| Definitions | | tetration |
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noun - (arithmetic) The arithmetic operator consisting of repeated exponentiation, by analogy with exponentiation being repeated multiplication and multiplication being repeated addition, ba denoting a to the power of a to the power of ... to the power of a, in which a appears b times. Notation: ba, <math>a\uparrow\uparrow b</math> or'' <math>a\rightarrow b\rightarrow 2</math>
Etymology: tetra- + iteration, (itera)tion; coined by TetrationGoodstein?, Reuben Louis Goodstein
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