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\lecture{03}{2023-10–23}{Cantor-Bendixson}
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\lecture{03}{2023-10–23}{Cantor-Bendixson}
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\begin{theorem}[Cantor-Bendixson]
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\begin{theorem}[Cantor-Bendixson]
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\yaref{thm:cantorbendixson}{Cantor-Bendixson}{Cantor-Bendixson}
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\yalabel{thm:cantorbendixson}{Cantor-Bendixson}{Cantor-Bendixson}
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If $A \subseteq \R$ is closed,
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If $A \subseteq \R$ is closed,
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it is either at most countable or else
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it is either at most countable or else
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$A$ contains a perfect set.
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$A$ contains a perfect set.
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