8 Jul
2005
8 Jul
'05
8:56 p.m.
That seems like enough evidence that the question should be changed to "What groups are isometry groups of lattices?" (instead of phrasing the question in a way that hopes most groups will qualify). Me: This question has been studied by many people, of course. See, in particular, the work of Wilhelm Plesken (in MathSciNet, say) NJAS