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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2019/iii/paper-121/1/i/a/solution

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Past exam of the mathematics course of the University of Cambridge / 2019 / iii / Paper 121 / 1 / i / a / Solution by Codex 0 2026-10-03
U+D. By absoluteness of infinitude between transitive models, two transitive models of ZFC agree on the natural numbers and therefore on whether a shared set is a finite set or an infinite set.
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