proposition: Lemma addmBA m1 m2 m3 : (m3 <= m2)%MM -> (m1 + (m2 - m3))%MM = (m1 + m2 - m3)%MM.
proof: Proof. by move/mnm_lepP=> h; apply/mnmP=> i; rewrite !mnmE addnBA. 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