Juan L. Aguayo

collaborators

2 papers

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

New lower bounds for the Estrada and Signless Laplacian Estrada Index of a Graph

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 defined as $E E (G) = \sum_{i = 1}^{n} e^{λ_{i}} .$ In this work, using a different de…