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arXiv 1507.05463cs.DS
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关于高秩宽图问题的求解

Solving Problems on Graphs of High Rank-Width

Eduard Eiben, Robert Ganian, Stefan Szeider

摘要:

一个图G到一个指定的图类H的一个调制器是一个顶点集,其删除使G成为H。调制器对各种易处理的图类的基数长期以来一直被用作结构参数,可以利用它来获得FPT算法的一系列困难的问题。在这里,我们调查发生了什么事时,一个图包含一个调制器,这是大的,但“结构良好”(在这个意义上有界的秩宽度)。这样的调制器仍然可以被利用来获得有效的算法吗?是否有可能有效地找到这样的调制器?我们首先表明,从这种结构良好的调制器导出的参数严格比调制器和秩宽度本身的基数更一般。然后,我们开发了一个FPT算法找到这样的结构良好的调制器,任何图形类,其特征在于一个有限的一组禁止诱导子图。我们继续展示如何结构良好的调制器可以用来获得有效的参数化算法的最小顶点覆盖和最大团。最后,我们使用结构良好的调制器开发的算法元定理,用于决定在一元二阶(MSO)逻辑表达的问题,并证明了这个结果是紧的意义上说,它不能推广到LinEMSO问题。

英文摘要:

A modulator of a graph G to a specified graph class H is a set of vertices whose deletion puts G into H. The cardinality of a modulator to various tractable graph classes has long been used as a structural parameter which can be exploited to obtain FPT algorithms for a range of hard problems. Here we investigate what happens when a graph contains a modulator which is large but "well-structured" (in the sense of having bounded rank-width). Can such modulators still be exploited to obtain efficient algorithms? And is it even possible to find such modulators efficiently? We first show that the parameters derived from such well-structured modulators are strictly more general than the cardinality of modulators and rank-width itself. Then, we develop an FPT algorithm for finding such well-structured modulators to any graph class which can be characterized by a finite set of forbidden induced subgraphs. We proceed by showing how well-structured modulators can be used to obtain efficient parameterized algorithms for Minimum Vertex Cover and Maximum Clique. Finally, we use well-structured modulators to develop an algorithmic meta-theorem for deciding problems expressible in Monadic Second Order (MSO) logic, and prove that this result is tight in the sense that it cannot be generalized to LinEMSO problems.

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