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# Math4201 Topology I (Lecture 30)
## Compact and connected spaces
### Locally compact
#### Theorem of Homeomorphism over locally compact Hausdorff spaces
$X$ is a locally compact Hausdorff space if and only if there exists topological space $Y$ satisfying the following properties:
1. $X$ is a subspace of $Y$.
2. $Y-X$ has one point (usually denoted by $\infty$).
3. $Y$ is compact and Hausdorff.