On variants of conflict-free-coloring for hypergraphs

On variants of conflict-free-coloring for hypergraphs
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关于超图的无冲突着色的变体

DOI:
10.1016/j.dam.2016.12.018
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发表时间:
2011-07
影响因子:
1.1
通讯作者:
Hu Ze-Chun
Hu Ze-Chun
中科院分区:
数学3区
文献类型:
--
作者:
Cui Zhen;Hu Ze-Chun

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无顶点染色是超图的一种顶点染色,它要求每一个超边都有一个只出现在一个顶点上的颜色。更一般地,对于正整数k,存在k-无冲突着色(简称k-CF-着色)和k-强无冲突着色(简称k-SCF-着色)。设Hn是顶点集为Vn ={1,2,...,n}的超图,超边集En是Vn的所有(非空)子集的集合,这些子集由Vn的连续元素组成.首先,研究了Hn的k-SCF-染色,给出了Hn(k= 2,3)的k-SCF-染色色数的精确表达式,并给出了Hn(k= 2,3)的k-SCF-染色色数的上界和下界.其次,我们给出了H n对所有k的精确k-CF-染色数.
Conflict-free coloring is a kind of vertex coloring of hypergraphs requiring each hyperedge to have a color which appears only on one vertex. More generally, for a positive integer k there are k-conflict-free colorings (k-CF-colorings for short) and k-strong-conflict-free colorings (k-SCF-colorings for short). Let H n be the hypergraph of which the vertex-set is V n={1, 2,…, n} and the hyperedge-set E n is the set of all (non-empty) subsets of V n consisting of consecutive elements of V n. Firstly, we study the k-SCF-coloring of H n, give the exact k-SCF-coloring chromatic number of H n for k= 2, 3, and present upper and lower bounds of the k-SCF-coloring chromatic number of H n for all k. Secondly, we give the exact k-CF-coloring chromatic number of H n for all k.
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