fact: Definition tosub_le (X:hSet) (S T : TOSubset X) : hProp := (∑ le : S ⊆ T, tosub_order_compat le)%prop.
imports: UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.Propositions UniMath.MoreFoundations.Subtypes UniMath.MoreFoundations.Sets UniMath.MoreFoundations.AxiomOfChoice UniMath.Combinatorics.OrderedSets