proposition: Lemma maxpermV : maxperm^-1 = maxperm.
proof: Proof. exact/eqP/permKP/maxpermK. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(fingroup perm morphism presentation) mathcomp(ssralg poly ssrint) permcomp tools permuted combclass congr