图G所有特征值的绝对值的和称为该图的能量,在采用quasi-序方法给出许多关于图G能量刻画结果的基础上,使用将quasi-序与一种新的方法相结合的方式,给出了具有k个悬挂点的n顶点树集中取到第二小能量的树的刻画.
The energy of graph is the sum of all the absolute value of the eigenvalues of the graph. Some results about the description of the energy of graph have been obtained by the quasi-sequence method. We characterize the trees with the second-smallest energy and k suspending vertices by the quasi- sequence way and a new method.