proposition: Lemma alg_polyC a : a%:A = a%:P :> {poly R}.
proof: Proof. by rewrite -mul_polyC mulr1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)