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When quoting this document, please refer to the following
DOI: 10.4230/LIPIcs.RTA.2015.57
URN: urn:nbn:de:0030-drops-51895
URL: http://drops.dagstuhl.de/opus/volltexte/2015/5189/
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Baumgartner, Alexander ; Kutsia, Temur ; Levy, Jordi ; Villaret, Mateu

Nominal Anti-Unification

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Abstract

We study nominal anti-unification, which is concerned with computing least general generalizations for given terms-in-context. In general, the problem does not have a least general solution, but if the set of atoms permitted in generalizations is finite, then there exists a least general generalization which is unique modulo variable renaming and alpha-equivalence. We present an algorithm that computes it. The algorithm relies on a subalgorithm that constructively decides equivariance between two terms-in-context. We prove soundness and completeness properties of both algorithms and analyze their complexity. Nominal anti-unification can be applied to problems where generalization of first-order terms is needed (inductive learning, clone detection, etc.), but bindings are involved.

BibTeX - Entry

@InProceedings{baumgartner_et_al:LIPIcs:2015:5189,
  author =	{Alexander Baumgartner and Temur Kutsia and Jordi Levy and Mateu Villaret},
  title =	{{Nominal Anti-Unification}},
  booktitle =	{26th International Conference on Rewriting Techniques and Applications (RTA 2015)},
  pages =	{57--73},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-85-9},
  ISSN =	{1868-8969},
  year =	{2015},
  volume =	{36},
  editor =	{Maribel Fern{\'a}ndez},
  publisher =	{Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{http://drops.dagstuhl.de/opus/volltexte/2015/5189},
  URN =		{urn:nbn:de:0030-drops-51895},
  doi =		{10.4230/LIPIcs.RTA.2015.57},
  annote =	{Keywords: Nominal Anti-Unification, Term-in-context, Equivariance}
}

Keywords: Nominal Anti-Unification, Term-in-context, Equivariance
Seminar: 26th International Conference on Rewriting Techniques and Applications (RTA 2015)
Issue Date: 2015
Date of publication: 17.06.2015


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