proposition: Lemma subv_anti : antisymmetric subV.
proof: Proof. by move=> U V; apply/vs2mxP. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)