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Research Stays

• February 15. - March 15. 1993, The Fields Institute, Waterloo, Canada, Dynamical Systems Year
• May 8.-21. 1995, Department of Mathematics, Cornell University
• June-July 1995, Institut for Applications of Computer Algebra (RIACA), Amsterdam, Netherlands, Nonlinear Dynamical Systems Project
• September 1. - December 30. 1998, Mathematical Science Research Institute (MSRI), Berkeley, USA, Programm Symbolic Computation in Geometry and Analysis, organised by M.-F. Roy, M. Singer und B. Sturmfels
• March 24. - April 9. 1999, Institute pf Mathematics and Statistics, University of Kent in Canterbury, England
• October - November 2000, guest professor at the university of Hamburg
• April 3. - June 30. 2001, Department of Mathematics University of California at Berkeley, USA
• October 1. 2001 - February 28. 2002, Ontario Research Chair of Computer Algebra, ORCCA, University of Western Ontario, London, Canada.