proposition: Lemma eq_pgroup pi rho A : pi =i rho -> pi.-group A = rho.-group A.
proof: Proof. exact: eq_pnat. 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)