Abstract
We prove an upper bound result for the first-order theory of a structure W of queues, i.e. words with two relations: addition of a letter on the left and on the right of a word. Using complexity-tailored Ehrenfeucht games we show that the witnesses for quantified variables in this theory can be bound by words of an exponential length. This result, together with a lower bound result for the first-order theory of two successors [6], proves that the first-order theory of W is complete in LATIME(2O(n)): the class of problems solvable by alternating Turing machines runningin exponential time but only with a linear number of alternations.
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Rybina, T., Voronkov, A. (2003). Upper Bounds for a Theory of Queues. In: Baeten, J.C.M., Lenstra, J.K., Parrow, J., Woeginger, G.J. (eds) Automata, Languages and Programming. ICALP 2003. Lecture Notes in Computer Science, vol 2719. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45061-0_56
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DOI: https://doi.org/10.1007/3-540-45061-0_56
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