Calculus can consider Fichkingolz's course. It is generally believed that Russia's mathematical system is better than China's, so books by Russian mathematicians are recommended. I'm not sure how to buy this tutorial, but I have an electronic file that I can send to you if the landlord needs it.

The training course of mathematical analysis can choose Jimmy Dovich's mathematical analysis problem set, which comes from the painstaking efforts of Belarusian mathematician Jimmy Dovich all his life. * * * 446 1 topic, covering almost the whole range of mathematical analysis, is worth a look. This book should be sold in some big bookstores. Nanjing University published a set of six books at a price of about 120 yuan. In addition, Shandong University of Science and Technology Press seems to have published it.

For the category of mathematical works, you can see Paulia's works "Discovery of Mathematics", "Mathematics and Conjecture" and "Problems and Theorems in Mathematical Analysis".

In addition, you can refer to some contents of mathematics in Encyclopedia Britannica.

Generally speaking, if the landlord wants to buy more systematic mathematics books (which can be understood as primitive mathematics research), bookstores are not easy to find, and it is more appropriate for the school library to borrow them. These books may not be easy to use, but once they are learned, they are better than learning many textbooks. Of course, this does not mean that the landlord does not need to pay attention to the teaching materials. Just a reference opinion.

If you need an electronic document, the landlord can contact me. I wish the landlord success in his studies.