arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1701.06451math.CO
收藏

三部3-图匹配的一个稳定性定理

A Stability Theorem for Matchings in Tripartite 3-Graphs

Penny Haxell, Lothar Narins

摘要:

由已有的结果可知,每类顶点为$n$的正则正度三部超图至少有$n/2$的匹配数.这个界是最好的可能的,并且极值配置是唯一的。在这里,我们证明了这一说法的一个稳定性版本,建立每一个正则三部超图的匹配数最多$(1 + \varepsilon)n/2$是接近结构的极值配置,其中“接近度”是衡量一个明确的功能$\varepsilon$。我们还回答了Aharoni,Kotlar和Ziv关于超图匹配的一个问题,具有更一般的度条件。

英文摘要:

It follows from known results that every regular tripartite hypergraph of positive degree, with $n$ vertices in each class, has matching number at least $n/2$. This bound is best possible, and the extremal configuration is unique. Here we prove a stability version of this statement, establishing that every regular tripartite hypergraph with matching number at most $(1 + \varepsilon)n/2$ is close in structure to the extremal configuration, where "closeness" is measured by an explicit function of $\varepsilon$. We also answer a question of Aharoni, Kotlar and Ziv about matchings in hypergraphs with a more general degree condition.

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。

↑