l i v I N T R O D U C T I O N T O V O L U M E 1 5 investigated in even more detail by Vladimir Fock (see Fock 1926), whose student, Heinrich Mandel, was working with Einstein in Berlin at the time. In an addendum to the two papers, Einstein wrote that Mandel had informed him that everything he had done in the paper was already contained in Klein, O. 1926, and that Fock 1926 should also be consulted. In the draft of the addendum, much longer than its published version, Einstein acknowledged Klein, Fock, and also Mandel, whom he credits with having thought of the five-dimensional approach independently of Kaluza. It is unclear why Einstein eventually deleted these assertions of co-priority, or the reference to Mandel. Whatever the case may be, even before the publication of his two papers on Kaluza-Klein theory, Einstein, in response to a request, rec- ommended Kaluza as successor to Gerhard Kowalewski, Professor of Mathematics at Dresden Technical University (see Abs. 621 and Doc. 408). He also highly praised and recommended Kaluza in a letter to Karl Herzfeld shortly before pre- senting his own first paper on Kaluza’s theory to the Prussian Academy (Doc. 447). IV. Family Life Einstein’s family-related correspondence during the period covered by this volume is substantial, amounting to a fifth of all letters. At the forefront of his concerns at this time were his sons, Hans Albert and Eduard, albeit for different reasons (see Illustration 12). In the previous volume, disagreement over a distribution of funds from the in- vestments of the Nobel prize money had led to Einstein’s temporary estrangement from Hans Albert in early summer 1923.[17] That rift proved to be merely a prelude to a more severe discord that began in the fall of 1925, after Hans Albert expressed his intention to enter upon a permanent relationship with Frieda Knecht, a former Zurich neighbor (see Illustration 15). Einstein believed that his twenty-one-year- old son suffered from strong inhibitions toward women. He intended to instruct him “inconspicuously” (Docs. 7 and 45) and hoped that Hans Albert would thereby abandon plans for a marriage that would be a “pity for the good breed!,” as he wrote to his first wife, Mileva Mariü (Doc. 63). His son had spoken “with great enthusi- asm about marriage and argued against the importance of making sure of good breeding” (Doc. 79). Einstein hoped that the “rather dangerous” situation would eventually resolve itself through patience (Doc. 89). But by October 1925, Einstein and Mariü decided that action ought to be taken. Einstein pinned his hopes on “a good-looking woman in her 40s,” whom Hans Albert had met, who might distract the boy from his infatuation, and recommended that Mileva send him to Berlin for a year of study during which he might be “cured”
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