Masterclass – Cohomology of arithmetic groups – University of Copenhagen

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Cohomology of arithmetic groups

University of Copenhagen - 8-11 May 2017

The cohomology of arithmetic groups is an important mathematical topic, that lies at the intersection of a number of mathematical fields. In particular, these cohomology groups are algebro-topological invariants, but the information they contain is of deep number-theoretic significance. To study them, mathematicians draw from such diverse fields as algebraic topology, harmonic and complex analysis, and number theory. Our goal is to give students and early career researchers an introduction to these ideas, and to foster future research.

The Masterclass will consist of two lecture series by Andy Putman and Harald Grobner, as well as a few contributed talks about current research.

Lecture series:

  • Andy Putman (Notre Dame)
    "Buildings, duality, and the high-dimensional cohomology of arithmetic groups."

  • Harald Grobner (Universität Wien)
    "Cohomological automorphic forms: A survey based on examples."


To be announced


The masterclass will take place at the Department of Mathematical Sciences, University of Copenhagen, with support from the Faculty of Science. See detailed instructions on how to reach Copenhagen and the conference venue.


A solid background in group theory and algebraic topology.

Schedule and abstracts:

There will be two lectures series consisting of four talks, and a few contributed talks. The schedule of the lectures will be made available in due course.

References, lecture material, and notes:

These will be made available here in due course.

Financial support:

Graduate students and other early career researchers can apply for financial support to partly cover local expenses. If you wish to apply for support, please indicate this on the registration form. The support should be roughly DKK 500 per day, at most DKK 2500 in total. 

Registration and Participants:

The registration form can be found here. Deadline 24 April 2017.
We especially encourage women and underrepresented minorities to apply. 
A list of participants will be published here eventually.

Accommodation and public transportation:

We kindly ask the participants to arrange their own accommodation. We recommend Hotel 9 Små Hjem, which is pleasant and inexpensive and offers rooms with a kitchen. Other inexpensive alternatives are  CabInn, which has several locations in Copenhagen: the Hotel City (close to Tivoli), Hotel Scandivania (Frederiksberg, close to the lakes), and Hotel Express (Frederiksberg) are the most convenient locations; the latter two are 2.5-3 km from the math department. Somewhat more expensive – and still recommended – options are Hotel Nora and  Ibsen's Hotel.

An additional option is to combine a stay at the CabInn Metro Hotel with a pass for Copenhagen (efficient and reliable) public transportation (e.g. FlexCard 7 days with 2 zones, CityPass 24 or 72 hours). 

Tickets and passes for public transportation can be bought at the Copenhagen Airport and every train or metro station. You can find the DSB office on your right hand side as soon as you come out of the arrival area of the airport. DSB has an agreement with 7-Eleven, so many of their shops double as selling points for public transportation. A journey planner in english is available. More information on the "find us" webpage.

Organised by Alexander Kupers and Nathalie Wahl.