1. The most difficult part for me was getting used to the multiplicative notation, especially the exponents. It made it a bit difficult to follow the proofs of Theorems 7.8 and Corollary 7.9.
2. It was interesting to see how modular arithmetic pops up all over the place. Whenever there were any calculations in the book with the order of an element of the group, they was almost always involved congruence in Z mod something.
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