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  1. A remark on pseudo proof systems and hard instances of the satisfiability problem.Jan Maly & Moritz Müller - 2018 - Mathematical Logic Quarterly 64 (6):418-428.
    We link two concepts from the literature, namely hard sequences for the satisfiability problem sat and so‐called pseudo proof systems proposed for study by Krajíček. Pseudo proof systems are elements of a particular nonstandard model constructed by forcing with random variables. We show that the existence of mad pseudo proof systems is equivalent to the existence of a randomized polynomial time procedure with a highly restrictive use of randomness which produces satisfiable formulas whose satisfying assignments are probably hard to find.
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  • Polynomial time ultrapowers and the consistency of circuit lower bounds.Jan Bydžovský & Moritz Müller - 2020 - Archive for Mathematical Logic 59 (1-2):127-147.
    A polynomial time ultrapower is a structure given by the set of polynomial time computable functions modulo some ultrafilter. They model the universal theory \ of all polynomial time functions. Generalizing a theorem of Hirschfeld :111–126, 1975), we show that every countable model of \ is isomorphic to an existentially closed substructure of a polynomial time ultrapower. Moreover, one can take a substructure of a special form, namely a limit polynomial time ultrapower in the classical sense of Keisler Ultrafilters across (...)
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  • On the finite axiomatizability of.Chris Pollett - 2018 - Mathematical Logic Quarterly 64 (1-2):6-24.
    The question of whether the bounded arithmetic theories and are equal is closely connected to the complexity question of whether is equal to. In this paper, we examine the still open question of whether the prenex version of,, is equal to. We give new dependent choice‐based axiomatizations of the ‐consequences of and. Our dependent choice axiomatizations give new normal forms for the ‐consequences of and. We use these axiomatizations to give an alternative proof of the finite axiomatizability of and to (...)
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