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