Sergey Novikov, University of Maryland, College Park, MD, and Steklov Institute of Mathematics, Moscow, Russia Igor Krichever, Columbia University, New York, NY, and Skoltech, Moscow, Russia Oleg Ogievetsky, Center of Theoretical Physics, Marseille, France, and Lebedev Physical Institute, Moscow, Russia Senya Shlosman, Center of Theoretical Physics, Marseille, France, and Skoltech, Moscow, Russia