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arXiv 1106.2630math.PR
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关于有限全变差过程对càdlàg轨线过程的路径一致逼近

On pathwise uniform approximation of processes with càdlàg trajectories by processes with finite total variation

Rafał M. Łochowski

摘要:

对于任何具有càdlàg路径的实值随机过程X,我们定义非空过程族,其具有有限的全变差,具有与过程X相同阶的跳跃,并且一致地逼近其路径:这允许将任何具有càdlàg路径和无限全变差的实值随机过程分解为一致闭合的有限变差过程和适应过程的和,具有任意小振幅但无限的全变差。定义类的另一个应用是关于过程X的随机积分的定义,作为路径Lebesgue-Stieltjes积分的极限。这种结构导致了一些修正项的随机积分。

英文摘要:

For any real-valued stochastic process X with càdlàg paths we define non-empty family of processes, which have finite total variation, have jumps of the same order as the process X and uniformly approximate its paths: This allows to decompose any real-valued stochastic process with càdlàg paths and infinite total variation into a sum of uniformly close, finite variation process and an adapted process, with arbitrary small amplitude but infinite total variation. Another application of the defined class is the definition of the stochastic integral with respect to the process X as a limit of pathwise Lebesgue-Stieltjes integrals. This construction leads to the stochastic integral with some correction term.

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