The 20 greatest equations

Physics Web is carrying out an interesting article in which the equations are rated by a group of people. Few of my favo(u)rites ohm's and kirchoff's are missing. Only consolation is maxwell's are rated at the top.

http://physicsweb.org/articles/world/17/10/2/1/pwpov2_10-04

Euler's are rated second. Obvious. Isn't it!

One of the quotes found in the slashdot discussion related to these ratings.

As they say, in maths things are usually named after Euler, or the first person to discover them after Euler.