fact: Definition ispositive_minusNonnegativeReals : ∏ x y : NonnegativeReals, (y < x) <-> (0 < x - y) := ispositive_Dcuts_minus.
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