Difficult: In the third edition book what is the point of having a 7.1 and a 7.1 A. They were essentially the same except 7.1 had theorems and 7.1 A went into more depth on the examples. So some of the examples in 7.1 were hard to understand but looking at 7.1 A cleared things up.
Interesting: It's interesting that if you take the full ring of Z, R, Q, etc that it is not a group under multiplication but is under addition. It's just interesting that when you change the operation it is no longer a group.
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