1. Department of Mathematics, Faculty of Science King Abdulaziz University Jeddah Saudi Arabia
2. Department of Mathematics, Faculty of Science Beni‐Suef University Beni‐Suef Egypt
3. Department of Mathematics, Faculty of Science Cairo University Giza Egypt
4. Department of Mathematics and Computer Sciences Cankaya University Ankara Turkey
5. Institute of Space Sciences, Magurele‐Bucharest R 76900 Romania
6. Department of Basic Science Institute of Information Technology, Modern Academy Cairo Egypt