U.S. Mail: Dept. of Mathematics, Duke University, Durham NC 27708-0320 USA Office: 022 Physics Building Office Phone: +1-919-660-2858 FAX: +1-919-660-2821 Home Phone: +1-919-563-3526 E-mail: tomberg@math.duke.edu Web page: http://www.math.duke.edu/faculty/tomberg/James Tomberg < tomberg@math.duke.edu>