On the kernel size of clique cover reductions for random intersection graphs

On the kernel size of clique cover reductions for random intersection graphs
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关于随机交集图的团覆盖缩减的内核大小

DOI:
10.1016/j.jda.2015.05.014
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发表时间:
2015
期刊:
J. Discrete Algorithms
影响因子:
--
通讯作者:
C. Hercher
C. Hercher
中科院分区:
--
文献类型:
--
作者:
T. Friedrich;C. Hercher

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用最少的团覆盖图的所有边是一个众所周知的NP-Hard问题。对于参数k是要使用的最大团数,问题变得固定参数容易处理。然而,假设指数时间假设,在最坏的情况下,不存在次指数大小的核。我们研究了具有n个顶点、边概率p和团覆盖大小为k的随机交图的平均核大小。我们考虑了Gramm,Guo,Hüffner和Niedermeier(2009)[17]的一组著名的约简规则,并证明了如果p从1有界,并且对于某个常数c>0,k<c对⁡n有界,则它们大概率地完全约化了图。这表明,对于像随机交集图这样的大型概率图类,期望的核大小可以大大小于已知的指数最坏情况下界。
Covering all edges of a graph by a minimum number of cliques is a well known NP-hard problem. For the parameter k being the maximal number of cliques to be used, the problem becomes fixed parameter tractable. However, assuming the Exponential Time Hypothesis, there is no kernel of subexponential size in the worst-case. We study the average kernel size for random intersection graphs with n vertices, edge probability p, and clique covers of size k. We consider the well-known set of reduction rules of Gramm, Guo, Hüffner, and Niedermeier (2009)[17] and show that with high probability they reduce the graph completely if p is bounded away from 1 and k< c log⁡ n for some constant c> 0. This shows that for large probabilistic graph classes like random intersection graphs the expected kernel size can be substantially smaller than the known exponential worst-case bounds.
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