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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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  • Circuit lower bounds in bounded arithmetics.Ján Pich - 2015 - Annals of Pure and Applied Logic 166 (1):29-45.
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  • Multifunction algebras and the provability of PH↓.Chris Pollett - 2000 - Annals of Pure and Applied Logic 104 (1-3):279-303.
    We introduce multifunction algebras B i τ where τ is a set of 0 or 1-ary terms used to bound recursion lengths. We show that if for all ℓ ∈ τ we have ℓ ∈ O then B i τ = FP Σ i−1 p , those multifunctions computable in polynomial time with at most O )) queries to a Σ i−1 p witness oracle for ℓ ∈ τ and p a polynomial. We use our algebras to obtain independence results (...)
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  • Feasibly constructive proofs of succinct weak circuit lower bounds.Moritz Müller & Ján Pich - 2020 - Annals of Pure and Applied Logic 171 (2):102735.
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