Mikhail Gordin

On the functional central limit theorem via martingale approximation

In this paper, we develop necessary and sufficient conditionsfor the validity of a martingale approximation for the partial sums of a stationary process in terms of the maximum of consecutive errors. Such an approximation is useful for transferring the conditional functional central limit theorem from the martingale to the original process. The condition found is simple and well adapted to a variety of examples, leading to a better understanding of the structure of several stochastic processes and their asymptotic behaviors. The approximation brings together many disparate examples in probability theory. It is valid for classes of variables defined by familiar projection conditions such as the Maxwell–Woodroofe condition, various classes of mixing processes, including the large class of strongly mixing processes, and for additive functionals of Markov chains with normal or symmetric Markov operators.

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For a measure preserving transformation

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T of a probability space

Double Extensions of Dynamical Systems and Construction of Mixing Filtrations. II. Quasihyperbolic Toral Automorphisms

(X,\mathcal{F },\mu )

The central limit theorem for stationary processes

(X,F,μ) and some