SnirBroshi

SnirBroshi/mathlib4

The math library of Lean 4

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73 Open Issues Need Help Last updated: Jun 27, 2026

Open Issues Need Help

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[`GroupTheory`] Locally cyclic groups about 4 hours ago
help wanted group-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`Algebra` and `Order`] Properties of subobject lattices 1 day ago
help wanted algebra order
SnirBroshi/mathlib4
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The math library of Lean 4

Relate list predicates with their counterparts 3 days ago
help wanted
SnirBroshi/mathlib4
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The math library of Lean 4

[`Order`] Mac Lane's condition for upper-modular lattices 8 days ago
help wanted order
SnirBroshi/mathlib4
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The math library of Lean 4

[`Order`] An infinite complete boolean algebra is uncountable 8 days ago
help wanted order
SnirBroshi/mathlib4
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The math library of Lean 4

[`Order`] Cool lattice results 8 days ago
help wanted order
SnirBroshi/mathlib4
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The math library of Lean 4

[`Algebra` and `Order`] Missing `CompleteLattice` instances 11 days ago
help wanted algebra order
SnirBroshi/mathlib4
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The math library of Lean 4

`Real.exp` sequence bounds 11 days ago
help wanted analysis
SnirBroshi/mathlib4
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The math library of Lean 4

[`Algebra` & `Order`] Properties of the divisor lattice 12 days ago
help wanted algebra order
SnirBroshi/mathlib4
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The math library of Lean 4

Jacobian and Hessian matrix 12 days ago
help wanted analysis
SnirBroshi/mathlib4
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The math library of Lean 4

[`GroupTheory` & `Order`] Ore's theorem 14 days ago
help wanted group-theory order
SnirBroshi/mathlib4
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The math library of Lean 4

[`GroupTheory` & `Order`] Lattice-isomorphic groups 14 days ago
help wanted group-theory order
SnirBroshi/mathlib4
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The math library of Lean 4

Matrix diagonalization / similarity / Jordan normal form 16 days ago
help wanted
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph`] The Rado graph 18 days ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`Analysis/MeanInequalities`] Fill in API 19 days ago
help wanted analysis
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph`] Properties and operations 20 days ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph`] Petersen's theorem 21 days ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph`] Define the Petersen graph 21 days ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph/Walk`] Properties and operations 23 days ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph/Hamiltonian`] Graphs with Hamiltonian/Eulerian walks are connected 26 days ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph/Trails`] existence of an Eulerian walk 26 days ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph/Eulerian`] Explicit construction of an Eulerian circuit for `completeGraph (Fin (2 * n + 1))` 26 days ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`Logic/Relation`] add missing theorems and instances 27 days ago
help wanted
SnirBroshi/mathlib4
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The math library of Lean 4

Bundle matrix morphisms about 1 month ago
help wanted algebra
SnirBroshi/mathlib4
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The math library of Lean 4

Skew-symmetric / skew-hermitian matrices about 1 month ago
help wanted
SnirBroshi/mathlib4
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The math library of Lean 4

[`Combinatorics/Enumerative/Stirling`] relate both kinds of Stirling numbers to counting problems about 1 month ago
help wanted
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph`] `Sigma` operation about 1 month ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

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

The math library of Lean 4

[`SimpleGraph/LapMatrix`] Spectra of known graphs 2 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

Complex analysis 2 months ago
help wanted analysis
SnirBroshi/mathlib4
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The math library of Lean 4

[`RingTheory/RootsOfUnity`] The sum of all roots of unity is 0 and other trivial stuff 3 months ago
help wanted analysis
SnirBroshi/mathlib4
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The math library of Lean 4

`Subtype.restrict` / `Set.restrict` / `Finset.restrict` 3 months ago
help wanted
SnirBroshi/mathlib4
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The math library of Lean 4

Properties of `Matrix.rank` / `Matrix.cRank` 3 months ago
help wanted algebra
SnirBroshi/mathlib4
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The math library of Lean 4

