proposition: Lemma horner_morphC a : horner_morph cfu a%:P = f a.
proof: Proof. by rewrite /horner_morph map_polyC hornerC. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)