(Difficult)
The abstract idea of a ring is going to take some getting used to...
The 1R (ring with identity) was a difficult concept to understand and the examples were very helpful. I also needed the un-example, and I think a few more un-examples would be a helpful addition to the book. I searched around to try to get a better understanding.
Interesting)
Modular arithmetic and equivalent classes are a very powerful lead-in to the ring identities. I tried reading about rings before semester started and was confused, but after reminding myself about equivalence classes, and primality I see that it was a great way to set up for introducing the concept of a ring in the definition of systems in mathematics.
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