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On mappings of bounded variation

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Abstract

We present the properties of mappings of bounded variation defined on a subset of the real line with values in metric and normed spaces and show that major aspects of the theory of realvalued functions of bounded variation remains valid in this case. In particular, we prove the structure theorem and obtain the continuity properties of these mappings as well as jump formulas for the variation. We establish the existence of Lipschitz continuous geodesic paths and prove an analog of the well-known Helly selection principle. For normed space-valued smooth mappings we obtain the usual integral formula for the variation without the completeness assumption on the space of values. As an application of our theory we show that compact set-valued mappings (=multifunctions) of bounded variation admit regular selections of bounded variation.

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Partially supported by the Russian Foundation for Fundamental Research, Grant No. 96-01-00278.

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Chistyakov, V.V. On mappings of bounded variation. Journal of Dynamical and Control Systems 3, 261–289 (1997). https://doi.org/10.1007/BF02465896

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