proposition: Lemma pgroup1 pi : pi.-group [1 gT].
proof: Proof. by rewrite /pgroup cards1. Qed.
imports: mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq div) mathcomp(fintype bigop finset prime fingroup morphism) mathcomp(gfunctor automorphism quotient action gproduct) mathcomp(cyclic)