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This chapter is devoted to the fundamental concept of irreducibility: the idea that all parts of the space can be reached by a Markov chain, no matter what the starting point. Although the initial results are relatively simple, the impact of an appropriate irreducibility structure will have wide-ranging consequences, and it is therefore of critical importance that such structures be well understood.
KeywordsRandom Walk Positive Probability Half Line General State Space Countable Space
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