"The models of Einstein and de Sitter are static solutions of Einstein's modified gravitational equations for a world-wide homogeneous system. They both involve a positive cosmological constant λ, determining the curvature of space. If this constant is zero, we obtain a third model in classical infinite Euclidean space. This model is empty, the space-time being that of Special Relativity. It has been shown that these are the only possible static world models based on Einstein's theory. In 1922, Friedmann... broke new ground by investigating non-static solutions to Einstein's field equations, in which the radius of curvature of space varies with time. This possibility had already been envisaged, in a general sense, by Clifford in the eighties."
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Atheists from EnglandUniversity of Cambridge alumniPhilosophers from EnglandUniversity of Cambridge facultyMathematicians from England
Original Language: English
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Gerald James Whitrow, The Structure of the Universe: An Introduction to Cosmology (1949)
https://en.wikiquote.org/wiki/William_Kingdon_Clifford
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William Kingdon Clifford
William Kingdon Clifford (May 4, 1845 – March 3, 1879) was an English mathematician and philosopher.
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