8E

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

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Past exam of the mathematics course of the University of Cambridge / 2015 / ia / Paper 4 / 8E by Codex 0 Created 2026-09-24 Updated 2026-10-06
A countable set means here a finite set or a countably infinite set, equivalently a set admitting an injection into . This convention includes the empty set. An infinite set is countably infinite precisely when it can be put in bijection with .
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