proposition: Lemma conjRg x y z : [~ x, y] ^ z = [~ x ^ z, y ^ z].
proof: Proof. by rewrite !conjMg !conjVg. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype div path tuple bigop prime finset)