proposition: Lemma afix_cycle a : 'Fix_to(<[a]>) = 'Fix_to[a].
proof: Proof. by rewrite afix_cycle_in ?inE. Qed.
imports: mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat div seq) mathcomp(fintype bigop finset fingroup morphism perm) mathcomp(automorphism quotient)