Algebraic approach to promise constraint satisfaction
Algebraic approach to promise constraint satisfaction
复制标题
承诺约束满足的代数方法
DOI:
10.1145/3313276.3316300
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Bulín J
中科院分区:
文献类型:
--
作者:
Bulín J
The complexity and approximability of the constraint satisfaction problem (CSP) has been actively studied over the past 20 years. A new version of the CSP, the promise CSP (PCSP), has recently been proposed, motivated by open questions about the approximability of variants of satisfiability and graph colouring. The PCSP significantly extends the standard decision CSP. The complexity of CSPs with a fixed constraint language on a finite domain has recently been fully classified, greatly guided by the algebraic approach, which uses polymorphisms—high-dimensional symmetries of solution spaces—to analyse the complexity of problems. The corresponding classification for PCSPs is wide open and includes some long-standing open questions, such as the complexity of approximate graph colouring, as special cases.The basic algebraic approach to PCSP was initiated by Brakensiek and Guruswami, and in this article, we significantly extend it and lift it from concrete properties of polymorphisms to their abstract properties. We introduce a new class of problems that can be viewed as algebraic versions of the (Gap) Label Cover problem and show that every PCSP with a fixed constraint language is equivalent to a problem of this form. This allows us to identify a “measure of symmetry” that is well suited for comparing and relating the complexity of different PCSPs via the algebraic approach. We demonstrate how our theory can be applied by giving both general and specific hardness/tractability results. Among other things, we improve the state-of-the-art in approximate graph colouring by showing that, for anyk≥ 3, it is NP-hard to find a (2k-1)-colouring of a givenk-colourable graph.
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DOI:
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发表时间:
2017
期刊:
Logic in Computer Science
影响因子:
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作者:
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发表时间:
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期刊:
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期刊:
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影响因子:
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通讯作者:
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