This bestselling undergraduate quantum mechanics textbook is now available in a re-issued affordable edition from Cambridge University Press The text first teaches students how to do quantum mechanics & then provides them with a more insightful discussion of what it means The author avoids the temptation to include every possible relevant topic instead presenting students with material that they can easily focus on in a complete treatment with few distractions & diversions Fundamental principles are covered quantum theory is presented & special techniques are developed for attacking realistic problems The innovative two-part coverage is entertaining & informative organizing topics under basic theory & assembling an arsenal of approximation schemes with illustrative applications linked closely to the text