I wrote: > t=: ^~^:]x: But this was clearly incorrect (try 4 (^~^:]x:) 3 vs. 4 ([:(^x:)/$~) 3).
That said, tetration has a very limited domain (3 ([:(^x:)/$~) 4 gives a limit error). -- Raul ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
