wiki_research

personal research wiki
git clone https://a3nm.net/git/wiki_research/
Log | Files | Refs

context_free_language_complement (473B)

      1 # Context free language complement
      2 
      3 A [formal_language] which is the [language_complementation] of a [CFL]
      4 
      5 [Emptiness_testing] is [undecidable] because the [universality_problem] is [undecidable] for [CFLs]
      6 
      7 The [language_complement] of a [CFL] or even a [UCFL] may not be a [CFL], cf https://mathoverflow.net/questions/163517/is-there-an-unambiguous-cfl-whose-complement-is-not-context-free
      8 
      9 Up: [language_complementation], [CFL]
     10 
     11 Aliases: CFG complement, CFL complement