1. 1 Department of Mathematics, College of Science and Arts of Gurayyat , Jouf University , Gurayyat , Kingdom of Saudi Arabia
2. 2 Department of Mathematics, Faculty of Science and Technology , Shendi University , Shendi , Sudan
3. 3 Department of Mathematics, Faculty of Science , Mansoura University , Mansoura , , Egypt
4. 4 Department of Mathematics , Taif University Faculty of Science , Kingdom of Saudi Arabia
5. 5 Department of Mathematics, Faculty of Science , South Valley University , Qena , Egypt