proposition: Lemma nderivnD n : {morph nderivn n : p q / p + q}.
proof: Proof. exact: linearD. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)