Abstract

A construction is given, using the standard part map st, of the weak ∗ {\text {weak}^\ast } standard part of an internal Baire measure in the nonstandard extension of a compact Hausdorff space. It is shown that the inverse image with respect to st of a Borel set is universally measurable with respect to completions of the σ \sigma -algebra generated by internal Baire sets. Applications and extensions of these results to noncompact spaces are given.

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