CENTROSYMMETRICITY IN GRAPHS AND THEIRENERGY

Let G be a graph on n vertices, and let 1; 2; :::; nbe the eigenvalues of a (0, 1)-adjacency matrix of G. The Energyof G is E =Pni=1 j ij. In this paper, we discuss about upper andlower bound of energy of some graphs by centrosymmetricity oftheir adjacency matrix.