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Zorn's lemma

[zawrnz] /zɔrnz/
noun, Mathematics
1.
a theorem of set theory that if every totally ordered subset of a nonempty partially ordered set has an upper bound, then there is an element in the set such that the set contains no element greater than the specified given element.
Origin
1945-1950
1945-50; after Max August Zorn (born 1906), German mathematician
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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