Would you like to help out at a PR, differently from reviewing? Here are some ideas:
| 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 |
| 8961 |
eric-wieser author:eric-wieser |
refactor: use the coinduced topology on ULift |
---
- [x] depends on: #8958
[](https://gitpod.io/from-referrer/)
|
please-adopt
merge-conflict
awaiting-author
awaiting-CI
|
46/14 |
Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/Constructions.lean |
3 |
6 |
['eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot', 'urkud'] |
nobody |
553-13502 1 year ago |
unknown |
unknown |
| 9642 |
eric-wieser author:eric-wieser |
refactor(Analysis/Normed/{Group/Field}/Basic): Let `extends` generate the repeated fields |
New-style structure shenanigans mean that instance constructors randomly complain about a missing field that can be found with `__ : MetricSpace _ := infer_instance`.
---
[](https://gitpod.io/from-referrer/)
I will write a longer PR description for this once CI is happy
|
WIP
merge-conflict
awaiting-author
help-wanted
t-analysis
|
122/202 |
Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Completion.lean,Mathlib/Analysis/Normed/Order/Basic.lean,Mathlib/Analysis/NormedSpace/ProdLp.lean,Mathlib/Analysis/NormedSpace/Star/Matrix.lean,Mathlib/Analysis/NormedSpace/Unitization.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/InformationTheory/Hamming.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean |
17 |
11 |
['eric-wieser', 'leanprover-bot', 'urkud'] |
nobody |
553-13502 1 year ago |
unknown |
unknown |
| 6791 |
eric-wieser author:eric-wieser |
refactor: Use flat structures for morphisms |
This restores the symmetry we had in Lean3, where we had `MonoidHom.mk f one mul` not `MonoidHom.mk (OneHom.mk f one) mul`, and `f.toFun` wasn't notation for `f.toMulHom.toFun`.
The nesting provided by the previous inheritance is useless to us in the face of `MonoidHomClass.toMonoidHom`, which completely eta-expands the structure anyway.
We call the class `FunLikeFlatHack._` because this means the field is called `to_` which uses up less space in the goal view than any alternative.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
help-wanted
awaiting-CI
|
174/201 |
Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Category/GroupCat/ZModuleEquivalence.lean,Mathlib/Algebra/Category/GroupWithZeroCat.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/Hom/Equiv/Basic.lean,Mathlib/Algebra/Hom/Group/Defs.lean,Mathlib/Algebra/Hom/GroupAction.lean,Mathlib/Algebra/Hom/NonUnitalAlg.lean,Mathlib/Algebra/Hom/Ring/Defs.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Module/Equiv.lean,Mathlib/Algebra/Module/LinearMap.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Algebra/Order/Interval.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Analysis/Normed/Group/SemiNormedGroupCat.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/Rat/Cast/CharZero.lean,Mathlib/Data/Real/EReal.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/LinearAlgebra/Quotient.lean,Mathlib/LinearAlgebra/TensorProduct.lean,Mathlib/RingTheory/RingInvo.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/MetricSpace/Dilation.lean |
32 |
0 |
[] |
nobody |
553-13501 1 year ago |
unknown |
unknown |
| 6931 |
urkud author:urkud |
refactor(Analysis/Normed*): use `RingHomIsometric` for `*.norm_cast` |
---
I don't understand why linter fails.
[](https://gitpod.io/from-referrer/)
|
merge-conflict
help-wanted
t-analysis
|
78/68 |
Mathlib/Analysis/LocallyConvex/ContinuousOfBounded.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/NormedSpace/Basic.lean,Mathlib/Analysis/NormedSpace/Exponential.lean,Mathlib/Analysis/NormedSpace/Spectrum.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean |
8 |
0 |
[] |
nobody |
553-13501 1 year ago |
unknown |
unknown |
| 7903 |
urkud author:urkud |
feat: define `UnboundedSpace` |
---
The new instances generate some timeouts, and I don't understand why.
[](https://gitpod.io/from-referrer/)
|
merge-conflict
help-wanted
t-topology
|
111/59 |
Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Topology/Bornology/Basic.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/GromovHausdorffRealized.lean |
6 |
1 |
['github-actions'] |
nobody |
546-1478 1 year ago |
unknown |
unknown |
| 9973 |
Ruben-VandeVelde author:Ruben-VandeVelde |
feat: polynomials formed by lists |
From https://github.com/leanprover-community/mathlib/pull/15476
---
[](https://gitpod.io/from-referrer/)
|
please-adopt
merge-conflict
t-data
|
311/0 |
Mathlib.lean,Mathlib/Data/Polynomial/OfList.lean |
2 |
0 |
[] |
nobody |
539-6578 1 year ago |
unknown |
unknown |
| 9444 |
erdOne author:erdOne |
feat: Various instances regarding `𝓞 K`. |
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
help-wanted
t-number-theory
|
27/0 |
Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/RingTheory/IntegralClosure.lean |
2 |
9 |
['erdOne', 'leanprover-bot', 'mattrobball', 'riccardobrasca', 'xroblot'] |
nobody |
538-3254 1 year ago |
unknown |
unknown |
| 9605 |
davikrehalt author:davikrehalt |
feat(Data/Finset & List): Add Lemmas for Sorting and Filtering |
This PR includes several useful lemmas to the Data/Finset and Data/List modules in Lean's mathlib:
1. `toFinset_filter` (List): Shows that filtering commutes with toFinset.
2. `toFinset_is_singleton_implies_replicate` (List): Shows a list with a singleton toFinset is a List.replicate.
3. `filter_sort_commute` (Finset): Sorting and filtering can be interchanged in Finsets.
4. `Sorted.filter` (List): A sorted list stays sorted after filtering.
5. `Sorted.append_largest` (List): Appending the largest element keeps a list sorted.
6. `sort_monotone_map` (Finset): Relates sorting of a Finset after mapping to sorting of a list.
7. `sort_insert_largest` (Finset): Sorting a Finset with an inserted largest element.
8. `sort_range` (Finset): Sorting a range in a Finset equals the corresponding range list.
9. ~~`filter_eval_true` (List): Filtering a list with a predicate always true keeps the list unchanged.~~
10. ~~`filter_eval_false` (List): Filtering with an always-false predicate gives an empty list.~~
11. ~~`pairwise_concat` (List): Iff condition for Pairwise relation in concatenated lists (similar to pairwise_join).~~
12. `list_map_toFinset` (Finset): toFinset commutes with map under injection
---
- [x] depends on: #15952
This is my first PR to mathlib, so I'm not too familiar with etiquette's and more specifically there are two proofs in the PR which uses aesop, and I am not sure if it's frowned upon. I kept the aesop in there for now as I couldn't construct very short proofs otherwise. The sort_range function proof was suggested in https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Computing.20Finset.20sort.20of.20Finset.20range/near/410346731 by Ruben Van de Velde. Thanks for your time for improving this PR. |
please-adopt
t-data
new-contributor
merge-conflict
awaiting-author
|
71/0 |
Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Sort.lean |
4 |
30 |
['YaelDillies', 'davikrehalt', 'eric-wieser', 'github-actions', 'jcommelin', 'leanprover-community-mathlib4-bot', 'urkud', 'vihdzp'] |
YaelDillies assignee:YaelDillies |
461-53041 1 year ago |
unknown |
unknown |
| 20656 |
Komyyy author:Komyyy |
feat(Mathlib/Geometry/Manifold/VectorBundle/Sphere): convert orthogonal smooth `M → 𝕊ⁿ` & `M → ℝⁿ⁺¹` to smooth `M → T𝕊ⁿ` |
Current Mathlib has no easy way to define function from a manifold to tangent bundles of sphere: `T𝕊ⁿ`.
This PR gives this: `sphereTangentMap`. This convert orthogonal smooth `M → 𝕊ⁿ` & `M → ℝⁿ⁺¹` to smooth `M → T𝕊ⁿ`.
I also proved that if `f : M → 𝕊ⁿ` & `g : M → ℝⁿ⁺¹` are smooth then `sphereTangentMap` of `f` & `g` is smooth too.
---
⚠ **CAUTION**
I formalized this in my spare time.
I don't have the energy to maintain the PR, but I create this PR so this may helps everyone.
The only one thing to do is proof cleanup.
TODO:
- [x] `contDiff_uncurry_stereoInvFunAux` & `coe_sphere_comp_stereoInvFun` may have to be moved to `Mathlib.Geometry.Manifold.Instances.Sphere`.
- [ ] Proof cleanup. Current proof may be redundant and ugly.
[](https://gitpod.io/from-referrer/)
|
please-adopt
merge-conflict
t-differential-geometry
|
246/6 |
Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/VectorBundle/Sphere.lean |
3 |
1 |
['github-actions'] |
nobody |
384-11278 1 year ago |
unknown |
unknown |
| 11837 |
trivial1711 author:trivial1711 |
feat: completion of a uniform multiplicative group |
Multiplicativize `Topology.Algebra.GroupCompletion`. That is, rewrite it in the multiplicative setting and recover the original results using `@[to_additive]`.
- Because `@[to_additive]` doesn't work with `noncomputable section` (https://github.com/leanprover/lean4/pull/2610), some instances with `@[to_additive]` need to be explicitly marked with `noncomputable instance`.
- One might be tempted to multiplicativize this definition from `Topology.Algebra.GroupCompletion`:
```lean
instance [UniformSpace α] [Add α] : Add (Completion α) :=
⟨Completion.map₂ (· + ·)⟩
```
to this:
```lean
@[to_additive]
instance [UniformSpace α] [Mul α] : Mul (Completion α) :=
⟨Completion.map₂ (· * ·)⟩
```
However, as Eric Wieser pointed out, doing so would create a bad diamond with the definition
```lean
instance [UniformSpace α] [TopologicalRing α] [UniformAddGroup α] [Ring α] : Mul (Completion α) :=
⟨curry <| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))⟩
```
in `Topology.Algebra.UniformRing`.
How should this diamond be resolved? Well, the definition of multiplication that uses `curry <| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))` is the "correct" one. For example, it yields the correct result if `α` is `ℚ`, unlike the definition that uses `Completion.map₂ (· * ·)`. (This is because `Completion.map₂` yields junk values if used on a function which is not uniformly continuous. Note, however, that if multiplication on `α` *is* uniformly continuous, then `Completion.map₂ (· * ·)` and `curry <| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))` are propositionally equal.) So, following Eric's suggestion, we remove the definition that uses `Completion.map₂ (· * ·)`, and generalize the other definition to any uniform space with a multiplication operation:
```lean
@[to_additive]
noncomputable instance [UniformSpace α] [Mul α] : Mul (Completion α) :=
⟨curry <| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))⟩
```
This requires slightly modifying some of the proofs in `Topology.Algebra.GroupCompletion`. For example, suppose that `α` is a uniform group. Since we can no longer use `Completion.continuous_map₂`, it becomes more efficient to prove that the multiplication, inversion, and division operations on `Completion α` are uniformly continuous *before* we prove that `Completion α` is a group.
- Previously, `Topology.Algebra.GroupCompletion` had an instance:
```lean
instance [UniformSpace α] [Sub α] : Sub (Completion α) := ...
```
Naively multiplicativizing this would yield
```lean
@[to_additive]
instance [UniformSpace α] [Inv α] : Inv (Completion α) := ...
```
Unfortunately, this would conflict with `Topology.Algebra.UniformField`, which already instantiates `Inv (Completion α)` when `α` is a uniform field. Instead, we use two different `instance` declarations. (If `α` is an additive group, then this instantiates `Neg (Completion α)` twice, and the instances are syntactically equal.)
```lean
@[to_additive]
noncomputable instance [UniformSpace α] [Group α] : Inv (Completion α) := ...
instance [UniformSpace α] [Neg α] : Neg (Completion α) := ...
```
This avoids the bad diamond (because a uniform field can never be a `Group`) while remaining backward compatible. Note that the `@[to_additive]` is necessary here, because it maintains the link between the additive setting and multiplicative setting. We use a similar method to instantiate `Div (Completion α)`.
- Some definitions in this file involve a module structure on `α`. We leave these as is and do not attempt to multiplicativize them at all.
- The instance of `DistribMulAction` must be multiplicativized to an instance of `MulDistribMulAction` manually.
Zulip thread: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Completion.20of.20a.20uniform.20multiplicative.20group
---
# (Small) Issue
Recall the following trick that this pull request uses to define inversion and negation on uniform spaces. The idea is that we define negation on the completion of any uniform space that has a negation operation, but we define inversion on only the completion of a uniform space that has the structure of a multiplicative group. We do this to avoid creating a bad diamond with the inversion operation on a uniform field.
```lean
@[to_additive]
noncomputable instance {α : Type*} [UniformSpace α] [Group α] : Inv (Completion α) := ...
instance {α : Type*} [UniformSpace α] [Neg α] : Neg (Completion α) := ...
```
Now, suppose that we want to prove `coe_inv_of_group` (resp. `coe_neg`), which states that the coercion `α → Completion α` commutes with inversion (resp. negation). In the current version of this pull request, `coe_inv_of_group` (resp. `coe_neg`) only applies to uniform multiplicative (resp. additive) groups. However, we do not use the fact that multiplication (resp. addition) on `α` is uniformly continuous to prove it. We only use the fact that inversion (resp. negation) is continuous. So, what we really want is to have more general statements that look like this:
```lean
theorem coe_inv_of_group {α : Type*} [UniformSpace α] [Group α] [ContinuousInv α] : ...
theorem coe_neg {α : Type*} [UniformSpace α] [Neg α] [ContinuousNeg α] : ...
```
Note that `coe_inv_of_group` needs the assumption `[Group α]`, because otherwise inversion is not defined on `Completion α` at all. However, `coe_neg` does not need the analogous assumption `[AdditiveGroup α]`.
The question is: If `coe_inv_of_group` and `coe_neg` are written in this more general form, how can we link them using `@[to_additive]`? Here is one option, but it obviously leaves something to be desired.
```lean
@[to_additive coe_neg_do_not_use_this_use_the_more_general_version]
theorem coe_inv_of_group {α : Type*} [UniformSpace α] [Group α] [ContinuousInv α] : ...
theorem coe_neg {α : Type*} [UniformSpace α] [Neg α] [ContinuousNeg α] : ...
```
Co-authored-by: Eric Wieser
---
[](https://gitpod.io/from-referrer/)
|
WIP
t-algebra
merge-conflict
help-wanted
t-topology
label:t-algebra$ |
342/217 |
Mathlib/Analysis/InnerProductSpace/Completion.lean,Mathlib/Analysis/Normed/Group/HomCompletion.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/GroupCompletion.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Algebra/UniformField.lean,Mathlib/Topology/Algebra/UniformMulAction.lean,Mathlib/Topology/Algebra/UniformRing.lean |
9 |
14 |
['eric-wieser', 'github-actions', 'trivial1711'] |
nobody |
369-55099 1 year ago |
unknown |
unknown |
| 7994 |
ericrbg author:ericrbg |
chore: generalize `LieSubalgebra.mem_map_submodule` |
---
Not sure if we should rename to something like `mem_map_iff_mem_map_submodule` or not.
[](https://gitpod.io/from-referrer/)
|
please-adopt
merge-conflict
t-algebra
label:t-algebra$ |
16/4 |
Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Subalgebra.lean |
2 |
3 |
['eric-wieser', 'ericrbg'] |
nobody |
277-15177 9 months ago |
unknown |
unknown |
| 15115 |
kkytola author:kkytola |
feat: Generalize assumptions in liminf and limsup results in ENNReals |
In a [review comment](https://github.com/leanprover-community/mathlib4/pull/13938#discussion_r1649744441) it was pointed out that results about liminf and limsup in ENNReal hold under milder assumptions. This PR does the generalization.
---
This PR is split off from #13938, where the review comment was made. The changes needed for the suggested generalization were of different kind than the simple PR's content, justifying a separate PR.
- [x] depends on: #13938
[](https://gitpod.io/from-referrer/)
|
t-order
merge-conflict
help-wanted
awaiting-author
t-topology
|
215/27 |
Mathlib/MeasureTheory/Measure/Portmanteau.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Topology/Instances/ENNReal.lean |
3 |
8 |
['Ruben-VandeVelde', 'github-actions', 'grunweg', 'j-loreaux', 'kkytola', 'leanprover-community-mathlib4-bot'] |
nobody |
264-82954 8 months ago |
unknown |
unknown |
| 12799 |
jstoobysmith author:jstoobysmith |
feat(LinearAlgebra/UnitaryGroup): Add properties of Special Unitary Group |
Add properties of the special unitary group, mirroring the properties of found in Algebra/Star/Unitary.lean. In particular, I add an instance of `specialUnitaryGroup` as a `Group`, `Star`, `InvolutiveStar`, and `StarMul`.
---
[](https://gitpod.io/from-referrer/)
|
please-adopt
t-algebra
new-contributor
merge-conflict
awaiting-author
label:t-algebra$ |
78/0 |
Mathlib/LinearAlgebra/UnitaryGroup.lean |
1 |
8 |
['chrisflav', 'jcommelin', 'leanprover-community-bot-assistant'] |
nobody |
242-38473 7 months ago |
unknown |
unknown |
| 22925 |
ggranberry author:ggranberry |
feat(Mathlib/PlaceHolder/ToeplitzHausdorff): Toeplitz-Hausdorff |
---
[](https://gitpod.io/from-referrer/)
|
WIP
new-contributor
will-close-soon
awaiting-author
help-wanted
t-analysis
|
411/0 |
Mathlib/PlaceHolder/ToeplitzHausdorff.lean,Mathlib/PlaceHolder/ToeplitzHausdorff_v2.lean |
2 |
11 |
['faenuccio', 'ggranberry', 'github-actions'] |
faenuccio assignee:faenuccio |
175-3550 5 months ago |
unknown |
unknown |
| 8102 |
miguelmarco author:miguelmarco |
feat(Tactic): add `unify_denoms` and `collect_signs` tactics |
This PR adds four new tactics:
- `unify_denoms` tries to put expressions with several divisions in a form with only one division. In the case of fields, it works similarly to `field_simp`, but if the hypothesis about denominators being nonzero are not present, it assumes them, and leaves them as new goals to prove. In that sense, it is an "unsafe" tactic (but can be useful nevertheless, for example when you can't find which exact hypothesis is missing). It also works with expressions of naturals and Euclidean domains, assuming the corresponding hypothesis about the denominators dividing the numerators.
- `unify_denoms!` extends `unify_denoms` to work with (in)equalities, assuming also that the denominators, once in normal form, are positive.
- `collect_signs` works similarly with expressions using sums and substractions: it tries to put them in a form of one sum minus other sum. In the case of working with naturals, it assumes that we never substract a bigger number from a smaller one.
Both are implemented essentially as a macro that combines several rewriting rules. Some new lemmas with the corresponding rules are added.
--- |
please-adopt
new-contributor
merge-conflict
modifies-tactic-syntax
good first issue
t-meta
|
407/0 |
Mathlib.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CollectSigns.lean,Mathlib/Tactic/UnifyDenoms.lean,MathlibTest/unify_denoms.lean,scripts/noshake.json |
7 |
55 |
['Paul-Lez', 'YaelDillies', 'github-actions', 'joneugster', 'kbuzzard', 'mathlib4-merge-conflict-bot', 'miguelmarco'] |
nobody |
173-8938 5 months ago |
unknown |
unknown |
| 7300 |
ah1112 author:ah1112 |
feat: synthetic geometry |
This is adding synthetic geometry using Avigad's axioms and formalizing Euclid Book I, through the Pythagorean theorem.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
help-wanted
t-euclidean-geometry
|
2661/0 |
Mathlib.lean,Mathlib/Geometry/Synthetic/Avigad/Axioms.lean,Mathlib/Geometry/Synthetic/Avigad/EuclidBookI.lean,Mathlib/Geometry/Synthetic/Avigad/Tactics.lean |
4 |
74 |
['ah1112', 'alreadydone', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'plp127', 'tb65536', 'urkud'] |
nobody |
166-36315 5 months ago |
unknown |
unknown |
| 25700 |
grunweg author:grunweg |
feat: lint upon uses of the `mono` tactic |
suggesting to use `gcongr` instead.
In general, `mono` is unmaintained, was only partially ported --- and gcongr at this point is more featureful, actively developed and has a nicer user interface. The topic was also discussed [on zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Porting.20note.3A.20Fixing.20up.20.60mono.60/with/445125798).
---
TODO: update the linter wording, fix its implementation and wait until tests pass
- [ ] depends on: #25698
[](https://gitpod.io/from-referrer/)
|
please-adopt
t-linter
RFC
|
15/0 |
MathlibTest/DeprecatedSyntaxLinter.lean,MathlibTest/Monotonicity.lean |
2 |
3 |
['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot'] |
nobody |
164-71903 5 months ago |
unknown |
unknown |
| 26085 |
grunweg author:grunweg |
feat: disjoint unions distribute with products of manifolds |
This PR continues the work from #22611.
Original PR: https://github.com/leanprover-community/mathlib4/pull/22611 |
please-adopt
WIP
t-differential-geometry
merge-conflict
|
75/6 |
Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean |
2 |
3 |
['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot'] |
nobody |
96-5644 3 months ago |
unknown |
unknown |
| 5863 |
eric-wieser author:eric-wieser |
feat: add elaborators for concrete matrices |
---
- [x] depends on: #5866
- [ ] depends on: #5897
[](https://gitpod.io/from-referrer/)
|
merge-conflict
help-wanted
blocked-by-other-PR
t-meta
|
257/7 |
Mathlib/Control/Monad/Cont.lean,Mathlib/Data/Matrix/Auto.lean,MathlibTest/matrix_auto.lean |
3 |
8 |
['eric-wieser', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot'] |
nobody |
77-16347 2 months ago |
unknown |
unknown |
| 5919 |
MithicSpirit author:MithicSpirit |
feat: implement orthogonality for AffineSubspace |
Define `AffineSubspace.orthogonal` and `AffineSubspace.IsOrtho`, as well as develop an API emulating that of `Submodule.orthogonal` and `Submodule.IsOrtho`, respectively. Additionally, provide some relevant lemmas exclusive to affine subspaces, which are mostly to do with the relationship between orthogonality and `AffineSubspace.Parallel`.
Closes #5539
---
Still WIP as I need to add more docstrings as well as notations for the new definitions.
[](https://gitpod.io/from-referrer/)
|
WIP
new-contributor
merge-conflict
help-wanted
t-analysis
|
287/0 |
Mathlib.lean,Mathlib/Analysis/InnerProductSpace/AffineSubspace.lean |
2 |
7 |
['MithicSpirit', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot'] |
MithicSpirit assignee:MithicSpirit |
77-16346 2 months ago |
unknown |
unknown |
| 13442 |
dignissimus author:dignissimus |
feat: mabel tactic for multiplicative abelian groups |
Mabel tactic for multiplicative abelian groups (#10361)
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
merge-conflict
modifies-tactic-syntax
awaiting-author
help-wanted
t-meta
|
439/0 |
Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MAbel.lean,MathlibTest/mabel.lean |
4 |
11 |
['BoltonBailey', 'dignissimus', 'github-actions', 'joneugster', 'kbuzzard', 'mathlib4-merge-conflict-bot'] |
joneugster assignee:joneugster |
77-16082 2 months ago |
unknown |
unknown |
| 26398 |
ChrisHughes24 author:ChrisHughes24 |
feat(ModelTheory): definable functions |
---
Possibly this should be generalized to partial functions.
I migrated the PR by hand instead of using the script.
- [x] depends on: #20166
- [x] depends on: #20161
- [x] depends on: #20115
- [x] depends on: #20174
- [x] depends on: #20175
- [x] depends on: #21948
[](https://gitpod.io/from-referrer/)
|
please-adopt
merge-conflict
t-logic
|
618/0 |
Mathlib.lean,Mathlib/ModelTheory/FunctionalFormula.lean |
2 |
13 |
['ChrisHughes24', 'github-actions', 'jcommelin', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'staroperator'] |
nobody |
77-14958 2 months ago |
99-4423 99 days ago |
87-74589 87 days |
| 29675 |
yury-harmonic author:yury-harmonic |
feat(Wolstenholme): new file |
Co-authored-by: @Aristotle-Harmonic
---
I still need to cleanup the proof and write the docs.
For now, it's just what the AI generated, forward-ported to the latest Mathlib.
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
help-wanted
t-data
|
198/0 |
Mathlib.lean,Mathlib/Data/Nat/Choose/Wolstenholme.lean |
2 |
4 |
['github-actions', 'mathlib4-merge-conflict-bot', 'yury-harmonic'] |
nobody |
77-13734 2 months ago |
unknown |
unknown |
| 6859 |
MohanadAhmed author:MohanadAhmed |
feat: TryLean4Bundle: Windows Bundle Creator |
# `TryLean4Bundle`: Windows Bundle Creator
A Windows batch script and a CI yml file that create an self extracting archive. The user should
1. just download the archive,
2. double click the archive to expand
3. double click the `RunLean.bat` script in the expanded archive.
The script currently downloads 7 dependencies into CI then unpacks them in the appropriate locations and finally packs them back.
To try a bundle created using these scripts but from a different repo see (https://github.com/MohanadAhmed/TryLean4Bundle/releases)
---
[](https://gitpod.io/from-referrer/)
|
WIP
help-wanted
CI
|
114/0 |
.github/workflows/mk_windows_bundle.yml,scripts/windowsBundle.bat |
2 |
0 |
[] |
nobody |
76-74059 2 months ago |
unknown |
unknown |
| 11800 |
JADekker author:JADekker |
feat: KappaLindelöf spaces |
Define KappaLindelöf spaces by following the first one-third of the API for Lindelöf spaces. The remainder will be added in a future PR.
---
[](https://gitpod.io/from-referrer/)
|
please-adopt
merge-conflict
t-topology
awaiting-zulip
|
301/2 |
Mathlib.lean,Mathlib/Topology/Compactness/KappaLindelof.lean,Mathlib/Topology/Compactness/Lindelof.lean |
3 |
38 |
['ADedecker', 'JADekker', 'PatrickMassot', 'StevenClontz', 'adomani', 'github-actions', 'grunweg', 'kim-em', 'urkud'] |
nobody |
76-73923 2 months ago |
unknown |
unknown |
| 12087 |
JADekker author:JADekker |
feat: complete API for K-Lindelöf spaces |
---
- [ ] depends on: #11800 (which is now awaiting a design decision)
[](https://gitpod.io/from-referrer/)
|
please-adopt
merge-conflict
t-topology
blocked-by-other-PR
|
789/17 |
Mathlib.lean,Mathlib/Order/Filter/CardinalInter.lean,Mathlib/Topology/Compactness/KLindelof.lean,Mathlib/Topology/Compactness/Lindelof.lean |
4 |
2 |
['github-actions', 'leanprover-community-mathlib4-bot'] |
nobody |
76-73916 2 months ago |
unknown |
unknown |
| 12394 |
JADekker author:JADekker |
feat: define pre-tight and tight measures |
Define tight measures (by first defining separable and pre-tight measures).
Define some api for all three concepts
Prove Ulam's tightness theorem and a strengthened version of this.
---
[](https://gitpod.io/from-referrer/)
|
please-adopt
merge-conflict
awaiting-author
t-measure-probability
|
503/0 |
Mathlib.lean,Mathlib/MeasureTheory/Measure/Tight.lean |
2 |
34 |
['EtienneC30', 'JADekker', 'github-actions', 'sgouezel'] |
nobody |
76-73896 2 months ago |
unknown |
unknown |
| 14686 |
smorel394 author:smorel394 |
feat(AlgebraicGeometry/Grassmannian): define the Grassmannian scheme |
# The Grassmannian scheme
Define the Grassmannian scheme by gluing affine charts.
We fix a commutative ring `K`, a free `K`-module of finite type `V` and two natural numbers
`r` and `c`. The scheme we define should parametrize surjective `K`-linear maps
`V →ₗ[K] (Fin r → K)`, assuming that `V` is of rank `r + c`. We actually define the scheme
without assuming the condition on the rank of `V`, but it is empty unless the rank of `V` is
`r + c`.
Main definitions:
* `Grassmannian.glueData K V r c`: the `AlgebraicGeometry.Scheme.GlueData` defining the
Grassmannian scheme.
* `Grassmannian K V r c`: the Grassmannian scheme, defined as
`(Grassmannian.glueData K V r c).glued`.
* `Grassmannian.structMorphism K V r c`: the structural morphism from `Grassmannian K V r c`
to `Spec K`.
# Implementation
We use as index type for the charts the type `Basis (Fin (r + c)) K V` (so this is empty unless
`V` is free of rank `r + c`). All the charts are the same and equal to the affine space with
coordinates indexed by `Fin c × Fin r`, that is, to `Spec (MvPolynomial (Fin c × Fin r) K)`.
The idea is that, for `i` in `Basis (Fin (r + c)) K V`, the corresponding chart will
parametrize all surjective `K`-linear maps `φ : V →ₗ[K] (Fin r → K)` that become isomorphisms
when restricted to the `K`-submodule generated by the first `r` vectors of the basis `i`.
To get the point of the chart corresponding to `φ`, we take the matrix of `φ` in the basis `i` of
`V` and the canonical basis of `Fin r → K`, we divide it on the right by its top `r × r`
square submatrix (which is invertible by assumption), and we taken the botton `c × r`
submatrix.
This is almost the usual description of the Grassmannian by charts, with three differences:
* We consider the Grassmannian parametrizing `r`-dimensional quotients of `V` instead of
`r`-dimensional subspaces of `V`, because this is more natural when working over a general
ring (or scheme).
* In the usual description, we fix a basis of `V` and index the chart by its subsets `I` of
cardinality `r`. Here, to avoid making a choice, we instead index charts by the set of
bases of `V` and always choose the subset `I` to consist of the first `r` vectors.
* Instead of working with `FiniteDimensional.finrank K V - r`, which would cause technical
trouble because of the way subtraction works on `ℕ`, we introduce the codimension `c` as an
auxiliary variable, and our constructions are only interesting when `r + c` is equal to
`FiniteDimensional.finrank K V`.
# Why is this a WIP
* There a bunch of lemmas in the file `AlgebraicGeometry/Grassmannian/Lemmas.lean` that either should not be necessary or should be put in another PR for some other part of mathlib.
* The proofs in `AlgebraicGeometry/Grassmannian/Basic.lean` are probably too complicated, and the names suck.
# Notes.
This contribution was created as part of the AIM workshop "Formalizing algebraic geometry" in
June 2024.
---
- [x] depends on: #14711
[](https://gitpod.io/from-referrer/)
|
please-adopt
WIP
workshop-AIM-AG-2024
merge-conflict
t-algebraic-geometry
|
1002/0 |
Mathlib.lean,Mathlib/AlgebraicGeometry/Grassmannian/Basic.lean,Mathlib/AlgebraicGeometry/Grassmannian/Lemmas.lean |
3 |
15 |
['erdOne', 'github-actions', 'joelriou', 'leanprover-community-mathlib4-bot', 'smorel394'] |
nobody |
76-73852 2 months ago |
unknown |
unknown |
| 32095 |
grunweg author:grunweg |
chore: fix some explicitVarOfIff linter errors |
Needs a merge, and removing the linter changes... should be re-done and split out!
---
[](https://gitpod.io/from-referrer/)
|
please-adopt
WIP
merge-conflict
|
320/146 |
Mathlib/Analysis/LocallyConvex/Bounded.lean,Mathlib/Analysis/Oscillation.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/MeasureTheory/Measure/EverywherePos.lean,Mathlib/SetTheory/Ordinal/Topology.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/Algebra/Monoid.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/Category/TopCat/Basic.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/CompactOpen.lean,Mathlib/Topology/Compactness/LocallyCompact.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/DenseEmbedding.lean,Mathlib/Topology/Gluing.lean,Mathlib/Topology/Homeomorph.lean,Mathlib/Topology/IndicatorConstPointwise.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/Irreducible.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/LocalAtTarget.lean,Mathlib/Topology/Maps/Basic.lean,Mathlib/Topology/MetricSpace/Isometry.lean,Mathlib/Topology/NoetherianSpace.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/Partial.lean,Mathlib/Topology/PartialHomeomorph.lean,Mathlib/Topology/PartitionOfUnity.lean,Mathlib/Topology/QuasiSeparated.lean,Mathlib/Topology/Separation.lean,Mathlib/Topology/TietzeExtension.lean,Mathlib/Topology/UniformSpace/Ascoli.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Cauchy.lean,Mathlib/Topology/UniformSpace/CompactConvergence.lean,Mathlib/Topology/UniformSpace/Completion.lean,Mathlib/Topology/UniformSpace/Equicontinuity.lean,Mathlib/Topology/UniformSpace/Matrix.lean,Mathlib/Topology/UniformSpace/Pi.lean,Mathlib/Topology/UnitInterval.lean,Mathlib/Topology/UrysohnsBounded.lean,Mathlib/Topology/UrysohnsLemma.lean,Mathlib/Topology/VectorBundle/Basic.lean,lakefile.lean,scripts/run_linter.lean |
49 |
0 |
[] |
nobody |
71-968 2 months ago |
unknown |
unknown |
| 10654 |
smorel394 author:smorel394 |
feat(LinearAlgebra/{ExteriorPower,LinearIndependent,TensorPower}): define the exterior powers of a module and prove some of their basic properties |
This introduces the exterior powers of a module and proves some of their basic properties, in `LinearAlgebra/ExteriorPower/Basic.lean` and `LinearAlgebra/ExteriorPower/Generators.lean`. It also adds a lemma in `LinearAlgebra/LinearIndependent.lean` (`linearIndependent_of_dualFamily` : if a family of vectors admits a "dual" family of linear forms, then it is linearly independent) and a construction in `LinearAlgebra/TensorPower.lean` (`linearFormOfFamily` : the linear form on the tensor power of `M` obtained by multiplying a family of linear forms on `M`).
# Main definitions
## In `LinearAlgebra/ExteriorPower/Basic.lean`:
* `ExteriorPower R n M` is the `n`th exterior power of a `R`-module `M`, defined as `LinearMap.range (ExteriorAlgebra.ι R : M →ₗ[R] ExteriorAlgebra R M) ^ n`. We also introduce the notation `Λ[R]^n M` for `ExteriorPower R n M`.
* `ExteriorPower.ιMulti` is the canonical alternating map on `M` with values in `Λ[R]^n M`.
* `ExteriorPower.map`: functoriality of exterior powers with respect to linear maps between modules.
* `ExteriorPower.toTensorPower`: linear map from the `n`th exterior power to the `n`th
tensor power (coming from `MultilinearMap.alternatization` via the universal property of
exterior powers).
## In `LinearAlgebra/ExteriorPower/Generators.lean`:
* `ExteriorPower.BasisOfBasis`: If `b` is a basis of `M` (indexed by a linearly ordered type),
the basis of the `n`th exterior power of `M` formed by the `n`-fold exterior products of elements
of `b`.
# Main theorems
## In `LinearAlgebra/ExteriorPower/Basic.lean`:
* The image of `ExteriorPower.ιMulti` spans `Λ[R]^n M`.
* `ExteriorPower.liftAlternatingEquiv` (universal property of the `n`th exterior power of `M`):
the linear equivalence between linear maps from `Λ[R]^n M` to a module `N` and `n`-fold
alternating maps from `M` to `N`.
* `ExteriorPower.map_injective_field`: If `f : M →ₗ[R] N` is injective and `R` is a field, then
`ExteriorPower.map n f` is injective.
* `ExteriorPower.map_surjective`: If `f : M →ₗ[R] N` is surjective, then `ExteriorPower.map n f`
is surjective.
* `ExteriorPower.mem_exteriorPower_is_mem_finite`: Every element of `Λ[R]^n M` is in the image of
`Λ[R]^n P` for some finitely generated submodule `P` of `M`.
## In `LinearAlgebra/ExteriorPower/Generators.lean`:
* `ExteriorPower.Finite`: The `n`th exterior power of a finite module is a finite module.
* `ExteriorPower.span_top_of_span_top` and `ExteriorPower.span_top_of_span_top'`: If a family of
vectors spans `M`, then the family of its `n`-fold exterior products spans `Λ[R]^n M`. (We give
versions in the exterior algebra and in the exterior power.)
* `ExteriorPower.FreeOfFree`: If `M` is a free module, then so is its `n`th exterior power.
* `ExteriorPower.FinrankOfFiniteFree`: If `R` satisfies the strong rank condition and `M` is
finite free of rank `r`, then the `n`th exterior power of `M` is of finrank `Nat.choose r n`.
* `ExteriorPower.ιMulti_family_linearIndependent_field`: If `R` is a field, and if `v` is a
linearly independent family of vectors (indexed by a linearly ordered type), then the family of
its `n`-fold exterior products is also linearly independent.
- [x] depends on: #10744
- [ ] depends on: #11156
- [x] depends on: #18590
---
[](https://gitpod.io/from-referrer/)
|
please-adopt
t-algebra
large-import
merge-conflict
label:t-algebra$ |
739/0 |
Mathlib.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/LinearAlgebra/TensorPower.lean |
5 |
46 |
['Ruben-VandeVelde', 'YaelDillies', 'bustercopley', 'eric-wieser', 'github-actions', 'joelriou', 'leanprover-bot', 'mathlib4-dependent-issues-bot', 'mattrobball', 'pink10000', 'smorel394'] |
eric-wieser assignee:eric-wieser |
44-68640 1 month ago |
unknown |
unknown |
| 5934 |
eric-wieser author:eric-wieser |
feat: port Data.Rat.MetaDefs |
---
[](https://gitpod.io/from-referrer/)
This needs some eyes from people familiar with Qq |
merge-conflict
help-wanted
mathlib-port
t-meta
|
183/0 |
Mathlib.lean,Mathlib/Data/Rat/MetaDefs.lean,test/rat.lean |
3 |
5 |
['eric-wieser', 'gebner', 'vihdzp'] |
nobody |
39-61385 1 month ago |
unknown |
unknown |
| 6042 |
MohanadAhmed author:MohanadAhmed |
feat(LinearAlgebra/Matrix/SVD): Singular Value Decomposition of R or C Matrices |
This file provides proves the SVD theorem which decomposes a real/complex matrix into left eigenvectors, singular values block diagonal matrix and right eigenvectors.
