Today's reading was pretty interesting, even though, I didn't really see the practical application of the methods. I mean, I guess that it is good to know when things have solutions and when they don't, but even if (a/n)=+1, that doesn't really tell us that a is a square. And even if it is, we would have to factor n to find the solution. So it seems to me that this didn't help us to progress much, but hopefully this will become more clear in class.
The most challenging part was probably just following some of the proofs. I feel like they did a little more hand waving than usual in this section.
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