∇2U :=Uxx +Uyy +Uzz =0, −∞<x, y<∞, z>0,
U(x,y,0) = f(x,y), −∞ < x, y < ∞,
U(x,y,z)→0 as r= x^2+y^2+z^2→∞. solve this using fourier transform
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