Lorenz gauge condition
In electromagnetism, the Lorenz gauge condition or Lorenz gauge (after Ludvig Lorenz) is a partial gauge fixing of the electromagnetic vector potential by requiring ∂ μ A μ = 0 {\displaystyle \partial _{\mu }A^{\mu }=0} . The name is frequently confused with Hendrik Lorentz, who has given his name to many concepts in this field.