Summing `ENat` 3 months ago
help wanted
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph`] Menger's theorems 3 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph/Paths`] Any two longest paths in a preconnected graph intersect 3 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`RingTheory/Algebraic`] `Transcendental`/`IsAlgebraic` over fraction rings 4 months ago
help wanted algebra
SnirBroshi/mathlib4
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The math library of Lean 4

Integral representation of the Zeta function 4 months ago
help wanted analysis
SnirBroshi/mathlib4
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The math library of Lean 4

[`NumberTheory/Real/Irrational`] `Decidable <| Irrational <| q ^ p` for `q p : ℚ` 4 months ago
help wanted number-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`Counterexamples`] Lakes of Wada 5 months ago
help wanted topology
SnirBroshi/mathlib4
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The math library of Lean 4

[`Analysis/SpecialFunctions/Gamma/Beta`] `Γ(s - 1) = Γ(s + 1)` iff 5 months ago
help wanted analysis
SnirBroshi/mathlib4
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The math library of Lean 4

[`NumberTheory/Transcendental/Liouville/LiouvilleNumber`] Liouville numbers using digits other than 1 5 months ago
help wanted number-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph/Paths`] A walk is a path iff its subgraph is acyclic 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph/Connectivity`] Connectivity vs adding edges 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`NumberTheory/SumThreeSquares`] Legendre's three-square theorem 5 months ago
help wanted number-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`Algebra/LinearRecurrence`] Pisano periods 5 months ago
help wanted
SnirBroshi/mathlib4
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The math library of Lean 4

Circumference of a circle 5 months ago
help wanted
SnirBroshi/mathlib4
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The math library of Lean 4

[`Analysis/Normed/Algebra/MatrixExponential`] det / trace / eigenvalues 5 months ago
help wanted
SnirBroshi/mathlib4
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The math library of Lean 4

Van der Waerden and Schur numbers 5 months ago
help wanted
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph/Acyclic`] Add `IsTrail` versions of acyclic theorems 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`FieldTheory/Perfect`] Prove equivalences 5 months ago
help wanted algebra
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph/Prod`] Define the tensor product 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph`] Hadwiger-Nelson problem 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph`] Mycielskian 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph`] Dominating sets and domination number 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph`] Perfect graphs 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph/Circulant`] `(cycleGraph <| 2 * k + 1)ᶜ.cliqueNum = k` 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph/ConcreteColorings`] `(cycleGraph <| 2 * k + 1)ᶜ.chromaticNumber = k + 1` 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph`] Paths and incidence sets / degrees 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`NumberTheory/Complex`] `re`/`im`/`star` are algebraic 5 months ago
help wanted
SnirBroshi/mathlib4
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The math library of Lean 4

Hermite's identity 5 months ago
help wanted
SnirBroshi/mathlib4
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The math library of Lean 4

[`Analysis/Arctan`] `StrictMono (x - Real.arctan x)` 5 months ago
help wanted analysis
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph`] Longest paths in acyclic graphs are between leaves 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Walks/Operations`] `take` and `drop` 5 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` 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph`] Longest path iff length equals diameter / eccentricity 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Shortest walks are paths 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph`] Calculating the diameter 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph/Connectivity/Connected`] Change `connected_delete_edge_of_not_isBridge` to only require `Preconnected` 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
1

The math library of Lean 4

[`SimpleGraph/Clique`] Expand independent sets API 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

[`SimpleGraph/Connectivity/WalkDecomp`] `reverse` / `takeUntil` / `dropUntil` 5 months ago
help wanted graph-theory
SnirBroshi/mathlib4
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The math library of Lean 4

Deprecate `Order.Preimage` and `InvImage` in favor of `Function.onFun` 5 months ago
help wanted
SnirBroshi/mathlib4
1

The math library of Lean 4

[Topology] Rename `ZerothHomotopy` to `PathConnectedComponent` 5 months ago
help wanted topology
SnirBroshi/mathlib4
1

The math library of Lean 4