Some decision problems for parallel communicating grammar systems
نویسندگان
چکیده
منابع مشابه
Parallel Communicating Grammar Systems with Negotiation
In a parallel communicating grammar system, several grammars work together , synchronously, on their own sentential forms, and communicate on request. No restriction is imposed usually about the communicated strings. We consider here two types of restrictions, as models of the negotiation process in multi-agent systems: (1) conditions formulated on the transmitted strings, and (2) conditions fo...
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We compare the power of two (fairly di erent) recently investigated language identifying devices: patterns and parallel communicating (PC) grammar systems. The simulation of multi-patterns by context-free PC grammar systems is rather obvious, but, unexpectedly, this can be realized also by (non-centralized) PC grammar systems with right-linear components. Moreover, in nite multi-patterns formin...
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In natural languages, there occur phenomena like multiple agreements, crossed agreements and replication. These aspects are represented by the three languages K1 = {anbncn | n ≥ 1}, K2 = {anbmcndm | m, n ≥ 1} and K3 = {ww | w ∈ {a, b}}, respectively. These languages are of interest, when modeling natural languages. In the present paper, we give parallel communicating grammar systems (PC grammar...
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Two contradictory results state that the synchronized parallel communicating grammar systems with context-free components (CF-PCGS) are either Turing complete or less expressive than contextsensitive grammars. We show that the latter result is incorrect. Indeed, we discover that the proof of this result relies on coverability trees for CF-PCGS, but that such coverability trees do not contain en...
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We associate Szilard and extended Szilard languages to parallel communicating grammar systems, starting from labels associated to productions of the components of the systems. We study families of such languages associated to various classes of parallel communicating grammar systems, comparing them to each other, to families of languages generated by regulated rewriting devices or by parallel c...
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ژورنال
عنوان ژورنال: Theoretical Computer Science
سال: 1994
ISSN: 0304-3975
DOI: 10.1016/0304-3975(94)90243-7