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arXiv 1805.09469math.PR
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多维鞅最优输运的局部结构

Local structure of multi-dimensional martingale optimal transport

Hadrien De March

摘要:

本文分析了高维最优鞅运输计划的条件分布的支持性。在大于2维的距离耦合的背景下,Ghoussoub,Kim和Lim建立的先前结果表明,这种条件传输集中在自己的Choquet边界上。当目标测度是原子测度时,证明了支持度集中在d+1点上,并推测这一结果对任意目标测度都成立。我们给出了一般Lipschitz耦合的条件最优输运的结构结果。利用代数几何的工具,我们提供了充分条件,这个条件支持的有限性,连同(最佳)下界的最大基数为一个给定的耦合函数。对于基于距离函数的耦合函数的具体例子,得到了更多的结果。特别是,我们表明,Ghoussoub,Kim & Lim的上述猜想是不成立的,超出了原子靶分布的背景。

英文摘要:

This paper analyzes the support of the conditional distribution of optimal martingale transport plans in higher dimension. In the context of a distance coupling in dimension larger than 2, previous results established by Ghoussoub, Kim & Lim show that this conditional transport is concentrated on its own Choquet boundary. Moreover, when the target measure is atomic, they prove that the support is concentrated on d+1 points, and conjecture that this result is valid for arbitrary target measure. We provide a structure result of the support of the conditional optimal transport for general Lipschitz couplings. Using tools from algebraic geometry, we provide sufficient conditions for finiteness of this conditional support, together with (optimal) lower bounds on the maximal cardinality for a given coupling function. More results are obtained for specific examples of coupling functions based on distance functions. In particular, we show that the above conjecture of Ghoussoub, Kim & Lim is not valid beyond the context of atomic target distributions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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