Any matrix A (M × N) with rank r = A.rank and with elements in ℝ or ℂ fields can be decompsed into the product of three matrices:
$$A = USV$$
* The three matrices are defined as
- $U$: an M × M matrix containing the left eigenvectors of the matrix
- $S$: an M × N matrix with an r × r block in the upper left corner with nonzero singular values
- $V$: an N × N matrix containing the right eigenvectors of the matrix
Note that
* $S$ is a block matrix $S = [S₁₁, S₁₂; S₂₁, S₂₂]$ with
- $S₁₁$: a diagonal r × r matrix and
- $S₁₂$ : r × (N - r) zero matrix, S₂₁ : (M - r) × r zero matrix and
- $S₂₂$: (M - r) × (N - r) zero matrix
* $U$ is a block column matrix U = [U₁ U₂] with
- $U₁$ : a M × r containing left eigenvectors with nonzero singular values.
- $U₂$ : a M × (M - r) containing left eigenvectors with zero singular values.
* $V$ is a block column matrix V = [V₁ V₂] with
- $V₁$ : a N × r containing right eigenvectors with nonzero singular values.
- $V₂$ : a M × (M - r) containing right eigenvectors with zero singular values.
Since in mathlib the eigenvalues of hermitian matrices are defined in an "arbitrary" undetermined order, we begin by partition the singular values into zero and non-zero values. We partition the corresponding eigenvectors from AᴴA and AAᴴ using similar rearrangements. These are included in `SVD.svdReindex`. The basic API for Column and Row partitioned matrices is from `ColumnRowPartitioned`.
We then proceed to transfer some of the lemmas we need about eigenvector matrices (for example that they are unitary: i.e. inverse is conjugate transpose.). Note that since invertibility in mathlib is defined for square matrices while our matrices are partitioned i.e. N × (N₁ ⊕ N₂) and N ≃ (N ⊕ N₂), Lean cannot apply the Invertible definition. We workaround this were necessary.
Lemma `reduced_spectral_theorem` (`reduced_spectral_theorem'`) shows that AᴴA and AAᴴ, can be reduced to products containing only the non-zero singular eigenvectors. This is later used in proving the main SVD theroem. A few lemmas are provided about the invertibility of the non-zero singular values matrix: `svdσ_inv`, `σ_inv_μ_σ_inv_eq_one`, `IsUnit_det_svdσ`, `IsUnit_det_svdσ_mapK` and `svdσ_inv_mapK`.
To make relating left eigenvectors to right eigenvectors easier we define U₁ = AV₁σ⁻¹ while U₂ is obtained from the eigenvectors of (AAᴴ). This avoid a lengthy reindexing operation with many proofs. The vectors in U₂ have no such issue since they are multiplied by zero singular values anyway.
Co-authored-by: Mohanad Ahmed
---
[](https://gitpod.io/from-referrer/)
|
please-adopt
WIP
t-algebra
merge-conflict
label:t-algebra$ |
588/0 |
Mathlib.lean,Mathlib/LinearAlgebra/Matrix/SVD/Defs.lean,Mathlib/LinearAlgebra/Matrix/SVD/Reindex.lean |
3 |
116 |
['MohanadAhmed', 'Vierkantor', 'alexjbest', 'eric-wieser', 'j-loreaux', 'jcommelin', 'mathlib4-merge-conflict-bot', 'sgouezel', 'vihdzp'] |
nobody |
39-60912 1 month ago |
unknown |
unknown |
| 21344 |
kbuzzard author:kbuzzard |
chore: attempt to avoid diamond in OreLocalization |
---
[](https://gitpod.io/from-referrer/)
|
please-adopt
t-algebra
label:t-algebra$ |
16/5 |
Mathlib/RingTheory/OreLocalization/Basic.lean |
1 |
6 |
['erdOne', 'github-actions', 'kbuzzard'] |
nobody |
30-50073 30 days ago |
unknown |
unknown |
| 17176 |
arulandu author:arulandu |
feat: integrals and integrability with .re |
Lemmas for swapping order of .re and integration/integrability.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
new-contributor
t-measure-probability
please-adopt
|
49/0 |
Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean |
4 |
32 |
['EtienneC30', 'arulandu', 'github-actions', 'loefflerd'] |
nobody |
29-57488 29 days ago |
unknown |
unknown |
| 26088 |
grunweg author:grunweg |
chore(Linter/DirectoryDependency): move forbidden directories into a JSON file |
This PR continues the work from #25406.
Original PR: https://github.com/leanprover-community/mathlib4/pull/25406 |
please-adopt
t-linter
merge-conflict
|
387/19 |
Mathlib/Tactic/Linter/DirectoryDependency.lean,scripts/README.md,scripts/forbiddenDirs.json |
3 |
5 |
['Vierkantor', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot'] |
nobody |
27-43263 27 days ago |
unknown |
unknown |
| 24010 |
grunweg author:grunweg |
feat(Counterexamples): a non-negative function, not a.e. zero, with vanishing lowe… |
…r Lebesgue integral.
Came up in #23707, let's document this while we're at it.
---
- [ ] depends on: #20722
[](https://gitpod.io/from-referrer/)
|
merge-conflict
please-adopt
WIP
blocked-by-other-PR
t-measure-probability
|
110/0 |
Counterexamples.lean,Counterexamples/LIntegralZero.lean |
2 |
3 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
26-82118 26 days ago |
unknown |
unknown |
| 25905 |
mans0954 author:mans0954 |
feat(RingTheory/Polynomial/SmallDegreeVieta): polynomial versions of results in Algebra.QuadraticDiscriminant |
This PR continues the work from #25605.
Original PR: https://github.com/leanprover-community/mathlib4/pull/25605 |
merge-conflict
t-ring-theory
please-adopt
|
77/8 |
Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/RingTheory/Polynomial/SmallDegreeVieta.lean |
2 |
47 |
['chrisflav', 'github-actions', 'kckennylau', 'mans0954', 'mathlib4-merge-conflict-bot', 'ocfnash'] |
chrisflav assignee:chrisflav |
24-46381 24 days ago |
150-74760 150 days ago |
81-61193 81 days |
| 25907 |
mans0954 author:mans0954 |
feat: low order roots of unity |
This PR continues the work from #25470.
Original PR: https://github.com/leanprover-community/mathlib4/pull/25470 |
t-algebra
please-adopt
label:t-algebra$ |
182/0 |
Mathlib/Algebra/CharP/Invertible.lean,Mathlib/RingTheory/RootsOfUnity/Complex.lean |
2 |
3 |
['github-actions', 'mans0954', 'urkud'] |
jcommelin assignee:jcommelin |
24-46364 24 days ago |
76-59949 76 days ago |
115-85002 115 days |
| 26339 |
mans0954 author:mans0954 |
feat(Analysis/Normed/Module/WeakDual): Banach Dieudonné Lemma |
This PR continues the work from #16316.
Original PR: https://github.com/leanprover-community/mathlib4/pull/16316 |
merge-conflict
WIP
t-analysis
large-import
please-adopt
|
377/3 |
Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Topology/UniformSpace/Cauchy.lean |
4 |
5 |
['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot'] |
nobody |
24-46342 24 days ago |
unknown |
unknown |
| 26340 |
mans0954 author:mans0954 |
feat(Algebra/Module/NestAlgebra): Nest algebras |
This PR continues the work from #18705.
Original PR: https://github.com/leanprover-community/mathlib4/pull/18705 |
merge-conflict
t-algebra
please-adopt
label:t-algebra$ |
184/0 |
Mathlib.lean,Mathlib/Algebra/Module/NestAlgebra.lean,Mathlib/Order/Nest.lean,Mathlib/Order/Preorder/Chain.lean,docs/references.bib |
5 |
3 |
['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot'] |
nobody |
24-46326 24 days ago |
unknown |
unknown |
| 26341 |
mans0954 author:mans0954 |
feat(LinearAlgebra/QuadraticForm/Basis): Free Tensor product of Quadratic Maps |
This PR continues the work from #19432.
Original PR: https://github.com/leanprover-community/mathlib4/pull/19432 |
merge-conflict
WIP
t-algebra
large-import
please-adopt
label:t-algebra$ |
888/0 |
Mathlib.lean,Mathlib/Data/Sym/Sym2/Prod.lean,Mathlib/LinearAlgebra/QuadraticForm/Basis.lean |
3 |
3 |
['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot'] |
nobody |
24-46095 24 days ago |
unknown |
unknown |
| 26344 |
mans0954 author:mans0954 |
feat(Analysis/NormedSpace/MStructure): The component projections on WithLp 1 (α × β) are L-projections |
This PR continues the work from #20380.
Original PR: https://github.com/leanprover-community/mathlib4/pull/20380 |
merge-conflict
WIP
t-analysis
file-removed
please-adopt
|
20/1 |
Mathlib.lean,Mathlib/Analysis/Normed/Lp/MStructure.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean |
3 |
3 |
['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot'] |
nobody |
24-40891 24 days ago |
unknown |
unknown |
| 26345 |
mans0954 author:mans0954 |
feat(Analysis/LocallyConvex/Polar): Bipolar theorem |
The bipolar theorem states that the polar of the polar of a set `s` is equal to the closed absolutely convex hull of `s`.
The argument here follows Conway, Chapter V. 1.8.
This PR continues the work from #20843.
Original PR: https://github.com/leanprover-community/mathlib4/pull/20843
- [x] depends on: #27316 |
merge-conflict
awaiting-author
t-analysis
large-import
please-adopt
|
322/64 |
Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/Bipolar.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/LocallyConvex/WeakDual.lean,Mathlib/Topology/Algebra/Module/LinearSpan.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakBilin.lean |
7 |
110 |
['JonBannon', 'eric-wieser', 'faenuccio', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mans0954', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mcdoll'] |
faenuccio and j-loreaux assignee:j-loreaux assignee:faenuccio |
24-40886 24 days ago |
unknown |
unknown |
| 26347 |
mans0954 author:mans0954 |
feat(Data/Finset/RangeDistance): abs_sub_lt_of_mem_finset_range |
This PR continues the work from #23161.
Original PR: https://github.com/leanprover-community/mathlib4/pull/23161 |
merge-conflict
t-data
please-adopt
|
30/0 |
Mathlib.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Data/Finset/RangeDistance.lean |
3 |
3 |
['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot'] |
alreadydone assignee:alreadydone |
24-40868 24 days ago |
77-14966 77 days ago |
142-36931 142 days |
| 26349 |
mans0954 author:mans0954 |
feat(Analysis/SpecialFunctions/Trigonometric/Basic): sin and cos of multiples of π / 3 |
This PR continues the work from #25009.
Original PR: https://github.com/leanprover-community/mathlib4/pull/25009 |
help-wanted
t-analysis
please-adopt
|
159/0 |
Mathlib/Algebra/Order/Monoid/NatCast.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Data/Nat/Cast/Defs.lean,MathlibTest/trigonometry.lean |
4 |
3 |
['github-actions', 'mans0954', 'themathqueen'] |
nobody |
24-40824 24 days ago |
unknown |
unknown |
| 26348 |
mans0954 author:mans0954 |
feat(Analysis/LocallyConvex/Prime): the prime map |
This PR continues the work from #24385.
Original PR: https://github.com/leanprover-community/mathlib4/pull/24385 |
merge-conflict
WIP
t-analysis
please-adopt
|
125/0 |
Mathlib.lean,Mathlib/Analysis/LocallyConvex/Prime.lean |
2 |
3 |
['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot'] |
nobody |
24-40815 24 days ago |
unknown |
unknown |
| 26983 |
mans0954 author:mans0954 |
feat(Order/LatticeElements): distributive, standard and neutral elements of a lattice |
Defines distributive, standard and neutral elements of a lattice and gives equivalent conditions.
---
- [x] depends on: #26836
[](https://gitpod.io/from-referrer/)
|
merge-conflict
WIP
t-order
please-adopt
|
238/0 |
Mathlib.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/LatticeElements.lean |
3 |
5 |
['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
24-40782 24 days ago |
121-65039 121 days ago |
0-19323 5 hours |
| 29980 |
mans0954 author:mans0954 |
refactor(RingTheory/Polynomial/Resultant/Quadratic): Re-implement QuadraticDiscriminant for R[X] |
Re-implement `Algebra/QuadraticDiscriminant` for polynomials.
[Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/discriminants.20of.20low.20degree.20polynomials/with/538010519)
---
- [ ] depends on: #29981
[](https://gitpod.io/from-referrer/)
|
merge-conflict
please-adopt
|
208/0 |
Mathlib.lean,Mathlib/RingTheory/Polynomial/Resultant/Quadratic.lean |
2 |
4 |
['JovanGerb', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
JovanGerb assignee:JovanGerb |
24-40749 24 days ago |
77-13703 77 days ago |
41-43711 41 days |
| 29387 |
mans0954 author:mans0954 |
feat(Analysis/LocallyConvex/WeakSpace): toWeakSpace_closedAbsConvexHull_eq |
The closed absolutely convex hull taken in the weak topology coincides with the closed absolutely convex hull taken in the original topology.
---
- [ ] depends on: #29378
[](https://gitpod.io/from-referrer/)
|
merge-conflict
blocked-by-other-PR
t-analysis
please-adopt
|
133/68 |
Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/AbsConvexOpen.lean,Mathlib/Analysis/LocallyConvex/BalancedCoreHull.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/Normed/Module/Dual.lean |
6 |
5 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
24-40730 24 days ago |
150-65061 150 days ago |
0-5 5 seconds |
| 29378 |
mans0954 author:mans0954 |
feat(Analysis/LocallyConvex/AbsConvex): Balanced and AbsConvex sets under linear maps |
Provide `Balanced` and `AbsConvex` versions of `Convex.linear_image`, `Convex.linear_preimage` and the `is_linear` equivalents.
---
- [ ] depends on: #29342
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-analysis
please-adopt
|
133/68 |
Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/AbsConvexOpen.lean,Mathlib/Analysis/LocallyConvex/BalancedCoreHull.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/Normed/Module/Dual.lean |
6 |
4 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
24-40570 24 days ago |
112-30471 112 days ago |
0-14240 3 hours |
| 29856 |
mans0954 author:mans0954 |
feat(Analysis/Normed/Ring/Basic): Add NonUnitalNonAssocSeminormedRing and NonUnitalNonAssocNormedRing |
Adds the classes `NonUnitalNonAssocSeminormedRing` and `NonUnitalNonAssocNormedRing` and relaxes the `NonUnitalSeminormedRing` section to `NonUnitalNonAssocSeminormedRing`.
Examples of non-unital non-associative normed rings include non-untial JB-algebras and non-unital JB*-algebras.
---
[](https://gitpod.io/from-referrer/)
|
t-analysis
please-adopt
|
110/11 |
Mathlib/Analysis/Normed/Ring/Basic.lean,MathlibTest/TCSynth.lean |
2 |
15 |
['github-actions', 'j-loreaux', 'leanprover-bot'] |
ADedecker assignee:ADedecker |
24-40488 24 days ago |
77-50141 77 days ago |
57-10323 57 days |
| 12934 |
grunweg author:grunweg |
chore: replace more uses of > or ≥ by < or ≤ |
These were flagged by the linter in https://github.com/leanprover-community/mathlib4/pull/12879: it is easy to simple avoid > or ≥ in hypotheses or haves.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
help-wanted
|
41/42 |
Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2019Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib/Tactic/Linarith/Datatypes.lean,test/cancel_denoms.lean,test/congr.lean,test/interval_cases.lean,test/observe.lean |
15 |
12 |
['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'jcommelin', 'urkud'] |
nobody |
23-27796 23 days ago |
unknown |
unknown |
| 34131 |
Ruben-VandeVelde author:Ruben-VandeVelde |
fix: update create_deprecated_modules.lean |
---
This is a wip; I'm hoping someone can pick it up and make sure CI builds it going forward. @adomani @kim-em any takers?
[](https://gitpod.io/from-referrer/)
|
please-adopt
WIP
CI
|
26/22 |
scripts/create_deprecated_modules.lean |
1 |
2 |
['adomani', 'github-actions'] |
nobody |
15-13154 15 days ago |
unknown |
unknown |
| 8608 |
eric-wieser author:eric-wieser |
feat: multiplicativize `AddTorsor` |
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
WIP
t-algebra
please-adopt
label:t-algebra$ |
268/199 |
Mathlib/Algebra/AddTorsor.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Data/Set/Pointwise/SMul.lean,Mathlib/Tactic/ToAdditive.lean |
4 |
2 |
['alreadydone'] |
nobody |
7-41341 7 days ago |
unknown |
unknown |
| 30463 |
grunweg author:grunweg |
feat: support products and disjoint unions in the differential geometry elaborators |
Add support for inferring a model with corners on
- products of manifolds
- disjoint unions of manifolds
- an open subset of a manifold
Note that these can be nested (e.g., a product with multiple factors, a disjoint union of four manifolds or combinations of these).
For binary products of normed spaces, we intentionally refuse to infer a model with corners, as there are two different possible options which are propositionally, but not definitionally equal. For now, we emit a warning to this effect instead. A future PR may remove it (and infer one of these variants): see [zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Differential.20geometry.20elaborators.20experiment/near/544942546).
This PR completes an important milestone: models with corners are now inferred for *all* instances mathlib knows about! Update the module doc-string accordingly.
A future PR will golf mathlib using these elaborators.
---
- [x] depends on: #30744
- [x] depends on: #30879
[](https://gitpod.io/from-referrer/)
|
t-differential-geometry
t-meta
help-wanted
|
538/76 |
Mathlib/Geometry/Manifold/Notation.lean,MathlibTest/DifferentialGeometry/Notation.lean,MathlibTest/DifferentialGeometry/NotationAdvanced.lean,MathlibTest/DifferentialGeometry/NotationSphere.lean |
4 |
14 |
['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'thorimur'] |
thorimur assignee:thorimur |
3-64790 3 days ago |
unknown |
unknown |
| 14739 |
urkud author:urkud |
feat(Measure): add `gcongr` lemmas |
---
[](https://gitpod.io/from-referrer/) |
WIP
t-measure-probability
merge-conflict
awaiting-author
help-wanted
|
12/8 |
Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/Probability/Kernel/Disintegration/Density.lean |
5 |
4 |
['GrigorenkoPV', 'github-actions', 'kim-em', 'urkud'] |
nobody |
0-8519 2 hours ago |
unknown |
unknown |
| 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 |
| 24823 |
eric-wieser author:eric-wieser |
refactor: add `hom` lemmas for the `MonoidalCategory` structure on `ModuleCat` |
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-algebra
label:t-algebra$ |
148/164 |
Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Generator.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/Rep.lean |
11 |
21 |
['101damnations', 'YaelDillies', 'eric-wieser', 'github-actions', 'joelriou', 'kbuzzard', 'leanprover-community-bot-assistant'] |
101damnations assignee:101damnations |
214-28036 6 months ago |
214-28036 214 days ago |
25-46309 25 days |
| 25988 |
Multramate author:Multramate |
refactor(AlgebraicGeometry/EllipticCurve/*): replace Fin 3 with products |
This PR continues the work from #24593.
Original PR: https://github.com/leanprover-community/mathlib4/pull/24593 |
merge-conflict
t-algebraic-geometry
|
1000/1022 |
Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean |
6 |
3 |
['Multramate', 'github-actions', 'leanprover-community-bot-assistant'] |
nobody |
214-27478 6 months ago |
unknown |
unknown |
| 26067 |
mapehe author:mapehe |
feat(Topology/StoneCech): exists_continuous_surjection_from_StoneCech_to_dense_range |
This lemma formalises the following version of the maximality property of the Stone–Čech compactification: If `f : α → β` is a continuous map from a topological space `α` to a Hausdorff space `β` with dense range, then there exists a continuous surjection from `StoneCech α` to `β` extending `f`. In particular, `StoneCech α` is the “largest” compact Hausdorff space into which `α` densely embeds, in the sense that any other such space is a continuous image of it.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-topology
|
18/0 |
Mathlib/Topology/StoneCech.lean |
1 |
2 |
['github-actions', 'leanprover-community-bot-assistant'] |
nobody |
211-8856 6 months ago |
211-8856 211 days ago |
20-8050 20 days |
| 9820 |
jjaassoonn author:jjaassoonn |
feat(RingTheory/GradedAlgebra/HomogeneousIdeal): generalize to homogeneous submodule |
The definitions, constructions and theorems in `HomogeneousIdeal.lean` are generalized to a homogeneous submodules.
So say $R$ is a ring and $M \cong \bigoplus_{i} M_i$ is an $R$-module. Then a homogeneous $R$-submodule of $M$ is an $R$-submodule $N$ such that for all $i$ and $n \in N$, $n_i \in N$. Note that this notion doesn't actually require $R$ to be graded and $M$ is a graded module. But for more interesting lemmas, we do need that $M$ is graded $R$-module. We bake the fact $R$ is graded into the definition of homogeneous submodule, otherwise, `CompleteLattice HomogeneousSubmodule` cannot find the order of synthesis (the proof depends on that $R$ is graded)
All definitions/constructions/theorems have a copy for ideals as well, this is to make sure dot notation still works.
The motivation of this generalization is graded quotient module
---
- [ ] depends on:#18728
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-ring-theory
|
516/185 |
Mathlib/Algebra/Module/GradedModule.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,scripts/nolints_prime_decls.txt |
7 |
3 |
['github-actions', 'leanprover-community-bot-assistant'] |
nobody |
183-8040 5 months ago |
unknown |
unknown |
| 26200 |
adomani author:adomani |
fix: add label when landrun fails |
Adds the `permission-denied` label on PRs that get blocked by landrun.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
CI
|
68/8 |
.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml |
4 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
182-43471 5 months ago |
182-43471 182 days ago |
46-51722 46 days |
| 27451 |
kckennylau author:kckennylau |
feat(RingTheory/Valuation): define ball, closed ball, and sphere |
*From the 2025 Local Class Field Theory Workshop.*
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-ring-theory
|
27/0 |
Mathlib/RingTheory/Valuation/Basic.lean |
1 |
13 |
['JovanGerb', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky', 'wwylele'] |
nobody |
176-75974 5 months ago |
176-75975 176 days ago |
17-51735 17 days |
| 27987 |
kckennylau author:kckennylau |
feat(RingTheory/Valuation): define ball, closed ball, and sphere |
---
The pullback PR of #26827 and #27451.
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-ring-theory
large-import
|
73/0 |
Mathlib/RingTheory/Valuation/Basic.lean |
1 |
4 |
['JovanGerb', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot'] |
nobody |
176-75603 5 months ago |
176-75604 176 days ago |
6-5823 6 days |
| 27003 |
eric-wieser author:eric-wieser |
chore: use `Simp.ResultQ` more often |
Also uses `~q` in place of manual `isDefEq` matching.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-meta
|
18/22 |
Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/NormNum/Result.lean,Mathlib/Tactic/ReduceModChar.lean |
3 |
7 |
['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot'] |
JovanGerb assignee:JovanGerb |
175-3827 5 months ago |
175-3828 175 days ago |
32-67299 32 days |
| 28622 |
alreadydone author:alreadydone |
chore(Mathlib): replace `=>` by `↦` |
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict |
51792/51792 |
Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Hom/Rat.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Rat.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Spectrum/Pi.lean,Mathlib/Algebra/Algebra/Spectrum/Quasispectrum.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Centralizer.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/Algebra/Subalgebra/IsSimpleOrder.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Matrix.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Subalgebra/Prod.lean,Mathlib/Algebra/Algebra/Subalgebra/Unitization.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/AlgebraicCard.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Finsupp/Fin.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/Finset/Sigma.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/Limits.lean,Mathlib/Algebra/Category/AlgCat/Monoidal.lean,Mathlib/Algebra/Category/BialgCat/Basic.lean,Mathlib/Algebra/Category/BoolRing.lean,Mathlib/Algebra/Category/CoalgCat/Basic.lean,Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/Algebra/Category/FGModuleCat/Limits.lean,Mathlib/Algebra/Category/Grp/AB.lean,Mathlib/Algebra/Category/Grp/Adjunctions.lean,Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/Grp/Biproducts.lean,Mathlib/Algebra/Category/Grp/CartesianMonoidal.lean,Mathlib/Algebra/Category/Grp/Colimits.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/Grp/FilteredColimits.lean,Mathlib/Algebra/Category/Grp/Images.lean,Mathlib/Algebra/Category/Grp/Kernels.lean,Mathlib/Algebra/Category/Grp/LargeColimits.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/Grp/Limits.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Category/Grp/ZModuleEquivalence.lean,Mathlib/Algebra/Category/Grp/Zero.lean,Mathlib/Algebra/Category/GrpWithZero.lean,Mathlib/Algebra/Category/HopfAlgCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Biproducts.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/Images.lean,Mathlib/Algebra/Category/ModuleCat/Injective.lean,Mathlib/Algebra/Category/ModuleCat/Kernels.lean,Mathlib/Algebra/Category/ModuleCat/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Abelian.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafify.lean,Mathlib/Algebra/Category/ModuleCat/Products.lean |
3838 |
4 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
168-48503 5 months ago |
168-48504 168 days ago |
0-55389 15 hours |
| 28626 |
alreadydone author:alreadydone |
chore(Archive, Counterexamples): replace => by ↦ |
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict |
288/288 |
Archive/Arithcc.lean,Archive/Examples/IfNormalization/Result.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Archive/Examples/PropEncodable.lean,Archive/Imo/Imo1959Q1.lean,Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q4.lean,Archive/Imo/Imo1972Q5.lean,Archive/Imo/Imo1977Q6.lean,Archive/Imo/Imo1981Q3.lean,Archive/Imo/Imo1987Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo1998Q2.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2006Q5.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q3.lean,Archive/Imo/Imo2013Q1.lean,Archive/Imo/Imo2019Q1.lean,Archive/Imo/Imo2024Q5.lean,Archive/MiuLanguage/Basic.lean,Archive/MiuLanguage/DecisionSuf.lean,Archive/OxfordInvariants/Summer2021/Week3P1.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/AscendingDescendingSequences.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BirthdayProblem.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/Konigsberg.lean,Archive/Wiedijk100Theorems/Partition.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Archive/ZagierTwoSquares.lean,Counterexamples/AharoniKorman.lean,Counterexamples/CanonicallyOrderedCommSemiringTwoMul.lean,Counterexamples/CharPZeroNeCharZero.lean,Counterexamples/CliffordAlgebraNotInjective.lean,Counterexamples/DirectSumIsInternal.lean,Counterexamples/GameMultiplication.lean,Counterexamples/Girard.lean,Counterexamples/HomogeneousPrimeNotPrime.lean,Counterexamples/MapFloor.lean,Counterexamples/MonicNonRegular.lean,Counterexamples/Phillips.lean,Counterexamples/Pseudoelement.lean,Counterexamples/QuadraticForm.lean,Counterexamples/SorgenfreyLine.lean,Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean |
54 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
166-77629 5 months ago |
166-77630 166 days ago |
2-46227 2 days |
| 28150 |
Equilibris author:Equilibris |
chore: clean up proofs typevec proofs |
While adding variable universe corecs I found a lot of theorems in typevec that could do with a bit of a clean-up
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-data
new-contributor
|
24/26 |
Mathlib/Data/TypeVec.lean |
1 |
7 |
['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
165-44945 5 months ago |
165-44946 165 days ago |
13-47613 13 days |
| 27403 |
MoritzBeroRoos author:MoritzBeroRoos |
fix: replace probably erroneous usage of ⬝ (with old \cdot) by · (with \centerdot) |
Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot).
Currently the abbreviations \cdot and \centerdot resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for center..).
This pr replaces instances of ⬝ where · was probably meant.
All of the replacement is in comments, except for the file bench_summary.lean which is used for priting the github benchmark results. Since this file is about scientific notation of numbers, sure · was meant to be used, not a rectangle.
[Related](https://github.com/leanprover-community/mathlib4/pull/27399)
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
new-contributor
|
195/195 |
Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/DirectSum/Idempotents.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/Normed/Unbundled/InvariantExtension.lean,Mathlib/Analysis/SpecialFunctions/Complex/CircleAddChar.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/FieldTheory/PurelyInseparable/PerfectClosure.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/NumberTheory/SiegelsLemma.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Instances/Matrix.lean,scripts/bench_summary.lean |
49 |
5 |
['eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant'] |
nobody |
165-24265 5 months ago |
188-187 187 days ago |
7-51497 7 days |
| 28042 |
kckennylau author:kckennylau |
feat(Topology/ValuativeRel): a topological basis indexed by pairs of elements |
---
The pullback PR of #27314 and #27163.
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-ring-theory
|
140/23 |
Mathlib/RingTheory/Valuation/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean |
2 |
3 |
['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot'] |
nobody |
165-24219 5 months ago |
174-75663 174 days ago |
7-2766 7 days |
| 27399 |
MoritzBeroRoos author:MoritzBeroRoos |
chore: replace every usage of ⬝ᵥ (with old \cdot) by ·ᵥ (with \centerdot) |
Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot).
Currently the abbreviations `\cdot` and `\centerdot` resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for `center`..):
- `\cdot` gives ⬝ [U+2B1D](https://www.compart.com/en/unicode/U+2B1D) "Black Very Small Square"
- `\centerdot` gives · [U+00B7](https://www.compart.com/en/unicode/U+00B7) "Middle Dot"
Mathlib mostly uses the `\centerdot` variant, except for the dotProduct notation and some probably unsuspecting people wanting \centerdot but getting \cdot in their comments and 6 uses of a notation using the raw `\cdot` without any subscript at `Mathlib\Topology\Homotopy\Product.lean`.
This PR replaces the dot product `⬝ᵥ` with its `\centerdot` counterpart `·ᵥ`. The related PR [here](https://github.com/leanprover/vscode-lean4/pull/639) can then overwrite the `\cdot` abbreviation, to produce the same symbol as the `centerdot` abbreviation does.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
new-contributor
|
133/133 |
Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/Topology/Instances/Matrix.lean |
25 |
6 |
['MoritzBeroRoos', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant'] |
nobody |
164-72497 5 months ago |
188-188 187 days ago |
7-53541 7 days |
| 28148 |
kckennylau author:kckennylau |
feat(Matrix): Simproc and Rw-proc for Matrix Transpose |
Co-authored by Aaron Liu.
```lean
example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by
rw [transpose_of% 2 3]
example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by
rw [transpose_of]
example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by
simp only [matrix_transpose]
```
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-meta
|
267/8 |
Mathlib.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/LinearAlgebra/UnitaryGroup.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/Matrix.lean,MathlibTest/Simproc/Matrix.lean,MathlibTest/matrix.lean,scripts/noshake.json |
8 |
32 |
['eric-wieser', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'plp127'] |
eric-wieser assignee:eric-wieser |
160-29431 5 months ago |
160-29432 160 days ago |
12-66568 12 days |
| 27566 |
wwylele author:wwylele |
feat(Data/Real): Archimedean.embedReal is a ring hom when M is an ordered ring |
Also shows that this ends up the same as `LinearOrderedField.inducedOrderRingHom` for fields
---
This is a spin-off from #27268 ~~because I got bored~~ . This is not in a high priority as I don't need it for anything yet, but the last lemma shows that `embedReal` is a generalization of `LinearOrderedField.inducedOrderRingHom` (which is only stated for field, and I didn't find when I was making the group embedding). Perhaps we should refactor `Mathlib/Algebra/Order/CompleteField.lean` with the definition here. Indeed, if we replace every `ℝ` with `(R : Type*)[ConditionallyCompleteLinearOrderedField R]` in `Data/Real/Embedding.lean`, the proof still works. What do you think?
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-data
large-import
|
220/3 |
Mathlib/Data/Real/Embedding.lean |
1 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
151-22550 4 months ago |
151-22551 151 days ago |
40-31514 40 days |
| 26908 |
robin-carlier author:robin-carlier |
feat(CategoryTheory/Monoidal/DayConvolution): alternative ext principle for unitors |
Currently, our infrastructure for left/right unitors for Day convolution of functors `C ⥤ V` do not have satisfactory extensionality principle: the current way to characterize morphisms out of `U ⊛ F` is the default extensionality principle for Day convolution, which characterizes first such functors via functors out of `U ⊠ F`. Left unitors are then obtained using the fact `U ⊠ F` is a left Kan extension of a functor from `PUnit × C` (which is equivalent to `C`) but we did not record on its own this principle.
Using the transitivity of left Kan extensions proved in #26899, we directly exhibit `U ⊛ F` as a left Kan extension of `F ⋙ tensorLeft (𝟙_ V)` along `tensorLeft (𝟙_ C)`. The unit of this Kan extension is composed exactly of the morphisms that appear in the [characterization of left unitors](https://leanprover-community.github.io/mathlib4_docs/Mathlib/CategoryTheory/Monoidal/DayConvolution.html#CategoryTheory.MonoidalCategory.DayConvolutionUnit.leftUnitor_hom_unit_app).
We also slightly generalize the instances that express that external products with unitors are left Kan extensions, so that they can be used when taking external products with more complicated functors than currently. This is again useful when chaining extensionality lemmas for morphisms out of terms of the form `(F ⊛ U) ⊛ G`.
We prove a similar thing for right unitors
With this, it should be possible to have a much more satisfactory way of working with Day convolutions: this allows to "elimiinate" units without ending up with terms in an external product.
---
- [ ] depends on: #26899
- [ ] depends on: #26906
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-category-theory
|
307/18 |
Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean |
2 |
4 |
['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
148-75777 4 months ago |
148-75778 148 days ago |
0-1051 17 minutes |
| 27150 |
robin-carlier author:robin-carlier |
feat(CategoryTheory/Monoidal/DayConvolution): constructors for braided and symmetric structure on day convolutions monoidal categories |
Following the pattern in #27119, we give API to construct `BraidedCategory` and `SymmetricCategory` structures on a monoidal
category equipped with a `LawfulDayConvolutionMonoidalCategoryStruct`. To achieve this, we introduce an other type class
`LawfulDayConvolutionBraidedCategoryStruct` that bundles an associator isomorphism that behaves like the one constructed for functors in #27067.
We provide a noncomputable constructor for this typeclass that takes as input fullness of the "realization" functor to a category of functors, and we show that the typeclasses are sufficient to define the desired structures.
---
- [x] depends on: #27067
- [x] depends on: #26820
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-category-theory
|
826/9 |
Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean |
2 |
5 |
['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
148-70816 4 months ago |
204-14518 204 days ago |
0-51 51 seconds |
| 27119 |
robin-carlier author:robin-carlier |
feat(CategoryTheory/Monoidal/DayConvolution): constructors for closed monoidal day convolution monoidal structures |
Following the pattern introduced in #26798 and #26820 and using results of #26879, we introduce a typeclass
`LawfulDayConvolutionClosedMonoidalCategoryStruct` that encodes the data needed on a `LawfulDayConvolutionMonoidalCategoryStruct` to define well-behaved internal homs. We give a constructor assuming existence of relevant ends, and prove that this data defines a `MonoidalClosed` instance on the monoidal category structures one can deduce from `LawfulDayConvolutionMonoidalCategoryStruct`.
---
- [x] depends on: #27079
- [x] depends on: #27091
- [x] depends on: #26879
- [x] depends on: #26820
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-category-theory
|
900/9 |
Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Closed.lean |
2 |
6 |
['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
147-84667 4 months ago |
unknown |
unknown |
| 28623 |
gilesgshaw author:gilesgshaw |
feat(Logic/Basic): minor additions and simplification of proofs |
Add new theorems and simplify proofs.
Specifically, we add the family of related theorems `apply_dite_iff_exists`, `apply_dite_iff_forall`, `apply_ite_iff_and` and `apply_ite_iff_or`.
For each other 'family' of theorems in the file that is analogous to the above, we do the following
- Simplify proofs where possible, e.g. by appealing to the new theorems
- Complete the family, if any of the corresponding four are missing
- Rename to ensure consistency with the above pattern
---
|
merge-conflict
t-logic
new-contributor
|
83/55 |
Archive/Examples/IfNormalization/Result.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Notation/Indicator.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/Logic/Basic.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean,Mathlib/SetTheory/Ordinal/Notation.lean |
9 |
12 |
['eric-wieser', 'gilesgshaw', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127'] |
awainverse assignee:awainverse |
147-78528 4 months ago |
147-78529 147 days ago |
10-53273 10 days |
| 27933 |
grunweg author:grunweg |
chore(OrdNode): format code example in code blocks |
Wrap them in code blocks (and unindent them; that indentation is not needed any more).
This also avoids warnings from the linter in #27898.
-------
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-data
|
459/212 |
Mathlib/Data/Ordmap/Ordnode.lean |
1 |
4 |
['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot'] |
nobody |
144-29161 4 months ago |
144-29162 144 days ago |
39-68381 39 days |
| 26154 |
ADedecker author:ADedecker |
refactor: add refactored APIs for algebraic filter bases |
This PR continues the work from #18437.
Original PR: https://github.com/leanprover-community/mathlib4/pull/18437 |
merge-conflict
t-topology
|
651/0 |
Mathlib.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean |
5 |
3 |
['ADedecker', 'github-actions', 'mathlib4-merge-conflict-bot'] |
PatrickMassot assignee:PatrickMassot |
142-4372 4 months ago |
142-4373 142 days ago |
87-78694 87 days |
| 29330 |
plp127 author:plp127 |
chore: define `Fin.cycleIcc` with conditions |
Redefine `Fin.cycleIcc` using conditionals instead of composing existing `Fin` operations together. Its worst-case runtime drops from O(n) to O(1). As a bonus, the definition no longer needs explaining.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-group-theory
|
61/68 |
Mathlib/GroupTheory/Perm/Fin.lean |
1 |
10 |
['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'tb65536'] |
nobody |
133-15969 4 months ago |
133-15970 133 days ago |
19-72402 19 days |
| 27214 |
robin-carlier author:robin-carlier |
feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): Categorical pullback squares |
In this PR, we give the definition and first basic properties of categorical pullback squares.
Using our previous work on `CategoricalPullback`, we define a typeclass `CatPullbackSquare T L R B` that asserts that a given `CatCommSq T L R B` is a "pullback square": this is the data of a chosen adjoint equivalence to the canonical functor from the top left corner of the square to the categorical pulback of its leg. Using this equivalence, be derive a universal property for functors from `X`with values in the top left corner of the square: they are equivalent to `CatCommSqOver R B X`, the category of categorical commutative squares over the cospan `R, B` with top left corner `X`.
We prove some coherence result for this equivalence, most notably an isomorphism that, given `S : CatCommSqOver R B X`, bundles the two commutative triangles formed by the induced functor, and the coherence between the squares that these isomorphisms satisfy: this is conveniently bundled in the data of a single isomorphisms of `CatCommSqOver R B X`.
