Infinitary Rewriting Coinductively

Authors Jörg Endrullis, Andrew Polonsky



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Jörg Endrullis
Andrew Polonsky

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Jörg Endrullis and Andrew Polonsky. Infinitary Rewriting Coinductively. In 18th International Workshop on Types for Proofs and Programs (TYPES 2011). Leibniz International Proceedings in Informatics (LIPIcs), Volume 19, pp. 16-27, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2013)
https://doi.org/10.4230/LIPIcs.TYPES.2011.16

Abstract

We provide a coinductive definition of strongly convergent reductions between infinite lambda terms. This approach avoids the notions of ordinals and metric convergence which have appeared in the earlier definitions of the concept. As an illustration, we prove the existence part of the infinitary standardization theorem. The proof is fully formalized in Coq using coinductive types. The paper concludes with a characterization of infinite lambda terms which reduce to themselves in a single beta step.
Keywords
  • infinitary rewriting
  • coinduction
  • lambda calculus
  • standardization

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