These proceedings start with the official report of the Congress, given in the front pages, a list of donors, and a list of registrated participants, as well as the reports of the opening and closing ceremonies. The main body of the proceedings includes the papers presented by the 15 plenary speakers and 139 invited speakers, selected by the Programm Committee. These volumes are rounded off by the reports of the works of the four fields medalists V.G. Drinfield, V.F.R. Jones, S. Mori, E. Witten and the winner of the Rolf Nevanlinna Prize A.A. Razborov.