proposition: Lemma mmap_is_additive : additive (mmap f h).
proof: Proof. move=> p q /=; pose_big_enough i. rewrite !(mmapE i) // -sumrB; apply/eq_bigr. by case=> /= [m _] _; rewrite !raddfB /= mulrDl mulNr. by close. 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