proposition: Lemma mul_polyC a p : a%:P * p = a *: p.
proof: Proof. by rewrite -scale_polyE. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)