SnirBroshi

SnirBroshi/mathlib4

The math library of Lean 4

1 stars 0 forks 1 watchers Apache License 2.0
View on GitHub Website
92 Open Issues Need Help Last updated: Jun 27, 2026

Open Issues Need Help

View All on GitHub
[`SimpleGraph`] Graham-Pollak theorem 4 days ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

Linter for naming capitalization & underscores 7 days ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Bridgeless vs 2-connectivity, and common graphs 8 days ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Logic/Relation`] add missing theorems and instances 10 days ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

Define `Cardinal.choose` and `ENat.choose` 11 days ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[`GroupTheory`] CA and CN groups 11 days ago
help wanted group-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Walk/Operations`] `take` and `drop` 11 days ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

Integral representation of the Zeta function 13 days ago
help wanted analysis
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Analysis/Arctan`] `StrictMono (x - Real.arctan x)` 14 days ago
help wanted analysis
SnirBroshi/mathlib4
1

The math library of Lean 4

Circumference of a circle 14 days ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

Properties of `Matrix.rank` / `Matrix.cRank` 15 days ago
help wanted algebra
SnirBroshi/mathlib4
1

The math library of Lean 4

Use `Function.IsConst` everywhere 16 days ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Mycielskian 16 days ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Properties and operations 16 days ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Clique`] Expand independent sets API 19 days ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] `completeBipartiteGraph` morphisms 20 days ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Bipartite`] Generalize `bipartiteDoubleCover` 20 days ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Perfect graphs 21 days ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Digraph/Orientation`] Gallai-Hasse-Roy-Vitaver theorem 22 days ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/LineGraph`] Forbidden subgraphs characterization 23 days ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Cayley`] Frucht's theorem 23 days ago
help wanted graph-theory algebra
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Order`] Jordan-Dedekind chain condition 23 days ago
help wanted order
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Order`] An infinite complete boolean algebra is uncountable 24 days ago
help wanted order
SnirBroshi/mathlib4
1

The math library of Lean 4

[`GroupTheory`] Locally cyclic/nilpotent/finite groups 24 days ago
help wanted group-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

Rename `diag` to `diagonal` everywhere 24 days ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[`NumberTheory/SumThreeSquares`] Legendre's three-square theorem 25 days ago
help wanted number-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`LinearAlgebra/Matrix/Hermitian`] Sylvester's criterion 25 days ago
help wanted algebra
SnirBroshi/mathlib4
1

The math library of Lean 4

Renames: `id`/`comp` vs `refl`/`trans` 25 days ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[`LinearAlgebra/Matrix/ToLin`] Rename `Matrix.toLin` to `Matrix.toLinearMap` 25 days ago
help wanted algebra
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Algebra/Polynomial/Roots`] `Polynomial.[a]root[Fin]set` 25 days ago
help wanted algebra
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Algebra` & `Order`] Properties of subobject lattices 26 days ago
help wanted algebra order
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Algebra` & `Order`] Missing `CompleteLattice` instances 26 days ago
help wanted algebra order
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Order/Zorn`] Strengthen Zorn's lemma in preorders about 1 month ago
help wanted order
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Circulant`] `(cycleGraph <| 2 * k + 3)ᶜ.cliqueNum = k` about 1 month ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Topology`] Continuous iff forall sets about 1 month ago
help wanted topology
SnirBroshi/mathlib4
1

The math library of Lean 4

Relate list predicates with their counterparts about 2 months ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Order`] Mac Lane's condition for upper-modular lattices about 2 months ago
help wanted order
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Order`] Cool lattice results about 2 months ago
help wanted order
SnirBroshi/mathlib4
1

The math library of Lean 4

`Real.exp` sequence bounds about 2 months ago
help wanted analysis
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Algebra` & `Order`] Properties of the divisor lattice about 2 months ago
help wanted algebra order
SnirBroshi/mathlib4
1

The math library of Lean 4

Jacobian and Hessian matrix about 2 months ago
help wanted analysis
SnirBroshi/mathlib4
1

The math library of Lean 4

[`GroupTheory` & `Order`] Ore's theorem 2 months ago
help wanted group-theory order
SnirBroshi/mathlib4
1

