Lorenz gauge
Lorenz gauge is the specific condition on the scalar and vector potentials: \[\begin{equation} \require{physics} \frac{1}{c^2} \pdv{\phi(\vb{r}, t)}{t} + \boldsymbol{\nabla} \vdot{\vb{A}(\vb{r}, t)} = 0 \thinspace . \end{equation}\]
Lorenz gauge is the specific condition on the scalar and vector potentials: \[\begin{equation} \require{physics} \frac{1}{c^2} \pdv{\phi(\vb{r}, t)}{t} + \boldsymbol{\nabla} \vdot{\vb{A}(\vb{r}, t)} = 0 \thinspace . \end{equation}\]