Documentation

Mathlib.GroupTheory.GroupAction.CardCommute

A consequence of Burnside's lemma #

See Mathlib.GroupTheory.GroupAction.Quotient for Burnside's lemma itself. This lemma is separate because it requires Nat.card and hence transitively the development of cardinals.

instance instInfiniteProdSubtypeCommute {α : Type u_1} [Mul α] [Infinite α] :
Infinite { p : α × α // Commute p.1 p.2 }