proposition: Lemma mulVpmx m n (A : 'M[F]_(m, n)) : row_full A -> pinvmx A *m A = 1%:M.
proof: Proof. by move=> fA; rewrite -[pinvmx _]mul1mx mulmxKpV// sub1mx. 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)