Structure of the McMullen domain in the parameter planes for rational maps
Robert L. Devaney (2005)
Fundamenta Mathematicae
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We show that, for the family of functions where n ≥ 3 and λ ∈ ℂ, there is a unique McMullen domain in parameter space. A McMullen domain is a region where the Julia set of is homeomorphic to a Cantor set of circles. We also prove that this McMullen domain is a simply connected region in the plane that is bounded by a simple closed curve.