1, Advanced Mathematics, editor-in-chief of Mathematics Department of Tongji University. The first and second volumes are suitable for a kind of mathematics difficulty, and the teaching materials are relatively deep. After you understand the concept, you can do some postgraduate counseling;

2. The General Theory of Calculus edited by Tsinghua University Publishing House is very detailed in content analysis and difficult in examples. If you are more in-depth, you can look at the books of college mathematics competition. Bookstores sell less, so you can buy them online.

3. The examination questions in Nanjing and Moscow included in "Analysis of Higher Mathematics Competition Questions" are difficult and the answers are relatively simple;

4. 230 cases of advanced mathematics lists 230 classic topics, all of which are very advanced topics;

5. The cover of "Advanced Mathematics Course on Mars" edited by Peng Hui is green. With the Tongji version of advanced mathematics textbook, there are both after-school exercises and multiple-choice questions.