What does the sign up arrow in maths means?
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In mathematics, Knuth's up-arrow notation is a method of notation for very large integers, introduced by Donald Knuth in 1976.
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It really means nothing in mathematics. From a distance it resembles the upward pointing arrow, so from early days on in computer based texts it was used as symbol for exponentiation. ... The correct mathematical notation for exponentiation is still and not A^b.
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