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arXiv 1209.2218math.COcs.DM
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森林的积维数与有界树宽图

Product Dimension of Forests and Bounded Treewidth Graphs

L. Sunil Chandran, Rogers Mathew, Deepak Rajendraprasad, Roohani Sharma

摘要:

图G的积维数定义为使得G是l个完全图的直积的诱导子图的最小自然数l。本文研究森林、有界树宽图和k-退化图的积维数。我们证明了n个顶点上的每一个森林的乘积维数至多为1.441logn+3。这改进了由于Poljak和Pultr的最著名的3logn上界上界。将得出上界的技术进行了扩展,并结合正交拉丁方存在性的结果,证明了树宽不超过t的n个顶点的每个图的积维数不超过(t+2)(logn+1)。我们还证明了n阶k-退化图的乘积维数至多为\ceil{8.317klogn} +1。这改进了Eaton和Rodl的32 klogn的上界。

英文摘要:

The product dimension of a graph G is defined as the minimum natural number l such that G is an induced subgraph of a direct product of l complete graphs. In this paper we study the product dimension of forests, bounded treewidth graphs and k-degenerate graphs. We show that every forest on n vertices has a product dimension at most 1.441logn+3. This improves the best known upper bound of 3logn for the same due to Poljak and Pultr. The technique used in arriving at the above bound is extended and combined with a result on existence of orthogonal Latin squares to show that every graph on n vertices with a treewidth at most t has a product dimension at most (t+2)(logn+1). We also show that every k-degenerate graph on n vertices has a product dimension at most \ceil{8.317klogn}+1. This improves the upper bound of 32klogn for the same by Eaton and Rodl.

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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