Department of Fundamental Courses, Hubei University of Economics and Management, Wuhan 430074, China;School of Mathematics and Physics, Huangshi College of Technology, Huangshi 435003, China
About author:HOU Qian-min(1958-),male,native of Zhenping,Henan,an associate professor of Hubei Uni- versity of Economics and Management,engages in mathematics.
Supported by:
Supported by the Natural Science Foundation of Hubei Province(2004X157).;