The  Weizmann  Institute  of  Science
                  Faculty of Mathematics and Computer Science
 
                        Seminar in Geometry and Topology
 
                    Seminar Room, Room 261, Ziskind Building
                          on Sunday, December 26, 2010
                                    at 14:00
 
                         Note unusual day and time 
 
                                 Eugene Gutkin
                              University of Torun
 
                                 will speak on
 
                             Security and flatness
 
Abstract:
A manifold is secure if the geodesics between any pair of points can be blocked
by a finite set of point obstacles.  Conjecture: a compact manifold is secure
iff it is flat.  I will report on a proof of this for surfaces.
 
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Technion Math Net-2 (TECHMATH2)
Editor: Michael Cwikel   <techm@math.technion.ac.il> 
Announcement from: Diana Mandelik   <diana.mandelik@weizmann.ac.il>