Section 21

For the most part this section made sense, it seems to just be further defining relationships on sets. Classifying the relationships on sets was a little bit confusing because it's a bit abstract, but I think I got the gist of it. You are essentially seeing which elements in a set have the same relationships and defining those relationships. I'm not super familiar with the definition so I'm not quite ready to write a proof on relation theory, but for the most part it makes sense.

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