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Friedmann model

[freed-muh n] /ˈfrid mən/
noun, Astronomy
any model of the universe deduced from a homogeneous, isotropic solution of Einstein's field equations without a cosmological constant. Such models form the mathematical basis for many modern cosmologies and provide for expansion or contraction of the universe.
Also called Friedmann universe.
named after Alexander Friedmann, (1885-1925), Russian mathematician, who made the necessary calculations in 1922 Unabridged
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