LIPIcs.CSL.2016.39.pdf
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Quine's Fluted Fragment is Non-Elementary
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25th EACSL Annual Conference on Computer Science Logic (CSL 2016)
Series: Leibniz International Proceedings in Informatics (LIPIcs)
Conference: Computer Science Logic (CSL) - License:
Creative Commons Attribution 3.0 Unported license
- Publication Date: 2016-08-29
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Ian Pratt-Hartmann, Wieslaw Szwast, and Lidia Tendera. Quine's Fluted Fragment is Non-Elementary. In 25th EACSL Annual Conference on Computer Science Logic (CSL 2016). Leibniz International Proceedings in Informatics (LIPIcs), Volume 62, pp. 39:1-39:21, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)
https://doi.org/10.4230/LIPIcs.CSL.2016.39
https://doi.org/10.4230/LIPIcs.CSL.2016.39
Abstract
We study the fluted fragment, a decidable fragment of first-order logic with an unbounded number of variables, originally identified by W.V. Quine. We show that the satisfiability problem for this fragment has non-elementary complexity, thus refuting an earlier published claim by W.C. Purdy that it is in NExpTime. More precisely, we consider, for all m greater than 1, the intersection of the fluted fragment and the m-variable fragment of first-order logic. We show that this sub-fragment forces (m/2)-tuply exponentially large models, and that its satisfiability problem is (m/2)-NExpTime-hard. We round off by using a corrected version of Purdy's construction to show that the m-variable fluted fragment has the m-tuply exponential model property, and that its satisfiability problem is in m-NExpTime.
Keywords
- Quine
- fluted fragment
- Purdy
- non-elementary
- satisfiability
- decidability
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