Some articles on communicating class, communicating, class:
... A set of states C is a communicating class if every pair of states in C communicates with each other, and no state in C communicates with any state not in C ... be shown that communication in this sense is an equivalence relation and thus that communicating classes are the equivalence classes of this relation ... A communicating class is closed if the probability of leaving the class is zero, namely that if i is in C but j is not, then j is not accessible from i ...
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