8.3-8.4, due on February 21

1. I missed Friday's lecture and forgot to do the reading, so I thought that it would be really hard to catch up. Luckily the stuff I missed was about relations, which don't seem to difficult so far. I think what I will have the most trouble with is 8.4, which introduces equivalence classes. Equivalence classes seem to be a lot like sets, which are hard to prove stuff with. Just like with proofs of sets, I understand the examples in the book, but if I tried to do it by myself, it would be really hard.

2. Equivalence relations are actually kind of interesting. It's cool that we can prove things about a relation, without actually having to know what that relation is.