When1: 1904
When2: 1908
Who: Ernst Zermelo [Zermelo, Ernst]
What: mathematician
Where: Germany
Detail: He lived 1871 to 1956 and invented Zermelo-Fraenkel set theory [1904 to 1908]. Infinite sets can contain sets with no elements in common. Methods to choose one element from each set must exist {axiom of choice, Zermelo}. If sets have no defined choice function, sets must use axiom of choice.
Mathematical Sciences>Mathematics>History>Set Theory
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Date Modified: 2022.0224