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Albert Einstein Autograph Letter Signed (containing Three Handwritten Formulas)

   Albert Einstein autograph letter signed. Significant ALS, written in German to mathematician Ernst Gabor Straus, signed A. 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 ...