proposition: Lemma vec_mx_eq0 m n (v : 'rV_(m * n)) : (vec_mx v == 0) = (v == 0).
proof: Proof. by rewrite (can2_eq vec_mxK mxvecK) raddf0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype finfun bigop finset fingroup perm order) mathcomp(div prime binomial ssralg countalg finalg zmodp)