BRICS Basic Research in Computer Science Preliminary Proceedings of the Workshop on Geometry and Topology in Concurrency and Distributed Computing GETCO 2004 Amsterdam, The Netherlands, October 4, 2004 Patrick Cousot Lisbeth Fajstrup Eric Goubault Maurice Herlihy Martin Raußen Vladimiro Sassone (editors) BRICS Notes Series NS-04-2 ISSN 0909-3206 September 2004 BRICS NS-04-2 Cousot et al. (eds.): GETCO 2004 Preliminary Proceedings