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2008: Barbados, Kansas, Wisconsin 2007: NYU/Columbia/City, Princeton, Rutgers, IAS 2006: Waterloo, McMaster, Georgia 2005: Stanford 2004: NYU/Princeton, Harvard, Cambridge 2003: Toronto 2001: Montreal Joint Colloquium, Furman 2000: Clemson 1999: Montreal Joint Colloquium, Georgia Tech 1998: Arizona. 1997: Shandong U, Acad. Sinica (Beijing), NorthWestern U (Xian), Guangzhou, McGill 1996: Colorado 1995: North Carolina State, York, Delaware 1994: Michigan (Ann Arbor, x5), Concordia (Montreal), Western Ontario (London), Toronto, Urbana-Champaign, Ohio State 1993: Isaac Newton Institute, Villadollid (x2) Complutense (Madrid), Sheffield, Oxford, Autonoma (Madrid). 1992: Columbia (New York City), Princeton, Georgia Tech. 1991: Institute for Advanced Study. 1990: Institute for Advanced Study (x2), Pace, Stanford, S.U.N.Y. (Buffalo), UBC, Maryland. 1989: Florida, Queen's, Rochester, UBC, Urbana--Champaign, Toronto, Wisconsin, Georgia, Purkyne, Slovak Acad. Sci. (Bratislava), Hungarian Acad. Sci. (Budapest), Institute for Advanced Study. 1988: Waterloo, Berkeley, Rochester. 1987: Laval, Carleton, Queen's 1986: Carleton (Ottawa), Waterloo. | ||||||||||||||||||||||||||||||||||||||||||||||