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arXiv math/0509397math.CO
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无限图的门格尔定理

Menger's theorem for infinite graphs

Ron Aharoni, Eli Berger

摘要:

我们证明了Menger定理对无限图是有效的,其强形式为:设$A$和$B$是可能无限有向图中的两个顶点集.则存在不相交的$A$-$B$路径的集合$\cp$,以及将$A$与$B$分开的顶点的集合$S$,使得$S$由从$\cp$中的每条路径中精确地选择一个顶点组成。这解决了一个古老的猜想Erdos。

英文摘要:

We prove that Menger's theorem is valid for infinite graphs, in the following strong form: let $A$ and $B$ be two sets of vertices in a possibly infinite digraph. Then there exist a set $\cp$ of disjoint $A$-$B$ paths, and a set $S$ of vertices separating $A$ from $B$, such that $S$ consists of a choice of precisely one vertex from each path in $\cp$. This settles an old conjecture of Erdős.

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