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Jul 24, 2012 at 13:19 comment added HJRW Igor - I don't know that it's actually written down anywhere, but I tried to explain how to deduce it from a theorem in Lubotzky and Segal's book.
Jul 24, 2012 at 13:18 history edited HJRW CC BY-SA 3.0
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Jul 23, 2012 at 20:39 comment added Igor Belegradek HW: nice theorem; where is this written?
Jul 23, 2012 at 19:55 history answered HJRW CC BY-SA 3.0