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Remarks on the nonexistence of some covering grammars

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Theoretical Computer Science 4th GI Conference

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 67))

Abstract

The problem of covering context-free grammars by grammars in some normal forms is considered. It is shown that certain example grammars cannot be covered by grammars which are in ε-free form or in Greibach normal form or in Chomsky normal form. The results are generalized using a concept called the structural similarity of context-free grammars. Finally, a grammatical transformation method for constructing ε-free covers is given.

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References

  1. Aho, A.V. and J.D. Ullman: The Theory of Parsing, Translation, and Compiling, Vol.I: Parsing. Prentice-Hall, Englewood Cliffs, N.J., 1972.

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Authors
  1. Esko Ukkonen
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K. Weihrauch

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© 1979 Springer-Verlag Berlin Heidelberg

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Ukkonen, E. (1979). Remarks on the nonexistence of some covering grammars. In: Weihrauch, K. (eds) Theoretical Computer Science 4th GI Conference. Lecture Notes in Computer Science, vol 67. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-09118-1_31

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  • DOI: https://doi.org/10.1007/3-540-09118-1_31

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-09118-9

  • Online ISBN: 978-3-540-35517-5

  • eBook Packages: Springer Book Archive

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