The main unique feature of Nonrelativistic Quantum Mechanics is its discussion of Hilbert space and rigged Hilbert space. This invaluable book is suitable for advanced undergraduate students as well as graduate students.
This is by far and away the most comprehensible text on quantum mechanics that I've found yet. This book may very well be the only thing preventing me from failing quantum mechanics (note: this is not the required text for the class).
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