In Göttingen, he followed the courses of Felix Klein, David Hilbert and Edmund Landau, and got to know Herman Weyl, his future colleague at ETH Zürich.
Sa Gottingen, siya sinundan ang mga kurso ng Felix Klein, David Hilbert at Edmund Landau, at nakuha sa kung Herman Weyl, ang kanyang hinaharap kasamahan sa ETH Zürich.