proposition: Lemma hornerM p q x : (p * q).[x] = p.[x] * q.[x].
proof: Proof. by rewrite hornerM_comm //; apply: mulrC. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)