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Klein's writes about his and Hilbert's view that the specific significance of Einstein's theory is to be found in its physical conception, but that its precise formulation is a purely mathematical problem. He makes further comments about relativity.

Klein writes about the paginated proofs of the article and gives more suggestions.

Kita talks about the behaviour of Heisenberg's S-function. He asks a question about the translation into Japanese of Pauli's handbook-article of 1933.

The letter contains a critical discussion of Heisenberg's quantization of non-linear wave equations.