Tetration

In mathematics, tetration (or hyper-4) is the next hyperoperation after exponentiation, and is defined as iterated exponentiation. The word was coined by Reuben Louis Goodstein, from tetra- (four) and iteration. Tetration is used for the notation of very large numbers. Shown here are the first four hyperoperations, with tetration as the fourth (and succession, the unary operation denoted $a' = a + 1$ taking $a$ and yielding the number after $a$ , as the 0th):

单词	Tetrate
释义	Tetrate 英语百科 Tetration In mathematics, tetration (or hyper-4) is the next hyperoperation after exponentiation, and is defined as iterated exponentiation. The word was coined by Reuben Louis Goodstein, from tetra- (four) and iteration. Tetration is used for the notation of very large numbers. Shown here are the first four hyperoperations, with tetration as the fourth (and succession, the unary operation denoted $a' = a + 1$ taking $a$ and yielding the number after $a$ , as the 0th):
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Tetrate

Tetration