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Certifying the Weighted Path Order (Invited Talk)

Authors René Thiemann , Jonas Schöpf , Christian Sternagel , Akihisa Yamada

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Author Details

René Thiemann
  • University of Innsbruck, Austria
Jonas Schöpf
  • University of Innsbruck, Austria
Christian Sternagel
  • DVT, Innsbruck, Austria
Akihisa Yamada
  • National Institute of Advanced Industrial Science and Technology, Tokyo, Japan

Funding

René Thiemann was supported by the Austrian Science Fund (FWF) project Y757. Jonas Schöpf and Christian Sternagel were supported by FWF project P27502. A part of Akihisa Yamada’s contribution was made while he was working in University of Innsbruck under support by FWF projects Y757 and P27502.

Acknowledgements

We thank Sarah Winkler for her assistance and discussions on IsaFoR, TTT2 and WPO.

Cite As Get BibTex

René Thiemann, Jonas Schöpf, Christian Sternagel, and Akihisa Yamada. Certifying the Weighted Path Order (Invited Talk). In 5th International Conference on Formal Structures for Computation and Deduction (FSCD 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 167, pp. 4:1-4:20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020) https://doi.org/10.4230/LIPIcs.FSCD.2020.4

Abstract

The weighted path order (WPO) unifies and extends several termination proving techniques that are known in term rewriting. Consequently, the first tool implementing WPO could prove termination of rewrite systems for which all previous tools failed. However, we should not blindly trust such results, since there might be problems with the implementation or the paper proof of WPO.
In this work, we increase the reliability of these automatically generated proofs. To this end, we first formally prove the properties of WPO in Isabelle/HOL, and then develop a verified algorithm to certify termination proofs that are generated by tools using WPO. We also include support for max-polynomial interpretations, an important ingredient in WPO. Here we establish a connection to an existing verified SMT solver. Moreover, we extend the termination tools NaTT and TTT2, so that they can now generate certifiable WPO proofs.

Subject Classification

ACM Subject Classification
  • Theory of computation → Logic and verification
  • Theory of computation → Equational logic and rewriting
Keywords
  • certification
  • Isabelle/HOL
  • reduction order
  • termination analysis

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Supplementary Materials

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