proposition: Lemma sub_agenv U : (U <= agenv U)%VS.
proof: Proof. by rewrite 2!agenvEl addvC prodvDr prodv1 -addvA addvSl. 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)