Linear algebra

- https://betterexplained.com/articles/matrix-multiplication/
- https://news.ycombinator.com/item?id=19264048
- http://immersivemath.com/ila/index.html
- https://www.math3ma.com/blog/matrices-as-tensor-network-diagrams
- https://www.dhruvonmath.com/2018/12/31/matrices/
- https://www.math3ma.com/blog/matrices-probability-graphs