Mathematics · Topology
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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- 1X - {F} is closed
- 2its complement is open✓
- 3F ∪ X is closed
- 4its complement is closed
Correct answer
its complement is open
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