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    (最終更新日:2017-02-21 13:51:28)
  スナダ トシカズ   Sunada Toshikazu
  砂田 利一
   所属   総合数理学部
   職種   専任教授
■ 主な作品
k4.JPG
これは1932年にドイツの結晶学者Fritz Lavesが発見した仮想的結晶であり、2006年にダイヤモンドと同じ対称性(強等方性)を持つことが砂田により証明されたことで、「ダイヤモンドの双子(diamond twin)」とよばれている。
■ 著書・論文
1. 著書  基本群とラプラシアン (単著) 1988
2. 著書  "行列と行列式I, II" (単著) 1988
3. 著書  "幾何入門I, II" (単著) 1996
4. 著書  曲面の幾何 (単著) 1977
5. 著書  高校生に贈る数学III (共著) 1996
全件表示(176件)
■ 学会発表
1. 2016/08/13 Generalized Riemann sums(Workshop on Discrete Analysis)
2. 2016/07/10 Creation of Mathematics: From Number Theory to Geometry(3rd Kyoto University-Inamori Foundation Joint Kyoto Prize Symposium)
3. 2015/06/22 Exponential Riemann sums and "near"-quasicrystals(Random and other ergodic problems)
4. 2015/06/12 Exponential Riemann sums and "near"-quasicrystals(Geometry in History)
5. 2014/06 Mathematical Crystallography("Groups, Graphs, and Random Walks", Conference in Honor of Wolfgang Woess's 60th Birthday, Cortona (Italy))
全件表示(35件)
■ 学歴
1. 1977
(学位取得)
東京大学 理学博士
2. ~1974/03 東京大学 理学研究科 数学 修士課程修了 理学修士
3. ~1972/03 東京工業大学 理学部 数学科 卒業
■ 職歴
1. 2013/04~ 明治大学 総合数理学部 教授
2. 2013/04~ 明治大学 総合数理学部 学部長
3. 2012/04~ 明治大学 先端数理科学インスティチュート(MIMS) 副所長
4. 2011/04~ 東北大学 原子分子材料科学高等研究機構(WPI) 連携教授
5. 2003/04~2013/03 明治大学 理工学部 教授
全件表示(24件)
■ 学内役職・委員
1. 2015/04/01~2017/03/31 明治大学 総合数理学部長
2. 2013/04/01~2015/03/31 明治大学 総合数理学部長
3. 2005/04/01~2006/03/31 明治大学 大学院理工学研究科基礎理工学専攻主任
4. 2005/04/01~2006/03/31 明治大学 理工学部数学科長
■ 所属学会
1. 数理物理学国際連合
2. 日本応用数理学会
3. 日本数学会
■ 社会における活動
1. 2014 Member of IMU Circle
2. 2010/04~2014 朝倉書店「Princeton Companion」編集委員会委員長
3. 2010/04~2013/07 日本学術振興会特別研究員等審査会専門委員
4. 2008/06~2009/06 アジア数学者会議2009(AMC2009)国際顧問委員会委員長
5. 2008/01~2013 ERC(ヨーロッパ科学評議会) パネル委員
全件表示(26件)
■ 研究課題・受託研究・科研費
1. 2015/04~2019/03  離散幾何解析学の進展(代表) 基盤研究(A) (キーワード:離散幾何解析、準結晶、tight frame)
2. 2012/04~2015/03  離散幾何解析学の展開(代表) 基盤研究 (B) 
3. 2009/04~2012/03  離散解析幾何学の発展と応用(代表) 基盤研究 (B) 
4. 2006/04~2008/03  非可換幾何解析学の研究(代表) 基盤研究 (C) 
5. 2001/04~2005/03  可換及び非可換ブロツホ理論(代表) 基盤研究 (A) 
全件表示(49件)
■ 委員会・協会等
1. 2014~2015 Scientific Advisory Committee of the special project ''Periodic and Ergodic Spectral Problems'' at Isaac Newton Institute for Mathematical Sciences Committee member
2. 2013~2014 Program Committee (Geometry Section) of ICM 2014 member
3. 2010~2015 「プリンストン数学集成」編集委員会 委員長
4. 2010~2014 European Research Council Panel member
5. 2007~2007 Organizing committee of the project ``Analysis on Graphs and Its Applications" at Issac Newton Institute Member
■ 受賞学術賞
1. 2013/03 日本数学会出版賞
2. 1988 日本数学会弥永賞
■ 現在の専門分野
幾何学, 数学基礎・応用数学 (キーワード:乱歩,幾何学的結晶学,離散群,ゼータ関数,力学系,スペクトル幾何学) 
■ プロフィール
(Excerpt from the survey article "An Overview of Sunada's work" written by A. Katsuda and P. W. Sy)

Professor Toshikazu Sunada was born in Tokyo, Japan, on September 7, 1948, three years after the end of World War II. He dwelled and grew up in the suburb of Tokyo until the age of twenty-five. Sunada described himself in his childhood as an ordinary boy, somewhat introverted and showing no particular interest in any subjects taught in primary and junior high schools. According to his reminiscence, he sat absentmindedly all day long during class hours. He even confessed that arithmetic was then his instinctive dislike.

His zest for mathematics arose when he was a high school student and had a chance to read "History of Modern Mathematics" written by Takagi Teiji, a Japanese luminary who established the class field theory, a culmination of algebraic number theory. The book, including a vivid description of the lives of Gauss, Abel, and Galois together with the development of the theory of elliptic functions, was so fascinating that it led him to the ambition of becoming a mathematician. Since he had thought of himself as a literature-oriented person at that time, this was a major turning point in his life.

