fact: Definition is_upper_set (P : X → hProp) : hProp := (∀ (x y : X), P x ⇒ x ⊑ y ⇒ P y)%logic.
imports: UniMath.MoreFoundations.All UniMath.OrderTheory.DCPOs.Core.DirectedSets UniMath.OrderTheory.DCPOs.Core.Basics UniMath.OrderTheory.DCPOs.Core.WayBelow UniMath.OrderTheory.DCPOs.Basis.Continuous