Let g(n,x) be the nth iterate of f(x), i.e. g(0,x) = x g(1,x) = f(x) g(2,x) = f(f(x)) etc. If f is the log function, is there a nice function that behaves like g when n is integral, but allows for non-integer values (something like the gamma function wrt factorial)? -- Mike Stay staym@clear.net.nz http://www.xaim.com/staym