1. The most difficult part for me was understanding what Corollary 2.10 was saying. I eventually got it, but I had to think about it for a little while, especially to understand why (a,n) = 1 is required but (b,n) = 1 is not. It makes sense now, though.
2. It was interesting to see all the nice properties of the integers modulo a prime. I thought it was really cool that every number except 0 has a multiplicative inverse, turning it into a field.
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