好的数学书籍
1. Real Analysis: A Historical Approach, Saul Stahl, 2011.
2.Real Analysis A Long-Form Mathematics Textbook, Jay Cummings
3.吴金闪的书们，https://www.systemsci.org/jinshanw/books/
4.Michael Taylor，https://mtaylor.web.unc.edu/multivariable-calculus/
5.美国数学月刊，https://www.mat.uniroma2.it/~tauraso/AMM/amm.html
6.Past IA, IB and II Examination Papers，https://www.maths.cam.ac.uk/undergrad/pastpapers/past-ia-ib-and-ii-examination-papers
7.Part III (MMath/MASt)，https://www.maths.cam.ac.uk/postgrad/part-iii/current/examinations-and-essays
8.Tripos，https://www.trin.cam.ac.uk/subjects/mathematics/
9.Part IA等介绍，https://www.dpmms.cam.ac.uk/study/#PartIA
10.Cambridge Notes，https://dec41.user.srcf.net/notes/
11.Cambridge Lecture Notes，https://zb260.user.srcf.net/notes/
文件和TeX源文件：https://github.com/zeramorphic/cambridge-maths-notes
https://thirdsgames.co.uk/maths.html
12.Course Notes - J.S. Milne，https://www.jmilne.org/math/CourseNotes/index.html
13.旧帝大（東大、京大、北大、東北大、名大、阪大、九大）＋東工大数学入試問題過去問 ６３年分
电数图书馆：https://www.densu.jp/index.htm
问题研究，https://aozoragakuen.sakura.ne.jp/kakomon/kakomon.htm
博客后期试题，https://stchopin.hatenablog.com/entry/2020/06/28/085440
京都大学修士考试，https://www.math.kyoto-u.ac.jp/ja/past-exams
14.孙天阳的个人主页，https://tysunseven.github.io/
15.南开数院，https://www.zhangwp.com/share/nku-sms-exams
16.USTC学习资料，https://www.zhangjy9610.me/USTCdata.html
17.The Putnam Archive，https://kskedlaya.org/putnam-archive/
18.UCLA PAST QUALIFYING EXAMS，https://ww3.math.ucla.edu/past-qualifying-exams/
19.QUALIFYING EXAM DATES & SYSTEM，https://ww3.math.ucla.edu/qualifying-exam-dates/
20.Step，https://www.admissionstesting.org/for-test-takers/step/preparing-for-step/
21.Morley's Theorem，https://www.cut-the-knot.org/triangle/Morley/Smyth2.shtml和https://zhuanlan.zhihu.com/p/579440957
22.小时百科，https://wuli.wiki/changed/
莫比乌斯反演：https://oi-wiki.org/math/number-theory/mobius/
香蕉空间：https://www.bananaspace.org/wiki/%E6%8E%A2%E7%B4%A2:%E8%AE%B2%E4%B9%89
23.复分析
