proposition: Lemma horner0 x : (0 : {poly R}).[x] = 0.
proof: Proof. by rewrite /horner polyseq0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)