Abstract
We show that the solutions u∈K of
where
are of class Co,α (Ω) or Co,α (Ω), if the obstacles have this property. The same fact is true for systems of variational inequalities with constant coefficients, when there are no obstacles.
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Eisen, G. On the obstacle problem with a volume constraint. Manuscripta Math 43, 73–83 (1983). https://doi.org/10.1007/BF01169097
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DOI: https://doi.org/10.1007/BF01169097