proposition: Lemma mnmD_eq0 m1 m2 : (m1 + m2 == 0)%MM = (m1 == 0%MM) && (m2 == 0%MM).
proof: Proof. by rewrite -!mdeg_eq0 mdegD addn_eq0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(choice fintype tuple finfun bigop finset binomial) mathcomp(order fingroup perm ssralg zmodp poly ssrint) mathcomp(matrix vector) mathcomp(bigenough) ssrcomplements freeg