Random walk;
2-dimensional comb;
Strong approximation;
2-dimensional Wiener process;
Local time;
Laws of the iterated logarithm;
Iterated Brownian motion;
BROWNIAN-MOTION;
INCREMENTS;
THEOREMS;
SITES;
BIG;
LAW;
D O I:
10.1016/j.spa.2011.01.009
中图分类号:
O21 [概率论与数理统计];
C8 [统计学];
学科分类号:
020208 ;
070103 ;
0714 ;
摘要:
We study the path behaviour of general random walks, and that of their local times, on the 2-dimensional comb lattice C-2 that is obtained from Z(2) by removing all horizontal edges off the x-axis. We prove strong approximation results for such random walks and also for their local times. Concentrating mainly on the latter, we establish strong and weak limit theorems, including Strassen-type laws of the iterated logarithm, Hirsch-type laws, and weak convergence results in terms of functional convergence in distribution. (C) 2011 Elsevier B.V. All rights reserved.