Pauli discusses the philosophical duality realism-nominalism. He mentions that he is one of those who think that ideas have a reality at least as strong as that of sensations.
Sans titrePauli explains his use of the adjectives "positivistic", "realistic", "idealistic" and "phenomenalistic" as logically linked aspects of the world and as corresponding features of a theory.
Sans titreReferring to Bohr's lecture "On the unity of knowledge", Pauli mentions his misunderstandings with Bohr concerning the concept of the "detached observer", the concept of reality in atomic physics, Bohr's conception of "complementarity" as foundation of a world religion, and the use of the concept "antinomic" (antinomisch).
Sans titreHeisenberg talks about a paper by himself and Ascoli on the fine-structure constant. He comments on a paper by Källén and Glaser in which the V-particle of the Lee-model becomes radioactive, disintegrating into N and $\Theta$.
Sans titreLanczos thanks Pauli for his reply to his letter of 27 Nov, which clarifies the point in question.
Sans titrePauli replies to Heisenberg's letter of 1st January. He is not convinced that dipole-"ghosts" cannot appear in Lee's model and gives some reasons for this.
Sans titreThe letter talks about the "sudden death of parity" in Wu's experiments, problems with nucleon-force data for deuterons and travel plans to Copenhagen, Zürich and Sydney.
Sans titrePauli is excited about the experimental confirmation of parity violation.
Sans titreHeisenberg talks about his recent results giving tentative proof that in all sectors of the Lee model with dipole ghost the S -matrix is unitary.
Sans titre