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In page Käte Fenchel:

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As a result, Käte pursued an alternative career in mathematics education.[citation needed] After graduation, she began working at a job teaching mathematics at a German high school from 1931 to 1933 when Adolf Hitler and the Nazis rose to power in Germany. Käte lost her job because she was a Jew, as did Werner Fenchel, another German-born Jewish mathematician, who was removed from his teaching position in Göttingen.[1]