ESI The Erwin Schr¨ odinger International Boltzmanngasse 9 Institute for Mathematical Physics A-1090 Wien, Austria Entropy Theory without Past E. Glasner J.-P. Thouvenot B. Weiss Vienna, Preprint ESI 612 (1998) October 5, 1998 Supported by Federal Ministry of Science and Transport, Austria Available via anonymous ftp or gopher from FTP.ESI.AC.AT or via WWW, URL: http://www.esi.ac.at