If you already have an understanding behind both the history and the theory of QM and you want to explore the subject a little deeper, this is the book for you. It is not an introductory book on the subject nor is it a textbook-level  graduate course in QM.  In his introduction, the author is clear than some knowledge of calculus and linear algebra is required in order to more FULLY understand the concepts laid out in the book. Since I have had 3 semesters of calculus in addition to a semester of differential equations and linear algebra, I found the math fairly easy to follow. I will agree with a previous reviewer who commented that at times, the author tended to gloss over explanations of certain topics.<br>For this reason, I suggest that you refer to other sources in order to get a clearer understanding of the topics that are not clear to you. Otherwise, this book is well done.It's not quite a text book on QM, but it's a great "intermediate" one that bridges the many non-mathematical, introductory books on the subject and a university-level textbook.