proposition: Lemma agenvX n U : (agenv U ^+ n.+1)%VS = agenv U.
proof: Proof. exact: expv_id. 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)