[Vortraege] Vortragsankündigungen KW. 37

[Danijela Radosavljevic]

Sehr geehrte Fakultätsmitglieder,

anbei die Vortragsankündigungen für die kommende Woche, im Anhang finden 
Sie den Text auch als PDF Datei.

Mit freundlichen Grüßen

Danijela Radosavljevic

Sekretariat
Institut für Mathematik
Universität Wien
Nordbergstr. 15, UZA 4
Tel: 43 1 4277 50629
Fax: 43 1 4277 9506


*Vorträge*

**

*Donnerstag, 13. September 2012, Seminarraum, **Olga Taussky-Todd 
Seminarraum*

*(C 209), UZA 4***

*Außerordentliches mathematisches Kolloquium*

**

*/_Vortrag: 14:00-14:45 Uhr: _/**//*

*/Prof. Dr. Christoph Schnörr (Uni Heidelberg) /*

*/"Variational and Optimization Approaches to Image Partitioning -- 
Discrete and Continuous Aspects"/*

*//*

*(K&K 14:45 Uhr -- 15:00 Uhr, Common Room C 206)*

*_
_*

*/_Vortrag: 15:15-16:00 Uhr_/*

*/Prof. Dr. Mathias Hein (Uni Saarland)/*

*/"Tight relaxations of combinatorial problems as nonlinear eigenproblems"/*

*//*

/_Abstract:_///

/Many problems in unsupervised learning are of combinatorial nature. 
Prominent examples are balanced graph cuts for clustering, feature 
selection and the densest subgraph problem in community detection./

/The purpose of the talk will be i) to address and characterize the full 
range of combinatorial problems which allow for a tight relaxation as a 
continuous nonlinear eigenproblem and ii) to discuss the efficient 
computation of nonlinear eigenvectors. While the resulting optimization 
problem for the computation of nonlinear eigenvectors is non-convex, 
nonlinear eigenvectors can be computed by solving a sequence of convex 
optimization problems./

/For the solution of the combinatorial problems we will show how one can 
develop similarly algorithms which compute critical points via a 
discrete d.c. type algorithm. We are aiming at a comparison of both 
types of algorithms in the continuous and set-valued domain in terms of 
speed and quality./

*_
_*

*Dekan Univ.-Prof. Dr. Harald Rindler, Univ.-Prof. Dipl.-Ing. Dr. Otmar 
Scherzer*

**

*Montag, 3. September 2012, ab 9:00 Uhr bis Freitag, 14. September 2012, 
ab 9:00 Uhr, Erwin Schrödinger Lecture Hall, Boltzmanngasse 9, 1090 Wien*

*The Interaction of Geometry and Representation Theory.Exploring new 
frontiers*

*(Details siehe Attachment)*

*organized by: Andreas Cap, Alan Carey, A. Rod Gover, C. Robin Graham, 
Jan Slovak*

**

**


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