摘要:In this paper we study the additive functionals of Markov chains via conditioning with respect to both past and future of the chain. We shall point out new sufficient projective conditions, which assure that the variance of partial sums of $n$ consecutive random variables of a stationary Markov chain is linear in $n$. The paper also addresses the central limit theorem problem and is listing several open questions.
关键词:Markov chains; variance of partial sums; central limit theorem; projective criteria