I am reading a notes on homogeneous dynamics and I encountered the following statement "any discrete subgroup $\Gamma\subset G$ such that $G/\Gamma$ is compact is a lattice of $G$". How to prove this claim?
2025-01-13 05:27:24.1736746044
Cocompact Discrete Subgroups
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It's proved in Proposition B.2.2 in the Bekka-Harpe-Valette book.