proposition: Lemma mmap_is_multiplicative : multiplicative (mmap f h).
proof: Proof. apply/commr_mmap_is_multiplicative. + by move=> i x; apply/mulrC. + by move=> p m m'; apply/mulrC. 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