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Circumference of a circle

help wantedExtra attention is neededExtra attention is needed

Status: Open.

#44 In SnirBroshi/mathlib4;

· SnirBroshi opened on Mar 10, 2026

[Analysis/Normed/Algebra/MatrixExponential] det / trace / eigenvalues

help wantedExtra attention is neededExtra attention is needed

Status: Open.

#43 In SnirBroshi/mathlib4;

· SnirBroshi opened on Mar 10, 2026

Skew-symmetric / skew-hermitian matrices

help wantedExtra attention is neededExtra attention is needed

Status: Open.

#42 In SnirBroshi/mathlib4;

· SnirBroshi opened on Mar 10, 2026

[SimpleGraph] Kirchhoff's matrix tree theorem

graph-theory

Status: Open.

#41 In SnirBroshi/mathlib4;

· SnirBroshi opened on Mar 7, 2026

Van der Waerden and Schur numbers

help wantedExtra attention is neededExtra attention is needed

Status: Open.

#40 In SnirBroshi/mathlib4;

· SnirBroshi opened on Mar 7, 2026

[SimpleGraph/Acyclic] Add IsTrail versions of acyclic theorems

graph-theory

help wantedExtra attention is neededExtra attention is needed

Status: Open.

#39 In SnirBroshi/mathlib4;

· SnirBroshi opened on Mar 7, 2026

[RingTheory/Algebraic] Transcendental/IsAlgebraic over fraction rings

algebra

help wantedExtra attention is neededExtra attention is needed

Status: Open.

#38 In SnirBroshi/mathlib4;

· SnirBroshi opened on Mar 7, 2026

[FieldTheory/Perfect] Prove equivalences

algebra

help wantedExtra attention is neededExtra attention is needed

Status: Open.

#37 In SnirBroshi/mathlib4;

· SnirBroshi opened on Mar 7, 2026

[SimpleGraph] Hadwiger-Nelson problem

graph-theory

help wantedExtra attention is neededExtra attention is needed

Status: Open.

#36 In SnirBroshi/mathlib4;

· SnirBroshi opened on Mar 7, 2026

[SimpleGraph/Prod] Coloring API for the tensor product

graph-theory

help wantedExtra attention is neededExtra attention is needed

Status: Open.

#35 In SnirBroshi/mathlib4;

· SnirBroshi opened on Mar 7, 2026

[SimpleGraph/Prod] Define the tensor product

graph-theory

help wantedExtra attention is neededExtra attention is needed

Status: Open.

#34 In SnirBroshi/mathlib4;

· SnirBroshi opened on Mar 7, 2026

Kőnig's infinity lemma

graph-theory

Status: Open.

#33 In SnirBroshi/mathlib4;

· SnirBroshi opened on Mar 3, 2026