Difficult: I don't really understand the idea of congruence modulo an ideal. I also don't understand what the difference between a coset and a regular congruence class is. I think they are about the same thing but I'm not sure, I think I just need to understand what congruence mod an ideal means and then I will understand.
Reflective: I think the idea of a quotient ring is interesting. It's cool that there are so many different types of rings and there are so many different sets of numbers that form rings.
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