Highly desirable ALS in German, signed “A. Einstein,” one page, 8.5 x 11, May 18, 1922. A letter of recommendation for Paul Hertz, a professor at the University of Gottingen. In full (translated): “I have known Mr. P. Hertz for many years through his scientific works and personally. He is undoubtedly among the most astute theoretical physicists in Germany, with extensive knowledge of his field and remarkable originality. I would particularly call attention to his extensive general education and his great reliability, which indicate his excellent suitability for a broad range of literary tasks. I hold him in high esteem as an intellectual worker and as a person, and I am convinced that he will satisfactorily complete every task that he undertakes to fulfill.” In fine condition, with central vertical and horizontal folds.
Paul Hertz was a fellow physicist who focused his efforts on electron theory and the foundations of statistical mechanics, which led him into contact with Einstein around 1910 after publishing critical remarks on his work in the subject. This initial combative intellectual relationship grew into friendship and mutual respect—in 1915, Einstein used Hertz's suggestions as a stepping stone in resolving the 'hole argument,' a paradox that troubled him while developing his famous field equations to described the general theory of relativity. In addition to the excellent association between Einstein and Hertz, this letter provides remarkable content related to their scientific endeavors. Pre-certified John Reznikoff/PSA/DNA and RR Auction COA.
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