Certified Subterm Criterion and Certified Usable Rules

Authors Christian Sternagel, René Thiemann

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Christian Sternagel
René Thiemann

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Christian Sternagel and René Thiemann. Certified Subterm Criterion and Certified Usable Rules. In Proceedings of the 21st International Conference on Rewriting Techniques and Applications. Leibniz International Proceedings in Informatics (LIPIcs), Volume 6, pp. 325-340, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)


In this paper we present our formalization of two important termination techniques for term rewrite systems: the subterm criterion and the reduction pair processor in combination with usable rules. For both techniques we developed executable check functions in the theorem prover Isabelle/HOL which can certify the correct application of these techniques in some given termination proof. As there are several variants of usable rules we designed our check function in such a way that it accepts all known variants, even those which are not explicitly spelled out in previous papers. We integrated our formalization in the publicly available IsaFoR-library. This led to a significant increase in the power of CeTA, the corresponding certified termination proof checker that is extracted from IsaFoR.
  • Term Rewriting
  • Certification
  • Termination
  • Theorem Proving


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