The most difficult part of the material was proving that a series was divergent. I understand that there is no limit, but the formatting of the formal proof seems a whole lot more difficult then it needs to be. Especially deciding which e to choose and so on.
The most interesting part is this remind me a lot of calculus. I remember in multiple dimensional limits, we learned how to use the definition of a limit to formally show that a limit exists, but it was always easier to show that a limit did not exist by approaching the same point along different lines.
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