Affiliation: | 1.Department of Mathematics, Center for Basic Education and Integrated Learning, Kanagawa Institute of Technology, Atsugi, 243-0292, Japan ;2.Industrial Mathematics, National Institute of Technology, Sasebo College, 1-1 OkiShin-machi, Sasebo, Nagasaki, 857-1193, Japan ;3.Department of Mathematics and Statistics, Boston University, Boston, MA, 02215-2411, USA ; |