4 INTRODUCTION
and helped prepare the manuscripts. The enthusiastic participation of the students
and researchers made the Summer School a lively and stimulating learning envi-
ronment. On the administrative side, we sincerely appreciate the untiring efforts
of Anne Humes, Catherine Jordan, and their staff. Lastly, we acknowledge David
Morrison for his fine guidance while developing the plans for the Summer School
and John Polking for his strong leadership of the IAS/PCMI.
Yakov Eliashberg and Lisa Traynor, Volume Editors
October, 1998