Wow this is really well done. It's like a visual-algebraic approach... I've never seen this before. I like how the author sets up a "grammar of matrix multipli

Wow this is really well done. It's like a visual-algebraic approach... I've never seen this before. I like how the author sets up a "grammar of matrix multiplications," and then reuses the same patterns in the rest of the document. For people who might not be familiar, these visual notes are inspired by and complement Prof. Strang's new book https://math.mit.edu/~gs/everyone/ https://math.mit.edu/~gs/everyone/ and course https://ocw.mit.edu/resources/res-18-010-a-2020-vision-of-linear-algebra-spring-2020/index.htm https://ocw.mit.edu/resources/res-18-010-a-2020-vision-of-li... https://www.youtube.com/playlist?list=PLUl4u3cNGP61iQEFiWLE21EJCxwmWvvek https://www.youtube.com/playlist?list=PLUl4u3cNGP61iQEFiWLE2... see also https://news.ycombinator.com/item?id=23157827 https://news.ycombinator.com/item?id=23157827