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Layer Systems for Proving Confluence

Authors Bertram Felgenhauer, Harald Zankl, Aart Middeldorp



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Bertram Felgenhauer
Harald Zankl
Aart Middeldorp

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Bertram Felgenhauer, Harald Zankl, and Aart Middeldorp. Layer Systems for Proving Confluence. In IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2011). Leibniz International Proceedings in Informatics (LIPIcs), Volume 13, pp. 288-299, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2011)
https://doi.org/10.4230/LIPIcs.FSTTCS.2011.288

Abstract

We introduce layer systems for proving generalizations of the modularity of confluence for first-order rewrite systems. Layer systems specify how terms can be divided into layers. We establish structural conditions on those systems that imply confluence. Our abstract framework covers known results like many-sorted persistence, layer-preservation and currying. We present a counterexample to an extension of the former to order-sorted rewriting and derive new sufficient conditions for the extension to hold.
Keywords
  • Term rewriting
  • Confluence
  • Modularity
  • Persistence

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