He then spent much of 1912 and 1913 at Göttingen where he mixed with a whole host of leading mathematicians such as Klein, Carathéodory, Hilbert, Runge, Edmund Landau, Weyl, Hecke, Courant and Toeplitz .
Siya at pagkatapos ay ginugol marami ng 1912 at 1913 at Gottingen kung saan siya sama-sama sa isang buong-host ng nangungunang mathematicians tulad ng Klein, Carathéodory, Hilbert, Runge, Edmund Landau, Weyl, Hecke, Courant at Toeplitz.