... Beig, Wien, Austria J Ehlers, Potsdam, Germany U Frisch, Nice, France K Hepp, Z¨ rich, Switzerland u W Hillebrandt, Garching, Germany D Imboden, Z¨ rich, Switzerland u R L Jaffe, Cambridge, MA, ... Quantum Field Theory Proceedings of the Ringberg Workshop Held at Tegernsee, Germany, 21-24 June 1998 On the Occasion of Wolfhart Zimmermann’s 70th Birthday 13 Editors Peter Breitenlohner Dieter Maison ... rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on...