Muaadh Mohammed Abdullah AL-Mahalebi received the Ph.D. degree in Functional Analysis, Science College from Ibn Tofail University, Morocco and received the M.Sc degree in Mathematical Analysis and Information Processing, Science College from Ibn Tofail University, Morocco. Experience : Lecturer, Department of mathematics, College of Science, Ibn Tofail University, Morocco. Teaching assistant, Department of Computer Sciences, The National University - Taiz, Yemen. Teaching assistant, Department of Computer Sciences, University of Science and Technology, Taiz branch, Yemen. Teaching assistant, Department of mathematics, College of Sciences, Taiz University, Yemen