proposition: Lemma malgCK : cancel malgC (@mcoeff K G 1%M).
proof: Proof. by move=> c; rewrite mcoeffC eqxx mulr1n. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap