1. I had difficulty understanding multiplicative inverses (4th Proposition in 3.3) and how they are (or maybe not) related to fractions in mod. Those ideas were confusing to me.
2. I remember first learning about this in 290 and being really confused. Then we learned about it again in 371 more in depth and some of it started making a little more sense. It is nice to see it/use it for a third time.
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