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The letter asks further question about the same model discussed in his letter of 14 Nov, concerning impact cross-section of suchparticles.

The letter gives a short evaluation of the political situation, in connection with Kemmer's doubts about England. He replies to some physics points raised by Kemmer.

Pauli asks questions about the algebraic properties of certain relations and makes some remarks about spin operator.

The letter contains detailed discussions of systems of hyper-complex numbers

Addition to the former letter.

Pauli wants to continue his work with Kemmer on systems of hyper-complex numbers. He asks questions about application of quantum theory (perturbation) and on scattering of neutral mesons.

Pauli continues with his calculations with hyper-complex numbers. He adds some remarks on "neutretto"-scattering and the theory of mesons.

A short addendum to the last letter.

Pauli thanks him for his letter of 26 Dec. He would like to hear more from him about Heisenberg's S-function. He writes about the translation of Pauli's handbook article into Japanese.

Pauli talks about reasons for writing to Klein and not to Bohr, involvement with Heisenberg in field theory, Heisenberg's "artificial" solution of the commutation problem, difficulty with continuous beta-decay energy, and shortcomings of the field theory.