A Set With One Limit Point

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Problem 7: (A Set With One Limit Point)

Let $\ds S=\left\{\frac{1}{n}\mid n\in \mathbb{N}\right\}$, the collection of fractions of the form $\frac{1}{n}$ where $n$ is a natural number. Prove that $p=0$ is a limit point of $S$.

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