proposition: Lemma asubv A : (A * A <= A)%VS.
proof: Proof. by have /andP[] := valP A. 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)