Geometrie und ErfahrungIn 1905, a German technical journal, Annalen der Physik, published a remarkable paper by a young clerk in the patent office at Berne, Switzerland. The clerk was Albert Einstein. The paper outlined his Special Theory of Relativity, a revolutionary physical theory which discarded the concept of absolute motion in favor of relative motion in the context of a fourdimensional continuum of spacetime. It proved to be the most profound revolution in physics since Newton. About ten years later, building on his earlier work, Einstein formulated the General Theory of Relativity in which he offered a new solution to the great problem of gravitation, postulating the nonEuclidean character of the spacetime continuum. Together, the two theories constituted a radically reoriented way of looking at the physical universe, an approach that solved many of the unresolved difficulties of classical mechanics and paved the way for great advances in 20thcentury physics. This concise volume contains two addresses by Dr. Einstein outlining aspects of the theories. Ether and Relativity (1920), delivered at the University of Leyden, discusses the properties demanded of the ether of space by the theory of relativity. Geometry and Experience (1921), given at the Prussian Academy of Sciences, describes the limits within which the Euclidean or any other practical geometric system can be held to be approximately true in connection with the concept of a finite universe. Both lectures are reprinted here complete and unabridged; both express elegant ideas in simple prose devoid of complicated equations or abstruse terminology; both offer scientists and laypeople unparalleled insight into the seminal thinking of the 20th century's greatest physicist. 
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Review: Sidelights on Relativity
User Review  Josh  GoodreadsEinstein lays out in a logical and intuitive way some of the more difficult concepts to grasp in general relativity. Loved it. Read full review
Review: Sidelights on Relativity
User Review  Jason Kirk  GoodreadsComprised of two lectures delivered at the University of Leyden (1920) and the Prussian Academy of Sciences (1921), Sidelights on Relativity is probably best served to gluttons. (I count myself among ... Read full review
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