Abstract
We present two, quite different, logical characterizations of the computational complexity class PSPACE on unordered, finite relational structures. The first of these, the closure of second-order logic under the formation of partial fixed points is well-known in the folklore but does not seem to be in the literature. The second, the closure of first-order logic under taking partial fixed points and under an operator for nondeterministic choice, is novel. We also present syntactic normal forms for the two logics and compare the second with other choice-based fixed-point logics found in the literature.
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Richerby, D. (2004). Logical Characterizations of PSPACE. In: Marcinkowski, J., Tarlecki, A. (eds) Computer Science Logic. CSL 2004. Lecture Notes in Computer Science, vol 3210. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-30124-0_29
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DOI: https://doi.org/10.1007/978-3-540-30124-0_29
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