1. Mathematics Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
2. Mathematics Department, Faculty of Science, Umm Al-Qura University, Makkah 21955, Saudi Arabia
3. Simon A. Levin Mathematical, Computational and Modeling Sciences Center, Arizona State University, Tempe, AZ 85287, USA
4. Department of Mathematics, California State University, Fullerton, CA 92831, USA
5. Division of Mathematics, Natural and Health Sciences, University of Hawaii—West Oahu, Kapolei, HI 96707, USA
6. School of Human Evolution and Social Change, Arizona State University, Tempe, AZ 85281, USA