When is an Almost Monochromatic K4 Guaranteed?

When is an Almost Monochromatic K4 Guaranteed?
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什么时候可以保证 K4 几乎单色?

DOI:
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发表时间:
2008
期刊:
Combinatorics, probability & computing
影响因子:
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通讯作者:
D. Mubayi
D. Mubayi
中科院分区:
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文献类型:
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作者:
A. Kostochka;D. Mubayi

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假设n >(log k)ck,其中c是一个固定的正常数。我们证明,无论如何Kn的边缘是着色的k颜色,有一个副本K4的边缘接收最多两种颜色。这改进了之前kc′k的最佳界,其中c′是一个固定的正常数,这是由经典Ramsey数的结果得出的。
Suppose that n > (log k)ck, where c is a fixed positive constant. We prove that, no matter how the edges of Kn are coloured with k colours, there is a copy of K4 whose edges receive at most two colours. This improves the previous best bound of kc′k, where c′ is a fixed positive constant, which follows from results on classical Ramsey numbers.