Geodesic
Lower Bounds for Estrada Index
Publications de l'Institut Mathématique, _N_S_83 (2008) no. 97, p. 1

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If $G$ is an $(n,m)$-graph whose spectrum consists of the numbers $\lambda_1,\lambda_2,\ldots,\lambda_n$, then its Estrada index is $\operatname{EE}(G)=\sum_{i=1}^n e^{\lambda_i}$. We establish lower bounds for $\operatorname{EE}(G)$ in terms of $n$ and $m$.
DOI : 10.2298/PIM0897001G
Classification : 05C50 05C35 
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     title = {Lower {Bounds} for {Estrada} {Index}},
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Ivan Gutman. Lower Bounds for Estrada Index. Publications de l'Institut Mathématique, _N_S_83 (2008) no. 97, p. 1 . doi: 10.2298/PIM0897001G

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