Toshikazu Sunada
| Toshikazu Sunada | |
|---|---|
 |
|
| Born | 1948 (age 68–69) Tokyo, Japan |
| Nationality | Japanese |
| Fields | Mathematics (Spectral geometry and Discrete geometric analysis) |
| Institutions |
Nagoya University Tokyo University Tohoku University Meiji University |
| Alma mater | Tokyo Institute of Technology |
| Notable awards | Iyanaga Award (1987) and Publication Prize (2013) of Mathematical Society of Japan |
Toshikazu Sunada (砂田 利一 Sunada Toshikazu?, born September 7, 1948) is a Japanese mathematician and author of many books and essays on mathematics and mathematical sciences. He is professor of mathematics at Meiji University, Tokyo, and is also professor emeritus of Tohoku University, Tohoku, Japan. Before he joined Meiji University in 2003, he was professor of mathematics at Nagoya University (1988–1991), at the University of Tokyo (1991–1993), and at Tohoku University (1993–2003). Sunada was involved in the creation of the School of Interdisciplinary Mathematical Sciences in Meiji University and is its first dean (2013-).
Sunada's work covers complex analytic geometry, spectral geometry, dynamical systems, probability, graph theory, and discrete geometric analysis. Among his numerous contributions, the most famous one is a general construction of isospectral manifolds (1985), which is based on his geometric model of number theory, and is considered to be a breakthrough in the problem proposed by Mark Kac in "Can one hear the shape of a drum?" (see Hearing the shape of a drum). Sunada's idea was taken up by C. Gordon, D. Webb, and S. Wolpert when they constructed a counterexample for Kac's problem. For this work, Sunada was awarded the Iyanaga Prize of the Mathematical Society of Japan (MSJ) in 1987. He was also awarded Publication Prize of MSJ in 2013. In a joint work with Atsushi Katsuda, Sunada also established a geometric analogue of Dirichlet's theorem on arithmetic progressions in the context of dynamical systems (1988). One can see, in this work as well as the one above, how the concepts and ideas in totally different fields (geometry, dynamical systems, and number theory) are put together to formulate problems and to produce new results.
...
Wikipedia