proposition: Lemma comp_polyZ c p q : (c *: p) \Po q = c *: (p \Po q).
proof: Proof. exact: linearZZ. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)