On maximum signless Laplacian Estrada index of graphs with given parameters II

Ramin Nasiri, Hamid Reza Ellahi, Gholam Hossein Fath-Tabar, Ahmad Gholami

Abstract


The signless Laplacian Estrada index of a graph $G$ is defined as $SLEE(G)=\sum^{n}_{i=1}e^{q_i}$ where $q_1, q_2, \ldots, q_n$ are the eigenvalues of the signless Laplacian matrix of G.  Following the previous work in which we have identified the unique graphs with maximum signless Laplacian Estrada index with each of the given parameters, namely, number of cut edges,  pendent vertices, (vertex) connectivity, and edge connectivity, in this paper we continue our characterization for two further parameters: diameter and number of cut vertices.


Keywords


Estrada index, signless Laplacian Estrada index, extremal graph, diameter, cut vertex

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DOI: http://dx.doi.org/10.5614/ejgta.2018.6.1.14

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