双圈图的扩展能量的上界

Upper Bounds for the Extended Energy of Bicyclic Graphs

图G的扩展能量E_(ex)(G)定义为图的扩展邻接矩阵特征值的绝对值之和。利用分析和基本不等式技巧,得出了双圈图扩展能量的几个上界。

The extended energy of a graph G,denoted by Eex（ G）,is defined as the sum of the absolute values of all eigenvalues of the extended adjacency matrix of a graph. By using the technique of analysis and basic inequality,some upper bounds for the extended energy of bicyclic graph were obtained.