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arXiv 2011.10347math.PR
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关于半鞅性的缺乏

On the lack of semimartingale property

Vilmos Prokaj, László Bondici

摘要:

在这项工作中,我们将Cinlar等人(1980)中半鞅函数的特征推广到非马尔可夫环境。证明了若半鞅的函数保持半鞅,则在一定条件下,该函数必有区间,其中该区间是两个凸函数的差。在适当的条件下,这一性质也适用于随机函数。作为应用,我们证明了Prokaj et al.(2011)中定义的中值过程不是半鞅。同样的过程也出现在Hu和Warren(2000)中,其中半鞅性质的问题被提出但没有解决。

英文摘要:

In this work we extend the characterization of semimartingale functions in Cinlar et al. (1980) to the non-Markovian setting. We prove that if a function of a semimartingale remains a semimartingale, then under certain conditions the function must have intervals where it is a difference of two convex functions. Under suitable conditions this property also holds for random functions. As an application, we prove that the median process defined in Prokaj et al. (2011) is not a semimartingale. The same process appears also in Hu and Warren (2000) where the question of the semimartingale property is raised but not settled.

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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