Zorn's lemma

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Science and technology

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What Wikipedia says

Zorn's lemma, also known as the Kuratowski–Zorn lemma, is a proposition of set theory. It states that a partially ordered set containing upper bounds for every chain (that is, every totally ordered subset) necessarily contains at least one maximal element.

Excerpt from the Wikipedia article “Zorn's lemma”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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