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