The following paper is available by anonymous ftp on the machine lmd.univ-mrs.fr in directory /pub/girard : GEOMETRY of INTERACTION 3 : THE GENERAL CASE --- Jean-Yves GIRARD Directeur de Recherche CNRS, Laboratoire de Mathematiques Discretes 163 Avenue de Luminy, case 930 13288 Marseille cedex 9 <girard@lmd.univ-mrs.fr> (33) 91 82 70 25 (33) 91 82 70 26 (Mme Bodin, secretariat) (33) 91 82 70 15 (Fax)