He thus decided to study mathematics and entered Tokyo Institute of Technology (TIT), which had a department of mathematics of moderate size. However, soon after his admission to the university (1968), his study was disrupted by student riot, a movement sweeping over universities around the world. During this period, classes were cancelled and the campus was locked out. Interested students of the mathematics department voluntarily requested their teachers to organize seminars outside the campus. The subjects they took up then were vector bundles and complex multiplications; topics which were not covered in the regular lectures for undergraduate courses. The enthusiasm for mathematics that the teachers demonstrated as well as their selfless effort to impart knowledge even in this extraordinary period has left a lasting impression on the mind of the young Sunada. This experience made him more ambitious to become a professional mathematician. When Sunada was in his senior year, his supervisor was Prof. Koji Shiga, who conducted one of the seminars mentioned above and is now Sunada's lifelong friend.

After his undergraduate studies, he was admitted to the graduate school of the University of Tokyo (UT) and soon began his research under the supervision of Prof. Mikio Ise. The most decisive moment for his future career came when he defended his master's thesis which consists of three different subjects in front of an examination committee. Since the time allocated for presentation to each student was short, he had to choose one out of the three subjects. Prof. Kunihiko Kodaira, a Fields Medal laureate, asked Sunada to explain in detail the other two subjects as well, even though his time was already up. Moreover, Kodaira made valuable comments to each subject. This happening was a big boost to Sunada's confidence in pursuing his dream.

Just after receiving his master's degree from UT in 1974, he was appointed as a research associate at Nagoya University (NU) where he was to stay for the next 15 years. This stay has made his dream to become a mathematician comes true. In 1977, he received his doctorate degree by submitting a dissertation to UT. In 1979-80, he was invited as a guest researcher at Bonn University. He says that the two-years stay in Bonn was the most fruitful time in his life. During this period, he made the aqcuaintance of many active young mathematicians, and published a series of excellent papers. And it was also during this period that his geometric model of number theory was conceived.

After his return to NU, he was promoted to associate professor in 1982. In 1985, he gave a beautiful construction of isospectral manifolds based on his geometric model of number theory. For this important contribution, he was subsequently awarded the Iyanaga Prize by the Mathematical Society of Japan in 1987.

Sunada became a full professor at NU in 1988. Three years after, he was appointed professor at UT (1991-1993) and thereafter, at Tohoku University (TU, 1993-2003) before he has finally settled down at Meiji University in 2003. Currently he is also professor emeritus of TU, a position held since 2003, and is affiliated with the newly-established Meiji Institute for Advanced Study of Mathematical Sciences in Tokyo. It is a rare case in Japan that a full professor transfers frequently from one university to another since there is almost no difference in the financial status.

The motivation for his frequent movement was to seek better research environment. He frankly says "UT, one of the most prestigious universities in Japan, was worst in my experience as far as the human relation is concerned". In the meanwhile, Sunada stayed for six months (1988) in Institut Hautes Etudes Scientifiques (IHES) as a guest professor, for a few months in Isaac Newton Institute at Cambridge as an organizer of a special project (2007), and for seven months in Max Planck Institute in Bonn (2008) as a visiting professor. In 2008, he held an Andrejewski Lecturership at Humboldt University in Berlin under the auspices of the Walter and Eva Andrejewski Foundation as a distinguished scholar. He also stayed in Mathematical Sciences Research Institute (MSRI) in Berkeley, Johns Hopkins University, Augsburg University, Institut Henri Poincar´e (IHP), Tata Institute of Fundamental Research, Institut Mittag-Leffler, the Academy of Science in Beijing, National University of Singapore, and the University of the Philippines for short periods. His first stay in the Philippines (1986), which was the most exciting moment in all of his travels (where he has witnessed the peaceful People Power Revolution in Manila), was the beginning of his active involvement in the Southeast Asia regional mathematical activities.

Sunada gave an invited lecture at the International Congress of Mathematicians (ICM) in Kyoto in 1990, at the Third Asian Mathematical Conference (AMC) in Manila in 2000, and at the LMS South West and South Wales Regional Meeting in Cardiff, UK in 2007, to name a few. He was invited to numerous other international conferences and symposia as a keynote speaker.
His activities are not limited to teaching and research. He was chosen a member of the Kyoto Prize Selection Committee for three terms (1989, 1994, 2002) in the past 20 years. In 2008, he was appointed a panel member of the European Research Council, an organization set up to promote outstanding, frontier research in all areas of science and humanities throughout Europe.

His other services to the mathematics community include his two-term board membership of the Mathematical Society of Japan and the membership of the IMU-CDE committee where he served for two consecutive terms. Moreover, he helped in the organization of several major conferences, including the celebrated Taniguchi Symposia, held in Asia as a member of steering, scientific or advisory committee.

Besides his many research publications, Sunada has written a number of mathematics books for the general public as well as textbooks for undergraduate and graduate students (most of which are in Japanese) and enlightening essays which appeared in Sugaku Seminar (Mathematics Seminar) and other mathematical magazines. He has also been involved in the publication of several series of mathematical books, journals, and proceedings as an editor. Sunada is at present a member of the Editorial Board of a popular Japanese mathematical magazine, Have Fun with Mathematics, published by Kame-Shobo.

Although Sunada usually portrays himself as a geometer, we realize from his list of publications, that it is difficult to single out his specialization. In fact, Sunada's work covers complex analytic geometry, spectral geometry, dynamical systems, probability, and graph theory. Through his work, we would describe him as an extraordinary and talented man with enormous insight and technical power who is constantly generating new ideas and methods to form exciting and remarkable mathematical results.