prepared with the assistance of Alan Evison. David Mumford with the assistance of C. Musili. by John M. Cage, with the assistance of C. J. Bashe. Irwin Unger ; with the assistance of Debi Unger. Translated by Maurice Holt, with the assistance of A. A. Sfeir. by Irwin Unger. With the assistance of Debi Unger.