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This book discusses recent developments in and contemporary§research on summability theory, including general summability methods, direct§theorems on summability, absolute and strong summability, special methods of§summability, functional analytic methods in summability, and related topics and§applications. All contributing authors are eminent scientists, researchers and§scholars in their respective fields, and hail from around the world. The book§can be used as a textbook for graduate and senior undergraduate students, and§as a valuable reference guide for researchers and practitioners in the fields§of summability theory and functional analysis.§§Summability theory is generally used in analysis and applied§mathematics. It plays an important part in the engineering sciences, and§various aspects of the theory have long since been studied by researchers all§over the world.§