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arXiv 0908.1843math.FAmath.PR
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随机局部凸模的基本结果与两类拓扑性质的综合联系

A comprehensive connection between the basic results and properties derived from two kinds of topologies for a random locally convex module

Tiexin Guo

摘要:

本文的目的是将作者引入的$(ε,λ)-$拓扑和Filipovi $\acute{c}$等人最近引入的强局部$L^{0}-$凸拓扑的基本结果和性质联系起来. al)对于随机局部凸模.首先,我们给出了已知的$L^{0}-$线性函数的Hahn-Banach扩张定理及其连续变式的一个极其简单的证明。然后给出了[Filipovi $\acute{c}$ et.等人,J. Funct. Anal.256(2009)3996- 4029]和[Guo et.等,非线性分析。71(2009)3794--3804]:在这个过程中得到了一个有用的和令人惊讶的事实,即具有可数级联性质的随机局部凸模在两个拓扑下必须具有相同的完备性!基于这两种完备性之间的关系,我们进一步给出了本文的中心部分:证明了在局部$L^{0}-$凸拓扑下,以前建立的关于随机赋范模的随机共轭空间的大部分深层次结果仍然有效,这大大丰富了随机赋范模的金融应用.

英文摘要:

The purpose of this paper is to make a comprehensive connection between the basic results and properties derived from the two kinds of topologies (namely the $(ε,λ)-$topology introduced by the author and the stronger locally $L^{0}-$convex topology recently introduced by Filipovi$\acute{c}$ et. al) for a random locally convex module. First, we give an extremely simple proof of the known Hahn-Banach extension theorem of $L^{0}-$linear functions as well as its continuous variants. Then we give the essential relations between the hyperplane separation theorems in [Filipovi$\acute{c}$ et. al, J. Funct. Anal.256(2009)3996--4029] and a basic strict separation theorem in [Guo et. al, Nonlinear Anal. 71(2009)3794--3804]: in the process obtain a useful and surprising fact that a random locally convex module with the countable concatenation property must have the same completeness under the two topologies! Based on the relation between the two kinds of completeness, we go on to present the central part of this paper: we prove that most of the previously established deep results of random conjugate spaces of random normed modules under the $(ε,λ)-$topology are still valid under the locally $L^{0}-$convex topology, which considerably enriches financial applications of random normed modules.

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