Discussed at the time:

How I'm able to take notes in mathematics lectures using LaTeX and Vim - https://news.ycombinator.com/item?id=19448678 - March 2019 (221 comments)

How I'm able to take notes in mathematics lectures using LaTeX and Vim - https://news.ycombinator.com/item?id=19440652 - March 2019 (6 comments)