RosettaCodeData/Task/Y-combinator/PicoLisp/y-combinator-4.l

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2023-07-01 11:58:00 -04:00
# Ackermann
(de ack (F)
(curry (F) (X Y)
(cond
((=0 X) (inc Y))
((=0 Y) (F (dec X) 1))
(T (F (dec X) (F X (dec Y)))) ) ) )
: ((Y ack) 3 4)
-> 125