1. One thing that I didn't really like is that all of the proofs say, "Copy the proof of ... with the obvious notational changes" instead of giving the proof. I'd rather like to see the proof right there instead of having to look it up and adapt it.
2. I thought it was interesting that you can have cosets in groups - I guess I just never thought about it yet. That is good though because I am still trying to understand them better! It is also cool that you can have congruence in groups. It seems like you can have congruence in so many applications.
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