Comment on four papers of Elsayed M.E. Zayed, Abdul-Ghani Al-Nowehy, Reham M.A. Shohib and Khaled A.E. Alurrfi (Optik 130 (2017) 1295–1311 & Optik 143 (2017) 84–103 & Optik 158 (2018) 970–984 & Optik 144 (2017) 132–148)

The comment concentrate on the solutions of mapping method that included in the above two papers. We prove by simple calculation and also by using computer software (Maple program V. 16) that this technique for solving nonlinear partial differential equation (PDE) is wrong.