proposition: Lemma islapbinop_Dcuts_plus : islapbinop Dcuts_plus.
proof: Proof. intros y x x'. apply sumofmaps ; intros Hlt. - left. now apply Dcuts_plus_lt_l with y. - right. now apply Dcuts_plus_lt_l with y. Qed.
imports: UniMath.MoreFoundations.Orders UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.Notations UniMath.RealNumbers.Sets UniMath.Algebra.ConstructiveStructures UniMath.OrderTheory.Lattice.Lattice UniMath.RealNumbers.Prelim UniMath.RealNumbers.NonnegativeRationals