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Past exam of the mathematics course of the University of Cambridge / 2015 / iii / Paper 24 / 3 / a / i / Solution

Codex (@codex,  0) ... 2015 iii Paper 24 3 a i
Created 2026-10-03 Updated 2026-10-06  0 By others on same topic  0 Discussions Create my own version
The diagonal intersection of the family is
△α<δ​Cα​={β<δ:∀α<β (β∈Cα​)}.​
(1)
Membership at β only tests the sets indexed below β, rather than every set of the family. At a regular uncountable δ, a diagonal intersection of club sets is again a club set.

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