Hebrew University Amitsur Algebra Seminar ------------------------------- Time: Thursday, January 19, 12:00-13:15 Place: math 209 Speaker: Jean Lecureux Title: Boundaries of buildings and amenability Abstract: Buildings are useful geometric objects that appear in the study of semisimple p-adic groups, or some other interesting classes of groups, such as Kac-Moody groups. Roughly, they can be thought as an analogue of symmetric spaces for such groups. With P-E Caprace, we defined a new notion of a boundary for such buildings, which can be thought as an analogue of the maximal Satake-Furstenberg compactification of symmetric spaces. This boundary allows us to classify amenable group acting on the building; it is also possible to prove the amenability of the action on the boundary. After spending some time to recall what buildings are and what they're good for, I will explain the main features of this new boundary. You are cordially invited! <http://math.huji.ac.il/amitsur.html> --------------------------------------------------------- Technion Math Net-2 (TECHMATH2) Editor: Michael Cwikel <techm@math.technion.ac.il> Announcement from: Gili Schul <gili.schul@mail.huji.ac.il>