arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0803.3406math.CO
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随机图中的因子

Factors in random graphs

A. Johansson, J. Kahn, V. Vu

摘要:

设$H$是一个在$v$顶点上的固定图.对于$n$ -顶点图$G$,其中$n$可被$v$整除,$G$的$H$ -{ \em因子}是$H$的$n/v$副本的集合,其顶点集划分$V(G)$。本文研究了Erdens-Rényi随机图(在$n$点上)含有$H$ -因子的性质的阈值$th_{H} (n)$.我们的结果确定了所有严格平衡的$H$的$th_{H} (n)$。这里的方法毫无困难地推广到超图。作为推论,我们得到了随机$k$ -一致超图中完美匹配的阈值,解决了著名的“Shamir问题”。"

英文摘要:

Let $H$ be a fixed graph on $v$ vertices. For an $n$-vertex graph $G$ with $n$ divisible by $v$, an $H$-{\em factor} of $G$ is a collection of $n/v$ copies of $H$ whose vertex sets partition $V(G)$. In this paper we consider the threshold $th_{H} (n)$ of the property that an Erdős-Rényi random graph (on $n$ points) contains an $H$-factor. Our results determine $th_{H} (n)$ for all strictly balanced $H$. The method here extends with no difficulty to hypergraphs. As a corollary, we obtain the threshold for a perfect matching in random $k$-uniform hypergraph, solving the well-known "Shamir's problem."

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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