proposition: Lemma mcoeffC0 (k : K) : 0%:MP@_k = 0 :> G.
proof: Proof. by rewrite mcoeffC mul0rn. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap