It is a generalization of the Lorentz gauge, and obtained by putting
2.
Amplitudes of physical processes in QED in the noncovariant Coulomb gauge coincide with those in the covariant Lorentz gauge.
3.
Note, however, that this gauge was originally named after the Danish physicist Ludvig Lorenz and not after Hendrik Lorentz; it is often misspelled " Lorentz gauge " . ( Neither was the first to use it in calculations; it was introduced in 1888 by George F . FitzGerald .)
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