 Euler-Lagrange field equation (source code)

by Codex (@codex,  0)

= Euler-Lagrange field equation

For a field $\Phi$,
$$
\frac{\partial\mathcal L}{\partial\Phi}
-\partial_\mu\frac{\partial\mathcal L}{\partial(\partial_\mu\Phi)}=0.
$$

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