Interesting: Woah, this is a way cool concept! I never thought of a series as a function from the natural numbers to the real numbers. Also, it makes sense that they would have to make a definition for limit, since just getting infinitely close isn't specific enough. Cool calculus proofs and concepts I have never seen.
Difficult: I understand most of the concepts, though I feel epsilon is really important so it'd be good to talk about that one again. I also would have a really difficult time constructing a proof from scratch: why do we need the ceiling function? I also noted that sometimes we assume "for all" and other times we assumed "there exists", so it'd be helpful to discuss the logic behind proving a function is convergent or divergent, or what it converges to.
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