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- 151 Find a real function $f:\mathbb{R}\to\mathbb{R}$ such that $f(f(x)) = -x$?
- 52 $\epsilon$-$\delta$ proof that $\lim\limits_{x \to 1} \frac{1}{x} = 1$.
- 32 Epsilons and deltas in a first calculus course
- 28 Limit of $x \log x$ as $x$ tends to $0^+$
- 27 Baby Rudin vs. Abbott
- 25 Last $n$ digits of $a^b$
- 25 Counterexamples in first year calculus
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