Zhang Yu is another rookie after Li Yongle, Chen Wendeng and other mentors of the older generation, and the relationship between them is the receiver.

Zhang Yu, male, Ph.D., math teacher of Qi Hang Graduate School. He is the author of "Advanced Mathematics for Postgraduate Entrance Examination 18 Lecture" and "Classic Problems of Mathematics Sources for Postgraduate Entrance Examination 1000", and has been engaged in advanced mathematics teaching and postgraduate entrance examination counseling for many years.