proposition: Fact drop_poly_is_linear m : linear (drop_poly m).
proof: Proof. by move=> k p q; rewrite drop_polyD drop_polyZ. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)