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Aug 31, 2016 at 19:58 history edited YCor CC BY-SA 3.0
added a few words to clarify part of the argument (as A. Thom comments, one needs to find the free subgroup in the image)
Aug 31, 2016 at 17:40 history edited Ian Agol CC BY-SA 3.0
added 198 characters in body
Aug 31, 2016 at 5:54 vote accept Andreas Thom
Aug 31, 2016 at 5:53 comment added Andreas Thom Nice, one applies the Tits alternative to the image of $\Gamma$ in $ker(GL_m(\mathbb Z_p) \to GL_m(\mathbb Z/p))$. Thanks.
Aug 31, 2016 at 4:55 history answered Ian Agol CC BY-SA 3.0