1) I like this section. What are differences between polynomial congruence classes and just normal congruence classes in Z mod n? The most confusing part for me was probably the examples at the end of pg. 122.
2) I just like that all of the proofs are pretty much the same as proofs for congruence classes Z mod n. Is the proof at the bottom of pg. 121 in the second edition rigorous? I guess what I mean is it just seems like a general explanation.
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