Steven Wilf
Institute for Advanced Studies at the Hebrew University of Jerusalem

I would like to thank Anne Dailey, Ron Harris, Morton Horwitz, Amalia Kessler, Roy Kreitner, Pnina Lahav, Assaf Likhovski, Jeremy Paul, Richard Ross, Susan Schmeiser, Yoram Shachar, Christopher Tomlins, and Carol Weisbrod. I am grateful to the Institute for Advanced Studies at the Hebrew University of Jerusalem, which provided such a superb environment for the writing of this Article.