proposition: Lemma conjsgM A x y : A :^ (x * y) = (A :^ x) :^ y.
proof: Proof. by rewrite !conjsgE invMg -!mulg_set1 !mulgA. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype div path tuple bigop prime finset)