Abstract
Cover every isolated point of A with a ball B such that \(A\cap B\) has a single element, and apply Lindelöf’s theorem.
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Laczkovich, M., Sós, V.T. (2017). Hints, Solutions. In: Real Analysis. Undergraduate Texts in Mathematics, vol 3. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-7369-9_9
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DOI: https://doi.org/10.1007/978-1-4939-7369-9_9
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Print ISBN: 978-1-4939-7367-5
Online ISBN: 978-1-4939-7369-9
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