The math library of Lean 4

[`GroupTheory` & `Order`] Lattice-isomorphic groups 2 months ago
help wanted group-theory order
SnirBroshi/mathlib4
1

The math library of Lean 4

Matrix diagonalization / similarity / Jordan normal form 2 months ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] The Rado graph 2 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Analysis/MeanInequalities`] Fill in API 2 months ago
help wanted analysis
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Petersen's theorem 2 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Define the Petersen graph 2 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Walk`] Properties and operations 2 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Hamiltonian`] Graphs with Hamiltonian/Eulerian walks are connected 2 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Trails`] existence of an Eulerian walk 2 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Eulerian`] Explicit construction of an Eulerian circuit for `completeGraph (Fin (2 * n + 1))` 2 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

Bundle matrix morphisms 3 months ago
help wanted algebra
SnirBroshi/mathlib4
1

The math library of Lean 4

Skew-symmetric / skew-hermitian matrices 3 months ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Combinatorics/Enumerative/Stirling`] relate both kinds of Stirling numbers to counting problems 3 months ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] `Sigma` operation 3 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Prod`] Coloring API for the tensor product 3 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/LapMatrix`] Spectra of known graphs 4 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

Complex analysis 4 months ago
help wanted analysis
SnirBroshi/mathlib4
1

The math library of Lean 4

[`RingTheory/RootsOfUnity`] The sum of all roots of unity is 0 and other trivial stuff 4 months ago
help wanted analysis
SnirBroshi/mathlib4
1

The math library of Lean 4

`Subtype.restrict` / `Set.restrict` / `Finset.restrict` 4 months ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

Summing `ENat` 5 months ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Menger's theorems 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Paths`] Any two longest paths in a preconnected graph intersect 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`RingTheory/Algebraic`] `Transcendental`/`IsAlgebraic` over fraction rings 5 months ago
help wanted algebra
SnirBroshi/mathlib4
1

The math library of Lean 4

[`NumberTheory/Real/Irrational`] `Decidable <| Irrational <| q ^ p` for `q p : ℚ` 6 months ago
help wanted number-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Counterexamples`] Lakes of Wada 6 months ago
help wanted topology
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Analysis/SpecialFunctions/Gamma/Beta`] `Γ(s - 1) = Γ(s + 1)` iff 6 months ago
help wanted analysis
SnirBroshi/mathlib4
1

The math library of Lean 4

[`NumberTheory/Transcendental/Liouville/LiouvilleNumber`] Liouville numbers using digits other than 1 6 months ago
help wanted number-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Paths`] A walk is a path iff its subgraph is acyclic 6 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Connectivity`] Connectivity vs adding edges 6 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Algebra/LinearRecurrence`] Pisano periods 6 months ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Analysis/Normed/Algebra/MatrixExponential`] det / trace / eigenvalues 7 months ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

Van der Waerden and Schur numbers 7 months ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Acyclic`] Add `IsTrail` versions of acyclic theorems 7 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`FieldTheory/Perfect`] Prove equivalences 7 months ago
help wanted algebra
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Prod`] Define the tensor product 7 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Hadwiger-Nelson problem 7 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Dominating sets and domination number 7 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/ConcreteColorings`] `(cycleGraph <| 2 * k + 1)ᶜ.chromaticNumber = k + 1` 7 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Paths and incidence sets / degrees 7 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`NumberTheory/Complex`] `re`/`im`/`star` are algebraic 7 months ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

Hermite's identity 7 months ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Longest paths in acyclic graphs are between leaves 7 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Existence of paths of length `edist` / `eccent` / `ediam` / `radius` 7 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Longest path iff length equals diameter / eccentricity 7 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Shortest walks are paths 7 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Calculating the diameter 7 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Connectivity/Connected`] Change `connected_delete_edge_of_not_isBridge` to only require `Preconnected` 7 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Connectivity/WalkDecomp`] `reverse` / `takeUntil` / `dropUntil` 7 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

Deprecate `Order.Preimage` and `InvImage` in favor of `Function.onFun` 7 months ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[Topology] Rename `ZerothHomotopy` to `PathConnectedComponent` 7 months ago
help wanted topology
SnirBroshi/mathlib4
1

The math library of Lean 4