Abstract
For functions which are harmonic in a sphere, Višik [9] has proved an estimate of the normal derivative in terms of the tangential ones.
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References
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Hörmander, L. (2018). Inequalities Between Normal And Tangential Derivatives Of Harmonic Functions. In: Unpublished Manuscripts . Springer, Cham. https://doi.org/10.1007/978-3-319-69850-2_6
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DOI: https://doi.org/10.1007/978-3-319-69850-2_6
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