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arXiv 1909.09093math.CO
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关于独立性和匹配的新结果

New results relating independence and matchings

Yair Caro, Randy Davila, Ryan Pepper

摘要:

在本文中,我们研究之间的关系\emph{matching number},书面$μ(G)$,和\emph{independence number},书面$α(G)$。我们的第一个主要结果是证明了\[ α(G) \le μ(G) + |X| - μ(G[N_G[X]]), \],其中$X$是$G$中最大独立集的\emph{any}交集。我们的第二个主要结果是显示\[ δ(G)α(G) \le Δ(G)μ(G), \],其中$δ(G)$和$Δ(G)$分别表示$G$的最小和最大顶点度。这些结果改进和推广了已知的$μ(G)$和$α(G)$之间的关系。此外,我们还给出了显示这些改进的例子。

英文摘要:

In this paper we study relationships between the \emph{matching number}, written $μ(G)$, and the \emph{independence number}, written $α(G)$. Our first main result is to show \[ α(G) \le μ(G) + |X| - μ(G[N_G[X]]), \] where $X$ is \emph{any} intersection of maximum independent sets in $G$. Our second main result is to show \[ δ(G)α(G) \le Δ(G)μ(G), \] where $δ(G)$ and $Δ(G)$ denote the minimum and maximum vertex degrees of $G$, respectively. These results improve on and generalize known relations between $μ(G)$ and $α(G)$. Further, we also give examples showing these improvements.

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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