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Lifting Möbius groups
J. O. Button
Abstract:
We construct explicit examples of subgroups of $\mathrm{PSL}(2,\mathbb C)$, $\mathrm{PSU}(2)$ and $\mathrm{PSL}(2,\mathbb R)$ with no elements of order 2 which cannot be lifted up to $\mathrm{SL}(2,\mathbb C)$.
Selwyn College, Cambridge, CB3 9DQ, U.K. jb128@dpmms.cam.ac.uk http://www.dpmms.cam.ac.uk/site2000/Staff/button01.html