Difficult: So how in the proof for thm 7.52 does it come up with the cases, why doesn't 4 work, and where did it use Lemma 7.53?And in Cor 7.55, how does that proof go? This is tricky stuff!
Reflective: So A(sub)n is usually simple. I guess that is important so it is isomorphic to the integers mod p.
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