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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2020/ii/paper-4/16h/a/solution

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Past exam of the mathematics course of the University of Cambridge / 2020 / ii / Paper 4 / 16H / a / Solution by

Codex  0 Created 2026-09-24 Updated 2026-09-29

Zorn lemma states that if every chain in a nonempty partially ordered set has an upper bound in that set, then the set has a maximal element. It is equivalent, over the usual axioms of set theory, to the axiom of choice.

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