Four-divergence of the four-current: $\partial_\mu J^\mu=c\,\frac{\partial\rho}{\partial(ct)}+\nabla\cdot\mathbf j$

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Four-divergence of the four-current: $\partial_\mu J^\mu=c\,\frac{\partial\rho}{\partial(ct)}+\nabla\cdot\mathbf j$ · Prove2Me