proposition: Lemma mdegB m1 m2 : mdeg (m1 - m2) <= mdeg m1.
proof: Proof. by rewrite !mdegE; apply/leq_sum => i _; rewrite mnmE leq_subr. 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