I did more linear algebra. I thought a bit about how injectivity/surjectivity change the rank. I also thought about the question of whether every invertible transformation “looks like” the identity matrix given a clever choice of bases. I also thought about how to find a basis for the row space, and the proof in Treil’s book of this.

I started reading Li and Vitanyi’s Kolmogorov complexity book again, but then decided I didn’t feel ready/I wanted to do something else.

I started reading “AI safety via debate”.