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It is known that the $\tilde j$-metric, half-apollonian metric and scale-invariant Cassinian metric are not Gromov hyperbolic. These metrics are defined as a supremum of one-point metrics (i.e., metrics constructed using one boundary point) and the s
Externí odkaz:
http://arxiv.org/abs/1709.04063
Publikováno v:
Proceedings of the American Mathematical Society, 2018 Dec 01. 146(12), 5205-5218.
Externí odkaz:
https://www.jstor.org/stable/90026455
