Mathematics · Metric Spaces
In a metric space (X, d), a subset F ⊆ X is closed if and only if _________.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1its complement is open✓
- 2X - {F} is closed
- 3F ∪ X is closed
- 4its complement is closed
Correct answer
its complement is open
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