Abstract
It is shown that weak solutions of mixed elliptic problems are Hölder continuous of any order less than 1/2 and that they possess higher regularity in non-critical directions.
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Shamir, E. Regularization of mixed second-order elliptic problems. Israel J. Math. 6, 150–168 (1968). https://doi.org/10.1007/BF02760180
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DOI: https://doi.org/10.1007/BF02760180