Simulating self-organization and Chaos in Collective Phenomena Combinatory Systems and Combinatory Automata The Third International Conference on Discrete Chaotic Dynamics in Nature and Society (DCDNS3) at Chuo University, Tokyo, Japan - September 9-13, 2002 Piero Mella, Chair of Business Economics - University of Pavia, Italy [email protected] - www.ea2000.it/CST