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Results tagged with lie-groups
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user 99468
Lie Groups are Groups that are additionally smooth manifolds such that the multiplication and the inverse maps are smooth.
3
votes
1
answer
282
views
Closed Semi-Riemannian manifolds with non-compact isometry group
Does anyone know a good reference for general results about closed Semi-Riemannian manifolds which have a non-compact isometry group?
Edit: My goal is to understand a bit better what the intuition b …
- 893
20
votes
1
answer
1k
views
Why does the proof of Myers and Steenrod fail in the Lorentzian case?
This is my first question on this site. I hope it is not inappropriate on MO.
Myers and Steenrod proved 1939 that the isometry group of a Riemannian manifold is a lie group. I add a picture where Ko …
- 893