proposition: Lemma polyOver_deriv (ringS : semiringClosed R) : {in polyOver ringS, forall p, p^`() \is a polyOver ringS}.
proof: Proof. by move=> p /polyOverP Kp; apply/polyOverP=> i; rewrite coef_deriv rpredMn ?Kp. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)