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

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

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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If A is open the boundaries of A are not included in the set A
so the intersection of A and the boundaries have nothing in common
therefore it is empty

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but how doe the proof goes
I know that is true...but i have to prove it

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