Finally, we provide a `Prop`-class `IsCatPullbackSquare` that merely asserts the existence (via `Nonempty`) of the relevant data: we show that it is tautotogically equivalent to the propopsition that the canonical functor to the categorical pullback is an equivalence.
---
- [ ] depends on: #26679
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-category-theory
|
786/1 |
Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean |
3 |
3 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
127-67561 4 months ago |
127-67562 127 days ago |
0-4044 1 hour |
| 26466 |
robin-carlier author:robin-carlier |
feat(AlgebraicTopology/SimplexCategory/Augmented): the canonical monoid object in the augmented simplex category |
Show that in the augmented simplex category, `⦋0⦌` is an internal monoid object.
Future work will show that this is in fact the universal monoid object: for any monoidal category `C`, evaluation at `⦋0⦌` induces an equivalence of categories between `Mon_ C` and the category of monoidal functors from `AugmentedSimplexCategory` to `C`. The resulting augmented cosimplicial object one gets from this construction is sometimes called the "monoidal bar construction" attached to a monoid.
This PR was split from #25743.
---
- [ ] depends on: #25743
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-algebraic-topology
t-category-theory
|
571/111 |
Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Mon_.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Monoidal.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean |
6 |
4 |
['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
127-563 4 months ago |
222-7847 222 days ago |
0-1046 17 minutes |
| 26578 |
robin-carlier author:robin-carlier |
feat(CategoryTheory/Limits/Pullbacks/Categorical/CatCospanTransform): adjunctions of categorical cospans |
We build upon the bicategory-like structure developed in #26447 and #26412 to define the notion of adjunctions of categorical cospans. This is a structure encoding the data of two `CatCospanTransform`s, along with the usual unit and counit morphisms as part of the data, satisfying the usual left and right triangle identities. We provide basic API for these, such as extracting adjunctions between individual components. We also provide a proof that the notion satisfies a "coherence": with our chosen constructor, the forward direction of the structure `CatCommSq` on the left adjoints correspond to the inverse of the square for the right adjoints through `mateEquiv`.
These adjunctions will be used as a substrate for defining equivalences of categorical cospans in a future PR: such an equivalence will be a structure extending a `CatCospanAdjunction` with isomorphisms data on the unit and co-unit (we will however provide alternative constructors in sync with the constructor for equivalences of categories).
---
- [x] depends on: #26447
- [x] depends on: #26547
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-category-theory
large-import
|
205/0 |
Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean |
1 |
5 |
['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
126-3788 4 months ago |
unknown |
unknown |
| 27990 |
kckennylau author:kckennylau |
feat(Counterexamples): a nontrivial valuation with discrete topology |
This file constructs a valuation on `K[X]` satisfying `IsValuativeTopology K[X] ∧ Nonempty (valuation K[X]).RankOne ∧ IsNontrivial K[X] ∧ DiscreteTopology K[X]`, and proves that `IsValuativeTopology F ∧ IsNontrivial F ∧ DiscreteTopology F` is not possible if `F` is a field.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-ring-theory
|
172/0 |
Counterexamples.lean,Counterexamples/DiscreteTopologyWithNontrivialValuation.lean |
2 |
14 |
['github-actions', 'grunweg', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky'] |
nobody |
114-74034 3 months ago |
114-74035 114 days ago |
67-78029 67 days |
| 25978 |
Bergschaf author:Bergschaf |
feat(Order/Sublocale): Open Sublocales |
---
[](https://gitpod.io/from-referrer/)
- [x] depends on: #25089 |
merge-conflict
t-order
|
377/8 |
Mathlib.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/Nucleus.lean,Mathlib/Order/Sublocale.lean,Mathlib/Order/Synonym.lean,docs/references.bib |
6 |
3 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
103-62890 3 months ago |
176-20766 176 days ago |
0-1326 22 minutes |
| 28132 |
dupuisf author:dupuisf |
feat: preliminary `grind` tags for `IsUnit` |
This PR adds preliminary `grind` tags for the `IsUnit` predicate.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-algebra
label:t-algebra$ |
61/17 |
Mathlib/Algebra/Group/Action/Units.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Ring/Units.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean |
6 |
3 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
kim-em assignee:kim-em |
91-50632 2 months ago |
91-50633 91 days ago |
80-71574 80 days |
| 26827 |
pechersky author:pechersky |
feat(Analysis/Normed/ValuativeRel): helper instance for NormedField |
---
[](https://gitpod.io/from-referrer/)
- [x] depends on: #26713
- [x] depends on: #26826
|
merge-conflict
t-algebra
t-number-theory
t-analysis
label:t-algebra$ |
211/27 |
Mathlib.lean,Mathlib/Analysis/Normed/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean |
3 |
34 |
['ADedecker', 'adamtopaz', 'erdOne', 'github-actions', 'kbuzzard', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky'] |
kbuzzard assignee:kbuzzard |
83-79236 2 months ago |
83-79236 83 days ago |
121-75550 121 days |
| 24850 |
pechersky author:pechersky |
feat(Topology/UniformSpace/Ultra): uniform spaces induced by pseudometrics are ultra if system is ultra |
Any uniform space has a natural system of pseudometrics definable on it,
comprised of those pseudometrics constructed from a descending chain of
equivalence relation entourages. In a nonarchimedean uniformity, this pseudometric system
induces the uniformity.
---
[](https://gitpod.io/from-referrer/)
- [x] depends on: #23111 |
merge-conflict
t-topology
|
509/1 |
Mathlib.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/UniformSpace/Ultra/Pseudometrizable.lean |
3 |
9 |
['ADedecker', 'fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky'] |
urkud assignee:urkud |
77-15323 2 months ago |
77-15324 77 days ago |
162-10999 162 days |
| 25974 |
scholzhannah author:scholzhannah |
feat(Topology/Compactness/CompactlyCoherentSpace): compact coherentification (k-ification) |
This PR defines the notion of turning an arbitrary topological space into a compactly coherent space. Compactly coherent spaces are commonly referred to as "compactly generated spaces" or "k-spaces" in the literature while the operation of turning a space into such as space is called the "k-ification". There are however three different notions that are described with this name. To disambiguate we use the names "compactly coherent space" and "compactcoherentification" here. See [this wikipedia page](https://en.wikipedia.org/wiki/Compactly_generated_space) for an explanation of these notions.
This PR continues the work from #25318.
Original PR: https://github.com/leanprover-community/mathlib4/pull/25318
Co-authored-by: Floris van Doorn |
merge-conflict
t-topology
large-import
|
174/5 |
Mathlib/Topology/Compactness/CompactlyCoherentSpace.lean |
1 |
5 |
['github-actions', 'joelriou', 'mathlib4-merge-conflict-bot', 'scholzhannah'] |
ADedecker assignee:ADedecker |
77-15155 2 months ago |
77-15156 77 days ago |
147-61529 147 days |
| 26914 |
quangvdao author:quangvdao |
feat(Data/PFunctor/Univariate): more definitions for univariate `PFunctor` |
This PR defines several basic definitions of `PFunctor`, including zero, one, constants, monomials, coproduct (sum), product, sigma, pi, tensor product, universe lifting, and equivalence.
We also add: (1) simple lemmas connecting the basic definitions, (2) an automatically derived ext lemma for `PFunctor` via `@[ext]` attribute
Some things I'm not clear on:
- I define `HAdd` and `HMul` instances for coproduct and product of poly functors having different universe levels. Should I also define `Add` and `Mul` instances for poly functors having the same universe level?
- Is it ok to define notation for tensor product, i.e. `@[inherit_doc] scoped infixr:80 " ⊗ " => tensor`? I'm worried it might clash with other notation.
- Need a double-check on the priority of notation.
Some future definitions to add:
- Various equivalences arising from arithmetic identities, e.g., `P + 0 ≃ₚ P`.
- Definitions of Lenses and Charts (each of them will be a file or even a folder)
- Exponential objects (corresponding to both `prod` and `tensor`)
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-data
|
144/5 |
Mathlib/Data/PFunctor/Univariate/Basic.lean |
1 |
20 |
['alexkeizer', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'quangvdao'] |
eric-wieser assignee:eric-wieser |
77-14801 2 months ago |
77-14802 77 days ago |
133-15886 133 days |
| 27534 |
PierreQuinton author:PierreQuinton |
feat: a typeclass for `sSup`/`sInf` to be lawful |
Adds lawful infima and suprema type classes.
A preorder with lawful suprema: whenever a set has a least upper bound, `sSup` returns a least upper bound for that set.
A preorder with lawful infima: whenever a set has a greatest lower bound, `sInf` returns a greastest lower bound for that set.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-order
|
121/8 |
Mathlib.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/LawfulSupInf.lean |
3 |
26 |
['PierreQuinton', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp'] |
YaelDillies assignee:YaelDillies |
77-14638 2 months ago |
77-14639 77 days ago |
114-33795 114 days |
| 28125 |
nonisomorphiclinearmap author:nonisomorphiclinearmap |
feat(Combinatorics): basic definition of simplicial complexes |
This PR introduces the basic definition of a finite (abstract) simplicial complex, located in Mathlib/Combinatorics/SimplicialComplex/Basic.lean.
---
This is our first contribution to mathlib. This work was done as part of the Fields Institute Summer Undergraduate Program on formalization in topological combinatorics. Eventually, we aim to formalize Lovasz's proof of the Kneser Conjecture and this is a small stepping stone in that direction. Some other commits will shortly depend on this one.
We would like to acknowledge the Fields Institute for Research in Mathematical Sciences for their sponsorship. We would also like to thank our supervisors, Professor Chris Kapulkin and Mr. Daniel Carranza, for their guidance and support throughout this project. We would also like to thank our group members Tom Lindquist and Quang Minh Nguyen for our fruitful discussions. |
merge-conflict
t-combinatorics
new-contributor
|
374/0 |
Mathlib.lean,Mathlib/Combinatorics/SimplicialComplex/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Category.lean,Mathlib/Combinatorics/SimplicialComplex/FacePoset.lean,Mathlib/Combinatorics/SimplicialComplex/Hom.lean |
5 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
awainverse assignee:awainverse |
77-14496 2 months ago |
77-14497 77 days ago |
99-48372 99 days |
| 28871 |
JaafarTanoukhi author:JaafarTanoukhi |
feat(Combinatorics/Digraph): Tournaments |
Define orientations and tournaments. Related to #26771.
Co-authored-by: Rida Hamadani
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-combinatorics
new-contributor
|
62/0 |
Mathlib.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Digraph/Tournament.lean |
3 |
6 |
['JaafarTanoukhi', 'Rida-Hamadani', 'SnirBroshi', 'github-actions', 'mathlib4-merge-conflict-bot'] |
kmill assignee:kmill |
77-14343 2 months ago |
77-14344 77 days ago |
71-35799 71 days |
| 29526 |
llllvvuu author:llllvvuu |
feat: `Multiset.map f` identifies `f` up to permutation |
Motivation: Reason about `Fintype`-indexed families via `Multiset` equality.
Example use case 1:
```lean
theorem Matrix.IsHermitian.cfc_eigenvalues {d : Type*} [Fintype d] [DecidableEq d]
{M : Matrix d d 𝕜} (hM : M.IsHermitian) (f : ℝ → ℝ)
(hcfc : Matrix.IsHermitian (cfc f M) := cfc_predicate f M) :
∃ (e : d ≃ d), hcfc.eigenvalues = f ∘ hM.eigenvalues ∘ e := by
have := hcfc.roots_charpoly_eq_eigenvalues.symm
rw [hM.charpoly_cfc_eq f, Polynomial.roots_prod] at this; swap
· simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero]
simp_rw [Polynomial.roots_X_sub_C, Multiset.bind_singleton] at this
have he := (Multiset.compTriple_equivOfMapUnivEq this).comp_eq
simp_rw [← Function.comp_def RCLike.ofReal, ← Function.comp_def f, Function.comp_assoc] at he
exact ⟨_, RCLike.ofReal_injective.comp_left he.symm⟩
```
Example use case 2 (on top of https://github.com/leanprover-community/mathlib4/pull/29610):
```lean
theorem LinearMap.Eigenbasis.μ_equiv {ι ι' R G : Type*} [Fintype ι] [Fintype ι']
[CommRing R] [IsDomain R] [AddCommGroup G] [Module R G] [Module.Free R G] [Module.Finite R G]
{f : Module.End R G} (B₁ : f.Eigenbasis ι) (B₂ : f.Eigenbasis ι') :
∃ e : ι ≃ ι', B₁.μ = B₂.μ ∘ e := by
classical
have := congr(Polynomial.roots $(B₁.charpoly_eq.symm.trans B₂.charpoly_eq))
rw [Polynomial.roots_prod, Polynomial.roots_prod] at this; rotate_left
· simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero]
· simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero]
simp_rw [Polynomial.roots_X_sub_C, Multiset.bind_singleton] at this
exact ⟨Multiset.equivOfMapUnivEq this, (Multiset.compTriple_equivOfMapUnivEq this).comp_eq.symm⟩
```
Co-authored-by: Aristotle Harmonic
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-data
|
35/0 |
Mathlib/Data/Multiset/Fintype.lean |
1 |
9 |
['Ruben-VandeVelde', 'github-actions', 'llllvvuu', 'mathlib4-merge-conflict-bot', 'vihdzp', 'wwylele'] |
pechersky assignee:pechersky |
77-14305 2 months ago |
77-14306 77 days ago |
69-16483 69 days |
| 29947 |
JaafarTanoukhi author:JaafarTanoukhi |
feat(Combinatorics/Digraph): Maps |
Ported `SimpleGraph/Maps.lean` to `Digraph/Maps.lean` for future PRs related to issue #[26771](https://github.com/leanprover-community/mathlib4/issues/26771)
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-combinatorics
new-contributor
|
476/0 |
Mathlib.lean,Mathlib/Combinatorics/Digraph/Maps.lean |
2 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
awainverse assignee:awainverse |
77-13709 2 months ago |
77-13710 77 days ago |
54-81855 54 days |
| 30355 |
kckennylau author:kckennylau |
feat(Logic): graded functions |
This PR defines a class of graded functions, called `GradedFunLike`. It is intended to be used in #30312 to characterise a class of graded ring homomorphisms, where it is invoked as `[GradedFunLike F 𝒜 ℬ] [RingHomClass F A B]`.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-data
|
41/0 |
Mathlib.lean,Mathlib/Data/FunLike/Graded.lean |
2 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
77-13521 2 months ago |
77-13522 77 days ago |
40-71592 40 days |
| 31356 |
adomani author:adomani |
feat: add inspect-like functions |
Produces a tree-like formatting for `Syntax`, `Expr` and `InfoTree`. Especially for the `InfoTree`s, there are *many* parts of it that do not get printed.
For instance, this is how the `InfoTree`s of `set_option linter.missingDocs true` get printed:
```lean
inspectIT
set_option linter.missingDocs true
/-
commandCtx
|-Info.ofCommandInfo: Lean.Elab.Command.elabSetOption, 'set_option…gDocs true'
| |-Info.ofCompletionInfo.CompletionInfo.option 'set_option…issingDocs'
| |-Info.ofOptionInfo: linter.missingDocs, Linter.linter.missingDocs
-/
```
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-meta
|
720/0 |
Mathlib.lean,Mathlib/Util/Inspect.lean,MathlibTest/Inspect.lean |
3 |
3 |
['github-actions', 'mathlib4-merge-conflict-bot', 'plp127'] |
kim-em assignee:kim-em |
77-8730 2 months ago |
77-8731 77 days ago |
11-59965 11 days |
| 26890 |
robin-carlier author:robin-carlier |
feat(CategoryTheory/Monoidal/DayConvolution): more API for `DayFunctor` |
We provide some lemmas that helps characterizing the monoidal structure on `DayFunctor`, they are special cases of the lemmas for `LawfulDayConvolutionMonoidalCategoryStruct`.
---
- [x] depends on: #26824
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-category-theory
|
1372/19 |
Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean |
4 |
5 |
['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
76-73357 2 months ago |
unknown |
unknown |
| 29281 |
plp127 author:plp127 |
doc: `Fin.natAdd_castLEEmb` |
Change the docstring of `Fin.natAdd_castLEEmb` which confused me when I read it so I rewrote it.
PS. this doesn't really follow the naming convention since data should be in `camelCase`
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-data
|
2/3 |
Mathlib/Data/Fin/Embedding.lean |
1 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
76-73167 2 months ago |
135-83066 135 days ago |
18-35802 18 days |
| 26912 |
pechersky author:pechersky |
chore(Algebra/Ring/Subring): simp tag `Subring.smul_def` |
s-multiplying by a subtype is easiest to manipulate when both terms are in the ambient type. Many places that had to use the _def lemma for a rewrite, or to include it in a simp set, no longer have to.
Ported from #25308
---
[](https://gitpod.io/from-referrer/)
I found this being not-simp frustrating when talking about submodules over a valuation subring. |
merge-conflict
t-algebra
label:t-algebra$ |
67/66 |
Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Exact.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Ring/Periodic.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/LinearAlgebra/RootSystem/Irreducible.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/RingTheory/Etale/Kaehler.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/LocalProperties/Projective.lean,Mathlib/RingTheory/Localization/InvSubmonoid.lean,Mathlib/RingTheory/OreLocalization/Basic.lean |
25 |
26 |
['artie2000', 'eric-wieser', 'github-actions', 'j-loreaux', 'kckennylau', 'leanprover-bot', 'leanprover-radar', 'linesthatinterlace', 'mathlib4-merge-conflict-bot', 'pechersky'] |
joelriou assignee:joelriou |
50-46508 1 month ago |
71-82457 71 days ago |
60-49993 60 days |
| 33020 |
FormulaRabbit81 author:FormulaRabbit81 |
chore(Topology): Deprecate file |
---
- [ ] depends on: #30851 deprecation
[](https://gitpod.io/from-referrer/)
|
t-topology
large-import
merge-conflict
|
82/49 |
Mathlib/Topology/Compactness/HilbertCubeEmbedding.lean,Mathlib/Topology/MetricSpace/HausdorffAlexandroff.lean,Mathlib/Topology/MetricSpace/PiNat.lean |
3 |
3 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
48-26601 1 month ago |
48-26602 48 days ago |
0-13670 3 hours |
| 32918 |
michelsol author:michelsol |
feat: define `supEdist` and `supDist` |
Create a new file Topology.MetricSpace.SupDistance and define the supremal distance in (extended) metric spaces. The defined `supEdist` and `supDist` will have similar theory to the already existing `infEdist` and `infDist`. The motivation is to be able to define the radius of a minimal bounding sphere as the infimum of the supDist later.
[zulip discussion here](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Formalizing.20Jung's.20theorem.20and.20minimal.20bounding.20spheres) |
t-topology
new-contributor
merge-conflict
|
75/0 |
Mathlib.lean,Mathlib/Topology/MetricSpace/SupDistance.lean |
2 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
RemyDegenne assignee:RemyDegenne |
29-56889 29 days ago |
29-56891 29 days ago |
21-957 21 days |
| 33561 |
kbuzzard author:kbuzzard |
chore: cont -> continuous_toFun |
This field is sometimes called `cont` and sometimes `continuous_toFun`. I noticed that the `continuity` tactic sometimes takes a lot longer to prove `cont` even if `continuous_toFun` is available so I thought I'd change them all to see if this speed up mathlib.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict |
171/149 |
Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Homology.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Polynomial.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/NonUnital.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Extend.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/DerivNotation.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Analysis/Fourier/FourierTransform.lean,Mathlib/Analysis/Fourier/LpSpace.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/LocallyConvex/Barrelled.lean,Mathlib/Analysis/LocallyConvex/PointwiseConvergence.lean,Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/Normed/Module/Alternating/Basic.lean,Mathlib/Analysis/Normed/Module/Multilinear/Basic.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/Analysis/RCLike/Extend.lean,Mathlib/Geometry/Euclidean/Incenter.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MFDeriv/Atlas.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Integral/Bochner/L1.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/NumberTheory/ModularForms/JacobiTheta/TwoVariable.lean,Mathlib/Probability/Distributions/Fernique.lean,Mathlib/Probability/Moments/CovarianceBilinDual.lean,Mathlib/Topology/Algebra/AffineSubspace.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/ContinuousAffineEquiv.lean,Mathlib/Topology/Algebra/ContinuousAffineMap.lean,Mathlib/Topology/Algebra/Module/Alternating/Basic.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean,Mathlib/Topology/Algebra/Module/LinearMapPiProd.lean,Mathlib/Topology/Algebra/Module/Multilinear/Basic.lean,Mathlib/Topology/Algebra/Module/Multilinear/Topology.lean,Mathlib/Topology/Algebra/Module/PointwiseConvergence.lean,Mathlib/Topology/Algebra/Module/Star.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,Mathlib/Topology/ContinuousMap/Algebra.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/Instances/TrivSqZeroExt.lean,Mathlib/Topology/VectorBundle/Basic.lean |
66 |
5 |
['eric-wieser', 'github-actions', 'kbuzzard', 'leanprover-radar', 'mathlib4-merge-conflict-bot'] |
nobody |
27-48583 27 days ago |
27-48584 27 days ago |
2-79879 2 days |
| 33330 |
michael-novak-math author:michael-novak-math |
feat: add arc-length reparametrization of parametrized curves |
add new definitions of arc-length reparametrization and its corresponding parameter transformation and a theorem establishing the desired properties. |
t-analysis
new-contributor
merge-conflict
|
311/0 |
Mathlib.lean,Mathlib/Analysis/Calculus/ArcLengthReparametrization.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,docs/references.bib,lake-manifest.json |
5 |
53 |
['SnirBroshi', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'michael-novak-math'] |
j-loreaux assignee:j-loreaux |
27-38443 27 days ago |
27-38444 27 days ago |
6-57754 6 days |
| 28700 |
Timeroot author:Timeroot |
feat(ModelTheory): Set.Definable is transitive |
---
This PR continues the work from #19695.
Original PR: https://github.com/leanprover-community/mathlib4/pull/19695
- [ ] depends on: #26332
[](https://gitpod.io/from-referrer/)
|
merge-conflict
large-import
t-logic
|
529/8 |
Mathlib/Data/Rel.lean,Mathlib/ModelTheory/Definability.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean,scripts/noshake.json |
5 |
8 |
['Timeroot', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'staroperator'] |
nobody |
26-75829 26 days ago |
164-53782 164 days ago |
3-938 3 days |
| 31595 |
astrainfinita author:astrainfinita |
chore: redefine `Ideal.IsPrime` |
Redefine `Ideal.IsPrime` to make it correct for non-commutative cases
---
[](https://gitpod.io/from-referrer/)
|
t-algebra
merge-conflict
label:t-algebra$ |
330/100 |
Mathlib/Algebra/Order/Ring/Ordering/Defs.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Basic.lean,Mathlib/RingTheory/Ideal/IsPrimary.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/Ideal/Oka.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Pointwise.lean,Mathlib/RingTheory/Ideal/Prime.lean,Mathlib/RingTheory/Ideal/Prod.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/Localization/Ideal.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/RingTheory/Valuation/Basic.lean |
22 |
29 |
['alreadydone', 'artie2000', 'astrainfinita', 'erdOne', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot'] |
alreadydone assignee:alreadydone |
22-84997 22 days ago |
24-57091 24 days ago |
28-50719 28 days |
| 33435 |
astrainfinita author:astrainfinita |
feat: algebra automorphisms of monoid algebras |
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-algebra
label:t-algebra$ |
53/3 |
Mathlib/Algebra/MonoidAlgebra/Basic.lean |
1 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
kbuzzard assignee:kbuzzard |
21-58496 21 days ago |
21-58497 21 days ago |
13-11452 13 days |
| 33126 |
CoolRmal author:CoolRmal |
feat: function composition preserves boundedness |
This PR adds the following theorem: if the range of a function `g` is bounded above, then `g ∘ f` is bounded above for
all functions `f`.
---
[](https://gitpod.io/from-referrer/)
|
t-order
merge-conflict
|
12/0 |
Mathlib/Order/Bounds/Basic.lean |
1 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
bryangingechen assignee:bryangingechen |
18-77360 18 days ago |
18-77361 18 days ago |
27-2736 27 days |
| 29587 |
uniwuni author:uniwuni |
feat(GroupTheory/Finiteness): define finitely generated semigroups |
We define finitely generated semigroups and basics similarly to monoids and groups and prove that semigroups and monoids remain finitely generated when a congruence is quotiented out. This will be important when further developing semigroup theory.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-group-theory
|
259/14 |
Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/GroupTheory/Finiteness.lean |
2 |
4 |
['github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'uniwuni'] |
dupuisf assignee:dupuisf |
17-2529 17 days ago |
119-7433 119 days ago |
25-73895 25 days |
| 32546 |
anishrajeev author:anishrajeev |
feat(ModelTheory): Prove compactness of the type space |
Define the space of types and prove various topological properties of it (zero dimensional, totally separated, compact, baire).
The goal is to formalize the proof of the Omitting Types Theorem
- [ ] depends on: #32215 |
merge-conflict
t-logic
new-contributor
|
127/1 |
Mathlib.lean,Mathlib/ModelTheory/Topology/Types.lean,Mathlib/ModelTheory/Types.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean |
4 |
6 |
['NoneMore', 'anishrajeev', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
fpvandoorn assignee:fpvandoorn |
14-68308 14 days ago |
unknown |
unknown |
| 29014 |
ShreckYe author:ShreckYe |
feat(Data/List/Scan): some theorems that relate `scanl` with `foldl` |
I am not sure which is the best form of `getElem_scanl_eq_foldl_take` here, so I added several alternative forms. Feel free to remove any of them if necessary. |
merge-conflict
t-data
|
35/0 |
Mathlib/Data/List/Scan.lean |
1 |
15 |
['ShreckYe', 'github-actions', 'mathlib4-merge-conflict-bot', 'themathqueen', 'vlad902'] |
pechersky assignee:pechersky |
12-68153 12 days ago |
86-33198 86 days ago |
74-48754 74 days |
| 29909 |
Vierkantor author:Vierkantor |
feat(CI): add build output to CI workflows |
This PR uses the Zulip build report script (originally developed for the nightly-regression-report workflow) to add a summary of build output to other Zulip posts about workflow results. This allows us to more easily see the origin of a failure. This requires redoing the script a little to make it a bit more flexible, and the output is slightly reformatted to become consistent across the various workflows (4 of them that post to Zulip).
We don't do so for the nightly-testing failures, since those run in a different workflow, and it would be a lot of work to access the command output from another workflow.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
CI
|
93/69 |
.github/workflows/daily.yml,.github/workflows/nightly-docgen.yml,.github/workflows/nightly-regression-report.yml,scripts/zulip_build_report.sh |
4 |
2 |
['github-actions', 'joneugster', 'mathlib4-merge-conflict-bot'] |
joneugster assignee:joneugster |
12-5040 12 days ago |
92-28942 92 days ago |
41-46786 41 days |
| 34188 |
vihdzp author:vihdzp |
feat: abbrev for `Std.Total (· ≤ ·)` |
Apart from saving keystrokes, this ensures that the totality condition gets dualized by `to_dual` to itself, rather than to the equivalent and less idiomatic `Std.Total (· ≥ ·)`.
---
[](https://gitpod.io/from-referrer/)
|
t-order
merge-conflict
|
67/58 |
Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Data/Char.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/Ordmap/Invariants.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Compare.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Filter/FilterProduct.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/PropInstances.lean,Mathlib/Order/Quotient.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/Shrink.lean,Mathlib/Order/UpperLower/CompleteLattice.lean,Mathlib/Order/WithBot.lean,Mathlib/RingTheory/Valuation/ValuationRing.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean |
21 |
8 |
['JovanGerb', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'plp127', 'vihdzp'] |
Vierkantor assignee:Vierkantor |
0-59108 16 hours ago |
0-59109 16 hours ago |
13-55952 13 days |
| 34649 |
peabrainiac author:peabrainiac |
feat(Analysis/Calculus/ContDiff): add notation `ℕ∞ω` for `WithTop ℕ∞` |
Add a `ContDiff`-scoped notation `ℕ∞ω` for `WithTop ℕ∞`, accompanying the existing notations `∞` and `ω` for `(⊤ : ℕ∞) : ℕ∞ω` and `⊤ : ℕ∞ω`.
---
I've also replaced `WithTop ℕ∞` with this new notation already in the files that mention it the most, but not in all files yet; many mention `WithTop ℕ∞` just a couple of times but don't open the `ContDiff` namespace. I'm not sure whether that should be taken as a sign to not make the notation scoped, or whether the solution is just to `open scoped ContDiff` in these files or not use the notation there.
[](https://gitpod.io/from-referrer/)
|
t-differential-geometry
t-analysis
merge-conflict
|
220/217 |
Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/CPolynomial.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/ImplicitContDiff.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Defs.lean,Mathlib/Analysis/Calculus/VectorField.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/InverseDeriv.lean,Mathlib/Geometry/Manifold/Algebra/LieGroup.lean,Mathlib/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/Manifold/Algebra/SmoothFunctions.lean,Mathlib/Geometry/Manifold/Algebra/Structures.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/Instances/UnitsOfNormedAlgebra.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/FiberwiseLinear.lean |
26 |
2 |
['github-actions', 'mathlib-merge-conflicts'] |
nobody |
0-59101 16 hours ago |
0-59101 16 hours ago |
3-22307 3 days |
| 29870 |
mckoen author:mckoen |
feat(CategoryTheory/Adhesive): subobjects in adhesive categories have binary coproducts |
Moves `Adhesive` to `Adhesive.Basic`, adds `Adhesive.Subobject`, and formalizes Theorem 5.1 in https://www.ioc.ee/~pawel/papers/adhesivejournal.pdf. Given `A B Z : C` with `C` adhesive, and `a : A ⟶ Z`, ` b : B ⟶ Z` monomorphisms, then `pushout.desc a b pullback.condition` is also a monomorphism. This result will be useful in showing that the pushout-product of monomorphisms is also a monomorphism.
---
- [ ] depends on: #34818
[](https://gitpod.io/from-referrer/)
|
t-category-theory
merge-conflict
|
504/331 |
Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/Subcomplex.lean,Mathlib/CategoryTheory/Adhesive.lean,Mathlib/CategoryTheory/Adhesive/Basic.lean,Mathlib/CategoryTheory/Adhesive/Subobject.lean,Mathlib/CategoryTheory/Limits/Types/Pushouts.lean,Mathlib/CategoryTheory/Sites/LeftExact.lean |
7 |
8 |
['github-actions', 'jcommelin', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mckoen'] |
dagurtomas assignee:dagurtomas |
0-16297 4 hours ago |
0-16298 4 hours ago |
5-70837 5 days |
| Number |
Author |
Title |
Description |
Labels |
+/- |
Modified files (first 100) |
📝 |
💬 |
All users who commented or reviewed |
Assignee(s) |
Updated |
Last status change |
total time in review |
| 14563 |
awueth author:awueth |
feat: if-then-else of exclusive or statement |
---
If `¬(P ∧ Q)` then `ite (P ∨ Q) a 1 = (ite P a 1) * (ite Q a 1)`
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-algebra
new-contributor
label:t-algebra$ |
5/0 |
Mathlib/Algebra/Group/Basic.lean |
1 |
3 |
['eric-wieser', 'github-actions', 'kim-em'] |
nobody |
538-5893 1 year ago |
unknown |
unknown |
| 12751 |
Command-Master author:Command-Master |
feat: add lemmas for Nat/Bits, Nat/Bitwise and Nat/Size |
Remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-data
new-contributor
|
66/7 |
Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Size.lean |
4 |
26 |
['Command-Master', 'Rida-Hamadani', 'Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'jcommelin'] |
nobody |
533-77202 1 year ago |
unknown |
unknown |
| 14669 |
Command-Master author:Command-Master |
feat(Data/Nat/PartENat): add lemmas for PartENat |
Add some missing lemmas for `PartENat`, as well as the additive homomorphism from it to `WithTop Int`.
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-data
new-contributor
|
90/0 |
Mathlib/Data/Nat/PartENat.lean |
1 |
3 |
['erdOne', 'github-actions', 'urkud'] |
nobody |
521-2692 1 year ago |
unknown |
unknown |
| 15121 |
Eloitor author:Eloitor |
feat: iff theorems for IsSplitEpi and IsSplitMono in opposite category |
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-category-theory
new-contributor
|
40/0 |
Mathlib/CategoryTheory/EpiMono.lean |
1 |
3 |
['github-actions', 'joelriou', 'mattrobball'] |
nobody |
520-52037 1 year ago |
unknown |
unknown |
| 14242 |
js2357 author:js2357 |
feat: Prove equivalence of `isDedekindDomain` and `isDedekindDomainDvr` |
Prove that `isDedekindDomainDvr` is equivalent to both `isDedekindDomain` and `isDedekindDomainInv`.
Specifically, prove `isDedekindDomainDvr A → isDedekindDomainInv A`, because `isDedekindDomain A → isDedekindDomainDvr A` and `IsDedekindDomain A ↔ IsDedekindDomainInv A` are already in Mathlib.
- [x] depends on: #14099
- [x] depends on: #14216
- [ ] depends on: #14237
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-algebra
blocked-by-other-PR
new-contributor
label:t-algebra$ |
269/1 |
Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Dvr.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean |
4 |
2 |
['github-actions', 'leanprover-community-mathlib4-bot'] |
nobody |
497-63096 1 year ago |
unknown |
unknown |
| 16887 |
metinersin author:metinersin |
feat(ModelTheory/Complexity): define conjunctive and disjunctive formulas |
Defines `FirstOrder.Language.BoundedFormula.IsConjunctive` and `FirstOrder.Language.BoundedFormula.IsDisjunctive`.
---
- [ ] depends on: #16885
[](https://gitpod.io/from-referrer/)
|
merge-conflict
blocked-by-other-PR
new-contributor
t-logic
|
300/7 |
Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean |
3 |
2 |
['github-actions', 'mathlib4-dependent-issues-bot'] |
nobody |
489-59074 1 year ago |
unknown |
unknown |
| 16888 |
metinersin author:metinersin |
feat(ModelTheory/Complexity): Define conjunctive and disjunctive normal forms |
Define `FirstOrder.Language.BoundedFormula.IsDNF` and `FirstOrder.Language.BoundedFormula.IsCNF`.
---
- [ ] depends on: #16887
[](https://gitpod.io/from-referrer/)
|
merge-conflict
blocked-by-other-PR
new-contributor
t-logic
|
415/7 |
Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean |
3 |
2 |
['github-actions', 'mathlib4-dependent-issues-bot'] |
nobody |
489-59074 1 year ago |
unknown |
unknown |
| 16889 |
metinersin author:metinersin |
feat(ModelTheory/Complexity): Normal forms |
Defines `FirstOrder.Language.BoundedFormula.toDNF` and `FirstOrder.Language.BoundedFormula.toCNF` - given a quantifier-free formula, these construct a semantically equivalent formula in disjunctive normal form and conjunctive normal form, respectively.
---
- [ ] depends on: #16888
[](https://gitpod.io/from-referrer/)
|
merge-conflict
blocked-by-other-PR
new-contributor
t-logic
|
525/7 |
Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean |
3 |
2 |
['github-actions', 'mathlib4-dependent-issues-bot'] |
nobody |
489-59073 1 year ago |
unknown |
unknown |
| 14619 |
Command-Master author:Command-Master |
chore: Merge `Trunc` to `Squash` |
Remove `Trunc` and use `Squash` instead
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
WIP
new-contributor
|
197/211 |
Mathlib/CategoryTheory/EpiMono.lean,Mathlib/CategoryTheory/Preadditive/Biproducts.lean,Mathlib/Data/DFinsupp/Basic.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Fintype/Option.lean,Mathlib/Data/Fintype/Perm.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Semiquot.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/Logic/Equiv/List.lean |
13 |
3 |
['Command-Master', 'github-actions', 'vihdzp'] |
nobody |
480-19224 1 year ago |
unknown |
unknown |
| 12750 |
Command-Master author:Command-Master |
feat: define Gray code |
---
Define binary reflected gray code, both as a permutation of `Nat` and as a permutation of `BitVec n`, and prove some theorems about them. Additionally, remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`.
- [ ] depends on: #12751
[](https://gitpod.io/from-referrer/)
|
blocked-by-other-PR
t-data
new-contributor
merge-conflict
awaiting-author
|
226/0 |
Mathlib.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/GrayCode.lean,Mathlib/Data/Nat/Size.lean |
5 |
5 |
['Rida-Hamadani', 'alreadydone', 'github-actions', 'grunweg', 'leanprover-community-mathlib4-bot'] |
nobody |
471-81731 1 year ago |
unknown |
unknown |
| 14603 |
awueth author:awueth |
feat: degree is invariant under graph isomorphism |
---
Mathlib has the definition `SimpleGraph.Iso.mapNeighborSet` which is an equivalence between neighbor sets induced by an isomorphism. Would it be beneficial to add the same equivalence for `neighborFinset`?
[](https://gitpod.io/from-referrer/)
|
WIP
t-combinatorics
new-contributor
|
24/0 |
Mathlib/Combinatorics/SimpleGraph/Map/Finite.lean |
1 |
11 |
['awueth', 'github-actions', 'jcommelin', 'kim-em', 'urkud'] |
nobody |
469-71039 1 year ago |
unknown |
unknown |
| 9605 |
davikrehalt author:davikrehalt |
feat(Data/Finset & List): Add Lemmas for Sorting and Filtering |
This PR includes several useful lemmas to the Data/Finset and Data/List modules in Lean's mathlib:
1. `toFinset_filter` (List): Shows that filtering commutes with toFinset.
2. `toFinset_is_singleton_implies_replicate` (List): Shows a list with a singleton toFinset is a List.replicate.
3. `filter_sort_commute` (Finset): Sorting and filtering can be interchanged in Finsets.
4. `Sorted.filter` (List): A sorted list stays sorted after filtering.
5. `Sorted.append_largest` (List): Appending the largest element keeps a list sorted.
6. `sort_monotone_map` (Finset): Relates sorting of a Finset after mapping to sorting of a list.
7. `sort_insert_largest` (Finset): Sorting a Finset with an inserted largest element.
8. `sort_range` (Finset): Sorting a range in a Finset equals the corresponding range list.
