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THE FLUTED FRAGMENT REVISITED

Published online by Cambridge University Press:  06 June 2019

IAN PRATT-HARTMANN ,
WIESŁAW SZWAST  and
LIDIA TENDERA
IAN PRATT-HARTMANN
Affiliation:
SCHOOL OF COMPUTER SCIENCE MANCHESTER UNIVERSITY MANCHESTER, M13 9PL, UK and INSTYTUT INFORMATYKI UNIWERSYTET OPOLSKI 45-040 OPOLE, POLAND E-mail: [email protected]
WIESŁAW SZWAST
Affiliation:
INSTYTUT INFORMATYKI UNIWERSYTET OPOLSKI 45-040 OPOLE, POLANDE-mail: [email protected]
LIDIA TENDERA
Affiliation:
INSTYTUT INFORMATYKI UNIWERSYTET OPOLSKI 45-040 OPOLE, POLANDE-mail: [email protected]
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Abstract

We study the fluted fragment, a decidable fragment of first-order logic with an unbounded number of variables, motivated by the work of W. V. Quine. We show that the satisfiability problem for this fragment has nonelementary complexity, thus refuting an earlier published claim by W. C. Purdy that it is in NExpTime. More precisely, we consider ${\cal F}{{\cal L}^m}$, the intersection of the fluted fragment and the m-variable fragment of first-order logic, for all $m \ge 1$. We show that, for $m \ge 2$, this subfragment forces $\left\lfloor {m/2} \right\rfloor$-tuply exponentially large models, and that its satisfiability problem is $\left\lfloor {m/2} \right\rfloor$-NExpTime-hard. We further establish that, for $m \ge 3$, any satisfiable ${\cal F}{{\cal L}^m}$-formula has a model of at most ($m - 2$)-tuply exponential size, whence the satisfiability (= finite satisfiability) problem for this fragment is in ($m - 2$)-NExpTime. Together with other, known, complexity results, this provides tight complexity bounds for ${\cal F}{{\cal L}^m}$ for all $m \le 4$.

Keywords

68Q17first-order logicdecidabilitysatisfiabilitytransitivitycomplexity
Type
Articles
Information
The Journal of Symbolic Logic , Volume 84 , Issue 3 , September 2019 , pp. 1020 - 1048
Copyright
Copyright © The Association for Symbolic Logic 2019 

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