arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0706.4099math.CO
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具有大独立数子图的图

On graphs with subgraphs of large independence numbers

Noga Alon, Benny Sudakov

摘要:

设G是一个n阶图,其中s= \log^3 n阶上的每个诱导子图都有一个大小至少为t= \log n的独立集. q=q(n)的最大值是多少,使得每个这样的G必须包含一个大小至少为q的独立集?这是Erdos和Hajnal提出的几个相关问题之一。我们证明了q(n)=Θ(\log^2 n/ \log \log n),研究了通过改变参数s和t得到的更一般的问题,并讨论了与相关Ramsey型问题的联系.

英文摘要:

Let G be a graph on n vertices in which every induced subgraph on s=\log^3 n vertices has an independent set of size at least t=\log n. What is the largest q=q(n) so that every such G must contain an independent set of size at least q ? This is one of several related questions raised by Erdos and Hajnal. We show that q(n)=Θ(\log^2 n/\log \log n), investigate the more general problem obtained by changing the parameters s and t, and discuss the connection to a related Ramsey-type problem.

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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