proposition: Lemma consttJ pi x y : (x ^ y).`_pi = x.`_pi ^ y.
proof: Proof. by rewrite /constt orderJ conjXg. 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)