proposition: Lemma add0v : left_id 0%VS addV.
proof: Proof. by move=> U; apply/addv_idPr/sub0v. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)