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arXiv 1601.04520math.LOcs.CCcs.LO
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一元结构一阶归约的二分法

A Dichotomy for First-Order Reducts of Unary Structures

Manuel Bodirsky, Antoine Mottet

AI总结:

本文研究有限有界齐次结构归约的约束满足问题,提出从无限域到有限域的多项式时间归约,并利用拓扑多态性克隆获得可解性条件,进而证明Bodirsky-Pinsker猜想对一元语言归约类成立。

摘要:

许多自然决策问题可以表述为有限有界齐次结构的归约 $\mathbb{A}$ 的约束满足问题(CSP)。这类问题是有限域上CSP类的大规模推广。我们的第一个结果是从此类无限域CSP到有限域CSP的一般多项式时间归约。我们利用此归约获得了新的强大多项式时间可解性条件,这些条件可以用 $\mathbb{A}$ 的拓扑多态性克隆来表达。此外,我们研究了结构 $\mathbb{A}$ 的CSP子类 $\mathcal{C}$,其中 $\mathbb{A}$ 是带有幺元语言结构的归约。该类 $\mathcal{C}$ 也适当地扩展了所有有限域CSP的类。我们应用新的可解性条件证明了Bodirsky和Pinsker关于有限有界齐次结构归约的一般可解性猜想对于类 $\mathcal{C}$ 成立。

英文摘要:

Many natural decision problems can be formulated as constraint satisfaction problems for reducts $\mathbb{A}$ of finitely bounded homogeneous structures. This class of problems is a large generalisation of the class of CSPs over finite domains. Our first result is a general polynomial-time reduction from such infinite-domain CSPs to finite-domain CSPs. We use this reduction to obtain new powerful polynomial-time tractability conditions that can be expressed in terms of the topological polymorphism clone of $\mathbb{A}$. Moreover, we study the subclass $\mathcal{C}$ of CSPs for structures $\mathbb{A}$ that are reducts of a structure with a unary language. Also this class $\mathcal{C}$ properly extends the class of all finite-domain CSPs. We apply our new tractability conditions to prove the general tractability conjecture of Bodirsky and Pinsker for reducts of finitely bounded homogeneous structures for the class $\mathcal{C}$.

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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