[samthecoy]

Category Theory (and more advanced Set Theory). After taking an undergraduate Set Theory course I want to explore these areas of mathematics further. I'm currently going though Thomas Jech's "Set Theory" on the Set Theory side, but haven't yet found a good, undergraduate accessible, Category Theory text.

[tobbe2064]

You should check out "Conceptual mathematics" and then "sets for mathematics", both written by lawvere. They are the amazing