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
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.
Technion Math Net-2 (TECHMATH2)
Editor: Michael Cwikel   <> 
Announcement from: Diana Mandelik   <>