where m,n ≥ 0. Thus A(1,n) = n + 2 A(2,n) = 2n + 3 A(3,n) = 2n+3 – 3
The highly recursive nature of the function makes it a popular choice for testing the ability of compilers or computers to handle recursion. Named for W. Ackermann, it provides an example of a function that is general recursive but not primitive recursive because of the exceedingly rapid growth in its value as m increases.
The Ackermann function may also be regarded as a function Ack of a single variable: Ack(n) = A(n,n)
where A is defined as above.
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