By Doron Zeilberger
(Exclusively published in the Personal Journal of Shalosh B. Ekhad and Doron Zeilberger)
Written: March 25, 2009.
The shortest proof is not always the prettiest. While the present proof is (probably) shorter than the original proof, and definitely shorter than Moti Novick's recent proof, it is definitely less elegant than Novick's proof.
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