proposition: Lemma mx0_is_scalar : is_scalar_mx 0.
proof: Proof. by apply/is_scalar_mxP; exists 0; rewrite raddf0. 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)