Editing Ernst Zermelo (section)

==Life==
[[File:Ernst Zermelo.jpeg|thumb|Ernst Zermelo in Freiburg (1953)]]
Ernst Zermelo graduated from Berlin's Luisenstädtisches Gymnasium (now {{Interlanguage link multi|Heinrich-Schliemann-Oberschule|de|3=Heinrich-Schliemann-Oberschule (Gymnasium)|lt=Heinrich-Schliemann-Oberschule}}) in 1889. He then studied [[mathematics]], [[physics]] and [[philosophy]] at the [[University of Berlin]], the [[University of Halle]], and the [[University of Freiburg]]. He finished his doctorate in 1894 at the University of Berlin, awarded for a dissertation on the [[calculus of variations]] (''Untersuchungen zur Variationsrechnung''). Zermelo remained at the University of Berlin, where he was appointed assistant to [[Max Planck|Planck]], under whose guidance he began to study [[hydrodynamics]]. In 1897, Zermelo went to the [[University of Göttingen]], at that time the leading centre for mathematical research in the world, where he completed his [[habilitation thesis]] in 1899.

In 1910, Zermelo left Göttingen upon being appointed to the chair of mathematics at the [[University of Zurich|University of Zurich]], which he resigned in 1916.
He was appointed to an honorary chair at the [[University of Freiburg]] in 1926, which he resigned in 1935 because he disapproved of [[Adolf Hitler]]'s regime.<ref>{{cite book |last1=Kaplansky |first1=Irving |title=Set Theory and Metric Spaces |date=2020 |publisher=American Mathematical Society |location=Providence |isbn=978-1-4704-6384-7|pages=36–37}}</ref> At the end of [[World War II]] and at his request, Zermelo was reinstated to his honorary position in Freiburg.

[[File:Ernst Zermelo Günterstal.jpg|thumb|Ernst Zermelo tombstone in Friedhof Günterstal, in Günterstal district of Freiburg im Breisgau]]