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Radó's theorem (Riemann surfaces)
Theorem in complex analysis From Wikipedia, the free encyclopedia
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In mathematical complex analysis, Radó's theorem, proved by Tibor Radó (1925), states that every connected Riemann surface is second-countable (has a countable base for its topology).
This article needs additional citations for verification. (May 2023) |
The Prüfer surface is an example of a surface with no countable base for the topology, so cannot have the structure of a Riemann surface.
The obvious analogue of Radó's theorem in higher dimensions is false: there are 2-dimensional connected complex manifolds that are not second-countable.
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References
- Hubbard, John Hamal (2006), Teichmüller theory and applications to geometry, topology, and dynamics. Vol. 1, Matrix Editions, Ithaca, NY, ISBN 978-0-9715766-2-9, MR 2245223
- Radó, Tibor (1925), "Über den Begriff der Riemannschen Fläche", Acta Szeged, 2 (2): 101–121, JFM 51.0273.01, archived from the original on 2011-07-21, retrieved 2011-03-26
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