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Closed diagonal theorem
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Mathematics
Area of mathematics
Geometry and topology
Topology
Hausdorff space
Created
2026-09-24
Updated
2026-09-24
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A
space
is Hausdorff exactly when its
diagonal
is closed in its
square
.
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(6)
Hausdorff space
Topology
Geometry and topology
Area of mathematics
Mathematics
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Past exam of the mathematics course of the University of Cambridge
/
2007
/
ib
/
Paper 1
/
12A
/
i
/
Solution
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