fact: Definition coproduct_dcpo_lub (D : directed_set (coproduct_PartialOrder X Y)) : lub (coproduct_PartialOrder X Y) D.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.OrderTheory.Posets UniMath.OrderTheory.DCPOs.Core.DirectedSets UniMath.OrderTheory.DCPOs.Core.Basics UniMath.OrderTheory.DCPOs.Core.ScottContinuous