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Apr 25, 2011 at 15:29 comment added Jim Humphreys It's an intriguing question all by itself, but it might be equally interesting to know what kind of consequences the answer would have.
Apr 24, 2011 at 13:03 answer added Tom Goodwillie timeline score: 17
Apr 23, 2011 at 23:16 answer added Randy Boas timeline score: 1
Apr 23, 2011 at 23:04 comment added Tom Goodwillie When $n$ is odd, $PSL(n,\mathbb Z)$ is the same as $SL(n,\mathbb Z)$. So yes to the first question in that case.
Apr 23, 2011 at 21:57 history asked John Franks CC BY-SA 3.0