Confused by D'alembertian operator in EM

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The discussion centers on confusion regarding the application of the D'Alembertian operator to the 4-vector potential in electromagnetic theory. Participants express difficulty in understanding the equation involving the D'Alembertian, the 4-vector potential A, and the 4-vector current J. Suggestions are made to utilize external resources for clarification, including a link to a relevant physics forum. The conversation highlights the complexity of the mathematical formulation in electromagnetic theory. Overall, the participants seek a clearer understanding of the relationship between these concepts.
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I can't understand how the D'Alembertian x 4-vector Vector potential = mu x 4-vector J



Have

\nambla^2\A-1\c^2\ frac{ \partial^{2}A}{\partial {t}^{2} } } = \-mu\J
 
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forget it i can't do the font
 

Thread 'EPR revisited'

In an inertial frame of reference (IFR), there are two fixed points, A and B, which share an entangled state $$ \frac{1}{\sqrt{2}}(|0>_A|1>_B+|1>_A|0>_B) $$ At point A, a measurement is made. The state then collapses to $$ |a>_A|b>_B, \{a,b\}=\{0,1\} $$ We assume that A has the state ##|a>_A## and B has ##|b>_B## simultaneously, i.e., when their synchronized clocks both read time T However, in other inertial frames, due to the relativity of simultaneity, the moment when B has ##|b>_B##...
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