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Pauli asks questions about the non-occurence of $\pi \to e+v$ and $\pi e+v+photon$. He talks about Heisenberg's work and his idea that the real world results from a bi-section of a $\gamma$-invariant world, for non-zero rest mass and for the neutrino a leptonic charge.

Pauli clarifies additions to the last letter. On the CTP-theorem and the idea of regarding antiparticles as mirror images of particles.

Pauli writes on the significance of the case of the double root in quantized field theory.

Pauli discusses Heisenberg's formulae in his letter of the 13 September 1957.

Pauli asks questions about the reactions $\pi \to \mu + \nu$ and $\pi e + \nu$. He comments papers by Sakurai and Havana (in: Progr. Theor. Phys. : 17 (1957), pp.592).

Pauli dicusses the alternative dipole ghosts or complex roots. He writes on difficulties in the case of Lorentz-invariant interactions. The Tamm-Dancoff approximations are not sufficient in this case.

Heisenberg talks about a detailed report on his calculations, starting with Langrangian.