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deleted 18 characters in body

edited Jul 7, 2015 at 23:41

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For a concrete example, the dipole potential $$ \dfrac{x_1}{(x_1^2 + x_2^2 + x_3^2)^{3/2}}$$ is harmonic and $L^2$ on $a < x_1 < b$ if $0 < a < b$.

answered Jul 7, 2015 at 23:30

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