Card Table Proof of the Pythagorean Theorem

We own a standard card table that we leave tucked away in the basement until the kids want to have a lemonade stand on the front sidewalk or we need the extra table space for a large Thanksgiving dinner. It is the standard kind with legs that fold underneath it so it is easy to store….

Highlights from MathFest 2011

Last weekend I was in Lexingon, Kentucky for MathFest 2011. I had a very nice time and saw some very good talks. I thought, just for fun, that I’d share a couple of juicy mathematical tidbits I learned. Fibonacci numbers and the golden ratio Ed Burger of Williams College gave a talk entitled “Planting your…

What is wrong with this picture?

This image illustrating the Pythagorean Theorem was created by the artist Mel Bochner. It appears on the cover of the January 2009 issue of the College Mathematics Journal. What is wrong with it? For the answer, visit the 360 blog.