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# Zermelo, Ernst Friedrich Ferdinand

1871 – He was born on the 27th of July in Berlin, German Empire.

1889 – He graduated from Berlin’s Luisenstädtisches Gymnasium.

1894 – He then studied mathematics, physics and philosophy at the universities of Berlin, Halle and Freiburg and finished his doctorate at the University of Berlin. And he was awarded for dissertation on the calculus of variations.

1897 – He went to Gottingen world’s leading mathematical research.

1899 – He was able to complete his habilitation thesis.

1900 – He challenged the mathematical community with his famous Hilbert's problems, in the Paris conference.

1902 – He published his first work concerning the addition of transfinite cardinals.

1904 - He succeeded in taking the first step suggested by Hilbert towards the continuum hypothesis when he proved the well-ordering theorem.

1905 – This brought fame to him, who was appointed Professor in Göttingen.

1908 - He succeeded in producing a much more widely-accepted proof, and then he published his results despite his failure to prove the consistency of his axiomatic system.

1910 – He was appointed as the chairman of mathematics at the Zurich University.

1916 - He resigned from the position.

1926 – He was appointed to an honorary chair at Freiburg in Breisgau in 1926.

1935 – He resigned again from the position, because he disapproved of Hitler's regime. At the end of World War II and at his request, he was reinstated to his honorary position in Freiburg.

1953 – He died at the age of 82 in Freiburg, Breisgau.

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