MATEMATICKA FIZIKA S E M I N A R Carlos Castro Clark Atlanta University, Atlanta, Georgia, USA ON THE RIEMANN HYPOTHESIS AND TACHYONS IN STRING SCATTERING AMPLITUDES Institut za fiziku, Pregrevica 118, Zemun Soba br. 300, Petak 23.09.2005 u 11.30 ----------------- Institute of Physics, Belgrade http://www.phy.bg.ac.yu/