Here's a reading recommendation list I put together over the years: http://math.mit.edu/~notzeb/rec.html http://math.mit.edu/~notzeb/rec.html Two caveats: firs

Here's a reading recommendation list I put together over the years: http://math.mit.edu/~notzeb/rec.html http://math.mit.edu/~notzeb/rec.html Two caveats: first, it is obviously biased to the sort of math I find enjoyable, and second, many of the suggestions require the reader to have that elusive quality called "mathematical maturity". (I have no idea how one goes about gaining mathematical maturity, despite having gone through this process myself.)