Thesis. M.S. American University of Beirut. Department of Mathematics, 2018. T:6759$Advisor : Prof. Bertrand Florian, Assistant Professor, Mathematics ; Committee members : Prof: Abi Khuzam Farouk, Professor, Mathematics ; Prof: Tlas Tamer; Associate Professor, Mathematics ; Prof: Della Sala Giuseppe; Assistant Professor, Mathematics.
Includes bibliographical references (leaf 30)