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arXiv math/0604021math.PR
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退化情形下减步长Euler格式的性质

Behavior of the Euler scheme with decreasing step in a degenerate situation

Vincent Lemaire

摘要:

本文研究具有多个不变测度的一维扩散过程的减步Euler格式的加权经验测度的性质。当漂移和扩散系数同时为零时,可能会出现这种情况。作为第一步,我们给一个简单的描述的费勒的分类的一维过程。我们回顾了吸引和排斥边界点的概念,并引入了强排斥点的概念。这使我们能够建立一个分类的遍历行为的扩散。最后,我们用李雅普诺夫函数给出了边界点的性质的充要条件。在第二节中,我们利用这个特征来研究减步Euler格式。最后给出了一个高维情形下的数值例子.

英文摘要:

The aim of this paper is to study the behavior of the weighted empirical measures of the decreasing step Euler scheme of a one-dimensional diffusion process having multiple invariant measures. This situation can occur when the drift and the diffusion coefficient are vanish simultaneously. As a first step, we give a brief description of the Feller's classification of the one-dimensional process. We recall the concept of attractive and repulsive boundary point and introduce the concept of strongly repulsive point. That allows us to establish a classification of the ergodic behavior of the diffusion. We conclude this section by giving necessary and sufficient conditions on the nature of boundary points in terms of Lyapunov functions. In the second section we use this characterization to study the decreasing step Euler scheme. We give also an numerical example in higher dimension.

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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