ON ALTERNATING PHRASE-STRUCTURE GRAMMARS

被引:0
|
作者
Moriya, Etsuro [1 ,2 ,3 ]
Otto, Friedrich [3 ]
机构
[1] Waseda Univ, Sch Educ, Dept Math, Shinjuku Ku, Tokyo 1698050, Japan
[2] Waseda Univ, Adv Res Inst Sci & Engn, Shinjuku Ku, Tokyo 1698050, Japan
[3] Univ Kassel, Fachbereich Elektrotech Informat, D-34109 Kassel, Germany
关键词
CONTEXT-FREE GRAMMARS; PUSHDOWN-AUTOMATA; LANGUAGES;
D O I
10.1142/S0129054110007106
中图分类号
TP301 [理论、方法];
学科分类号
081202 ;
摘要
The concepts of alternation and of state alternation are extended from context-free grammars to context-sensitive and arbitrary phrase-structure grammars. For the resulting classes of alternating grammars the expressive power is investigated with respect to the leftmost derivation mode and with respect to the unrestricted derivation mode. In particular new grammatical characterizations for the class of languages that are accepted by alternating pushdown automata are obtained in this way.
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页码:1 / 25
页数:25
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