More than this, however, as well as world leaders in mathematics such as Hilbert, it had some of the leading topologists in the world. Hopf was a Privatdozent at Göttingen and he had just returned from an exciting year at Princeton with Aleksandrov .
Higit sa na ito, gayunman, pati na rin ang lider ng mundo sa matematika tulad ng Hilbert, ito ay ilan sa mga nangungunang topologists sa mundo. Hopf ay isang Privatdozent sa Gottingen at niya lamang ibabalik mula sa isang nakapupukaw na taon sa Princeton sa Aleksandrov.