About the Randi? Connectivity, Modify Randi? Connectivity and Sum-connectivity Indices of Titania Nanotubes TiO2(m,n)

摘要

The Randi? Connectivity Index R(G) is one of the oldest connectivity index, introduced by Randi? in 1975. Another connectivity indices is the Sum-Connectivity Index X(G) introduced in 2008 by Zhou and Trinajsti?. Recently in 2011, a modification of the Randi? Connectivity Index of a graph G was introduced by Dvorak et al. In this paper, we compute these connectivity topological indices for a family of molecular graphs known as titania nanotubes TiO 2 ( m,n ).