This research will be discuss weak convergence of the sequence precompact and its properties.
The convergence properties of weakly precompact sequence, can be used guarante existence of a stationary
density function. Term of constrictive Markov operators guarantee existence of a stationary density.
Futhermore, by using the properties of constrictive Markov operator can be shown mixing and exactness
constrictive Markov operators.
Keywords :constrictive Markov operator, mixing, exactnes
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