Greatest Math Equations Ever (including 1+1=2)

A list of the world's 20 greatest math equations (Maxwell beats out Euler):

http://benvitalenum3ers.wordpress.com/2012/01/28/why-is-112-on-the-20-greatest-equation-list/

And in regards to Russell and Whitehead proving that 1+1=2 in Principia Mathematica, this: 




...actually, a more serious take on the Russell/Whitehead work here:

http://blog.plover.com/math/PM.html