Title of article
Lower bounds for Estrada index and Laplacian Estrada index
Author/Authors
Bamdad، نويسنده , , Hamidreza and Ashraf، نويسنده , , Firouzeh and Gutman، نويسنده , , Ivan، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2010
Pages
4
From page
739
To page
742
Abstract
Let G be an n -vertex graph. If λ 1 , λ 2 , … , λ n and μ 1 , μ 2 , … , μ n are the ordinary (adjacency) eigenvalues and the Laplacian eigenvalues of G , respectively, then the Estrada index and the Laplacian Estrada index of G are defined as EE ( G ) = ∑ i = 1 n e λ i and LEE ( G ) = ∑ i = 1 n e μ i , respectively. Some new lower bounds for EE and LEE are obtained and shown to be the best possible.
Keywords
Spectrum (of graph) , Laplacian spectrum (of graph) , Laplacian Estrada index , Estrada index
Journal title
Applied Mathematics Letters
Serial Year
2010
Journal title
Applied Mathematics Letters
Record number
1526939
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