proposition: Lemma mulmxr_is_linear B : linear (mulmxr B).
proof: Proof. by move=> a A1 A2; rewrite /= mulmxDl scalemxAl. 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)