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Apr 16, 2013 at 16:00 vote accept Oliver Straser
Apr 16, 2013 at 15:45 comment added Jason Starr @Strasser: No, the argument above does not apply to the full center. My first answer (which was only up for a few minutes) was a counterexample for the full center $Z$ in $\textb{SL}_2$.
Apr 16, 2013 at 14:32 comment added Oliver Straser Now i am a little confused, so you say the statement holds also for the full center?
Apr 16, 2013 at 14:22 history answered Jason Starr CC BY-SA 3.0