
arXiv: 1210.1848
To provide a solid analytic foundation for the module approach to conditional risk measures, this paper establishes a complete random convex analysis over random locally convex modules by simultaneously considering the two kinds of topologies (namely the $(\varepsilon,��)$--topology and the locally $L^0$-- convex topology). Then, we make use of the advantage of the $(\varepsilon,��)$--topology and grasp the local property of $L^0$--convex conditional risk measures to prove that every $L^{0}$--convex $L^{p}$--conditional risk measure ($1\leq p\leq+\infty$) can be uniquely extended to an $L^{0}$--convex $L^{p}_{\mathcal{F}}(\mathcal{E})$--conditional risk measure and that the dual representation theorem of the former can also be regarded as a special case of that of the latter, which shows that the study of $L^p$--conditional risk measures can be incorporated into that of $L^{p}_{\mathcal{F}}(\mathcal{E})$--conditional risk measures. In particular, in the process we find that combining the countable concatenation hull of a set and the local property of conditional risk measures is a very useful analytic skill that may considerably simplify and improve the study of $L^{0}$--convex conditional risk measures.
69 pages
Mathematics - Functional Analysis, FOS: Economics and business, Risk Management (q-fin.RM), 46A22, 46A25, 46H25, 47H40, 52A41, 91B16, 91B30, 91B70, FOS: Mathematics, Quantitative Finance - Risk Management, Functional Analysis (math.FA)
Mathematics - Functional Analysis, FOS: Economics and business, Risk Management (q-fin.RM), 46A22, 46A25, 46H25, 47H40, 52A41, 91B16, 91B30, 91B70, FOS: Mathematics, Quantitative Finance - Risk Management, Functional Analysis (math.FA)
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