Functional analysis Sobolev spaces and partial differential equations Uniquely this book presents a coherent concise and unified way of combining elements from two distinct worlds functional analysis (FA) and partial differential equations (PDEs) and is intended for students who have a good background in real analysis. This text presents a smooth transition from FA to PDEs by analyzing in great detail the simple case of one dimensional PDEs (i.e. ODEs) a more manageable approach for the beginner. Although there are many books on functional analysis and many on PDEs this is the first to cover both of these closely connected topics. Moreover the wealth of exercises and additional material presented leads the reader to the frontier of research The first part of the text deals with abstract results in FA and operator theory. The second part is concerned with the study of spaces of functions (of one or more real variables) having specific differentiability properties e.g. the celebrated Sobolev spaces which lie at the heart of the modern theory of PDEs. The Sobolev spaces occur in a wide range of questions both in pure and applied mathematics appearing in linear and nonlinear PDEs which arise for example in differential geometry harmonic analysis engineering mechanics physics etc. and belong in the toolbox of any graduate student studying analysis This book has its roots in a celebrated course taught by the author for many years and is a completely revised updated and expanded English edition of die important Analyse Fonctionnelle (1983). Since the French book was first published it has been translated into Spanish Italian Japanese Korean Romanian Greek and Chinese. The English version is a welcome addition to this list