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- W1996280157 abstract "We study the notion of the scaled entropy of a filtration of $sigma$-fields (= decreasing sequence of $sigma$-fields) introduced by the first author ({V4}). We suggest a method for computing this entropy for the sequence of $sigma$-fields of pasts of a Markov process determined by a random walk over the trajectories of a Bernoulli action of a commutative or nilpotent countable group (Theorems~5,~6). Since the scaled entropy is a metric invariant of the filtration, it follows that the sequences of $sigma$-fields of pasts of random walks over the trajectories of Bernoulli actions of lattices (groups ${Bbb Z}^d$) are metrically nonisomorphic for different dimensions $d$, and for the same $d$ but different values of the entropy of the Bernoulli scheme. We give a brief survey of the metric theory of filtrations, in particular, formulate the standardness criterion and describe its connections with the scaled entropy and the notion of a tower of measures." @default.
- W1996280157 created "2016-06-24" @default.
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- W1996280157 date "2007-06-19" @default.
- W1996280157 modified "2023-09-27" @default.
- W1996280157 title "Scaled entropy of filtrations of $sigma$-fields" @default.
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