Abstract
We introduce a non-real-valued measure on the definable sets contained in the finite part of a cartesian power of an o-minimal field R. The measure takes values in an ordered semiring, the Dedekind completion of a quotient of R. We show that every measurable subset of R n with non-empty interior has positive measure, and that the measure is preserved by definable C 1-diffeomorphisms with Jacobian determinant equal to ±1.
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Maříková, J., Shiota, M. Measuring definable sets in o-minimal fields. Isr. J. Math. 209, 687–714 (2015). https://doi.org/10.1007/s11856-015-1234-0
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DOI: https://doi.org/10.1007/s11856-015-1234-0