9. ~~`filter_eval_true` (List): Filtering a list with a predicate always true keeps the list unchanged.~~
10. ~~`filter_eval_false` (List): Filtering with an always-false predicate gives an empty list.~~
11. ~~`pairwise_concat` (List): Iff condition for Pairwise relation in concatenated lists (similar to pairwise_join).~~
12. `list_map_toFinset` (Finset): toFinset commutes with map under injection
---
- [x] depends on: #15952
This is my first PR to mathlib, so I'm not too familiar with etiquette's and more specifically there are two proofs in the PR which uses aesop, and I am not sure if it's frowned upon. I kept the aesop in there for now as I couldn't construct very short proofs otherwise. The sort_range function proof was suggested in https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Computing.20Finset.20sort.20of.20Finset.20range/near/410346731 by Ruben Van de Velde. Thanks for your time for improving this PR. |
please-adopt
t-data
new-contributor
merge-conflict
awaiting-author
|
71/0 |
Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Sort.lean |
4 |
30 |
['YaelDillies', 'davikrehalt', 'eric-wieser', 'github-actions', 'jcommelin', 'leanprover-community-mathlib4-bot', 'urkud', 'vihdzp'] |
YaelDillies assignee:YaelDillies |
461-53041 1 year ago |
unknown |
unknown |
| 14598 |
Command-Master author:Command-Master |
chore: add typeclasses to unify various `add_top`, `add_eq_top`, etc. |
Add the four typeclasses `IsTopAbsorbing`, `IsBotAbsorbing`, `NoTopSum`, `NoBotSum`, as additive equivalents for `MulZeroClass` and `NoZeroDivisors`. Add instances of these for `ENNReal`, `WithTop α`, `WithBot α`, `PUnit`, `EReal`, `PartENat`, `Measure`, `Interval` and `Filter`.
Also split `Algebra/Order/AddGroupWithTop` to `Algebra/Order/Group/WithTop` and `Algebra/Order/Monoid/WithTop`
---
Previous usages of lemmas with quantified names like `WithTop.add_top` have to be changed to just `add_top`.
`add_lt_top` is `@[simp]`, in accordance with `ENNReal.add_lt_top` being `@[simp]`. This affects `WithTop.add_lt_top` which previously hadn't been `@[simp]`.
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-algebra
t-order
new-contributor
label:t-algebra$ |
264/195 |
Archive/Wiedijk100Theorems/BallotProblem.lean,Mathlib.lean,Mathlib/Algebra/Order/Group/WithTop.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/PUnitInstances/Order.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Analytic/Meromorphic.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/NormedSpace/ENorm.lean,Mathlib/Analysis/SpecialFunctions/JapaneseBracket.lean,Mathlib/Analysis/SpecialFunctions/Log/ENNRealLog.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Nat/WithBot.lean,Mathlib/Data/Real/EReal.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Decomposition/Lebesgue.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSpace.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean,Mathlib/MeasureTheory/Integral/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Martingale/Convergence.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/UniqueFactorizationDomain.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/MetricSpace/Lipschitz.lean |
57 |
30 |
['Command-Master', 'YaelDillies', 'github-actions'] |
nobody |
455-23607 1 year ago |
unknown |
unknown |
| 16885 |
metinersin author:metinersin |
feat(ModelTheory/Complexity): define literals |
Defines `FirstOrder.Language.BoundedFormula.IsLiteral` and `FirstOrder.Language.BoundedFormula.simpleNot` - an auxiliary operation that takes the negation of a formula and does some simplification.
---
- [x] depends on: #16800
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
new-contributor
t-logic
|
148/5 |
Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean |
4 |
20 |
['YaelDillies', 'awainverse', 'github-actions', 'mathlib4-dependent-issues-bot', 'metinersin'] |
nobody |
452-66128 1 year ago |
unknown |
unknown |
| 13248 |
hcWang942 author:hcWang942 |
feat: basic concepts of auction theory |
## Description
Formalise some core concepts and results in auction theory: this includes definitions for first-price and second-price auctions, as well as several fundamental results and helping lemmas.
This is the very first PR of the project formalizing core concepts and results in auction theory.
Our group is working on more contributions on the formalization of game theory prefix.
Co-authored-by: Ma Jiajun
## Reference
Roughgarden, Tim. ***Twenty Lectures on Algorithmic Game Theory***. Cambridge University Press, 2020. [Link](https://www.cambridge.org/core/books/twenty-lectures-on-algorithmic-game-theory/A9D9427C8F43E7DAEF8C702755B6D72B)
---
- [x] Will depend on #14163 once that PR is merged. The Fintype lemmas introduced by this PR have been added in that PR and will be removed from here once that PR gets merged
## Current plan for formalization of Game Theory
The current plan for the formalizing of Game Theory include:
#### 1. Auction Theory. 🎉 _(200+ lines, this PR)_
- Essential definitions of Sealed-bid auction, First-price auction and Second-price auction.
- First-price auction has no dominant strategy.
- Second-price auction has dominant strategy. (Second-price auction is DSIC)
#### 2. Mechanism design & Myerson's Lemma. 🎉 (400+ lines, pending for modification to Mathlib Standard)
- Mechanism design
An allocation rule is implementable if there exists
- Dominant Strategy Incentive Compatible (DSIC) payment rule
- An allocation rule is monotone if for every bidder’s gain is nondecreasing w.r.t. her/his bid
- Myerson's Lemma
Implementable ⇔ Monotone
In the above case, the DSIC payment rule is unique.
#### 3. von Neumann‘s Minimax Theorem. 🎉 (800+ lines, pending for modification to Mathlib Standard)
- Equilibrium in zero sum game
- Formalization strategy: via Loomis’s theorem.
#### 4. Nash Equilibrium. 🎉 (pending for modification to Mathlib Standard)
#### 5. Brouwer fixed-point theorem. (Work in Progress)
#### 6. More Mechanism design. (Planning)
|
merge-conflict
awaiting-author
new-contributor
t-logic
|
204/0 |
Mathlib.lean,Mathlib/GameTheory/Auction/Basic.lean,docs/references.bib |
3 |
148 |
['Shreyas4991', 'YaelDillies', 'eric-wieser', 'faenuccio', 'github-actions', 'grunweg', 'hcWang942', 'tb65536', 'urkud', 'vihdzp'] |
hcWang942 assignee:hcWang942 |
448-18560 1 year ago |
unknown |
unknown |
| 19125 |
yhtq author:yhtq |
feat: add theorems to transfer `IsGalois` between pairs of fraction rings |
feat: add theorems to transfer `IsGalois` between pairs of fraction rings.
- [x] depends on: #18404
- [x] depends on: #19124
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-algebra
new-contributor
label:t-algebra$ |
121/0 |
Mathlib.lean,Mathlib/FieldTheory/Galois/IsFractionRing.lean,Mathlib/RingTheory/Localization/FractionRing.lean |
3 |
3 |
['github-actions', 'mathlib4-dependent-issues-bot', 'tb65536'] |
nobody |
418-40977 1 year ago |
unknown |
unknown |
| 17739 |
Aaron1011 author:Aaron1011 |
feat(Topology/Order/DenselyOrdered): prove Not (IsOpen) for intervals |
Prove that Iic/Ici/Ioc/Ico/Icc intervals are not open in densely ordered topologies with no min/max element
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-topology
new-contributor
|
27/0 |
Mathlib/Topology/Order/DenselyOrdered.lean |
1 |
8 |
['github-actions', 'vihdzp'] |
nobody |
384-62989 1 year ago |
unknown |
unknown |
| 15711 |
znssong author:znssong |
feat(Combinatorics/SimpleGraph): Some lemmas about walk, cycle and Hamiltonian cycle |
---
These lemmas are separated from the `meow-sister/BondyChvatal` branch and will be needed for the proof of the Bondy-Chvátal theorem.
- [x] depends on: #15536
- [x] depends on: #16294 |
merge-conflict
awaiting-author
t-combinatorics
new-contributor
|
407/3 |
Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean |
4 |
22 |
['Rida-Hamadani', 'YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'znssong'] |
nobody |
383-82075 1 year ago |
unknown |
unknown |
| 15720 |
znssong author:znssong |
feat(SimpleGraph): The Bondy-Chvátal theorem |
The proof of the Bondy-Chvátal theorem, with Dirac's theorem and Ore's theorem as its corollary.
- [x] depends on: #15536
- [ ] depends on: #15711
- [ ] depends on: #15578 |
merge-conflict
blocked-by-other-PR
t-combinatorics
new-contributor
|
903/3 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/BondyChvatal.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Increasing.lean |
8 |
3 |
['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot'] |
YaelDillies assignee:YaelDillies |
383-82075 1 year ago |
unknown |
unknown |
| 18629 |
tomaz1502 author:tomaz1502 |
feat(Computability.Timed): Formalization of runtime complexity of List.merge |
This PR adds the formalization of the runtime complexity of the merge function, defined in `Data/List/Sort`.
Requires: https://github.com/leanprover-community/mathlib4/pull/15450
References:
- Previous PR on mathlib3: https://github.com/leanprover-community/mathlib3/pull/14494/
- First discussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/BSc.20Final.20Project/near/220647062
- Second disussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Formalization.20of.20Runtime.20Complexity.20of.20Sorting.20Algorithms/near/284184450
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-computability
awaiting-author
new-contributor
|
186/0 |
Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean |
3 |
2 |
['github-actions', 'trivial1711'] |
nobody |
383-47994 1 year ago |
unknown |
unknown |
| 18461 |
hannahfechtner author:hannahfechtner |
feat: left and right common multiples mixins |
add mixins for left and right common multiples. These carry the data of what factors are used to create the common multiples
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-algebra
new-contributor
label:t-algebra$ |
78/0 |
Mathlib/Algebra/Group/Defs.lean |
1 |
13 |
['github-actions', 'hannahfechtner', 'jcommelin', 'kbuzzard', 'kim-em', 'trivial1711'] |
nobody |
380-9174 1 year ago |
unknown |
unknown |
| 19291 |
PieterCuijpers author:PieterCuijpers |
feat(Algebra/Order/Hom): add quantale homomorphism |
Definition of quantale homomorphisms as functions that are both semigroup homomorphisms and complete lattice homomorphisms.
---
- [x] depends on: #19810
- [x] depends on: #19811
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-algebra
new-contributor
label:t-algebra$ |
209/0 |
Mathlib.lean,Mathlib/Algebra/Order/Hom/Quantale.lean,scripts/noshake.json |
3 |
29 |
['PieterCuijpers', 'YaelDillies', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot'] |
nobody |
378-69653 1 year ago |
unknown |
unknown |
| 20372 |
jvlmdr author:jvlmdr |
feat(MeasureTheory/Function): Add ContinuousLinearMap.bilinearCompLp(L) |
Introduce ContinuousLinearMap.bilinearCompLp and bilinearCompLpL.
Generalize eLpNorm_le_eLpNorm_mul_eLpNorm theorems to include constant C in bound condition.
---
Expect this may be useful for defining tempered distributions from functions in `L^p`.
The definitions more or less follow `ContinuousLinearMap.compLp...`. Names are loosely analogous to `ContinuousLinearMap.bilinearComp` and `SchwartzMap.bilinLeftCLM`.
Note: I preferred the spelling `hpqr : p⁻¹ + q⁻¹ = r⁻¹` with `f` in `L^p` and `g` in `L^q` to `hpqr : 1 / p = 1 / q + 1 / r`. It's easier to obtain from `ENNReal.IsConjExponent` too.
A few questions:
- [ ] I defined `bilinear{Left,Right}LpL` in addition to `bilinearCompLpL` because `LinearMap.mkContinuous₂` is marked as `noncomputable` and `LinearMap.mkContinuous` is not. Is this worth the extra definitions? (Note: This is not visible in the source due to `noncomputable section`.)
- [ ] Should I use `C : ℝ` instead of `C : NNReal` for `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'`?
- [ ] Is it going to be painful to have `[Fact (1 ≤ p)] [Fact (1 ≤ q)] [Fact (1 ≤ r)]`? I don't think there's a way to avoid it though. Maybe providing specialized versions for `p.IsConjExponent q` with `L^1`?
Naming:
- [ ] Is it satisfactory to add a `'` to the `eLpNorm_le_eLpNorm_mul_eLpNorm ` definitions in `CompareExp.lean` where `≤ ‖f x‖ * ‖g x‖` has been replaced with `≤ C * ‖f x‖ * ‖g x‖`? These could replace the existing theorems, although I don't want to break backwards compatibility. There are 5 instances: `eLpNorm_le_eLpNorm_top_mul_eLpNorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm_top'`, `eLpNorm'_le_eLpNorm'_mul_eLpNorm''`, `eLpNorm_le_eLpNorm_mul_eLpNorm_of_nnnorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'` (I'm not sure why the existing theorem `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm` has an internal `'`)
- [ ] Is `bilinearLeftLpL` a suitable name? Other options: `bilinearCompLpLeftL`, `bilinearCompLeftLpL`, `bilinLeftLpL` (analogous to `SchwartzMap.bilinLeftCLM`)
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-measure-probability
new-contributor
|
203/40 |
Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace.lean |
2 |
1 |
['github-actions'] |
nobody |
372-601 1 year ago |
unknown |
unknown |
| 20248 |
peabrainiac author:peabrainiac |
feat(Topology/Compactness): first-countable locally path-connected spaces are delta-generated |
Shows that all first-countable locally path-connected spaces are delta-generated (so in particular all normed spaces and convex subsets thereof are), and that delta-generated spaces are equivalently generated by the unit interval or standard simplices.
---
- [ ] depends on: #21616
In principle, this should be close to all that's required to show that all simplicial complexes and CW-complexes are delta-generated; I just haven't done it yet because I'm not sure which file to best do it in.
[](https://gitpod.io/from-referrer/)
|
blocked-by-other-PR
large-import
new-contributor
merge-conflict
awaiting-author
t-topology
|
1189/813 |
Mathlib.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/Compactness/DeltaGeneratedSpace.lean,Mathlib/Topology/Connected/LocPathConnected.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/Homotopy/HSpaces.lean,Mathlib/Topology/Path.lean |
9 |
22 |
['YaelDillies', 'github-actions', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'peabrainiac'] |
nobody |
359-44311 11 months ago |
unknown |
unknown |
| 19943 |
AlexLoitzl author:AlexLoitzl |
feat(Computability): Add Chomsky Normal Form Grammar and translation |
- Define Chomsky normal form grammars
- Add language-preserving translation between context-free grammars and Chomsky normal form grammars
Co-authored-by: Martin Dvorak martin.dvorak@matfyz.cz
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-computability
awaiting-author
new-contributor
|
3151/0 |
Mathlib.lean,Mathlib/Computability/ChomskyNormalForm/Basic.lean,Mathlib/Computability/ChomskyNormalForm/EmptyElimination.lean,Mathlib/Computability/ChomskyNormalForm/LengthRestriction.lean,Mathlib/Computability/ChomskyNormalForm/TerminalRestriction.lean,Mathlib/Computability/ChomskyNormalForm/Translation.lean,Mathlib/Computability/ChomskyNormalForm/UnitElimination.lean,Mathlib/Computability/ContextFreeGrammar.lean |
8 |
59 |
['AlexLoitzl', 'YaelDillies', 'github-actions', 'kim-em', 'madvorak'] |
nobody |
354-78410 11 months ago |
unknown |
unknown |
| 21501 |
sksgurdldi author:sksgurdldi |
feat(List): add sum_zipWith_eq_finset_sum |
### **Description:**
This PR adds the lemma `List.sum_zipWith_eq_finset_sum` to `Mathlib.Algebra.BigOperators.Group.Finset.Basic`.
#### **Statement:**
The sum of the `zipWith` operation on two lists equals the sum of applying the operation to corresponding elements of the two lists, indexed over the minimum of their lengths.
#### **Formal Statement:**
```lean
lemma sum_zipWith_eq_finset_sum [Inhabited α] [Inhabited β] [AddCommMonoid γ]
{op : α → β → γ}
(l : List α) (m : List β) :
(List.zipWith op l m).sum =
∑ x ∈ (Finset.range (Nat.min l.length m.length)), op (l[x]!) (m[x]!)
```
#### **Remarks:**
- This lemma provides a useful equivalence between `List.zipWith` and summation over a `Finset.range` indexed by `Nat.min l.length m.length`.
- It can be helpful in algebraic manipulations involving list-based summations.
#### **Dependencies:**
No additional dependencies.
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-algebra
new-contributor
label:t-algebra$ |
43/0 |
Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean |
1 |
1 |
['github-actions', 'j-loreaux'] |
nobody |
349-47181 11 months ago |
unknown |
unknown |
| 14313 |
grhkm21 author:grhkm21 |
feat(RepresentationTheory/FdRep): FdRep is a full subcategory of Rep |
```
/-- Equivalence between `FDRep` and the full subcategory of finite dimensional `Rep`. -/
def equivFiniteDimensional :
FDRep k G ≌ FullSubcategory (fun V : Rep k G ↦ FiniteDimensional k V)
``` |
merge-conflict
t-algebra
t-category-theory
new-contributor
label:t-algebra$ |
47/8 |
Mathlib/RepresentationTheory/FDRep.lean |
1 |
19 |
['github-actions', 'grhkm21', 'joelriou', 'kim-em', 'mathlib-bors'] |
nobody |
341-608 11 months ago |
unknown |
unknown |
| 14060 |
YnirPaz author:YnirPaz |
feat(SetTheory/Ordinal/Clubs): define club sets and prove basic properties |
Create a file where club sets are defined and their basic properties are proven.
I also created a new recursion principle for ordinals, bounded recursion.
---
- [ ] depends on: #19189
[](https://gitpod.io/from-referrer/)
|
merge-conflict
blocked-by-other-PR
new-contributor
t-logic
|
315/3 |
Mathlib.lean,Mathlib/Order/SuccPred/Limit.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Club.lean,Mathlib/SetTheory/Ordinal/Topology.lean |
6 |
93 |
['YaelDillies', 'YnirPaz', 'alreadydone', 'dupuisf', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp', 'zeramorphic'] |
nobody |
337-29432 11 months ago |
unknown |
unknown |
| 21959 |
BGuillemet author:BGuillemet |
feat(Topology/ContinuousMap): Stone-Weierstrass theorem for MvPolynomial |
Add the subalgebra of multivariate polynomials and prove it separates points, on the same model as `ContinuousMap/Polynomial.lean`.
Prove the Stone-Weierstrass theorem and some variations for multivariate polynomials.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-topology
new-contributor
|
285/1 |
Mathlib.lean,Mathlib/Topology/ContinuousMap/MvPolynomial.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean |
3 |
1 |
['github-actions'] |
nobody |
335-73022 10 months ago |
unknown |
unknown |
| 15578 |
znssong author:znssong |
feat(Function): Fixed points of function `f` with `f(x) >= x` |
We added some lemmas of fixed points of function `f` with `f(x) >= x`, where `f : α → α` is a function on a finite type `α`. This will be needed in proof of Bondy-Chvátal theorem.
---
See also branch `meow-sister/BondyChvatal`.
[](https://gitpod.io/from-referrer/) |
merge-conflict
awaiting-author
t-analysis
new-contributor
|
82/0 |
Mathlib.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Increasing.lean |
3 |
32 |
['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'urkud', 'vihdzp', 'znssong'] |
nobody |
327-68848 10 months ago |
unknown |
unknown |
| 21018 |
markimunro author:markimunro |
feat(Data/Matrix): add file with key definitions and theorems about elementary row operations |
Prove that each elementary row operation is equivalent to a multiplication by an elementary matrix, has another row operation which inverts it, and that each elementary matrix has a left inverse.
This is a very large PR and I understand it will take time. This is my first one and will likely have issues but I will be ready to answer questions/fix them as soon as possible.
Co-authored-by: Christopher Lynch
---
[](https://gitpod.io/from-referrer/)
|
t-data
enhancement
new-contributor
merge-conflict
awaiting-author
|
1230/0 |
Mathlib.lean,Mathlib/Data/Matrix/ElementaryRowOperations.lean,Mathlib/Data/Matrix/GaussianElimination.lean,Mathlib/Data/Matrix/GaussianEliminationOld,Mathlib/Data/Matrix/oldnames,et --hard 18533caba32,lean-toolchain |
7 |
17 |
['chrisflav', 'eric-wieser', 'github-actions', 'j-loreaux', 'markimunro'] |
nobody |
309-17847 10 months ago |
unknown |
unknown |
| 15212 |
victorliu5296 author:victorliu5296 |
feat: Add fundamental theorem of calculus-2 for Banach spaces |
add the Mean Value Theorem for Banach spaces to the library and include reference for the theorem statement
This theorem states that if `f : X → Y` is differentiable along the line segment from `a` to `b`, then the change in `f` equals the integral of its derivative along this path. This extends the mean value theorem to Banach spaces. This can be used for the eventual proof of the Newton-Kantorovich theorem with 1 constant contained inside the added reference.
Here is the discussion on Zulipchat: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Contributing.20FTC-2.20for.20Banach.20spaces |
t-measure-probability
new-contributor
merge-conflict
awaiting-author
t-analysis
|
60/1 |
Mathlib/MeasureTheory/Integral/FundThmCalculus.lean |
1 |
3 |
['github-actions', 'hrmacbeth', 'victorliu5296'] |
nobody |
304-12836 9 months ago |
unknown |
unknown |
| 22308 |
plp127 author:plp127 |
feat (Analysis/Convex): Generalize `Convex` lemmas to `StarConvex` |
This PR generalizes many lemmas assuming `Convex 𝕜 s` to assume `StarConvex 𝕜 0 s`.
---
- [x] depends on: #22421
[](https://gitpod.io/from-referrer/)
|
merge-conflict
WIP
t-analysis
new-contributor
|
30/18 |
Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/GaugeRescale.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/LocallyConvex/AbsConvexOpen.lean |
4 |
5 |
['Paul-Lez', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] |
nobody |
300-85156 9 months ago |
unknown |
unknown |
| 21488 |
imbrem author:imbrem |
feat(CategoryTheory/Monoidal): premonoidal categories |
Add support for premonoidal categories
---
Still want to add support for:
- Premonoidal braided/symmetric categories
- The monoidal coherence theorem, which I've already ported in my `discretion` library
- The `coherence` tactic, which should work fine for premonoidal categories too
but wanted to get this in front of reviewers ASAP to make sure my general approach was alright
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-category-theory
new-contributor
|
900/361 |
Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/CoherenceLemmas.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,MathlibTest/StringDiagram.lean |
21 |
9 |
['YaelDillies', 'github-actions', 'grunweg', 'imbrem', 'kim-em', 'leanprover-community-bot-assistant'] |
nobody |
300-81424 9 months ago |
unknown |
unknown |
| 20873 |
vbeffara author:vbeffara |
feat(Topology/Covering): path lifting and homotopy lifting |
This proves the existence and uniqueness of path and homotopy lifts through covering maps.
---
I tried to separate as much of the proof as possible into separate PRs (which are already in Mathlib now), but the proof here relies on a monolithic construction of an explicit lift along a well-chosen subdivision, in `partial_lift`, with associated definitions. Only one standalone lean file added.
An older WIP PR #10084 by Junyan Xu @alreadydone proves similar results using a very similar construction for path lifting, with a different argument to obtain continuity for homotopy lifting.
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-topology
new-contributor
|
281/1 |
Mathlib.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Lift.lean |
3 |
9 |
['alreadydone', 'github-actions', 'grunweg', 'vbeffara'] |
nobody |
299-84152 9 months ago |
unknown |
unknown |
| 20313 |
thefundamentaltheor3m author:thefundamentaltheor3m |
feat(Data/Complex/Exponential): prove some useful results about the complex exponential. |
This PR proves two basic results about the complex exponential:
* `abs_exp_mul_I (x : ℂ) : abs (Complex.exp (I * x)) = Real.exp (-x.im)`
* `one_sub_rexp_re_le_abs_one_sub_cexp (x : ℂ) : 1 - Real.exp x.re ≤ Complex.abs (1 - Complex.exp x)`
Both results were proved as part of the sphere packing project. There's a chance they're too specific for mathlib, but I thought they were worth PRing anyway. Would it also be a good idea to tag `abs_exp_mul_I` with `simp`? Feedback/suggestions welcome.
Note: `one_sub_rexp_re_le_abs_one_sub_cexp` was proved by Bhavik Mehta @b-mehta
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-analysis
new-contributor
|
167/141 |
Mathlib.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/ERealExp.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev.lean,Mathlib/Data/Complex/Exponential/Defs.lean,Mathlib/Data/Complex/Exponential/Lemmas.lean,Mathlib/Data/Complex/ExponentialBounds.lean,Mathlib/Tactic/FunProp.lean,MathlibTest/Recall.lean,MathlibTest/positivity.lean |
10 |
12 |
['b-mehta', 'github-actions', 'kim-em', 'thefundamentaltheor3m', 'trivial1711'] |
nobody |
292-55350 9 months ago |
unknown |
unknown |
| 20730 |
kuotsanhsu author:kuotsanhsu |
feat(LinearAlgebra/Matrix/SchurTriangulation): prove Schur decomposition/triangulation |
`Matrix.schur_triangulation` shows that a matrix over an algebraically closed field is unitarily similar to an upper triangular matrix
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-algebra
new-contributor
label:t-algebra$ |
317/2 |
Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/LinearAlgebra/Matrix/SchurTriangulation.lean,Mathlib/Logic/Equiv/Basic.lean |
4 |
14 |
['eric-wieser', 'github-actions', 'kim-em', 'kuotsanhsu'] |
nobody |
292-51482 9 months ago |
unknown |
unknown |
| 23791 |
SEU-Prime author:SEU-Prime |
Create AmiceTrans.lean |
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
WIP
t-number-theory
new-contributor
|
2963/0 |
Mathlib.lean,Mathlib/Analysis/Normed/Ring/Lemmas2.lean,Mathlib/NumberTheory/Padics/AmiceTrans.lean,Mathlib/NumberTheory/Padics/PSAC.lean,Mathlib/NumberTheory/Padics/PSAC2.lean,Mathlib/NumberTheory/Padics/PSAC3.lean,Mathlib/NumberTheory/Padics/PiGammainPS.lean,Mathlib/NumberTheory/Padics/PsiandVar.lean,Mathlib/RingTheory/AdicCompletion/Lemma.lean,Mathlib/RingTheory/PowerSeries/Comp.lean,Mathlib/Topology/ContinuousMap/ZeroAtBot.lean |
11 |
3 |
['SEU-Prime', 'github-actions', 'leanprover-community-bot-assistant'] |
nobody |
280-25094 9 months ago |
unknown |
unknown |
| 22809 |
b-reinke author:b-reinke |
feat: Category algebras and path algebras |
This PR defines the category algebra of a linear category and path algebras of quivers.
---
[](https://gitpod.io/from-referrer/)
|
WIP
t-algebra
t-category-theory
new-contributor
label:t-algebra$ |
218/0 |
Mathlib/Algebra/Ring/Assoc.lean,Mathlib/CategoryTheory/Linear/CategoryAlgebra.lean,Mathlib/Combinatorics/Quiver/PathAlgebra.lean,Mathlib/Data/DFinsupp/BigOperators.lean |
4 |
2 |
['b-reinke', 'github-actions'] |
nobody |
277-15921 9 months ago |
unknown |
unknown |
| 15654 |
TpmKranz author:TpmKranz |
feat(Computability): language-preserving maps between NFA and RE |
Map REs to NFAs via Thompson's construction and NFAs to REs using GNFAs
Last chunk of #12648
---
- [ ] depends on: #15651
- [ ] depends on: #15649
[](https://gitpod.io/from-referrer/)
|
blocked-by-other-PR
new-contributor
t-computability
merge-conflict
awaiting-zulip
|
985/2 |
Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Data/FinEnum/Option.lean,docs/references.bib |
7 |
3 |
['github-actions', 'leanprover-community-mathlib4-bot', 'meithecatte'] |
nobody |
274-48600 8 months ago |
unknown |
unknown |
| 24008 |
meithecatte author:meithecatte |
chore(EpsilonNFA): replace manual lemmas with @[simps] |
---
[](https://gitpod.io/from-referrer/)
|
t-computability
awaiting-author
new-contributor
|
2/24 |
Mathlib/Computability/EpsilonNFA.lean |
1 |
2 |
['YaelDillies', 'github-actions', 'urkud'] |
nobody |
269-7779 8 months ago |
unknown |
unknown |
| 23349 |
BGuillemet author:BGuillemet |
feat: add LocallyLipschitzOn.lipschitzOnWith_of_isCompact and two small lemmas about Lipschitz functions |
Main feat (in Mathlib/Topology/EMetricSpace/Basic.lean): if a function `f` from an extended pseudometric space to a pseudometric space is locally Lipschitz on a compact subset `s`, then `f` is Lipschitz on `s`. The theorem is true only when the codomain of `f` is a pseudometric space, so it needs imports from Mathlib/Topology/MetricSpace.
Other small feat (in Mathlib/Analysis/Calculus/ContDiff/RCLike.lean): a function that is continuously differentiable on an open subset is locally Lipschitz on this subset.
---
- [ ] depends on: #22890
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-topology
large-import
new-contributor
|
59/4 |
Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean |
2 |
4 |
['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] |
PatrickMassot assignee:PatrickMassot |
252-66520 8 months ago |
unknown |
unknown |
| 12799 |
jstoobysmith author:jstoobysmith |
feat(LinearAlgebra/UnitaryGroup): Add properties of Special Unitary Group |
Add properties of the special unitary group, mirroring the properties of found in Algebra/Star/Unitary.lean. In particular, I add an instance of `specialUnitaryGroup` as a `Group`, `Star`, `InvolutiveStar`, and `StarMul`.
---
[](https://gitpod.io/from-referrer/)
|
please-adopt
t-algebra
new-contributor
merge-conflict
awaiting-author
label:t-algebra$ |
78/0 |
Mathlib/LinearAlgebra/UnitaryGroup.lean |
1 |
8 |
['chrisflav', 'jcommelin', 'leanprover-community-bot-assistant'] |
nobody |
242-38473 7 months ago |
unknown |
unknown |
| 23929 |
meithecatte author:meithecatte |
feat(Computability/NFA): improve bound on pumping lemma |
---
- [x] depends on: #25321
[](https://gitpod.io/from-referrer/)
|
t-computability
awaiting-zulip
new-contributor
|
101/10 |
Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean |
2 |
41 |
['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'meithecatte'] |
nobody |
241-58202 7 months ago |
241-58203 241 days ago |
0-37135 10 hours |
| 20334 |
miguelmarco author:miguelmarco |
feat: allow polyrith to use a local Singular/Sage install |
Try to call a local install of Singular (either standalone or inside Sage) to find the witness for polyrith before trying to call the online sage cell server.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
new-contributor
t-meta
|
171/48 |
Mathlib/Tactic/Polyrith.lean,scripts/polyrith_sage.py |
2 |
16 |
['eric-wieser', 'github-actions', 'hanwenzhu', 'kim-em', 'miguelmarco', 'mkoeppe'] |
nobody |
235-31026 7 months ago |
unknown |
unknown |
| 25218 |
kckennylau author:kckennylau |
feat(AlgebraicGeometry): Tate normal form of elliptic curves |
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-algebraic-geometry
awaiting-zulip
new-contributor
|
291/26 |
Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Modular/TateNormalForm.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean |
5 |
31 |
['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'github-actions', 'grunweg', 'kckennylau', 'leanprover-community-bot-assistant'] |
nobody |
214-27787 6 months ago |
unknown |
unknown |
| 10541 |
xgenereux author:xgenereux |
feat(Algebra/SkewMonoidAlgebra/Basic): add SkewMonoidAlgebra |
# Skew Monoid algebras
This file presents a skewed version of `Mathlib.Algebra.MonoidAlgebra.Basic`.
## Definition
We define `SkewMonoidAlgebra k G := G →₀ k` attached with a skewed convolution product.
Here, the product of two elements `f g : SkewMonoidAlgebra k G` is the finitely supported
function whose value at `a` is the sum of `f x * (x • g y)` over all pairs `x, y`
such that `x * y = a`.
This will be used in a later PR to define skew polynomial rings.
Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)>
---
- [x] depends on: #15878
- [x] depends on: #19084
- [x] depends on: #22078
[](https://gitpod.io/from-referrer/)
|
merge-conflict
WIP
t-algebra
new-contributor
label:t-algebra$ |
1624/0 |
Mathlib.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/SkewMonoidAlgebra/Lift.lean |
4 |
105 |
['AntoineChambert-Loir', 'YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions', 'mariainesdff', 'mathlib4-dependent-issues-bot', 'mattrobball', 'xgenereux'] |
AntoineChambert-Loir assignee:AntoineChambert-Loir |
209-83265 6 months ago |
unknown |
unknown |
| 10190 |
jstoobysmith author:jstoobysmith |
feat(AlgebraicTopology): add Augmented Simplex Category |
- Added the definition of the category FinLinOrd of finite linear ordered sets.
- Added the definition of the augmented simplex category `AugmentedSimplexCategory`, and showed it is the Skeleton of FinLinOrd.
- Showed that the category of augmented simplicial objects defined as a comma category is equivalent to the category of functors from `AugmentedSimplexCategory^\op`
---
[](https://gitpod.io/from-referrer/)
|
t-algebraic-topology
WIP
t-category-theory
new-contributor
merge-conflict
|
720/0 |
Mathlib.lean,Mathlib/AlgebraicTopology/AugmentedSimplexCategory.lean,Mathlib/AlgebraicTopology/SimplicialObject.lean,Mathlib/Order/Category/FinLinOrd.lean |
4 |
5 |
['TwoFX', 'YaelDillies', 'joelriou', 'jstoobysmith'] |
nobody |
187-86327 6 months ago |
unknown |
unknown |
| 25486 |
VTrelat author:VTrelat |
feat(SetTheory/ZFC/Integers): define integers in ZFC |
Extend the model of ZFC with integers following the converse direction as for naturals. We first define a type and then build a set. We finally show that both representations have coercions in both direction:
- define a proper type `ZFInt` representing integers based on `ZFNat × ZFNat` and following the usual construction of integers
- add theorems on usual algebraic properties of integers
- define a set `Int` and show that it matches-i.e. that it is isomorphic to-the type `ZFInt`
---
[](https://gitpod.io/from-referrer/)
- [ ] depends on: #25483
- [ ] depends on: #25485 |
merge-conflict
t-set-theory
blocked-by-other-PR
new-contributor
|
2003/0 |
Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Integers.lean |
4 |
3 |
['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] |
nobody |
184-6152 6 months ago |
unknown |
unknown |
| 25485 |
VTrelat author:VTrelat |
feat(SetTheory/ZFC/Naturals): define natural numbers in ZFC |
Extend the model of ZFC with naturals:
- define a set `Nat` of naturals following the usual construction (∅, {∅}, {∅, {∅}}, ...)
- define a proper type `ZFNat` representing naturals
- add theorems on usual algebraic properties of naturals
- provide a recursor and induction schemes to define/prove by induction
---
[](https://gitpod.io/from-referrer/)
- [ ] depend on: #25483
|
merge-conflict
t-set-theory
new-contributor
|
2095/0 |
Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Naturals.lean |
4 |
2 |
['github-actions', 'leanprover-community-bot-assistant'] |
nobody |
184-6148 6 months ago |
unknown |
unknown |
| 25484 |
VTrelat author:VTrelat |
feat(SetTheory/ZFC/Booleans): define Boolean algebra in ZFC |
Extend the model of ZFC with Boolean algebra:
- define a set 𝔹 of booleans
- define a proper type `ZFBool` representing booleans
- add theorems on usual algebraic properties of booleans
- provide usual boolean notations like `⊤`, `⊥`, `∧`, `∨`, etc.
---
[](https://gitpod.io/from-referrer/)
- [ ] depends on: #25483 |
merge-conflict
t-set-theory
blocked-by-other-PR
new-contributor
|
619/0 |
Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean |
3 |
3 |
['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] |
nobody |
184-6143 6 months ago |
unknown |
unknown |
| 25238 |
Hagb author:Hagb |
feat(Tactic/ComputeDegree): add support for scalar multiplication with different types |
It would be able to deal with `a • (X : R[X])` where `a : S` is in a different type `S` with `[SMulZeroClass S R]`.
---
- [x] depends on: #25237
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-meta
new-contributor
|
17/5 |
Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean |
2 |
3 |
['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] |
nobody |
184-6118 6 months ago |
unknown |
unknown |
| 18646 |
jxjwan author:jxjwan |
feat(RingTheory): isotypic components |
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-ring-theory
new-contributor
|
308/0 |
Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/RingTheory/Isotypic.lean,Mathlib/RingTheory/SimpleModule.lean |
3 |
1 |
['github-actions'] |
nobody |
183-8139 5 months ago |
unknown |
unknown |
| 20671 |
thefundamentaltheor3m author:thefundamentaltheor3m |
feat(Analysis/Asymptotics/SpecificAsymptotics): Proving that 𝛔ₖ(n) = O(nᵏ⁺¹) |
This PR proves a result about the $\sigma_k(n)$ arithmetic function, namely, that it is $O\left(n^{k+1}\right)$. Main theorem:
`theorem sigma_asymptotic (k : ℕ) : (fun n ↦ (σ k n : ℝ)) =O[atTop] (fun n ↦ (n ^ (k + 1) : ℝ))`
This result was proved as part of the sphere packing project.
---
[](https://gitpod.io/from-referrer/)
|
t-number-theory
new-contributor
large-import
merge-conflict
awaiting-author
|
29/0 |
Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean |
1 |
3 |
['b-mehta', 'github-actions', 'mathlib4-merge-conflict-bot'] |
b-mehta assignee:b-mehta |
178-11680 5 months ago |
unknown |
unknown |
| 27226 |
xcloudyunx author:xcloudyunx |
feat(Combinatorics/SimpleGraph): Add Subgraph.inclusion_edge_apply_coe and inclusion_edgeSet_apply_coe |
This PR continues the work from #25248.
