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arXiv 1111.6616cs.CCcs.DMmath.LO
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无限集上半格运算的约束满足可处理性

Constraint Satisfaction Tractability from Semi-lattice Operations on Infinite Sets

Manuel Bodirsky, Dugald Macpherson, Johan Thapper

摘要:

Jeavons、Cohen和Gyssens的一个著名结果表明,每一个通过半格运算保持约束的约束满足问题(CSP)都可以在多项式时间内求解。这是一个基本的事实,所谓的普遍代数方法的系统理论的温顺性和硬度在有限域约束满足。毫不奇怪,Jeavons等人的定理对任意无限域CSP都失败了。然而,许多实际感兴趣的CSP,特别是那些由来自人工智能的定性推理演算激励的CSP,可以用从模型理论的角度来看表现良好的约束语言来制定。特别是,这些约束语言的自同构群往往是大的,在这个意义上,自同构群的n-子集的轨道的数量是有界的一些功能在n。在本文中,我们提出了一个推广的定理由Jeavons等人。无限域CSP的n-子集的轨道的数量增长的次指数n,并证明了半格操作下的保持这样的CSP意味着多项式时间的易处理性。与Jeavons等人的结果不同,这包括许多无法通过Datatron解决的CSP。

英文摘要:

A famous result by Jeavons, Cohen, and Gyssens shows that every constraint satisfaction problem (CSP) where the constraints are preserved by a semi-lattice operation can be solved in polynomial time. This is one of the basic facts for the so-called universal-algebraic approach to a systematic theory of tractability and hardness in finite domain constraint satisfaction. Not surprisingly, the theorem of Jeavons et al. fails for arbitrary infinite domain CSPs. Many CSPs of practical interest, though, and in particular those CSPs that are motivated by qualitative reasoning calculi from Artificial Intelligence, can be formulated with constraint languages that are rather well-behaved from a model-theoretic point of view. In particular, the automorphism group of these constraint languages tends to be large in the sense that the number of orbits of n-subsets of the automorphism group is bounded by some function in n. In this paper we present a generalization of the theorem by Jeavons et al. to infinite domain CSPs where the number of orbits of n-subsets grows sub-exponentially in n, and prove that preservation under a semi-lattice operation for such CSPs implies polynomial-time tractability. Unlike the result of Jeavons et al., this includes many CSPs that cannot be solved by Datalog.

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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