The Ackermann ordinal is a concept from set theory and ordinal numbers, named after the German mathematician Wilhelm Ackermann. It refers specifically to a particular ordinal number that arises in the context of recursive functions and the study of ordinals in relation to their growth rates. The Ackermann function is a classic example of a total recursive function that grows extremely quickly, and it is often used in theoretical computer science to illustrate concepts related to computability and computational complexity.
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