Document Type : Research Paper
Mahallat Branch, Islamic Azad University, Iran
Arak University, Iran
Shahid Rajaee Teacher Training University, I. R. Iran
The atom-bond connectivity index of graph is a topological index proposed by Estrada et al. as ABC (G) uvE (G ) (du dv 2) / dudv , where the summation goes over all edges of G, du and dv are the degrees of the terminal vertices u and v of edge uv. In the present paper, some upper bounds for the second type of atom-bond connectivity index are computed.