proposition: Lemma row_full_unit n (A : 'M_n) : row_full A = (A \in unitmx).
proof: Proof. exact: row_free_unit. 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)