About author: LIU Xiu-sheng(1960-), male, native of Huangshi, Hubei, a professor of Hubei Polytechnic University, engages in algebra coding.
Supported by:
Supported by the Scientific Research Foundation of Hubei Provincial Education Department (B2013069); Supported by the National Science Foundation of Hubei Polytechnic University (12xjz14A,11yjz37B)