proposition: Fact comp_poly_is_linear p : linear (comp_poly p).
proof: Proof. move=> a q r. by rewrite /comp_poly rmorphD /= map_polyZ !hornerE_comm mul_polyC. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)