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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Ackermann-function/Coq/ackermann-function-2.coq Normal file
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Require Import Utf8.
Section FOLD.
Context {A : Type} (f : A → A) (a : A).
Fixpoint fold (n : nat) : A :=
match n with
| O => a
| S k => f (fold k)
end.
End FOLD.
Definition ackermann : nat → nat → nat :=
fold (λ g, fold g (g (S O))) S.