Salah Hamd
(1)
, Faisal Abdalla
(2)
, Ahmed Shletiet
(3)
(1)
Department of Mathematics, Faculty of Education, Omar Al-Mukhtar University, Al-Bayda, Libya,
(2)
Department of General Science, Faculty of Mechanical Engineering Technology, Benghazi University, Benghazi, Libya,
(3)
Department of Mathematics, Faculty of Science, University of Ajdabiya, Ajdabiya, Libya