proposition: Lemma mcoeffMn k n : {morph mcoeff k: x / x *+ n} .
proof: Proof. exact: raddfMn. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap