mccaugh@s.cs.uiuc.edu (08/16/89)
2
Just a quick request about the recurrence: f(z) = z + c, which I have
often seen cited as "classic Mandelbrot": what are the:
1) starting values of z and
2) constant value for c
usually used? I have heard that the starting value for z must be near a fixed
point of the recurrence, which of course is (1 +/- Sqrt(1 - 4*c))/2, and for
z to be complex requires that (1 - 4*c) < 0, or: c > 1/4. But should c itself
be real or complex?