ALS in German, signed “A. Einstein,” one page, 7.25 x 6.75, August 22, 1921. Handwritten letter to a colleague, in part (translated): "The news about my trip to Russia was entirely incorrect…I cannot accept your…invitation as…I can hardly manage to find the necessary rest and incentive for the proper scientific work. May I call your attention to Prof. Dr. Schlick of Rostock, who has made valuable contributions to the Theory from a…philosophical standpoint and has also mastered its physical difficulties." Attractively mounted, cloth-matted, and framed with a portrait to an overall size of 16.25 x 24. In very good to fine condition, with small stains, trimmed edges, and a horizontal mailing fold passing through the signature.
Einstein's theory of relativity—the foundation of modern physics—encompassed his pioneering concepts of special relativity and general relativity, respectively proposed and published in 1905 and 1915. With it came his famed equation, "E = mc2"—the mass-energy relationship—undoubtedly the most well-known equation ever set forth. Moritz Schlick, a physicist, philosopher, and founder of the Vienna Circle, was deeply influenced by Einstein's ideas and saw them as supporting a logical and empirical approach to knowledge. Schlick corresponded with Einstein and sought to interpret relativity within the framework of scientific philosophy, emphasizing clarity and logical analysis. Einstein would receive the 1921 Nobel Prize in Physics for 'his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect.' A remarkable letter by Einstein, referring to his greatest achievement and a fellow thinker's mastery of the subject.
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