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greibachs_theorem (356B)

      1 # Greibach's theorem
      2 
      3 https://en.wikipedia.org/wiki/Greibach%27s_theorem
      4 
      5 Can be used to show that deciding whether a [CFG] recognizes a [regular_language], or a [linear_CFL], is [undecidable]
      6 - cf article [greibach1968note]
      7 - cf https://cstheory.stackexchange.com/q/55586
      8 
      9 Up: [context_free_grammar]
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     11 See also: [Rice's_theorem], [bodirdski2024hereditary]