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High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! The Friedmann equations are a set of equations in cosmology that govern the expansion of space in homogeneous and isotropic models of the universe within the context of general relativity. They were first derived by Alexander Friedmann in 1922 from Einstein's field equations of gravitation for the Friedmann-Lemaître-Robertson-Walker metric and a fluid with a given mass density !rho and pressure !p. The equations for negative spatial curvature were given by Friedmann in 1924.