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From: Joe Corneli <jcorneli@math.utexas.edu>
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Subject: bigger integers
Date: Thu, 02 Sep 2004 17:28:17 -0500
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This fails on big numbers like 12.

 (defun factorial (num)
   (if (<= num 0)
       1
     (* num (factorial (1- num)))))

Suggestions on how to make it work for bigger numbers?