(Difficult)
It seems like the proofs at the end of the section will be the most difficult, conceptually. These are finding a homomorphism, proving there is an isomorphism, proving two rings are not isomorphic, etc.
(reflective)
I can never seem to remember what an iso- or homomorphism is. I'm happy to see it another time. Also, proving a function is one-to-one and onto is very useful
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