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Alex Rivera
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I define a function in LISP, and it defines correctly. But whenever I try to call it, I get an error saying "The variable FACTORIAL is unbound." I have tried this on both OS X and Windows 7, on LispWorks and Allegro. The function is - (defun factorial (x) (if (= 1 x) 1 (* x factorial (- 1 x)))) Any help is appreciated.
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