proposition: Lemma p_groupJ P x : p_group (P :^ x) = p_group P.
proof: Proof. by rewrite /p_group cardJg pgroupJ. 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)