arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1107.0138math.COmath.PR
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关于超图的无冲突染色的变形

On variants of conflict-free-coloring for hypergraphs

Zhen Cui, Ze-Chun Hu

摘要:

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)。对于某个正整数$k$为%。设$H_n$是顶点集为$V_n=\{1,2,\dots,n\}$的超图,超边集$\cal{E}_n$是由$V_n$的连续元素组成的$V_n$的所有(非空)子集的集合.首先,我们研究了$H_n$的$k$-SCF-染色,给出了$H_n$对$k=2,3$的$k$-SCF-染色色数的精确表达式,并给出了对所有$k$,$H_n$的$k$-SCF-染色色数的上下界.其次,我们对所有的$k$,给出了$H_n$的精确$k$-CF-染色色数。

英文摘要:

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). %for some positive integer $k$. Let $H_n$ be the hypergraph of which the vertex-set is $V_n=\{1,2,\dots,n\}$ and the hyperedge-set $\cal{E}_n$ 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 $k$.

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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