Technical Report CS0367

TR#:CS0367
Class:CS
Title: Fairness in Term Rewriting Systems
Authors: S. Porat and N. Francez
PDFCS0367.pdf
Abstract: The notion of fair derivation in a term-rewriting system is introduced, whereby every rewrite rule enabled infinitely often along a derivation is infinitely often applied. A term-rewritinng system is fairly-terminating iff all its fair derivations are finite. The paper presents the following question: is it decidable, for an arbitrary ground term rewriting system, whether it fairly terminates or not? A positive answer is given for several subcases. The general case remains open.
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