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1419réf. 5735KBerlin: Verlag der Akademie der Wissenschaften in commission at Georg Reimer Reichsdruckerei 14th March 1927. Near Fine. Imperial 8vo 25 4: 18 2 cm. 8 pages numbered 23-30. Letterpress on machine paper in original publisher’s brochure on orange stock with black title printing. First offprint in the original wrappers of Einstein's paper on the important findings of German mathematician and physicist Theodor Kaluza about gravitation and electricity. - Content: Kaluza ""attempted to unify Einstein's theory of gravity with Maxwell's theory of light by mixing them in a fifth dimension"". Together with the Swedish theoretical physicist Oskar Klein Kaluza produced the „Kaluza-Klein field equations"" Calaprice Einstein Almanac 135. Their insights however were ""neglected for many years as attention was directed towards quantum mechanics. Their idea that fundamental forces can be explained by additional dimensions did not re-emerge until string theory was developed"" Wikipedia. - Condition: Mint. - Reference: Boni-Russ-L. 170; Schilpp-Shields 212; Weil 156. Verlag der Akademie der Wissenschaften (in commission at Georg Reimer [Reichsdruckerei]) unknown