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Exponent Crossed Power (Posted on 2009-03-18) Difficulty: 3 of 5
Determine all possible pair(s) (X, Y) of positive integers that satisfy this equation.


Note: The order of calculation in XXX is as given in this article.

No Solution Yet Submitted by K Sengupta    
Rating: 4.0000 (1 votes)

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re: Titration or Tetration ? | Comment 6 of 10 |
(In reply to Titration or Tetration ? by ed bottemiller)

The link does lead you to the Identities and properties section of the article, and without scrolling you find

Similarly, while addition and multiplication are associative (for example, (2+3)+4 = 9 = 2+(3+4) and (23)4 = 24 = 2(34), exponentiation is not associative either: 23 to the 4th power is 84 or 4096, but 2 to the 34 power is 281 or 2,417,851,639,229,258,349,412,352. Without parentheses to modify the order of calculation, the order is usually understood to be top-down, not bottom-up:

<DL> <DD><IMG class=tex alt="a^{b^c}=a^{(b^c)}ne (a^b)^c=a^{(bcdot c)}=a^{bcdot c}." src=""> </DD></DL>
  Posted by Charlie on 2009-03-18 15:54:16
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