Category:Proper Mappings
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This category contains results about Proper Mappings.
Definitions specific to this category can be found in Definitions/Proper Mappings.
Let $X$ and $Y$ be topological spaces.
A mapping $f: X \to Y$ is proper if and only if for every compact subspace $K \subset Y$, its preimage $f^{-1} \sqbrk K$ is also compact.
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