- How Einstein's SR becomes GR?
$$ds^2=dr^2-c^2dt^2,$$
$$ds^2=g_{\mu\nu}dx^{\mu}dx^{\nu}.$$
When the $s$ is constant $ds^2=0$, isn't it true?
How to connect Einstein's SR with GR?
What is the GR-differential $ds^2$?
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