``Aufgabe VI.47 of Polya-Szego Immediately Implies Dave Robbins's
Multi-Integral Evaluation''
by D.Zeilberger
(Exclusive for the Personal Journal of Shalosh B. Ekhad and
Doron Zeilberger, and the xxx archives.)
Polya-Szego has many other interesting `excercises'.
Look them up!
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