利用距离正则图的特征值方法和交叉数的性质，证明了具有下列交叉阵列的距离正则图是不存在的。
By using the eigenvalue techniques and properties of intersection Numbers, it is obtained that the distance regular graphs with the following intersection arrays are nonexistence.
树作为一类简单而特殊的图，对它的特征值的研究能帮助了解谱的一些代数性质。
As tree is an easy and special graph, the study of its eigenvalue can help understand some algebra nature of spectrum.
对于非奇异单圈混合图，范益政给出了其最小特征值所对应特征向量的一个很好结构性质。
In the case of being a unicyclic mixed graph, Fan Yi-Zheng gives a remarkable result on the structure of the eigenvectors corresponding to its smallest eigenvalue.
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