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• W48421743 abstract "In 2010, Spence and Van Gelder presented a family of CNF formulas based on combinatorial block designs. They showed empirically that this construction yielded small instances that were orders of magnitude harder for state-of-the-art SAT solvers than other benchmarks of comparable size, but left open the problem of proving theoretical lower bounds. We establish that these formulas are exponentially hard for resolution and even for polynomial calculus, which extends resolution with algebraic reasoning. We also present updated experimental data showing that these formulas are indeed still hard for current CDCL solvers, provided that these solvers do not also reason in terms of cardinality constraints (in which case the formulas can become very easy). Somewhat intriguingly, however, the very hardest instances in practice seem to arise from so-called fixed bandwidth matrices, which are provably easy for resolution and are also simple in practice if the solver is given a hint about the right branching order to use. This would seem to suggest that CDCL with current heuristics does not always search efficiently for short resolution proofs, despite the theoretical results of [Pipatsrisawat and Darwiche 2011] and [Atserias, Fichte, and Thurley 2011]." @default.
• W48421743 created "2016-06-24" @default.
• W48421743 creator A5003633660 @default.
• W48421743 creator A5090900538 @default.
• W48421743 date "2014-01-01" @default.
• W48421743 modified "2023-10-16" @default.
• W48421743 title "Long Proofs of (Seemingly) Simple Formulas" @default.
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• W48421743 doi "https://doi.org/10.1007/978-3-319-09284-3_10" @default.
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