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Showing 1 to 2 of 2 for “"hierarchically hyperbolic"”.
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Boundaries and hierarchically hyperbolic spaces
Although the hierarchically hyperbolic space boundary is a generalization of the Gromov boundary, we will show there are fundamental differences between the two. First, we provide negative answers to questions posed by Durham, Hagen, and Sisto on the existence of boundary maps for some …
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Uniform exponential growth of non-positively curved groups
… to show that certain subgroups of isometries of hyperbolic 3-space are free and remains one of very few tools that certify when a pair of group elements generate a free subgroup or semigroup. Quantitatively applying the ping-pong lemma to more general group actions on metric spaces requires a …