On some leap indices of Polycyclic Aromatic Hydrocarbons (PAHs)

Abstract

Graph invariants are numerical values assigned to some molecular graph G_M to characterize its topological properties. The second neighbourhood or a 2 –distance degree of any vertex v in a graph G_M is the cardinality of its second neighbors. In this research article, we formulated some expressions for the leap Zagreb indices, leap hyper-indices and F – leap indices, depending on the second degree of a vertex, of a family of a molecular graph called Polycyclic Aromatic Hydrocarbons PAH_s.

Subject Classification:

• 05C07
• 05C35
• 05C40

Keywords:

• Leap Zagreb indices
• Leap hyper-Zagreb indices
• F –leap indices
• Polycyclic Aromatic Hydrocarbons PAH_n
• second degree