The F-index and F-coindex of four operations on Trees

Abstract

For a (molecular) graph G, the forgotten topological index is equal to the sum of cubes of the degrees of vertices of G and the forgotten topological coindex is defined as the sum of squares of a graph’s vertex degree which is not adjacent. In this paper, we obtain the forgotten topological index and forgotten topological coindex of four operations on Trees.

Subject Classification:

• 05C05
• 05C09
• 05C76

Keywords:

• Tree
• F–index
• F–sum
• F-coindex
• Operation on graphs