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Path decompositions for Markov chains

Gotz Kersting, Kaya Memisoglu

math.PRarXiv:math/0410142

Abstract

We present two path decompositions of Markov chains (with general state space) by means of harmonic functions, which are dual to each other. They can be seen as a generalization of Williams' decomposition of a Brownian motion with drift. The results may be illustrated by a multitude of examples, but we confine ourselves to different types of random walks and the Polya urn.

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