A dimensional proof of Pythagoras' thm

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I found this beauty and just had to post it here. It is on the second page of the following link:

http://www.physics.smu.edu/~olness/cteqpp/DimReg.5.pdf

The rest of the file has to do with dimensional regularization, so you will need some more background to understand what is going on, but it is worth looking at also.
 
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Neat stuff !
 

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