Journal
ELECTRONIC JOURNAL OF LINEAR ALGEBRA
Volume 23, Issue -, Pages 664-668Publisher
INT LINEAR ALGEBRA SOC
DOI: 10.13001/1081-3810.1549
Keywords
Estrada index; Lower bound; Graph spectrum; Zagreb index
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Let G be a graph with n vertices and gimel(1), gimel(2), ... , gimel(n) be its eigenvalues. The Estrada index of G is defined as EE(G) - Sigma(n)(i)(=1) e(gimel i). In this paper, new lower bounds for the Estrada index are established.
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