ARTICLE | doi:10.20944/preprints202012.0818.v1
Subject: Environmental And Earth Sciences, Atmospheric Science And Meteorology Keywords: Eigenvalue of graph; Estrada index; Randic Estrada index; Bounds
Online: 31 December 2020 (14:22:21 CET)
Let G be a graph with n vertices and let 1; 2; : : : ; n be the eigenvalues of Randic matrix. The Randic Estrada index of G is REE(G) = Ón i=1 ei . In this paper, we establish lower and upper bounds for Randic index in terms of graph invariants such as the number of vertices and eigenvalues of graphs and improve some previously published lower bounds.