Is the Lagrangian of the neutral Proca field(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\mathcal{L}=-\frac{1}{16\pi}\left(F^{\mu\nu}F_{\mu\nu}-2m^2 A_{\mu} A^{\mu}\right)[/tex]

symmetric?

And How to make sure whether it's symmetric.

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# Make sure the Lagrangian symmetry？

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