He recovered, despite the problems of obtaining suitable food, in time to begin his university studies. During the summer of 1920 Heisenberg was, as he had been for some time, intending to study pure mathematics at university.
Sa 1918 siya ipinasok Birkbeck College bilang isang gabi na mag-aaral (ang College na dati ay kilala bilang London Mechanic's institusyon at sa 1920 ay kinikilala bilang isang paaralan ng University of London para sa gabi at part-time na mag-aaral).