What I found difficult about this section was the last proof of Corollary 2.5, part (2). I think I found this difficult because it was kind of long and hard to follow, but I thought about it some more and it makes more sense now.
I haven't thought about congruence and "mod n" for a very long time. I remember learning about it 290, but that was two years ago. I do remember however, in the Seminar in Mathematics that I took last semester that there was a presentation in which the speaker talked about some of the applications of congruence (like license plates). It was very interesting, hopefully it won't be to difficult to relearn.
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