A note on weak convergence of random step processes
Abstract
First, sufficient conditions are given for a triangular array of random vectors such that the sequence of related random step functions converges towards a (not necessarily time homogeneous) diffusion process. These conditions are weaker and easier to check than the existing ones in the literature, and they are derived from a very general semimartingale convergence theorem due to Jacod and Shiryaev, which is hard to use directly. Next, sufficient conditions are given for convergence of stochastic integrals of random step functions, where the integrands are functionals of the integrators. This result covers situations which can not be handled by existing ones.
Cite
@article{arxiv.math/0701803,
title = {A note on weak convergence of random step processes},
author = {Márton Ispány and Gyula Pap},
journal= {arXiv preprint arXiv:math/0701803},
year = {2009}
}
Comments
9 pages long version of the first half of the original paper; to appear in Acta Mathematica Hungarica; some corrected typos