fact: Definition chain_union_rel_eqn {X : hSet} {I : UU} {S : I → WOSubset X} (chain : is_wosubset_chain S) (x y : carrier_subset (⋃ (λ i, S i))) i (s : S i (pr1 x)) (t : S i (pr1 y)) : chain_union_rel chain x y = WOSrel (S i) (pr1 x,,s) (pr1 y,,t).
imports: UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.Propositions UniMath.MoreFoundations.Subtypes UniMath.MoreFoundations.Sets UniMath.MoreFoundations.AxiomOfChoice UniMath.Combinatorics.OrderedSets