fact: Definition wosub_equal {X:hSet} : hrel (WOSubset X) := λ S T, S ≼ T ∧ T ≼ S.
imports: UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.Propositions UniMath.MoreFoundations.Subtypes UniMath.MoreFoundations.Sets UniMath.MoreFoundations.AxiomOfChoice UniMath.Combinatorics.OrderedSets