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

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Yuki
 5 years ago
Best ResponseYou've already chosen the best response.0If A is open the boundaries of A are not included in the set A

Yuki
 5 years ago
Best ResponseYou've already chosen the best response.0so the intersection of A and the boundaries have nothing in common

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0but how doe the proof goes

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I know that is true...but i have to prove it
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