Abstract
It is well known that the bounding curve of the central hyperbolic component of the Multibrot set in the parameter space of unicritical degree d polynomials is an epicycloid with cusps. The interior of the epicycloid gives the polynomials of the form which have an attracting fixed point. We prove an analogous result for unicritical Blaschke products: in the parameter space of degree d unicritical Blaschke products, the parabolic functions are parameterized by an epicycloid with cusps and inside this epicycloid are the parameters which give rise to maps having an attracting fixed point in the unit disk. We further study in more detail the case when in which every Blaschke product is unicritical in the unit disk.
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