Affiliation: | (1) Department of Mathematics, Duke University, Box 90320, 27708-0320 Durham, NC, USA;(2) Microsoft Research, 1, Microsoft Way, 98052 Redmond, WA, USA;(3) The Weizmann Institute of Science, Rehovot, Israel;(4) Départment de Mathématiques, Université Paris-Sud, Bat. 425, FR-91405 Orsay Cedex, France |