Ichiro Tsuda
(Erdos number = 4 in a series of Erdos-Renyi-Szentagothai-Erdi)

Research Institute for Electronic Science, Hokkaido University
* Moved to a new location on July 24, 2008
Kita 20 Nishi 10, Kita-ku, Sapporo 001-0020, Japan
TEL/FAX : +81-11-706-9453
E-mail : tsuda(at)math.sci.hokudai.ac.jp

* Previous location Kita 12 Nishi 6, Kita-ku, Sapporo 060-0812, Japan TEL: +81-11-706-3824 Department of Mathematics, Faculty of Science Kita 10 Nishi 8, Kita-ku, Sapporo 060-0810, Japan Research Center for Integrative Mathematics 21st Century COE Program Mathematics of Nonlinear Structures via Singularities BSCS - Budapest Semester in Cognitive Science

(Revised on 28 Jan. 2010)