A clear and accessible presentation of quantum theory, suitable for researchers yet accessible to graduates.This book presents what is known as the consistent quantum theory approach to quantum mechanics at a level accessible to university students in physics, chemistry, mathematics, and computer science, and can be used as a supplement to standard textbooks. It provides a clear explanation of points not yet adequately treated in traditional texts and which students find confusing, as do their teachers. The book will also be of interest to physicists and philosophers working on the foundations of quantum mechanics.This book presents what is known as the consistent quantum theory approach to quantum mechanics at a level accessible to university students in physics, chemistry, mathematics, and computer science, and can be used as a supplement to standard textbooks. It provides a clear explanation of points not yet adequately treated in traditional texts and which students find confusing, as do their teachers. The book will also be of interest to physicists and philosophers working on the foundations of quantum mechanics.This volume elucidates the consistent quantum theory approach to quantum mechanics at a level accessible to university students in physics, chemistry, mathematics, and computer science, making this an ideal supplement to standard textbooks. Griffiths provides a clear explanation of points not yet adequately treated in traditional texts and which students find confusing, as do their teachers. The book will also be of interest to physicists and philosophers working on the foundations of quantum mechanics.1. Introduction; 2. Wave functions; 3. Linear algebra in Dirac notation; 4. Physical properties; 5. Probabilities and physical variables; 6. Composite systems and tensor products; 7. Unitary dynamics; 8. Stochastic histories; 9. The Born rule; 10. Consistent histories; 11. Checking consistency; 12. Examples of consistent families; 13. Quantum interferl³n