most recent 30 from http://mathoverflow.net 2013-05-21T07:29:35Z http://mathoverflow.net/feeds/user/539 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/8825/how-many-different-representations-of-pi-can-we-come-up-with Alex Basson 2009-12-14T02:13:05Z 2010-08-29T06:07:09Z

<p>Let me explain: a friend of a friend is opening a new pizza restaurant called "Pi", and he's looking to decorate his walls with pi-related material: formulas, equations, theorems w/ proof, diagrams, etc. Any suggestion is welcome, so long as it meets these two criteria:</p> <ol> <li>It has to be mathematically correct.</li> <li>It has to be either a representation of pi itself or lead directly to a representation of pi.</li> </ol> <p>So for example, this is okay: $\sum_{n=1}^{\infty} \frac{1}{n^2}$ (because it equals $\frac{\pi^2}{6}$)<br /> But this is not: $\frac{22}{7}$.</p> <p>How many can we come up with?</p>

http://mathoverflow.net/questions/879/most-interesting-mathematics-mistake/901#901 Alex Basson 2009-10-17T17:48:33Z 2009-10-17T17:48:33Z

<p>All of the (in retrospect) misguided attempts to prove Euclid's Parallel Postulate, which eventually lead Gauss to develop hyperbolic geometry.</p>