# Colloquium on the Geometry of Groups and Numbers

Taking place at Université Pierre et Marie Curie, 8th of June, 2017.

Organisers : Alexander D. Rahm and Gabor Wiese (for any questions, please contact Alexander D. Rahm first)

### Speakers:

Mladen Dimitrov (Université Lille 1) :
p-adic L-functions for GL(2n)

Paul E. Gunnells (University of Massachusetts Amherst, to be confirmed)

Günter Harder (Hausdorff Center for Mathematics, Bonn) :
Divisibility of *L*-values and the existence of non trivial cohomology classes

Hans-Werner Henn (Université de Strasbourg) :
On the mod-2 cohomology of SL_3(**Z**[1/2,i])

David Kohel (Université d'Aix-Marseille) : Recognizing G_2

Ralf Köhl (Universität Giessen) : Kac-Moody symmetric spaces

Alain Valette (Université de Neuchâtel) : Explicit Baum-Connes for lamplighter groups over finite groups

**Detailed scientific programme (double-page of abstracts) in printable format.**

Registration was for free and by informal email to the co-organiser Alexander D. Rahm, whom you can also contact for any questions.

**Timetable of the workshop.** All talks take place in the room 15-25.502 of
Institut Mathematique de Jussieu
- Paris Rive Gauche (IMJ-PRG),
UPMC - Campus Jussieu,
4, place Jussieu, Paris.

13:30 - Opening of the colloquium, talk of Alain Valette : Explicit Baum-Connes for lamplighter groups over finite groups

14:10 - talk of Ralf Köhl : Kac-Moody symmetric spaces

14:50 - talk of Mladen Dimitrov : p-adic L-functions for GL(2n)

15:30 - coffee break

16:00 - talk of Hans-Werner Henn : On the mod-2 cohomology of SL_3(**Z**[1/2,i])

16:40 - talk of Günter Harder : Divisibility of *L*-values and the existence of non trivial cohomology classes

17:20 - talk of David Kohel : Recognizing G_2

18:00 - talk of Paul Gunnells (to be confirmed)

20:00 - dinner

Printable poster (A4 letter format).

Travel information.

Picture copyrights : The diagram is taken from the HDR thesis of Alexander D. Rahm,
which was defended on the morning of the same day (9:30 a.m.), in the same room (15-25.502 of IMJ-PRG).

The colloquium photograph has been taken by the colloquium participant Jie Lin (post-doctorante à l'IHES).