Der Triumph der Relativitaetstheorie: Bestaetigung der ART
Notes on the Work of A. Friedmann On the Curvature of Space
Albert Einstein, manuscript, published in the Zeitschrift für Physik, 1923, facsimile
This is Einstein’s reply to the publication of the Soviet mathematician Friedmann. Friedmann points out the time-dependent solution of the Einsteinian equations of gravity, which indicates an expanding universe.
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