More on Laplacian estrada indices of trees

Abstract

The Laplacian Estrada index of a graph G is defined as LEE(G) =σni=1eμi, where μ1,μ2,..., μn are the Laplacian eigenvalues of G. We determine the unique tree with maximum Laplacian Estrada index among the set of trees with given bipartition. We also determine the unique trees with the third, the fourth, the fifth and the sixth maximum Laplacian Estrada indices.