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Källén proves a mathematical identity and he dicusses the properties of a function.

Källén proves a mathematical identity and he dicusses the properties of a function.

Weisskopf writes about Pryce in New College, Oxford, who is interested in ESP. He believes it still has to be proved that the specific entropy in living beings diminishes with evolution . He doesn't believe in the possibility of a numerical evaluation of evolution-probabilities.

Thirring makes calculations on Raman's scattering for certain conditions in Lee's model.

Källén talks about calculations as regards the non-unitarity of the S-matrix in the Lee model.

Källén writes on certain mathematical problems of the Lee model.

Pauli asks Klein to speed up his contribution to the Bohr Festschrift. He talks about confrontation in Princeton between Lee and Källén. Pauli gives results of the Källén-Pauli study of Lee's model.