# On the central and local limit theorem for martingale difference sequences

Research paper by Mohamed El Machkouri, Dalibor Volny

Indexed on: 28 Feb '04Published on: 28 Feb '04Published in: Mathematics - Probability

#### Abstract

Let $(\Omega, \A, \mu)$ be a Lebesgue space and $T$ an ergodic measure preserving automorphism on $\Omega$ with positive entropy. We show that there is a bounded and strictly stationary martingale difference sequence defined on $\Omega$ with a common non-degenerate lattice distribution satisfying the central limit theorem with an arbitrarily slow rate of convergence and not satisfying the local limit theorem. A similar result is established for martingale difference sequences with densities provided the entropy is infinite. In addition, the martingale difference sequence may be chosen to be strongly mixing.