This is another concise and clearly written book by Professor Susskind and a ‘student’ collaborator. This book, as was The Theoretical Minimum, is based on (video) lectures given by Professor Susskind at Stanford.<br><br>The book goes through the mathematical under-pinnings (linear algebra and linear operators). The mathematical concepts are related to the physics through examples starting with spin. The importance of Hermitian matrices, Unitary matrices, commutator relations  and the relation to classical mechanics are explored clearly.  The book explores what generalized uncertainty is, what entanglement is and is not. It deals with the areas of confusion in a pragmatic way.<br><br>I think this book is a  useful accompaniment of the video lectures and book by Professor Binney.<br><br>I look forward to more Susskind books.