The definition 1 is from Introduction to Algorithm and the second is from wikipedia.
](https://i.stack.imgur.com/mM2DJ.png)
2026-03-25 19:02:14.1774465334
What's the relation between these two definition of Ackermann function?
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The second form is equivalent to formular
if we let the first definiction be A and the second one be \bar{A}, then we have
Proof：
since
then
so
This is the only relationshift I can find.