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Complexica (talk | contribs) →The Coulomb force: superscripts |
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:<math>
= {1\over 2}\int d^4x \; A_{\nu} \left( \partial^{2} A^{\nu} - \partial^{\nu} \partial_{\mu} A^{\mu} \right)
= {1\over 2}\int d^4x \; A_{\nu} \left( \delta^{\mu \nu} \partial^{2} \right) A_{\nu}
,</math>
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