proposition: Lemma subvf U : (U <= fullv)%VS.
proof: Proof. by rewrite /subsetv vs2mxF submx1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)