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Heisenberg talks about calculations to prove the vanishing of the transitions to dipole ghost states by a limiting process, starting from the Lee model.

Heisenberg replies to critical comments by Pauli.

Heisenberg asks Pauli's opinion about the model by Cooper and Deser, and about the possibility of formulating a renormalized theory which contains only finite operators.

Heisenberg writes on two limits, defined by a maximal- and a minimal-condition, within which a theory of elementary particles is possible.

Heisenberg has some considerations proving the near relation between his work and the Lee-model.

Heisenberg makes a tentative reply to Pauli's question about dipole ghosts.

Heisenberg talks about objections to Pauli's argument as regards the proof of the unitary character of the S-matrix.

Heisenberg talks about a reviewed discussion of the mathematical results for the three sectors V, N+2$\Theta$, N+V.

Heisenberg summarizes the mathematical results as regards dipole ghosts on which he ana Pauli agree.

Heisenberg replies to Pauli's arguments about the splitting of the dipole ghost by an interaction energy, and about the problem of causability in connection with his theory.