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arXiv 1502.03482cs.CC
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有值CSP可处理的必要条件

Necessary conditions for tractability of valued CSPs

Johan Thapper, Stanislav Zivny

摘要:

约束语言和克隆理论的结合是研究约束满足问题复杂性的一条富有成果的研究路线。在最近的结果中,Cohen等人[SICOMP'13]描述了值约束语言和所谓的加权克隆之间的伽罗瓦连接。本文研究了加权克隆的结构。我们扩展的结果信条和Zivny从[CP'11/SICOMP'13]的类型的权重必然包含在每个非平凡的加权克隆。这个结果有直接的计算复杂性后果,因为它提供了必要的条件,易处理的加权克隆,从而有价值的约束语言。我们证明了一些必要条件也是足够的易处理性,而其他人是可证明的。

英文摘要:

The connection between constraint languages and clone theory has been a fruitful line of research on the complexity of constraint satisfaction problems. In a recent result, Cohen et al. [SICOMP'13] have characterised a Galois connection between valued constraint languages and so-called weighted clones. In this paper, we study the structure of weighted clones. We extend the results of Creed and Zivny from [CP'11/SICOMP'13] on types of weightings necessarily contained in every nontrivial weighted clone. This result has immediate computational complexity consequences as it provides necessary conditions for tractability of weighted clones and thus valued constraint languages. We demonstrate that some of the necessary conditions are also sufficient for tractability, while others are provably not.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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