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arXiv 1409.2117math.CO
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点传递图的4-因子临界性

4-Factor-criticality of vertex-transitive graphs

Wuyang Sun, Heping Zhang

摘要:

一个$n$阶图是$p$ -因子关键的,其中$p$是与$n$具有相同奇偶性的整数,如果移除任何一组$p$顶点导致具有完美匹配的图。1-因子-临界图和2-因子-临界图分别是著名的因子-临界图和双临界图。如果一个连通点传递图的阶数为奇数,则它是因子临界的,否则它是基本二部图或双临界图。本文证明了偶数阶至少为6的点传递非二部图是4-因子临界图的充要条件是它的度至少为5。这个结果意味着偶数阶且度至少为5的连通非二部Cayley图是2-可扩的。

英文摘要:

A graph of order $n$ is $p$-factor-critical, where $p$ is an integer of the same parity as $n$, if the removal of any set of $p$ vertices results in a graph with a perfect matching. 1-factor-critical graphs and 2-factor-critical graphs are well-known factor-critical graphs and bicritical graphs, respectively. It is known that if a connected vertex-transitive graph has odd order, then it is factor-critical, otherwise it is elementary bipartite or bicritical. In this paper, we show that a connected vertex-transitive non-bipartite graph of even order at least 6 is 4-factor-critical if and only if its degree is at least 5. This result implies that each connected non-bipartite Cayley graphs of even order and degree at least 5 is 2-extendable.

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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