Comments on effective and unambiguous context-free languages
Eduard Kostolanský (1969)
Kybernetika
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Eduard Kostolanský (1969)
Kybernetika
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Miroslav Novotný (1974)
Kybernetika
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Milan Drášil (1989)
Archivum Mathematicum
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Ulrike Brandt, Ghislain Delepine, Hermann K.-G. Walter (2004)
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
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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.