= Gauge symmetry
{wiki=Gauge_symmetry_(mathematics)}
\Video[https://www.youtube.com/watch?v=YP-tPE7WO64]
{title=Lawrence Krauss explains Gauge symmetry by Joe Rogan (2017)}
{description=
While most of this is useless as you would expect from the channel, it does give one key idea: you can change charge locally, but things somehow still work out.
And this has something to do with the general intuition of <special relativity> that only local measures make much sense, as evidenced by <Einstein synchronization>.
}
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