proposition: Lemma mulGsubP K H G : reflect (K \subset G /\ H \subset G) (K * H \subset G).
proof: Proof. by rewrite mulG_subG; apply: andP. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype div path tuple bigop prime finset)