The main theme of many mathematical subjects are maps with some properties -- be it homomorphisms, homeomorphisms, or just any map between sets. Especially interesting are bijective maps with the same object as domain and codomain, which are called automorphisms of said object. These describe symmetries of the object. In complex analysis, we deal with holomorphic automorphisms, which preserve angles. The goal of this thesis is to analyze groups of holomorphic automorphisms of some domains in the complex plane and of compact Riemann surfaces.
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