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arXiv 1001.4987cs.CC
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逼近有界度布尔函数# CSP的复杂性

The Complexity of Approximating Bounded-Degree Boolean #CSP (Extended Abstract)

Martin E. Dyer, Leslie Ann Goldberg, Markus Jalsenius, David Richerby

摘要:

CSP实例的度是变量可能出现在约束范围中的最大次数。考虑了约束语言中包含两个一元常数关系{0}和{1}的有界度布尔CSP的近似计数问题。当最大度至少为25时,我们得到了这个问题复杂性的完整分类。如果约束语言中的每一个关系都是仿射的,则它在多项式时间内是精确可解的。如果每一个关系都可以表示为{0}、{1}和二元蕴涵的合取,则它等价于二部图中独立集的近似计数问题。否则,没有FPRAS,除非NP=RP。对于较低的度界限,出现额外的情况下,其中的复杂性是有关的复杂性,近似计数的超图中的独立集。

英文摘要:

The degree of a CSP instance is the maximum number of times that a variable may appear in the scope of constraints. We consider the approximate counting problem for Boolean CSPs with bounded-degree instances, for constraint languages containing the two unary constant relations {0} and {1}. When the maximum degree is at least 25 we obtain a complete classification of the complexity of this problem. It is exactly solvable in polynomial-time if every relation in the constraint language is affine. It is equivalent to the problem of approximately counting independent sets in bipartite graphs if every relation can be expressed as conjunctions of {0}, {1} and binary implication. Otherwise, there is no FPRAS unless NP=RP. For lower degree bounds, additional cases arise in which the complexity is related to the complexity of approximately counting independent sets in hypergraphs.

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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