Confused by D'alembertian operator in EM

Main Question or Discussion Point

I can't understand how the D'Alembertian x 4-vector Vector potential = mu x 4-vector J

Have

$$\nambla^2\A-1\c^2\ frac{ \partial^{2}A}{\partial {t}^{2} } } = \-mu\J$$

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forget it i can't do the font

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