EINSTEIN, Albert (1879-1955) Typed letter signed ('A. Einstein') to Mrs Allen I. Dunn, Institute for Advanced Study, Princeton, 23 May 1939. In English, half page, 255 x 204mm. Einstein explains his Unified Field Theory in plain English. Writing to a Mrs Dunn, Einstein indicates that he is sending under separate cover 'my paper concerning the unified field theory' for her husband. He goes on to explain the basic idea of his Unified Field Theory and his success with it: 'It is a general scheme that gives hope to understand the structure of the elementary particles. It is not yet known to me whether it will really give the correct solution of the problem, not having been able till now to integrate these equations satisfactorily'. Letters by Einstein in English with such good scientific content are rare on the market. [With:] A. Einstein and P. Bergmann, 'On a generalization of Kaluza's theory of electricity', offprint from Annals of Mathematics, vol.39, no.3, July 1938. Octavo (255 x 175mm). Pp. 683-701 (central vertical creasefold, some faint creasing throughout). Stapled printed self-wrappers (very short split to spine at head,vertical creasefold to wrappers). In 1921, Kaluza proposed a unified field theory by supposing the dimensionality of space-time be enlarged and formal geometry preserved. In 1931, Einstein reformulated Kaluza’s theory by constructing a five-dimensional vector space at each point of four-dimensional space-time, projectively mapping from the 5-D vector spaces to the 4-D tangent spaces (see lot 170). Though the theory succeeded in deriving the field equations for gravity and electromagnetism from this approach, it could not account for the structure of matter (the existence of charged particles and currents being incompatible with the field equations), hence Einstein's doubts expressed in the accompanying letter.
EINSTEIN, Albert (1879-1955) Typed letter signed ('A. Einstein') to Mrs Allen I. Dunn, Institute for Advanced Study, Princeton, 23 May 1939. In English, half page, 255 x 204mm. Einstein explains his Unified Field Theory in plain English. Writing to a Mrs Dunn, Einstein indicates that he is sending under separate cover 'my paper concerning the unified field theory' for her husband. He goes on to explain the basic idea of his Unified Field Theory and his success with it: 'It is a general scheme that gives hope to understand the structure of the elementary particles. It is not yet known to me whether it will really give the correct solution of the problem, not having been able till now to integrate these equations satisfactorily'. Letters by Einstein in English with such good scientific content are rare on the market. [With:] A. Einstein and P. Bergmann, 'On a generalization of Kaluza's theory of electricity', offprint from Annals of Mathematics, vol.39, no.3, July 1938. Octavo (255 x 175mm). Pp. 683-701 (central vertical creasefold, some faint creasing throughout). Stapled printed self-wrappers (very short split to spine at head,vertical creasefold to wrappers). In 1921, Kaluza proposed a unified field theory by supposing the dimensionality of space-time be enlarged and formal geometry preserved. In 1931, Einstein reformulated Kaluza’s theory by constructing a five-dimensional vector space at each point of four-dimensional space-time, projectively mapping from the 5-D vector spaces to the 4-D tangent spaces (see lot 170). Though the theory succeeded in deriving the field equations for gravity and electromagnetism from this approach, it could not account for the structure of matter (the existence of charged particles and currents being incompatible with the field equations), hence Einstein's doubts expressed in the accompanying letter.
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