简单图G的k阶谱矩定义为G的特征值的k阶幂之和,记为Mk(G).应用概率和代数的方法,对于几乎所有的图G,本文给出Mk(G)的一个精确估计.此外,对于几乎所有的多部图G,本文给出了Mk(G)的上界和下界.
The k-th spectral moment for a simple graph G,denoted by Mk(G),is the sum of k-th power of eigenvalues of G.By probabilistic and algebraic approaches,we formulate an exact estimate to Mk(G) for almost all graphs.Furthermore,we establish a lower and upper bound to Mk(G) for almost all multipartite graphs.