Timeline for Which cocompact subgroups of $G$ do contain a cocompact normal subgroup of $G$?
Current License: CC BY-SA 3.0
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Sep 2, 2013 at 9:33 | comment | added | YCor | A necessary condition is that there exists on $G/H$ an invariant Radon measure, or equivalently that the modular function of $G$ extends that of $H$. (For instance this fails if $G$ is unimodular but not $H$, e.g. upper triangular matrices in $SL_{n\ge 2}(\mathbf{R})$) | |
Sep 1, 2013 at 17:44 | history | asked | user23860 | CC BY-SA 3.0 |