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Keywords:
order convergence; tight and $\tau$-smooth lattice-valued vector measures; measure representation of positive linear operators; Alexandrov’s theorem
Summary:
Let $X$ be a completely regular Hausdorff space, $E$ a boundedly complete vector lattice, $C_{b}(X)$ the space of all, bounded, real-valued continuous functions on $X$, $\mathcal{F}$ the algebra generated by the zero-sets of $X$, and $\mu \: C_{b}(X) \rightarrow E$ a positive linear map. First we give a new proof that $\mu$ extends to a unique, finitely additive measure $\mu \: \mathcal{F} \rightarrow E^{+}$ such that $\nu$ is inner regular by zero-sets and outer regular by cozero sets. Then some order-convergence theorems about nets of $E^{+}$-valued finitely additive measures on $\mathcal{F}$ are proved, which extend some known results. Also, under certain conditions, the well-known Alexandrov’s theorem about the convergent sequences of $\sigma$-additive measures is extended to the case of order convergence.
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