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The real-value positive function
of the two real-value positive arguments (time LaTeX Math Inline body {\rm w}(t,r)
and radial coordinate LaTeX Math Inline body t
and ):LaTeX Math Inline body r
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{\rm w}(t, r) = E_1 \left( \frac{r^2}{4 \, t} \right) = -{\rm Ei} \left( - \frac{r^2}{4 \, t} \right) |
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