Fixed point theorems for metric spaces with a conical geodesic bicombing

Fixed point theorems for metric spaces with a conical geodesic bicombing
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具有圆锥测地线双梳的度量空间的不动点定理

DOI:
10.1017/etds.2016.106
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发表时间:
2015
影响因子:
0.9
通讯作者:
Giuliano Basso
Giuliano Basso
中科院分区:
数学2区
文献类型:
--
作者:
Giuliano Basso

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我们针对一类包含所有 Banach 空间和所有完备 Busemann 空间的度量空间导出两个不动点定理。我们通过使用 $1$ -Lipschitz 重心构造和不变氡概率测量的存在结果来获得结果。此外,我们构造了一个有界完备的 Busemann 空间,它允许没有固定点的等距。
We derive two fixed point theorems for a class of metric spaces that includes all Banach spaces and all complete Busemann spaces. We obtain our results by the use of a $1$ -Lipschitz barycenter construction and an existence result for invariant Radon probability measures. Furthermore, we construct a bounded complete Busemann space that admits an isometry without fixed points.