proposition: Lemma dim_vline v : \dim <[v]> = (v != 0).
proof: Proof. by rewrite /dimv mxrank_gen rank_rV (can2_eq v2rK r2vK) linear0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)