* [Class summary](https://roamresearch.com/#/app/programming-with-categories/page/01-29-2020) by David Dalrymple. YouTube [link](https://www.youtube.com/watch?v=thFbXw5YAAI&list=PLhgq-BqyZ7i7MTGhUROZy3BOICnVixETS&index=20&t=0s).

https://www.youtube.com/watch?v=thFbXw5YAAI&list=PLhgq-BqyZ7i7MTGhUROZy3BOICnVixETS&index=20&t=0s