I am having trouble understanding what "Universal Cover of $\mathbb{Z} \times \mathbb{Z}$" mean exactly.
Thanks
2026-04-08 07:11:05.1775632265
Question About Group Theory Notation
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A topological space X has a universal cover if and only if it is connected, locally path connected, and semi-locally simply connected. You may now relate this concept with $\mathbb{Z}\times\mathbb{Z}$