proposition: Lemma mcoeff0 k : 0@_k = 0 :> G .
proof: Proof. exact: raddf0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap