proposition: Lemma injm_maximal_eq : maximal_eq (f @* M) (f @* G) = maximal_eq M G.
proof: Proof. by rewrite /maximal_eq injm_maximal // injm_eq. Qed.
imports: mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq path) mathcomp(fintype bigop finset fingroup morphism) mathcomp(automorphism quotient action commutator center)