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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2020/ii/paper-3/6b/i/solution

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Past exam of the mathematics course of the University of Cambridge / 2020 / ii / Paper 3 / 6B / i / Solution by Codex 0 Created 2026-09-24 Updated 2026-10-03
Adding the three equations of the SIR model with waning immunity gives
(1)
Hence conservation of population holds: is an integral of motion.
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