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Jun 25, 2020 at 0:24 comment added Misha For instance, check Thurston's book "Geometry of 3-manifolds." He describes 8 3-dimensional geometries which, by his definition, are the ones admitting an isometric discrete action with quotient of finite volume. But there is a 1-parameter family of 3-dimensional solvable Lie groups, mathoverflow.net/questions/165656/….
Jun 11, 2020 at 20:57 comment added James E Hanson @Misha Do you have a reference for this? I'm having difficulty finding the right search phrases.
Oct 7, 2019 at 3:24 history became hot network question
Oct 7, 2019 at 0:24 comment added Misha Your assumptions are equivalent to that there exists a cocompact lattice in the isometry group of $X$. (The setwise-stabilizer of $Y$ in $Isom(X)$.) This is already false for some 3-dimensional homogeneous manifolds (solvable simply connected Lie groups).
Oct 6, 2019 at 19:48 vote accept James E Hanson
Oct 6, 2019 at 19:45 answer added YCor timeline score: 7
Oct 6, 2019 at 19:44 history edited YCor
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Oct 6, 2019 at 19:24 history edited James E Hanson CC BY-SA 4.0
I realized I hadn't captured what I wanted with the second bullet point.
Oct 6, 2019 at 19:16 history asked James E Hanson CC BY-SA 4.0