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universality_context_free_grammar (299B)

      1 # Universality context free grammar
      2 
      3 [universality_problem] for [CFGs]: it is [undecidable]
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      5 - for [uCFGs]: [universality_context_free_grammar_unambiguous]
      6 
      7 Up: [universality_problem]
      8 
      9 See also: [universality_automata]
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     11 Aliases: CFG universality, context free grammar universality, universality CFG