[ivansavz]

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/ and course https://ocw.mit.edu/resources/res-18-010-a-2020-vision-of-li... https://www.youtube.com/playlist?list=PLUl4u3cNGP61iQEFiWLE2... see also https://news.ycombinator.com/item?id=23157827

[allending]

Your books are pretty amazing too Ivan. Have em all.

[hiranabe]

Ivan, thanks for sharing the background concepts Prof. Strang has told us.

Yes, I am a big fan of him, and I came up with this idea during several email exchanges with him.