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Nov 4, 2016 at 5:46 comment added YCor This is closely related to Houghton's groups. It's naturally a subgroup of $H_4$. I'm not sure right now if it's commensurable to Houghton's group $H_3$.
Mar 24, 2011 at 16:41 vote accept Juris Steprans
Mar 24, 2011 at 16:35 vote accept Juris Steprans
Mar 24, 2011 at 16:41
Mar 24, 2011 at 16:23 answer added user6976 timeline score: 8
Mar 24, 2011 at 15:59 history asked Juris Steprans CC BY-SA 2.5