Source: cirosantilli/lorentz-gauge-condition
= Lorentz gauge condition
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= Lorentz gauge
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There are several choices of <electromagnetic four-potential> that lead to the same physics.
E.g. thinking about the <electric potential> alone, you could set the zero anywhere, and everything would remain be the same.
The Lorentz gauge is just one such choice. It is however a very popular one, because it is also manifestly <Lorentz invariant>.