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Some other sources for the tensor formulas are:
- Sean Carroll GR Cosmology notes: [ Ссылка ]
- Section 2.9 of the Catalogue of Spacetimes (note they they take the g_tt metric term to be c^2 instead of 1, so the locations of c in the formulas are different: [ Ссылка ]

0:00 Intro + Notation
2:48 Connection Coefficients
10:08 Ricci Tensor
19:04 Ricci Scalar

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