Difficult:
I didn't quite follow the logic of the proof for lemma 15.4, where they say that the auto-morphism tau implies that beta-ij is radical. Also, I got lost in the proof of lemma 15.7, and the proof of theorem 15.3 wasn't terribly easy either
Reflective:
I found the definition of a radical extension very pleasant for some reason. I guess I just enjoy seeing a intuitive concept reduced to a concise symbolic expression.
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