Details
EINSTEIN, Albert & Marcel GROSSMANN. Entwurf einer verallgemeinerten Relativitätstheorie und einer Theorie der Gravitation. I. Physikalischer Teil von Albert Einstein ... II Mathematischer Teil von Marcel Grossmann. Leipzig and Berlin: Teubner, 1913.
8o. Original printed wrappers (short tear to upper cover, very minor marginal splitting).
FIRST SEPARATE PRINTING, offprint from Zeitschrift für 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 693; Weil 59a.
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FIRST SEPARATE PRINTING, offprint from Zeitschrift für 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 693; Weil 59a.