Gromov hyperbolicity of the jG and jG metrics

Gromov hyperbolicity of the jG and jG metrics
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DOI:
10.1090/s0002-9939-05-08053-6
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发表时间:
2005-08
期刊:
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影响因子:
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通讯作者:
P. Hästö
P. Hästö
中科院分区:
其他
文献类型:
--
作者:
P. Hästö

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本文证明了j G度量总是Gromov双曲的,但j G度量是Gromov双曲的当且仅当G有一个边界点.作为推论,我们得到了拟双曲度量在一致区域上是Gromov双曲的一个新的证明。
In this note it is shown that the j G metric is always Gromov hyperbolic, but that the j G metric is Gromov hyperbolic if and only if G has exactly one boundary point. As a corollary we get a new proof for the fact that the quasihyperbolic metric is Gromov hyperbolic in uniform domains.