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• 1- Mathematics Department, Faculty of Science, Minia University, Minia, Egypt.
• 2- Al-Azhar University, Faculty of Science, Mathematics Department, Nasr City, 11884, Cairo, Egypt.
• 3- King Abdul Aziz University, Faculty of Science, Department of Mathematics, PO Box 80203, Jeddah, 21589, Saudi Arabia.
• E-mail address: elsabbaghmostafa@yahoo.com and atali71@yahoo.com