A note on depth-first derivations (Q1065553)
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scientific article; zbMATH DE number 3924156
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | A note on depth-first derivations |
scientific article; zbMATH DE number 3924156 |
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A note on depth-first derivations (English)
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1985
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It is known that the Szilard language of a context-free grammar is not necessarily context-free, while the left Szilard language is always a simple deterministic language. Depth-first derivations can be regarded as a natural extension of leftmost derivations. In this note, it is shown that the depth-first Szilard languages are simple deterministic ones. In addition, breadth-first Szilard languages are also studied. The author gives an example of a context-free grammar with the property that the associated depth-first Szilard language is not context-free.
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depth-first derivation
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breadth-first derivation
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Szilard language
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context-free grammar
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simple deterministic language
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