Abstract
In Bagga et al. (1995) the authors introduced the concept of the super line graph of index r of a graph G, denoted by L r(G) . The vertices of L r(G) are the r-subsets of E( G) and two vertices S and T are adjacent if there exist s∈ S and t∈ T such that s and t are adjacent edges in G. In this paper, some properties of super line graphs of index 2 are presented, and L 2(G) is studied for certain classes of graphs.
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