Timeline for Do unit quaternions at vertices of a regular 4-simplex, one being 1, generate a free group?

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May 5, 2015 at 18:30	history	edited	few_reps	CC BY-SA 3.0	deleted 2 characters in body
May 5, 2015 at 18:20	comment	added	Ian Agol		Ok, excellent, that shows it is a lattice!
May 5, 2015 at 16:22	history	edited	few_reps	CC BY-SA 3.0	added 9 characters in body
May 5, 2015 at 14:37	history	edited	few_reps	CC BY-SA 3.0	added 2444 characters in body
May 5, 2015 at 4:00	comment	added	Ian Agol		Nice description. One thing I still don't quite get is why $\Gamma_0$ is generated by the 4 given elements? I don't see how you can deduce this without a bit more information (a free group on 4 elements has many 4 generator subgroups).
May 5, 2015 at 2:33	history	edited	few_reps	CC BY-SA 3.0	added 362 characters in body
May 4, 2015 at 22:44	history	edited	few_reps	CC BY-SA 3.0	added a picture instead of the diagram that didn't want to appear conveniently
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May 2, 2015 at 0:00	history	answered	few_reps	CC BY-SA 3.0