proposition: Lemma D_infty_opp : forall f, D_infty f -> D_infty (- f)%F.
proof: Proof. intros f Df n ; apply D_opp ; trivial. Qed.
imports: Rbase Ranalysis Lia Lra Rfunctions Rfunction_facts Rextensionality Rinterval Ranalysis_def Ranalysis_def_simpl Ranalysis_facts Ranalysis_continuity Ranalysis_derivability Ranalysis_monotonicity Rfunction_classes_def MyR_dist Reals.Tactics