Hello Everyone, I am an undergraduate physics student who planned to study quantum mechanics. I have been reading the introductory book by Griffiths, however I found that his book seldom uses Dirac Notation and there is little about mathematical formalism on quantum mechanics. Therefore I would like to get a supplementary book to enhance my understanding on quantum mechanics. I noticed that a number of students suggest the book by Zettili（Quantum mechanics concepts and applications），but on the other hand，Shankar's Book（Principles of quantum mechanics）is also popular。Therefore, I would like to ask which book would you prefer？Thank you！ P.S. Anyway，I would definitely get a copy of J.J Sakurai Modern Quantum Mechanics which is listed as reference by Professors，my major concern is that would there be any significant amount of overlapping materials or topics between any of the books above with that of J.J Sakurai, Thank you!