منابع مشابه
Weightreducing grammars and ultralinear languages
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.
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ژورنال
عنوان ژورنال: Review of Scientific Instruments
سال: 1960
ISSN: 0034-6748,1089-7623
DOI: 10.1063/1.1717123