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