Affiliation: | (1) Department of Mathematics, Stanford University, Stanford, CA 94305-2125, USA; e-mail: bump@math.stanford.edu , US;(2) Department of Mathematics, Tel Aviv University, Ramat Aviv, 69978, Israel; e-mail: ginzburg@math.tau.ac.il , IL;(3) Department of Mathematics, Brown University, Providence, RI 02912, USA; e-mail: jhoff@gauss.math.brown.edu, US |