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@article{824275, author = {CsuhajandVarjú, Erzsébet and Masopust, Tomáš and Vaszil, György}, article_number = {2}, keywords = {Cooperating distributed grammar system; permitting grammars; left-permitting grammars; generative power.}, language = {eng}, issn = {1453-8245}, journal = {Romanian Journal of Information Science and Technology}, title = {Cooperating Distributed Grammar Systems with Permitting Grammars as Components}, url = {http://www.imt.ro/romjist/}, volume = {12}, year = {2009} }
TY - JOUR ID - 824275 AU - Csuhaj-Varjú, Erzsébet - Masopust, Tomáš - Vaszil, György PY - 2009 TI - Cooperating Distributed Grammar Systems with Permitting Grammars as Components JF - Romanian Journal of Information Science and Technology VL - 12 IS - 2 SP - 175-189 EP - 175-189 PB - Romanian Academy SN - 14538245 KW - Cooperating distributed grammar system KW - permitting grammars KW - left-permitting grammars KW - generative power. UR - http://www.imt.ro/romjist/ N2 - This paper studies cooperating distributed grammar systems working in the terminal derivation mode where the components are variants of permitting grammars. It proves that although the family of permitting languages is strictly included in the family of random context languages, the families of random context languages and languages generated by permitting cooperating distributed grammar systems in the above mentioned derivation mode coincide. Moreover, if the components are so-called left-permitting grammars, then cooperating distributed grammar systems in the terminal mode characterize the class of context-sensitive languages, or if erasing rules are allowed, the class of recursively enumerable languages. Descriptional complexity results are also presented. It is shown that the number of permitting components can be bounded, in the case of left-permitting components with erasing rules even together with the number of nonterminals. ER -
CSUHAJ-VARJÚ, Erzsébet, Tomáš MASOPUST a György VASZIL. Cooperating Distributed Grammar Systems with Permitting Grammars as Components. \textit{Romanian Journal of Information Science and Technology}. Romanian Academy, 2009, roč.~12, č.~2, s.~175-189. ISSN~1453-8245.
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