proposition: Lemma comp_polyCr p c : p \Po c%:P = p.[c]%:P.
proof: Proof. exact: horner_map. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)