We formalize a confluence criterion for the class of quasi-decreasing strongly deterministic conditional term rewrite systems in Isabelle/HOL: confluence follows if all conditional critical pairs are join-able. However, quasi-decreasingness, strong determinism, and joinability of conditional critical pairs are all undecidable in general. Therefore, we also formalize sufficient criteria for those properties, which we incorporate into the general purpose certifier CeTA as well as the confluence checker ConCon for conditional term rewrite systems.
CITATION STYLE
Sternagel, C., & Sternagel, T. (2017). Certifying confluence of quasi-decreasing strongly deterministic conditional term rewrite systems. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 10395 LNAI, pp. 413–431). Springer Verlag. https://doi.org/10.1007/978-3-319-63046-5_26
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