M A T H E M A T I C S S E M I N A R S 2008 Tuesday, 8 April at 14:00 hrs. Dr. Tulkin H. Rasulov (Samarkand State University, Samarkand, Uzbekistan) "On the spectral properties of Hamiltonians without conservation of the particle number" VENUE: SEMINAR ROOM (ICTP Leonardo Building, first floor)