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| | Tetration - Wikipedia, the free encyclopedia |
 | | Tetration (also exponential map, hyperpower, power tower, super-exponentiation, and hyper4) is iterated exponentiation, the first hyper operator after exponentiation. |
 | | I.N. Galidakis, On extending hyper4 to nonintegers (undated, 2006 or earlier) (A simpler, easier to read review of the next reference) |
 | | Robert Munafo, Extension of the hyper4 function to reals (An informal discussion about extending tetration to the real numbers.) |
| en.wikipedia.org /wiki/Super-exponentiation (1046 words) |
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