A non-standard representation for Brownian Motion and Itô integration
A non-standard representation for Brownian Motion and Itô integration
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布朗运动和 Itô 积分的非标准表示
DOI:
10.1090/s0002-9904-1976-13976-6
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发表时间:
1976
影响因子:
1
通讯作者:
R. Anderson
中科院分区:
文献类型:
--
作者:
R. Anderson
In a recent paper [10], Peter A. Loeb showed how to convert non-standard measure spaces into standard ones and gave applications to probability theory. We apply these results to Brownian Motion and Itô integration. We first develop a number of new tools about Loeb spaces. We then show that Brownian Motion can be obtained as the Loeb process corresponding to a non-standard random walk obtained from a*-finite number of coin tosses. This permits a very constructive proof of a special case of Donsker's Theorem. The Itô integral with respect to this Brownian Motion is a non-standard Stieltjes integral with respect to the random walk. As a consequence, an easy proof of Itô’s Lemma is possible. The results in this paper were announced in [1].