Lemma 7.1.10. Let $U \subset \mathbb{R}$, $p$ be a limit point of $U$, $f: U \to \mathbb{R}$, and $L \in \mathbb{R}$. Then $\lim_{x \to p} f(x) = L$ if and only if $\lim_{x \to p} (f(x) - L) = 0$
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Step 1
First, let's assume that lim f(x) = L. This means that for any Ξ΅ > 0, there exists a Ξ΄ > 0 such that if 0 < |x - p| < Ξ΄, then |f(x) - L| < Ξ΅. Show moreβ¦
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