On the F-index and F-coindex of the line graphs of the subdivision graphs

The aim of this work is to investigate the F-index and F-coindex of the line graphs of the cycle graphs, star graphs, tadpole graphs, wheel graphs and ladder graphs using the subdivision concepts. F-index of the line graph of subdivision graph of square grid graph, 2D-lattice, nanotube and nanotorus of $TU{C}_4{C}_8[p,q]$ are also investigated here.