Bounds for the energy of graphs

Year 2016, Volume: 45 Issue: 3, 695 - 703, 01.06.2016

Kinkar Ch. Das , İvan Gutman

Abstract

The energy of a graph G, denoted by E(G), is the sum of the absolute

values of all eigenvalues of G. In this paper we present some lower

and upper bounds for E(G) in terms of number of vertices, number

of edges, and determinant of the adjacency matrix. Our lower bound

is better than the classical McClelland’s lower bound. In addition,

Nordhaus–Gaddum type results for E(G) are established.

Keywords

Graph spectrum, energy (of graph), determinant of adjacency matrix

References

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