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Abstracts for Special Colloquium for Werner Ballmann

Alternatively have a look at the program.

Counterintuitive approximations

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Speaker: 
Christian Bär
Zugehörigkeit: 
Universität Potsdam
Datum: 
Don, 2019-04-18 13:45 - 14:45
Location: 
MPIM Lecture Hall

The Nash-Kuiper embedding theorem is a prototypical example of a counterintuitive approximation result: any short embedding of a Riemannian manifold into Euclidean space can be approximated by *isometric* ones. As a consequence, any surface can be isometrically C^1-embedded into an arbitrarily small ball in R^3.

Surfaces and higher rank symmetric spaces

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Speaker: 
Anna Wienhard
Zugehörigkeit: 
Universität Heidelberg
Datum: 
Don, 2019-04-18 15:00 - 16:00
Location: 
MPIM Lecture Hall

Surfaces and higher rank symmetric spaces play an important role in Werner Ballmann's career.
In this talk we will bring surfaces and higher rank symmetric spaces together in a different spirit.
We introduce (particularly nice) actions of surface groups on higher rank symmetric spaces and
discuss their geometric and dynamical properties. 

 

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