Iterated log, usually written as log*(n), is defined piecewise as:
+---------------------
/ 0 if n<:1
log*(n)=
\ 1+log*(log n) if n> 1
+---------------------
This can be expressed directly in J using agenda (@.):
logstar =: 0:`(1+$:@^.)@.(1<:])"0
But this feels fairly "procedural". All the work is in the recursion. Is
there a more elegant way to express it?
-Dan
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