proposition: Lemma afix_gen A : 'Fix_to(<<A>>) = 'Fix_to(A).
proof: Proof. by rewrite afix_gen_in ?subsetT. Qed.
imports: mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat div seq) mathcomp(fintype bigop finset fingroup morphism perm) mathcomp(automorphism quotient)