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Heisenberg talks about the univalent definition of the Lagrangian by the groups and about the mirror problem.

Heisenberg writes about his trouble with the journalists and the statement he has made for the press. He talks about recent results of his calculations.

Heisenberg writes about the progress of his work, together with Dürr, Schliederand Yamasaki. They are going to describe the theory for nucleons and Pi-mesons. Heisenberg gives an explanation of their ideas.

Heisenberg encloses a manuscript discussing certain properties of the propagation function of the non-linear wave equation. He asks for Pauli's opinion.

Heisenberg explains certain formulae in the manuscript on quantum electrodynamics. He replies to questions by Pauli on the symmetry of conservation laws, on a stronger approximation to Pauli's and Jordan's formalism and on the meaning of certain values for the self-energy of particles.

Heisenberg writes on excitation times and line widths.

Heisenberg asks for Pauli's opinion on his Zeeman effect paper.

Heisenberg writes about progress in quantum mechanics, Born's and Jordan's contribution and mathematical representation of the new formalism.

Heisenberg writes about the quantum conditions for several degrees of freedom.

Heisenberg thanks Pauli for his book (Hand-Buch-Article). He writes against Schrödinger's conception which throws all quantum theoretical phenomena over board and about Wien's agreement with Schrödinger's attitude.