Original PR: https://github.com/leanprover-community/mathlib4/pull/25248 |
awaiting-author
t-combinatorics
new-contributor
|
14/0 |
Mathlib/Combinatorics/SimpleGraph/Subgraph.lean |
1 |
3 |
['b-mehta', 'github-actions', 'xcloudyunx'] |
b-mehta assignee:b-mehta |
176-27426 5 months ago |
176-41506 176 days ago |
25-82865 25 days |
| 22925 |
ggranberry author:ggranberry |
feat(Mathlib/PlaceHolder/ToeplitzHausdorff): Toeplitz-Hausdorff |
---
[](https://gitpod.io/from-referrer/)
|
WIP
new-contributor
will-close-soon
awaiting-author
help-wanted
t-analysis
|
411/0 |
Mathlib/PlaceHolder/ToeplitzHausdorff.lean,Mathlib/PlaceHolder/ToeplitzHausdorff_v2.lean |
2 |
11 |
['faenuccio', 'ggranberry', 'github-actions'] |
faenuccio assignee:faenuccio |
175-3550 5 months ago |
unknown |
unknown |
| 25483 |
VTrelat author:VTrelat |
chore(Data/Set/Prod, SetTheory/ZFC/Basic): add theorem prod_subset_of_prod and extend ZFC model |
Required by @eric-wieser in #24281
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-data
new-contributor
|
103/0 |
Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean |
2 |
10 |
['Ruben-VandeVelde', 'VTrelat', 'github-actions', 'leanprover-community-bot-assistant'] |
nobody |
174-79870 5 months ago |
unknown |
unknown |
| 8102 |
miguelmarco author:miguelmarco |
feat(Tactic): add `unify_denoms` and `collect_signs` tactics |
This PR adds four new tactics:
- `unify_denoms` tries to put expressions with several divisions in a form with only one division. In the case of fields, it works similarly to `field_simp`, but if the hypothesis about denominators being nonzero are not present, it assumes them, and leaves them as new goals to prove. In that sense, it is an "unsafe" tactic (but can be useful nevertheless, for example when you can't find which exact hypothesis is missing). It also works with expressions of naturals and Euclidean domains, assuming the corresponding hypothesis about the denominators dividing the numerators.
- `unify_denoms!` extends `unify_denoms` to work with (in)equalities, assuming also that the denominators, once in normal form, are positive.
- `collect_signs` works similarly with expressions using sums and substractions: it tries to put them in a form of one sum minus other sum. In the case of working with naturals, it assumes that we never substract a bigger number from a smaller one.
Both are implemented essentially as a macro that combines several rewriting rules. Some new lemmas with the corresponding rules are added.
--- |
please-adopt
new-contributor
merge-conflict
modifies-tactic-syntax
good first issue
t-meta
|
407/0 |
Mathlib.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CollectSigns.lean,Mathlib/Tactic/UnifyDenoms.lean,MathlibTest/unify_denoms.lean,scripts/noshake.json |
7 |
55 |
['Paul-Lez', 'YaelDillies', 'github-actions', 'joneugster', 'kbuzzard', 'mathlib4-merge-conflict-bot', 'miguelmarco'] |
nobody |
173-8938 5 months ago |
unknown |
unknown |
| 20722 |
ctchou author:ctchou |
feat(Counterexamples): the Vitali set is non-measurable |
---
[](https://gitpod.io/from-referrer/)
|
please-adopt
t-measure-probability
new-contributor
merge-conflict
awaiting-author
|
258/3 |
Counterexamples.lean,Counterexamples/VitaliSetNotMeasurable.lean,Mathlib/MeasureTheory/Measure/NullMeasurable.lean,docs/1000.yaml |
4 |
76 |
['ctchou', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'vihdzp'] |
vihdzp assignee:vihdzp |
172-1364 5 months ago |
unknown |
unknown |
| 28502 |
gilesgshaw author:gilesgshaw |
feat(Logic/Basic): avoid unnecessary uses of choice |
Certain proofs are modified to remove a dependence on the axoim of choice
---
- [ ] depends on: #28623
|
blocked-by-other-PR
new-contributor
merge-conflict
awaiting-author
t-logic
|
83/74 |
Mathlib/Logic/Basic.lean |
1 |
7 |
['Ruben-VandeVelde', 'eric-wieser', 'gilesgshaw', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
169-23176 5 months ago |
172-8705 172 days ago |
0-32456 9 hours |
| 19582 |
yu-yama author:yu-yama |
feat(GroupExtension/Abelian): define `OfMulDistribMulAction.equivH2` |
Mainly defines:
- `structure GroupExtension.OfMulDistribMulAction N G [MulDistribMulAction G N]`: group extensions of `G` by `N` where the multiplicative action of `G` on `N` is the conjugation
- `structure GroupExtension.OfMulDistribMulActionWithSection N G [MulDistribMulAction G N]`: group extensions with specific choices of sections
- `def GroupExtension.OfMulDistribMulAction.equivH2`: a bijection between the equivalence classes of group extensions and $H^2 (G, N)$
---
- [x] depends on: #20802 (split PR: contains changes to the `Defs` file)
- [x] depends on: #20998 (split PR: mainly adds the `Basic` file)
- [ ] depends on: #26670 (split PR: adds the first part of the `Abelian` file)
Here is a relevant TODO in Mathlib:
https://github.com/leanprover-community/mathlib4/blob/4e9fa40d7c480937e09cd6e47a591bd6f3b8be42/Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean#L46-L48
I would appreciate your comments.
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-algebra
blocked-by-other-PR
new-contributor
label:t-algebra$ |
750/14 |
Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Abelian.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,docs/references.bib |
4 |
5 |
['YaelDillies', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
166-59684 5 months ago |
unknown |
unknown |
| 28095 |
Equilibris author:Equilibris |
Univ generic corec |
Draft PR: Adding variable universe corecursor for PFunctor
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
new-contributor
|
321/70 |
Mathlib/Data/PFunctor/Multivariate/Basic.lean,Mathlib/Data/PFunctor/Multivariate/M.lean,Mathlib/Data/TypeVec.lean |
3 |
7 |
['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
165-44946 5 months ago |
unknown |
unknown |
| 28150 |
Equilibris author:Equilibris |
chore: clean up proofs typevec proofs |
While adding variable universe corecs I found a lot of theorems in typevec that could do with a bit of a clean-up
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-data
new-contributor
|
24/26 |
Mathlib/Data/TypeVec.lean |
1 |
7 |
['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
165-44945 5 months ago |
165-44946 165 days ago |
13-47613 13 days |
| 25488 |
VTrelat author:VTrelat |
feat(SetTheory/ZFC/Rationals): define rationals in ZFC |
Extend the model of ZFC with rationals: we define a proper type `ZFRat` representing integers based on pairs of `ZFInt` (enforcing the res to be nonzero) and following the usual construction of rationals.
---
[](https://gitpod.io/from-referrer/)
- [ ] depends on: #25483
- [ ] depends on: #25485
- [ ] depends on: #25486 |
merge-conflict
t-set-theory
blocked-by-other-PR
new-contributor
|
2070/0 |
Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Integers.lean,Mathlib/SetTheory/ZFC/Rationals.lean |
5 |
3 |
['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot'] |
nobody |
165-24302 5 months ago |
unknown |
unknown |
| 27403 |
MoritzBeroRoos author:MoritzBeroRoos |
fix: replace probably erroneous usage of ⬝ (with old \cdot) by · (with \centerdot) |
Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot).
Currently the abbreviations \cdot and \centerdot resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for center..).
This pr replaces instances of ⬝ where · was probably meant.
All of the replacement is in comments, except for the file bench_summary.lean which is used for priting the github benchmark results. Since this file is about scientific notation of numbers, sure · was meant to be used, not a rectangle.
[Related](https://github.com/leanprover-community/mathlib4/pull/27399)
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
new-contributor
|
195/195 |
Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/DirectSum/Idempotents.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/Normed/Unbundled/InvariantExtension.lean,Mathlib/Analysis/SpecialFunctions/Complex/CircleAddChar.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/FieldTheory/PurelyInseparable/PerfectClosure.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/NumberTheory/SiegelsLemma.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Instances/Matrix.lean,scripts/bench_summary.lean |
49 |
5 |
['eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant'] |
nobody |
165-24265 5 months ago |
188-187 187 days ago |
7-51497 7 days |
| 27399 |
MoritzBeroRoos author:MoritzBeroRoos |
chore: replace every usage of ⬝ᵥ (with old \cdot) by ·ᵥ (with \centerdot) |
Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot).
Currently the abbreviations `\cdot` and `\centerdot` resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for `center`..):
- `\cdot` gives ⬝ [U+2B1D](https://www.compart.com/en/unicode/U+2B1D) "Black Very Small Square"
- `\centerdot` gives · [U+00B7](https://www.compart.com/en/unicode/U+00B7) "Middle Dot"
Mathlib mostly uses the `\centerdot` variant, except for the dotProduct notation and some probably unsuspecting people wanting \centerdot but getting \cdot in their comments and 6 uses of a notation using the raw `\cdot` without any subscript at `Mathlib\Topology\Homotopy\Product.lean`.
This PR replaces the dot product `⬝ᵥ` with its `\centerdot` counterpart `·ᵥ`. The related PR [here](https://github.com/leanprover/vscode-lean4/pull/639) can then overwrite the `\cdot` abbreviation, to produce the same symbol as the `centerdot` abbreviation does.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
new-contributor
|
133/133 |
Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/Topology/Instances/Matrix.lean |
25 |
6 |
['MoritzBeroRoos', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant'] |
nobody |
164-72497 5 months ago |
188-188 187 days ago |
7-53541 7 days |
| 27479 |
iu-isgood author:iu-isgood |
feat: Abel's Binomial Theorem |
We have formalized Abel's Binomial Theorem as part of an REU project. There are a few remaining sorrys, but we will finish them soon. I will edit this PR message later according to community rules.
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-data
new-contributor
|
326/0 |
Mathlib/Data/Nat/Choose/AbelBinomial.lean |
1 |
28 |
['ElifUskuplu', 'FrankieNC', 'github-actions', 'iu-isgood'] |
nobody |
164-72258 5 months ago |
unknown |
unknown |
| 28279 |
Equilibris author:Equilibris |
feat: univ generic W |
A simple change making `W.ind`'s motive universe generic.
---
A theorem `w_ind_eq` will now be needed, but this will depend on getting `dcongr_heq` merged, and hence I will do this in a separate PR.
[](https://gitpod.io/from-referrer/)
|
t-data
new-contributor
|
16/21 |
Mathlib/Data/PFunctor/Multivariate/W.lean |
1 |
8 |
['Equilibris', 'alexkeizer', 'github-actions'] |
nobody |
156-57467 5 months ago |
unknown |
unknown |
| 26462 |
PSchwahn author:PSchwahn |
feat(LinearAlgebra/Projection): add results about inverse of `Submodule.prodEquivOfIsCompl` |
Add two theorems `Submodule.prodEquivOfIsCompl_symm_apply` and `Submodule.prodEquivOfIsCompl_symm_add`, which are API for `Submodule.prodEquivOfIsCompl`.
We believe these theorems are useful; for example, we have used their statements in a [classification formalization project](https://github.com/LieLean/LowDimSolvClassification).
Co-authored by:
- [Viviana del Barco](https://github.com/vdelbarc)
- [Gustavo Infanti](https://github.com/GuQOliveira)
- [Exequiel Rivas](https://github.com/erivas)
---
I am not sure whether the `prodEquivOfIsCompl_symm_apply` theorem should be tagged with `@[simp]`; this might lead to confluence issues. Opinions are welcome!
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-algebra
new-contributor
label:t-algebra$ |
10/0 |
Mathlib/LinearAlgebra/Projection.lean |
1 |
7 |
['PSchwahn', 'github-actions', 'joelriou', 'kckennylau'] |
joelriou assignee:joelriou |
148-43626 4 months ago |
148-74729 148 days ago |
73-38219 73 days |
| 28623 |
gilesgshaw author:gilesgshaw |
feat(Logic/Basic): minor additions and simplification of proofs |
Add new theorems and simplify proofs.
Specifically, we add the family of related theorems `apply_dite_iff_exists`, `apply_dite_iff_forall`, `apply_ite_iff_and` and `apply_ite_iff_or`.
For each other 'family' of theorems in the file that is analogous to the above, we do the following
- Simplify proofs where possible, e.g. by appealing to the new theorems
- Complete the family, if any of the corresponding four are missing
- Rename to ensure consistency with the above pattern
---
|
merge-conflict
t-logic
new-contributor
|
83/55 |
Archive/Examples/IfNormalization/Result.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Notation/Indicator.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/Logic/Basic.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean,Mathlib/SetTheory/Ordinal/Notation.lean |
9 |
12 |
['eric-wieser', 'gilesgshaw', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127'] |
awainverse assignee:awainverse |
147-78528 4 months ago |
147-78529 147 days ago |
10-53273 10 days |
| 28286 |
bwangpj author:bwangpj |
feat(Geometry/Manifold/ContMDiff): basic lemmas for analytic (`C^ω`) functions |
Add basic lemmas relating `ContMDiff` in the `C^ω` case to being `Analytic` on charts.
This is upstreamed from [https://github.com/girving/ray](https://github.com/girving/ray).
Co-authored-by: Geoffrey Irving
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-differential-geometry
new-contributor
|
36/0 |
Mathlib/Geometry/Manifold/ContMDiff/Defs.lean |
1 |
13 |
['bwangpj', 'girving', 'github-actions', 'grunweg', 'kbuzzard', 'sgouezel'] |
sgouezel assignee:sgouezel |
147-58381 4 months ago |
148-12416 148 days ago |
22-76960 22 days |
| 25778 |
thefundamentaltheor3m author:thefundamentaltheor3m |
feat: Monotonicity of `setIntegral` for nonnegative functions |
This PR makes it easier to prove monotonicity of the Bochner integral on sets for nonnegative functions by removing the stronger assumption required by the general monotonicity lemma that both of the functions being compared must be integrable.
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-measure-probability
new-contributor
|
8/0 |
Mathlib/MeasureTheory/Integral/Bochner/Set.lean |
1 |
6 |
['RemyDegenne', 'github-actions', 'sgouezel', 'thefundamentaltheor3m'] |
nobody |
145-74250 4 months ago |
236-82088 236 days ago |
0-7890 2 hours |
| 29588 |
Periecle author:Periecle |
feat(Analysis/Complex/Residue): Implement residue theory for complex functions at isolated singularities |
# Add basic residue theory for complex functions
This PR introduces the residue theory implementation in mathlib.
## Main additions
- **`HasIsolatedSingularityAt f c`**: Predicate for functions with isolated singularities at point `c`
- **`residue f c hf`**: The residue of `f` at isolated singularity `c`, defined via circle integrals
- **Radius independence**: `residue_eq_two_pi_I_inv_smul_circleIntegral` - residue equals normalized circle integral for any valid radius
- **Holomorphic residues**: `residue_of_holomorphic` - functions holomorphic in a neighborhood have zero residue
- **Simple pole formula**: `residue_simple_pole` - for `f(z) = (z-c)⁻¹ * g(z)`, residue equals `g(c)`
## Implementation notes
- Builds on existing circle integral infrastructure in `CauchyIntegral.lean`
- Uses `Classical.choose` to extract witness radius from isolated singularity condition
- Comprehensive documentation with mathematical context and examples
- Establishes foundation for residue theorem, argument principle, and other applications
## Examples included
- `residue(1/z, 0) = 1` (canonical simple pole)
- Radius independence demonstration
- Zero residues for holomorphic functions
This provides the essential building blocks for complex analysis and first step to formalize residue theory. |
awaiting-author
t-analysis
new-contributor
|
383/0 |
Mathlib/Analysis/Complex/Residue/Basic.lean |
1 |
17 |
['Periecle', 'github-actions', 'hrmacbeth', 'llllvvuu', 'loefflerd'] |
nobody |
132-77728 4 months ago |
unknown |
unknown |
| 29657 |
jcreinhold author:jcreinhold |
feat(CategoryTheory/MarkovCategory): add Markov categories |
This PR adds Markov categories to the category theory library. A Markov category is a symmetric monoidal category where every object has canonical copy and delete morphisms that form commutative comonoids.
## What this gives mathlib
In a Markov category, morphisms model probabilistic processes. The copy morphism `X → X ⊗ X` creates perfect correlation (both outputs always equal). The delete morphism `X → I` marginalizes (sums/integrates out variables).
This structure captures probability theory categorically. The same theorem proves results for:
- Finite probability (stochastic matrices)
- Measure theory (Markov kernels)
- Kleisli categories of probability monads
Fritz (2020) used this to prove categorical versions of Fisher-Neyman, Basu's theorem, and other core statistics results.
## Implementation
- `MarkovCategory`: Extends `SymmetricCategory` with canonical comonoid structure
- `copyMor X : X ⟶ X ⊗ X` and `delMor X : X ⟶ I` for each object
- Coherence axioms: commutativity, counitality, coassociativity
- Compatibility with tensor products
Key design point: The comonoid structure is canonical (fields of the typeclass), not chosen. This matches the probability interpretation where there's exactly one way to copy/marginalize.
## Examples included
1. Cartesian categories: Every cartesian monoidal category forms a Markov category where copy is the diagonal `x ↦ (x,x)` and delete is the terminal morphism. All morphisms are deterministic.
2. FinStoch: Objects are finite types. Morphisms are stochastic matrices (rows sum to 1). This models finite probability spaces with the usual matrix multiplication for composition.
## Scope and review notes
This PR provides the basic structure only. Future PRs would add:
- Conditional independence
- Sufficient statistics
- Connection to measure-theoretic probability
- More examples (Kleisli categories, Gaussian categories)
I'm neither an expert in this material nor in Lean; I've only read a few papers on Markov categories and have gone through tutorial material in Lean. Please review for mathematical correctness and idiomatic Lean. I kept this PR small to check if mathlib wants this addition and to ensure it meets repository standards.
## Why add this now
Markov categories provide a useful abstraction level for probability in type theory. Adding it to mathlib enables future work on categorical probability and statistics. In particular, I'm working on a probabilistic programming library and would like to write some proofs using these constructs.
## References
- Fritz, T. (2020). [A synthetic approach to Markov kernels, conditional independence and theorems on sufficient statistics](https://arxiv.org/abs/1908.07021). *Advances in Mathematics*, 370, 107239.
- Cho, K., & Jacobs, B. (2019). [Disintegration and Bayesian inversion via string diagrams](https://arxiv.org/abs/1709.00322). *Mathematical Structures in Computer Science*, 29(7), 938-971.
---
All definitions include docstrings. The PR has tests for the core functionality.
[](https://gitpod.io/from-referrer/) |
merge-conflict
awaiting-author
t-category-theory
new-contributor
|
2414/7 |
Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Monad/Basic.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Basic.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Deterministic.lean,Mathlib/CategoryTheory/MarkovCategory/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/Cartesian.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Braided.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/CopyDiscard.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Markov.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Bimon_.lean,Mathlib/CategoryTheory/Monoidal/CommComon_.lean,Mathlib/CategoryTheory/Monoidal/Comon_.lean,MathlibTest/CategoryTheory/MarkovCategory.lean,docs/references.bib |
16 |
28 |
['github-actions', 'jcreinhold', 'joelriou', 'mathlib4-merge-conflict-bot'] |
nobody |
131-78559 4 months ago |
136-84683 136 days ago |
0-2547 42 minutes |
| 26178 |
ppls-nd-prs author:ppls-nd-prs |
feat(CategoryTheory/Limits): Fubini for products |
We show that the product of products is a product indexed by the sigma type.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-category-theory
new-contributor
|
17/0 |
Mathlib/CategoryTheory/Limits/Shapes/Products.lean |
1 |
6 |
['chrisflav', 'github-actions', 'leanprover-community-bot-assistant', 'ppls-nd-prs', 'robin-carlier'] |
nobody |
128-6372 4 months ago |
229-15772 229 days ago |
0-45487 12 hours |
| 28630 |
Antidite author:Antidite |
feat(Archive/Imo): right isosceles configuration in the complex plane |
feat(Archive/Imo): right isosceles configuration in the complex plane
This adds `Archive/Imo/Imo1975Q3.lean`, formalizing a triangle configuration
with points A=0, B=1, C=z and auxiliary points R, P, Q built via complex
rotations and sine-based scale factors.
Main results:
* `angle_and_distance`: ∠QRP = π/2 and dist Q R = dist R P.
* Key identity `QRP_rot90`: (Q z).z − R.z = e^{iπ/2} · ((P z).z − R.z).
Design/Style:
* Minimal imports; module docstring; semantic lemma names; all definitions and
theorems live under the namespace `IMO.TriangleConfig`.
Moves:
- (none)
Deletions:
- (none)
---
[](https://gitpod.io/from-referrer/)
|
IMO
awaiting-author
new-contributor
|
196/0 |
Archive.lean,Archive/Imo/Imo1975Q3.lean |
2 |
36 |
['Antidite', 'LLaurance', 'github-actions', 'jsm28'] |
jsm28 assignee:jsm28 |
122-58518 3 months ago |
122-58518 122 days ago |
46-21614 46 days |
| 29926 |
jcreinhold author:jcreinhold |
feat(CategoryTheory/MarkovCategory): add basic finite stochastic matrices definitions to Markov category |
This PR introduces FinStoch, the category of finite stochastic matrices, as a concrete example of a Markov category.
This PR builds on #29925, #29939, and #29919 and was split up from #29657.
## Main additions
### 1. Core definitions (`FinStoch/Basic.lean`)
- `StochasticMatrix m n`: Matrices where rows sum to 1, representing conditional probabilities P(j|i)
- `FinStoch`: The category with finite types as objects and stochastic matrices as morphisms
- `DetMorphism`: Deterministic matrices (exactly one 1 per row) with their underlying functions
- Composition: Matrix multiplication preserves row-stochasticity via the Chapman-Kolmogorov equation
Key design choices:
- Row-stochastic convention: entry (i,j) is P(output=j | input=i)
- Deterministic morphisms tracked separately for structural isomorphisms
### 2. Monoidal structure (`FinStoch/Monoidal.lean`)
Implements tensor products modeling independent parallel processes:
- Tensor on objects: Cartesian product of finite types
- Tensor on morphisms: Kronecker product P((j₁,j₂)|(i₁,i₂)) = P(j₁|i₁) × P(j₂|i₂)
- Structural morphisms: Associator, unitors use deterministic permutations
- Coherence**: Pentagon and triangle identities verified computationally
## Mathematical significance
FinStoch provides the canonical example of a Markov category:
- Morphisms: Stochastic matrices/Markov chains
- Composition: Chapman-Kolmogorov equation for multi-step transitions
- Tensor: Independent parallel processes
This models finite probability spaces categorically, where:
- Objects represent sample spaces
- Morphisms represent probabilistic transitions
- Tensor products model independence
## References
Fritz (2020)
- [ ] depends on: #29925 |
merge-conflict
t-category-theory
new-contributor
|
1437/0 |
Mathlib.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Basic.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Deterministic.lean,Mathlib/CategoryTheory/MarkovCategory/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/Cartesian.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Monoidal.lean,MathlibTest/CategoryTheory/MarkovCategory.lean,docs/references.bib |
9 |
4 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
116-68973 3 months ago |
unknown |
unknown |
| 16773 |
arulandu author:arulandu |
feat(Probability/Distributions): formalize Beta distribution |
Formalize Beta distribution, using Gamma distribution as a reference. Added real-valued beta wrapper, in the manner of gamma. Thanks to @EtienneC30 for help with casting real <-> complex.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
new-contributor
t-measure-probability
|
286/1 |
Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Probability/Distributions/Beta.lean |
3 |
50 |
['EtienneC30', 'arulandu', 'github-actions', 'mathlib4-merge-conflict-bot', 'vihdzp'] |
arulandu assignee:arulandu |
116-67823 3 months ago |
unknown |
unknown |
| 30460 |
janithamalith author:janithamalith |
feat(Nat): add lemma nat_card_orbit_mul_card_stabilizer_eq_card_group |
Added a lemma `nat_card_orbit_mul_card_stabilizer_eq_card_group` which is the Nat.card version of MulAction.card_orbit_mul_card_stabilizer_eq_card_group
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-group-theory
new-contributor
|
6/0 |
Mathlib/GroupTheory/GroupAction/CardCommute.lean |
1 |
17 |
['github-actions', 'kckennylau', 'plp127', 'tb65536'] |
tb65536 assignee:tb65536 |
106-78073 3 months ago |
106-78073 106 days ago |
8-4679 8 days |
| 25225 |
xcloudyunx author:xcloudyunx |
feat(Combinatorics/SimpleGraph): Eulerian walk in connected graph contains all vertices |
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-combinatorics
new-contributor
|
16/0 |
Mathlib/Combinatorics/SimpleGraph/Trails.lean |
1 |
6 |
['IvanRenison', 'github-actions', 'vlad902'] |
kmill assignee:kmill |
105-41605 3 months ago |
unknown |
unknown |
| 30828 |
DeVilhena-Paulo author:DeVilhena-Paulo |
feat: implementation of `Finmap.merge` |
The main contribution of this pull request is the implementation of a `merge` function for finite maps (`Finmap`). The construction relies on the definition of a `merge` function for association lists (`AList`).
There is also a side (unrelated) contribution on `Mathlib/Data/List/Permutation.lean`: the addition of a theorem about the permutation of a list with a head element (that is, a list of the form `a :: l`).
---
[](https://gitpod.io/from-referrer/)
|
t-data
new-contributor
|
449/3 |
Mathlib/Data/Finmap.lean,Mathlib/Data/List/AList.lean,Mathlib/Data/List/Permutation.lean,Mathlib/Data/List/Sigma.lean |
4 |
1 |
['github-actions'] |
nobody |
103-65037 3 months ago |
unknown |
unknown |
| 28676 |
sun123zxy author:sun123zxy |
feat(NumberTheory/ArithmeticFunction): wrap `Nat.totient` as an `ArithmeticFunction` |
This wraps the Euler's totient function `Nat.totient` into a new `ArithmeticFunction` `ϕ`, with some basic identities such as `ϕ * ζ = id` and `μ * id = ϕ.`
---
We use the notation `ϕ` to distinguish from `Nat.totient`'s notation `φ`, however this might be controversial. Suggestions are welcome!
[](https://gitpod.io/from-referrer/)
|
t-number-theory
new-contributor
large-import
merge-conflict
awaiting-author
|
45/5 |
Mathlib/NumberTheory/ArithmeticFunction.lean |
1 |
19 |
['MichaelStollBayreuth', 'SnirBroshi', 'b-mehta', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'riccardobrasca', 'sun123zxy'] |
MichaelStollBayreuth assignee:MichaelStollBayreuth |
99-11076 3 months ago |
114-72152 114 days ago |
47-56312 47 days |
| 30299 |
franv314 author:franv314 |
feat(Topology/Instances): Cantor set |
Prove that the Cantor set has empty interior and the cardinality of the continuum as discussed on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/A.20few.20results.20about.20the.20Cantor.20set/with/543560670)
Moves:
- Mathlib.Topology.Instances.CantorSet -> Mathlib.Topology.Instances.CantorSet.Basic
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
merge-conflict
file-removed
awaiting-author
t-topology
|
355/2 |
Mathlib.lean,Mathlib/Topology/Instances/CantorSet/Basic.lean,Mathlib/Topology/Instances/CantorSet/Cardinality.lean,Mathlib/Topology/Instances/CantorSet/Lemmas.lean |
4 |
5 |
['github-actions', 'grunweg', 'kckennylau', 'mathlib4-merge-conflict-bot'] |
nobody |
99-2806 3 months ago |
119-71835 119 days ago |
0-553 9 minutes |
| 30303 |
franv314 author:franv314 |
chore(Topology/Instances): add deprecated module |
Add deprecated module to moved Cantor set file.
---
- [ ] depends on: #30299
[](https://gitpod.io/from-referrer/)
|
merge-conflict
blocked-by-other-PR
new-contributor
|
486/124 |
Mathlib.lean,Mathlib/Topology/Instances/CantorSet.lean,Mathlib/Topology/Instances/CantorSet/Basic.lean,Mathlib/Topology/Instances/CantorSet/Cardinality.lean,Mathlib/Topology/Instances/CantorSet/Lemmas.lean |
5 |
3 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
99-2804 3 months ago |
119-70036 119 days ago |
0-8 8 seconds |
| 29871 |
zach1502 author:zach1502 |
feat(Matrix/Transvection): Gauss pivot determinant identity and pivot preservation |
This PR adds two lemmas formalizing standard Gaussian pivot identities:
* `Matrix.Transvection.listTransvecCol_mul_mul_listTransvecRow_pivot`:
After applying the canonical left/right transvection products that clear the last column and row,
the pivot (bottom-right) entry of a matrix is unchanged.
Marked `@[simp]`.
* `Matrix.Transvection.det_eq_detTopLeft_mul_pivot`:
If the pivot entry is nonzero, then the determinant of the matrix factors as
the determinant of the top-left block times the pivot entry, after performing
the canonical transvections.
This is the usual Gauss–pivot determinant identity.
* Added simple usage tests in `MathlibTest/matrix.lean` to check that the new lemmas
are usable by `simp`/`simpa`.
---
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-algebra
new-contributor
label:t-algebra$ |
94/0 |
Mathlib/LinearAlgebra/Matrix/Transvection.lean,MathlibTest/matrix.lean |
2 |
3 |
['github-actions', 'riccardobrasca', 'zach1502'] |
nobody |
93-2327 3 months ago |
93-2327 93 days ago |
41-49475 41 days |
| 22361 |
rudynicolop author:rudynicolop |
feat(Computability/NFA): nfa closure properties |
Add the closure properties union, intersection and reversal for NFA.
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-computability
merge-conflict
awaiting-author
awaiting-zulip
|
218/2 |
Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean |
2 |
91 |
['EtienneC30', 'b-mehta', 'ctchou', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop'] |
EtienneC30 assignee:EtienneC30 |
92-30332 3 months ago |
unknown |
unknown |
| 30158 |
nicolaviolette author:nicolaviolette |
feat: combinatorics simplegraph basic |
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-combinatorics
new-contributor
|
9/4 |
Mathlib/Combinatorics/SimpleGraph/Basic.lean |
1 |
3 |
['b-mehta', 'github-actions'] |
b-mehta assignee:b-mehta |
92-21857 3 months ago |
92-21857 92 days ago |
31-68997 31 days |
| 26901 |
5hv5hvnk author:5hv5hvnk |
feat: a simproc version of `compute_degree` |
Wrap `compute_degree` in a simproc for use by simp.
Closes #22219.
--- |
awaiting-CI
new-contributor
merge-conflict
awaiting-author
t-meta
|
198/0 |
Mathlib.lean,Mathlib/Tactic/Simproc/PolynomialDegree.lean,MathlibTest/polynomial_degree_simproc.lean |
3 |
19 |
['5hv5hvnk', 'YaelDillies', 'adomani', 'github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
89-68525 2 months ago |
unknown |
unknown |
| 29458 |
LiamSchilling author:LiamSchilling |
feat(MvPolynomial/WeightedHomogenous): relate `weightedTotalDegree` to `degrees` and `degreeOf` |
`weightedTotalDegree` is the most general notion of multivariate degree in mathlib. These theorems show that it specializes to `degrees` and `degreeOf` with specialized weights.
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-ring-theory
new-contributor
|
17/0 |
Mathlib/RingTheory/MvPolynomial/Homogeneous.lean |
1 |
6 |
['LiamSchilling', 'chrisflav', 'github-actions'] |
chrisflav assignee:chrisflav |
83-35573 2 months ago |
134-6114 134 days ago |
2-17024 2 days |
| 30150 |
imbrem author:imbrem |
feat(CategoryTheory/Monoidal): to_additive for MonoidalCategory |
Add `AddMonoidalCategory`, the additive version of `MonoidalCategory`.
To get this to work, I needed to _remove_ the `to_additive` attributes in `Discrete.lean`, since existing code relies on the `AddMonoid M → MonoidalCategory M` instance. For now, we simply implement the additive variants by hand instead.
---
As discussed in #28718; I added an `AddMonoidalCategory` struct and tagged `MonoidalCategory` with `to_additive`, along with the lemmas in `Category.lean`.
I think this is the right approach, since under this framework the "correct" additive version of `Discrete.lean` would be mapping an `AddMonoid` to an `AddMonoidalCategory`.
Next steps would be to:
- Make `monoidal_coherence` and `coherence` support `AddMonoidalCategory`
- Add `CocartesianMonoidalCategory` extending `AddMonoidalCategory`
[](https://gitpod.io/from-referrer/)
|
t-category-theory
large-import
new-contributor
merge-conflict
awaiting-zulip
t-meta
|
444/125 |
Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/Tactic/ToAdditive/GuessName.lean |
3 |
22 |
['JovanGerb', 'YaelDillies', 'github-actions', 'imbrem', 'mathlib4-merge-conflict-bot'] |
nobody |
83-31516 2 months ago |
123-10182 123 days ago |
0-29227 8 hours |
| 27953 |
CoolRmal author:CoolRmal |
feat(ProbabilityTheory): Conditional Jensen's Inequality |
This PR adds conditional Jensen's inequality.
---
- [ ] depends on: #31180
- [ ] depends on: #31411
- [ ] depends on: #31399
[](https://gitpod.io/from-referrer/)
|
merge-conflict
blocked-by-other-PR
new-contributor
t-measure-probability
|
462/10 |
Mathlib.lean,Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondJensen.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean |
5 |
8 |
['CoolRmal', 'EtienneC30', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
sgouezel assignee:sgouezel |
80-73307 2 months ago |
unknown |
unknown |
| 15651 |
TpmKranz author:TpmKranz |
feat(Computability/NFA): operations for Thompson's construction |
Lays the groundwork for a proof of equivalence of RE and NFA, w.r.t. described language. Actual connection to REs comes later, after the groundwork for the opposite direction has been laid.
Third chunk of #12648
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-computability
merge-conflict
awaiting-author
awaiting-zulip
|
307/5 |
Mathlib/Computability/NFA.lean |
1 |
27 |
['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop'] |
nobody |
78-48648 2 months ago |
unknown |
unknown |
| 15649 |
TpmKranz author:TpmKranz |
feat(Computability): introduce Generalised NFA as bridge to Regular Expression |
Lays the groundwork for a proof of equivalence of NFA and RE, w.r.t. described language. Actual connection to NFA comes later, after the groundwork for the opposite direction has been laid.
Second chunk of #12648
---
- [x] depends on: #15647 [Data.FinEnum.Option unchanged since then]
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-computability
merge-conflict
awaiting-author
awaiting-zulip
|
298/0 |
Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib |
5 |
7 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'meithecatte', 'trivial1711'] |
nobody |
77-64889 2 months ago |
unknown |
unknown |
| 20238 |
maemre author:maemre |
feat(Computability/DFA): Closure of regular languages under some set operations |
This shows that regular languages are closed under complement and intersection by constructing DFAs for them.
---
Closure under all other operations will be proved when someone adds the proof for DFA<->regular expression equivalence, so they are not part of this PR.
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-computability
merge-conflict
awaiting-author
awaiting-zulip
|
159/0 |
Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean |
2 |
60 |
['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'mathlib4-merge-conflict-bot', 'meithecatte', 'urkud'] |
EtienneC30 assignee:EtienneC30 |
77-63979 2 months ago |
unknown |
unknown |
| 5919 |
MithicSpirit author:MithicSpirit |
feat: implement orthogonality for AffineSubspace |
Define `AffineSubspace.orthogonal` and `AffineSubspace.IsOrtho`, as well as develop an API emulating that of `Submodule.orthogonal` and `Submodule.IsOrtho`, respectively. Additionally, provide some relevant lemmas exclusive to affine subspaces, which are mostly to do with the relationship between orthogonality and `AffineSubspace.Parallel`.
Closes #5539
---
Still WIP as I need to add more docstrings as well as notations for the new definitions.
[](https://gitpod.io/from-referrer/)
|
WIP
new-contributor
merge-conflict
help-wanted
t-analysis
|
287/0 |
Mathlib.lean,Mathlib/Analysis/InnerProductSpace/AffineSubspace.lean |
2 |
7 |
['MithicSpirit', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot'] |
MithicSpirit assignee:MithicSpirit |
77-16346 2 months ago |
unknown |
unknown |
| 13442 |
dignissimus author:dignissimus |
feat: mabel tactic for multiplicative abelian groups |
Mabel tactic for multiplicative abelian groups (#10361)
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
merge-conflict
modifies-tactic-syntax
awaiting-author
help-wanted
t-meta
|
439/0 |
Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MAbel.lean,MathlibTest/mabel.lean |
4 |
11 |
['BoltonBailey', 'dignissimus', 'github-actions', 'joneugster', 'kbuzzard', 'mathlib4-merge-conflict-bot'] |
joneugster assignee:joneugster |
77-16082 2 months ago |
unknown |
unknown |
| 14237 |
js2357 author:js2357 |
feat: Define the localization of a fractional ideal at a prime ideal |
Define the localization of a fractional ideal at a prime ideal, and prove some basic properties.
---
This PR is part 3 out of 4 of a proof of `isDedekindDomain_iff_isDedekindDomainDvr`.
Part 4 is available here: #14242
- [x] depends on: #14099 Part 1
- [x] depends on: #14216 Part 2
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-algebra
new-contributor
label:t-algebra$ |
230/0 |
Mathlib.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean |
3 |
22 |
['Vierkantor', 'YaelDillies', 'github-actions', 'js2357', 'kbuzzard', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot'] |
Vierkantor assignee:Vierkantor |
77-16080 2 months ago |
unknown |
unknown |
| 15224 |
AnthonyBordg author:AnthonyBordg |
feat(CategoryTheory/Sites): covering families and their associated Grothendieck topology |
Define covering families on a category and their associated Grothendieck topology by using the API for `Coverage`.
Give an explicit characterization of the covering sieves of the said topology.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-category-theory
new-contributor
|
112/0 |
Mathlib.lean,Mathlib/CategoryTheory/Sites/CoveringFamilies.lean |
2 |
21 |
['AnthonyBordg', 'adamtopaz', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib4-merge-conflict-bot'] |
nobody |
77-15951 2 months ago |
unknown |
unknown |
| 17587 |
kmill author:kmill |
feat: Sym2-as-Finset theory |
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-data
new-contributor
|
105/3 |
Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/RingTheory/Polynomial/Vieta.lean |
4 |
11 |
['FordUniver', 'YaelDillies', 'github-actions', 'kmill', 'mathlib4-merge-conflict-bot'] |
nobody |
77-15797 2 months ago |
unknown |
unknown |
| 18630 |
tomaz1502 author:tomaz1502 |
feat(Computability.Timed): Formalization of runtime complexity of List.mergeSort |
This PR adds the formalization of the runtime complexity of the merge sort algorithm, defined in `Data/List/Sort`.
