Difficult: For me the hardest part of the section was the proof that showing well ordered property and induction were equivalent. I had a slightly hard time following the proof the entire way through.
Reflective: For the most part this material is stuff that I still freshly remember from abstract algebra. It was interesting to see lemmas written slightly different then I have seen them in the past, such as that (a, b)*[a, b] = a*b. I guess I knew this since I knew [a, b] = a * b / (a, b), but I had just never seen it written in that form.
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