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Can someone explain what kind of sorcellery is this proof about Maxwell's equations: http://proofs.wiki/Maxwell%27s_equations_predict_that_the_speed_of_light_is_constant. Is this a joke?

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    $\begingroup$ Why would it be a joke? And no, it's mathematics not sorcery. $\endgroup$ – Nephente Dec 28 '14 at 12:44
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    $\begingroup$ This is pretty standard fare for a first-semester EM class. It's been a while since I've done vector calculus, but still found the proof pretty straight forward. What steps troubled you? $\endgroup$ – Sean Dec 28 '14 at 13:17
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    $\begingroup$ I think the interesting point is that $v$ is the same in every inertial reference frame. $\endgroup$ – lionelbrits Dec 28 '14 at 13:56
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The mentioned proof is combining Maxwell's equations in the vacuum together in order to get to a wave equation. The parameter $v$ can be interpreted as a propagation speed, so this shows that the speed of propagation of electromagnetic waves in the vacuum is a "constant".

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