mathlib documentation

group_theory.perm.option

Permutations of option α #

@[simp]
theorem equiv.option_congr_one {α : Type u_1} :
@[simp]

Permutations of option α are equivalent to fixing an option α and permuting the remaining with a perm α. The fixed option α is swapped with none.

Equations

The set of all permutations of option α can be constructed by augmenting the set of permutations of α by each element of option α in turn.