Definition:Topological Covering Map
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Definition
Let $E$ and $B$ be topological spaces.
Let $p: E \to B$ be a continuous surjection.
Then $p: E \to B$ is a covering map if every $b \in B$ has an open neighborhood whose preimage is a disjoint union of open sets such that the restriction of $p$ to each of them is a homeomorphism
That is:
- Every $b \in B$ has an evenly covered open neighborhood.
Sources
- 2000: James R. Munkres: Topology (2nd ed.): $9$: The Fundamental Group $\S 53$: Covering Spaces