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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.

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

Pauli replies to Thellung's letter of the 19th January 1956. He agrees with his view on the renormalization of the meson charge. He writes about the problems of higher approximations and about Rohrlich's work on the electrodynamics of charged scalar mesons.