proposition: Lemma malgC_is_multiplicative : multiplicative (@malgC K R).
proof: Proof. by split=> // g1 g2; apply/malgP=> k; rewrite mcoeffCM !mcoeffC mulrnAr. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap