Zorn's lemma

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English[edit]

Etymology[edit]

After Max August Zorn 1906-1993, German-born American mathematician. See German Zorn.

Proper noun[edit]

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Zorn's lemma

  1. (set theory) A proposition of set theory stating that every partially ordered set, in which every chain (i.e. totally ordered subset) has an upper bound, contains at least one maximal element.