1. Department of Mathematics, Al-Aflaj College of Science and Humanities, Prince Sattam bin Abdulaziz University, Al-Aflaj, Saudi Arabia
2. Department of Mathematics, Suez Faculty of Science, Suez University, Suez, Egypt
3. Math. Depart, Faculty of Science, Taif University, Taif, Saudi Arabia
4. Department of Mathematics, Al_mukhwa College of science and Art, Al-Baha University, Al_mukhwa, Saudi Arabia