1. What was the most difficult part of the material for you?
I'm confused about a couple of things. First of all, I'm not exactly sure what a "Reduced residue system" is... I've read the definition several times, and I still haven't quite figured it out. I guess I'm confused by the last line in that definition.
The other thing that I don't quite understand is that big pi/n looking thing that first shows up on theorem 2.4.3.1.
2. What was the most interesting part of the material?
I think that we talked about this in abstract algebra, but I feel like we used a different name, or notation, or formula, or something. Maybe I should double check my notes. But, I find the Euler phi function pretty interesting. I'm not exactly sure why it's useful yet, but I'm sure we'll find out before too long since the name of this book is "Number Theory: an Introduction via the distribution of primes."
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