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Abstracts for Special Colloquium for Werner Ballmann

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Counterintuitive approximations

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Speaker: 
Christian Bär
Affiliation: 
Universität Potsdam
Date: 
Thu, 18/04/2019 - 13:45 - 14:45
Location: 
MPIM Lecture Hall
Parent event: 
MPI-Oberseminar
Parent event: 
Oberseminar Differentialgeometrie
Parent event: 
Special Colloquium for Werner Ballmann

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

Posted in
Speaker: 
Anna Wienhard
Affiliation: 
Universität Heidelberg
Date: 
Thu, 18/04/2019 - 15:00 - 16:00
Location: 
MPIM Lecture Hall
Parent event: 
MPI-Oberseminar
Parent event: 
Oberseminar Differentialgeometrie
Parent event: 
Special Colloquium for Werner Ballmann

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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