# Zorn's lemma

Definition from Wiktionary, the free dictionary

## English[edit]

### Etymology[edit]

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

### Proper noun[edit]

- (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.