Polymorphic Higher-Order Termination

Authors Łukasz Czajka , Cynthia Kop



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Author Details

Łukasz Czajka
  • Faculty of Informatics, TU Dortmund, Germany
Cynthia Kop
  • Institute of Computer Science, Radboud University Nijmegen, The Netherlands

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Łukasz Czajka and Cynthia Kop. Polymorphic Higher-Order Termination. In 4th International Conference on Formal Structures for Computation and Deduction (FSCD 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 131, pp. 12:1-12:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019) https://doi.org/10.4230/LIPIcs.FSCD.2019.12

Abstract

We generalise the termination method of higher-order polynomial interpretations to a setting with impredicative polymorphism. Instead of using weakly monotonic functionals, we interpret terms in a suitable extension of System F_omega. This enables a direct interpretation of rewrite rules which make essential use of impredicative polymorphism. In addition, our generalisation eases the applicability of the method in the non-polymorphic setting by allowing for the encoding of inductive data types. As an illustration of the potential of our method, we prove termination of a substantial fragment of full intuitionistic second-order propositional logic with permutative conversions.

Subject Classification

ACM Subject Classification
  • Theory of computation → Rewrite systems
  • Theory of computation → Equational logic and rewriting
  • Theory of computation → Type theory
Keywords
  • termination
  • polymorphism
  • higher-order rewriting
  • permutative conversions

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