Invariant meromorphic functions on Stein spaces

Details Invariant meromorphic functions on Stein spaces Invariant meromorphic functions on Stein spaces

2010-10-14

arxiv.org/abs/1010.2935v1

Mathematics

Complex Variables

20 pages, 1 figure

Scientific paper

In this paper we develop fundamental tools and methods to study meromorphic functions in an equivariant setup. As our main result we construct quotients of Rosenlicht-type for Stein spaces acted upon holomorphically by complex-reductive Lie groups and their algebraic subgroups. In particular, we show that in this setup invariant meromorphic functions separate orbits in general position. Applications to almost homogeneous spaces and principal orbit types are given. Furthermore, we use the main result to investigate the relation between holomorphic and meromorphic invariants for reductive group actions. As one important step in our proof we obtain a weak equivariant analogue of Narasimhan's embedding theorem for Stein spaces.

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