsConfluent`
* `Relation.IsChurchRosser`
It also adds the basic API connecting these predicates:
* `Relation.ReflTransGen.to_eqvGen`
* `Relation.Join.le_eqvGen`
* `Relation.IsChurchRosser.isConfluent`
* `Relation.IsConfluent.isChurchRosser`
* `Relation.IsChurchRosser.join_reflTransGen_eq_eqvGen`
The main downstream application is the polynomial-reduction development in
#41475. There, polynomial reduction is treated as an ordinary relation on
`MvPolynomial`, and these predicates are used to formulate confluence and the
Church--Rosser property.
A more general rewriting API exists in CSLib. This PR does not attempt to
upstream that API wholesale; its scope is intentionally limited to the
declarations needed by the downstream polynomial application.
The earlier version of this PR also introduced
`Relation.StronglyConfluent` and additional equivalence packaging. Those
declarations have been removed to keep this PR small and application-driven.
Reference: Becker, Weispfenning, and Kredel,
*Gröbner Bases: A Computational Approach to Commutative Algebra*.
AI usage disclosure:
I used OpenAI Codex to generate initial drafts of the definitions, theorem statements, proof scripts, and docstrings. I made the final decisions on the mathematical scope and API design, reviewed the generated code and final changes, and made a few edits to statements and docstrings.
---
<!-- Your PR title will become the first line of the commit message.
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t-logic
new-contributor
tech debt
LLM-generated
|
103/25 |
Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/Logic/Relation.lean |
2 |
36 |
['Sanghyeok0', 'SnirBroshi', 'chenson2018', 'github-actions', 'mathlib-merge-conflicts'] |
nobody |
0-5199 1 hour ago |
40-23584 40 days ago |
112-13492 112 days |
1 |
| 42142 |
philipp-svinger author:philipp-svinger |
feat(Analysis/ODE): peano existence theorem, Tonelli approximation 1 |
Add Tonelli approximation method for ODEs.
Implement the structure IsPeano similar to IsPicardLindelof. Construct a sequence of approximations using Tonelli technique.
First step towards Peano existence
Co-authored-by: Florian Grube <fgrube@math.uni-bielefeld.de>
Co-authored-by: Paul Niessner <pniessner@math.uni-bielefeld.de>
Co-authored-by: Julian Rolfes <jrolfes@math.uni-bielefeld.de>
Co-authored-by: Luke Schleef <lschleef@math.uni-bielefeld.de>
Co-authored-by: Philipp Svinger <psvinger@math.uni-bielefeld.de>
---
We want to add the proof of the Peano existence theorem for ODEs, using Tonelli approximations.
This will be a series of PRs working towards this goal. In this first PR, we
implement the structure IsPeano similar to IsPicardLindelof and construct a sequence of approximations using Tonelli technique. See our further PRs for more information, last: #42148
---
The statements, definitions and proofs were written without AI.
AI was used afterwards to help us to adapt our code to the style and naming conventions.
We also used it in the process of writing a documentation.
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|
t-analysis
new-contributor
|
207/0 |
Mathlib.lean,Mathlib/Analysis/ODE/Peano.lean |
2 |
24 |
['github-actions', 'mcdoll', 'philipp-svinger', 'sgouezel'] |
nobody |
0-5195 1 hour ago |
21-24534 21 days ago |
77-73964 77 days |
5 |
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