Super-connectivity of Kronecker products of split graphs, powers of cycles, powers of paths and complete graphs

Super-connectivity of Kronecker products of split graphs, powers of cycles, powers of paths and complete graphs
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分裂图、循环幂、路径幂和完全图的克罗内克乘积的超连通性

DOI:
10.1016/j.aml.2012.04.006
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发表时间:
2013
影响因子:
3.7
通讯作者:
Guo, Xiaofeng
Guo, Xiaofeng
中科院分区:
数学2区
文献类型:
--
作者:
Guo, Litao;Yang, Weihua;Guo, Xiaofeng

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两个连通图G1,G2的Kronecker积,记为G1×G2,是顶点集V(G1×G2)=V(G1)×V(G2),边集E(G1×G2)={(u1,v1)(u2,v2):u1 u2 ∈E(G1),v1 v2 ∈E(G2)}的图. G的k次幂Gkof是顶点集V(G)使得两个不同的顶点在Gkif且仅当它们在G中的距离至多为k时在Gkf中相邻的图。一个连通图G称为超κ,如果G的每个极小点割都是G中某个点的邻域集.在本文中,我们考虑了几种图和完全图的克罗内克积的超连通性。我们证明了当m≥3且G满足下列条件之一时,D=G×Kmis super-κ:(1)G是不完全分裂图,且|C|(2)G是路Pnk的幂图,使得n≥2k;(3)G是圈Cnr的幂图,使得n≥m且n≥ 2 r +1.
The Kronecker product of two connected graphs G1,G2, denoted by G1×G2, is the graph with vertex set V(G1×G2)=V(G1)×V(G2) and edge set E(G1×G2)={(u1,v1)(u2,v2):u1u2∈E(G1),v1v2∈E(G2)}. The kth power Gkof G is the graph with vertex set V(G) such that two distinct vertices are adjacent in Gkif and only if their distance apart in G is at most k. A connected graph G is called super-κ if every minimal vertex cut of G is the set of neighbors of some vertex in G. In this note, we consider the super-connectivity of the Kronecker products of several kinds of graphs and complete graphs. We show that D=G×Kmis super-κ for m≥3 and G satisfying one of the following conditions: (1) G is a non-complete split graph with |C|≥5; (2) G is a power graph of a path Pnksuch that n≥2k; (3) G is a power graph of a cycle Cnrsuch that n≥m and n≥2r+1.
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