Addition to the letter of the 27 January 1934.
Sans titreBohr thanks Pauli for his letter which gave him a welcome occasion for a small heart-outpouring. He has recently returned to his old primitive view on the problems of the electron theory after having been alarmed by Pauli's difficulty with the infinite self-energy of the electrons.
Sans titrePauli expresses scepticism about the theory of holes, especially in view of a certain arbitrariness in Dirac's derivations.
Sans titreBohr has sent a manuscript with the preparation of his discussion remarks from Brussels to Langevin. He is sending now another copy to Pauli and he would be very glad to hear his opinion before he gets the proofs. Bohr and Rosenfeld are eagerly awaiting the promised article with Weisskopf. He need not say how pleased he was to hear that there is a possibility of a visit by Pauli to Copenhagen in Spring. Perhaps Heisenberg and Dirac will come too. Bohr's own journey to Russia should take place in the beginning of May, and Margrethe and Rosenfeld will accompany him on the journey.
Sans titrePauli makes some remarks on Dirac's theory, on the mass of the neutron and on the negative protons.
Sans titrePauli replies to Heisenberg's letter concerning e$^{2}$. He gives an outline of how far a future theory will have to differ from the present one in order to avoid infinities.
Sans titrePauli makes two further remarks on theory of holes and e$^{2}$/(h.c.), concerning "Vertauschungsrelationen".
Sans titreHeisenberg replies to Pauli's letters. He writes about a future formulation of field theory, where matter and radiation fields will appear as different properties of the same field. He talks of Pauli's remarks that the exchange relations of electrical and magnetical field strengths have to be modified.
Sans titrePauli discusses details of Heisenberg's last letter of the 11th December. He makes more remarks about nuclear magnetic moments and gives some ideas about the neutron.
Sans titreHeisenberg writes on a talk Heisenberg had with Bohr about the theory of holes. The reason why an arbitrary small value of e$^{2}$/(h.c.) is not realized in nature is given by two deviations from Maxwell's theory which are identical in principle that dependent on pair production and that connected with the deviation from linearity and connected with finite self-energy. He talks on further considerations by Heisenberg. One Hamilton - electron and photon.
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