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浙江大学学报(理学版)  2021, Vol. 48 Issue (2): 180-188    DOI: 10.3785/j.issn.1008-9497.2021.02.007
数学与计算机科学     
关于两个图的一类新连接图的谱
刘剑萍, 吴先章, 陈锦松
福州大学 数学与计算机科学学院, 福建 福州 350116
On the spectrum of a new join of two graphs
LIU Jianping, WU Xianzhang, CHEN Jinsong
College of Mathematics and Computer Science, Fuzhou University, Fuzhou 350116, China
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摘要: 给定2个图G1G2,设G1的边集E(G1)={e1,e2,?,em1},则图G1G2可由一个G1m1G2通过在G1对应的每条边外加一个孤立点,新增加的点记为U={u1,u2,?,um1},将ui分别与第iG2的所有点以及G1中的边ei的端点相连得到,其中i=?1,2,?,m1。得到:(i)当G1是正则图,G2是正则图或完全二部图时,确定了G1G2的邻接谱(A-谱)。(ii)当G1是正则图,G2是任意图时,给出了G1G2的拉普拉斯谱(L-谱)。(iii)当G1G2都是正则图时,给出了G1G2的无符号拉普拉斯谱(Q-谱)。作为以上结论的应用,构建了无限多对A-同谱图、L-同谱图和Q-同谱图;同时当G1是正则图时,确定了G1G2支撑树的数量和Kirchhoff指数。
关键词: 同谱图支撑树基尔霍夫(Kirchhoff)指数    
Abstract: Given graphs G1 and G2,let E(G1)={e1,e2,?,em1} be the edge set of G1,the graph G1G2 can be obtained from one copy of G1 and m1 copies of G2 by adding a new vertex corresponding to each edge of G1, letting the resulting new vertex set be U={u1,u2,?,um1}, and joining ui with each vertex of i-th copy of G2 and with the endpoints of ei, for i=1,2,?,m1. We can determine: (i) the adjacency spectrum of G1G2 for G1,G2 are both regular graphs, or G1 is regular graph, but G2 is a complete bipartite graph; (ii) the Laplacian spectrum of G1G2 when G1 is a regular graph and G2 is an arbitrary graph; (iii) the signless Laplacian spectrum of G1G2 for both G1 and G2 are regular graphs. As applications, we construct infinitely many pairs of A-cospectral graphs, L-cospectral graphs and Q-cospectral graphs. and determine the number of spanning trees and the Kirchhoff index of G1G2,where G1 is a regular graph.
Key words: spectrum    cospectral graphs    spanning trees    Kirchhoff index
收稿日期: 2018-04-12 出版日期: 2021-03-18
CLC:  O  
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刘剑萍, 吴先章, 陈锦松. 关于两个图的一类新连接图的谱[J]. 浙江大学学报(理学版), 2021, 48(2): 180-188.

LIU Jianping, WU Xianzhang, CHEN Jinsong. On the spectrum of a new join of two graphs. Journal of Zhejiang University (Science Edition), 2021, 48(2): 180-188.

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https://www.zjujournals.com/sci/CN/10.3785/j.issn.1008-9497.2021.02.007        https://www.zjujournals.com/sci/CN/Y2021/V48/I2/180

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