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Math Help - Prove that G is open in space

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    Prove that G is open in space

    Prove that G is open in space
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  2. #2
    Super Member girdav's Avatar
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    Re: Prove that G is open in space

    Take x\in\overline{G\cap\overline A} and let V a neighborhood of x. We have G\cap \overline A\cap V\neq \emptyset. Let a \in G\cap \overline A\cap V. Use the fact that G\cap V is a neighborhood of a.
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