The 11 Most Beautiful Mathematical Equations

[pokerfan]

6. My favorites

Pythagorean Theorem:

[center][/center]
Pythagorean theorem was listed in the OP article but that's one nifty geometric proof.

Maxwell's equations (classical electrodynamics):

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Once described all we knew about electromagnetics and it's still good enough for government work.

Quantum electrodynamics:

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Shout out to Richard Feynman!

Leibniz formula for Pi:

[center]?/4 = 1/1 - 1/3 + 1/5 - 1/7 + 1/9 - 1/11 + 1/13 - ...[/center]
It's about the slowest converging series ever but it gets bonus points for its simplicity.

Quadratic factorization:

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I memorized it in grade school and never forgot it.

And then there's this rather surprising one...

[center]e^? - ? = 20[/center]
Commonly used to test the accuracy of floating point operations on calculators.