fact: Definition Upw (T : Tree) (x : pr11 T) : hSet := (∑ (y : pr11 T), pr121 T x y) ,, (isaset_Upw_underlying T x).
imports: UniMath.Foundations.PartB UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.Foundations.HLevels UniMath.Combinatorics.WellOrderedSets UniMath.Combinatorics.OrderedSets UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.Propositions