This unique book, written by a leading Soviet theorist, is not a textbook of quantum mechanics but rather a compendium of the "tricks of the trade"-the methods that all practicing theoretical physicists use but few have set down in writing.

Read and cited by scientists worldwide, Advanced Book Classics are works that continue to inform today's groundbreaking research efforts. Redesigned and newly released in paperback, these graduate-level texts and monographs are now available to an even wider audience. Written by the most influential physicists of the twentieth century, these Advanced Book Classics promise to enrich and inspire a new generation of physicists.