Abstract
In this paper we prove a variational inequality which gives a necessary condition for a minimum of a certain in general non-differentiable function. This inequality is applied to problems of best approximation and optimization to deduce global conditions for a minimum.
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Brosowski, B., Hoffmann, K.H. Eine Variationsungleichung und Anwendungen. Numer. Math. 22, 137–147 (1974). https://doi.org/10.1007/BF01436728
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DOI: https://doi.org/10.1007/BF01436728