File: newton.frm

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Newton_poly { ; Tim Wegner - use float=yes
   ; fractal generated by Newton formula z^3 - 3z
   z = pixel, z2 = z*z, z3 = z*z2:
   z = (2*z3) / (3*z2 - 3);
   z2 = z*z;
   z3 = z*z2,
  .004 <= |z3 - 3*z|
  }

newtz3 {
  ; Note use floating point
  z = pixel:
  z2 = z * z,
  z3 = z2 * z,
  z = (2 * z3) / (3 * (z2 - 1)),
  0.004 <= |z3 - 3 * z|
  }