Reports
15/03/08 MaMuPhi Seminar: Rene Guitart / 26/03/08 Seminar IREM, IHP Paris: Rene Guitart: The mathematical conceptions of Charles Ehresmann and especially his contributions to the theory of categories, in particular his role in the formation of the category-theoretic view of differential geometry / 18/06/07 ENS Colloquium: Rene Guitart: The Yoneda Lemma, 50 years on / 20/09/02 Journee Mathematique in honour of Albert Buroni, University of Paris VII: Rene Guitart: Categories, algebraic theories and computer science