proposition: Lemma any_mmax : {M : {group gT} | M \in 'M}.
proof: Proof. by have [M] := mmax_exists mFT_gt1; case/setIdP; exists M. Qed.
imports: HB(structures) mathcomp.ssreflect.ssreflect mathcomp(ssrbool ssrfun eqtype ssrnat seq div choice fintype bigop) mathcomp(finset prime fingroup morphism automorphism action quotient) mathcomp(gfunctor cyclic pgroup center commutator gseries nilpotent) mathcomp(sylow abelian maximal hall) odd_order(BGsection1 BGsection6)