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arXiv 1405.2891cs.LOcs.DS
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偏序集上的模型检验概率逻辑

Model Checking Existential Logic on Partially Ordered Sets

Simone Bova, Robert Ganian, Stefan Szeider

摘要:

我们研究了在有限偏序集(简称偏序集)中检验存在句(即使用存在量词和所有布尔连接词构建的前缀形式的一阶句)是否为真的问题。偏序集是一个自反的、反对称的、传递的有向图。这个问题包括基本的嵌入问题,找到一个同构的副本偏序集作为诱导子结构的另一个偏序集。模型检验存在逻辑已经是NP-困难的固定偏序集,因此,我们研究的结构性质的偏序集产生条件的固定参数易处理的问题时,参数化的句子。我们确定宽度作为一个中心的结构属性(偏序集的宽度是成对的不可比元素的子集的最大大小),我们的主要算法的结果是,模型检验存在逻辑类的有限偏序集的有界宽度是固定参数听话。我们观察到一个类似的现象,在经典的复杂性,我们证明了同构问题是多项式时间有界宽度的偏序集类听话,这解决了一个开放的问题,为了理论。我们围绕我们的主要算法结果的复杂性结果限制较少,自然相邻类的有限偏序集,在这个意义上建立其紧密性。我们还将我们的工作与(并证明其独立性)的基本固定参数的有界度和有界宽度的有向图的模型检验的易处理性结果。

英文摘要:

We study the problem of checking whether an existential sentence (that is, a first-order sentence in prefix form built using existential quantifiers and all Boolean connectives) is true in a finite partially ordered set (in short, a poset). A poset is a reflexive, antisymmetric, and transitive digraph. The problem encompasses the fundamental embedding problem of finding an isomorphic copy of a poset as an induced substructure of another poset. Model checking existential logic is already NP-hard on a fixed poset; thus we investigate structural properties of posets yielding conditions for fixed-parameter tractability when the problem is parameterized by the sentence. We identify width as a central structural property (the width of a poset is the maximum size of a subset of pairwise incomparable elements); our main algorithmic result is that model checking existential logic on classes of finite posets of bounded width is fixed-parameter tractable. We observe a similar phenomenon in classical complexity, where we prove that the isomorphism problem is polynomial-time tractable on classes of posets of bounded width; this settles an open problem in order theory. We surround our main algorithmic result with complexity results on less restricted, natural neighboring classes of finite posets, establishing its tightness in this sense. We also relate our work with (and demonstrate its independence of) fundamental fixed-parameter tractability results for model checking on digraphs of bounded degree and bounded clique-width.

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