Cooperating Distributed Grammar Systems: Components with Nonincreasing Competence

  • Maurice H. ter Beek
  • Erzsébet Csuhaj-Varjú
  • Markus Holzer
  • György Vaszil
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6610)


We study the generative power of CD grammar systems (CDGSs) that use a cooperation protocol based on the level of competence on a sentential form — and the competence of their components does not increase during rewriting. A component of a CDGS is k-competent on a sentential form if it can rewrite exactly k different nonterminals appearing in that string. A CDGS with components that are nonincreasing in competence works in =k-competence mode of derivation if no k-competent component can ever become l-competent, for some l > k. We introduce a static and a dynamic definition to impose this restriction, and we relate the generative power of such CDGSs working either in a sequential or in a parallel manner and according to the aforementioned cooperation protocol, for various k, with that of context-free forbidding random context grammars, (random context) ET0L systems, and context-free programmed grammars with appearance checking.


Sentential Form Successful Derivation Dynamic Sense Formal Language Theory Cooperation Protocol 
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© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Maurice H. ter Beek
    • 1
  • Erzsébet Csuhaj-Varjú
    • 2
  • Markus Holzer
    • 3
  • György Vaszil
    • 2
  1. 1.Istituto di Scienza e Tecnologie dell’Informazione ‘A. Faedo’Consiglio Nazionale delle RicerchePisaItaly
  2. 2.Computer and Automation Research InstituteHungarian Academy of SciencesBudapestHungary
  3. 3.Institut für InformatikUniversität GiessenGiessenGermany

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