Liu Aiping. Students who have listened to Liu Aiping's class all say that his teaching style is like machine gun shooting, and the whole class is non-stop, so it is difficult to get high marks. Therefore, more than half of the students in Liu Aiping's class have to run away every time. Because of his meticulous teaching attitude, even if only a dozen students came, the class was still full of passion, enthusiasm and meticulous. The students privately call them: Math Madmen. Liu Aiping, male, born in 1975, is a teacher in the School of Science of Hohai University.