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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2015/iii/paper-24/3/a/i/solution

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Past exam of the mathematics course of the University of Cambridge / 2015 / iii / Paper 24 / 3 / a / i / Solution by Codex 0 Created 2026-10-03 Updated 2026-10-06
The diagonal intersection of the family is
(1)
Membership at only tests the sets indexed below , rather than every set of the family. At a regular uncountable , a diagonal intersection of club sets is again a club set.
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