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Friedmann model

[freed-muh n] /ˈfrid mən/
noun, Astronomy
1.
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.
Origin
named after Alexander Friedmann, (1885-1925), Russian mathematician, who made the necessary calculations in 1922
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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