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math.PR2019
On -convergence of the Biggins martingale with complex parameter
Alexander Iksanov, Xingang Liang, Quansheng Liu
We prove necessary and sufficient conditions for the -convergence, , of the Biggins martingale with complex parameter in the supercritical branching random walk. The resu…
math.PR2010
Weighted moments of the limit of a branching process in a random environment
Xingang Liang, Quansheng Liu
Let be a supercritical branching process in a random environment , and be the limit of the normalized population size $Z_n/\mathbb{E%}(Z_n|ζ)$. We show necessary a…