Extending Fubini Measures

Lou van den Dries

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arXiv · 2512.22662

Extending Fubini Measures

Lou van den Dries

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Abstract

Let $C\subseteq M$ be stably embedded in a structure $\cM=(M;\dots)$. We consider {\em Fubini measures} on the subcategory $\Def(C)$ of the category $\Def(\cM)$ of definable sets in $\cM$, with ``Fubini" signaling good behaviour in definable families. We show that such a Fubini measure extends uniquely to the larger subcategory of $\Def(\cM)$ whose objects are the sets that are ``fiberable over $C$". In cases of interest ``fiberable over $C$" coincides with ``co-analyzable relative to $C$." This applies in particular to the differential field $\T$ of transseries with $C=\R$, and to differentially closed fields with constant field $C$.

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Lou van den Dries. 2025-12-27. Extending Fubini Measures. https://arxiv.org/abs/2512.22662

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