DERP

(define (A x y)
(cond ((= y 0) 0)
((= x 0) (* 2 y))
((= y 1) 2)
(else (A (- x 1)
(A x (- y 1))))))
I understand everything up until the else.
HALP.

In the event you reach the else case, [code](A x (- y 1))[/code will be called and its return value is used as the second argument in the other recursive call. What's there to understand? Is it that you want to know the purpose of the function?