Visiting Professor:

 

 

  1. Laboratoire LADIST, Bordeaux (Francia), January 1991, January 1994, July 1995;

  2. Dipartimento di Matematica, Canton Ticino,  Bellinzona  (Svizzera), March 1991;

  3. Department of Mathematics Education, University “Comenius”, Bratislava (Sloavk), July 1999.

  4. Department of Mathematics Education, University “Comenius”, Bratislava (Sloavk), May 2000.

  5. Faculty of Science Education, Department of Mathematics Education, University of Nicosia (Cyprus), September 2000.

  6. Faculty of Mathematics Education, University of Tunis, December 2002.

  7. Department of Mathematics Education, University “Comenius”, Bratislava (Sloavk), January 2003.

  8. Department of Mathematics Education, University “Comenius”, Bratislava (Sloavk), Juin 2003.

  9. Department of Mathematics Education, University “Comenius”, Bratislava (Sloavk), September 2003.

  10. Department of Mathematics, University of Tsinghua, Beijing, China, 27-30 september 2005.

  11. Department of Mathematics Education, University “Comenius”, Bratislava (Sloavk), Mars 2006.

    12. Department of Mathematics Education, University “Comenius”, Bratislava (Sloavk), May, September 2007.