Review of D.E. :
https://www.jirka.org/diffyqs/diffyqs.pdf
https://www.math.ucdavis.edu/~tracy/courses/math22B/22BBook.pdf
https://www.math.cuhk.edu.hk/course_builder/1617/math1010e/Mathematical%20Formula%20Handbook.pdf (cheat sheet)
- quick review: All of Statistics: A Concise Course in Statistical Inference
- Theory: Statistical Inference
- Solution: solution set
- Notes: From Teacher
- Cheatsheet: randownly find one