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many ways while preparing the manuscript. His indulgence over my failure to meet deadlines is also acknowledged. Many musicians have filled my office with beautiful music during the preparation of the manuscript: I am grateful to J S Bach, Ryuichi Sakamoto, Ravi Shankar and Erik Satie. Finally I am greatly indebted to my wife Yoko, to whom this book is dedicated, for her encouragement and moral support.
MIKIO NAKAHARA
SHIZUOKA, FEBRUARY 1989

Start of Citation[PU]Institute of Physics Publishing[/PU][DP]1990[/DP]End of Citation