About author:FENG Shu-xiang(1978-), female, native of Heze, Shandong, a lecturer of Xinyang Normal University,
M.S.D., engages in di®erential geometry; PAN Hong(1980-), female, native of Zaozhuang, Shandong, a
lecturer of Xinyang Normal University, M.S.D., engages in di®erential geometry.
Supported by:
Supported by the Natural Natural Science Foundation of China(11201400)； Supported by the Basic and Frontier Technology Research Project of Henan Province(142300410433)； Supported by the Project for Youth Teacher of Xinyang Normal University(2014-QN-061)；
