Seifert and Threlfall also spent vacations together working on mathematics but of course it was to Leipzig that Seifert submitted his dissertation Topology of 3-dimensional fibred spaces on 1 February 1932 and he was awarded his doctorate of philosophy after his oral examination on 3 March.
Seifert at Threlfall din nagastos vacations magkasama nagtatrabaho sa matematika ngunit ng kursong ito ay sa Leipzig na Seifert na isinumite sa kanyang disertasyon Topology ng 3-dimensional ang himaymay puwang sa 1 Peb 1932 at siya ay iginawad sa kanyang titulo ng doktor ng pilosopiya pagkatapos ng kanyang bibig na pagsusuri sa March 3.