proposition: Fact map_poly_is_additive : additive (map_poly f).
proof: Proof. by move=> p q; apply/polyP=> i; rewrite !(coef_map, coefB) raddfB. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)