Outer measure preserving ergodic transformations generate the Carathéodory definition of measurable sets

Details Outer measure preserving ergodic transformations generate the Carathéodory definition of measurable sets Outer measure preserving ergodic transformations generate the Carathéodory definition of measurable sets

2011-01-07

arxiv.org/abs/1101.1532v1

Mathematics

Functional Analysis

Scientific paper

It is known that there are specific examples of ergodic transformations on measure spaces for which the calculation of the outer measure of transformation invariant sets leads to a condition closely resembling Carath\'eodory's condition for sets to be measurable. It is then natural to ask what functions are capable of `generating', that is leading to, the Carath\'eodory definition in the same way. The present work answers this question by showing that the property of generating Carath\'eodory's definition holds for the general class of outer measure preserving ergodic transformations on measure spaces. We further show that the previously found specific examples of functions generating Carath\'eodory's definition fall into this family of transformations.

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