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Albert Einstein
Sidelights on Relativity
Publisher: Methuen & Co.
Publication Date: 1922
Edition: First Edition
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Two influential essays: "Ether and Relativity" (1920) discusses properties demanded of the ether of space by the theory of relativity; "Geometry and Experience" (1921) describes the limits within which the Euclidean or other practical geometric systems can be regarded as valid in connection with the concept of a finite universe.
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