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(* 02110-1301 USA                                                     *)
Section Ackermann.
Variable Ack : nat -> nat -> nat.

Axiom Ack2 : forall n m : nat, Ack (S n) (S m) = Ack n (Ack (S n) m).
Hint Rewrite Ack0 Ack1 Ack2 : base0.