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chomsky-grammars

RAIRO - Theoretical Informatics and Applications (1)

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Weightreducing grammars and ultralinear languages
Ulrike Brandt, Ghislain Delepine, Hermann K.-G. Walter
Journal:

RAIRO - Theoretical Informatics and Applications / Volume 38 / Issue 1 / January 2004

Published online by Cambridge University Press:

15 March 2004, pp. 19-25

Print publication:

January 2004
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We exhibit a new class of grammars with the help of weightfunctions. They are characterized by decreasing the weight during the derivation process. A decision algorithm for the emptiness problem is developed. This class contains non-contextfree grammars. The corresponding language class is identical to the class of ultralinear languages.