proposition: Lemma mul_malgC c g : c%:MP * g = c *: g.
proof: Proof. by rewrite malgM_def malgZ_def fgmulUg; apply/eq_bigr=> /= k _; rewrite mul1m. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap