关于Wiener指标、距离共谱与透射正则图
On the Wiener index, distance cospectrality and transmission regular graphs
摘要：
本文研究了图的距离矩阵的各种代数性质和图论性质。如果两个图的距离矩阵具有相同的谱，则称这两个图是$D$ -共谱图.我们构造了具有不同直径和不同Wiener指数的$D$ -共谱图对.一个图是$k$ -传输正则的，如果它的距离矩阵有常数行和等于$k$ .我们建立了$k$ -传输-正则图的行和的紧上、下界。最后，我们确定了线性$k$ -树的Wiener指标及其复杂性，并利用图的Laplacian特征值得到了块团图的Wiener指标的一个封闭形式.后者导致了一个推广的结果树，独立证明了Mohar和梅里斯。
英文摘要：
In this paper, we investigate various algebraic and graph theoretic properties of the distance matrix of a graph. Two graphs are $D$-cospectral if their distance matrices have the same spectrum. We construct infinite pairs of $D$-cospectral graphs with different diameter and different Wiener index. A graph is $k$-transmission-regular if its distance matrix has constant row sum equal to $k$. We establish tight upper and lower bounds for the row sum of a $k$-transmission-regular graph in terms of the number of vertices of the graph. Finally, we determine the Wiener index and its complexity for linear $k$-trees, and obtain a closed form for the Wiener index of block-clique graphs in terms of the Laplacian eigenvalues of the graph. The latter leads to a generalization of a result for trees which was proved independently by Mohar and Merris.
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