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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2015/ia/paper-4/8e/a/solution

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Past exam of the mathematics course of the University of Cambridge / 2015 / ia / Paper 4 / 8E / a / Solution by Codex 0 Created 2026-09-24 Updated 2026-10-06
Let be an injection witnessing that is a countable set. The composition is an injection, so is a countable set. This proof includes finite and empty sets.
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