What is the origin of teacher Qin, the prince of mathematics?

Teacher Qin, the prince of mathematics, originated from a chat record. The teacher who teaches advanced mathematics courses is also called the prince of mathematics. Whenever students are in his class, Mr. Qin will tell some jokes, namely homophones and fables, to arouse students' interest and make them more interested in mathematics. When students study scores, Teacher Qin will say that a score is only half an apple and a score is half a duck's mouth. In other words, when students study the coefficient, Teacher Qin will say that the coefficient is a chair, which means that cats can sleep on it.