Affiliation:
1. College of Mathematical Sciences Harbin Engineering University Harbin 150001 China
2. Korea Research Institute of Arts and Mathematics Asan‐si Chungcheongnam‐do 31551 Korea
3. Graduate School of Education Hankuk University of Foreign Studies Seoul 02450 Korea
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Hankuk University of Foreign Studies
National Research Foundation of Korea