$$\boldsymbol{C^{k}}$$-Properties of Subharmonic Functions

This paper presents the results on differential properties of the subharmonic functions. It is proved that the Riesz potential $${U_{n-\alpha}^{\mu}(x)}$$ $${(1\leq\alpha<n)}$$ belongs to the Zygmund class under certain sufficient conditions imposed on the measure $$\mu$$ .

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