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A RAINBOW ERDOS-ROTHSCHILD PROBLEM

机译:彩虹鄂尔多斯-罗斯柴尔德问题

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We consider a multicolored version of a question posed by Erdos and Rothschild. For a fixed positive integer r and a fixed graph F, we look for n-vertex graphs that admit the maximum number of r-edge colorings with the property that there is no copy of F for which all edges are assigned different colors. We show that when F is a bipartite graph with at least three edges and r = 3, the number of r-edge colorings of an extremal configuration is close to the number of such edge colorings of the complete graph K-n. On the other hand, for the rainbow pattern of F = Kk+1, the Turan graph T-k(n) is the only extremal configuration for any r = ro(k) and large n.
机译:我们考虑由鄂尔多斯和罗斯柴尔德(Rothschild)提出的问题的彩色版本。对于固定的正整数r和固定的图F,我们寻找n顶点图,该图允许最大数量的r边着色,其特性是没有F的副本为所有边缘分配不同的颜色。我们表明,当F是具有至少三个边且r> = 3的二部图时,极值配置的r边着色的数量接近完整图K-n的这种边着色的数量。另一方面,对于F = Kk + 1的彩虹模式,图兰图T-k(n)是任何r> = ro(k)和大n的唯一极值配置。

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