Abstract
We discuss recent results on the propositional proof complexity of Frege proof systems, including some recently discovered quasipolynomial size proofs for the pigeonhole principle and the Kneser-Lovász theorem. These are closely related to formalizability in bounded arithmetic.
S. Buss—Supported in part by NSF grants CCF-121351 and DMS-1101228, and a Simons Foundation Fellowship 306202.
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Notes
- 1.
See Jeřábek [18] for an alternative formulation of extended Frege systems based directly on Boolean circuits.
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We thank Lev Beklemishev and Vladimir Podolskii for helpful comments.
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Buss, S. (2015). Propositional Proofs in Frege and Extended Frege Systems (Abstract). In: Beklemishev, L., Musatov, D. (eds) Computer Science -- Theory and Applications. CSR 2015. Lecture Notes in Computer Science(), vol 9139. Springer, Cham. https://doi.org/10.1007/978-3-319-20297-6_1
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