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- ...me is a 4D differentiable [[manifold|Riemannian manifold]] whose curvature tensor satisfies Einstein’s field equations <cmath>R_{\mu\nu} - \frac{1}{2}Rg_{\ ...reason. On the right-hand side, <math>T_{\mu\nu}</math> is the mass-energy tensor, which describes the distribution of [[mass-energy]] throughout the [[unive1 KB (187 words) - 01:49, 20 November 2020