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Matematicheskie Zametki, 1971, Volume 9, Issue 1, Pages 93–103
(Mi mzm9648)
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This article is cited in 2 scientific papers (total in 2 papers)
Some remarks concerning the individual ergodic theorem of information theory
B. S. Pitskel' M. V. Lomonosov Moscow State University
Abstract:
Let $(X,\mu,T)$ be an ergodic dynamic system and let $\xi=(C_1,C_2,\dots)$ be a discrete decomposition
of $X$. Conditions are considered for the existence almost everywhere of
$$
\lim_{n\to\infty}\frac1n|\log\mu(C_{\xi n}(x))|,
$$
where $C_{\xi n}(x)$ is the element of the decomposition $\xi^n=\xi\vee T\xi\vee\dots<T^{n-1}\xi$ containing $x$.
It is proved that the condition $H(\xi)<\infty$ is close to being necessary.
If $T$ is a Markov automorphism and $\xi$ is the decomposition into states,
then the limit exists, even if $H(\xi)=\infty$, and is equal to the entropy of the chain.
Received: 19.11.1969
Citation:
B. S. Pitskel', “Some remarks concerning the individual ergodic theorem of information theory”, Mat. Zametki, 9:1 (1971), 93–103; Math. Notes, 9:1 (1971), 54–60
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https://www.mathnet.ru/eng/mzm9648 https://www.mathnet.ru/eng/mzm/v9/i1/p93
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