proposition: Lemma derivnC c n : c%:P^`(n) = if n == 0 then c%:P else 0.
proof: Proof. by case: n => // n; rewrite derivSn derivC linear0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)