proposition: Lemma memvM A : {in A &, forall u v, u * v \in A}.
proof: Proof. exact/prodvP/asubv. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(choice fintype div tuple finfun bigop ssralg) mathcomp(finalg zmodp matrix vector poly)