2 5 6 D O C . 3 0 6 F E B R U A R Y 1 9 2 0 Your equation (2) refers to the problem: What is the run- ning frequency ν, judging from K, of a clock at rest relative to , which has the frequency relative to ? The answer is provided by your equation (2) . . . . (2) Your equation (3) refers to the question: Relative to , a train of light waves moving along a plane in a vacuum is given by the frequency (with reference to ) whose direction of propagation is to the x-a[xis]. What is frequency ν of this wave train with refer- ence to K? Answer: . . . (3) And now you assert, you rascal (which is what you a[lways] were), that these two results are in contradiction with each other! But two entirely different problems are involved and the only thing either problem has in common is that a quantity, which you designate as ν, appears.– The line shift follows very strictly from the general theory of relativity and will soon be confirmed.[2] In two years no one will doubt it anymore. I really did not have any chance to come and see you [in] Bern, as last year I had to spend every free minute with my ailing mother in Lucerne.[3] I hope I can ar- range it this [summer]. With best regards to you and your wife,[4] yours, Einstein. 306. To Berlin-Schöneberg Office of Taxation [Berlin,] 10 February 1920 Finanzamt, Schöneberg, Berlin, 12 Innsbrucker St. Enclosed I return the blank copy of the tax declaration form regarding the capital gains war tax, being of the opinion that I am not liable for this tax. As I am not in- formed enough to be sure, I would like to present my case here briefly.[1] I am Swiss, here in Berlin since the spring of 1914. My capital at that time amounted to about 10000 marks. On 30 June 1919 my capital in cash amounted to 37000 marks, offset, however, by a deduction of 4000 francs (Swiss currency) of debts that I owe to my divorced wife and which exceed the gains.[2] U′ K′ y K ν x K′ ν′ K′ ν ν′ 1 α2 –= K′ ν′ K′ ν ν′ 1 α2 ------------------ -=
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