Contractible subgraphs in k‐connected graphs

Contractible subgraphs in k‐connected graphs
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k连通图中的可收缩子图

DOI:
10.1002/jgt.20227
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发表时间:
2007
影响因子:
0.9
通讯作者:
Xiaoyan Zhang
Xiaoyan Zhang
中科院分区:
数学3区
文献类型:
--
作者:
Zemin Jin;Xingxing Yu;Xiaoyan Zhang

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对于图G,我们定义了一个图T(G),它的顶点是G中的三角形,且T(G)的两个顶点是相邻的,如果它们在G中对应的三角形共享一条边。Kawa abayashi证明了:如果G是k-连通图,且T(G)不含边,则G至多有一个k-可缩团,其规模至多为3,推广了Thomassen的一个结果。本文进一步推广了Kawa abayashi的结果,证明了如果G是k-连通的,且T(G)的最大次数至多为1,则G至多有一个大小为3的k-可缩团,或者G存在独立的边e和f,使得e和f包含在共享一条边的三角形中,且G/e/f是k-连通的。©2006威利期刊公司.图论杂志55:121-136,2007
For a graph G we define a graph T(G) whose vertices are the triangles in G and two vertices of T(G) are adjacent if their corresponding triangles in G share an edge. Kawarabayashi showed that if G is a k‐connected graph and T(G) contains no edge, then G admits a k‐contractible clique of size at most 3, generalizing an earlier result of Thomassen. In this paper, we further generalize Kawarabayashi's result by showing that if G is k‐connected and the maximum degree of T(G) is at most 1, then G admits a k‐contractible clique of size at most 3 or there exist independent edges e and f of G such that e and f are contained in triangles sharing an edge and G/e/f is k‐connected. © 2006 Wiley Periodicals, Inc. J Graph Theory 55: 121–136, 2007
图具有 κ 可收缩边的一些禁止子图条件
DOI: --
发表时间: 2003
期刊: Discrete Math. 267, no.1-3
影响因子: --
作者:
Ando;Kiyoshi;Kawarabayashi;Ken-ichi
通讯作者: Ken-ichi
k 连接图中的可收缩边和三角形
DOI: --
发表时间: 2002
期刊: J.Combin. Theory Ser.B 85,no.2
影响因子: --
作者:
K.Kawarabayashi;A.Nakamoto;Y.Oda;K.Ota;S.Tazawa;M.Watanabe;K.Kawarabayashi
通讯作者: K.Kawarabayashi