I've been meaning for a long time to point out that there are some good math texts out there for free download. So, if you can learn by just reading a book or by asking questions on here, and have been wanting to learn calculus or some more advanced math and don't want to pay $70 for a textbook you don't even know you want... there are several sites, but Mr. Cain does a fine job of listing a bunch. And, there's always google scholar... then you just can't keep them.
http://www.math.gatech.edu/~cain/textbo ... books.html
Generatingfunctionology: Likely the most popular free download, Herbert Wilf explains the theory of generating functions, which makes sequences much easier. Highly recommended.
http://www.math.gatech.edu/~cain/textbo ... books.html
GA Tech: About 65 different downloads. I guess I would recommend graph theory, number theory, complex analysis, and probability stuffs.
Hope somebody finds these as exciting as I did. I have about 1 GB of math PDFs that took much effort. Am thinking about downloading all hundred years of the American Mathematical Monthly from JSTOR, which is an appreciable part of a million PDFs. I think a subscription is several thousand dollars a year. lol, how nerdy.
-Aaron