Tenth Homework Set Answers

14. (a) is a point outside the Mandelbrot set, so the Julia set is a Cantor set. Only 5 is a Cantor set.
(b) lies in the 4-cycle disc of the upper principal series, so the Julia set must have four lobes meeting at each branch point. Only 3 satisfies this condition.
(c) lies in the largest disc between the 2-cycle disc and the 3-cycle disc of the lower principal series. Consequently, (c) is a 5-cycl disc. The Julia set must have five lobes meeting at each branch point. Only 6 satisfies this condition.
(d) lies in a 6-cycle disc attached to the 2-cycle disc. The Julia set has branch points where two lobes meet, and branch points where three lobes meet. This is picture 4.
(e) lies in the 3-cycle disc of the upper principal series, so the Julia set has three lobes meeting at each branch point. This is picture 2.
(f) lies in the main cardioid, corresponding to a fixed point, so the Julia set has no branch points. This is picture 1.
1 2
3 4
5 6

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