The war made it impossible for him to begin an academic career at this stage and he also had to leave his position as editor of the Jahrbuch über die Fortschritte der Mathematik in 1939.
Ang mga digmaan ginawa ito imposible para sa kanya upang magsimula ng isang academic karera sa yugto na ito at siya din ay umalis sa kanyang posisyon bilang editor ng Jahrbuch über die Fortschritte der Mathematik sa 1939.