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This letter from Casimir is accompagnied by an offprint by Casimir and B L van der Waerden "Algebraischer Beweis der vollständigen Reduzibilität der Darstellungen halbeinfacher Liescher Gruppen" (in: Math. Ann. : 111 (1935), pp.1-12). The letter contains a short reference to mathematical problems, experimental results on supraconductivity and personal remarks on Kronig.

Born expresses a great interest in Pauli's paper on Eyl's theory and agrees in particular to his remark that continuum theory cannot be applied to the interior of the electron because of the introduction of quantities which are in principle unobservable. He suggests to Pauli to prove that the surface energy of NaCl cube is smaller than that of any other surface.