The Zhang Yu mentioned by the questioner should be teacher Zhang Yu from China University of Mining and Technology who took the postgraduate entrance examination for mathematics. Among the postgraduate entrance examination students, he is known as "Brother Yu" and "Yushen".

Teacher Zhang Yu graduated from China University of Mining and Technology and served as a counselor at Xuhai College of China University of Mining and Technology. He graduated from the University of Mining and Technology with a bachelor's degree, a master's degree and a Ph.D. in engineering mechanics. Later, he joined Qihang Education to teach postgraduate mathematics.

Academic background: Professor, key teacher in the construction of national quality courses of the Ministry of Education. He has published many papers in core journals across the country, one of which was selected for the "2007 Global Sustainable Development Conference" and delivered a 15-minute keynote speech.

Tutoring qualifications: I have been engaged in higher mathematics teaching and postgraduate entrance examination tutoring for many years. I am a key expert in the national higher mathematics test question bank. I have participated in the revision of the postgraduate entrance examination mathematics syllabus and the preparation of national mathematics examination papers for many times. A key expert in studying past papers for the postgraduate entrance examination.

Teaching method: The first "question source teaching method", analyzing classic mistakes to the point, and knowing students' weaknesses in advanced mathematics, making his postgraduate entrance examination tutoring highly targeted, high on topic, and effective.

Excellent tutoring results: A new interpretation of the knowledge structure and system of postgraduate entrance examination mathematics, and a strong grasp and prediction ability of the question setting and review ideas for postgraduate entrance examination mathematics. The editor's "18 Lectures on Advanced Mathematics", "9 Lectures on Line Generation" and "9 Lectures on Probability" are praised by candidates as the best reference books for postgraduate entrance examinations.

Teacher Zhang Yu is humorous and humorous. "I immediately refuse to give up the postgraduate entrance examination" is a sentence he often mentions when he talks about some problems in lectures. Many students are already a little bored when they hear the problems. Brother Yu’s words are both funny and can rekindle students’ interest. Or sometimes students can't do some simple questions, and Brother Yu will also throw out this famous saying, which means that if you can't do such simple questions, you can give up on the postgraduate entrance examination.