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context_free_language_complement (288B)

      1 # Context free language complement
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      3 A [formal_language] which is the [language_complementation] of a [CFL]
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      5 [Emptiness_testing] is [undecidable] because the [universality_problem] is [undecidable] for [CFLs]
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      7 Up: [language_complementation], [CFL]
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      9 Aliases: CFG complement, CFL complement