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Kantorovich-Rubinstein quasi-metrics I: Spaces of measures and of continuous valuations
Topology and its Applications ( IF 0.6 ) Pub Date : 2021-03-30 , DOI: 10.1016/j.topol.2021.107673
Jean Goubault-Larrecq

We show that the space of subprobability measures, equivalently of subprobability continuous valuations, on an algebraic (resp., continuous) complete quasi-metric space is again algebraic (resp., continuous) and complete, when equipped with the Kantorovich-Rubinstein quasi-metrics dKR (unbounded) or dKRa (bounded), themselves asymmetric forms of the well-known Kantorovich-Rubinstein metric. We also show that the dKR-Scott and the dKRa-Scott topologies then coincide with the weak topology. We obtain similar results for spaces of probability measures, equivalently of probability continuous valuations, with the dKRa quasi-metrics, or with the dKR quasi-metric under an additional rootedness assumption.



中文翻译:

坎托罗维奇-鲁宾斯坦准度量I:度量空间和连续估值

我们证明,当配备了Kantorovich-Rubinstein准方程时,在代数(分别为连续的)完全拟度量空间上,子概率测度的空间(等同于子概率连续计价)又是代数的(分别为连续的)且是完备的。指标 dKR (无界)或 dKR一个(有界),它们本身是众所周知的Kantorovich-Rubinstein度量的不对称形式。我们还表明dKR-斯科特和 dKR一个然后,Scott拓扑与弱拓扑重合。对于概率测度空间,我们获得了相似的结果,等效于概率连续估值,其中dKR一个 准度量,或与 dKR 附加生根假设下的准度量。

更新日期:2021-04-01
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