Thesis. M.S. American University of Beirut. Department of Mathematics, 2018. T:6770$Advisor : Prof. Bertrand Florian, Assistant Professor, Mathematics ; Committee members : Prof. Abi Khuzam Farouk, Professor, Mathematics ; Prof. Shayya Bassam, Professor, Mathematics ; Prof. Della Sala Giuseppe; Assistant Professor, Mathematics.
Includes bibliographical references (leaf 58)