# Dictionary:Lorentz condition

${\displaystyle \nabla \cdot \mathbf {A} =-(\mu \epsilon {\frac {\partial {\phi }}{\partial {t}}}+\mu \sigma \phi )}$
on the electromagnetic vector potential ${\displaystyle \mathbf {A} }$ and scalar potential ${\displaystyle \phi }$ that forces each to satisfy the wave equation. Named for Hendrik Antoon Lorentz (1853–1928), Dutch physicist.