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d*dA=J
\partial_{\nu}\partial^{\nu}A^{\mu}-\partial^{\mu}(\partial_{\nu}A^{\nu})=-\mu_0j^{\mu}
Z[J]=\int{{\cal D} \phi}\exp \left[ i\int d^4x({\cal L}+J\phi)\right]
S=k_B\log W
G^{\mu \nu}=\frac{8\pi G}{c^4}T^{\mu \nu}