Abstract
This paper introduces Thue specifications, an approach for string-rewriting description of infinite graphs. It is shown that strongly reduction-bounded and unitary reduction-bounded rational Thue specifications have the same expressive power and both characterize the context-free graphs of Muller and Schupp. The problem of strong reduction-boundedness for rational Thue specifications is shown to be undecidable but the class of unitary reduction-bounded rational Thue specifications, that is a proper subclass of strongly reduction-bounded rational Thue specifications, is shown to be recursive.
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Calbrix, H., Knapik, T. (1998). A String-Rewriting Characterization of Muller and Schupp’s Context-Free Graphs. In: Arvind, V., Ramanujam, S. (eds) Foundations of Software Technology and Theoretical Computer Science. FSTTCS 1998. Lecture Notes in Computer Science, vol 1530. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-49382-2_31
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DOI: https://doi.org/10.1007/978-3-540-49382-2_31
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