Abstract
For each \(k>0\) we find an explicit function \(f_k\) such that the topology of \(S\) inside the ball \(B_S(p,r)\) is ‘bounded’ by \(f_k(r)\) for every complete Riemannian surface (compact or non-compact) \(S\) with \(K \ge -k^2\), every \(p \in S\) and every \(r>0\). Using this result, we obtain a characterization (simple to check in practical cases) of the Gromov hyperbolicity of a Riemann surface \(S^*\) (with its own Poincaré metric) obtained by deleting from one original surface \(S\) any uniformly separated union of continua and isolated points.
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Acknowledgments
J. Gonzalo Partially supported by grants MTM2007-61982 from MEC Spain and MTM2008-02686 from MICINN Spain. A. Portilla and E. Tourís supported in part by a grant MTM 2009-12740-C03-01 from MICINN Spain. A. Portilla, J. M. Rodrígurz and E. Tourís are supported in part by two grants MTM 2009-07800 and MTM 2008-02829-E from MICINN Spain. J. M. Rodríguez supported in part by a grant from CONACYT (CONACYT-UAG I0110/62/10), México.
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Gonzalo, J., Portilla, A., Rodríguez, J.M. et al. The topology of balls in Riemannian surfaces and Gromov hyperbolicity. Math. Z. 275, 741–760 (2013). https://doi.org/10.1007/s00209-013-1158-5
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DOI: https://doi.org/10.1007/s00209-013-1158-5