This 1985 text develops the theory of angular momentum from the viewpoint of a fundamental symmetry in nature.This 1985 text develops the theory of angular momentum from the viewpoint of a fundamental symmetry in nature and shows how this concept relates to applied areas of research in modern quantum physics.This 1985 text develops the theory of angular momentum from the viewpoint of a fundamental symmetry in nature and shows how this concept relates to applied areas of research in modern quantum physics.This 1985 text develops the theory of angular momentum from the viewpoint of a fundamental symmetry in nature and shows how this concept relates to applied areas of research in modern quantum physics.1. Introduction; 2. The kinematics of rotations; 3. Standard treatment of angular momentum in quantum mechanics; 4. The theory of turns adapted from Hamilton; 5. The Boson Calculus applied to the theory of turns; 6. Orbital angular momentum and angular functions on the sphere; 7. Some applications to physical problems.Review of the hardback: '& a comprehensive treatment of angular momentum theory and some of its application to physical problems. In addition to the standard theory, it includes much that is new'. American Mathematical Monthly