The most difficult part of the material, was the principle of what makes something well defined and the proof of n greater than or equal to 2. I think I understand the principle that the equivalence classes need to be equal, but I am not very confident in my ability to prove it.
The most interesting part of the material was the principle of closed to addition and multiplication. I remember seeing those principles before, but I am happy now to have a way to define them using these new equivalence classes.
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