Abstract
By “initial segments of P” we mean classes DTime(n k). The question of whether for any fixed signature the first-order definable predicates in finite models of this signature are all in an initial segment of P is shown to be related to other intriguing open problems in complexity theory and logic, like P=PSpace.
The second part of the paper strengthens the result of Ph. Kolaitis of logical definability of unambiguous computations.
This work has been partially supported by NSF Grant CCR 9403809.
A part of this research was carried out while the author was visiting UCLA and supported in part by NSF Grant CCR 9403809.
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Stolboushkin, A.P., Taitslin, M.A. (1995). Is first order contained in an initial segment of PTIME?. In: Pacholski, L., Tiuryn, J. (eds) Computer Science Logic. CSL 1994. Lecture Notes in Computer Science, vol 933. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0022260
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DOI: https://doi.org/10.1007/BFb0022260
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