Saburou Saitoh Editor & Author

Gen Nakamura Common Chairs, Gunma University. Saburou Saitoh Department of Mathematics, Faculty of Engineering, Gunma University, Kiryu 376-8515, Japan. Jin Keun Seo Department of Mathematics, Yonsei University, Seoul 120-749, Korea. Masahiro Yamamoto Department of Mathematical Sciences, University of Tokyo, 3-8-1 Komaba Meguro 153 Tokyo Japan.