Requires: https://github.com/leanprover-community/mathlib4/pull/15451
References:
- Previous PR on mathlib3: https://github.com/leanprover-community/mathlib3/pull/14494/
- First discussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/BSc.20Final.20Project/near/220647062
- Second disussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Formalization.20of.20Runtime.20Complexity.20of.20Sorting.20Algorithms/near/284184450
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-computability
new-contributor
|
526/0 |
Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean,Mathlib/Computability/Timed/MergeSort.lean,Mathlib/Computability/Timed/Split.lean |
5 |
9 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
77-15795 2 months ago |
unknown |
unknown |
| 20648 |
anthonyde author:anthonyde |
feat: formalize regular expression -> εNFA |
The file `Computability/RegularExpressionsToEpsilonNFA.lean` contains a formal definition of Thompson's method for constructing an `εNFA` from a `RegularExpression` and a proof of its correctness.
---
- [x] depends on: #20644
- [x] depends on: #20645
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-computability
awaiting-zulip
new-contributor
|
490/0 |
Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib |
3 |
7 |
['anthonyde', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'meithecatte', 'qawbecrdtey'] |
nobody |
77-15657 2 months ago |
unknown |
unknown |
| 21903 |
yhtq author:yhtq |
feat: add from/toList between `FreeSemigroup` and `List` with relative theorems |
Add from/toList between `FreeSemigroup` and `List` with relative theorems, as well as an incidental definition of lexicographic order on `FreeSemigroup`.
---
[](https://gitpod.io/from-referrer/)
|
t-algebra
new-contributor
awaiting-CI
large-import
merge-conflict
label:t-algebra$ |
169/0 |
Mathlib/Algebra/Free.lean |
1 |
12 |
['YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
77-15517 2 months ago |
unknown |
unknown |
| 22159 |
shetzl author:shetzl |
feat: add definition of pushdown automata |
Add the definition of pushdown automata and their two acceptance conditions: acceptance based on empty stack and acceptance based on final state.
Co-authored-by: Tobias Leichtfried
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-computability
awaiting-author
new-contributor
|
70/0 |
Mathlib.lean,Mathlib/Computability/PDA.lean |
2 |
35 |
['YaelDillies', 'github-actions', 'madvorak', 'mathlib4-merge-conflict-bot', 'shetzl'] |
nobody |
77-15511 2 months ago |
unknown |
unknown |
| 22302 |
658060 author:658060 |
feat: add `CategoryTheory.Topos.Power` |
This is a continuation of #21281 with the end goal of defining topoi in Mathlib. It introduces the notion of a power object in a category with a subobject classifier, which is a special case of an internal hom.
The definition `HasPowerObjects C` contained in this PR is all that remains before `IsTopos C` can be defined.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-category-theory
new-contributor
|
312/0 |
Mathlib.lean,Mathlib/CategoryTheory/Topos/Power.lean |
2 |
3 |
['github-actions', 'joelriou', 'mathlib4-merge-conflict-bot'] |
b-mehta assignee:b-mehta |
77-15502 2 months ago |
unknown |
unknown |
| 22314 |
shetzl author:shetzl |
feat: add leftmost derivations for context-free grammars |
Leftmost derivations are often easier to reason about than arbitrary derivations. This PR adds leftmost variants of Rewrites, Produces and Derives to the existing definition of context-free grammars and proves that a string of terminals can be derived iff it can be leftmost derived.
Co-authored-by: Tobias Leichtfried
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-computability
awaiting-author
new-contributor
|
383/0 |
Mathlib.lean,Mathlib/Computability/LeftmostDerivation.lean |
2 |
55 |
['YaelDillies', 'github-actions', 'madvorak', 'mathlib4-merge-conflict-bot', 'shetzl'] |
YaelDillies assignee:YaelDillies |
77-15500 2 months ago |
unknown |
unknown |
| 22790 |
mhk119 author:mhk119 |
feat: Extend `taylor_mean_remainder_lagrange` to `x < x_0` |
The `taylor_mean_remainder_lagrange` theorem has the assumption that $x_0 < x$. In many applications, we need $x < x_0$ and one cannot use the current version to obtain this (see [zulip](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Taylor's.20theorem)). This PR introduces a set of theorems that push negations through Taylor expansions so that one can extend `taylor_mean_remainder_lagrange` to the case when $x < x_0$. These theorems should also be useful elsewhere since they are quite general. |
merge-conflict
awaiting-author
t-analysis
new-contributor
|
111/1 |
Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/Taylor.lean |
3 |
13 |
['Paul-Lez', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'mhk119'] |
nobody |
77-15489 2 months ago |
unknown |
unknown |
| 24333 |
xcloudyunx author:xcloudyunx |
feat(Combinatorics/SimpleGraph): cycle graph implementation for generic vertex types |
The existing `cycleGraph` implementation under Combinatorics/SimpleGraph/Circulant.lean only operates over `Fin n`. This PR implements a cycle graph implementation over any generic vertex type.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-combinatorics
new-contributor
|
187/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Cycle.lean |
2 |
42 |
['IvanRenison', 'github-actions', 'mathlib4-merge-conflict-bot', 'vlad902'] |
kmill assignee:kmill |
77-15336 2 months ago |
unknown |
unknown |
| 25739 |
literandltx author:literandltx |
feat(NumberTheory/LegendreSymbol): Add sqrt‐of‐residue theorems for p=4k+3 and p=8k+5 |
Add a new file `QuadraticResidueRoots.lean` under `Mathlib/NumberTheory/LegendreSymbol/` that proves two explicit “square-root of quadratic residue” theorems for primes of the specific form.
- **`exists_sqrt_of_residue_mod4_eq3`** for primes `p = 4*k + 3`
- **`exists_sqrt_of_residue_mod8_eq5`** for primes `p = 8*k + 5`
It also introduces the helper lemmas `euler_criterion_traditional` and `legendreSym.at_two_mod8_eq_5`. Import lines in `Mathlib.lean` and `Mathlib/NumberTheory/LegendreSymbol/Basic.lean` have been updated accordingly.
|
merge-conflict
awaiting-author
t-number-theory
new-contributor
|
217/0 |
Mathlib.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticReciprocity.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticResidueRoots.lean |
4 |
3 |
['github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot'] |
literandltx assignee:literandltx |
77-15187 2 months ago |
unknown |
unknown |
| 26160 |
oliver-butterley author:oliver-butterley |
feat(MeasureTheory.VectorMeasure): add several lemmas which characterize variation |
Add the following lemmas concerning variation of a VectorMeasure:
* `norm_measure_le_variation`: `‖μ E‖ₑ ≤ variation μ E`.
* `variation_neg`: `(-μ).variation = μ.variation`.
* `variation_zero`: `(0 : VectorMeasure X V).variation = 0`.
* `absolutelyContinuous`
Co-authored-by: @yoh-tanimoto
- [ ] depends on: #26156
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
blocked-by-other-PR
new-contributor
t-measure-probability
|
432/0 |
Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean |
3 |
3 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
77-14999 2 months ago |
214-10005 214 days ago |
15-66611 15 days |
| 26165 |
oliver-butterley author:oliver-butterley |
feat(MeasureTheory.VectorMeasure): add lemma which shows that variation of a `ℝ≥0∞` VectorMeasure is equal to itself |
Add a lemma for the variation of a VectorMeasure which tells that if `μ` is `VectorMeasure X ℝ≥0∞` then `variation μ = μ`.
Co-authored-by: @yoh-tanimoto
- [ ] depends on: #26160
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
blocked-by-other-PR
new-contributor
t-measure-probability
|
467/0 |
Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean |
3 |
3 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
77-14998 2 months ago |
214-9953 214 days ago |
15-65730 15 days |
| 26300 |
igorkhavkine author:igorkhavkine |
feat(Analysis/Calculus/FDeriv): continuous differentiability from continuous partial derivatives on an open domain in a product space |
If a function `f : E × F → G` is continuously differentiable, then its partial derivatives along `E` and `F` are also continuous. The non-trivial converse implication holds when the partial derivatives are continuous on an open domain, and they can be added together to give the total derivative of `f`. See this [#mathlib4 > Partial derivatives @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Partial.20derivatives/near/520995477) and the containing thread for some discussion. The PR creates a new import (`Mathlib.Analysis.Calculus.FDeriv.Partial`), where other results about partial derivatives could go in the future.
---
*this is the migration of #25304 to the PR-from-fork workflow*
- [x] depends on: #25564
- [x] depends on: #26273
[](https://gitpod.io/from-referrer/)
|
WIP
new-contributor
merge-conflict
awaiting-author
t-analysis
|
468/0 |
Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean |
3 |
21 |
['YaelDillies', 'agjftucker', 'github-actions', 'igorkhavkine', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel'] |
sgouezel assignee:sgouezel |
77-14975 2 months ago |
173-63365 173 days ago |
44-74030 44 days |
| 26594 |
metakunt author:metakunt |
feat(Algebra/Polynomial/ZMod): Add Polynomial.equiv_of_nat_of_polynomial_zmod |
This adds an explicit bijection between the naturals and $$\mathbb{Z}/n\mathbb{Z}[X]$$ in a canonical way.
---
I feel that some API is missing to make the theorem shorter, I have no idea what lemmas to extract though.
Also I don't know when to use spaces and when not, so I did it best effort.
|
merge-conflict
awaiting-author
t-algebra
new-contributor
label:t-algebra$ |
465/0 |
Mathlib.lean,Mathlib/Algebra/Polynomial/ZMod.lean |
2 |
3 |
['Ruben-VandeVelde', 'github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
77-14827 2 months ago |
192-58585 192 days ago |
25-4678 25 days |
| 26757 |
fweth author:fweth |
feat(CategoryTheory/Topos): define elementary topos |
This commit begins the formalization of the notion of an *elementary topos*, following the definition in \[Mac Lane & Moerdijk, *Sheaves in Geometry and Logic* (1992), Ch. IV, Section 1]. It introduces the file `Mathlib/CategoryTheory/Topos/Basic.lean`, which currently includes:
* The definition of an elementary topos.
* Proof that the power object map is a functor
* Theorem about pullbacks of characterstic maps
Subobject classifiers, which are used in the definition, have already been defined in `CategoryTheory/Topos/Classifier.lean`
Work in progress: further formalization of the section is planned.
Questions:
* Should the definition of power objects be separated into its own file/module, perhaps under `CategoryTheory/Topos/PowerObject.lean`?
* Is the notation `P` / `P_morph` / `P_functor` for the power object functor on objects / morphisms / total acceptable?
* Should the comments and docstrings rather use the notation from the book, where `g ∘ f` denotes arrow composition from righ to left, or the Lean variant `f ≫ g`?
Klaus Gy klausgy@gmail.com
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-category-theory
new-contributor
|
401/66 |
Mathlib.lean,Mathlib/CategoryTheory/Closed/PowerObjects.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Equalizer.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Topos/Classifier.lean |
9 |
17 |
['fweth', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot'] |
joelriou assignee:joelriou |
77-14822 2 months ago |
106-67841 106 days ago |
61-75483 61 days |
| 27155 |
Pjotr5 author:Pjotr5 |
feat: Shearer's bound on the independence number of triangle free graphs |
I added the file IndependenceNumber.lean to the Mathlib.Combinatorics.SimpleGraph.Triangle folder. It contains a proof of a theorem by Shearer on the independence number of triangle-free graphs . I was told this might be useful to add to Mathlib a Zullip thread linked [here](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Convexity.20of.20a.20specific.20function/with/510469526).
I tried to comply as much as I could with the Mathlib style guide, but I realise that there is probably still a significant amount of editing to be done. For one thing: there are probably some lemmas and theorems in there that might be better suited in other files, but since this is my first PR I though I would all put it in one file before starting to edit a bunch of files.
I was also advised to split up the file into multiple smaller PRs, but since everything is basically serving this one proof I could not really find a natural way to do that.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-combinatorics
new-contributor
|
1266/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/IndependenceNumber.lean |
2 |
10 |
['Pjotr5', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot'] |
nobody |
77-14785 2 months ago |
unknown |
unknown |
| 27753 |
YunkaiZhang233 author:YunkaiZhang233 |
feat(CategoryTheory): implemented proofs for factorisation categories being equivalent to iterated comma categories in two ways |
---
Completed one of the tasks in TODOs, shown and implemented the details for (X/C)/f ≌ Factorisation f ≌ f/(C/Y).
This is migrated from my previous PR #22390
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-category-theory
new-contributor
|
70/1 |
Mathlib/CategoryTheory/Category/Factorisation.lean |
1 |
13 |
['YunkaiZhang233', 'b-mehta', 'github-actions', 'mathlib4-merge-conflict-bot', 'robin-carlier'] |
nobody |
77-14630 2 months ago |
187-72193 187 days ago |
0-2875 47 minutes |
| 27850 |
fyqing author:fyqing |
feat: 0-dimensional manifolds are discrete and countable |
This is the converse direction of the classification of 0-dimensional manifolds. The other direction was shown in #22105.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-differential-geometry
new-contributor
|
80/0 |
Mathlib.lean,Mathlib/Geometry/Manifold/ZeroDim.lean |
2 |
14 |
['fyqing', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'tb65536'] |
grunweg assignee:grunweg |
77-14628 2 months ago |
186-46855 186 days ago |
0-3675 1 hour |
| 28125 |
nonisomorphiclinearmap author:nonisomorphiclinearmap |
feat(Combinatorics): basic definition of simplicial complexes |
This PR introduces the basic definition of a finite (abstract) simplicial complex, located in Mathlib/Combinatorics/SimplicialComplex/Basic.lean.
---
This is our first contribution to mathlib. This work was done as part of the Fields Institute Summer Undergraduate Program on formalization in topological combinatorics. Eventually, we aim to formalize Lovasz's proof of the Kneser Conjecture and this is a small stepping stone in that direction. Some other commits will shortly depend on this one.
We would like to acknowledge the Fields Institute for Research in Mathematical Sciences for their sponsorship. We would also like to thank our supervisors, Professor Chris Kapulkin and Mr. Daniel Carranza, for their guidance and support throughout this project. We would also like to thank our group members Tom Lindquist and Quang Minh Nguyen for our fruitful discussions. |
merge-conflict
t-combinatorics
new-contributor
|
374/0 |
Mathlib.lean,Mathlib/Combinatorics/SimplicialComplex/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Category.lean,Mathlib/Combinatorics/SimplicialComplex/FacePoset.lean,Mathlib/Combinatorics/SimplicialComplex/Hom.lean |
5 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
awainverse assignee:awainverse |
77-14496 2 months ago |
77-14497 77 days ago |
99-48372 99 days |
| 28530 |
nonisomorphiclinearmap author:nonisomorphiclinearmap |
feat(Combinatorics/SimplicialComplex/Topology): add standard simplices and geometric realisation (colimit + functoriality) |
Introduce the standard simplex on a finite vertex set and build the geometric realisation |X| of a simplicial complex. Prove that |X| is the colimit of the face diagram δ_X : X.faces ⥤ TopCat, and define the induced map on realisations |φ| : |X| ⟶ |Y| for a simplicial map φ. Show that the abstract map from colimit functoriality agrees with the concrete push-forward of barycentric coordinates. Package these into a functor SimplicialComplexCat ⥤ TopCat.
---
This is our first contribution to mathlib. This work was done as part of the Fields Institute Summer Undergraduate Program on formalization in topological combinatorics. Eventually, we aim to formalize Lovasz's proof of the Kneser Conjecture and this lays the groundwork to do this.
We would like to acknowledge the Fields Institute for Research in Mathematical Sciences for their sponsorship. We would also like to thank our supervisors, Professor Chris Kapulkin and Mr. Daniel Carranza, for their guidance and support throughout this project. I would also like to thank our group members Sebastian Kumar, Tom Lindquist and Quang Minh Nguyen for our fruitful discussions.
- [ ] depends on: #28125 |
merge-conflict
blocked-by-other-PR
t-combinatorics
new-contributor
|
1826/0 |
Mathlib.lean,Mathlib/Combinatorics/SimplicialComplex/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Category.lean,Mathlib/Combinatorics/SimplicialComplex/FacePoset.lean,Mathlib/Combinatorics/SimplicialComplex/Hom.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Colimit.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Diagram.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Functor.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Map.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/Simplex.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/SimplexMap.lean |
12 |
3 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
77-14482 2 months ago |
unknown |
unknown |
| 28871 |
JaafarTanoukhi author:JaafarTanoukhi |
feat(Combinatorics/Digraph): Tournaments |
Define orientations and tournaments. Related to #26771.
Co-authored-by: Rida Hamadani
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-combinatorics
new-contributor
|
62/0 |
Mathlib.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Digraph/Tournament.lean |
3 |
6 |
['JaafarTanoukhi', 'Rida-Hamadani', 'SnirBroshi', 'github-actions', 'mathlib4-merge-conflict-bot'] |
kmill assignee:kmill |
77-14343 2 months ago |
77-14344 77 days ago |
71-35799 71 days |
| 29947 |
JaafarTanoukhi author:JaafarTanoukhi |
feat(Combinatorics/Digraph): Maps |
Ported `SimpleGraph/Maps.lean` to `Digraph/Maps.lean` for future PRs related to issue #[26771](https://github.com/leanprover-community/mathlib4/issues/26771)
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-combinatorics
new-contributor
|
476/0 |
Mathlib.lean,Mathlib/Combinatorics/Digraph/Maps.lean |
2 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
awainverse assignee:awainverse |
77-13709 2 months ago |
77-13710 77 days ago |
54-81855 54 days |
| 30230 |
CoolRmal author:CoolRmal |
feat(MeasureTheory): Basic properties of the integral against a vector measure with a bilinear form. |
Create a folder named Integral in the folder about vector measures. Define the integral of a function against a vector measure with a bilinear form, and prove that integral is a linear operator on functions, bilinear forms, and vector measures, respectively. Several useful lemmas are added into the file about variations of a vector measure (e.g. triangle inequality).
---
- [ ] depends on: #28499
[](https://gitpod.io/from-referrer/)
|
merge-conflict
blocked-by-other-PR
new-contributor
t-measure-probability
|
1353/0 |
Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Integral/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Integral/L1.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean |
6 |
3 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
77-13540 2 months ago |
unknown |
unknown |
| 14704 |
Command-Master author:Command-Master |
feat(FieldTheory): define typeclass for simple extensions, and prove some properties |
Define `SimpleExtension F K`, which says that `K` is a simple field extension of `F`, and show that together with transcendentality it implies `IsFractionRing F[X] K`.
---
- [x] depends on: #14710
[](https://gitpod.io/from-referrer/)
|
WIP
t-algebra
new-contributor
merge-conflict
awaiting-author
label:t-algebra$ |
120/0 |
Mathlib.lean,Mathlib/FieldTheory/SimpleExtension.lean |
2 |
19 |
['Command-Master', 'acmepjz', 'github-actions', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot', 'tb65536'] |
nobody |
77-10541 2 months ago |
unknown |
unknown |
| 31590 |
SuccessMoses author:SuccessMoses |
chore: tag `commutatorElement_def` with `simp` |
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-algebra
new-contributor
label:t-algebra$ |
1/0 |
Mathlib/Algebra/Group/Commutator.lean |
1 |
2 |
['github-actions', 'grunweg'] |
nobody |
76-74816 2 months ago |
unknown |
unknown |
| 11021 |
jstoobysmith author:jstoobysmith |
feat(AlgebraicTopology): add join of augmented SSets |
This pull-request adds the definition of the join of augmented SSets defined as contravariant functors from `WithInitial SimplexCategory` to `Type u`. In addition it shows that the join of two standard augmented SSets is again an augmented SSets.
From this the definition of the join of simplicial sets should follow easily.
To aid the above theory, an api for `WithInitial SimplexCategory` has been created, with the notion of the `join` and `split` (forming a sort of inverse to join) of objects in this category are defined.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
WIP
t-algebraic-topology
new-contributor
|
2137/1 |
.gitignore,Mathlib.lean,Mathlib/AlgebraicTopology/Join.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SimplexCategoryWithInitial.lean,Mathlib/AlgebraicTopology/SimplicialSet.lean |
6 |
47 |
['github-actions', 'jcommelin'] |
nobody |
76-73957 2 months ago |
unknown |
unknown |
| 18626 |
hannahfechtner author:hannahfechtner |
feat: define Artin braid groups |
Define the Artin braid group on infinitely many strands. Includes a toGroup function which defines a function out of the braid group to any other group (given a function which satisfies the braid relations)
(more to come in this file; next up: Artin braid groups on finitely many strands)
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-algebra
new-contributor
label:t-algebra$ |
91/0 |
Mathlib.lean,Mathlib/GroupTheory/SpecificGroups/BraidGroup/Basic.lean |
2 |
22 |
['github-actions', 'hannahfechtner', 'jcommelin', 'joelriou'] |
nobody |
76-73804 2 months ago |
unknown |
unknown |
| 20029 |
FrederickPu author:FrederickPu |
feat(Tactic/simps): allow for Config attributes to be set directly |
Allow for Config attributes to be set directly when using initialize_simp_projection as per issue #19895
Basically modified initialize_simp_projection so that the user has the option of specifying a tuple of config option values.
Ex:
```
initialize_simp_projection MulEquiv (toFun → apply, invFun → symm_apply) (fullyApplied := false)
```
These config options are then converted into projections.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
WIP
new-contributor
t-meta
|
34/4 |
Mathlib/Tactic/Simps/Basic.lean |
1 |
11 |
['FrederickPu', 'YaelDillies', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant'] |
nobody |
76-73741 2 months ago |
unknown |
unknown |
| 21269 |
658060 author:658060 |
feat(CategoryTheory/Topos): basic definitions and results in topos theory |
This code contains basic definitions and results in topos theory, including the definition of a subobject classifier, power objects, and topoi. It is proved that every topos has exponential objects, i.e. "internal homs". The mathematical content follows chapter IV sections 1-2 of Mac Lane and Moerdijk's text "Sheaves in Geometry and Logic".
---
- [x] depends on: #21281
[](https://gitpod.io/from-referrer/)
|
WIP
t-category-theory
new-contributor
merge-conflict
awaiting-author
|
1269/0 |
Mathlib.lean,Mathlib/CategoryTheory/Topos/Basic.lean,Mathlib/CategoryTheory/Topos/Classifier.lean,Mathlib/CategoryTheory/Topos/Exponentials.lean,Mathlib/CategoryTheory/Topos/Power.lean |
5 |
10 |
['658060', 'gio256', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot'] |
nobody |
76-73714 2 months ago |
unknown |
unknown |
| 23990 |
robertmaxton42 author:robertmaxton42 |
feat(Types.Colimits): Quot is functorial and colimitEquivQuot is natural |
Add `Functor.quotFunctor` to parallel `Functor.sectionsFunctor`, witnessing that `Quot` is functorial; add `colimNatIsoQuotFunctor` to parallel `limNatIsoSectionsFunctor`, witnessing that `colimitEquivQuot` is natural in the diagram $F$.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-category-theory
new-contributor
|
33/0 |
Mathlib/CategoryTheory/Limits/Types/Colimits.lean |
1 |
5 |
['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'robertmaxton42'] |
nobody |
76-73597 2 months ago |
unknown |
unknown |
| 26013 |
tsuki8 author:tsuki8 |
feat(Data/Finset/Card,Data/Set/Finite/Basic): TODO needs a better title |
add `card_bijOn` and `finset_subset_preimage_of_finite_image`
Add `card_bijOn`: proves that for a bijection between finsets, their cardinalities are equal
Add `finset_subset_preimage_of_finite_image`: constructs a finset subset preserving image cardinality
Co-authored-by: Junyu Guo
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-data
new-contributor
|
15/0 |
Mathlib/Data/Finset/Card.lean,Mathlib/Data/Set/Finite/Basic.lean |
2 |
5 |
['Ruben-VandeVelde', 'github-actions'] |
nobody |
76-73508 2 months ago |
218-10331 218 days ago |
13-83428 13 days |
| 26881 |
emo916math author:emo916math |
feat(Analysis/Calculus/Deriv/Star): a formula for `deriv (conj ∘ f ∘ conj)` |
Added a lemma that `deriv (conj ∘ f ∘ conj) = conj ∘ deriv f ∘ conj`, proved by cases on whether the derivative mathematically exists or not. This PR replaces [#26805](https://github.com/leanprover-community/mathlib4/pull/26805); see discussion there.
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-analysis
new-contributor
|
50/2 |
Mathlib/Analysis/Calculus/Deriv/Star.lean |
1 |
15 |
['emo916math', 'github-actions', 'j-loreaux', 'kckennylau'] |
j-loreaux assignee:j-loreaux |
76-73363 2 months ago |
179-73111 179 days ago |
31-69534 31 days |
| 27991 |
sinianluoye author:sinianluoye |
feat(Rat): add Rat.den_eq_of_add_den_eq_one and its dependent lemmas |
```lean4
example {q r : ℚ} (h : (q + r).den = 1) : q.den = r.den := by
```
It is so simple, but I couldn't find it in current mathlib repo.
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-data
new-contributor
|
22/0 |
Mathlib/Data/Rat/Lemmas.lean |
1 |
33 |
['github-actions', 'kim-em', 'mathlib-bors', 'pechersky', 'sinianluoye', 'themathqueen'] |
pechersky assignee:pechersky |
76-73280 2 months ago |
108-10474 108 days ago |
74-50277 74 days |
| 28215 |
5hv5hvnk author:5hv5hvnk |
feat: strong and Weak connectivity for Digraphs |
strong and weak connectivity in Digraphs
---
Should resolve a part of issue #26771
Main additions in the PR:
1. Walks in Digraphs (Walk.lean)
- Basic walk structure with start and end vertices
- Support for walk operations: append, reverse, length
- Support functions: getVert, copy, support
2. Walk Decompositions (WalkDecomp.lean)
- takeUntil and dropUntil functions to split walks
- rotate operation for loop walks
- Theorems relating to walk decomposition properties
3. Subgraphs (subgraph.lean)
- Subgraph structure for digraphs
- Induced and spanning subgraph predicates
- Lattice structure (sup, inf, top, bot)
- Coercion to standalone digraphs
4. Paths (Paths.lean)
- Trail, Path, Circuit, Cycle definitions
- Path structure with no repeating vertices
- Theorems relating different path types
- Basic connectivity definitions (reachable, weakly/strongly connected)
5. Connectivity (Connected.lean)
- Reachability relations and properties
- Strong and weak connectivity definitions
- Connected component types:
- StronglyConnectedComponent
- WeaklyConnectedComponent
- ConnectedComponent
- Component properties and equivalence relations
-->
[](https://gitpod.io/from-referrer/)
|
WIP
new-contributor
merge-conflict
awaiting-author
t-combinatorics
|
1266/0 |
Mathlib.lean,Mathlib/Combinatorics/Digraph/Connected.lean,Mathlib/Combinatorics/Digraph/Paths.lean,Mathlib/Combinatorics/Digraph/Subgraph.lean,Mathlib/Combinatorics/Digraph/Walk.lean,Mathlib/Combinatorics/Digraph/WalkDecomp.lean |
6 |
4 |
['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot'] |
nobody |
76-73259 2 months ago |
unknown |
unknown |
| 29574 |
JarodAlper author:JarodAlper |
feat: regular local rings are domains |
We have added three new files in Mathlib/RingTheory/LocalRing
* EmbeddingDimension.lean
* LocalRingDimension.lean
* RegularLocalRings.lean
We have added two lemmas and an instance in Mathlib/RingTheory/LocalRing/RingHom/Basic.lean
This work was done by Jarod Alper and Brian Nugent.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-ring-theory
new-contributor
|
910/3 |
Mathlib.lean,Mathlib/RingTheory/LocalRing/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRing/LocalRingDimension.lean,Mathlib/RingTheory/LocalRing/RegularLocalRings.lean,Mathlib/RingTheory/LocalRing/RingHom/Basic.lean,lake-manifest.json |
6 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
76-73148 2 months ago |
unknown |
unknown |
| 28718 |
imbrem author:imbrem |
feat: class for chosen finite coproducts |
Added basic `ChosenFiniteCoproducts` class, and started porting some of the lemmas about `ChosenFiniteProducts` suitably translated
---
This, combined with #20182 modified to use chosen finite coproducts and premonoidal categories (#21488), should be enough for me to formalize strong Elgot categories, and hence a lot of categorical iteration theory for my PhD thesis.
Re-done from #21603 to deal with changes in #24399 and #24390
Eventually, if we really want to harmonize approaches, we could introduce an `AddMonoidalCategory` struct and do the analogous to #24399 and #24390 for additive monoidal structure, but that seems like a massive overcomplication for now. It would allow formalizing fun things like rig categories, though.
- [ ] depends on: #30150 |
blocked-by-other-PR
t-category-theory
new-contributor
merge-conflict
awaiting-author
|
290/0 |
Mathlib.lean,Mathlib/CategoryTheory/ChosenFiniteCoproducts.lean |
2 |
9 |
['YaelDillies', 'github-actions', 'imbrem', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier'] |
nobody |
76-73060 2 months ago |
unknown |
unknown |
| 31411 |
CoolRmal author:CoolRmal |
feat: a convex lower-semicontinuous function is the supremum of a sequence of affine functions in a separable space |
This lemma is needed in the proof of conditional Jensen's inequality: #27953
The lemmas in this PR need the RCLike API, so it is not suitable to put them in Mathlib.Topology.Semicontinuous or Mathlib.Analysis.Convex.Function as they does not import RCLike. I tried to put these lemmas in a RCLike related file but I encountered warnings about import (e.g. Modules starting with Mathlib.Topology are not allowed to import modules starting with ...). Therefore, I temporarily put them in [Mathlib/MeasureTheory/Function/ConditionalExpectation/CondJensen.lean](https://github.com/leanprover-community/mathlib4/pull/31411/files#diff-930cc0818908e1ab51f74f3729ae6de8ed43f7914e94ca07c619f48a4c49aa9c).
---
- [ ] depends on: #31180
[](https://gitpod.io/from-referrer/)
|
merge-conflict
blocked-by-other-PR
t-analysis
new-contributor
|
337/10 |
Mathlib.lean,Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondJensen.lean |
4 |
3 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
76-72998 2 months ago |
unknown |
unknown |
| 26765 |
KiringYJ author:KiringYJ |
feat(MeasureTheory/PiSystem): add π-λ theorem and SetLike instance |
Add two small features to `MeasureTheory/PiSystem`:
1. SetLike instance
`instance : SetLike (DynkinSystem α) (Set α)`
This lets us write `s ⊆ d` and `t ∈ d` for a DynkinSystem `d`, matching usual mathlib style.
2. `DynkinSystem.pi_lambda` lemma
Classical π‑λ theorem: if a π‑system `s` is contained in a Dynkin system `d`, every set measurable for `σ(s)` is also in `d`.
Currently, mathlib exposes this result only indirectly (e.g. via `generateFrom_eq`). Although logically equivalent, it is not obvious at first glance that those lemmas are the π‑λ theorem. The new lemma states the result in its familiar textbook form, so users can recognise and cite it immediately.
Both pieces are under 10 lines, term‑mode only, and do not modify existing APIs.
No breaking changes.
No dependencies.
|
awaiting-author
t-measure-probability
new-contributor
|
13/0 |
Mathlib/MeasureTheory/PiSystem.lean |
1 |
14 |
['EtienneC30', 'KiringYJ', 'dagurtomas', 'github-actions', 'ocfnash'] |
RemyDegenne assignee:RemyDegenne |
76-59456 2 months ago |
76-59456 76 days ago |
135-34213 135 days |
| 29434 |
ntapiam author:ntapiam |
feat(NonAssoc/LieAdmissible): prove every ring/algebra is LieAdmissible |
-awaiting-author |
t-algebra
new-contributor
label:t-algebra$ |
27/6 |
Mathlib/Algebra/NonAssoc/LieAdmissible/Defs.lean |
1 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
74-57766 2 months ago |
unknown |
unknown |
| 29777 |
yuanyi-350 author:yuanyi-350 |
feat(Functional Analysis): closed Range Theorem |
- [ ] depends on: #29151 [Corollary of Hahn-Banach theorem]
- [ ] depends on: #29776 [refactor ContinuousLinearMap.isOpenMap by separating it into sublemmas]
---
[](https://gitpod.io/from-referrer/)
|
WIP
blocked-by-other-PR
new-contributor
awaiting-author
t-analysis
|
237/25 |
Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/ClosedRange.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/Topology/Order/OrderClosed.lean |
5 |
4 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
faenuccio assignee:faenuccio |
74-8767 2 months ago |
unknown |
unknown |
| 30637 |
strihanje01 author:strihanje01 |
feat(Combinatorics/SetFamily/Lindstrom): Lindstrom's theorem for subfamilies with equal unions |
add Lindstrom's theorem and its strengthening for equal intersections
---
[](https://gitpod.io/from-referrer/)
|
t-combinatorics
new-contributor
|
209/0 |
Mathlib/Combinatorics/SetFamily/Lindstrom.lean |
1 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
b-mehta assignee:b-mehta |
73-81605 2 months ago |
77-13364 77 days ago |
31-45300 31 days |
| 31796 |
dobronx1325 author:dobronx1325 |
feat(Data/Real/EReal): add mul_lt_mul_of_pos_left theorem |
This PR adds the theorem `EReal.mul_lt_mul_of_pos_left`, which states that for a positive real number `a` and extended reals `b < c`, left multiplication by `a` preserves the strict order: `(a : EReal) * b < (a : EReal) * c`.
The theorem complements existing order-preserving properties for addition in `EReal` and extends the algebraic structure for multiplication. The proof uses basic properties of extended reals and order relations.
---
[](https://gitpod.io/from-referrer/)
|
t-data
new-contributor
|
23/0 |
Mathlib/Data/EReal/Operations.lean |
1 |
4 |
['JovanGerb', 'LLaurance', 'dobronx1325', 'github-actions'] |
nobody |
70-29247 2 months ago |
70-85559 70 days ago |
6-21252 6 days |
| 32169 |
saodimao20 author:saodimao20 |
feat: add convolution_comp_add_right |
This PR adds a lemma `convolution_comp_translation_right` showing that convolution commutes with translation on the right operand. Specifically, it proves that for an additive commutative group $G$, the convolution of a function $f$ with a translated function $x \mapsto g(a + x)$ is equal to the convolution of $f$ and $g$ evaluated at $x + a$.
---
[](https://gitpod.io/from-referrer/)
|
t-analysis
new-contributor
awaiting-author
|
14/0 |
Mathlib/Analysis/Convolution.lean |
1 |
3 |
['github-actions', 'urkud'] |
nobody |
68-15627 2 months ago |
68-15627 68 days ago |
0-81373 22 hours |
| 32126 |
nielsvoss author:nielsvoss |
feat(Analysis/Normed/Operator): definition of singular values for linear maps |
This PR defines a generalization of singular values, the approximation numbers, for continuous linear maps between normed vector spaces. It proves basic lemmas about the approximation numbers and shows that for finite-dimensional vector spaces, the approximation numbers coincide with the standard definition of singular values.
See the discussion on Zulip: https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Singular.20Value.20Decomposition/with/558914024
Co-authored-by: Arnav Mehta
Co-authored-by: Rawad Kansoh
---
[](https://gitpod.io/from-referrer/)
|
WIP
t-analysis
new-contributor
|
331/0 |
Mathlib/Analysis/Normed/Operator/SingularValues.lean |
1 |
2 |
['github-actions', 'nielsvoss'] |
nobody |
67-53168 2 months ago |
unknown |
unknown |
| 31898 |
ntapiam author:ntapiam |
feat(LinearAlgebra/TensorAlgebra): implement HopfAlgebra for TensorAlgebra |
implementation of the natural Hopf algebra structure on the TensorAlgebra |
new-contributor
t-ring-theory
awaiting-author
|
253/0 |
Mathlib.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/LinearAlgebra/TensorAlgebra/Basic.lean,Mathlib/RingTheory/Bialgebra/FreeAlgebra.lean,Mathlib/RingTheory/Bialgebra/TensorAlgebra.lean,Mathlib/RingTheory/HopfAlgebra/TensorAlgebra.lean |
6 |
64 |
['YaelDillies', 'github-actions', 'kckennylau', 'ntapiam'] |
nobody |
60-74004 1 month ago |
73-40817 73 days ago |
0-30128 8 hours |
| 30525 |
515801431 author:515801431 |
feat(Mathlib/Combinatorics/Enumerative/Polya): Add Polya Counting |
This PR introduces basic definitions and results about colorings under permutation group actions.
A coloring is defined as a function X → Y, and the permutation group Equiv.Perm X acts on colorings by precomposition:
(g • c) x = c (g⁻¹ • x)
This formalizes the natural action of relabeling the elements of X.
Main definitions
MulAction (Equiv.Perm X) (X → Y):
The action of the permutation group on colorings via precomposition.
coloringEquiv (c₁ c₂ : X → Y) : Prop:
Two colorings are equivalent if they lie in the same orbit under this action, i.e.
∃ f : Equiv.Perm X, f • c₁ = c₂.
Main results
smul_eq_iff_mem_stabilizer:
Characterizes when two group actions on the same coloring are equal, showing that
g • c = f • c ↔ f⁻¹ * g ∈ stabilizer c.
coloringEquiv_equivalence:
Proves that coloringEquiv defines an equivalence relation on X → Y.
orbit_size_eq_index:
Reformulates the orbit–stabilizer theorem in the context of colorings:
|orbit c| = |Perm X| / |stabilizer c|
Motivation
These results provide foundational infrastructure for studying Burnside’s lemma and Pólya’s enumeration theorem in Mathlib, where the enumeration of distinct colorings up to symmetry plays a central role. |
t-combinatorics
new-contributor
awaiting-author
merge-conflict
|
113/0 |
Mathlib.lean,Mathlib/Combinatorics/Enumerative/Polya.lean |
2 |
8 |
['IvanRenison', 'alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot'] |
awainverse assignee:awainverse |
60-60766 1 month ago |
69-17909 69 days ago |
39-39956 39 days |
| 31113 |
515801431 author:515801431 |
feat(Mathlib/Combinatorics/Enumerative/Polya.lean): Add additional theorem in `Polya.lean` |
---
- [ ] depends on: #30525
---
[](https://gitpod.io/from-referrer/)
|
t-combinatorics
new-contributor
blocked-by-other-PR
merge-conflict
|
302/0 |
Mathlib.lean,Mathlib/Combinatorics/Enumerative/Polya.lean |
2 |
4 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
b-mehta assignee:b-mehta |
60-60642 1 month ago |
69-83068 69 days ago |
16-74719 16 days |
| 24441 |
MrSumato author:MrSumato |
feat(Data/List): add Lyndon-Schutzenberger theorem on list commutativity |
Add Lyndon-Schutzenberger theorem on list commutativity. Included definition for List.repeatSelf that returns list repeated n times.
