Re:Tetration
by michael_dorfman on Sunday May 02, 2010 @02:33PM
(#1312903)
I like the article, too, but I'm always disappointed when it doesn't cover Knuth's up-arrow, which seems absurdly relevant.
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| on HN ]
Thanks. Obviously http://en.wikipedia.org/wiki/Knuth%27s_up-arrow_notation
Shorter read: http://www.daviddarling.info/encyclopedia/K/Knuths_up-arrow_... , which comes quickly to next step:
Three up-arrows together represent a still more vastly powerful operator, equivalent to hyper5 or pentation, or a power tower of power towers