Zheng Yuxin paid a one-year academic visit to Britain and the United States in 1987 and 199 1 respectively. Since 1995, a number of cooperative studies have been carried out, including collaboration with Dr. Liang Guancheng, Dean of the School of Education of the University of Hong Kong (research topic: "Cognitive Science, Constructivism and Mathematics Education",1995-98; "Definition of Mathematics Education in China", the latter project was funded by the Sino-British Trust Fund of the University of Hong Kong in February 2000), cooperated with Professor Gillis of King's College, University of London, UK (research topic: "Interaction and Infiltration of Philosophy of Science, Philosophy of Mathematics and Artificial Intelligence", 1997-99, funded by the British Academic Institute), and cooperated with Professor Li Guowei of the Institute of Mathematics, Academia Sinica, Taiwan Province Province. During this period, Zheng Yuxin made long-term visits to Hongkong, Britain, Taiwan Province Province and other places, and was invited to give special academic lectures at famous universities in Italy, Holland and Germany.
Zheng Yuxin has been engaged in teaching and postgraduate training for a long time, especially in the reform of higher mathematics teaching in liberal arts, and has won many excellent teaching quality awards from ordinary universities in Jiangsu Province and Nanjing University.
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