Linearization of Regular Proper Groupoids

Details Linearization of Regular Proper Groupoids Linearization of Regular Proper Groupoids

2001-07-05

arxiv.org/abs/math/0107038v2

Mathematics

Differential Geometry

24 pages (minor corrections in second version)

Scientific paper

Let G be a Lie groupoid over M such that the target-source map from G to M x M is proper. We show that, if O is an orbit of finite type (i.e. which admits a proper function with finitely many critical points), then the restriction G|U of G to some neighborhood U of O in M is isomorphic to a similar restriction of the action groupoid for the linear action of the transitive groupoid G|O on the normal bundle NO. The proof uses a deformation argument based on a cohomology vanishing theorem, along with a slice theorem which is derived from a new result on submersions with a fibre of finite type.

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