There was a thread on Quora recently asking what the most beautiful equation was http://www.quora.com/Mathematics/What-is-the-most-beautiful-equation http://www

There was a thread on Quora recently asking what the most beautiful equation was http://www.quora.com/Mathematics/What-is-the-most-beautiful-equation http://www.quora.com/Mathematics/What-is-the-most-beautiful-..., which while it is obviously the Einstein field equations was nice to read through in a similar vein.