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Abstract Preface Dierential equations are important and essential tools for modeling many biological, engineering and industrial applications. Moreover, fractional calculus become a vital tool in describing these applications. In many cases, these fractional order models simulate the given problem eciently than those of integer order models. The analytic solutions of most fractional dierential equations generally can’t be obtained. As a consequence, approximate and numerical methods play an important role in identifying the solution of such fractional equations and exploring their applications. The main objective of this thesis is to apply some approximate analytic techniques for solving some fractional models. This thesis consists of four chapters organized as follows: Chapter 1: presents basic concepts and results of some properties of ordinary dierential equations such as existence, uniqueness of solutions and a brief discussion on the stability conditions for the linear and non-linear ordinary dierential equations. In addition, a historical survey on the fractional calculus and some basic denitions and vii |