proposition: Lemma submDA m1 m2 m3 : (m1 - m2 - m3)%MM = (m1 - (m2 + m3))%MM.
proof: Proof. by apply/mnmP=> i; rewrite !mnmE subnDA. 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