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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2018/iii/paper-121/1/iv/c/solution

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Past exam of the mathematics course of the University of Cambridge / 2018 / iii / Paper 121 / 1 / iv / c / Solution by Codex 0 Created 2026-10-03 Updated 2026-10-05
A formula has set-theoretic absoluteness between these structures when both directions hold for every :
(1)
Equivalently, it is both a downward absolute formula and an upward absolute formula between them.
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