Super restricted edge connectivity of regular edge-transitive graphs

Super restricted edge connectivity of regular edge-transitive graphs
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规则边传递图的超限制边连通性

DOI:
10.1016/j.dam.2011.12.004
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发表时间:
2012-05
影响因子:
1.1
通讯作者:
Zhou, Jin-Xin
Zhou, Jin-Xin
中科院分区:
数学3区
文献类型:
--
作者:
Zhou, Jin-Xin

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如果连通图的边切割将图分成至少为2阶的分量,则称为受限边切割;当G−F对G的每一个最小限制边切F都包含一条孤立边时,则图G是超限制边连通的。本文证明了至少3价的连通正则边传递图当且仅当它是三维超立方体,或周长至少为6阶的四价边传递图不是超限制边连通的。因此,存在无穷多个k≥3的非超限制边连通的k正则哈密顿图。这就否定了[J]中的问题。欧峰,张锋,正则图的超受限边连通性,图与组合,21(2005)459-467],关于受限边连通图与哈密顿图的关系。
An edge cut of a connected graph is called restricted if it separates this graph into components each having order at least 2; a graph G is super restricted edge connected if G−F contains an isolated edge for every minimum restricted edge cut F of G. It is proved in this paper that a connected regular edge-transitive graph of valency at least 3 is not super restricted edge connected if and only if it is either the three dimensional hypercube, or a tetravalent edge-transitive graph of girth 3 and of order at least 6. As a result, there are infinitely many k-regular Hamiltonian graphs with k≥3 which are not super restricted edge connected. This answers negatively a question in [J. Ou, F. Zhang, Super restricted edge connectivity of regular graphs, Graphs & Combin. 21 (2005) 459–467] regarding the relationship between restricted edge connected graphs and Hamiltonian graphs.
DOI: 10.2307/3616070
发表时间: 1973-12
期刊: The Mathematical Gazette
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