Jonnathan Rodr'iguez

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math.SP2019

Some New Lower Bounds for the Estrada Index

Juan L. Aguayo, Juan R. Carmona, Jonnathan Rodríguez

Let $G$ be a graph on $n$ vertices and $λ_{1}, λ_{2}, \dots, λ_{n}$ its eigenvalues. The Estrada index of $G$ is an invariant that is calculated from the eigenvalues of the adjacency matri…

math.SP2018

Lower bounds for Laplacian spread and relations with invariant parameters revisited

Enide Andrade, Maria Aguieiras A. de Freitas, María Robbiano +1

Let $G = (V (G), E (G))$ be an $(n, m)$ -graph and $X$ a nonempty proper subset of $V (G)$ . Let $X^{c}=V\left( G\right) \ba…