proposition: Lemma comp_poly0r p : p \Po 0 = (p`_0)%:P.
proof: Proof. by rewrite comp_polyCr horner_coef0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)