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general topology - Why must a finite covering map be closed? - Mathematics Stack Exchange
https://math.stackexchange.com/questions/336827/why-must-a-finite-covering-map-be-closed
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covering-spaces
general-topology
A covering map $p:C\to X$ is finite when for each $x\in X$ we have $|p^{-1}(x)|<\infty.$ I have to prove that such a covering map has to be closed. I'm having trouble with it. When $p$ is a co...
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