Orbit projections as fibrations |
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Authors: | Armin Rainer |
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Institution: | 1.Fakult?t für Mathematik,Universit?t Wien,Wien,Austria |
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Abstract: | The orbit projection π: M → M/G of a proper G-manifold M is a fibration if and only if all points in M are regular. Under additional assumptions we show that π is a quasifibration if and only if all points are regular. We get a full answer in the equivariant category: π is a G-quasifibration if and only if all points are regular. |
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Keywords: | orbit projection proper G-manifold fibration quasifibration |
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