Affiliation: | (1) CNRS, Université Paris-Sud, UMR 8628, F-91405 Orsay, France;(2) Department of Mathematics, Queens College CUNY, Flushing, New York, 11367;(3) Département des Mathématiques, Université de Cergy-Pontoise, F-95302 Cergy-Pontoise, France;(4) Present address: IHES, F-91440 Bures-sur-Yvette, France;(5) Department of Mathematics, CUNY Graduate School, New York, New York, 10016 |