---
This is my first mathlib PR, so any comments are highly appreciated.
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
t-data
new-contributor
|
129/1 |
Mathlib.lean,Mathlib/Data/List/Commutativity.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/Lemmas.lean |
4 |
38 |
['MrSumato', 'github-actions', 'grunweg', 'madvorak', 'mathlib4-merge-conflict-bot', 'plp127'] |
grunweg assignee:grunweg |
60-56244 1 month ago |
unknown |
unknown |
| 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.
---
[](https://gitpod.io/from-referrer/)
|
t-combinatorics
new-contributor
|
391/0 |
Mathlib.lean,Mathlib/Combinatorics/DiHypergraph/Basic.lean |
2 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
b-mehta assignee:b-mehta |
57-83681 1 month ago |
77-13724 77 days ago |
57-67557 57 days |
| 31147 |
daefigueroa author:daefigueroa |
feat(Dynamics): point transitive monoid actions and transitive points |
We define point transitivity for a monoid action on a topological space and define the set of transitive points. We add some basic lemmas and implications between topological transitivity and point transitivity.
---
- [x] depends on: #28001
[](https://gitpod.io/from-referrer/) |
t-dynamics
new-contributor
awaiting-author
|
114/6 |
Mathlib/Dynamics/Transitive.lean |
1 |
6 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel'] |
sgouezel assignee:sgouezel |
57-81477 1 month ago |
57-81477 57 days ago |
18-34491 18 days |
| 28613 |
espottesmith author:espottesmith |
feat(Combinatorics): define undirected hypergraphs |
This PR defines undirected hypergraphs:
```
@[ext]
structure Hypergraph (α : Type*) where
/-- The vertex set -/
vertexSet : Set α
/-- The hyperedge set -/
hyperedgeSet : Set (Set α)
/-- All hyperedges must be subsets of the vertex set -/
hyperedge_isSubset_vertexSet : ∀ ⦃e⦄, e ∈ hyperedgeSet → e ⊆ vertexSet
```
In addition to the main definition, some additional definitions and related lemmas are provided:
- vertex adjacency
- hyperedge adjacency
- vertex "stars"
- special cases (loops, empty hypergraphs, trivial hypergraphs, complete hypergraphs, simple hypergraphs, k-uniform hypergraphs, and d-regular hypergraphs)
- (some) hypergraph cardinality
- subhypergraphs, induced subhypergraphs, and partial hypergraphs
This implementation is certainly bare-bones. I'm submitting this PR at this point, rather than when my developments are more fleshed out, because there has been some interest in others contributing to hypergraph formalization in mathlib.
In the near future, goals include:
- defining incidence matrices (i.e., conversion from `Hypergraph α` to `Matrix α (Set α) β`
- coersion/generalization of graph as 2-uniform hypergraph
- conversion of a hypergraph into its associated clique graph/two-section graph
- constructing the dual of a hypergraph (note: on first blush, this appears somewhat challenging, given that we define hyperedges as `Set α` rather than some other type `β`)
- rank and co-rank
- walks, paths, cycles, etc. on hypergraphs
---
[](https://gitpod.io/from-referrer/)
|
t-combinatorics
new-contributor
merge-conflict
|
375/0 |
Mathlib.lean,Mathlib/Combinatorics/Hypergraph/Basic.lean |
2 |
54 |
['b-mehta', 'espottesmith', 'github-actions', 'jt496', 'lauramonk', 'mathlib4-merge-conflict-bot'] |
b-mehta assignee:b-mehta |
56-14690 1 month ago |
77-14480 77 days ago |
76-50008 76 days |
| 32869 |
felixpernegger author:felixpernegger |
feat(RingTheory): lemmas around ```Ring.choose``` |
Various small lemmas around Ring.choose.
In particular this should cover all statements from .Data.Nat.Choose.Basic which have a meaningful generalization to arbitrary rings. |
new-contributor
t-ring-theory
|
170/0 |
Mathlib/RingTheory/Binomial.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean |
2 |
1 |
['github-actions'] |
nobody |
52-9942 1 month ago |
unknown |
unknown |
| 31987 |
saodimao20 author:saodimao20 |
feat: add monotonicity and relation lemmas for mgf and cgf |
Add two lemmas about moment-generating and cumulant-generating functions:
- `mgf_mono_in_t_of_nonneg`: For nonnegative random variables, the mgf is monotone in the parameter `t`
- `cgf_zero_of_mgf_one`: The cgf equals zero iff the mgf equals one
These lemmas are useful for studying properties of mgf and cgf in probability theory.
Contributed by sequential-intelligence-lab(SIL), University of Virginia
---
[](https://gitpod.io/from-referrer/)
|
t-measure-probability
new-contributor
awaiting-author
|
21/0 |
Mathlib/Probability/Moments/Basic.lean |
1 |
5 |
['DavidLedvinka', 'github-actions'] |
RemyDegenne assignee:RemyDegenne |
51-73583 1 month ago |
51-73583 51 days ago |
21-30654 21 days |
| 31766 |
SuccessMoses author:SuccessMoses |
feat(Topology/EMetricSpace): continuity of arc length |
fixes half of #31751
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-topology
awaiting-author
|
396/0 |
Mathlib.lean,Mathlib/Topology/EMetricSpace/ArcLength.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean |
3 |
39 |
['SnirBroshi', 'SuccessMoses', 'alreadydone', 'github-actions', 'grunweg', 'j-loreaux'] |
nobody |
51-4170 1 month ago |
56-51420 56 days ago |
2-76065 2 days |
| 32938 |
0xTerencePrime author:0xTerencePrime |
feat(Order/LocallyFinite): prove DenselyOrdered and LocallyFiniteOrder are incompatible |
## Summary
This PR proves that a nontrivial densely ordered linear order cannot be locally finite.
## Main results
* `not_locallyFiniteOrder`: A densely ordered locally finite linear order must be subsingleton.
* `not_locallyFiniteOrder_of_nontrivial`: The main theorem - incompatibility of the two properties.
Note: This implementation imports `Mathlib.Order.Interval.Set.Infinite` to reuse the existing `Set.Icc_infinite` theorem, ensuring standard library consistency.
## Mathematical content
The key insight is that in a densely ordered type, we can always find a new element between any two distinct elements. This means any nontrivial interval contains infinitely many elements. However, `LocallyFiniteOrder` requires intervals to be finite. This contradiction implies that such a type cannot exist (unless it is trivial).
## Motivation
This resolves a TODO mentioned in #7987 (Data/Finset/LocallyFinite entry).
## Verification
- [x] `lake build Mathlib.Order.LocallyFinite.Basic` passes
- [x] `lake exe runLinter Mathlib.Order.LocallyFinite.Basic` passes
|
t-order
new-contributor
awaiting-author
|
28/0 |
Mathlib/Order/Interval/Finset/Basic.lean |
1 |
10 |
['0xTerencePrime', 'CoolRmal', 'github-actions', 'jcommelin', 'plp127'] |
nobody |
47-10585 1 month ago |
47-10625 47 days ago |
2-83075 2 days |
| 32698 |
farruhx author:farruhx |
feat(List): add aesop / simp annotations to selected lemmas for improved automation |
This PR adds `@[aesop safe]` and `@[simp]` annotations to a set
of List lemmas whose proofs are routine and benefit from standardized
automation. No statements or definitions are changed; only proof annotations
are added.
The lemmas updated in this PR are:
* `or_exists_of_exists_mem_cons`
* `append_subset_of_subset_of_subset`
* `map_subset_iff`
* `append_eq_has_append`
* `append_right_injective`
* `append_left_injective`
* `reverse_surjective`
* `reverse_bijective`
* `mem_getLast?_append_of_mem_getLast?`
* `mem_dropLast_of_mem_of_ne_getLast`
* `idxOf_eq_length_iff`
* `idxOf_append_of_mem`
* `length_eraseP_add_one`
The goal is to make these commonly used lemmas easier for `aesop`-based
automation to resolve, while avoiding any interference with simp-normal-form
lemmas or canonical rewrite rules.
There are no API changes and no new theorems—only improved automation behavior. |
t-data
new-contributor
awaiting-author
|
18/1 |
Mathlib/Data/List/Basic.lean |
1 |
8 |
['artie2000', 'euprunin', 'farruhx', 'github-actions'] |
pechersky assignee:pechersky |
46-45354 1 month ago |
46-45354 46 days ago |
7-30937 7 days |
| 27817 |
zhuyizheng author:zhuyizheng |
feat: add IMO2025P1 |
Add a solution to IMO2025P1, the original problem statement from https://github.com/jsm28/IMOLean
---
[](https://gitpod.io/from-referrer/)
|
IMO
awaiting-author
new-contributor
merge-conflict
|
1310/0 |
Archive.lean,Archive/Imo/Imo2025Q1.lean |
2 |
9 |
['github-actions', 'kim-em', 'mathlib4-merge-conflict-bot', 'zhuyizheng'] |
dwrensha assignee:dwrensha |
45-77551 1 month ago |
105-42119 105 days ago |
54-69322 54 days |
| 26923 |
oliver-butterley author:oliver-butterley |
feat(Dynamics/BirkhoffSum): add the pointwise ergodic theorem (Birkhoff's) |
The Pointwise Ergodic Theorem, also known as Birkhoff's Ergodic Theorem.
Co-authored-by: Lua Viana Reis
- [x] depends on: #26074
- [x] depends on: #26807
- [x] depends on: #26810
- [x] depends on: #26840
- [x] depends on: #26842
- [x] depends on: #26848
- [x] depends on: #26851
- [x] depends on: #26852
- [x] depends on: #26853
- [x] depends on: #27008
- [x] depends on: #28901
Zulip: [PR thread](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2326923.20The.20pointwise.20ergodic.20theorem.20.28Birkhoff's.29/with/527835158)
---
[](https://gitpod.io/from-referrer/)
|
t-dynamics
new-contributor
awaiting-author
|
398/0 |
Mathlib.lean,Mathlib/Dynamics/BirkhoffSum/Pointwise.lean |
2 |
31 |
['D-Thomine', 'github-actions', 'leanprover-community-bot-assistant', 'lua-vr', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel', 'urkud'] |
sgouezel assignee:sgouezel |
44-13574 1 month ago |
49-57892 49 days ago |
98-44290 98 days |
| 33218 |
Blackfeather007 author:Blackfeather007 |
feat(Algebra): Define the associated graded ring to filtered ring |
Define the associated graded ring to a filtered ring.
---
- [ ] depends on: #33217
migrated from https://github.com/leanprover-community/mathlib4/pull/26858 |
t-ring-theory
new-contributor
blocked-by-other-PR
|
450/0 |
Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean |
2 |
2 |
['github-actions', 'mathlib4-dependent-issues-bot'] |
nobody |
43-23816 1 month ago |
unknown |
unknown |
| 33219 |
Blackfeather007 author:Blackfeather007 |
feat(Algebra): Define associated graded algebra |
Define the associated graded algebra of a filtered algebra, constructed from a special case of associated graded ring.
---
- [ ] depends on: #33218
migrated from #26859
|
t-ring-theory
new-contributor
blocked-by-other-PR
|
563/0 |
Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean |
2 |
2 |
['github-actions', 'mathlib4-dependent-issues-bot'] |
nobody |
43-23708 1 month ago |
unknown |
unknown |
| 33220 |
Blackfeather007 author:Blackfeather007 |
feat(Algebra): Define associated graded module |
Define the associated graded module to a filtered module.
---
- [ ] depends on: #33218
migrated from #26860
|
t-ring-theory
new-contributor
blocked-by-other-PR
|
669/0 |
Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean |
2 |
2 |
['github-actions', 'mathlib4-dependent-issues-bot'] |
nobody |
43-23624 1 month ago |
unknown |
unknown |
| 33227 |
Blackfeather007 author:Blackfeather007 |
feat(Algebra): exact of associated graded exact |
We proved that a chain complex is exact if its associated graded complex is exact.
Co-authored-by: Huanyu Zheng @Yu-Misaka [suzuka@misaka-yu.com](mailto:suzuka@misaka-yu.com)
Co-authored-by: Yi Yuan @yuanyi-350 [kysyy1@126.com](mailto:kysyy1@126.com)
Co-authored-by: Weichen Jiao @AlbertJ-314 [albertjiao314@gmail.com](mailto:albertjiao314@gmail.com)
---
- [ ] depends on: #33226
migrated from #26869 |
t-ring-theory
new-contributor
blocked-by-other-PR
|
728/0 |
Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean |
4 |
2 |
['github-actions', 'mathlib4-dependent-issues-bot'] |
nobody |
43-21296 1 month ago |
43-21297 43 days ago |
0-206 3 minutes |
| 33226 |
Blackfeather007 author:Blackfeather007 |
feat(Algebra): associated graded exact of exact and strict |
In this file, we define the concept of exhaustive filtrations.
We also prove a AssociatedGradedRingHom sequence is exact iff each GradedPieceHom is exact.
And when a sequence is strict exact, the corresponding AssociatedGradedRingHom sequence is also exact.
Co-authored-by: Huanyu Zheng @Yu-Misaka [suzuka@misaka-yu.com](mailto:suzuka@misaka-yu.com)
Co-authored-by: Yi Yuan @yuanyi-350 [kysyy1@126.com](mailto:kysyy1@126.com)
Co-authored-by: Weichen Jiao @AlbertJ-314 [albertjiao314@gmail.com](mailto:albertjiao314@gmail.com)
---
- [ ] depends on: #33222
migrated from #26868 |
t-ring-theory
new-contributor
blocked-by-other-PR
|
529/0 |
Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean |
4 |
2 |
['github-actions', 'mathlib4-dependent-issues-bot'] |
nobody |
43-21294 1 month ago |
43-21295 43 days ago |
0-415 6 minutes |
| 33225 |
Blackfeather007 author:Blackfeather007 |
feat(Algebra): filtered module hom |
In this PR we defined the filtered semi-linear map for filtered module and the associated graded module hom.
---
- [ ] depends on: #33220
- [ ] depends on: #33223
migrated from #26867 |
t-ring-theory
new-contributor
blocked-by-other-PR
|
1205/0 |
Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean |
3 |
2 |
['github-actions', 'mathlib4-dependent-issues-bot'] |
nobody |
43-21293 1 month ago |
unknown |
unknown |
| 33224 |
Blackfeather007 author:Blackfeather007 |
feat(Algebra): define filtered alghom |
In this PR, we define the filtered algebra homomorphisms on algebras and prove some basic properties of
them.
---
- [ ] depends on: #33219
- [ ] depends on: #33223
migrated from #26863 |
t-ring-theory
new-contributor
blocked-by-other-PR
|
1055/0 |
Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean |
3 |
2 |
['github-actions', 'mathlib4-dependent-issues-bot'] |
nobody |
43-21291 1 month ago |
43-21292 43 days ago |
0-978 16 minutes |
| 33223 |
Blackfeather007 author:Blackfeather007 |
feat(Algebra): define filtered ring homomorphism |
In this PR, we define the filtered ring morphisms on rings and prove some basic properties of
them.
Co-authored-by: Huanyu Zheng @Yu-Misaka [suzuka@misaka-yu.com](mailto:suzuka@misaka-yu.com)
Co-authored-by: Yi Yuan @yuanyi-350 [kysyy1@126.com](mailto:kysyy1@126.com)
Co-authored-by: Weichen Jiao @AlbertJ-314 [albertjiao314@gmail.com](mailto:albertjiao314@gmail.com)
---
- [ ] depends on: #33218
- [ ] depends on: #33222
migrated from #26862 |
t-ring-theory
new-contributor
blocked-by-other-PR
|
824/0 |
Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean |
3 |
2 |
['github-actions', 'mathlib4-dependent-issues-bot'] |
nobody |
43-21288 1 month ago |
43-21291 43 days ago |
0-1162 19 minutes |
| 33222 |
Blackfeather007 author:Blackfeather007 |
feat(Algebra): define filtered add group hom |
In this file we define filtered hom and the corresponding associated graded hom for abelian groups.
Co-authored-by: Huanyu Zheng @Yu-Misaka [suzuka@misaka-yu.com](mailto:suzuka@misaka-yu.com)
Co-authored-by: Yi Yuan @yuanyi-350 [kysyy1@126.com](mailto:kysyy1@126.com)
Co-authored-by: Weichen Jiao @AlbertJ-314 [albertjiao314@gmail.com](mailto:albertjiao314@gmail.com)
---
- [ ] depends on: #33217
migrated from #26861
|
new-contributor
t-ring-theory
blocked-by-other-PR
|
368/0 |
Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean |
3 |
2 |
['github-actions', 'mathlib4-dependent-issues-bot'] |
nobody |
43-21287 1 month ago |
43-21288 43 days ago |
0-1375 22 minutes |
| 33178 |
gw90 author:gw90 |
feat(Analysis/CStarAlgebra/Spectrum): Adding lemmas that the CStarAlgebra norm equals the square root of the spectral radius of star a * a |
Adds lemmas that the ||a||^2_A=sqrt(spectralRadius C (star a * a)). I think it would be helpful to have these lemmas available in Mathlib. It'll help with some of the other things I'm working on. Feel free to move them to a different file or rename them as you see fit. |
new-contributor
t-analysis
awaiting-author
|
24/0 |
Mathlib/Analysis/CStarAlgebra/Spectrum.lean |
1 |
15 |
['github-actions', 'gw90', 'themathqueen', 'vihdzp'] |
nobody |
42-59555 1 month ago |
44-35174 44 days ago |
0-14281 3 hours |
| 32264 |
jjtowery author:jjtowery |
feat(Bicategory): add lax slice bicategory |
---
In this PR, I define the lax slice bicategory for a lax functor over an object. I also give the change of slice strict pseudofunctor. These are from Section 7.1 of Johnson & Yau and are essential for their Whitehead theorem for bicategories (lax functor biequivalence iff essentially surjective, essentially full, and fully faithful), which I'd like to prove at some point.
[](https://gitpod.io/from-referrer/)
|
t-category-theory
new-contributor
awaiting-author
|
527/0 |
Mathlib.lean,Mathlib/CategoryTheory/Bicategory/LaxSlice.lean |
2 |
12 |
['dagurtomas', 'github-actions', 'jjtowery', 'robin-carlier'] |
dagurtomas assignee:dagurtomas |
39-49773 1 month ago |
62-53230 62 days ago |
3-46291 3 days |
| 32960 |
dleijnse author:dleijnse |
feat(FieldTheory): adjoin pth roots |
For a field `k` of exponential characteristic `p` and a subset `S` of `k`, we define the extension of `k` obtained by adjoining all `p`-th roots of elements of `S`. We prove that this is a purely inseparable extension, and provide some basic API.
---
[](https://gitpod.io/from-referrer/)
|
t-algebra
new-contributor
awaiting-author
label:t-algebra$ |
131/0 |
Mathlib.lean,Mathlib/FieldTheory/PurelyInseparable/AdjoinPthRoots.lean |
2 |
13 |
['artie2000', 'chrisflav', 'dleijnse', 'erdOne', 'github-actions', 'leanprover-radar'] |
erdOne assignee:erdOne |
38-66425 1 month ago |
38-66425 38 days ago |
10-11880 10 days |
| 33163 |
Aaron1011 author:Aaron1011 |
feat: prove subgroup of (M -> Z) is finitely generated |
---
[](https://gitpod.io/from-referrer/)
|
t-ring-theory
new-contributor
awaiting-author
|
5/0 |
Mathlib/RingTheory/DedekindDomain/Dvr.lean |
1 |
2 |
['erdOne', 'github-actions'] |
alreadydone assignee:alreadydone |
38-59375 1 month ago |
38-59375 38 days ago |
5-78603 5 days |
| 33217 |
Blackfeather007 author:Blackfeather007 |
feat(Algebra): define associated graded structure for abelian group |
In this PR we define the associated graded structure for abelian group when given a filtration and only give some basic lemmas about it.
---
migrated from https://github.com/leanprover-community/mathlib4/pull/26857
|
new-contributor
t-ring-theory
awaiting-author
|
144/0 |
Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean |
2 |
4 |
['erdOne', 'github-actions'] |
erdOne assignee:erdOne |
38-53716 1 month ago |
38-53716 38 days ago |
4-55780 4 days |
| 33133 |
0xTerencePrime author:0xTerencePrime |
feat(Algebra/Group/Center): add Decidable (IsMulCentral a) instance |
This PR adds a `Decidable` instance for `IsMulCentral a`.
### Summary
The structure `IsMulCentral` was missing a `Decidable` instance. This PR provides the instance by leveraging `isMulCentral_iff`, enabling decidability for both multiplicative and additive (via `to_additive`) structures.
### Verification
- `lake build Mathlib.Algebra.Group.Center` passed.
- `lake exe runLinter Mathlib.Algebra.Group.Center` passed. |
t-algebra
new-contributor
awaiting-author
label:t-algebra$ |
7/0 |
Mathlib/Algebra/Group/Center.lean |
1 |
3 |
['github-actions', 'robin-carlier'] |
ocfnash assignee:ocfnash |
33-1166 1 month ago |
33-1166 33 days ago |
12-58151 12 days |
| 33502 |
MrQubo author:MrQubo |
fix(Tactic/ProxyType): Pass params explicitly in proxy_equiv% implementation |
Fix [#mathlib4 > `deriving Fintype` with Prop](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60deriving.20Fintype.60.20with.20Prop/with/566118621)
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-meta
WIP
|
12/2 |
Mathlib/Tactic/ProxyType.lean,MathlibTest/DeriveFintype.lean |
2 |
7 |
['MrQubo', 'github-actions', 'kmill'] |
kmill assignee:kmill |
31-54490 1 month ago |
31-54491 31 days ago |
0-57325 15 hours |
| 22657 |
Xmask19 author:Xmask19 |
feat: a graph is maximally acyclic iff it is a tree |
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
t-combinatorics
new-contributor
|
86/0 |
Mathlib/Combinatorics/SimpleGraph/Acyclic.lean |
1 |
8 |
['Rida-Hamadani', 'SnirBroshi', 'b-mehta', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot'] |
b-mehta assignee:b-mehta |
31-47583 1 month ago |
unknown |
unknown |
| 17176 |
arulandu author:arulandu |
feat: integrals and integrability with .re |
Lemmas for swapping order of .re and integration/integrability.
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
awaiting-author
new-contributor
t-measure-probability
please-adopt
|
49/0 |
Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean |
4 |
32 |
['EtienneC30', 'arulandu', 'github-actions', 'loefflerd'] |
nobody |
29-57488 29 days ago |
unknown |
unknown |
| 32918 |
michelsol author:michelsol |
feat: define `supEdist` and `supDist` |
Create a new file Topology.MetricSpace.SupDistance and define the supremal distance in (extended) metric spaces. The defined `supEdist` and `supDist` will have similar theory to the already existing `infEdist` and `infDist`. The motivation is to be able to define the radius of a minimal bounding sphere as the infimum of the supDist later.
[zulip discussion here](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Formalizing.20Jung's.20theorem.20and.20minimal.20bounding.20spheres) |
t-topology
new-contributor
merge-conflict
|
75/0 |
Mathlib.lean,Mathlib/Topology/MetricSpace/SupDistance.lean |
2 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
RemyDegenne assignee:RemyDegenne |
29-56889 29 days ago |
29-56891 29 days ago |
21-957 21 days |
| 33330 |
michael-novak-math author:michael-novak-math |
feat: add arc-length reparametrization of parametrized curves |
add new definitions of arc-length reparametrization and its corresponding parameter transformation and a theorem establishing the desired properties. |
t-analysis
new-contributor
merge-conflict
|
311/0 |
Mathlib.lean,Mathlib/Analysis/Calculus/ArcLengthReparametrization.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,docs/references.bib,lake-manifest.json |
5 |
53 |
['SnirBroshi', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'michael-novak-math'] |
j-loreaux assignee:j-loreaux |
27-38443 27 days ago |
27-38444 27 days ago |
6-57754 6 days |
| 33756 |
dleijnse author:dleijnse |
feat(FieldTheory): root of polynomial with p power coefficients |
This PR proves the results in https://stacks.math.columbia.edu/tag/031V, which gives a criterion for a root of a polynomial over a field `k` of characteristic `p` to be a `p`-th power.
---
[](https://gitpod.io/from-referrer/)
|
t-algebra
new-contributor
label:t-algebra$ |
88/0 |
Mathlib.lean,Mathlib/FieldTheory/PthPowerCoeffPoly.lean |
2 |
1 |
['github-actions'] |
nobody |
26-75988 26 days ago |
unknown |
unknown |
| 33299 |
kingiler author:kingiler |
feat: Add decidable membership for Interval |
Implemented membership and corresponding decidable instance for `Interval`.
Related [#mathlib4 > Proposal: Add decidable membership for Interval](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Proposal.3A.20Add.20decidable.20membership.20for.20Interval/with/565438009).
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
new-contributor
t-order
|
16/1 |
Mathlib/Order/Interval/Basic.lean |
1 |
5 |
['Vierkantor', 'eric-wieser', 'github-actions', 'kingiler'] |
Vierkantor assignee:Vierkantor |
26-67794 26 days ago |
26-67794 26 days ago |
13-40294 13 days |
| 32744 |
NoneMore author:NoneMore |
feat(ModelTheory/Definablity): add `DefinableFun` definition and lemmas |
This PR adds two basic shapes of definable sets and `DefinableFun` definition with relevant lemmas.
The main result is `Set.Definable.preimage_of_map` asserting that the preimage of a definable set under a definable map is definable.
There are also some tool lemmas derived by the preimage lemma.
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-logic
|
147/0 |
Mathlib/ModelTheory/Definability.lean |
1 |
59 |
['NoneMore', 'github-actions', 'mathlib4-merge-conflict-bot', 'staroperator'] |
fpvandoorn assignee:fpvandoorn |
26-18697 26 days ago |
26-17176 26 days ago |
53-46057 53 days |
| 30142 |
shalliso author:shalliso |
feat(Topology/Baire): define IsNonMeagre |
non-meagre sets (also known as "of the second category") are worthy of their own definition and API. This was useful to me for formalizing a result of "automatic continuity", that is, a Baire-measurable homomorphism between Polish groups must be continuous. Simply working with the negation of IsMeagre quickly became cumbersome, and non-meagre sets have an important role in the study of Polish (e.g. locally compact) groups.
From https://github.com/shalliso/automatic_continuity
[ ] depends on: #30141
---
[](https://gitpod.io/from-referrer/)
|
t-topology
new-contributor
merge-conflict
|
83/1 |
Mathlib/Topology/Baire/NonMeagre.lean,Mathlib/Topology/GDelta/Basic.lean |
2 |
2 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
25-77478 25 days ago |
124-49921 124 days ago |
0-4 4 seconds |
| 32881 |
foderm author:foderm |
feat(AlgebraicTopology/SimplicialObject): define simplicial homotopy |
This file defines the notion of a combinatorial simplicial homotopy between two morphisms of simplicial objects.
A first step towards proving homotopy invariance of simplicial homotopy. See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/335062-homology/topic/Homotopy.20invariance.20of.20singular.20homology/with/562221688).
I left in most of my comments to make it easier to understand what indices I used, since I had to shift most of them by 1 to avoid proofs of neq 0 or similar things. I guess they can be removed once we know that the equations are the correct ones.
Additionally I added some simp lemmas and an identity, I hope this is more or less how this is usually done.
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-algebraic-topology
awaiting-author
|
546/0 |
Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialObject/ChainHomotopy.lean,Mathlib/AlgebraicTopology/SimplicialObject/SimplicialHomotopy.lean,Mathlib/AlgebraicTopology/SingularHomology/HomotopyInvariance.lean |
4 |
16 |
['github-actions', 'joelriou'] |
nobody |
25-61256 25 days ago |
51-53300 51 days ago |
0-9663 2 hours |
| 26168 |
oliver-butterley author:oliver-butterley |
feat(MeasureTheory.VectorMeasure): variation defined as a supremum is equal to variation defined using the Hahn-Jordan decomposition |
Add `signedMeasure_totalVariation_eq`: if `μ` is a `SignedMeasure` then variation defined as a supremum is equal to variation defined using the Hahn-Jordan decomposition.
Co-authored-by: @yoh-tanimoto
- [ ] depends on: #26165
---
[](https://gitpod.io/from-referrer/)
|
blocked-by-other-PR
new-contributor
t-measure-probability
|
916/0 |
Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Integral.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Equiv.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean |
5 |
3 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
25-46203 25 days ago |
214-9926 214 days ago |
15-64852 15 days |
| 33668 |
Citronhat author:Citronhat |
feat(PMF): add lintegral formulas for PMF |
This PR introduces two lemmas describing the `lintegral` of a function with respect to the measure induced by a probability mass function:
- `PMF.lintegral_eq_tsum`
- `PMF.lintegral_eq_sum`
These are the `ℝ≥0∞` analogues of the existing Bochner `integral` formulas `integral_eq_tsum` and `integral_eq_sum`. They could be useful for reasoning about expectations and integrability.
In addition, the proof of `integral_eq_sum` is simplified by deriving it directly from `integral_eq_tsum` using `tsum_fintype`. |
t-measure-probability
new-contributor
|
14/5 |
Mathlib/Probability/ProbabilityMassFunction/Integrals.lean |
1 |
1 |
['github-actions'] |
kex-y assignee:kex-y |
25-39453 25 days ago |
28-43759 28 days ago |
28-74915 28 days |
| 33688 |
Citronhat author:Citronhat |
feat(PMF): add expectation lemmas for Poisson PMF |
This PR adds some basic results about the Poisson distribution, its `PMF`, and its expectation.
**New lemmas:**
* `poissonPMF_apply` — an unfolding lemma for `poissonPMF`.
* `poissonPMFReal_mul_eq_succ_mul` — the standard recursion identity for the Poisson mass function.
* `poissonPMFReal_hasSum_nmul` — shows that `fun n ↦ poissonPMFReal r n * n` has sum `r`.
* `poissonPMF_tsum_nmul` — the corresponding identity at the level of the `PMF`.
* `poissonPMF_coe_tsum_nmul` — the same result after coercion to `ℝ`.
Both `ℝ`-valued and `ℝ≥0∞`-valued formulations are included so that these results can be used conveniently in both Lebesgue and Bochner integration contexts. |
new-contributor
t-measure-probability
|
21/0 |
Mathlib/Probability/Distributions/Poisson.lean |
1 |
2 |
['Citronhat', 'github-actions'] |
urkud assignee:urkud |
25-39450 25 days ago |
27-49764 27 days ago |
28-44731 28 days |
| 29960 |
yonggyuchoimath author:yonggyuchoimath |
feat(Algebra/Category/Ring): equalizers of pushout maps of tensor product inclusions |
This PR defines a ring map `S →ₗ[R] S ⊗[R] S : s ↦ (s ⊗ₜ[R] 1) - (1 ⊗ₜ[R] s)` for an `R`-algebra `S`, and show that its kernel is exactly (the image of) `R` if `S` is faithfully flat over `R`.
Changes:
* `TensorProduct.AlgebraTensorModule.distribBaseChange`: Origianlly takes `M` and `N`, where `M` is an `R`-module with an additional instance `IsScalarTower R A M`. This is unnecessary, so I changed the `M` and `N` into `N` and `Q`, now both of which are merely modules over `R`.
Main results :
* Add compatibility of `Algebra.TensorProduct.includeLeft` (or `Algebra.TensorProduct.includeRight`) with `TensorProduct.AlgebraTensorModule.distribBaseChange` and `LinearMap.lTensor`
* Define `Algebra.TensorProduct.includeLeftSubRight`, which is the `R`-linear map `S →ₗ[R] S ⊗[R] S` sending `s : S` to `(s ⊗ₜ[R] 1) - (1 ⊗ₜ[R] s)`.
* `Algebra.isEffective_of_faithfullyFlat`: the pair `algebraMap : R → S` and `includeLeftSubRight R S : S → S ⊗[R] S` is exact if `S` is a faithfully flat `R`-algebra.
---
- [x] depends on: #30806 |
new-contributor
awaiting-author
t-ring-theory
|
214/1 |
Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/TensorProduct/IncludeLeftSubRight.lean,Mathlib/RingTheory/TensorProduct/Maps.lean |
4 |
28 |
['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'yonggyuchoimath'] |
PatrickMassot and erdOne assignee:PatrickMassot assignee:erdOne |
24-75516 24 days ago |
24-75516 24 days ago |
56-64488 56 days |
| 33233 |
jazzits author:jazzits |
feat(GroupTheory): add chosen group presentations and finitely presented groups |
This PR adds "chosen" generating systems and presentations of a group, and uses it
to define and develop very basic notions around finitely presented groups in a way that integrates with
`Mathlib.GroupTheory.PresentedGroup`.
Main additions:
* New file `Mathlib/GroupTheory/Presentation.lean`:
- `Group.GeneratingSystem` and `Group.Presentation` (with kernel = normal closure hypothesis)
- the canonical map `Presentation.toGroup`
- an isomorphism `Presentation.equivPresentedGroup : PresentedGroup P.rels ≃* G`
- transport of presentations along a group isomorphism (`Presentation.mapMulEquiv`)
* New file `Mathlib/GroupTheory/FinitelyPresented.lean`:
- `Group.FinitelyPresented` defined as existence of a finite presentation
- equivalence `FinitelyPresented ↔ ∃ rels, PresentedGroup rels ≃* G` with finiteness hypotheses
- canonical presentation of `PresentedGroup rels`
- finitely presented groups are finitely generated
The development is designed to reuse the existing `PresentedGroup` construction and avoids
introducing a new quotient model for presented groups.
No existing definitions are modified
|
t-group-theory
new-contributor
awaiting-author
|
442/0 |
Mathlib.lean,Mathlib/GroupTheory/FinitelyPresented.lean,Mathlib/GroupTheory/Presentation.lean |
3 |
13 |
['github-actions', 'homeowmorphism', 'jazzits', 'kbuzzard', 'plp127', 'tb65536'] |
tb65536 assignee:tb65536 |
22-76112 22 days ago |
36-77500 36 days ago |
5-43644 5 days |
| 32880 |
0xTerencePrime author:0xTerencePrime |
feat(Analysis/Asymptotics): define subpolynomial growth |
## Main definitions
* `Asymptotics.IsSubpolynomial l f g`: A function `f` has subpolynomial growth with respect to `g` along filter `l` if `f = O(1 + ‖g‖^k)` for some natural `k`.
## Main results
* `IsSubpolynomial.const`: Constant functions have subpolynomial growth
* `IsSubpolynomial.id`: Identity has subpolynomial growth
* `IsSubpolynomial.add`: Closure under addition
* `IsSubpolynomial.neg`: Closure under negation
* `IsSubpolynomial.sub`: Closure under subtraction
* `IsSubpolynomial.mul`: Closure under multiplication
* `IsSubpolynomial.pow`: Closure under powers
* `isSubpolynomial_iff_one_add`: Equivalence with `(1 + ‖g‖)^k` formulation
* `IsSubpolynomial.uniform`: Uniform bounds for finite families
## Implementation notes
The definition uses `1 + ‖g‖^k` rather than `(1 + ‖g‖)^k` as the primary form, with the equivalence established in `isSubpolynomial_iff_one_add`. Four private auxiliary lemmas handle the key inequalities needed for closure proofs.
Closes #32658
|
awaiting-author
t-analysis
new-contributor
|
185/0 |
Mathlib.lean,Mathlib/Analysis/Asymptotics/Subpolynomial.lean |
2 |
28 |
['0xTerencePrime', 'ADedecker', 'github-actions', 'j-loreaux'] |
ADedecker assignee:ADedecker |
22-60562 22 days ago |
23-42020 23 days ago |
22-12319 22 days |
| 33786 |
hdmkindom author:hdmkindom |
feat(Analysis/Matrix): add Jacobian matrix for matrix-valued functions |
This PR introduces the Jacobian matrix for matrix-valued functions `F : Matrix m n ℝ → Matrix p q ℝ`.
The Jacobian matrix `jacobianMatrix F X` at point `X` is indexed by `(p × q) × (m × n)`, where each entry represents the partial derivative with respect to a basis element. To handle instance-mismatch issues with matrix norms, we use local Frobenius norm instances.
mkdir Analysis/Matrix/Jacobian.lean
## Main definitions
- `jacobianMatrix F X`: The Jacobian matrix at point `X`, defined by `jacobianMatrix F X (i, k) (j, l) = (fderiv ℝ F X (Matrix.single j l 1)) i k`
## Main theorems
- `fderiv_eq_jacobian_mul`: Express the Fréchet derivative as a contraction with the Jacobian
- `jacobianMatrix_comp`: Chain rule for Jacobian matrices
- `jacobianMatrix_linear`, `jacobianMatrix_id`, `jacobianMatrix_const`: Basic properties
- `jacobianMatrix_add`, `jacobianMatrix_smul`: Linearity properties
|
t-analysis
new-contributor
|
219/0 |
Mathlib.lean,Mathlib/Analysis/Matrix/Jacobian.lean |
2 |
1 |
['github-actions'] |
ADedecker assignee:ADedecker |
22-39454 22 days ago |
25-74129 25 days ago |
26-17945 26 days |
| 33118 |
thomaskwaring author:thomaskwaring |
feat(Combinatorics/SimpleGraph/Acyclic): every graph has a spanning forest. |
We show that every graph has a spanning forest: defined to be an acyclic subgraph with the same reachability relation as the larger graph. As a special case, every connected graph has a spanning tree.
---
Each of these results (spanning forest & spanning tree) are proved in two versions: a general case where the forest / tree is found by extending a given acyclic subgraph, and the special case where that subgraph is empty.
