proposition: Lemma derivSn p n : p^`(n.+1) = p^`()^`(n).
proof: Proof. exact: iterSr. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)