proposition: Lemma scale_scalar_mx n a1 a2 : a1 *: a2%:M = (a1 * a2)%:M :> 'M_n.
proof: Proof. by apply/matrixP=> i j; rewrite !mxE mulrnAr. 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)