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Hyperbolic groups that are not commensurably coHopfian

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 نشر من قبل Emily Stark
 تاريخ النشر 2018
  مجال البحث
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Sela proved every torsion-free one-ended hyperbolic group is coHopfian. We prove that there exist torsion-free one-ended hyperbolic groups that are not commensurably coHopfian. In particular, we show that the fundamental group of every simple surface amalgam is not commensurably coHopfian.



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