proposition: Lemma ispreorder_Dcuts_le_rel : ispreorder Dcuts_le_rel.
proof: Proof. split. - exact istrans_Dcuts_le_rel. - exact isrefl_Dcuts_le_rel. 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