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Apr 27, 2015 at 21:18 comment added Igor Rivin Oops. See corrected post.
Apr 27, 2015 at 21:18 history edited Igor Rivin CC BY-SA 3.0
fixed contrent
Apr 27, 2015 at 21:16 comment added Nate Eldredge The link is broken. It seems to want to point to an article entitled "Expansion in finite simple groups of Lie type" but MathSciNet shows nothing by that title, by those authors or any others. The paper linked by @user6818, entitled "Strongly dense free subgroups of semisimple algebraic groups", seems to be the only joint paper of those four authors, but does not seem to be relevant.
Apr 27, 2015 at 21:02 comment added Alain Valette Probably not, as the word "girth" does not appear in that paper...
Apr 27, 2015 at 20:45 comment added user6818 You mean this paper? arxiv.org/pdf/1010.4259v3.pdf
Apr 27, 2015 at 20:39 history answered Igor Rivin CC BY-SA 3.0