VISITING EXPERIENCE VISITING EXPERIENCE

July 1995--August 1995: the Royal Society Research Fellow, University of Warwick, UK.

May 1996 -- May 1997: the Royal Society Research Fellow, University of Warwick, UK.

Feb. 1998 -- April 1998:General Member, Mathematics Science Research Institute, Berkeley, USA.

April 1998 -- June 1998: Visiting Professor, University of P. Sabatier, Toulouse, France.

August 1998 -- Feb. 2000: Alexander von Humboldt Research Fellow, University of Bielefeld, German
March 2000 -- July 2000: Guest Professor, University of Bielefeld, Germany.

October 2000 -- December 2000: Guest Professor, University of Connecticut, USA.
July 2001--September 2001: University of Bielefeld, Germany.

April 2002--May 2002: University of Bielefeld, Germany.

July 2002--August 2002: Academia Sinica, Tapei.

June 2003--August 2003, University of Bielefeld, Germany.

Many other shorter visits in UK, Germany, France, Russia, USA, Japan, Singapore.

J