proposition: Lemma scalar_mx_is_multiplicative : multiplicative (@scalar_mx R n).
proof: Proof. by split=> //; apply: scalar_mxM. 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)