Two power-decreasing derivation restrictions in generalized scattered context grammars
AbstractThe present paper introduces and discusses generalized scattered context grammars that are based upon sequences of productions whose left-hand sides are formed by nonterminal strings, not just single nonterminals. It places two restrictions on the derivations in these grammars. More specifically, let k be a positive integer. The first restriction requires that all rewritten symbols occur within the first k symbols of the first continuous block of nonterminals in the sentential form during every derivation step. The other restriction defines derivations over sentential forms containing no more than k occurrences of nonterminals. As its main result, the paper demonstrates that both restrictions decrease the generative power of these grammars to the power of context-free grammars.
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How to Cite
Masopust, T., Meduna, A., & Šimácek, J. (2008). Two power-decreasing derivation restrictions in generalized scattered context grammars. Acta Cybernetica, 18(4), 783-793. Retrieved from https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3750