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Ackermann's function, as given in SICP.
(define (A x y)
(cond ((= y 0) 0)
((= x 0) (* 2 y))
((= y 1) 2)
(else (A (- x 1)
(A x (- y 1))))))

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enigmaticape commented Nov 16, 2012

Ackermann's function, from discussion of solution to Exercise 1.10 of Structure and Interpretation Of Computer Programs, from the Enigmatic Ape blog at

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