Answers are grounded in this paper and cite their sources.
There are some martingales associated with the branching random walk which are natural generalizations of the classical martingale occurring in the Galton–Watson process. Some continuity properties of the distributions of their limits are discussed.
No takes yet. Share an insight, caveat, or question.
Biggins et al. (1979) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: