Hi, can someone confirm those or did I not get the meaning of the 4-vectors indices:(adsbygoogle = window.adsbygoogle || []).push({});

[itex]\partial^{\mu}x_{\mu}=4;\partial^{\mu}x^{\mu}=2;\partial^{\mu}x_{\nu}= \delta ^{\mu}_{\nu};\partial^{\mu}x^{\nu}=g^{\mu\nu}[/itex]

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# Contractions of indices of the 4-vectors

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