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Second Workshop Donau-Isar-Inn: WDI² - Approximation Theory and Applications

Program     Registration     Directions


  • Date: Friday, February 12, 2016, 2:30 PM to 6:30 PM.
  • Location: Zentrum Mathematik der TU München, Boltzmannstr. 3, 85747 Garching, Room MI 02.08.011.


2:30pm    Sparse FFT: can the fast Fourier transform be made even faster?

Prof. Gerlind Plonka-Hoch Pfeil
Universität Göttingen

In this talk we will sketch the idea of an edge detection method which allows a simultaneous estimation of the edges’ curvature. To this end, we will expand the concept of the classical Wavefront Set, which indicates the position and direction of a singularity, to also include its local curvature. On this basis we will introduce the Parabolic Curvelet Transform and show its connection to the expansion of the Wavefront Set.​

Thomas Fink Pfeil
Universität Passau
4:00pm    Coffee and Cake

In modern data analysis, one frequently needs to deal with high-dimensional data sets. To alleviate the computational and storage issues that arise in handling this type of data, it is of interest to pre-process the data set to reduce its dimensionality, while preserving the information in the data that is vital for the computational task at hand.

In this talk I will consider dimensionality reduction with Johnson-Lindenstrauss embeddings, which are random matrix constructions aimed at reducing the dimension while approximately preserving Euclidean inter-point distances in the data set. In particular I will focus on the 'fast' and 'sparse' Johnson-Lindenstrauss embeddings, which allow for a fast implementation. The presented results describe how the achievable embedding dimension depends on the desired approximation error and the 'intrinsic dimension' of the original data set. If time permits, I will discuss applications to manifold embeddings and constrained least squares programs.

This talk is partly based on joint work with Jean Bourgain (IAS Princeton) and Jelani Nelson (Harvard).​

Prof. Sjoerd Dirksen Pfeil
RWTH Aachen
5:45pm    Compressed Sensing in Photoacoustic Tomography

Michael Sandbichler Pfeil
Universität Innsbruck

Workshop dinner

We invite the participants to join us for dinner in a the Flamm's CafeBar & Restaurant Pfeil, Rathausplatz 2, 85748 Garching, in the city center of Garching.


If you are interested in our workshop, please register until February 8, 2016. This will facilitate the organization of the event. Registration is free.

For registration, please contact Frau Silvia Toth-Pinter ( We can also book an accommodation for you if preferred.


The venue of the workshop is the building of the Mathematics and Informatics departments of TU München (Boltzmannstr. 3, 85747 Garching) on the Garching campus, Room MI 02.08.011, located on the second floor.

The Garching campus can easily be reached by subway (U-Bahn Linie U6, station Garching-Forschungszentrum) from Munich city center. There are many parking lots free of charge in Ludwig-Prandtl-Straße at the back of the building. Further details can be found here.


  Person E-Mail
PhD Student   Christian Kümmerle  
PhD Student   Kristof Schröder Pfeil  
PhD Student   Juliane Sigl
Professor   Felix Krahmer