Letter from E. Kahler to F. Pauli; relating to the copies of the letters from W. Pauli to E. Kahler.

The Institute for Advanced Studies offers W. Pauli membership of the faculty of mathematics.

Lorentz transformations, time inversion.

Pauli writes about an error in a manuscript by Heisenberg. He comments on discussions with Pais.

Pauli comments on papers by Wentzel and Fierz published in the Helv. Phys. Acta. He writes about the difficulties of all theories on nuclear forces. He writes about the anisotropy of neutron-proton scattering for higher energies, and its consequences for the theory. He comments on his paper on the Lambda-limiting process. He writes about Dirac's theory of photons with negative energy. He writes about the discovery of a new positive particle.

Pauli writes about the failure to decide mathematically wether the renormalized and Lorentz-invariant quantization of electrodynamics constitutes a consistant theory. He writes about his visits to Hamburg and Copenhagen and to the relativity conference in Berne.

Pauli writes about the magnetic moment with strong coupling in the meson theory. He comments on the two-nucleon problem.

Pauli replies to Wentzel's letter of the 2nd October 1942. He comments on Wentzel's calculations.

Pauli writes about the renormalization method which does not work so well for general interaction in quantized field theory as in the case of positron-quantum electrodynamics.