Links

Here are some links, helpful or otherwise:

Math Links

• arXiv.org - The latest and greatest preprints from math, physics, and computer science.
• Khan Academy - Hundreds of free videos on many topics including most 200 and 300 level math classes.
• Paul's Online Math Notes - Great notes for calculus I-IV, linear algebra and differential equations.
• Planet Math - A fairly comprehensive mathematics encyclopedia.
• Wolfram Alpha - Better than your TI-89!  Can evaluate integrals, invert matrices and more!

Diversions

• Brown Sharpie - Mathematics cartoons.
• Free Tetris - Who doesn't love Tetris?
• xkcd - Wonderful comics which even occasionally contain math humor.