论文标题
第二大特征值小于$ 1/2 $的图表
Graphs with second largest eigenvalue less than $1/2$
论文作者
论文摘要
我们以小于1/2的第二大特征值来表征简单的连接图，由13类特定图组成。这13个类暗示[1/2，\ sqrt {2+ \ sqrt {5}}] $，其中$ c_2 $是最低实际数字$ c $，其中每个实际数字大于$ c $的最低实际数量$ c $都是第二大eigenvalues eigenvaluess eigenvaluess的限制点。我们把它当作问题。
We characterize the simple connected graphs with the second largest eigenvalue less than 1/2, which consists of 13 classes of specific graphs. These 13 classes hint that $c_{2}\in [1/2, \sqrt{2+\sqrt{5}}]$, where $c_2$ is the minimum real number $c$ for which every real number greater than $c$ is a limit point in the set of the second largest eigenvalues of the simple connected graphs. We leave it as a problem.
