Abstract
We derive differential relations between spherical and solid means of continuous functions. Next we use the relations to give inductive proofs of the mean value property for polyharmonic functions and its converse in arbitrary dimension.
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Łysik, G. On the mean value property for polyharmonic functions. Acta Math Hung 133, 133–139 (2011). https://doi.org/10.1007/s10474-011-0138-7
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DOI: https://doi.org/10.1007/s10474-011-0138-7