proposition: Lemma row_full_castmx m1 m2 n (A : 'M_(m1, n)) e : row_full (castmx e A : 'M_(m2, n)) = row_full A.
proof: Proof. exact/eq_row_full/eqmx_cast. 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 finalg zmodp matrix)