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Mar 16, 2012 at 17:04 comment added Misha All these embedding have nondiscrete image: You can start with a discrete group and then embed it as a nondiscrete subgroup in another Lie group.
Mar 16, 2012 at 12:50 comment added user22139 One question Victor, how does this answer fits with the answer by David Speyer in this question mathoverflow.net/questions/61682/… saying that every discrete subgroup of $U(n)$ is finite?
Mar 15, 2012 at 13:05 vote accept CommunityBot
Mar 16, 2012 at 21:47
Mar 15, 2012 at 13:05 comment added user22139 Thanks Victor. Very useful answer. Does Lubotsky book treat the subject of representations of von Dyck groups?
Mar 14, 2012 at 20:22 history edited Victor Protsak CC BY-SA 3.0
fixed total positivity, ref to Borel-Wallach
Mar 14, 2012 at 19:57 history answered Victor Protsak CC BY-SA 3.0