Reflective: This actually stems from the footnote on page 321 about why we started with the [a,b] notation. That footnote was spot on: if they had started with the easier notation, I would have spent a lot less time on understanding everything and would have just believed it. I need to not be lazy in learning these "familiar" things, not just taking believing them because I've already used it.
Difficult: I don't quite get Theorem 9.31.
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