Alexander Friedmann was a Russian physicist and mathematician known for his pioneering work in cosmology during the early 20th century. He is best known for the Friedmann equations, which are central to modern cosmology and describe how the universe expands over time. Friedmann's equations emerged from his analysis of Einstein's general theory of relativity and addressed the dynamics of a homogeneous and isotropic universe. His work laid the groundwork for the Big Bang theory of the universe's origin.
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