arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1701.05855math.CO
收藏

一致超图的明智划分

Judicious partitions of uniform hypergraphs

John Haslegrave

摘要:

具有$m$边的任何图的顶点可以被划分成两个部分,使得每个部分至少满足$\frac{2m}{3}$边。Bollobás和Bollason证明了任何具有$m$边的$r$ -均匀超图的顶点可以同样地划分为$r$类,使得每个部分至少满足$\frac{r}{2r-1}m$边。在本文中,我们证明了一个较弱的陈述,即对于每个$r\ge 4$,可以找到$r$类的划分,其中每个类至少满足$\frac{r}{3r-4}m$边,这是对之前界限的实质性改进。

英文摘要:

The vertices of any graph with $m$ edges may be partitioned into two parts so that each part meets at least $\frac{2m}{3}$ edges. Bollobás and Thomason conjectured that the vertices of any $r$-uniform hypergraph with $m$ edges may likewise be partitioned into $r$ classes such that each part meets at least $\frac{r}{2r-1}m$ edges. In this paper we prove the weaker statement that, for each $r\ge 4$, a partition into $r$ classes may be found in which each class meets at least $\frac{r}{3r-4}m$ edges, a substantial improvement on previous bounds.

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。

↑