1. Department of Mathematics, Faculty of Science, Cairo University, Giza 12613, Egypt
2. Department of Mathematics, College of Science, University of Jeddah, Jeddah 23218, Saudi Arabia
3. Department of Basic Sciences, Adham University College, Umm AL-Qura University, Makkah 28653, Saudi Arabia
4. Department of Mathematics, Faculty of Technology and Education, Helwan University, Cairo 12612, Egypt