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About various topics concerning Källén, Symanzik, Jordan, Krolikowski, etc.

Pauli writes about the eigenvalue problem in formal systems without given Hamiltonian and interchange relations (Vertauschungsrelationen), on which, to his opinion, the future of the spinormodel depends.

Pauli asks if dispersion relations can be applied to weak interactions problems.

Pauli refers to the discussion between Symanzik and Källén.

Pauli comments on Symanzik's preprint on dispersion relations.

Pauli asks questions about the possibility of eliminating the concept of Lagrangian and the corresponding field equations from the formalism of quantized fields. He also writes about corresponding invariants.