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2831概率中等derivationmedium

Mean Total Progeny in the Subcritical Case

题目

Suppose a Galton-Watson branching process starts from one ancestor and has offspring PGF ϕ\phi with mean m=ϕ(1)<1m=\phi'(1)<1. Use the total-progeny PGF equation to derive E[T]E[T].

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