An exact algorithm for the Boolean connectivity problem for k-CNF
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We present an exact algorithm for a PSPACE-complete problem, denoted by CONNkSAT, which asks whether the solution space for a given k-CNF formula is connected on the n-dimensional hypercube. The problem is known to be PSPACE-complete for k≥3, and polynomial solvable for k≤2(Gopalan et al., 2009).We show that CONNkSAT for k≥3 is solvable in time O((2−ϵ_{k})[n]) for some constant ϵ_{k}>0, where ϵk depends only on k, but not on n. This result is considered to be interesting due to the following fact shown by Calabro: QBF-3-SAT, which is a typical PSPACE-complete problem, is not solvable in time O((2−ϵ)[n]) for any constant ϵ>0, provided that the SAT problem (with no restriction to the clause length) is not solvable in time O((2−ϵ)[n]) for any constant ϵ>0.
収録刊行物
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- Theoretical Computer Science
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Theoretical Computer Science 412 (35), 4613-4618, 2011-08
Elsevier B.V.
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詳細情報
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- CRID
- 1050564285674339968
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- NII論文ID
- 120003338848
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- NII書誌ID
- AA00862688
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- ISSN
- 03043975
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- HANDLE
- 2433/145991
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- IRDB
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