A Note on $\lambda_2$ and $\lambda_n2$ of a Graph
Mathematica Moravica, Tome 8 (2004) no. 1.

Voir la notice de l'article dans eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

Using the eigenvalues and eigenvectors of a graph G, it was established the upper bound for the second eigenvalue $\lambda_2$ and the least eigenvalue $\lambda_n2$ [1]. In this work using only the eigenvalues of G we obtain the upper bound for $\lambda_2$ and $\lambda_n$.
Mots-clés : geometric inequalities, fundamental inequalities of triangle, Gerretsen’s inequalities 
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Mirjana Lazić. A Note on $\lambda_2$ and $\lambda_n2$ of a Graph. Mathematica Moravica, Tome 8 (2004) no. 1. https://geodesic-test.mathdoc.fr/item/MM3_2004_8_1_a2/