September 28, 2008
2^2=4
PlayMath question. What is this operation called?
Computer scientis write it like this 
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Answer:
Tetration or Knuth’s Up Arrow notation.
a^^b = (a^(a^(a.. b times)))
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this->bb();
September 28th, 2008 at 11:03 pm, GMT +0000 ( 1222643002 )
Ackerman Function – Knuth\’s up-arrow notation
September 28th, 2008 at 11:17 pm, GMT +0000 ( 1222643877 )
Rudy Rucker’s Infinity and Mind says a lot about this notation called Tetration,an iterated exponential.
Iterating a to power of a b times,we get this tetration.
Donald Knuth’s up-arrow notation is shown in the second.
September 29th, 2008 at 12:27 am, GMT +0000 ( 1222648054 )
Tetration
September 29th, 2008 at 12:45 am, GMT +0000 ( 1222649112 )
Tetration – http://en.wikipedia.org/wiki/K.....w_notation
September 29th, 2008 at 12:51 am, GMT +0000 ( 1222649507 )
Tetration
September 29th, 2008 at 12:54 am, GMT +0000 ( 1222649652 )
Tetration?
September 29th, 2008 at 1:25 am, GMT +0000 ( 1222651543 )
Tetration.
September 29th, 2008 at 3:42 am, GMT +0000 ( 1222659752 )
Knuths up arrow notation
September 29th, 2008 at 4:59 am, GMT +0000 ( 1222664345 )
Tetration /Knuth’s up arrow notation.
a power a power a power….. b times..
September 29th, 2008 at 6:19 am, GMT +0000 ( 1222669160 )
Tetration
September 29th, 2008 at 6:59 am, GMT +0000 ( 1222671589 )
knuths up arrow
September 29th, 2008 at 8:24 am, GMT +0000 ( 1222676665 )
Iterated exponentiation or tetration. Invented by Don Knuth.
September 29th, 2008 at 9:46 am, GMT +0000 ( 1222681569 )
Iterated powers da…
a^(a^(a^(… and so on b times)))
September 29th, 2008 at 1:42 pm, GMT +0000 ( 1222695724 )
Tetration ..Iterated Exponential