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## Albert Einstein autograph letter signed (containing formulas for a centro-symmetric solution in the theory of general relativity)

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Significant ALS, written in German to mathematician Ernst Gabor Straus, signed “A. E.” at the bottom. The letter contains three calculation formulas for a centro-symmetric solution in the theory of general relativity. In part (translated): "I have the thing calculated with centrally symmetric, and it shivers me that you must have made a miscalculation after the introduction of the specialisations for the coordinate system I find without prejudice to the condition? S"=0 has the expression…" He has recalculated the centro-symmetric formula and it seems to him that Straus had made a miscalculation. He inscribes two lines of formulas, commenting: “Therefore, if I have not fallen victim to an error myself, the calculation of the centro-symmetric case must be resumed. On the basis of the notation [formula]…I’m at risk of miscalculations and not convinced that this result is correct." However, he wants to point out this problem so that Straus does not study the problem on a possibly incorrect basis and does not digress; and, if in the centro-symmetric solution the functions remain arbitrary, they must try to change the basis. In fine condition with two horizontal mailing folds. One page, 8.5 x 11 inches, no date.

Ernst Gabor Straus (1922–1983), born in Munich, had fled Nazi persecution and studied mathematics in Palestine at the University of Jerusalem, then in the United States. In 1944 he became Einstein's assistant at the Princeton Institute of Advanced Study, bringing important aid to the physicist as Straus formulated a mathematical framework for Einstein's concepts. They co-authored three papers and brought together many of Einstein's old publications. It was during their collaboration that a new idea was conceived in the search for a theory of the unified field, which they called 'Complex Theory.' The complex theory was distinguished from earlier approaches by the use of a metric tensor with complex values rather than the real tensor of general relativity. Papers were edited, rejected, and reworked before being published in 1948. An important scientific letter from Einstein containing handwritten formulas related to his search for a unified field theory.

Ernst Gabor Straus (1922–1983), born in Munich, had fled Nazi persecution and studied mathematics in Palestine at the University of Jerusalem, then in the United States. In 1944 he became Einstein's assistant at the Princeton Institute of Advanced Study, bringing important aid to the physicist as Straus formulated a mathematical framework for Einstein's concepts. They co-authored three papers and brought together many of Einstein's old publications. It was during their collaboration that a new idea was conceived in the search for a theory of the unified field, which they called 'Complex Theory.' The complex theory was distinguished from earlier approaches by the use of a metric tensor with complex values rather than the real tensor of general relativity. Papers were edited, rejected, and reworked before being published in 1948. An important scientific letter from Einstein containing handwritten formulas related to his search for a unified field theory.

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