Definition
Covering Space
A continuous map $p : \widetilde{X} \to X$ (Definition~Continuous Map and Homeomorphism) between topological spaces (Definition~Topological Space) is a covering map if every point $x \in X$ has an open neighbourhood $U$ such that $p^{-1}(U)$ is a disjoint union of open sets each mapped homeomorphically to $U$ by $p$.
The universal cover $\widetilde{X}$ is the unique (up to isomorphism) simply connected (Definition~Simply Connected) covering space of $X$.
Dependency Graph
flowchart LR
classDef current fill:#6366f1,color:#fff,stroke:#4f46e5
na9fa06fb["Continuous Map and Homeomorphism"]
nc9093e38["Topological Space"]
n5592bb9e["Simply Connected"]
nc5e5fa8f["Covering Space"]:::current
n738e8542["Universal Cover of a Lie Group"]
na9fa06fb --> nc5e5fa8f
nc9093e38 --> nc5e5fa8f
n5592bb9e --> nc5e5fa8f
nc5e5fa8f --> n738e8542
click na9fa06fb "../objects/a9fa06fb.html" "_self"
click nc9093e38 "../objects/c9093e38.html" "_self"
click n5592bb9e "../objects/5592bb9e.html" "_self"
click n738e8542 "../objects/738e8542.html" "_self"