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Non-linear wave propagation equations.

Report on recent developments in a non linear spinor theory of matter.

W. Heisenberg wrote to H. Kita about some mathematical problems he encountered (wrong sign in an equation and possibility of omission of a term in a conventional derivation of the Bethe-Salpeter equation). See also 1/530.

Answer to a letter from H. Kita where he pointed out a mathematical mistake in one of Heisenberg's calculations for a book or an article. See also 1/463 and 1/532.

Heisenberg is happy to see that he and Källén agree on some mathematical points (S-Matrix, Hilbertraum I, Lee-Model).

Copy and corrections of a speech held at Geneva by Heisenberg, copy sent to Pauli.

Heisenberg writes on the anomalous Zeeman effect.

Heisenberg writes about Pauli's remarks on a paper by Born and Heisenberg.

Heisenberg writes on technicalities about a possible meeting between him and Pauli.

Heisenberg writes about the polarization of spectral lines in electric and magnetic fields according to quantum theory.