change of time: Thu, Sep 20, 3:30 p.m. Boston University Mathematical Physics Seminar MCS 180, Math Dept, 111 Cummington St. "Nonperturbative aspects of QFT" Dirk Kreimer IHES and Boston University Refreshments served at 3:15 p.m. http://math.bu.edu/research/mathphys/seminar.html