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arXiv 1606.02544math.CO
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图的拓扑色结果的加强

Strengthening topological colorful results for graphs

Meysam Alishahi, Hossein Hajiabolhassan, Frédéric Meunier

摘要:

当适当有色图的色数的拓扑下界满足一定条件时,各种结果都保证了大的完全二部图的存在性。我们推广了三个这类定理,分别来自Simonyi和Tardos(Combinatorica,2006),Simonyi,Tardif和Zsbán(The Electronic Journal of Combinatorics,2013)和Chen(Journal of Combinatorial Theory,Series A,2011)。作为Chen定理的推广,我们得到了一类新的图族,它们的色数等于它们的圆色数,并且满足Hedetniemi关于圆色数的猜想.

英文摘要:

Various results ensure the existence of large complete bipartite graphs in properly colored graphs when some condition related to a topological lower bound on the chromatic number is satisfied. We generalize three theorems of this kind, respectively due to Simonyi and Tardos (Combinatorica, 2006), Simonyi, Tardif, and Zsbán (The Electronic Journal of Combinatorics, 2013), and Chen (Journal of Combinatorial Theory, Series A, 2011). As a consequence of the generalization of Chen's theorem, we get new families of graphs whose chromatic number equals their circular chromatic number and that satisfy Hedetniemi's conjecture for the circular chromatic number.

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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