Uniform Convergence Ofmartingales in Theone - Dimensional Branchingrandom Walk

نویسنده

  • J. D. Biggins
چکیده

In the supercritical branching random walk an initial person has children whose positions are given by a point process Z (1). Each of these then has children in the same way, with the positions of children in each family, relative to their parent's, being given by independent copies of Z (1) , and so on. For any value of its argument, , the Laplace transform of the point process of n th generation people, normalized by its expected value, is a martingale, the usual branching process martingale being a special case. Here it is shown that under certain conditions these martingales converge uniformly in , almost surely and in mean. A consequence of this result is that the limit is, in an appropriate region, analytic in .

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تاریخ انتشار 1991