His Ph.D. was awarded when he was only twenty years old by the University of Göttingen in 1926, where he studied under Hilbert and Courant .
Ang kanyang Ph.D. ay iginawad kapag siya ay lamang loob ng dalawampu't years old ng University of Gottingen sa 1926, kung saan siya-aral sa ilalim ng Hilbert at Courant.