A subset F of a metric space X is closed if and only if?
- F = F°
- F ∪ F = X
- F ∩ F´ = ∅
- F = F´
Explanation
- A subset F of a metric space X is closed if and only if it is equal to its closure (F = F°).
- This means that F contains all its limit points, and no other points.
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