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Derivative wrt retarded time
I am confused by the following statement in footnote of Griffiths 4th edition (page 446):
$$\frac{\partial }{\partial t_r} = \frac{\partial }{\partial t},$$ where $$t_r=t - \frac{\mathscr{r}}{c}$$ ...
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Equating $\partial_{t_r}$ = $\partial_{t}$ in the retarded potentials?
Im reading Griffiths E/M (4th edition) and came across something I don't understand: Page 446, footnote 8 which reads:
"Note that $\frac{\partial }{\partial t_r} = \frac{\partial }{\partial t}$ since ...
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