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definability_problem (260B)

      1 # Definability problem
      2 
      3 For a [query_class] C, given a [database] D and set of [query_answers] a, decide if there is a [query] Q in C such that Q(D) = a
      4 
      5 See also: [synthetic_witness], [Logical_separability]
      6 
      7 Up: [database_theory]
      8 
      9 Aliases: query definability