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infinite_ucq (299B)

      1 # Infinite UCQ
      2 
      3 An *infinite UCQ* is a [query] which is a generally infinite [disjunction] of [CQs]
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      5 There are precisely the [homomorphism_closed] queries
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      7 [UCQs] are precisely those infinite UCQs where the disjunction can be finite
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      9 Up: [homomorphism_closed], [UCQ]
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     11 Aliases: infinite UCQs, UCQinf