proposition: Lemma size_mul_leq p q : size (p * q) <= (size p + size q).-1.
proof: Proof. by rewrite -[*%R]/mul_poly unlock size_poly. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)