proposition: Lemma map_Poly s : (Poly s)^f = Poly (map f s).
proof: Proof. exact: map_Poly_id0 (raddf0 f). Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)