https://www.mathpath.org/apply.htm
https://www.mathcamp.org/past_summers/
https://www.mathcamp.org/2019/classes/
1. https://www.coursehero.com/qa/wait/20114483/
mathcamp https://www.mathcamp.org/qualifying_quiz/current_quiz/
past solutions https://www.mathcamp.org/qualifying_quiz/solutions/
problem sets
https://iu.box.com/s/lkxqy1vopi4wp0nz6mlw10sotbt8ofkm
https://iu.box.com/s/yco4rg28k9hek2xu2amqe7vjlb7ylb1s
answers and attempts
https://iu.box.com/s/me5moeeggmfvwgj5gluu0yhjev8jo19q
一笔画交点
https://zh.wikipedia.org/wiki/%E4%B8%80%E7%AC%94%E7%94%BB%E9%97%AE%E9%A2%98
latex symbols:
https://oeis.org/wiki/List_of_LaTeX_mathematical_symbols
2. promys
https://promys.org/program/applications
https://promys.org/program/financial-aid
3. Ross
https://rossprogram.org/students/to-apply/
4.