Baer Colloquium

Saturday, June 24, 2017  

10:00h  10:30h  Coffee and tea 
10:30h  11:30h  Bertrand Rémy (École Polytechnique, Palaiseau) Wonderful compactifications of Bruhat–Tits buildings
We will introduce the general theme of compactifying buildings attached to semisimple groups over local fields.
In the case of a split group, we can identify equivariantly the maximal Satake–Berkovich compactification of the corresponding Euclidean building
with the compactification obtained by embedding the building in the Berkovich analytic space associated to the wonderful compactification of the group.
The relationship between the structures at infinity, one coming from strata of the wonderful compactification and the other from Bruhat–Tits buildings,
can be described.

11:30h  12:00h  Coffee break 
12:00h  13:00h  Michael Joswig (T.U. Berlin) Matroids from hypersimplex splits
Studying regular subdivisions of a class of convex polytopes which are called
hypersimplices naturally leads to a new class of matroids, which we call split
matroids. Very many matroids are of this type; e.g., the paving matroids arise
as special cases. It turns out that the structural properties of the split
matroids can be exploited to obtain new results in tropical geometry.
Interestingly, prominent examples of finite geometries, such as the Fano plane,
play an important role. Joint work with Benjamin Schröter.

13:00h  14:30h  Lunch break 
14:30h  15:30h  Karsten Naert (Universiteit Gent) Suzuki–Ree groups as algebraic groups over \( \mathbb{F}_{\sqrt{p}} \)
Amongst the finite simple groups, the Suzuki–Ree groups are peculiar, because they "are not algebraic groups";
more precisely they are not in a natural way (derived subgroups of groups) of the form \( G(K) \), where \( G \) is an algebraic \( k \)group
and \( K \) a \( k \)algebra. Intuitively though, they should be algebraic groups over the field with \( \sqrt p \) elements.

15:30h  16:00h  Coffee break 
16:00h  17:00h  JostHinrich Eschenburg (Universität Augsburg) Rosenfeld planes
The following is mainly work of my PhD student Erich Dorner.

Registration is closed.
In case you plan to arrive on Friday, this list of hotels might help you. If you are interested to visit Ghent (which is a beautiful historical city, voted "most pleasant city of Flanders" in 2005), the website www.visitgent.be is a good starting point to find more information.
This map might help you to find the precise location of the department of mathemematics, where the event will take place. It can easily be reached by train (15 minute walk from the main station) or by highway (E17 or E40).
If you need more information, you can contact one of the organizers, by sending an email message to Tom.DeMedts@UGent.be or Hendrik.VanMaldeghem@UGent.be.
(last update: June 26, 2017)