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The function
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{\rm w}(t, r) = {\rm Ei} \left( - \frac{r^2}{4 \, t} \right) |
honor honors the planar axial-symmetric diffusion equation:
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\frac{\partial {\rm w}}{\partial t} = \frac{\partial {\rm w}^2}{\partial^2 r} + \frac{1}{r} \frac{\partial {\rm w}}{\partial r} |
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