Abstract
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.
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ter Beek, M.H., Csuhaj-Varjú, E., Holzer, M., Vaszil, G. (2011). Cooperating Distributed Grammar Systems: Components with Nonincreasing Competence. In: Kelemen, J., Kelemenová, A. (eds) Computation, Cooperation, and Life. Lecture Notes in Computer Science, vol 6610. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-20000-7_7
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DOI: https://doi.org/10.1007/978-3-642-20000-7_7
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