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 $TUC_{4}C_{8}[p, q]$ are also investigated here. 
Ruhul Amin and Sk. Md. Abu Nayeem
math.CO cs.DM