Faisal Abdalla
(1)
, Ahmed Elsakori
(2)
, Hafed Saleh
(3)
(1)
Department of Mathematics , The Libyan Academy-Benghazi, Benghazi, Libya,
(2)
Department of Mathematics, Faculty of Arts and Sciences-Al marj, University of Benghazi, Benghazi, Libya,
(3)
Department of Mathematics, College of Electrical and Electronics Technology, Libya
