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Let $0<\alpha, $1 and $\frac{1}{q}=\frac{1}{p}-\frac{\alpha}{n}$. Then:

$\left\|\int_{\mathbb{R}^n} \frac{f(y)dy}{|x-y|^{n-\alpha}} \right\|_{L^q(\mathbb{R}^n)} \leq C\left\| f \right\|_{L^p(\mathbb{R}^n)}$.

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    Would you mind and formulate a question?2012-10-19

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