proposition: Lemma polyCN : {morph (@polyC R) : c / - c}.
proof: Proof. by move=> c; apply/polyP=> [[|i]]; rewrite coefN !coefC ?oppr0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)