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arXiv 1901.04039math.PR
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跳过程曲面上变量随局部时的变量变换

Change of Variables with Local Time on Surfaces for Jump Processes

Daniel Wilson

摘要:

Peskir的“曲线上的局部时间”公式为一个函数提供了一个变量的随机变量变换公式,该函数的导数在一条随时间变化的曲线上可能是不连续的,这种设置经常出现在最优控制及其他方面的应用中。这个公式被进一步扩展到更高的维度,并包括在实际中可能难以验证的条件下的跳跃过程。我们建立在杜托伊特的工作,在削弱所需的条件,允许半鞅跳跃。此外,在截面一阶导数为零的条件下(所谓的“光滑拟合”条件),我们证明了经典的伊藤公式在一般条件下仍然成立.

英文摘要:

The `local time on curves' formula of Peskir provides a stochastic change of variables formula for a function whose derivatives may be discontinuous over a time-dependent curve, a setting which occurs often in applications in optimal control and beyond. This formula was further extended to higher dimensions and to include processes with jumps under conditions which may be hard to verify in practice. We build upon the work of Du Toit in weakening the required conditions by allowing semimartingales with jumps. In addition, under vanishing of the sectional first derivative (the so-called `smooth fit' condition), we show that the classical Itô formula still holds under general conditions.

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