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DOI: 10.4230/LIPIcs.TYPES.2014.288
URN: urn:nbn:de:0030-drops-55026
URL: https://drops.dagstuhl.de/opus/volltexte/2015/5502/
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Steila, Silvia

An Intuitionistic Analysis of Size-change Termination

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Abstract

In 2001 Lee, Jones and Ben-Amram introduced the notion of size-change termination (SCT) for first order functional programs, a sufficient condition for termination. They proved that a program is size-change terminating if and only if it has a certain property which can be statically verified from the recursive definition of the program. Their proof of the size-change termination theorem used Ramsey's Theorem for pairs, which is a purely classical result. In 2012 Vytiniotis, Coquand and Wahlsteldt intuitionistically proved a classical variant of the size-change termination theorem by using the Almost-Full Theorem instead of Ramsey's Theorem for pairs. In this paper we provide an intuitionistic proof of another classical variant of the SCT theorem: our goal is to provide a statement and a proof very similar to the original ones. This can be done by using the H-closure Theorem, which differs from Ramsey's Theorem for pairs only by a contrapositive step. As a side result we obtain another proof of the characterization of the functions computed by a tail-recursive SCT program, by relating the SCT Theorem with the Termination Theorem by Podelski and Rybalchenko. Finally, by investigating the relationship between them, we provide a property in the "language" of size-change termination which is equivalent to Podelski and Rybalchenko's termination.

BibTeX - Entry

@InProceedings{steila:LIPIcs:2015:5502,
  author =	{Silvia Steila},
  title =	{{An Intuitionistic Analysis of Size-change Termination}},
  booktitle =	{20th International Conference on Types for Proofs and Programs (TYPES 2014)},
  pages =	{288--307},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-88-0},
  ISSN =	{1868-8969},
  year =	{2015},
  volume =	{39},
  editor =	{Hugo Herbelin and Pierre Letouzey and Matthieu Sozeau},
  publisher =	{Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{http://drops.dagstuhl.de/opus/volltexte/2015/5502},
  URN =		{urn:nbn:de:0030-drops-55026},
  doi =		{10.4230/LIPIcs.TYPES.2014.288},
  annote =	{Keywords: Intuitionism, Ramsey's Theorem, Termination}
}

Keywords: Intuitionism, Ramsey's Theorem, Termination
Seminar: 20th International Conference on Types for Proofs and Programs (TYPES 2014)
Issue Date: 2015
Date of publication: 29.09.2015


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