- [ ] depends on: #32043 |
new-contributor
t-combinatorics
|
29/5 |
Mathlib/Combinatorics/SimpleGraph/Acyclic.lean |
1 |
6 |
['SnirBroshi', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'thomaskwaring', 'vlad902'] |
b-mehta assignee:b-mehta |
21-39435 21 days ago |
31-36138 31 days ago |
32-21791 32 days |
| 33948 |
anivegesana author:anivegesana |
feat(Analysis/Normed/Algebra): matrix exponential of nilpotent matrix |
Where the matrix exponential and nilpotent elements are defined, both the matrix exponential and the nilpotent element exponential. I had to add a different theorem for normed space exponential and the matrix exponential since the right instances wouldn't be synthesized. Help with golfing would be appreciated.
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-analysis
|
34/0 |
Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean |
2 |
1 |
['github-actions'] |
nobody |
21-25147 21 days ago |
unknown |
unknown |
| 26986 |
WangYiran01 author:WangYiran01 |
feat(Partition): add bijection for partitions with max part ≤ r |
This PR adds a new theorem `partition_max_equals_bound` to `Mathlib.Combinatorics.Enumerative.Partition`.
It constructs a bijection between:
- The set of partitions of `n` in which `r ∈ π.parts` and all parts are `≤ r`, and
- The set of partitions of `n - r` whose largest part is at most `r`.
This provides a constructive proof via removing/adding `r` from/to the partition multiset, in line with classical enumerative combinatorics.
Contributed by Yiran Wang.
|
awaiting-author
t-combinatorics
new-contributor
|
92/0 |
Mathlib/Combinatorics/Enumerative/Partition/Basic.lean,Mathlib/Data/Multiset/Lattice.lean |
2 |
19 |
['WangYiran01', 'github-actions', 'jcommelin', 'kckennylau', 'kim-em', 'mathlib4-merge-conflict-bot'] |
b-mehta assignee:b-mehta |
21-15576 21 days ago |
27-9538 27 days ago |
120-65801 120 days |
| 31610 |
rudynicolop author:rudynicolop |
feat(Computability/NFA): Kleene star closure for Regular Languages via NFA |
This PR constructs a Kleene star closure for non-epsilon NFAs, and proves that regular languages are closed under Kleene star. The NFA construction is `NFA.kstar`. The main theorems are:
- `NFA.accepts_kstar`: demonstrates that `M.kstar` accepts the Kleene star closure of the language of `M`.
- `IsRegular.kstar`: demonstrates that regular languages are closed under Kleene star.
There is an onging zulip discussion about regular languages in Mathlib: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Regular.20languages.3A.20the.20review.20queue/with/553759136
This discussion is also tracked at #24205.
Furthermore, the construction and proofs in this PR are heavily inspired by @TpmKranz from his #15651. #15651 supersedes this PR, so if it is accepted then this PR is not needed.
---
- [x] depends on: #31038
[](https://gitpod.io/from-referrer/)
|
t-computability
new-contributor
awaiting-author
awaiting-CI
|
405/7 |
Mathlib/Computability/NFA.lean |
1 |
16 |
['YaelDillies', 'ctchou', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
YaelDillies assignee:YaelDillies |
20-62300 20 days ago |
20-62300 20 days ago |
43-73349 43 days |
| 31366 |
FaffyWaffles author:FaffyWaffles |
feat(Analysis/SpecialFunctions/StirlingRobbins): Robbins' sharp stepwise bound for stirlingSeq |
Introduces `Mathlib.Analysis.SpecialFunctions.StirlingRobbins`,
proving Robbins' sharp stepwise bound for the Stirling sequence.
* Main theorem: `log_stirlingSeq_diff_le`
* Improves the existing bound `1/(4k^2)` to the sharp `1/(12k(k+1))`
* Adds helper lemmas on summability and geometric bounds
* Complements `Stirling.lean`
References:
- https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/SpecialFunctions/Stirling.html
- Robbins (1955), *A Remark on Stirling’s Formula*
---
**Note for Transparency:** Assistance provided by AI tools (Claude and Aristotle) for drafting, text, and structure.
[](https://gitpod.io/from-referrer/)
|
t-analysis
new-contributor
awaiting-author
|
64/5 |
Mathlib/Analysis/SpecialFunctions/Stirling.lean |
1 |
16 |
['FaffyWaffles', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'tb65536'] |
nobody |
19-48547 19 days ago |
70-50941 70 days ago |
4-54198 4 days |
| 30391 |
rudynicolop author:rudynicolop |
feat(Data/List): list splitting definitions and lemmas |
This PR continues the work from #24395.
Original PR: https://github.com/leanprover-community/mathlib4/pull/24395 |
t-data
new-contributor
awaiting-author
|
108/2 |
Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/List/TakeDrop.lean |
2 |
50 |
['BoltonBailey', 'IlPreteRosso', 'TwoFX', 'Vierkantor', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'rudynicolop'] |
TwoFX assignee:TwoFX |
18-78893 18 days ago |
19-1015 19 days ago |
91-66874 91 days |
| 29713 |
jessealama author:jessealama |
feat (Algebra/Homology): add Euler–Poincaré formula |
This PR builds on the generalized Euler characteristic framework from #31121 to prove the Euler-Poincaré formula for chain complexes.
PR #31121 defines the Euler characteristic for general homological complexes. This PR specializes those definitions to ℤ-indexed chain complexes and proves the main Euler-Poincaré theorem.
### Main result (in `EulerPoincare.lean`)
* `ChainComplex.eulerChar_eq_homologyEulerChar`: For ℤ-indexed bounded chain complexes of finite-dimensional modules over a division ring, the alternating sum of chain dimensions equals the alternating sum of homology dimensions.
---
Builds on: #31121
Related to: #29639, #29643, #29646 |
awaiting-author
t-algebra
new-contributor
label:t-algebra$ |
515/0 |
Mathlib.lean,Mathlib/Algebra/Homology/EulerCharacteristic.lean,Mathlib/Algebra/Homology/EulerPoincare.lean |
3 |
24 |
['github-actions', 'jessealama', 'joelriou', 'kim-em', 'mathlib4-merge-conflict-bot'] |
dagurtomas assignee:dagurtomas |
18-73184 18 days ago |
102-14024 102 days ago |
35-25302 35 days |
| 33838 |
chainstart author:chainstart |
feat(NumberTheory): add unitary divisors and unitary perfect numbers |
## Summary
This PR introduces the unitary divisor sum function σ* to Mathlib and proves that no odd unitary perfect numbers exist.
## Main Definitions
- `Nat.UnitaryDivisor d n`: A divisor `d` of `n` is unitary if `gcd(d, n/d) = 1`
- `Nat.unitaryDivisors n`: The `Finset` of all unitary divisors of `n`
- `Nat.unitaryDivisorSum n` (notation `σ*`): Sum of all unitary divisors
- `Nat.UnitaryPerfect n`: `n` is unitary perfect if `σ*(n) = 2n`
## Main Theorems
**Multiplicativity:**
- `unitaryDivisorSum_mul`: For coprime `m`, `n`, `σ*(mn) = σ*(m) · σ*(n)`
- Proved via explicit bijection between unitary divisors of `mn` and pairs of unitary divisors
**Prime Powers:**
- `unitaryDivisors_prime_pow`: The unitary divisors of `p^k` are exactly `{1, p^k}`
- `unitaryDivisorSum_prime_pow`: For prime `p` and `k ≥ 1`, `σ*(p^k) = p^k + 1`
**Unitary Perfect Numbers:**
- `no_odd_unitary_perfect`: There are no odd unitary perfect numbers > 1 (Subbarao-Warren 1966)
- `UnitaryPerfect.even`: Every unitary perfect number is even
- `UnitaryPerfect.eq_two_pow_mul_odd`: Every unitary perfect number has form `2^a · k` with `a ≥ 1`, `k` odd
## Mathematical Background
A unitary perfect number is a positive integer `n` such that the sum of its unitary divisors equals `2n`. This generalizes the classical perfect numbers. Only five unitary perfect numbers are known: 6, 60, 90, 87360, and one with 24 digits.
The main theorem (no odd unitary perfect numbers) was originally proved by Subbarao & Warren (1966) using prime factorization arguments. Our formalization uses `Nat.recOnPrimeCoprime` for structural induction.
## References
- Subbarao, M. V., & Warren, L. J. (1966). Unitary perfect numbers. *Canadian Mathematical Bulletin*, 9(2), 147-153.
- Wall, C. R. (1975). The fifth unitary perfect number. *Canadian Mathematical Bulletin*, 18(1), 115-122.
## Code Statistics
- **Files**: 2
- **Lines**: ~520
- **Theorems**: 21 public declarations
- **Sorry count**: 0
## Checklist
- [x] All theorem names follow mathlib conventions
- [x] All lines ≤ 100 characters
- [x] All public theorems have docstrings
- [x] No `sorry` or `admit`
- [x] Code builds successfully
- [ ] CI tests pass (awaiting verification) |
new-contributor
t-number-theory
|
554/0 |
Mathlib.lean,Mathlib/NumberTheory/UnitaryDivisor.lean,Mathlib/NumberTheory/UnitaryPerfect.lean |
3 |
17 |
['Ruben-VandeVelde', 'SnirBroshi', 'chainstart', 'github-actions', 'riccardobrasca', 'tb65536'] |
riccardobrasca assignee:riccardobrasca |
17-79104 17 days ago |
17-84655 17 days ago |
23-78069 23 days |
| 33240 |
khwilson author:khwilson |
feat(Mathlib/Analysis/Polynomial/Norm): Introduce Polynomial.supNorm |
The supNorm (often called the height) of a polynomial is the max of the norm of its coefficients. Used extensively in arithmetic statistics and will support further work on counting polynomials with certain properties.
---
[](https://gitpod.io/from-referrer/)
|
t-analysis
new-contributor
awaiting-author
|
125/0 |
Mathlib.lean,Mathlib/Analysis/Normed/Unbundled/RingSeminorm.lean,Mathlib/Analysis/Polynomial/MahlerMeasure.lean,Mathlib/Analysis/Polynomial/Norm.lean |
4 |
61 |
['MichaelStollBayreuth', 'fbarroero', 'github-actions', 'j-loreaux', 'khwilson', 'mathlib4-merge-conflict-bot', 'vihdzp'] |
j-loreaux assignee:j-loreaux |
17-71975 17 days ago |
28-71286 28 days ago |
4-76653 4 days |
| 34005 |
MSpill author:MSpill |
feat: inverse function theorem for manifolds (concrete version) |
Proves the inverse function theorem for manifolds: given manifolds $M, N$ and a $C^n$ map $f : M \to N$ whose differential is a linear isomorphism at $p \in M$, then $f$ is a local diffeomorphism at $p$, provided that both $p$ and its image are interior points. The proof proceeds in 4 main steps:
1. Define composition of partial diffeomorphisms
2. Show that the extended chart at an interior point can be restricted to an open set on which it is a partial diffeomorphism, viewing the model vector space as a manifold modelled on itself trivially
3. Use the inverse function theorem (applied to $f$ written in coordinates) to obtain a partial diffeomorphism between model vector spaces
4. Compose with chart diffeomorphisms to obtain a partial diffeomorphism between the manifolds.
------
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-differential-geometry
new-contributor
|
232/3 |
Mathlib/Geometry/Manifold/LocalDiffeomorph.lean |
1 |
11 |
['MSpill', 'github-actions', 'grunweg'] |
grunweg assignee:grunweg |
17-68844 17 days ago |
unknown |
unknown |
| 29282 |
Jlh18 author:Jlh18 |
feat(CategoryTheory): HasColimits instance on Grpd |
Show that the category of groupoids has all small colimits, as a coreflective subcategory of `Cat`, which has all small colimits. The right adjoint of the forgetful functor is the core functor `CategoryTheory.Core.functor`.
- [ ] depends on: #29283 [Core of a category as a functor]
---
[](https://gitpod.io/from-referrer/)
|
merge-conflict
blocked-by-other-PR
new-contributor
t-category-theory
|
140/4 |
Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Colimit.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Core.lean |
6 |
3 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
17-2573 17 days ago |
unknown |
unknown |
| 33709 |
wangying11123 author:wangying11123 |
feat(Analysis/Convex/Between): betweenness from differences on the same ray |
Add `wbtw_of_sameRay_vsub_left`, saying that if the vectors from a point x to points y and z lie on the same ray, then y is weakly between x and z, or z is weakly between x and y. |
new-contributor
t-convex-geometry
|
24/0 |
Mathlib/Analysis/Convex/Between.lean |
1 |
8 |
['MichaelStollBayreuth', 'YaelDillies', 'github-actions', 'wangying11123'] |
nobody |
16-75191 16 days ago |
16-75191 16 days ago |
26-81733 26 days |
| 33712 |
wangying11123 author:wangying11123 |
feat(Geometry/Euclidean/Angle/Unoriented/Projection): Add sameray_orthogonalProjection_vsub_of_angle_lt |
Add sameray_orthogonalProjection_vsub_of_angle_lt
`sameray_orthogonalProjection_vsub_of_angle_lt`
When an angle is acute, the vector to the orthogonal projection lies in the same ray as the given direction vector. |
new-contributor
t-euclidean-geometry
|
20/0 |
Mathlib/Geometry/Euclidean/Angle/Unoriented/Projection.lean |
1 |
3 |
['JovanGerb', 'github-actions'] |
JovanGerb assignee:JovanGerb |
16-41921 16 days ago |
20-73278 20 days ago |
25-77008 25 days |
| 32039 |
HugLycan author:HugLycan |
feat(Tactic/Positivity): handle non-zeroness in non-orders |
---
WIP...
[](https://gitpod.io/from-referrer/)
|
WIP
new-contributor
t-meta
merge-conflict
|
618/163 |
Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Algebra/Order/BigOperators/Expect.lean,Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Field/Power.lean,Mathlib/Algebra/Order/Module/Algebra.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Positivity/Finset.lean,Mathlib/Tactic/Positivity/test_Basic.lean |
10 |
3 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
16-9027 16 days ago |
unknown |
unknown |
| 32745 |
LTolDe author:LTolDe |
feat(Topology/Algebra): add MulActionConst.lean |
add Topology/Algebra/MulActionConst.lean
introduce class `ContinuousSMulConst` for a scalar multiplication that is continuous in the first argument, in analogy to `ContinuousConstSMul`
define `MulAction.ball x U` as the set `U • {x}` given `[SMul G X] (x : X) (U : Set G)`
The lemmas shown here will be useful to prove the **Effros Theorem**, see [zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Effros.20Theorem/with/558712441).
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
new-contributor
t-topology
|
117/0 |
Mathlib.lean,Mathlib/Topology/Algebra/MulActionConst.lean |
2 |
8 |
['LTolDe', 'github-actions', 'urkud'] |
dagurtomas assignee:dagurtomas |
15-74839 15 days ago |
22-54369 22 days ago |
16-30636 16 days |
| 34026 |
SnkXyx author:SnkXyx |
feat(Algebra/MvPolynomial): add mainVariable |
Add `mainVariable` of `MvPolynomial`, the largest variable index appearing in the polynomial.
Main Theorems:
* `mainVariable_eq_bot_iff_eq_C`
* `mainVariable_sum_le`
* `mainVariable_prod_le`
* `degreeOf_eq_zero_of_mainVariable_lt`
---
[](https://gitpod.io/from-referrer/)
|
t-algebra
new-contributor
label:t-algebra$ |
147/0 |
Mathlib.lean,Mathlib/Algebra/MvPolynomial/MainVariable.lean |
2 |
1 |
['github-actions'] |
dagurtomas and joelriou assignee:dagurtomas assignee:joelriou |
15-39455 15 days ago |
19-24327 19 days ago |
19-23805 19 days |
| 33478 |
anishrajeev author:anishrajeev |
feat(ModelTheory): define a subset of the topology over complete types |
Define a subset of the Stone Space over a language expanded with countably many constants. Define the proposition to indicate if a language is countable. The subset's density and openness is a future goal to prove (have a branch where it is almost finished), in pursuit of formalizing the proof of the Omitting Types Theorem via properties of Baire spaces.
- [ ] depends on: #32215
- [ ] depends on: #32546 |
t-logic
blocked-by-other-PR
merge-conflict
new-contributor
|
160/1 |
Mathlib.lean,Mathlib/ModelTheory/Topology/Types.lean,Mathlib/ModelTheory/Types.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean |
4 |
8 |
['NoneMore', 'anishrajeev', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'tb65536'] |
nobody |
14-68358 14 days ago |
22-82182 22 days ago |
10-30503 10 days |
| 32546 |
anishrajeev author:anishrajeev |
feat(ModelTheory): Prove compactness of the type space |
Define the space of types and prove various topological properties of it (zero dimensional, totally separated, compact, baire).
The goal is to formalize the proof of the Omitting Types Theorem
- [ ] depends on: #32215 |
merge-conflict
t-logic
new-contributor
|
127/1 |
Mathlib.lean,Mathlib/ModelTheory/Topology/Types.lean,Mathlib/ModelTheory/Types.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean |
4 |
6 |
['NoneMore', 'anishrajeev', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
fpvandoorn assignee:fpvandoorn |
14-68308 14 days ago |
unknown |
unknown |
| 34068 |
leomayer1 author:leomayer1 |
feat: give functor categories an instance of `HasBinaryBiproducts` |
---
[](https://gitpod.io/from-referrer/)
|
t-category-theory
new-contributor
|
144/0 |
Mathlib.lean,Mathlib/CategoryTheory/Limits/FunctorCategory/BinaryBiproducts.lean |
2 |
1 |
['github-actions'] |
nobody |
14-64278 14 days ago |
unknown |
unknown |
| 33493 |
michelsol author:michelsol |
feat(RingTheory/Polynomial): An explicit formula for the Chebyshev polynomials of the first kind |
Adds the following explicit formula on the Chebyshev polynomial of the first kind of order n.
${ T_{n}(x)\ =\ \sum \limits _{k=0}^{\lfloor {\frac {n}{2}}\rfloor } {\binom {n}{2k}} \left(\ X^{2}-1\ \right)^{k}\ X^{n-2k}}$
This explicit formula can be found [here](https://en.wikipedia.org/wiki/Chebyshev_polynomials#Explicit_expressions). There is a proof using complex numbers but it only works if the ring R = ℂ.
The proof here is by induction and works in a commutative ring R.
Mathlib seems to extend the definition of Chebyshev polynomials for $n \in \mathbb{Z}$ but this would make the formula more cumbersome with `n.natAbs` in place of `n`'s, so I expressed it on `n : ℕ` directly.
---
[](https://gitpod.io/from-referrer/)
|
t-ring-theory
new-contributor
|
51/1 |
Mathlib/RingTheory/Polynomial/Chebyshev.lean |
1 |
8 |
['YuvalFilmus', 'erdOne', 'github-actions', 'metakunt', 'michelsol'] |
chrisflav assignee:chrisflav |
14-39453 14 days ago |
30-61408 30 days ago |
31-51557 31 days |
| 33901 |
martinwintermath author:martinwintermath |
feat(LinearAlgebra/Span): add inter/union/sInf/sSup lemmas for Submodule.span |
This PR adds theorems about the interaction of `Submodule.span` with the lattice operations:
* `inter`, `sInf` and `biInter` lemmas for `Submodule.span`
* `union`, `sSup` and `biUnion` lemmas for `Submodule.span`
It also adds `@[simp]` to `span_union`
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-algebra
label:t-algebra$ |
25/0 |
Mathlib/LinearAlgebra/Span/Defs.lean |
1 |
3 |
['github-actions', 'themathqueen'] |
kim-em assignee:kim-em |
14-1428 14 days ago |
21-71599 21 days ago |
21-71077 21 days |
| 33793 |
LTolDe author:LTolDe |
feat(MeasureTheory/Constructions/Polish/Basic): add lemma AnalyticSet.inter_nonempty_of_nowhereMeagre |
add lemma AnalyticSet.inter_nonempty_of_nowhereMeagre, the main ingredient for the proof of the **Effros' Theorem**, see [#mathlib4 > Effros Theorem](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Effros.20Theorem/with/566543328)
introduce definition of a nowhere meagre set
---
[](https://gitpod.io/from-referrer/)
|
t-measure-probability
new-contributor
|
37/0 |
Mathlib/MeasureTheory/Constructions/Polish/Basic.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Topology/GDelta/Basic.lean |
3 |
2 |
['MichaelStollBayreuth', 'github-actions'] |
kex-y assignee:kex-y |
13-74555 13 days ago |
13-72038 13 days ago |
25-72472 25 days |
| 31180 |
CoolRmal author:CoolRmal |
feat(Analysis): a closed convex set is the intersection of countably many half-spaces in a separable Banach space |
This lemma is needed in the proof of conditional Jensen's inequality: #27953
---
[](https://gitpod.io/from-referrer/)
|
t-analysis
new-contributor
merge-conflict
awaiting-author
|
70/13 |
Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Topology/Compactness/Lindelof.lean |
2 |
44 |
['ADedecker', 'CoolRmal', 'EtienneC30', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot'] |
nobody |
13-54670 13 days ago |
67-82040 67 days ago |
2-47050 2 days |
| 31092 |
FlAmmmmING author:FlAmmmmING |
feat(Algebra/Group/ForwardDiff.lean): Add theorem `sum_shift_eq_fwdDiff_iter`. |
---
[](https://gitpod.io/from-referrer/)
|
t-algebra
new-contributor
delegated
label:t-algebra$ |
17/1 |
Mathlib/Algebra/Group/ForwardDiff.lean |
1 |
20 |
['BeibeiX0', 'FlAmmmmING', 'Ruben-VandeVelde', 'dagurtomas', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib4-merge-conflict-bot'] |
dagurtomas assignee:dagurtomas |
12-75858 12 days ago |
12-75858 12 days ago |
54-13842 54 days |
| 34251 |
Yu-Misaka author:Yu-Misaka |
chore: drop `PartialOrder` on some `Finsupp` lemmas |
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
WIP
|
78/51 |
Mathlib/Algebra/Order/BigOperators/Group/Finset.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/BigOperators/Group/Multiset.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Tactic/Positivity/Finset.lean |
5 |
3 |
['Yu-Misaka', 'github-actions', 'leanprover-radar'] |
nobody |
12-75594 12 days ago |
unknown |
unknown |
| 34141 |
gululu996-ui author:gululu996-ui |
feat(Combinatorics/SimpleGraph/Acyclic): finite trees have at least two degree-one vertices |
Add a lemma showing that a finite tree with at least two vertices has at least two vertices of degree 1.
- Introduce a helper lemma `SimpleGraph.Connected.one_le_degree` for connected graphs on a nontrivial finite type.
- Prove the leaf-count lower bound via the degree-sum identity and a counting argument.
---
|
awaiting-author
new-contributor
t-combinatorics
|
72/2 |
Mathlib/Combinatorics/SimpleGraph/Acyclic.lean |
1 |
9 |
['IvanRenison', 'SnirBroshi', 'github-actions', 'vlad902'] |
nobody |
12-72116 12 days ago |
14-53552 14 days ago |
1-21793 1 day |
| 31670 |
edwin1729 author:edwin1729 |
feat(Topology/Order): Scott Topology is Sober over Algebraic DCPO |
---
[Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.3E.20Algebraic.20complete.20partial.20order.20and.20domain.20theory/with/536359313) here
(2/2) PR to prove result in Stone Duality. Here we prove that Scott Topologies over Algebraic DCPOs are sober.
- [ ] depends on: #31662
[](https://gitpod.io/from-referrer/)
|
t-topology
blocked-by-other-PR
new-contributor
|
473/1 |
Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib |
4 |
3 |
['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot'] |
nobody |
12-60708 12 days ago |
unknown |
unknown |
| 34129 |
idontgetoutmuch author:idontgetoutmuch |
feat: define Ehresmann connections |
---
[](https://gitpod.io/from-referrer/)
|
awaiting-author
t-differential-geometry
new-contributor
|
90/0 |
Mathlib.lean,Mathlib/Geometry/Manifold/EhresmannConnection.lean |
2 |
5 |
['github-actions', 'grunweg', 'idontgetoutmuch', 'metakunt'] |
nobody |
12-7266 12 days ago |
unknown |
unknown |
| 33214 |
JJYYY-JJY author:JJYYY-JJY |
chore(Data/List/Rotate): add simp attributes |
* Refs #7987 (SC: Data/List/Rotate)
* Add `@[simp]` to: `rotate_mod`, `rotate'_nil`, `rotate'_rotate'`, `rotate'_mod`, `rotate_rotate`, `getElem?_rotate`, `getElem_rotate`, `head?_rotate`, `map_rotate`.
* Verification: `lake build Mathlib.Data.List.Rotate`. |
t-data
new-contributor
awaiting-author
|
7/0 |
Mathlib/Data/List/Rotate.lean |
1 |
2 |
['github-actions', 'joneugster'] |
joneugster assignee:joneugster |
11-62020 11 days ago |
11-62020 11 days ago |
31-42522 31 days |
| 33355 |
0xTerencePrime author:0xTerencePrime |
feat(Combinatorics/SimpleGraph/Connectivity): define vertex connectivity |
This PR introduces the foundations of vertex connectivity for simple graphs, providing a counterpart to the edge connectivity theory in #32870.
### Main definitions
- `SimpleGraph.IsVertexReachable`: vertices remain reachable after removing strictly fewer than `k` other vertices.
- `SimpleGraph.IsVertexConnected`: a graph is `k`-vertex-connected if its order is strictly greater than `k` and any two distinct vertices are `k`-vertex-reachable.
Includes basic characterizations for $k=0$ and $k=1$, along with monotonicity lemmas (`anti` and `mono`). |
awaiting-author
new-contributor
t-combinatorics
|
154/0 |
Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/VertexConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/IsolateVerts.lean |
3 |
106 |
['0xTerencePrime', 'SnirBroshi', 'YaelDillies', 'github-actions', 'vihdzp'] |
YaelDillies assignee:YaelDillies |
11-30162 11 days ago |
16-11287 16 days ago |
20-74274 20 days |
| 31662 |
edwin1729 author:edwin1729 |
feat(Topology/Order): topological basis of scott topology on Complete… |
…PartialOrder
---
[Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.3E.20Algebraic.20complete.20partial.20order.20and.20domain.20theory/with/536359313) for this PR.
(1/2) PRs in domain theory, proving that scott topologies over Algebraic DCPOs (`CompletePartialOrder`) are sober.
The main reference is [Reneta, Duality in Domain Theory](https://alyata.github.io/documents/duality_domain_theory.pdf). But the statements can also be found in the canonical text [Abramsky and Jung](https://www.cs.ox.ac.uk/people/samson.abramsky/handbook.pdf)
This first PR proves two prerequisites, namely:
- the specialization order induced by the scott topology corresponds to the existing order of the DCPO. Prop 3.1.5 in [Duality in Domain Theory](https://alyata.github.io/documents/duality_domain_theory.pdf) and Prop 2.3.2(1) in [Abramsky and Jung](https://www.cs.ox.ac.uk/people/samson.abramsky/handbook.pdf)
- the upward closures of compact elements of the DCPO form a topological basis for the Scott Topology. Prop 3.5.2 in [Duality in Domain Theory](https://alyata.github.io/documents/duality_domain_theory.pdf) and Prop 2.3.6(2) in [Abramsky and Jung](https://www.cs.ox.ac.uk/people/samson.abramsky/handbook.pdf)
- [ ] depends on: #33061
**The next PR is here:** #31670
[](https://gitpod.io/from-referrer/)
|
t-topology
new-contributor
awaiting-author
|
281/1 |
Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib |
4 |
41 |
['b-mehta', 'edwin1729', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'plp127'] |
b-mehta assignee:b-mehta |
11-5526 11 days ago |
11-5526 11 days ago |
6-22962 6 days |
| 26479 |
thefundamentaltheor3m author:thefundamentaltheor3m |
feat(Analysis/Complex/CauchyIntegral): Cauchy–Goursat for Unbounded Rectangles |
In this PR, we prove versions of the Cauchy-Goursat theorem where the contours in question are rectangular and unbounded (ie, where the contours look like the $\bigsqcup$ symbol). I am not sure if I have formalised these in the best way, or if `Analysis.Complex.CauchyIntegral` is the best place for them (it might be prudent to reorganise the file into multiple files at some point), but I believe this is a useful result. Suggestions welcome.
---
[](https://gitpod.io/from-referrer/)
|
new-contributor
t-analysis
sphere-packing
|
205/0 |
Mathlib/Analysis/Complex/CauchyIntegral.lean |
1 |
4 |
['github-actions', 'mathlib4-merge-conflict-bot', 'thefundamentaltheor3m', 'wwylele'] |
urkud assignee:urkud |
10-39443 10 days ago |
13-60618 13 days ago |
13-60096 13 days |
| 33443 |
sahanwijetunga author:sahanwijetunga |
feat: Define Isometries of Bilinear Spaces |
---
We define Isometries of Bilinear Spaces, closely following the implementation of isometries of quadratic spaces.
[](https://gitpod.io/from-referrer/)
|
t-algebra
new-contributor
label:t-algebra$ |
275/0 |
Mathlib.lean,Mathlib/LinearAlgebra/BilinearForm/Isometry.lean,Mathlib/LinearAlgebra/BilinearForm/IsometryEquiv.lean |
3 |
1 |
['github-actions'] |
mattrobball assignee:mattrobball |
10-39441 10 days ago |
20-40362 20 days ago |
33-66683 33 days |
| 34006 |
martinwintermath author:martinwintermath |
feat(RingTheory/Finiteness/Cofinite): co-finitely generated submodules |
Add new file `Cofinite.lean` that defines *co-finitely generated* (CoFG) submodules. The main definition is
* `Submodule.CoFG`: A submodule is CoFG if the quotient of the module by this submodule is finitely generated (FG).
Prove
* lattice operations for CoFG submodules.
* complements of FG submodules are CoFG and vice versa.
* the kernel of a linear map is CoFG if and only if the range is FG.
---
[](https://gitpod.io/from-referrer/)
|
t-ring-theory
new-contributor
maintainer-merge
|
108/0 |
Mathlib.lean,Mathlib/RingTheory/Finiteness/Cofinite.lean |
2 |
26 |
['erdOne', 'github-actions', 'jcommelin', 'martinwintermath', 'plp127', 'vihdzp'] |
erdOne assignee:erdOne |
9-39436 9 days ago |
13-13433 13 days ago |
16-13207 16 days |
| 33280 |
michelsol author:michelsol |
feat(MeasureTheory/Integral/IntervalIntegral): add variant `integral_deriv_eq_sub_uIoo` of 2nd theorem of calculus. |
Add a continuous on uIcc, differentiable on uIoo, deriv version of the 2nd fundamental theorem of calculus.
This corresponds to what is written [here](https://en.wikipedia.org/wiki/Fundamental_theorem_of_calculus#Second_part).
For example it makes it easier to compute the integral :
```lean4
∫ x : ℝ in 0..1, (√(1 - x ^ 2))⁻¹ = ∫ x : ℝ in 0..1, deriv arcsin x = arcsin 1 - arcsin 0
```
It is not possible to use [`interval_deriv_eq_sub`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.html#intervalIntegral.integral_deriv_eq_sub) which requires differentiability on all of [0,1], as `arcsin` isn't differentiable at 1.
---
[](https://gitpod.io/from-referrer/)
|
t-measure-probability
new-contributor
maintainer-merge
|
14/0 |
Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean |
1 |
4 |
['EtienneC30', 'github-actions'] |
EtienneC30 assignee:EtienneC30 |
8-66941 8 days ago |
40-64085 40 days ago |
40-63563 40 days |
| 34137 |
goliath-klein author:goliath-klein |
refactor(PiTensorProduct/{InjectiveNorm, ProjectiveNorm}): Remove `injectiveSeminorm` |
Currently, `injectiveSeminorm` is extensionally equal to `projectiveSeminorm`. Both implement what is commonly called the "projective tensor norm".
# Background
(C.f. [[Diestel et al.]](https://www.ams.org/bookstore/pspdf/mbk-52-prev.pdf)). On the algebraic tensor product of two Banach spaces X, Y, there are two distinguished norms. First the projective norm, or "largest reasonable crossnorm". Two equivalent expressions for it are:
(L1) `‖u‖_∧ = sup { sum_i ‖x_i‖ ‖y_i‖ | sum_i x_i ⊗ y_i = u }`,
(L2) `‖u‖_∧ = norm of the linear map that sends b : B(X,Y; 𝕂) to (lift b) u`,
where `B(X,Y; Z)` is the set of bounded bilinear maps into a normed space `Z`.
Second, there is the injective norm, or "smallest reasonable crossnorm":
(S) `‖u‖_∨` = norm of the bilinear map that sends `f : X', g : Y'` to `(f⊗g) u`.
# Mathlib
The formalization treats tensor products of seminormed spaces over normed fields. In this context, `projectiveSeminorm` implements (L1). But `injectiveSeminorm u` doesn't implement (S), but the following variant of (L2):
(L2') `sup_Z { norm of map sending b : B(X,Y; Z) to (lift b) u }.`
In fact, `injectiveSeminorm = projectiveSeminorm `. The upper bound is proven in Mathlib. Equality is attained (somewhat tautologically) by choosing `Z` to be `X ⊗ Y` endowed with the projective seminorm.
`projectiveSeminorm` is defined first; `injectiveSeminorm` builds on it. Then the theory of an isometric version of `PiTensorProduct.lift` is based on `injectiveSeminorm`.
# Proposed change
This PR deprecates `injectiveSeminorm` and ports all applications to (L1). This doesn't actually require too much work, leads to the same mathematical theory, and significantly reduces complexity (and potential for confusion!).
There is a [companion PR](https://github.com/leanprover-community/mathlib4/pull/33969) which formalizes the equality of the current definitions and has a WIP / RFC implementation of the injective seminorm as commonly understood.
Deprecations:
- injectiveSeminorm
- injectiveSeminorm_apply
- norm_eval_le_injectiveSeminorm
- injectiveSeminorm_le_projectiveSeminorm
- injectiveSeminorm_tprod_le
- Mathlib.Analysis.Normed.Module.PiTensorProduct.InjectiveSeminorm
---
Co-authored-by: Davood H. H. Tehrani
[](https://gitpod.io/from-referrer/)
|
new-contributor |
169/207 |
Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean |
3 |
7 |
['Ruben-VandeVelde', 'dupuisf', 'github-actions', 'goliath-klein'] |
dupuisf assignee:dupuisf |
8-54054 8 days ago |
8-56186 8 days ago |
12-39989 12 days |
| 34304 |
AlexBrodbelt author:AlexBrodbelt |
feat(Algebra/Group/Subgroup/Pointwise): Add conj_smul_eq_of_mem, Move conj_smul_le_of_le and conj_smul_subgroupOf |
Moved `conj_smul_le_of_le` and `conj_smul_subgroupOf` since they are lemmas regarding subgroups, and also because the added lemma `conj_smul_eq_of_mem` which uses `conj_smul_le_of_le` also depends on `subset_pointwise_smul_iff` which is in this Group section.
---
I think this is an instance of some missing API which I personally found this useful in my project where I heavily use conjugation.
[](https://gitpod.io/from-referrer/)
|
t-algebra
new-contributor
label:t-algebra$ |
20/13 |
Mathlib/Algebra/Group/Subgroup/Pointwise.lean |
1 |
3 |
['AlexBrodbelt', 'github-actions', 'riccardobrasca'] |
riccardobrasca assignee:riccardobrasca |
8-805 8 days ago |
7-84631 7 days ago |
11-82762 11 days |
| 32692 |
WilliamCoram author:WilliamCoram |
feat: define multivariate restricted power series |
We define multivariate restricted power series over a normed ring R, and show the properties that they form a ring when R has the ultrametric property.
This work generalises my previous work in #26089 which will need to be refactored.
---
[](https://gitpod.io/from-referrer/)
|
t-ring-theory
t-number-theory
new-contributor
awaiting-author
large-import
|
212/0 |
Mathlib.lean,Mathlib/Order/Filter/Cofinite.lean,Mathlib/RingTheory/MvPowerSeries/Restricted.lean |
3 |
33 |
['WilliamCoram', 'erdOne', 'github-actions', 'jcommelin'] |
nobody |
7-73656 7 days ago |
11-74898 11 days ago |
9-27052 9 days |
| 29953 |
slashbade author:slashbade |
feat: add reap for experiment |
---
[](https://gitpod.io/from-referrer/)
|
new-contributor |
40/3 |
Cache/IO.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,lake-manifest.json,lakefile.lean |
5 |
3 |
['github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
7-64641 7 days ago |
unknown |
unknown |
| 32583 |
MJ141592 author:MJ141592 |
refactor(SimpleGraph): change bridges not to require the edge to be present |
Remove the requirement for edges to exist in definition of isBridge, and then change the related lemmas to adjust for this, by renaming, fixing the statements and fixing the proofs, including in Acyclic.
Closes #31690. |
t-combinatorics
new-contributor
awaiting-author
|
60/47 |
Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean |
2 |
15 |
['MJ141592', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot'] |
nobody |
7-49390 7 days ago |
57-61180 57 days ago |
0-14360 3 hours |
| 34380 |
Rogerhu12 author:Rogerhu12 |
feat(GroupTheory/Focal): add focal subgroup theorem |
Define `focalSubgroup` (denoted `H*`) and prove the Focal Subgroup Theorem.
The main result is `inf_commutator_eq_focalSubgroup`, which states that for a Sylow p-subgroup `P` of a finite group `G`, `P ∩ G' = P*`.
This implementation includes:
- The definition of the focal subgroup.
- The transfer homomorphism `G → P/P*`.
- The proof using the transfer map.
Also add [gorenstein1968] to `docs/references.bib`.
---
[](https://gitpod.io/from-referrer/)
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t-group-theory
new-contributor
|
298/0 |
Mathlib.lean,Mathlib/GroupTheory/Focal.lean,docs/1000.yaml,docs/references.bib |
4 |
3 |
['Rogerhu12', 'github-actions', 'wwylele'] |
mattrobball assignee:mattrobball |
7-39438 7 days ago |
10-24158 10 days ago |
10-54185 10 days |
| 33458 |
NoneMore author:NoneMore |
feat(ModelTheory): add lifting for embeddings to languages with constants |
Prepare for a generalized Tarski-Vaught test with a set as input instead of a substructure.
---
[](https://gitpod.io/from-referrer/)
|
t-logic
new-contributor
|
35/0 |
Mathlib/ModelTheory/ElementaryMaps.lean,Mathlib/ModelTheory/LanguageMap.lean |
2 |
3 |
['Citronhat', 'github-actions'] |
fpvandoorn assignee:fpvandoorn |
7-11497 7 days ago |
7-10636 7 days ago |
33-2647 33 days |