[tex]\Delta\psi(\vec{r},t)-\frac{1}{\upsilon^2}\frac{\partial^2\psi(\vec{r},t)}{\partial t^2}=-g(\vec{r},t)[/tex](adsbygoogle = window.adsbygoogle || []).push({});

How to get solution

[tex]\psi(\vec{r},t)=\frac{1}{r}F_1(t-\frac{r}{\upsilon})[/tex]

where [tex]F_1[/tex] is any function of argument [tex]t-\frac{r}{\upsilon}[/tex].

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# Dalamber equation

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