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\end{array}\right. is given by \tilde{U}_{0}(k)=\frac{2 \sin (\pi k)}{k\left(1-k^{2}\right)} The function u(z, y) satisfies the partial differential equation \frac{\partial^{2} u}{\partial x^{2}}+\frac{\partial^{2} u}{\partial y^{2}}=0 \quad \text { in } \quad-\infty

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