Extension of Lyapunov's Convexity Theorem to Subranges

Details Extension of Lyapunov's Convexity Theorem to Subranges Extension of Lyapunov's Convexity Theorem to Subranges

2011-02-12

arxiv.org/abs/1102.2534v1

Mathematics

Probability

7 pages, 1 figure

Scientific paper

Consider a measurable space with a finite vector measure. This measure defines a mapping of the $\sigma$-field into a Euclidean space. According to Lyapunov's convexity theorem, the range of this mapping is compact and, if the measure is atomless, this range is convex. Similar ranges are also defined for measurable subsets of the space. We show that the union of the ranges of all subsets having the same given vector measure is also compact and, if the measure is atomless, it is convex. We further provide a geometrically constructed convex compactum in the Euclidean space that contains this union. The equality of these two sets, that holds for two-dimensional measures, can be violated in higher dimensions.

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