HI I'm currently a junior undergraduate, with a relatively weak background in mathematics. I've done linear algebra, differential equations, and up to multivariable calculus. But no statistics, discrete mathematics, analysis, geometry etc. Usually when I begin to explore a new field (or world, in this case), I find it very helpful to read seminal works with strong historical impact. I was wondering if anyone could recommend to me some important books or papers that might be accessible to someone of my limited background. For example, I read Neumann's Theory of Self-Reproducing Automata, and loved what I understood, which I actually felt like was a good deal. The time period does not particularly matter, and I'm really just looking to become better at reading mathematics and developing a strong intuition for the subject. So maybe Euler or Euclid would be good to read. I realize this is probably too-broad a request, but I really am open to reading from any area of mathematics, but simply don't know what to begin with. If anyone could recommend 3 or 4 of their favorite works, which are also accessible, I would appreciate it a lot. (I emailed my professor with the same question, and he didn't even reply..lol). thanks!