The equivalence of four extensions of context-free grammars

  title={The equivalence of four extensions of context-free grammars},
  author={K. Vijay-Shanker and David J. Weir},
  journal={Mathematical systems theory},
There is currently considerable interest among computational linguists in grammatical formalisms with highly restricted generative power. This paper concerns the relationship between the class of string languages generated by several such formalisms, namely, combinatory categorial grammars, head grammars, linear indexed grammars, and tree adjoining grammars. Each of these formalisms is known to generate a larger class of languages than context-free grammars. The four formalisms under… CONTINUE READING
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