Derives Euler-Lagrange equations for fields from the action principle, proves coordinate independence, and recovers Maxwell's equations from the EM Lagrangian.
Equation defFByArg then reads (x) = bar 016 ( bar 016 x ) + .2777em + .2777em (f( bar 016 x )) = bar 016 ( bar 016 x )
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Demystifying the Lagrangian formalism for field theories
Derives Euler-Lagrange equations for fields from the action principle, proves coordinate independence, and recovers Maxwell's equations from the EM Lagrangian.