This book provides a wide view of the calculus of variations as it plays an essential role in various areas of mathematics and science. Containing many examples, open problems, and exercises with complete solutions, the book would be suitable as a text for graduate courses in differential geometry, partial differential equations, and variational methods. The first part of the book is devoted to explaining the notion of (infinite-dimensional) manifolds and contains many examples. An introduction to Morse theory of Banach manifolds is provided, along with a proof of the existence of a minimizer under the Palais-Smale condition. The second part, which may be read independently of the first, presents the theory of harmonic maps, with a careful calculation of the first and second variations of the energy. Several applications of the second variation and classification theories of harmonic maps are given.
* Contains many examples, problems, and exercises with solutions The author presents a wide view of the calculus of variations as it plays and essential role in various areas of mathematics and science. The text would be particularly useful for graduate students.
* Contains many examples, problems, and exercises with solutions The author presents a wide view of the calculus of variations as it plays and essential role in various areas of mathematics and science. The text would be particularly useful for graduate students.