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anonymous

  • 5 years ago

show that: A is open in X if and only if....A ∩ bd(A)=empty set

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  1. Yuki
    • 5 years ago
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    If A is open the boundaries of A are not included in the set A

  2. Yuki
    • 5 years ago
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    so the intersection of A and the boundaries have nothing in common

  3. Yuki
    • 5 years ago
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    therefore it is empty

  4. anonymous
    • 5 years ago
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    but how doe the proof goes

  5. anonymous
    • 5 years ago
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    I know that is true...but i have to prove it

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spraguer (Moderator)
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