8 lines
163 B
Text
8 lines
163 B
Text
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(define (Δ-1 list)
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(for/list ([x (cdr list)] [y list]) (- x y)))
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(define (Δ-n n) (iterate Δ-1 n))
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((Δ-n 9) '(90 47 58 29 22 32 55 5 55 73))
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→ (-2921)
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