On twist-closed trios: A new morphic characterization of r.e. sets

  • Matthias Jantzen
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1337)


We show that in conjunction with the usual trio operations the combination of twist and product can simulate any combination of intersection, reversal and 1/2. It is proved that any recursively enumerable language L can be homomorphically represented by twisting a linear context-free language. Indeed, the recursively enumerable sets form the least twist-closed full trio generated by dMIR:=wcw rev ¦ w ε a,b *.


Turing Machine Reachability Problem Formal Language Theory Enumerable Language Linear Language 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • Matthias Jantzen
    • 1
  1. 1.Universität Hamburg FB InformatikUniversität HamburgHamburg

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