Binary sequences with a Cesàro limit

The Cesàro limit - the asymptotic average of a sequence of real numbers - is an operator of fundamental importance in probability, statistics and mathematical analysis. To better understand sequences with Cesàro limits, this paper considers the space $\mathcal{F}$ comprised of all binary sequences with a Cesàro limit, and the associated functional $ν: \mathcal{F} \rightarrow [0,1]$ mapping each such sequence to its Cesàro limit. The basic properties of $\mathcal{F}$ and $ν$ are enumerated, and chains (totally ordered sets) in $\mathcal{F}$ on which $ν$ is countably additive are studied in detail. The main result of the paper concerns a structural property of the pair $(\mathcal{F},ν)$, specifically that $\mathcal{F}$ can be factored (in a certain sense) to produce a monotone class on which $ν$ is countably additive. In the process, a slight generalisation and clarification of the monotone class theorem for Boolean algebras is proved.

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