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Review title: Concise, but very useful
Product review: Most mathematical physics textbooks are huge tomes (Arfken), multiple volume sets (Courant and Hilbert), or both (Morse and Feshbach). This book covers the essentials in a reader-friendly way without pages and pages of exposition. The discussion of integral equations with separable kernels is a perfect example, rather than going on and on with the theory, Mathews and Walker just give an example that illustrates the technique; this approach makes it easier to follow than the rest. The book was originally based on lectures by Feynman, and his mark is apparent on it. If you just want to see how to solve problems and aren't interested in long-winded discussions of the range of applicability of a technique, this is your book.
