proposition: Lemma capmx1 n (A : 'M_n) : (A :&: 1%:M = A)%MS.
proof: Proof. by rewrite capmxC cap1mx. 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)