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<p>This graduate textbook provides a self-contained introduction to the classical theory of partial differential equations (PDEs). Through its careful selection of topics and engaging tone, readers will also learn how PDEs connect to cutting-edge research and the modeling of physical phenomena. The scope of the Third Edition greatly expands on that of the previous editions by including five new chapters covering additional PDE topics relevant for current areas of active research. This includes coverage of linear parabolic equations with measurable coefficients, parabolic DeGiorgi classes, Navier-Stokes equations, and more. The "Problems and Complements" sections have also been updated to feature new exercises, examples, and hints toward solutions, making this a timely resource for students.</p><i>Partial Differential Equations: Third Edition</i> is ideal for graduate students interested in exploring the theory of PDEs and how they connect to contemporary research. It can alsoserve as a useful tool for more experienced readers who are looking for a comprehensive reference.<p></p><p></p><p></p>