| Issue |
RAIRO-Theor. Inf. Appl.
Volume 38, Number 1, January-March 2004
|
|
|---|---|---|
| Page(s) | 19 - 25 | |
| DOI | https://doi.org/10.1051/ita:2004001 | |
| Published online | 15 March 2004 | |
Weightreducing grammars and ultralinear languages
University of Technology, Darmstadt Department of Computer Science, Germany; brandt@iti.informatik.tu-darmstadt.de.,
walter@iti.informatik.tu-darmstadt.de., gdelepine@yahoo.fr.
Received:
15
May
2003
Accepted:
7
November
2003
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.
Mathematics Subject Classification: 68Q45
Key words: Chomsky-grammars / weightfunctions / weightreducing grammars / emptiness problem / ultralinear languages.
© EDP Sciences, 2004
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