London, South Kensington
8 October 1999
EINSTEIN, Albert & Marcel GROSSMANN. Entwurf einer verallgemeinerten Relativittstheorie und einer Theorie der Gravitation. I. Physikalischer Teil von Albert Einstein ... II Mathematischer Teil von Marcel Grossmann, Leipzig and Berlin: B. G. Teubner, 1913. 8 (last three leaves holed without loss of text, very lightly browned), recent cloth-backed wrappers, original printed wrappers bound in (rear wrappers holed with loss of wrapper).
FIRST SEPARATE PRINTING, offprint from Zeitschrift fr Mathematik und Physik, volume 62. "One of the turning-points in the development of relativity theory. Einstein had realized that he could proceed no further without expert mathematical help, and called upon his friend Michael Grossmann to supply it. Using the tensor calculus, the two were able to write a mathematical representation of gravitation representing a tenfold expansion from Newton's single gravitational potential - yet Einstein, with the problems of physical interpretation still unresolved, backed away from the necessity of considering ten corresponding field equations" (Norman).
Loosely inserted in the work is a photocopied letter by Sir Karl Popper addressed to J. M. Fried, Buckinghamshire, in which he describes this work as "one of einstein's most important papers ... There is no doubt in my mind that the Entwurf ... will always be regarded by historians of relativity as one of the turning points in development of Einstein, and, indeed of twenty century physical science". Norman 693; Weil 59a.
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