What is Ackerman function?Name one program which is done by this function?

Question

In any language ,you can tell me a name of program.

Answer 1

I think that Ackerman function is used to demonstrate computer math theorems. It isn't used in real world apps.

Answer 2

GOOGLE!!!

Answer 3

https://en.m.wikipedia.org/wiki/Ackermann_function

Answer 4

This should be about knowledge, not believing. Programming is math, not religion.