"I think it is said that Gauss had ten different proofs for the law of quadratic reciprocity. Any good theorem should have several proofs, the more the better. For two reasons: usually, different proofs have different strengths and weaknesses, and they generalize in different directions—they are not just repetitions of each other. " Sir Michael Atiyah
read the full article at: http://rjlipton.wordpress.com/2010/08/18/proofs-proofs-who-needs-proofs/
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