A textbook for a three-semester or four-quarter graduate course introducing the principles of quantum mechanics and their application in various subfields of physics. Assumes a knowledge of the basic facts of atomic and subatomic physics, elementary quantum mechanics at the undergraduate level, classical mechanics, and electromagnetic theory. Explains non-relativistic quantum mechanics in the first two thirds, then delves into many-body theories, quantum electrodynamics, and relativistic particle theory. First published in 1961 and revised in 1970; the third edition has been substantially rewritten to account for the more thorough undergraduate preparation of physics students now. Annotation c. by Book News, Inc., Portland, Or.