proposition: Lemma row0 m n i0 : row i0 (0 : 'M_(m, n)) = 0.
proof: Proof. exact: row_const. 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)