Coloring and the Lovász Local Lemma

Coloring and the Lovász Local Lemma
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DOI:
10.1016/j.aml.2009.02.008
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发表时间:
2010-03
期刊:
Appl. Math. Lett.
影响因子:
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通讯作者:
Xing Chen;Zhihua Du;J. Meng
Xing Chen;Zhihua Du;J. Meng
中科院分区:
其他
文献类型:
--
作者:
Xing Chen;Zhihua Du;J. Meng

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Lovász局部引理给出了一个超图是2-可着色的充分条件,也就是说,有一个点着色为蓝色或红色,使得没有边是单色的。该方法给出了一个一般性定理,例如,如果H是一个超图,其中每条边至少包含9个点,并且每条边中的每个点至多包含11条边,则H是2-可着色的。本文利用局部引理的“不平衡”形式,给出了超图的t-染色和超图的2-染色的充分条件,使得每边至少含有2个点。
The Lovász Local Lemma yields sufficient conditions for a hypergraph to be 2-colorable, that is, to have a coloring of the points blue or red such that no edge is monochromatic. The method yields a general theorem, which shows for example, if H is a hypergraph in which each edge contains at least 9 points and each point is contained in at most 11 edges, then H is 2-colorable. In this paper, we use the ‘lopsided’ version of the Local Lemma to give some sufficient conditions on t-coloring to hypergraphs and 2-coloring to hypergraphs such that each edge contains at least 2 points of each color.