Abstract

We study the question of whether for a given nonconstant holomorphic function f there is a pair of domains U;V such that f is the only nonconstant holomorphic function with f(U) µ V. We show existence of such a pair for several classes of rational functions, namely maps of degree 1 and 2 as well as arbitrary degree Blaschke products. We give explicit constructions of U and V , where possible. Consequences for the generalized Kobayashi and Caratheodory metrics are also presented.

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