Acknowledgments
Fukagawa Hidetoshi would like to thank many friends and colleagues who supplied illustrations, books, access to sangaku and assistance while preparing Sacred Mathematics. They include Abe Haruki, Endo Shinosuke, Hori Yoji, Ito Akira, John Rigby, Matsuzaki Toshio, Naoi Isao, Nishiyama Hiroyuki, Nomura Tatsumi, Oyama Shigeo, Peter Wong, Fujii Sadao, Sasaki Eiji, and Taniguchi Takeshi. Most of all he thanks his wife Fukagawa Miyoko for her patience with his lifelong hobby. The authors are also grateful to the Asahi Shinbun company for sponsoring the 2005 sangaku exhibit in Nagoya and making available images from the exhibit catalog for this book. We thank as well the numerous institutions who supplied material and illustrations. They are Agano City Board of Education, the Aichi University of Education Library, the Hiroshige Art Museum of Nakasendou, the Imizu city Shinminato Museum, the Japan Academy, the Maeda Ikutokukai Institute, the Nagasaki Museum of History and Culture, Nagoya Broadcast Network Co., Ltd., the Sekigahara Museum of History and Culture, the Tsurumai Central Library City of Nagoya, and Tamura City Board of Education. This book would not have been possible without the cooperation of the many shrines and temples that permitted access to their sangaku, allowed them to be photographed, and to be placed on display. The authors are grateful to the Abe no Monjuin temple in Fukushima prefecture, the Atsuta shrine in Aichi prefecture, the Dewasanzan shrine in Yamagata prefecture, the Isobe shrine in Fukui prefecture, the Katayamahiko shrine in Okayama prefecture, the Kitamuki Kannon temple in Nagano prefecture, the Meiseirinji temple in Gifu prefecture, the Mizuho shrine in Nagano prefecture, the Shimizu shrine in Nagano prefecture, the Souzume shrine in Okayama prefecture, the Sugawara shrine in Mie prefecture, the Todaiji temple, and the Ubara shrine. Tony Rothman would like to thank John Delaney of the Historic Maps Collection at Princeton University for supplying rare maps of Japan, the staff at Princeton University Press for their willingness to take on a complex project, Yasuko Makino for help with the transliterations, and Marvin Suomi for generous support.