الفهرس 
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Abstract
The main objective of this thesis is the development of basic theoretical results as well as methodology for solving multi objective programming with fuzzy parameters, these parameters are characterized as the fuzzy numbers. The thesis contains five chapters. Chapter 1: gives a survey of the multi criteria decision making. It covers the different classification of the multi criteria models. It also summarizes the most essential theoretical results for the linear fractional problems. Chapter 2: In this Chapter some concepts and aspects of the fuzzy nonlinear problems are discussed. A numerical example is included. Chapter 3: An algorithm for generalized fuzzy fractional programming based on parametric optimization is introduced. Chapter 4: A fuzzy set theory is applied to a model for cancer radiotherapy and a model for cancer chemotherapy. Chapter 5: Contains the conclusion of the work and points for further research.