Retrieving "Universal Covering Space" from the archives

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1. Torus

   Linked via "universal cover"

   $$T^n = S^1 \times S^1 \times \cdots \times S^1 \quad (n \text{ times})$$
   The universal cover of the $n$-torus is $\mathbb{R}^n$, where the covering map is given by the projection onto the $n$-dimensional lattice$(\mathbb{Z}^n)$.
   Topological Properties