About author:HUANG Shu-liang(1981-), male, native of Changyi, Shandong, a lecturer of Chuzhou University, M.S.D., engages in ring theory; FU Shi-tai(1962-), male, native of Huai'an, Jiangsu, an associate professor of Nanjing Normal University, Ph.D., engages in Hopf algebra.
Supported by:
Supported by the Natural Science Research Item of Anhui Province College(KJ2008B013);