proposition: Lemma mdegD m1 m2 : mdeg (m1 + m2) = (mdeg m1 + mdeg m2)%N.
proof: Proof. by rewrite !mdegE -big_split; apply/eq_bigr => i _; rewrite mnmE. 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