This volume is a collection of papers dedicated to Kenkichi
Iwasawa on his 70-th birthday, which took place on September 11,
1987. Some of the papers in this volume are based on the lectures
delivered at the workshop on “Iwasawa Theory and Special Values of
L-Functions” held at the Mathematical Sciences Research Institute in
Berkeley, California on J anuary 20—24, 1987. For the convenience of
the reader, a complete list of publications of Professor Iwasawa, along
with brief comments on them, is added to the beginning of this volume.
We hope this book will be a token of our hearty gratitude to and
admiration of him, which we share with mathematicians throughout
the world.
We would like to thank Y. Ihara, Y. Morita and T. Watanabe
for their help in the editorial work.