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Person

Felix Hausdorff

A man with gray hair, glasses, and a mustache wearing a black suit, white shirt, and bow tie, with a dark background.

German mathematician (1868–1942), a founding figure of modern topology and set theory. His 1914 textbook Grundzüge der Mengenlehre set the field's modern shape and contained the paradox that bears his name, the immediate ancestor of Banach-Tarski. A Jewish academic in Bonn under the Nazi regime, he and his wife took their own lives in 1942 on the eve of their deportation to the Endenich camp.

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