Diploma [?] of H. H. Euler, directed by W. Heisenberg. Light in Dirac's theory.

Excerpt of a text by L. Boltzmann.

Letter relating to the professorship of Pauli in Hamburg.

Letter from Teubner Verlagsgesellschaft to W. Pauli. Linked to the publication of "The theory of relativity".

Heisenberg writes about his work on ferromagnetism. There are three approximations: 1)free electrons with Fermi-statistics, 2)Bloch's approximation of lattice potentials, 3)Heitler-London approximation of exchange of valency electrons of two atoms in the third approximation.

Heisenberg writes about Pauli's remarks on the H theorem in the case of the interaction of several oscillators and the connection with Dirac's theory.

Heisenberg writes about calculations about the theory of holes and on the self-energy of a particle. He replies to Pauli's question about the scattering of neutrons by protons and the difference between exchange forces and regular forces. He writes on the decay of the neutron and on his discussion with Bloch about the spin of the neutron being opposite to that of the proton.

Heisenberg writes about charge density and finiteness of self-energy.

Heisenberg gives detailed calculations to show that their simple method of incorporating the theory of holes into quantum electrodynamics leads to good results.

Heisenberg writes on the final results of the theory of holes. The whole scheme can be transposed into the quantum theory of waves. He talks about signs of a deeper connection between matter-field and radiation-field.