On energy of line graphs.

The energy E ( G ) of a simple graph G is the sum of absolute values of the eigenvalues of its adjacency matrix. The line graph of G is denoted by L G . We obtain a relation between E ( L G ) and E ( G ) , and establish bounds on E ( L G ) . Moreover, we present results pertaining to equienergetic and hyperenergetic graphs. [ABSTRACT FROM AUTHOR]