Journal of Symbolic Logic

2-ExpTime lower bounds for propositional dynamic logics with intersection

Martin Lange and Carsten Lutz

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Abstract

In 1984, Danecki proved that satisfiability in IPDL, i.e., Propositional Dynamic Logic (PDL) extended with an intersection operator on programs, is decidable in deterministic double exponential time. Since then, the exact complexity of IPDL has remained an open problem: the best known lower bound was the ExpTime one stemming from plain PDL until, in 2004, the first author established ExpSpace-hardness. In this paper, we finally close the gap and prove that IPDL is hard for 2-ExpTime, thus 2-ExpTime-complete. We then sharpen our lower bound, showing that it even applies to IPDL without the test operator interpreted on tree structures.

Article information

Source
J. Symbolic Logic, Volume 70, Issue 4 (2005), 1072-1086.

Dates
First available in Project Euclid: 18 October 2005

Permanent link to this document
https://projecteuclid.org/euclid.jsl/1129642115

Digital Object Identifier
doi:10.2178/jsl/1129642115

Mathematical Reviews number (MathSciNet)
MR2194237

Zentralblatt MATH identifier
1100.03017

Citation

Lange, Martin; Lutz, Carsten. 2-ExpTime lower bounds for propositional dynamic logics with intersection. J. Symbolic Logic 70 (2005), no. 4, 1072--1086. doi:10.2178/jsl/1129642115. https://projecteuclid.org/euclid.jsl/1129642115


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