Advanced undergraduates and graduate students studying quantum mechanics will find this text a valuable guide to mathematical methods. Emphasizing the unity of a variety of different techniques, it is enduringly relevant to many physical systems outside the domain of quantum theory.Concise in its presentation, this text covers eigenvalue problems in classical physics, orthogonal functions and expansions, the Sturm-Liouville theory and linear operators on functions, and linear vector spaces. Appendixes offer useful information on Bessel functions and Legendre functions and spherical harmonics. This introductory text's teachings offer a solid foundation to students beginning a serious study of quantum mechanics.
Great supplementary book if you are curious about inner workings of math in quantum mechanics. I have started studying undergrad quantum mechanics before reading this book and matching the concepts in this book to physics was fun! The book does not hold your hand by explaining to you which one of those concepts in quantum mechanics applies here, at least at the beginning and that makes it much more fun to explore in my opinion. Problems are pretty balanced with regards to how difficult they are.