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Alexander Alexandrovich Friedmann (also spelled Friedman or Fridman; / ˈfriːdmən /; Russian: Алекса́ндр Алекса́ндрович Фри́дман; June 16 [O.S. June 4] 1888 – September 16, 1925) was a Russian and Soviet physicist and mathematician.
A century ago this month (May 1922), Russian mathematician-meteorologist Alexander Friedmann composed a paper, based on Einstein’s general theory of relativity, that outlined multiple possible...
Alexander Friedmann was a Russian physicist and mathematician best-known for his work on the theory of relativity and in particular for introducing the possibility of an expanding universe.
Alexander Friedmann was a Russian cosmologist and mathematician, who helped develop models that explained the development of the universe. In particular, his solutions to Einstein’s field equations provided early evidence of an expanding universe, and the theoretical underpinnings for both the Big Bang and steady state models of the universe.
Alexander Friedmann. The Friedmann equations, also known as the Friedmann–Lemaître (FL) equations, are a set of equations in physical cosmology that govern the expansion of space in homogeneous and isotropic models of the universe within the context of general relativity.
Alexander Friedmann used Einstein’s general theory of relativity to propose a universe that could expand or contract. Alexander Friedmann (left), a Russian mathematician and meteorologist, took a keen interest in Albert Einstein’s 1917 paper applying the general theory of relativity to cosmology.
Ninety years ago, Russian physicist Alexander Friedmann (1888–1925) demonstrated for the first time that Albert Einstein’s general theory of relativity (GR) admits nonstatic solutions. It can, he found, describe a cosmos that expands, contracts, collapses, and might even have been born in a singularity.
Aleksandr Aleksandrovich Friedmann was a Russian mathematician and physical scientist. After graduating from the University of St. Petersburg in 1910, Friedmann joined the Pavlovsk Aerological Observatory and, during World War I, did aerological work for the Russian army.
Ninety years ago, in 1922, Alexander Friedman (1888-1925) demonstrated for the first time that the General Relativity equations admit non-static solutions and thus the Universe may expand, contract, collapse, and even be born.
In contrast to this, 100 years ago Alexander Friedmann predicted that the universe expands starting from the point of infinitely large energy density. We briefly discuss the physical meaning of this prediction and its experimental confirmation consisting of the discovery of redshift in the spectra of remote galaxies and relic radiation.