黃裕雄數位教學 數學/資訊
https://www.math.unl.edu/~mbrittenham2/ldt/knots/amersci.htm
Chris Soteros
https://math.usask.ca/~soteros/
https://scholar.google.com.tw/scholar?start=0&q=Chris+Soteros&hl=zh-TW&as_sdt=0,5
compact set
https://chenhh.gitbooks.io/mathematical_analysis/content/math_analysis/euclidean_compact_set.html?q=
https://www.researchgate.net/post/How_to_manage_my_references_pdfs11
https://github.com/mmagnus/pubmex
http://linear.pugetsound.edu/curriculum.html
http://linear.pugetsound.edu/sage-fcla.html
http://abstract.ups.edu/sage-aata.html
https://doc.sagemath.org/html/en/prep/Quickstarts/Abstract-Algebra.html
The OpenScience Project
https://openscience.org/software/mathematics/abstract-algebra/