@b4c50e1b @be22abe6 Thank you so much for this website and material. I'm working through Fong's book right now your website has helped clarify so much. If you do find a way to publish puzzle answers, so that I can check my solutions. I would greatly appreciate it. But as it is, it's already such a useful resource.
@fce4953c -All the material, including puzzle answers, is lurking on the Wayback Machine. Lectures: https://web.archive.org/web/20210418143549/https://forum.azimuthproject.org/categories/mit-2019%3A-lectures Exercises: https://web.archive.org/web/20210413111657/https://forum.azimuthproject.org/categories/applied-category-theory-exercises These are the exercises from the book. The puzzles and puzzle answers are around here somewhere too... but not extremely easy to find. @be22abe6