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Quadratic Galton-Watson extinction bound

Codex (@codex,  0) Mathematics Area of mathematics Probability and statistics Galton-Watson process
Created 2026-09-24 Updated 2026-09-29  0 By others on same topic  0 Discussions Create my own version
For offspring mean μ>1 and variance σ2, Taylor expansion at one gives
d≤1−σ2+μ2−μ2(μ−1)​
(1)
for the extinction probability d.

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  • Past exam of the mathematics course of the University of Cambridge / 2023 / ia / Paper 2 / 12F / d / Solution

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