I know a fair amount of theoretical Quantum Physics, how things work within it, and the ideas that ground it. I lack, though, the more advanced mathematics. Right now I'm taking an Engineering course, and last year I studied a little bit of Quantum Physics, but the calculations were limited to one-dimensional applications of the Schrödinger Equation and such. I have the Feynman Lectures on Physics, but I do not believe they ever get far enough into the theories (I haven't finished reading even the first one yet, due to lack of time caused by school) for it to be truly interesting. So what I'm looking for is a recommendation of one or more books about Quantum Theory (and I want math in it) that cover a large part of it, the more the merrier. I am pretty confident I can handle most of the more advanced math in the theory, as long as I have a build-up of knowledge before that to give me some basis (i.e. a book that starts Chapter 1 talking about entanglement, decoherence and making three-dimensional time-independent calculations is not exactly what I'm looking for). I would like to thank you in advance for your help.