Susskind emphasizes that if this tensor is zero, the space is flat (regardless of how strange the coordinates look). If it is non-zero, space is curved. The theoretical minimum culminates in the "action" principle. Just as Newton gave us $F=ma$, Einstein gave us the relationship between geometry and matter. Runa Ayase -sky-265- -- Jav.uncensored.2013 Guide
The text derives the field equations by varying the : $$I = \int \sqrt{-g} , R , d^4x$$ Where $R$ is the Ricci Scalar (a contraction of the Riemann tensor). Scarlett Johansson Sex Tape - Celebrity Xxx Video Scandal.torrent - 3.79.94.248
$$R^\rho_{\sigma\mu\nu} = \partial_\mu \Gamma^\rho_{\nu\sigma} - \partial_\nu \Gamma^\rho_{\mu\sigma} + \Gamma^\rho_{\mu\lambda}\Gamma^\lambda_{\nu\sigma} - \Gamma^\rho_{\nu\lambda}\Gamma^\lambda_{\mu\sigma}$$
A Structured Derivation of Spacetime Curvature Leonard Susskind’s approach to General Relativity (GR) in The Theoretical Minimum is distinct from traditional textbooks. Rather than starting with the obscure history of the equivalence principle or the bending of light, Susskind and Cabannes focus immediately on the mathematical machinery required to describe gravity: Riemannian Geometry and Tensor Calculus .
Here is the developmental arc of the subject as presented in the text. The book begins where Special Relativity left off. In Special Relativity, spacetime is flat, described by the Minkowski metric ($\eta_{\mu\nu}$). The interval $ds^2$ is fixed: $$ds^2 = -c^2dt^2 + dx^2 + dy^2 + dz^2$$