proposition: Theorem isaset_ZFS : isaset ZFS.
proof: Proof. apply (isofhleveltotal2 2). - apply isaset_preZFS. - intros x. apply hlevelntosn. apply isaprop_hasuniquerepbranch. Qed.
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