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The aim of this book is to present new series approximation methods for solving linear and nonlinear differential equations which arising in applied Sciences. These procedures applied on fluid dynamics problems, population model equations, oscillator problems, fractional order equation, batch reactor equation and the Riccati´s differential equations. It is interesting to note that these methods give the analytic and numerical results.

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Najeeb Alam Khan obtained his Ph. D in Mathematics University of Karachi, Karachi. He is currently assistant Professor in the Mathematics, University of Karachi. He has published 70 articles in international Journals. He is an Editor of International Journal of Modern Mathematical Sciences and referee of 41 International Journals.

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