图G是一个具有n个顶点m条边的(n,m)二部图。图G的EE指标和EEr指标是Estrada引入的图的两个不变量,二部图中有精确的EE(G)指标上下界的范围。在此基础上,得出(n,m)二部图的EEr(G)指标更为精确的上下界。
Let G be (n,m) bipartite graph with n vertices and m edges. Estrada introduced two graph invariants of the Estrada and Resolvent Estrada index of G, with lower and upper bounds for EE(G) index of bipartite graph. On this basis,we give new lower and upper bounds for EEr(G) index of (n,m) bipartite graph.